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Note: This page contains sample records for the topic "wind turbines generate" 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.


1

Washington University Can the Sound Generated by Modern Wind Turbines  

E-Print Network [OSTI]

Washington University Can the Sound Generated by Modern Wind Turbines Affect the Health of Those turbines haveWind turbines have been getting biggerbeen getting bigger and bigger....and bigger.... Lars Needs Wind turbines are "green" and areWind turbines are "green" and are contributing to our energy

Salt, Alec N.

2

Low frequency noise from MW wind turbines --mechanisms of generation  

E-Print Network [OSTI]

Low frequency noise from MW wind turbines -- mechanisms of generation and its modeling Helge MW wind turbines -- mechanisms of generation and its modeling Department: Department of Wind Energy 3.6MW turbine 12 3.2 Noise as function of wind speed 12 3.3 Noise as function of rotor

3

Operation of a third generation wind turbine  

SciTech Connect (OSTI)

A modern wind turbine was installed on May 26, 1982, at the USDA Conservation and Production Research Laboratory, Bushland, Texas. This wind machine was used to provide electrical energy for irrigation pumping and other agricultural loads. The wind turbine purchased for this research is an Enertech Model 44, manufactured by Enertech Corporation, Norwich, Vermont. The horizontal-axis wind turbine has a 13.4 m diameter, three-bladed, fixed-pitch rotor on a 24.4-m tower. The blades are laminated epoxy-wood, and are attached to a steel hub. A 25-kW induction generator provides 240 V, 60 Hz, single-phase electrical power. The wind turbine operated 64 percent of the time, while being available to operate over 94 percent of the time. The unit had a net energy production of over 80,000 kWh in an average windspeed of 5.9 m/s at a height of 10 m in a 16-month period. The blade pitch was originally offset two degrees from design to maintain power production within the limitations of the gearbox, generator, and brakes. A maximum output of 23.2 kW averaged over a 15-second period indicated that with a new brake, the system was capable of handling more power. After a new brake was installed, the blade pitch was changed to one degree from design. The maximum power output measured after the pitch change was 29.3 kW. Modified blade tip brakes were installed on the wind turbine on July 7, 1983. These tip brakes increased power production at lower windspeeds while reducing power at higher windspeeds.

Vosper, F.C.; Clark, R.N.

1983-12-01T23:59:59.000Z

4

Energy 101: Wind Turbines  

ScienceCinema (OSTI)

See how wind turbines generate clean electricity from the power of the wind. Highlighted are the various parts and mechanisms of a modern wind turbine.

None

2013-05-29T23:59:59.000Z

5

Energy 101: Wind Turbines  

SciTech Connect (OSTI)

See how wind turbines generate clean electricity from the power of the wind. Highlighted are the various parts and mechanisms of a modern wind turbine.

None

2011-01-01T23:59:59.000Z

6

ERCOT's Dynamic Model of Wind Turbine Generators: Preprint  

SciTech Connect (OSTI)

By the end of 2003, the total installed wind farm capacity in the Electric Reliability Council of Texas (ERCOT) system was approximately 1 gigawatt (GW) and the total in the United States was about 5 GW. As the number of wind turbines installed throughout the United States increases, there is a greater need for dynamic wind turbine generator models that can properly model entire power systems for different types of analysis. This paper describes the ERCOT dynamic models and simulations of a simple network with different types of wind turbine models currently available.

Muljadi, E.; Butterfield, C. P.; Conto, J.; Donoho, K.

2005-08-01T23:59:59.000Z

7

Methods and apparatus for cooling wind turbine generators  

DOE Patents [OSTI]

A wind turbine generator includes a stator having a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis. A rotor is rotatable about the generator longitudinal axis, and the rotor includes a plurality of magnetic elements coupled to the rotor and cooperating with the stator windings. The magnetic elements are configured to generate a magnetic field and the stator windings are configured to interact with the magnetic field to generate a voltage in the stator windings. A heat pipe assembly thermally engaging one of the stator and the rotor to dissipate heat generated in the stator or rotor.

Salamah, Samir A. (Niskayuna, NY); Gadre, Aniruddha Dattatraya (Rexford, NY); Garg, Jivtesh (Schenectady, NY); Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Alplaus, NY); Carl, Jr., Ralph James (Clifton Park, NY)

2008-10-28T23:59:59.000Z

8

Wind turbine power generation emulation via doubly fed induction generator control .  

E-Print Network [OSTI]

??In this thesis, we emulate a Wind Turbine Generator by driving a Doubly Fed Induction Generator (DFIG) via a DC motor with variable input torque… (more)

Edwards, Gregory W.

2009-01-01T23:59:59.000Z

9

EEMD-based wind turbine bearing failure detection using the generator stator current homopolar component  

E-Print Network [OSTI]

EEMD-based wind turbine bearing failure detection using the generator stator current homopolar turbine generators for stationary and non stationary cases. Keyword: Wind turbine, induction generator on the installed equipment because they are hardly accessible or even inaccessible [1]. 1.1. Wind turbine failure

Boyer, Edmond

10

Doubly-fed induction generator torque in wind turbines  

Science Journals Connector (OSTI)

The field oriented doubly-fed induction generator (DFIG) is being increasingly used in variable speed wind turbines. It is therefore indispensable to become better acquainted with electrical and mechanical DFIG features in both stationary and dynamic ... Keywords: doubly-fed induction generator (DFIG), torque characteristic of DFIG

Jurica Smajo; Dinko Vukadinovic

2008-02-01T23:59:59.000Z

11

SHORT TERM PREDICTIONS FOR THE POWER OUTPUT OF ENSEMBLES OF WIND TURBINES AND PV-GENERATORS  

E-Print Network [OSTI]

SHORT TERM PREDICTIONS FOR THE POWER OUTPUT OF ENSEMBLES OF WIND TURBINES AND PV-GENERATORS Hans. For the conventional power park, the power production of the wind turbines presents a fluctuating 'negative load PRODUCTION OF WIND TURBINES For the forecast of the power production of wind turbines two approaches may

Heinemann, Detlev

12

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid  

E-Print Network [OSTI]

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid Fault Wind Turbines with Induction Generator during Grid Fault by Sigrid M. Bolik Institute of Energy turbine technology has undergone rapid developments. Growth in size and the optimization of wind turbines

Hansen, René Rydhof

13

DC Connected Hybrid Offshore-Wind and Tidal Turbine Generation System  

Science Journals Connector (OSTI)

“Hybrid Offshore-wind and Tidal Turbine” (HOTT) generation system (Rahman and ... interconnecting method for a DC side cluster of wind and tidal turbine generators system are proposed. This method can be achieved...

Mohammad Lutfur Rahman; Yasuyuki Shirai

2010-01-01T23:59:59.000Z

14

EA-1857: Wind Turbine Power Generation Complex at Idaho National Laboratory  

Broader source: Energy.gov [DOE]

This EA would evaluate the environmental impacts of the proposed wind turbine power generation complex at Idaho National Laboratory, Idaho.

15

A doubly-fed permanent magnet generator for wind turbines  

E-Print Network [OSTI]

Optimum extraction of energy from a wind turbine requires that turbine speed vary with wind speed. Existing solutions to produce constant-frequency electrical output under windspeed variations are undesirable due to ...

Thomas, Andrew J. (Andrew Joseph), 1981-

2004-01-01T23:59:59.000Z

16

Analysis of Temporal and Spatial Characteristics on Output of Wind Farms with Doubly Fed Induction Generator Wind Turbines  

Science Journals Connector (OSTI)

Due to the large number of wind turbines and covering too large area in a large wind farm, wake effects among wind turbines and wind speed time delays will have a greater impact of wind farms models. Taking wind farms with doubly fed induction generator(DFIG) ... Keywords: wind farm, modeling, temporal and spatial characteristics, DFIG, output characteristics

Shupo Bu; Xunwen Su

2012-12-01T23:59:59.000Z

17

Testing Small Wind Turbine Generators: Design of a Driving Dynamometer Stephen Rehmeyer Pepe  

E-Print Network [OSTI]

Testing Small Wind Turbine Generators: Design of a Driving Dynamometer by Stephen Rehmeyer Pepe Sc, Berkeley Spring 2007 #12;Testing Small Wind Turbine Generators: Design of a Driving Dynamometer Copyright c 2007 by Stephen Rehmeyer Pepe #12;Abstract Testing Small Wind Turbine Generators: Design of a Driving

Kammen, Daniel M.

18

Design of a wind turbine-generator system considering the conformability to wind velocity fluctuations  

SciTech Connect (OSTI)

The conformability of the rated power output of the wind turbine-generator system and of the wind turbine type to wind velocity fluctuations are investigated with a simulation model. The authors examine three types of wind turbines: the Darrieus-Savonius hybrid, the Darrieus proper and the Propeller. These systems are mainly operated at a constant tip speed ratio, which refers to a maximum power coefficient points. As a computed result of the net extracting power, the Darrieus turbine proper has little conformability to wind velocity fluctuations because of its output characteristics. As for the other turbines, large-scale systems do not always have an advantage over small-scale systems as the effect of its dynamic characteristics. Furthermore, it is confirmed that the net extracting power of the Propeller turbine, under wind direction fluctuation, is much reduced when compared with the hybrid wind turbine. Thus, the authors conclude that the appropriate rated power output of the system exists with relation to the wind turbine type for each wind condition.

Wakui, Tetsuya; Hashizume, Takumi; Outa, Eisuke

1999-07-01T23:59:59.000Z

19

Wind Turbines Condition Monitoring and Fault Diagnosis Using Generator Current Amplitude  

E-Print Network [OSTI]

Wind Turbines Condition Monitoring and Fault Diagnosis Using Generator Current Amplitude in the research of renewable energy sources. In order to make wind turbines as competitive as the classical detection in a Doubly-Fed Induction Generator (DFIG) based wind turbine for stationary and nonstationary

Paris-Sud XI, Université de

20

Wind Turbine Generator System Duration Test Report for the ARE 442 Wind Turbine  

SciTech Connect (OSTI)

This test is being conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, four turbines are being tested at the NWTC as a part of this project. Duration testing is one of up to 5 tests that may be performed on the turbines, including power performance, safety and function, noise, and power quality tests. The results of the testing provide manufacturers with reports that may be used for small wind turbine certification. The test equipment includes a grid connected ARE 442 wind turbine mounted on a 30.5 meter (100 ft) lattice tower manufactured by Abundant Renewable Energy. The system was installed by the NWTC Site Operations group with guidance and assistance from Abundant Renewable Energy.

van Dam, J.; Baker, D.; Jager, D.

2010-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Reference value choice of the wind turbine active power with doubly-fed induction generator  

Science Journals Connector (OSTI)

The variable speed wind turbine with doubly-fed induction generator (DFIG) is today widely used concept. This paper presents a control system of the DFIG wind turbine with focus on the control strategies and on active power reference value choice. The ... Keywords: DFIG, dynamic simulation, reference value of active power, wind turbine

J. Smajo; M. Smajo; D. Vukadinovic

2005-11-01T23:59:59.000Z

22

Wind Turbine Competition Introduction  

E-Print Network [OSTI]

Wind Turbine Competition Introduction: The Society of Hispanic Professional Engineers, SHPE at UTK, wishes to invite you to participate in our first `Wind Turbine' competition as part of Engineer's Week). You will be evaluated by how much power your wind turbine generates at the medium setting of our fan

Wang, Xiaorui "Ray"

23

Variable speed wind turbine generator with zero-sequence filter  

DOE Patents [OSTI]

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility. 14 figs.

Muljadi, E.

1998-08-25T23:59:59.000Z

24

Variable Speed Wind Turbine Generator with Zero-sequence Filter  

DOE Patents [OSTI]

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.

Muljadi, Eduard (Golden, CO)

1998-08-25T23:59:59.000Z

25

Variable speed wind turbine generator with zero-sequence filter  

DOE Patents [OSTI]

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.

Muljadi, Eduard (Golden, CO)

1998-01-01T23:59:59.000Z

26

Aerodynamic effects on TLP type wind turbines and predictions of the electricity they generate  

Science Journals Connector (OSTI)

This research proposes a new offshore wind energy generation system that uses a tension ... and describes experiments performed on a TLP type wind turbine in both waves and wind. The following conclusions can be ...

Yasunori Nihei; Hiroyuki Fujioka

2011-06-01T23:59:59.000Z

27

Axial Flux, Modular, Permanent-Magnet Generator with a Toroidal Winding for Wind Turbine Applications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

CP-500-24996 Ÿ UC Category: 1213 CP-500-24996 Ÿ UC Category: 1213 Axial Flux, Modular, Permanent- Magnet Generator with a Toroidal Winding for Wind Turbine Applications E. Muljadi C.P. Butterfield Yih-Huei Wan National Wind Technology Center National Renewable Energy Laboratory Presented at IEEE Industry Applications Conference St. Louis, MO November 5-8, 1998 National Renewable Energy Laboratory 1617 Cole Boulevard

28

Preliminary design and viability consideration of external, shroud-based stators in wind turbine generators  

E-Print Network [OSTI]

Horizontal-axis wind turbine designs often included gearboxes or large direct-drive generators to compensate for the low peripheral speeds of the turbine hub. To take advantage of high blade tip speeds, an alternative ...

Shoemaker-Trejo, Nathaniel (Nathaniel Joseph)

2012-01-01T23:59:59.000Z

29

Abstract--Wind power generation is growing rapidly. However, maintaining the wind turbine connection to grid is a real  

E-Print Network [OSTI]

1 Abstract--Wind power generation is growing rapidly. However, maintaining the wind turbine and the generator design. The fixed-speed wind turbine has the advantage of the low cost of A. F. Abdou and H. R advantages over the fixed-speed operation, such as maximum power capture, less mechanical stresses, and less

Pota, Himanshu Roy

30

Grid Connected Doubly Fed Induction Generator Based Wind Turbine under LVRT.  

E-Print Network [OSTI]

??This project concentrates on the Low Voltage Ride Through (LVRT) capability of Doubly Fed Induction Generator (DFIG) wind turbine. The main attention in the project… (more)

Subramanian, Chandrasekaran and#60;1983and#62

2014-01-01T23:59:59.000Z

31

Superconducting generators for large off shore wind turbines   

E-Print Network [OSTI]

This thesis describes four novel superconducting machine concepts, in the pursuit of finding a suitable design for large offshore wind turbines. The designs should be reliable, modular and light-weight. The main novelty ...

Keysan, Ozan

2014-06-30T23:59:59.000Z

32

ARE660 Wind Generator: Low Wind Speed Technology for Small Turbine Development  

SciTech Connect (OSTI)

This project is for the design of a wind turbine that can generate most or all of the net energy required for homes and small businesses in moderately windy areas. The purpose is to expand the current market for residential wind generators by providing cost effective power in a lower wind regime than current technology has made available, as well as reduce noise and improve reliability and safety. Robert W. Preus’ experience designing and/or maintaining residential wind generators of many configurations helped identify the need for an improved experience of safety for the consumer. Current small wind products have unreliable or no method of stopping the wind generator in fault or high wind conditions. Consumers and their neighbors do not want to hear their wind generators. In addition, with current technology, only sites with unusually high wind speeds provide payback times that are acceptable for the on-grid user. Abundant Renewable Energy’s (ARE) basic original concept for the ARE660 was a combination of a stall controlled variable speed small wind generator and automatic fail safe furling for shutdown. The stall control for a small wind generator is not novel, but has not been developed for a variable speed application with a permanent magnet alternator (PMA). The fail safe furling approach for shutdown has not been used to our knowledge.

Robert W. Preus; DOE Project Officer - Keith Bennett

2008-04-23T23:59:59.000Z

33

Return on capital and earned carbon credit by hybrid solar Photovoltaic—wind turbine generators  

Science Journals Connector (OSTI)

This paper presents a methodology to optimise a hybrid solar Photovoltaic—wind turbine generator for the villages situated in ... of India. Owing to good insolation and wind density, the hybrid system composed of...

Prabhakant; Basant Agrawal; G. N. Tiwari

2010-03-01T23:59:59.000Z

34

Wind turbine | Open Energy Information  

Open Energy Info (EERE)

turbine turbine Jump to: navigation, search Dictionary.png Wind turbine: A machine that converts wind energy to mechanical energy; typically connected to a generator to produce electricity. Other definitions:Wikipedia Reegle Contents 1 Types of Wind Turbines 1.1 Vertical Axis Wind Turbines 1.2 Horizontal Axis Wind Turbines 2 Wind Turbine Sizes 3 Components of a Wind Turbine 4 References Types of Wind Turbines There are two basic wind turbine designs: those with a vertical axis (sometimes referred to as VAWTs) and those with a horizontal axis (sometimes referred to as HAWTs). There are several manufacturers of vertical axis turbines, but they have not penetrated the "utility scale" (100 kW capacity and larger) market to the same degree as horizontal axis turbines.[1]

35

Controller for a small induction-generator based wind-turbine  

Science Journals Connector (OSTI)

Design of a low-cost micro-controller for a small induction-generator based grid-connected wind-turbine is presented in this paper. The controller senses the parameters of the wind-turbine generator and the grid, and makes decisions about grid connection and disconnection. Low-cost instrumentation circuitry has been developed to measure the generator and grid parameters. Based on the measurement of voltage and frequency of the wind-turbine generator and the grid side, a control decision is taken to connect the system to the grid. The controller makes decision to disconnect the system from the grid based on the power flow measurement between the wind turbine and the grid. The power flow between wind turbine and the grid depends upon the availability of the wind. The prototype controller has been developed based on a micro-controller PIC16F877 and has been tested in the laboratory.

R. Ahshan; M.T. Iqbal; George K.I. Mann

2008-01-01T23:59:59.000Z

36

Wind shear for large wind turbine generators at selected tall tower sites  

SciTech Connect (OSTI)

The objective of the study described in this report is to examine the nature of wind shear profiles and their variability over the height of large horizontal-axis wind turbines and to provide information on wind shear relevant to the design and opertion of large wind turbines. Wind turbine fatigue life and power quality are related through the forcing functions on the blade to the shapes of the wind shear profiles and their fluctuations over the disk of rotation.

Elliott, D.L.

1984-04-01T23:59:59.000Z

37

Pitch-Controlled Variable-Speed Wind Turbine Generation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Pitch-Controlled Variable-Speed Pitch-Controlled Variable-Speed Wind Turbine Generation February 2000 * NREL/CP-500-27143 E. Muljadi and C.P. Butterfield Presented at the 1999 IEEE Industry Applications Society Annual Meeting Phoenix, Arizona October 3-7, 1999 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute * * * * Battelle * * * * Bechtel Contract No. DE-AC36-99-GO10337 NOTICE The submitted manuscript has been offered by an employee of the Midwest Research Institute (MRI), a contractor of the US Government under Contract No. DE-AC36-99GO10337. Accordingly, the US Government and MRI retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes.

38

Candidate wind turbine generator site: annual data summary, January 1981-December 1981  

SciTech Connect (OSTI)

Summarized hourly meteorological data for 34 candidate and wind turbine generator sites for calendar year 1981 are presented. These data are collected for the purpose of evaluating the wind energy potential at these sites and are used to assist in selection of potential sites for installation and testing of large wind turbines in electric utility systems. For each site, wind speed, direction, and distribution data are given in eight tables. Use of information from these tables, with information about specific wind turbines, should allow the user to estimate the potential for wind energy production at each site.

Sandusky, W.F.; Buck, J.W.; Renne, D.S.; Hadley, D.L.; Abbey, O.B.

1982-07-01T23:59:59.000Z

39

Simulation of a new grid-connected hybrid generation system with Stirling engine and wind turbine  

Science Journals Connector (OSTI)

A detail model including all mechanical and electrical aspects is necessary to fully study hybrid grid operation. In this paper a new grid-connected hybrid generation system with a Stirling engine and a wind turbine which are connected to a grid through a common dc bus is presented. The Stirling is more efficient than photo voltaic array and its combination with the wind turbine can create an efficient hybrid system. Fatigue Aerodynamics Structures and Turbulence and Simulink/MATLAB are used to model the mechanical parts of the wind turbine Stirling engine and electrical parts. Field oriented control method is developed on voltage source converter. Power signal feedback method is implemented to determine generators reference shaft speed in hybrid system. Permanent magnet synchronous generator is used in the wind turbine and Stirling engine. Simulation results show that a new hybrid generation system with Stirling and wind turbine can work like other hybrid system and has suitable performance.

H. Shariatpanah; M. Zareian Jahromi; R. Fadaeinedjad

2013-01-01T23:59:59.000Z

40

Wind turbine  

SciTech Connect (OSTI)

The improvement in a wind turbine comprises providing a tower with a freely liftable mount and adapting a nacelle which is fitted with a propeller windwheel consisting of a plurality of rotor blades and provided therein with means for conversion of wind energy to be shifted onto said mount attached to the tower. In case of a violent wind storm, the nacelle can be lowered down to the ground to protect the rotor blades from breakage due to the force of the wind. Required maintenance and inspection of the nacelle and replacement of rotor blades can be safely carried out on the ground.

Abe, M.

1982-01-19T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Optimal Controller Design of a Wind Turbine with Doubly Fed Induction Generator for Small Signal Stability Enhancement  

Science Journals Connector (OSTI)

Multi-objective optimal controller design of a doubly fed induction generator (DFIG) wind turbine system using Differential Evolution ( ... this chapter. A detailed mathematical model of DFIG wind turbine with a ...

Lihui Yang; Guang Ya Yang; Zhao Xu; Zhao Yang Dong; Yusheng Xue

2010-01-01T23:59:59.000Z

42

How Do Wind Turbines Work?  

Broader source: Energy.gov [DOE]

Instead of using electricity to make wind, like a fan, wind turbines use wind to make electricity. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity.

43

Floating axis wind turbines for offshore power generation—a conceptual study  

Science Journals Connector (OSTI)

The cost of energy produced by offshore wind turbines is considered to be higher than land based ones because of the difficulties in construction, operation and maintenance on offshore sites. To solve the problem, we propose a concept of a wind turbine that is specially designed for an offshore environment. In the proposed concept, a floater of revolutionary shape supports the load of the wind turbine axis. The floater rotates with the turbine and the turbine axis tilts to balance the turbine thrust, buoyancy and gravity. The tilt angle is passively adjustable to wind force. The angle is 30° at rated power. The simplicity of the system leads to further cost reduction of offshore power generation.

Hiromichi Akimoto; Kenji Tanaka; Kiyoshi Uzawa

2011-01-01T23:59:59.000Z

44

Wind turbine generators having wind assisted cooling systems and cooling methods  

DOE Patents [OSTI]

A wind generator includes: a nacelle; a hub carried by the nacelle and including at least a pair of wind turbine blades; and an electricity producing generator including a stator and a rotor carried by the nacelle. The rotor is connected to the hub and rotatable in response to wind acting on the blades to rotate the rotor relative to the stator to generate electricity. A cooling system is carried by the nacelle and includes at least one ambient air inlet port opening through a surface of the nacelle downstream of the hub and blades, and a duct for flowing air from the inlet port in a generally upstream direction toward the hub and in cooling relation to the stator.

Bagepalli, Bharat (Niskayuna, NY); Barnes, Gary R. (Delanson, NY); Gadre, Aniruddha D. (Rexford, NY); Jansen, Patrick L. (Scotia, NY); Bouchard, Jr., Charles G. (Schenectady, NY); Jarczynski, Emil D. (Scotia, NY); Garg, Jivtesh (Cambridge, MA)

2008-09-23T23:59:59.000Z

45

On modelling of grouped reliability data for wind turbines  

Science Journals Connector (OSTI)

......Special Issue Maintenance Modelling...data for wind turbines F. P. A...generation by wind turbines (WTs) has...turbines or maintenance activities...generation by wind turbines (WTs) has...turbines or maintenance activities......

F. P. A. Coolen; F. Spinato; D. Venkat

2010-10-01T23:59:59.000Z

46

EIS-0006: Wind Turbine Generator System, Block Island, Rhode Island  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy prepared this EIS to evaluate the environmental impacts of installing and operating a large experimental wind turbine, designated the MOD-OA, which is proposed to be installed on a knoll in Rhode Island's New Meadow Hill Swamp, integrated with the adjacent Block Island Power Company power plant and operated to supply electricity to the existing utility network.

47

An analytic electromagnetic calculation method for performance evolution of doubly fed induction generators for wind turbines  

Science Journals Connector (OSTI)

An analytic electromagnetic calculation method for doubly fed induction generator (DFIG) in wind turbine system was presented. ... steady state equivalent circuit and basic equations of DFIG, the modeling for ele...

Wen-juan Zhang ???; Shou-dao Huang ???; Jian Gao ??…

2013-10-01T23:59:59.000Z

48

On Impedance Spectroscopy Contribution to Failure Diagnosis in Wind Turbine Generators  

E-Print Network [OSTI]

-fed induction generator, failure diagnosis, impedance spectroscopy. Nomenclature WT = Wind Turbine; DFIG rotor end- rings and harmonic degrading. In particular, DFIG-based WT failure diagnosis seems to become

Boyer, Edmond

49

A Modular Superconducting Generator for Offshore Wind Turbines  

Science Journals Connector (OSTI)

In this study, a new claw-pole type transverse flux superconducting generator topology is presented. The machine has a stationary superconducting field winding, which eliminates electrical brushes and cryocoupler...

Ozan Keysan; Dariusz Olczak…

2013-05-01T23:59:59.000Z

50

Vertical axis wind turbines  

DOE Patents [OSTI]

A vertical axis wind turbine is described. The wind turbine can include a top ring, a middle ring and a lower ring, wherein a plurality of vertical airfoils are disposed between the rings. For example, three vertical airfoils can be attached between the upper ring and the middle ring. In addition, three more vertical airfoils can be attached between the lower ring and the middle ring. When wind contacts the vertically arranged airfoils the rings begin to spin. By connecting the rings to a center pole which spins an alternator, electricity can be generated from wind.

Krivcov, Vladimir (Miass, RU); Krivospitski, Vladimir (Miass, RU); Maksimov, Vasili (Miass, RU); Halstead, Richard (Rohnert Park, CA); Grahov, Jurij (Miass, RU)

2011-03-08T23:59:59.000Z

51

5th International Meeting Wind Turbine Noise  

E-Print Network [OSTI]

1 5th International Meeting on Wind Turbine Noise Denver 28 ­ 30 August 2013 Wind Turbine Noise Broadband noise generated aerodynamically is the dominant noise source for a modern wind turbine(Brooks et, clean energy. While profiting from wind energy, the noise produced by a modern wind turbine becomes

Paris-Sud XI, Université de

52

Wind Turbine Basics | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Wind Turbine Basics Wind Turbine Basics Wind Turbine Basics July 30, 2013 - 2:58pm Addthis Energy 101: Wind Turbines Basics This video explains the basics of how wind turbines operate to produce clean power from an abundant, renewable resource-the wind. Text Version Wind turbine assembly Although all wind turbines operate on similar principles, several varieties are in use today. These include horizontal axis turbines and vertical axis turbines. Horizontal Axis Turbines Horizontal axis turbines are the most common turbine configuration used today. They consist of a tall tower, atop which sits a fan-like rotor that faces into or away from the wind, a generator, a controller, and other components. Most horizontal axis turbines built today are two- or three-bladed. Horizontal axis turbines sit high atop towers to take advantage of the

53

Comparative Assessment of Direct Drive High Temperature Superconducting Generators in Multi-Megawatt Class Wind Turbines  

SciTech Connect (OSTI)

This paper summarizes the work completed under the CRADA between NREL and American Superconductor (AMSC). The CRADA combined NREL and AMSC resources to benchmark high temperature superconducting direct drive (HTSDD) generator technology by integrating the technologies into a conceptual wind turbine design, and comparing the design to geared drive and permanent magnet direct drive (PMDD) wind turbine configurations. Analysis was accomplished by upgrading the NREL Wind Turbine Design Cost and Scaling Model to represent geared and PMDD turbines at machine ratings up to 10 MW and then comparing cost and mass figures of AMSC's HTSDD wind turbine designs to theoretical geared and PMDD turbine designs at 3.1, 6, and 10 MW sizes. Based on the cost and performance data supplied by AMSC, HTSDD technology has good potential to compete successfully as an alternative technology to PMDD and geared technology turbines in the multi megawatt classes. In addition, data suggests the economics of HTSDD turbines improve with increasing size, although several uncertainties remain for all machines in the 6 to 10 MW class.

Maples, B.; Hand, M.; Musial, W.

2010-10-01T23:59:59.000Z

54

Status of Power Generation by Domestic Scale Wind Turbines in Australia  

Science Journals Connector (OSTI)

The world's fossil fuel energy resources are diminishing at a faster rate and most importantly the liquid fossil fuel is expected to be finished by 2060s. Moreover, the fossil fuel is directly related to air pollution, land and water degradation. The danger of climate change due to global warming caused by greenhouse gas emissions compels the policy makers, scientists and researchers globally to explore power generation from renewable sources such as wind. Despite significant progresses have been made in power generation using large scale wind turbines recently, domestic scale wind turbines that have immense potentials for standalone power generation are not explored and adequately researched. Therefore, the primary objective of this study is to review and analyse the potentials for power generation by domestic scale wind turbines for the residential and semi-commercial applications. The study reviews the current status of wind characteristics in built-up areas, economic feasibility, aerodynamic and technological limits, local government planning requirement, local and foreign small scale wind turbine manufacturers.

Firoz Alam; Abdulkadir Ali; Iftekhar Khan; Saleh Mobin

2012-01-01T23:59:59.000Z

55

Operational behavior of a double-fed permanent magnet generator for wind turbines  

E-Print Network [OSTI]

Greater efficiency in wind turbine systems is achieved by allowing the rotor to change its rate of rotation as the wind speed changes. The wind turbine system is decoupled from the utility grid and a variable speed operation ...

Reddy, Sivananda Kumjula

2005-01-01T23:59:59.000Z

56

Strategies for Refining IEC 61400-2: Wind Turbine Generator Systems - Part 2: Safety of Small Wind Turbines: Preprint  

SciTech Connect (OSTI)

This paper provides a status of the changes currently being made by IEC Maintenance Team 02 (MT02) to the existing IEC 61400-2 ''Safety of small wind turbines.'' In relation to the work done by IEC MT02, work has been done by NREL and Windward Engineering under the DOE/NREL Small Wind Turbine (SWT) Project. Aeroelastic models were built and measurements taken on a Whisper H40 turbine and an AOC 15/50. Results from this study were used to verify the simple design equations. This verification will be used to evaluate how changes made in the design load estimation section of the standard work out for a broad range of turbine configurations. The work presented here builds on work performed by Van Hulle (1996).

van Dam, J. J. D. (Energy Research Centre of the Netherlands); Forsyth, T. L. (National Renewable Energy Laboratory); Hansen, A. C. (Windward Engineering LLC)

2001-10-19T23:59:59.000Z

57

Wind Turbine Basics | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Turbine Basics Turbine Basics Wind Turbine Basics July 30, 2013 - 2:58pm Addthis Energy 101: Wind Turbines Basics This video explains the basics of how wind turbines operate to produce clean power from an abundant, renewable resource-the wind. Text Version Wind turbine assembly Although all wind turbines operate on similar principles, several varieties are in use today. These include horizontal axis turbines and vertical axis turbines. Horizontal Axis Turbines Horizontal axis turbines are the most common turbine configuration used today. They consist of a tall tower, atop which sits a fan-like rotor that faces into or away from the wind, a generator, a controller, and other components. Most horizontal axis turbines built today are two- or three-bladed. Horizontal axis turbines sit high atop towers to take advantage of the

58

Airborne Wind Turbine  

SciTech Connect (OSTI)

Broad Funding Opportunity Announcement Project: Makani Power is developing an Airborne Wind Turbine (AWT) that eliminates 90% of the mass of a conventional wind turbine and accesses a stronger, more consistent wind at altitudes of near 1,000 feet. At these altitudes, 85% of the country can offer viable wind resources compared to only 15% accessible with current technology. Additionally, the Makani Power wing can be economically deployed in deep offshore waters, opening up a resource which is 4 times greater than the entire U.S. electrical generation capacity. Makani Power has demonstrated the core technology, including autonomous launch, land, and power generation with an 8 meter wingspan, 20 kW prototype. At commercial scale, Makani Power aims to develop a 600 kW, 28 meter wingspan product capable of delivering energy at an unsubsidized cost competitive with coal, the current benchmark for low-cost power.

None

2010-09-01T23:59:59.000Z

59

Direct Power Control of Doubly-Fed Generator Based Wind Turbine Converters to Improve Low Voltage  

E-Print Network [OSTI]

Control (DPC) is discussed for Low Voltage Ride Through (LVRT) of DFIG based wind turbine converters power integration state that doubly fed induction generator (DFIG) controllers should be capable and maintaining dc bus voltage, then the DFIG will stay online during the disturbance. A fast acting controller

Kimball, Jonathan W.

60

Vertical axis wind turbine  

SciTech Connect (OSTI)

Wind turbines are largely divided into vertical axis wind turbines and propeller (Horizontal axis) wind turbines. The present invention discloses a vertical axis high speed wind turbine provided with rotational speed control systems. This vertical axis wind turbine is formed by having blades of a proper airfoil fitted to respective supporting arms provided radially from a vertical rotating shaft by keeping the blade span-wise direction in parallel with the shaft and being provided with aerodynamic control elements operating manually or automatically to control the rotational speed of the turbine.

Kato, Y.; Seki, K.; Shimizu, Y.

1981-01-27T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Wind Turbine Tribology Seminar  

Broader source: Energy.gov [DOE]

Wind turbine reliability issues are often linked to failures of contacting components, such as bearings, gears, and actuators. Therefore, special consideration to tribological design in wind...

62

Wind turbine generator interaction with conventional diesel generators on Block Island, Rhode Island. Volume II. Data analysis  

SciTech Connect (OSTI)

In order to assess the performance of a MOD-OA horizontal axis wind turbine when connected to an isolated diesel utility, a comprehensive data measurement program was conducted on the Block Island Power Company installation on Block Island, Rhode Island. This report presents the detailed results of that program focusing on three principal areas of (1) fuel displacement (savings), (2) dynamic interaction between the diesel utility and the wind turbine, (3) effects of three modes of wind turbine reactive power control. The approximate two month duration of the data acquisition program conducted in the winter months (February into April 1982) revealed performance during periods of highest wind energy penetration and hence severity of operation. It is concluded that even under such conditions fuel savings were significant resulting in a fuel reduction of 6.7% while the MOD-OA was generating 10.7% of the total electrical energy. Also, electrical disturbance and interactive effects were of an acceptable level.

Wilreker, V.F.; Stiller, P.H.; Scott, G.W.; Kruse, V.J.; Smith, R.F.

1984-02-01T23:59:59.000Z

63

A concept of power generator using wind turbine, hydrodynamic retarder, and organic Rankine cycle drive  

Science Journals Connector (OSTI)

This paper describes a concept of electric power generating system that uses a wind turbine to generate kinetic energy which converts heat through a hydrodynamic retarder. The heat so generated is utilized to drive an organic Rankine cycle that converts thermal energy into electricity power for continuous and undisrupted supply during the year. A hydrodynamic retarder converts kinetic energy into heat through hot fluid by directing the flow of the fluid into the hydrodynamic retarder in a manner that resists rotation of blades of the wind turbine. The hot fluid circulating in the hydrodynamic retarder is a thermal heat source for vapor regeneration of organic heat exchange fluid mixture(s) used in the Rankine cycle. The expansion of the organic heat exchange fluid gets converted into rotation of the generator rotor.

Samuel Sami

2013-01-01T23:59:59.000Z

64

On modelling of grouped reliability data for wind turbines  

Science Journals Connector (OSTI)

......generation by wind turbines (WTs) has...large-scale offshore developments...generation by wind turbines (WTs) has...large-scale offshore developments...UK, most wind turbines (WTs) have...likely that offshore WTs will play......

F. P. A. Coolen; F. Spinato; D. Venkat

2010-10-01T23:59:59.000Z

65

Energy 101: Wind Turbines | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Wind Turbines Wind Turbines Energy 101: Wind Turbines Addthis Description See how wind turbines generate clean electricity from the power of the wind. Highlighted are the various parts and mechanisms of a modern wind turbine. Duration 2:16 Topic Tax Credits, Rebates, Savings Wind Energy Economy Credit Energy Department Video MR. : We've all seen those creaky old windmills on farms, and although they may seem about as low-tech as you can get, those old windmills are the predecessors for new modern wind turbines that generate electricity. The same wind that used to pump water for cattle is now turning giant wind turbines to power cities and homes. OK, have a look at this wind farm in the California desert, a hot desert next to tall mountains - an ideal place for a lot of wind.

66

Vertical axis wind turbine  

SciTech Connect (OSTI)

Wind turbines are largely divided into vertical axis wind turbines and propeller (Horizontal axis) wind turbines. The present invention discloses a vertical axis high speed wind turbine provided with a starting and braking control system. This vertical axis wind turbine is formed by having blades of a proper airfoil fitted to respective supporting arms provided radially from a vertical rotary axis by keeping the blade span-wise direction in parallel with the axis and being provided with a low speed control windmill in which the radial position of each operating piece varies with a centrifugal force produced by the rotation of the vertical rotary axis.

Kato, Y.; Seki, K.; Shimizu, Y.

1981-01-27T23:59:59.000Z

67

Energy 101: Wind Turbines - 2014 Update  

ScienceCinema (OSTI)

See how wind turbines generate clean electricity from the power of wind. The video highlights the basic principles at work in wind turbines, and illustrates how the various components work to capture and convert wind energy to electricity. This updated version also includes information on the Energy Department's efforts to advance offshore wind power. Offshore wind energy footage courtesy of Vestas.

None

2014-06-05T23:59:59.000Z

68

Energy 101: Wind Turbines - 2014 Update  

SciTech Connect (OSTI)

See how wind turbines generate clean electricity from the power of wind. The video highlights the basic principles at work in wind turbines, and illustrates how the various components work to capture and convert wind energy to electricity. This updated version also includes information on the Energy Department's efforts to advance offshore wind power. Offshore wind energy footage courtesy of Vestas.

None

2014-05-06T23:59:59.000Z

69

Offshore Wind Turbines and Their Installation  

Science Journals Connector (OSTI)

Offshore winds tend to be higher, more constant and not disturbed by rough terrain, so there is a large potential for utilizing wind energy near to the sea. Compared with the wind energy converters onland, wind turbine components offshore will subject ... Keywords: renewable energy, wind power generation, offshore wind turbines, offshore installation

Liwei Li; Jianxing Ren

2010-01-01T23:59:59.000Z

70

Tornado type wind turbines  

DOE Patents [OSTI]

A tornado type wind turbine has a vertically disposed wind collecting tower with spaced apart inner and outer walls and a central bore. The upper end of the tower is open while the lower end of the structure is in communication with a wind intake chamber. An opening in the wind chamber is positioned over a turbine which is in driving communication with an electrical generator. An opening between the inner and outer walls at the lower end of the tower permits radially flowing air to enter the space between the inner and outer walls while a vertically disposed opening in the wind collecting tower permits tangentially flowing air to enter the central bore. A porous portion of the inner wall permits the radially flowing air to interact with the tangentially flowing air so as to create an intensified vortex flow which exits out of the top opening of the tower so as to create a low pressure core and thus draw air through the opening of the wind intake chamber so as to drive the turbine.

Hsu, Cheng-Ting (Ames, IA)

1984-01-01T23:59:59.000Z

71

Variable susceptance excitation control for dynamic performance improvement of a stand-alone wind turbine induction generator system  

Science Journals Connector (OSTI)

Isolated wind farms employ simple squirrel cage induction generators driven by variable speed wind turbines. Lacking control capability, such generation can contribute very little to network support. Wind turbines mostly do not take part in voltage and frequency control and if a disturbance occurs, the turbines may be disconnected and reconnected when normal operation has been resumed. From operation viewpoint, this is definitely not acceptable. A primary reason for the rigidity of operation is the lack of excitation adaptation under variable wind conditions. This article proposes incorporation of a variable capacitance controller at the generator terminal which will automatically adjust the needed excitation. Further improvement of transient profile of the stand-alone wind turbine generator has been proposed through inclusion of additional stabilising control. Simulation studies show that the proposed excitation controller with additional PID circuit provides very good transient profile following reasonable input torque variations.

A.H.M.A. Rahim; M. Ahsanul Alam

2009-01-01T23:59:59.000Z

72

Towers for Offshore Wind Turbines  

Science Journals Connector (OSTI)

Increasing energy demand coupled with pollution free production of energy has found a viable solution in wind energy. Land based windmills have been utilized for power generation for more than two thousand years. In modern times wind generated power has become popular in many countries. Offshore wind turbines are being used in a number of countries to tap the energy from wind over the oceans and convert to electric energy. The advantages of offshore wind turbines as compared to land are that offshore winds flow at higher speed than onshore winds and the more available space. In some land based settings for better efficiency turbines are separated as much as 10 rotor diameters from each other. In offshore applications where only two wind directions are likely to predominate the distances between the turbines arranged in a line can be shortened to as little as two or four rotor diameters. Today more than a dozen offshore European wind facilities with turbine ratings of 450 kw to 3.6 MW exist offshore in very shallow waters of 5 to 12 m. Compared to onshore wind turbines offshore wind turbines are bigger and the tower height in offshore are in the range of 60 to 80 m. The water depths in oceans where offshore turbines can be located are within 30 m. However as the distance from land increases the costs of building and maintaining the turbines and transmitting the power back to shore also increase sharply. The objective of this paper is to review the parameters of design for the maximum efficiency of offshore wind turbines and to develop types offshore towers to support the wind turbines. The methodology of design of offshore towers to support the wind turbine would be given and the environmental loads for the design of the towers would be calculated for specific cases. The marine corrosion on the towers and the methods to control the corrosion also would be briefly presented. As the wind speeds tend to increase with distance from the shore turbines build father offshore will be able to capture more wind energy. Currently two types of towers are considered. Cylindrical tubular structures and truss type structures. But truss type structures have less weight and flexibility in design. The construction of the offshore towers to harness the wind energy is also presented. The results will include the calculation of wind and wave forces on the tower and the design details for the tower.

V. J. Kurian; S. P. Narayanan; C. Ganapathy

2010-01-01T23:59:59.000Z

73

Fixed Offshore Wind Turbines  

Science Journals Connector (OSTI)

In this chapter, a perspective of offshore wind farms, applied concepts for fixed offshore wind turbines, and related statistics are given. One example of a large wind farm, which is successfully operating, is st...

Madjid Karimirad

2014-01-01T23:59:59.000Z

74

Wind turbine generator interaction with conventional diesel generators on Block Island, Rhode Island. Volume 1. Executive summary  

SciTech Connect (OSTI)

This report summarizes the primary results of a three-part study involving the effects of connecting a MOD-OA wind turbine generator to an isolated diesel power system. The subject utility is that owned and operated by the Block Island Power Company (BIPCO). The MOD-OA installation here was the third of four experimental nominal 200 kW wind turbines connected to various utilities under the Federal Wind Energy Program. The BIPCO installation was characterized by the highest wind energy penetration levels of four sites and, as such, was adjudged the best candidate for conducting the data acquisition and analysis effort that is the subject of this study. The three-phases of the study analysis address: (1) fuel displacement, (2) dynamic interaction, and (3) three modes of reactive power control. These analyses all have as their basis the results of the data acquisition program conducted during 1982 from February into April on Block Island, Rhode Island.

Wilreker, V.F.; Stiller, P.H.; Scott, G.W.; Kruse, V.J.; Smith, R.F.

1984-02-01T23:59:59.000Z

75

Wind Turbines Benefit Crops  

SciTech Connect (OSTI)

Ames Laboratory associate scientist Gene Takle talks about research into the effect of wind turbines on nearby crops. Preliminary results show the turbines may have a positive effect by cooling and drying the crops and assisting with carbon dioxide uptake.

Takle, Gene

2010-01-01T23:59:59.000Z

76

Optimum propeller wind turbines  

SciTech Connect (OSTI)

The Prandtl-Betz-Theodorsen theory of heavily loaded airscrews has been adapted to the design of propeller windmills which are to be optimized for maximum power coefficient. It is shown that the simpler, light-loading, constant-area wake assumption can generate significantly different ''optimum'' performance and geometry, and that it is therefore not appropriate to the design of propeller wind turbines when operating in their normal range of high-tip-speed-to-wind-speed ratio. Design curves for optimum power coefficient are presented and an example of the design of a typical two-blade optimum rotor is given.

Sanderson, R.J.; Archer, R.D.

1983-11-01T23:59:59.000Z

77

Energy 101: Wind Turbines | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Wind Turbines Wind Turbines Energy 101: Wind Turbines Addthis Below is the text version for the Energy 101: Wind Turbines video. The video opens with "Energy 101: Wind Turbines." This is followed by wooden windmills on farms. We've all seen those creaky, old windmills on farms. And although they may seem about as low-tech as you can get, those old windmills are the predecessors for new, modern wind turbines that generat electricity. The video pans through shots of large windmills and wind farms of different sizes, situated on cultivated plains and hills. The same wind that used to pump water for cattle is now turning giant wind turbines to power cities and homes. OK, have a look at this wind farm in the California desert. A hot desert, next to tall mountains. An ideal place for a lot of wind.

78

Learning About Wind Turbine Technology, Motors and Generators...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of different variations of motors and generators. Motors are used to convert electric energy from the grid into mechanical energy and can be found in dozens of products in every...

79

Numerical Modeling and Optimization of Power Generation from Shrouded Wind Turbines.  

E-Print Network [OSTI]

??In recent years, it has been theoretically suggested by some researchers that the power coefficient of a wind turbine can be increased beyond the Betz… (more)

Foote, Tudor

2011-01-01T23:59:59.000Z

80

Barstow Wind Turbine Project  

Broader source: Energy.gov [DOE]

Presentation covers the Barstow Wind Turbine project for the Federal Utility Partnership Working Group (FUPWG) meeting, held on November 18-19, 2009.

Note: This page contains sample records for the topic "wind turbines generate" 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

3/5/2014 TinyMicro Wind Turbines Generate Electricity| New Energyand Fuel http://newenergyandfuel.com/http:/newenergyandfuel/com/2014/01/16/tiny-micro-wind-turbines-generate-electricity/ 1/12  

E-Print Network [OSTI]

Geothermal Heat Harvesting Hydro Power Generation Lighting Materials Money and Finance Ocean Tide & Current Coal Diesel Gasoline Natural Gas #1 Stock to Buy Right Now Top-Rated Generator Pros Wind Turbine Tech Classes Tri-Fuel Generators 10KW Generator- $939 www.generatordepot... Portable, Elec. Start, Warranty All-Power

Chiao, Jung-Chih

82

Foundations for offshore wind turbines  

Science Journals Connector (OSTI)

...T. Thompson Foundations for offshore wind turbines B. W. Byrne G. T...civil-engineering problems encountered for offshore wind turbines. A critical component...energy suppliers. Foundations|Offshore Wind Turbines|Renewable Energy...

2003-01-01T23:59:59.000Z

83

Scale Models & Wind Turbines  

Broader source: Energy.gov (indexed) [DOE]

Scale Models and Wind Turbines Grades: 5-8, 9-12 Topics: Wind Energy Owner: Kidwind Project This educational material is brought to you by the U.S. Department of Energy's Office of...

84

NREL: Wind Research - Small Wind Turbine Development  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Small Wind Turbine Development Small Wind Turbine Development A photo of Southwest Windpower's Skystream wind turbine in front of a home. PIX14936 Southwest Windpower's Skystream wind turbine. A photo of the Endurance wind turbine. PIX15006 The Endurance wind turbine. A photo of the Atlantic Orient Corporation 15/50 wind turbine at the National Wind Technology Center. PIX07301 The Atlantic Orient Corporation 15/50 wind turbine at the National Wind Technology Center. NREL supports continued market expansion of small wind turbines by funding manufacturers through competitive solicitations (i.e., subcontracts and/or grants) to refine prototype systems leading to commercialization. Learn more about the turbine development projects below. Skystream NREL installed and tested an early prototype of this turbine at the

85

Howden Wind Turbines Ltd | Open Energy Information  

Open Energy Info (EERE)

Howden Wind Turbines Ltd Jump to: navigation, search Name: Howden Wind Turbines Ltd Place: United Kingdom Sector: Wind energy Product: Howden was a manufacturer of wind turbines in...

86

Wind Turbine Blade Design  

K-12 Energy Lesson Plans and Activities Web site (EERE)

Blade engineering and design is one of the most complicated and important aspects of modern wind turbine technology. Engineers strive to design blades that extract as much energy from the wind as possible throughout a range of wind speeds and gusts, yet are still durable, quiet and cheap. A variety of ideas for building turbines and teacher handouts are included in this document and at the Web site.

87

Permanent Magnet Generators (PMG) for Wind Turbines and Micro Hydro Turbines  

Science Journals Connector (OSTI)

There are essential differences in the design of systems for water/air flow kinetic energy conversion into mechanical energy. First of all, speeds of rotation of the turbine rotors are different: the speed of tho...

Ion Bostan; Adrian Gheorghe; Valeriu Dulgheru; Ion Sobor…

2013-01-01T23:59:59.000Z

88

Techniques for Enhancing Wind Energy Generation - A CFD Based Multibody Dynamics Approach in Horizontal Axis Wind Turbines.  

E-Print Network [OSTI]

??Wind energy has emerged as a major sustainable source of energy.The efficiency of wind power generation by wind mills has improved a lot during the… (more)

Rajendran, C

2011-01-01T23:59:59.000Z

89

Power Electronic Control for Wind Generation Systems  

Science Journals Connector (OSTI)

...? mathematical models for wind turbines such as wind turbine (WT) with doubly fed induction generator (DFIG) and WT with direct-drive permanent magnet...

Xiao-Ping Zhang; Christian Rehtanz…

2012-01-01T23:59:59.000Z

90

NREL: Wind Research - Small Wind Turbine Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Small Wind Turbine Research Small Wind Turbine Research The National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Small Wind Project's objectives are to reduce barriers to wind energy expansion, stabilize the market, and expand the number of small wind turbine systems installed in the United States. "Small wind turbine" refers to a turbine smaller than or equal to 100 kilowatts (kW). "Distributed wind" includes small and midsize turbines (100 kW through 1 megawatt [MW]). Since 1996, NREL's small wind turbine research has provided turbine testing, turbine development, and prototype refinement leading to more commercially available small wind turbines. Work is conducted under the following areas. You can also learn more about state and federal policies

91

NREL: Wind Research - Midsize Wind Turbine Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Midsize Wind Turbine Research Midsize Wind Turbine Research To facilitate the development and commercialization of midsize wind turbines (turbines with a capacity rating of more than 100 kW up to 1 MW), the U.S. Department of Energy (DOE) and NREL launched the Midsize Wind Turbine Development Project. In its latest study, NREL determined that there is a substantial market for midsize wind turbines. One of the most significant barriers to the midsize turbine market is the lack of turbines available for deployment; there are few midsize turbines on the market today. The objectives of the Midsize Wind Turbine Development Project are to reduce the barriers to wind energy expansion by filling an existing domestic technology gap; facilitate partnerships; accelerate maturation of existing U.S. wind energy businesses; and incorporate process improvement

92

Physical modeling of wind turbine generators in a small scale analog system  

E-Print Network [OSTI]

This project represents the physical modeling and experimental test of a Doubly-fed Induction Machine (DFIM), in order to substantially analyze the characteristic behaviors of wind turbines and its use in the micro-grid ...

Wang, Xuntuo

2014-01-01T23:59:59.000Z

93

Definition: Wind turbine | Open Energy Information  

Open Energy Info (EERE)

turbine turbine Jump to: navigation, search Dictionary.png Wind turbine A machine that converts wind energy to mechanical energy; typically connected to a generator to produce electricity.[1][2] View on Wikipedia Wikipedia Definition A wind turbine is a device that converts kinetic energy from the wind, also called wind energy, into mechanical energy in a process known as wind power. If the mechanical energy is used to produce electricity, the device may be called a wind turbine or wind power plant. If the mechanical energy is used to drive machinery, such as for grinding grain or pumping water, the device is called a windmill or wind pump. Similarly, it may be referred to as a wind charger when used for charging batteries. The result of over a millennium of windmill development and modern engineering,

94

NREL: Learning - Wind Energy Basics: How Wind Turbines Work  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Wind Energy Basics: How Wind Turbines Work Wind Energy Basics: How Wind Turbines Work We have been harnessing the wind's energy for hundreds of years. From old Holland to farms in the United States, windmills have been used for pumping water or grinding grain. Today, the windmill's modern equivalent-a wind turbine-can use the wind's energy to generate electricity. Wind turbines, like windmills, are mounted on a tower to capture the most energy. At 100 feet (30 meters) or more aboveground, they can take advantage of the faster and less turbulent wind. Turbines catch the wind's energy with their propeller-like blades. Usually, two or three blades are mounted on a shaft to form a rotor. A blade acts much like an airplane wing. When the wind blows, a pocket of low-pressure air forms on the downwind side of the blade. The low-pressure

95

Tribological advancements for reliable wind turbine performance  

Science Journals Connector (OSTI)

...the gearbox components. Wind turbine gearboxes experience...the generators to the power grid, respectively...can produce a torsional wind-up of the components...Pontius2009Main shaft support for wind turbine with a fixed and...44061999 Hydraulic fluid power-fluids-method of coding...

2010-01-01T23:59:59.000Z

96

Effects of vortex generators on a blunt trailing-edge airfoil for wind turbines  

Science Journals Connector (OSTI)

Abstract Vortex generators (VGs) are commonly-used effective flow separation control devices, and are proved to have potential to improve the aerodynamic performance of large wind turbines. In this paper, the flow physics of \\{VGs\\} and how their size affects the aerodynamic performance of a blunt trailing-edge airfoil DU97-W-300 have been investigated using CFD simulations. Based on wind turbine dedicated airfoil with and without \\{VGs\\} respectively, three-dimensional numerical models were established and further validated through the comparisons between the numerical results and the experimental data. The effects of VGs' size were analyzed from several perspectives, such as trailing-edge height, length, short and long spacing between an adjacent pair of VGs. The results indicate that drag penalty is more sensitive to the increase of VG height than lift; an increment of VG length leads to negative effects on both lift and drag; increases of the spacing between an adjacent pair of \\{VGs\\} have positive impact on suppression of separated flow. Additionally, the flow field characteristics were further revealed by the analysis of streamlines and vortices in the wake region.

Linyue Gao; Hui Zhang; Yongqian Liu; Shuang Han

2015-01-01T23:59:59.000Z

97

The Inside of a Wind Turbine | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

the one shown here-face into the wind while downwind turbines face away. Wind turbines harness the power of the wind and use it to generate electricity. Simply stated, a...

98

Wind Turbine Blockset General Overview  

E-Print Network [OSTI]

Wind Turbine Blockset in Saber General Overview and Description of the Models Florin Iov, Adrian Turbine Blockset in Saber Abstract. This report presents a new developed Saber Toolbox for wind turbine, optimize and design wind turbines". The report provides a quick overview of the Saber and then explains

99

How Does a Wind Turbine Work?  

Broader source: Energy.gov [DOE]

Wind turbines operate on a simple principle. The energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to...

100

Grid Connected based PWM Converter Applied a Self-excited Induction Generator for Wind Turbine Applications  

Science Journals Connector (OSTI)

Abstract This paper presents the electrical power conversion system which is developed for a self-excited induction generator in order to apply with wind turbine. In the wind energy conversion system, a self-excited induction generator is converted the mechanical energy into electrical energy. A B6 rectifier and capacitor are utilized to maintain constant intermediate DC voltage. The average power is converted entirely by the PWM converter, consists of B6 voltage-source inverters. Output currents and active power of switch mode voltage source inverter are flowed into utility grid by current control and PQ theory technique. For the hardware implementation, the system consists of 1 kW four poles self excited induction generator and the voltage source inverter controlled output current by hysteresis controller(bang-bang) method. The algorithm is implemented in a dSPACS ds1104DSP together with MATLAB/SIMULINK program. The validity of the proposed method is verified by both simulation and experimental results under power transferred into grid in term of power quality such as real power, reactive power, total harmonics distortion, and so on.

Satean Tunyasrirut; Chakrapong Charumit

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

NREL: Wind Research - Mariah Power's Windspire Wind Turbine Testing and  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mariah Power's Windspire Wind Turbine Testing and Results Mariah Power's Windspire Wind Turbine Testing and Results A video of Mariah Power's Windspire wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL tested Mariah Power's Windspire Giromill small wind turbine at the National Wind Technology Center (NWTC) through January 14, 2009 when NREL terminated its testing. Read a chronology of events and letter from Mariah Power to NREL. The Windspire is a 1.2-kilowatt (kW) vertical-axis small wind turbine. The turbine tower is 9.1 meters tall, and its rotor area is 1.2 by 6.1 meters. The turbine has a permanent-magnet generator with a single-phase output at 120 volts AC. Testing Summary Testing was terminated January 14, 2009. Published test reports include

102

Energy 101: Wind Turbines | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Wind Turbines Wind Turbines Energy 101: Wind Turbines July 30, 2010 - 10:47am Addthis John Schueler John Schueler Former New Media Specialist, Office of Public Affairs On Tuesday, the Department announced a $117 million loan guarantee through for the Kahuku Wind Power Project in Hawaii. That's a major step forward for clean energy in the region, as it's expected to supply clean electricity to roughly 7,700 households per year, and it also invites a deceptively simple question: how exactly do wind turbines generate electricity? One thing you might not realize is that wind is actually a form of solar energy. This is because wind is produced by the sun heating Earth's atmosphere, the rotation of the earth, and the earth's surface irregularities. Wind turbines are the rotary devices that convert the

103

Responses of floating wind turbines to wind and wave excitation  

E-Print Network [OSTI]

The use of wind power has recently emerged as a promising alternative to conventional electricity generation. However, space requirements and public pressure to place unsightly wind turbines out of visual range make it ...

Lee, Kwang Hyun

2005-01-01T23:59:59.000Z

104

Revenue Maximization of Electricity Generation for a Wind Turbine Integrated with a Compressed Air Energy Storage System  

E-Print Network [OSTI]

controller is developed for a Compressed Air Energy Storage (CAES) system integrated with a wind turbine storage vessel. The storage vessel contains both liquid and compressed air at the same pressure. Energy significant reduction in generation costs. Among all different types of energy storage approaches, compressed

Li, Perry Y.

105

Distributed Wind Turbines | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Distributed Wind Turbines Distributed Wind Turbines Addthis 1 of 11 Three 100 kilowatt (kW) wind turbines in Bisaccia, Italy. Last year, U.S. small wind turbines were exported to...

106

Unbalanced-grid-fault ride-through control for a doubly fed induction generator wind turbine with series grid-side converter  

Science Journals Connector (OSTI)

The grid codes now require doubly fed induction generator (DFIG) wind turbines having the "low voltage ride-through (LVRT)" capability. However, a traditional DFIG with a partially rated back-to-back converter has inherent difficulties to ride through ... Keywords: doubly fed induction generator (DFIG), low voltage ride-through (LVRT), series grid-side converter (SGSC), unbalanced grid fault, voltage dips, voltage sags, wind power generation, wind turbine

Yong Liao; Hui Li; Jun Yao

2011-02-01T23:59:59.000Z

107

Optimization of Wind Turbine Operation  

E-Print Network [OSTI]

inclination angle was about 1°. The spinner anemometer measurements were correlated with wind speed and windOptimization of Wind Turbine Operation by Use of Spinner Anemometer TF Pedersen, NN Sørensen, L Title: Optimization of Wind Turbine Operation by Use of Spinner Anemometer Department: Wind Energy

108

Model Predictive Control Wind Turbines  

E-Print Network [OSTI]

Model Predictive Control of Wind Turbines Martin Klauco Kongens Lyngby 2012 IMM-MSc-2012-65 #12;Summary Wind turbines are the biggest part of the green energy industry. Increasing interest control strategies. Control strategy has a significant impact on the wind turbine operation on many levels

109

NREL: Wind Research - SWIFT Wind Turbine Testing and Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

SWIFT Wind Turbine Testing and Results SWIFT Wind Turbine Testing and Results The SWIFT wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL is testing the SWIFT small wind turbine at the National Wind Technology Center (NWTC). The competitive grant was awarded to Cascade Engineering. The SWIFT is a 1-kilowatt (kW), five-bladed with outer ring, horizontal-axis upwind small wind turbine. The turbine's rotor diameter is 2 meters, and its hub height is 13.72 meters. The SWIFT uses a single-phase permanent-magnet generator rated at 1 kW grid connected through an inverter at 240 volts AC. Testing Summary Supporting data and explanations for data provided in this table will be provided in the final reports. Data presented are preliminary and subject

110

An Exploration of Wind Energy & Wind Turbines | Department of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

An Exploration of Wind Energy & Wind Turbines An Exploration of Wind Energy & Wind Turbines Below is information about the student activitylesson plan from your search. Grades...

111

Category:Wind turbine | Open Energy Information  

Open Energy Info (EERE)

turbine Jump to: navigation, search Pages in category "Wind turbine" This category contains only the following page. W Wind turbine Retrieved from "http:en.openei.orgw...

112

Hybrid Electro-Mechanical Simulation Tool for Wind Turbine Generators: Preprint  

SciTech Connect (OSTI)

This paper describes the use of MATLAB/Simulink to simulate the electrical and grid-related aspects of a WTG and the FAST aero-elastic wind turbine code to simulate the aerodynamic and mechanical aspects of the WTG. The combination of the two enables studies involving both electrical and mechanical aspects of the WTG.

Singh, M.; Muljadi, E.; Jonkman, J.

2013-05-01T23:59:59.000Z

113

Original articles: Flicker mitigation in a doubly fed induction generator wind turbine system  

Science Journals Connector (OSTI)

This paper describes a doubly fed induction generator (DFIG) control for wind energy generation. The DFIG model is established and the adopted control strategies for machine side and grid side converters are described. Flicker phenomenon is defined and ... Keywords: Doubly fed induction generator, Flicker, Machine side converter, Power quality, Wind power generation

Mohamed Machmoum; Ahmad Hatoum; Toufik Bouaouiche

2010-10-01T23:59:59.000Z

114

Lightning protection system for a wind turbine  

DOE Patents [OSTI]

In a wind turbine (104, 500, 704) having a plurality of blades (132, 404, 516, 744) and a blade rotor hub (120, 712), a lightning protection system (100, 504, 700) for conducting lightning strikes to any one of the blades and the region surrounding the blade hub along a path around the blade hub and critical components of the wind turbine, such as the generator (112, 716), gearbox (708) and main turbine bearings (176, 724).

Costin, Daniel P. (Chelsea, VT); Petter, Jeffrey K. (Williston, VT)

2008-05-27T23:59:59.000Z

115

Estimation of Wind Speed in Connection to a Wind Turbine  

E-Print Network [OSTI]

horizontal axis wind power plant with rated power 750 KW. The plant has a three bladed rotor and an automatic is shown in Figure 1 demand Drive train Generator Rotor Wind speed Power demand Grid Power Controller PitchEstimation of Wind Speed in Connection to a Wind Turbine X. Ma #3; , N. K. Poulsen #3; , H. Bindner

116

Simulation of Sensor Fault Diagnosis for Wind Turbine Generators DFIG and PMSM Using Kalman Filter  

Science Journals Connector (OSTI)

Abstract The fault detection and isolation of generators used in wind turbines gathering interest as to maximize the reliability and avail of distributed energy systems with recent unmatched growth in construction of offshore wind farms. In particular it is interested in performing fault detection and isolation (FDI) of incipient faults affecting the measurements of the three-phase signals (currents) in a controlled DFIG and PMSG. Although different authors have dealt with FDI for sensors in induction machines and in DFIGs, most of them rely on the machine model with constant parameters. However, the parameter uncertainties due to changes in the operating conditions will produce degradation in the performance of such FDI systems. The robust techniques to detect faults are exist but there is a need of extra sensor. This paper proposed a systematic methodology for the design of sensor FDI systems with the following characteristics: i) capable of detecting and isolating incipient additive (bias) faults, ii) robust against changes in the references/disturbances affecting the controlled DFIG and PMSG as well as modeling/parametric uncertainties, iii) residual generation system based on a multi-observer strategy to enhance the isolation process, The designed sensor FDI systems have been validated using measured voltages, as well as simulated data from a controlled DFIG. First the state space models of DFIG and PMSM explained followed by kalman filter introduction and current sensor fault detection using a bank of kalman filter named dedicated Observer Scheme and generalized Observer scheme to detect simultaneous and multiple faults was theorized and simulated using MATLAB simulation tool .The simulation results were summarized with and without Sensor fault.

R. Saravanakumar; M. Manimozhi; D.P. Kothari; M. Tejenosh

2014-01-01T23:59:59.000Z

117

NREL: Wind Research - Abundant Renewable Energy's ARE 442 Wind Turbine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Abundant Renewable Energy's ARE 442 Wind Turbine Testing and Results Abundant Renewable Energy's ARE 442 Wind Turbine Testing and Results Get the Adobe Flash Player to see this video. A video of Abundant Renewable Energy's ARE 442 wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL tested Abundant Renewable Energy's ARE 442 turbine at the National Wind Technology Center (NWTC). The ARE 442 is a 10-kilowatt (kW), three-bladed, horizontal-axis upwind small wind turbine. It has a hub height of 30.9 meters and a rotor diameter of 7.2 meters. The turbine has a single-phase permanent-magnet generator that operates at variable voltages up to 410 volts AC. Testing Summary The summary of the tests is below with the final reports.

118

NREL: Wind Research - Gaia-Wind's 11 Kilowatt Wind Turbine Testing and  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Gaia-Wind's 11 Kilowatt Wind Turbine Testing and Results Gaia-Wind's 11 Kilowatt Wind Turbine Testing and Results A video of Gaia-Wind's 11-kW wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL tested Gaia-Wind's 11-kilowatt (kW) small wind turbine at the National Wind Technology Center (NWTC). Gaia-Wind's turbine is a three-phase induction generator that operates at 480 volts. The turbine's downwind rotor has a 13-meter diameter, and its tower is 18 meters tall. The two-bladed, oversized rotor is designed for low to moderate wind speeds. Testing Summary The summary of the tests is below with the final reports. Cumulative Energy Production 6/11/2008: 210; 6/13/2008: 528; 6/16/2008: 716; 6/18/2008: 731; 6/19/2008:

119

Brilliant Wind Turbine | GE Global Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Brilliant(tm) Wind Turbines Push Power and Efficient Boundaries Brilliant(tm) Wind Turbines Push Power and Efficient Boundaries The conventional wisdom around wind is that the...

120

Brushless Doubly Fed Induction Generator Based Wind Turbine Drivetrain Under Grid Fault Conditions:.  

E-Print Network [OSTI]

??With growing interest in sustainable forms of energy, the wind industry is growing rapidly. The Doubly Fed Induction Generator is the most popular choice for… (more)

Shipurkar, U.

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Materials use in electricity generators in wind turbines – state-of-the-art and future specifications  

Science Journals Connector (OSTI)

Abstract The European Strategic Energy Technology Plan, adopted by the European Union in 2008, is a first step to establish an energy technology policy for Europe and to support the 2020 energy and climate change targets from the technology development point of view. One of its initiatives is to assess the characteristics of the materials that will be needed in order to achieve the 2020 targets, in terms both of amounts of materials and their technical specifications, along with the way to get there for the latter. The Materials Initiative was created to foster a roadmap which is based on a scientific assessment of the current situation. This paper presents the work of the author in the (wind turbine) electricity generator part of that assessment, it includes the aspects of technology and system state-of-the-art; material supply status; on-going research and players; materials specification targets for 2020/2030 and beyond. The assessment found that the performance of permanent magnets is the single item potentially to provide the most significant improvement in component specification, but that in order to achieve this perhaps new chemical components –based on rare earths, as currently, or not-will be necessary in order to achieve these high-performance magnets. The search for these new materials is stimulated by the current dependency of the world in a nearly-monopolistic supplier of rare earth elements. The assessment also concluded that the improvement of materials specifications is challenging but achievable in most areas, and a crucial aspect for the necessary cost reductions in wind energy production.

Roberto Lacal-Arántegui

2015-01-01T23:59:59.000Z

122

Airfoils for wind turbine  

DOE Patents [OSTI]

Airfoils are disclosed for the blade of a wind turbine wherein each airfoil is characterized by a thickness in a range from 16%-24% and a maximum lift coefficient designed to be largely insensitive to roughness effects. The airfoils include a family of airfoils for a blade 15 to 25 meters in length, a family of airfoils for a blade 1 to 5 meters in length, and a family of airfoils for a blade 5 to 10 meters in length. 10 figs.

Tangler, J.L.; Somers, D.M.

1996-10-08T23:59:59.000Z

123

Modelling and control of a variable speed wind turbine driving doubly fed induction generator using three-level PWM converter  

Science Journals Connector (OSTI)

The aim of this researcher is to develop a complete wind central model driven doubly fed induction generator (DFIG) which feeds an AC power grid. For that, two-pulse width modulated (PWM) voltage converters are connected back to back between the rotor terminals of DFIG and the utility grid via a common DC link, in there, our contribution will appear in the utilisation of three levels voltage inverters in order to ameliorate the energy quality. The simulation was carried out on a 2 MW wind-turbine driven DFIG system and the developed unified model validity and the proposed control strategies feasibility are all confirmed by the simulated results.

Fairouz Kendouli; Khoudir Abed; Khalil Nabti; Hocine Benalla

2012-01-01T23:59:59.000Z

124

Charlestown Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Charlestown Wind Turbine Charlestown Wind Turbine Jump to: navigation, search Name Charlestown Wind Turbine Facility Charlestown Wind Turbine Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner MWRA Developer MWRA Energy Purchaser Distributed generation - net metered Location Boston MA Coordinates 42.39094522°, -71.07094288° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.39094522,"lon":-71.07094288,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

125

NREL: Wind Research - Small Wind Turbine Webinars  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Small Wind Turbine Webinars Small Wind Turbine Webinars Here you will find webinars about small wind turbines that NREL hosted. Introducing WindLease(tm): Making Wind Energy Affordable NREL and the American Solar Energy Society (ASES) Wind Division co-hosted this webinar. (Text Version.) Date: August 1, 2013 Run Time: 40 minutes Joe Hess, VP of Business Development at United Wind, described United Wind's WindQuote and WindLease Program and explained the process from the dealer's and consumer's perspective. Texas Renewable Energy Industries Association NREL and the American Solar Energy Society (ASES) Wind Division co-hosted this webinar. (Text Version). Date: March 7, 2013 Run Time: 1 hour Russel Smith, Texas Renewable Energy Industries Association executive director and co-founder, provided an overview of the trade association

126

Passively cooled direct drive wind turbine  

DOE Patents [OSTI]

A wind turbine is provided that passively cools an electrical generator. The wind turbine includes a plurality of fins arranged peripherally around a generator house. Each of the fins being oriented at an angle greater than zero degrees to allow parallel flow of air over the fin. The fin is further tapered to allow a constant portion of the fin to extend beyond the air stream boundary layer. Turbulence initiators on the nose cone further enhance heat transfer at the fins.

Costin, Daniel P. (Chelsea, VT)

2008-03-18T23:59:59.000Z

127

Duration Test Report for the Entegrity EW50 Wind Turbine  

SciTech Connect (OSTI)

This report summarizes the results of a duration test that NREL conducted on the Entegrity EW50 wind turbine. This test was conducted in accordance with the International Electrotechnical Commissions' (IEC) standard, Wind Turbine Generator System Part 2: Design requirements for small wind turbines, IEC 61400-2 Ed.2.0, 2006-03.

Smith, J.; Huskey, A.; Jager, D.; Hur, J.

2012-12-01T23:59:59.000Z

128

Mechanisms of amplitude modulation in wind turbine , A. J. Bullmoreb  

E-Print Network [OSTI]

Mechanisms of amplitude modulation in wind turbine noise M. Smitha , A. J. Bullmoreb , M. M. Candb The environmental noise impact of wind turbine generators has to be assessed when planning new installations of installations. These instances cannot be . Figure 1: spectrogram of a sample of wind turbine noise. This paper

Paris-Sud XI, Université de

129

Influence of refraction on wind turbine noise  

E-Print Network [OSTI]

A semi-empirical method is applied to calculate the time-average sound level of wind turbine noise generation and propagation. Both are affected by wind shear refraction. Under upwind conditions the partially ensonified zone separates the fully ensonified zone (close to the turbine) and the shadow zone (far away from the turbine). Refraction is described in terms of the wind speed linear profile fitted to the power law profile. The rotating blades are treated as a two-dimensional circular source in the vertical plane. Inside the partially ensonified zone the effective A-weighted sound power decreases to zero when the receiver moves from the turbine toward the shadow zone. The presented results would be useful in practical applications to give a quick estimate of the effect of refraction on wind turbine noise.

Makarewicz, Rufin

2013-01-01T23:59:59.000Z

130

Motion of floating wind turbines.  

E-Print Network [OSTI]

?? Motion of floating wind turbines has been studied. A literature study on different concepts and what tools are available for simulating them is presented.… (more)

Linde, Břrge

2010-01-01T23:59:59.000Z

131

Aerodynamic Analysis of wind turbine.  

E-Print Network [OSTI]

??The thesis investigates the application of vortex theory for analyzing the aerodynamic loads on wind turbine blades. Based on this method, a graphical user friendly… (more)

Zarmehri, Ayyoob

2012-01-01T23:59:59.000Z

132

Non-Stationary Spectral Estimation for Wind Turbine Induction Generator Faults Detection  

E-Print Network [OSTI]

- or indirect-drive, fixed- or variable-speed turbine generators, advanced signal processing tools are required the time-varying fault characteristic frequency and the related energy. Furthermore, a decision- making was performed using advanced signal processing techniques such as demodulation techniques [8], [9] and time-frequency

Paris-Sud XI, Université de

133

Computational Aerodynamics and Aeroacoustics for Wind Turbines  

E-Print Network [OSTI]

Computational Aerodynamics and Aeroacoustics for Wind Turbines #12;#12;Computational Aerodynamics and Aeroacoustics for Wind Turbines Wen Zhong Shen Fluid Mechanics Department of Mechanical Engineering TECHNICAL Shen, Wen Zhong Computational Aerodynamics and Aeroacoustics for Wind Turbines Doctor Thesis Technical

134

Optimal site matching of wind turbine generator: Case study of the Gulf of Suez region in Egypt  

Science Journals Connector (OSTI)

During the last few years, Egypt has emerged as the leader of wind power in the Middle East and Africa. In the Gulf of Suez region, a continuously expanding large-scale grid-connected wind farm is available at Zafarana site. The Gulf of EL-Zayt site in the Gulf of Suez region is now under extensive studies related to wind power projects such as feasibility and bird migration studies. Therefore, the Gulf of Suez region is considered in this paper for optimal site matching of wind turbine generator (WTG). This paper treats the problem of site matching of WTG through improved formulation of the capacity factor. Such factor is estimated based on Weibull PDF and an accurate model for the WTG output-power-curve. Ornithological, martial, and other limitations placed on WTG hub heights in the Gulf of Suez region in Egypt are taken into account. In addition, a MATLAB based program is created to implement the presented technique of optimal site matching of WTG. Based on turbine-performance-index (TPI) maximization, optimal output-power-curve and optimal commercial WTG are determined for each candidate site in the Gulf of Suez region. Long-term performance measurements at Zafarana wind farms in comparison with the results are used to validate the presented technique and the optimality of the results.

M. EL-Shimy

2010-01-01T23:59:59.000Z

135

Neural Control of the Self-Excited Induction Generator for Variable-Speed Wind Turbine Generation  

Science Journals Connector (OSTI)

In this paper, a steady state and transient analysis of a stand alone Self Excited Induction Generator (SEIG) is presented. The conventional dynamic ... Artificial Neural Network (ANN) to model the induction generator

S. Zouggar; Y. Zidani; M. L. ELhafyani…

2012-01-01T23:59:59.000Z

136

Vertical axis wind turbine acoustics  

E-Print Network [OSTI]

Vertical Axis Wind Turbine Acoustics Charlie Pearson Corpus Christi College Cambridge University Engineering Department A thesis submitted for the degree of Doctor of Philosophy September 2013 Declaration Described in this dissertation is work... quickly to changing wind conditions, small- scale vertical axis wind turbines (VAWTs) have been proposed as an efficient solution for deployment in built up areas, where the wind is more gusty in nature. If VAWTs are erected in built up areas...

Pearson, Charlie

2014-04-08T23:59:59.000Z

137

Addressing Wind Turbine Tribological Challenges with Surface...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Addressing Wind Turbine Tribological Challenges with Surface Engineering Presented by Gary Doll of the University of Akron at the Wind Turbine Tribology Seminar 2014. Addressing...

138

Control strategies of doubly fed induction generator-based wind turbine system with new rotor current protection topology  

Science Journals Connector (OSTI)

A protection scheme of a doubly fed induction generator (DFIG) based wind turbine system during faults is crowbar activation. With this protection the rotor side converter (RSC) is temporarily disconnected and its vector control over the stator active and reactive power is lost leading to poor power quality at the point of common coupling (PCC). This paper presents a new protection scheme for transient rotor current to improve the performance of DFIG during grid disturbance. The new scheme consisting of a crowbar and series circuit is connected between the rotor windings and RSC to enhance the low voltage ride-through capability of DFIG. The proposed scheme successfully limits the transient rotor current and dc-link voltage and a disconnection of RSC from the rotor windings is avoided during fault. Additionally RSC and grid-side converter controllers are modified to improve the voltage at PCC. Simulations on matlab/Simulink verify the effectiveness of the proposed scheme.

Jackson John Justo; Kyoung-Soo Ro

2012-01-01T23:59:59.000Z

139

Small Wind Guidebook/What Size Wind Turbine Do I Need | Open Energy  

Open Energy Info (EERE)

What Size Wind Turbine Do I Need What Size Wind Turbine Do I Need < Small Wind Guidebook Jump to: navigation, search Print PDF WIND ENERGY STAKEHOLDER ENGAGEMENT & OUTREACHSmall Wind Guidebook Home WindTurbine-icon.png Small Wind Guidebook * Introduction * First, How Can I Make My Home More Energy Efficient? * Is Wind Energy Practical for Me? * What Size Wind Turbine Do I Need? * What Are the Basic Parts of a Small Wind Electric System? * What Do Wind Systems Cost? * Where Can I Find Installation and Maintenance Support? * How Much Energy Will My System Generate? * Is There Enough Wind on My Site? * How Do I Choose the Best Site for My Wind Turbine? * Can I Connect My System to the Utility Grid? * Can I Go Off-Grid? * State Information Portal * Glossary of Terms * For More Information What Size Wind Turbine Do I Need?

140

NREL: Wind Research - Utility-Scale Wind Turbine Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

wind turbine research addresses performance and reliability issues that large wind turbines experience throughout their lifespan and reduces system costs through innovative...

Note: This page contains sample records for the topic "wind turbines generate" 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

A High-Order Sliding Mode Observer for Sensorless Control ofDFIG-Based Wind Turbines  

E-Print Network [OSTI]

A High-Order Sliding Mode Observer for Sensorless Control ofDFIG-Based Wind Turbines Mohamed control of a doubly-fed induction generator (DFIG) based wind turbine. The sensorless control scheme (generator and turbine). Simulations using the wind turbine simulator FAST on a 1.5- MW three-blade wind

Boyer, Edmond

142

The Inside of a Wind Turbine | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

The Inside of a Wind Turbine The Inside of a Wind Turbine The Inside of a Wind Turbine 1 of 17 Tower: 2 of 17 Tower: Made from tubular steel (shown here), concrete, or steel lattice. Supports the structure of the turbine. Because wind speed increases with height, taller towers enable turbines to capture more energy and generate more electricity. Generator: 3 of 17 Generator: Produces 60-cycle AC electricity; it is usually an off-the-shelf induction generator. High-speed shaft: 4 of 17 High-speed shaft: Drives the generator. Nacelle: 5 of 17 Nacelle: Sits atop the tower and contains the gear box, low- and high-speed shafts, generator, controller, and brake. Some nacelles are large enough for a helicopter to land on. Wind vane: 6 of 17 Wind vane: Measures wind direction and communicates with the yaw drive to orient the

143

Small Wind Guidebook/How Do I Choose the Best Site for My Wind Turbine |  

Open Energy Info (EERE)

Small Wind Guidebook/How Do I Choose the Best Site for My Wind Turbine Small Wind Guidebook/How Do I Choose the Best Site for My Wind Turbine < Small Wind Guidebook Jump to: navigation, search Print PDF WIND ENERGY STAKEHOLDER ENGAGEMENT & OUTREACHSmall Wind Guidebook Home WindTurbine-icon.png Small Wind Guidebook * Introduction * First, How Can I Make My Home More Energy Efficient? * Is Wind Energy Practical for Me? * What Size Wind Turbine Do I Need? * What Are the Basic Parts of a Small Wind Electric System? * What Do Wind Systems Cost? * Where Can I Find Installation and Maintenance Support? * How Much Energy Will My System Generate? * Is There Enough Wind on My Site? * How Do I Choose the Best Site for My Wind Turbine? * Can I Connect My System to the Utility Grid? * Can I Go Off-Grid? * State Information Portal * Glossary of Terms

144

Installing Small Wind Turbines Seminar and Workshop  

E-Print Network [OSTI]

Seminar and Workshop Installing Small Wind Turbines Seminar and Workshop Location: Murdoch January 2011 Details for Registration and Payment: Mr Daniel Jones, National Small Wind Turbine Test: The National Small Wind Turbine Centre at Murdoch University is holding a Small Wind Turbine short training

145

Impact of DFIG wind turbines on transient stability of power systems a review  

E-Print Network [OSTI]

Impact of DFIG wind turbines on transient stability of power systems ­ a review Authors Na Abstract of wind farms are using variable speed wind turbines equipped with doubly-fed induction generators (DFIG) due to their advantages over other wind turbine generators. Therefore, the analysis of wind power

Pota, Himanshu Roy

146

Westwind Wind Turbines | Open Energy Information  

Open Energy Info (EERE)

Jump to: navigation, search Name: Westwind Wind Turbines Place: Northern Ireland, United Kingdom Zip: BT29 4TF Sector: Wind energy Product: Northern Ireland based small scale wind...

147

Parametric design of floating wind turbines  

E-Print Network [OSTI]

As the price of energy increases and wind turbine technology matures, it is evident that cost effective designs for floating wind turbines are needed. The next frontier for wind power is the ocean, yet development in near ...

Tracy, Christopher (Christopher Henry)

2007-01-01T23:59:59.000Z

148

Diffuser Augmented Wind Turbine Analysis Code  

E-Print Network [OSTI]

, it is necessary to develop innovative wind capturing devices that can produce energy in the locations where large conventional horizontal axis wind turbines (HAWTs) are too impractical to install and operate. A diffuser augmented wind turbine (DAWT) is one...

Carroll, Jonathan

2014-05-31T23:59:59.000Z

149

Offshore Series Wind Turbine Variable Hub heights & rotor diameters  

E-Print Network [OSTI]

3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also, for both on and offshore use. Special features include... As the world's first commercially available wind

Firestone, Jeremy

150

An experimental and numerical study of wind turbine seismic behavior  

E-Print Network [OSTI]

a steel 1-MW wind turbine tower. ” Engineering Structures,testing of a steel wind turbine tower. ” Proceedings of theanalysis of steel wind turbine towers in the canadian

Prowell, I.

2011-01-01T23:59:59.000Z

151

Current Challenges in Wind Turbine Tribology | Argonne National...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Current Challenges in Wind Turbine Tribology Presented by Gary Doll of the University of Akron at the Wind Turbine Tribology Seminar 2014. Tribological Challenges in Wind Turbine...

152

Darrieus vertical axis wind turbine for power generation I: Assessment of Darrieus VAWT configurations  

Science Journals Connector (OSTI)

Abstract This paper aims to assess the Darrieus vertical axis wind turbine (VAWT) configurations, including the drawbacks of each variation that hindered the development into large scale rotor. A comprehensive timeline is given as a lineage chart. The variations are assessed on the performance, components and operational reliability. In addition, current development and future prospects of Darrieus VAWT are presented. The Darrieus VAWT patented in France in 1925 and in the US in 1931 had two configurations: (i) curved blades and (ii) straight blades configurations. Curved blades configuration (egg-beater or phi-rotor) has evolved from the conventional guy-wires support into fixed-on-tower and cantilevered versions. Straight blades configuration used to have variable-geometry (Musgrove-rotor), variable-pitch (Giromill), Diamond, Delta and V/Y rotor variations. They were stopped due to low economical value, i.e. high specific cost of energy (COE). Musgrove-rotor has evolved into fixed-pitch straight-bladed H-rotor (referred as H-rotor in this paper for simplicity). H-rotor, in turn, has evolved into several variations: Articulating, Tilted and Helical H-rotors.

Willy Tjiu; Tjukup Marnoto; Sohif Mat; Mohd Hafidz Ruslan; Kamaruzzaman Sopian

2015-01-01T23:59:59.000Z

153

Wind turbine reliability :understanding and minimizing wind turbine operation and maintenance costs.  

SciTech Connect (OSTI)

Wind turbine system reliability is a critical factor in the success of a wind energy project. Poor reliability directly affects both the project's revenue stream through increased operation and maintenance (O&M) costs and reduced availability to generate power due to turbine downtime. Indirectly, the acceptance of wind-generated power by the financial and developer communities as a viable enterprise is influenced by the risk associated with the capital equipment reliability; increased risk, or at least the perception of increased risk, is generally accompanied by increased financing fees or interest rates. This paper outlines the issues relevant to wind turbine reliability for wind turbine power generation projects. The first sections describe the current state of the industry, identify the cost elements associated with wind farm O&M and availability and discuss the causes of uncertainty in estimating wind turbine component reliability. The latter sections discuss the means for reducing O&M costs and propose O&M related research and development efforts that could be pursued by the wind energy research community to reduce cost of energy.

Walford, Christopher A. (Global Energy Concepts. Kirkland, WA)

2006-03-01T23:59:59.000Z

154

Insect attraction to wind turbines: does colour play a role?  

Science Journals Connector (OSTI)

The phenomenon of wildlife mortality at wind turbine installations has been generating increasing concern, both for the continued development of the wind industry and for local ecology. While an...

C. V. Long; J. A. Flint; P. A. Lepper

2011-04-01T23:59:59.000Z

155

Lateral and Axial Capacity of Monopiles for Offshore Wind Turbines  

Science Journals Connector (OSTI)

Offshore wind has enormous worldwide potential to generate increasing ... are considered to be viable in supporting larger offshore wind turbines in shallow to medium depth waters. In ... of axial and lateral loa...

Aliasger Haiderali; Ulas Cilingir; Gopal Madabhushi

2013-09-01T23:59:59.000Z

156

Steady-state analysis of doubly fed induction generators for wind turbines using MATLAB  

Science Journals Connector (OSTI)

A wind energy conversion system (WECS) differs from a conventional power system. The power output of a conventional power plant can be controlled whereas; the power output of a WECS depends on the wind. This nature of WECS makes it difficult for analysis, design and management. Various approaches have been developed to study the behaviour of WECS. In this paper, the steady-state characteristics of a WECS using doubly fed induction generators (DFIG) are analysed using MATLAB. The dynamic steady-state simulation model of the DFIG is developed using MATLAB. Simulation analysis is performed to investigate a variety of DFIG characteristics, including torque-speed, real and reactive-power over speed characteristics. Based on the analysis, the DFIG operating characteristics are studied.

B. Baby Priya; A. Chilambuchelvan

2009-01-01T23:59:59.000Z

157

Hermetic turbine generator  

DOE Patents [OSTI]

A Rankine cycle turbine drives an electric generator and a feed pump, all on a single shaft, and all enclosed within a hermetically sealed case. The shaft is vertically oriented with the turbine exhaust directed downward and the shaft is supported on hydrodynamic fluid film bearings using the process fluid as lubricant and coolant. The selection of process fluid, type of turbine, operating speed, system power rating, and cycle state points are uniquely coordinated to achieve high turbine efficiency at the temperature levels imposed by the recovery of waste heat from the more prevalent industrial processes.

Meacher, John S. (Ballston Lake, NY); Ruscitto, David E. (Ballston Spa, NY)

1982-01-01T23:59:59.000Z

158

MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES  

E-Print Network [OSTI]

APPENDIX A MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES #12;A-1 APPENDIX A MEASURING IMPACTS TO BIRDS CAUSED BY WIND TURBINES 1.0 INTRODUCTION Differential composition of wind turbines at wind energy used is the number of fatalities per wind turbine per year (Anderson et al. 1999). This metric has

159

Siting guidelines for utility application of wind turbines. Final report  

SciTech Connect (OSTI)

Utility-oriented guidelines are described for identifying viable sites for wind turbines. Topics and procedures are also discussed that are important in carrying out a wind turbine siting program. These topics include: a description of the Department of Energy wind resource atlases; procedures for predicting wind turbine performance at potential sites; methods for analyzing wind turbine economics; procedures for estimating installation and maintenance costs; methods for anlayzing the distribution of wind resources over an area; and instrumentation for documenting wind behavior at potential sites. The procedure described is applicable to small and large utilities. Although the procedure was developed as a site-selection tool, it can also be used by a utility who wishes to estimate the potential for wind turbine penetration into its future generation mix.

Pennell, W.T.

1983-01-01T23:59:59.000Z

160

WINDExchange: Siting Wind Turbines  

Wind Powering America (EERE)

Wind Wildlife Institute (AWWI) facilitates timely and responsible development of wind energy, while protecting wildlife and wildlife habitat. AWWI was created and is sustained by...

Note: This page contains sample records for the topic "wind turbines generate" 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

Maglev Wind Turbine Technologies | Open Energy Information  

Open Energy Info (EERE)

Maglev Wind Turbine Technologies Maglev Wind Turbine Technologies Jump to: navigation, search Name Maglev Wind Turbine Technologies Place Sierra Vista, Arizona Zip 85635 Sector Wind energy Product The new company employs magnetic levitation (Maglev) technology in its wind turbines, which it says will have a longer life span, be cheaper to build, and produce 1GW of energy each. References Maglev Wind Turbine Technologies[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Maglev Wind Turbine Technologies is a company located in Sierra Vista, Arizona . References ↑ "Maglev Wind Turbine Technologies" Retrieved from "http://en.openei.org/w/index.php?title=Maglev_Wind_Turbine_Technologies&oldid=348578"

162

NREL: Wind Research - Advanced Research Turbines  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Research Turbines Two 440 foot meteorological towers are upwind of two research wind turbines. Two 600-kW Westinghouse turbines at the NWTC are used to test new control schemes...

163

An introduction to the small wind turbine project  

SciTech Connect (OSTI)

Small wind turbines are typically used for the remote or rural areas of the world including: a village in Chile; a cabin dweller in the U.S.; a farmer who wants to water his crop; or a utility company that wants to use distributed generation to help defer building new transmission lines and distribution facilities. Small wind turbines can be used for powering communities, businesses, homes, and miscellaneous equipment to support unattended operation. This paper covers the U.S. Department of Energy/National Renewable Energy Laboratory Small Wind Turbine project, its specifications, its applications, the subcontractors and their small wind turbines concepts. 4 refs., 4 figs.

Forsyth, T.L.

1997-07-01T23:59:59.000Z

164

An experimental and numerical study of wind turbine seismic behavior  

E-Print Network [OSTI]

of Seismic and Wind Load Combinations 8.5.2 Extremeextrapolation for wind turbine extreme loads. ” Wind Energy,extrapolation for wind turbine extreme loads. ” 46th AIAA

Prowell, I.

2011-01-01T23:59:59.000Z

165

Understanding Trends in Wind Turbine Prices Over the Past Decade  

E-Print Network [OSTI]

include some offshore wind turbines. That said, the factoffshore wind still accounts for a relatively small portion of Vestas’ turbine

Bolinger, Mark

2012-01-01T23:59:59.000Z

166

Novel sensorless generator control and grid fault ride-through strategies for variable-speed wind turbines and implementation on a new real-time simulation platform.  

E-Print Network [OSTI]

??The usage of MW-size variable-speed wind turbines as sources of energy has increased significantly during the last decade. Advantages over fixed-speed wind turbines include more… (more)

Yang, Sheng

2010-01-01T23:59:59.000Z

167

Building the Basic PVC Wind Turbine  

Broader source: Energy.gov (indexed) [DOE]

Energy Smart CD- Building PVC Turbine 8 Some Blade Building Tips KidWind model wind turbines are designed for use in science classes, or as a hobby or science fair project....

168

Does the infrasound from wind turbines affect the inner ear? Alec N. Salt1  

E-Print Network [OSTI]

Does the infrasound from wind turbines affect the inner ear? Alec N. Salt1 1 Washington University turbines adversely affects human health. The unweighted spectrum of wind turbine noise slowly rises (needing over 120 dB SPL to detect 2 Hz) it is claimed that infrasound generated by wind turbines is below

Salt, Alec N.

169

DEVELOPMENT OF AN ULTRASONIC NDT SYSTEM FOR AUTOMATED IN-SITU INSPECTION OF WIND TURBINE BLADES  

E-Print Network [OSTI]

of a wind turbine, including turbine blades, tower, gears, generator bearings etc. [2]. However, due to highDEVELOPMENT OF AN ULTRASONIC NDT SYSTEM FOR AUTOMATED IN- SITU INSPECTION OF WIND TURBINE BLADES Abington, Cambridge, CB21 6AL, UK bic@brunel.ac.uk ABSTRACT It is crucial to maintain wind turbine blades

Boyer, Edmond

170

Energy 101: Wind Turbines- 2014 Update  

Office of Energy Efficiency and Renewable Energy (EERE)

The video highlights the basic principles at work in wind turbines, and illustrates how the various components work to capture and convert wind energy to electricity.

171

Analysis of the effects of integrating wind turbines into a conventional utility: a case study. Final report  

SciTech Connect (OSTI)

The impact on a utility incorporating wind turbine generation due to wind speed sampling frequency, wind turbine performance model, and wind speed forecasting accuracy is examined. The utility analyzed in the study was the Los Angeles Department of Water and Power and the wind turbine assumed was the MOD-2. The sensitivity of the economic value of wind turbine generation to wind speed sampling frequency and wind turbine modeling technique is examined as well as the impact of wind forecasting accuracy on utility operation and production costs. Wind speed data from San Gorgonio Pass, California during 1979 are used to estimate wind turbine performance using four different simulation methods. (LEW)

Goldenblatt, M.K.; Wegley, H.L.; Miller, A.H.

1982-08-01T23:59:59.000Z

172

Analysis of the effects of integrating wind turbines into a conventional utility: a case study. Revised final report  

SciTech Connect (OSTI)

The impact on a utility incorporating wind turbine generation due to wind speed sampling frequency, wind turbine performance model, and wind speed forecasting accuracy is examined. The utility analyzed in this study was the Los Angeles Department of Water and Power, and the wind turbine assumed was the MOD-2. The sensitivity of the economic value of wind turbine generation to wind speed sampling frequency and wind turbine modeling technique is examined as well as the impact of wind forecasting accuracy on utility operation and production costs. Wind speed data from San Gorgonio Pass, California during 1979 are used to estimate wind turbine performance using four different simulation methods. (LEW)

Goldenblatt, M.K.; Wegley, H.L.; Miller, A.H.

1983-03-01T23:59:59.000Z

173

Failure Modes and Effects Analysis (FMEA) for wind turbines  

Science Journals Connector (OSTI)

The Failure Modes and Effects Analysis (FMEA) method has been used to study the reliability of many different power generation systems. This paper now applies that method to a wind turbine (WT) system using a proprietary software reliability analysis tool. Comparison is made between the quantitative results of an FMEA and reliability field data from real wind turbine systems and their assemblies. These results are discussed to establish relationships which are useful for future wind turbine designs. The main system studied is an existing design 2 MW wind turbine with a Doubly Fed Induction Generator (DFIG), which is then compared with a hypothetical wind turbine system using the Brushless Doubly Fed Generator (BDFG) of the same rating. The software reliability analysis tool used for these studies was Relex Reliability Studio 2007 Version 2.

H. Arabian-Hoseynabadi; H. Oraee; P.J. Tavner

2010-01-01T23:59:59.000Z

174

Electromagnetic torque analysis of a DFIG for wind turbines  

Science Journals Connector (OSTI)

Electromagnetic torque of doubly fed induction generator (DFIG) is a consequence of the rotor and stator supply. The stator voltage has a fixed amount and frequency. The rotor voltage of the DFIG as a part of a wind turbine has a variable amount and ... Keywords: DFIG, electromagnetic torque, renewable energy, wind turbine

Jurica Smajo; Dinko Vukadinovic

2008-05-01T23:59:59.000Z

175

Prototype bucket foundation for wind turbines  

E-Print Network [OSTI]

Prototype bucket foundation for wind turbines -natural frequency estimation Lars Bo Ibsen Morten bucket foundation for wind turbines -natural frequency estimation by Lars Bo Ibsen Morten Liingaard foundation for wind turbines--natural frequency estimation" is divided into four numbered sections

176

Wind Turbine Blockset in Matlab/Simulink  

E-Print Network [OSTI]

Wind Turbine Blockset in Matlab/Simulink General Overview and Description of the Models Florin Iov, Anca Daniela Hansen, Poul Sørensen, Frede Blaabjerg Aalborg University March 2004 #12;22 Wind Turbine to model, optimize and design wind turbines" and it has been used as a general developer tool for other

177

Wind turbine reliability : understanding and minimizing wind turbine operation and maintenance costs.  

SciTech Connect (OSTI)

Wind turbine system reliability is a critical factor in the success of a wind energy project. Poor reliability directly affects both the project's revenue stream through increased operation and maintenance (O&M) costs and reduced availability to generate power due to turbine downtime. Indirectly, the acceptance of wind-generated power by the financial and developer communities as a viable enterprise is influenced by the risk associated with the capital equipment reliability; increased risk, or at least the perception of increased risk, is generally accompanied by increased financing fees or interest rates. Cost of energy (COE) is a key project evaluation metric, both in commercial applications and in the U.S. federal wind energy program. To reflect this commercial reality, the wind energy research community has adopted COE as a decision-making and technology evaluation metric. The COE metric accounts for the effects of reliability through levelized replacement cost and unscheduled maintenance cost parameters. However, unlike the other cost contributors, such as initial capital investment and scheduled maintenance and operating expenses, costs associated with component failures are necessarily speculative. They are based on assumptions about the reliability of components that in many cases have not been operated for a complete life cycle. Due to the logistical and practical difficulty of replacing major components in a wind turbine, unanticipated failures (especially serial failures) can have a large impact on the economics of a project. The uncertainty associated with long-term component reliability has direct bearing on the confidence level associated with COE projections. In addition, wind turbine technology is evolving. New materials and designs are being incorporated in contemporary wind turbines with the ultimate goal of reducing weight, controlling loads, and improving energy capture. While the goal of these innovations is reduction in the COE, there is a potential impact on reliability whenever new technologies are introduced. While some of these innovations may ultimately improve reliability, in the short term, the technology risks and the perception of risk will increase. The COE metric used by researchers to evaluate technologies does not address this issue. This paper outlines the issues relevant to wind turbine reliability for wind turbine power generation projects. The first sections describe the current state of the industry, identify the cost elements associated with wind farm O&M and availability and discuss the causes of uncertainty in estimating wind turbine component reliability. The latter sections discuss the means for reducing O&M costs and propose O&M related research and development efforts that could be pursued by the wind energy research community to reduce COE.

Not Available

2004-11-01T23:59:59.000Z

178

Study of Linear Equivalent Circuits of Electromechanical Systems for Turbine Generator Units.  

E-Print Network [OSTI]

??The thesis utilizes the analogy in dynamic equations between a mechanical and an electrical system to convert the steam-turbine, micro-turbine, wind-turbine and hydro-turbine generator mechanical… (more)

Tsai, Chia-Chun

2012-01-01T23:59:59.000Z

179

Reliability analysis of wind turbine at high uncertain wind;.  

E-Print Network [OSTI]

??Wind energy plays a vital role in the renewable energy scenario of newlinethe world The wind turbine systems have complex components which are newlinerepairable The… (more)

Sunder selwyn T

2014-01-01T23:59:59.000Z

180

Set-point reconfiguration approach for the FTC of wind turbines  

E-Print Network [OSTI]

Set-point reconfiguration approach for the FTC of wind turbines B. Boussaid C. Aubrun N system stability. The effectiveness of the proposed solution is illustrated by a wind turbine example issue. Nowadays, wind turbines which generate electrical energy from the wind energy are considered one

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "wind turbines generate" 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

Hilbert Transform-Based Bearing Failure Detection in DFIG-Based Wind Turbines  

E-Print Network [OSTI]

Hilbert Transform-Based Bearing Failure Detection in DFIG-Based Wind Turbines Yassine Amirat1 and proactive maintenance of wind turbines assumes more importance with the increasing number of installed wind current sensors installed within the wind turbine generator. This paper describes then an approach based

Boyer, Edmond

182

NREL: Wind Research - Entegrity Wind Systems's EW50 Turbine Testing and  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Entegrity Wind Systems's EW50 Turbine Testing and Results Entegrity Wind Systems's EW50 Turbine Testing and Results Entegrity Wind Systems' EW50 wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL tested Entegrity Wind Systems' EW50 turbine at the National Wind Technology Center (NWTC). The EW50 is a 50-kilowatt (kW), three-bladed, horizontal-axis downwind small wind turbine. The turbine's rotor diameter is 15 meters, and its hub height is 30.5 meters. It has a three-phase induction generator that operates at 480 volts AC. Testing Summary The summary of the tests is listed below, along with the final reports. Cumulative Energy Production 3/11/2009: 17; 3/12/2009: 17; 3/13/2009: 17; 3/14/2009: 17; 3/15/2009: 17;

183

Dynamic Models for Wind Turbines and Wind Power Plants  

SciTech Connect (OSTI)

The primary objective of this report was to develop universal manufacturer-independent wind turbine and wind power plant models that can be shared, used, and improved without any restrictions by project developers, manufacturers, and engineers. Manufacturer-specific models of wind turbines are favored for use in wind power interconnection studies. While they are detailed and accurate, their usages are limited to the terms of the non-disclosure agreement, thus stifling model sharing. The primary objective of the work proposed is to develop universal manufacturer-independent wind power plant models that can be shared, used, and improved without any restrictions by project developers, manufacturers, and engineers. Each of these models includes representations of general turbine aerodynamics, the mechanical drive-train, and the electrical characteristics of the generator and converter, as well as the control systems typically used. To determine how realistic model performance is, the performance of one of the models (doubly-fed induction generator model) has been validated using real-world wind power plant data. This work also documents selected applications of these models.

Singh, M.; Santoso, S.

2011-10-01T23:59:59.000Z

184

Market penetration of wind turbine concepts over the years Anca D. Hansen1  

E-Print Network [OSTI]

speed wind turbine concept with partial-scale power converter (DFIG) This configuration denotes the variable speed controlled wind turbine with doubly fed induction generator (DFIG) and pitch control

185

Midsize Wind Turbines for the U.S. Community Wind Market | Department...  

Broader source: Energy.gov (indexed) [DOE]

Midsize Wind Turbines for the U.S. Community Wind Market Midsize Wind Turbines for the U.S. Community Wind Market Midsize Wind Turbines for the U.S. Community Wind Market More...

186

Stakeholder Engagement and Outreach: Siting Wind Turbines  

Wind Powering America (EERE)

Resources & Tools Resources & Tools Siting Wind Turbines Wind Powering America works to increase deployment of wind energy. This page provides resources about wind turbine siting. American Wind Wildlife Institute The American Wind Wildlife Institute (AWWI) facilitates timely and responsible development of wind energy, while protecting wildlife and wildlife habitat. AWWI was created and is sustained by a unique collaboration of environmentalists, conservationists, state wildlife agencies, and wind industry leaders. Its purpose is to help lay the scientific groundwork and best practices for wind farm siting and operations, through targeted initiatives: wind-wildlife research, landscape assessment, mitigation, and education. Ordinances Regulating Development of Commercial Wind Energy Facilities

187

Advanced controls for floating wind turbines  

E-Print Network [OSTI]

Floating Offshore Wind Turbines (FOWT) is a technology that stands to spearhead the rapid growth of the offshore wind energy sector and allow the exploration of vast high quality wind resources over coastal and offshore ...

Casanovas, Carlos (Casanovas Bermejo)

2014-01-01T23:59:59.000Z

188

Utility-Scale Wind Turbines | Open Energy Information  

Open Energy Info (EERE)

Utility-Scale Wind Turbines Jump to: navigation, search Field testing of a wind turbine drivetraintower damper using advanced design and validation techniques at the National Wind...

189

The Federal Advanced Wind Turbine Program  

SciTech Connect (OSTI)

The development of technologically advanced, higher efficiency wind turbines has been identified as a high priority activity by the US wind industry. The Department of Energy's Wind Energy Program has begun a multi-year development program aimed at assisting the wind industry with the design, development, and testing of advanced wind turbine systems that can compete with conventional electric generation for $0.05/kWh at 13 mph sites by the mid-1990s and with fossil-fuel-based generators for $0.04/kWh at 13 mph sites by the year 2000. The development plan consists of four phases: (1) Conceptual Design Studies; (2) Near-Term Product Development; (3) Next Generation Technology Integration and Design, and (4) Next- Generation Technology Development and Testing. The Conceptual Design Studies were begun in late 1990, and are scheduled for completion in the Spring of 1992. Preliminary results from these analyses are very promising and indicate that the goals stated above are technically feasible. This paper includes a brief summary of the Conceptual Design Studies and presents initial plans for the follow-on activities. 3 refs., 4 figs.

Hock, S M; Thresher, R W [National Renewable Energy Lab., Golden, CO (United States); Goldman, P R [USDOE, Washington, DC (United States)

1991-12-01T23:59:59.000Z

190

The Federal Advanced Wind Turbine Program  

SciTech Connect (OSTI)

The development of technologically advanced, higher efficiency wind turbines has been identified as a high priority activity by the US wind industry. The Department of Energy`s Wind Energy Program has begun a multi-year development program aimed at assisting the wind industry with the design, development, and testing of advanced wind turbine systems that can compete with conventional electric generation for $0.05/kWh at 13 mph sites by the mid-1990s and with fossil-fuel-based generators for $0.04/kWh at 13 mph sites by the year 2000. The development plan consists of four phases: (1) Conceptual Design Studies; (2) Near-Term Product Development; (3) Next Generation Technology Integration and Design, and (4) Next- Generation Technology Development and Testing. The Conceptual Design Studies were begun in late 1990, and are scheduled for completion in the Spring of 1992. Preliminary results from these analyses are very promising and indicate that the goals stated above are technically feasible. This paper includes a brief summary of the Conceptual Design Studies and presents initial plans for the follow-on activities. 3 refs., 4 figs.

Hock, S.M.; Thresher, R.W. [National Renewable Energy Lab., Golden, CO (United States); Goldman, P.R. [USDOE, Washington, DC (United States)

1991-12-01T23:59:59.000Z

191

How Does a Wind Turbine Work? | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Work? How Does a Wind Turbine Work? How does a wind turbine work? Previous Next Wind turbines operate on a simple principle. The energy in the wind turns two or three...

192

Computational Analysis of Shrouded Wind Turbine Configurations  

E-Print Network [OSTI]

Computational Analysis of Shrouded Wind Turbine Configurations Aniket C. Aranake Vinod K. Lakshminarayan Karthik Duraisamy Computational analysis of diuser-augmented turbines is performed using high-dimensional simulations of shrouded wind turbines are performed for selected shroud geometries. The results are compared

Alonso, Juan J.

193

DOE/NREL Advanced Wind Turbine Development Program  

SciTech Connect (OSTI)

The development of technologically advanced, high-efficiency wind turbines continues to be a high-priority activity of the US wind industry. The National Renewable Energy Laboratory (formerly the Solar Energy Research Institute), sponsored by the US Department of Energy (DOE), has initiated the Advanced Wind Turbine Program to assist the wind industry in the development of a new class of advanced wind turbines. The initial phase of the program focused on developing conceptual designs for near-term and advanced turbines. The goal of the second phase of this program is to use the experience gained over the last decade of turbine design and operation combined with the latest existing design tools to develop a turbine that will produce energy at $0.05 per kilowatt-hour (kWh) in a 5.8-m/s (13-mph) wind site. Three contracts have been awarded, and two more are under negotiation in the second phase. The third phase of the program will use new innovations and state-of-the-art wind turbine design technology to produce a turbine that will generate energy at $0.04/kWh in a 5.8-m/s wind site. Details of the third phase will be announced in early 1993.

Butterfield, C.P.; Smith, B.; Laxson, A.; Thresher, B. [National Renewable Energy Lab., Golden, CO (United States)] [National Renewable Energy Lab., Golden, CO (United States); Goldman, P. [USDOE Assistant Secretary for Conservation and Renewable Energy, Washington, DC (United States). Wind/Hydro/Ocean Technologies Div.] [USDOE Assistant Secretary for Conservation and Renewable Energy, Washington, DC (United States). Wind/Hydro/Ocean Technologies Div.

1993-05-01T23:59:59.000Z

194

On the Fatigue Analysis of Wind Turbines  

SciTech Connect (OSTI)

Modern wind turbines are fatigue critical machines that are typically used to produce electrical power from the wind. Operational experiences with these large rotating machines indicated that their components (primarily blades and blade joints) were failing at unexpectedly high rates, which led the wind turbine community to develop fatigue analysis capabilities for wind turbines. Our ability to analyze the fatigue behavior of wind turbine components has matured to the point that the prediction of service lifetime is becoming an essential part of the design process. In this review paper, I summarize the technology and describe the ''best practices'' for the fatigue analysis of a wind turbine component. The paper focuses on U.S. technology, but cites European references that provide important insights into the fatigue analysis of wind turbines.

Sutherland, Herbert J.

1999-06-01T23:59:59.000Z

195

Wind Turbine Manufacturing Process Monitoring  

SciTech Connect (OSTI)

To develop a practical inline inspection that could be used in combination with automated composite material placement equipment to economically manufacture high performance and reliable carbon composite wind turbine blade spar caps. The approach technical feasibility and cost benefit will be assessed to provide a solid basis for further development and implementation in the wind turbine industry. The program is focused on the following technology development: (1) Develop in-line monitoring methods, using optical metrology and ultrasound inspection, and perform a demonstration in the lab. This includes development of the approach and performing appropriate demonstration in the lab; (2) Develop methods to predict composite strength reduction due to defects; and (3) Develop process models to predict defects from leading indicators found in the uncured composites.

Waseem Faidi; Chris Nafis; Shatil Sinha; Chandra Yerramalli; Anthony Waas; Suresh Advani; John Gangloff; Pavel Simacek

2012-04-26T23:59:59.000Z

196

Wind Turbines for Marine Propulsion  

Science Journals Connector (OSTI)

ABSTRACT The design and construction of an horizontal axis wind turbine drive for a small yacht is described. This system has been designed to test the performance of this novel type of propulsion for use in commercial shipping, the fisheries industry and for the recreational market. The use of wind turbines to harness the power available from the wind for propulsion purposes offers a number of distinct advantages over other wind propulsion systems. Propulsion is achieved in all directions of travel relative to the wind. Complete control of the system can be arranged from a remote control position such as the ships bridge. This control can be achieved with a small crew because of the opportunities for applying powered and automated control systems. The way in which each of these features is achieved, together with details of the rotor, shafting and gear-train arrangements are described here. An indication is given of the theoretical performance of the yacht under this form of propulsion.

N. Bose; R.C. McGregor

1984-01-01T23:59:59.000Z

197

Vertical axis wind turbine with continuous blade angle adjustment  

E-Print Network [OSTI]

The author presents a concept for a vertical axis wind turbine that utilizes each blade's entire rotational cycle for power generation. Each blade has its own vertical axis of rotation and is constrained to rotate at the ...

Weiss, Samuel Bruce

2010-01-01T23:59:59.000Z

198

Performance of propeller wind turbines  

SciTech Connect (OSTI)

Presented herein is a parametric study of the performance of propeller wind turbines with realistic drag/lift ratios. Calculations were made using the complete Glauert vortex blade element theory in annular streamtube elements with the complete turbine performance being the sum of the elemental results up to a specified tip speed ratio. The objective here is to exhibit a new computational technique which yields performance directly when tangential speed ratio and section aerodynamic characteristics are specified. It was found that for a tip speed ratio of 4, turbines with drag/lift ratios of 0.00 and 0.01 had power coefficients of 0.575 and 0.55, respectively. The off-design performance of the finite drag/lift was far better than that of their zero drag counterparts, except in a + or - 20% region about the design conditions. Tolerance to off-design operation increased with decreasing tip speed ratios so that the annual energy capture for tip speed ratios between 2 and 4 was about 87% of the ideal turbine value. The results are intended to provide a basis for re-evaluation of the power range classes of fixed pitch turbines and design tip speed ratios.

Wortman, A.

1983-11-01T23:59:59.000Z

199

Backstepping control of DFIG generators for wide-range variable-speed wind turbines  

Science Journals Connector (OSTI)

In this paper, we have presented a general study of self excited induction generator used in isolated renewable energy conversion source. Tthe behaviour of generated voltage under variable load, rotor speed and excitation capacitance is presented. Also, we have proposed a robust controller suitable in order to control the terminal DC voltage under different speed and AC load conditions for supplied an isolated DC load. The experimental characteristic curve of the generator and simulation result of proposed control scheme are presented.

Badre Bossoufi; Mohammed Karim; Ahmed Lagrioui; Mohammed Taoussi; Mohamed Larbi ElHafyani

2014-01-01T23:59:59.000Z

200

Offshore Wind Turbine Wakes Measured by Sodar  

Science Journals Connector (OSTI)

A ship-mounted sodar was used to measure wind turbine wakes in an offshore wind farm in Denmark. The wake magnitude and vertical extent were determined by measuring the wind speed profile behind an operating turbine, then shutting down the ...

R. J. Barthelmie; L. Folkerts; F. T. Ormel; P. Sanderhoff; P. J. Eecen; O. Stobbe; N. M. Nielsen

2003-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Globally competitive variable-speed wind turbines  

SciTech Connect (OSTI)

This paper focuses on the design issues which must be addressed if variable-speed wind turbines are to compete in the global marketplace. The paper examines how component-specific design decisions must be made on a system level if an optimized system is to be the result. The relationships among the blades, the generator and the utility interface are considered in detail, using the conceptual design of a 12 kW variable-speed wind turbine (the AOC 8/12) as a running example. The turbine is based on a direct-drive variable-reluctance generator (VRG), a single- or three-phase utility interface as appropriate, and a three-bladed rotor with fixed pitch. A preliminary turbine specification is provided, along with candidate power-speed curves and annual energy output. This paper documents the continuing development and commercialization of this technology which is being taken from the proof-of-concept stage and is now headed for field testing.

Torrey, D.A. [Rensselaer Polytechnic Institute, Troy, NY (United States); Childs, S.E.; Johnson, B.; Carter, J. [Atlantic Orient Corp., Norwich, VT (United States)

1995-12-31T23:59:59.000Z

202

Simulation for Wind Turbine Generators -- With FAST and MATLAB-Simulink Modules  

SciTech Connect (OSTI)

This report presents the work done to develop generator and gearbox models in the Matrix Laboratory (MATLAB) environment and couple them to the National Renewable Energy Laboratory's Fatigue, Aerodynamics, Structures, and Turbulence (FAST) program. The goal of this project was to interface the superior aerodynamic and mechanical models of FAST to the excellent electrical generator models found in various Simulink libraries and applications. The scope was limited to Type 1, Type 2, and Type 3 generators and fairly basic gear-train models. Future work will include models of Type 4 generators and more-advanced gear-train models with increased degrees of freedom. As described in this study, implementation of the developed drivetrain model enables the software tool to be used in many ways. Several case studies are presented as examples of the many types of studies that can be performed using this tool.

Singh, M.; Muljadi, E.; Jonkman, J.; Gevorgian, V.; Girsang, I.; Dhupia, J.

2014-04-01T23:59:59.000Z

203

ORIGINAL PAPER Insect attraction to wind turbines: does colour play a role?  

E-Print Network [OSTI]

ORIGINAL PAPER Insect attraction to wind turbines: does colour play a role? C. V. Long & J. A at wind turbine installations has been generating increasing con- cern, both for the continued development the phenomenon of avian and bat mortality at wind turbine installations, an issue that could potentially

Paris-Sud XI, Université de

204

Low-Voltage Ride-Through Techniques for DFIG-Based Wind Turbines  

E-Print Network [OSTI]

Low-Voltage Ride-Through Techniques for DFIG-Based Wind Turbines: State-of-the-Art Review deals with low-voltage ride-through (LVRT) capability of wind turbines (WTs) and in particular those as to index some emerging solutions. Index Terms--Wind turbine, doubly-fed induction generator, low voltage

Paris-Sud XI, Université de

205

Bearing Fault Detection in DFIG-Based Wind Turbines Using the First Intrinsic Mode Function  

E-Print Network [OSTI]

Bearing Fault Detection in DFIG-Based Wind Turbines Using the First Intrinsic Mode Function Y for bearing fault detection in DFIG-based wind turbines. The proposed method uses the first Intrinsic Mode Terms--Wind turbine, Doubly Fed Induction Generator (DFIG), fault detection, bearings, signal processing

Boyer, Edmond

206

High-Order Sliding Mode Control of a DFIG-Based Wind Turbine  

E-Print Network [OSTI]

High-Order Sliding Mode Control of a DFIG-Based Wind Turbine for Power Maximization and Grid Fault have several advantages over the traditional wind turbine operating methods, such as the reduction = Doubly-Fed Induction Generator; WT = Wind Turbine; HOSM = High-Order Sliding Mode; MPPT = Maximum Power

Paris-Sud XI, Université de

207

Offshore Wind Turbines Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine Addendum 2  

SciTech Connect (OSTI)

Additional modeling for offshore wind turbines, for proposed floating wind platforms to be deployed by University of Maine/DeepCwind.

Aker, Pamela M.; Jones, Anthony M.; Copping, Andrea E.

2011-03-01T23:59:59.000Z

208

Structural Analyses of Wind Turbine Tower for 3 kW Horizontal Axis Wind Turbine.  

E-Print Network [OSTI]

?? Structure analyses of a steel tower for Cal Poly's 3 kW small wind turbine is presented. First, some general design aspects of the wind… (more)

Gwon, Tae gyun (Tom)

2011-01-01T23:59:59.000Z

209

Stakeholder Engagement and Outreach: Wind Turbine Ordinances  

Wind Powering America (EERE)

Information Information Resources Printable Version Bookmark and Share Publications Success Stories Webinars Podcasts Videos Stakeholder Interviews Lessons Learned Wind Working Groups Economic Impact Studies Wind Turbine Ordinances Wind Turbine Ordinances This page lists 135 state and local wind turbine ordinances. State and local governments and policymakers can use this collection of example wind turbine ordinances when drafting a new wind energy ordinance in a town or county without existing ordinances. Due to increasing energy demands in the United States and more installed wind projects, rural communities and local governments with limited or no experience with wind energy now have the opportunity to become involved in this industry. Communities with good wind resources may be approached by

210

Aeroelastic simulation of wind turbine blades  

Science Journals Connector (OSTI)

The aim of this chapter is to compute dynamic stresses acting on wind turbine blades. These stresses are essential in predicting fatigue of the rotor.

Z.L. Mahri; M.S. Rouabah; Z. Said

2009-01-01T23:59:59.000Z

211

Robotic Wind Turbine Inspection | GE Global Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Trials GE Global Research is advancing technology that will make the inspection of wind turbines faster and more reliable for customers. Currently, an inspector examines the...

212

Dynamic Response of Floating Wind Turbines.  

E-Print Network [OSTI]

?? In this thesis the extreme values of tension in the mooring lines on Hywind Demo is investigated. Hywind Demo is a floating wind turbine… (more)

Neuenkirchen Godř, Sjur

2013-01-01T23:59:59.000Z

213

Aeroelastic analysis of an offshore wind turbine.  

E-Print Network [OSTI]

?? Aeroelastic design and fatigue analysis of large utility-scale wind turbine blades are performed. The applied fatigue model is based on established methods and is… (more)

Fossum, Peter Kalsaas

2012-01-01T23:59:59.000Z

214

Sandia National Laboratories: wind turbine blade materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Doppler Velocimeter EC Top Publications A Comparison of Platform Options for Deep-water Floating Offshore Vertical Axis Wind Turbines: An Initial Study Nonlinear Time-Domain...

215

Sandia National Laboratories: wind turbine blade reliability  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Doppler Velocimeter EC Top Publications A Comparison of Platform Options for Deep-water Floating Offshore Vertical Axis Wind Turbines: An Initial Study Nonlinear Time-Domain...

216

Structural reliability of offshore wind turbines.  

E-Print Network [OSTI]

??Statistical extrapolation is required to predict extreme loads, associated with a target return period, for offshore wind turbines. In statistical extrapolation, “short-term" distributions of the… (more)

Agarwal, Puneet, 1977-

2012-01-01T23:59:59.000Z

217

2.10 - Electrical Parts of Wind Turbines  

Science Journals Connector (OSTI)

Abstract This section presents the electrical subsystem of a wind turbine. Specifically, the power control, the generator, the power electronics, the grid connection, and the lightning protection modules are discussed. Though the content is targeted to present-day megawatt turbine, small machines are shortly presented. A list of the most important manufacturers in the field is also included. Finally, future outlook is described.

G.S. Stavrakakis

2012-01-01T23:59:59.000Z

218

Dynamic analysis of a 5 megawatt offshore floating wind turbine  

E-Print Network [OSTI]

1985. 23. Hau, E. Wind Turbines: Fundamentals, Technologies,for Floating Offshore Wind Turbines. Tech. no. NREL/CP-500-Full-scale Floating Wind Turbine." Statoil, 14 Oct. 2009.

Harriger, Evan Michael

2011-01-01T23:59:59.000Z

219

Impacts of Wind Turbine Proximity on Property Values in Massachusetts  

E-Print Network [OSTI]

of Industrial Wind Turbine Noise on Sleep and Health.Waye, K. P. (2007) Wind Turbine Noise, Annoyance and Self-and Annoyance of Wind Turbine Noise. Acta Acus- tica United

Atkinson-Palombo, Carol

2014-01-01T23:59:59.000Z

220

Dynamic analysis of a 5 megawatt offshore floating wind turbine  

E-Print Network [OSTI]

5-MW Reference Wind Turbine for Offshore System Development.for Floating Offshore Wind Turbines. Tech. no. NREL/CP-500-a Spar-type Floating Offshore Wind Turbine. Thesis. TU Delft

Harriger, Evan Michael

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Sandia National Laboratories: New Wind Turbine Blade Design  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ClimateECEnergyNew Wind Turbine Blade Design New Wind Turbine Blade Design More Energy with Less Weight ATLAS II Data Acquisition System New Wind Turbine Blade Design On May 18,...

222

Dynamic analysis of a 5 megawatt offshore floating wind turbine  

E-Print Network [OSTI]

wind turbine. Rating Control Rotor Radius Rated Wind Speed Towerwind turbine is used in this design, however there are slight modifications of the tower.of the tower. Figure 2.3: NREL 5 MW Reference Wind Turbine [

Harriger, Evan Michael

2011-01-01T23:59:59.000Z

223

Wind Turbine Transportation in Toyland | GE Global Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Edison's Desk > Wind Turbine Transportation in Toyland Wind Turbine Transportation in Toyland Charles (Burt) Theurer 2011.05.27 GE doesn't just make wind turbines. We also deliver...

224

How Does a Wind Turbine Work?  

Broader source: Energy.gov [DOE]

Wind turbines operate on a simple principle. This animation shows how energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which...

225

Novel fuzzy logic based sensorless maximum power point tracking strategy for wind turbine systems driven DFIG (doubly-fed induction generator)  

Science Journals Connector (OSTI)

Abstract This paper presents a novel FLC MPPT (fuzzy logic sensorless maximum power point tracking) method for WECS (wind energy conversion systems). The proposed method greatly reduces the speed variation range of the wind generator which leads to the downsizing the PWM (pulse width modulation) back-to-back converters by approximately 40% in comparison with conventional techniques. The method also increases the system's reliability by reducing the converter losses. Firstly, a MRAS (model reference adaptive system) based on fuzzy logic technique is used to estimate the DFIG (doubly-fed induction generator) rotor's speed. Then, a FLC MPPT (Fuzzy Logic Maximum Power Point Tracking) method is applied to provide the reference electromagnetic torque. Subsequently, in order to achieve the overall sensorless MPPT technique, the wind power is approximated from estimated generator speed and the reference of electromagnetic torque. Finally, the wind speed is estimated from the mechanical power using a fuzzy logic technique. The proposed control method has been applied to a WTG (wind turbine generator) driving a 3.7 kW DFIG in variable speed mode. In order to validate the simulation results, experimental tests have been performed on a 3.7 kW test bench, consisting of a DFIG and DC motor drive.

K. Belmokhtar; M.L. Doumbia; K. Agbossou

2014-01-01T23:59:59.000Z

226

NREL: Wind Research - Small and Distributed Wind Turbine Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

research is to increase consumer confidence in and the number of certified small wind turbines on the market through certification testing, to improve performance, and to reduce...

227

Turbine-generator replacement study  

SciTech Connect (OSTI)

This paper describes an engineering study for the replacement of a nominal 70 Mw turbine-generator in a multi-unit utility cogeneration station. The existing plant is briefly described, alternatives considered are discussed, and the conclusions reached are presented. Key topics are the turbine steam cycle evaluation and the turbine pedestal analysis.

Miller, E.F.; Stuhrke, S.P., Shah, A.A. (Burns and Roe Enterprises, Inc., Oradell, NJ (USA))

1988-01-01T23:59:59.000Z

228

Sensitivity analysis of offshore wind turbine tower caused by the external force  

Science Journals Connector (OSTI)

Generally, faster wind speeds are observed in coastal areas than ... inland areas. Therefore, for the development of offshore wind energy, more electricity is expected to be generated using wind turbines. This al...

Namhyeong Kim; Jung Woon Jin

2013-07-01T23:59:59.000Z

229

Analysis and Optimisation of a Novel Wind Turbine .  

E-Print Network [OSTI]

??The technologies of urban wind turbines have been rapidly developed in recent years, but urban wind turbines have not found a wide application due to… (more)

Zhang, Xu

2014-01-01T23:59:59.000Z

230

EA-2004: Seneca Nation of Indians Wind Turbine Project, Cattaraugus...  

Office of Environmental Management (EM)

of Indians Wind Turbine Project, Cattaraugus Territory, Chautauqua County, Irving, New York EA-2004: Seneca Nation of Indians Wind Turbine Project, Cattaraugus Territory,...

231

GE, Sandia National Lab Improve Wind Turbines | GE Global Research  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

GE, Sandia National Lab Discover Pathway to Quieter, More Productive Wind Turbines GE, Sandia National Lab Discover Pathway to Quieter, More Productive Wind Turbines Use of...

232

EA-2004: Seneca Nation of Indians Wind Turbine Project, Cattaraugus...  

Energy Savers [EERE]

EA-2004: Seneca Nation of Indians Wind Turbine Project, Cattaraugus Territory, New York EA-2004: Seneca Nation of Indians Wind Turbine Project, Cattaraugus Territory, New York...

233

SMART Wind Turbine Rotor: Design and Field Test | Department...  

Energy Savers [EERE]

Design and Field Test SMART Wind Turbine Rotor: Design and Field Test This report documents the design, fabrication, and testing of the SMART Wind Turbine Rotor. This work...

234

Aerodynamic interference between two Darrieus wind turbines  

SciTech Connect (OSTI)

The effect of aerodynamic interference on the performance of two curved bladed Darrieus-type vertical axis wind turbines has been calculated using a vortex/lifting line aerodynamic model. The turbines have a tower-to-tower separation distance of 1.5 turbine diameters, with the line of turbine centers varying with respect to the ambient wind direction. The effects of freestream turbulence were neglected. For the cases examined, the calculations showed that the downwind turbine power decrement (1) was significant only when the line of turbine centers was coincident with the ambient wind direction, (2) increased with increasing tipspeed ratio, and (3) is due more to induced flow angularities downstream than to speed deficits near the downstream turbine.

Schatzle, P.R.; Klimas, P.C.; Spahr, H.R.

1981-04-01T23:59:59.000Z

235

Luther College Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Luther College Wind Turbine Luther College Wind Turbine Jump to: navigation, search Name Luther College Wind Turbine Facility Luther College Wind Turbine Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Luther College Wind Energy Project LLC Developer Luther College Energy Purchaser Alliant Energy Location Decorah IA Coordinates 43.30919891°, -91.81617737° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.30919891,"lon":-91.81617737,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

236

Small Wind Turbine Certifications Signal Maturing Industry  

Broader source: Energy.gov [DOE]

More than a dozen small wind turbine models have received certification to the U.S. industry standard from accredited certification bodies. This progress signals a maturing industry and that the DOE Wind Program is on track to reach its goal of certifying 40 turbine models by 2020.

237

Offshore Wind Turbines: Some Technical Challenges  

E-Print Network [OSTI]

1 Offshore Wind Turbines: Some Technical Challenges Prof. Guy Houlsby FREng Oxford University House engineers concerned with installation of offshore wind turbines. The author is Professor of Civil of foundations for offshore structures. He also has a strong interest in the development of the fundamental

Houlsby, Guy T.

238

Modeling, analysis and comparison of TSR and OTC methods for MPPT and power smoothing in permanent magnet synchronous generator-based wind turbines  

Science Journals Connector (OSTI)

Abstract This paper presents a small signal modeling of a direct-driven permanent magnet synchronous generator (PMSG) based on wind turbine which is connected to the grid via back-to-back converters. The proposed small signal model includes two maximum power point tracking (MPPT) controllers: tip speed ratio (TSR) control and optimal torque control (OTC). These methods are analytically compared to illustrate MPPT and power smoothing capability. Then, to compare the MPPT and power smoothing operation of the mentioned methods, simulations are performed in MATLAB/Simulink software. From the simulation results, OTC is highly efficient in power smoothing enhancement and has clearly good performance to extract maximum power from wind; however, TSR control has definitely fast responses to wind speed variations with the expense of higher fluctuations due to its non-minimum phase characteristic.

M. Nasiri; J. Milimonfared; S.H. Fathi

2014-01-01T23:59:59.000Z

239

Anticipatory control of turbine generators  

E-Print Network [OSTI]

of Turbine Generators. (Nay 1971) Freddie Laurel Nessec, B. S. E. E, , Texas Tech University; Directed by: Professor J. S . Denison An investigation is made of the use of predicted loads in controlling turbine generators. A perturbation model of a turbine... generator is presented along with typical parameter values. A study is made of the effects of applying control action before a load change occurs. Two predictive control schemes are investi- gated using a load cycle which incorporates both ramp and step...

Messec, Freddie Laurel

1971-01-01T23:59:59.000Z

240

Optimization of wind turbine energy and power factor with an evolutionary computation algorithm  

E-Print Network [OSTI]

Optimization of wind turbine energy and power factor with an evolutionary computation algorithm the energy capture from the wind and enhance the quality of the power produced by the wind turbine, and harmonic distortion. As the generation of wind energy on an industrial scale is relatively new, the area

Kusiak, Andrew

Note: This page contains sample records for the topic "wind turbines generate" 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

Dispersal of measured sound power levels for wind turbines  

Science Journals Connector (OSTI)

The standard IEC 61400?11 provides guidance in the measurement analysis and reporting of acoustic emissions(sound power levels) from wind turbine generator systems. The application of this standard aims to provide accurate results that can be replicated by others. We did several measurement operations according to this standard on various wind farms fitted with many turbine manufacturers on different ground types. Important differences have been noticed with equal working conditions between the most and the less noisy wind turbine on a single farm. We will present these results compared to the manufacturers' guaranteed values and initiate explanations (like the difficulties to link the wind speed at 10m above ground with the wind speed received at hub height; or the influence of wind incidence on blades).

René Gamba; Sébastien Garrigues

2008-01-01T23:59:59.000Z

242

Wind Turbine Towers Establish New Height Standards and Reduce...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Wind Turbine Towers Establish New Height Standards and Reduce Cost of Wind Energy Wind Turbine Towers Establish New Height Standards and Reduce Cost of Wind Energy Case study that...

243

1Design limits and solutions for very large wind turbines Design limits and solutions for very large wind turbines  

E-Print Network [OSTI]

#12;#12;1Design limits and solutions for very large wind turbines UpWind Design limits and solutions for very large wind turbines A 20 MW turbine is feasible March 2011 Supported by: #12;March 20112 Photo:Nordex #12;3Design limits and solutions for very large wind turbines Contents 1. UpWind: Summary

Leu, Tzong-Shyng "Jeremy"

244

(Construction of a wind turbine). Final report  

SciTech Connect (OSTI)

A wind powered electrical generator was built by industrial arts students working in electricity, woodworking, and metal technology facilities. The blades were originally aluminum frames covered with sailcloth. These were replaced with hand-carved laminated basswood blades. Original plans called for a bullet and downwind propeller, but this was replaced with an upwind propeller and an aft-mounted tailfin. A V-belt and pulley drive transmits power from the turbine and a motorcycle brake stops the machine during high winds and/or for safe servicing. The original 13 volt, 105 amp alternator was replaced by a 12 volt, 100 amp dc generator. Publicity and dissemination events are listed as well as expenditures. (LEW)

Devine, L.E.

1982-03-22T23:59:59.000Z

245

Williams Stone Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Wind Turbine Wind Turbine Jump to: navigation, search Name Williams Stone Wind Turbine Facility Williams Stone Wind Turbine Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Williams Stone Developer Sustainable Energy Developments Energy Purchaser Williams Stone Location Otis MA Coordinates 42.232526°, -73.070952° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.232526,"lon":-73.070952,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

246

Nature's Classroom Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Nature's Classroom Wind Turbine Nature's Classroom Wind Turbine Jump to: navigation, search Name Nature's Classroom Wind Turbine Facility Nature's Classroom Wind Turbine Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Nature's Classroom Energy Purchaser Nature's Classroom Location Charlton MA Coordinates 42.113685°, -72.008475° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.113685,"lon":-72.008475,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

247

Meteorological aspects of siting large wind turbines  

SciTech Connect (OSTI)

This report, which focuses on the meteorological aspects of siting large wind turbines (turbines with a rated output exceeding 100 kW), has four main goals. The first is to outline the elements of a siting strategy that will identify the most favorable wind energy sites in a region and that will provide sufficient wind data to make responsible economic evaluations of the site wind resource possible. The second is to critique and summarize siting techniques that were studied in the Department of Energy (DOE) Wind Energy Program. The third goal is to educate utility technical personnel, engineering consultants, and meteorological consultants (who may have not yet undertaken wind energy consulting) on meteorological phenomena relevant to wind turbine siting in order to enhance dialogues between these groups. The fourth goal is to minimize the chances of failure of early siting programs due to insufficient understanding of wind behavior.

Hiester, T.R.; Pennell, W.T.

1981-01-01T23:59:59.000Z

248

Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loadings  

SciTech Connect (OSTI)

Large-eddy simulations of atmospheric boundary layers under various stability and surface roughness conditions are performed to investigate the turbulence impact on wind turbines. In particular, the aeroelastic responses of the turbines are studied to characterize the fatigue loading of the turbulence present in the boundary layer and in the wake of the turbines. Two utility-scale 5-MW turbines that are separated by seven rotor diameters are placed in a 3 km by 3 km by 1 km domain. They are subjected to atmospheric turbulent boundary layer flow and data is collected on the structural response of the turbine components. The surface roughness was found to increase the fatigue loads while the atmospheric instability had a small influence. Furthermore, the downstream turbines yielded higher fatigue loads indicating that the turbulent wakes generated from the upstream turbines have significant impact.

Lee, S.; Churchfield, M.; Moriarty, P.; Jonkman, J.; Michalakes, J.

2012-01-01T23:59:59.000Z

249

Study of the Reliability Enhancement of Wind Turbines Employing Direct-drive Technology.  

E-Print Network [OSTI]

??In traditional wind turbines employing gearboxes, the blades spin a shaft that is connected through a gearbox to the generator. The multiple wheels and bearings… (more)

Sara George, Reeba

2012-01-01T23:59:59.000Z

250

Influence of non-Gaussian wind characteristics on wind turbine extreme response  

Science Journals Connector (OSTI)

Abstract The wind turbulence inflows specified in current wind turbine design standards and turbine response simulation tools are usually modeled as stationary random Gaussian processes. Field measurement data, however, suggest that wind turbulence in complex terrain exhibits non-Gaussian characteristics. This study presents a comprehensive investigation on extreme response of operational and parked wind turbines to non-Gaussian wind field. The non-Gaussian wind fields with specified non-Gaussian statistics and power spectral characteristics are generated using translation process theory and spectral representation method. The wind turbine response time histories at each wind speed bin are simulated. The turbine response statistical moments influenced by the non-Gaussian wind inflow are examined. The extreme response distributions conditional on wind speeds are determined from the simulation data using global maxima method and random process model method. The overall extreme response distribution is then calculated by further integrating the distribution of mean wind speed, which is used to quantify the extreme responses with various mean recurrence intervals (MRIs). The results showed that the non-Gaussian characteristics of wind inflows can result in noticeably larger extremes of blade root edgewise and tower base fore-aft bending moments of operational turbine, and blade root flapwise bending moment of parked turbine. The responses with larger \\{MRIs\\} are more sensitive to the non-Gaussian characteristics of wind inflows. The responses of parked turbine are less sensitive to non-Gaussian, especially, the tower base side-to-side bending moment is almost not affected by non-Gaussian. New insights on the determination of extreme response distribution from random process method are also presented focusing on a better modeling of the response distribution tail.

Kuangmin Gong; Xinzhong Chen

2014-01-01T23:59:59.000Z

251

Wind Turbine Scaling Enables Projects to Reach New Heights |...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Turbine Scaling Enables Projects to Reach New Heights Wind Turbine Scaling Enables Projects to Reach New Heights August 18, 2014 - 9:42am Addthis Turbines at the National Wind...

252

Automatic Detection of Wind Turbine Clutter for Weather Radars  

Science Journals Connector (OSTI)

Wind turbines cause contamination of weather radar signals that is often detrimental and difficult to distinguish from cloud returns. Because the turbines are always at the same location, it would seem simple to identify where wind turbine ...

Kenta Hood; Sebastián Torres; Robert Palmer

2010-11-01T23:59:59.000Z

253

A low order model for vertical axis wind turbines  

E-Print Network [OSTI]

A new computational model for initial sizing and performance prediction of vertical axis wind turbines

Drela, Mark

254

Wind Turbines and Health A Rapid Review of the Evidence  

E-Print Network [OSTI]

1 Wind Turbines and Health A Rapid Review of the Evidence July 2010 #12;2 Wind Turbines and Health of the evidence from current literature on the issue of wind turbines and potential impacts on human health regarding wind turbines and their potential effect on human health. It is important to note that these views

Firestone, Jeremy

255

Doctoral Position Aeroelastic Analysis of Large Wind Turbines  

E-Print Network [OSTI]

Doctoral Position Aeroelastic Analysis of Large Wind Turbines In the research project "Aeroelastic Analysis Horizontal-axis wind turbine and numerical model. of Large Wind Turbines" funded by the Ger- man involving the in-house Finite-Element CFD code XNS to enable the simulation of wind turbines. The ability

256

Coupled multi-body dynamics and CFD for wind turbine simulation including explicit wind turbulence  

Science Journals Connector (OSTI)

Abstract A high fidelity approach for wind turbine aero-elastic simulations including explicit representation of the atmospheric wind turbulence is presented. The approach uses a dynamic overset computational fluid dynamics (CFD) code for the aerodynamics coupled with a multi-body dynamics (MBD) code for the motion responses to the aerodynamic loads. Mann's wind turbulence model was implemented into the CFD code as boundary and initial conditions. The wind turbulence model was validated by comparing the theoretical one-point spectrum for the three components of the velocity fluctuations, and by comparing the expected statistics from the CFD simulated wind turbulent field with the explicit wind turbulence inlet boundary from Mann model. Extensive simulations based on the proposed coupled approach were conducted with the conceptual NREL 5-MW offshore wind turbine in an increasing level of complexity, analyzing the turbine behavior as elasticity, wind shear and atmospheric wind turbulence are added to the simulations. Results are compared with the publicly available simulations results from OC3 participants, showing good agreement for the aerodynamic loads and blade tip deflections in time and frequency domains. Wind turbulence/turbine interaction was examined for the wake flow. It was found that explicit turbulence addition results in considerably increased wake diffusion. The coupled CFD/MBD approach can be extended to include multibody models of the shaft, bearings, gearbox and generator, resulting in a promising tool for wind turbine design under complex operational environments.

Y. Li; A.M. Castro; T. Sinokrot; W. Prescott; P.M. Carrica

2015-01-01T23:59:59.000Z

257

Modal testing of advanced wind turbine systems  

SciTech Connect (OSTI)

The US Department of Energy (DOE), in conjunction with the US wind industry, is supporting the development of technology for advanced, higher efficiency wind energy conversion systems. Under the Advanced Wind Turbine (AAWT) Program, the DOE, through the National Renewable Energy Laboratory (NREL), will assist US industry in incorporating advanced wind turbine technology into utility-grade wind turbines. As part of the AWT Program, NREL is conducting a range of activities aimed at assisting the wind industry with system design analysis and testing. One major activity is NREL`s Full System Model Testing (FSMT) task. In 1993 and 1994, NREL`s FSMT team conducted model surveys on several wind turbine systems developed by industry, including Atlantic Orient Corporation`s AOC 15/50, R. Lynette and Associates` AWT-26 P1, and Carter Wind Turbines Incorporated`s CWT-300. This paper describes how these model surveys were carried out and how industry and NREL wind researchers used the experimental results to validate their analytical models.

Osgood, R.M. [National Renewable Energy Laboratory, Golden, CO (United States). National Wind Technology Center

1995-09-01T23:59:59.000Z

258

Photo of the Week: Argonne's 10 kW Wind Turbine | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Photo of the Week: Argonne's 10 kW Wind Turbine Photo of the Week: Argonne's 10 kW Wind Turbine Photo of the Week: Argonne's 10 kW Wind Turbine November 9, 2012 - 11:57am Addthis At Argonne National Laboratory, the power generated by this 10 kW wind turbine helps scientists and engineers study the interaction of wind energy, electric vehicle charging and grid technology. The turbine is also estimated to offset more than 10 metric tons of greenhouse gas emissions annually. Learn more about renewable energy research at Argonne. | Photo courtesy of Argonne National Laboratory. At Argonne National Laboratory, the power generated by this 10 kW wind turbine helps scientists and engineers study the interaction of wind

259

Flexible dynamics of floating wind turbines  

E-Print Network [OSTI]

This work presents Tower Flex, a structural dynamics model for a coupled analysis of offshore floating wind turbines consisting of a tower, a floating platform and a mooring system. In this multi-body, linear frequency-domain ...

Luypaert, Thomas (Thomas J.)

2012-01-01T23:59:59.000Z

260

Intelligent Wind Turbine Program - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

further straining the limits of current design standards. As a result, modern wind turbines, having a design lifespan of 20 years, typically fail 2.6 times per year during...

Note: This page contains sample records for the topic "wind turbines generate" 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

Laser Vibrometry for Wind Turbines Inspection  

Science Journals Connector (OSTI)

We report about a development of a new 1.5 µm laser vibrometer system to measure vibrations of rotating blades of wind turbines up to a distance of several hundred meters featuring a...

Ebert, Reinhard; Lutzmann, Peter; Scherer, Clemens; Scherer-Negenborn, Norbert; Göhler, Benjamin; van Putten, F

262

Vertical Axis Wind Turbine Foundation parameter study  

SciTech Connect (OSTI)

The dynamic failure criterion governing the dimensions of prototype Vertical Axis Wind Turbine Foundations is treated as a variable parameter. The resulting change in foundation dimensions and costs is examined.

Lodde, P.F.

1980-07-01T23:59:59.000Z

263

Advanced wind turbine design studies: Advanced conceptual study. Final report  

SciTech Connect (OSTI)

In conjunction with the US Department of Energy and the National Renewable Energy Laboratory`s Advanced Wind Turbine Program, the Atlantic Orient Corporation developed preliminary designs for the next generation of wind turbines. These 50 kW and 350 kW turbines are based upon the concept of simplicity. By adhering to a design philosophy that emphasizes simplicity, we project that these turbines will produce energy at extremely competitive rates which will unlock the potential of wind energy domestically and internationally. The program consisted of three distinct phases. First, we evaluated the operational history of the Enertech 44 series wind turbines. As a result of this evaluation, we developed, in the second phase, a preliminary design for a new 50 kW turbine for the near-term market. In the third phase, we took a clean-sheet-of-paper approach to designing a 350 kW turbine focused on the mid-1990s utility market that incorporated past experience and advanced technology.

Hughes, P.; Sherwin, R. [Atlantic Orient Corp., Norwich, VT (United States)] [Atlantic Orient Corp., Norwich, VT (United States)

1994-08-01T23:59:59.000Z

264

Investigation of Wind Turbine Rotor Concepts for Offshore Wind Farms  

Science Journals Connector (OSTI)

Current plans in offshore wind energy developments call for further reduction of cost of energy. In order to contribute to this goal, several wind turbine rotor concepts have been investigated. Assuming the future offshore wind turbines will operate only in the offshore wind farms, the rotor concepts are not only evaluated for their stand-alone performances and their potential in reducing the loads, but also for their performance in an offshore wind farm. In order to do that, the 10MW reference wind turbine designed in Innwind.EU project is chosen as baseline. Several rotor parameters have been modified and their influences are investigated for offshore wind turbine design purposes. This investigation is carried out as a conceptual parametrical study. All concepts are evaluated numerically with BOT (Blade optimisation tool) software in wind turbine level and with Farmflow software in wind farm level for two wind farm layouts. At the end, all these concepts are compared with each other in terms of their advantages and disadvantages.

Özlem Ceyhan; Francesco Grasso

2014-01-01T23:59:59.000Z

265

How a Wind Turbine Works | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Works June 20, 2014 - 9:09am Addthis How does a wind turbine work? Previous Next Wind turbines operate on a simple principle. The energy in the wind turns two or three...

266

First wind turbine blade delivered to Pantex | National Nuclear...  

National Nuclear Security Administration (NNSA)

wind turbine blade delivered to Pantex Work crews began to erect the first of five wind turbines that will make up the Pantex Renewable Energy Project (PREP). The first wind...

267

Scale Models and Wind Turbines | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Scale Models and Wind Turbines Scale Models and Wind Turbines Below is information about the student activitylesson plan from your search. Grades 5-8, 9-12 Subject Wind Energy...

268

A Study on Vibration Isolation in a Wind Turbine Subjected to Wind and Seismic Loading.  

E-Print Network [OSTI]

??The primary loading on wind turbines is in the lateral direction and is of a stochastic nature, due to wind and seismic forces. As turbines… (more)

Van der Woude, Chad

2011-01-01T23:59:59.000Z

269

Probabilistic extreme response analysis of large wind turbines to natural winds.  

E-Print Network [OSTI]

??With increases in size and flexibility of modern wind turbines, especially for offshore applications, an improved understanding and assessment of turbine performance under various wind… (more)

Gong, Kuangmin

2014-01-01T23:59:59.000Z

270

Characterization of noise from an isolated intermediate-sized wind turbine  

Science Journals Connector (OSTI)

Community-based wind power companies provide subscriptions to individual homeowners and businesses for power generated by a locally installed turbine. Typically such turbines are of an intermediate size such as the Vestas V20 120-kW turbines operated by the Cascade Community Wind Company in several locations within Washington state. This model turbine has a tower height of 80 feet with a rotor diameter of 60 ft. Each turbine is installed individually on leased land with no other turbines nearby. Noise measurements of a turbine located in Thorp WA were obtained in a variety of weather conditions. On several occasions with low to moderate wind speeds the turbine was stopped enabling the calculation of noise due to the turbine only. Results will be presented showing spectral content and sound pressure level contours for a range of wind speeds.

2014-01-01T23:59:59.000Z

271

Applying micro scales of horizontal axis wind turbines for operation in low wind speed regions  

Science Journals Connector (OSTI)

Abstract Utilizing the micro scales of wind turbines could noticeably supply the demand for the electricity in low wind speed regions. Aerodynamic design and optimization of the blade, as a main part of a wind turbine, were addressed in the study. Three micro scales of horizontal axis wind turbines with output power of 0.5, 0.75 and 1 kW were considered and the geometric optimization of the blades in terms of the two involved parameters, chord and twist, was undertaken. In order to improve the performance of the turbines at low wind speeds, starting time was included in an objective function in addition to the output power – the main and desirable goal of the wind turbine blade design. A purpose-built genetic algorithm was employed to maximize both the output power and the starting performance which were calculated by the blade-element momentum theory. The results emphasize that the larger values of the chord and twist at the root part of the blades are indispensable for the better performance when the wind speed is low. However, the noticeable value of the generator resistive torque could largely delay the starting of the micro-turbines especially for the considered smaller size, 0.5 kW, where the starting aerodynamic torque could not overcome the generator resistive torque. For that size, an increase in the number of blades improved both the starting performance and also output power.

Abolfazl Pourrajabian; Reza Ebrahimi; Masoud Mirzaei

2014-01-01T23:59:59.000Z

272

Wind turbine technology—not as simple as it looks  

Science Journals Connector (OSTI)

Wind is a clean and inexhaustible energy resource serving mankind for many centuries by driving windmills to grind grain and pump water. This presentation gives a brief historical review from the earliest drag?type windmills existing as early as 2000 BC through the early electricity?generating units in the early 1900s to the present?day wind turbine parks. The 1973 oil embargo and 1979–80 price increases brought new awareness of conservation and promoted new interest in renewable energy resources and wind turbine technology. Many lessons are being learned in the design of modern wind turbines. The quest for low installation and maintenance costs energy conversion efficiency and high reliability continues. Unforeseen environmental issues such as visual pollution noiseimpacts and TV reception interference are to be addressed. The technical features and operating characteristics of various designs are presented including problems encountered and their solutions.

Michael C. Wehrey

1986-01-01T23:59:59.000Z

273

New tools for identification of wind turbine structures  

SciTech Connect (OSTI)

The new identification tools used in this research to analyze input-output time histories of a wind turbine structure, with a wide-band excitation, allow to obtain its modal state space representation. This representation reveals the internal behavior of the system, such as the interaction between its physical parameters. The techniques presented in this paper also allow researchers to obtain modal parameters, as well as frequency responses of a properly excited wind turbine structure immersed in wind noise. The use of two identification algorithms with the same, relatively simple numerical example, enables to compare the results obtained with the actual characteristics of the system modeled. Then, an example using the data generated by the ADAMS{reg_sign} model of the Micon 65/13 wind turbine structure is considered to illustrate additional elements to be included in the identification procedure for such a complex flexible structure.

Bialasiewicz, J.T.; Osgood, R.M. [National Renewable Enery Lab., Golden, CO (United States)

1995-12-31T23:59:59.000Z

274

A Summary of the Fatigue Properties of Wind Turbine Materials  

SciTech Connect (OSTI)

Modern wind turbines are fatigue critical machines that are typically used to produce electrical power from the wind. The materials used to construct these machines are subjected to a unique loading spectrum that contains several orders of magnitude more cycles than other fatigue critical structures, e.g., an airplane. To facilitate fatigue designs, a large database of material properties has been generated over the past several years that is specialized to materials typically used in wind turbines. In this paper, I review these fatigue data. Major sections are devoted to the properties developed for wood, metals (primarily aluminum) and fiberglass. Special emphasis is placed on the fiberglass discussion because this material is current the material of choice for wind turbine blades. The paper focuses on the data developed in the U.S., but cites European references that provide important insights.

SUTHERLAND, HERBERT J.

1999-10-07T23:59:59.000Z

275

NREL Small Wind Turbine Test Project: Mariah Power's Windspire Wind Turbine Test Chronology  

SciTech Connect (OSTI)

This report presents a chronology of tests conducted at NREL's National Wind Technology Center on Mariah Power's Windspire 1.2-kW wind turbine and a letter of response from Mariah Power.

Huskey, A.; Forsyth, T.

2009-06-01T23:59:59.000Z

276

Dynamic response analysis of a 900 kW wind turbine subject to ground excitation  

E-Print Network [OSTI]

response analysis of wind turbine towers including soil-were attached to the wind turbine tower at 7 locations alongload demands on the wind turbine tower structure. Additional

Caudillo, Adrian Felix

2012-01-01T23:59:59.000Z

277

Applied Materials Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Wind Turbine Wind Turbine Jump to: navigation, search Name Applied Materials Wind Turbine Facility Applied Materials Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Applied Materials Developer Applied Materials Energy Purchaser Applied Materials Location Gloucester MA Coordinates 42.62895426°, -70.65153122° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.62895426,"lon":-70.65153122,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

278

Portsmouth Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Portsmouth Wind Turbine Portsmouth Wind Turbine Facility Portsmouth Wind Turbine Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Town of Portsmouth Energy Purchaser Town of Portsmouth Location Portsmouth RI Coordinates 41.614216°, -71.25165° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.614216,"lon":-71.25165,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

279

Adaptive pitch control for variable speed wind turbines  

DOE Patents [OSTI]

An adaptive method for adjusting blade pitch angle, and controllers implementing such a method, for achieving higher power coefficients. Average power coefficients are determined for first and second periods of operation for the wind turbine. When the average power coefficient for the second time period is larger than for the first, a pitch increment, which may be generated based on the power coefficients, is added (or the sign is retained) to the nominal pitch angle value for the wind turbine. When the average power coefficient for the second time period is less than for the first, the pitch increment is subtracted (or the sign is changed). A control signal is generated based on the adapted pitch angle value and sent to blade pitch actuators that act to change the pitch angle of the wind turbine to the new or modified pitch angle setting, and this process is iteratively performed.

Johnson, Kathryn E. (Boulder, CO); Fingersh, Lee Jay (Westminster, CO)

2012-05-08T23:59:59.000Z

280

Dynamic validated model of a DFIG wind turbine  

Science Journals Connector (OSTI)

This paper presents the development and qualitative validation of a doubly-fed induction generator (DFIG) wind turbine model that is represented in terms of behaviour equations of each of the subsystems, mainly the turbine rotor, the drive train, the induction generator, the power converters and associated control systems and a protection system. Simulation results obtained from the models are compared to the field measurement data in a qualitative manner due to rotor wake and lack of ability of a single anemometer for adequate measurement of wind speed acting on the large surface of the rotor. It is concluded that the model is reasonably accurate and can hence be used for representing wind turbines in power system dynamics simulations.

Md. Ayaz Chowdhury; Nasser Hosseinzadeh; Weixiang Shen

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Measurement of the underwater noise levels generated from marine piling associated with the installation of offshore wind turbines.  

Science Journals Connector (OSTI)

Marine piling is the most commonly used method for the installation of offshore wind turbines in the shallow coastal waters in the UK and consists of steel mono?piles being driven into the seabed using powerful hydraulic hammers. This is a source of impulsive sound of potentially high level that can travel a considerable distance in the water column and has the potential for impact on marine life. This presentation describes methodologies developed for measurement of marine piling and for the estimation of the energy source level. Measurements are presented for piles of typically 5 m in diameter driven by hammers with typical strike energies of 1000 kJ. Data were recorded as a function of range from the source using vessel?deployed hydrophones and using fixed acoustic buoys that recorded the entire piling sequence including soft start. The methodology of measurement is described along with the method of estimation of the energy source level. Limitations and knowledge gaps are discussed.

Pete D. Theobald; Stephen P. Robinson; Michael A. Ainslie; Christ A. F. de Jong; Paul A. Lepper

2011-01-01T23:59:59.000Z

282

Jet spoiler arrangement for wind turbine  

DOE Patents [OSTI]

An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the end thereof and is ejected in the form of air jets through small holes or openings provided along the lengths of the blades. The air jets create flow separation at the surfaces of the turbine blades, thereby including stall conditions and reducing the output power. A feedback control unit senses the power output of the turbine and controls the amount of air drawn into the air inlets accordingly.

Cyrus, J.D.; Kadlec, E.G.; Klimas, P.C.

1983-09-15T23:59:59.000Z

283

Vertical axis wind turbine control strategy  

SciTech Connect (OSTI)

Early expensive in automatic operation of the Sandia 17-m vertical axis research wind turbine (VAWT) has demonstrated the need for a systematic study of control algorithms. To this end, a computer model has been developed that uses actual wind time series and turbine performance data to calculate the power produced by the Sandia 17-m VAWT operating in automatic control. The model has been used to investigate the influence of starting algorithms on annual energy production. The results indicate that, depending on turbine and local wind characteristics, a bad choice of a control algorithm can significantly reduce overall energy production. The model can be used to select control algorithms and threshold parameters that maximize long-term energy production. An attempt has been made to generalize these results from local site and turbine characteristics to obtain general guidelines for control algorithm design.

McNerney, G.M.

1981-08-01T23:59:59.000Z

284

Xi an Nordex Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment...  

Open Energy Info (EERE)

Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment Co Ltd Jump to: navigation, search Name: Xi'an Nordex Wind Turbine Co Ltd (aka Xi'an Weide Wind Power Equipment Co Ltd)...

285

Impact of SCIG and DFIG Type Wind Turbine on the Stability of Distribution Networks: static and dynamic  

E-Print Network [OSTI]

Impact of SCIG and DFIG Type Wind Turbine on the Stability of Distribution Networks: static fed induction generator (DFIG) type wind turbine in distribution networks. The analysis is carried out and DFIG type wind turbines have significant impact on the static voltage stability, power loss

Pota, Himanshu Roy

286

Middelgrunden Wind Turbine Cooperative | Open Energy Information  

Open Energy Info (EERE)

Middelgrunden Wind Turbine Cooperative Middelgrunden Wind Turbine Cooperative Jump to: navigation, search Name Middelgrunden Wind Turbine Cooperative Place Copenhagen, Denmark Zip 2200 Sector Wind energy Product Copenhagen-based, partnership founded in May 1997 by the Working Group for Wind Turbines on Middelgrunden, with the aim to produce electricity through the establishment and management of wind turbines on the Middelgrunden shoal. Coordinates 55.67631°, 12.569355° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":55.67631,"lon":12.569355,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

287

Iskra Wind Turbine Manufacturers Ltd | Open Energy Information  

Open Energy Info (EERE)

Iskra Wind Turbine Manufacturers Ltd Iskra Wind Turbine Manufacturers Ltd Jump to: navigation, search Name Iskra Wind Turbine Manufacturers Ltd Place Nottingham, United Kingdom Sector Wind energy Product Iskra manufactures and markets the AT5-1 home-sized wind turbine rated at 5.3 kW, suitable for low wind speeds. References Iskra Wind Turbine Manufacturers Ltd[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Iskra Wind Turbine Manufacturers Ltd is a company located in Nottingham, United Kingdom . References ↑ "Iskra Wind Turbine Manufacturers Ltd" Retrieved from "http://en.openei.org/w/index.php?title=Iskra_Wind_Turbine_Manufacturers_Ltd&oldid=347129" Categories: Clean Energy Organizations

288

Ris-PhD-Report Wind Turbines: Unsteady Aerodynamics and  

E-Print Network [OSTI]

Risø-PhD-Report Wind Turbines: Unsteady Aerodynamics and Inflow Noise Brian Riget Broe Risø-PhD-47 Title: Wind Turbines: Unsteady Aerodynamics and Inflow Noise Division: Wind Energy Division Risø-PhD-47(EN) December 2009 Abstract (max. 2000 char.): Aerodynamical noise from wind turbines due

289

Ris-R-1330(EN) Wind Turbine Power Performance  

E-Print Network [OSTI]

Risø-R-1330(EN) Wind Turbine Power Performance Verification in Complex Terrain and Wind Farms/EN 61400-12 Ed 1 standard for wind turbine power performance testing is being revised. The standard on power performance measurements on individual wind turbines. The second one is a power performance

290

Dynamic Simulation of DFIG Wind Turbines on FPGA Boards  

E-Print Network [OSTI]

Dynamic Simulation of DFIG Wind Turbines on FPGA Boards Hao Chen, Student Member, IEEE, Song Sun is a friction coefficient. The wind turbine model is based on the relation between the upstream wind speed V w + 1 where p is the air density; Rw is the wind turbine radius; cp (A, (3) is the performance

Zambreno, Joseph A.

291

Power control of a wind farm with active stall wind turbines and AC grid connection  

E-Print Network [OSTI]

Power control of a wind farm with active stall wind turbines and AC grid connection Anca D. Hansen1 controller for a wind farm made-up exclusively of active stall wind turbines with AC grid connection wind farm control involves both the control on wind turbine level as well as the central control

292

Fixed-Speed and Variable-Slip Wind Turbines Providing Spinning Reserves to the Grid: Preprint  

SciTech Connect (OSTI)

As the level of wind penetration increases, wind turbine technology must move from merely generating power from wind to taking a role in supporting the bulk power system. Wind turbines should have the capability to provide inertial response and primary frequency (governor) response so they can support the frequency stability of the grid. To provide governor response, wind turbines should be able to generate less power than the available wind power and hold the rest in reserve, ready to be accessed as needed. This paper explores several ways to control wind turbine output to enable reserve-holding capability. This paper focuses on fixed-speed (also known as Type 1) and variable-slip (also known as Type 2) turbines.

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

2012-11-01T23:59:59.000Z

293

Portsmouth Abbey School Wind Turbine Wind Farm | Open Energy Information  

Open Energy Info (EERE)

School Wind Turbine Wind Farm School Wind Turbine Wind Farm Jump to: navigation, search Name Portsmouth Abbey School Wind Turbine Wind Farm Facility Portsmouth Abbey School Wind Turbine Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Portsmouth Abbey School Developer Portsmouth Abbey School Energy Purchaser Portsmouth Abbey School Location Portsmouth RI Coordinates 41.599032°, -71.268688° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.599032,"lon":-71.268688,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

294

Harbec Plastic Wind Turbine Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Harbec Plastic Wind Turbine Wind Farm Harbec Plastic Wind Turbine Wind Farm Jump to: navigation, search Name Harbec Plastic Wind Turbine Wind Farm Facility Harbec Plastic Wind Turbine Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Harbeck Plastic Developer Lorax Energy Systems Energy Purchaser Harbeck Plastic Location Rochester NY Coordinates 43.226039°, -77.361776° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.226039,"lon":-77.361776,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

295

2014 Sandia Wind Turbine Blade Workshop  

Broader source: Energy.gov [DOE]

The U.S. Energy Department's Sandia National Laboratories will host its 2014 Sandia Wind Turbine Blade Workshop at the Marriott Pyramid North in Albuquerque, New Mexico. The workshop provides a unique, blade focused collaborative forum that will bring together wind energy leaders from industry, academia, and government. Stay tuned for updates. Information regarding past Wind Workshops can be found at: http://windworkshops.sandia.gov/.

296

Foundations for offshore wind turbines  

Science Journals Connector (OSTI)

...wind farms, although supplying green energy, tend to provoke some objections...wind farms, although supplying 'green energy', tend to provoke some objections...wind farms, although supplying `green energy', tend to provoke some objections...

2003-01-01T23:59:59.000Z

297

Efficiency of a gearbox lubricated with wind turbine gear oils  

Science Journals Connector (OSTI)

Abstract In this study a two stage multiplying gearbox with helical gears and four fully formulated wind turbine gear oils were tested, on a back-to-back gearbox test rig with recirculating power, at low input speeds (100–500 rpm) and high input torques (500–1000 Nm). The gearbox oil sump temperature was set free. A numeric power loss model simulating all the relevant power loss mechanisms was implemented, aiming to evaluate the relative influence of each power loss component. The experimental results have shown that each wind turbine gear oil formulation generated different power loss resulting in distinct stabilized operating temperatures.

Pedro M.T. Marques; Carlos M.C.G. Fernandes; Ramiro C. Martins; Jorge H.O. Seabra

2014-01-01T23:59:59.000Z

298

Torque ripple in a Darrieus, vertical axis wind turbine  

SciTech Connect (OSTI)

Interaction between a steady wind and a rotating, Darrieus, vertical axis wind turbine produces time periodic aerodynamic loads which cause time dependent torque variations, referred to as torque ripple, to occur in the mechanical link between the turbine and the electrical generator. There is concern for the effect of torque ripple upon fatigue life of drive train components and upon power quality. An analytical solution characterizing the phenomenon of torque ripple has been obtained which is based upon a Fourier expansion of the time dependent features of the problem. Numerical results for torque ripple, some experimental data, determination of acceptable levels and methods of controlling it, are presented and discussed.

Reuter, R.C. Jr.

1980-09-01T23:59:59.000Z

299

Danish Wind Turbine Owners Association | Open Energy Information  

Open Energy Info (EERE)

Owners Association Owners Association Jump to: navigation, search Name Danish Wind Turbine Owners' Association Place Aarhus C, Denmark Zip DK-8000 Sector Wind energy Product Danish Wind Turbine Ownersâ€(tm) Association is a non-profit, independent association overseeing wind turbine ownersâ€(tm) mutual interests regarding the authorities, political decision-makers, utilities and wind turbine manufacturers. References Danish Wind Turbine Owners' Association[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Danish Wind Turbine Owners' Association is a company located in Aarhus C, Denmark . References ↑ "Danish Wind Turbine Owners' Association" Retrieved from "http://en.openei.org/w/index.php?title=Danish_Wind_Turbine_Owners_Association&oldid=344068

300

Quantifying the hurricane risk to offshore wind turbines  

Science Journals Connector (OSTI)

...generation and transmission costs. U...Atlantic hurricane data show that hurricane...vertical dotted line shows the design...cannot yaw (solid line). The nonyawing...widespread power outages. Wind turbine design...replaced. Dashed lines plot the distribution...distribution is fitted to data from tropical cyclones...

Stephen Rose; Paulina Jaramillo; Mitchell J. Small; Iris Grossmann; Jay Apt

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES  

E-Print Network [OSTI]

SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES damage in real size structural components of offshore wind turbines. KEYWORDS : Damage detection, Offshore wind turbines, Numerical response simulation. INTRODUCTION Offshore wind turbines are exposed

Paris-Sud XI, Université de

302

E-Print Network 3.0 - axis wind turbines Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

turbines Search Powered by Explorit Topic List Advanced Search Sample search results for: axis wind turbines...

303

E-Print Network 3.0 - axis wind turbine Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

turbine Search Powered by Explorit Topic List Advanced Search Sample search results for: axis wind turbine...

304

Sinomatech Wind Power Blade aka Sinoma Science Technology Wind Turbine  

Open Energy Info (EERE)

Sinomatech Wind Power Blade aka Sinoma Science Technology Wind Turbine Sinomatech Wind Power Blade aka Sinoma Science Technology Wind Turbine Blade Co Ltd Jump to: navigation, search Name Sinomatech Wind Power Blade (aka Sinoma Science & Technology Wind Turbine Blade Co Ltd) Place Nanjing, Jiangsu Province, China Zip 210012 Sector Wind energy Product Jiangsu-based wind turbine blade manufactuer. Coordinates 32.0485°, 118.778969° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.0485,"lon":118.778969,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

305

2/16/2014 Can You Charge Your Mobile With Wind Turbine? -TechTxr http://www.techtxr.com/can-charge-mobile-wind-turbine/ 1/7  

E-Print Network [OSTI]

Turbine? | February 9, 2014 Wind Energy Wind Mill Wind Power Wind Mobile About Wind Power Wind! Mobile Power Dead Battery Wind Mill #12;2/16/2014 Can You Charge Your Mobile With Wind Turbine? - Tech2/16/2014 Can You Charge Your Mobile With Wind Turbine? - TechTxr http://www.techtxr.com/can-charge-mobile-wind

Chiao, Jung-Chih

306

Calculation Method of Losses and Efficiency of Wind Generators  

Science Journals Connector (OSTI)

In the methods presented in this chapter, wind speed is used as the input data, ... conditions of the WG system, for example, wind turbine output, generator output, output power to the power grid, and various los...

Junji Tamura

2012-01-01T23:59:59.000Z

307

Technological Advances in Hydraulic Drive Trains for Wind Turbines  

Science Journals Connector (OSTI)

The reliability of frequency converters is a major concern for wind turbines. ChapDrive AS has built and tested a hydraulic drive train for variable speed wind turbines which includes a synchronous generator that is connected to the grid without the use of a frequency converter. The hydraulic drive train consists of a hydraulic pump, a variable displacement hydraulic motor, and a synchronous generator, which enables rotor speed control while maintaining synchronous speed of the generator. It has been proven that the hydraulic drive train and the ChapDrive Control system are able to absorb fluctuations in the wind speed and maintain a constant power output without the use of frequency converters. The hydraulic drive train and the ChapDrive Control system has been modeled analytically and compared to measurements, demonstrating a good agreement between simulations and measurements.

K.E.Thomsen; O.G. Dahlhaug; M.O.K. Niss; S.K. Haugset

2012-01-01T23:59:59.000Z

308

Pioneer Asia Wind Turbines | Open Energy Information  

Open Energy Info (EERE)

Turbines Turbines Jump to: navigation, search Name Pioneer Asia Wind Turbines Place Madurai, Tamil Nadu, India Zip 625 002 Sector Wind energy Product Madurai-based wind energy division of the Pioneer Group. Coordinates 9.92544°, 78.1192° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":9.92544,"lon":78.1192,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

309

Wind Turbine Design Cost and Scaling Model  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Wind Turbine Design Cost Wind Turbine Design Cost and Scaling Model L. Fingersh, M. Hand, and A. Laxson Technical Report NREL/TP-500-40566 December 2006 NREL is operated by Midwest Research Institute â—Ź Battelle Contract No. DE-AC36-99-GO10337 Wind Turbine Design Cost and Scaling Model L. Fingersh, M. Hand, and A. Laxson Prepared under Task No. WER6.0703 Technical Report NREL/TP-500-40566 December 2006 National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393 303-275-3000 * www.nrel.gov Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by Midwest Research Institute * Battelle Contract No. DE-AC36-99-GO10337 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government.

310

Built-Environment Wind Turbine Roadmap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Built-Environment Wind Turbine Built-Environment Wind Turbine Roadmap J. Smith, T. Forsyth, K. Sinclair, and F. Oteri Technical Report NREL/TP-5000-50499 November 2012 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. National Renewable Energy Laboratory 15013 Denver West Parkway Golden, Colorado 80401 303-275-3000 * www.nrel.gov Contract No. DE-AC36-08GO28308 Built-Environment Wind Turbine Roadmap J. Smith, T. Forsyth, K. Sinclair, and F. Oteri Prepared under Task No. WE11250 Technical Report NREL/TP-5000-50499 November 2012 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government.

311

Wyoming Wind Power Project (generation/wind)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Wind Power > Generation Hydro Power Wind Power Monthly GSP BPA White Book Dry Year Tools Firstgov Wyoming Wind Power Project (Foote Creek Rim I and II) Thumbnail image of wind...

312

Smart Phone Technologies Reduce Risks to Eagles from Wind Turbines...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Smart Phone Technologies Reduce Risks to Eagles from Wind Turbines Smart Phone Technologies Reduce Risks to Eagles from Wind Turbines January 10, 2013 - 2:12pm Addthis This is an...

313

Gamesa Wind Turbines Pvt Ltd | Open Energy Information  

Open Energy Info (EERE)

energy Product: Chennai-based wind turbine manufacturing JV. References: Gamesa Wind Turbines Pvt. Ltd.1 This article is a stub. You can help OpenEI by expanding it. Gamesa...

314

Distributed Wind Market Report: Small Turbines Lead to Big Growth...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Growth in Exports August 18, 2014 - 12:13pm Addthis 1 of 11 Three 100 kilowatt (kW) wind turbines in Bisaccia, Italy. Last year, U.S. small wind turbines were exported to more than...

315

Multi-hazard Reliability Assessment of Offshore Wind Turbines  

E-Print Network [OSTI]

A probabilistic framework is developed to assess the structural reliability of offshore wind turbines. Probabilistic models are developed to predict the deformation, shear force and bending moment demands on the support structure of wind turbines...

Mardfekri Rastehkenari, Maryam 1981-

2012-12-04T23:59:59.000Z

316

A simulation-based planning system for wind turbine construction  

Science Journals Connector (OSTI)

Wind turbine construction is a challenging undertaking due to the need to lift heavy loads to high locations in conditions of high and variable wind speeds. These conditions create great risks to contractors during the turbine assembly process. This ...

Dina Atef; Hesham Osman; Moheeb Ibrahim; Khaled Nassar

2010-12-01T23:59:59.000Z

317

Understanding Trends in Wind Turbine Prices Over the Past Decade  

E-Print Network [OSTI]

Wind turbines are material-intensive. Each individual tower,and “towers and lattice masts,” and assume that 100% of the former and 95% of the latter are attributable to wind turbines.

Bolinger, Mark

2012-01-01T23:59:59.000Z

318

Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes Presented by Paul John Baker of FrontierPro Services at the Wind Turbine Tribology Seminar 2014. 141030 Axial...

319

Long-Term Dynamic Monitoring of an Offshore Wind Turbine  

Science Journals Connector (OSTI)

Future Offshore Wind Turbines will be hardly accessible; therefore, in ... modes of the foundation and tower structures. Wind turbines are complex structures and their dynamics vary ... track changes in the dynam...

Christof Devriendt; Filipe Magalhăes…

2013-01-01T23:59:59.000Z

320

Suppression of the vibrations of wind turbine towers  

Science Journals Connector (OSTI)

......suppression of the vibrations of wind turbine towers. As a source of renewable and clean energy, wind power is rapidly increasing its...capacity in many countries. Large offshore turbines are subjected to severe weather......

Xiaowei Zhao; George Weiss

2011-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Structural responses and power output of a wind turbine are strongly affected by the wind field acting on the wind turbine. Knowledge about the wind field and its  

E-Print Network [OSTI]

ABSTRACT Structural responses and power output of a wind turbine are strongly affected by the wind affect the power output and structural responses of a wind turbine. Wind field characteristics are conventionally described by time averaged features, such as mean wind speed, turbulence intensity and power

Stanford University

322

Spare Part Logistics and Optimization for Wind Turbines.  

E-Print Network [OSTI]

?? The wind power industry is maturing and the amount of electricity produced by wind turbines in the world is rapidly increasing every year. Service… (more)

Lindqvist, Mattias

2010-01-01T23:59:59.000Z

323

Wind Turbine System State Awareness - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Program are developing a multi-physics modeling approach for the analysis of wind turbines in the presence of realistic wind loading. DescriptionResearchers at the Los...

324

SciTech Connect: Improved Wind Turbine Drivetrain Reliability...  

Office of Scientific and Technical Information (OSTI)

and Renewable Energy Country of Publication: United States Language: English Subject: 17 WIND ENERGY; 97 MATHEMATICS AND COMPUTING NONTORQUE LOADS; WIND TURBINE DRIVETRAIN;...

325

Indian Wind Turbine Manufacturers Association | Open Energy Informatio...  

Open Energy Info (EERE)

Manufacturers Association Jump to: navigation, search Name: Indian Wind Turbine Manufacturers Association Place: Chennai, India Zip: 600 041 Sector: Wind energy Product:...

326

Titan propels GE wind turbine research into new territory | ornl...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Titan propels GE wind turbine research into new territory January 17, 2014 The amount of global electricity supplied by wind, the world's fastest growing energy source, is expected...

327

Amplitude modulation of wind turbine noise  

E-Print Network [OSTI]

Due to swish and thump amplitude modulation, the noise of wind turbines cause more annoyance than other environmental noise of the same average level. The wind shear accounts for the thump modulation (van den Berg effect). Making use of the wind speed measurements at the hub height, as well as at the top and the bottom of the rotor disc (Fig.1), the non-standard wind profile is applied. It causes variations in the A-weighted sound pressure level, LpA. The difference between the maximum and minimum of LpA characterizes thump modulation (Fig.2).

Makarewicz, Rufin

2013-01-01T23:59:59.000Z

328

Gone with the Wind - The Potential Tragedy of the Common Wind  

E-Print Network [OSTI]

or erection of wind turbine towers, relay stations, and/orof Wind Turbine Generator Operation Using Tower Shadowbetween wind turbines and cell phone towers). 152. Guzek,

Lifshitz-Goldberg, Yaei

2010-01-01T23:59:59.000Z

329

Full-scale modal wind turbine tests: comparing shaker excitation with wind excitation  

Science Journals Connector (OSTI)

The test facilities at the National Wind Technology Center (NWTC) of the National ... control schemes and equipment for reducing loads on wind turbine components. As wind turbines become lighter and more flexible...

Richard Osgood; Gunjit Bir; Heena Mutha…

2011-01-01T23:59:59.000Z

330

Determination of fault operation dynamical constraints for the design of wind turbine DFIG drives  

Science Journals Connector (OSTI)

This paper presents an efficient design tool for the estimation of the transient electromagnetic peak torque and transient rotor over-voltages of wind turbines (WT) doubly-fed induction generators (DFIG) during severe fault conditions on the grid side. ... Keywords: Dynamical constraint, Integrated design, Non-linear optimization, Wind turbine

Davide Aguglia; Philippe Viarouge; René Wamkeue; Jérôme Cros

2010-10-01T23:59:59.000Z

331

Ris-R-1352(EN) Models for Wind Turbines  

E-Print Network [OSTI]

Risø-R-1352(EN) Models for Wind Turbines ­ a Collection Andreas Baumgart Gunner C. Larsen, Morten H is to supply new approaches to stability investigations of wind turbines. The author's opinion #12;Contents 1 Preface 5 2 Author's Notes 7 3 Theory of Rods applied to Wind Turbine Blades 9 3

332

Wave Models for Offshore Wind Turbines Puneet Agarwal  

E-Print Network [OSTI]

Wave Models for Offshore Wind Turbines Puneet Agarwal§ and Lance Manuely Department of Civil for estimating loads on the support structure (monopile) of an offshore wind turbine. We use a 5MW utility-scale wind turbine model for the simulations. Using, first, the sim- pler linear irregular wave modeling

Manuel, Lance

333

Detection of aeroacoustic sound sources on aircraft and wind turbines  

E-Print Network [OSTI]

Detection of aeroacoustic sound sources on aircraft and wind turbines Stefan Oerlemans #12;Detection of aeroacoustic sound sources on aircraft and wind turbines S. Oerlemans Thesis University;DETECTION OF AEROACOUSTIC SOUND SOURCES ON AIRCRAFT AND WIND TURBINES PROEFSCHRIFT ter verkrijging van de

Twente, Universiteit

334

Control of Wind Turbines for Power Regulation and  

E-Print Network [OSTI]

Control of Wind Turbines for Power Regulation and Load Reduction Juan Jose Garcia Quirante Kongens regulation and load reduction and their ensemble in a variable-speed wind turbine. The power regulation aspects of mathematical modelling of wind turbines, and especially the control methods suited for power

335

AIAA-2004-1184 AN AEROACOUSTIC ANALYSIS OF WIND TURBINES*  

E-Print Network [OSTI]

AIAA-2004-1184 1 AN AEROACOUSTIC ANALYSIS OF WIND TURBINES* Philip J. Morris, Lyle N. Long computational aeroacoustic methods that are being applied to predict the noise radiated by wind turbines. Since the wind turbine noise problem is very challenging, only some of the important noise sources and mechanisms

336

RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT)  

E-Print Network [OSTI]

RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT) Yizhou Lu, T. M. Delorm, A. Christou of the reliability of these 5 Types Surrogate failure rate data Onshore wind turbines (OT) 1-1.5MW CONCLUSIONS., Faulstich, S. & van Bussel G. J. W. Reliability & availability of wind turbine electrical & electronic

Bernstein, Joseph B.

337

A Simplified Morphing Blade for Horizontal Axis Wind Turbines  

E-Print Network [OSTI]

A Simplified Morphing Blade for Horizontal Axis Wind Turbines Weijun WANG , St´ephane CARO, Fouad salinas@hotmail.com The aim of designing wind turbine blades is to improve the power capture ability by adjusting the twist of the blade's root and tip. To evaluate the performance of wind turbine blades

Recanati, Catherine

338

Taming Hurricanes With Arrays of Offshore Wind Turbines  

E-Print Network [OSTI]

Taming Hurricanes With Arrays of Offshore Wind Turbines Mark Z. Jacobson Cristina Archer, Willet #12;Representation of a vertically-resolved wind turbine in model Lines are model layers) or 50 m/s (destruction) speed. Can Walls of Offshore Wind Turbines Dissipate Hurricanes? #12;Katrina

Firestone, Jeremy

339

Condition Monitoring of Wind Turbines Based on Amplitude Demodulation  

E-Print Network [OSTI]

Condition Monitoring of Wind Turbines Based on Amplitude Demodulation Yassine Amirat University. In order to make wind turbine reliable and competitive, it is important to reduce the operational-stationary behavior. Index Terms--Wind turbine, Fault Detection, Bearings, Signal Processing, Amplitude Modulation I

Paris-Sud XI, Université de

340

Potential Flow Modelling for Wind Turbines Shane Cline  

E-Print Network [OSTI]

Potential Flow Modelling for Wind Turbines by Shane Cline B.Sc., University of Toledo, 2003 M means, without the permission of the author. #12;ii Potential Flow Modelling for Wind Turbines by Shane potential flow methods are a promising alternative to mainstream wind turbine aerodynamics tools

Victoria, University of

Note: This page contains sample records for the topic "wind turbines generate" 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

Development of Wind Turbines Prototyping Software Under Matlab/Simulink  

E-Print Network [OSTI]

204 1 Development of Wind Turbines Prototyping Software Under Matlab/Simulink® Through present the development of a wind turbine prototyping software under Matlab/Simulink® through and the end of 1999, around 75% of all new grid-connected wind turbines worldwide were installed in Europe [3

Paris-Sud XI, Université de

342

LIGHTNING EXPOSURE OF WIND TURBINES University of Toronto  

E-Print Network [OSTI]

LIGHTNING EXPOSURE OF WIND TURBINES Dale Dolan University of Toronto e-mail: dale@ecf.utoronto.ca Abstract This paper applies the electrogeometric model of lightning exposure to a wind turbine to compute. For a typical 45 m wind turbine, the probability of being struck by a downward negative flash, as predicted

Lehn, Peter W.

343

Disturbance Control of the Hydraulic Brake in a Wind Turbine  

E-Print Network [OSTI]

Disturbance Control of the Hydraulic Brake in a Wind Turbine Frank Jepsen, Anders Søborg brake in a wind turbine. Brake torque is determined by friction coefficient and clamp force; the latter brake is one1 of the two independent brake systems in a wind turbine. As a consequence of the gearing

Yang, Zhenyu

344

SOUND COMPLIANCE MONITORING FOR THE GAMESA WIND TURBINE  

E-Print Network [OSTI]

SOUND COMPLIANCE MONITORING FOR THE GAMESA WIND TURBINE UD - LEWES, DELAWARE January 2011 ` #12;SOUND COMPLIANCE MONITORING FOR THE GAMESA WIND TURBINE AT THE UNIVERSITY OF DELAWARE LEWES, DELAWARE A Gamesa G90 2.0-MW wind turbine operates at the University of Delaware (UD), Lewes campus on a parcel

Firestone, Jeremy

345

Stochastic Analysis of Wind Turbine Power Curves Edgar Anahua  

E-Print Network [OSTI]

of the wind turbine to its desired power production; and ii) the stochastic force (noise), whichStochastic Analysis of Wind Turbine Power Curves Edgar Anahua Oldenburg 2007 Zur Homepage der Dissertation #12;#12;Stochastic Analysis of Wind Turbine Power Curves Edgar Anahua Von der Fakult¨at f

Peinke, Joachim

346

Quantifying the hurricane risk to offshore wind turbines  

Science Journals Connector (OSTI)

...Quantifying the hurricane risk to offshore wind turbines 10.1073/pnas.1111769109...observed in typhoons, but no offshore wind turbines have yet been built in the...Gulf coast is 460 GW (2). Offshore wind turbines in these areas will be at...

Stephen Rose; Paulina Jaramillo; Mitchell J. Small; Iris Grossmann; Jay Apt

2012-01-01T23:59:59.000Z

347

Airfoil family design for large offshore wind turbine blades  

Science Journals Connector (OSTI)

Wind turbine blades size has scaled-up during last years due to wind turbine platform increase especially for offshore applications. The EOLIA project 2007-2010 (Spanish Goverment funded project) was focused on the design of large offshore wind turbines for deep waters. The project was managed by ACCIONA Energia and the wind turbine technology was designed by ACCIONA Windpower. The project included the design of a wind turbine airfoil family especially conceived for large offshore wind turbine blades, in the order of 5MW machine. Large offshore wind turbines suffer high extreme loads due to their size, in addition the lack of noise restrictions allow higher tip speeds. Consequently, the airfoils presented in this work are designed for high Reynolds numbers with the main goal of reducing blade loads and mantainig power production. The new airfoil family was designed in collaboration with CENER (Spanish National Renewable Energy Centre). The airfoil family was designed using a evolutionary algorithm based optimization tool with different objectives, both aerodynamic and structural, coupled with an airfoil geometry generation tool. Force coefficients of the designed airfoil were obtained using the panel code XFOIL in which the boundary layer/inviscid flow coupling is ineracted via surface transpiration model. The desing methodology includes a novel technique to define the objective functions based on normalizing the functions using weight parameters created from data of airfoils used as reference. Four airfoils have been designed, here three of them will be presented, with relative thickness of 18%, 21%, 25%, which have been verified with the in-house CFD code, Wind Multi Block WMB, and later validated with wind tunnel experiments. Some of the objectives for the designed airfoils concern the aerodynamic behavior (high efficiency and lift, high tangential coefficient, insensitivity to rough conditions, etc.), others concern the geometry (good for structural design, compatibility for the different airfoil family members, etc.) and with the ultimate objective that the airfoils will reduce the blade loads. In this paper the whole airfoil design process and the main characteristics of the airfoil family are described. Some force coefficients for the design Reynolds number are also presented. The new designed airfoils have been studied with computational calculations (panel method code and CFD) and also in a wind tunnel experimental campaign. Some of these results will be also presented in this paper.

B Méndez; X Munduate; U San Miguel

2014-01-01T23:59:59.000Z

348

Realization and control of a wind turbine connected to the grid by using PMSG  

Science Journals Connector (OSTI)

Abstract This paper studies the control of a variable-speed wind turbine using the permanent magnet synchronous generator (PMSG) driven by a wind turbine emulator. The wind turbine is realized by imposing the wind profile on emulator to behave as the real wind turbine when it receives the same wind profile. This wind turbine is connected to the grid by means of a two back-to-back voltage-fed pulse width-modulation (PWM) converters to interface the generator and the grid. This paper has three main objectives, the first is realization of the wind turbine emulator, the second is extracting and exploiting the maximum power from the wind, the third is feeding the grid by high-power and good electrical energy quality; to achieve that, we applied the strategies of maximum power point tracking (MPPT) using optimal torque control which allows the PMSG to operate at an optimal speed. The inverter is used for delivering power to the grid, controlled in a way to deliver only the active power into the grid, thus we have unit power factor. DC-link voltage is also controlled by the inverter. This paper shows the dynamic performances of the complete system by its simulation using Matlab Simulink. Experimental results has verified and validated the wind turbine emulator and the efficiency of MPPT control method using a variable wind profile.

Abdeldjalil Dahbi; Mabrouk Hachemi; Nasreddine Nait-Said; Mohamed-Said Nait-Said

2014-01-01T23:59:59.000Z

349

Building the Basic PVC Wind Turbine  

K-12 Energy Lesson Plans and Activities Web site (EERE)

This plan shows how to make a rugged and inexpensive classroom wind turbine that can be used for lab bench-based blade design experiments. While a few specialized parts are needed (a hub and DC motor), the rest of the components are easily found at most hardware stores.

350

Redesign of a wind turbine hub  

E-Print Network [OSTI]

The current designs of wind turbine hubs contain many faults. The slew ring bearing that connects the blade to the hub takes on a large bending moment that in many cases causes the joints to fail and the blade to break ...

Hunter-Jones, Bridget I

2014-01-01T23:59:59.000Z

351

Maintenance optimisation for wind turbines.  

E-Print Network [OSTI]

??Wind is becoming an increasingly important source of energy for countries that ratify to reduce the emission of greenhouse gases and mitigate the effects of… (more)

Andrawus, Jesse A.

2008-01-01T23:59:59.000Z

352

Analysis of the Performance of a Wind-Turbine Airfoil under Heavy-Rain Conditions Using a Multiphase Computational Fluid Dynamics Approach  

Science Journals Connector (OSTI)

These studies show that analyzing the performance of the wind-turbine airfoil under heavy-rain conditions is critical in evaluating the turbine efficiency and overall economic justification of wind farms with respect to the other alternative energy sources. ... The development of the energy generating costs of wind turbines directly depends on the wind turbine output, which depends upon the characteristics of the turbine blades and their surface roughness. ...

Ming Cai; Emadoddin Abbasi; Hamid Arastoopour

2012-11-21T23:59:59.000Z

353

Kivalina wind generator  

SciTech Connect (OSTI)

The project reported was to construct a system to harness the winds of an Arctic site to generate electricity that would power a greenhouse where fruit and vegetables could be raised for local consumption. The installation of the tower and an Enertech 4K wind generator are described. (LEW)

Aldrich, D.

1984-02-18T23:59:59.000Z

354

NREL: Wind Research - Ventera's VT 10 Turbine Testing and Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ventera's VT 10 Turbine Testing and Results Ventera's VT 10 Turbine Testing and Results Ventera's VT10 wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL is testing Ventera's VT10 small wind turbine at the National Wind Technology Center (NWTC). The VT10 is a horizontal-axis downwind, three-bladed turbine rated at 10 kilowatts (kW). Its diameter is 6.7 meters, and it is mounted on a lattice tower with a hub height of 21.7 meters. The VT10 uses a single-phase, grid-connected, permanent-magnet generator that operates at 240 volts AC. Testing Summary The summary of the tests is listed below, along with the final reports. Cumulative Energy Production 3/22/2010: 0; 3/29/2010: 26; 3/31/2010: 74; 4/1/2010: 75; 4/2/2010: 174;

355

Global potential for wind-generated electricity  

Science Journals Connector (OSTI)

...6 MW, deployed offshore, reflecting the greater...incentive to deploy larger turbines to capture the higher wind speeds available in...Electricity-Producing Wind Turbines ( International Electrotechnical...2008 ) Assessing offshore wind resources: An accessible...

Xi Lu; Michael B. McElroy; Juha Kiviluoma

2009-01-01T23:59:59.000Z

356

Identification of airfoil characteristics for optimum wind turbine performance / b  

E-Print Network [OSTI]

combine to determine how much power output is obtained. Oi' specific interest in this study is the influence of airi'oil section characteristics on horizontal axis wind turbine (HAWT) performance. By identifying these characteristics, better selection... characteristics f' or HAWT airfoil design or selection. EFFECT OF AIRFOIL CHARACTERISTICS ON INTEGRATED TURBINE PERFORMANCE Wind Turbine Performance Com uter Pro ram An existing horizontal axis wind turbine (HAWT) performance computer program" was modified f...

Miller, Leonard Scott

1983-01-01T23:59:59.000Z

357

WIND-TUNNEL STUDY ON AERODYNAMIC PERFORMANCE OF SMALL VERTICAL-AXIS WIND TURBINES  

E-Print Network [OSTI]

1 WIND-TUNNEL STUDY ON AERODYNAMIC PERFORMANCE OF SMALL VERTICAL-AXIS WIND TURBINES J. J. Miau*1 were carried out to study the aerodynamic performance of three vertical axis wind turbines (VAWTs. On the other hand, the characteristics of unsteady flow around the helical wind turbine were studied with a hot

Leu, Tzong-Shyng "Jeremy"

358

Probabilistic fatigue methodology and wind turbine reliability  

SciTech Connect (OSTI)

Wind turbines subjected to highly irregular loadings due to wind, gravity, and gyroscopic effects are especially vulnerable to fatigue damage. The objective of this study is to develop and illustrate methods for the probabilistic analysis and design of fatigue-sensitive wind turbine components. A computer program (CYCLES) that estimates fatigue reliability of structural and mechanical components has been developed. A FORM/SORM analysis is used to compute failure probabilities and importance factors of the random variables. The limit state equation includes uncertainty in environmental loading, gross structural response, and local fatigue properties. Several techniques are shown to better study fatigue loads data. Common one-parameter models, such as the Rayleigh and exponential models are shown to produce dramatically different estimates of load distributions and fatigue damage. Improved fits may be achieved with the two-parameter Weibull model. High b values require better modeling of relatively large stress ranges; this is effectively done by matching at least two moments (Weibull) and better by matching still higher moments. For this purpose, a new, four-moment {open_quotes}generalized Weibull{close_quotes} model is introduced. Load and resistance factor design (LRFD) methodology for design against fatigue is proposed and demonstrated using data from two horizontal-axis wind turbines. To estimate fatigue damage, wind turbine blade loads have been represented by their first three statistical moments across a range of wind conditions. Based on the moments {mu}{sub 1}{hor_ellipsis}{mu}{sub 3}, new {open_quotes}quadratic Weibull{close_quotes} load distribution models are introduced. The fatigue reliability is found to be notably affected by the choice of load distribution model.

Lange, C.H. [Stanford Univ., CA (United States)

1996-05-01T23:59:59.000Z

359

SAR-BASED WIND CLIMATOLOGY FOR WIND TURBINES Merete Bruun Christiansen(1)  

E-Print Network [OSTI]

of interest. 1. OFFSHORE WIND ENERGY Wind turbines are being installed at offshore locations in severalSAR-BASED WIND CLIMATOLOGY FOR WIND TURBINES Merete Bruun Christiansen(1) , Charlotte Bay Hasager(1 the offshore wind climate of Denmark. A new tool has been built to bridge the gap between ocean wind retrievals

360

Predicting aerodynamic characteristic of typical wind turbine airfoils using CFD  

SciTech Connect (OSTI)

An investigation was conducted into the capabilities and accuracy of a representative computational fluid dynamics code to predict the flow field and aerodynamic characteristics of typical wind-turbine airfoils. Comparisons of the computed pressure and aerodynamic coefficients were made with wind tunnel data. This work highlights two areas in CFD that require further investigation and development in order to enable accurate numerical simulations of flow about current generation wind-turbine airfoils: transition prediction and turbulence modeling. The results show that the laminar-to turbulent transition point must be modeled correctly to get accurate simulations for attached flow. Calculations also show that the standard turbulence model used in most commercial CFD codes, the k-e model, is not appropriate at angles of attack with flow separation. 14 refs., 28 figs., 4 tabs.

Wolfe, W.P. [Sandia National Labs., Albuquerque, NM (United States); Ochs, S.S. [Iowa State Univ., Ames, IA (United States). Aerospace Engineering Dept.

1997-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Trailing edge noise mitigation investigation for wind turbine blades  

Science Journals Connector (OSTI)

Wind turbines offer one of the most mature technologies for providing large scale renewable energy to society in an economically viable way. Although not on par with the price of conventional energy sources yet the cost of energy has been steadily decreasing as the technology continues to develop. Unfortunately like with all energy sources there are some problems with this form of generation. Among these sound emissions from wind turbines are one of the problems people who live close to the installed machines may be exposed to. Past studies show that these noise emissions are dominated by aeroacousticnoise and of the many mechanisms that lead to aeroacousticnoise the interaction between the unsteady flow and the trailing edge seems to constitute the largest portion of the overall sound spectrum. Modifications to the trailing edge geometry will change how the fluid interacts with the trailing edge and can be used to change the resulting noise emission. This study will investigate the effect passive trailing edge devices have on the overall noise emission from a wind turbine in an attempt to reduce the aeroacousticnoise being generated by the turbine.

Michael J. Asheim; Dave Munoz; Patrick Moriarty

2012-01-01T23:59:59.000Z

362

STRUCTURAL HEALTH MONITORING OF THE SUPPORT STRUCTURE OF WIND TURBINE USING WIRELESS SENSING SYSTEM  

E-Print Network [OSTI]

structure to resist the complicated environmental loading, especially for the offshore wind turbine. How efficiency of wind turbine, the development of offshore wind farm is in full swing. The wind turbine heavily, especially for the offshore wind turbine. How to manage these wind turbines and monitor the structural safety

Boyer, Edmond

363

Property:WindTurbineManufacturer | Open Energy Information  

Open Energy Info (EERE)

WindTurbineManufacturer WindTurbineManufacturer Jump to: navigation, search This is a property of type Page. Pages using the property "WindTurbineManufacturer" Showing 25 pages using this property. (previous 25) (next 25) 3 3-D Metals + Northern Power Systems + A AB Tehachapi Wind Farm + Vestas + AFCEE MMR Turbines + GE Energy + AG Land 1 + GE Energy + AG Land 2 + GE Energy + AG Land 3 + GE Energy + AG Land 4 + GE Energy + AG Land 5 + GE Energy + AG Land 6 + GE Energy + AVTEC + Northern Power Systems + Adair Wind Farm I + Vestas + Adair Wind Farm II + Siemens + Adams Wind Project + Alstom + Aeroman Repower Wind Farm + GE Energy + Affinity Wind Farm + Suzlon Energy Company + Agassiz Beach Wind Farm + Vestas + Agriwind Wind Farm + Suzlon Energy Company + Ainsworth Wind Energy Facility + Vestas +

364

NREL Releases RFP for Distributed Wind Turbine Competitiveness Improvement Projects  

Broader source: Energy.gov [DOE]

In support of DOE's efforts to further develop distributed wind technology, NREL's National Wind Technology Center has released a Request for Proposal for the following Distributed Wind Turbine Competitiveness Improvement Projects on the Federal Business

365

Suppression of the vibrations of wind turbine towers  

Science Journals Connector (OSTI)

......renewable and clean energy, wind power is rapidly increasing its...capacity in many countries. Large offshore turbines are subjected to severe...2002) Dynamic modeling of wind farm grid interaction. Wind Eng., 26, 191208. LITTMAN......

Xiaowei Zhao; George Weiss

2011-09-01T23:59:59.000Z

366

A $5 Million Boost for Midsize Wind Turbines and Grid Connectivity |  

Broader source: Energy.gov (indexed) [DOE]

A $5 Million Boost for Midsize Wind Turbines and Grid Connectivity A $5 Million Boost for Midsize Wind Turbines and Grid Connectivity A $5 Million Boost for Midsize Wind Turbines and Grid Connectivity September 14, 2010 - 10:52am Addthis Niketa Kumar Niketa Kumar Public Affairs Specialist, Office of Public Affairs What does this mean for me? With better forecasting, utilities can more reliably connect variable power sources such as wind energy with electricity grids, and can decrease their need for back-up energy sources such as natural gas and hydropower. Last week's Geek-Up talked about the Energy Department's Wind for Schools program and how it is helping schools use wind turbines to power their classrooms. Yesterday, U.S. Energy Secretary Steven Chu announced more than $5 million in funding to help bring wind-generated power to not only more

367

Flapping wing applied to wind generators  

Science Journals Connector (OSTI)

The new conditions at the international level for energy source distributions and the continuous increasing of energy consumption must lead to a new alternative resource with the condition of keeping the environment clean. This paper offers a new approach for a wind generator and is based on the theoretical aerodynamic model. This new model of wind generator helped me to test what influences would be if there will be a bird airfoil instead of a normal wind generator airfoil. The aim is to calculate the efficiency for the new model of wind generator. A representative direction for using the renewable energy is referred to the transformation of wind energy into electrical energy with the help of wind turbines; the development of such systems lead to new solutions based on high efficiency reduced costs and suitable to the implementation conditions.

Alexandra Colidiuc; Stelian Galetuse; Bogdan Suatean

2012-01-01T23:59:59.000Z

368

Structural efficiency of a wind turbine blade  

Science Journals Connector (OSTI)

Alternative structural layouts for wind turbine blades are investigated with the aim of improving their design, minimizing weight and reducing the cost of wind energy. New concepts were identified using topology optimization techniques on a 45 m wind turbine blade. Additionally, non-dimensional structural shape factors were developed for non-symmetric sections under biaxial bending to evaluate structural concepts in terms of ability to maximize stiffness and minimize stress. The topology optimization evolves a structure which transforms along the length of the blade, changing from a design with spar caps at the maximum thickness and a trailing edge mass, to a design with offset spar caps toward the tip. The shape factors indicate that the trailing edge reinforcement and the offset spar cap topology are both more efficient at maximizing stiffness and minimizing stress. In summary, an alternative structural layout for a wind turbine blade has been found and structural shape factors have been developed, which can quantitatively assess the structural efficiency under asymmetric bending.

Neil Buckney; Alberto Pirrera; Steven D. Green; Paul M. Weaver

2013-01-01T23:59:59.000Z

369

Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade  

E-Print Network [OSTI]

consequent impacts on wind turbine and wind energy pricing.Bloomberg NEF”). 2011c. Wind Turbine Price Index, Issue V.Understanding Trends in Wind Turbine Prices Over the Past

Bolinger, Mark

2013-01-01T23:59:59.000Z

370

Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade  

E-Print Network [OSTI]

impacts on wind turbine and wind energy pricing. ReferencesProduction from a V112 Turbine Wind Plant. Prepared forBloomberg NEF”). 2011c. Wind Turbine Price Index, Issue V.

Bolinger, Mark

2013-01-01T23:59:59.000Z

371

Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development  

SciTech Connect (OSTI)

Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at the request of the University of Maine, and with the support of the U.S. Department of Energy Wind Program, modeled the acoustic output of the planned test turbines.

Aker, Pamela M.; Jones, Anthony M.; Copping, Andrea E.

2010-11-23T23:59:59.000Z

372

Wind turbine tower for storing hydrogen and energy  

DOE Patents [OSTI]

A wind turbine tower assembly for storing compressed gas such as hydrogen. The tower assembly includes a wind turbine having a rotor, a generator driven by the rotor, and a nacelle housing the generator. The tower assembly includes a foundation and a tubular tower with one end mounted to the foundation and another end attached to the nacelle. The tower includes an in-tower storage configured for storing a pressurized gas and defined at least in part by inner surfaces of the tower wall. In one embodiment, the tower wall is steel and has a circular cross section. The in-tower storage may be defined by first and second end caps welded to the inner surface of the tower wall or by an end cap near the top of the tower and by a sealing element attached to the tower wall adjacent the foundation, with the sealing element abutting the foundation.

Fingersh, Lee Jay (Westminster, CO)

2008-12-30T23:59:59.000Z

373

Structural-borne sound mitigation in small wind turbines using constrained viscoelastic layer  

Science Journals Connector (OSTI)

As the growing acceptance of small wind turbines operating in suburban and rural communities coincides with increasingly stringent regulations on the sound emitted by these turbines the need for sound mitigation solutions becomes urgent. Small turbines need to be affordable for small business use and thus proposed solutions must be cost-effective and low maintenance. Easy retrofit to existing turbines is also desirable. Wind turbines generate sound via two main mechanisms: structural borne sound generated by the gearbox and generator and transmitted through the nacelle structure and aeroacoustic sound generated by the interaction of the airstream with the rotating blades and other turbine components. Current study focused on the mitigation of structural-borne sound in a 50 kW wind turbine using a constrained viscoelastic layer. The viscoelastic layer comprised of multiple tiles with normal force to the nacelle structure provided by ratcheting bands. Optimal value for the normal force was empirically determined and the resulting reductions in generated sound were documented both in the laboratory and on a working turbine under a number of operating conditions. The result is a cost-effective solution with zero cost of ownership and easy installation on a wide range of small to medium-size wind turbines.

Nic Strum; David Sampson; Ali Kheirabadi

2013-01-01T23:59:59.000Z

374

Generating Resources Combined Cycle Combustion Turbine  

E-Print Network [OSTI]

turbine (s) Heat recovery steam generator (s) - HRSG with or without duct firing Natural gas supply11/17/2014 1 Generating Resources Combined Cycle Combustion Turbine Utility Scale Solar PV Steven doing recently around two key supply-side resource technologies 1. Combined Cycle Combustion Turbine

375

Combining Droop Curve Concepts with Control Systems for Wind Turbine Active Power Control: Preprint  

SciTech Connect (OSTI)

Wind energy is becoming a larger portion of the global energy portfolio and wind penetration has increased dramatically in certain regions of the world. This increasing wind penetration has driven the need for wind turbines to provide active power control (APC) services to the local utility grid, as wind turbines do not intrinsically provide frequency regulation services that are common with traditional generators. It is common for large scale wind turbines to be decoupled from the utility grid via power electronics, which allows the turbine to synthesize APC commands via control of the generator torque and blade pitch commands. Consequently, the APC services provided by a wind turbine can be more flexible than those provided by conventional generators. This paper focuses on the development and implementation of both static and dynamic droop curves to measure grid frequency and output delta power reference signals to a novel power set point tracking control system. The combined droop curve and power tracking controller is simulated and comparisons are made between simulations using various droop curve parameters and stochastic wind conditions. The tradeoffs involved with aggressive response to frequency events are analyzed. At the turbine level, simulations are performed to analyze induced structural loads. At the grid level, simulations test a wind plant's response to a dip in grid frequency.

Buckspan, A.; Aho, J.; Pao, L.; Fleming, P.; Jeong, Y.

2012-06-01T23:59:59.000Z

376

Regional variations in the health, environmental, and climate benefits of wind and solar generation  

Science Journals Connector (OSTI)

...a 1-MW wind turbine will offset more...than a 1-MW solar installation...demand is high and gas is more often...resource, a wind turbine on the plains...emissions than a turbine in West Virginia...benefits when wind or solar displace coal...rather than gas-fired, generators...

Kyle Siler-Evans; Inęs Lima Azevedo; M. Granger Morgan; Jay Apt

2013-01-01T23:59:59.000Z

377

Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines  

E-Print Network [OSTI]

measurements of the wind fields engulfing today's huge wind turbines. Our aim is to measure in real- time 3D velocity field, ,within the volumes that fully surround the huge wind turbines of today and tomorrow atmospheric flow that surrounds the giant wind turbines. This new knowledge we envision will accelerate

378

Energy, emissions and environmental impact analysis of wind turbine using life cycle assessment technique  

Science Journals Connector (OSTI)

Abstract Wind turbine used for electricity generation is known as clean and renewable energy technology. The worldwide increasing trend of wind turbine installation present and future projection addressing the issue of energy required for manufacture and environmental impact due to energy consumption. The life cycle energy and environmental impact of wind turbine has been studied in many literature, but some studies are based on average data, the life cycle stages are incomplete of some study, most of the literature are horizontal axis type and the literature for Asian developing countries are rare. In addition, the life cycle study of vertical axis wind turbine is unusual. Since, the life cycle assessment (LCA) study varied from location to location due to industrial performance, countries energy mix and related issues, a life cycle embodied energy, emissions and environmental impacts analysis were undertaken for two grid connected rooftop wind turbines (vertical axis and horizontal axis) considering the industrial performance, applications and related issues in Thailand. The life cycle assessment was done using SimaPro 7.3.3 software from cradle to grave for base case and for alternative cases. The result showed that, wind turbine installation in Thailand at Chiangmai is reliable to deliver wind energy over the year compared to Phuket and Surat Thani Island. The vertical axis wind turbine is energy and emission intensive per kWh/year energy delivered compared to horizontal axis wind turbine for base case system. The embodied energy and environmental impact could be possible to reduce by more than 60% and 50% respectively using reuse of materials strategy. The embodied energy of vertical axis wind turbine could be possible to reduce by 36% with thermoplastic and 40% with fiberglass plastic turbine instead of aluminum turbine, while the environmental impact reduction more than 15% has been observed. The energy intensity, CO2 emission intensity and energy payback time found to be lower when compared with literature.

Md. Shazib Uddin; S. Kumar

2014-01-01T23:59:59.000Z

379

Utility Scale Wind turbine Demonstration Project  

SciTech Connect (OSTI)

The purpose of the Three Affiliated Tribes proposing to Department of Energy was nothing new to Denmark. National Meteorological Studies have proved that North Dakota has some of the most consistence wind resources in the world. The Three Affiliated Tribes wanted to assess their potential and become knowledgeable to developing this new and upcoming resource now valuable. By the Tribe implementing the Utility-scale Wind Turbine Project on Fort Berthold, the tribe has proven the ability to complete a project, and has already proceeded in a feasibility studies to developing a large-scale wind farm on the reservation due to tribal knowledge learned, public awareness, and growing support of a Nation wanting clean renewable energy. The tribe is working through the various measures and regulations with the want to be self-sufficient, independent, and marketable with 17,000 times the wind energy needed to service Fort Berthold alone.

Terry Fredericks

2006-03-31T23:59:59.000Z

380

Wear Analysis of Wind Turbine Gearbox Bearings  

SciTech Connect (OSTI)

The objective of this effort was to investigate and characterize the nature of surface damage and wear to wind turbine gearbox bearings returned from service in the field. Bearings were supplied for examination by S. Butterfield and J. Johnson of the National Wind Technology Center (NREL), Boulder, Colorado. Studies consisted of visual examination, optical and electron microscopy, dimensional measurements of wear-induced macro-scale and micro-scale features, measurements of macro- and micro-scale hardness, 3D imaging of surface damage, studies of elemental distributions on fracture surfaces, and examinations of polished cross-sections of surfaces under various etched and non-etched conditions.

Blau, Peter Julian [ORNL; Walker, Larry R [ORNL; Xu, Hanbing [ORNL; Parten, Randy J [ORNL; Qu, Jun [ORNL; Geer, Tom [ORNL

2010-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Root region airfoil for wind turbine  

DOE Patents [OSTI]

A thick airfoil is described for the root region of the blade of a wind turbine. The airfoil has a thickness in a range from 24%--26% and a Reynolds number in a range from 1,000,000 to 1,800,000. The airfoil has a maximum lift coefficient of 1.4--1.6 that has minimum sensitivity to roughness effects. 3 Figs.

Tangler, J.L.; Somers, D.M.

1995-05-23T23:59:59.000Z

382

The Influence of Turbulence and Vertical Wind Profile in Wind Turbine Power Curve  

Science Journals Connector (OSTI)

To identify the influence of turbulence and vertical wind profile in wind turbine performance, wind speed measurements at different heights have been ... equipment, specifically a pulsed wave one. The wind profil...

A. Honrubia; A. Vigueras-Rodríguez…

2012-01-01T23:59:59.000Z

383

Dynamic Simulation Studies of the Frequency Response of the Three U.S. Interconnections with Increased Wind Generation  

E-Print Network [OSTI]

wind turbine through a gearbox, and uses a conventional "squirrel cage" induction generator directly connected to the grid.

Mackin, Peter

2011-01-01T23:59:59.000Z

384

Dynamic modeling and direct power control of wind turbine driven DFIG under unbalanced network voltage conditions  

Science Journals Connector (OSTI)

This paper proposes an analysis and a direct power control (DPC) design of a wind turbine driven doubly-fed induction generator (DFIG) under unbalanced network voltage conditions. A DFIG model described in the po...

Jia-bing Hu; Yi-kang He; Lie Xu

2008-12-01T23:59:59.000Z

385

Is there a source of help for setting up real time wind turbine...  

Open Energy Info (EERE)

there a source of help for setting up real time wind turbine data reporting ? Home I'd like our students to be able to see historical data as well as real time power generation at...

386

Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting  

E-Print Network [OSTI]

envisioned floating offshore wind turbines. Finally, global35 ] For the three turbines considered, offshore wind farmsusable wind power is evaluated for modern offshore turbine

Capps, Scott B; Zender, Charles S

2010-01-01T23:59:59.000Z

387

DOE Seeking Proposals to Advance Distributed Wind Turbine Technology...  

Energy Savers [EERE]

Project (CIP). The CIP aims to help U.S. manufacturers of small and mid-sized wind turbines with rotor swept areas up to 1,000 square meters improve their turbine designs and...

388

Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine  

E-Print Network [OSTI]

MUFOWT analysis tool is able to compute any type of floating platform with various kinds of horizontal axis wind turbines (HAWT). Individual control of each turbine is also available and the different structural properties of tower and blades can...

Bae, Yoon Hyeok

2013-04-23T23:59:59.000Z

389

Modelling and analysis of a novel wind turbine structure  

Science Journals Connector (OSTI)

This study introduces a novel wind turbine structure for an urban environment. A computational modelling has been conducted to investigate the effect of the new structure on the flow behaviour of entrance wind through the structure and the feasibility of the new wind turbine working at different wind speeds in an urban area. The wind flow behaviour through a chamber of the wind turbine structure has resulted in an increase of 1.3 times of the wind velocity at the outlet of the wind turbine. This is equivalent to 2.5 times increase of wind energy. The wind tunnel tests were carried out to validate the simulation results. There is a good correlation between the experimental and computational results. It is evident that the presented computational method can predict and evaluate the performance of this new type of shroud structure in an urban environment.

Xu Zhang; Yong K. Chen; Rajnish K. Calay

2013-01-01T23:59:59.000Z

390

Trailing Edge Noise Model Applied to Wind Turbine Airfoils  

E-Print Network [OSTI]

flows, as well as the acoustic waves, using Computational Fluid Dynamics have become affordable thanksTrailing Edge Noise Model Applied to Wind Turbine Airfoils Franck Bertagnolio Risø-R-1633(EN) Risø Bertagnolio Title: Trailing Edge Noise Model Applied to Wind Turbine Airfoils Department: Wind Energy

391

AIAA-2001-0047 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE  

E-Print Network [OSTI]

. INTRODUCTION Design constraints for wind turbine structures fall into either extreme load or fatigue categoriesAIAA-2001-0047 1 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN Lance at Austin, Austin, TX 78712 2 Sandia National Laboratories, Wind Energy Technology Department, Albuquerque

Sweetman, Bert

392

PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN  

E-Print Network [OSTI]

loads. #12;2 INTRODUCTION Design constraints for wind turbine structures fall into either extreme load1 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN Lance Manuel1 Paul S, TX 78712 2 Sandia National Laboratories, Wind Energy Technology Department, Albuquerque, NM 87185

Sweetman, Bert

393

Small wind turbine emulator with armature controlled separately excited DC motor via analogue electronic circuit  

Science Journals Connector (OSTI)

In this paper, a small wind turbine emulator (WTE) using separately excited DC motor is modelled, designed, simulated, implemented and tested. A 1 HP separately excited DC motor is used to emulate the characteristics of the rotor of small wind turbine. The DC motor is driven by a thyristor bridge with closed-loop cascaded PI controller for armature control. A separately excited DC generator with a variable resistive load is directly coupled to the DC motor. A small cheap analogue electronic circuit, with less interfacing, is used to generate a specific reference wind turbine speed based on the wind turbine rotor characteristics and the mechanical wind power available. Simulation and experimental results are compared to proof the validity and accuracy of the WTE.

A. Mahdy; S.M. El-Hakim; Hanafy Hassan Hanafy

2012-01-01T23:59:59.000Z

394

Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1  

E-Print Network [OSTI]

Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1 , Gabriele Michalke2) wind turbines address primarily the design of DFIG wind turbine control with special focus on power strategy for DFIG wind turbines, which enhances the fault ride-through capability of DFIG wind turbines

395

Radar-cross-section reduction of wind turbines. part 1.  

SciTech Connect (OSTI)

In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustments, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not technically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techniques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

Brock, Billy C.; Loui, Hung; McDonald, Jacob J.; Paquette, Joshua A.; Calkins, David A.; Miller, William K.; Allen, Steven E.; Clem, Paul Gilbert; Patitz, Ward E.

2012-03-05T23:59:59.000Z

396

Massachusetts Wind Turbine Acoustics Research Project—Goals and preliminary results  

Science Journals Connector (OSTI)

The Commonwealth of Massachusetts (USA) has 43 operating wind turbine projects of 100 kW or more. At several of these projects noise complaints have been made to state authorities. The Massachusetts Clean Energy Center which provides funding for early stage analysis and development of wind power projects and the Massachusetts Department of Environmental Protection which regulates noise launched the project to increase understanding of (1) wind turbine acoustic impacts taking into account variables such as wind turbine size technology wind speed topography and distance and (2) the generation propagation and measurement of sound around wind turbine projects to inform policy-makers on how pre- and post-construction wind turbine noise studies should be conducted. This study involved the collection of detailed sound and meteorological data at five locations. The resulting database and interim reports contain information on infrasound and audible frequencies including amplitude modulation tonality and level. Analyses will include how the effects of wind shear and other variables may affect these parameters. Preliminary findings reflect the effects of meteorological conditions on wind turbine sound generation and propagation.

2014-01-01T23:59:59.000Z

397

Final Technical Report Recovery Act: Online Nonintrusive Condition Monitoring and Fault Detection for Wind Turbines  

SciTech Connect (OSTI)

The penetration of wind power has increased greatly over the last decade in the United States and across the world. The U.S. wind power industry installed 1,118 MW of new capacity in the first quarter of 2011 alone and entered the second quarter with another 5,600 MW under construction. By 2030, wind energy is expected to provide 20% of the U.S. electricity needs. As the number of wind turbines continues to grow, the need for effective condition monitoring and fault detection (CMFD) systems becomes increasingly important [3]. Online CMFD is an effective means of not only improving the reliability, capacity factor, and lifetime, but it also reduces the downtime, energy loss, and operation and maintenance (O&M) of wind turbines. The goal of this project is to develop novel online nonintrusive CMFD technologies for wind turbines. The proposed technologies use only the current measurements that have been used by the control and protection system of a wind turbine generator (WTG); no additional sensors or data acquisition devices are needed. Current signals are reliable and easily accessible from the ground without intruding on the wind turbine generators (WTGs) that are situated on high towers and installed in remote areas. Therefore, current-based CMFD techniques have great economic benefits and the potential to be adopted by the wind energy industry. Specifically, the following objectives and results have been achieved in this project: (1) Analyzed the effects of faults in a WTG on the generator currents of the WTG operating at variable rotating speed conditions from the perspective of amplitude and frequency modulations of the current measurements; (2) Developed effective amplitude and frequency demodulation methods for appropriate signal conditioning of the current measurements to improve the accuracy and reliability of wind turbine CMFD; (3) Developed a 1P-invariant power spectrum density (PSD) method for effective signature extraction of wind turbine faults with characteristic frequencies in the current or current demodulated signals, where 1P stands for the shaft rotating frequency of a WTG; (4) Developed a wavelet filter for effective signature extraction of wind turbine faults without characteristic frequencies in the current or current demodulated signals; (5) Developed an effective adaptive noise cancellation method as an alternative to the wavelet filter method for signature extraction of wind turbine faults without characteristic frequencies in the current or current demodulated signals; (6) Developed a statistical analysis-based impulse detection method for effective fault signature extraction and evaluation of WTGs based on the 1P-invariant PSD of the current or current demodulated signals; (7) Validated the proposed current-based wind turbine CMFD technologies through extensive computer simulations and experiments for small direct-drive WTGs without gearboxes; and (8) Showed, through extensive experiments for small direct-drive WTGs, that the performance of the proposed current-based wind turbine CMFD technologies is comparable to traditional vibration-based methods. The proposed technologies have been successfully applied for detection of major failures in blades, shafts, bearings, and generators of small direct-drive WTGs. The proposed technologies can be easily integrated into existing wind turbine control, protection, and monitoring systems and can be implemented remotely from the wind turbines being monitored. The proposed technologies provide an alternative to vibration-sensor-based CMFD. This will reduce the cost and hardware complexity of wind turbine CMFD systems. The proposed technologies can also be combined with vibration-sensor-based methods to improve the accuracy and reliability of wind turbine CMFD systems. When there are problems with sensors, the proposed technologies will ensure proper CMFD for the wind turbines, including their sensing systems. In conclusion, the proposed technologies offer an effective means to achieve condition-based smart maintenance for wind turbines and have a gre

Wei Qiao

2012-05-29T23:59:59.000Z

398

Global potential for wind-generated electricity  

Science Journals Connector (OSTI)

...individual wind farm involves...individual turbines, costs for...operations and maintenance (O&M...downtime for maintenance accounts...installed turbines reflecting the fact that maintenance is normally...relatively low wind conditions...

Xi Lu; Michael B. McElroy; Juha Kiviluoma

2009-01-01T23:59:59.000Z

399

Ris-R-1111(EN) Ultimate Loading of Wind Turbines  

E-Print Network [OSTI]

-R-1111(EN) 2 Abstract An extreme loading study has been conducted comprising a general wind climate the environmental wind climate. With the trend of persistently growing turbines, the extreme loading seems to become, and extreme wind events. Examples of extreme wind events are extreme mean wind speeds with a recurrence period

400

Investigation of Small Wind-Turbine Induction Generators : Final Technical Report, September 16, 1980-December 31, 1982.  

SciTech Connect (OSTI)

A new and accurate experimental set-up was developed to test induction machines in the 1-5 kW range. Two single-phase induction generators were tested - the Enertech 1500 and Enertech 1800. A detailed mathematical model to evaluate the performance of single-phase induction generators was developed and documented in the form of a FORTRAN computer simulation program. Then the program was used to analyze the Enertech 1800 and the results were compared with the test results. (LEW)

Venkata, Subrahmanyam S.; Boardman, Ethan C.

1982-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


401

Sandia National Laboratories: wind turbines produce rated power  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

turbines produce rated power Increasing the Scaled Wind Farm Technology Facility's Power Production On April 7, 2014, in Energy, Facilities, News, News & Events, Partnership,...

402

Sandia National Laboratories: Wind-Turbine Blade Materials and...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Demonstration Wind-Turbine Blade Materials and Reliability Progress On May 21, 2014, in Energy, Materials Science, News, News & Events, Partnership, Renewable Energy,...

403

WINDExchange Webinar: Small and Distributed Wind Turbine Update  

Broader source: Energy.gov [DOE]

Save the date for this free webinar presenting an overview of recent news and updates pertaining to small and distributed wind turbines.

404

WINDExchange Webinar: Small and Distributed Wind Turbine Update...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

an overview of recent news and updates pertaining to small and distributed wind turbines. Bret Barker, U.S. Department of Energy, will present a DOE program overview,...

405

SMART Wind Turbine Rotor: Design and Field Test  

Broader source: Energy.gov [DOE]

Design and field test results from the SMART Rotor project, a wind turbine rotor with integrated trailing-edge flaps designed for active control of the rotor aerodynamics.

406

Sandia National Laboratories: Siting: Wind Turbine/Radar Interference...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and MIT Lincoln Laboratory). The goal is to overcome interference caused by wind turbines on civilian and military radar systems by developing site planning tools,...

407

INTERAGENCY FIELD TEST & EVALUATION OF WIND TURBINE - RADAR INTERFEREN...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

the tests and 2) summaries of three field tests designed to measure the impact of wind turbines on current air surveillance radars and the effectiveness of private sector...

408

Wind Turbine Inspection Technology Reaches New Heights | GE Global...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

week, we announced our advancement in technology that will make the inspection of wind turbines faster and more reliable for our customers. Currently, an inspector examines the...

409

SMART Wind Turbine Rotor: Data Analysis and Conclusions  

Broader source: Energy.gov [DOE]

Data analysis and conclusions from the SMART Rotor project, a wind turbine rotor with integrated trailing-edge flaps designed for active control of the rotor aerodynamics.

410

Supercomputer Helps Design Wind Turbines | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Supercomputer Helps Design Wind Turbines January 16, 2014 Since 2005, scientists at Oak Ridge National Laboratory have been researching, developing and testing materials in...

411

New Framework Transforms FAST Wind Turbine Modeling Tool (Fact...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

for modeling multisegmented mooring quasi-static behaviors of floating offshore wind turbines; and full conversion of FAST into the new modularization framework. Features of...

412

Load Reduction of Floating Wind Turbines using Tuned Mass Dampers.  

E-Print Network [OSTI]

??Offshore wind turbines have the potential to be an important part of the United States' energy production profile in the coming years. In order to… (more)

Stewart, Gordon M

2012-01-01T23:59:59.000Z

413

Pitch and torque control of variable speed wind turbines.  

E-Print Network [OSTI]

??In this thesis the torque, speed and pitch angle control of variable speed wind turbine is investigated. In particular, it concentrates on the extraction of… (more)

Kulka, Arkadiusz

2004-01-01T23:59:59.000Z

414

Wind Turbine Manufacturers in the U. S.: Locations and Local...  

Wind Powering America (EERE)

Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Wind Turbine Manufacturers in the U.S.: Locations and Local Impacts WINDPOWER 2010 Conference...

415

Application of machine learning technique in wind turbine fault diagnosis.  

E-Print Network [OSTI]

??In this study, a machine learning technique called anomaly detection is employed for wind turbine bearing fault detection. Basically, the anomaly detection algorithm is used… (more)

Purarjomandlangrudi, Afrooz

2014-01-01T23:59:59.000Z

416

Sandia National Laboratories: wind-turbine blade construction  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Doppler Velocimeter EC Top Publications A Comparison of Platform Options for Deep-water Floating Offshore Vertical Axis Wind Turbines: An Initial Study Nonlinear Time-Domain...

417

Dynamic simulation on collision between ship and offshore wind turbine  

Science Journals Connector (OSTI)

By using ABAQUS/Explicit, the dynamic process of an offshore wind turbine(OWT) stricken by a ship of 5000DWT...

Hongyan Ding ???; Qi Zhu ? ?; Puyang Zhang ???

2014-02-01T23:59:59.000Z

418

Optimal Evolutionary Wind Turbine Placement in Wind Farms Considering New Models of Shape, Orography and Wind Speed Simulation  

Science Journals Connector (OSTI)

In this paper we present a novel evolutionary algorithm for optimal positioning of wind turbines in wind farms. We consider a realistic model for the wind farm, which includes orography, shape of the wind farm, s...

B. Saavedra-Moreno; S. Salcedo-Sanz…

2011-01-01T23:59:59.000Z

419

Robust STATCOM control for the stabilisation of fixed-speed wind turbines during low voltages  

E-Print Network [OSTI]

and rotor- speed instability and more so if the wind turbine is connected to a weak grid. To prevent is still being produced by squirrel-cage induction generators (SCIGs) which are directly connected to the grid and operate at an almost fixed-speed [3]. They are advantageous as wind generators for their low

Pota, Himanshu Roy

420

NREL: Awards and Honors - North Wind 100/20 Wind Turbine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

North Wind 100/20 Wind Turbine North Wind 100/20 Wind Turbine Developers: Gerry Nix and Brian Smith, National Renewable Energy Laboratory; Johnathan Lynch, Clint Coleman, Garrett Bywaters, and Rob Roland, Norhtern Power Systems; Dr. David Bubenheim and Michael Flynn, NASA Ames Research Center; and John Rand, National Science Foundation. The North Wind 100/20 Wind Turbine is a state-of-the-art wind turbine that is ideal for extreme cold conditions perfect for remote locations that may be off-grid or local-grid. The numeric designations represent the North Wind's capacity, 100-kilowatts (which is enough energy for 25-50 homes), and 20-meter diameter blades. The size of the North Wind 100/20 is unique, fitting an important market niche between large and small turbines. Large turbines (400-kilowatts and

Note: This page contains sample records for the topic "wind turbines generate" 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

DAMAGE DETECTION METHODS ON WIND TURBINE BLADE TESTING WITH WIRED AND WIRELESS ACCELEROMETER SENSORS  

E-Print Network [OSTI]

DAMAGE DETECTION METHODS ON WIND TURBINE BLADE TESTING WITH WIRED AND WIRELESS ACCELEROMETER for nonstationary blade excitations. KEYWORDS : Structural Health Monitoring, Damage Detection, Wind Turbine, Wireless sensing, Wavelets. INTRODUCTION Detecting damage in wind turbine blades is a very

Paris-Sud XI, Université de

422

The U.S. Department of Energy Wind Turbine Development Program  

SciTech Connect (OSTI)

The development of technologically-advanced wind turbines continues to be a high priority of the US wind industry. The United States Department of Energy (DOE) is sponsoring a range of projects that assist the wind industry to design, develop, and test new wind turbines. The overall goal is to develop turbines that can compete with conventional electric generation with a cost of energy (COE) of 5 cents/kWh at 5.8 m/s (13 mph sites) by the mid-1990s and with a cost of energy of 4 cents/kWh or less at 5.8 m/s sites by the year 2000. These goals will be supported through the DOE Turbine Development Program. The Turbine Development Program uses a two-path approach. The first path assists US industry to develop and integrate innovative technologies into utility-grade wind turbines for the near-term (mid-1990s). The second path assists industry to develop a new generation of turbines for the year 2000. This paper describes present and planned projects under the Turbine Development Program.

Link, H.; Laxson, A.; Smith, B. [National Renewable Energy Lab., Golden, CO (United States); Goldman, P. [Dept. of Energy, Washington, DC (United States)

1995-03-01T23:59:59.000Z

423

Development of Fully Coupled Aeroelastic and Hydrodynamic Models for Offshore Wind Turbines: Preprint  

SciTech Connect (OSTI)

Aeroelastic simulation tools are routinely used to design and analyze onshore wind turbines, in order to obtain cost effective machines that achieve favorable performance while maintaining structural integrity. These tools employ sophisticated models of wind-inflow; aerodynamic, gravitational, and inertial loading of the rotor, nacelle, and tower; elastic effects within and between components; and mechanical actuation and electrical responses of the generator and of control and protection systems. For offshore wind turbines, additional models of the hydrodynamic loading in regular and irregular seas, the dynamic coupling between the support platform motions and wind turbine motions, and the dynamic characterization of mooring systems for compliant floating platforms are also important. Hydrodynamic loading includes contributions from hydrostatics, wave radiation, and wave scattering, including free surface memory effects. The integration of all of these models into comprehensive simulation tools, capable of modeling the fully coupled aeroelastic and hydrodynamic responses of floating offshore wind turbines, is presented.

Jonkman, J. M.; Sclavounos, P. D.

2006-01-01T23:59:59.000Z

424

Impacts of Providing Inertial Response on Dynamic Loads of Wind Turbine Drivetrains: Preprint  

SciTech Connect (OSTI)

There has been growing demand from the power industry for wind power plants to support power system operations. One such requirement is for wind turbines to provide ancillary services in the form of inertial response. When the grid frequency drops, it is essential for wind turbine generators (WTGs) to inject kinetic energy stored in their inertia into the grid to help arrest the frequency decline. However, the impacts of inertial response on the structural loads of the wind turbine have not been given much attention. To bridge this gap, this paper utilizes a holistic model for both fixed-speed and variable-speed WTGs by integrating the aeroelastic wind turbine model in FAST, developed by the National Renewable Energy Laboratory, with the electromechanical drivetrain model in SimDriveline and SimPowerSystems.

Girsang, I. P.; Dhupia, J.; Singh, M.; Gevorgian, V.; Muljadi, E.; Jonkman, J.

2014-09-01T23:59:59.000Z

425

MODELING WIND TURBINES IN THE GRIDLAB-D SOFTWARE ENVIRONMENT  

SciTech Connect (OSTI)

In recent years, the rapid expansion of wind power has resulted in a need to more accurately model the effects of wind penetration on the electricity infrastructure. GridLAB-D is a new simulation environment developed for the U.S. Department of Energy (DOE) by the Pacifi c Northwest National Laboratory (PNNL), in cooperation with academic and industrial partners. GridLAB-D was originally written and designed to help integrate end-use smart grid technologies, and it is currently being expanded to include a number of other technologies, including distributed energy resources (DER). The specifi c goal of this project is to create a preliminary wind turbine generator (WTG) model for integration into GridLAB-D. As wind power penetration increases, models are needed to accurately study the effects of increased penetration; this project is a beginning step at examining these effects within the GridLAB-D environment. Aerodynamic, mechanical and electrical power models were designed to simulate the process by which mechanical power is extracted by a wind turbine and converted into electrical energy. The process was modeled using historic atmospheric data, collected over a period of 30 years as the primary energy input. This input was then combined with preliminary models for synchronous and induction generators. Additionally, basic control methods were implemented, using either constant power factor or constant power modes. The model was then compiled into the GridLAB-D simulation environment, and the power outputs were compared against manufacturers’ data and then a variation of the IEEE 4 node test feeder was used to examine the model’s behavior. Results showed the designs were suffi cient for a prototype model and provided output power similar to the available manufacturers’ data. The prototype model is designed as a template for the creation of new modules, with turbine-specifi c parameters to be added by the user.

Fuller, J.C.; Schneider, K.P.

2009-01-01T23:59:59.000Z

426

Remanufacturing: An Alternative for End of Use of Wind Turbines  

Science Journals Connector (OSTI)

The fast expansion of the wind power industry has positioned wind turbines (WTs) as a low environmental impact technology with a promising future. Although the useful life of WTs is relatively long, since 2005...

Katherine Ortegon; Loring F. Nies…

2012-01-01T23:59:59.000Z

427

Lessons Learned: Milwaukee’s Wind Turbine Project  

Office of Energy Efficiency and Renewable Energy (EERE)

U.S. Department of Energy Community and Renewable Energy Success Stories webinar series titled Wind Energy in Urban Environments. This presentation describes a mid-size wind turbine installation near downtown Milwaukee, Wisconsin.

428

Gamesa Installs 2-MW Wind Turbine at NWTC  

Broader source: Energy.gov [DOE]

In October, the Department of Energy (DOE) National Renewable Laboratory (NREL) worked with Gamesa Wind US to complete the installation of Gamesa's G97-2 MW Class IIIA turbine at NREL's National Wind Technology Center.

429

Dynamic analysis of a 5 megawatt offshore floating wind turbine  

E-Print Network [OSTI]

September 2007. 5. "Hywind – the World’s First Full-scaleOffshore/Hywind/Pages/HywindPuttingWindPowerToTheTest. aspx4 Figure 1.3: Hywind concept floating wind turbine [

Harriger, Evan Michael

2011-01-01T23:59:59.000Z

430

SMART Wind Turbine Rotor: Data Analysis and Conclusions  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

system HP high-pressure (the nominally upwind surface of a HAWT blade) IMU inertial measurement unit inboard toward the root end of a wind turbine blade LE leading edge of wind...

431

Effect of Surface Roughness on Wind Turbine Performance  

E-Print Network [OSTI]

Wind farm operators observe production deficits as machines age. Quantifying deterioration on individual components is difficult, but one potential explanation is accumulation of blade surface roughness. Historically, wind turbine airfoils were...

Ehrmann, Robert Schaefer

2014-06-25T23:59:59.000Z

432

Dynamic characteristics analysis of the offshore wind turbine blades  

Science Journals Connector (OSTI)

The topic of offshore wind energy is attracting more and more attention ... . The blades are the key components of offshore wind turbines, and their dynamic characteristics directly determine the effectiveness of...

Jing Li; Jianyun Chen; Xiaobo Chen

2011-03-01T23:59:59.000Z

433

Condition Monitoring Benefit for Operation Support of Offshore Wind Turbines  

Science Journals Connector (OSTI)

As more offshore wind parks are commissioned, the focus will inevitably ... case, both short-term risks associated with wind turbine component assemblies, and long-term risks related...

Dr. Sebastian Thöns; Dr. David McMillan

2014-01-01T23:59:59.000Z

434

A Fault Tolerant Control Approach to Sustainable Offshore Wind Turbines  

Science Journals Connector (OSTI)

The main challenges for the deployment of wind turbine systems are to maximise the amount of good quality electrical power extracted from wind energy. This must be ensured over a ... to maintain system sustainabi...

Montadher Sami Shaker; Ron J. Patton

2014-01-01T23:59:59.000Z

435

Multi-piece wind turbine rotor blades and wind turbines incorporating same  

DOE Patents [OSTI]

A multisection blade for a wind turbine includes a hub extender having a pitch bearing at one end, a skirt or fairing having a hole therethrough and configured to mount over the hub extender, and an outboard section configured to couple to the pitch bearing.

Moroz; Emilian Mieczyslaw (San Diego, CA) [San Diego, CA

2008-06-03T23:59:59.000Z

436

Integral variable structure current control of DFIG-based wind turbines near cut-in speed  

Science Journals Connector (OSTI)

Based on the grid voltage orientated vector control technique, a novel integral variable structure controller for current control of variable speed doubly fed induction generator (DFIG) wind turbines near cut-in wind speed is proposed. The proposed current controller can not only ensure generators' safe cut-in switches to the grid, but also maximum energy capture after switch motion without any regulations. By these, simulations of a 1.5 MW DFIG-based wind turbine near cut-in wind speed are separately conducted under integral variable structure control (IVSC) and PI control. The results show that IVSC strategy, which gives better dynamic response, less static error, smaller controller output dithering, stronger global robustness against generator parameters uncertainty and the grid voltage fluctuation, as well as needless controller regulation after cutting-in the grid, obviously preponderates over traditional PI control for DFIG-based wind turbines near cut-in speed.

Changliang Xia; Huimin Wang; Zhanfeng Song

2009-01-01T23:59:59.000Z

437

NREL: News Feature - Giant Wind Turbine Test Takes a Heavyweight  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Giant Wind Turbine Test Takes a Heavyweight Giant Wind Turbine Test Takes a Heavyweight May 17, 2010 Photo of Samsung's 90-ton drive train connected to NREL's 2.5-megawatt dynamometer in a high-ceiling metal building. The drive train is a cylindrical shape, but several attachments give it the look of a giant Lego contraption. Enlarge image A coupling of giants: Samsung's 2.5-megawatt wind turbine drive train meets the National Wind Technology Center's 2.5-megawatt dynamometer. Samsung's drive train weighs 90 tons and is the brains behind its 2.5-megawatt wind turbine that can supply electricity to 1,800 homes. Credit: Rob Wallen In a coupling of giants recently, the 2.5-megawatt dynamometer at the U.S. Department of Energy's National Renewable Energy Laboratory blasted 12.6 million inch pounds of torque at Samsung's 185,000-pound wind turbine drive

438

Risk of collision between service vessels and offshore wind turbines  

Science Journals Connector (OSTI)

Offshore wind farms are growing in size and are situated farther and farther away from shore. The demand for service visits to transfer personnel and equipment to the wind turbines is increasing, and safe operation of the vessels is essential. Currently, collisions between service vessels and offshore wind turbines are paid little attention to in the offshore wind energy industry. This paper proposes a risk assessment framework for such collisions and investigates the magnitude of the collision risk and important risk-influencing factors. The paper concludes that collisions between turbines and service vessels even at low speed may cause structural damage to the turbines. There is a need for improved consideration of this kind of collision risk when designing offshore wind turbines and wind farms.

Lijuan Dai; Sören Ehlers; Marvin Rausand; Ingrid Bouwer Utne

2013-01-01T23:59:59.000Z

439

Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting  

E-Print Network [OSTI]

estimate of future floating turbine depths. [ 32 ] Theenvisioned floating offshore wind turbines. Finally, global

Capps, Scott B; Zender, Charles S

2010-01-01T23:59:59.000Z

440

Wind power generating system  

SciTech Connect (OSTI)

Normally feathered propeller blades of a wind power generating system unfeather in response to the actuation of a power cylinder that responds to actuating signals. Once operational, the propellers generate power over a large range of wind velocities. A maximum power generation design point signals a feather response of the propellers so that once the design point is reached no increase in power results, but the system still generates power. At wind speeds below this maximum point, propeller speed and power output optimize to preset values. The propellers drive a positive displacement pump that in turn drives a positive displacement motor of the swash plate type. The displacement of the motor varies depending on the load on the system, with increasing displacement resulting in increasing propeller speeds, and the converse. In the event of dangerous but not clandestine problems developing in the system, a control circuit dumps hydraulic pressure from the unfeathering cylinder resulting in a predetermined, lower operating pressure produced by the pump. In the event that a problem of potentially cladestine consequence arises, the propeller unfeathering cylinder immediately unloads. Upon startup, a bypass around the motor is blocked, applying a pressure across the motor. The motor drives the generator until the generator reaches a predetermined speed whereupon the generator is placed in circuit with a utility grid and permitted to motor up to synchronous speed.

Schachle, Ch.; Schachle, E. C.; Schachle, J. R.; Schachle, P. J.

1985-03-12T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" 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

Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine  

E-Print Network [OSTI]

Noise Operations of Wind Turbines on Neighbor Annoyance: ANoise Operations of Wind Turbines on Neighbor Annoyance: A

Hoen, Ben

2010-01-01T23:59:59.000Z

442

Collegiate Wind Competition Turbines go Blade-to-Blade in Wind...  

Office of Environmental Management (EM)

- 5:11pm Addthis This wind tunnel constructed by NREL engineers will test the small wind turbines designed by 10 university teams competing in DOE's Collegiate Wind Competition....

443

Wind Turbine Blade Flow Fields and Prospects for Active Aerodynamic Control: Preprint  

SciTech Connect (OSTI)

This paper describes wind turbine flow fields that can cause adverse aerodynamic loading and can impact active aerodynamic control methodologies currently contemplated for wind turbine applications.

Schreck, S.; Robinson, M.

2007-08-01T23:59:59.000Z

444

An investigation of design alternatives for 328-ft (100-m) tall wind turbine towers.  

E-Print Network [OSTI]

??As wind turbines are continued to be placed at higher elevations, the need for taller wind turbine towers becomes necessary. However, there are multiple challenges… (more)

Lewin, Thomas James

2010-01-01T23:59:59.000Z

445

Overview: Zoning for Small Wind Turbines  

Wind Powering America (EERE)

Overview: Overview: Zoning for Small Wind Turbines Jim Green NREL ASES Small Wind Division Webinar January 17, 2008 2 Zoning Basics * Zoning is one form of land use law * Based on legal principle of "police power:" the power to regulate in order to promote the health, morals, safety, and general welfare of the community * Zoning authority originates from state laws called "zoning enabling legislation" - Standard Zoning Enabling Act, Dept. of Commerce, 1920s * Enabling legislation delegates land use authority to local jurisdictions, "Home Rule" - counties, parishes, boroughs, townships, municipalities, cities, villages, etc. 3 Zoning is Daunting * 3,034 counties (National Association of Counties) * 16,504 townships * 19,429 municipalities (National League of Cities)

446

The right size matters: Investigating the offshore wind turbine market equilibrium  

Science Journals Connector (OSTI)

Abstract Although early experiences indicate that the maturity of deployed technology might not be sufficient for operating wind farms in large scale far away from shore, the rapid development of offshore wind energy is in full progress. Driven by the demand of customers and the pressure to keep pace with competitors, offshore wind turbine manufacturers continuously develop larger wind turbines instead of improving the present ones which would ensure reliability in harsh offshore environment. Pursuing the logic of larger turbines generating higher energy yield and therefore achieving higher efficiency, this trend is also supported by governmental subsidies under the expectation to bring down the cost of electricity from offshore wind. The aim of this article is to demonstrate that primarily due to the limited wind resource upscaling offshore wind turbines beyond the size of 10 MW (megawatt) is not reasonable. Applying the planning methodology of an offshore wind project developer to a case study wind farm in the German North Sea and assessing energy yield, lifetime project profitability and levelized cost of electricity substantiate this thesis. This is highly interesting for all stakeholders in the offshore wind industry and questions current subsidy policies supporting projects for developing turbines up to 20 MW.

Nikolaus Ederer

2014-01-01T23:59:59.000Z

447

Barr Engineering Statement of Methodology Rosemount Wind Turbine  

Broader source: Energy.gov (indexed) [DOE]

Barr Engineering Statement of Methodology Rosemount Wind Turbine Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOE/EA-1791 (May 2010) Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOE/EA-1791 (May 2010) Barr Engineering, Minneapolis engaged Truescape in May 2010 to: 1) Provide a series of TrueViewTM2 "human field of view" survey controlled photo simulations from pre-determined viewpoint locations to assist with the assessment of the potential visibility of a proposed turbine, and 2) Simulate two different height options for the turbine tower, being 80m vs. 100m. Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOE/EA-1791 (May 2010)

448

Barr Engineering Statement of Methodology Rosemount Wind Turbine  

Broader source: Energy.gov (indexed) [DOE]

Barr Engineering Statement of Methodology Rosemount Wind Turbine Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOE/EA-1791 (May 2010) Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOE/EA-1791 (May 2010) Barr Engineering, Minneapolis engaged Truescape in May 2010 to: 1) Provide a series of TrueViewTM2 "human field of view" survey controlled photo simulations from pre-determined viewpoint locations to assist with the assessment of the potential visibility of a proposed turbine, and 2) Simulate two different height options for the turbine tower, being 80m vs. 100m. Barr Engineering Statement of Methodology Rosemount Wind Turbine Simulations by Truescape Visual Reality, DOE/EA-1791 (May 2010)

449

Zhejiang Windey Wind Generating Engineering | Open Energy Information  

Open Energy Info (EERE)

Windey Wind Generating Engineering Windey Wind Generating Engineering Jump to: navigation, search Name Zhejiang Windey Wind Generating Engineering Place Zhejiang Province, China Zip 313200 Sector Wind energy Product Engaged in the marketing, technical development of wind turbines, quality control, assembly and after sales service. References Zhejiang Windey Wind Generating Engineering[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Zhejiang Windey Wind Generating Engineering is a company located in Zhejiang Province, China . References ↑ "Zhejiang Windey Wind Generating Engineering" Retrieved from "http://en.openei.org/w/index.php?title=Zhejiang_Windey_Wind_Generating_Engineering&oldid=353509"

450

Assessing Novel Foundation Options for Offshore Wind Turbines  

E-Print Network [OSTI]

Assessing Novel Foundation Options for Offshore Wind Turbines B.W. Byrne, BE(Hons), BCom, MA, DPhil G.T. Houlsby, MA, DSc, FREng, FICE Oxford University, UK SYNOPSIS Offshore wind farms of these being the foundations for the offshore turbines. We review here the results of a recent research

Byrne, Byron

451

Scour around an offshore wind turbine W.F. Louwersheimer  

E-Print Network [OSTI]

Scour around an offshore wind turbine MSc Thesis W.F. Louwersheimer January, 2007 Delft University of Technology Ballast Nedam Faculty of Civil Engineering Egmond Offshore Energy Section of Hydraulic Engineering #12;Scour around an offshore wind turbine Delft University of Technology Ballast Nedam - Egmond

Langendoen, Koen

452

Reinforced Wind Turbine Blades - An Environmental Life Cycle Evaluation  

Science Journals Connector (OSTI)

Methods for producing wind turbines and the foundations for offshore installation are not expected to change much before the year 2025. ... Benchmark LCA data from Ecoinvent for a 2 MW offshore horizontal axis wind turbine was selected with capacity factor of 30% and lifespan of 20 years. ...

Laura Merugula; Vikas Khanna; Bhavik R. Bakshi

2012-08-02T23:59:59.000Z

453

Influence of wind characteristics on turbine performance Ioannis Antoniou (1)  

E-Print Network [OSTI]

(2) , Peder Enevoldsen (2) , Leo Thesbjerg (3) (1): Wind Energy Department, Risø of measuring the power curve is by using the wind speed at hub height. The assumption behind this is that the wind speed is representative of the wind over the whole turbine rotor. While this assumption

454

Can Wind Turbines be Bad for You? Alec N. Salt, Ph.D.  

E-Print Network [OSTI]

Can Wind Turbines be Bad for You? Alec N. Salt, Ph.D. Department of Otolaryngology there happens to be a castle nearby). #12;Wind turbines haveWind turbines have been getting biggerbeen getting MegaWatts(MW) Total Installed Change by year 3% of US Energy Needs Wind turbines are "green" and areWind

Salt, Alec N.

455

Infrasound, the Ear and Wind Turbines Alec N. Salt, Ph.D.  

E-Print Network [OSTI]

Infrasound, the Ear and Wind Turbines Alec N. Salt, Ph.D. Department of Otolaryngology there happens to be a castle nearby). #12;Wind turbines haveWind turbines have been getting biggerbeen getting MegaWatts(MW) Total Installed Change by year 3% of US Energy Needs Wind turbines are "green" and areWind

Salt, Alec N.

456

NREL: Wind Research - Viryd Technologies' CS8 Turbine Testing and Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Viryd Technologies' CS8 Turbine Testing and Results Viryd Technologies' CS8 Turbine Testing and Results Viryd Technologies CS8 wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL is testing Viryd Technologies' CS8 small wind turbine at the National Wind Technology Center (NWTC). The CS8 is an upwind, horizontal-axis, three-bladed, stall controlled turbine rated at 8 kilowatts (kW). It has an 8.5-meter rotor diameter and is mounted on a guyed tilt-up lattice tower with a hub height of 24.9 meters. The CS8 uses a single-phase, grid-connected, induction generator that operates at 240 volts AC. Testing Summary Supporting data and explanations for data included in this table are provided in the final reports.

457

Wind turbine aerodynamics: analysis and design  

Science Journals Connector (OSTI)

In this paper, the classical work on wind turbine is reviewed, starting from the ground work of Rankine and Froude, then revisiting the minimum energy condition of Betz, and applying modern computing techniques to build codes, based on the vortex model of Goldstein that are both fast and reliable. Such numerical simulations can be used to help analyse and design modern wind turbines in regimes where the flow is attached. Much of the work has been developed under the impulsion of General Electric whose support is gratefully acknowledged. The vortex model has reached a mature state which includes capabilities to model unsteady flows due to yaw, tower interference and earth boundary layer as well as flows past rotors with advanced blade tips that have sweep and/or winglets. When separation occurs on the blades, a higher fidelity model is presented, called the hybrid method, which consists in coupling a Navier-Stokes solver with the vortex model, the Navier-Stokes code solving the near blade flow whereas the vortex model convects the circulation to the far field without dissipation and allows for accurate representation of the induced velocities. Further development of the vortex model includes its coupling with a blade structural model to perform aeroelasticity studies.

Jean-Jacques Chattot

2011-01-01T23:59:59.000Z

458

Tax Exemption for Wind Energy Generation | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Tax Exemption for Wind Energy Generation Tax Exemption for Wind Energy Generation Tax Exemption for Wind Energy Generation < Back Eligibility Utility Savings Category Wind Buying & Making Electricity Program Info Start Date 7/2001 State West Virginia Program Type Corporate Exemption Rebate Amount Reduction of Business and Occupations (BandO) tax from 40% to 12% of generating capacity Provider West Virginia Division of Energy In March 2007, West Virginia enacted legislation ([http://www.legis.state.wv.us/Bill_Text_HTML/2007_SESSIONS/RS/BILLS/sb441... SB 441]) amending its tax law concerning the business and operation (B&O) tax for wind turbines. Although SB 441 increased the taxable value of wind turbine generating capacity, the taxation level is still significantly lower than that of most other types of electricity generation. For most

459

International Turbine Research Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Turbine Research Wind Farm Turbine Research Wind Farm Jump to: navigation, search Name International Turbine Research Wind Farm Facility International Turbine Research Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Developer International Turbine Research Energy Purchaser Pacific Gas & Electric Co Location Pacheco Pass CA Coordinates 37.0445°, -121.175° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.0445,"lon":-121.175,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

460

Mid-Size Wind Turbines | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit History Facebook icon Twitter icon » Mid-Size Wind Turbines Jump to: navigation, search A Vergnet GEV MP C 275-kW turbine at the Sandywoods Community, Rhode island. Photo from Stefan Dominioni/Vergnet S.A., NREL 26490. The U.S. Department of Energy defines mid-size wind turbines as 101 kilowatts to 1 megawatt.[1] Resources Kwartin, R.; Wolfrum, A.; Granfield, K.; Kagel, A.; Appleton, A. (2008). An Analysis of the Technical and Economic Potential for Mid-Scale Distributed Wind. National Renewable Energy Laboratory. Accessed September 27, 2013. National Renewable Energy Laboratory. Midsize Wind Turbine Research. Accessed September 27, 2013. This webpage discusses efforts to develop and commercialize mid-size wind turbines in the United States. References

Note: This page contains sample records for the topic "wind turbines generate" 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

Development and Validation of an Aeroelastic Model of a Small Furling Wind Turbine: Preprint  

SciTech Connect (OSTI)

Small wind turbines often use some form of furling (yawing and/or tilting out of the wind) to protect against excessive power generation and rotor speeds in high winds.The verification study demonstrated the correct implementation of FAST's furling dynamics. During validation, the model tends to predict mean rotor speeds higher than measured in spite of the fact that the mean furl motion and rotor thrust are predicted quite accurately. This work has culminated with an enhanced version of FAST that should prove to be a valuable asset to designers of small wind turbines.

Jonkman, J. M.; Hansen, A. C.

2004-12-01T23:59:59.000Z

462

CgWind: A high-order accurate simulation tool for wind turbines and wind farms  

SciTech Connect (OSTI)

CgWind is a high-fidelity large eddy simulation (LES) tool designed to meet the modeling needs of wind turbine and wind park engineers. This tool combines several advanced computational technologies in order to model accurately the complex and dynamic nature of wind energy applications. The composite grid approach provides high-quality structured grids for the efficient implementation of high-order accurate discretizations of the incompressible Navier-Stokes equations. Composite grids also provide a natural mechanism for modeling bodies in relative motion and complex geometry. Advanced algorithms such as matrix-free multigrid, compact discretizations and approximate factorization will allow CgWind to perform highly resolved calculations efficiently on a wide class of computing resources. Also in development are nonlinear LES subgrid-scale models required to simulate the many interacting scales present in large wind turbine applications. This paper outlines our approach, the current status of CgWind and future development plans.

Chand, K K; Henshaw, W D; Lundquist, K A; Singer, M A

2010-02-22T23:59:59.000Z

463

A Stator-Voltage Decoupling Control Strategy for DFIG-based Wind Power Turbine Supplying Local Isolated Load  

Science Journals Connector (OSTI)

The performance of doubly fed induction generator (DFIG) based wind turbines supplying local isolated load is manly up to the stator-voltage control strategy. Compared with conventional steady mathematic model based one, a dynamic mathematic model based ... Keywords: dynamic model, supplying local isolated load, decoupling stator-voltage control, DFIG-based wind turbine

Long Zhan; Shuying Yang; Hui Gao

2012-10-01T23:59:59.000Z

464

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

Wind-Powered Generation Examples are: The rough running bands of hydro turbines Loadings of coal burning steam plants at which coal mills

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

465

E-Print Network 3.0 - avispa-iie wind generator Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

doctor award (PO.139) Track: Technical Summary: on doubly-fed induction generator wind turbines with partial scale converter and on multipole permanent... magnet synchronous...

466

October 11, 2011 Wind Generation  

E-Print Network [OSTI]

years. #12;Reading on ESRP 285 Website #12;The Competition: Gas-Fired Generation from a Combined CycleESRP 285 October 11, 2011 Wind Generation · Videos · Power Point Lecture #12;Wind Videos Wind (CC) Power Plant #12;Wind Investors Face These Costs #12;Fixed Costs #12;Variable Costs #12;Bottom

Ford, Andrew

467

Wind Turbines and Ghost Stories: The Effects of Infrasound on the Human Auditory System  

Science Journals Connector (OSTI)

Climate change and fossil fuel depletion have pushed many countries to seek and invest in alternative clean energy sources such as wind energy. By converting kinetic energy from the wind into mechanical or electrical energy wind farms in California for example power nearly 850 000 households each year while producing negligible green house gases and contributing little to water pollution. Nevertheless several ecological and environmental concerns remain. High levels of infrasound and low frequency sounds generated by wind turbines pose a potentially serious threat to communities near wind farms. Wind energy companies remain largely dismissive claiming that wind turbine noise is subaudible undetectable by humans and therefore presents minimal risk to human health. However various cochlear microphonic distortion product otoacoustic emission and functional magnetic resonance imaging (fMRI) studies have demonstrated the detection of infrasound by the human inner ear and auditory cortex. Additional psychosomatic stress and disorders including the “wind turbine syndrome” and paranormal experiences are also linked to infrasound exposures. With wind turbines generating substantial levels of infrasound and low frequency sound modifications and regulations to wind farm engineering plans and geographical placements are necessary to minimize community exposure and potential human health risks.

Hsuan?hsiu Annie Chen; Peter Narins

2012-01-01T23:59:59.000Z

468

High-Order Sliding Mode Control for DFIG-Based Wind Turbine Fault Ride-Through  

E-Print Network [OSTI]

-scale power converter WT concept, the DFIG offers some advantages, such as reduced inverter and output filterHigh-Order Sliding Mode Control for DFIG-Based Wind Turbine Fault Ride-Through Mohamed Benbouzid with the Fault Ride-Through (FRT) capability assessment of a Doubly-Fed Induction Generator (DFIG)-based Wind

Paris-Sud XI, Université de

469

City of Medford Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Medford Wind Turbine Medford Wind Turbine Jump to: navigation, search Name City of Medford Wind Turbine Facility City of Medford Wind Turbine Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner City of Medford Developer Sustainable Energy Developments Energy Purchaser City of Medford Location Medford MA Coordinates 42.415768°, -71.107337° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.415768,"lon":-71.107337,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

470

Three D Metals Wind Turbine | Open Energy Information  

Open Energy Info (EERE)

Three D Metals Wind Turbine Three D Metals Wind Turbine Jump to: navigation, search Name Three D Metals Wind Turbine Facility Three D Metals Wind Turbine Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Three D Metals Energy Purchaser Three D Metals Location Valley City OH Coordinates 41.248155°, -81.883079° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.248155,"lon":-81.883079,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

471

NREL: News Feature - New Test Facility to Improve Wind Turbines  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Test Facility to Improve Wind Turbines Test Facility to Improve Wind Turbines December 26, 2013 Two men stand in front of the test equipment in the dynamometer facility discussing work being done. Behind them are two large blue machines that make up the dynamometer test apparatus. A white wind turbine nacelle system is attached to these devices to their left. Enlarge image NREL engineer Scott Lambert (left) and Project Manager Mark McDade discuss calibrations being done on the new dynamometer at the 5-MW Dynamometer Test Facility at NREL's National Wind Technology Center (NWTC). Credit: Dennis Schroeder Premature failures of mechanical systems have a significant impact on the cost of wind turbine operations and thus the total cost of wind energy. Recently, the Energy Department's National Renewable Energy Laboratory

472

Will 10 MW Wind Turbines Bring Down the Operation and Maintenance Cost of Offshore Wind Farms?  

Science Journals Connector (OSTI)

Abstract Larger wind turbines are believed to be advantageous from an investment and installation perspective, since costs for installation and inner cabling are dependent mainly on the number of wind turbines and not their size. Analogously, scaling up the turbines may also be argued to be advantageous from an operation and maintenance (O&M) perspective. For a given total power production of the wind farm, larger wind turbines give a smaller number of individual machines that needs to be maintained and could therefore give smaller O&M costs. However, the O&M costs are directly dependent on how failure rates, spare part costs, and time needed by technicians to perform each maintenance task and will develop for larger wind turbines. A simulation study is carried out with a discrete-event simulation model for the operational phase of an offshore wind farm, comparing the O&M costs of a wind farm consisting of 5 MW turbines with a wind farm consisting of 10 MW turbines. Simulation results confirm that O&M costs decrease when replacing two 5 MW turbines by one 10 MW turbine, if the total production capacity and all other parameters are kept equal. However, whether larger wind turbines can contribute to a reduction of cost of energy from an O&M perspective is first and foremost dependent on how the failure rates and maintenance durations for such wind turbines will develop compared to 5 MW wind turbines. Based on the results of this analysis, it is concluded that higher failure rates and maintenance durations rapidly are counterbalancing the benefits of larger wind turbines.

Matthias Hofmann; Iver Bakken Sperstad

2014-01-01T23:59:59.000Z

473

Turbine Inflow Characterization at the National Wind Technology Center  

SciTech Connect (OSTI)

Utility-scale wind turbines operate in dynamic flows that can vary significantly over timescales from less than a second to several years. To better understand the inflow to utility-scale turbines, two inflow towers were installed and commissioned at the National Renewable Energy Laboratory's (NREL) National Wind Technology Center near Boulder, Colorado, in 2011. These towers are 135 m tall and instrumented with a combination of sonic anemometers, cup anemometers, wind vanes, and temperature measurements to characterize the inflow wind speed and direction, turbulence, stability and thermal stratification to two utility-scale turbines. Herein, we present variations in mean and turbulent wind parameters with height, atmospheric stability, and as a function of wind direction that could be important for turbine operation as well as persistence of turbine wakes. Wind speed, turbulence intensity, and dissipation are all factors that affect turbine performance. Our results show that these all vary with height across the rotor disk, demonstrating the importance of measuring atmospheric conditions that influence wind turbine performance at multiple heights in the rotor disk, rather than relying on extrapolation from lower levels.

Clifton, A.; Schreck, S.; Scott, G.; Kelley, N.; Lundquist, J. K.

2012-01-01T23:59:59.000Z

474

The EPRI/DOE Utility Wind Turbine Performance Verification Program  

SciTech Connect (OSTI)

In 1992, the Electric Power Research Institute (EPRI) and the US Department of Energy (DOE) initiated the Utility Wind Turbine Performance Verification Program (TVP). This paper provides an overview of the TVP, its purpose and goals, and the participating utility projects. Improved technology has significantly reduced the cost of energy from wind turbines since the early 1980s. In 1992, turbines were producing electricity for about $0.07--$0.09/kilowatt-hour (kWh) (at 7 m/s [16 mph sites]), compared with more than $0.30/kWh in 1980. Further technology improvements were expected to lower the cost of energy from wind turbines to $0.05/kWh. More than 17,000 wind turbines, totaling more than 1,500 MW capacity, were installed in the US, primarily in California and Hawaii. The better wind plants had availabilities above 95%, capacity factors exceeding 30%, and operation and maintenance costs of $0.01/kWh. However, despite improving technology, EPRI and DOE recognized that utility use of wind turbines was still largely limited to turbines installed in California and Hawaii during the 1980s. Wind resource assessments showed that other regions of the US, particularly the Midwest, had abundant wind resources. EPRI and DOE sought to provide a bridge from utility-grade turbine development programs under way to commercial purchases of the wind turbines. The TVP was developed to allow utilities to build and operate enough candidate turbines to gain statistically significant operating and maintenance data.

Calvert, S.; Goldman, P. [Department of Energy, Washington, DC (United States); DeMeo, E.; McGowin, C. [Electric Power Research Inst., Palo Alto, CA (United States); Smith, B.; Tromly, K. [National Renewable Energy Lab., Golden, CO (United States)

1997-01-01T23:59:59.000Z

475

Xi an Nordex Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment Co  

Open Energy Info (EERE)

Xi an Nordex Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment Co Xi an Nordex Wind Turbine Co Ltd aka Xi an Weide Wind Power Equipment Co Ltd Jump to: navigation, search Name Xi'an Nordex Wind Turbine Co Ltd (aka Xi'an Weide Wind Power Equipment Co Ltd) Place Xi An, Shaanxi Province, China Zip 710021 Sector Wind energy Product Subsidiary of Xiâ€(tm)an Aero-Engine that manufactures its 600kW wind turbines in Xi An, China. References Xi'an Nordex Wind Turbine Co Ltd (aka Xi'an Weide Wind Power Equipment Co Ltd)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Xi'an Nordex Wind Turbine Co Ltd (aka Xi'an Weide Wind Power Equipment Co Ltd) is a company located in Xi An, Shaanxi Province, China . References ↑ "[ Xi'an Nordex Wind Turbine Co Ltd (aka Xi'an Weide Wind

476

Operating wind turbines in strong wind conditions by using feedforward-feedback control  

Science Journals Connector (OSTI)

Due to the increasing penetration of wind energy into power systems, it becomes critical to reduce the impact of wind energy on the stability and reliability of the overall power system. In precedent works, Shen and his co-workers developed a re-designed operation schema to run wind turbines in strong wind conditions based on optimization method and standard PI feedback control, which can prevent the typical shutdowns of wind turbines when reaching the cut-out wind speed. In this paper, a new control strategy combing the standard PI feedback control with feedforward controls using the optimization results is investigated for the operation of variable-speed pitch-regulated wind turbines in strong wind conditions. It is shown that the developed control strategy is capable of smoothening the power output of wind turbine and avoiding its sudden showdown at high wind speeds without worsening the loads on rotor and blades.

Ju Feng; Wen Zhong Sheng

2014-01-01T23:59:59.000Z

477

Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loading: Preprint  

SciTech Connect (OSTI)

Large-eddy simulations of atmospheric boundary layers under various stability and surface roughness conditions are performed to investigate the turbulence impact on wind turbines. In particular, the aeroelastic responses of the turbines are studied to characterize the fatigue loading of the turbulence present in the boundary layer and in the wake of the turbines. Two utility-scale 5 MW turbines that are separated by seven rotor diameters are placed in a 3 km by 3 km by 1 km domain. They are subjected to atmospheric turbulent boundary layer flow and data is collected on the structural response of the turbine components. The surface roughness was found to increase the fatigue loads while the atmospheric instability had a small influence. Furthermore, the downstream turbines yielded higher fatigue loads indicating that the turbulent wakes generated from the upstream turbines have significant impact.

Lee, S.; Churchfield, M.; Moriarty, P.; Jonkman, J.; Michalakes, J.

2011-12-01T23:59:59.000Z

478

Understanding Trends in Wind Turbine Prices Over the Past Decade  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Understanding Trends in Wind Turbine Prices Over the Past Decade Understanding Trends in Wind Turbine Prices Over the Past Decade Title Understanding Trends in Wind Turbine Prices Over the Past Decade Publication Type Report Refereed Designation Unknown Year of Publication 2011 Authors Bolinger, Mark, and Ryan H. Wiser Pagination 46 Date Published 10/2011 Publisher LBNL City Berkeley Keywords electricity markets and policy group, energy analysis and environmental impacts department Abstract Berkeley Lab has gathered price data on 81 U.S. wind turbine transactions totaling 23,850 MW announced from 1997 through early 2011. Figure ES-1 depicts these reported wind turbine transaction prices (along with the associated trend line), broken out by the size of the transaction (in MW). Figure ES-1 also presents average (global) turbine prices reported by Vestas for the years 2005 through 2010, as well as a range of reported pricing (among various turbine manufacturers) for transactions signed in 2010 and so far in 2011 (with 2011 prices generally lower than 2010 prices). After hitting a low of roughly $750/kW from 2000 to 2002, average wind turbine prices doubled through 2008, rising to an average of roughly $1,500/kW. Wind turbine prices have since declined substantially, with price quotes for transactions executed in 2010 and to date in 2011 ranging from $900-$1,400/kW depending on the manufacturer and turbine model. For example, turbines designed for lower wind speed sites - deploying higher hub heights and larger rotor diameters for a given nameplate capacity - are priced at the higher end of this range. These quotes suggest price declines of as much as 33% or more since late 2008, with an average decline closer to perhaps 20% for orders announced in 2010 (as opposed to in 2011, which has seen further price declines). These two substantial and opposing wind turbine price trends over the past decade - and particularly the doubling in prices in the 2002-2008 period - run counter to the smooth, gradually declining technology cost trajectories that are often assumed by energy analysts modeling the diffusion of new technologies, including wind power. Understanding and explaining this notable discrepancy between theory and historical reality is the primary motivation for this work. Taking a bottom-up approach, this report examines seven primary drivers of wind turbine prices in the United States, with the goal of estimating the degree to which each contributed to the doubling in turbine prices from 2002 through 2008, as well as the subsequent decline in prices through 2010 (our analysis does not extend into 2011 because several of these drivers are best gauged on a full-year basis due to seasonality issues).

479

Wind turbine aeroacoustic noise and noise mitigation strategies.  

Science Journals Connector (OSTI)

Wind turbines are becoming an important piece of the solution to low?carbon power production. However as more turbines are installed near population centers the environmental impacts associated with these machines such as noise are also becoming more obvious. Aeroacousticnoise is generally thought to be the greatest source of acoustical noise in wind turbine systems. This study will present measurement results collected at the National Wind Technology Center on an operating wind turbine that characterize the total received acoustic field surrounding the turbine. Designs and preliminary measurements of trailing edge modifications to the outboard airfoil sections will be discussed as a means of partial noise mitigation. In addition future aeroacousticnoise treatments and measurement plans will be mentioned.

Michael Asheim; Paul Papas; Patrick Moriarty; Jon Collis

2010-01-01T23:59:59.000Z

480

Safety and Function Test Report for the SWIFT Wind Turbine  

SciTech Connect (OSTI)

This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. Three turbines where selected for testing at the National Wind Technology Center (NWTC) as a part of round two of the Small Wind Turbine Independent Testing project. Safety and Function testing is one of up to 5 tests that may be performed on the turbines. Other tests include power performance, duration, noise, and power quality. The results of the testing will provide the manufacturers with reports that may be used for small wind turbine certification.

Mendoza, I.; Hur, J.

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "wind turbines generate" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


481

PHYSICAL REVIEW E 88, 042146 (2013) Uncovering wind turbine properties through two-dimensional stochastic modeling of wind dynamics  

E-Print Network [OSTI]

PHYSICAL REVIEW E 88, 042146 (2013) Uncovering wind turbine properties through two, such as the rated speed of the wind turbine or the descriptive wind speed statistics, can be related to the equations describing the evolution of power production and wind speed at single wind turbines. DOI: 10

Peinke, Joachim

482

A simple method of estimating wind turbine blade fatigue at potential wind turbine sites  

SciTech Connect (OSTI)

This paper presents a technique of estimating blade fatigue damage at potential wind turbine sites. The cornerstone of this technique is a simple model for the blade`s root flap bending moment. The model requires as input a simple set of wind measurements which may be obtained as part of a routine site characterization study. By using the model to simulate a time series of the root flap bending moment, fatigue damage rates may be estimated. The technique is evaluated by comparing these estimates with damage estimates derived from actual bending moment data; the agreement between the two is quite good. The simple connection between wind measurements and fatigue provided by the model now allows one to readily discriminate between damaging and more benign wind environments.

Barnard, J.C.; Wendell, L.L.

1995-06-01T23:59:59.000Z

483

Line-Fault Ride-Through (LFRT) Capabilities of DFIG Wind Turbine Connected to the Power System  

Science Journals Connector (OSTI)

Abstract With increased penetration of wind power into electrical grids, DFIG wind turbines are largely deployed due to their variable speed feature and hence influencing system dynamics. According to grid codes issued by utilities, tripping of wind turbines following power system faults is not allowed. Besides, to provide voltage support to the grid, reactive current supply is necessary. This paper studies the power flow (PF) of two different networks, the first is a transmission network and the second is a distribution one, A wind Doubly-Fed Induction Generator (DFIG) turbine is injected to these different networks. A line fault right through (LFRT) is applied on each network and the power flow results are given and compared, then a new solution is proposed to connect the wind turbine to the distribution network with a down transformer to not disconnect the wind turbine during the LFRT, the power system analysis toolbox (PSAT) is used in this work.

A. Khattara; M. Bahri; A. Aboubou; M. Becherif; M.Y. Ayad

2013-01-01T23:59:59.000Z

484

EA-1792: University of Maine's Deepwater Offshore Floating Wind Turbine  

Broader source: Energy.gov (indexed) [DOE]

EA-1792: University of Maine's Deepwater Offshore Floating Wind EA-1792: University of Maine's Deepwater Offshore Floating Wind Turbine Testing and Demonstration Project, Gulf of Maine EA-1792: University of Maine's Deepwater Offshore Floating Wind Turbine Testing and Demonstration Project, Gulf of Maine Summary This EA evaluates the environmental impacts of a proposal to support research on floating offshore wind turbine platforms. This project would support the mission, vision, and goals of DOE's Office of Energy Efficiency and Renewable Energy Wind and Water Power Program to improve performance, lower costs, and accelerate deployment of innovative wind power technologies. Development of offshore wind energy technologies would help the nation reduce its greenhouse gas emissions, diversify its energy supply, provide cost-competitive electricity to key coastal regions, and

485

Liberty Turbine Test Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Turbine Test Wind Farm Turbine Test Wind Farm Jump to: navigation, search Name Liberty Turbine Test Wind Farm Facility Liberty Turbine Test Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Developer Clipper Windpower Energy Purchaser Platte River Power Authority Location Near Medicine Bow WY Coordinates 41.96251°, -106.415918° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.96251,"lon":-106.415918,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

486

Beijing Goldwind Kechuang Wind Turbine Manufacturer | Open Energy  

Open Energy Info (EERE)

Goldwind Kechuang Wind Turbine Manufacturer Goldwind Kechuang Wind Turbine Manufacturer Jump to: navigation, search Name Beijing Goldwind Kechuang Wind Turbine Manufacturer Place Beijing, Beijing Municipality, China Zip 100000 Sector Wind energy Product A manufacturer set up by Goldwind in Beijing for producing wind turbines. Coordinates 39.90601°, 116.387909° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.90601,"lon":116.387909,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

487

St h ti d i l i fStochastic dynamic analysis of offshore wind turbines  

E-Print Network [OSTI]

1 St h ti d i l i fStochastic dynamic analysis of offshore wind turbines ­ with emphasis on fatigue analysis of offshore bottom-fixed wind turbines · Modelling and dynamic analysis of floating wind turbines ­ Stochastic dynamic analysis of offshore wind turbines; mooring system for wave energy converters · 2010 8

Nørvåg, Kjetil

488

MODAL PARAMETER ESTIMATION FOR OPERATIONAL WIND TURBINES Emilio Di Lorenzo1, 2  

E-Print Network [OSTI]

MODAL PARAMETER ESTIMATION FOR OPERATIONAL WIND TURBINES Emilio Di Lorenzo1, 2 , Simone Manzato1 Claudio 21, 80125 Naples, Italy emilio.dilorenzo@lmsintl.com ABSTRACT Wind turbines are time. This assumption holds in the case of parked wind turbines, but not in the case of operating wind turbines

Boyer, Edmond

489

58:164 Fundamentals of Wind Turbines (ME:4164:0001)  

E-Print Network [OSTI]

58:164 ­ Fundamentals of Wind Turbines (ME:4164:0001) Syllabus P. Barry Butler 111 Jessup Hall The University of Iowa Iowa City, IA January, 2012 #12;2 Spring 2012 58:164 ­ Fundamentals of Wind Turbines mechanics and mechanical systems to wind turbine engineering. Fundamentals of horizontal-axis wind turbines

Kusiak, Andrew

490

The Potential Health Impact of Wind Turbines Chief Medical Officer of Health (CMOH) Report  

E-Print Network [OSTI]

The Potential Health Impact of Wind Turbines Chief Medical Officer of Health (CMOH) Report May 2010) of Ontario in response to public health concerns about wind turbines, particularly related to noise. Assisted by wind turbines. The review concludes that while some people living near wind turbines report symptoms

Firestone, Jeremy

491

Analysis and Flight Test Validation of High Performance AirborneWind Turbines  

Science Journals Connector (OSTI)

Makani Power has developed an autonomous airborne wind turbine prototype incorporating a rigid wing with onboard...

Damon Vander Lind

2013-01-01T23:59:59.000Z

492

www.cesos.ntnu.no Author Centre for Ships and Ocean Structures Offshore Wind Turbine Operation  

E-Print Network [OSTI]

1 www.cesos.ntnu.no Author ­ Centre for Ships and Ocean Structures Offshore Wind Turbine Operation icing for offshore Wind Turbines ? · Wherever there is sea icing ! · Temperature bellow zero degree Structures Outline · Introduction · Wind Turbine Operational Conditions · Wind Turbine Operation under

Nørvåg, Kjetil

493

A Gravitational Search Algorithm (GSA) based Photo-Voltaic (PV) excitation control strategy for single phase operation of three phase wind-turbine coupled induction generator  

Science Journals Connector (OSTI)

Abstract Three phase induction generators are widely used for single phase operation in wind based micro-generation schemes to cater single phase loads due to various advantages. This paper presents an improved control methodology for self excited three phase induction generator operating in single phase mode. The excitation is controlled through an inverter with Photo-Voltaic (PV) panels providing power to the dc bus. The proposed technique enables the generator for building up voltage from low wind speeds compared to conventional three phase machines. A capacitor connected across load terminals reduces the reactive power supplied by the inverter connected across the other two phases. Gravitational search algorithm (GSA) is used to calculate the switching angles of the inverter under various load and wind speeds for minimum Total Harmonic Distortion (THD) of the generated voltage. The proposed induction generator is aimed to be conveniently used in remote and grid isolated areas as a portable source of electrical power driving single phase loads. Simulations and experiments performed on a 3-phase 1 kW, 415 V, 50 Hz, 1440 r/min induction machine validates the proposed concept.

Arunava Chatterjee; Krishna Roy; Debashis Chatterjee

2014-01-01T23:59:59.000Z

494

Wind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation  

E-Print Network [OSTI]

Laboratory Wind Energy Department P.O. Box 49 DK-4000 Roskilde, Denmark clemens.jauch@risoe.dk Abstract in Norway [4]. For the purpose of this research work the power system model has been extended with a windWind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation Clemens Jauch Risø National

495

Feasibility of the Application of a Spar-type Wind Turbine at a Moderate Water Depth  

Science Journals Connector (OSTI)

The feasibility of the application of a spar-type wind turbine at a moderate water depth is studied in this paper. In the oil and gas industries, spar-type offshore platforms are widely applied in deep water. The same idea is used in offshore wind technology to present the Hywind concept based on a catenary moored spar in deep water. The draft of the spar limits the application of spar-type wind turbines in shallow water. However, it is possible to design spar-type wind turbines for moderate water depths. The present article studies the feasibility and performance of such a design. A spar-type wind turbine at a moderate water depth called “ShortSpar” is introduced in the present article. A catenary moored spar-type support structure is applied as a base for the 5-MW NREL land-based turbine. The power performance, structural integrity and dynamic responses of a 5-MW catenary moored spar-type wind turbine in deep water (DeepSpar) have previously been studied. In the present article, the responses of the spar-type wind turbines, ShortSpar and DeepSpar, are compared. The HAWC2 code is used to carry out the coupled aero-hydro-servo-elastic analyses. Different environmental conditions are used to compare the responses. A dynamic link library (DLL) is used to feed the mooring forces at each time step into the HAWC2 code. The force-displacement relationships are obtained from the Simo-Riflex code. The comparison of the responses of ShortSpar and DeepSpar in different load cases indicates the feasibility of implementation of spar-type wind turbine in moderate water depths. The results show that the spar-type wind turbine at a moderate water depth exhibits good performance, and its responses are reasonable compared with those associated with a spar-type wind turbine in deep water. The total mass (the structural mass plus the ballast) of ShortSpar is 35% less than the mass of DeepSpar, while the statistical characteristics of the generated power are almost the same for both spars. This mass reduction for ShortSpar helps to achieve a more cost-effective solution for floating wind turbines at a moderate water depth.

Madjid Karimirad; Torgeir Moan

2012-01-01T23:59:59.000Z

496

Cost Study for Large Wind Turbine Blades  

SciTech Connect (OSTI)

The cost study for large wind turbine blades reviewed three blades of 30 meters, 50 meters, and 70 meters in length. Blade extreme wind design loads were estimated in accordance with IEC Class I recommendations. Structural analyses of three blade sizes were performed at representative spanwise stations assuming a stressed shell design approach and E-glass/vinylester laminate. A bill of materials was prepared for each of the three blade sizes using the laminate requirements prepared during the structural analysis effort. The labor requirements were prepared for twelve major manufacturing tasks. TPI Composites developed a conceptual design of the manufacturing facility for each of the three blade sizes, which was used for determining the cost of labor and overhead (capital equipment and facilities). Each of the three potential manufacturing facilities was sized to provide a constant annual rated power production (MW per year) of the blades it produced. The cost of the production tooling and overland transportation was also estimated. The results indicate that as blades get larger, materials become a greater proportion of total cost, while the percentage of labor cost is decreased. Transportation costs decreased as a percentage of total cost. The study also suggests that blade cost reduction efforts should focus on reducing material cost and lowering manufacturing labor, because cost reductions in those areas will have the strongest impact on overall blade cost.

ASHWILL, THOMAS D.

2003-05-01T23:59:59.000Z

497

10MW Class Direct Drive HTS Wind Turbine: Cooperative Research and Development Final Report, CRADA Number CRD-08-00312  

SciTech Connect (OSTI)

This paper summarizes the work completed under the CRADA between NREL and American Superconductor (AMSC). The CRADA combined NREL and AMSC resources to benchmark high temperature superconducting direct drive (HTSDD) generator technology by integrating the technologies into a conceptual wind turbine design, and comparing the design to geared drive and permanent magnet direct drive (PMDD) wind turbine configurations. Analysis was accomplished by upgrading the NREL Wind Turbine Design Cost and Scaling Model to represent geared and PMDD turbines at machine ratings up to 10 MW and then comparing cost and mass figures of AMSC's HTSDD wind turbine designs to theoretical geared and PMDD turbine designs at 3.1, 6, and 10 MW sizes.

Musial, W.

2011-05-01T23:59:59.000Z

498

Student Competition Prepares the Next Generation of Wind Energy  

Broader source: Energy.gov (indexed) [DOE]

Competition Prepares the Next Generation of Wind Energy Competition Prepares the Next Generation of Wind Energy Entrepreneurs Student Competition Prepares the Next Generation of Wind Energy Entrepreneurs April 11, 2013 - 11:32am Addthis The Collegiate Wind Competition is one of several Energy Department-supported programs aiming to inspire the next generation of clean energy leaders. Here, JMU student Greg Miller demonstrates how the blades of a wind turbine work as part the Wind for Schools project. | Photo courtesy of the Virginia Center for Wind Energy. The Collegiate Wind Competition is one of several Energy Department-supported programs aiming to inspire the next generation of clean energy leaders. Here, JMU student Greg Miller demonstrates how the

499

Student Competition Prepares the Next Generation of Wind Energy  

Broader source: Energy.gov (indexed) [DOE]

Student Competition Prepares the Next Generation of Wind Energy Student Competition Prepares the Next Generation of Wind Energy Entrepreneurs Student Competition Prepares the Next Generation of Wind Energy Entrepreneurs April 11, 2013 - 11:32am Addthis The Collegiate Wind Competition is one of several Energy Department-supported programs aiming to inspire the next generation of clean energy leaders. Here, JMU student Greg Miller demonstrates how the blades of a wind turbine work as part the Wind for Schools project. | Photo courtesy of the Virginia Center for Wind Energy. The Collegiate Wind Competition is one of several Energy Department-supported programs aiming to inspire the next generation of clean energy leaders. Here, JMU student Greg Miller demonstrates how the

500

Potential wind power generation in South Egypt  

Science Journals Connector (OSTI)

Egypt is one of the developing countries. The production of electricity in Egypt is basically on petroleum, natural gas, hydro-power and wind energy. The objective of this work to prove the availability of sufficient wind potential in the wide area of deep south Egypt for the operation of wind turbines there. Nevertheless, it gives in general an approximate profile which is useful to the wind parks design for this area. The data used in the calculation are published and analyzed for the first time. The diagrams of the measured wind data for three meteorological stations over a period of two years (wind speed, frequency, direction), wind shear coefficient, the mean monthly and annual wind speed profile for every location are presented. Monthly Weibull parameters, standard deviation and coefficient of variation have been statistically discussed. A comparison of the rose diagrams shows that the wind speed is more persistent and blow over this region of Egypt in two main sectors N and NNW with long duration of frequencies from 67% to 87% over the year with an average wind speed in the range 6.8–7.9 m/s at the three stations. Evaluation of monthly wind energy density at 10 m height by two different methods was carried out. And the final diagram for every site shows no significant difference between them. The annual natural wind energies at 70 m A.G.L. lie between 333 and 377 W/m2 for Dakhla South and Kharga stations, respectively, which is similar to the inland wind potential of Vindeby (Denmark) and some European countries. These results indicate that Kharga and Dakhla South locations are new explored sites for future wind power generation projects.

Ahmed Shata Ahmed

2012-01-01T23:59:59.000Z