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Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
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1

Multilevel Inverters for Electric Vehicle Applications  

DOE Green Energy (OSTI)

This paper presents multilevel inverters as an application for all-electric vehicle (EV) and hybrid-electric vehicle (HEV) motor drives. Diode-clamped inverters and cascaded H-bridge inverters, (1) can generate near-sinusoidal voltages with only fundamental frequency switching; (2) have almost no electromagnetic interference (EMI) and common-mode voltage; and (3) make an EV more accessible/safer and open wiring possible for most of an EV'S power system. This paper explores the benefits and discusses control schemes of the cascade inverter for use as an EV motor drive or a parallel HEV drive and the diode-clamped inverter as a series HEV motor drive. Analytical, simulated, and experimental results show the superiority of these multilevel inverters for this new niche.

Habetler, T.G.; Peng, F.Z.; Tolbert, L.M.

1998-10-22T23:59:59.000Z

2

Multilevel Inverters for Electric Vehicle Applications  

SciTech Connect

This paper presents multilevel inverters as an application for all-electric vehicle (EV) and hybrid-electric vehicle (HEV) motor drives. Diode-clamped inverters and cascaded H-bridge inverters, (1) can generate near-sinusoidal voltages with only fundamental frequency switching; (2) have almost no electromagnetic interference (EMI) and common-mode voltage; and (3) make an EV more accessible/safer and open wiring possible for most of an EV'S power system. This paper explores the benefits and discusses control schemes of the cascade inverter for use as an EV motor drive or a parallel HEV drive and the diode-clamped inverter as a series HEV motor drive. Analytical, simulated, and experimental results show the superiority of these multilevel inverters for this new niche.

Habetler, T.G.; Peng, F.Z.; Tolbert, L.M.

1998-10-22T23:59:59.000Z

3

Power inverters  

DOE Patents (OSTI)

Power inverters include a frame and a power module. The frame has a sidewall including an opening and defining a fluid passageway. The power module is coupled to the frame over the opening and includes a substrate, die, and an encasement. The substrate includes a first side, a second side, a center, an outer periphery, and an outer edge, and the first side of the substrate comprises a first outer layer including a metal material. The die are positioned in the substrate center and are coupled to the substrate first side. The encasement is molded over the outer periphery on the substrate first side, the substrate second side, and the substrate outer edge and around the die. The encasement, coupled to the substrate, forms a seal with the metal material. The second side of the substrate is positioned to directly contact a fluid flowing through the fluid passageway.

Miller, David H. (Redondo Beach, CA); Korich, Mark D. (Chino Hills, CA); Smith, Gregory S. (Woodland Hills, CA)

2011-11-15T23:59:59.000Z

4

Inverter Controlled Screw Air Compressor Manufacturers ...  

U.S. Energy Information Administration (EIA)

Inverter Controlled Screw Air Compressor, Inverter Controlled Screw Air Compressor Manufacturers & Suppliers Directory - Find here Inverter ...

5

Invert Recommendations The Invert project  

E-Print Network (OSTI)

Energy Act: FITs guaranteed for 20 years. In more detail, FITs for new installations in 2003 are: Hydro, Tidal, Wave and Small Hydro, Regulation Energy Tax (REB) No United Kingdom TGC No Quota obligation of the European Commission, DG TREN Duration: May 2003 ­ April 2005 Co-ordination: - EEG - Energy Economics Group

6

Superconducting wire  

DOE Patents (OSTI)

This invention consists of a method of producing superconducting wire by drawing a glass fiber with a melted powder of a superconducting wire inside the glass tube. After drawing, the glass fiber is heated to crystallize the superconducting compound. The diameter of the superconducting wires is controlled by the rate at which the glass fiber s are drawn from the glass tube.

Day, D.E.; Petrovic, J.J.; Gac, F.D.; Ray, C.S.

1991-03-05T23:59:59.000Z

7

Developement of a digitally controlled low power single phase inverter for grid connected solar panel.  

E-Print Network (OSTI)

?? The work consists in developing a power conversion unit for solar panel connected to the grid. This unit will be a single phase inverter… (more)

Marguet, Raphael

2010-01-01T23:59:59.000Z

8

Wire chamber  

DOE Patents (OSTI)

A wire chamber or proportional counter device, such as Geiger-Mueller tube or drift chamber, improved with a gas mixture providing a stable drift velocity while eliminating wire aging caused by prior art gas mixtures. The new gas mixture is comprised of equal parts argon and ethane gas and having approximately 0.25% isopropyl alcohol vapor.

Atac, Muzaffer (Wheaton, IL)

1989-01-01T23:59:59.000Z

9

Resonant snubber inverter  

DOE Patents (OSTI)

A resonant, snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the main inverter switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter. 14 figs.

Lai, J.S.; Young, R.W. Sr.; Chen, D.; Scudiere, M.B.; Ott, G.W. Jr.; White, C.P.; McKeever, J.W.

1997-06-24T23:59:59.000Z

10

Resonant snubber inverter  

DOE Patents (OSTI)

A resonant, snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the main inverter switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter.

Lai, Jih-Sheng (Knoxville, TN); Young, Sr., Robert W. (Oak Ridge, TN); Chen, Daoshen (Knoxville, TN); Scudiere, Matthew B. (Oak Ridge, TN); Ott, Jr., George W. (Knoxville, TN); White, Clifford P. (Knoxville, TN); McKeever, John W. (Oak Ridge, TN)

1997-01-01T23:59:59.000Z

11

A delta configured auxiliary resonant snubber inverter  

SciTech Connect

A delta ({Delta}) configured auxiliary resonant snubber inverter is developed to overcome the voltage floating problem in a wye (Y) configured resonant snubber inverter. The proposed inverter is to connect auxiliary resonant branches between phase outputs to avoid a floating point voltage which may cause over-voltage failure of the auxiliary switches. Each auxiliary branch consists of a resonant inductor and a reverse blocking auxiliary switch. Instead of using an anti-paralleled diode to allow resonant current to flow in the reverse direction, as in the Y-configured version, the resonant branch in the {Delta}-configured version must block the negative voltage, typically done by a series diode. This paper shows single-phase and three-phase versions of {Delta}-configured resonant snubber inverters and describes in detail the operating principle of a single-phase version. The extended three-phase version is proposed with non-adjacent state space vector modulation. For hardware implementation, a single-phase 1-kW unit and a three-phase 100-kW unit were built to prove the concept. Experimental results show the superiority of the proposed topology.

Lai, J.S.; Young, R.W.; Ott, G.W. Jr.; McKeever, J.W. [Oak Ridge National Lab., TN (United States). Engineering Technology Div.; Peng, F.Z. [Univ. of Tennessee, Knoxville, TN (United States)]|[Oak Ridge National Lab., TN (United States)

1995-09-01T23:59:59.000Z

12

Invertible motion blur in video  

Science Conference Proceedings (OSTI)

We show that motion blur in successive video frames is invertible even if the point-spread function (PSF) due to motion smear in a single photo is non-invertible. Blurred photos exhibit nulls (zeros) in the frequency transform of the PSF, leading to ... Keywords: PSF, PSF estimation, computational photography, invertibility, motion deblurring

Amit Agrawal; Yi Xu; Ramesh Raskar

2009-07-01T23:59:59.000Z

13

Precision wire feeder for small diameter wire  

SciTech Connect

A device for feeding small diameter wire having a diameter less than 0.04 mm (16 mil) to a welding station includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut.

Brandon, Eldon D. (Albuquerque, NM); Hooper, Frederick M. (Albuquerque, NM); Reichenbach, Marvin L. (Albuquerque, NM)

1992-01-01T23:59:59.000Z

14

Precision wire feeder for small diameter wire  

DOE Patents (OSTI)

A device for feeding small diameter wire having a diameter less than 0.04 mm (16 mil) to a welding station includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut. 1 figure.

Brandon, E.D.; Hooper, F.M.; Reichenbach, M.L.

1992-08-11T23:59:59.000Z

15

Superconducting wires  

SciTech Connect

The requirement of high critical current density has prompted extensive research on ceramic processing of high-T/sub c/ superconductors. An overview of wire fabrication techniques and the limitations they impose on component design will be presented. The effects of processing on microstructure and critical current density will also be discussed. Particle alignment has been observed in extruded samples which is attributed to high shear stresses during plastic forming. Composites of superconductor and silver in several configurations have been made with little deleterious effect on the superconducting properties. 35 refs., 2 figs., 1 tab.

Lanagan, M.T.; Poeppel, R.B.; Singh, J.P.; Dos Santos, D.I.; Lumpp, J.K.; Dusek, J.T.; Goretta, K.C.

1988-06-01T23:59:59.000Z

16

Definition: Inverter | Open Energy Information  

Open Energy Info (EERE)

Inverter Inverter Jump to: navigation, search Dictionary.png Inverter A device that converts direct current electricity to alternating current either for stand-alone systems or to supply power to an electricity grid.[1] View on Wikipedia Wikipedia Definition A power inverter, or inverter, is an electrical power converter that changes direct current (DC) to alternating current (AC). The input voltage, output voltage, and frequency are dependent on design. Static inverters do not use moving parts in the conversion process. Some applications for inverters include converting high-voltage direct current electric utility line power to AC, and deriving AC from DC power sources such as batteries. Related Terms Direct current, Alternating current, Electric grid, Distributed generation, alternating current, electricity generation, power, fuel

17

Gemini Synchronous Inverter  

SciTech Connect

The Gemini Synchronous inverter is a solid state device that, when interposed between a variable-voltage DC power source and an AC power grid, converts the DC to AC at standard line voltages and frequencies. If more power is available from the DC source than is required by the load, the excess flows into the power grid. If less power is available than is required by the load the difference is provided by the power grid in the normal fashion.

Meyer, H.

1976-03-01T23:59:59.000Z

18

Smart Inverter Advanced Metering Infrastructure Integration Using Smart Energy Profile  

Science Conference Proceedings (OSTI)

Cost-effective integration of high penetrations of photovoltaic (PV) systems will require some level of communications and direct control of PV inverters. Approaches leveraging broadband and utility remote terminal units (RTU) are generally not scalable to smaller scale residential or small commercial inverters. Given the potential addition of many thousands of residential PV systems in the coming years, identifying a low-cost solution allowing control and communications with residential systems has ...

2013-08-15T23:59:59.000Z

19

Precision wire feeder for small diameter wire  

DOE Patents (OSTI)

This invention is comprised of a device for feeding small diameter wire having a diameter less than .04 mm (16 mil) to a welding station which includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut. 1 fig.

Brandon, E.D.; Hooper, F.M.; Reichenbach, M.L.

1990-12-31T23:59:59.000Z

20

An Updated Assessement of Copper Wire Thefts from Electric Utilities...  

NLE Websites -- All DOE Office Websites (Extended Search)

infrastructure in the United States. This report updates a previously published report on copper wire theft. The combined efforts of electric utilities, lawmakers, scrap metal...

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Inverters Unlimited Inc | Open Energy Information  

Open Energy Info (EERE)

Unlimited Inc Jump to: navigation, search Name Inverters Unlimited Inc Place New York Zip 12205 Sector Solar Product US-based manufacturer of solar inverters. References...

22

Field tests of a novel inverter for photovoltaic power conditioning  

SciTech Connect

The Dickerson inverter synthesizes a sinewave current from a photovoltaic array that is segmented into a number of subarrays. These subarrays are switched among the ac phases so that the current from a given subarray is continuous, and each phase is connected at all times to one or more subarrays. The control scheme assures a near-unity power factor current with real-time phase adjustment to power-system disturbances. A prototype inverter was operated into a three-phase power system, with the dc supplied by a photovoltaic array at Sandia National Laboratories. The results of these tests under normal, abnormal and fault conditions are reported. Inversion efficiencies up to 99% were achieved with 0.97 power factor. A simple filter reduced current harmonics from 18% to 5%. The performance for the inverter was projected for a 480-V, three-phase system at the 50-kVA level. An analysis of filtering costs indicates that harmonic reduction to 5% can be achieved at under $0.003 per watt for typical central-station applications. The intended power range for these inverters is 50--250 kVA. The cost to produce the inverter at the 50-kVA level in quantities of 1000 units is estimated to be $0.05 per watt, which is less than the projected cost of other 50-kVA inverters. 22 figs., 9 tabs.

Dickerson, A.; Bower, W.; Schalles, F.

1989-05-01T23:59:59.000Z

23

Precision Wire Forming  

SciTech Connect

An air-operated semiautomatic wire former was designed and built at Mound Laboratory to form specific types of electrodes to be molded in plastic parts. Use of the semiautomatic wire former eliminates the sliding action of tooling on the surface of the electrode wire to be formed and properly aligns the crimped electrode surfaces to within required tolerance ranges. These are difficulties which are characteristic of conventional wire forming tooling. Interchangeable tooling is provided with the semiautomatic wire former for forming electrode wires in one plane; secondary tooling was designed and bulit for forming electrode wires in two planes; and a special series of tooling was designed for forming more complex wire forms.

Weeks, J. E.; Osborne, J. M.

1970-08-07T23:59:59.000Z

24

Integration of Xantrex HY-100 Hybrid Inverter with an AC Induction Wind Turbine  

SciTech Connect

Several issues must be addressed before solid-state inverters can be used in wind-diesel systems with larger wind turbines. This project addresses those issues by using a commercial hybrid inverter designed for PV-diesel systems and modifying the inverter for use with an AC induction wind turbine. Another approach would have entailed building an inverter specifically for use with an AC induction wind turbine, but that was beyond the scope of this project. The inverter chosen for this project was a Xantrex HY-100, an inverter designed for PV systems. The unit consists of an inverter/rectifier bridge, a generator interface contactor, a battery charge controller, a hybrid controller, and the associated control electronics. Details of the inverter may be found in Appendix A. A twofold approach was taken to integrating the existing inverter for use with an AC induction wind turbine: 1) development of a detailed model to model both steady-state and transient behavior of the system, and 2) modification and testing of the inverter with an induction wind turbine based on the modeling results. This report describes these two tasks.

Corbus, D.; Newcomb, C.; Friedly, S.

2003-05-01T23:59:59.000Z

25

Breaking Barriers to Low-Cost Modular Inverter Production & Use  

DOE Green Energy (OSTI)

The goal of this cost share contract is to advance key technologies to reduce size, weight and cost while enhancing performance and reliability of Modular Inverter Product for Distributed Energy Resources (DER). Efforts address technology development to meet technical needs of DER market protection, isolation, reliability, and quality. Program activities build on SatCon Technology Corporation inverter experience (e.g., AIPM, Starsine, PowerGate) for Photovoltaic, Fuel Cell, Energy Storage applications. Efforts focused four technical areas, Capacitors, Cooling, Voltage Sensing and Control of Parallel Inverters. Capacitor efforts developed a hybrid capacitor approach for conditioning SatCon's AIPM unit supply voltages by incorporating several types and sizes to store energy and filter at high, medium and low frequencies while minimizing parasitics (ESR and ESL). Cooling efforts converted the liquid cooled AIPM module to an air-cooled unit using augmented fin, impingement flow cooling. Voltage sensing efforts successfully modified the existing AIPM sensor board to allow several, application dependent configurations and enabling voltage sensor galvanic isolation. Parallel inverter control efforts realized a reliable technique to control individual inverters, connected in a parallel configuration, without a communication link. Individual inverter currents, AC and DC, were balanced in the paralleled modules by introducing a delay to the individual PWM gate pulses. The load current sharing is robust and independent of load types (i.e., linear and nonlinear, resistive and/or inductive). It is a simple yet powerful method for paralleling both individual devices dramatically improves reliability and fault tolerance of parallel inverter power systems. A patent application has been made based on this control technology.

Bogdan Borowy; Leo Casey; Jerry Foshage; Steve Nichols; Jim Perkinson

2005-05-31T23:59:59.000Z

26

Breaking Barriers to Low-Cost Modular Inverter Production & Use  

SciTech Connect

The goal of this cost share contract is to advance key technologies to reduce size, weight and cost while enhancing performance and reliability of Modular Inverter Product for Distributed Energy Resources (DER). Efforts address technology development to meet technical needs of DER market protection, isolation, reliability, and quality. Program activities build on SatCon Technology Corporation inverter experience (e.g., AIPM, Starsine, PowerGate) for Photovoltaic, Fuel Cell, Energy Storage applications. Efforts focused four technical areas, Capacitors, Cooling, Voltage Sensing and Control of Parallel Inverters. Capacitor efforts developed a hybrid capacitor approach for conditioning SatCon's AIPM unit supply voltages by incorporating several types and sizes to store energy and filter at high, medium and low frequencies while minimizing parasitics (ESR and ESL). Cooling efforts converted the liquid cooled AIPM module to an air-cooled unit using augmented fin, impingement flow cooling. Voltage sensing efforts successfully modified the existing AIPM sensor board to allow several, application dependent configurations and enabling voltage sensor galvanic isolation. Parallel inverter control efforts realized a reliable technique to control individual inverters, connected in a parallel configuration, without a communication link. Individual inverter currents, AC and DC, were balanced in the paralleled modules by introducing a delay to the individual PWM gate pulses. The load current sharing is robust and independent of load types (i.e., linear and nonlinear, resistive and/or inductive). It is a simple yet powerful method for paralleling both individual devices dramatically improves reliability and fault tolerance of parallel inverter power systems. A patent application has been made based on this control technology.

Bogdan Borowy; Leo Casey; Jerry Foshage; Steve Nichols; Jim Perkinson

2005-05-31T23:59:59.000Z

27

Inverted Attic Bulkhead for HVAC Ductwork | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Inverted Attic Bulkhead for HVAC Ductwork Inverted Attic Bulkhead for HVAC Ductwork Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California (Fact Sheet), Building America...

28

Advanced Modular Inverter Technology Development  

DOE Green Energy (OSTI)

Electric and hybrid-electric vehicle systems require an inverter to convert the direct current (DC) output of the energy generation/storage system (engine, fuel cells, or batteries) to the alternating current (AC) that vehicle propulsion motors use. Vehicle support systems, such as lights and air conditioning, also use the inverter AC output. Distributed energy systems require an inverter to provide the high quality AC output that energy system customers demand. Today's inverters are expensive due to the cost of the power electronics components, and system designers must also tailor the inverter for individual applications. Thus, the benefits of mass production are not available, resulting in high initial procurement costs as well as high inverter maintenance and repair costs. Electricore, Inc. (www.electricore.org) a public good 501 (c) (3) not-for-profit advanced technology development consortium assembled a highly qualified team consisting of AeroVironment Inc. (www.aerovironment.com) and Delphi Automotive Systems LLC (Delphi), (www.delphi.com), as equal tiered technical leads, to develop an advanced, modular construction, inverter packaging technology that will offer a 30% cost reduction over conventional designs adding to the development of energy conversion technologies for crosscutting applications in the building, industry, transportation, and utility sectors. The proposed inverter allows for a reduction of weight and size of power electronics in the above-mentioned sectors and is scalable over the range of 15 to 500kW. The main objective of this program was to optimize existing AeroVironment inverter technology to improve power density, reliability and producibility as well as develop new topology to reduce line filter size. The newly developed inverter design will be used in automotive and distribution generation applications. In the first part of this program the high-density power stages were redesigned, optimized and fabricated. One of the main tasks was to design and validate new gate drive circuits to provide the capability of high temp operation. The new power stages and controls were later validated through extensive performance, durability and environmental tests. To further validate the design, two power stages and controls were integrated into a grid-tied load bank test fixture, a real application for field-testing. This fixture was designed to test motor drives with PWM output up to 50kW. In the second part of this program the new control topology based on sub-phases control and interphase transformer technology was successfully developed and validated. The main advantage of this technology is to reduce magnetic mass, loss and current ripple. This report summarizes the results of the advanced modular inverter technology development and details: (1) Power stage development and fabrication (2) Power stage validation testing (3) Grid-tied test fixture fabrication and initial testing (4) Interphase transformer technology development

Adam Szczepanek

2006-02-04T23:59:59.000Z

29

Advanced Modular Inverter Technology Development  

SciTech Connect

Electric and hybrid-electric vehicle systems require an inverter to convert the direct current (DC) output of the energy generation/storage system (engine, fuel cells, or batteries) to the alternating current (AC) that vehicle propulsion motors use. Vehicle support systems, such as lights and air conditioning, also use the inverter AC output. Distributed energy systems require an inverter to provide the high quality AC output that energy system customers demand. Today's inverters are expensive due to the cost of the power electronics components, and system designers must also tailor the inverter for individual applications. Thus, the benefits of mass production are not available, resulting in high initial procurement costs as well as high inverter maintenance and repair costs. Electricore, Inc. (www.electricore.org) a public good 501 (c) (3) not-for-profit advanced technology development consortium assembled a highly qualified team consisting of AeroVironment Inc. (www.aerovironment.com) and Delphi Automotive Systems LLC (Delphi), (www.delphi.com), as equal tiered technical leads, to develop an advanced, modular construction, inverter packaging technology that will offer a 30% cost reduction over conventional designs adding to the development of energy conversion technologies for crosscutting applications in the building, industry, transportation, and utility sectors. The proposed inverter allows for a reduction of weight and size of power electronics in the above-mentioned sectors and is scalable over the range of 15 to 500kW. The main objective of this program was to optimize existing AeroVironment inverter technology to improve power density, reliability and producibility as well as develop new topology to reduce line filter size. The newly developed inverter design will be used in automotive and distribution generation applications. In the first part of this program the high-density power stages were redesigned, optimized and fabricated. One of the main tasks was to design and validate new gate drive circuits to provide the capability of high temp operation. The new power stages and controls were later validated through extensive performance, durability and environmental tests. To further validate the design, two power stages and controls were integrated into a grid-tied load bank test fixture, a real application for field-testing. This fixture was designed to test motor drives with PWM output up to 50kW. In the second part of this program the new control topology based on sub-phases control and interphase transformer technology was successfully developed and validated. The main advantage of this technology is to reduce magnetic mass, loss and current ripple. This report summarizes the results of the advanced modular inverter technology development and details: (1) Power stage development and fabrication (2) Power stage validation testing (3) Grid-tied test fixture fabrication and initial testing (4) Interphase transformer technology development

Adam Szczepanek

2006-02-04T23:59:59.000Z

30

Wire-inhomogeneity detector  

DOE Patents (OSTI)

A device for uncovering imperfections in electrical conducting wire, particularly superconducting wire, by detecting variations in eddy currents. Eddy currents effect the magnetic field in a gap of an inductor, contained in a modified commercial ferrite core, through which the wire being tested is passed. A small increase or decrease in the amount of conductive material, such as copper, in a fixed cross section of wire will unbalance a bridge used to measure the impedance of the inductor, tripping a detector and sounding an alarm.

Gibson, G.H.; Smits, R.G.; Eberhard, P.H.

1982-08-31T23:59:59.000Z

31

Update on SIC-Based Inverter Technology  

SciTech Connect

This paper presents a study of silicon carbide (SiC) technology which includes device characterization and modeling, inverter simulation, and test results for several prototype inverters. The static and dynamic characteristics of discrete devices and half bridge modules are presented. Test results of a 55 kW hybrid inverter with SiC Schottky diodes and an 18 kW all-SiC inverter using SiC JFETs and Schottky diodes are demonstrated.

Chinthavali, Madhu Sudhan [ORNL; Zhang, Hui [ORNL; Tolbert, Leon M [ORNL; Ozpineci, Burak [ORNL

2009-01-01T23:59:59.000Z

32

Thermal Study of Inverter Components: Preprint  

DOE Green Energy (OSTI)

Thermal histories of inverter components were collected from operating inverters from several manufacturers and three locations. The data were analyzed to determine thermal profiles, the dependence on local conditions, and to assess the effect on inverter reliability. Inverter temperatures were shown to increase with the power dissipation of the inverters, follow diurnal and annual cycles, and have a dependence on wind speed. An accumulated damage model was applied to the temperature profiles and an example of using these data to predict reliability was explored.

Sorensen, N. R.; Thomas, E. V.; Quintana, M. A.; Barkaszi, S.; Rosenthal, A.; Zhang, Z.; Kurtz, S.

2012-06-01T23:59:59.000Z

33

Effective switching frequency multiplier inverter  

SciTech Connect

A switching frequency multiplier inverter for low inductance machines that uses parallel connection of switches and each switch is independently controlled according to a pulse width modulation scheme. The effective switching frequency is multiplied by the number of switches connected in parallel while each individual switch operates within its limit of switching frequency. This technique can also be used for other power converters such as DC/DC, AC/DC converters.

Su, Gui-Jia (Oak Ridge, TN); Peng, Fang Z. (Okemos, MI)

2007-08-07T23:59:59.000Z

34

Wire-driven Parallel Robot: Permitting Collisions Between Wires  

Science Conference Proceedings (OSTI)

In spatial designs of wire-driven parallel robots, collisions between wires by limiting platform trajectories. The common practice for avoiding collisions between wires is by limiting the moving platform trajectories. However, as opposed to rigid ... Keywords: cable robot, collision, tangling, wire robot, workspace

Yonatan Wischnitzer; Nir Shvalb; Moshe Shoham

2008-09-01T23:59:59.000Z

35

System and method for regulating resonant inverters  

SciTech Connect

A technique is provided for direct digital phase control of resonant inverters based on sensing of one or more parameters of the resonant inverter. The resonant inverter control system includes a switching circuit for applying power signals to the resonant inverter and a sensor for sensing one or more parameters of the resonant inverter. The one or more parameters are representative of a phase angle. The resonant inverter control system also includes a comparator for comparing the one or more parameters to a reference value and a digital controller for determining timing of the one or more parameters and for regulating operation of the switching circuit based upon the timing of the one or more parameters.

Stevanovic, Ljubisa Dragoljub (Clifton Park, NY); Zane, Regan Andrew (Superior, CO)

2007-08-28T23:59:59.000Z

36

Shared inverter residential photovoltaic system concept  

SciTech Connect

A residential photovoltaic system concept involving a number of separate roof-mounted arrays all connected to a single utility-interactive inverter is proposed and analyzed in comparison to systems employing one inverter for each array. The conclusion of significance is that such shared inverter systems offer a costs savings of approximately 10 percent. It is observed that other substantial benefits might derive from a reduction in the number of tie-in points between distributed generators and the electric utility grid.

Kern, E.C.; Solman, F.J.

1981-11-01T23:59:59.000Z

37

Integrated Inverter Control for Multiple Electric Machines ...  

Wind Energy; Partners (27 ... control for directing multiple inverters with a single ... 57, 62), which may include a three-phase main ...

38

Cascade Multilevel Inverters for Utility Applications  

SciTech Connect

Cascade multilevel inverters have been developed by the authors for utility applications. A cascade M-level inverter consists of (M-1)/2 H- bridges in which each bridge has its own separate dc source. The new inverter: (1) can generate almost sinusoidal waveform voltage while only switching one time per fundamental cycle, (2) can eliminate transformers of multipulse inverters used in conventional utility interfaces and static var compensators, and (3) makes possible direct parallel or series connection to medium- and high-voltage power systems without any transformers. In other words, the cascade inverter is much more efficient and suitable for utility applications than traditional multipulse and pulse width modulation (PWM) inverters. The authors have experimentally demonstrated the superiority of the new inverter for reactive power (var) and harmonic compensation. This paper will summarize features,feasibility, and control schemes of the cascade inverter for utility applications including utility interface of renewable energy, voltage regulation, var compensation, and harmonic filtering in power systems.Analytical, simulated, and experimental results demonstrate the superiority of the new inverters.

Peng, F.Z., McKeever, J.W., Adams, D.J.

1997-12-31T23:59:59.000Z

39

Enhanced Diffusional Processes in Wire Bonding  

Science Conference Proceedings (OSTI)

Presentation Title, Enhanced Diffusional Processes in Wire Bonding ... there is a tremendous need for implementation of thinner wires in wire boning processes.

40

Wire brush fastening device  

DOE Patents (OSTI)

A fastening device is provided which is a variation on the conventional nut and bolt. The bolt has a longitudinal axis and threading helically affixed thereon along the longitudinal axis. A nut having a bore extending therethrough is provided. The bore of the nut has a greater diameter than the diameter of the bolt so the bolt can extend through the bore. An array of wire bristles are affixed within the bore so as to form a brush. The wire bristles extend inwardly from the bore and are constructed and arranged of the correct size, length and stiffness to guide the bolt within the bore and to restrain the bolt within the bore as required. A variety of applications of the wire brush nut are disclosed, including a bolt capture device and a test rig apparatus.

Meigs, Richard A. (East Concord, NY)

1995-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Wire brush fastening device  

DOE Patents (OSTI)

A fastening device is provided which is a variation on the conventional nut and bolt. The bolt has a longitudinal axis and threading helically affixed thereon along the longitudinal axis. A nut having a bore extending therethrough is provided. The bore of the nut has a greater diameter than the diameter of the bolt so the bolt can extend through the bore. An array of wire bristles are affixed within the bore so as to form a brush. The wire bristles extend inwardly from the bore and are constructed and arranged of the correct size, length and stiffness to guide the bolt within the bore and to restrain the bolt within the bore as required. A variety of applications of the wire brush nut are disclosed, including a bolt capture device and a test rig apparatus.

Meigs, R.A.

1993-08-31T23:59:59.000Z

42

Wire brush fastening device  

DOE Patents (OSTI)

A fastening device is provided which is a variation on the conventional nut and bolt. The bolt has a longitudinal axis and threading helically affixed thereon along the longitudinal axis. A nut having a bore extending therethrough is provided. The bore of the nut has a greater diameter than the diameter of the bolt so the bolt can extend through the bore. An array of wire bristles are affixed within the bore so as to form a brush. The wire bristles extend inwardly from the bore and are constructed and arranged of the correct size, length and stiffness to guide the bolt within the bore and to restrain the bolt within the bore as required. A variety of applications of the wire brush nut are disclosed, including a bolt capture device and a test rig apparatus. 13 figs.

Meigs, R.A.

1995-09-19T23:59:59.000Z

43

An Investigation of Wire Breaks Created during Copper Wire ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2010. Symposium, Failure Analysis and Prevention. Presentation Title, An Investigation of Wire ...

44

Invert Effective Thermal Conductivity Calculation  

SciTech Connect

The objective of this calculation is to evaluate the temperature-dependent effective thermal conductivities of a repository-emplaced invert steel set and surrounding ballast material. The scope of this calculation analyzes a ballast-material thermal conductivity range of 0.10 to 0.70 W/m {center_dot} K, a transverse beam spacing range of 0.75 to 1.50 meters, and beam compositions of A 516 carbon steel and plain carbon steel. Results from this calculation are intended to support calculations that identify waste package and repository thermal characteristics for Site Recommendation (SR). This calculation was developed by Waste Package Department (WPD) under Office of Civilian Radioactive Waste Management (OCRWM) procedure AP-3.12Q, Revision 1, ICN 0, Calculations.

M.J. Anderson; H.M. Wade; T.L. Mitchell

2000-03-17T23:59:59.000Z

45

Improved wire chamber  

DOE Patents (OSTI)

An improved gas mixture for use with proportional counter devices, such as Geiger-Mueller tubes and drift chambers. The improved gas mixture provides a stable drift velocity while eliminating wire aging caused by prior art gas mixtures. The new gas mixture is comprised of equal parts argon and ethane gas and having approximately 0.25% isopropyl alcohol vapor. 2 figs.

Atac, M.

1987-05-12T23:59:59.000Z

46

Interim Project Results: United Parcel Service's Second-Generation...  

NLE Websites -- All DOE Office Websites (Extended Search)

Application for Each Engine and Truck Manufacturer Hybrid Drive Unit Transmission InverterControls Partners Brakes (ABS) Eaton Hybrid Electric System UPS' hybrid-electric...

47

Wire Bonder: Kulicke and Soffa Model 4526  

Science Conference Proceedings (OSTI)

Wire Bonder: Kulicke and Soffa Model 4526. Description: CORAL Name: Wire Bonder. Needs Description. Scientific Opportunities / Applications: ...

2013-05-23T23:59:59.000Z

48

Wire rope superconducting cable for diurnal load leveling SMES  

DOE Green Energy (OSTI)

The design of a wire rope cable for a superconducting magnetic energy storage (SMES) unit is discussed. The superconducting wires in the rope permit the passage of large currents in the relatively small conductors of the windings and hence cause large electromagnetic forces to act on the rope. The diameter of the rope, from a strength point of view, can be considerably reduced by supporting the rope at various points along its length.

Costello, G.A.

1980-01-01T23:59:59.000Z

49

Superconducting magnet wire  

DOE Patents (OSTI)

A superconducting tape or wire with an improved critical field is formed of alternating layers of a niobium-containing superconductor such as Nb, NbTi, Nb.sub.3 Sn or Nb.sub.3 Ge with a thickness in the range of about 0.5-1.5 times its coherence length, supported and separated by layers of copper with each copper layer having a thickness in the range of about 170-600 .ANG..

Schuller, Ivan K. (Woodridge, IL); Ketterson, John B. (Evanston, IL); Banerjee, Indrajit (San Jose, CA)

1986-01-01T23:59:59.000Z

50

Multigrid Solution of the Semigeostrophic Invertibility Relation  

Science Conference Proceedings (OSTI)

In semigeostrophic theory one can recover the balanced wind and mass fields from the potential vorticity by solving a nonlinear elliptic boundary-value problem. This paper describes the efficient solution of this invertibility relation in two ...

Scott R. Fulton

1989-09-01T23:59:59.000Z

51

Integrated Inverter For Driving Multiple Electric Machines  

DOE Patents (OSTI)

An electric machine drive (50) has a plurality of inverters (50a, 50b) for controlling respective electric machines (57, 62), which may include a three-phase main traction machine (57) and two-phase accessory machines (62) in a hybrid or electric vehicle. The drive (50) has a common control section (53, 54) for controlling the plurality of inverters (50a, 50b) with only one microelectronic processor (54) for controlling the plurality of inverters (50a, 50b), only one gate driver circuit (53) for controlling conduction of semiconductor switches (S1-S10) in the plurality of inverters (50a, 50b), and also includes a common dc bus (70), a common dc bus filtering capacitor (C1) and a common dc bus voltage sensor (67). The electric machines (57, 62) may be synchronous machines, induction machines, or PM machines and may be operated in a motoring mode or a generating mode.

Su, Gui-Jia [Knoxville, TN; Hsu, John S [Oak Ridge, TN

2006-04-04T23:59:59.000Z

52

Removing Barriers to Utility Interconnected Photovoltaic Inverters  

SciTech Connect

The Million Solar Roofs Initiative has motivated a renewed interest in the development of utility interconnected photovoltaic (UIPV) inverters. Government-sponsored programs (PVMaT, PVBONUS) and competition among utility interconnected inverter manufacturers have stimulated innovations and improved the performance of existing technologies. With this resurgence, Sandia National Laboratories (SNL) has developed a program to assist industry initiatives to overcome barriers to UIPV inverters. In accordance with newly adopted IEEE 929-2000, the utility interconnected PV inverters are required to cease energizing the utility grid when either a significant disturbance occurs or the utility experiences an interruption in service. Compliance with IEEE 929-2000 is being widely adopted by utilities as a minimum requirement for utility interconnection. This report summarizes work done at the SNL balance-of-systems laboratory to support the development of IEEE 929-2000 and to assist manufacturers in meeting its requirements.

Gonzalez, S.; Bonn, R.H.; Ginn, J.W.

2000-10-03T23:59:59.000Z

53

Proof of feasibility of a novel inverter for photovoltaic power conditioning  

SciTech Connect

The Dickerson inverter concept obtains a sinewave current from an array that is segmented into a number of subarrays. These subarrays are switched among the ac phases so that the current from a given subarray is continuous and each phase is connected at all times to one or more subarrays. The control scheme assures a unity power factor currrent with real-time adjustment to power-system disturbances. A proof-of-concept inverter has been operated into a three-phase power system, with the dc supplied from a motor-generator set plus regulators that closely simulated the current-voltage characteristics of a photovoltaic array. The performance for the inverter has been projected for a 480V, three-phase system at the 50 kVA level. Computer simulations showed 98% utilization of array power was possible with efficiency better than 98% and harmonic content of 18% without filtering. An analysis of filtering costs indicates that reduction to 5% can be achieved at under $0.003 per watt for typical central-station applications. A more complex configuration was also analyzed with results of 99% utilization, 8% harmonic content, and the same efficiency. The intended power range for these inverters is 50 to 250 kVA per unit. The cost to produce the inverter at the 50 kVA level in quantities of 1000 units is estimated to be $0.05 per watt.

Dickerson, A.

1986-04-01T23:59:59.000Z

54

Dual wire welding torch and method  

SciTech Connect

A welding torch includes a nozzle with a first welding wire guide configured to orient a first welding wire in a first welding wire orientation, and a second welding wire guide configured to orient a second welding wire in a second welding wire orientation that is non-coplanar and divergent with respect to the first welding wire orientation. A method of welding includes moving a welding torch with respect to a workpiece joint to be welded. During moving the welding torch, a first welding wire is fed through a first welding wire guide defining a first welding wire orientation and a second welding wire is fed through a second welding wire guide defining a second welding wire orientation that is divergent and non-coplanar with respect to the first welding wire orientation.

Diez, Fernando Martinez (Peoria, IL); Stump, Kevin S. (Sherman, IL); Ludewig, Howard W. (Groveland, IL); Kilty, Alan L. (Peoria, IL); Robinson, Matthew M. (Peoria, IL); Egland, Keith M. (Peoria, IL)

2009-04-28T23:59:59.000Z

55

Wire detecting apparatus and method  

DOE Patents (OSTI)

This invention is comprised of an apparatus and method that combines a signal generator and a passive signal receiver to detect and record the path of partially or completely concealed electrical wiring without disturbing the concealing surface. The signal generator applies a series of electrical pulses to the selected wiring of interest. The applied pulses create a magnetic field about the wiring that can be detected by a coil contained within the signal receiver. An audible output connected to the receiver and driven by the coil reflects the receiver`s position with respect to the wiring. The receiver`s audible signal is strongest when the receiver is directly above the wiring and the long axis of the receiver`s coil is parallel to the wiring. A marking means is mounted on the receiver to mark the location of the wiring as the receiver is directed over the wiring`s concealing surface. Numerous marks made on various locations of the concealing surface will trace the path of the wiring of interest.

Kronberg, J.W.

1991-12-31T23:59:59.000Z

56

An Updated Assessement of Copper Wire Thefts from Electric Utilities -  

NLE Websites -- All DOE Office Websites (Extended Search)

An Updated Assessement of Copper Wire Thefts from Electric An Updated Assessement of Copper Wire Thefts from Electric Utilities - October 2010 An Updated Assessement of Copper Wire Thefts from Electric Utilities - October 2010 The U.S. Department of Energy (DOE), Office of Electricity Delivery and Energy Reliability monitors changes, threats, and risks to the energy infrastructure in the United States. This report updates a previously published report on copper wire theft. The combined efforts of electric utilities, lawmakers, scrap metal dealers, and local law enforcement have succeeded in reducing the problem. Updated Assessment-Copper-Final October 2010.pdf More Documents & Publications Investigation Letter Report: I11IG002 Semiannual Report to Congress: for the first half of Fiscal Year (FY) 1998 Energy Infrastructure Events and Expansions Year-in-Review 2010

57

Glass Drawing for Wire Arrays  

The size of the wafer is limited only by how much fiber is bundled prior to fusion. Since the wire is not actually being drawn, ...

58

high strength steel wire products  

Science Conference Proceedings (OSTI)

This Table of Contents is from Metallurgy, Processing, and Applications of Metal Wires--State of the Art Technology and Challenges for the Future published by ...

59

EMPLACEMENT DRIFT INVERT-LOW STEEL EVALUATION  

SciTech Connect

This technical report evaluates and develops options for reducing the amount of steel in the emplacement drift invert. Concepts developed in the ''Invert Configuration and Drip Shield Interface'' were evaluated to determine material properties required for the proposed invert concepts. Project requirements documents prescribe the use of a carbon steel frame for the invert with a granular material of crushed tuff as ballast. The ''Invert Configuration and Drip Shield Interface'' developed three concepts: (1) All-Ballast Invert; (2) Modified Steel Invert with Ballast; and (3) Steel Tie with Ballast Invert. Analysis of the steel frame members, runway beams, and guide beams, for the modified steel invert with ballast, decreased the quantity of steel in the emplacement drift invert, however a substantial steel support frame for the gantry and waste package/pallet assembly is still required. Use of one of the other two concepts appears to be an alternative to the steel frame and each of the concepts uses considerably less steel materials. Analysis of the steel tie with ballast invert shows that the bearing pressure on the ballast under the single steel tie, C 9 x 20, loaded with the waste package/pallet assembly, drip shield, and backfill exceeds the upper bound of the allowable bearing capacity for tuff used in this study. The single tie, C 10 x 20, will also fail for the same loading condition except for the tie length of 4.2 meters and longer. Analysis also shows that with two ties, C 9 or 10 x 20's, the average ballast pressure is less than the allowable bearing capacity. Distributing the waste package/pallet, drip shield, and backfill loads to two steel ties reduces the contact bearing pressure. Modifying the emplacement pallet end beams to a greater width, reducing the tie spacing, and increasing the width of the ties would ensure that the pallet beams are always supported by two steel ties. Further analysis is required to determine compatible tie size and spacing and pallet beam width. Testing is also required to determine the bearing capacity of the tuff materials. Analysis of the all-ballast invert shows that the waste package/pallet assembly, as currently designed, can be supported by the compacted crushed tuff. The drip shield and related backfill loads cannot be supported by the compacted crushed tuff because of the narrow base angle that currently supports the drip shield. Increasing the width of the base angle of the drip shield will better distribute the drip shield and backfill load to the compacted crushed tuff. Testing is required to determine the bearing capacity of the tuff materials. Emplacement/retrieval equipment will also require analysis and development to be compatible with the all-ballast invert.

M. E. Taylor and D. H. Tang

2000-09-29T23:59:59.000Z

60

Improved superconducting magnet wire  

DOE Patents (OSTI)

This invention is directed to a superconducting tape or wire composed of alternating layers of copper and a niobium-containing superconductor such as niobium of NbTi, Nb/sub 3/Sn or Nb/sub 3/Ge. In general, each layer of the niobium-containing superconductor has a thickness in the range of about 0.05 to 1.5 times its coherence length (which for Nb/sub 3/Si is 41 A) with each copper layer having a thickness in the range of about 170 to 600 A. With the use of very thin layers of the niobium composition having a thickness within the desired range, the critical field (H/sub c/) may be increased by factors of 2 to 4. Also, the thin layers of the superconductor permit the resulting tape or wire to exhibit suitable ductility for winding on a magnet core. These compositions are also characterized by relatively high values of critical temperature and therefore will exhibit a combination of useful properties as superconductors.

Schuller, I.K.; Ketterson, J.B.

1983-08-16T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Definition: Controllable and Regulating Inverter | Open Energy Information  

Open Energy Info (EERE)

Controllable and Regulating Inverter Controllable and Regulating Inverter Jump to: navigation, search Dictionary.png Controllable and Regulating Inverter Inverters are used to convert Direct Current (DC), the form of electricity produced by solar panels and batteries, to Alternating Current (AC), the form of electricity that comes from most wall plugs. A controllable/regulating inverter can adjust its output to help control voltage and power factor, enabling it to provide grid support. This is important because today, inverter standards are designed to prevent inverters from trying to regulate power beyond the point where they are connected to the grid.[1] Related Terms Direct Current, Alternating Current, electricity generation, inverter References ↑ https://www.smartgrid.gov/category/technology/controllable_and_regulating_inverter

62

Japanese power electronics inverter technology and its impact on the American air conditioning industry  

SciTech Connect

Since 1983, technological advances and market growth of inverter- driven variable-speed heat pumps in Japan have been dramatic. The high level of market penetration was promoted by a combination of political, economic, and trade policies in Japan. A unique environment was created in which the leading domestic industries-- microprocessor manufacturing, compressors for air conditioning and refrigerators, and power electronic devices--were able to direct the development and market success of inverter-driven heat pumps. As a result, leading US variable-speed heat pump manufacturers should expect a challenge from the Japanese producers of power devices and microprocessors. Because of the vertically-integrated production structure in Japan, in contrast to the out-sourcing culture of the United States, price competition at the component level (such as inverters, sensors, and controls) may impact the structure of the industry more severely than final product sales. 54 refs., 47 figs., 1 tab.

Ushimaru, Kenji.

1990-08-01T23:59:59.000Z

63

Torpedo Speciality Wire Inc | Open Energy Information  

Open Energy Info (EERE)

Torpedo Speciality Wire Inc Jump to: navigation, search Name Torpedo Speciality Wire Inc Place Rocky Mount, North Carolina Zip 27804 Sector Solar Product North Carolina-based maker...

64

Ignition and spread of electrical wire fires  

E-Print Network (OSTI)

pilot source, placed in the center of the wire sample to initiate ignition, which heats the wire through both convection (major) and radiation (

Huang, Xinyan

2012-01-01T23:59:59.000Z

65

Diamond Wire Technology LLC | Open Energy Information  

Open Energy Info (EERE)

Wire Technology LLC Jump to: navigation, search Name Diamond Wire Technology LLC Place Colorado Springs, Colorado Zip 80916 Sector Solar Product US-based manufacturer of diamond...

66

Using Cascade Multilevel Inverters Fang Zheng Peng, Senior Member...  

Office of Scientific and Technical Information (OSTI)

power flows into the inverter for positive Icd and out from the inverter for negative led. The SVG generates leading reactive power when IC, is positive and lagging reactive...

67

Plasma chemistry in wire chambers  

SciTech Connect

The phenomenology of wire chamber aging is discussed and fundamentals of proportional counters are presented. Free-radical polymerization and plasma polymerization are discussed. The chemistry of wire aging is reviewed. Similarities between wire chamber plasma (>1 atm dc-discharge) and low-pressure rf-discharge plasmas, which have been more widely studied, are suggested. Construction and use of a system to allow study of the plasma reactions occurring in wire chambers is reported. A proportional tube irradiated by an {sup 55}Fe source is used as a model wire chamber. Condensable species in the proportional tube effluent are concentrated in a cryotrap and analyzed by gas chromatography/mass spectrometry. Several different wire chamber gases (methane, argon/methane, ethane, argon/ethane, propane, argon/isobutane) are tested and their reaction products qualitatively identified. For all gases tested except those containing methane, use of hygroscopic filters to remove trace water and oxygen contaminants from the gas resulted in an increase in the average molecular weight of the products, consistent with results from low-pressure rf-discharge plasmas. It is suggested that because water and oxygen inhibit polymer growth in the gas phase that they may also reduce polymer deposition in proportional tubes and therefore retard wire aging processes. Mechanistic implications of the plasma reactions of hydrocarbons with oxygen are suggested. Unresolved issues in this work and proposals for further study are discussed.

Wise, J.

1990-05-01T23:59:59.000Z

68

Charge Controller and Inverter: for Solar Panel  

Science Conference Proceedings (OSTI)

The main purpose of this project is to design an inverter that will enable the inversion of a DC power source, supplied by Photovoltaic (PV) Cells, to an AC power source that will be either used to supply a load or connected directly to the utility grid. ...

Hadaate Ullah; Golam Moktader Nayeem; Mohammad Arif Sobhan Bhuiyan

2012-03-01T23:59:59.000Z

69

Pulse width modulation inverter with battery charger  

SciTech Connect

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a microprocessor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin [theta], where [theta] is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120[degree] at the stator frequency. Switching control commands for electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a flyback'' DC-DC converter circuit for recharging the battery. 11 figs.

Slicker, J.M.

1985-01-01T23:59:59.000Z

70

Pulse width modulation inverter with battery charger  

SciTech Connect

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a microprocessor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .theta., where .theta. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands for electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a "flyback" DC-DC converter circuit for recharging the battery.

Slicker, James M. (Union Lake, MI)

1985-01-01T23:59:59.000Z

71

Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources  

SciTech Connect

This report discusses issues and provides solutions for dealing with fault current contributions from inverter-based distributed energy resources.

Keller, J.; Kroposki, B.

2010-01-01T23:59:59.000Z

72

Sizing of Overhead Ground Wires for Lightning  

Science Conference Proceedings (OSTI)

Overhead ground wires, or shield wires, are placed on transmission lines as air terminals for lightning strikes to shield the phase conductors from direct strikes. Although of short duration, lightning strikes to ground wires may result in significant damage. Utilities are increasingly using optical fiber ground wires (OPGWs), and severe damage to the OPGWs could result in failure of the communication link. There is renewed interest in the dimensioning and testing of ground wires for improved ...

2012-12-12T23:59:59.000Z

73

Inverter control systems in the residential heat pump air conditioner  

SciTech Connect

A compressor capacity control with an inverter has been considered from the viewpoint of high energy saving in a refrigerating cycle. However, the system has not been put into practical use because of high initial cost, technical problems of electronic parts, and complexity of system control. In this connection, we developed the new inverter-controlled heat-pump air conditioner by using the latest electronics and refrigeration technology. This paper discusses the trend of energy saving in air conditioners in Japan and the objectives of developing the inverter controlled air conditioner. It also discusses the following items with respect to the inverter controlled air conditioner and the effects of employing an inverter: 1. Inverter for air conditioning; 2. Refrigeration cycle; 3. Air conditioner control with inverter.

Shimma, Y.; Tateuchi, T.; Suglura, H.

1985-01-01T23:59:59.000Z

74

Decomposition Of Invertible And Conformal Transformations  

E-Print Network (OSTI)

In this article, we give a geometric description for any invertible operator on a finite dimensional inner--product space. With the aid of such a description, we are able to decompose any given conformal transformation as a product of planar rotations, a planar rotation or reflection and a scalar transformation. Also, we are able to conclude that an orthogonal transformation is a product of planar rotations and a planar rotation or a reflection.

Srikanth K. V.; Raj Bhawan Yadav

2013-09-10T23:59:59.000Z

75

Inverter testing at Sandia National Laboratories  

SciTech Connect

Inverters are key building blocks of photovoltaic (PV) systems that produce ac power. The balance of systems (BOS) portion of a PV system can account for up to 50% of the system cost, and its reliable operation is essential for a successful PV system. As part of its BOS program, Sandia National Laboratories (SNL) maintains a laboratory wherein accurate electrical measurements of power systems can be made under a variety of conditions. This paper outlines the work that is done in that laboratory.

Ginn, J.W.; Bonn, R.H.; Sittler, G. [Sandia National Labs., Albuquerque, NM (United States). Photovoltaic System Components Dept.

1997-04-01T23:59:59.000Z

76

Status and Needs of Power Electronics for Photovoltaic Inverters  

DOE Green Energy (OSTI)

Photovoltaics is the utility connected distributed energy resource (DER) that is in widespread use today. It has one element, the inverter, which is common with all DER sources except rotating generators. The inverter is required to transfer dc energy to ac energy. With all the DER technologies, (solar, wind, fuel cells, and microturbines) the inverter is still an immature product that will result in reliability problems in fielded systems. Today, the PV inverter is a costly and complex component of PV systems that produce ac power. Inverter MTFF (mean time to first failure) is currently unacceptable. Low inverter reliability contributes to unreliable fielded systems and a loss of confidence in renewable technology. The low volume of PV inverters produced restricts the manufacturing to small suppliers without sophisticated research and reliability programs or manufacturing methods. Thus, the present approach to PV inverter supply has low probability of meeting DOE reliability goals. DOE investments in power electronics are intended to address the reliability and cost of power electronics. This report details the progress of power electronics, identifies technologies that are in current use, and explores new approaches that can provide significant improvements in inverter reliability while leading to lower cost. A key element to improved inverter design is the systems approach to design. This approach includes a list of requirements for the product being designed and a preliminary requirements document is a part of this report. Finally, the design will be for a universal inverter that can be applied to several technologies. The objective of a universal inverter is to increase the quantity being manufactured so that mass-manufacturing techniques can be applied. The report includes the requirements and recommended design approaches for a new inverter with a ten-year mean time to first failure (MTFF) and with lower cost. This development will constitute a ''leap forward'' in capability that leverages emerging technologies and best manufacturing processes to produce a new, high reliability, inverter. The targeted inverter size is from two to ten kilowatts. The report is organized into four sections. A brief introduction by Sandia is followed by Section Two from Millennium Technologies (a company with UPS experience). Section Three is provided by Xantrex (a PV manufacturing company) and the University of Minnesota provided Section Four. This report is very detailed and provides inverter design information that is irrelevant to the layman. It is intended to be a comprehensive documentation of proven technology and the manufacturing skills required to produce a high reliability inverter. An accompanying report will provide a summary of the recommended approach for inverter development.

QIN, YU CHIN; MOHAN, NED; WEST, RICK; BONN, RUSSELL H.

2002-06-01T23:59:59.000Z

77

Status and Needs of Power Electronics for Photovoltaic Inverters  

SciTech Connect

Photovoltaics is the utility connected distributed energy resource (DER) that is in widespread use today. It has one element, the inverter, which is common with all DER sources except rotating generators. The inverter is required to transfer dc energy to ac energy. With all the DER technologies, (solar, wind, fuel cells, and microturbines) the inverter is still an immature product that will result in reliability problems in fielded systems. Today, the PV inverter is a costly and complex component of PV systems that produce ac power. Inverter MTFF (mean time to first failure) is currently unacceptable. Low inverter reliability contributes to unreliable fielded systems and a loss of confidence in renewable technology. The low volume of PV inverters produced restricts the manufacturing to small suppliers without sophisticated research and reliability programs or manufacturing methods. Thus, the present approach to PV inverter supply has low probability of meeting DOE reliability goals. DOE investments in power electronics are intended to address the reliability and cost of power electronics. This report details the progress of power electronics, identifies technologies that are in current use, and explores new approaches that can provide significant improvements in inverter reliability while leading to lower cost. A key element to improved inverter design is the systems approach to design. This approach includes a list of requirements for the product being designed and a preliminary requirements document is a part of this report. Finally, the design will be for a universal inverter that can be applied to several technologies. The objective of a universal inverter is to increase the quantity being manufactured so that mass-manufacturing techniques can be applied. The report includes the requirements and recommended design approaches for a new inverter with a ten-year mean time to first failure (MTFF) and with lower cost. This development will constitute a ''leap forward'' in capability that leverages emerging technologies and best manufacturing processes to produce a new, high reliability, inverter. The targeted inverter size is from two to ten kilowatts. The report is organized into four sections. A brief introduction by Sandia is followed by Section Two from Millennium Technologies (a company with UPS experience). Section Three is provided by Xantrex (a PV manufacturing company) and the University of Minnesota provided Section Four. This report is very detailed and provides inverter design information that is irrelevant to the layman. It is intended to be a comprehensive documentation of proven technology and the manufacturing skills required to produce a high reliability inverter. An accompanying report will provide a summary of the recommended approach for inverter development.

QIN, YU CHIN; MOHAN, NED; WEST, RICK; BONN, RUSSELL H.

2002-06-01T23:59:59.000Z

78

Plasma arc torch with coaxial wire feed  

SciTech Connect

A plasma arc welding apparatus having a coaxial wire feed. The apparatus includes a plasma arc welding torch, a wire guide disposed coaxially inside of the plasma arc welding torch, and a hollow non-consumable electrode. The coaxial wire guide feeds non-electrified filler wire through the tip of the hollow non-consumable electrode during plasma arc welding. Non-electrified filler wires as small as 0.010 inches can be used. This invention allows precision control of the positioning and feeding of the filler wire during plasma arc welding. Since the non-electrified filler wire is fed coaxially through the center of the plasma arc torch's electrode and nozzle, the wire is automatically aimed at the optimum point in the weld zone. Therefore, there is no need for additional equipment to position and feed the filler wire from the side before or during welding.

Hooper, Frederick M (Albuquerque, NM)

2002-01-01T23:59:59.000Z

79

Preparation of Aluminum Nickel Nanosized Powders by Pulsed Wire ...  

Science Conference Proceedings (OSTI)

With the direct heating of wire by the current, the whole wire evaporates within a few microseconds and then condenses in inert gas. Wound wires with two or ...

80

Laser Cladding with Hybrid Hot Wire - Programmaster.org  

Science Conference Proceedings (OSTI)

Presentation Title, Laser Cladding with Hybrid Hot Wire ... The Laser Hot Wire process is used to deposit solid and cored wire products onto hydraulic shafts and ...

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Wire Making Techniques - HTS Coated Conductors - Fact Sheet ...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Wire Making Techniques - HTS Coated Conductors - Fact Sheet Wire Making Techniques - HTS Coated Conductors - Fact Sheet Wire Making Techniques - HTS Coated Conductors - Fact Sheet...

82

Vehicles - ORNL inverter a boost for EVs . . . | ornl.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Vehicles - ORNL inverter a boost for EVs . . . Vehicles - ORNL inverter a boost for EVs . . . Less expensive, lighter and more efficient inverters could put hybrid electric vehicles on the highway to improved viability. While batteries receive a lot of attention, Oak Ridge National Laboratory inventor Gui-Jia Su noted that inverters, which convert direct current into alternating current, play an equally important role in powering hybrid electric vehicles. The patent-pending ORNL inverter is more compact, reduces battery losses, improves operating conditions and reliability, and can be operated in high-temperature conditions. The inverter also significantly reduces undesirable motor torque ripples, which increase or decrease output torque as the output shaft rotates. In addition to uses in hybrid electric

83

Multilevel cascade voltage source inverter with seperate DC sources  

SciTech Connect

A multilevel cascade voltage source inverter having separate DC sources is described herein. This inverter is applicable to high voltage, high power applications such as flexible AC transmission systems (FACTS) including static VAR generation (SVG), power line conditioning, series compensation, phase shifting and voltage balancing and fuel cell and photovoltaic utility interface systems. The M-level inverter consists of at least one phase wherein each phase has a plurality of full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with only one switching per cycle as the number of levels, M, is increased. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations.

Peng, Fang Zheng (Oak Ridge, TN); Lai, Jih-Sheng (Knoxville, TN)

1997-01-01T23:59:59.000Z

84

Multilevel cascade voltage source inverter with seperate DC sources  

DOE Patents (OSTI)

A multilevel cascade voltage source inverter having separate DC sources is described herein. This inverter is applicable to high voltage, high power applications such as flexible AC transmission systems (FACTS) including static VAR generation (SVG), power line conditioning, series compensation, phase shifting and voltage balancing and fuel cell and photovoltaic utility interface systems. The M-level inverter consists of at least one phase wherein each phase has a plurality of full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with only one switching per cycle as the number of levels, M, is increased. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations.

Peng, Fang Zheng (Knoxville, TN); Lai, Jih-Sheng (Blacksburg, VA)

2002-01-01T23:59:59.000Z

85

Novel multilevel inverter carrier-based PWM method  

SciTech Connect

The advent of the transformerless multilevel inverter topology has brought forth various pulsewidth modulation (PWM) schemes as a means to control the switching of the active devices in each of the multiple voltage levels in the inverter. An analysis of how existing multilevel carrier-based PWM affects switch utilization for the different levels of a diode-clamped inverter is conducted. Two novel carrier-based multilevel PWM schemes are presented which help to optimize or balance the switch utilization in multilevel inverters. A 10-kW prototype six-level diode-clamped inverter has been built and controlled with the novel PWM strategies proposed in this paper to act as a voltage-source inverter for a motor drive.

Tolbert, L.M.; Habetler, T.G.

1999-10-01T23:59:59.000Z

86

Discrete pulse modulation strategies for high-frequency inverter systems  

SciTech Connect

High-performance high-frequency inverter systems for UPS applications represent a demanding application that cannot be easily realized using conventional hard-switched PWM inverter topologies. Adoption of typical soft-switched inverters such as the resonant dc link inverter require the use of discrete pulse modulation strategies. New controller structures are necessary to cope with stringent voltage regulation and distortion constraints in the presence of unbalanced and nonlinear loads. This paper presents a controller that utilizes load current feed-forward strategy with a cost function current regulator to achieve excellent transient performance characteristics. Voltage regulation is ensured using a synchronous frame regulator. Detailed simulation and experimental results verifying the concepts are presented. Although this paper focuses on soft-switching inverters, the control concepts can be applied to conventional hard-switching inverters as well.

Venkataramanan, G. (Montana State Univ., Bozeman, MT (United States). Dept. of Electrical Engineering); Divan, D.M. (Univ. of Wisconsin, Madison, WI (United States). Dept. of Electrical and Computer Engineering); Jahns, T.M. (General Electric Co., Schenectady, NY (United States))

1993-07-01T23:59:59.000Z

87

Multilevel cascade voltage source inverter with separate DC sources  

DOE Patents (OSTI)

A multilevel cascade voltage source inverter having separate DC sources is described herein. This inverter is applicable to high voltage, high power applications such as flexible AC transmission systems (FACTS) including static VAR generation (SVG), power line conditioning, series compensation, phase shifting and voltage balancing and fuel cell and photovoltaic utility interface systems. The M-level inverter consists of at least one phase wherein each phase has a plurality of full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with only one switching per cycle as the number of levels, M, is increased. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations. 15 figs.

Peng, F.Z.; Lai, J.S.

1997-06-24T23:59:59.000Z

88

High efficiency inverter and ballast circuits  

SciTech Connect

A high efficiency push-pull inverter circuit employing a pair of relatively high power switching transistors is described. The switching on and off of the transistors is precisely controlled to minimize power losses due to common-mode conduction or due to transient conditions that occur in the process of turning a transistor on or off. Two current feed-back transformers are employed in the transistor base drives; one being saturable for providing a positive feedback, and the other being non-saturable for providing a subtractive feedback.

Nilssen, O.K.

1984-02-07T23:59:59.000Z

89

Operating standby redundant controller to improve voltage source inverter reliability .  

E-Print Network (OSTI)

??This thesis presents a control architecture that achieves operating standby redundancy for a voltage source inverter controller. The system was designed to increase reliability by… (more)

Blevins, Stephen T.

2007-01-01T23:59:59.000Z

90

Role of inverters in grid of the future  

Science Conference Proceedings (OSTI)

... SiC-based components Control systems for inverters Better plastics in packaging that lasts more than 10-15 years. Technology ...

2012-09-11T23:59:59.000Z

91

Controlling engine exhaust gas recirculation and vacuum inverter  

SciTech Connect

Engine manifold vacuum is inverted by an in-line vacuum inverter which provides a power source for an egr valve actuator for providing desired egr flow in a predetermined range of engine power loading and egr flow is cut off outside the range. The invention utilizes a vacuum inverter employing a pair of spaced diaphragms for controlling an atmospheric air bleed valve to a vacuum chamber powered by manifold vacuum. The diaphragms are spring loaded so as to seek equilibrium positions as vacuum in the chamber varies force. The inverter produces a vacuum output signal which changes inversely with changes in engine manifold vacuum.

Bradshaw, C.E.; Uitvlugt, M.W.

1982-12-28T23:59:59.000Z

92

2012 SG Peer Review - Smart Inverter Controls and Microgrid Interopera...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

* On-gridislanding modes * MG Energy Management * Integration of renewables d Multiple smart inverters Flexible test bed Tech transfer MG architecture FY12: 12% Load...

93

Electrical wire insulation and electromagnetic coil  

DOE Patents (OSTI)

An electromagnetic coil for high temperature and high radiation application in which glass is used to insulate the electrical wire. A process for applying the insulation to the wire is disclosed which results in improved insulation properties.

Bich, George J. (Penn Hills, PA); Gupta, Tapan K. (Monroeville, PA)

1984-01-01T23:59:59.000Z

94

Lightweight PV Inverters: Dual Bi-Directional IGBTs Modules Enables Breakthrough PV Inverter Using Current Modulation Topology  

Science Conference Proceedings (OSTI)

Solar ADEPT Project: PV inverters convert DC power generated by modules into usable AC power. IPC’s initial 30kW 94lb. PV inverter reduces the weight of comparable 30kW PV inverters by 90%—reducing the cost of materials, manufacturing, shipping, and installation. With ARPA-E support, new bi-directional silicon power switches will be developed, commercialized, and utilized in IPC’s next-generation PV inverter. With these components, IPC will produce 100kW inverters that weight less than 100lb., reducing the weight of conventional 3,000lb. 100kW inverters by more than 95%. The new power switches will cut IPC’s $/W manufacturing cost in half, as well as further reduce indirect shipping and installation costs.

None

2012-01-30T23:59:59.000Z

95

Dual Mode Inverter Control Test Verification  

SciTech Connect

Permanent Magnet Motors with either sinusoidal back emf (permanent magnet synchronous motor [PMSM]) or trapezoidal back emf (brushless dc motor [BDCM]) do not have the ability to alter the air gap flux density (field weakening). Since the back emf increases with speed, the system must be designed to operate with the voltage obtained at its highest speed. Oak Ridge National Laboratory's (ORNL) Power Electronics and Electric Machinery Research Center (PEEMRC) has developed a dual mode inverter controller (DMIC) that overcomes this disadvantage. This report summarizes the results of tests to verify its operation. The standard PEEMRC 75 kW hard-switched inverter was modified to implement the field weakening procedure (silicon controlled rectifier enabled phase advance). A 49.5 hp motor rated at 2800 rpm was derated to a base of 400 rpm and 7.5 hp. The load developed by a Kahn Industries hydraulic dynamometer, was measured with a MCRT9-02TS Himmelstein and Company torque meter. At the base conditions a current of 212 amperes produced the 7.5 hp. Tests were run at 400, 1215, and 2424 rpm. In each run, the current was no greater than 214 amperes. The horsepower obtained in the three runs were 7.5, 9.3, and 8.12. These results verified the basic operation of the DMIC in producing a Constant Power Speed Ratios (CPSR) of six.

Bailey, J.M.

2001-04-25T23:59:59.000Z

96

Development of a modular, bi-directional power inverter for photovoltaic applications. Annual technical progress report, August 1995--August 1996  

DOE Green Energy (OSTI)

The goal of this research and development contract is to develop and prototype for manufacturing a modular, bi-directional power inverter for photovoltaic applications. This modular inverter will be used as building block for larger inverters by connecting in parallel (for higher power) or in series (for higher AC voltage) or both. The modular inverter will be capable of being interconnected for single, split and three phase configurations for both 60 hertz (domestic) and 50 hertz (international) applications. The design will also construction of units with different DC input voltages and AC output voltages to further satisfy various application and market requirements. By standardizing on a single {open_quotes}building block{close_quotes} inverter module, the need to build multiple models and sizes for different application can be avoided. The higher volume of a single design will allow improved manufacturing and will result in higher reliability by reducing low volume will allow improved manufacturing will result in higher reliability by reducing low volume modifications. The result will be lower cost and improved performance of photovoltaic systems.

Freitas, C. [Trace Engineering Company, Inc., Arlington, WA (United States)

1997-08-01T23:59:59.000Z

97

Adaptable Inverter for Injection of Fuel Cell and Photovoltaic Power  

E-Print Network (OSTI)

important to apply renewable energies and efficient technologies. For power injection of photovoltaic with different energy sources such as photovoltaic, fuel cell and battery. It is possible to adjust active inverter. These inverters for injection of photovoltaic energy are developed only for this purpose

Kulig, Stefan

98

Scalable techniques for document identifier assignment in inverted indexes  

Science Conference Proceedings (OSTI)

Web search engines depend on the full-text inverted index data structure. Because the query processing performance is so dependent on the size of the inverted index, a plethora of research has focused on fast end effective techniques for compressing ... Keywords: documentID reassignment, index compression

Shuai Ding; Josh Attenberg; Torsten Suel

2010-04-01T23:59:59.000Z

99

Droop-Controlled Inverters in Microgrids are Kuramoto Oscillators  

E-Print Network (OSTI)

Droop-Controlled Inverters in Microgrids are Kuramoto Oscillators John W. Simpson-Porco Florian D and renewable energy, we study the parallel operation of DC/AC inverters in a lossless microgrid. We show; Electric power systems; Load flow solutions; 1. INTRODUCTION Microgrids appear to be the most natural

Bullo, Francesco

100

Phase Locked Loop Control of Inverters in a Microgrid  

E-Print Network (OSTI)

Phase Locked Loop Control of Inverters in a Microgrid Matthew Surprenant Dept of ECE University Venkataramanan Dept of ECE University of Wisconsin Madison, WI, USA Abstract--Microgrids are small for inverter-based microsources within a mi- crogrid. The general control philosophy within a microgrid

Hiskens, Ian A.

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Results of Sandia National Laboratories grid-tied inverter testing  

SciTech Connect

This paper proposes a definition for a Non-Islanding Inverter. This paper also presents methods that can be used to implement such an inverter, along with references to prior work on the subject. Justification for the definition is provided on both a theoretical basis and results from tests conducted at Sandia National Laboratories and Ascension Technology, Inc.

Kern, G.A. [Ascension Technology, Inc., Boulder, CO (United States); Bonn, R.H.; Ginn, J.; Gonzalez, S. [Sandia National Labs., Albuquerque, NM (United States)

1998-07-01T23:59:59.000Z

102

Optimal Dispatch of Photovoltaic Inverters in Residential Distribution Systems  

E-Print Network (OSTI)

- fined limit. The premise for these active power curtailment (APC) strategies is that the resistance method for determining the active- and reactive-power set points for PV inverters in resi- dential. Index Terms--Distribution networks, inverter control, photo- voltaic systems, optimal power flow

Giannakis, Georgios

103

Zero-switching-loss inverters for high-power applications  

SciTech Connect

The development of zero-switching-loss inverters has attracted much interest for industrial applications. The resonant dc link inverter (RDCLI) provides a simple and robust approach for realizing switching frequencies >20 kHz in multi-kilowatt systems but impresses substantial voltage stress (-- 2.5 supply voltage) across the devices. Two alternate topologies for realizing zero switching losses in high-power converters are proposed. The actively clamped resonant dc-link inverter (ACRLI) uses the concept of a lossless active clamp to restrict voltage stresses to only 1.3-1.5 supply voltage (V/sub s/) while maintaining a mode of operation similar to the RDCLI. For applications demanding substantially superior spectral performance, the resonant pole inverter (RPI), also called the quasi-resonant current mode inverter (QRCMI), is proposed as a viable topology. Detailed analysis, simulation, and experimental results are presented to verify operation principles of both power converters.

Divan, D.M.; Skibinski, G. (Wisconsin Univ., Madison, WI (USA). Dept. of Electrical and Computer Engineering)

1989-07-01T23:59:59.000Z

104

Experimental Analysis of Variable Capacity Heat Pump Systems equipped with a liquid-cooled frequency inverter.  

E-Print Network (OSTI)

?? Using an inverter-driven compressor in variable capacity heat pump systems has a main drawback, which is the extra loss in the inverter. The present… (more)

Ebraheem, Thair

2013-01-01T23:59:59.000Z

105

Analysis of inverter models and harmonic propagation. Part III. Transient processes in inverter models  

SciTech Connect

Part III of a three part study presents the theoretical analysis and the experimental verification of transient processes that arise in the photovoltaic power system during its normal commutational operations. A general description of the transient processes problem and the method of analysis is presented. The transient processes in the inverter model with an inductive filter are analyzed for both the discontinuous and the continuous currents on the dc side of the inverter, and the problem of transient processes due to the change in illumination level is discussed. Transient processes in the inverter model with capacitive filter are analyzed with special emphasis on the process that arises in the photovoltaic power system immediately after the first ignition of the thyristors. The influence of the operating point of the solar cell array on the transient process is discussed. A sequence for optimal operations is recommended. Part I of the study (SAND 7040/1) contains a detailed description of the microcomputer based simulator that represents the output characteristics of the five commercially available types of solar cell arrays under different environmental conditions, and Part II (SAND 7040/2) describes the harmonics in the photovoltaic power system.

Slonim, M.A.; Stanek, E.K.

1984-09-01T23:59:59.000Z

106

Method and apparatus for laying wire arrays  

DOE Patents (OSTI)

Wire arrays (11) having a continuous wire (12) which is formed into a predetermined pattern and adhered to a backing material or substrate (13) are fabricated by applying adhesive material (16a, 16b) along opposite edge portions (17, 18) of the substrate, positioning a row of winding spools (21) along each of the edge portions and repeatedly extending the wire between and around successive spools at the opposite edge portions. The wound wire is then traveled along each spool toward the substrate and into contact with the adhesive. The spools are then removed and a coating of hardenable material (54) is applied to secure the wound wire to the substrate. Tension in the wire is relieved prior to contact of the wire with the adhesive and a small amount of slack is introduced into the wire before the final coating step. Mechanism (32) is provided for lifting the spools away from the substrate without disturbing the wound wire. The method and apparatus enable manufacture of precisely configured wire arrays without complex or costly equipment and do not require structural alterations in the substrate for the purpose of accommodating to fabrication equipment.

Horowitz, Seymour M. (6525 Swainland Dr., Oakland, CA 94611); Nesbitt, Dale D. (1712 Marin Ave., Berkeley, CA 94707)

1986-01-01T23:59:59.000Z

107

Spectroscopic research of underwater electrical wire explosion  

Science Conference Proceedings (OSTI)

Results of spectroscopic research in the visible range of light of the radiation generated by underwater electrical wire explosions (UEWE) are presented. A pulsed generator with an output voltage of {approx}110 kV, current of {approx}70 kA, and rise time of {approx}60 ns was used for electrical explosion of Cu wires 0.1 mm in diameter and 50 mm in length. It was shown that UEWE is not governed by the 'polarity' effect, which plays an important role in electrical wire explosions in vacuum. The results of detailed space- and time-resolved spectroscopic measurements show that the radiation spectrum differs significantly of the spectrum expected from the exploding wire. A model is suggested based on the formation of a few {mu}m 'water' plasma layer in the vicinity of the exploding wire plasma which efficiently absorbs the radiation of the exploding wire.

Fedotov, A.; Sheftman, D.; Gurovich, V. Tz.; Efimov, S.; Bazilitski, G.; Krasik, Ya. E. [Physics Department, Technion-Israel Institute of Technology, 32000 Haifa (Israel); Oreshkin, V. I. [Institute of High Current Electronics, RAS, Tomsk (Russian Federation)

2008-08-15T23:59:59.000Z

108

Direct Comparison of Inverted and Non-Inverted Growths of GaInP Solar Cells: Preprint  

DOE Green Energy (OSTI)

The inverted growth of III-V solar cells presents some specific challenges that are not present in regular, non-inverted growths. Because the highly doped top contact layer is grown first, followed by the lengthy high-temperature growth of the remainder of the structure, there is ample time for the dopants in the contact layer to diffuse away. This leads to an increase in the contact resistance to the top layer, and a corresponding drop in voltage. The diffusion of dopants in other layers is similarly altered with respect to the non-inverted configuration because of the change in growth sequence. We compare the dopant profiles of inverted and non-inverted structures by using secondary ion mass spectroscopy and correlate the results with the observed performance of the devices. We also describe a technique for growing a GaInAsN contact layer in the inverted configuration and show that it achieves a specific contact resistance comparable to what is normally observed in non-inverted cells.

Steiner, M. A.; Geisz, J. F.; Reedy Jr, R.C.; Kurtz, S.

2008-05-01T23:59:59.000Z

109

Mixed and Dynamic Response of Hot Wires and Cold Wires and Measurements of Turbulence Statistics  

Science Conference Proceedings (OSTI)

Hot wires respond to temperature as well as to velocity, whereas cold wires respond to velocity as well as to temperature. The static and dynamic response characteristics are summarized and it is shown that the frequency transfer functions for ...

S. E. Larsen; J. Hojstrup; C. W. Fairall

1986-06-01T23:59:59.000Z

110

High Strength Gold Wire for Microelectronics Miniaturization ...  

ISU and Ames Laboratory researchers have developed a high strength gold wire for use in microelectronics that can maintain its electrical and mechanical properties ...

111

ORNL superconducting wire yields unprecedented performance |...  

NLE Websites -- All DOE Office Websites (Extended Search)

ORNL | News | News Releases | 2013 SHARE Media Contact: Morgan McCorkle Communications 865.574.7308 ORNL superconducting wire yields unprecedented performance This figure shows the...

112

Thin californium-containing radioactive source wires  

SciTech Connect

A cermet wire includes at least 1% californium-252 and is characterized by a diameter of no more than 0.0225 inch.

Gross, Ian G (Clinton, TN); Pierce, Larry A (Kingston, TN)

2012-01-03T23:59:59.000Z

113

Inverted Metamorphic Multijunction (IMM) Cell Processing Instructions  

DOE Green Energy (OSTI)

This technical report details the processing schedule used to fabricate Inverted Metamorphic Multijunction (IMM) concentrator solar cells at The National Renewable Energy Laboratory (NREL). These devices are used as experimental test structures to support the research at NREL that is focused on increasing the efficiency of photovoltaic power conversion. They are not intended to be devices suitable for deployment in working concentrator systems primarily because of heat sinking issues. The process schedule was developed to be compatible with small sample sizes and to afford relatively rapid turn-around times, in support of research efforts. The report describes the use of electro deposition of gold for both the back and front contacts. Electro-deposition is used because of its rapid turn around time and because it is a benign metallization technique that is seldom responsible for damage to the semiconductors. The layer transfer technique is detailed including the use of a commercially available adhesive and the etching away of the parent gallium arsenide substrate. Photolithography is used to define front contact grids as well as the mesa area of the cell. Finally, the selective wet chemical etchant system is introduced and its use to reveal the back contact is described.

Duda, A.; Ward, S.; Young, M.

2012-02-01T23:59:59.000Z

114

Inverter Testing at Sandia National Laboratories* Jerry W. Ginn  

Office of Scientific and Technical Information (OSTI)

Inverter Testing at Sandia National Inverter Testing at Sandia National Laboratories* Jerry W. Ginn Russell H. Bonn Photovoltaic System Components Department Sandia National Laboratories PO Box 5800 Albuquerque, NM 87185-0752 Abstract. Inverters are key building blocks of photovoltaic (PV) systems that produce ac power. The balance of systems @OS) portion of a PV system can account for up to 50% of the system cost, and its reliable operation is essential for a successful PV system. As part of its BOS program, Sandia National Laboratories (SNL) maintains a laboratory wherein accurate electrical measurements of power systems can be made under a variety of conditions. This paper outlines the work that is done in that laboratory. TESTING ACTIVITIES Inverter testing at SNL thus far

115

Definition: Controllable/Regulating Inverter | Open Energy Information  

Open Energy Info (EERE)

Controllable/Regulating Inverter Controllable/Regulating Inverter Jump to: navigation, search Dictionary.png Controllable/Regulating Inverter AC to DC converters that properly regulate voltage and can be controlled remotely. These devices can significantly increase the integration of renewable or intermittent sources of electricity.[1] View on Wikipedia Wikipedia Definition Also Known As Mechanical rectifier Related Terms electricity generation References ↑ [www.smartgrid.gov/sites/default/files/pdfs/description_of_assets.pdf SmartGrid.gov 'Description of Assets'] An LikeLike UnlikeLike You like this.Sign Up to see what your friends like. inline Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Controllable/Regulating_Inverter&oldid=480447" Categories:

116

Optically Isolated HVIGBT Based MW Cascade Inverter Building...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High-Voltage, IGBT-Based Inverter for DER Applications Presentation at DOE Energy Storage Systems Research Program Peer Review Washington, DC November 2, 2006 SBIR Phase II Grant...

117

Series Resonant Inverter with Contactless Transformers for Multiple LED Lamps.  

E-Print Network (OSTI)

??A half-bridge series-resonant inverter adopted to realize the quasi current source and the constant current source with a number of contactless transformers in series for… (more)

Cheng, Shuen-Wen

2013-01-01T23:59:59.000Z

118

Performance model for grid-connected photovoltaic inverters.  

SciTech Connect

This document provides an empirically based performance model for grid-connected photovoltaic inverters used for system performance (energy) modeling and for continuous monitoring of inverter performance during system operation. The versatility and accuracy of the model were validated for a variety of both residential and commercial size inverters. Default parameters for the model can be obtained from manufacturers specification sheets, and the accuracy of the model can be further refined using measurements from either well-instrumented field measurements in operational systems or using detailed measurements from a recognized testing laboratory. An initial database of inverter performance parameters was developed based on measurements conducted at Sandia National Laboratories and at laboratories supporting the solar programs of the California Energy Commission.

Boyson, William Earl; Galbraith, Gary M.; King, David L.; Gonzalez, Sigifredo

2007-09-01T23:59:59.000Z

119

Triple inverter pierce oscillator circuit suitable for CMOS  

SciTech Connect

An oscillator circuit is disclosed which can be formed using discrete field-effect transistors (FETs), or as a complementary metal-oxide-semiconductor (CMOS) integrated circuit. The oscillator circuit utilizes a Pierce oscillator design with three inverter stages connected in series. A feedback resistor provided in a feedback loop about a second inverter stage provides an almost ideal inverting transconductance thereby allowing high-Q operation at the resonator-controlled frequency while suppressing a parasitic oscillation frequency that is inherent in a Pierce configuration using a "standard" triple inverter for the sustaining amplifier. The oscillator circuit, which operates in a range of 10 50 MHz, has applications for use as a clock in a microprocessor and can also be used for sensor applications.

Wessendorf; Kurt O. (Albuquerque, NM)

2007-02-27T23:59:59.000Z

120

Regional Characteristics for Interpreting Inverted Echo Sounder (IES) Observations  

Science Conference Proceedings (OSTI)

Changes in round-trip acoustc travel time (?) measured between a bottom moored inverted echo sounder and the sea surface can be interpreted as changes in dynamic height (D) with suitable calibration information. The ?, D, and isotherm and ...

Zachariah R. Hallock

1987-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

The Application of Diode-Clamped Cascaded Inverter in the Direct-Driven Wind Power System  

Science Conference Proceedings (OSTI)

Power inverter is widely used in direct-driven variable speed constant frequency (VSVF) wind power system. With the level of wind power jumping from the kilowatt to megawatt, topologies and control of inverter have a corresponding change. Considering ... Keywords: direct-driven wind power, multi-level inverter, diode-clamped cascaded inverter, PD-SPWM and CPS-SPWM

Xianglian Xu; Pingting Xu; Zilin Tang; Gang Tang; Xiaole Ye

2012-04-01T23:59:59.000Z

122

Smart Inverter Field Experiences: A State of the Industry Overview  

Science Conference Proceedings (OSTI)

The inverters that connect solar photovoltaic, battery, and other distributed resources to the power grid have the potential to provide a number of services or functions that may be useful to utilities. Inverter manufacturers have been designing and implementing these capabilities into their products for many years. During the past few years, significant industry effort has been expended in the identification of a common set of such functions that may be supported by open standards and implemented ...

2013-12-23T23:59:59.000Z

123

Test Protocol for Smart Inverter Grid Support Functions: Version 1  

Science Conference Proceedings (OSTI)

Smart inverters are capable of providing grid support that is important to accommodate higher penetrations of distributed energy resources (DERs) on the distribution circuits. With the exception of a few countries in Europe, especially Germany, there are currently no clear and consistent performance requirements defined for the smart inverter advanced support functions. Currently, widely adopted grid interconnection standard IEEE Std. 1547 (2003) and the associated conformance test standard IEEE ...

2013-12-20T23:59:59.000Z

124

ADAPTIVE HYSTERESIS CURRENT CONTROL OF INVERTER FOR SOLAR PHOTOVOLTAIC APPLICATIONS  

E-Print Network (OSTI)

Abstract – Power inverters are used to convert the D.C power produced by the solar photovoltaic cell into AC. This paper presents a novel Adaptive Hysteresis Current Controller to control the inverter, used in the solar photovoltaic cell. The proposed controller is capable of reducing the total harmonic distortion and to provide constant switching frequency. The mathematical model of Photovoltaic array is developed using the Newton’s method using the parameter obtained from a commercial photovoltaic data sheet under variable weather conditions, in which the effect of irradiance and temperature are considered. The modeled Photovoltaic array is interfaced with DC-DC boost converter, AC-DC inverter and load. A DC-DC boost converter is used to step up the input DC voltage of the Photovoltaic array while the DC-AC single-phase inverter converts the input DC comes from boost converter into AC. The performance of the proposed controller of inverter is evaluated through MATLAB-Simulation. The results obtained with the proposed algorithm are compared with those obtained when using conventional fixed hysteresis current controller for single-phase photovoltaic inverter in terms of THD and switching frequency.

unknown authors

2011-01-01T23:59:59.000Z

125

Improved Superconducting Wire for Wind Generators: Superconducting Wires for Direct-Drive Wind Generators  

SciTech Connect

REACT Project: Brookhaven National Laboratory will develop a low-cost superconducting wire that could be used in high-power wind generators. Superconducting wire currently transports 600 times more electric current than a similarly sized copper wire, but is significantly more expensive. Brookhaven National Laboratory will develop a high-performance superconducting wire that can handle significantly more electrical current, and will demonstrate an advanced manufacturing process that has the potential to yield a several-fold reduction in wire costs while using a using negligible amount of rare earth material. This design has the potential to make a wind turbine generator lighter, more powerful, and more efficient, particularly for offshore applications.

2012-01-01T23:59:59.000Z

126

Lansce Wire Scanning Diagnostics Device Mechanical Design  

SciTech Connect

The Accelerator Operations & Technology Division at Los Alamos National Laboratory operates a linear particle accelerator which utilizes 110 wire scanning diagnostics devices to gain position and intensity information of the proton beam. In the upcoming LANSCE improvements, 51 of these wire scanners are to be replaced with a new design, up-to-date technology and off-the-shelf components. This document outlines the requirements for the mechanical design of the LANSCE wire scanner and presents the recently developed linac wire scanner prototype. Additionally, this document presents the design modifications that have been implemented into the fabrication and assembly of this first linac wire scanner prototype. Also, this document will present the design for the second, third, and fourth wire scanner prototypes being developed. Prototypes 2 and 3 belong to a different section of the particle accelerator and therefore have slightly different design specifications. Prototype 4 is a modification of a previously used wire scanner in our facility. Lastly, the paper concludes with a plan for future work on the wire scanner development.

Rodriguez Esparza, Sergio [Los Alamos National Laboratory; Batygin, Yuri K. [Los Alamos National Laboratory; Gilpatrick, John D. [Los Alamos National Laboratory; Gruchalla, Michael E. [Los Alamos National Laboratory; Maestas, Alfred J. [Los Alamos National Laboratory; Pillai, Chandra [Los Alamos National Laboratory; Raybun, Joseph L. [Los Alamos National Laboratory; Sattler, F. D. [Los Alamos National Laboratory; Sedillo, James Daniel [Los Alamos National Laboratory; Smith, Brian G. [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

127

LANSCE-R WIRE-SCANNER SYSTEM  

SciTech Connect

The National Instruments cRIO platform is used for the new LANSCE-R wire-scanner systems. All wire-scanner electronics are integrated into a single BiRa BiRIO 4U cRIO chassis specifically designed for the cRIO crate and all interface electronics. The BiRIO chassis, actuator and LabVIEW VIs provide a complete wire-scanner system integrated with EPICS. The new wire-scanner chassis includes an 8-slot cRIO crate with Virtex-5 LX 110 FPGA and Power-PC real-time controller, the LANL-developed cRIO 2-axis wire-sensor analog interface module (AFE), NI9222 cRIO 4-channel 16-bit digitizer, cRIO resolver demodulator, cRIO event receiver, front-panel touch panel display, motor driver, and all necessary software, interface wiring, connectors and ancillary components. This wirescanner system provides a complete, turn-key, 2-axis wire-scanner system including 2-channel low-noise sensewire interface with variable DC wire bias and wireintegrity monitor, 16-bit signal digitizers, actuator motor drive and control, actuator position sensing, limit-switch interfaces, event receiver, LabVIEW and EPICS interface, and both remote operation and full stand-alone operation using the touch panel.

Gruchalla, Michael E. [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

128

Superconducting wire with improved strain characteristics  

DOE Patents (OSTI)

A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improves the strain characteristics of the wire.

Luhman, Thomas (Westhampton Beach, NY); Klamut, Carl J. (E. Patchogue, NY); Suenaga, Masaki (Bellport, NY); Welch, David (Stony Brook, NY)

1982-01-01T23:59:59.000Z

129

Superconducting wire with improved strain characteristics  

DOE Patents (OSTI)

A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improve the strain characteristics of the wire.

Luhman, Thomas (Westhampton Beach, NY); Klamut, Carl J. (East Patchogue, NY); Suenaga, Masaki (Bellport, NY); Welch, David (Stony Brook, NY)

1982-01-01T23:59:59.000Z

130

Superconducting wire with improved strain characteristics  

DOE Patents (OSTI)

A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improve the strain characteristics of the wire.

Luhman, T.; Klamut, C.J.; Suenaga, M.; Welch, D.

1979-12-19T23:59:59.000Z

131

Method of preparing composite superconducting wire  

DOE Patents (OSTI)

An improved method of preparing composite multifilament superconducting wire of Nb.sub.3 Sn in a copper matrix which eliminates the necessity of coating the drawn wire with tin. A generalized cylindrical billet of an alloy of copper containing at least 15 weight percent niobium, present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles, is provided with at least one longitudinal opening which is filled with tin to form a composite drawing rod. The drawing rod is then drawn to form a ductile composite multifilament wire containing a filament of tin. The ductile wire containing the tin can then be wound into magnet coils or other devices before heating to diffuse the tin through the wire to react with the niobium forming Nb.sub.3 Sn. Also described is an improved method for making large billets of the copper-niobium alloy by consumable-arc casting.

Verhoeven, John D. (Ames, IA); Gibson, Edwin D. (Ames, IA); Finnemore, Douglas K. (Ames, IA); Ostenson, Jerome E. (Ames, IA); Schmidt, Frederick A. (Ames, IA); Owen, Charles V. (Ames, IA)

1985-08-06T23:59:59.000Z

132

Improved method of preparing composite superconducting wire  

DOE Patents (OSTI)

An improved method of preparing composite multifilament superconducting wire of Nb/sub 3/Sn in a copper matrix eliminates the necessity of coating the drawn wire with tin. A generalized cylindrical billet of an alloy of copper containing at least 15 weight percent niobium, present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles, is provided with at least one longitudinal opening which is filled with tin to form a composite drawing rod. The drawing rod is then drawn to form a ductile composite multifilament wire containing a filament of tin. The ductile wire containing the tin can then be wound into magnet coils or other devices before heating to diffuse the tin through the wire to react with the niobium forming Nb/sub 3/Sn. Also described is an improved method for making large billets of the copper-niobium alloy by consumable-arc casting.

Verhoeven, J.D.; Gibson, E.D.; Finnemore, D.K.; Ostenson, J.E.; Schmidt, F.A.; Owen, C.V.

1979-10-17T23:59:59.000Z

133

Improved method of preparing composite superconducting wire  

DOE Patents (OSTI)

An improved method of preparing composite multifilament superconducting wire of Nb/sub 3/Sn in a copper matrix which eliminates the necessity of coating the drawn wire with tin is described. A generalized cylindrical billet of an alloy of copper containing at least 15 weight percent niobium, present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles, is provided with at least one longitudinal opening which is filled with tin to form a composite drawing rod. The drawing rod is then drawn to form a ductile composite multifilament wire containing a filament of tin. The ductile wire containing the tin can then be wound into magnet coils or other devices before heating to diffuse the tin through the wire to react with the niobium forming Nb/sub 3/Sn. Also described is an improved method for making large billets of the copper-niobium alloy by consumable-arc casting.

Verhoeven, J.D.; Gibson, E.D.; Finnemore, D.K.; Ostenson, J.E.; Schmidt, F.A.; Owen, C.V.

1981-04-24T23:59:59.000Z

134

Early expansion in exploding multiple wire arrays  

Science Conference Proceedings (OSTI)

A simple model is developed for the initial stage (blow-off and the onset of pinching) of a multiple exploded wire array. With obvious modifications the model can also be applied to single wires or other self-pinched plasma columns. Each wire in the array is modeled as a plasma cylinder undergoing self-similar radial motion, and the whole array is coupled self-consistently to an external circuit. The plasma expands initially; the onset of self-pinch is shown to be coincident with the plasma conductivity reaching a value large enough for skin effect to occur. The model is run for a variety of system parameters, and the choice of machine and wire parameters to attain particular objectives (e.g., rapid current rise, limited wire expansion, etc.) is discussed.

Bloomberg, H.W.; Lampe, M.; Colombant, D.G.

1980-10-01T23:59:59.000Z

135

Strain tolerant microfilamentary superconducting wire  

DOE Patents (OSTI)

A strain tolerant microfilamentary wire capable of carrying superconducting currents is provided comprising a plurality of discontinuous filaments formed from a high temperature superconducting material. The discontinuous filaments have a length at least several orders of magnitude greater than the filament diameter and are sufficiently strong while in an amorphous state to withstand compaction. A normal metal is interposed between and binds the discontinuous filaments to form a normal metal matrix capable of withstanding heat treatment for converting the filaments to a superconducting state. The geometry of the filaments within the normal metal matrix provides substantial filament-to-filament overlap, and the normal metal is sufficiently thin to allow supercurrent transfer between the overlapped discontinuous filaments but is also sufficiently thick to provide strain relief to the filaments.

Finnemore, Douglas K. (Ames, IA); Miller, Theodore A. (Tuscon, AZ); Ostenson, Jerome E. (Ames, IA); Schwartzkopf, Louis A. (Mankato, MN); Sanders, Steven C. (Ames, IA)

1993-02-23T23:59:59.000Z

136

Improvement of Descalability of High Carbon Steel Wire Rods  

Science Conference Proceedings (OSTI)

Presentation Title, Improvement of Descalability of High Carbon Steel Wire Rods ... In the past, hydrochloric and sulfuric acids were used for the purpose of wire ...

137

Material Flow and Texture in Friction Extruded Wire  

Science Conference Proceedings (OSTI)

Presentation Title, Material Flow and Texture in Friction Extruded Wire ... conducted during friction extrusion of AA6061 wire with AA2195 as a marker insert.

138

Reliability of Copper Wire Bonding on Copper Substrate with Tin ...  

Science Conference Proceedings (OSTI)

Suitable bonding conditions, Tin thickness, stage temperature, wire bonding power and bonding time are chosen through wire bonding tests. Peel strength of a ...

139

Transient Melt Pool Response in Wire Feed Electron Beam Direct ...  

Science Conference Proceedings (OSTI)

Presentation Title, Transient Melt Pool Response in Wire Feed Electron Beam Direct ... Abstract Scope, Wire feed electron beam direct digital manufacturing ...

140

Efficiency consideration of DC link soft-switching inverters for motor drive applications  

SciTech Connect

This paper critically evaluates efficiency of soft switching inverters including an actively clamped resonant dc link inverter and a clamped-mode resonant pole inverter. An analytical approach to evaluating efficiency of the clamped-mode soft switching inverter has been developed. The evaluation results are compared with that of the standard pulse-width-modulation (PWM) inverter. A 50-kW induction motor is used as the variable load, and the inverter efficiency is evaluated under different speed and torque conditions. The clamped-mode soft-switching inverter, although eliminating the switching loss, shows poor efficiency over the entire load range. Under low load conditions, the efficiency profile is even worse. The actively clamped resonant dc link inverter shows highest efficiency over the entire speed and torque range. However, its energy saving over the standard PWM inverter is marginal under full load or high speed conditions.

Lai, J.S.; Young, R.W.; McKeever, J.W.

1994-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Association of Wire Code Configuration with Long-Term Average 60-Hz Magnetic Fields and Exposure: Data Set Documentation  

Science Conference Proceedings (OSTI)

The Long-Term Wire Code (LTWC) Study data set contains measurement data, measurement summaries, and descriptive residence and neighborhood information collected over a 42-month exposure period. The study -- designed to assess the association between wire code classification and long-term 60-Hz magnetic fields -- involved periodic measurements in a random sample of 218 homes in eight geographically diverse metropolitan areas of the United States. The data set consists of numerous data products containing ...

2000-11-13T23:59:59.000Z

142

Inverter/controller subsystem optimized for photovoltaic applications  

SciTech Connect

Conversion of solar array dc power to ac power stimulated the specification, design, and simulation testing of an inverter/controller subsystem tailored to the photovoltaic power source characteristics. The optimization of the inverter/controller design as part of an overall Photovoltaic Power System (PPS) designed for maximum energy extraction from the solar array is discussed. The special design requirements for the inverter/controller include: (1) a power system controller (PSC) to control continuously the solar array operating point at the maximum power level based on variable solar insolation and cell temperatures; and (2) an inverter designed for high efficiency at rated load and low losses at light loadings to conserve energy. It must be capable of operating connected to the utility line at a level set by an external controller (PSC). This paper is presented in three sections: (1) the overall PPS and PSC design (Utility Mode); (2) the inverter design and test results; and (3) a PPS analysis and simulation testing, conducted at LeRC to verify the design control concepts and fix design parameters.

Pickrell, R.L.; O' Sullivan, G.; Merrill, W.C.

1978-01-01T23:59:59.000Z

143

Invert/EE-Lab Website | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Invert/EE-Lab Website Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Invert/EE-Lab Website Focus Area: Renewable Energy Topics: Policy Impacts Website: www.invert.at Equivalent URI: cleanenergysolutions.org/content/invertee-lab-website Language: English Policies: "Deployment Programs,Financial Incentives,Regulations" is not in the list of possible values (Deployment Programs, Financial Incentives, Regulations) for this property. DeploymentPrograms: Project Development Regulations: Mandates/Targets This tool can be used to evaluate support schemes for renewable energy heating and cooling systems. It can help users simulate the effects of promotional programs on the energy carrier mix, CO2 reductions, and costs

144

Modeling of Ice Accretion on Wires  

Science Conference Proceedings (OSTI)

A time-dependent numerical model of ice accretion on wires, such as overhead conductors, is presented. Simulations of atmospheric icing are made with the model in order to examine the dependence of the accreted ice amount on atmospheric ...

Lasse Makkonen

1984-06-01T23:59:59.000Z

145

Inverter power module with distributed support for direct substrate cooling  

Science Conference Proceedings (OSTI)

Systems and/or methods are provided for an inverter power module with distributed support for direct substrate cooling. An inverter module comprises a power electronic substrate. A first support frame is adapted to house the power electronic substrate and has a first region adapted to allow direct cooling of the power electronic substrate. A gasket is interposed between the power electronic substrate and the first support frame. The gasket is configured to provide a seal between the first region and the power electronic substrate. A second support frame is adapted to house the power electronic substrate and joined to the first support frame to form the seal.

Miller, David Harold (San Pedro, CA); Korich, Mark D. (Chino Hills, CA); Ward, Terence G. (Redondo Beach, CA); Mann, Brooks S. (Redondo Beach, CA)

2012-08-21T23:59:59.000Z

146

Phase Conductor and Shield Wire Corrosion  

Science Conference Proceedings (OSTI)

As new inspection technologies for conductors and shield wires develop and mature, the assessment process becomes more accurate in identifying and quantifying flaws. With better accuracy, condition assessment can be less conservative, thus allowing utilities to save money by keeping conductors in service for longer periods. This report, which includes the results of a survey of EPRI member utilities on phase conductor and shield wire installations, inspections, and failures, updates recent EPRI work on c...

2007-12-20T23:59:59.000Z

147

Power Quality Improvement Methodology for Wires Companies  

Science Conference Proceedings (OSTI)

This report provides practical utility-side strategies for improving power quality. Much research has been done on the application of custom power devices to mitigate power quality events on transmission and distribution wires systems. However, these solutions can be costly and often benefit a limited number of customers. Many wires companies are looking for ways to improve the overall quality of their service using methods and equipment that are more traditional.

2003-02-11T23:59:59.000Z

148

Energetic additive manufacturing process with feed wire  

DOE Patents (OSTI)

A process for additive manufacture by energetic wire deposition is described. A source wire is fed into a energy beam generated melt-pool on a growth surface as the melt-pool moves over the growth surface. This process enables the rapid prototyping and manufacture of fully dense, near-net shape components, as well as cladding and welding processes. Alloys, graded materials, and other inhomogeneous materials can be grown using this process.

Harwell, Lane D. (Albuquerque, NM); Griffith, Michelle L. (Albuquerque, NM); Greene, Donald L. (Corrales, NM); Pressly, Gary A. (Sandia Park, NM)

2000-11-07T23:59:59.000Z

149

Pulsed electromagnetic acceleration of exploded wire plasmas  

Science Conference Proceedings (OSTI)

A simple analysis of the dynamic state of a current-conducting high-density plasma column, resulting from an exploded wire between the conductors of a rail-gun accelerator or one or more wires strung between the anode and cathode conductors in a pulsed-power generator diode, is given on the basis of a one-dimensional magnetohydrodynamics model. Spatial distributions of the current density, magnetic field, temperature, and particle density are calculated as well as the temporal current, voltage, and impedance histories. The model self-consistently treats the accelerator load transition through its solid, melt, vapor, and plasma states in the presence of its supply source and feed network. Once formed and accelerated, the plasma state calculations show expansion cooling across the self-induced magnetic field if the Bennett condition is not satisfied. The model predictions are compared to two experimental situations. The first involves the delivery of some hundreds of Joules of stored energy to the wire load. For this case, good agreement between the calculated and observed plasma state is obtained. The second situation involves the delivery of many thousands of Joules to the wire load. For this case and dependent upon the wire mass, diameter, number of wires exploded, their separation, and the pulsed energy electrical wave shapes, the magnetohydrodynamic results can be qualitatively incorrect. The necessity of an electromagnetic particle simulation approach is indicated in order to resolve the magnetic rope-like structure and filamentation observed in the very energetic plasmas.

Peratt, A.L.; Koert, P.

1983-11-01T23:59:59.000Z

150

Chemistry of radiation damage to wire chambers  

SciTech Connect

Proportional counters are used to study aspects of radiation damage to wire chambers (wire aging). Principles of low-pressure, rf plasma chemistry are used to predict the plasma chemistry in electron avalanches (1 atm, dc). (1) Aging is studied in CF{sub 4}/iC{sub 4}H{sub 10} gas mixtures. Wire deposits are analyzed by Auger electron spectroscopy. An apparent cathode aging process resulting in loss of gain rather than in a self-sustained current is observed in CF{sub 4}-rich gases. A four-part model considering plasma polymerization of the hydrocarbon, etching of wire deposits by CF{sub 4}, acceleration of deposition processes in strongly etching environments, and reactivity of the wire surface is developed to understand anode wire aging in CF{sub 4}/iC{sub 4}H{sub 10} gases. Practical guidelines suggested by the model are discussed. (2) Data are presented to suggest that trace amounts of Freons do not affect aging rates in either dimethyl ether or Ar/C{sub 2}H{sub 6}. Apparent loss of gain is explained by attachment of primary electrons to a continuously increasing concentration of Freon 11 (CCl{sub 3}F) in the counter gas. An increase in the concentration of Freon 11 in dimethyl ether is caused by a distillation process in the gas supply bottle and is a natural consequence of the unequal volatilities of the two compounds.

Wise, J.

1992-08-01T23:59:59.000Z

151

Efficiency modeling and evaluation of a resonant snubber based soft- switching inverter for motor drive applications  

SciTech Connect

This paper establishes an analytical model for a resonant snubber based soft-switching inverter. The model adopts loss separation method to evaluate losses in individual components. Because of symmetry of the inverter circuit, the developed model is suitable for both single-phase and three-phase inverters. A single-phase inverter was built and tested with a single-phase induction motor driving a fan load to verify the developed model. The equivalent single-phase induction motor model was curve-fitted from experiment. Analytical results showed reasonable agreement with experiment. The same efficiency evaluation method was then applied to the conventional hard-switching inverter, and the results were compared with that of the soft-switching inverter. The resonant snubber base soft-switching inverter shows substantial efficiency improvement over the hard switching PWM (pulse-width-modulation) inverter, especially in low speed operation.

Lai, J.S.; Young, R.W.; Ott, G.W.

1995-12-31T23:59:59.000Z

152

A multilevel voltage-source inverter with separate dc sources for static var generation  

SciTech Connect

A new multilevel voltage-source inverter with a separate dc sources is proposed for high-voltage, high-power applications, such as flexible ac transmission systems (FACTS) including static var generation (SVG), power line conditioning, series compensation, phase shifting, voltage balancing, fuel cell and photovoltaic utility systems interfacing, etc. The new M-level inverter consists of (M-1)/2 single phase full bridges in which each bridge has its own separate dc source. This inverter can generate almost sinusoidal waveform voltage with only one time switching per cycle as the number of levels increases. It can solve the problems of conventional transformer-based multipulse inverters and the problems of the multilevel diode-clamped inverter and the multilevel flying capacitor inverter. To demonstrate the superiority of the new inverter, a SVG system using the new inverter topology is discussed through analysis, simulation and experiment.

Peng, Fang Zheng [Tennessee Univ., Knoxville, TN (United States)]|[Oak Ridge National Lab., TN (United States); Lai, Jih-Sheng; McKeever, J.; VanCoevering, J. [Oak Ridge National Lab., TN (United States)

1995-09-01T23:59:59.000Z

153

Acoustical Measurement of Nonlinear Internal Waves Using the Inverted Echo Sounder  

Science Conference Proceedings (OSTI)

The performance of pressure sensor–equipped inverted echo sounders for monitoring nonlinear internal waves is examined. The inverted echo sounder measures the round-trip acoustic travel time from the sea floor to the sea surface and thus acquires ...

Qiang Li; David M. Farmer; Timothy F. Duda; Steve Ramp

2009-10-01T23:59:59.000Z

154

CRADA Final Report for CRADA Number ORNL98-0521 : Development of an Electric Bus Inverter Based on ORNL Auxiliary Resonant Tank (ART) Soft-Switching Technology  

SciTech Connect

The Power Electronics and Electric Machinery Research Center (PEEMRC) of Oak Ridge National Laboratory (ORNL) has for many years been developing technologies for power converters for motor drives and many other applications. Some of the research goals are to improve efficiency and reduce audible and electromagnetic interference noise generation for inverters and the driven loads. The converters are being required to produce more power with reduced weight and volume, which requires improvements in heat removal from the electronics, as well as improved circuit designs that have fewer electrical losses. PEEMRC has recently developed and patented a soft-switching inverter topology called an Auxiliary Resonant Tank (ART), and this design has been tested and proven at ORNL using a 10-kW laboratory prototype. The objective of this project was to develop, test, and install the ART inverter technology in an electric transit bus with the final goal of evaluating performance of the ORNL inverter under field conditions in a vehicle. A scaled-up inverter with the capacity to drive a 22-e bus was built based on the 10-kW ORNL laboratory prototype ART soft-switching inverter. Most (if not all) commercially available inverters for traction drive and other applications use hard-switching inverters. A Cooperative Research and Development Agreement was established with the Chattanooga Area Regional Transit Authority (CARTA), the Electric Transit Vehicle Institute (ETVI), and Advanced Vehicle Systems (AVS), all of Chattanooga, along with ORNL. CARTA, which maintains and operates the public transit system in Chattanooga, provided an area for testing the vehicle alongside other similar vehicles in the normal operating environment. ETVI offers capabilities in standardized testing and reporting and also provides exposure in the electric transit vehicle arena for ORNL's technologies. The third Chattanooga partner, (AVS) manufactures all-electric and hybrid electric transit buses using inverter drive systems from several manufacturers. AVS provided help in field installation, and parts for laboratory testing. A 100-kW field-ready unit was developed, tested in an ORNL laboratory, and installed and successfully operated in a CARTA bus in Chattanooga. The tests on the vehicle were performed at a CARTA maintenance facility and at a l-mile test track in Chattanooga managed by CARTA.

Ayers, C.W.

2001-05-08T23:59:59.000Z

155

High voltage power supply with modular series resonant inverters  

DOE Patents (OSTI)

A relatively small and compact high voltage, high current power supply for a laser utilizes a plurality of modules containing series resonant half bridge inverters. A pair of reverse conducting thyristors are incorporated in each series resonant inverter module such that the series resonant inverter modules are sequentially activated in phases 360.degree./n apart, where n=number of modules for n>2. Selective activation of the modules allows precise output control reducing ripple and improving efficiency. Each series resonant half bridge inverter module includes a transformer which has a cooling manifold for actively circulating a coolant such as water, to cool the transformer core as well as selected circuit elements. Conductors connecting and forming various circuit components comprise hollow, electrically conductive tubes such as copper. Coolant circulates through the tubes to remove heat. The conductive tubes act as electrically conductive lines for connecting various components of the power supply. Where it is desired to make electrical isolation breaks, tubes comprised of insulating material such as nylon are used to provide insulation and continue the fluid circuit.

Dreifuerst, Gary R. (Livermore, CA); Merritt, Bernard T. (Livermore, CA)

1995-01-01T23:59:59.000Z

156

High voltage power supply with modular series resonant inverters  

DOE Patents (OSTI)

A relatively small and compact high voltage, high current power supply for a laser utilizes a plurality of modules containing series resonant half bridge inverters. A pair of reverse conducting thyristors are incorporated in each series resonant inverter module such that the series resonant inverter modules are sequentially activated in phases 360{degree}/n apart, where n=number of modules for n>2. Selective activation of the modules allows precise output control reducing ripple and improving efficiency. Each series resonant half bridge inverter module includes a transformer which has a cooling manifold for actively circulating a coolant such as water, to cool the transformer core as well as selected circuit elements. Conductors connecting and forming various circuit components comprise hollow, electrically conductive tubes such as copper. Coolant circulates through the tubes to remove heat. The conductive tubes act as electrically conductive lines for connecting various components of the power supply. Where it is desired to make electrical isolation breaks, tubes comprised of insulating material such as nylon are used to provide insulation and continue the fluid circuit. 11 figs.

Dreifuerst, G.R.; Merritt, B.T.

1995-07-18T23:59:59.000Z

157

Modelling and Control of an Inverted Pendulum Turbine  

E-Print Network (OSTI)

. In this project the feasibility of a new kind of wind turbine is studied. This thesis deals with the achievement of getting a proper mathematical model of a new kind of wind turbine, called the inverted pendulum turbine is inherently unstable system. In order to control this wind turbine an optimal control has been investigated

158

Review of PV Inverter Technology Cost and Performance Projections  

DOE Green Energy (OSTI)

The National Renewable Energy Laboratory (NREL) has a major responsibility in the implementation of the U.S. Department of Energy's (DOE's) Solar Energy Technologies Program. Sandia National Laboratories (SNL) has a major role in supporting inverter development, characterization, standards, certifications, and verifications. The Solar Energy Technologies Program recently published a Multiyear Technical Plan, which establishes a goal of reducing the Levelized Energy Cost (LEC) for photovoltaic (PV) systems to $0.06/kWh by 2020. The Multiyear Technical Plan estimates that, in order to meet the PV system goal, PV inverter prices will need to decline to $0.25-0.30 Wp by 2020. DOE determined the need to conduct a rigorous review of the PV Program's technical and economic targets, including the target set for PV inverters. NREL requested that Navigant Consulting Inc.(NCI) conduct a review of historical and projected cost and performance improvements for PV inverters, including identification of critical barriers identified and the approaches government might use to address them.

Navigant Consulting Inc.

2006-01-01T23:59:59.000Z

159

Modeling the Overshooting Effect for CMOS Inverter in Nanometer Technologies  

Science Conference Proceedings (OSTI)

With the scaling of CMOS technology, the over-shooting time due to the input-to-output coupling capacitance has much more significant effect on inverter delay. Moreover, the overshooting time is also an important parameter in the short circuit power ...

Zhangcai Huang; Hong Yu; Atsushi Kurokawa; Yasuaki Inoue

2007-01-01T23:59:59.000Z

160

Mono inverter Multi parallel PMSM -Structure and Control strategy  

E-Print Network (OSTI)

a new and original Mono inverter Multi parallel Permanent Magnet Synchronous Motor (PMSM) system. To obtain the stability of such a system, each of the motor synchronisms should always be respected regardless of their load torque. In this case, only one motor, called "master motor", will be self

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Review of PV Inverter Technology Cost and Performance Projections  

SciTech Connect

The National Renewable Energy Laboratory (NREL) has a major responsibility in the implementation of the U.S. Department of Energy's (DOE's) Solar Energy Technologies Program. Sandia National Laboratories (SNL) has a major role in supporting inverter development, characterization, standards, certifications, and verifications. The Solar Energy Technologies Program recently published a Multiyear Technical Plan, which establishes a goal of reducing the Levelized Energy Cost (LEC) for photovoltaic (PV) systems to $0.06/kWh by 2020. The Multiyear Technical Plan estimates that, in order to meet the PV system goal, PV inverter prices will need to decline to $0.25-0.30 Wp by 2020. DOE determined the need to conduct a rigorous review of the PV Program's technical and economic targets, including the target set for PV inverters. NREL requested that Navigant Consulting Inc.(NCI) conduct a review of historical and projected cost and performance improvements for PV inverters, including identification of critical barriers identified and the approaches government might use to address them.

Navigant Consulting Inc.

2006-01-01T23:59:59.000Z

162

Calibrating Inverted Echo Sounders Equipped with Pressure Sensors  

Science Conference Proceedings (OSTI)

The addition of an accurate pressure sensor to the inverted echo sounder (IES) has allowed for the development of a new method for calibrating the IES’s acoustic travel-time record without the need for coincident conductivity–temperature–depth (...

Christopher S. Meinen; D. Randolph Watts

1998-12-01T23:59:59.000Z

163

An Autonomously Recording Inverted Echo Sounder: ARIES II  

Science Conference Proceedings (OSTI)

A self-contained instrument, the Autonomously Recording Inverted Echo Sounder (ARIES II), carrying two 250-kHz beam side-scan sonars and with the capacity to record sonar data sampled at 3.2 kHz for 168 h with the sonars operating with a pulse ...

S. A. Thorpe; M. J. Ulloa; D. Baldwin; A. J. Hall

1998-12-01T23:59:59.000Z

164

Nonlinear Control Techniques in Uninterruptible Power Supply Inverter: A Review  

Science Conference Proceedings (OSTI)

Summarizes the basic objectives of controllers for UPS system are tracking ability and robustness. To get this aims, many controllers have been proposed in the literature. In this paper a comprehensive review of the nonlinear control techniques of UPS ... Keywords: inverter, uninterruptible power supply, control techniques

Ghazanfar Shahgholian; Jawad Faiz; Pegah Shafaghi

2009-12-01T23:59:59.000Z

165

Optimized Triple-Junction Solar Cells Using Inverted Metamorphic Approach (Presentation)  

DOE Green Energy (OSTI)

Record efficiencies with triple-junction inverted metamorphic designs, modeling useful to optimize, and consider operating conditions before choosing design.

Geisz, J. F.

2008-11-01T23:59:59.000Z

166

Synchronization and power sharing for droop-controlled inverters in islanded microgrids  

Science Conference Proceedings (OSTI)

Motivated by the recent and growing interest in smart grid technology, we study the operation of DC/AC inverters in an inductive microgrid. We show that a network of loads and DC/AC inverters equipped with power-frequency droop controllers can be cast ... Keywords: Coupled oscillators, Distributed control, Inverters, Kuramoto model, Power-system control, Smart power applications, Synchronization

John W. Simpson-Porco, Florian DöRfler, Francesco Bullo

2013-09-01T23:59:59.000Z

167

Annual Coded-Wire Tag Program : Washington : Missing Production Groups Annual Report for 2000.  

DOE Green Energy (OSTI)

The Bonneville Power Administration (BPA) funds the 'Annual Coded-wire Tag Program - Missing Production Groups for Columbia River Hatcheries' project. The Washington Department of Fish and Wildlife (WDFW), Oregon Department of Fish and Wildlife (ODFW) and the United States Fish and Wildlife Service (USFWS) all operate salmon and steelhead rearing programs in the Columbia River basin. The intent of the funding is to coded-wire tag at least one production group of each species at each Columbia Basin hatchery to provide a holistic assessment of survival and catch distribution over time and to meet various measures of the Northwest Power Planning Council's (NWPPC) Fish and Wildlife Program. The WDFW project has three main objectives: (1) coded-wire tag at least one production group of each species at each Columbia Basin hatchery to enable evaluation of survival and catch distribution over time, (2) recover coded-wire tags from the snouts of fish tagged under objective 1 and estimate survival, contribution, and stray rates for each group, and (3) report the findings under objective 2 for all broods of chinook, and coho released from WDFW Columbia Basin hatcheries. Objective 1 for FY-00 was met with few modifications to the original FY-00 proposal. Under Objective 2, snouts containing coded-wire tags that were recovered during FY-00 were decoded. Under Objective 3, this report summarizes available recovery information through 2000 and includes detailed information for brood years 1989 to 1994 for chinook and 1995 to 1997 for coho.

Mills, Robin D.

2002-02-01T23:59:59.000Z

168

Electrical power inverter having a phase modulated, twin-inverter, high frequency link and an energy storage module  

SciTech Connect

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output frequency that is substantially the same as the first output frequency. The second AC voltage is out of phase with the first AC voltage by a selected angular phase displacement. A mixer mixes the first and second output voltages to produce a high frequency carrier which has a selected base frequency impressed on the sidebands thereof. A rectifier rectifies the carrier, and a filter filters the rectified carrier. An output inverter inverts the filtered carrier to produce an AC line voltage at the selected base frequency. A phase modulator adjusts the relative angular phase displacement between the outputs of the first and second high frequency modules to control the base frequency and magnitude of the AC line voltage.

Pitel, Ira J. (Whippany, NJ)

1987-02-03T23:59:59.000Z

169

Electrical power inverter having a phase modulated, twin-inverter, high frequency link and an energy storage module  

SciTech Connect

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output frequency that is substantially the same as the first output frequency. The second AC voltage is out of phase with the first AC voltage by a selected angular phase displacement. A mixer mixes the first and second output voltages to produce a high frequency carrier which has a selected base frequency impressed on the sidebands thereof. A rectifier rectifies the carrier, and a filter filters the rectified carrier. An output inverter inverts the filtered carrier to produce an AC line voltage at the selected base frequency. A phase modulator adjusts the relative angular phase displacement between the outputs of the first and second high frequency modules to control the base frequency and magnitude of the AC line voltage. 19 figs.

Pitel, I.J.

1987-02-03T23:59:59.000Z

170

Speed Control of Multi Level Inverter Designed DC Series Motor with Neuro-Fuzzy Controllers  

E-Print Network (OSTI)

This paper describes the speed control of a DC series motor for an accurate and high-speed performance. A neural network based controlling operation with fuzzy modeling is suggested in this paper. The driver units of these machines are designed with a Multi-level inverter operation and are controlled by a common current control mechanism for an accurate and efficient driving technique for DC series motor. The neuro-fuzzy logic control technique is introduced to eliminate uncertainties in the plant parameters of the DC Series motors, and also considered as potential candidate for different applications to prove adequacy of the proposed control algorithm through simulations. The simulation result with such an approach is made and observed efficient over other controlling technique.

MadhusudhanaRao, G

2009-01-01T23:59:59.000Z

171

Method of fabricating composite superconducting wire  

DOE Patents (OSTI)

An improvement in the method for preparing composite rods of superconducting alloy and normal metal from which multifilament composite superconducting wire is fabricated by bending longitudinally a strip of normal metal around a rod of superconductor alloy and welding the edges to form the composite rod. After the rods have preferably been provided with a hexagonal cross-sectional shape, a plurality of the rods are stacked into a normal metal extrusion can, sealed and worked to reduce the cross-sectional size and form multifilament wire. Diffusion barriers and high-electrical resistance barriers can easily be introduced into the wire by plating or otherwise coating the faces of the normal metal strip with appropriate materials.

Strauss, Bruce P. (Downers Grove, IL); Reardon, Paul J. (Princeton, NJ); Remsbottom, Robert H. (Middleton, WI)

1977-01-01T23:59:59.000Z

172

Unit Conversion  

Science Conference Proceedings (OSTI)

Unit Conversion. ... Unit Conversion Example. "If you have an amount of unit of A, how much is that in unit B?"; Dimensional Analysis; ...

2012-12-04T23:59:59.000Z

173

Impact of inverter station on torsional dynamics of parallel HVdc-ac power system  

SciTech Connect

This paper investigates the impact of an inverter station on the torsional dynamics of a turbine-generator set which is located at the rectifier side of a parallel HVdc-ac power system. The studies show that depending on the stiffness of the inverter ac bus and electrical coupling between the inverter and rectifier ac buses, the inverter closed loop control can have noticeable contribution to the instability of torsional dynamics. This adverse torsional impact is observed in the study results even when the inverter ac bus is fairly strong (ESCR larger than 5.0).

Iravani, M.R.; Zhao, Z.; Hamouda, R.M. (Univ. of Toronto, Ontario (Canada). Dept. of Electrical Engineering)

1993-08-01T23:59:59.000Z

174

LANSCE Wire Scanner System Prototype: Switchyard Test  

Science Conference Proceedings (OSTI)

On November 19, 2011, the beam diagnostics team of Los Alamos National Laboratory's LANSCE accelerator facility conducted a test of a prototype wire scanner system for future deployment within the accelerator's switchyard area. The primary focus of this test was to demonstrate the wire scanner control system's ability to extend its functionality beyond acquiring lower energy linac beam profile measurements to acquiring data in the switchyard. This study summarizes the features and performance characteristics of the electronic and mechanical implementation of this system with details focusing on the test results.

Sedillo, James D [Los Alamos National Laboratory

2012-04-11T23:59:59.000Z

175

GAP analysis towards a design qualification standard development for grid-connected photovoltaic inverters.  

SciTech Connect

A dedicated design qualification standard for PV inverters does not exist. Development of a well-accepted design qualification standard, specifically for PV inverters will significantly improve the reliability and performance of inverters. The existing standards for PV inverters such as ANSI/UL 1741 and IEC 62109-1 primarily focus on safety of PV inverters. The IEC 62093 discusses inverter qualification but it includes all the BOS components. There are other general standards for distributed generators including the IEEE 1547 series of standards which cover major concerns like utility integration but they are not dedicated to PV inverters and are not written from a design qualification point of view. In this paper some of the potential requirements for a design qualification standard for PV inverters are addressed. The missing links in existing PV inverter related standards are identified and with the IEC 62093 as a guideline, the possible inclusions in the framework for a dedicated design qualification standard of PV inverter are discussed. Some of the key missing links are related to electric stress tests. Hence, a method to adapt the existing surge withstand test standards for use in design qualification standard of PV inverter is presented.

Tamizhmani, Govindasamy (Arizona State University, Tempe, AZ); Granata, Jennifer E.; Maracas, George (Arizona State University, Tempe, AZ); Ayyanar, Raja (Arizona State University, Tempe, AZ); Marinella, Matthew; Venkataramanan, Sai Balasubramanian Alampoondi (Arizona State University, Tempe, AZ)

2011-06-01T23:59:59.000Z

176

Dynamic performance and control of a static var generator using cascade multilevel inverters  

SciTech Connect

A cascade multilevel inverter is proposed for static VAR shifting, compensation/generation applications. The new cascade M-level inverter consists of (M-1)/2 single-phase full bridges in which each bridge has its own separate dc source. This inverter can generate almost sinusoidal waveform voltage with only one time switching per cycle. It can eliminate the need for transformers in multipulse inverters. A prototype static VAR generator (SVG) system using 11- level cascade inverter (21-level line-to-line voltage waveform) has been built. The output voltage waveform is equivalent to that of a 60- pulse inverter. This paper focuses on dynamic performance of the cascade inverter based SVG system. Control schemes are proposed to achieve a fast response which is impossible for a conventional static VAR compensator (SVC). Analytical, simulated and experimental results show the superiority of the proposed SVG system.

Peng, Fang Zheng [Tennessee Univ., Knoxville, TN (United States); Lai, Jih-Sheng [Oak Ridge National Lab., TN (United States)

1996-10-01T23:59:59.000Z

177

PWM Inverter control and the application thereof within electric vehicles  

DOE Patents (OSTI)

An inverter (34) which provides power to an A.C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A.C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A.C. machine is optimized. The control circuit includes a micro-computer and memory element which receive various parametric inputs and calculate optimized machine control data signals therefrom. The control data is asynchronously loaded into the inverter through an intermediate buffer (38). In its preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack (32) and a three-phase induction motor (18).

Geppert, Steven (Bloomfield Hills, MI)

1982-01-01T23:59:59.000Z

178

united stadium. united station.  

E-Print Network (OSTI)

??DC United is one of Major League Soccerâs most decorated franchises, yet it still plays its home games within the crumbling confines of RFK Stadium.… (more)

Groff, David R.

2011-01-01T23:59:59.000Z

179

Seismic Qualification Case Study for a New Inverter  

Science Conference Proceedings (OSTI)

This report reviews and compares methods used for the seismic qualification of safety related equipment at nuclear power plants and examines an alternative, hybrid approach. The report investigates the costs and lead times for each seismic qualification approach and also discusses the seismic capacity definitions that result from the application of each qualification approach. The report includes a case study that applies the new approach to the seismic qualification of an inverter.

2007-12-17T23:59:59.000Z

180

Conventional and fuzzy PI control of voltage-source inverter-fed induction motor drive for electric vehicle  

Science Conference Proceedings (OSTI)

Keywords: adaptive control, control algorithm, electric vehicle, fuzzy control, inverter drive system

Tadeusz Stefanski

1995-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Xcel Energy - Farm Re-Wiring Loan Program (Wisconsin) | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Re-Wiring Loan Program (Wisconsin) Xcel Energy - Farm Re-Wiring Loan Program (Wisconsin) Eligibility Agricultural Savings For Other Maximum Rebate 23,000 loan maximum Can be...

182

Media Center - Argonne Partners with Delphi on Inverter  

NLE Websites -- All DOE Office Websites (Extended Search)

Argonne part of Delphi-led team to reduce cost, size of hybrid vehicle component Argonne part of Delphi-led team to reduce cost, size of hybrid vehicle component Argonne is part of a Delphi Corp.-led team that has been selected by the U.S. Department of Energy to develop the next-generation propulsion inverter for hybrid vehicles, according to an announcement by Delphi earlier this week. The project is valued at $8 million, with DOE providing $5 million and the Delphi team contributing $3 million. The team's aim is to reduce the size and cost of the inverter for electric propulsion systems by 50 percent or more. Propulsion invertors supply phased alternating current power for hybrid traction motors and generators, and enable exact control of electrical power flow from the battery to the electric motor. The small inverter would cost less and be used in the next-generation high-efficiency hybrid electric and plug-in hybrids vehicles, as well as in fuel cell-powered vehicles in the longer-term.

183

Magnet Wire Plant Resolves PQ Issues  

Science Conference Proceedings (OSTI)

This case study presents an example of a magnet wire plant that was subject to a number of power quality (PQ) disturbances. These disturbances were severe enough to upset several manufacturing lines. A detailed audit revealed that the plant could be hardened to PQ disturbances using simple-to-implement, low-cost techniques.

2007-12-31T23:59:59.000Z

184

Porous coatings from wire mesh for bone implants  

DOE Patents (OSTI)

A method of coating areas of bone implant elements and the resulting implant having a porous coating are described. Preselected surface areas are covered by a preform made from continuous woven lengths of wire. The preform is compressed and heated to assure that diffusion bonding occurs between the wire surfaces and between the surface boundaries of the implant element and the wire surfaces in contact with it. Porosity is achieved by control of the resulting voids between the bonded wire portions.

Sump, Kenneth R. (Richland, WA)

1986-01-01T23:59:59.000Z

185

Nuclear Maintenance Applications Center: Wire Brush and Alternatives Selection Matrix  

Science Conference Proceedings (OSTI)

The purpose of this product is to provide maintenance personnel guidance regarding the suitability of various non-wire filament brush products for different applications in the plant. The objective of the Wire Brush and Alternatives Selection Matrix is to provide recommendations and encourage the use of products in lieu of wire brushes. The recommendations in the matrix were developed based on the testing described EPRI report 1022273, Wire Brush Testing, Procurement and Usage Guide, and recommendations ...

2010-12-23T23:59:59.000Z

186

Transient Melt Pool Response in Wire Feed Additive Manufacturing ...  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials, Processes and Applications for Additive Manufacturing ... Lubricants in Deposition and Machining of Wire and Arc Additive ...

187

Development program for 3. 0 kW inverter. Militarized inverter for use with fuel cell or battery power plants. Final report, December 1976--December 1978  

SciTech Connect

This report describes the design, construction and testing of a static inverter rated at 3.0 kilowatts. Circuit techniques were evaluated to obtain desired results with considerations to cost, reliability, maintainability, weight, size and efficiency. The application of this portable, rugged inverter is to replace mechanical alternating generators used in the field.

Rance, J.E.

1979-01-15T23:59:59.000Z

188

Grid Impacts of Distributed Generation with Advanced Inverter Functions: Hosting Capacity of Large-Scale Solar Photovoltaic Using Smart Inverters  

Science Conference Proceedings (OSTI)

With increasing penetration levels of solar photovoltaics (PV), the need for inverter technology to provide grid support has become more and more critical. Since 2009, the Electric Power Research Institute (EPRI) and industry partners have been working to establish a common set of functions that can provide such capability. The development of a common set of functions is complete; however, very little work to date has addressed the impact that these common functions will have on grid performance, ...

2013-12-20T23:59:59.000Z

189

Composite wire microelectrode and method of making same  

DOE Patents (OSTI)

A composite wire microelectrode for making electro-chemical measurements, and method of making same, are disclosed. The microelectrode includes an inner conductive sensing wire and an outer tube that is oxidized to form a dielectric, self-healing oxide layer around the sensing wire. 4 figs.

Isaacs, H.S.; Aldykiewicz, A.J. Jr.

1996-12-03T23:59:59.000Z

190

Wire-Extrusion Process Disrupted By Voltage Sags  

Science Conference Proceedings (OSTI)

This PQTN Case Study investigates voltage sags originating from a utility distribution system at a wire-extrusion plant near Cleveland, Ohio that were causing a wire-drawing process to malfunction, resulting in broken tungsten wire and hours of time spent restarting the manufacturing process.

2003-12-31T23:59:59.000Z

191

Composite wire microelectrode and method of making same  

DOE Patents (OSTI)

A composite wire microelectrode for making electro-chemical measurements, and method of making same. The microelectrode includes an inner conductive sensing wire and an outer tube that is oxidized to form a dielectric, self-healing oxide layer around the sensing wire.

Isaacs, Hugh S. (Shoreham, NY); Aldykiewicz, Jr., Antonio J. (Thiells, NY)

1996-12-03T23:59:59.000Z

192

Association of Wire Code Configuration With Long-Term Average 60-Hz Magnetic Fields and Exposure  

Science Conference Proceedings (OSTI)

Previous studies have reported associations between cancer and the configuration of outdoor electric utility lines, popularly referred to as the wire code, which were developed as a surrogate for time-weighted-average (TWA) exposure to magnetic fields. A study was conducted to measure the magnetic fields in over 200 houses in eight areas within the contiguous United States. This interim report presents the major results of that study.

1998-12-16T23:59:59.000Z

193

High density harp or wire scanner for particle beam diagnostics  

DOE Patents (OSTI)

A diagnostic detector head harp (23) used to detect and characterize high energy particle beams using an array of closely spaced detector wires (21), typically carbon wires, spaced less than 0.1 cm (0.040 inch) connected to a hybrid microcircuit (25) formed on a ceramic substrate (26). A method to fabricate harps (23) to obtain carbon wire spacing and density not previously available utilizing hybrid microcircuit technology. The hybrid microcircuit (25) disposed on the ceramic substrate (26) connects electrically between the detector wires (21) and diagnostic equipment (37) which analyzes pulses generated in the detector wires (21) by the high energy particle beams.

Fritsche, Craig T. (Overland Park, KS); Krogh, Michael L. (Lee' s Summit, MO)

1996-05-21T23:59:59.000Z

194

Utility-scale grid-tied PV inverter reliability workshop summary report.  

DOE Green Energy (OSTI)

A key to the long-term success of the photovoltaic (PV) industry is confidence in the reliability of PV systems. Inverters are the most commonly noted cause of PV system incidents triggered in the field. While not all of these incidents are reliability-related or even necessarily failures, they still result in a loss of generated power. With support from the U.S. Department of Energy's Solar Energy Technologies Program, Sandia National Laboratories organized a Utility-Scale Grid-Tied Inverter Reliability Workshop in Albuquerque, New Mexico, January 27-28, 2011. The workshop addressed the reliability of large (100-kilowatt+) grid-tied inverters and the implications when such inverters fail, evaluated inverter codes and standards, and provided discussion about opportunities to enhance inverter reliability. This report summarizes discussions and presentations from the workshop and identifies opportunities for future efforts.

Granata, Jennifer E.; Quintana, Michael A.; Tasca, Coryne Adelle (SRA International, Inc., Fairfax, VA); Atcitty, Stanley

2011-07-01T23:59:59.000Z

195

Utility-scale grid-tied PV inverter reliability workshop summary report.  

SciTech Connect

A key to the long-term success of the photovoltaic (PV) industry is confidence in the reliability of PV systems. Inverters are the most commonly noted cause of PV system incidents triggered in the field. While not all of these incidents are reliability-related or even necessarily failures, they still result in a loss of generated power. With support from the U.S. Department of Energy's Solar Energy Technologies Program, Sandia National Laboratories organized a Utility-Scale Grid-Tied Inverter Reliability Workshop in Albuquerque, New Mexico, January 27-28, 2011. The workshop addressed the reliability of large (100-kilowatt+) grid-tied inverters and the implications when such inverters fail, evaluated inverter codes and standards, and provided discussion about opportunities to enhance inverter reliability. This report summarizes discussions and presentations from the workshop and identifies opportunities for future efforts.

Granata, Jennifer E.; Quintana, Michael A.; Tasca, Coryne Adelle (SRA International, Inc., Fairfax, VA); Atcitty, Stanley

2011-07-01T23:59:59.000Z

196

Evaluation of Three-Phase Photovoltaic Inverters with Grid Support Functionality  

Science Conference Proceedings (OSTI)

Photovoltaic (PV) inverters are capable of providing grid-friendly functionalities, including reactive current support, active power control, frequency-watt control, and ride through for abnormal grid voltage. This technical update presents laboratory test results of two three-phase inverters with several of these grid support functionalities enabled. The inverters tested in this project are Sunny Tripower 10000TL from SMA Germany and the PVI 82KW from Solectria Renewables, LLC. Sunny Tripower is ...

2012-11-30T23:59:59.000Z

197

Conductor and Shield Wire Inspection and Assessment  

Science Conference Proceedings (OSTI)

With thousands of miles of transmission lines nearing the end of their expected service life, conductor life and reliability are of increasing concern to many utilities. The consequences of conductor failure can be significant and its impacts widespread. ACSR conductors have been identified as the most problematic of all the conductors because the conductor core cannot be assessed visually. ACSR conductors have a steel stranded core to carry the wire tension load and two or more layers of aluminum strand...

2008-12-10T23:59:59.000Z

198

A Generalized Inverter Control Method for a Variable Speed Wind Power System Under Unbalanced Operting Conditions.  

E-Print Network (OSTI)

??This thesis presents a generalized control method for complete harmonic elimination and adjustable power factor of a grid side inverter under unbalanced operating conditions used… (more)

Wu, Shuang

2010-01-01T23:59:59.000Z

199

Energy Capture Improvement of a Solar PV System Using a Multilevel Inverter.  

E-Print Network (OSTI)

??The challenges with solar energy extraction are addressed in the proposed approach through development and demonstration of multilevel inverter architecture and the associated control algorithms.… (more)

Mahmud, Nayeem

2011-01-01T23:59:59.000Z

200

Integral inverter/battery charger for use in electric vehicles. Final report  

SciTech Connect

The design and test results of a thyristor based inverter/charger are discussed. A battery charger is included integral to the inverter by using a subset of the inverter power circuit components. The resulting charger provides electrical isolation between the vehicle propulsion battery and ac line and is capable of charging a 25 kWh propulsion battery in 8 hours from a 220 volt ac line. The integral charger employs the inverter commutation components as a resonant ac/dc isolated converter rated at 3.6 kW. Charger efficiency and power factor at an output power of 3.6 kW are 86% and 95%, respectively. The inverter, when operated with a matching polyphase ac induction motor and nominal 132 volt propulsion battery, can provide a peak shaft power of 34 kW (45 hp) during motoring operation and 45 kW (60 hp) during regeneration. Thyristors are employed for the inverter power switching devices and are arranged in an input-commutated topology. This configuration requires only two thyristors to commutate the six main inverter thyristors. Inverter efficiency during motoring operation at motor shaft speeds above 450 rad/sec (4300 rpm) is 92 to 94% for output power levels above 11 KW (15 hp). The combined ac inverter/charger package weighs 47 kg (103 lbs).

Thimmesch, D.

1983-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Mathematical model for the bridge-type auxiliary impulse commutated power inverter  

SciTech Connect

This paper presents analytical picture for the utilization of the auxiliary impulse commutated inverter in connection with various direct energy conversion devices. To ensure effective inversion, V-A switching characteristics as well as power handling capacities with respect to interconnected modules have to be matched with loading conditions at the inverter output. Mathematical model for this inverter could be used as the basic criterion for expressing the time varying voltage output with respect to the specific applied from the direct energy conversion device. Pure sinusoidal inverter output voltage could be secured through total neutralization of impulse and DC components by filtering.

Denno, K.

1980-12-01T23:59:59.000Z

202

A new current source GTO inverter with sinusoidal output voltage and current  

SciTech Connect

A new current source inverter with sinusoidal output voltage and current is presented. Gate turn-off thyristors (GTO's) and pulsewidth modulation (PWM) control techniques are used in the current source inverter to produce the sinusoidal output voltage and current. Three capacitors are connected to the ac output terminals to absorb overvoltages which occur when the GTO current is cut off and to provide a filter function for reducing harmonics in the output current. Voltage spikes, which have been a serious problem in the practical application of this inverter, are suppressed by adding gate pulses which force the inverter into a state of shoot-through. Moreover, this inverter permits the capacitance of an ac output terminal capacitor for absorbing overvoltages to be reduced to one-tenth or less of that of a commutating capacitor in a conventional thyristor type current source inverter. A 3.7-kW induction motor is driven by the inverter. The motor efficiency and noise level are measured and compared with those obtained when the motor is driven by a conventional voltage source PWM inverter. An operating efficiency five or six percent higher and noise level 10 dB lower are obtained for the former. Therefore, this current source GTO inverter is very suitable for ac motor variable speed drives.

Hombu, M.; Matsuda, Y.; Ueda, A.; Ueda, S.

1985-09-01T23:59:59.000Z

203

Electrical Core Transformer for Grid Improvement Incorporating Wire Magnetic Components  

SciTech Connect

The research reported herein adds to the understanding of oil-immersed distribution transformers by exploring and demonstrating potential improvements in efficiency and cost utilizing the unique Buswell approach wherein the unit is redesigned, replacing magnetic sheet with wire allowing for improvements in configuration and increased simplicity in the build process. Exploration of new designs is a critical component in our drive to assure reduction of energy waste, adequate delivery to the citizenry, and the robustness of U.S. manufacturing. By moving that conversation forward, this exploration adds greatly to our base of knowledge and clearly outlines an important avenue for further exploration. This final report shows several advantages of this new transformer type (outlined in a report signed by all of our collaborating partners and included in this document). Although materials development is required to achieve commercial potential, the clear benefits of the technology if that development were a given is established. Exploration of new transformer types and further work on the Buswell design approach is in the best interest of the public, industry, and the United States. Public benefits accrue from design alternatives that reduce the overall use of energy, but it must be acknowledged that new DOE energy efficiency standards have provided some assurance in that regard. Nonetheless the burden of achieving these new standards has been largely shifted to the manufacturers of oil-immersed distribution transformers with cost increasing up to 20% of some units versus 2006 when this investigation was started. Further, rising costs have forced the industry to look closely are far more expensive technologies which may threaten U.S. competitiveness in the distribution transformer market. This concern is coupled with the realization that many units in the nation's grid are beyond their optimal life which suggests that the nation may be headed for an infrastructure crisis that U.S. industry is ill prepared to handle which could further challenge U.S. competitiveness.

Harrie R. Buswell, PhD; Dennis Jacobs, PhD; Steve Meng

2012-03-26T23:59:59.000Z

204

Fault Current Contribution from Single-Phase PV Inverters  

DOE Green Energy (OSTI)

A significant increase in photovoltaic (PV) system installations is expected to come on line in the near future and as the penetration level of PV increases, the effect of PV may no longer be considered minimal. One of the most important attributions of additional PV is what effect this may have on protection systems. Protection engineers design protection systems to safely eliminate faults from the electric power system. One of the new technologies recently introduced into the electric power system are distributed energy resources (DER). Currently, inverter-based DER contributes very little to the power balance on all but a few utility distribution systems. As DER become prevalent in the distribution system, equipment rating capability and coordination of protection systems merit a closer investigation. A collaborative research effort between the National Renewable Energy Laboratory (NREL) and Southern California Edison (SCE) involved laboratory short-circuit testing single-phase (240 VAC) residential type (between 1.5 and 7kW) inverters. This paper will reveal test results obtained from these short-circuit tests.

Keller, J.; Kroposki, B.; Bravo, R.; Robles, S.

2011-01-01T23:59:59.000Z

205

''Water bath'' effect during the electrical underwater wire explosion  

SciTech Connect

The results of a simulation of underwater electrical wire explosion at a current density >10{sup 9} A/cm{sup 2}, total discharge current of {approx}3 MA, and rise time of the current of {approx}100 ns are presented. The electrical wire explosion was simulated using a one-dimensional radiation-magnetohydrodynamic model. It is shown that the radiation of the exploded wire produces a thin conducting plasma shell in the water in the vicinity of the exploding wire surface. It was found that this plasma shell catches up to 30% of the discharge current. Nevertheless, it was shown that the pressure and temperature of the wire material remain unchanged as compared with the idealized case of the electrical wire explosion in vacuum. This result is explained by a 'water bath' effect.

Oreshkin, V. I.; Chaikovsky, S. A.; Ratakhin, N. A.; Grinenko, A.; Krasik, Ya. E. [High Current Electronic Institute SB RAS, Tomsk (Russian Federation); Physics Department, Technion, Haifa 32000 (Israel)

2007-10-15T23:59:59.000Z

206

Study on the Harmonics of Photovoltaic Generation SPWM Inverting Power Supplies  

Science Conference Proceedings (OSTI)

Harmonics are the main polluting source of affecting the power energy quality. In this paper, the causes that SPWM inverter power supply produces the harmonics are analyzed firstly and then a new three-phase ?-band-pass filter is designed to improve ... Keywords: harmonious, solar energy photovoltaic power, inverter, current ripples component

Jianqu Zhu; Feng Wang; Taiqiang Cao

2012-04-01T23:59:59.000Z

207

Performance Test Protocol for Evaluating Inverters Used in Grid-Connected  

E-Print Network (OSTI)

Performance Test Protocol for Evaluating Inverters Used in Grid-Connected Photovoltaic Systems....................................................................................................................................... 36 A1 Simplified Photovoltaic I-V Curve Model Inverters Used in Grid-Connected Photovoltaic Systems 1 Overview One measure of the maturity of an industry

208

A model reduction approach for constructing compact dynamic thermal models of IGBT-modules of inverters  

Science Conference Proceedings (OSTI)

This paper presents a model reduction approach for constructing lumped RC thermal networks of IGBT-modules of inverters for which heat and subsequent temperature increases vary with time on different scales ranging from nanosecond to second. It was observed ... Keywords: Compact thermal modelling, Electro-thermal simulation, IGBT-modules, Inverters, Thermal analysis

J. Antonios; N. Ginot; C. Batard; Y. Scudeller; M. Machmoum

2012-06-01T23:59:59.000Z

209

Different methods for direct torque control of induction motor fed from current source inverter  

Science Conference Proceedings (OSTI)

Two different methods for direct torque control (DTC) of induction motor fed from current source inverter (CSI) is analyzed in the paper. The first one is derived from well-known DTC strategy developed for voltage inverter drives. This type of control ... Keywords: CSI, DTC, constant switching, hysteresis comparator, induction motor

Aleksandar Nikolic; Borislav Jeftenic

2008-07-01T23:59:59.000Z

210

Influence of voltage drop to electric drive with induction motor and voltage sourced inverter  

Science Conference Proceedings (OSTI)

This paper solves problematic of immunity from the voltage drop of the power supply of the electric drive with induction motor with Voltage-Fed inverter. There are reflected opportune control algorithms for the quickly to change of working regime from ... Keywords: electric drive with induction motor, electric drive with voltage sourced inverter, voltage drop

P. Beneš; J. Fo?t; M. Pittermann

2011-09-01T23:59:59.000Z

211

Switching response modeling of the CMOS inverter for sub-micron devices  

Science Conference Proceedings (OSTI)

In this paper an accurate, analytical model for the evaluation of the CMOS inverter delay in the sub- micron regime, is presented. A detailed analysis of the inverter operation is provided which results to accurate expressions describing the output waveform. ... Keywords: CMOS circuits timing analysis, Propagation delay modeling, Sub-micron devices.

L. Bisdounis; S. Nikolaidis; O. Koufopavlou; C. E. Goutis

1998-02-01T23:59:59.000Z

212

A New Multi-level Inverter with FACTS Capabilities for Wind Applications  

Science Conference Proceedings (OSTI)

The modular multilevel converter (MMC) is an attractive topology for HVDC/FACTS systems. In this paper a new single-phase MMC-based D-STATCOM inverter for grid connection is proposed. The proposed inverter is designed for grid-connected wind turbines ... Keywords: D-STATCOM, Modular Multi-level Converter, Renewable Energy Source

Pedram Sotoodeh, Ruth Douglas Miller

2013-04-01T23:59:59.000Z

213

Towards an understanding of light activation processes in titanium oxide based inverted organic solar cells  

E-Print Network (OSTI)

, 233903 (2012) Thin-film encapsulation of inverted indium-tin-oxide-free polymer solar cells by atomic structures.2­5 In an inverted PSC, electrons are collected by the indium tin oxide (ITO) bottom electrode of increasing attention around the world for the last 20 years as a potential source of renewable energy. PSC

214

Ligand chemistry of titania precursor affects transient photovoltaic behavior in inverted organic solar cells  

E-Print Network (OSTI)

transient photovoltaic behavior in inverted organic solar cells Jong Bok Kim,1,a) Seokhoon Ahn,2,b) Seok JuLigand chemistry of titania precursor affects transient photovoltaic behavior in inverted organic solar cells Jong Bok Kim, Seokhoon Ahn, Seok Ju Kang, Colin Nuckolls, and Yueh-Lin Loo Citation: Appl

215

Synchronization and Power Sharing for Droop-Controlled Inverters in Islanded Microgrids  

E-Print Network (OSTI)

Synchronization and Power Sharing for Droop-Controlled Inverters in Islanded Microgrids John W in an inductive microgrid. We show that a network of loads and DC/AC inverters equipped with power-frequency droop model, distributed control. 1 Introduction A microgrid is a low-voltage electrical network, hetero

Bullo, Francesco

216

Inverted Troughs and Cyclogenesis over Interior North America: A Limited Regional Climatology and Case Studies  

Science Conference Proceedings (OSTI)

A limited regional climatology of cyclones with and without inverted troughs that form in the Colorado region is presented along with case study results from two major cyclone events in which an inverted trough plays a prominent role in the life ...

Len G. Keshishian; Lance F. Bosart; W. Edward Bracken

1994-04-01T23:59:59.000Z

217

Status and Needs of Power Electronics for Photovoltaic Inverters: Summary Document  

SciTech Connect

Photovoltaic inverters are the most mature of any DER inverter, and their mean time to first failure (MTFF) is about five years. This is an unacceptable MTFF and will inhibit the rapid expansion of PV. With all DER technologies, (solar, wind, fuel cells, and microturbines) the inverter is still an immature product that will result in reliability problems in fielded systems. The increasing need for all of these technologies to have a reliable inverter provides a unique opportunity to address these needs with focused R&D development projects. The requirements for these inverters are so similar that modular designs with universal features are obviously the best solution for a ''next generation'' inverter. A ''next generation'' inverter will have improved performance, higher reliability, and improved profitability. Sandia National Laboratories has estimated that the development of a ''next generation'' inverter could require approximately 20 man-years of work over an 18- to 24-month time frame, and that a government-industry partnership will greatly improve the chances of success.

WEST, RICK; MAUCH, KONRAD; QIN,YU CHIN; MOHAN,NED; BONN, RUSSELL H.

2002-04-01T23:59:59.000Z

218

Noise-Tolerant Model of a Ternary Inverter Based on Markov Random Field  

Science Conference Proceedings (OSTI)

A noise-tolerant model of a ternary inverter is proposed based on extension of Markov Random Field (MRF). Simulation results are reported to justify the noise immunity of this model using PSPICE and 16-nm Berkeley CMOS technology. Keywords: ternary inverter, noise-tolerance, Markov random field model

Golam Tangim, Svetlana N. Yanushkevich, Seiya Kasai, Vlad P. Shmerko

2013-05-01T23:59:59.000Z

219

Evaluation tests of Abacus 6 kVA utility-interactive inverter  

SciTech Connect

The voltage pattern spectra were analyzed for 100% and 50% pattern ratios and harmonics analyses are provided for the Abacus inverter. The harmonics are compared with those calculated for a simple model with no agreement. AC waveforms and inverter current spectra are given as well as basic electrical data. (LEW)

Landsman, E.E.

1981-08-01T23:59:59.000Z

220

An SCR inverter with an integral battery charger for electric vehicles  

SciTech Connect

A thyristor-based inverter/charger for use in electric passenger vehicles is described, and prototype charger test results are presented. A battery charger is included integral to the inverter by using a subset of the inverter power circuit components. The integral charger employs the inverter commutation components as a resonant ac/dc converter rated at 3.6 kW. The resulting charger provides electrical isolation between the vehicle propulsion battery and ac line and is capable of charging a 25kWh propulsion battery in 8 h from a 220-V ac line. Charger efficiency and power factor at an output power of 3.6 kW are 86 and 95 percent, respectively. The inverter, when operated with a matching polyphase ac induction motor and nominal 132-V propulsion battery, can provide a peak shaft power of 34 kW (45 hp) during motoring operation and 45 kW (60 hp) during regeneration. Thyristors are employed for the inverter power switching devices and are arranged in an input-commutated topology. This configuration requires only two thyristors to commutate the six main inverter thyristors. The combined ac inverter/charger package weighs 47 kg (103 lb).

Thimmesch, D.

1985-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Investigating the Use of Ultrasonic Guided Waves for Aging Wire  

E-Print Network (OSTI)

Aging wiring has become a critical issue to DoD, NASA, FAA, and Industry. The problem is that insulation on environmentally aged wire becomes brittle and cracks. This exposes the underlying conductive wire to the potential for short circuits and fire. The difficulty is that techniques to monitor aging wire problems focus on applying electrical sensing techniques that are not very sensitive to the wire insulation. Thus, the development of methods to quantify and monitor aging wire insulation is highly warranted. Measurement of wire insulation stiffness by ultrasonic guided waves is being examined. Initial laboratory tests were performed on a simple model consisting of a solid cylinder and then a solid cylinder with a polymer coating. Experimental measurements showed that the lowest order axisymmetric mode may be sensitive to stiffness changes in the wire insulation. To test this theory, mil-spec wire samples MIL-W-81381, MIL-W-22759/34, and MIL-W-22759/87 (typically found in aircraft) were heat-damaged in an oven, in a range of heating conditions. The samples were 12, 16, and 20 gauge and the heat-damage introduced material changes in the wire-insulation that made the originally flexible insulation brittle and darker in color. Axisymmetric mode phasevelocity increased for the samples that were exposed to heat for longer duration. For example, the phase velocity in the 20-gauge MIL-W-22759/34 wire changed from a baseline value of 2790m/s to 3280m/s and 3530m/s for one-hour exposures to 349 C and 399 C, respectively. Although the heat-damage conditions are not the same as environmental aging, we believe that with further development and refinements, the ultrasonic guided waves can be used to inspect wire-insulation for detrimental environmental aging conditions.

Insulation Assessment Robert; Robert F. Anastasi A; Eric I. Madaras B

2002-01-01T23:59:59.000Z

222

Soldering Small Beads to Fine Wires  

SciTech Connect

One method suggested for soldering small beads to fine wires using a torch to heat the bead, flux, and magnesia brick did not prove entirely satisfactory in this case. It was found the brick would draw heat away from the bead and flux at too fast a rate resulting in a poor weld, a rough surface, and an excessive accumulation of flux on the bead. Secondly, removal of the depleted flux presented a problem when the welding was done on the surface of the brick.

Stanton, J. S.

1950-03-01T23:59:59.000Z

223

Corrosion Behavior of Twin Wire Arc Sprayed Inconel Coating  

Science Conference Proceedings (OSTI)

Presentation Title, Corrosion Behavior of Twin Wire Arc Sprayed Inconel Coating. Author(s), Sofiane Djeraf, Yamina Mebdoua, Hadj Lahmar, Rachid Lakhdari.

224

Challenges of Using Copper as a Bonding Wire Material  

Science Conference Proceedings (OSTI)

Due to its malleability and surface properties, gold as a wire material is ideally suited for the bonding process. However, the cost of gold has increased ...

225

Microstructural Evolution in TWIP Steels during Wire Drawing  

Science Conference Proceedings (OSTI)

The results obtained by wire drawing have been compared with those by uniaxial tension and cold rolling. It has been shown that the evolution of texture and ...

226

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide...  

NLE Websites -- All DOE Office Websites (Extended Search)

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Low-dimensional materials have gained much attention not only because of the nonstop march toward...

227

Control of Wire Rod Physical Properties Like Ultimate Tensile ...  

Science Conference Proceedings (OSTI)

Sep 1, 2001 ... Control of Wire Rod Physical Properties Like Ultimate Tensile Strength and Elongation by Close Monitoring of Rolling Energy Input

228

Characterization of Wire Bonds Sujected to Ultrasonic ... - TMS  

Science Conference Proceedings (OSTI)

May 1, 2007 ... Characterization of Wire Bonds Sujected to Ultrasonic Welding and Thermal Cycling by Anil Saigal, Peterson Silva, Robert Greif and Michael ...

229

The Superelastic Behavior of Ti-Ni Superelastic Wire Rope  

Science Conference Proceedings (OSTI)

The advantages of superelastic wire ropes are better fatigue life, increase bending flexibility and increase responsively. There are few studies of superelastic ...

230

ORNL and SuperPower Sign Superconducting Wire Agreement  

for more efficient transmission of electricity. ... line networks; and increase power-transmission capacity. Second-generation (2G) wires made by

231

Hot Wire Chemical Vapor Deposition with Carbide Filaments ...  

Many of the current industry cells in production have come through NREL, ... One deposition technology utilized at NREL deals with hot wire chemical ...

232

Alliant Energy (Wisconsin Power and Light)- Farm Wiring Financing Program  

Energy.gov (U.S. Department of Energy (DOE))

Alliant Energy (Wisconsin Power & Light) offers a farm wiring financing program to increase farm safety, productivity and efficiency, while decreasing the potential for stray voltage on...

233

Bimetallic steel/aluminum wire for overhead telecommunication lines  

Science Conference Proceedings (OSTI)

for power transmission and overhead telecommunication lines and other .... " Method of manufacture of bimetallic wire for, e.g., trolley-bus cable or rods, n Inven-.

234

Numerical Simulations of Wire and Foil Behaviors under Megaampere...  

National Nuclear Security Administration (NNSA)

2: High Energy Density, Plasmas, Magnetic Fields Numerical Simulations of Wire and Foil Electrical Explosion under Helical EMG Current Drive for Warm Dense Matter Generation S.F....

235

Electrical and capacitive methods for detecting degradation in wire insulation.  

E-Print Network (OSTI)

??Motivated by a need within the aerospace industry to detect and characterize degradation in the insulation of onboard wires, this thesis reports testing of several… (more)

Sheldon, Robert Thomas

2012-01-01T23:59:59.000Z

236

Processing of Aluminum Wires and Its Effect on Their Electrical ...  

Science Conference Proceedings (OSTI)

The treated specimens were mechanically tested and their electrical resistivity was measured and compared with pure aluminum wires. The highest electrical ...

237

ELECTROSTATIC MODELING OF THE JEFFERSON LABORATORY INVERTED CERAMIC GUN  

SciTech Connect

Jefferson Laboratory (JLab) is currently developing a new 500kV DC electron gun for future use with the FEL. The design consists of two inverted ceramics which support a central cathode electrode. This layout allows for a load-lock system to be located behind the gun chamber. The electrostatic geometry of the gun has been designed to minimize surface electric field gradients and also to provide some transverse focusing to the electron beam during transit between the cathode and anode. This paper discusses the electrode design philosophy and presents the results of electrostatic simulations. The electric field information obtained through modeling was used with particle tracking codes to predict the effects on the electron beam.

P. Evtushenko ,F.E. Hannon, C. Hernandez-Garcia

2010-05-01T23:59:59.000Z

238

CEBAF 200 kV Inverted Electron Gun  

Science Conference Proceedings (OSTI)

Two DC high voltage GaAs photoguns have been built at Jefferson Lab based on a compact inverted insulator design. One photogun provides the polarized electron beam at CEBAF and operates at 130 kV bias voltage. The other gun is used for high average current lifetime studies at a dedicated test facility and has been operated at bias voltage up to 225 kV. The advantages of higher DC voltage for CEBAF include reduced space-charge emittance growth and the potential for prolonged photocathode lifetime. However, a consequence of operating at higher voltages is the increased likelihood of field emission or breakdown, both of which are unacceptable. Highlights of the R&D studies leading toward a production 200keV GaAs photogun for CEBAF will be presented.

J.M. Grames, P.A. Adderley, J. Clark, J. Hansknecht, M. Poelker, M.L. Stutzman, R. Suleiman, K.E.L. Surles-Law

2011-03-01T23:59:59.000Z

239

EV drivetrain inverter with V/HZ optimization  

DOE Patents (OSTI)

An inverter (34) which provides power to an A.C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A.C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A.C. machine is optimized. The control circuit includes a micro-computer which calculates optimized machine control data signals from various parametric inputs and during steady state load conditions, seeks a best V/HZ ratio to minimize battery current drawn (system losses) from a D.C. power source (32). In the preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack and a three-phase induction motor (18).

Gritter, David J. (Southfield, MI); O' Neil, Walter K. (Birmingham, MI)

1986-01-01T23:59:59.000Z

240

Thin films flowing down inverted substrates: two dimensional flow  

E-Print Network (OSTI)

We consider free surface instabilities of films flowing on inverted substrates within the framework of lubrication approximation. We allow for the presence of fronts and related contact lines, and explore the role which they play in instability development. It is found that a contact line, modeled by a commonly used precursor film model, leads to free surface instabilities of convective type without any additional natural or excited perturbations. A single parameter D=(3Ca)^{1/3}cot\\alpha, where Ca is the capillary number and \\alpha is the inclination angle, is identified as a governing parameter in the problem. This parameter may be interpreted to reflect the combined effect of inclination angle, film thickness, Reynolds number and the fluid flux. Variation of D leads to change of the wave-like properties of the instabilities, allowing to observe traveling wave behavior, mixed waves, and the waves resembling solitary ones.

Lin, Te-sheng

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Legend Units  

Science Conference Proceedings (OSTI)

... Syntax: LEGEND UNIT units> where is an integer number or parameter in the range 1 to 100 that specifies the legend identifier; and ...

2013-11-27T23:59:59.000Z

242

Humidity effects on wire insulation breakdown strength.  

SciTech Connect

Methods for the testing of the dielectric breakdown strength of insulation on metal wires under variable humidity conditions were developed. Two methods, an ASTM method and the twisted pair method, were compared to determine if the twisted pair method could be used for determination of breakdown strength under variable humidity conditions. It was concluded that, although there were small differences in outcomes between the two testing methods, the non-standard method (twisted pair) would be appropriate to use for further testing of the effects of humidity on breakdown performance. The dielectric breakdown strength of 34G copper wire insulated with double layer Poly-Thermaleze/Polyamide-imide insulation was measured using the twisted pair method under a variety of relative humidity (RH) conditions and exposure times. Humidity at 50% RH and below was not found to affect the dielectric breakdown strength. At 80% RH the dielectric breakdown strength was significantly diminished. No effect for exposure time up to 140 hours was observed at 50 or 80%RH.

Appelhans, Leah

2013-08-01T23:59:59.000Z

243

TMS320F2812 DSP controller for dynamic voltage restorer (DVR) application for improving of a three phase inverter  

Science Conference Proceedings (OSTI)

This paper discusses a control technique improvement of a three-phase inverter using TMS320F2812 DSP controller for Dynamic Voltage Restorer (DVR) applications. The output of the inverter is then connected to a voltage grid via a second order filter ... Keywords: TMS320F2812 DSP, dynamic voltage restorer (DVR), filter, inverters, total harmonic distortion (THD)

R. Omar; N. A. Rahim

2010-07-01T23:59:59.000Z

244

WPET '98, Dearborn, Michigan, October 22-23, 1998, pp. 79-84. Multilevel Inverters for Electric Vehicle Applications  

E-Print Network (OSTI)

) and hybrid-electric vehicle (HEV) motor drives. Diode-clamped inverters and cascaded H-bridge inverters, (1 and many military combat vehicles that have large electric drives will require advanced power electronic@ornl.gov Abstract This paper presents multilevel inverters as an application for all-electric vehicle (EV

Tolbert, Leon M.

245

WireGL: a scalable graphics system for clusters  

Science Conference Proceedings (OSTI)

We describe WireGL, a system for scalable interactive rendering on a cluster of workstations. WireGL provides the familiar OpenGL API to each node in a cluster, virtualizing multiple graphics accelerators into a sort-first parallel renderer with a parallel ... Keywords: cluster rendering, parallel rendering, remote graphics, scalable rendering, tiled displays, virtual graphics

Greg Humphreys; Matthew Eldridge; Ian Buck; Gordan Stoll; Matthew Everett; Pat Hanrahan

2001-08-01T23:59:59.000Z

246

Comparison of quantum confinement effects between quantum wires and dots  

E-Print Network (OSTI)

? wire . Si GaAs InAs InP CdSe CdS CdTe ? dot ? dot ? wire ?systems like InP and CdSe. Here, we like to address thesematerials: Si, InP, InAs, GaAs, CdSe, CdS, and CdTe. Unlike

Li, Jingbo; Wang, Lin-Wang

2004-01-01T23:59:59.000Z

247

Review of Polyimide Insulated Wire in Nuclear Power Plants  

Science Conference Proceedings (OSTI)

Because of its toughness and other desirable properties, Kapton insulated wire has been test-qualified for use in nuclear power plants; however, failures of this material in military aircraft have raised safety questions. This report identifies the conditions of proper use and handling that will ensure reliable functioning of the wire under nuclear plant operating and accident conditions.

1991-03-01T23:59:59.000Z

248

Understanding and managing the effects of battery charger and inverter aging  

SciTech Connect

An aging assessment of battery chargers and inverters was conducted under the auspices of the NRC's Nuclear Plant Aging Research (NPAR) Program. The intentions of this program are to resolve issues related to the aging and service wear of equipment and systems at operating reactor facilities and to assess their impact on safety. Inverters and battery chargers are used in nuclear power plants to perform significant functions related to plant safety and availability. The specific impact of a battery charger or inverter failure varies with plant configuration. Operating experience data have demonstrated that reactor trips, safety injection system actuations, and inoperable emergency core cooling systems have resulted from inverter failures; and dc bus degradation leading to diesel generator inoperability or loss of control room annunication and indication have resulted from battery and battery charger failures. For the battery charger and inverter, the aging and service wear of subcomponents have contributed significantly to equipment failures. This paper summarizes the data and then describes methods that can be used to detect battery charger and inverter degradation prior to failure, as well as methods to minimize the failure effects. In both cases, the managing of battery charger and inverter aging is emphasized. 5 refs.

Gunther, W. (Brookhaven National Lab., Upton, NY (United States)); Aggarwal, S. (Nuclear Regulatory Commission, Washington, DC (United States))

1992-01-01T23:59:59.000Z

249

Understanding and managing the effects of battery charger and inverter aging  

SciTech Connect

An aging assessment of battery chargers and inverters was conducted under the auspices of the NRC`s Nuclear Plant Aging Research (NPAR) Program. The intentions of this program are to resolve issues related to the aging and service wear of equipment and systems at operating reactor facilities and to assess their impact on safety. Inverters and battery chargers are used in nuclear power plants to perform significant functions related to plant safety and availability. The specific impact of a battery charger or inverter failure varies with plant configuration. Operating experience data have demonstrated that reactor trips, safety injection system actuations, and inoperable emergency core cooling systems have resulted from inverter failures; and dc bus degradation leading to diesel generator inoperability or loss of control room annunication and indication have resulted from battery and battery charger failures. For the battery charger and inverter, the aging and service wear of subcomponents have contributed significantly to equipment failures. This paper summarizes the data and then describes methods that can be used to detect battery charger and inverter degradation prior to failure, as well as methods to minimize the failure effects. In both cases, the managing of battery charger and inverter aging is emphasized. 5 refs.

Gunther, W. [Brookhaven National Lab., Upton, NY (United States); Aggarwal, S. [Nuclear Regulatory Commission, Washington, DC (United States)

1992-06-01T23:59:59.000Z

250

Analysis of Supercooled Liquid Water Measurements Using Microwave Radiometer and Vibrating Wire Devices  

Science Conference Proceedings (OSTI)

A review is made of the theoretical basis for using a vibrating wire to measure supercooled liquid water in clouds. The device consists of a vibrating wire and associated electronics added to radiosondes. The sensing wire that collects ...

Geoffrey E. Hill

1994-10-01T23:59:59.000Z

251

ORNL Publishes Study on Superconducting Wire Performance | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

ORNL Publishes Study on Superconducting Wire Performance ORNL Publishes Study on Superconducting Wire Performance ORNL Publishes Study on Superconducting Wire Performance August 23, 2013 - 4:06pm Addthis The Department of Energy's Oak Ridge National Laboratory (ORNL) recently released a new study on advances in superconducting wire technology. A team led by ORNL's Amit Goyal demonstrated that the ability to control nanoscale imperfections in superconducting wires results in materials with excellent and customized performance. The team's findings are published in Nature Publishing Group's Scientific Reports. The full press release and link to the new report are available on ORNL's website. Dr. Goyal, a high temperature superconductivity (HTS) research at ORNL, won the Department's 2011 E.O. Lawrence Award in the inaugural category of

252

Alliant Energy (Wisconsin Power and Light) - Farm Wiring Grant Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Alliant Energy (Wisconsin Power and Light) - Farm Wiring Grant Alliant Energy (Wisconsin Power and Light) - Farm Wiring Grant Program Alliant Energy (Wisconsin Power and Light) - Farm Wiring Grant Program < Back Eligibility Agricultural Maximum Rebate $9,000 Program Info State Wisconsin Program Type Utility Grant Program Rebate Amount $1,000 plus 50% of remaining costs Provider Alliant Energy Alliant Energy (Wisconsin Power and Light) offers a Farm Wiring Grant program to increase farm safety, productivity and efficiency. The first $1,000 of the cost of the project is covered by a grant, as well as 50% of the remaining costs (up to $9,000), for a maximum grant incentive of $10,000. Alliant Energy will inspect the facility for stray voltage and recommend improvements. Alliant's Farm Wiring Financing Program also offers

253

Intermetallic alloy welding wires and method for fabricating the same  

DOE Patents (OSTI)

Welding wires for welding together intermetallic alloys of nickel aluminides, nickel-iron aluminides, iron aluminides, or titanium aluminides, and preferably including additional alloying constituents are fabricated as two-component, clad structures in which one component contains the primary alloying constituent(s) except for aluminum and the other component contains the aluminum constituent. This two-component approach for fabricating the welding wire overcomes the difficulties associated with mechanically forming welding wires from intermetallic alloys which possess high strength and limited ductilities at elevated temperatures normally employed in conventional metal working processes. The composition of the clad welding wires is readily tailored so that the welding wire composition when melted will form an alloy defined by the weld deposit which substantially corresponds to the composition of the intermetallic alloy being joined. 4 figs.

Santella, M.L.; Sikka, V.K.

1996-06-11T23:59:59.000Z

254

Intermetallic alloy welding wires and method for fabricating the same  

SciTech Connect

Welding wires for welding together intermetallic alloys of nickel aluminides, nickel-iron aluminides, iron aluminides, or titanium aluminides, and preferably including additional alloying constituents are fabricated as two-component, clad structures in which one component contains the primary alloying constituent(s) except for aluminum and the other component contains the aluminum constituent. This two-component approach for fabricating the welding wire overcomes the difficulties associated with mechanically forming welding wires from intermetallic alloys which possess high strength and limited ductilities at elevated temperatures normally employed in conventional metal working processes. The composition of the clad welding wires is readily tailored so that the welding wire composition when melted will form an alloy defined by the weld deposit which substantially corresponds to the composition of the intermetallic alloy being joined.

Santella, Michael L. (Knoxville, TN); Sikka, Vinod K. (Oak Ridge, TN)

1996-01-01T23:59:59.000Z

255

Investigating The Use Of Ultrasound For Evaluating Aging Wiring Insulation  

E-Print Network (OSTI)

This paper reviews our initial efforts to investigate the use of ultrasound to evaluate wire insulation. Our initial model was a solid conductor with heat shrink tubing applied. In this model, various wave modes were identified. Subsequently, several aviation classes of wires (MIL-W81381, MIL-W-22759/34, and MIL-W-22759/87) were measured. The wires represented polyimide and ethylene-tetraflouroethylene insulations, and combinations of polyimide and flouropolymer plastics. Wire gages of 12, 16, and 20 AWG sizes were measured. Finally, samples of these wires were subjected to high temperatures for short periods of time to cause the insulation to degrade. Subsequent measurements indicated easily detectable changes.

Eric I. Madaras; Robert F. Anastasi

2001-01-01T23:59:59.000Z

256

Loss of line shutdown for line-commutated utility-interactive inverter  

SciTech Connect

The line-commutated, single-phase, utility-interactive inverter has been used in utility-connected photovoltaic (PV) and wind energy systems because it is commercially available at an attractive price. If unity power factor operation is required, a shunt capacitor can be used. This causes a problem if the utility line is disconnected; the inverter can continue to run and can thus be a hazard. This can be solved by using a fast-acting overvoltage detection circuit which operates directly on the inverter control electronics.

Landsman, E.E.

1981-03-01T23:59:59.000Z

257

A method for reducing harmonics in output voltages of a double-connected inverter  

SciTech Connect

A new method for reducing harmonics involved in output voltages of the double-connected inverter is proposed. By adding four auxiliary switching devices and an interphase transformer with secondary winding to the conventional 12-step inverter, output voltages of the proposed circuit can be almost the same waveforms as a conventional 36-step inverter. In this paper, circuit performances and output voltage waveforms are discussed, and the optimum parameters are derived. Then, effects on harmonic reductions can be clarified by theoretical and experimental results, and ratings of system components are investigated.

Masukawa, Shigeo; Iida, Shoji (Tokyo Denki Univ., Tokyo (Japan). Dept. of Electrical Engineering)

1994-09-01T23:59:59.000Z

258

Smart Wires Demo March 17, 2004 REVISED  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Intelligent Power Infrastructure Consortium Intelligent Power Infrastructure Consortium Smart Wires Dynamically Controllable Grid Assets Prof. Deepak Divan Associate Director, Strategic Energy Institute Director, Intelligent Power Infrastructure Consortium School of Electrical Engineering Georgia Institute of Technology 777 Atlantic Drive NW deepak.divan@ece.gatech.edu Atlanta, GA 2 Power Delivery - Major Challenge for Sustainable Energy * Wind at price parity with natural gas, retail price parity imminent for solar PV. Binding RPS mandates of 10-40% in 27 states. * To meet current reliability standards, new solar/wind plants need energy storage, back-up fossil plants & spinning reserve. * EVs require spinning reserve and back-up generation. * Excessive new T&D buildout with RPS and EVs to meet energy

259

A Preliminary Cost Study of the Dual Mode Inverter Controller  

SciTech Connect

In 1998, the Power Electronics and Electric Machinery Research Center (PEEMRC) at the Oak Ridge National Laboratory (ORNL) started a program to investigate alternate field weakening schemes for permanent magnet (PM) motors. The adjective ''alternate'' was used because at that time, outside research emphasis was on motors with interior-mounted PMs (IPMs). The PEEMRC emphasis was placed on motors with surface-mounted PMs (SPMs) because of the relative ease of manufacturing SPM motors compared with the IPM motors. Today the PEEMRC is continuing research on SPMs while examining the IPMs that have been developed by industry. Out of this task--the goal of which was to find ways to drive PM motors that inherently have low inductance at high speeds where their back-emf exceeds the supply voltage--ORNL developed and demonstrated the dual mode inverter control (DMIC) [1,2] method of field weakening for SPM motors. The predecessor of DMIC is conventional phase advance (CPA), which was developed by UQM Technologies, Inc. [3]. Fig. 1 shows the three sets of anti-parallel thyristors in the dashed box that comprise the DMIC. If one removes the dashed box by shorting each set of anti-parallel thyristors, the configuration becomes a conventional full bridge inverter on the left driving a three phase motor on the right. CPA may be used to drive this configuration ORNL's initial analyses of CPA and DMIC were based on driving motors with trapezoidal back-emfs [4-6], obtained using double layer lapped stator windings with one slot per pole per phase. A PM motor with a sinusoidal back-emf obtained with two poles per slot per phase has been analyzed under DMIC operation as a University of Tennessee-Knoxville (UTK) doctoral dissertation [7]. In the process of this research, ORNL has completed an analysis that explains and quantifies the role of inductance in these methods of control. The Appendix includes information on the equations for the three components of phase inductance, L{sub gap}, L{sub slot}, and L{sub endturns}. PM motors inherently have a lower inductance because of the increase in effective air gap caused by the magnet, which is in the denominator of the equation for L{sub gap}. L{sub gap} accounts for about half of the phase inductance. Because of the low inductance, there is a propensity for currents to exceed the motor's rated value. DMIC solves this problem for low-inductance PM motors and, in addition, provides a number of safety features that protect against uncontrolled generator mode operation [8,9]; however, the DMIC topology adds a pair of anti-parallel thyristors in each of the three phases, thereby introducing additional silicon costs as well as additional voltage drops during operation. It poses the tradeoff question; under what conditions can the beneficial features of DMIC offset its additional silicon cost and voltage drop losses? The purpose of this report is to address the tradeoff question. Sections of the report will: (1) review the role of self-inductance in performance and control of PM motors, (2) discuss the bounding inductances for motors with trapezoidal back-emfs under CPA control, (3) discuss the bounding inductances for trapezoidal back-emfs under DMIC, (4) discuss the bounding inductances for the PM synchronous motor (PMSM), (5) present the analysis showing how DMIC minimizes current in PMSMs, (6) present the results of a cost study conducted for two motors driven using a CPA inverter and for two motors driven using DMIC, (7) discuss estimating life cycle cost benefits, and (8) present conclusions.

McKeever, J.W.

2005-01-28T23:59:59.000Z

260

A Preliminary Cost Study of the Dual Mode Inverter Controller  

SciTech Connect

In 1998, the Power Electronics and Electric Machinery Research Center (PEEMRC) at the Oak Ridge National Laboratory (ORNL) started a program to investigate alternate field weakening schemes for permanent magnet (PM) motors. The adjective ''alternate'' was used because at that time, outside research emphasis was on motors with interior-mounted PMs (IPMs). The PEEMRC emphasis was placed on motors with surface-mounted PMs (SPMs) because of the relative ease of manufacturing SPM motors compared with the IPM motors. Today the PEEMRC is continuing research on SPMs while examining the IPMs that have been developed by industry. Out of this task--the goal of which was to find ways to drive PM motors that inherently have low inductance at high speeds where their back-emf exceeds the supply voltage--ORNL developed and demonstrated the dual mode inverter control (DMIC) [1,2] method of field weakening for SPM motors. The predecessor of DMIC is conventional phase advance (CPA), which was developed by UQM Technologies, Inc. [3]. Fig. 1 shows the three sets of anti-parallel thyristors in the dashed box that comprise the DMIC. If one removes the dashed box by shorting each set of anti-parallel thyristors, the configuration becomes a conventional full bridge inverter on the left driving a three phase motor on the right. CPA may be used to drive this configuration ORNL's initial analyses of CPA and DMIC were based on driving motors with trapezoidal back-emfs [4-6], obtained using double layer lapped stator windings with one slot per pole per phase. A PM motor with a sinusoidal back-emf obtained with two poles per slot per phase has been analyzed under DMIC operation as a University of Tennessee-Knoxville (UTK) doctoral dissertation [7]. In the process of this research, ORNL has completed an analysis that explains and quantifies the role of inductance in these methods of control. The Appendix includes information on the equations for the three components of phase inductance, L{sub gap}, L{sub slot}, and L{sub endturns}. PM motors inherently have a lower inductance because of the increase in effective air gap caused by the magnet, which is in the denominator of the equation for L{sub gap}. L{sub gap} accounts for about half of the phase inductance. Because of the low inductance, there is a propensity for currents to exceed the motor's rated value. DMIC solves this problem for low-inductance PM motors and, in addition, provides a number of safety features that protect against uncontrolled generator mode operation [8,9]; however, the DMIC topology adds a pair of anti-parallel thyristors in each of the three phases, thereby introducing additional silicon costs as well as additional voltage drops during operation. It poses the tradeoff question; under what conditions can the beneficial features of DMIC offset its additional silicon cost and voltage drop losses? The purpose of this report is to address the tradeoff question. Sections of the report will: (1) review the role of self-inductance in performance and control of PM motors, (2) discuss the bounding inductances for motors with trapezoidal back-emfs under CPA control, (3) discuss the bounding inductances for trapezoidal back-emfs under DMIC, (4) discuss the bounding inductances for the PM synchronous motor (PMSM), (5) present the analysis showing how DMIC minimizes current in PMSMs, (6) present the results of a cost study conducted for two motors driven using a CPA inverter and for two motors driven using DMIC, (7) discuss estimating life cycle cost benefits, and (8) present conclusions.

McKeever, J.W.

2005-01-28T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Further Characterization of New NiTi Wire and Rotary Endodontic ...  

Science Conference Proceedings (OSTI)

Presentation Title, Further Characterization of New NiTi Wire and Rotary ... Higher-resolution transmission electron microscopy examination of M-Wire used to ...

262

Nuclear Maintenance Applications Center: Wire Brush Testing, Procurement, and Usage Guide  

Science Conference Proceedings (OSTI)

Improper design, selection, or use of wire brushes will cause the loss of wire brush filaments and can result in damage to plant equipment and nuclear fuel.

2010-12-23T23:59:59.000Z

263

Selection of ENRAF gauge wire material compatible with the Hanford waste tank environment  

Science Conference Proceedings (OSTI)

This document describes the selection of the wire material that will replace the 316 SS wire in the ENRAF level indicators.

Anantatmula, R.P.

1994-12-01T23:59:59.000Z

264

Inverted Metamorphic Cell Development: Cooperative Research and Development Final Report, CRADA Number CRD-05-156  

DOE Green Energy (OSTI)

This CRADA targeted technology transfer of the inverted metamorphic multi-junction (IMM) solar cell innovation from NREL to Emcore Photovoltaics. The technology transfer was successfully completed. Additionally, NREL provided materials characterization of solar cell structures produced at Emcore.

Wanlass, M.

2012-05-01T23:59:59.000Z

265

MOVPE Growth of High Efficiency Inverted Metamorphic 1.1eV Solar ...  

Science Conference Proceedings (OSTI)

This paper focuses on the 1.1ev Ga0.77In0.23As inverted metamorphic solar cell grown with AlGaInAs quarternary step graded buffer on 6o miscut (001) thin Ge ...

266

Monitoring Gulf Stream Transport by Radar Altimeter and Inverted Echo Sounders  

Science Conference Proceedings (OSTI)

Profiles of the Gulf Stream sea surface height (SSH) from the Geosat altimeter were compared with thermocline depth measurements from inverted echo sounders (IES) for a period of about 19 months. The correlation between SSH anomalies and ...

Kathryn A. Kelly; D. Randolph Watts

1994-05-01T23:59:59.000Z

267

Commercialization of a 2.5kW Utility Interactive Inverter for Distributed Generation  

SciTech Connect

Through this project, Advanced Energy Conversion (AEC) has developed, tested, refined and is preparing to commercialize a 2.5kW utility-interactive inverter system for distributed generation. The inverter technology embodies zero-voltage switching technology that will ultimately yield a system that is smaller, less expensive and more efficient than existing commercial technologies. This program has focused on commercial success through careful synthesis of technology, market-focus and business development. AEC was the primary participant. AEC is utilizing contract manufacturers in the early stages of production, allowing its technical staff to focus on quality control issues and product enhancements. The objective of this project was to bring the AEC inverter technology from its current pre-production state to a commercial product. Federal funds have been used to build and test production-intent inverters, support the implementation of the commercialization plan and bring the product to the point of UL certification.

Torrey, David A.

2006-05-26T23:59:59.000Z

268

Observational Analysis of an Upper-Level Inverted Trough during the 2004 North American Monsoon Experiment  

Science Conference Proceedings (OSTI)

Upper-level inverted troughs (IVs) associated with midlatitude breaking Rossby waves or tropical upper-troposphere troughs (TUTTs) have been identified as important contributors to the variability of rainfall in the North American monsoon (NAM) ...

Zachary O. Finch; Richard H. Johnson

2010-09-01T23:59:59.000Z

269

The Processing and Application of Inverted Echo Sounder Data from Drake Passage  

Science Conference Proceedings (OSTI)

Bottom pressure recorders (BPRs) have been deployed at Drake Passage (DP) to monitor changes in the volume transport of the Antarctic Circumpolar Current (ACC) through the passage. The use of inverted echo sounders (IESs) in assisting the ...

Michael P. Meredith; John M. Vassie; Robert Spencer; Karen J. Heywood

1997-08-01T23:59:59.000Z

270

High Voltage Thermal Battery Reliability Required to Equal Inverter-Converter Systems  

SciTech Connect

MC-583 and XMC-650 circuits, including associated pulse transformers, are compare with the inverter-converter system typical of present fuses. The required probabilities of thermal battery shorts and opens are determined.

1955-06-14T23:59:59.000Z

271

Deadbeat control of a three-phase inverter with an output LC filter  

SciTech Connect

The discrete-time control of a three-phase inverter with an output LC filter is described based on space vectors. The mathematical model of the inverter-filter system is first obtained by using space vectors to represent three-phase quantities. Deadbeat control laws are derived for no-load and resistive-load cases. Then, a deadbeat control law is obtained for the case when the load draws current of any waveshape from the inverter-filter. It is shown that deadbeat control of output voltage can be achieved in two control steps. The manipulated variable, which is the voltage vector demanded from the inverter, is implemented using the space vector modulation technique. Simulation results for various operating conditions are presented.

Kuekrer, O. [Eastern Mediterranean Univ., G. Magosa (Turkey). Dept. of Electrical and Electronic Engineering

1996-01-01T23:59:59.000Z

272

Low-Frequency Sea Level Variability and the Inverted Barometer Effect  

Science Conference Proceedings (OSTI)

For a dynamical interpretation of sea level records, estimates are needed of the isostatic, or so-called inverted barometer, signals (?ib) associated with the ocean response to atmospheric loading. Seasonal and longer-period ?ib signals are ...

Rui M. Ponte

2006-04-01T23:59:59.000Z

273

Investigation of Converting an AS-281 to an MC-762 Sealed Inverter  

SciTech Connect

This memorandum is a summary of the techniques, problems, and tests associated with enclosing an SA-381 inverter in a hermetically sealed container for long time storage in any environment without testing.

Roh, V.J.; Lange, D.F.; Schneemann, H.

1956-10-01T23:59:59.000Z

274

Capped ED-Mode AlN/GaN Inverters - Programmaster.org  

Science Conference Proceedings (OSTI)

The demonstrated inverter is operating at VDD = 5 V and consists of an enhancement- and depletion-mode HEMT with 1.5 nm thin subcritical AlN ...

275

Beam Position and Phase Monitor - Wire Mapping System  

SciTech Connect

The Los Alamos Neutron Science Center (LANSCE) deploys many cylindrical beam position and phase monitors (BPPM) throughout the linac to measure the beam central position, phase and bunched-beam current. Each monitor is calibrated and qualified prior to installation to insure it meets LANSCE requirements. The BPPM wire mapping system is used to map the BPPM electrode offset, sensitivity and higher order coefficients. This system uses a three-axis motion table to position the wire antenna structure within the cavity, simulating the beam excitation of a BPPM at a fundamental frequency of 201.25 MHz. RF signal strength is measured and recorded for the four electrodes as the antenna position is updated. An effort is underway to extend the systems service to the LANSCE facility by replacing obsolete electronic hardware and taking advantage of software enhancements. This paper describes the upgraded wire positioning system's new hardware and software capabilities including its revised antenna structure, motion control interface, RF measurement equipment and Labview software upgrades. The main purpose of the wire mapping system at LANSCE is to characterize the amplitude response versus beam central position of BPPMs before they are installed in the beam line. The wire mapping system is able to simulate a beam using a thin wire and measure the signal response as the wire position is varied within the BPPM aperture.

Watkins, Heath A [Los Alamos National Laboratory; Shurter, Robert B. [Los Alamos National Laboratory; Gilpatrick, John D. [Los Alamos National Laboratory; Kutac, Vincent G. [Los Alamos National Laboratory; Martinez, Derwin [Los Alamos National Laboratory

2012-04-10T23:59:59.000Z

276

English Units  

Science Conference Proceedings (OSTI)

English Units. A, B, C, D, E, F, G, H, I, J. 1, Steam Point Calculator: English Units, ... 6, Height of steam point apparatus above ground (ft.), 0, ft. ...

2011-12-22T23:59:59.000Z

277

Unit Conversions  

Science Conference Proceedings (OSTI)

... volume flow units, which contain "atm", assume that the gas is: ideal; at a pressure of 101325 Pa; at a temperature of 0 °C. Be aware that the unit "atm ...

2012-10-02T23:59:59.000Z

278

The Effects of a Hydrogen Environment on the Lifetime of Small-Diameter Drift Chamber Anode Wires  

DOE Green Energy (OSTI)

Possible deterioration of anode sense wires used in a hydrogen-filled neutron detector is investigated. Wires were loaded with free weights and put into a wire detector environment. Stainless Steel, Tungsten, and Platinum wires did not break after exposure to charge equivalent to many wire lifetimes. Furthermore, exposure to hydrogen gas caused no noticeable surface degradation or change in wire yield strength.

King, J; Smith, T; Kunkle, J; Castelaz, J; Thomson, S; Burstein, Z; Bernstein, A; Rosenberg, L; Hefner, M

2005-04-29T23:59:59.000Z

279

Application Guide for Integration of Grid-Supportive Inverters: Version 1  

Science Conference Proceedings (OSTI)

This application guide provides a reference for the integration of grid-supportive inverters. The guide is concise to serve as a quick reference, but also comprehensive in addressing the range of topics that utilities should consider when developing an integration strategy.Improvements in photovoltaic technology and renewable energy policies have greatly increased the number of inverter-based systems that are being connected to the grid. The vast majority of these are ...

2013-12-12T23:59:59.000Z

280

Engineering Technical Training Modules - Battery Chargers and Inverters (ETTM - BSI) Version 1.0  

Science Conference Proceedings (OSTI)

ETTM Battery Chargers and Inverters is a computer based training module that allows users to access training when desired and review it at their own pace. It provides graphics and limited interactive features to enhance learning. The scope and purpose of this training module is to discuss the principles involved in the operations of battery chargers and inverters, and to consider industry practices used in employing these components in a typical nuclear power plant application. Although the battery is an...

2010-11-30T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Modeling and dynamic performance of a line-commutated photovoltaic inverter system  

SciTech Connect

In this paper, a three-phase line-commutated utility-interactive photovoltaic inverter system is described. A simplified computer code of this system is established and presented in block-diagram form. This model is suitable for use in transient stability programs. The accuracy of the simplified model is verified by comparing the response calculated therefrom with that of a highly detailed photovoltaic system model in which the inverter is represented in valve-by-valve detail.

Wasynczuk, O. (Purdue Univ., Lafayette, IN (USA). School of Electrical Engineering)

1989-09-01T23:59:59.000Z

282

Modeling of nonstationary phenomena in the MHD-channel-inverter-substation system  

SciTech Connect

A method for constructing a mathematical model of nonstationary phenomena in a system consisting of an MHD channel and an inverter substation, operating on a powerful ac grid, is examined. The variants of the realization of the model on a computer are discussed. Results of the solution of model problems with a diagonal MHD channel are presented. It is found that there is a significant coupling between the MHD channel and the inverter substation in transient processes.

Gusev, Y.P.; Zatelepin, V.N.; Kuznetsova, T.N.; Medin, S.A.; Pishchikov, V.I.

1986-07-01T23:59:59.000Z

283

The Modeling of Vibration Damping in SMA Wires  

SciTech Connect

Through a mathematical and computational model of the physical behavior of shape memory alloy wires, this study shows that localized heating and cooling of such materials provides an effective means of damping vibrational energy. The thermally induced pseudo-elastic behavior of a shape memory wire is modeled using a continuum thermodynamic model and solved computationally as described by the authors in [23]. Computational experiments confirm that up to 80% of an initial shock of vibrational energy can be eliminated at the onset of a thermally-induced phase transformation through the use of spatially-distributed transformation regions along the length of a shape memory alloy wire.

Reynolds, D R; Kloucek, P; Seidman, T I

2003-09-16T23:59:59.000Z

284

Plasmon hybridization in parallel nano-wire systems  

Science Conference Proceedings (OSTI)

We apply the plasmon hybridization method to a double-nano-wire system, providing a simple and intuitive description of the plasmon excitations in the system. We apply the two-center cylindrical coordinate system for mathematical convenience and find an explicit form of the surface plasmon oscillations, in terms of the interaction between the bare plasmon modes of the individual surfaces of the nano-wires. We present numerical results to display how the plasmon excitations of the system depend on nano-wire separation when there is no angular momentum transfer, i.e., when m = 0.

Moradi, Afshin [Department of Nano Science, Kermanshah University of Technology, Kermanshah 67178-63766 (Iran, Islamic Republic of) and Department of Nano Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran 19395-5531 (Iran, Islamic Republic of)

2011-06-15T23:59:59.000Z

285

Wire bond vibration of forward pixel tracking detector of CMS  

SciTech Connect

Wire bonds of the Forward Pixel (FPix) tracking detectors are oriented in the direction that maximizes Lorentz Forces relative to the 4 Tesla field of the Compact Muon Solenoid (CMS) Detector's magnet. The CMS Experiment is under construction at the Large Hadron Collider at CERN, Geneva, Switzerland. We were concerned about Lorentz Force oscillating the wires at their fundamental frequencies and possibly fracturing or breaking them at their heels, as happened with the CDF wire bonds. This paper reports a study to understand what conditions break such bonds.

Atac, M.; /Fermilab; Gobbi, B.; /Northwestern U.; Kwan, S.; Pischalnikov, Y.; /Fermilab; Spencer, E.; /Northwestern U.; Sellberg, G.; Pavlicek, V.; /Fermilab

2006-10-01T23:59:59.000Z

286

Addressing water vaporization in the vicinity of an exploding wire  

SciTech Connect

The phase state of thin ({approx}1 {mu}m) layer of water adjacent to the surface of rapidly heated thin wire 100{+-}50 {mu}m in radius is analyzed by computer hydrodynamic calculation. It is shown that when heating of a wire to a temperature of 420 deg. C is achieved in less than {approx}500 ns, the trajectory of the phase state is contained in the liquid part of the phase diagram. This suggests additional proof of and an explanation for the absence of shunting plasma discharge in fast underwater electrical wire explosions.

Grinenko, A.; Gurovich, V. Tz.; Krasik, Ya. E.; Dolinsky, Yu. [Physics Department, Technion, 32000 Haifa (Israel); Department of Mechanical Engineering, Ben Gurion University, 84105 Beer-Sheva (Israel)

2006-12-01T23:59:59.000Z

287

Resonant snubber based soft-switching inverters for electric propulsion drives  

SciTech Connect

This paper summarizes recently developed soft-switching inverters and proposes two alternative options for electric propulsion drives. The newly developed soft-switching inverter employs an auxiliary switch and a resonant inductor per phase to produce a zero voltage across the main switch so that the main switch can turn on at the zero-voltage condition. Both the auxiliary switch and the resonant inductor are operating at a fractional duty, and thus are small in size as compared to the main inverter circuit components. Operation modes in a complete zero-voltage switching cycle for the single-phase soft-switching inverter are described in detail with graphical explanations. The circuit operation was first verified by a computer simulation and then tested with an 1-kW single-phase and an 100-kW three-phase inverters. Experimental results are presented to show the superior performance in efficiency improvement, EMI reduction, and dv/dt reduction of the proposed soft-switching inverters.

Lai, J.S.

1996-05-01T23:59:59.000Z

288

Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems  

SciTech Connect

This report describes the various methods and circuits that have been developed to detect an islanding condition for photovoltaic applications and presents three methods that have been developed to test those methods and circuits. Passive methods for detecting an islanding condition basically monitor parameters such as voltage and frequency and/or their characteristics and cause the inverter to cease converting power when there is sufficient transition from normal specified conditions. Active methods for detecting the island introduce deliberate changes or disturbances to the connected circuit and then monitor the response to determine if the utility grid with its stable frequency, voltage and impedance is still connected. If the small perturbation is able to affect the parameters of the load connection within prescribed requirements, the active circuit causes the inverter to cease power conversion and delivery of power to the loads. The methods not resident in the inverter are generally controlled by the utility or have communications between the inverter and the utility to affect an inverter shut down when necessary. This report also describes several test methods that may be used for determining whether the anti-islanding method is effective. The test circuits and methodologies used in the U.S. have been chosen to limit the number of tests by measuring the reaction of a single or small number of inverters under a set of consensus-based worst-case conditions.

BOWER, WARD I.; ROPP, MICHAEL

2002-11-01T23:59:59.000Z

289

Analysis of inverter models and harmonic propagation. Part II. Harmonic propagation  

SciTech Connect

Part II of a three part study describes the harmonic propagation in the photovoltaic power system consisting of the solar cell array, the inverter, and the ac side of the inverter up to the infinite bus of the utility. Propagation of the harmonics in the utility system are not addressed. Two main problems are analyzed: power in the converter system and harmonics of the current and voltage waveforms of the single-phase, dependent inverter. Relationships between the different components of the converter power - active, reactive and disturbance - are discussed. All formulas necessary for calculating the power components are given, assuming the harmonics of the current and voltage waveforms are known. The theoretical and experimental investigation of the single-phase, dependent inverter is described. The ac and dc terminal voltage of the inverter are analyzed and their harmonics are obtained. These data determine the harmonic propagation on both the dc and ac sides and may be useful for equipment design. Part I of the study (SAND 7040/1) contains a detailed description of the microcomputer based simulator that represents the output characteristics of the five commercially available types of solar cell arrays under different environmental conditions, and Part III (SAND 7040/3) presents an analysis of the transient and steady-state processes of inverter modules.

Slonim, M.A.; Stanek, E.K.

1984-09-01T23:59:59.000Z

290

Low-cost light-weight efficient 1. 5 kW inverters with and without output transformers. Final report, January 1976--June 1977  

SciTech Connect

Optimization efforts were completed on the 1.5 kW inverter described in report DECC-61098-003 (September 1975). A second inverter design was developed; in the second design the output transformer was eliminated. Tests were performed on both the optimized transformer-output inverter and the transformerless-output inverter. Tests included environmental tests on the transformer-output inverter. (Author)

Suelzle, L.R.; Suelzle, J.S.

1977-10-01T23:59:59.000Z

291

Arnold Schwarzenegger CERTS MICROGRID  

E-Print Network (OSTI)

-up. The unit generates power in a stand-alone mode (no grid-tie) and is connected to a load bank. The output of the inverter is connected to the Delta side of a transformer in a 3-wire configuration. The output of the transformer is wired to the load bank in a 4-wire configuration with a 25-yard loop. The inverter is also

292

Exploiting level sensitive latches in wire pipelining  

E-Print Network (OSTI)

The present research presents procedures for exploitation of level sensitive latches in wire pipelining. The user gives a Steiner tree, having a signal source and set of destination or sinks, and the location in rectangular plane, capacitive load and required arrival time at each of the destinations. The user also defines a library of non-clocked (buffer) elements and clocked elements (flip-flop and latch), also known as synchronous elements. The first procedure performs concurrent repeater and synchronous element insertion in a bottom-up manner to find the minimum latency that may be achieved between the source and the destinations. The second procedure takes additional input (required latency) for each destination, derived from previous procedure, and finds the repeater and synchronous element assignments for all internal nodes of the Steiner tree, which minimize overall area used. These procedures utilize the latency and area advantages of latch based pipelining over flip-flop based pipelining. The second procedure suggests two methods to tackle the challenges that exist in a latch based design. The deferred delay padding technique is introduced, which removes the short path violations for latches with minimal extra cost.

Seth, Vikram

2004-12-01T23:59:59.000Z

293

CEBAF 200 kV Inverted Electron Gun  

Science Conference Proceedings (OSTI)

Two DC high volt­age GaAs pho­to­guns have been built at Jef­fer­son Lab based on a com­pact in­vert­ed in­su­la­tor de­sign. One pho­to­gun pro­vides the po­lar­ized elec­tron beam at CEBAF and op­er­ates at 130 kV bias volt­age. The other gun is used for high av­er­age cur­rent life­time stud­ies at a ded­i­cat­ed test fa­cil­i­ty and has been op­er­at­ed at bias volt­age up to 225 kV. The ad­van­tages of high­er DC volt­age for CEBAF in­clude re­duced space-charge emit­tance growth and the po­ten­tial for pro­longed pho­to­cath­ode life­time. How­ev­er, a con­se­quence of op­er­at­ing at high­er volt­ages is the in­creased like­li­hood of field emis­sion or break­down, both of which are un­ac­cept­able. High­lights of the R&D stud­ies lead­ing to­ward a pro­duc­tion 200keV GaAs pho­to­gun for CEBAF will be pre­sent­ed.

Grames, J M; Clark, J; Hansknecht, J; Poelker, M; Stutzman, M L; Suleiman, R; Surles-Law, K.E.L.; BastaniNejad, M

2011-03-01T23:59:59.000Z

294

Building quantum wires: the long and the short of it  

Science Conference Proceedings (OSTI)

As quantum computing moves closer to reality the need for basic architectural studies becomes more pressing. Quantum wires, which transport quantum data, will be a fundamental component in all anticipated silicon quantum architectures. In this paper, ...

Mark Oskin; Frederic T. Chong; Isaac L. Chuang; John Kubiatowicz

2003-06-01T23:59:59.000Z

295

Alliant Energy (Wisconsin Power and Light) - Farm Wiring Financing Program  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Financing Financing Program Alliant Energy (Wisconsin Power and Light) - Farm Wiring Financing Program < Back Eligibility Agricultural Savings Category Other Appliances & Electronics Commercial Lighting Lighting Maximum Rebate $20,000 Program Info State Wisconsin Program Type Utility Loan Program Rebate Amount Varies Provider Alliant Energy Alliant Energy (Wisconsin Power and Light) offers a farm wiring financing program to increase farm safety, productivity and efficiency, while decreasing the potential for stray voltage on livestock farms. To start, Alliant Energy will inspect the facility for stray voltage and recommend improvements. Loans of up to $20,000 at 3% are available for wiring or efficiency equipment as part of this program. In addition to this program, Alliant-WP&L offers the Farm Wiring Grant

296

Ductile alloy and process for preparing composite superconducting wire  

DOE Patents (OSTI)

An alloy for the commercial production of ductile superconducting wire is prepared by melting together copper and at least 15 weight percent niobium under non-oxygen-contaminating conditions, and rapidly cooling the melt to form a ductile composite consisting of discrete, randomly distributed and orientated dendritic-shaped particles of niobium in a copper matrix. As the wire is worked, the dendritric particles are realigned parallel to the longitudinal axis and when drawn form a plurality of very fine ductile superconductors in a ductile copper matrix. The drawn wire may be tin coated and wound into magnets or the like before diffusing the tin into the wire to react with the niobium. Impurities such as aluminum or gallium may be added to improve upper critical field characteristics.

Verhoeven, John D. (Ames, IA); Finnemore, Douglas K. (Ames, IA); Gibson, Edwin D. (Ames, IA); Ostenson, Jerome E. (Ames, IA)

1983-03-29T23:59:59.000Z

297

Alliant Energy (Wisconsin Power and Light)- Farm Wiring Grant Program  

Energy.gov (U.S. Department of Energy (DOE))

Alliant Energy (Wisconsin Power & Light) offers a Farm Wiring Grant program to increase farm safety, productivity and efficiency. The first $1,000 of the cost of the project is covered by a...

298

Reliability of Wedge Wire Bonds Subjected to Ultrasonic Welding ...  

Science Conference Proceedings (OSTI)

This paper presents the effect of the ultrasonic welding lid attachment process on the reliability and mechanical strength of 1.0 and 1.5 mil gold wedge wire ...

299

Delivery optimization for a make to order custom wire mill  

E-Print Network (OSTI)

In the face of growing competition in the Tantalum business, H.C.Starck's management is minimizing the delivery time for custom-made capacitor-grade tantalum wire products. H.C. Starck, Inc., Newton, Massachusetts faces ...

Slivinskiy, Andrey L

2005-01-01T23:59:59.000Z

300

Closed form solutions to simultaneous buffer insertion/sizing and wire sizing  

Science Conference Proceedings (OSTI)

In this paper, we consider the delay minimization problem of an interconnect wire by simultaneously considering buffer insertion, buffer sizing and wire sizing. We consider three cases, namely using no buffer (i.e., wire sizing alone), using a given ... Keywords: buffer insertion, buffer sizing, closed form solution, interconnect optimization, wire sizing

Chris Chu; D. F. Wong

2001-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Correlation of the electrical and space-time characteristics during electrical explosion of wires  

SciTech Connect

The electrical and space-time characteristics during electrical explosion of wires is studied. (AIP)

Litvinenko, V.P.; Koval' , S.V.

1983-04-01T23:59:59.000Z

302

Process for producing fine and ultrafine filament superconductor wire  

DOE Patents (OSTI)

A process for producing a superconductor wire made up of a large number of round monofilament rods is provided for, comprising assembling a multiplicity of round monofilaments inside each of a multiplicity of thin wall hexagonal tubes and then assembling a number of said thin wall hexagonal tubes within an extrusion can and subsequently consolidating, extruding and drawing the entire assembly down to the desired wire size.

Kanithi, Hem C. (15 Briar Ct., Chesire, CT 06410)

1992-01-01T23:59:59.000Z

303

Repeatability of measurements of residential magnetic fields and wire codes  

SciTech Connect

Several epidemiological studies have been based on wire codes (i.e., categories of electrical wiring configurations near residences) or on in-home spot measurements of magnetic flux density (MFD) as surrogates for short- and long-term exposure of children and adults to residential magnetic fields. We used wire code and MFD measurements that were made in 81 Colorado homes in 1985 and again in 1990 to assess their repeatability over periods of 0-24 h and 5 years. These homes, a subset of those lived in by subjects from the case-control study of Savitz et al. [Am J Epidemiol 128:21-38, 1988], were divided into four approximately equally sized groups that were differentiated by wire code and by case-control status. Eight homes were assigned wire codes in 1990 that differed from the 1985 coding of Savitz and colleagues [1988]; of these, seven were coded as high-current configuration (HCC) and one as low-current configuration (LCC) in 1985. Overall, 37 homes were coded as HCC in 1990 compared with 38 homes in 1985. Coding differences were due to differing distance measurements (four homes), differing thick vs. thin categorization of primary-distribution line-conductor sizes (two homes), differing first-span vs. second-span categorization of secondary wires (one home), and physical changes in proximate electrical wiring (one home). Coefficients of correlation between MFD spot measurements that were separated in time by 0-24 h range between 0.70 and 0.90. The coefficient between spot measurements made in 1985 and then again in 1990 is 0.70. These coefficients are similar for HCC and LCC homes and do not depend on whether residential appliances were turned on or off. The data show (at least for the portion of Colorado studied) that residential wire code and, more surprisingly, spot MFD measurements, are fairly reliable over 0-24-h and 5-year periods.

Dovan, T.; Kaune, W.T.; Savitz, D.A. (ENERTECH Consultants, Campbell, CA (United States))

1993-01-01T23:59:59.000Z

304

Process for producing fine and ultrafine filament superconductor wire  

DOE Patents (OSTI)

A process for producing a superconductor wire made up of a large number of round monofilament rods is provided for, comprising assembling a multiplicity of round monofilaments inside each of a multiplicity of thin wall hexagonal tubes and then assembling a number of said thin wall hexagonal tubes within an extrusion can and subsequently consolidating, extruding and drawing the entire assembly down to the desired wire size. 8 figs.

Kanithi, H.C.

1992-02-18T23:59:59.000Z

305

Method of fabricating a homogeneous wire of inter-metallic alloy  

DOE Patents (OSTI)

A method for fabricating a homogeneous wire of inter-metallic alloy comprising the steps of providing a base-metal wire bundle comprising a metal, an alloy or a combination thereof; working the wire bundle through at least one die to obtain a desired dimension and to form a precursor wire; and, controllably heating the precursor wire such that a portion of the wire will become liquid while simultaneously maintaining its desired shape, whereby substantial homogenization of the wire occurs in the liquid state and additional homogenization occurs in the solid state resulting in a homogenous alloy product.

Ohriner, Evan Keith (Knoxville, TN); Blue, Craig Alan (Knoxville, TN)

2001-01-01T23:59:59.000Z

306

Processing and mechanical behavior of hypereutectoid steel wires  

DOE Green Energy (OSTI)

Hypereutectoid steels have the potential for dramatically increasing the strength of wire used in tire cord and in other high strength wire applications. The basis for this possible breakthrough is the elimination of a brittle proeutectoid network that can form along grain boundaries if appropriate processing procedures and alloy additions are used. A review is made of work done by Japanese and other researchers on eutectoid and mildly hypereutectoid wires. A linear extrapolation of the tensile strength of fine wires predicts higher strengths at higher carbon contents. The influence of processing, alloy additions and carbon content in optimizing the strength, ductility and fracture behavior of hypereutectoid steels is presented. It is proposed that the tensile strength of pearlitic wires is dictated by the fracture strength of the carbide lamella at grain boundary locations in the carbide. Methods to improve the strength of carbide grain boundaries and to decrease the carbide plate thickness will contribute to enhancing the ultrahigh strength obtainable in hypereutectoid steel wires. 23 refs., 13 figs., 1 tab.

Lesuer, D.R.; Syn, C.K.; Sherby, O.D.; Kim, D.K.

1996-06-25T23:59:59.000Z

307

Diamond Wire Saw for Precision Machining of Laser Target Components  

SciTech Connect

The fabrication of precision laser targets requires a wide variety of specialized mesoscale manufacturing techniques. The diamond wire saw developed in this study provides the capability to precisely section meso-scale workpieces mounted on the assembly stations used by the Target Fabrication Group. This new capability greatly simplifies the fabrication of many types of targets and reduces the time and cost required to build the targets. A variety of materials are used to fabricate targets, including metals, plastics with custom designed chemical formulas, and aerogels of various densities. The materials are usually provided in the form of small pieces or cast rods that must be machined to the required shape. Many of these materials, such as metals and some plastics, can be trimmed using a parting tool on a diamond turning machine. However, other materials, such as aerogels and brittle materials, cannot be adequately cut with a parting tool. In addition, the geometry of the parts often requires that the workpieces be held in a special assembly station, which excludes the use of a parting tool. In the past, these materials were sectioned using a small, handheld coping saw that used a diamond-impregnated wire as a blade. This miniature coping saw was effective, but it required several hours to cut through certain materials. Furthermore, the saw was guided by hand and often caused significant damage to fragile aerogels. To solve these problems, the diamond wire saw shown in Figure 1 was developed. The diamond wire saw is designed to machine through materials that are mounted in the Target Fabrication Group's benchtop assembly stations. These assembly stations are the primary means of aligning and assembling target components, and there is often a need to machine materials while they are mounted in the assembly stations. Unfortunately, commercially available saws are designed for very different applications and are far too large to be used with the assembly stations. Therefore, a custom diamond wire saw was designed and constructed. The diamond wire saw cuts through workpieces using a continuous loop of diamond-impregnated wire of length 840 mm. The wire loop runs around several idler pulleys and is driven by a simple geared DC motor that rotates at 17 rpm. The linear speed of the wire is 107 inches/minute. The saw is oriented at an angle of 20{sup o} from horizontal, so the operator can view the wire through the cutout at the front end of the saw. When looking through a microscope or camera with a horizontal line of sight, the operator can clearly see the wire as it cuts through the workpiece, as shown in the right side of Figure 1. The saw is mounted on a two-axis stage that allows the operator to align the wire with the workpiece. To cut through the workpiece, the operator drives the wire through the workpiece by turning the feed micrometer. An image of the interior of the diamond wire saw appears in Figure 2. This picture was taken after removing the protective cover plate from the saw.

Bono, M J; Bennett, D W

2005-08-08T23:59:59.000Z

308

A Soft-Switching Inverter for High-Temperature Advanced Hybrid Electric Vehicle Traction Motor Drives  

Science Conference Proceedings (OSTI)

The state-of-the-art hybrid electric vehicles (HEVs) require the inverter cooling system to have a separate loop to avoid power semiconductor junction over temperatures because the engine coolant temperature of 105?C does not allow for much temperature rise in silicon devices. The proposed work is to develop an advanced soft-switching inverter that will eliminate the device switching loss and cut down the power loss so that the inverter can operate at high-temperature conditions while operating at high switching frequencies with small current ripple in low inductance based permanent magnet motors. The proposed tasks also include high-temperature packaging and thermal modeling and simulation to ensure the packaged module can operate at the desired temperature. The developed module will be integrated with the motor and vehicle controller for dynamometer and in-vehicle testing to prove its superiority. This report will describe the detailed technical design of the soft-switching inverters and their test results. The experiments were conducted both in module level for the module conduction and switching characteristics and in inverter level for its efficiency under inductive and dynamometer load conditions. The performance will be compared with the DOE original specification.

None, None

2012-01-31T23:59:59.000Z

309

Development of a dc-to-ac inverter based on waveshaping  

SciTech Connect

A new topology for utility-interactive, dc-ac inverters is explored. The approach is presently limited by available devices to the single-phase, 2 to 10 kW power levels typical of residential photovoltaic applications. The approach combines two of the three basic inverter operations - waveshaping and regulation - in a single dc-dc converter stage. The output of this stage is a full-wave rectified (unipolar) sine wave. An inversion stage follows, performing the third basic inverter operation. The output is a current sine wave. This approach features unity power factor and less than 2% total current harmonic distortion. A 1-kW prototype was constructed, using a buck (down) converter for the dc-dc stage switching at approximately 20 kHz. Efficiency was generally above 90% with a peak efficiency of 94%. A cost breakdown of the prototype indicated the inverter could be built to meet the DOE cost goals for this class of inverter.

Cox, C.H. III; Landsman, E.E.; Rasmussen, N.E.

1982-08-01T23:59:59.000Z

310

2012 SG Peer Review - Smart Inverter Controls and Microgrid Interoperation at DECC - Tom Rizy, ORNL  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

g g Peer Review Meeting Smart Inverter Controls & Microgrid Interoperation at the Distributed Energy Communications & Controls (DECC) Lab ( ) D. Tom Rizy Oak Ridge National Laboratory (ORNL) June 7 th 2012 June 7 th , 2012 Smart Inverter (SI) Controls and Microgrid (MG) Interoperation Microgrid (MG) Interoperation Objectives * D l d SI l f l i l DECC Microgrid * Develop and test SI controls for multiple renewable/nonrenewable DER. * Develop MG controls and communication requirements for high penetration DER. * I l t MG t DECC L b Technical Scope * Implement MG at DECC Lab. * Transfer technology to industry. Life-cycle Funding Summary ($K) Prior to FY12 FY13 Out- Technical Scope * Develop advanced smart inverter control consisting of local droop (P-f, Q-V) control integrated with secondary closed

311

Photovoltaic power system tests on an 8-kilowatt single-phase line-commutated inverter  

SciTech Connect

A commercially available single-phase line-commutated inverter has been tested in a photovoltaic power system. Efficiency and power factor were measured as functions of solar array voltage and current. Also, the effects of input shunt capacitance and series inductance were determined. Tests were conducted from 15 to 75 percent of the 8 kW rated inverter input power. Measured efficiencies ranged from 76 percent (at 160 V and 8.0 A) to 88 percent (at 200 V and 18.7 A) at about 50 percent of rated inverter input power. Power factor ranged from 36 percent (at 160 V and 8.0 A) to 72 percent (at 200 V and 28.6 A).

Stover, J.B.

1978-02-01T23:59:59.000Z

312

Optimum system design of a three-phase rectifier-inverter type of frequency changer  

SciTech Connect

Steadily decreasing prices and improved performance of semiconductor devices have raised expectations towards the development and large-scale application of motor-mounted static converters. In view of this, the design of a rectifier-inverter type of frequency changer which requires very small reactive components is considered. Accordingly, rectifier and inverter PWM schemes which generate the minimum possible harmonic distortion are first discussed. By using a suitable analysis method, ''optimum'' design data are obtained for every major system component. Resulting reactive component values are shown to be considerably smaller than the ones required by typical rectifier-inverter structures. Predicted key results are verified by computer simulation.

Ziogas, P.D.; Kang, Y-G.; Stefanovic, V.R.

1985-09-01T23:59:59.000Z

313

Multilevel DC Link Inverter for Brushless Permanent Magnet Motors with Very Low Inductance  

SciTech Connect

Due to their long effective air gaps, permanent magnet motors tend to have low inductance. The use of ironless stator structure in present high power PM motors (several tens of kWs) reduces the inductance even further (< 100 {micro}H). This low inductance imposes stringent current regulation demands for the inverter to obtain acceptable current ripple. An analysis of the current ripple for these low inductance brushless PM motors shows that a standard inverter with the most commonly used IGBT switching devices cannot meet the current regulation demands and will produce unacceptable current ripples due to the IGBT's limited switching frequency. This paper introduces a new multilevel dc link inverter, which can dramatically reduce the current ripple for brushless PM motor drives. The operating principle and design guidelines are included.

Su, G.J.

2001-10-29T23:59:59.000Z

314

Seasonal efficiencies of residential heat pump air conditioners with inverter-driven compressors  

SciTech Connect

This paper describes a study to experimentally determine the steady-state characteristics, cyclic effect, and frosting/defrosting effect of a inverter heat pump currently available on the Japanese market and compute its seasonal efficiency based on the local outdoor air temperature data. It has been found that the APF of this heat pump is higher by 15% than that of the conventional fixed-speed heat pump. If cyclic and frosting/defrosting losses are eliminated, the APF of the inverter heat pump will be further improved by 2% to 6%. For the evaluation of an inverter heat pump, APF alone is not sufficient, and an additional parameter such as an annual comfort factor (ACF) is needed.

Hori, M.; Akamine, I.; Sakai, T.

1985-01-01T23:59:59.000Z

315

Extrusion of metal oxide superconducting wire, tube or ribbon  

DOE Patents (OSTI)

A process and apparatus for extruding a superconducting metal oxide composition YBa{sub 2}Cu{sub 3}O{sub 7-x} provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6--85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for extrusion contains a polymeric binder to provide a cohesive mass to bind the particles together during the extrusion process with the binder subsequently removed at lower temperatures during sintering. The composition for extrusion further includes a deflocculent, an organic plasticizer and a solvent which also are subsequently removed during sintering. Electrically conductive tubing with an inner diameter of 52 mil and an outer diameter of 87--335 mil has also been produced. Flat ribbons have been produced in the range of 10--125 mil thick by 100--500 mil wide. The superconducting wire, tube or ribbon may include an outer ceramic insulating sheath co-extruded with the wire, tubing or ribbon.

Dusek, J.T.

1990-01-01T23:59:59.000Z

316

Extrusion of metal oxide superconducting wire, tube or ribbon  

DOE Patents (OSTI)

A process for extruding a superconducting metal oxide composition YBa.sub.2 Cu.sub.3 O.sub.7-x provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6-85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for extrusion contains a polymeric binder to provide a cohesive mass to bind the particles together during the extrusion process with the binder subsequently removed at lower temperatures during sintering. The composition for extrusion further includes a deflocculent, an organic plasticizer and a solvent which also are subsequently removed during sintering. Electrically conductive tubing with an inner diameter of 52 mil and an outer diameter of 87-355 mil has also been produced. Flat ribbons have been produced in the range of 10-125 mil thick by 100-500 mil wide. The superconducting wire, tube or ribbon may include an outer ceramic insulating sheath co-extruded with the wire, tubing or ribbon.

Dusek, Joseph T. (Lombard, IL)

1993-01-01T23:59:59.000Z

317

First Measurements and Results With a Stretched Wire Test Setup  

Science Conference Proceedings (OSTI)

The LINAC Coherent Light Source [LCLS] is a free electron laser, designed to produce high brilliant X-ray beams using Self Amplified Spontaneous Emission [SASE]. Due to the physics of SASE, the electron beam has to be held very precisely on the same trajectory as the X-ray light beam generated by the undulator magnets. To optimize the SASE output, trajectory deviations between both beams have to be minimized to a few micrometers along the entire undulator section and held stable over the time period between beam-based-alignment processes. Consequently, extremely high position stability of all magnets in the undulator section is required to operate the LCLS successfully. The knowledge of any magnet movement exceeding few micrometers during periods of several weeks is essential for efficient X-ray generation. A well known principle of monitoring transverse component positions along beam lines is the application of stretched wires, associated with suitable wire position sensors and electronics. The particular challenge at LCLS is the required wire system performance in conjunction with the length of the undulator section and the large number of monitors. Verification of system stability and resolution under real conditions is the primary goal of this test setup. A stretched wire test setup has been implemented to gain experience for the final design of a wire system, which will meet the position monitoring requirements in the LCLS undulator section. The report briefly introduces the system's architecture and describes first measurements and results.

Peters, Franz

2010-12-13T23:59:59.000Z

318

Metric Units  

Science Conference Proceedings (OSTI)

... A, B, C, D, E, F, G, H, I, J. 1, Steam Point Calculator: Metric Units, Elevation Converter, ... 6, Height of steam point apparatus above ground (m), 0, m, ...

2011-12-22T23:59:59.000Z

319

United States  

Office of Legacy Management (LM)

- I - I United States Department of Energy D lSCk Al M E R "This book was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency

320

Agelidis, “Inverter for Single-Phase Grid Connected Photovoltaic Systems – An Overview,” Power Electron  

E-Print Network (OSTI)

Abstract- An overview on recent developments and a summary of the state-of-the-art of inverter technology in Europe for single-phase grid-connected Photovoltaic (PV) systems for power levels up to 5 kW is provided in this paper. The information includes details not only on the topologies commercially available but also on the switching devices employed and the associated switching frequencies, efficiency, price trends and market share. Finally, the paper outlines issues associated with the development of relevant international industry standards affecting PV inverter technology. I.

Martina Calais; Johanna Myrzik; Ted Spoone; Vassilios G. Agelidis

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Next-generation three-phase inverters. Phase one annual report, 1996  

DOE Green Energy (OSTI)

The PV-MaT 4A subcontract addresses the cost effective manufacture of PV related end-products. Advanced Energy Systems Inc. (AES Inc.) has undertaken NREL contract No. ZAF-4-14271-10, {open_quotes}Next Generation Three Phase Inverter{close_quotes}, to combine leading industry skill with state-of-the-art technologies to realize cutting-edge PV inverter related products. To this end, in phase one of the PV-MaT contract, AES Inc. has made significant inroads toward establishing low cost manufacture of an intelligent controller PV-hybrid product.

Wesley, A.; Wills, R. [Advanced Energy Systems Inc., Wilton, NH (United States)

1997-07-01T23:59:59.000Z

322

Testing and Development of a 30-kVA Hybrid Inverter: Lessons Learned and Reliability Implications  

SciTech Connect

A 30-kVA Trace Technologies hybrid power processor was specified and tested at the Sandia inverter test facility. Trace Technologies involving the control system, in response to suggestions made modifications, primarily by Sandia and Arizona Public Service (APS) personnel. The modifications should make the inverter more universally applicable and less site-specific so that it can be applied in various sites with minimal field interaction required from the design engineer. The project emphasized the importance of battery management, generator selection, and site load management to the performance and reliability of hybrid power systems.

Ginn, J.W.

1998-12-21T23:59:59.000Z

323

A PWM method for reduction of switching loss in a full-bridge inverter  

SciTech Connect

This paper presents the ``hybrid pulsewidth modulation`` (HPWM) method which requires only two of the four switches in a full-bridge inverter to be pulsewidth-modulated at high frequency, thus significantly reducing the switching losses in the other two switches. For triangular carriers, HPWM has the same frequency spectrum and switching losses as the conventional unipolar PM (UPWM). A low-frequency model for a fast-switching HPWM full-bridge inverter with high-quality output is described, and is substantiated by experimental data.

Lai, R.S.; Ngo, K.D.T. [Univ. of Florida, Gainesville, FL (United States). Dept. of Electrical Engineering

1995-05-01T23:59:59.000Z

324

Voltage holding considerations for direct-collection units  

SciTech Connect

Results have been obtained from initial experiments designed to study high-voltage breakdown under conditions of importance to the design of direct- collection units. A coaxial configuration was used to mock-up critical fields near grid wires. With appropriate heat conditioning, fields as high as 9.6 x 10/ sup 5/ V/cm were maintained at the surface of a 7-mil-diam tungsten wire. This represents an enhanced field of ~10/sup 8/V/cm at whisker'' sites. Breakdown criteria are proposed for three regimes; initial, field-emission, and ultimate, which differ by the amount of prior conditioning applied to the wire. Additional considerations of importance to direct collectors such as the effect of thermionic emission and ion bombardment are discussed. (auth)

Miley, G.H.

1973-12-01T23:59:59.000Z

325

Analysis of Compact Cylindrical Wire Array Implosions with Brass and also by Alternating Brass and Al wires on the 1-MA COBRA Generator  

SciTech Connect

Implosions from compact cylindrical wire arrays (CCWA) with mid-Z and low-Z wires were carried out on the 1-MA COBRA generator at Cornell University. In particular, the CCWA used either Brass 310 (70% Cu, 30% Zn) wires or a combination of Brass 310 and Al 5056 (95% Al, 5% Mg) wires arranged in an alternating pattern. A total of 16 wires were used on either a 6 or 4 mm diameter array. The diagnostic suite included a bolometer, fast x-ray detectors, a time-integrated spectrometer, and a streak camera. A higher energy output was observed from bolometer measurements when alternating the brass and Al wires compared to using only the brass wires. This study will focus mainly on the spectroscopy of the brass and alternating brass and Al CCWA by applying the non-LTE kinetic models of Cu and Zn to account for the L-shell radiation. The resulting plasma parameters, electron density and electron temperature, will be discussed and compared for the CCWA with only brass wires and alternating brass and Al wires. The simulations with the novel Wire Ablation Dynamics Model that account for wire ablation will be performed to analyze the differences in implosion dynamics of the uniform and alternating compact cylindrical arrays.

Ouart, N. D.; Yilmaz, M. F.; Safronova, A. S.; Kantsyrev, V. L.; Esaulov, A. A.; Williamson, K. M.; Osborne, G. C.; Shrestha, I.; Weller, M. E. [Physics Department, University of Nevada, Reno, NV 89557 (United States); McBride, R. D.; Knapp, P. F.; Bell, K. S.; Pikuz, S. A.; Shelkovenko, T. A.; Greenly, J. B.; Hammer, D. A.; Kusse, B. R. [Cornell University, Ithaca, NY 14853 (United States)

2009-01-21T23:59:59.000Z

326

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers  

NLE Websites -- All DOE Office Websites (Extended Search)

Vacancy-Induced Nanoscale Wire Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Wednesday, 21 December 2005 00:00 Low-dimensional materials have gained much attention not only because of the nonstop march toward miniaturization in the electronics industry but also for the exotic properties that are inherent in their small size. One approach for creating low-dimensional structures is to exploit the nanoscale or atomic-scale features that exist naturally in the three-dimensional (bulk) form of materials. By this means, a group from the University of Washington has demonstrated a new way of creating one-dimensional nanoscale structures (nanowires) in the compound gallium selenide. In short, ordered lines of structural vacancies in the material stimulate the growth of "one-dimensional" structures less than 1 nanometer in width.

327

Annual Coded Wire Program Missing Production Groups, 1996 Annual Report.  

DOE Green Energy (OSTI)

In 1989 the Bonneville Power Administration (BPA) began funding the evaluation of production groups of juvenile anadromous fish not being coded-wire tagged for other programs. These groups were the ``Missing Production Groups``. Production fish released by the US Fish and Wildlife Service (USFWS) without representative coded-wire tags during the 1980`s are indicated as blank spaces on the survival graphs in this report. The objectives of the ``Missing Production Groups`` program are: to estimate the total survival of each production group, to estimate the contribution of each production group to various fisheries, and to prepare an annual report for all USFWS hatcheries in the Columbia River basin. Coded-wire tag recovery information will be used to evaluate the relative success of individual brood stocks. This information can also be used by salmon harvest managers to develop plans to allow the harvest of excess hatchery fish while protecting threatened, endangered, or other stocks of concern.

Pastor, S.M. [Fish and Wildlife Service, Vancouver, WA (United States). Columbia River Fisheries Program Office

1997-07-01T23:59:59.000Z

328

Wired World-Wide Web Interactive Remote Event Display  

Science Conference Proceedings (OSTI)

WIRED (World-Wide Web Interactive Remote Event Display) is a framework, written in the Java{trademark} language, for building High Energy Physics event displays. An event display based on the WIRED framework enables users of a HEP collaboration to visualize and analyze events remotely using ordinary WWW browsers, on any type of machine. In addition, event displays using WIRED may provide the general public with access to the research of high energy physics. The recent introduction of the object-oriented Java{trademark} language enables the transfer of machine independent code across the Internet, to be safely executed by a Java enhanced WWW browser. We have employed this technology to create a remote event display in WWW. The combined Java-WWW technology hence assures a world wide availability of such an event display, an always up-to-date program and a platform independent implementation, which is easy to use and to install.

De Groot, Nicolo

2003-05-07T23:59:59.000Z

329

Strongly coupled copper plasma generated by underwater electrical wire explosion  

Science Conference Proceedings (OSTI)

A number of theoretical approaches to the analysis of the parameters of a discharge channel consisting of strongly coupled plasma generated in the process of underwater electrical wire explosion are presented. The analysis is based on experimental results obtained from discharges employing Cu wire. The obtained experimental data included electrical measurements and optical observations from which information about the dynamics of the water flow was extrapolated. Numerical calculation based on a 1D magnetohydrodynamic model was used to simulate the process of underwater wire explosion. A wide range conductivity model was applied in this calculation and good agreement with a set of experimental data was obtained. A method of determining the average temperature of the discharge channel based on this model and experimental results is proposed, and the limits of this method's applicability are discussed.

Grinenko, A.; Gurovich, V.Tz.; Saypin, A.; Efimov, S.; Krasik, Ya.E.; Oreshkin, V.I. [Physics Department, Technion, 32000 Haifa (Israel); Institute of High Current Electronics, SB RAN, 634055 Tomsk (Russian Federation)

2005-12-15T23:59:59.000Z

330

Annual Coded Wire Tag Program; Washington Missing Production Groups, 1994 Annual Report.  

DOE Green Energy (OSTI)

The Bonneville Power Administration (BPA) funds the ``Annual Coded Wire Tag Program -- Missing Production Groups for Columbia River Hatcheries`` project. The Washington Department of Fish and Wildlife (WDFW) [formerly the Washington Department of Fisheries (WDF) and the Washington Department of Wildlife (WDW)], Oregon Department of Fish and Wildlife (ODFW) and the United States Fish and Wildlife Service (USFWS) all operate salmon and steelhead rearing programs in the Columbia River basin. The intent of the funding is to coded-wire tag at least one production group of each species at each Columbia Basin hatchery to provide a holistic assessment of survival and catch distribution over time. Data generated by this project contributes to WDFW`s obligations for representative tagging under the Endangered. Species Act (ESA) permit for operating Columbia Basin facilities. WDFW facilities operating outside the Snake River basin are required to have a Section 10, ``Incidental Take`` permit. Consistent with special conditions within this permit, WDFW has now reached it`s objective to tag representative groups from all WDFW Columbia Basin releases.

Fuss, Howard J.; Ashbrook, Charmane; Doty, Daniel (Washington Department of Fish and Wildlife, Olympia, WA)

1994-12-01T23:59:59.000Z

331

Modeling and simulation of a single phase photovoltaic inverter and investigation of switching strategies for harmonic minimization  

Science Conference Proceedings (OSTI)

The aim of this paper is to build an EMTDC model of a single phase photovoltaic inverter and to investigate switching strategies for harmonic minimisation. For the simulation of this model, the PSCAD/EMTDC software package was used and the waveforms ... Keywords: EMTDC model, harmonic minimization, single-phase photovoltaic inverter

St. Kourtesi; L. Ekonomou; A. Nakulas; G. P. Fotis; E. Zoulias

2007-05-01T23:59:59.000Z

332

A three-level buck converter to regulate a high-voltage DC-to-AC inverter  

E-Print Network (OSTI)

A three-level buck converter is designed and analyzed, and shown to be suitable as a high-voltage down converter as a pre-regulation stage for a 600 watt DC-to-AC power inverter. Topology selection for the inverter is ...

Schrock, Kenneth C

2008-01-01T23:59:59.000Z

333

DC-AC Cascaded H-Bridge Multilevel Boost Inverter With No Inductors for Electric/Hybrid Electric Vehicle Applications  

SciTech Connect

This paper presents a cascaded H-bridge multilevel boost inverter for electric vehicle (EV) and hybrid EV (HEV) applications implemented without the use of inductors. Currently available power inverter systems for HEVs use a dc-dc boost converter to boost the battery voltage for a traditional three-phase inverter. The present HEV traction drive inverters have low power density, are expensive, and have low efficiency because they need a bulky inductor. A cascaded H-bridge multilevel boost inverter design for EV and HEV applications implemented without the use of inductors is proposed in this paper. Traditionally, each H-bridge needs a dc power supply. The proposed design uses a standard three-leg inverter (one leg for each phase) and an H-bridge in series with each inverter leg which uses a capacitor as the dc power source. A fundamental switching scheme is used to do modulation control and to produce a five-level phase voltage. Experiments show that the proposed dc-ac cascaded H-bridge multilevel boost inverter can output a boosted ac voltage without the use of inductors.

Tolbert, Leon M [ORNL; Ozpineci, Burak [ORNL; Du, Zhong [ORNL; Chiasson, John N [ORNL

2009-01-01T23:59:59.000Z

334

Advanced, High-Reliability, System-Integrated 500kW PV Inverter Development: Final Subcontract Report, 29 September 2005 - 31 May 2008  

DOE Green Energy (OSTI)

Xantrex Technology accomplished subcontract goals of reducing parts cost, weight, and size of its 500-kW inverter by 25% compared to state-of-the-art PV inverters, while extending reliability by 25%.

West, R.

2008-08-01T23:59:59.000Z

335

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

BP Energy Company BP Energy Company OE Docket No. EA- 3 14 Order Authorizing Electricity Exports to Mexico Order No. EA-3 14 February 22,2007 BP Energy Company Order No. EA-314 I. BACKGROUND Exports of electricity from the United States to a foreign country are regulated by the Department of Energy (DOE) pursuant to sections 301(b) and 402(Q of the Department of Energy Organization Act (42 U.S.C. 7 15 l(b), 7172(f)) and require authorization under section 202(e) of the Federal Power Act (FPA) (16 U.S.C.S24a(e)) . On May 22,2006, BP Energy Company (BP Energy) applied to DOE for an authorization to transmit electric energy from the United States to Mexico as a power marketer. BP Energy proposes to purchase surplus electric energy from electric utilities and other suppliers within the United States and to export that energy to ~Mexico. The cnergy

336

United States  

Office of Legacy Management (LM)

Office of Research and EPA 600/R-941209 Environmental Protection Development January 1993 Agency Washington, DC 20460 Offsite Environmental 57,,7 Monitoring Report Radiation Monitoring Around United States Nuclear Test Areas, Calendar Year 1992 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY OFFICE OF RESEARCH AND DEVELOPMENT ENVIRONMENTAL MONITORING SYSTEMS LABORATORY-LAS VEGAS P.O. BOX 93478 LAS VEGAS. NEVADA 891 93-3478 702/798-2100 Dear Reader: Since 1954, the U.S. Environmental Protection Agency (EPA) and its predecessor the U.S, Public Health Service (PHs) has conducted radiological monitoring in the offsite areas around United States nuclear test areas. The primary objective of this monitoring has been the protection of the health and safety of

337

Control of Inverter-Connected Sources in Autonomous Microgrids Ian A. Hiskens Eric M. Fleming  

E-Print Network (OSTI)

Control of Inverter-Connected Sources in Autonomous Microgrids Ian A. Hiskens Eric M. Fleming interconnection strate- gies. The resulting microgrid concept allows sub-networks of sources and loads to maintain to a microgrid, explores controller behaviour. The investigation considers disconnection from the main grid

Hiskens, Ian A.

338

Late miocene/pliocene origin of the inverted metamorphism of the Central Himalaya  

SciTech Connect

The spatial association of intracontinental thrusting and inverted metamorphism, recognized in the Himalaya more than a century ago, has inspired continuing efforts to identify their causal relationship. Perhaps the best known sequence of inverted metamorphism is that found immediately beneath the Himalayan Main Central Thrust (MCT), generally thought to have been active during the Early Miocene. It has been widely assumed that the pattern of inverted metamorphism also developed at that time. Using a new approach, in situ Th-Pb dating of monazite included in garnet, we have discovered that the peak metamorphic recrystallization recorded in the footwall of the MCT fault occurred at ca. 5 Ma. The apparent inverted metamorphism resulted from activation of a broad shear zone beneath the MCT zone which juxtaposed two right-way-up metamorphic sequences. Recognition of this remarkably youthful phase of metamorphism resolves outstanding problems in Himalayan tectonics, such as why the MCT (and not the more recently initiated thrusts) marks the break in slope of the present day mountain range, and transcends others, such as the need for exceptional conditions to explain Himalayan anatexis.

Harrison, T.M.; Ryerson, F.J.; LeFort, P.; Yin, A. Lovera, O.M.

1997-01-01T23:59:59.000Z

339

Modeling the overshooting effect for CMOS inverter delay analysis in nanometer technologies  

Science Conference Proceedings (OSTI)

With the scaling of complementary metal-oxide-semiconductor (CMOS) technology into the nanometer regime, the overshooting effect due to the input-to-output coupling capacitance has more significant influence on CMOS gate analysis, especially on CMOS ... Keywords: CMOS inverter, gate delay, nanometer technology, overshooting time, switch-resistor model, timing analysis

Zhangcai Huang; Atsushi Kurokawa; Masanori Hashimoto; Takashi Sato; Minglu Jiang; Yasuaki Inoue

2010-02-01T23:59:59.000Z

340

Dynamic Model Validation of PV Inverters under Short-Circuit Conditions  

Science Conference Proceedings (OSTI)

Photovoltaic (PV) modules have dramatically decreased in price in the past few years, spurring the expansion of PV deployment. Residential and commercial rooftop installations are connected to the distribution network, large-scale installation PV power ... Keywords: photovoltaic, PV, dynamic model, validation, solar PV inverter, renewables

E. Muljadi, M. Singh, R. Bravo, V. Gevorgian

2013-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Optimal Inverter VAR Control in Distribution Systems with High PV Penetration  

E-Print Network (OSTI)

The intent of the study detailed in this paper is to demonstrate the benefits of inverter var control on a fast timescale to mitigate rapid and large voltage fluctuations due to the high penetration of photovoltaic generation and the resulting reverse power flow. Our approach is to formulate the volt/var control as a radial optimal power flow (OPF) problem to minimize line losses and energy consumption, subject to constraints on voltage magnitudes. An efficient solution to the radial OPF problem is presented and used to study the structure of optimal inverter var injection and the net benefits, taking into account the additional cost of inverter losses when operating at non-unity power factor. This paper will illustrate how, depending on the circuit topology and its loading condition, the inverter's optimal reactive power injection is not necessarily monotone with respect to their real power output. The results are demonstrated on a distribution feeder on the Southern California Edison system that has a very ...

Farivar, Masoud; Clarke, Christopher; Low, Steven

2011-01-01T23:59:59.000Z

342

DC-AC Inverters for Static Condenser and Dynamic Voltage Restorer Applications  

Science Conference Proceedings (OSTI)

There has been significant recent interest in general classes of power electronic-based active power conditioners such as static condensers and dynamic voltage restorers. These systems are discussed in this paper with a focus on the inverter output stage. ... Keywords: Power Quality, Static var Compensators, Custom Power

Steven R. Ashcraft; S. Mark Halpin

1996-03-01T23:59:59.000Z

343

Fundamental Frequency Switching Control of Seven-Level Hybrid Cascaded H-bridge Multilevel Inverter  

Science Conference Proceedings (OSTI)

This paper presents a cascaded H-bridge multilevel inverter that can be implemented using only a single dc power source and capacitors. Standard cascaded multilevel inverters require n dc sources for 2n + 1 levels. Without requiring transformers, the scheme proposed here allows the use of a single dc power source (e.g., a battery or a fuel cell stack) with the remaining n-1 dc sources being capacitors, which is referred to as hybrid cascaded H-bridge multilevel inverter (HCMLI) in this paper. It is shown that the inverter can simultaneously maintain the dc voltage level of the capacitors and choose a fundamental frequency switching pattern to produce a nearly sinusoidal output. HCMLI using only a single dc source for each phase is promising for high-power motor drive applications as it significantly decreases the number of required dc power supplies, provides high-quality output power due to its high number of output levels, and results in high conversion efficiency and low thermal stress as it uses a fundamental frequency switching scheme. This paper mainly discusses control of seven-level HCMLI with fundamental frequency switching control and how its modulation index range can be extended using triplen harmonic compensation.

Du, Zhong [ORNL; Chiasson, John N [ORNL; Ozpineci, Burak [ORNL; Tolbert, Leon M [ORNL

2009-01-01T23:59:59.000Z

344

Multilevel Cascade H-bridge Inverter DC Voltage Estimation Through Output Voltage Sensing  

E-Print Network (OSTI)

- level inverters with symmetric supply," in Proc. 35th IEEE Power Electronics Specialists Conference, vol Knoxville,USA ffilho@utk.edu, tolbert@utk.edu Burak Ozpineci Energy & Transportation Science Division Oak total harmonic distortion), and have less switching losses. However, they need more components, driver

Tolbert, Leon M.

345

Conditions for the invertibility of the isoparametric mapping for hexahedral finite elements  

Science Conference Proceedings (OSTI)

We consider the isoparametric mapping, which maps a given reference element onto a global element given by its vertices, for trilinear finite elements on hexahedra. We present an algorithm that checks the positivity of the Jacobian determinant depending ... Keywords: hexahedral finite elements, invertibility, isoparametric mapping

P. Knabner; S. Korotov; G. Summ

2003-12-01T23:59:59.000Z

346

Improving tide-gauge data processing: A method involving tidal frequencies and inverted barometer effect  

Science Conference Proceedings (OSTI)

Sea level measured at tide-gauge stations is affected by undesired events such as spikes, gaps, steps and time shifts. The presence of these instrumental failures seriously decreases the quality of each analysis done using the record. Furthermore, they ... Keywords: Data processing, Inverted barometer effect, Ocean tides, Sea-level changes, Tide-gauge observations

E. Gil; C. de Toro

2005-10-01T23:59:59.000Z

347

On the invertibility of the XOR rotations of a binary word  

E-Print Network (OSTI)

We prove the following result regarding operations on a binary word whose length is a power of two: computing the exclusive-or of a number of rotated versions of the word is an invertible (one-to-one) operation if and only ...

Rivest, Ronald L.

348

CANDLE BURNING IN AN INVERTED JAR OVER WATER IN A TROUGH EXPERIMENT: SCIENCE TEACHERS' CONCEPTIONS  

E-Print Network (OSTI)

CANDLE BURNING IN AN INVERTED JAR OVER WATER IN A TROUGH EXPERIMENT: SCIENCE TEACHERS' CONCEPTIONS contains about 20% oxygen despite our knowledge that burning in a closed environment does not consume during burning of carbon in oxygen (air) and the solubility rate of carbon dioxide in water

Knill, Oliver

349

Common Mode Voltage in case of Transformerless PV Inverters Connected to the Grid  

E-Print Network (OSTI)

through the parasitic capacitance of the PV panels, can reach very high values. A common-mode model based grid connected PV system with the modeled parasitic capacitances, marked with grey lines, presentCommon Mode Voltage in case of Transformerless PV Inverters Connected to the Grid T. KEREKES* R

Kerekes, Tamas

350

Economical design of gate-commutated inverters for the grid-tied distributed generators  

Science Conference Proceedings (OSTI)

The cost-effectiveness of small distributed generating resources is vital to the success of the high penetration of distributed generators within the microgrid concept. A common mechanism is the use of highly efficient inverters following the electrical storage systems. In this paper

Mujahidul Islam; Adedamola Omole; Arif Islam; Alexander Domijan Jr.

2011-01-01T23:59:59.000Z

351

The Control Strategy Based on Improved Droop Method of Microgrid-Connected Inverters  

Science Conference Proceedings (OSTI)

A control strategy of inverters is proposed based on the control requirements of the distributed power sources in the microgrid, which realizes the seamless transition between the grid-connected mode and islanding mode. When the microgrid is connected ... Keywords: improved droop method, tranditional droop method, PQ control, V/f control

Sha Tian; Xiangqian Tong; Biying Ren

2010-06-01T23:59:59.000Z

352

Using the Inverted Echo Sounder to Measure Vertical Profiles of Gulf Stream Temperature and Geostrophic Velocity  

Science Conference Proceedings (OSTI)

The methodology for converting the travel time measurement of the inverted echo sounder (IES) into an amplitude of the first baroclinic dynamical mode, A1, is presented. For a Gulf Stream IES record the so-generated A1(t) time series is used to ...

Robert S. Pickart; D. Randolph Watts

1990-02-01T23:59:59.000Z

353

Early Swedish Contribution to Oceanography: Nils Gissler (1715–71) and the Inverted Barometer Effect  

Science Conference Proceedings (OSTI)

Nils Gissler (1715–71) was a remarkable Swedish scientist and physician who appears to be the first to describe the inverted barometer effect, based on joint observations of sea level and atmospheric pressure at Härnösand, a small town on the ...

Gunnar I. Roden; H. Thomas Rossby

1999-04-01T23:59:59.000Z

354

Observations of Inertia-Gravity Waves in the Atlantic from Inverted Echo Sounders during FGGE  

Science Conference Proceedings (OSTI)

The study is based on observations from inverted echo sounders anchored near the equator in the western Atlantic Ocean. It appears to be a good method of detecting inertia-gravity waves with large vertical scale. The spectral analysis of the ...

Silvia Garzoli; Eli Joel Katz

1981-11-01T23:59:59.000Z

355

FPGA Implementation of Space Vector PWM Technique for Voltage Source Inverter Fed Induction Motor Drive  

Science Conference Proceedings (OSTI)

This paper presents implementation of Space Vector Pulse Width Modulation (SVPWM) technique for three phase Voltage Source Inverter (VSI) using Field Programmable Gate Array (FPGA). Variable voltage and frequency supply to ac drives is invariably obtained ... Keywords: VSI, SVPWM, FPGA, Induction Motor

R. Rajendran; N. Devarajan

2009-12-01T23:59:59.000Z

356

Finite Element Simulation of Residual Stresses in Thermo-coupled Wire Drawing Process  

Science Conference Proceedings (OSTI)

The objective of this paper is to calculate residual stress in drawn wire taking into account induced temperature due to plastic dissipation energy. Finite element analysis (FEA) for the simulation of wire drawing is applied. The general purpose FEA ...

R. Iankov; A. Van Bael; P. Van Houtte

2000-06-01T23:59:59.000Z

357

The Effect of Prongs in the Measurement of Atmospheric Turbulence with Fine-Wire Resistance Transducers  

Science Conference Proceedings (OSTI)

The response of the fine-wire resistance temperature transducer was analyzed including the effects of (i) conducive heat transfer between wire and the supporting prong and (ii) a thermal boundary layer, which can form around the prongs especially ...

V. P. Singh; F. Eaton; R. Rubio

1992-04-01T23:59:59.000Z

358

THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT AND POWER FACILITIES THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT AND POWER FACILITIES Section...

359

STUDY OF THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

STUDY OF THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT AND POWER FACILITIE STUDY OF THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT AND POWER...

360

First Test Results of the New LANSCE Wire Scanner  

SciTech Connect

The Beam Diagnostics and Instrumentation Team (BDIT) at Los Alamos National Laboratory's LANSCE facility is presently developing a new and improved wire scanner diagnostics system controlled by National Instrument's cRIO platform. This paper describes the current state of development of the control system along with the results gathered from the latest actuator motion performance and accelerator-beam data acquisition tests.

Sedillo, James Daniel [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Leaching Studies for Metals Recovery from Waste Printed Wiring ...  

Science Conference Proceedings (OSTI)

Presentation Title, Leaching Studies for Metals Recovery from Waste Printed Wiring ... of the Chemical Changes and Surface Properties of Carbonated Waste Cement ... Flux for Basic Oxygen Steel Making Using Waste Oxides of Steel Plant ... Heat Treatment of Black Dross for the Production of a Value Added Material - A

362

A Laser-Wire System at the ATF Extraction Line  

Science Conference Proceedings (OSTI)

A new laser-wire (LW) system has been installed at the ATF extraction line at KEK, Tsukuba. The system aims at a micron-scale laser spot size and employs a mode-locked laser system. The purpose-built interaction chamber, light delivery optics, and lens systems are described, and the first results are presented.

Boogert, S.T.; Blair, G.; Boorman, G.; Bosco, A.; Deacon, L.; Driouichi, C.; Karataev, P.; /Royal Holloway, U. of London; Kamps, T.; /BESSY, Berlin; Delerue, N.; Dixit, S.; Foster, B.; Gannaway, F.; Howell, D.F.; Qureshi, M.; Reichold, A.; Senanayake, R.; /Oxford U.; Aryshev, A.; Hayano, H.; Kubo, K.; Terunuma, N.; Urakawa, J.; /KEK, Tsukuba /Liverpool U. /Cockcroft Inst. Accel. Sci. Tech. /SLAC

2007-02-12T23:59:59.000Z

363

Optimizing the panel area of a photovoltaic system in relation to the static inverter - practical results  

Science Conference Proceedings (OSTI)

Due to poor sizing grid-connected photovoltaic systems often underexploit the capacity of the static inverter resulting in reduced efficiency and an increase in the cost of energy. The objectives of the present project are: to show the effects of an oversized solar module area on the efficiency and profitability of a system, and to define the conditions required for oversizing. The simulations performed in a previous phase of the project showed that higher profitability was attained with the power of the photovoltaic field area sized between 40 and 80% (depending on the conditions) above the nominal power of the static inverter. The validation of these results was obtained from two sites: Herdern (near Zurich/Switzerland/lat 47.5 {degree}N/long 8.4 {degree}E/410 m above sea level) with three installations of 4.4, 3.8 and 3.4 kW S.T.C. for an inverter of nominal 3.3 kW a.c.; and Lausanne (Switzerland/lat 46.6 {degree}N/long 6.6 {degree}E/410 m above sea level) with three installations of 5.6, 4.0 and 2.4 kW S.T.C. for a static inverter of nominal 3.4 kW a.c. Detailed results are available for tests performed on both installations. The results clearly demonstrate the difference between optimal energy production and optimal energy cost. Finally, recommendations are given for optimization calculations of the photovoltaic module area and new construction directives for static inverters with a view to oversizing are issued. 5 refs., 6 figs., 8 tabs.

Keller, L. [Bureau d`Etudes Keller-Burnier, Lavigny (Switzerland); Affolter, P. [Ecole Polytechnique Federale, Lausanne (Switzerland)

1995-07-01T23:59:59.000Z

364

Extended Constant Power Speed Range of the Brushless DC Motor Through Dual Mode Inverter Control  

SciTech Connect

The trapezoidal back electromotive force (emf) brushless direct current (dc) motor (BDCM) with surface-mounted magnets has high-power density and efficiency especially when rare-earth magnet materials are used. Traction applications, such as electric vehicles, could benefit significantly from the use of such motors. Unfortunately, a practical means for driving the motor over a constant power speed ratio (CPSR) of 5:1 or more has not yet been developed. A key feature of these motors is that they have low internal inductance. The phase advance method is effective in controlling the motor power over such a speed range, but the current at high speed may be several times greater than that required at the base speed. The increase in current during high-speed operation is due to the low motor inductance and the action of the bypass diodes of the inverter. The use of such a control would require increased current rating of the inverter semiconductors and additional cooling for the inverter, where the conduction losses increase proportionally with current, and especially for the motor, where the losses increase with the square of the current. The high current problems of phase advance can be mitigated by adding series inductance; however, this reduces power density, requires significant increase in supply voltage, and leaves the CPSR performance of the system highly sensitive to variations in the available voltage. A new inverter topology and control scheme has been developed that can drive low-inductance BDCMs over the CPSR that would be required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC). It is shown that the BDCM has an infinite CPSR when it is driven by the DMIC.

Lawler, J.S.

2000-06-23T23:59:59.000Z

365

EAC Recommendations for DOE Action Regarding Non-Wires Solutions - October 17, 2012  

Energy.gov (U.S. Department of Energy (DOE))

EAC Recommendations for DOE Action Regarding Non-Wires Solutions, approved at the October 15-16, 2012 EAC Meeting.

366

Beam profile measurement with flying wires at the Fermilab Recycler Ring  

Science Conference Proceedings (OSTI)

Flying wires were installed at the Fermilab Recycler Ring for transverse beam profile measurement for both proton and antiproton beams. The following note describes the system configuration, calibration and resolution of the flying wire system, interactions between the wires and the beam, as well as analysis of the transverse beam profile in the presence of a stochastic cooling system.

Carcagno, R.; Pishchalnikov, Yu.; Krider, J.; Hu, M.; Lorman, E.; Marchionni, A.; Pordes, S.; Wilson, P.; Zagel, J.; /Fermilab

2005-05-01T23:59:59.000Z

367

Evaluation of the Effect of LOCA Testing on Polyimide Insulated Wire Subjected to Bending: Volume 2  

Science Conference Proceedings (OSTI)

Due in part to mishandling and improper installation, polyimide insulated wire has exhibited degradation in some military aircraft and power plant applications. This report presents the results of a Rochester Gas & Electric (RG&E) test program to determine the effects of bending on aged polyimide lead wire and subsequent performance of this wire during a nuclear plant design basis accident.

1998-05-19T23:59:59.000Z

368

Study of operation of a current-controlled power inverter with hysteretic current controllers under various control options  

SciTech Connect

Inverters with hysteretic current controllers have constituted one of the most common types of CD/AC power converters. They are used in high-performance AC drive systems and as a source of reactive power of power-conditioning systems. Their main feature consists in the presence of a current feedback which allows the avoidance sophisticated open-loop control strategies. Existing current-controlled inverters with hysteretic current controllers (CCI-HCC) result in the dependence of the inverter on its load characteristics, poor inverter utilization due to too much or too little supply voltage, and the current error in the tolerance band which causes deterioration of operation of the supplied motor. In this work, techniques and results of modeling the operation of a current-controlled three-phase power inverter with hysteretic current controllers are presented. Four symmetrical control options are considered: the so called independent type, semi-dependent type (a), semi-dependent type (b), and dependent type, each using three current controllers. Performance indices of an exemplary inverter-induction motor set and a RL-loaded inverter with two different mechanical loads and time constants, otherwise difficult to compute, were determined.

Rashidi, N.H.

1988-01-01T23:59:59.000Z

369

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

E-T Global Energy, LLC E-T Global Energy, LLC OE Docket No. EA-381 Order Authorizing Electricity Exports to Mexico Order No. EA-381 June 10, 2011 I. BACKGROUND E-T Global Energy, LLC Order No. EA-381 Exports of electricity from the United States to a foreign country are regulated by the Department of Energy (DOE) pursuant to sections 301(b) and 402(f) of the Department ofEnergy Organization Act (42 U.S.C. 7151(b), 7172(f)) and require authorization under section 202(e) ofthe Federal Power Act (FPA) (16 U.S.C.824a(e)) 1 * On May 10,2011, DOE received an application from E-T Global Energy, LLC (E-T Global) for authority to transmit electric energy from the United States to Mexico for five years as a power marketer using existing international transmission facilities. E-

370

United States  

Office of Legacy Management (LM)

WASHINGTON, TUESDAY, JUNE 28, 1983 @nngmeional Ruord United States of America .__ -- . . ,- PROCEEDINGS AND DEBATES OF THE 9@ CONGRESS, FIRST SESSION United States Government Printing Office SUPERINTENDENT OF DOCUMENTS Washmgton, D C 20402 OFFICIAL BUSINESS Penalty Ior pwate use. $xX Congresstonal Record (USPS 087-390) Postage and Fees Pad U S Government Prlnhng 0ffv.X 375 SECOND CLASS NEWSPAPER H.4578 ' C.QNGRESSIONAL RECORD - HOUSE June 28, 1983 H.J. Res. 273: Mr. BOUND. Mr. W~.XMAN. Mr. OBERSTAR, Mr. BEDELL. Mr. BONER of Tennessee, Mr. OWENS. Mr. DAUB, Mr. CONTE. Mr. RAHALL; Mr. GRAY, Mr. VANDER JACT. Mr. TRAKLER, and Mr. Vxrrro. H. Con. Res. 107: Mr. KASICH. Mr. AUCOIN. Mr. CARPER, and Mr. SIZHFIJER. H. Con. Res. 118: Mr. FISH. Mr. LANTOS.

371

United States  

Office of Legacy Management (LM)

ongrees;ional Record ongrees;ional Record United States of America __._ -.. I. :- PROCEEDINGS AND DEBATES OF THE 9tth CONGRESS, FIRST SESSION United States Government Printing Office SUPERINTENDENT OF DOCUMENTS Washmcqton. Cl C 20402 OFFICIAL BUSINESS Penalty Ior pwate use. $300 Congressmal Record (USPS 087-390) Postage and Fees Pad U S Governme3n:jPnntmg OfIce SECOND CLASS NEWSPAPER H.4578 ' June 28, 1983 -: I H.J. Res. 273: Mr. BOLAND, Mr. WA-. Mr. OBERSTAFC, M' r. BEDELL, Mr. BONER of Tennessee, Mr. OWENS. Mr. DAUB. Mr. CONTE. Mr. RAHALL,. Mr. GRAY, Mr. VANDER JAGT. Mr. TRAKLER. and Mr. VENTO. H. Con. Res. iO7: Mr. KASICH. Mr. ALCOIN. Mr. CARPER. and Mr. SCHEUER. H. Con. Res. 118: Mr. FISH, Mr. LANTOS. Mr. KILDEE. Mr. SOLARZ Mr. Bmrr, Mr. BELWLL, Mr. RANG~L, Mr. DYMALLY. Mr.

372

Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California (Fact Sheet)  

SciTech Connect

K. Hovnanian Homes constructed a 2,253-ft single-story slab-on-grade ranch house for an occupied test house (new construction) in Roseville, California. One year of monitoring and analysis focused on the effectiveness of the space conditioning system at maintaining acceptable temperature and relative humidity levels in several rooms of the home, as well as room-to-room differences and the actual measured energy consumption by the space conditioning system. In this home, the air handler unit (AHU) and ducts were relocated to inside the thermal boundary. The AHU was relocated from the attic to a mechanical closet, and the ductwork was located inside an insulated and air-sealed bulkhead in the attic. To describe the performance and comfort in the home, the research team selected representative design days and extreme days from the annual data for analysis. To ensure that temperature differences were within reasonable occupant expectations, the team followed Air Conditioning Contractors of America guidance. At the end of the monitoring period, the occupant of the home had no comfort complaints in the home. Any variance between the modeled heating and cooling energy and the actual amounts used can be attributed to the variance in temperatures at the thermostat versus the modeled inputs.

Not Available

2013-10-01T23:59:59.000Z

373

Hardware Development of a Laboratory-Scale Microgrid Phase 1--Single Inverter in Island Mode Operation: Base Year Report, December 2000 -- November 2001  

SciTech Connect

This report summarizes the activities of the first year of a three-year project to develop control software for micro-source distributed generation systems. The focus of this phase was on internal energy storage requirements, the modification of an off-the-shelf motor drive system inverter to supply utility-grade ac power, and a single inverter system operating in island mode. The report provides a methodology for determining battery energy storage requirements, a method for converting a motor drive inverter into a utility-grade inverter, and typical characteristics and test results of using such an inverter in a complex load environment.

Venkataramanan, G.; Illindala, M. S.; Houle, C.; Lasseter, R. H.

2002-11-01T23:59:59.000Z

374

A Five-Level Three-Phase Cascade Multilevel Inverter Using a Single DC Source for a PM Synchronous Motor Drive  

SciTech Connect

The interest here is in using a single DC power source to construct a 3-phase 5-level cascade multilevel inverter to be used as a drive for a PM traction motor. The 5-level inverter consists of a standard 3-leg inverter (one leg for each phase) and an H-bridge in series with each inverter leg, which use a capacitor as a DC source. It is shown that one can simultaneously maintain the regulation of the capacitor voltage while achieving an output voltage waveform which is 25% higher than that obtained using a standard 3-leg inverter by itself.

Ozpineci, Burak [ORNL; Chiasson, John N [ORNL; Tolbert, Leon M [ORNL

2007-01-01T23:59:59.000Z

375

A Five-Level Cascade Multilevel Inverter Three-Phase Motor Drive Using a Single DC Source  

SciTech Connect

A method is presented showing that a 5-level cascade multilevel inverter for a three-phase permanent magnet sychronous motor drive can be implemented using only a single DC link to supply a standard 3-leg inverter along with three full H-bridges supplied by capacitors. It is shown that the capacitor voltages can be regulated while achieving an output voltage waveform that is 20% greater than that obained using the standard 3-leg inverter alone. Finally conditions are given in terms of the power factor and modulation index that determine when the capacitor voltage can regulated.

Chiasson, J. N. [University of Tennessee, Knoxville (UTK)

2006-10-01T23:59:59.000Z

376

Analysis, design and optimization of the LCC resonant inverter as a high-intensity discharge lamp ballast  

SciTech Connect

A complete study of the clamped-mode (CM) series-parallel (LCC) resonant inverter together with some of the control-to-output characteristics are presented in this paper. Also, a new control method for the CM LCC resonant inverter is introduced. With this method, the inverter is forced to operate with optimum commutations and without handling reactive energy, thus minimizing both switching and conduction losses. The corresponding design procedure is illustrated with a design example. Finally, some experimental results obtained from a prototype at the laboratory are also shown to validate the analysis and evaluate the proposed control method.

Alonso, J.M.; Blanco, C.; Lopez, E.; Calleja, A.J.; Rico, M. [Univ. de Oviedo, Gijon (Spain). Dept. de Ingenieria Electrica y Electronica

1998-05-01T23:59:59.000Z

377

Program on Technology Innovation: Five-Wire Feasibility on Con Edison's Distribution Systems  

Science Conference Proceedings (OSTI)

The feasibility of a five-wire distribution system has gained interest in recent years. The five-wire distribution system features an isolated neutral that carries unbalanced load current. The main advantages of the five-wire distribution system include lower stray voltage and magnetic fields and easier detection of high-impedance faults. Under normal conditions, the five-wire design operates very similar to the four-wire design with one major exception all the return current is confined to the neutral t...

2006-09-05T23:59:59.000Z

378

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

5 5 United States Department of Energy Southeastern Power Administration Wholesale Power Rate Schedule CC-1-I Availability: This rate schedule shall be available to public bodies and cooperatives served through the facilities of Carolina Power & Light Company, Western Division (hereinafter called the Customers). Applicability: This rate schedule shall be applicable to electric capacity and energy available from the Dale Hollow, Center Hill, Wolf Creek, Cheatham, Old Hickory, Barkley, J. Percy Priest, and Cordell Hull Projects (all of such projects being hereinafter called collectively the "Cumberland Projects") and sold in wholesale quantities. Character of Service: The electric capacity and energy supplied hereunder will be three-phase alternating

379

Dynamic Model Validation of PV Inverters Under Short-Circuit Conditions: Preprint  

SciTech Connect

Photovoltaic (PV) modules have dramatically decreased in price in the past few years, spurring the expansion of photovoltaic deployment. Residential and commercial rooftop installations are connected to the distribution network; large-scale installation PV power plants (PVPs) have benefited from tax incentives and the low cost of PV modules. As the level penetration of PV generation increases, the impact on power system reliability will also be greater. Utility power system planners must consider the role of PV generation in power systems more realistically by representing PV generation in dynamic stability analyses. Dynamic models of PV inverters have been developed in the positive sequence representation. NREL has developed a PV inverter dynamic model in PSCAD/EMTDC. This paper validates the dynamic model with an actual hardware bench test conducted by Southern California Edison's Distributed Energy Resources laboratory. All the fault combinations -- symmetrical and unsymmetrical -- were performed in the laboratory. We compare the simulation results with the bench test results.

Muljadi, E.; Singh, M.; Bravo, R.; Gevorgian, V.

2013-03-01T23:59:59.000Z

380

An Inverter Packaging Scheme for an Integrated Segmented Traction Drive System  

Science Conference Proceedings (OSTI)

The standard voltage source inverter (VSI), widely used in electric vehicle/hybrid electric vehicle (EV/HEV) traction drives, requires a bulky dc bus capacitor to absorb the large switching ripple currents and prevent them from shortening the battery s life. The dc bus capacitor presents a significant barrier to meeting inverter cost, volume, and weight requirements for mass production of affordable EVs/HEVs. The large ripple currents become even more problematic for the film capacitors (the capacitor technology of choice for EVs/HEVs) in high temperature environments as their ripple current handling capability decreases rapidly with rising temperatures. It is shown in previous work that segmenting the VSI based traction drive system can significantly decrease the ripple currents and thus the size of the dc bus capacitor. This paper presents an integrated packaging scheme to reduce the system cost of a segmented traction drive.

Su, Gui-Jia [ORNL; Tang, Lixin [ORNL; Ayers, Curtis William [ORNL; Wiles, Randy H [ORNL

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Fabrication and Evaluation of a High Performance SiC Inverter for Wireless Power Transfer Applications  

SciTech Connect

In this study, a high power density SiC high efficiency wireless power transfer converter system via inductive coupling has been designed and developed. The detailed power module design, cooling system design and power stage development are presented. The successful operation of rated power converter system demonstrates the feasible wireless charging plan. One of the most important part of this study is the wind bandgap devices packaged at the Oak Ridge National Laboratory (ORNL) using the in-house packaging technologies by employing the bare SiC dies acquired from CREE, which are rated at 50 A / 1200 V each. These packaged devices are also inhouse tested and characterized using ORNL s Device Characterization Facility. The successful operation of the proposed inverter is experimentally verified and the efficiency and operational characteristics of the inverter are also revealed.

Onar, Omer C [ORNL] [ORNL; Campbell, Steven L [ORNL] [ORNL; Ning, Puqi [ORNL] [ORNL; Miller, John M [ORNL] [ORNL; Liang, Zhenxian [ORNL] [ORNL

2013-01-01T23:59:59.000Z

382

Hydrodynamics of adiabatic inverted annular flow: an experimental study. [PWR; BWR  

SciTech Connect

For low-quality film boiling in tubes or rod bundles, the flow pattern may consist of a liquid jet-like core surrounded by a vapor annulus, i.e., inverted annular flow. The stability, shape, and break-up mechanisms of this liquid core must be understood in order to model correctly this regime and to develop appropriate interfacial transfer correlations. This paper reports on a study in which inverted annular flow was simulated in an adiabatic system. Turbulent water jets, issuing downward from long-aspect nozzles were enclosed within cocurrent gas annuli. Jet-core diameter and velocity, and gas-annulus diameter, velocity, and species were varied, yielding liquid Reynolds numbers up to 33,000, void fractions from 0.29 to 0.95, and relative velocities from near zero to over 80 m/s. Jet-core break-up lengths and secondarily, core break-up mechanisms, were observed visually, using strobe lighting.

De Jarlais, G.; Ishii, M.

1983-01-01T23:59:59.000Z

383

Dynamic Model Validation of PV Inverters Under Short-Circuit Conditions: Preprint  

SciTech Connect

Photovoltaic (PV) modules have dramatically decreased in price in the past few years, spurring the expansion of photovoltaic deployment. Residential and commercial rooftop installations are connected to the distribution network; large-scale installation PV power plants (PVPs) have benefited from tax incentives and the low cost of PV modules. As the level penetration of PV generation increases, the impact on power system reliability will also be greater. Utility power system planners must consider the role of PV generation in power systems more realistically by representing PV generation in dynamic stability analyses. Dynamic models of PV inverters have been developed in the positive sequence representation. NREL has developed a PV inverter dynamic model in PSCAD/EMTDC. This paper validates the dynamic model with an actual hardware bench test conducted by Southern California Edison's Distributed Energy Resources laboratory. All the fault combinations -- symmetrical and unsymmetrical -- were performed in the laboratory. We compare the simulation results with the bench test results.

Muljadi, E.; Singh, M.; Bravo, R.; Gevorgian, V.

2013-03-01T23:59:59.000Z

384

Shootthrough fault protection system for bipolar transistors in a voltage source transistor inverter  

SciTech Connect

Faulted bipolar transistors in a voltage source transistor inverter are protected against shootthrough fault current, from the filter capacitor of the d-c voltage source which drives the inverter over the d-c bus, by interposing a small choke in series with the filter capacitor to limit the rate of rise of that fault current while at the same time causing the d-c bus voltage to instantly drop to essentially zero volts at the beginning of a shootthrough fault. In this way, the load lines of the faulted transistors are effectively shaped so that they do not enter the second breakdown area, thereby preventing second breakdown destruction of the transistors.

Wirth, W.F.

1982-01-12T23:59:59.000Z

385

Theoretical analysis and experimental validation of a novel multilevel inverter topology for renewable energy interfacing applications  

Science Conference Proceedings (OSTI)

This paper presents a new topological structure for symmetrical cascaded multilevel inverters. The proposed circuit consists of cross-connected separate symmetrical DC sources which can generate number of levels equal to that of a cascaded H-bridge topology with reduced number of power switches. It is especially suitable for utility interfacing of renewable energy sources. It also offers the possibility of a transformer less and filter less operation. The working principle of the proposed topology is explained with the help of a single-phase five level inverter. Simulation results are obtained in matlab/simulink environment and are verified experimentally on a laboratory prototype. An exhaustive comparison of the proposed topology is made with the classical cascaded H-bridge topology

Krishna Kumar Gupta

2012-01-01T23:59:59.000Z

386

Wire Making Techniques - HTS Coated Conductors - Fact Sheet  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Rolling Assisted Biaxially Textured Substrates (RABiTS Rolling Assisted Biaxially Textured Substrates (RABiTS TM ) coated conductors, characterized by their low cost and simple architecture, promise to meet industry price and performance targets. Introduction Since the discovery of high-temperature superconductors (HTS), notably YBa 2 Cu 3 O 7 (YBCO), researchers at the U.S. Department of Energy's (DOE) national laboratories have searched for ways to manufacture affordable flexible wires with high current density. One of the chief obstacles to the manufacture of commercial lengths of YBCO wire has been the phenomenon of weak links, which exist where current crosses a non-superconducting region such as a grain boundary. By aligning grains carefully, low angle boundaries between superconducting grains are assured, which

387

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers  

NLE Websites -- All DOE Office Websites (Extended Search)

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Low-dimensional materials have gained much attention not only because of the nonstop march toward miniaturization in the electronics industry but also for the exotic properties that are inherent in their small size. One approach for creating low-dimensional structures is to exploit the nanoscale or atomic-scale features that exist naturally in the three-dimensional (bulk) form of materials. By this means, a group from the University of Washington has demonstrated a new way of creating one-dimensional nanoscale structures (nanowires) in the compound gallium selenide. In short, ordered lines of structural vacancies in the material stimulate the growth of "one-dimensional" structures less than 1 nanometer in width.

388

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers  

NLE Websites -- All DOE Office Websites (Extended Search)

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Low-dimensional materials have gained much attention not only because of the nonstop march toward miniaturization in the electronics industry but also for the exotic properties that are inherent in their small size. One approach for creating low-dimensional structures is to exploit the nanoscale or atomic-scale features that exist naturally in the three-dimensional (bulk) form of materials. By this means, a group from the University of Washington has demonstrated a new way of creating one-dimensional nanoscale structures (nanowires) in the compound gallium selenide. In short, ordered lines of structural vacancies in the material stimulate the growth of "one-dimensional" structures less than 1 nanometer in width.

389

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers  

NLE Websites -- All DOE Office Websites (Extended Search)

Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Vacancy-Induced Nanoscale Wire Structure in Gallium Selenide Layers Print Low-dimensional materials have gained much attention not only because of the nonstop march toward miniaturization in the electronics industry but also for the exotic properties that are inherent in their small size. One approach for creating low-dimensional structures is to exploit the nanoscale or atomic-scale features that exist naturally in the three-dimensional (bulk) form of materials. By this means, a group from the University of Washington has demonstrated a new way of creating one-dimensional nanoscale structures (nanowires) in the compound gallium selenide. In short, ordered lines of structural vacancies in the material stimulate the growth of "one-dimensional" structures less than 1 nanometer in width.

390

Wire Scanner Beam Profile Measurements: LANSCE Facility Beam Development  

SciTech Connect

The Los Alamos Neutron Science Center (LANSCE) is replacing Wire Scanner (WS) beam profile measurement systems. Three beam development tests have taken place to test the new wire scanners under beam conditions. These beam development tests have integrated the WS actuator, cable plant, electronics processors and associated software and have used H{sup -} beams of different beam energy and current conditions. In addition, the WS measurement-system beam tests verified actuator control systems for minimum profile bin repeatability and speed, checked for actuator backlash and positional stability, tested the replacement of simple broadband potentiometers with narrow band resolvers, and tested resolver use with National Instruments Compact Reconfigurable Input and Output (cRIO) Virtual Instrumentation. These beam tests also have verified how trans-impedance amplifiers react with various types of beam line background noise and how noise currents were not generated. This paper will describe these beam development tests and show some resulting data.

Gilpatrick, John D. [Los Alamos National Laboratory; Batygin, Yuri K. [Los Alamos National Laboratory; Gonzales, Fermin [Los Alamos National Laboratory; Gruchalla, Michael E. [Los Alamos National Laboratory; Kutac, Vincent G. [Los Alamos National Laboratory; Martinez, Derwin [Los Alamos National Laboratory; Sedillo, James Daniel [Los Alamos National Laboratory; Pillai, Chandra [Los Alamos National Laboratory; Rodriguez Esparza, Sergio [Los Alamos National Laboratory; Smith, Brian G. [Los Alamos National Laboratory

2012-05-15T23:59:59.000Z

391

PARALLEL ION BEAM PROFILE SCAN USING LASER WIRE  

Science Conference Proceedings (OSTI)

We report on the world s first experiment of a parallel profile scan of the hydrogen ion (H-) beam using a laser wire system. The system was developed at the superconducting linac of the Spallation Neutron Source (SNS) accelerator complex. The laser wire profile scanner is based on a photo-detachment process and therefore can be conducted on an operational H- beam in a nonintrusive manner. The parallel profile scanning system makes it possible to simultaneously measure profiles of the 1-MW neutron production H- beam at 9 different locations of the linac by using a single light source. This paper describes the design, optical system and software platform development, and measurement results of the parallel profile scanning system.

Liu, Yun [ORNL; Aleksandrov, Alexander V [ORNL; Huang, Chunning [ORNL; Long, Cary D [ORNL; Dickson, Richard W [ORNL

2013-01-01T23:59:59.000Z

392

Dissipation in a Quantum Wire: Fact and Fantasy  

Science Conference Proceedings (OSTI)

Where, and how, does energy dissipation of electrical energy take place in a ballistic wire? Fully two decades after the advent of the transmissive phenomenology of electrical conductance, this deceptively simple query remains unanswered. We revisit the quantum kinetic basis of dissipation and show its power to give a definitive answer to our query. Dissipation leaves a clear, quantitative trace in the non-equilibrium current noise of a quantum point contact; this signature has already been observed in the laboratory. We then highlight the current state of accepted understandings in the light of well-known yet seemingly contradictory measurements. The physics of mesoscopic transport rests not in coherent carrier transmission through a perfect and dissipationless metallic channel, but explicitly in their dissipative inelastic scattering at the wire's interfaces and adjacent macroscopic leads.

Das, Mukunda P. [Department of Theoretical Physics, IAS, Australian National University, Canberra, ACT 0200 (Australia); Green, Frederick [School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)

2008-10-23T23:59:59.000Z

393

Wrapping process for fabrication of A-15 superconducting composite wires  

DOE Patents (OSTI)

A method for fabricating superconducting wires wherein a billet of copper containing filaments of niobium or vanadium is rolled to form a strip which is wrapped about a tin-alloy core to form a composite. The alloy is a tin-copper alloy for niobium filaments and a gallium-copper alloy for vanadium filaments. The composite is then drawn down to a desired wire size and heat treated. During the heat treatment process, the tin in the bronze reacts with the niobium to form the superconductor niobium tin. In the case where vanadium is used, the gallium in the gallium bronze reacts with the vanadium to form the superconductor vanadium gallium. This new process eliminates the costly annealing steps, external tin plating and drilling of bronze ingots required in a number of prior art processes.

Suenaga, M.; Klamut, C.J.; Luhman, T.S.

1980-08-15T23:59:59.000Z

394

Toroidal constant-tension superconducting magnetic energy storage units  

DOE Patents (OSTI)

A superconducting magnetic energy storage unit is provided in which the magnet is wound in a toroidal fashion such that the magnetic field produced is contained only within the bore of the magnet, and thus producing a very low external field. The superconducting magnet includes a coolant channel disposed through the wire. The bore of the magnet comprises a storage volume in which cryogenic coolant is stored, and this volume supplies the coolant to be delivered to the coolant in the magnet.

Herring, J.S.

1990-10-26T23:59:59.000Z

395

Toroidal constant-tension superconducting magnetic energy storage units  

DOE Patents (OSTI)

A superconducting magnetic energy storage unit is provided in which the magnet is wound in a toroidal fashion such that the magnetic field produced is contained only within the bore of the magnet, and thus producing a very low external field. The superconducting magnet includes a coolant channel disposed through the wire. The bore of the magnet comprises a storage volume in which cryogenic coolant is stored, and this volume supplies the coolant to be delivered to the coolant channel in the magnet.

Herring, J. Stephen (Idaho Falls, ID)

1992-01-01T23:59:59.000Z

396

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Tenaslta Power Services Co. Tenaslta Power Services Co. OE Docket No. EA-243-A Order Authorizing Electricity Exports to Canada Order No. EA-243-A March 1,2007 Tenaska Power Services Co. Order No. EA-243-A I. BACKGROUND Exports of elcctricity from the United States to a foreign country are regulated by the Department of Energy (DOE) pursuant to sections 30 I(b) and 402(f) of the Departrncnt of' Energy Organizatio~l Act (42 U, S.C. 7 15 1 (b), 7 1 72Cf)) and rcquirc authorization under section 202(e) of the Federal Power Act (FPA) ( Z 6 U. s.c.824a(e)j1. On August 16,2001, DOE issued Order No. EA-243 authorizing Tenaska Power Scrvices Co. (Tenaska) to transmit electric cncrgy from the United States to Canada as a power marketer. That authority expired on August 16,2003. On August 14,2006, Teilaska applied to renew the electricity export authority

397

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TexMex Energy, LLC TexMex Energy, LLC OE Docket No. EA-294-A Order Authorizing Electricity Exports to Mexico Order No. EA-294-A February 22, 2007 TexMex Energy, LLC Order No. EA-294-A I. BACKGROUND Exports of electricity from the United States to a foreign count~y are regulated by the Department of Energy (DOE) pursuant to sections 301(b) and 402(f) of the Department of Energy Organization Act (42 U.S.C. 7 15 1 (b), 71 72(f)) and require authorization under section 202(e) of the Federal Power Act (FPA) (16 U.S.C.824a(e)) . On August 25,2004, DOE issued Order No. EA-294 authorizing TexMex Energy LLC (TexMex) to transmit electric energy fiom the United States to Mexico as a power marketer. That authority expired on August 25, 2006. On September 8, 2006, TexMex applied to renew the electricity export authority

398

United States  

Gasoline and Diesel Fuel Update (EIA)

United States United States Coal ................................................ 4,367 4,077 4,747 4,181 4,473 4,125 4,983 4,330 4,414 4,003 4,796 4,178 4,344 4,479 4,348 Natural Gas .................................... 2,802 2,843 3,694 2,863 2,713 2,880 3,636 2,707 2,792 2,972 3,815 2,849 3,052 2,986 3,109 Petroleum (a) .................................. 74 73 81 67 73 70 75 66 75 70 76 66 74 71 71 Other Gases ................................... 32 33 36 32 32 34 37 33 33 35 39 34 33 34 35 Nuclear ........................................... 2,176 2,044 2,257 2,170 2,106 2,037 2,167 2,010 2,144 2,074 2,206 2,055 2,162 2,080 2,120 Renewable Energy Sources: Conventional Hydropower ........... 736 886 716 633 765 887 708 646 767 919 729 659 742 751 768 Wind ............................................ 491 520 353 449 477 521 379 475

399

Specification for Smart Inverter Interactions with the Electric Grid Using International Electrotechnical Commission 61850  

Science Conference Proceedings (OSTI)

This document contains a specification for communication with smart inverters. The communications enable a range of common functions for photovoltaic and storage systems. This specification is the work product of an industry collaborative activity that was managed by the Electric Power Research Institute (EPRI) in coordination with the Department of Energy, Sandia National Laboratories, and the Solar Electric Power Association. The activity was managed as an open process, ultimately engaging more than 35...

2010-10-13T23:59:59.000Z

400

Plant Support Engineering: Guidance for Replacing Inverters and Battery Chargers at Nuclear Power Plants  

Science Conference Proceedings (OSTI)

Utilities are continuing to pursue license renewal applications and power uprates, and these initiatives are being undertaken on an aging fleet of nuclear plants. Many plants must replace inverters and battery chargers to support these initiatives. However, industry expertise to support such activities has diminished since the days of plant constructionthere are fewer qualified vendors and equipment manufacturers, materials have changed in many cases, and licensees are typically not currently staffed for...

2008-10-29T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Policy Strategies and Paths to promote Sustainable Energy Systems- The dynamic Invert Simulation Tool  

SciTech Connect

The European Union has established a number of targetsregarding energy efficiency, Renewable Energy Sources (RES) and CO2reductions as the 'GREEN PAPER on Energy Efficiency', the Directive for'promotion of the use of bio-fuels or other renewable fuels fortransport' or 'Directive of the European Parliament of the Council on thepromotion of cogeneration based on a useful heat demand in the internalenergy market'. A lot of the according RES and RUE measures are notattractive for investors from an economic point of view. Thereforegovernmentsall over the world have to spend public money to promotethese technologies/measures to bring them into market. These expenditureshave to be adjusted to budget concerns and should be spent mostefficiently. Therefore, the spent money has to be dedicated totechnologies and efficiency measures with the best yield in CO2 reductionwithout wasting money. The core question: "How can public money - forpromoting sustainable energy systems - be spent most efficiently toreduce GHG-emissions?" has been well investigated by the European projectInvert. In course of this project a simulation tool has been designed toanswer this core question. This paper describes the modelling with theInvert simulation tool and shows the key features necessary forsimulating the energy system. A definition of 'Promotion SchemeEfficiency' is given which allows estimating the most cost effectivetechnologies and/or efficiency measures to reduce CO2 emissions.Investigations performed with the Invert simulation tool deliver anoptimum portfolio mix of technologies and efficiency measures for eachselected region. Within Invert seven European regions were simulated andfor the Austrian case study the detailed portfolio mix is shown andpolitical conclusions are derived.

Stadler, Michael; Kranzl, Lukas; Huber, Claus; Haas, Reinhard; Tsioliaridou, Elena

2006-05-01T23:59:59.000Z

402

Near net shape processing of continuous lengths of superconducting wire  

DOE Patents (OSTI)

A system and method for mechanically forming a ceramic superconductor product. A system for making the ceramic superconductor includes a metallic channel portion having a cross section for receiving a ceramic superconductor powder, a roll to mechanically reduce the channel cross section and included superconductor powder and a cap portion welded to the channel portion using a localized high energy source. The assembled bar is then mechanically reduced to form a tape or wire end product.

Danyluk, Steven (Atlanta, GA); McNallan, Michael (Oak Park, IL); Troendly, Robert (St. Charles, IL); Poeppel, Roger (Glen Ellyn, IL); Goretta, Kenneth (Downer Grove, IL); Lanagan, Michael (Woodridge, IL)

1997-01-01T23:59:59.000Z

403

Modification of the spontaneous emission of CdTe nanocrystals in TiO 2 inverted opals  

Science Conference Proceedings (OSTI)

A light source in a three-dimensional photonic crystal has been realized by depositing CdTenanocrystals on the inner surface of TiO 2 inverted opalfilms. Two effects

V. G. Solovyev; S. G. Romanov; C. M. Sotomayor Torres; M. Müller; R. Zentel; N. Gaponik; A. Eychmüller; A. L. Rogach

2003-01-01T23:59:59.000Z

404

Discrete sliding-mode control of a PWM inverter for sinusoidal output waveform synthesis with optimal sliding curve  

SciTech Connect

This paper presents a discrete sliding-mode control scheme with feedforward compensation for the closed-loop regulation of the pulse-width modulated (PWM) inverter used in an uninterruptible power supply (UPS). The proposed feedforward controller can effectively improve the tracking performance of the PWM inverter. In designing the sliding-mode controller, the authors have taken load disturbance into consideration to enhance the robustness of the PWM inverter. Moreover, the upper bound of the load disturbance under which the sliding condition can be maintained has also been derived. The sliding curve of the sliding-mode controller is designed such that the behavior of the controlled PWM inverter is optimal subject to the selected cost function. Due to the coordinate transformation proposed in this paper, only the output voltage needs to be measured as feedback for the purpose of closed-loop regulation. Simulation and experimental results are given to show the effectiveness of the proposed control scheme.

Jung, S.L.; Tzou, Y.Y. [National Chiao Tung Univ., Hsinchu (Taiwan, Province of China). Dept. of Control Engineering

1996-07-01T23:59:59.000Z

405

A 55 kW Three-Phase Inverter With Si IGBT s and SiC Schottky Diodes  

SciTech Connect

Silicon carbide (SiC) power devices are expected to have an impact on power converter efficiency, weight, volume, and reliability. Currently, only SiC Schottky diodes are commercially available at relatively low current ratings. Oak Ridge National Laboratory has collaborated with Cree and Semikron to build a Si insulated-gate bipolar transistor-SiC Schottky diode hybrid 55-kW inverter by replacing the Si p-n diodes in Semikron's automotive inverter with Cree's made-to-order higher current SiC Schottky diodes. This paper presents the developed models of these diodes for circuit simulators, shows inverter test results, and compares the results with those of a similar all-Si inverter.

Ozpineci, Burak [ORNL; Chinthavali, Madhu Sudhan [ORNL; Tolbert, Leon M [ORNL; Kashyap, Avinash S [ORNL; Mantooth, Homer A [ORNL

2006-01-01T23:59:59.000Z

406

An Acoustic Telemetry System Implemented for Real-Time Monitoring of the Gulf Stream with Inverted Echo Sounders  

Science Conference Proceedings (OSTI)

From August 1989 until August 1990, a simple acoustic telemetry system was used for obtaining real-time data from four inverted echo sounders (IESs) deployed in the Synoptic Ocean Prediction Experiment (SYNOP) inlet array in the Gulf Stream east ...

Stephan D. Howden; D. Randolph Watts; Karen L. Tracey; H. Thomas Rossby

1994-04-01T23:59:59.000Z

407

A 55-kW Three-Phase Inverter with Si IGBTs and SiC Schottky Diodes  

SciTech Connect

Silicon carbide (SiC) power devices are expected to have an impact on power converter efficiency, weight, volume, and reliability. Currently, only SiC Schottky diodes are commercially available at relatively low current ratings. Oak Ridge National Laboratory has collaborated with Cree and Semikron to build a Si insulated-gate bipolar transistor-SiC Schottky diode hybrid 55-kW inverter by replacing the Si p-n diodes in Semikron's automotive inverter with Cree's made-to-order higher current SiC Schottky diodes. This paper presents the developed models of these diodes for circuit simulators, shows inverter test results, and compares the results with those of a similar all-Si inverter.

Tolbert, Leon M [ORNL; Ozpineci, Burak [ORNL; Chinthavali, Madhu Sudhan [ORNL; Mantooth, Homer A [ORNL; Kashyap, Avinash S [ORNL

2009-01-01T23:59:59.000Z

408

Precipitation Regimes during Cold-Season Central U.S. Inverted Trough Cases. Part I: Synoptic Climatology and Composite Study  

Science Conference Proceedings (OSTI)

This paper is the first of two papers that examines the organization of the precipitation field in central U.S. cold-season cyclones involving inverted troughs. The first portion of the study examines the varying precipitation distribution that ...

Robert A. Weisman; Keith G. McGregor; David R. Novak; Jason L. Selzler; Michael L. Spinar; Blaine C. Thomas; Philip N. Schumacher

2002-12-01T23:59:59.000Z

409

Advanced Photovoltaic Inverter Functionality using 500 kW Power Hardware-in-Loop Complete System Laboratory Testing: Preprint  

Science Conference Proceedings (OSTI)

With the increasing penetration of distribution connected photovoltaic (PV) systems, more and more PV developers and utilities are interested in easing future PV interconnection concerns by mitigating some of the impacts of PV integration using advanced PV inverter controls and functions. This paper describes the testing of a 500 kW PV inverter using Power Hardware-in-Loop (PHIL) testing techniques. The test setup is described and the results from testing the inverter in advanced functionality modes, not commonly used in currently interconnected PV systems, are presented. PV inverter operation under PHIL evaluation that emulated both the DC PV array connection and the AC distribution level grid connection are shown for constant power factor (PF) and constant reactive power (VAr) control modes. The evaluation of these modes was completed under varying degrees of modeled PV variability.

Mather, B. A.; Kromer, M. A.; Casey, L.

2013-01-01T23:59:59.000Z

410

Homogenous BSCCO-2212 Round Wires for Very High Field Magnets  

Science Conference Proceedings (OSTI)

The performance demands on modern particle accelerators generate a relentless push towards higher field magnets. In turn, advanced high field magnet development places increased demands on superconducting materials. Nb3Sn conductors have been used to achieve 16 T in a prototype dipole magnet and are thought to have the capability for {approx}18 T for accelerator magnets (primarily dipoles but also higher order multipole magnets). However there have been suggestions and proposals for such magnets higher than 20 T. The High Energy Physics Community (HEP) has identified important new physics opportunities that are enabled by extremely high field magnets: 20 to 50 T solenoids for muon cooling in a muon collider (impact: understanding of neutrinos and dark matter); and 20+ T dipoles and quadrupoles for high energy hadron colliders (impact: discovery reach far beyond present). This proposal addresses the latest SBIR solicitation that calls for grant applications that seek to develop new or improved superconducting wire technologies for magnets that operate at a minimum of 12 Tesla (T) field, with increases up to 15 to 20 T sought in the near future (three to five years). The long-term development of accelerator magnets with fields greater than 20 T will require superconducting wires having significantly better high-field properties than those possessed by current Nb{sub 3}Sn or other A15 based wires. Given the existing materials science base for Bi-2212 wire processing, we believe that Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} (Bi-2212) round wires can be produced in km-long piece lengths with properties suitable to meet both the near term and long term needs of the HEP community. The key advance will be the translation of this materials science base into a robust, high-yield wire technology. While the processing and application of A15 materials have advanced to a much higher level than those of the copper oxide-based, high T{sub c} (HTS) counterparts, the HTS materials have the very significant advantage of an extremely high H{sub c2}. For this reason, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} (Bi-2212, or 2212) in the form of a multifilamentary Ag alloy matrix composite is beginning to attract the interest of the magnet community for future extremely high-field magnets or magnet-insert coils for 4.2K operation. Fig. 1 shows an example of excellent JE (engineering current density) in Bi-2212 round wire at fields up to 45 T, demonstrating the potential for high field applications of this material. For comparison, the Nb{sub 3}Sn wires used in magnets in the 16-18 T range typically perform with J{sub E} in the range 200-500 A/mm{sup 2}; the Bi-2212 wire retains this level of performance to fields at least as high as 45 T, and probably significantly higher. Bi-2212 conductors have in fact been used to generate a 25 T field in a superconducting insert magnet. These two factors- the very high field critical current performance of Bi-2212, and the already demonstrated capability of this material for high field magnets up to 25 T, strongly suggest this material as a leading contender for the next generation high field superconducting (HFS) wire. This potential was recognized by the US Academy of Science's Committee on Opportunities in High Magnetic Field Science. Their report of the same name specifically calls out the high field potential for this material, and suggests that 30 T magnets appear feasible based on the performance of 2212. There are several requirements for HFS conductors. The most obvious is J{sub E} (B, T), the engineering current density at the field and temperature of operation. As shown in Fig. 1, Bi-2212 excels in this regard. Stability requirements for magnets dictate that the effective filament diameter should be less than 30 micrometers, something that Bi-2212 multifilamentary wire can uniquely satisfy among the HFS superconducting wire technologies. Additional requirements include mechanical properties that prevent stress limitation of J{sub E} at the operating conditions, resistive transition index (n-value) suffic

Dr. Scott Campbell Dr. Terry Holesinger Dr. Ybing Huang

2012-06-30T23:59:59.000Z

411

Polarimetry and Schlieren diagnostics of underwater exploding wires  

SciTech Connect

Nondisturbing laser-probing polarimetry (based on the Faraday and Kerr effects) and Schlieren diagnostics were used in the investigation of underwater electrical wire explosion. Measuring the polarization plane rotation angle of a probing laser beam due to the Faraday effect allows one to determine an axially resolved current flowing through the exploding wire, unlike commonly used current probes. This optical method of measuring current yields results that match those obtained using a current viewing resistor within an accuracy of 10%. The same optical setup allows simultaneous space-resolved measurement of the electric field using the Kerr effect. It was shown that the maximal amplitude of the electric field in the vicinity of the high-voltage electrode is approx80 kV/cm and that the radial electric field is <1 MV/cm during the wire explosion. Finally, it was shown that the use of Schlieren diagnostics allows one to obtain qualitatively the density distribution behind the shock wave front, which is important for the determination of the energy transfer from the discharge channel to the generated water flow.

Fedotov-Gefen, A. V.; Krasik, Ya. E. [Physics Department, Technion, 32000 Haifa (Israel)

2009-11-01T23:59:59.000Z

412

Development of a low-cost, light-weight, efficient, 1. 5 kW inverter. Final report  

SciTech Connect

The effective use of low-voltage dc power sources, such as fuel cells and batteries, requires efficient power conversion equipment to provide ac voltages. The development of a silent, light-weight inverter is discussed in this paper. The inverter is capable of delivering 1.5 kW into a 0.8-1.0 power factor load at 120 or 240 Vac and at 60 or 400 Hz. (GRA)

Suelzle, L.R.; Suelzle, J.S.

1975-09-01T23:59:59.000Z

413

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bangor Hydro-Electric Company Bangor Hydro-Electric Company OE Docket No. PP-89-1 Amendment to Presidential Permit Order No. PP-89-1 December 30,2005 PRESIDENTIAL PERMIT AMENDMENT Bangor Hydro-Electric Company Order No. PP-89-1 I. BACKGROUND The Department of Energy (DOE) has responsibility for implementing Executive Order (E.O.) 10485, as amended by E.O. 12038, which requires the issuance of a Presidential permit by DOE before electric trans~nission facilities may be constructed, operated, maintained, or connected at the borders of the United States. DOE may issue such a permit if it determines that the permit is in the public interest and after obtaining favorable recommendations from the U.S. Departments of State and Defense. On December 16, 1988, Bangor Hydro-Electric Company (BHE) applied to DOE

414

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

7 7 United States Department of Energy Southeastern Power Administration Wholesale Power Rate Schedule CTV-1-H Availability: This rate schedule shall be available to the Tennessee Valley Authority (hereinafter called TVA). Applicability: This rate schedule shall be applicable to electric capacity and energy generated at the Dale Hollow, Center Hill, Wolf Creek, Old Hickory, Cheatham, Barkley, J. Percy Priest, and Cordell Hull Projects (all of such projects being hereafter called collectively the "Cumberland Projects") and the Laurel Project sold under agreement between the Department of Energy and TVA. Character of Service: The electric capacity and energy supplied hereunder will be three-phase alternating current at a frequency of approximately 60 hertz at the outgoing terminals of the Cumberland

415

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

United States Department of Energy Southeastern Power Administration Wholesale Power Rate Schedule CTVI-1-A Availability: This rate schedule shall be available to customers (hereinafter called the Customer) who are or were formerly in the Tennessee Valley Authority (hereinafter called TVA) service area. Applicability: This rate schedule shall be applicable to electric capacity and energy generated at the Dale Hollow, Center Hill, Wolf Creek, Old Hickory, Cheatham, Barkley, J. Percy Priest, and Cordell Hull Projects (all of such projects being hereafter called collectively the "Cumberland Projects") and the Laurel Project sold under agreement between the Department of Energy and the Customer. Character of Service: The electric capacity and energy supplied hereunder will be three-phase alternating

416

UNITED STATES  

Office of Legacy Management (LM)

f).~<~~ \--\c :y-,ai F p"- KG f).~<~~ \--\c :y-,ai F p"- KG WASHINOTDN 28.0. C. ' -lr ' \ ' ' --- ".I ?--" ' z I. .~;-4.' J frr*o& 2 ii, - - -4 70-147 LRL:JCD JAN !! 8 1958 Oregon Metallurgical Corporation P. 0. Box 484 Albany, Oregon Attention: Mr. Stephen M. Shelton General Manager Gentlemen: Enclosed is Special Nuclear Material License No. SNM-144, as amended. Very 33uly yours, r:; I,;, ll)~gQ""d".- Lyall Johnson Chief, Licensing Branch Division of Licensing & Regulation Enclosure: SNM-144, as amended Distribution: bRO0 Attn: Dr. H.M.Roth DFMusser NMM MMMann INS JCRyan FIN (2) HSteele LRL SRGustavson LRL Document room Formal file Suppl. file Br & Div rf's ' .b liwwArry s/VW- ' q+ ' yj/ 2; 2-' , COP' 1 J JAM01958 -- UNITED STATES ATOMIC ENERGY COMMISSION

417

United States  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

United States Department of Energy Southeastern Power Administration Wholesale Power Rate Schedule JW-2-F Availability: This rate schedule shall be available to the Florida Power Corporation (or Progress Energy Florida, hereinafter called the Company). Applicability: This rate schedule shall be applicable to electric energy generated at the Jim Woodruff Project (hereinafter called the Project) and sold to the Company in wholesale quantities. Points of Delivery: Power sold to the Company by the Government will be delivered at the connection of the Company's transmission system with the Project bus. Character of Service: Electric power delivered to the Company will be three-phase alternating current at a nominal frequency of 60 cycles per second.

418

PV Inverter Products Manufacturing and Design Improvements for Cost Reduction and Performance Enhancements: Final Subcontract Report, November 2003 (Revised)  

SciTech Connect

The specific objectives of this subcontracted development work by Xantrex Technology Inc. were to: (1) Capture the newest digital signal processor (DSP) technology to create high-impact,''next generation'' power conversion equipment for the PV industry; (2) Create a common resource base for three PV product lines. This standardized approach to both hardware and software control platforms will provide significant market advantage over foreign competition; (3) Achieve cost reductions through increased volume of common components, reduced assembly labor, and the higher efficiency of producing more products with fewer design, manufacturing, and production test variations; (4) Increase PV inverter product reliability. Reduce inverter size, weight and conversion losses. The contract goals were to achieve an overall cost reduction of 10% to 20% for the three inverters and with no compromise in performance. The cost of the 10-kW inverter was reduced by 56%, and the cost of the 25-kW inverter was reduced by 53%. The 2.5-kW inverter has no basis for comparison, but should benefit equally from this design approach. Not only were the contract cost reduction goals exceeded by a wide margin, but the performance and reliability of the products were also enhanced. The conversion efficiency improvement, as reflected in the 50% conversion loss reduction, adds significant value in renewable energy applications. The size and weight reductions also add value by providing less cumbersome product solutions for system designers.

West, R.

2004-04-01T23:59:59.000Z

419

Low-Cost Superconducting Wire for Wind Generators: High Performance, Low Cost Superconducting Wires and Coils for High Power Wind Generators  

SciTech Connect

REACT Project: The University of Houston will develop a low-cost, high-current superconducting wire that could be used in high-power wind generators. Superconducting wire currently transports 600 times more electric current than a similarly sized copper wire, but is significantly more expensive. The University of Houston’s innovation is based on engineering nanoscale defects in the superconducting film. This could quadruple the current relative to today’s superconducting wires, supporting the same amount of current using 25% of the material. This would make wind generators lighter, more powerful and more efficient. The design could result in a several-fold reduction in wire costs and enable their commercial viability of high-power wind generators for use in offshore applications.

None

2012-01-01T23:59:59.000Z

420

Evaluation of battery converters based on 4. 8-MW fuel cell demonstrator inverter. Final report. [Contains brief glossary  

DOE Green Energy (OSTI)

Electrical power conditioning is a critical element in the development of advanced electrochemical energy storage systems. This program evaluates the use of existing self-commutated converter technology (as developed by the Power Systems Division of United Technologies for the 4.8-MW Fuel Cell Demonstrator) with modification for use in battery energy storage systems. The program consists of three parts: evaluation of the cost and performance of a self-commutated converter modified to maintain production commonality between battery and fuel cell power conditioners, demonstration of the principal characteristics required for the battery application in MW-scale hardware, and investigation of the technical requirements of operation isolated from the utility system. A power-conditioning system consisting of a self-commutated converter augmented with a phase-controlled rectifier was selected and a preliminary design, prepared. A principal factor in this selection was production commonality with the fuel cell inverter system. Additional types of augmentation, and the use of a self-commutated converter system without augmentation, were also considered. A survey of advanced battery manufacturers was used to establish the dc interface characteristics. The principal characteristics of self-commutated converter operation required for battery application were demonstrated with the aid of an available 0.5-MW development system. A survey of five REA and municipal utilities and three A and E firms was conducted to determine technical requirements for operation in a mode isolated from the utility. Definitive requirements for this application were not established because of the limited scope of this study. 63 figures, 37 tables.

Not Available

1980-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Parallel-wire grid assembly with method and apparatus for construction thereof  

DOE Patents (OSTI)

Disclosed is a parallel wire grid and an apparatus and method for making the same. The grid consists of a generally coplanar array of parallel spaced-apart wires secured between metallic frame members by an electrically conductive epoxy. The method consists of continuously winding a wire about a novel winding apparatus comprising a plurality of spaced-apart generally parallel spindles. Each spindle is threaded with a number of predeterminedly spaced-apart grooves which receive and accurately position the wire at predetermined positions along the spindle. Overlying frame members coated with electrically conductive epoxy are then placed on either side of the wire array and are drawn together. After the epoxy hardens, portions of the wire array lying outside the frame members are trimmed away.

Lewandowski, E.F.; Vrabec, J.

1981-10-26T23:59:59.000Z

422

Parallel-wire grid assembly with method and apparatus for construction thereof  

DOE Patents (OSTI)

Disclosed is a parallel wire grid and an apparatus and method for making the same. The grid consists of a generally coplanar array of parallel spaced-apart wires secured between metallic frame members by an electrically conductive epoxy. The method consists of continuously winding a wire about a novel winding apparatus comprising a plurality of spaced-apart generally parallel spindles. Each spindle is threaded with a number of predeterminedly spaced-apart grooves which receive and accurately position the wire at predetermined positions along the spindle. Overlying frame members coated with electrically conductive epoxy are then placed on either side of the wire array and are drawn together. After the epoxy hardens, portions of the wire array lying outside the frame members are trimmed away.

Lewandowski, Edward F. (Westmont, IL); Vrabec, John (South Holland, IL)

1984-01-01T23:59:59.000Z

423

Radial electric field 3D modeling for wire arrays driving dynamic hohlraums on Z.  

SciTech Connect

The anode-cathode structure of the Z-machine wire array results in a higher negative radial electric field (Er) on the wires near the cathode relative to the anode. The magnitude of this field has been shown to anti-correlate with the axial radiation top/bottom symmetry in the DH (Dynamic Hohlraum). Using 3D modeling, the structure of this field is revealed for different wire-array configurations and for progressive mechanical alterations, providing insight for minimizing the negative Er on the wire array in the anode-to-cathode region of the DH. Also, the 3D model is compared to Sasorov's approximation, which describes Er at the surface of the wire in terms of wire-array parameters.

Mock, Raymond Cecil

2007-06-01T23:59:59.000Z

424

Mound bridge-wire welding, testing and corrosion seminar, Miamisburg, OH, May 7-8, 1968  

SciTech Connect

Brief summaries are presented on the following presentations: welding for low voltage operation, welding techniques at Mound, welding/joining at Sandia, Ultrasonic`s plastic assemblies of detonator components, laser welding bridge-wires, laser safety in the Biorad industrial environment, nondestructive testing at Mound, thermal cycle data and evaluation, thermal cycle nondestructive testing, corrosion of detonator electrode and bridge-wire, and corrosion studies and fabrication of bridge-wire at Sigmund Cohn.

Richards, M.A.

1968-08-07T23:59:59.000Z

425

Investigating the Use of Ultrasonic Guided Waves for Aging Wire Insulation Assessment  

E-Print Network (OSTI)

Aging wiring has become a critical issue to DoD, NASA, FAA, and Industry. The problem is that insulation on environmentally aged wire becomes brittle and cracks. This exposes the underlying conductive wire to the potential for short circuits and fire. The difficulty is that techniques to monitor aging wire problems focus on applying electrical sensing techniques that are not very sensitive to the wire insulation. Thus, the development of methods to quantify and monitor aging wire insulation is highly warranted. Measurement of wire insulation stiffness by ultrasonic guided waves is being examined. Initial laboratory tests were performed on a simple model consisting of a solid cylinder and then a solid cylinder with a polymer coating. Experimental measurements showed that the lowest order axisymmetric mode may be sensitive to stiffness changes in the wire insulation. To test this theory, mil-spec wire samples MIL-W-81381, MIL-W-22759/34, and MIL-W-22759/87 (typically found in aircraft) were heat-damaged in an oven, in a range of heating conditions. The samples were 12, 16, and 20 gauge and the heat-damage introduced material changes in the wire-insulation that made the originally flexible insulation brittle and darker in color. Axisymmetric mode phasevelocity increased for the samples that were exposed to heat for longer duration. For example, the phase velocity in the 20-gauge MIL-W-22759/34 wire changed from a baseline value of 2790m/s to 3280m/s and 3530m/s for one-hour exposures to 349 C and 399 C, respectively. Although the heat-damage conditions are not the same as environmental aging, we believe that with further development and refinements, the ultrasonic guided waves can be used to inspect wire-insulation for detrimental environmental aging conditions.

Robert F. Anastasi; Eric I. Madaras

2002-01-01T23:59:59.000Z

426

SpaceWire model development technology for satellite architecture.  

DOE Green Energy (OSTI)

Packet switched data communications networks that use distributed processing architectures have the potential to simplify the design and development of new, increasingly more sophisticated satellite payloads. In addition, the use of reconfigurable logic may reduce the amount of redundant hardware required in space-based applications without sacrificing reliability. These concepts were studied using software modeling and simulation, and the results are presented in this report. Models of the commercially available, packet switched data interconnect SpaceWire protocol were developed and used to create network simulations of data networks containing reconfigurable logic with traffic flows for timing system distribution.

Eldridge, John M.; Leemaster, Jacob Edward; Van Leeuwen, Brian P.

2011-09-01T23:59:59.000Z

427

Test Report on ISR Double-Loop, Spray-Cooled Inverter  

SciTech Connect

The Isothermal Systems Research, Inc. (ISR) double-loop, two-phase spray cooling system was designed to use 85 C transmission oil to cool a heat exchanger via a second cooling loop. The heat exchanger condenses the working fluid vapor back to liquid inside a sealed enclosure to allow for continuous spray cooling of electronics. In the ORNL tests, 85 C water/ethylene/glycol (WEG), which has better thermal properties than transmission oil, was substituted for the transmission oil. Because the ISR spray-cooling system requires a second cooling loop, the final inverter might be inherently larger than inverters that do not require a second-loop cooling system. The ISR test setup did not include a dc bus capacitor. Because the insulated gate bipolar transistor (IGBT) conduction test indicated that the ISR test setup could not be properly loaded thermally, no switching tests were conducted. Therefore it was not necessary to attach external capacitors outside the test setup. During load situations not exceeding 400A, the WEG inlet temperature was higher than the WEG outlet temperature. This meant that the 85 C WEG heat exchanger was not cooling the inverter and became a thermal load to the inverter. Only when the load was higher than 400A with a higher coolant temperature and the release valve actuated did the WEG heat exchanger start to cool the 2-phase coolant. The inverter relied strongly on the cooling of the huge aluminum enclosure located inside the ventilation chamber. In a hybrid vehicle, the inverter is situated under the hood, where the dependency on cooling provided by the enclosure may become a problem. The IGBT power dissipation with both sides being spray cooled was around 34 W/cm{sup 2} at 403A, with 995W total IGBT loss at 113.5 C projected junction temperature before the release valve was actuated. The current loading could rise higher than 403 A before reaching the 125 C junction temperature limit if the pressure buildup inside the enclosure could be prevented by improving the secondary cooling loop. This 34 w/cm{sup 2} was an average across all dies. There is no doubt that the cooling capability of the ISR spray-cooling test setup can be improved by (1) lowering the WEG inlet temperature from 85 C to say 70 C, this would condense the vapor better and lower the container pressure, (2) modification of the vapor condenser inside the container to cool both the vapor and the liquid of the 2-phase coolant, in the present setup only the vapor is cooled by the condenser inside the container, and (3) lower the liquid temperature through (1) and (2) to avoid the vaporization that causes cavitations in the pump for ensuring the pump's life expectance.

Hsu, John S [ORNL; Coomer, Chester [ORNL; Campbell, Steven L [ORNL; Wiles, Randy H [ORNL; Lowe, Kirk T [ORNL; McFee, Marshall T [ORNL

2007-02-01T23:59:59.000Z

428

Enhancing Performance of /MOD-YBCO/RABiTSTM-based 2G Wire  

Science Conference Proceedings (OSTI)

AMSC's approach to enhance the wire performance is twofold: 1) Increasing the self-field critical current; 2) Enhancing the flux pinning performance. AMSC's ...

429

Wire-shaped semiconductor light-emitting diodes for general-purpose lighting  

SciTech Connect

The object of this work is to develop and optimize a new type of light-emitting diode (LED) with a wire-shaped, cylindrical geometry.

Mauk, Michael G.

2002-10-28T23:59:59.000Z

430

Corrosion Products of Iron Wire Arterial Implants from In Vivo and In ...  

Science Conference Proceedings (OSTI)

In the present study, iron wire was implanted into either the abdominal rat aortic wall or ... Fabrication of a Cellulosic Nanocomposite Scaffold with Improved ...

431

Synthesis of Superconducting MgB2 Wire, Tapes and Films - Energy ...  

Electricity Transmission Synthesis of Superconducting MgB2 Wire, Tapes and Films Ames Laboratory. Contact AMES About This Technology Technology Marketing ...

432

Production of a Low-Cost DMD Wire Feedstock by Direct ...  

Science Conference Proceedings (OSTI)

Presentation Title, Production of a Low-Cost DMD Wire Feedstock by Direct Consolidation of Ti Sponge. Author(s), Kevin F. Dring, Martin Lefstad, Ola Jensrud.

433

Feature based cost and carbon emission modelling for wire and arc additive manufacturing.  

E-Print Network (OSTI)

??The wire and arc additive manufacturing (WAAM) is a CNC and welding deposition based additive manufacturing method. This novel manufacturing technique has potential cost and… (more)

Guo, Jianing

2012-01-01T23:59:59.000Z

434

Polarization dependence of the absorption coefficient for an array of strained quantum wires  

Science Conference Proceedings (OSTI)

The polarization dependence of the absorption coefficient for compressively and tensilely strained quantum wires is investigated as a function of strain

Igor Vurgaftman; Jasprit Singh

1995-01-01T23:59:59.000Z

435

Indentation response of polymer films and aircraft wiring with polymer insulation.  

E-Print Network (OSTI)

??M.S. The airline regulatory communities are interested in methods that can access degradation in the polymer insulation of aging aircraft wiring. This study investigates the… (more)

Nagendran, Kaushik Bindiganavile, 1979-

2005-01-01T23:59:59.000Z

436

Note: Frequency-conversion photonic Doppler velocimetry with an inverted circulator  

Science Conference Proceedings (OSTI)

Photonic Doppler velocimetry (PDV) is a fiber-based interferometer used in dynamic compression research. Conventional PDV systems are simple to construct but do not perform well in all measurement conditions, while universal PDV systems that support many different configurations are complex and expensive. A simpler approach is the use of external, inverted circulators which can be added and removed in a modular fashion. This technique permits frequency-conversion measurements with a conventional PDV system. Using a correction to remove baseline effects, frequency conversion systems can resolve low velocity transients that conventional PDV cannot.

Dolan, D. H.; Ao, T. [Sandia National Laboratories, Albuquerque, New Mexico 87185-1195 (United States); Hernandez, O. [Electrical and Computer Engineering, University of Texas at El Paso, Texas 79968 (United States)

2012-02-15T23:59:59.000Z

437

Dynamic performance of a STATCON at an HVDC inverter feeding a very weak AC system  

SciTech Connect

This paper investigates the dynamic performance of the advanced static var compensator or STATCON at a high voltage direct current (HVDC) converter terminal where the ac system has a very low short circuit ratio (SCR). The STATCON is based on a nine-level GTO thyristor inverter. The studies include operating characteristics of the STATCON under various ac and dc disturbances. The simulation results are compared with other types of reactive power compensation options available for such applications. It is shown that the STATCON has clear advantages over the other compensators, in areas such as; fault response time, voltage support ability, and dc recovery, while operating with very weak ac systems.

Zhuang, Y.; Menzies, R.W. [Univ. of Manitoba, Winnipeg, Manitoba (Canada); Nayak, O.B. [HVDC Research Centre, Winnipeg, Manitoba (Canada); Turanli, H.M. [Manitoba Hydro, Winnipeg, Manitoba (Canada)

1996-04-01T23:59:59.000Z

438

Modeling of Inverter Control with Distribution Management System for Distributed Energy Resources  

Science Conference Proceedings (OSTI)

A distribution energy resource management system (DERMS) has been added as an external control to the OpenDSS software. This report discusses that control and provides case studies illustrating the feeder response. The visual interpretation of the feeder in the external control is similar to that of an operator’s control interface.The DERMS uses meters on a feeder to provide power flow data. This data is processed and used to update the control of the inverter-based generation. The ...

2013-12-20T23:59:59.000Z

439

Measured performances of curved inverted-vee, absorber compound parabolic concentrating solar-energy collectors  

SciTech Connect

The design and thermal performance of modified compound parabolic concentrating (CPC) solar-energy collectors are described. The designs incorporate a curved inverted-Vee absorber fin, which allows a reflector of simple geometry to be used. This CPC collector, has exhibited a superior performance to that of a conventional cusp-reflector CPC design, owing to the enhancement of the optical efficiency obtained by eliminating gap optical losses and an enhanced heat removal factor. The consequence upon the performance of a further design refinement, which inhibited the convective heat losses, is also reported.

Norton, B. (Univ. of Ulster at Jordanstown (Ireland)); Prapas, D.E. (Aristotle Univ. of Thessaloniki (Greece)); Eames, P.C.; Probert, S.D. (Cranfield Institute of Technology, Bedford (England))

1989-01-01T23:59:59.000Z

440

A Novel Inductor-less DC-AC Cascaded H-bridge Multilevel Boost Inverter for Electric/Hybrid Electric Vehicle Applications  

SciTech Connect

This paper presents an inductorless cascaded H- bridge multilevel boost inverter for EV and HEV applications. Currently available power inverter systems for HEVs use a DC- DC boost converter to boost the battery voltage for a traditional 3-phase inverter. The present HEV traction drive inverters have low power density, are expensive, and have low efficiency because they need a bulky inductor. An inductorless cascaded H-bridge multilevel boost inverter for EV and HEV applications is proposed in this paper. Traditionally, each H-bridge needs a DC power supply. The proposed inductorless cascaded H-bridge multilevel boost inverter uses a standard 3-leg inverter (one leg for each phase) and an H-bridge in series with each inverter leg which uses a capacitor as the DC power source. Fundamental switching scheme is used to do modulation control and to produce a 5-level phase voltage. Experiments show that the proposed inductorless DC-AC cascaded H-bridge multilevel boost inverter can output a boosted AC voltage.

Du, Zhong [ORNL; Ozpineci, Burak [ORNL; Tolbert, Leon M [ORNL; Chiasson, John N [ORNL

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Results from integrated tests of a 50MW /SUB t/ MHD channel and inverter at the CDIF  

SciTech Connect

An important series of tests have been completed at the Component Development and Integration Facility (CDIF); MHD generated DC power was transmitted as three-phase AC power to the commercial power grid, via a line-commutated inverter. Test results presented show the inverter to be a useful tool for characterization of MHD channel electrical output as a function of various plasma and load conditions, during both transient and steady-state operations. Coupled MHD channel-to-inverter operation was achieved and sufficient data were gathered to verify inverter operation in three modes: voltage, current, and impedance. An overall DC to AC power transfer relationship was established and an evaluation of inverter output characteristics including voltage, current, and power factor, were obtained. Load characteristics for maximum MHD channel power output and sensitivity of the MHD channel performance to a wide range of external load settings were determined. During the test series, 2.7 MWh of three-phase AC power was transmitted to the commercial power grid.

Farrar, L.C.; Ferraro, R.J.; Koester, J.K.; Ray, E.R.

1983-08-01T23:59:59.000Z

442

PV water pumping with a peak-power tracker using a simple six-step square-wave inverter  

SciTech Connect

The application of photovoltaics (PVs) has been increasingly popular, especially in remote areas, where power from a utility is not available or is too costly to install. PV-powered water pumping is frequently used for agriculture and in households. Among many available schemes, the system under study consists of a PV array, a variable-frequency inverter, an induction motor, and a water pump. The inverter feeds the induction motor, which drives the water pump. To seek the optimum power output of the PV array, the inverter is operated at variable frequency, to vary the output of the water pump. The inverter is operated to generate a six-step quasi-square wave, instead of a pulsewidth modulated (PWM) voltage output, to reduce the switching losses. The inverter acts as both a variable-frequency source and a peak-power tracker of the system, thus, having the number of switches minimized. The system is a low-cost design, with a simple control strategy. The dc bus is supported by a dc capacitor; thus, a balance-of-power flow must be maintained to avoid the collapse of the dc-bus voltage. Another advantage of the system is that the current is limited to an upper limit of the PV-array current. Thus, in case a short circuit is developed, the motor winding and the power semiconductor switches can be protected against excessive current flow.

Muljadi, E. [National Renewable Energy Lab., Golden, CO (United States)

1997-05-01T23:59:59.000Z

443

Conjugated "Molecular Wire" for Excitons  

NLE Websites -- All DOE Office Websites (Extended Search)

Conjugated "Molecular Wire" for Excitons Conjugated "Molecular Wire" for Excitons Yuki Shibano, Hiroshi Imahori, Paiboon Sreearunothai, Andrew R. Cook and John R. Miller J. Phys. Chem. Lett. 1, 1492-1496 (2010). [Find paper at ACS Publications] Abstract: We have synthesized new conjugated, rigid rod oligomers of fluorene, Fn(C60)2, n = 4, 8, 12, and 16. These pure compounds have Fn chains up to 140 Ã… long. The C60 groups covalently attached at both ends serve as traps for excitons created in the Fn chains. Excitons created in the chains by photoexcitation reacted rapidly with the C60 groups with decays described well by the sum of two exponentials. Mean reaction times were 2.3, 5.5, and 10.4 ps for n = 8, 12, and 16. In F16(C60)2, the 10.4 ps reaction time was 40 times faster than that found in earlier reports on

444

Wire-chamber radiation detector with discharge control  

DOE Patents (OSTI)

A wire chamber; radiation detector has spaced apart parallel electrodes and grids defining an ignition region in which charged particles or other ionizing radiations initiate brief localized avalanche discharges and defining an adjacent memory region in which sustained glow discharges are initiated by the primary discharges. Conductors of the grids at each side of the memory section extend in orthogonal directions enabling readout of the X-Y coordinates of locations at which charged particles were detected by sequentially transmitting pulses to the conductors of one grid while detecting transmissions of the pulses to the orthogonal conductors of the other grid through glow discharges. One of the grids bounding the memory region is defined by an array of conductive elements each of which is connected to the associated readout conductor through a separate resistance. The wire chamber avoids ambiguities and imprecisions in the readout of coordinates when large numbers of simultaneous or; near simultaneous charged particles have been detected. Down time between detection periods and the generation of radio frequency noise are also reduced.

Perez-Mendez, V.; Mulera, T.A.

1982-03-29T23:59:59.000Z

445

Wire Scanner Beam Profile Measurements for the LANSCE Facility  

SciTech Connect

The Los Alamos Neutron Science Center (LANSCE) is replacing beam profile measurement systems, commonly known as Wire Scanners (WS). Using the principal of secondary electron emission, the WS measurement system moves a wire or fiber across an impinging particle beam, sampling a projected transverse-beam distribution. Because existing WS actuators and electronic components are either no longer manufactured or home-built with antiquated parts, a new WS beam profile measurement is being designed, fabricated, and tested. The goals for these new WS's include using off-the-shelf components while eliminating antiquated components, providing quick operation while allowing for easy maintainability, and tolerating external radioactivation. The WS measurement system consists of beam line actuators, a cable plant, an electronics processor chassis, and software located both in the electronics chassis (National Instruments LabVIEW) and in the Central Control Room (EPICS-based client software). This WS measurement system will measure Hand H{sup +} LANSCE-facility beams and will also measure less common beams. This paper describes these WS measurement systems.

Gilpatrick, John D. [Los Alamos National Laboratory; Gruchalla, Michael E. [Los Alamos National Laboratory; Martinez, Derwin [Los Alamos National Laboratory; Pillai, Chandra [Los Alamos National Laboratory; Rodriguez Esparza, Sergio [Los Alamos National Laboratory; Sedillo, James Daniel [Los Alamos National Laboratory; Smith, Brian G. [Los Alamos National Laboratory

2012-05-15T23:59:59.000Z

446

D0-EC RTD Wiring Layout (North Calorimeter)  

SciTech Connect

The temperature of the North End-Calorimeter of the D-Zero detector is to be monitored by several RTD temperature sensors. The location and other important information pertaining to each individual RTD is included in the following tables, which are grouped by bundle number. There are mne 60 pIll port connectors. Each connector corresponds to a bundle of twisted pairs. Twisted pairs, of one of eight colors along with either a black or white wire, run to 10-pin connectors which have a mate on the module or cryostat wall. In general, all 60 pins, or all 10 pins are not used. The color scheme of the wires was designed so that all the twisted pairs with white run West from the instrumentation port, and twisted pairs with black run East. This scheme proved to be very successful and efficient during the installation process. After being installed, every RTD connection was checked and their corresponding resistances were recorded by Jerry Blazey. All the RTD's tested successfully, except for 2. The 2 dead RTD's were: Channel 17 on bundle 4, which is located on the front of MH module 8L; and Channel 13 on bundle 5, which is located on the Bottom of the Middle Coarse Plate of the IH.

Primdahl, K.; /Fermilab

1991-06-04T23:59:59.000Z

447

D0-EC RTD Wiring Layout (South Calorimter)  

SciTech Connect

The temperature of the South End-Calorimeter of the D-Zero detector is to be monitored by several RTD temperature sensors. The location and other important information pertaining to each individual RTD is included in the following tables, which are grouped by bundle number. There are nine 60 pin port connectors. Each connector corresponds to a bundle of twisted pairs. Twisted pairs, of one of eight colors along with either a black or white wire, run to 10-pin connectors which have a mate on the module or cryostat wall. In general, all 60 pins, or all 10 pins are not used. The color scheme of the wires was deSigned so that all the twisted pairs with white run West from the instrumentation port, and twisted pairs with black run East. This scheme proved to be very successful and efficient during the installation process. After being installed, every RTD connection was checked and their corresponding resistances were recorded by Jerry Blazey. All the ATD's tested successfully, except for 4. The 4 dead RTD's were: Channel 12 on bundle 1, which is located on the back of OH module 7R; Channel 19 on bundle 4, which is located on the back of MH module 5L; Channel 9 on bundle 5, which is located on the IH fine 2-inch strap; and Channel 25 on bundle 7, which is located on the east strongback.

Leibfritz, J.R.; /Fermilab

1991-08-06T23:59:59.000Z

448

Precision correlation of Kansas Pennsylvanian cyclothems emphasizing wire-line logs and conodonts in a sequence stratigraphic framework  

SciTech Connect

The lithologic components and genetic interpretation of classic Pennsylvanian cyclothems have clear counterparts in sequence stratigraphy. Blocky mudstones (paleosols) and associated extensive subaerial exposure surfaces bound individual cyclothems and represent type-1 sequence boundaries. The 'middle limestones' represent flooding units that may be thin or absent, depending on the relative rate of marine inundation. Most 'core shales' correspond to condensed sections accumulated during maximum flooding and are persistent from the basin to the upper shelf. Dense well-control with occasional cores provides a means to apply sequence-stratigraphic analysis to thin cyclothemic strata, which are below the resolution of conventional seismic profiles. A lithostratigraphic framework can be established by correlating the 'core shales' using their distinctive gamma-ray log signature. Rapid conodont evolution has resulted in a characteristic fauna for most of these 'core shales,' thus providing biostratigraphic confirmation of the lithostratigraphic correlations. The wide spread nature of these maximum transgressive deposits extends the utility of the conodont indicators across dissimilar biofacies and lithofacies that would otherwise be difficult to correlate. Integration of wire-line log and conodont indicators across dissimilar biofacies and lithofacies that would otherwise be difficult to correlate. Integration of wire-line log and conodont data by core and outcrop study could lay the groundwork for biostratigraphic analysis of 'core shale' cuttings obtained during drilling.

Lambert, L.L.; Heckel, P.H. (Univ. of Iowa, Iowa City (United States)); Watney, W.L.; Stevenson, G.M. (Kansas Geological Survey, Lawrence (United States)); Barrick, J.E.; Boardman, D.R. II (Texas Tech Univ., Lubbock (United States))

1991-03-01T23:59:59.000Z

449

Control of Two Permanent Magnet Machines Using a Five-Leg Inverter for Automotive Applications  

SciTech Connect

This paper presents digital control schemes for control of two permanent magnet (PM) machines in an integrated traction and air-conditioning compressor drive system for automotive applications. The integrated drive system employs a five-leg inverter to power a three-phase traction PM motor and a two-phase compressor PM motor by tying the common terminal of the two-phase motor to the neutral point of the three-phase motor. Compared to a three-phase or a standalone two-phase inverter, it eliminates one phase leg and shares the control electronics between the two drives, thus significantly reducing the component count of the compressor drive. To demonstrate that the speed and torque of the two PM motors can be controlled independently, a control strategy was implemented in a digital signal processor, which includes a rotor flux field orientation based control (RFOC) for the three-phase motor, a similar RFOC and a position sensorless control in the brushless dc (BLDC) mode for the two-phase motor. Control implementation issues unique to a two-phase PM motor are also discussed. Test results with the three-phase motor running in the ac synchronous (ACS) mode while the two-phase motor either in the ACS or the BLDC mode are included to verify the independent speed and torque control capability of the integrated drive.

Su, Gui-Jia [ORNL; Tang, Lixin [ORNL; Huang, Xianghui [GE Global Research

2006-01-01T23:59:59.000Z

450

Individual differences in preferred steering effort for steer-by-wire systems  

Science Conference Proceedings (OSTI)

Steer-by-wire systems provide drivers with the opportunity to personalize steering settings in vehicles. Studies conducted in the past have indicated that preferences for steering effort, one of the factors which affect steering feel, vary based on individual ... Keywords: human machine interface, steer-by-wire, steering effort, steering feel, steering systems

Swethan Anand; Jacques Terken; Jeroen Hogema

2011-11-01T23:59:59.000Z

451

Parallel automated wire-routing with a number of competing processors  

Science Conference Proceedings (OSTI)

The purpose of the automated wire routing for VLSI and printed circuit board design is to connect a number of terminal pairs distributed throughout wiring plane with net paths which do not intersect each other. Although maze running and line search are ...

Yoshizo Takahashi; Shigetaka Sasaki

1990-06-01T23:59:59.000Z

452

Time and Frequency Response of a Resistance-Wire Aircraft Atmospheric Temperature Sensor  

Science Conference Proceedings (OSTI)

The heat transfer characteristics of an aircraft-mounted resistance-wire atmospheric temperature sensor are modeled to determine the time and frequency responses. The sensor element (Rosemount 102E4AL) consists of a 25-?m-diameter platinum wire ...

G. A. Payne; C. A. Friehe; D. K. Edwards

1994-04-01T23:59:59.000Z

453

Microstructure development in Nb3Sn(Ti) internal tin superconducting wire  

E-Print Network (OSTI)

in the inner and outer rings of the 26-bundle wire (left) and in the 85-bundle wire (right). The voids observed to identify the phases present and X-ray microtomography (XMT) to investigate the void volume and distribution tin [1], powder-in-tube (PIT) [2] and bronze processes [3]. In this study, two commercially produced

Elliott, James

454

Forcing neurocontrollers to exploit sensory symmetry through hard-wired modularity in the game of Cellz  

E-Print Network (OSTI)

Forcing neurocontrollers to exploit sensory symmetry through hard-wired modularity in the game the benefits of different types of modularity by hard-wiring these into evolvable systems. In this paper we to the phenomenon that the interconnection of unrelated parts of a neural network in itself can hamper evolution

Lucas, Simon M.

455

Research on Magnetic Signal Extracting and Filtering of Coal Mine Wire Rope Belt Conveyer Defects  

Science Conference Proceedings (OSTI)

Because of wire rope conveyer belt with high load operating and complex conditions of coal mine, it is prone to cause conveyer belt horizontal rupture. It will bring tremendous hazards for coal mine safe production. Defects of wire rope and joints displacement ...

Qinghua Mao; Hongwei Ma; Xuhui Zhang; Dawei Zhang

2011-01-01T23:59:59.000Z

456

Modeling of wire-on-tube heat exchangers using finite element method  

Science Conference Proceedings (OSTI)

Wire-on-tube heat exchangers are analysed under normal operating conditions (free convection) using finite element method. Galerkin's weighted residual method is used to minimise the errors. The effects of ambient temperatures and mass flow rates of ... Keywords: finite element method, free convection, phase change, wire on-tube heat exchangers

G. A. Quadir; G. M. Krishnan; K. N. Seetharamu

2002-03-01T23:59:59.000Z

457

Laboratory Calibration of a Vibrating Wire Device for Measuring Concentrations of Supercooled Liquid Water  

Science Conference Proceedings (OSTI)

Laboratory measurements of supercooled liquid water are made by a vibrating-wire sensor whose frequency of vibration varies according to the mass of ice collected on it. The vibrating-wire system is designed to be placed in the humidity duct of ...

Geoffrey E. Hill

1989-12-01T23:59:59.000Z

458

Low power interconnect design for fpgas with bidirectional wiring using nanocrystal floating gate devices (abstract only)  

Science Conference Proceedings (OSTI)

New architectures for the switch box and connection block are proposed for use in an energy efficient field programmable gate array (FPGA) with bidirectional wiring. Power-hungry SRAMs are replaced by non-volatile nanocrystal floating gate (NCFG) devices ... Keywords: bidirectional wiring, connection block, floating gate, fpga, high speed, low power, nanocrystal, switch box

Daniel Schinke; Wallace Shep Pitts; Neil Di Spigna; Paul Franzon

2011-02-01T23:59:59.000Z

459

Critical-Current Reduction in Thin Superconducting Wires Due to Current Crowding  

SciTech Connect

We demonstrate experimentally that the critical current in superconducting NbTiN wires is dependent on their geometrical shape, due to current-crowding effects. Geometric patterns such as 90{degrees} corners and sudden expansions of wire width are shown to result in the reduction of critical currents. The results are relevant for single-photon detectors as well as parametric amplifiers.

Hortensius, H.L.; Driessen, E.F.C.; Klapwijk, T.M.; Berggren, K.K.; Clem, John

2012-05-03T23:59:59.000Z

460

Categorical Exclusion Determination Form Proposed Action Title: (0473-1597) Smart Wire Grid, Inc. -  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

97) Smart Wire Grid, Inc. - 97) Smart Wire Grid, Inc. - Distributed Power Flow Contro l Using Smart Wires for Energy Routing Program or Field Office: Advanced Research Projects Agency - Energy Location(s) (City/County/State): California, Missouri, North Carolina, Georgia, Wash ington, Pennsylvania, and Tennessee Proposed Action Description: Funding will support development of a Smart Wire System Controller and an energy router software to enable distributed agents to coordinate with the control center, improve power flow control, and take advantage of unused capacity within the existing transmission system. In addition, the power controller will enable grid operators to optimize transmission assets to fully integrate variable renewable energy sources. Proposed work consists of (1) designing, developing, testing, and optimizing the Smart Wire System Controller to meet utility specifications; (2)

Note: This page contains sample records for the topic "unit inverter wiring" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Microsoft Word - Final Private Wires Study 1-12-09clean .doc  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Study of the Effect of Private Wire Laws on Development of Combined Heat and Power Facilities Study of the Effect of Private Wire Laws on Development of Combined Heat and Power Facilities STUDY OF THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT AND POWER FACILITIES Pursuant to Section 1308 of The Energy Independence and Security Act of 2007 Prepared for: U.S. Department of Energy Navigant Consulting, Inc. Suite 500 1801 K Street, NW Washington, DC 20006 202.481.7534 www.navigantconsulting.com January 12, 2009 Study of the Effect of Private Wire Laws on Development of Combined Heat and Power Facilities Page i STATUTORY REQUIREMENT Energy Independence and Security Act of 2007 SEC. 1308. STUDY OF THE EFFECT OF PRIVATE WIRE LAWS ON THE DEVELOPMENT OF COMBINED HEAT AND POWER FACILITIES.

462

Microsoft Word - Final Private Wires Report 10-19-09.doc  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Study of the Effect of Private Wire Laws on Development of Combined Heat and Power Facilities Study of the Effect of Private Wire Laws on Development of Combined Heat and Power Facilities THE EFFECT OF PRIVATE WIRE LAWS ON DEVELOPMENT OF COMBINED HEAT AND POWER FACILITIES Pursuant to Section 1308 of The Energy Independence and Security Act of 2007 January 12, 2009 Report of Study of the Effect of Private Wire Laws on Development of Combined Heat and Power Facilities Page 1 Section 1308 of the Energy Independence and Security Act of 2007 ("EISA 2007") directed the Secretary of Energy, in consultation with the States, to undertake a study of the laws affecting the siting of privately-owned distribution wires on or across public rights of way and to consider the impact of those laws on the development of combined heat and power ("CHP") facilities, as well as to determine

463

Wiring methods, components, and equipment for general use. - 1926.405  

NLE Websites -- All DOE Office Websites (Extended Search)

Wiring methods, components, and equipment for general use. - 1926.405 Wiring methods, components, and equipment for general use. - 1926.405 www.OSHA.gov A-Z Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Regulations (Standards - 29 CFR) Wiring methods, components, and equipment for general use. - 1926.405 Regulations (Standards - 29 CFR) - Table of Contents * Part Number: 1926 * Part Title: Safety and Health Regulations for Construction * Subpart: K * Subpart Title: Electrical * Standard Number: 1926.405 * Title: Wiring methods, components, and equipment for general use. 1926.405(a) Wiring methods. The provisions of this paragraph do not apply to conductors which form an integral part of equipment such as motors, controllers, motor control centers and like equipment. 1926.405(a)(1) General requirements -

464

A Catalyst Wire-feed Arc Discharge for Synthesis of Carbon Nanotubes and  

NLE Websites -- All DOE Office Websites (Extended Search)

A Catalyst Wire-feed Arc Discharge for Synthesis of Carbon Nanotubes and A Catalyst Wire-feed Arc Discharge for Synthesis of Carbon Nanotubes and Graphene Particles This invention pertains to a highly effective arc-based synthesis of single wall carbon nanotubes and graphene particles using catalysts in the form of wires made from ion group alloys instead of commonly used catalyst powders. The catalyst wire can be introduced into the discharge either from the anode or cathode regions or into the inter-electrode gap. The catalyst introduction can be done automatically and controlled using feedback based on the ablation of the graphite electrode. To maintain simplicity and attractiveness for industrial applications, it is desirable that the catalyst composition be contained in a single wire alloy. No.: M-808 Inventor(s): Yevgeny Raitses

465

Comprehensive analysis of radiative properties of brass and Al arranged in nested cylindrical wire arrays.  

SciTech Connect

Experimental results of nested cylindrical wire arrays (NCWA) consisting of brass (70% Cu and 30% Zn) wires on one array and Al (5056, 5% Mg) wires on the other array performed on the UNR Zebra generator at 1.0 MA current are compared and analyzed. Specifically, radiative properties of K-shell Al and Mg ions and L-shell Cu and Zn ions are compared as functions of the placements of the brass and Al wires on the inner and outer arrays. A full diagnostic set which included more than ten different beam-lines was implemented. Identical loads were fielded to allow the timing of time-gated pinhole and x-ray spectrometers to be shifted to get a more complete understanding of the evolution of plasma parameters over the x-ray pulse. The importance of the study of NCWAs with different wire materials is discussed.

Stafford, A. (University of Nevada, Reno, NV); Keim, S. F. (University of Nevada, Reno, NV); Osborne, Glenn C. (University of Nevada, Reno, NV); Esaulov, Andrey A. (University of Nevada, Reno, NV); Shrestha, I. (University of Nevada, Reno, NV); Kantsyrev, Victor Leonidovich (University of Nevada, Reno, NV); Shlyaptseva, V. (University of Nevada, Reno, NV); Coverdale, Christine Anne; Williamson, K. M. (University of Nevada, Reno, NV); Ouart, Nicholas D. (University of Nevada, Reno, NV); Safronova, Alla S. (University of Nevada, Reno, NV); Weller, M. E. (University of Nevada, Reno, NV)

2010-11-01T23:59:59.000Z

466

Effects of the roughness characteristics on the wire tool surface for the electrical discharge machining properties  

Science Conference Proceedings (OSTI)

Wire electrical discharge machining (WEDM) has been investigated to obtain the better discharge machining properties of the removal rate and the surface roughness in a few decades. Recently, it revealed that the rough tool electrodes can improve the WEDM properties for some sort of materials. In this study, the rough wire electrodes using a wet blasting method was developed and evaluated the machining performance for the insulated Si{sub 3}N{sub 4} in the WEDM processes. As the results, it could not recognize the advantage of roughness wire electrode under the high-energy condition, but it found that the electro-conductive layer thickness became thinner in comparison with those of normal wires. On the contrary, it could be obtained the better surface roughness in the low energy condition. It was supposed that the roughed wire surface generates the homogeneous dispersion discharges on the workpiece.

Fukuzawa, Yasushi; Yamashita, Masahide; Mamuro, Hiroaki; Yamashita, Ken [Nagaoka University of Technology, Department of Mechanical Engineering, 1603-1 Kamitomioka-machi, Nagaoka, Niigata, 940-2188 (Japan); Ogata, Masayoshi [Macoho Co., Ltd. 525 Kanawa, Isurugi-machi, Nagaoka, Niigata 940-2032 JAPAN (Japan)

2011-01-17T23:59:59.000Z

467

Microsoft Word - CX-Fairview-Rogue_GroundWire_WEB.doc  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

, 2010 , 2010 REPLY TO ATTN OF: KEP-Alvey SUBJECT: Environmental Clearance Memorandum Harold Grappe Project Manager - TELP-TTP-3 Proposed Action: Replacement of overhead ground wire in the last and most southerly mile of the Fairview-Rogue #1 230-kV transmission line leading into the Rogue Substation PP&A Project No.: 1736 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.3 Routine maintenance activities...for structures, rights-of-way, infrastructures such as roads, equipment...routine maintenance activities, corrective...are required to maintain... infrastructures...in a condition suitable for a facility to be used for its designed purpose. Location: The project is located in Curry County, Oregon, in the Alvey District. The project

468

Method for producing strain tolerant multifilamentary oxide superconducting wire  

DOE Patents (OSTI)

A strain tolerant multifilamentary wire capable of carrying superconducting currents is provided comprising a plurality of discontinuous filaments formed from a high temperature superconducting material. The discontinuous filaments have a length at least several orders of magnitude greater than the filament diameter and are sufficiently strong while in an amorphous state to withstand compaction. A normal metal is interposed between and binds the discontinuous filaments to form a normal metal matrix capable of withstanding heat treatment for converting the filaments to a superconducting state. The geometry of the filaments within the normal metal matrix provides substantial filament-to-filament overlap, and the normal metal is sufficiently thin to allow supercurrent transfer between the overlapped discontinuous filaments but is also sufficiently thick to provide strain relief to the filaments.

Finnemore, Douglas K. (Ames, IA); Miller, Theodore A. (Tucson, AZ); Ostenson, Jerome E. (Ames, IA); Schwartzkopf, Louis A. (Mankato, MN); Sanders, Steven C. (Ames, IA)

1994-07-19T23:59:59.000Z

469

Magnetic Alignment of Pulsed Solenoids Using the Pulsed Wire Method  

SciTech Connect

A unique application of the pulsed-wire measurement method has been implemented for alignment of 2.5 T pulsed solenoid magnets. The magnetic axis measurement has been shown to have a resolution of better than 25 {micro}m. The accuracy of the technique allows for the identification of inherent field errors due to, for example, the winding layer transitions and the current leads. The alignment system is developed for the induction accelerator NDCX-II under construction at LBNL, an upgraded Neutralized Drift Compression experiment for research on warm dense matter and heavy ion fusion. Precise alignment is essential for NDCX-II, since the ion beam has a large energy spread associated with the rapid pulse compression such that misalignments lead to corkscrew deformation of the beam and reduced intensity at focus. The ability to align the magnetic axis of the pulsed solenoids to within 100 pm of the induction cell axis has been demonstrated.

Arbelaez, D.; Madur, A.; Lipton, T.M.; Waldron, W.L.; Kwan, J.W.

2011-04-01T23:59:59.000Z

470

Seebeck Measurements on Arrays of Embedded Bi Submicron Wires  

E-Print Network (OSTI)

The transport properties of nanoscaled objects can be very different from those of the corresponding bulk material due to the influence of finite-size and quantum-size effects in low-dimensional structures. In 1993, Hicks and Dresselhaus published theoretical investigations on transport properties of one-dimensional conductors, predicting a significantly enhanced thermoelectric efficiency [1]. Because of large effective masses and mean free path of the conduction electrons, Bi is an ideal material for studying the transport properties of nanowires. The electrical conductivity of Bi nanowires was already intensively investigated [2]. Here, a simple method for the measurement of another thermoelectric material property, the Seebeck coefficient S, of arrays of embedded submicron wires is presented. S is defined as proportionality factor between the potential

S. Müller; T. W. Cornelius; D. Huzel; O. Picht; M. Rauber; R. Neumann

2008-01-01T23:59:59.000Z

471

Interaction between graphene and metamaterials: split rings vs. wire pairs  

Science Conference Proceedings (OSTI)

We have recently shown that graphene is unsuitable to replace metals in the current-carrying elements of metamaterials. At the other hand, experiments have demonstrated that a layer of graphene can modify the optical response of a metal-based metamaterial. Here we study this electromagnetic interaction between metamaterials and graphene. We show that the weak optical response of graphene can be modified dramatically by coupling to the strong resonant fields in metallic structures. A crucial element determining the interaction strength is the orientation of the resonant fields. If the resonant electric field is predominantly parallel to the graphene sheet (e.g., in a complementary split-ring metamaterial), the metamaterial’s resonance can be strongly damped. If the resonant field is predominantly perpendicular to the graphene sheet (e.g., in a wire-pair metamaterial), no significant interaction exists.

Zou, Yanhong; Tassin, Philippe; Koschny, Thomas; Soukoulis, Costas

2012-05-14T23:59:59.000Z

472

Nomination Form DEPARTMENT / UNIT  

E-Print Network (OSTI)

Nomination Form DEPARTMENT / UNIT: CAMPUS ADDRESS: CLASSIFICATION / TITLE: DEPARTMENT EMAIL ADDRESS: DEPARTMENT TELEPHONE: 2011 FRANKLIN STAFF SERVICE AWARDS START DATE IN DEPARTMENT / UNIT: ACTUAL NUMBER MEMBER DEADLINE: FRIDAY MARCH 4, 2011 ADDITIONAL COMMENTS: Signature of Head / Director of Nominee's Unit

Arnold, Jonathan

473

Unit Outline Training Guide  

E-Print Network (OSTI)

Unit Outline Builder Training Guide Document Status: Final Revision Number: 6.0 Revision Date: 14 Approved #12;Online Unit Outline Builder Training Guide Curtin University of Technology Page 2 TABLE................................................................................................................. 4 4. Log in and Select a Unit Outline

474

Nomination Form DEPARTMENT / UNIT  

E-Print Network (OSTI)

Nomination Form DEPARTMENT / UNIT: CAMPUS ADDRESS: CLASSIFICATION / TITLE: DEPARTMENT EMAIL ADDRESS: DEPARTMENT TELEPHONE: 2013 FRANKLIN STAFF SERVICE AWARDS START DATE IN DEPARTMENT / UNIT: ACTUAL NUMBER MEMBER DEADLINE: MARCH 5, 2013 ADDITIONAL COMMENTS: Signature of Head / Director of Nominee's Unit

Arnold, Jonathan

475

Nomination Form DEPARTMENT / UNIT  

E-Print Network (OSTI)

Nomination Form DEPARTMENT / UNIT: CAMPUS ADDRESS: CLASSIFICATION / TITLE: DEPARTMENT EMAIL ADDRESS: DEPARTMENT TELEPHONE: 2012 FRANKLIN STAFF SERVICE AWARDS START DATE IN DEPARTMENT / UNIT: ACTUAL NUMBER MEMBER DEADLINE: FRIDAY MARCH 2, 2012 ADDITIONAL COMMENTS: Signature of Head / Director of Nominee's Unit

Arnold, Jonathan

476

Nomination Form DEPARTMENT / UNIT  

E-Print Network (OSTI)

Nomination Form DEPARTMENT / UNIT: CAMPUS ADDRESS: CLASSIFICATION / TITLE: DEPARTMENT EMAIL ADDRESS: DEPARTMENT TELEPHONE: 2014 FRANKLIN STAFF SERVICE AWARDS START DATE IN DEPARTMENT / UNIT: ACTUAL NUMBER MEMBER DEADLINE: MARCH 7, 2014 ADDITIONAL COMMENTS: Signature of Head / Director of Nominee's Unit

Arnold, Jonathan

477

Inverter Eligibility Listing Procedure for Solar Electric Incentive Programs Updated 8/24/11 Senate Bill 1 (SB1) defines the solar incentive programs for California, and inverters must be listed on  

E-Print Network (OSTI)

/24/11 Senate Bill 1 (SB1) defines the solar incentive programs for California, and inverters must be listed two staterun programs, the California Solar Initiative and the New Solar Homes Partnership, as well as solar incentive programs administered by publicly owned utilities. The California Solar Initiative

478

Inverted organic solar cells comprising a solution-processed cesium fluoride interlayer  

SciTech Connect

We investigate the influence of solution-processed cesium fluoride (CsF) interlayers on the performance of inverted polymer solar cells comprising a blend of poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C{sub 61}-butyric acid methyl ester. The thickness of the CsF layer is optimized in terms of current-voltage characteristics by a variation of the solid content in solution. Capacitance-voltage characteristics reveal a shift of the built-in voltage at the cathode interface by about 0.3 V as compared to devices without a CsF layer, giving rise to an increase in open-circuit voltage by the same value. The vertical distribution of Cs{sup +} and F{sup +} ions is studied by secondary ion mass spectroscopy, indicating a strong diffusion of the alkaline fluoride into the organic layer stack.

Reinhard, Manuel; Zhang Zhenhao; Colsmann, Alexander; Lemmer, Uli [Light Technology Institute, Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, 76131 Karlsruhe (Germany); Hanisch, Jonas; Ahlswede, Erik [Zentrum fuer Sonnenenergie- und Wasserstoff-Forschung Baden-Wuerttemberg, Industriestrasse 6, 70565 Stuttgart (Germany)

2011-01-31T23:59:59.000Z

479

Application of GTO voltage source inverter in a hybrid HVDC link  

SciTech Connect

This paper investigates the application of a GTO voltage source inverter in a two-terminal HVdc link, which is fed at the sending end by a line-commutated rectifier. This type of HVdc link may be applied when power transfer is predominantly unidirectional, especially to a weak ac system. The investigations are based on analytical studies and digital time-domain simulations with the Electro-Magnetic Transient program for DC systems (EMTDC). Control method and protection requirements are studied, together with dynamic behavior of the system following disturbances, e.g. dc fault, ac fault, start-up etc. The studies are aimed at exhibiting the technical feasibility of the proposed HVdc scheme. Need for further studies is pointed out when necessary.

Zhao, Z.; Iravani, M.R. (Univ. of Toronto, Ontario (Canada). Dept. of Electrical Engineering)

1994-01-01T23:59:59.000Z

480

Utility-Side Voltage and PQ Control with Inverter-based Photovoltaic Systems  

SciTech Connect

Distributed energy resources (DER) are small generators located close to the load centers. The DERs that are integrated to the grid with the power electronic converter interfaces are capable of providing nonactive power in addition to active power. Hence, they are capable of regulating the voltages of the weak buses in the distribution systems. This paper discusses the voltage control capability of photovoltaic (PV) systems as compared to the traditional capacitor banks. The simulation results prove the effectiveness of dynamic voltage control capability of inverter-based PV. With the proper control algorithm, the active and nonactive power from the DERs like battery banks or solar photovoltaic can be controlled independently. This paper also presents the scenario of controlling the active and nonactive power from the PV array to track and supply the local load.

Adhikari, Sarina [ORNL; Xu, Yan [ORNL; Li, Fangxing [ORNL; Li, Huijuan [ORNL; Kueck, John D [ORNL; Snyder, Isabelle B [ORNL; Barker, Thomas J. [Southern California Edison RTTC; Hite, Ronald [Southern California Edison RTTC

2011-01-01T23:59:59.000Z

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