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Note: This page contains sample records for the topic "optimal power flow" 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

Optimal Power Flow Incorporating Voltage Collapse Constraints  

E-Print Network [OSTI]

Optimal Power Flow Incorporating Voltage Collapse Constraints William Rosehart Claudio Ca on the current operating con- ditions is presented. Second, an Optimal Power Flow formulation that incorporates: Voltage Collapse, Optimal Power Flow, Bifur- cations. I. Introduction As open-access market principles

Cañizares, Claudio A.

2

Optimal power flow in microgrids using event-triggered optimization Pu Wan and Michael D. Lemmon  

E-Print Network [OSTI]

Optimal power flow in microgrids using event-triggered optimization Pu Wan and Michael D. Lemmon Abstract-- Microgrids are power generation and distribution systems in which users and generators-triggered distributed optimization algorithm to solve the optimal power flow (OPF) problem in microgrids. Under event

Lemmon, Michael

3

Multi-objective Optimal Power Flows to Evaluate Voltage Security Costs in Power Networks  

E-Print Network [OSTI]

1 Multi-objective Optimal Power Flows to Evaluate Voltage Security Costs in Power Networks William Abstract-- In this paper, new optimal power flow (OPF) tech- niques are proposed based on multi- dard power flow models. The results obtained using the proposed mixed OPFs are compared and analyzed

Cañizares, Claudio A.

4

DC Optimal Power Flow: Uniqueness and Chee Wei Tan  

E-Print Network [OSTI]

and are computationally fast for practical smart power grids. I. BACKGROUND The Optimal Power Flow (OPF) problem network. The DC-OPF can be practically important in a smart grid, where there are renewables, e.g., solar implications on how algorithms can be designed to solve the OPF in a smart grid. Different from prior work

Tan, Chee Wei

5

Fuzzy modelling of power system optimal load flow  

SciTech Connect (OSTI)

In this paper, a fuzzy model for power system operation is presented. Uncertainties in loads and generations are modeled as fuzzy numbers. System behavior under known (while uncertain) injections is dealt with by a DC fuzzy power flow model. System optimal (while uncertain) operation is calculated with linear programming procedures where the problem nature and structure allows some efficient techniques such as Dantzig Wolfe decomposition and dual simplex to be used. Among the results, one obtains a fuzzy cost value for system operation and possibility distributions for branch power flows and power generations. Some risk analysis is possible, as system robustness and exposure indices can be derived and hedging policies can be investigated.

Miranda, V.; Saraiva, J.T. (FEUP, DEEC, Faculdade de Engenharia da Univ. do Porto, INESC, Inst. de Engenharia de Sistemas e Computadores, Lg de Mompilher 4000 Porto (PT))

1992-05-01T23:59:59.000Z

6

Nonlinear optimal power flow 1.0 Some introductory comments  

E-Print Network [OSTI]

1 Nonlinear optimal power flow 1.0 Some introductory comments Although the LPOPF does bring computation. We will also see that the NLOPF admits additional control capabilities that can be very useful Define: ng: number of generators N: number of buses x: state vector u: control vector Ei

McCalley, James D.

7

Probabilistic Optimal Power Flow Applications to Electricity Markets  

E-Print Network [OSTI]

of electricity markets, special attention is paid to the uncertainty in Locational Marginal Prices (LMPs], [2]. In markets based on optimal power flows (OPF) to calculate electricity prices, one may use prices. Since OPF is a deterministic tool, it is necessary to complete many simulations to en- compass

Cañizares, Claudio A.

8

Security Constrained Optimal Power Flow 1.0 Introduction and notation  

E-Print Network [OSTI]

1 Security Constrained Optimal Power Flow 1.0 Introduction and notation Figure 1 below compares the optimal power flow (OPF) with the security-constrained optimal power flow (SCOPF). Fig. 1 Some comments normal flow moves from just 100% of continuous rating. SCOPF differs from an OPF solution

McCalley, James D.

9

Optimal mixing and optimal stirring for fixed energy, fixed power or fixed palenstrophy flows  

E-Print Network [OSTI]

Optimal mixing and optimal stirring for fixed energy, fixed power or fixed palenstrophy flows-time perfect mixing with a finite energy constraint on the stirring flow. On the other hand, using techniques, University of Michigan, Ann Arbor, MI 48109 (Dated: 31 March 2012) We consider passive scalar mixing

Novikov, Alexei

10

Zero Duality Gap in Optimal Power Flow Problem Javad Lavaei and Steven H. Low  

E-Print Network [OSTI]

power flow (OPF) problem deals with finding an optimal operating point of a power system that mini1 Zero Duality Gap in Optimal Power Flow Problem Javad Lavaei and Steven H. Low Abstract--The optimal power flow (OPF) problem is nonconvex and generally hard to solve. In this paper, we propose

Low, Steven H.

11

Stability-Constrained Optimal Power Flow and Its Application to Pricing Power System Stabilizers  

E-Print Network [OSTI]

locational marginal prices. A power system stabilizer (PSS) is then introduced in the test system, locational marginal prices, power system stabilizer, voltage stability. I. INTRODUCTION THE deregulation1 Stability-Constrained Optimal Power Flow and Its Application to Pricing Power System Stabilizers

Cañizares, Claudio A.

12

Islanding model for preventing wide-area blackouts and the issue of local solutions of the optimal power flow problem.  

E-Print Network [OSTI]

Optimization plays a central role in the control and operation of electricity power networks. In this thesis we focus on two very important optimization problems in power systems. The first is the optimal power flow ...

Bukhsh, Waqquas Ahmed

2014-07-01T23:59:59.000Z

13

Biogeography-Based Optimization and the Solution of the Power Flow Problem  

E-Print Network [OSTI]

for power utilities is the optimal power flow (OPF) problem which was introduced in 1962 by the French engineer Jules Carpentier [7]. A power utility may own power generating plants fueled by coal, natural gas absorbed by the loads plus the power losses that occur in the transmission system. Second, both the active

Simon, Dan

14

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 15, NO. 2, MAY 2000 535 Stability-Constrained Optimal Power Flow  

E-Print Network [OSTI]

Power Flow Deqiang Gan, Member, IEEE, Robert J. Thomas, Fellow, IEEE, and Ray D. Zimmerman, Member, IEEE in the context of a 162-bus system. Index Terms--Power System, Transient Stability, Optimal Power Flow, Numerical, they do provide for a simple mapping between controllable generation dispatch and indices

15

Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson...  

Open Energy Info (EERE)

do not have control signal or no loop in the system It only used deterministic optimization The power flow was static state. Question: Did they simulate the case or they have...

16

Jacobian Singularities in Optimal Power Flow Problems Caused by Intertemporal Constraints  

E-Print Network [OSTI]

that are time-dependent such as generator ramp limits and specifically energy storage constraints may cause on the Newton-Raphson al- gorithm are widely used to solve Optimal Power Flow (OPF) and Economic Dispatch a storage device is integrated into a multi-timestep OPF problem and the optimal solution

Li, Xin

17

IEEE TRANS. ON CONTROL OF NETWORK SYSTEMS, JUNE 2014 (WITH PROOFS) 1 Convex Relaxation of Optimal Power Flow  

E-Print Network [OSTI]

to optimize a certain objective function, such as power loss, generation cost and/or user utilities, subject Power Flow Part II: Exactness Steven H. Low Electrical Engineering, Computing+Mathematical Sciences recent advances in the convex relaxation of the optimal power flow (OPF) problem, focusing on structural

Low, Steven H.

18

A TWO-STAGE APPROACH TO SOLVING LARGE-SCALE OPTIMAL POWER FLOWS  

E-Print Network [OSTI]

A TWO-STAGE APPROACH TO SOLVING LARGE-SCALE OPTIMAL POWER FLOWS *F e l i x F. Wu George Gross James problem is formulated as an unconstrained minimization problem using penalty functions and i s solved ] and Sasson and Merrill [ 3 ] . The s i z e and t h e extensive amount of computation involved i n solving t h

Gross, George

19

Outage Detection in Power Distribution Networks with Optimally-Deployed Power Flow Sensors  

E-Print Network [OSTI]

. When two-way communications from the operator and the smart meters are available, AMI polling has been deployed real-time power flow sensors and that of load estimates via Advanced Metering Infrastructure (AMI

Zhao, Yue

20

A Transient Stability Constrained Optimal Power Flow Deqiang Gan (M) Robert J. Thomas (F) Ray D. Zimmerman (M)  

E-Print Network [OSTI]

1 A Transient Stability Constrained Optimal Power Flow Deqiang Gan (M) Robert J. Thomas (F) Ray D. The methodology involves a stability constrained Optimal Power Flow (OPF). The theoretical development between controllable generation dispatch and indices such as an energy margin, rotor angles, etc

Note: This page contains sample records for the topic "optimal power flow" 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

DC Optimal Power Flow Formulation in AMES Leigh Tesfatsion  

E-Print Network [OSTI]

@iastate.edu, http://www.econ.iastate.edu/tesfatsi/ Fig. 1. AMES day-ahead energy market activities during each day D wholesale power market testbed. I. AMES TESTBED The latest version of AMES (Agent-based Modeling.econ.iastate.edu/tesfatsi/AMESLMPDetermination.LT.pdf this objective, the ISO operates a day-ahead energy market settled by means of LMP. The welfare of each LSE j

Tesfatsion, Leigh

22

Optimal Power Flow Formulation in Market of Retail Wheeling Taiyou Yong, Student Member, IEEE Robert Lasseter, Fellow, IEEE  

E-Print Network [OSTI]

power plants, nuclear power plants etc and selling power to consumers. The suppliers have contractsOptimal Power Flow Formulation in Market of Retail Wheeling Taiyou Yong, Student Member, IEEE at Madison, Madison, Wisconsin, USA Abstract: Power system deregulation along with retail wheeling

23

Geometry of Power Flows and Optimization in Distribution Networks Javad Lavaei, David Tse and Baosen Zhang  

E-Print Network [OSTI]

of the solution of the power flow problem, and (ii) the non-negativity of the locational marginal prices. Partial

Lavaei, Javad

24

An Optimal Power Flow (OPF) Method with Improved Power System Stability  

E-Print Network [OSTI]

) operating values, on-load tap changer (OLTC) positions and number of reactive power compensation equipments

Chen, Zhe

25

Centralized wind power plant voltage control with optimal power flow algorithm.  

E-Print Network [OSTI]

??This thesis presents a method of controlling the reactive power injected into a medium-voltage collection system by multiple wind turbine generators such that the voltage (more)

Kline, Jared Andrew

2011-01-01T23:59:59.000Z

26

Chance Constrained Optimal Power Flow: Risk-Aware Network Control under Uncertainty  

E-Print Network [OSTI]

When uncontrollable resources fluctuate, Optimum Power Flow (OPF), routinely used by the electric power industry to re-dispatch hourly controllable generation (coal, gas and hydro plants) over control areas of transmission networks, can result in grid instability, and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation under OPF with renewable variability can lead to frequent conditions where power line flow ratings are significantly exceeded. Such a condition, which is borne by simulations of real grids, would likely resulting in automatic line tripping to protect lines from thermal stress, a risky and undesirable outcome which compromises stability. Smart grid goals include a commitment to large penetration of highly fluctuating renewables, thus calling to reconsider current practices, in particular the use of standard OPF. Our Chance Constrained (CC) OPF correct...

Bienstock, Daniel; Harnett, Sean

2012-01-01T23:59:59.000Z

27

Power network analysis and optimization  

E-Print Network [OSTI]

chip power supply network optimization using multigrid-basedchip decoupling capacitor optimization for high- performanceSapatnekar, Analysis and optimization of structured power/

Zhang, Wanping

2009-01-01T23:59:59.000Z

28

Dynamics-aware Optimal Power Flow Enrique Mallada and Ao Tang  

E-Print Network [OSTI]

oscillations and voltage stability margins. This leads to two novel optimization problems that can find operation points which minimize oscillations or maximize voltage stability margins, and make apparent and small signal oscillation studies because the voltage collapse margin and stability of the operating

Tang, A. Kevin

29

DC Optimal Power Flow Formulation and Solution Using QuadProgJ  

E-Print Network [OSTI]

, still retaining an SCQP form, so that solution values for voltage angles and locational marginal prices power injections. However, solution values for locational marginal prices (LMPs), voltage angles, Chen-Ching Liu, Jim McCalley, Michael J. D. Powell, Jim Price, Harold Salazar, Johnny Wong, and Tong Wu

Tesfatsion, Leigh

30

Probabilistic Optimal Power Flow in Electricity Markets Based on a Two-Point Estimate Method  

E-Print Network [OSTI]

in an "unpredictable" manner; hence, probability distributions of locational marginal prices are calculated as a result unpredictable, which can be considered as one of the main factors for electricity price volatility in some markets. Another "by- product" of deregulation is the reduction in power system stability margins

Cañizares, Claudio A.

31

Risk-Mitigated Optimal Power Flow for Wind Powered Grids Emma Sjodin, Dennice F. Gayme and Ufuk Topcu  

E-Print Network [OSTI]

." High grid penetrations of solar or wind power pose a number of operational challenges and it is widely transmission capacity [10]. Until now, the power industry has dealt with potential failures using deterministic, Baltimore, MD, USA, 21218. dennice@jhu.edu U. Topcu is with Control and Dynamical Systems at the California

Low, Steven H.

32

Particle Swarm Optimization Based Reactive Power Optimization  

E-Print Network [OSTI]

Reactive power plays an important role in supporting the real power transfer by maintaining voltage stability and system reliability. It is a critical element for a transmission operator to ensure the reliability of an electric system while minimizing the cost associated with it. The traditional objectives of reactive power dispatch are focused on the technical side of reactive support such as minimization of transmission losses. Reactive power cost compensation to a generator is based on the incurred cost of its reactive power contribution less the cost of its obligation to support the active power delivery. In this paper an efficient Particle Swarm Optimization (PSO) based reactive power optimization approach is presented. The optimal reactive power dispatch problem is a nonlinear optimization problem with several constraints. The objective of the proposed PSO is to minimize the total support cost from generators and reactive compensators. It is achieved by maintaining the whole system power loss as minimum...

Sujin, P R; Linda, M Mary

2010-01-01T23:59:59.000Z

33

Optimization Online - Stochastic Optimization for Power System ...  

E-Print Network [OSTI]

Feb 17, 2011 ... Stochastic Optimization for Power System Configuration with Renewable Energy in Remote Areas. Ludwig Kuznia(lkuznia ***at*** mail.usf.edu)

Ludwig Kuznia

2011-02-17T23:59:59.000Z

34

Structural power flow measurement  

SciTech Connect (OSTI)

Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.

Falter, K.J.; Keltie, R.F.

1988-12-01T23:59:59.000Z

35

Network Flow Optimization under Uncertainty  

E-Print Network [OSTI]

Network model in words Minimize the cost of satisfying demands for electric energy By: imports, exports and electricity Subject to: conservation of energy flows (net after losses), lower and upper bounds on flows is a reactive approach: how would the optimal solution have changed if I'd only known? · Proactive approaches

Tesfatsion, Leigh

36

228 POWER FLOW ANALYSIS parties, it is crucial to recognize the inherently subjective nature of OPF. Power flow  

E-Print Network [OSTI]

228 POWER FLOW ANALYSIS parties, it is crucial to recognize the inherently subjective nature of OPF. Power flow analysis by itself basically answers a question of physics. By contrast, OPF answers criteria. In short, "optim- ality" does not arise from a power system's intrinsic technical properties

Kammen, Daniel M.

37

A Simple Optimal Power Flow Model with Energy Storage K. Mani Chandy, Steven H. Low, Ufuk Topcu and Huan Xu  

E-Print Network [OSTI]

or solar power. In the state of California, peak demand for power in 2003 reached 52 GW, with projections decades, and a required 15% reserve margin, an additional 60 GW of new generation capacity will be needed by 2030 [8]. In 2006, Southern California Edison, the primary electricity utility company for the southern

Heaton, Thomas H.

38

A Simple Optimal Power Flow Model with Energy Storage K. Mani Chandy, Steven H. Low, Ufuk Topcu and Huan Xu  

E-Print Network [OSTI]

is motivated by the intensifying trend to deploy renewable energy such as wind or solar power. In the state of California, peak demand for power in 2003 reached 52 GW, with projections for the year 2030 exceeding 80 GW% reserve margin, an additional 60 GW of new generation capacity will be needed by 2030 [9]. In 2006

Xu , Huan

39

Geometry of Power Flows in Tree Networks  

E-Print Network [OSTI]

We investigate the problem of power flow and its relationship to optimization in tree networks by looking at the injection regions of the networks. The injection region is the set of all vectors of bus power injections that satisfy the network and operation constraints. The geometrical object of interest is the set of Pareto-optimal points of the injection region, since they are the solutions to the minimization of increasing functions. If the voltage magnitudes are fixed, the injection region of a tree network can be written as a linear transformation of the product of two-bus injection regions, one for each line in the network. Using this decomposition, we show that under the practical condition that the angle difference across each line is not too large, the set of Pareto-optimal points of the injection region remains unchanged by taking the convex hull. Therefore, the optimal power flow problem can be convexified and efficiently solved. This result improves upon earlier works by removing the assumptions o...

Lavaei, Javad; Zhang, Baosen

2012-01-01T23:59:59.000Z

40

Optimal Power Dispatch via Multistage Stochastic Programming  

E-Print Network [OSTI]

Mathematical models for cost-optimal power scheduling in hydro-thermal systems often combine several di cultiesOptimal Power Dispatch via Multistage Stochastic Programming M.P. Nowak1 and W. Romisch1 Abstract. The short-term cost-optimal dispatch of electric power in a generation sys- tem under uncertain electricity

Rmisch, Werner

Note: This page contains sample records for the topic "optimal power flow" 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

Power Flow Controller for Renewables: Transformer-less Unified Power Flow Controller for Wind and Solar Power Transmission  

SciTech Connect (OSTI)

GENI Project: MSU is developing a power flow controller to improve the routing of electricity from renewable sources through existing power lines. The fast, innovative, and lightweight circuitry that MSU is incorporating into its controller will eliminate the need for a separate heavy and expensive transformer, as well as the construction of new transmission lines. MSUs controller is better suited to control power flows from distributed and intermittent wind and solar power systems than traditional transformer-based controllers are, so it will help to integrate more renewable energy into the grid. MSUs power flow controller can be installed anywhere in the existing grid to optimize energy transmission and help reduce transmission congestion.

None

2012-02-08T23:59:59.000Z

42

A Conductivity Relationship for Steady-state Unsaturated Flow Processes under Optimal Flow Conditions  

SciTech Connect (OSTI)

Optimality principles have been used for investigating physical processes in different areas. This work attempts to apply an optimal principle (that water flow resistance is minimized on global scale) to steady-state unsaturated flow processes. Based on the calculus of variations, we show that under optimal conditions, hydraulic conductivity for steady-state unsaturated flow is proportional to a power function of the magnitude of water flux. This relationship is consistent with an intuitive expectation that for an optimal water flow system, locations where relatively large water fluxes occur should correspond to relatively small resistance (or large conductance). Similar results were also obtained for hydraulic structures in river basins and tree leaves, as reported in other studies. Consistence of this theoretical result with observed fingering-flow behavior in unsaturated soils and an existing model is also demonstrated.

Liu, H. H.

2010-09-15T23:59:59.000Z

43

Power network analysis and optimization  

E-Print Network [OSTI]

hierarchical power distribution design with a power tree [T. Roy, Power distribution system design methodology andChen, 3D Power Distribution Network Co-design for Nanascale

Zhang, Wanping

2009-01-01T23:59:59.000Z

44

Sequential Methods in Solving Economic Power Flow Problems  

E-Print Network [OSTI]

Sequential Methods in Solving Economic Power Flow Problems William D. Rosehart Claudio A. Ca and an interior point quadratic programmingalgorithm that are used to solve the opti- mal power ow problem be e ectively solved by approaching the optimal solution through the feasible region. Interior point

Caizares, Claudio A.

45

gtp_flow_power_estimator.xlsx  

Broader source: Energy.gov [DOE]

This simple spreadsheet model estimates either the flow rate required to produce a specified level of power output, or the power output that can be produced from a specified flow rate.

46

Partially Adaptive Stochastic Optimization for Electric Power ...  

E-Print Network [OSTI]

Jan 3, 2015 ... Abstract: Electric Power Generation Expansion Planning (GEP) is the problem of determining an optimal construction and generation plan of...

Jikai Zou

2015-01-03T23:59:59.000Z

47

Control and Optimization Meet the Smart Power Grid: Scheduling of Power Demands for Optimal Energy  

E-Print Network [OSTI]

Control and Optimization Meet the Smart Power Grid: Scheduling of Power Demands for Optimal Energy technologies to enforce sensible use of energy through effective demand load management. We envision a scenario con- sumer power demand requests with different power require- ments, durations, and deadlines

Koutsopoulos, Iordanis

48

Flow shop scheduling with peak power consumption constraints  

E-Print Network [OSTI]

Mar 29, 2012 ... Flow shop scheduling with peak power consumption constraints ... Keywords: scheduling, flow shop, energy, peak power consumption, integer...

K. Fang

2012-03-29T23:59:59.000Z

49

Generating expansion model incorporating compact DC power flow equations  

SciTech Connect (OSTI)

This paper presents a compact method of incorporating the spatial dimension into the generation expansion problem. Compact DC power flow equations are used to provide real-power flow coordination equations. Using these equations the marginal contribution of a generator to th total system loss is formulated as a function of that generator`s output. Incorporating these flow equations directly into the MIP formulation of the generator expansion problem results in a model that captures a generator`s true net marginal cost, one that includes both the cost of generation and the cost of transport. This method contrasts with other methods that iterate between a generator expansion model and an optimal power flow model. The proposed model is very compact and has very good convergence performance. A case study with data from Kenya is used to provide a practical application to the model.

Nderitu, D.G.; Sparrow, F.T.; Yu, Z. [Purdue Inst. for Interdisciplinary Engineering Studies, West Lafayette, IN (United States)

1998-12-31T23:59:59.000Z

50

Optimal Power Allocation for Renewable Energy Source  

E-Print Network [OSTI]

Battery powered transmitters face energy constraint, replenishing their energy by a renewable energy source (like solar or wind power) can lead to longer lifetime. We consider here the problem of finding the optimal power allocation under random channel conditions for a wireless transmitter, such that rate of information transfer is maximized. Here a rechargeable battery, which is periodically charged by renewable source, is used to power the transmitter. All of above is formulated as a Markov Decision Process. Structural properties like the monotonicity of the optimal value and policy derived in this paper will be of vital importance in understanding the kind of algorithms and approximations needed in real-life scenarios. The effect of curse of dimensionality which is prevalent in Dynamic programming problems can thus be reduced. We show our results under the most general of assumptions.

Sinha, Abhinav

2011-01-01T23:59:59.000Z

51

Strategies in tower solar power plant optimization  

E-Print Network [OSTI]

A method for optimizing a central receiver solar thermal electric power plant is studied. We parametrize the plant design as a function of eleven design variables and reduce the problem of finding optimal designs to the numerical problem of finding the minimum of a function of several variables. This minimization problem is attacked with different algorithms both local and global in nature. We find that all algorithms find the same minimum of the objective function. The performance of each of the algorithms and the resulting designs are studied for two typical cases. We describe a method to evaluate the impact of design variables in the plant performance. This method will tell us what variables are key to the optimal plant design and which ones are less important. This information can be used to further improve the plant design and to accelerate the optimization procedure.

Ramos, A

2012-01-01T23:59:59.000Z

52

A Genetic Algorithm based Approach for Multi-Objective Data-Flow Graph Optimization  

E-Print Network [OSTI]

that the correct- ness of algebraic transformations realized by the underlying genetic operators selection shown for power optimization. In order to avoid inferior results caused by the counteracting demandsA Genetic Algorithm based Approach for Multi-Objective Data-Flow Graph Optimization Birger Landwehr

Coello, Carlos A. Coello

53

FLOATING-POINT BIT-WIDTH OPTIMIZATION FOR LOW-POWER SIGNAL PROCESSING APPLICATIONS  

E-Print Network [OSTI]

FLOATING-POINT BIT-WIDTH OPTIMIZATION FOR LOW-POWER SIGNAL PROCESSING APPLICATIONS Fang Fang design flow to the design of inverse discrete cosine transform (IDCT), and show that the power floating-point (FP) signal processing applications in low-power mobile devices, we propose a lightweight FP

Chen, Tsuhan

54

IEEE TRANSACTIONS ON POWER SYSTEMS 1 Application of a Stability-constrained Optimal  

E-Print Network [OSTI]

of view of power dispatch and system stability conditions, and especially locational marginal prices. Index Terms-- Electricity markets, locational marginal prices, optimal power flow, power system models. Although this technique offers a new methodology for pricing of the dynamic services provided

Cañizares, Claudio A.

55

Flow reversal power limit for the HFBR  

SciTech Connect (OSTI)

The High Flux Beam Reactor (HFBR) undergoes a buoyancy-driven reversal of flow in the reactor core following certain postulated accidents. Uncertainties about the afterheat removal capability during the flow reversal has limited the reactor operating power to 30 MW. An experimental and analytical program to address these uncertainties is described in this report. The experiments were single channel flow reversal tests under a range of conditions. The analytical phase involved simulations of the tests to benchmark the physical models and development of a criterion for dryout. The criterion is then used in simulations of reactor accidents to determine a safe operating power level. It is concluded that the limit on the HFBR operating power with respect to the issue of flow reversal is in excess of 60 MW.

Cheng, Lap Y.; Tichler, P.R.

1995-10-01T23:59:59.000Z

56

Magnetic Amplifier for Power Flow Control  

SciTech Connect (OSTI)

GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNLs controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNLs device could serve as a low-cost alternative that is equally adept at regulating power flow.

None

2012-02-24T23:59:59.000Z

57

Optimization of advanced telecommunication algorithms from power and performance perspective  

E-Print Network [OSTI]

This thesis investigates optimization of advanced telecommunication algorithms from power and performance perspectives. The algorithms chosen are MIMO and LDPC. MIMO is implemented in custom ASIC for power optimization ...

Khan, Zahid

2011-11-22T23:59:59.000Z

58

Optimal Power Dispatch via Multistage Stochastic Programming \\Lambda  

E-Print Network [OSTI]

are reported. 1 Introduction Mathematical models for costoptimal power scheduling in hydrothermal systems a shortterm optimization model for the dis patch of electric power in a hydrothermal generation systemOptimal Power Dispatch via Multistage Stochastic Programming \\Lambda M.P. Nowak 1 and W. Romisch 1

Rmisch, Werner

59

Optimal Endogenous Carbon Taxes Electric Power Supply Chains with Power Plants  

E-Print Network [OSTI]

Optimal Endogenous Carbon Taxes for Electric Power Supply Chains with Power Plants Anna Nagurney for the determination of optimal carbon taxes applied to electric power plants in the con- text of electric power supply portion of such policy inter- ventions directed at the electric power industry. The general framework

Nagurney, Anna

60

Low Power/Energy Compiler Optimizations Ulrich Kremer  

E-Print Network [OSTI]

35 Low Power/Energy Compiler Optimizations Ulrich Kremer Department of Computer Science Rutgers, Power/Energy vs. Performance, Summary 35.4 List of Optimizations Dynamic Voltage and Frequency Scaling for compilation and operating strategies to reduce power dissipation and energy usage, at the potential cost

Kremer, Ulrich

Note: This page contains sample records for the topic "optimal power flow" 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

Multi-objective optimization of solar tower power plants  

E-Print Network [OSTI]

Multi-objective optimization of solar tower power plants Pascal Richter Center for Computational · Optimization of solar tower power plants 1/20 #12;Introduction ­ Solar tower power plants Solar tower PS10 (11 MW) in Andalusia, Spain · Solar tower with receiver · Heliostat field with self-aligning mirrors

Ábrahám, Erika

62

Power Optimization and Management in Embedded Systems1 Massoud Pedram  

E-Print Network [OSTI]

1 Power Optimization and Management in Embedded Systems1 Massoud Pedram University of Southern under contract number DAAB07-00-C-L516. Abstract Power-efficient design requires reducing power on the system performance and quality of service (QoS). Power-aware high-level language compilers, dynamic power

Pedram, Massoud

63

Human Factors Aspects of Power System Flow Animation  

E-Print Network [OSTI]

into utility control centers. For example, [1] and [2] describe the on-line usage of animated flows, voltageHuman Factors Aspects of Power System Flow Animation Douglas A. Wiegmann, Gavin R. Essenberg flow information, including transmission line MW flow and power transfer distribution factor (PTDF

64

Variational principle for optimal accelerated neutralized flow A. Fruchtman  

E-Print Network [OSTI]

Variational principle for optimal accelerated neutralized flow A. Fruchtman Holon Academic Institute of Technology, 52 Golomb Street, P.O. Box 305, Holon 58102, Israel N. J. Fisch Princeton Plasma

65

Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry  

E-Print Network [OSTI]

A precision-machined cross-slot flow geometry with a shape that has been optimized by numerical simulation of the fluid kinematics is fabricated and used to measure the extensional viscosity of a dilute polymer solution. ...

Haward, Simon J.

66

Optimal Power Grid Protection through A Defender-Attacker ...  

E-Print Network [OSTI]

Feb 22, 2013 ... Optimal Power Grid Protection through A Defender-Attacker-Defender Model. Wei Yuan (weiyuan ***at*** mail.usf.edu) Long Zhao (longzhao...

Wei Yuan

2013-02-22T23:59:59.000Z

67

An integrated optimal design method for utility power distribution systems.  

E-Print Network [OSTI]

??This dissertation presents a comprehensive and integrated design methodology to optimize both the electrical and the economic performance of a utility power distribution system. The (more)

Fehr, Ralph E

2005-01-01T23:59:59.000Z

68

Optimal combined wind power forecasts using exogeneous variables  

E-Print Network [OSTI]

Optimal combined wind power forecasts using exogeneous variables Fannar ¨Orn Thordarson Kongens of the thesis is combined wind power forecasts using informations from meteorological forecasts. Lyngby, January

69

Distributed Power Flow Control: Distributed Power Flow Control using Smart Wires for Energy Routing  

SciTech Connect (OSTI)

GENI Project: Smart Wire Grid is developing a solution for controlling power flow within the electric grid to better manage unused and overall transmission capacity. The 300,000 miles of high-voltage transmission line in the U.S. today are congested and inefficient, with only around 50% of all transmission capacity utilized at any given time. Increased consumer demand should be met in part with more efficient and an economical power flow. Smart Wire Grids devices clamp onto existing transmission lines and control the flow of power withinmuch like how internet routers help allocate bandwidth throughout the web. Smart wires could support greater use of renewable energy by providing more consistent control over how that energy is routed within the grid on a real-time basis. This would lessen the concerns surrounding the grids inability to effectively store intermittent energy from renewables for later use.

None

2012-04-24T23:59:59.000Z

70

Optimal Power Schedule for Distributed MIMO Links  

E-Print Network [OSTI]

an integration of link scheduling and power control for MIMOmedium access control, space-time power scheduling. Fig. 1.

Rong, Yue; Hua, Yingbo

2008-01-01T23:59:59.000Z

71

Stochastic Co-optimization for Hydro-Electric Power Generation  

E-Print Network [OSTI]

1 Stochastic Co-optimization for Hydro-Electric Power Generation Shi-Jie Deng, Senior Member, IEEE the optimal scheduling problem faced by a hydro-electric power producer that simultaneously participates in multiple markets. Specifically, the hydro-generator participates in both the electricity spot market

72

Optimal Power Cost Management Using Stored Energy in Data Centers  

E-Print Network [OSTI]

Optimal Power Cost Management Using Stored Energy in Data Centers Rahul Urgaonkar, Bhuvan Urgaonkar of uninterrupted power supply (UPS) units as energy storage devices. This rep- resents a deviation from the usual average electric utility bill in a data center. Us- ing the technique of Lyapunov optimization, we develop

Giles, C. Lee

73

ENERGY PAYBACK OPTIMIZATION OF THERMOELECTRIC POWER GENERATOR SYSTEMS  

E-Print Network [OSTI]

and the thermoelectric module should be performed. Active cooling and the design of the heat sink are customized to findENERGY PAYBACK OPTIMIZATION OF THERMOELECTRIC POWER GENERATOR SYSTEMS Kazuaki Yazawa Dept model for optimizing thermoelectric power generation system is developed and utilized for parametric

74

Optimization Decomposition of Resistive Power Networks with Energy Storage  

E-Print Network [OSTI]

Optimization Decomposition of Resistive Power Networks with Energy Storage Xin Lou and Chee Wei Tan energy through space and time be optimized to benefit the power network with large-scale energy storage integration? With energy storage, there is a possibility to generate more energy when the demand is low

Tan, Chee Wei

75

Optimal Power Train Design of a Hybrid Refuse Collector Vehicle  

E-Print Network [OSTI]

Optimal Power Train Design of a Hybrid Refuse Collector Vehicle Tobias Knoke, Joachim Bcker 5251 60 2212 Abstract-- Due to the stop-and-go drive cycle of refuse collector vehicles, hybrid power), optimization, refuse collector vehicle I. INTRODUCTION Today, hybrid electric vehicles are accepted as a step

Paderborn, Universitt

76

Optimization Online - Solving Power-Constrained Gas ...  

E-Print Network [OSTI]

Nov 24, 2014 ... Solving Power-Constrained Gas Transportation Problems using an ... quantities but further incorporate heat power supplies and demands as...

Bjrn Geiler

2014-11-24T23:59:59.000Z

77

Objective determination of optimal power line designs.  

E-Print Network [OSTI]

??Includes abstract. The thesis investigated the possibility of overhead power line designs being decided by using an objective rather thana subjective method. Power lines are (more)

Stephen, Robert G.

2010-01-01T23:59:59.000Z

78

Distribution Power Flow in IRW Group Meeting  

E-Print Network [OSTI]

in and power out (sum of 3 phases) Power losses Power in & out A, Current in & out A, Power loss A Power in & out B, Current in & out B, Power loss B Power in & out C, Current in & out C, Power loss C Status

Tesfatsion, Leigh

79

Efficient Production Optimization Using Flow Network Models  

E-Print Network [OSTI]

of the physical processes that govern the long-term behavior of the reservoir. We present an alternative solution that combines the advantages of both statistics-based and physics-based methods by deriving the flow predictions in complex two-dimensional models...

Lerlertpakdee, Pongsathorn

2012-10-19T23:59:59.000Z

80

Optimal Scheduling of Industrial Combined Heat and Power Plants  

E-Print Network [OSTI]

Optimal Scheduling of Industrial Combined Heat and Power Plants under Time-sensitive Electricity Prices Sumit Mitra , Lige Sun , Ignacio E. Grossmann December 24, 2012 Abstract Combined heat and power companies. However, under-utilization can be a chance for tighter interaction with the power grid, which

Grossmann, Ignacio E.

Note: This page contains sample records for the topic "optimal power flow" 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

Optimal Shipboard Power System Management via Mixed Integer Dynamic Programming  

E-Print Network [OSTI]

Optimal Shipboard Power System Management via Mixed Integer Dynamic Programming Harry G. Kwatny' power systems using a logical specification to define the transition dynamics of the discrete subsystem following component failure(s) is a central goal of power system management including electric shipboard

Kwatny, Harry G.

82

Incremental Network Design with Maximum Flows - Optimization ...  

E-Print Network [OSTI]

Dec 21, 2013 ... for adding arcs to the network, (2) a performance measure, which prescribes ... network is evaluated (for instance by the shortest s-t path or by the ...... Smart grid design for efficient and flexible power networks operation and.

2013-12-21T23:59:59.000Z

83

Optimality and Conductivity for Water Flow: From Landscapes, to Unsaturated Soils, to Plant Leaves  

SciTech Connect (OSTI)

Optimality principles have been widely used in many areas. Based on an optimality principle that any flow field will tend toward a minimum in the energy dissipation rate, this work shows that there exists a unified form of conductivity relationship for three different flow systems: landscapes, unsaturated soils and plant leaves. The conductivity, the ratio of water flux to energy gradient, is a power function of water flux although the power value is system dependent. This relationship indicates that to minimize energy dissipation rate for a whole system, water flow has a small resistance (or a large conductivity) at a location of large water flux. Empirical evidence supports validity of the relationship for landscape and unsaturated soils (under gravity dominated conditions). Numerical simulation results also show that the relationship can capture the key features of hydraulic structure for a plant leaf, although more studies are needed to further confirm its validity. Especially, it is of interest that according to this relationship, hydraulic conductivity for gravity-dominated unsaturated flow, unlike that defined in the classic theories, depends on not only capillary pressure (or saturation), but also the water flux. Use of the optimality principle allows for determining useful results that are applicable to a broad range of areas involving highly non-linear processes and may not be possible to obtain from classic theories describing water flow processes.

Liu, H.H.

2012-02-23T23:59:59.000Z

84

On the distributions of seasonal river flows: Lognormal or power law?  

E-Print Network [OSTI]

of extreme events, risk assessment for water supply, and environmental flow management, among many others of hydrological engineering, including optimal design of water storage and drainage networks, management. Having diverging moments, heavy-tailed power law distributions have attracted widespread attention

Gao, Jianbo

85

Conic optimization of electric power systems  

E-Print Network [OSTI]

The electric power grid is recognized as an essential modern infrastructure that poses numerous canonical design and operational problems. Perhaps most critically, the inherently large scale of the power grid and similar ...

Taylor, Joshua Adam

2011-01-01T23:59:59.000Z

86

Combined Thermal and Power Energy Management Optimization  

E-Print Network [OSTI]

, 'various types of prime movers (e.g. boilers, waste heat recovery, steam and gas turbines, etc.), and varying requirements for process heat and electrical power, particularly if bulk power is being dispatched to a utility grid. The ability... plants are generally characterized by multiple sources of energy, 'various types of prime movers (e.g. boilers, waste heat recovery. steam and gas turbines. etc.), and varying requirements for process heat and electrical power, particularly if bulk power...

Ahner, D. J.; Priestley, R. R.

87

Transaction Based Power Flow Analysis For Transmission Utilization Allocation  

E-Print Network [OSTI]

transactions as well as the effect of reactive power on transmission losses and active power flows. Two the electric power industry moves into an era of supply competition and consumer choice, the power system electricity market at the ex ante phase; (ii) MW generations are decided by bilateral contracts and other

88

Utility system integration and optimization models for nuclear power management  

E-Print Network [OSTI]

A nuclear power management model suitable for nuclear utility systems optimization has been developed for use in multi-reactor fuel management planning over periods of up to ten years. The overall utility planning model ...

Deaton, Paul Ferris

1973-01-01T23:59:59.000Z

89

Modeling Microinverters and DC Power Optimizers in PVWatts  

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

and DC Power Optimizers in PVWatts Sara MacAlpine and Chris Deline National Renewable Energy Laboratory Technical Report NRELTP-5J00-63463 February 2015 NREL is a national...

90

Optimal Maintenance Scheduling of a Power Plant with Seasonal  

E-Print Network [OSTI]

-Wide Optimization Meeting · Plan preventive maintenance shutdowns ­ Minimize payment for skilled labor ­ Save onlineOptimal Maintenance Scheduling of a Power Plant with Seasonal Electricity Tariffs Pedro M. Castro maintenance team doing shutdowns · Shutdown period mandatory after [ , ] h online · Challenging (hard

Grossmann, Ignacio E.

91

Optimal Energy Storage Control Policies for the Smart Power Grid  

E-Print Network [OSTI]

Optimal Energy Storage Control Policies for the Smart Power Grid Iordanis Koutsopoulos Vassiliki Center for Research and Technology Hellas (CERTH), Greece Abstract--Electric energy storage devices the optimal energy storage control problem from the side of the utility operator. The operator controller

Koutsopoulos, Iordanis

92

OPTIMIZATION OF COAL PARTICLE FLOW PATTERNS IN LOW NOX BURNERS  

SciTech Connect (OSTI)

The proposed research is directed at evaluating the effect of flame aerodynamics on NO{sub x} emissions from coal fired burners in a systematic manner. This fundamental research includes both experimental and modeling efforts being performed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NO{sub x} burners to the kinetic emissions limit (below 0.2 lb./MMBTU). Experimental studies include both cold and hot flow evaluations of the following parameters: flame holder geometry, secondary air swirl, primary and secondary inlet air velocity, coal concentration in the primary air and coal particle size distribution. Hot flow experiments will also evaluate the effect of wall temperature on burner performance. Cold flow studies will be conducted with surrogate particles as well as pulverized coal. The cold flow furnace will be similar in size and geometry to the hot-flow furnace but will be designed to use a laser Doppler velocimeter/phase Doppler particle size analyzer. The results of these studies will be used to predict particle trajectories in the hot-flow furnace as well as to estimate the effect of flame holder geometry on furnace flow field. The hot-flow experiments will be conducted in a novel near-flame down-flow pulverized coal furnace. The furnace will be equipped with externally heated walls. Both reactors will be sized to minimize wall effects on particle flow fields. The cold-flow results will be compared with Fluent computation fluid dynamics model predictions and correlated with the hot-flow results with the overall goal of providing insight for novel low NO{sub x} burner geometry's.

Jost O.L. Wendt; Gregory E. Ogden; Jennifer Sinclair; Stephanus Budilarto

2001-08-20T23:59:59.000Z

93

Numerical Optimization Methodology for the Design of Power Equipment  

E-Print Network [OSTI]

health effects from overhead power line conductors [6,7]. Even though no conclusive evidence has been of utility companies have been involved in a redesign of their overhead transmission lines to avoid potentialNumerical Optimization Methodology for the Design of Power Equipment Gaurav Tewari* My M. Hua

Mamishev, Alexander

94

Optimal Power Cost Management Using Stored Energy in Data Centers  

E-Print Network [OSTI]

the aver- age price of 1 MW-Hour of electricity. Consequently, mini- mization of energy consumption needOptimal Power Cost Management Using Stored Energy in Data Centers Rahul Urgaonkar, Bhuvan Urgaonkar that arise by the use of uninterrupted power supply (UPS) units as energy storage devices. This rep- resents

Urgaonkar, Bhuvan

95

Optimal sequencing site of hydro-power stations  

SciTech Connect (OSTI)

At the first stage of a hydro-power survey of a river, it is important to select the optimal hydro-power site. The most important condition to be satisfied is to determine the optimal site where the greatest and most economical amount of hydro-energy can be obtained. This paper proposes a new method in which the optimal arrangement of the hydro-power stations is determined by a computational operation using discrete data at points along the river such as the drainage area, altitude, and distance along the river channel as obtained from topographical maps instead of drawing on engineers` experiences and the intuitions of experts. The results by this method are then compared with data on existing hydro-power stations and the results planned by expert engineers to show that this new computational method is superior.

Hayashi, T.; Yoshino, F.; Waka, R. [Tottori Univ., Koyama (Japan). Dept. of Mechanical Engineering

1995-06-01T23:59:59.000Z

96

Hybrid robust predictive optimization method of power system dispatch  

DOE Patents [OSTI]

A method of power system dispatch control solves power system dispatch problems by integrating a larger variety of generation, load and storage assets, including without limitation, combined heat and power (CHP) units, renewable generation with forecasting, controllable loads, electric, thermal and water energy storage. The method employs a predictive algorithm to dynamically schedule different assets in order to achieve global optimization and maintain the system normal operation.

Chandra, Ramu Sharat (Niskayuna, NY); Liu, Yan (Ballston Lake, NY); Bose, Sumit (Niskayuna, NY); de Bedout, Juan Manuel (West Glenville, NY)

2011-08-02T23:59:59.000Z

97

Power Grid Optimization | GE Global Research  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006PhotovoltaicSeptember 22,Reactor DecommissioningOptimization and

98

Computation of the maximum loadability of a power system using nonlinear optimization  

E-Print Network [OSTI]

Between Generator and Load. . . . . . . . . 34 E. Flowchart for Optimization Program F. Tutorial Example G. Conclusion. . 35 36 44 V SIMULATION RESULTS. 45 A. Introduction. B. Results of Simulation for Maximum Loadability of the Total System. I... of this work starting from the basics. Chapter III will cover concepts of power flow and loadability along with tutorial example. The literature survey over this topic and previous work as well as problem statement and solution method will be covered...

Khabirov, Abdufarrukh

2001-01-01T23:59:59.000Z

99

Distributed control for optimal reactive power compensation in smart microgrids  

E-Print Network [OSTI]

We consider the problem of optimal reactive power compensation for the minimization of power distribution losses in a smart microgrid. We first propose an approximate model for the power distribution network, which allows us to cast the problem into the class of convex quadratic, linearly constrained, optimization problems. We also show how this model provides the tools for a distributed approach, in which agents have a partial knowledge of the problem parameters and state, and can only perform local measurements. Then, we design a randomized, gossip-like optimization algorithm, providing conditions for convergence together with an analytic characterization of the convergence speed. The analysis shows that the best performance can be achieved when we command cooperation among agents that are neighbors in the smart microgrid topology. Numerical simulations are included to validate the proposed model and to confirm the analytic results about the performance of the proposed algorithm.

Bolognani, Saverio

2011-01-01T23:59:59.000Z

100

Power Modeling and Optimization for GPGPUs  

E-Print Network [OSTI]

Caused by the switching of transistors to charge and discharge the load capacitance, dynamic power can be calculated by the following equation: 2 d ddP aCV f? (1) Here, the activity factor, a , is a fraction between 0 and 1 indicating how often... Files .................................................................... 19 4.1 Tunneling Field Effect Transistors (TFETs) ....................................................... 19 4.2 Observation on Memory Contentions...

Li, Zhi

2013-05-31T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Optimal Maintenance Scheduling of a Gas Engine Power Plant  

E-Print Network [OSTI]

to carry out preventive maintenance at regular intervals19 . The maintenance schedule affects many short1 Optimal Maintenance Scheduling of a Gas Engine Power Plant using Generalized Disjunctive with parallel units. Gas engines are shutdown according to a regular maintenance plan that limits the number

Grossmann, Ignacio E.

102

Optimal Bidding Strategies for Wind Power Producers with Meteorological Forecasts  

E-Print Network [OSTI]

bid is computed by exploiting the forecast energy price for the day ahead market, the historical wind renewable energy resources, such as wind and photovoltaic, has grown rapidly. It is well known the problem of optimizing energy bids for an independent Wind Power Producer (WPP) taking part

Giannitrapani, Antonello

103

Optimal Demand Response Based on Utility Maximization in Power Networks  

E-Print Network [OSTI]

Optimal Demand Response Based on Utility Maximization in Power Networks Na Li, Lijun Chen different appliances including PHEVs and batteries and propose a demand response approach based on utility. The utility company can thus use dynamic pricing to coordinate demand responses to the benefit of the overall

Low, Steven H.

104

Efficient Blind Search: Optimal Power of Detection under Computational Cost  

E-Print Network [OSTI]

Efficient Blind Search: Optimal Power of Detection under Computational Cost Constraints Nicolai a blind search through a vast number of hypotheses to detect objects of interest. The number of hypotheses to test can be in the billions. A naive blind search over every single hypothesis would be far too costly

Rice, John

105

TAS: 89 0227: TAS Recovery Act - Optimization and Control of Electric Power Systems: ARRA  

SciTech Connect (OSTI)

The name SuperOPF is used to refer several projects, problem formulations and soft-ware tools intended to extend, improve and re-define some of the standard methods of optimizing electric power systems. Our work included applying primal-dual interior point methods to standard AC optimal power flow problems of large size, as well as extensions of this problem to include co-optimization of multiple scenarios. The original SuperOPF problem formulation was based on co-optimizing a base scenario along with multiple post-contingency scenarios, where all AC power flow models and constraints are enforced for each, to find optimal energy contracts, endogenously determined locational reserves and appropriate nodal energy prices for a single period optimal power flow problem with uncertainty. This led to example non-linear programming problems on the order of 1 million constraints and half a million variables. The second generation SuperOPF formulation extends this by adding multiple periods and multiple base scenarios per period. It also incorporates additional variables and constraints to model load following reserves, ramping costs, and storage resources. A third generation of the multi-period SuperOPF, adds both integer variables and a receding horizon framework in which the problem type is more challenging (mixed integer), the size is even larger, and it must be solved more frequently, pushing the limits of currently available algorithms and solvers. The consideration of transient stability constraints in optimal power flow (OPF) problems has become increasingly important in modern power systems. Transient stability constrained OPF (TSCOPF) is a nonlinear optimization problem subject to a set of algebraic and differential equations. Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability in OPF. To handle the dynamics in TSCOPF, the set of differential equations can be approximated or converted into equivalent algebraic equations before they are included in an OPF formulation. In Chapter 4, a rigorous evaluation of using a predefined and fixed threshold for rotor angles as a mean to determine transient stability of the system is developed. TSCOPF can be modeled as a large-scale nonlinear programming problem including the constraints of differential-algebraic equations (DAE). Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability constraint in OPF. Unfortunately, even the current best TSCOPF solvers still suffer from the curse of dimensionality and unacceptable computational time, especially for large-scale power systems with multiple contingencies. In chapter 5, thse issues will be addressed and a new method to incorporate the transient stability constraints will be presented.

Chiang, Hsiao-Dong

2014-02-01T23:59:59.000Z

106

Sandia National Laboratories: power flow control system  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbine bladelifetime ismobileparallelplantplasmapolymerpower flow control

107

GLOBAL OPTIMIZATION OF MULTIPHASE FLOW NETWORKS IN OIL AND GAS PRODUCTION SYSTEMS  

E-Print Network [OSTI]

1 GLOBAL OPTIMIZATION OF MULTIPHASE FLOW NETWORKS IN OIL AND GAS PRODUCTION SYSTEMS MSc. Hans in an oil production system is developed. Each well may be manipulated by injecting lift gas and adjusting in the maximum oil flow rate, water flow rate, liquid flow rate, and gas flow rate. The wells may also

Johansen, Tor Arne

108

Optimal PMU Placement Evaluation for Power System Dynamic State Estimation  

E-Print Network [OSTI]

flow along the transmission lines or transformers. · Bus power injection measurements: the real of dis- tribution systems, the line current magnitude measurements (along the transmission lines. · Current phasor measurements: the phase angles and mag- nitudes of current phasors along transmission lines

Bishop, Gary

109

Proc. IEEE PowerTech, Bucharest, June 2009. 1 Abstract-Power flow studies are typically used to determine  

E-Print Network [OSTI]

Proc. IEEE PowerTech, Bucharest, June 2009. 1 Abstract-Power flow studies are typically used, and hence reliable solution algorithms that incorporate the effect of data uncertainty into the power flow to the power flow problem with uncertainties is explained in detail, and several numerical results

Cañizares, Claudio A.

110

Heuristic Optimization for the Discrete Virtual Power Plant Dispatch Problem  

SciTech Connect (OSTI)

We consider a virtual power plant, which is given the task of dispatching a fluctuating power supply to a portfolio of flexible consumers. The flexible consumers are modeled as discrete batch processes, and the associated optimization problem is denoted the discrete virtual power plant dispatch problem (DVPPDP). First, the nondeterministic polynomial time (NP)-completeness of the discrete virtual power plant dispatch problem is proved formally. We then proceed to develop tailored versions of the meta-heuristic algorithms hill climber and greedy randomized adaptive search procedure (GRASP). The algorithms are tuned and tested on portfolios of varying sizes. We find that all the tailored algorithms perform satisfactorily in the sense that they are able to find sub-optimal, but usable, solutions to very large problems (on the order of 105 units) at computation times on the scale of just 10 s, which is far beyond the capabilities of the optimal algorithms we have tested. In particular, GRASP sorted shows with the most promising performance, as it is able to find solutions that are both agile (sorted) and well balanced, and consistently yields the best numerical performance among the developed algorithms.

Petersen, Mette K.; Hansen, Lars H.; Bendtsen, Jan; Edlund, Kristian; Stoustrup, Jakob

2014-10-17T23:59:59.000Z

111

Control and Optimization Meet the Smart Power Grid - Scheduling of Power Demands for Optimal Energy Management  

E-Print Network [OSTI]

The smart power grid aims at harnessing information and communication technologies to enhance reliability and enforce sensible use of energy. Its realization is geared by the fundamental goal of effective management of demand load. In this work, we envision a scenario with real-time communication between the operator and consumers. The grid operator controller receives requests for power demands from consumers, with different power requirement, duration, and a deadline by which it is to be completed. The objective is to devise a power demand task scheduling policy that minimizes the grid operational cost over a time horizon. The operational cost is a convex function of instantaneous power consumption and reflects the fact that each additional unit of power needed to serve demands is more expensive as demand load increases.First, we study the off-line demand scheduling problem, where parameters are fixed and known. Next, we devise a stochastic model for the case when demands are generated continually and sched...

Koutsopoulos, Iordanis

2010-01-01T23:59:59.000Z

112

Dynamic Power Flow Controller: Compact Dynamic Phase Angle Regulators for Transmission Power Routing  

SciTech Connect (OSTI)

GENI Project: Varentec is developing compact, low-cost transmission power controllers with fractional power rating for controlling power flow on transmission networks. The technology will enhance grid operations through improved use of current assets and by dramatically reducing the number of transmission lines that have to be built to meet increasing contributions of renewable energy sources like wind and solar. The proposed transmission controllers would allow for the dynamic control of voltage and power flow, improving the grids ability to dispatch power in real time to the places where it is most needed. The controllers would work as fail-safe devices whereby the grid would be restored to its present operating state in the event of a controller malfunction instead of failing outright. The ability to affordably and dynamically control power flow with adequate fail-safe switchgear could open up new competitive energy markets which are not possible under the current regulatory structure and technology base.

None

2012-01-03T23:59:59.000Z

113

Free Flow Power Corporation | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision has beenFfe2fb55-352f-473b-a2dd-50ae8b27f0a6Theoretical vsFlintFluxInputDam PoolCounty, Maryland:Power

114

OPTIMIZATION OF COAL PARTICLE FLOW PATTERNS IN LOW NOX BURNERS  

SciTech Connect (OSTI)

It is well understood that the stability of axial diffusion flames is dependent on the mixing behavior of the fuel and combustion air streams. Combustion aerodynamic texts typically describe flame stability and transitions from laminar diffusion flames to fully developed turbulent flames as a function of increasing jet velocity. Turbulent diffusion flame stability is greatly influenced by recirculation eddies that transport hot combustion gases back to the burner nozzle. This recirculation enhances mixing and heats the incoming gas streams. Models describing these recirculation eddies utilize conservation of momentum and mass assumptions. Increasing the mass flow rate of either fuel or combustion air increases both the jet velocity and momentum for a fixed burner configuration. Thus, differentiating between gas velocity and momentum is important when evaluating flame stability under various operating conditions. The research efforts described herein are part of an ongoing project directed at evaluating the effect of flame aerodynamics on NO{sub x} emissions from coal fired burners in a systematic manner. This research includes both experimental and modeling efforts being performed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NO{sub x} burners. Experimental studies include both cold-and hot-flow evaluations of the following parameters: primary and secondary inlet air velocity, coal concentration in the primary air, coal particle size distribution and flame holder geometry. Hot-flow experiments will also evaluate the effect of wall temperature on burner performance.

Jost O.L. Wendt; Gregory E. Ogden; Jennifer Sinclair; Stephanus Budilarto

2001-09-04T23:59:59.000Z

115

Optimal Distributed Voltage Regulation in Power Distribution Networks  

E-Print Network [OSTI]

In this paper, we address the problem of voltage regulation in power distribution networks with deep-penetration of distributed energy resources (DERs), e.g., renewable-based generation, and storage-capable loads such as plug-in hybrid electric vehicles. We cast the problem as an optimization program, where the objective is to minimize the losses in the network subject to constraints on bus voltage magnitudes, limits on active and reactive power injections, transmission line thermal limits and losses. We provide sufficient conditions under which the optimization problem can be solved via its convex relaxation. Using data from existing networks, we show that the conditions are expected to be satisfied by most networks. We also provide an efficient distributed algorithm to solve the problem. The algorithm is asynchronous, with a communication topology that is the same as the electrical network topology. We illustrate the algorithm's performance in the IEEE 34-bus and the 123-bus feeder test systems.

Lam, Albert Y S; Dominguez-Garcia, Alejandro; Tse, David

2012-01-01T23:59:59.000Z

116

Optimal Reactive Power Dispatch in Real-Time S. Salamat Sharif1  

E-Print Network [OSTI]

) an improvement in the volt- age profile and voltage stability, and 2) a savings in ac- tive power loss of view. A reduction in active power loss gained from ORPD can save a significant amount of money reactive power dispatch, power loss minimization, optimization methods 1 Introduction Optimal power

Taylor, James H.

117

Optimization of a solar powered absorption cycle under Abu Dhabi's weather conditions  

SciTech Connect (OSTI)

In order for the solar absorption air conditioners to become a real alternative to the conventional vapour compression systems, their performance has to be improved and their total cost has to be reduced. A solar powered absorption cycle is modeled using the Transient System Simulation (TRNSYS) program and Typical Meteorological Year 2 data of Abu Dhabi. It uses evacuated tube collectors to drive a 10 kW ammonia-water absorption chiller. Firstly, the system performance and its total cost are optimized separately using single objective optimization algorithms. The design variables considered are: the collector slope, the collector mass flow rate, the collector area and the storage tank volume. The single objective optimization results show that MATLAB global optimization methods agree with the TRNSYS optimizer. Secondly, MATLAB is used to solve a multi-objective optimization problem to improve the system's performance and cost, simultaneously. The optimum designs are presented using Pareto curve and show the potential improvements of the baseline system. (author)

Al-Alili, A.; Hwang, Y.; Radermacher, R. [Department of Mechanical Engineering, University of Maryland, College Park, MD (United States); Kubo, I. [Department of Mechanical Engineering, The Petroleum Institute, Abu Dhabi (United Arab Emirates)

2010-12-15T23:59:59.000Z

118

A NEW PEMFC FLOW FIELD PLATE OPTIMIZATION COMPARISON - ANSYS FLUENT FUEL-CELL SIMULATION.  

E-Print Network [OSTI]

??The performance of a new cathode flow field plate located on a PEM fuel cell was compared to an industry standard and optimal serpentine design (more)

Soueidan, Ahmed Yassin

2012-01-01T23:59:59.000Z

119

Domain Decomposition Methods in Optimal Flow Control for High Performance Computing.  

E-Print Network [OSTI]

??This thesis is concerned with linear and non-linear optimal flow control problems which are modeled by systems of partial differential equations. The numerical treatment of (more)

Ketelaer, Eva

2013-01-01T23:59:59.000Z

120

Interpreting Horizontal Well Flow Profiles and Optimizing Well Performance by Downhole Temperature and Pressure Data  

E-Print Network [OSTI]

be used to obtain downhole flow conditions, which is key information to control and optimize horizontal well production. However, the fluid flow in the reservoir is often multiphase and complex, which makes temperature and pressure interpretation very...

Li, Zhuoyi

2011-02-22T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Optimal timeouts for power management under renewal or hidden Markov processes for requests  

E-Print Network [OSTI]

.g. laser, solid ink) and is usually larger than the power consumption in idle mode. In the sequelOptimal timeouts for power management under renewal or hidden Markov processes for requests Victor mode, so as to optimize a trade-off between power consumption and user impact. The optimal timeout

122

A Fine-Grained Analysis of the Performance and Power Benefits of Compiler Optimizations for Embedded  

E-Print Network [OSTI]

optimization phase inside of an adaptive dynamic optimizer if power consumption is of importance. 1 grant. is achieved by hand programming various transformations in PowerPC assembly. Specifically, weA Fine-Grained Analysis of the Performance and Power Benefits of Compiler Optimizations

Giesbrecht, Mark

123

POWER FLOW ANALYSIS OF ELECTROSTRICTIVE ACTUATORS DRIVEN BYSWITCHMODE AMPLIFIERS  

E-Print Network [OSTI]

the actuator. INTRODUCTION Smart materials or smart structures are materials that contain actuators, sensors@vt.edu Journal on Intelligent Material Systems and Structures Vol. 9, No 3, March, 1998 pp. 210 - 222. Keywords: smart structures, smart skin, switchmode amplifiers, power flow analysis, electrostrictive actuators

Lindner, Douglas K.

124

Probabilistic Vulnerability Assessment Based on Power Flow and Voltage Distribution  

SciTech Connect (OSTI)

Risk assessment of large scale power systems has been an important problem in power system reliability study. Probabilistic technique provides a powerful tool to solve the task. In this paper, we present the results of a study on probabilistic vulnerability assessment on WECC system. Cumulant based expansion method is applied to obtain the probabilistic distribution function (PDF) and cumulative distribution function (CDF) of power flows on transmission lines and voltage. Overall risk index based on the system vulnerability analysis is calculated using the WECC system. The simulation results based on WECC system is used to demonstrate the effectiveness of the method. The methodology can be applied to the risk analysis on large scale power systems.

Ma, Jian; Huang, Zhenyu; Wong, Pak C.; Ferryman, Thomas A.

2010-04-30T23:59:59.000Z

125

Optimizing with constraints: a case study in scheduling maintenance of electric power units  

E-Print Network [OSTI]

industry is that of optimally schedul­ ing preventative maintenance of power generating units within of the electric power industry: optimally scheduling preventative maintenance of power generating units within or two dozen power generating units which can be individually scheduled for preventive maintenance. Both

Dechter, Rina

126

Optimizing with constraints: a case study in scheduling maintenance of electric power units  

E-Print Network [OSTI]

is that of optimally schedul- ing preventative maintenance of power generating units within a power plant. We show how: optimally scheduling preventative maintenance of power generating units within a power plant. We de ne can be individually scheduled for preventive maintenance. Both the required duration of each unit

Dechter, Rina

127

Optimal Power Market Participation of Plug-In Electric Vehicles Pooled by Distribution Feeder  

E-Print Network [OSTI]

Transactions on Power Systems #12;WORKING PAPER 1 Optimal Power Market Participation of Plug-In ElectricOptimal Power Market Participation of Plug-In Electric Vehicles Pooled by Distribution Feeder Journal: IEEE Transactions on Power Systems Manuscript ID: TPWRS-00431-2011.R3 Manuscript Type

Caramanis, Michael

128

A Comparison of the AC and DC Power Flow Models for LMP Calculations  

E-Print Network [OSTI]

A Comparison of the AC and DC Power Flow Models for LMP Calculations Thomas J. Overbye, Xu Cheng power flow model for LMP-based market calculations. The paper first provides a general discussion of balanced, three phase, electric power transmission networks is through the solution of the power flow. From

129

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

be realized by capturing wind power at altitudes over the2011. [2] , High altitude wind power systems: A survey onOckels, Optimal cross-wind towing and power generation with

Ghaffari, Azad

2013-01-01T23:59:59.000Z

130

Power Saving Optimization for Linear Collider Interaction Region Parameters  

SciTech Connect (OSTI)

Optimization of Interaction Region parameters of a TeV energy scale linear collider has to take into account constraints defined by phenomena such as beam-beam focusing forces, beamstrahlung radiation, and hour-glass effect. With those constraints, achieving a desired luminosity of about 2E34 would require use of e{sup +}e{sup -} beams with about 10 MW average power. Application of the 'travelling focus' regime may allow the required beam power to be reduced by at least a factor of two, helping reduce the cost of the collider, while keeping the beamstrahlung energy loss reasonably low. The technique is illustrated for the 500 GeV CM parameters of the International Linear Collider. This technique may also in principle allow recycling the e{sup +}e{sup -} beams and/or recuperation of their energy.

Seryi, Andrei; /SLAC

2009-10-30T23:59:59.000Z

131

Power Optimization Using Divide-and-Conquer Techniques for Minimization of  

E-Print Network [OSTI]

Power Optimization Using Divide-and- Conquer Techniques for Minimization of the Number University of Massachusetts at Amherst We introduce an approach for power optimization using a set-and-conquer compilation technique to minimize the number of operations for general computations. Our technique optimizes

Potkonjak, Miodrag

132

SYSTEMS STUDIES AND OPTIMIZATION OF THE ARIES-CS POWER PLANT  

E-Print Network [OSTI]

SYSTEMS STUDIES AND OPTIMIZATION OF THE ARIES-CS POWER PLANT J. F. LYON,*a L. P. KU,b L. EL 10, 2007 A stellarator systems/optimization code is used to optimize the ARIES-CS fusion power plant-vessel component con- straints for a compact stellarator configuration. Differ- ent physics models, reactor

California at San Diego, University of

133

Self-Optimization in Mobile Cellular Networks: Power Control and User Association  

E-Print Network [OSTI]

Self-Optimization in Mobile Cellular Networks: Power Control and User Association Chung Shue Chen develop mathematical and algorith- mic tools for the self-optimization of mobile cellular networks the wireless devices are proposed. We focus on the optimization of transmit power and of user association

Paris-Sud XI, Université de

134

Self-Optimization of Antenna Tilt and Pilot Power for Dedicated Channels  

E-Print Network [OSTI]

Self-Optimization of Antenna Tilt and Pilot Power for Dedicated Channels Abstract-- In Radio Access Networks (RAN), fixed configurations result in poor network efficiency. This sub- optimal performance present a framework for a self-optimizing RAN, which adapts Antenna Tilt and Pilot Power according

Paris-Sud XI, Université de

135

Optimization of a Steady-State Tokamak-Based Power Plant  

E-Print Network [OSTI]

Optimization of a Steady-State Tokamak-Based Power Plant Farrokh Najmabadi University of California, San Diego, La Jolla, CA IEA Workshop 59 "Shape and aspect ratio optimization for high , steady between a physics optimization and an integrated systems optimization Identify key impact of physics

136

Optimization of Wind Power and Its Variability With a Computational Intelligence Approach  

E-Print Network [OSTI]

Optimization of Wind Power and Its Variability With a Computational Intelligence Approach Zijun is presented for maximizing the generation of wind power while minimizing its variability. In the optimization model, data-driven approaches are used to model the wind-power generation process based on industrial

Kusiak, Andrew

137

Power optimization of wind turbines with data mining and evolutionary computation  

E-Print Network [OSTI]

Power optimization of wind turbines with data mining and evolutionary computation Andrew Kusiak July 2009 Accepted 25 August 2009 Available online 17 September 2009 Keywords: Wind turbine Data mining for maximization of the power produced by wind turbines is presented. The power optimization objective

Kusiak, Andrew

138

Optimization of inflow waveform phase-difference for minimized total cavopulmonary power loss  

E-Print Network [OSTI]

Optimization of inflow waveform phase-difference for minimized total cavopulmonary power loss minimized power loss, inside the TCPC pathway is required for the best optimal surgical outcomes we focused on the characterization of power loss changes due to the temporal variations in between

Pekkan, Kerem

139

Joint Power Control and Link Scheduling in Wireless Networks for Throughput Optimization  

E-Print Network [OSTI]

Joint Power Control and Link Scheduling in Wireless Networks for Throughput Optimization Liqun Fu formulate the general joint link scheduling and power control problem as an in- teger linear programming optimality. Index Terms--scheduling, power control, SINR constraints. I. INTRODUCTION Due to their unconfined

Huang, Jianwei

140

1066 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 18, NO. 3, JULY 2003 P Characteristics for the Unified Power Flow  

E-Print Network [OSTI]

for the Unified Power Flow Controller--Analysis Inclusive of Equipment Ratings and Line Limits J. Z. Bebic, Member curves, power system dynamic stability, UPFC. I. INTRODUCTION THE UNIFIED power flow controller (UPFC) enables in- dependent and simultaneous control of a transmission line voltage, impedance, and phase angle

Lehn, Peter W.

Note: This page contains sample records for the topic "optimal power flow" 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

Optimization and hybridization of membrane-based oxy-combustion power plants  

E-Print Network [OSTI]

This thesis considers the optimization and hybridization of advanced zero emissions power (AZEP) cycles. More specifically, existing flowsheets for zero and partial emissions are optimized, and new integration schemes with ...

Gunasekaran, Surekha

2013-01-01T23:59:59.000Z

142

Balancing of Wind Power - Optimization of power systems which include wind power systems.  

E-Print Network [OSTI]

?? In the future, renewable energy share, especially wind power share, in electricity generation is expected to increase. Due to nature of the wind, wind (more)

lker, Muhammed Akif

2011-01-01T23:59:59.000Z

143

Optimal Contract for Wind Power in Day-Ahead Electricity Markets  

E-Print Network [OSTI]

Optimal Contract for Wind Power in Day-Ahead Electricity Markets Desmond W. H. Cai1 Sachin Adlakha2 integration in current electric power systems. In this work, we study how a wind power producer can bid wind power producer will produce as much as wind power is available (up to its contract size). 1

Adlakha, Sachin

144

Optimal Design of Power-Split Transmissions for Hydraulic Hybrid Passenger Vehicles  

E-Print Network [OSTI]

Optimal Design of Power-Split Transmissions for Hydraulic Hybrid Passenger Vehicles Kai Loon Cheong, Perry Y. Li and Thomas R. Chase Abstract-- Hydraulic hybrid vehicles are inherently power dense. Power and input coupled power-split configurations. Keywords: Hybrid vehicles, hydraulics, power-split, engine

Li, Perry Y.

145

Modified Centrality Measure Based on Bidirectional Power Flow for Smart and Bulk Power  

E-Print Network [OSTI]

the directionality of power flow of future smart grid. Appli- cability of the proposed method has been evaluated smart and new technologies by utilities [1]. The scope of smart grid includes various generation options systems is the most lucrative part of smart grid from the point of view of regulating energy usage. Excess

Pota, Himanshu Roy

146

Journal of Power Sources xxx (2005) xxxxxx POWER (power optimization for wireless energy requirements): A  

E-Print Network [OSTI]

, and lifetime in selection of appropriate battery electro- chemistries and configurations (i.e. parallel, series several power ranges (micro-, milli- and Watt); or (3) a power system designed to be housed within-charge of the batteries). Future work will be focused on continuously improving our present tool. 2005 Elsevier B.V. All

Sastry, Ann Marie

2005-01-01T23:59:59.000Z

147

Optimizing interventions for the treatment of vascular flow disruptions  

E-Print Network [OSTI]

All tissues rely on perfusion and therefore intact blood flow. When flow is disrupted the coupled interaction between the functional and fluid domains of a tissue is impeded and viability is lost. Aortic stenosis is a ...

Boval, Brett Lawrence

2014-01-01T23:59:59.000Z

148

A Global Optimization Approach to the Design of Solar Power Plants  

E-Print Network [OSTI]

Apr 1, 2014 ... Abstract: A method for optimizing a Solar Power Tower system is proposed, in which both the location of the heliostats and the characteristics of...

E. Carrizosa

2014-04-01T23:59:59.000Z

149

A Global Optimization Approach to the Design of Solar Power Plants  

E-Print Network [OSTI]

May 8, 2014 ... A method for optimizing a Solar Power Tower system is proposed, ... at a high temperature is then transferred to the heat transfer fluid to...

2014-05-08T23:59:59.000Z

150

Power Optimization in Programmable Processors and ASIC Implementations of Linear Systems: Transformation-based Approach  

E-Print Network [OSTI]

Power Optimization in Programmable Processors and ASIC Implementations of Linear Systems and communications. We introduce two approaches for power minimization in linear computations using transformations: Transformation-based Approach Mani Srivastava Miodrag Potkonjak AT&T Bell Laboratories Computer Science

Potkonjak, Miodrag

151

Security Constrained Optimal Power Flow via Proximal Message Passing  

E-Print Network [OSTI]

--Alternating Direction Method of Multipliers (ADMM), Locational Marginal Price (LMP), Augmented La- grangian, Shift

152

Thermal Unit Commitment Including Optimal AC Power Flow Constraints  

E-Print Network [OSTI]

iteration to another. The complexity of a given iteration becomes linear in the number of generators instead of the coupling between generator time- spanning constraints and system-wide instantaneous constraints, suers from combinatoric complexity as the number of generators increases. It is this feature that dooms

153

A parallel textured algorithm for optimal power flow  

E-Print Network [OSTI]

125 LIST OF FIGURES FIGURE Pa. ge A 4-bus system. . 17 A 5-bus system X. The textured decomposition of system X. 25 System V The textured decomposition of system V. System W. The textured decomposition of system 1V. 48 System X...

Hsieh, Shih-Chieh

1992-01-01T23:59:59.000Z

154

Optimization Online - Achieving Cost-Effective Power Grid ...  

E-Print Network [OSTI]

Dec 29, 2014 ... Abstract: Vulnerability of power grid is a critical issue in power industry. In order to understand and reduce power grid vulnerability under...

Wei Yuan

2014-12-29T23:59:59.000Z

155

Catalytic conversion of glycerol to oxygenated fuel additive in a continuous flow reactor: Process optimization  

E-Print Network [OSTI]

Catalytic conversion of glycerol to oxygenated fuel additive in a continuous flow reactor: Process optimization Malaya R. Nanda a , Zhongshun Yuan a , Wensheng Qin b , Hassan S. Ghaziaskar c , Marc for synthesis of solketal from glycerol was optimized. A maximum yield of 94 ± 2% was obtained at optimum

Qin, Wensheng

156

Optimal transition from coal to gas and renewable power under capacity constraints and adjustment costs  

E-Print Network [OSTI]

Optimal transition from coal to gas and renewable power under capacity constraints and adjustment existing coal power plants to gas and renewable power under a carbon budget. It solves a model of polluting, exhaustible resources with capacity constraints and adjustment costs (to build coal, gas, and renewable power

Paris-Sud XI, Université de

157

Stochastic Modeling of a Power-Managed System: Construction and Optimization  

E-Print Network [OSTI]

Stochastic Modeling of a Power-Managed System: Construction and Optimization Qinru Qiu, Qing Wu of a power-managed electronic system. We formulate the problem of system-level power management improvements. Dynamic power management ­ which refers to selective shut-off or slow-down of system components

Qiu, Qinru

158

Stochastic Modeling of a Power-Managed System: Construction and Optimization  

E-Print Network [OSTI]

1 Stochastic Modeling of a Power-Managed System: Construction and Optimization Qinru Qiu, Qing Wu of a power-managed electronic system. We formulate the problem of system-level power management-digital components. Dynamic power management ­ which refers to a selective shut-off or slow-down of system components

Pedram, Massoud

159

Power Generation Loading Optimization using a Multi-Objective Constraint-Handling Method via  

E-Print Network [OSTI]

results of the power generation loading optimization based on a coal-fired power plant demonstrates algorithm in solving significant industrial problems. I. INTRODUCTION Most power generation plants have.e., heat rate/NOx vs. load, for a given plant condition. There are two objectives for the power generation

Li, Xiaodong

160

An Integrated Approach for Optimal Coordination of Wind Power and Hydro Pumping Storage  

E-Print Network [OSTI]

1 An Integrated Approach for Optimal Coordination of Wind Power and Hydro Pumping Storage Edgardo D of the integrated system. Keywords: wind power, generation dispatch, pumped storage, hydro generation, deterministic is the active power delivered by the wind-hydro plant, during interval i; PHi is the active power produced

Paris-Sud XI, Universit de

Note: This page contains sample records for the topic "optimal power flow" 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

Journal of Power Sources 159 (2006) 758780 POWER (power optimization for wireless energy requirements): A  

E-Print Network [OSTI]

, and lifetime in selection of appropriate battery electro- chemistries and configurations (i.e. parallel, series to be housed within specified spaces within the system. POWER was verified by conducting two case studies-charge of the batteries). Future work will be focused on continuously improving our present tool. 2005 Elsevier B.V. All

Sastry, Ann Marie

2006-01-01T23:59:59.000Z

162

Power system analysis project Modeling and Sizing optimization of Stand-alone  

E-Print Network [OSTI]

Power system analysis project Modeling and Sizing optimization of Stand-alone photovoltaic/wind-in, cut-out wind speed and rated power, into the optimization based on the real load of the site and write wind turbine is used to adopt its advantage of low noise and relatively low requirement of the quality

Lavaei, Javad

163

Optimal Power Policy for Energy Harvesting Transmitters with Inefficient Energy Storage  

E-Print Network [OSTI]

1 Optimal Power Policy for Energy Harvesting Transmitters with Inefficient Energy Storage Kaya with an inefficient energy storage device, i.e., battery or capacitor, is considered, where a fraction of the stored for optimal power allocations with energy harvesting transmitters, it is observed that storage losses

Yener, Aylin

164

Thermal Efficiency Optimization for Industrial Power Plants Under Load Fluctuations Using Fuzzy Logic  

E-Print Network [OSTI]

-time monitoring, optimization and control of a hydroelectric generation complex. IEEE Transactions on Power Systems, Vol 3 No.2 Nov. 1988 p 1768-1783. (2] Nakamura H., Toyota Y., Kushihashi M., Uchida M., Optimal control of Thermal Power Plants. Journal...

Steffenhagan, W.; de Sam Lazaro, A.

165

Automatic Layout Optimization of a Double Sided Power Module Regarding Thermal and EMC constraints  

E-Print Network [OSTI]

Automatic Layout Optimization of a Double Sided Power Module Regarding Thermal and EMC constraints. The chip position and power layout is automatically generated according to the best EMC/Thermal trade off. Optimization techniques use simple but fairly accurate EMC and Thermal models, presented in this paper

Paris-Sud XI, Université de

166

Heuristically Optimized Trade-Offs: A New Paradigm for Power Laws in the Internet  

E-Print Network [OSTI]

­122, 2002. c Springer-Verlag Berlin Heidelberg 2002 #12;Heuristically Optimized Trade-Offs 111 Power lawsHeuristically Optimized Trade-Offs: A New Paradigm for Power Laws in the Internet Alex Fabrikant1 , Elias Koutsoupias2 , and Christos H. Papadimitriou1 1 Computer Science Division University of California

Fabrikant, Alex

167

A fast global optimization approach to VAR planning for the large scale electric power systems  

SciTech Connect (OSTI)

In this paper, an innovative fast global optimization technique, Hybrid Partial Gradient Descent/Simulated Annealing (HPGDSA), for optimal VAR planning is presented. The HPGDSA is introduced to search the global optimal solution considering both quality and speed at the same time. The basic idea of the HPGDSA is that partial gradient descent and simulated annealing alternate with each other such that it reduces the CPU time of the conventional Simulated Annealing (SA) method while retaining the main characteristics of SA, i.e., the ability to get the global optimal solution. The HPGDSA was applied to a practical power system, Taiwan Power System (Tai-Power System), with satisfactory results.

Liu, C.W.; Jwo, W.S.; Liu, C.C. [National Taiwan Univ., Taipei (Taiwan, Province of China). Dept. of Electrical Engineering; Hsiao, Y.T. [Tamkang Univ., Taipei (Taiwan, Province of China). Dept. of Electrical Engineering

1997-02-01T23:59:59.000Z

168

Probability-Based Software for Grid Optimization: Improved Power System Operations Using Advanced Stochastic Optimization  

SciTech Connect (OSTI)

GENI Project: Sandia National Laboratories is working with several commercial and university partners to develop software for market management systems (MMSs) that enable greater use of renewable energy sources throughout the grid. MMSs are used to securely and optimally determine which energy resources should be used to service energy demand across the country. Contributions of electricity to the grid from renewable energy sources such as wind and solar are intermittent, introducing complications for MMSs, which have trouble accommodating the multiple sources of price and supply uncertainties associated with bringing these new types of energy into the grid. Sandias software will bring a new, probability-based formulation to account for these uncertainties. By factoring in various probability scenarios for electricity production from renewable energy sources in real time, Sandias formula can reduce the risk of inefficient electricity transmission, save ratepayers money, conserve power, and support the future use of renewable energy.

None

2012-02-24T23:59:59.000Z

169

The Hybrid Power Flow Controller A New Concept for Flexible AC Transmission  

E-Print Network [OSTI]

The Hybrid Power Flow Controller A New Concept for Flexible AC Transmission Jovan Z. Bebic Electric flow controller topologies are proposed for flexible AC transmission systems (FACTS). The first one or series capacitors can be enhanced to generalized power flow control ­ a functionality commonly associated

Lehn, Peter W.

170

Finding Benefits by Modeling and Optimizing Steam and Power Systems  

E-Print Network [OSTI]

A site-wide steam modeling and optimization program (Visual MESA) was implemented at the INEOS Chocolate Bayou site. This program optimizes steam production, compressor turbine extraction, pump operation (turbine/motor) operation, as well...

Jones, B.; Nelson, D.

2007-01-01T23:59:59.000Z

171

Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions  

E-Print Network [OSTI]

Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions by Carl, Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions KTH Nuclear Reactor power is limited by a phenomenon called critical heat flux (CHF). It appears as a sudden detoriation

Haviland, David

172

Magnetoelectric-field helicities and reactive power flows  

E-Print Network [OSTI]

The dual symmetry between the electric and magnetic fields underlies Maxwell's electrodynamics. Due to this symmetry one can describe topological properties of an electromagnetic field in free space and obtain the conservation law of optical (electromagnetic) helicity. What kind of the field helicity one can expect to see when the electromagnetic-field symmetry is broken? The near fields originated from small ferrite particles with magnetic dipolar mode (MDM) oscillations are the fields with the electric and magnetic components, but with broken dual (electric-magnetic) symmetry. These fields, called magnetoelectric (ME) fields, have topological properties different from such properties of electromagnetic fields. The helicity states of ME fields are topologically protected quantum like states. In this paper, we study the helicity properties of ME fields. We analyze conservation laws of the ME-field helicity and show that the helicity density is related to an imaginary part of the complex power flow density. We...

Kamenetskii, E O; Shavit, R

2015-01-01T23:59:59.000Z

173

Precision control of high temperature furnaces using an auxiliary power supply and charged practice current flow  

DOE Patents [OSTI]

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved.

Pollock, George G. (San Ramon, CA)

1997-01-01T23:59:59.000Z

174

Precision control of high temperature furnaces using an auxiliary power supply and charged particle current flow  

DOE Patents [OSTI]

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. 5 figs.

Pollock, G.G.

1997-01-28T23:59:59.000Z

175

Two-Stage Robust Power Grid Optimization Problem  

E-Print Network [OSTI]

adjusts the economic dispatch amount of each online power generation unit, in order to ... which has a significant share of combined heat and power units.

2011-01-02T23:59:59.000Z

176

E-Print Network 3.0 - active power flow Sample Search Results  

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

Energy Storage, Conversion and Utilization 8 IEEE INFOCOM 2000 1 Effortlimited Fair (ELF) Scheduling for Wireless Summary: on each flow using a per-flow power factor setting. The...

177

E-Print Network 3.0 - acoustic-to-structure power flow Sample...  

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

Energy Storage, Conversion and Utilization 4 IEEE INFOCOM 2000 1 Effortlimited Fair (ELF) Scheduling for Wireless Summary: on each flow using a per-flow power factor setting. The...

178

OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS,  

E-Print Network [OSTI]

-producers. Decentralized Power Generation (DPG) refers to an electric power source such as solar, wind or combined heat (the approach used in the traditional electric power paradigm), DPG systems employ numerous, but small¨EL BLOEMHOF, JOOST BOSMAN§, DAAN CROMMELIN¶, JASON FRANK , AND GUANGYUAN YANG Abstract. In electrical power

Frank, Jason

179

Exploiting Schedule Slacks for RateOptimal PowerMinimum Software Pipelining #  

E-Print Network [OSTI]

­engineered compiler on Wattch power simulator, we observe that our approach can reduce dynamic energy consumptionExploiting Schedule Slacks for Rate­Optimal Power­Minimum Software Pipelining # Hongbo Yang + R systems de­ mand new compiler techniques geared toward both high performance and low power. Software

Gao, Guang R.

180

Stochastic Modeling and Optimization for Robust Power Management in a Partially Observable System  

E-Print Network [OSTI]

or hard disk. The power management hardware/software monitors the state transition in the systemStochastic Modeling and Optimization for Robust Power Management in a Partially Observable System As the hardware and software complexity grows, it is unlikely for the power management hardware/software to have

Qiu, Qinru

Note: This page contains sample records for the topic "optimal power flow" 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

Passive Acoustic Detection of Wind Turbine In-Flow Conditions for Active Control and Optimization  

SciTech Connect (OSTI)

Wind is a significant source of energy; however, the human capability to produce electrical energy still has many hurdles to overcome. One of these is the unpredictability of the winds in the atmospheric boundary layer (ABL). The ABL is highly turbulent in both stable and unstable conditions (based on the vertical temperature profile) and the resulting fluctuations can have a dramatic impact on wind turbine operation. Any method by which these fluctuations could be observed, estimated, or predicted could provide a benefit to the wind energy industry as a whole. Based on the fundamental coupling of velocity fluctuations to pressure fluctuations in the nearly incompressible flow in the ABL, This work hypothesizes that a ground-based array of infrasonic pressure transducers could be employed to estimate the vertical wind profile over a height relevant for wind turbines. To analyze this hypothesis, experiments and field deployments were conducted. Wind tunnel experiments were performed for a thick turbulent boundary layer over a neutral or heated surface. Surface pressure and velocity probe measurements were acquired simultaneously. Two field deployments yielded surface pressure data from a 49 element array. The second deployment at the Reese Technology Center in Lubbock, TX, also included data from a smaller aperture, 96-element array and a 200-meter tall meteorological tower. Analysis of the data successfully demonstrated the ability to estimate the vertical velocity profile using coherence data from the pressure array. Also, dynamical systems analysis methods were successful in identifying and tracking a gust type event. In addition to the passive acoustic profiling method, this program also investigated a rapid response Doppler SODAR system, the optimization of wind turbine blades for enhanced power with reduced aeroacoustic noise production, and the implementation of a wireless health monitoring system for the wind turbine blades. Each of these other objectives was met successfully. The use of phase unwrapping applied to SODAR data was found to yield reasonable results for per-pulse measurements. A health monitoring system design analysis was able to demonstrate the ability to use a very small number of sensors to monitor blade health based on the blade's overall structural modes. Most notable was the development of a multi-objective optimization methodology that successfully yielded an aerodynamic blade design that produces greater power output with reduced aerodynamic loading noise. This optimization method could be significant for future design work.

Murray, Nathan E.

2012-03-12T23:59:59.000Z

182

Optimization of Multiple Receivers Solar Power Tower systems  

E-Print Network [OSTI]

Mar 26, 2015 ... ... as well as the heliostat field layout, seeking to minimize the levelized cost of thermal energy. The optimization problem is high dimensional,...

Emilio Carrizosa

2015-03-26T23:59:59.000Z

183

A Set-Theoretic Framework to Assess the Impact of Variable Generation on the Power Flow  

E-Print Network [OSTI]

penetration of renewable resources of electricity, such as wind and solar, into existing power systems. Since renewable resources vary in rated power output and point of grid interconnection, they affect power systems1 A Set-Theoretic Framework to Assess the Impact of Variable Generation on the Power Flow Xichen

Liberzon, Daniel

184

Optimization of the axial power shape in pressurized water reactors  

E-Print Network [OSTI]

Analytical and numerical methods have been applied to find the optimum axial power profile in a PWR with respect to uranium utilization. The preferred shape was found to have a large central region of uniform power density, ...

Melik, M. A.

1981-01-01T23:59:59.000Z

185

Optimal PMU Placement Evaluation for Power System Dynamic State Estimation  

SciTech Connect (OSTI)

Abstract - The synchronized phaor measurements unit (PMU), developed in the 1980s, is concidered to be one of the most important devices in the future of power systems. The recent development of PMU technology provides high-speed, precisely synchronized sensor data, which has been found to be usefule for dynamic, state estimation of power the power grid.

Zhang, Jinghe; Welch, Greg; Bishop, Gary; Huang, Zhenyu

2010-10-10T23:59:59.000Z

186

Optimal distributed power generation under network load constraints  

E-Print Network [OSTI]

wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, mainly because of the development of novel components for decentral power generation (solar panels, small (DPG) refers to an electric power source such as solar, wind or combined heat power (CHP) connected

Utrecht, Universiteit

187

The Application of Robust Optimization in Power Systems  

E-Print Network [OSTI]

Engineering Research Center Empowering Minds to Engineer the Future Electric Energy System #12;#12;The.Hedman@asu.edu Power Systems Engineering Research Center The Power Systems Engineering Research Center (PSERC) is a multi-university Center con- ducting research on challenges facing the electric power industry

188

Optimal Power Allocation in Channel-Coded Wireless Sudarshan Vasudevan  

E-Print Network [OSTI]

energy. However, for many communication links, such as those employing turbo codes or sequentially transmitted RF power for receiver decoder power can result in significant improvements in overall energy transmission. The gains are particularly pronounced in wireless networks with asymmetric power costs. 1

Massachusetts at Amherst, University of

189

Optimal Power Allocation in ChannelCoded Wireless Sudarshan Vasudevan  

E-Print Network [OSTI]

energy. However, for many communication links, such as those employing turbo codes or sequentially transmitted RF power for receiver decoder power can result in significant improvements in overall energy transmission. The gains are particularly pronounced in wireless networks with asymmetric power costs. 1

Massachusetts at Amherst, University of

190

Time series power flow analysis for distribution connected PV generation.  

SciTech Connect (OSTI)

Distributed photovoltaic (PV) projects must go through an interconnection study process before connecting to the distribution grid. These studies are intended to identify the likely impacts and mitigation alternatives. In the majority of the cases, system impacts can be ruled out or mitigation can be identified without an involved study, through a screening process or a simple supplemental review study. For some proposed projects, expensive and time-consuming interconnection studies are required. The challenges to performing the studies are twofold. First, every study scenario is potentially unique, as the studies are often highly specific to the amount of PV generation capacity that varies greatly from feeder to feeder and is often unevenly distributed along the same feeder. This can cause location-specific impacts and mitigations. The second challenge is the inherent variability in PV power output which can interact with feeder operation in complex ways, by affecting the operation of voltage regulation and protection devices. The typical simulation tools and methods in use today for distribution system planning are often not adequate to accurately assess these potential impacts. This report demonstrates how quasi-static time series (QSTS) simulation and high time-resolution data can be used to assess the potential impacts in a more comprehensive manner. The QSTS simulations are applied to a set of sample feeders with high PV deployment to illustrate the usefulness of the approach. The report describes methods that can help determine how PV affects distribution system operations. The simulation results are focused on enhancing the understanding of the underlying technical issues. The examples also highlight the steps needed to perform QSTS simulation and describe the data needed to drive the simulations. The goal of this report is to make the methodology of time series power flow analysis readily accessible to utilities and others responsible for evaluating potential PV impacts.

Broderick, Robert Joseph; Quiroz, Jimmy Edward; Ellis, Abraham; Reno, Matthew J. [Georgia Institute of Technology, Atlanta, GA; Smith, Jeff [Electric Power Research Institute, Knoxville, TN; Dugan, Roger [Electric Power Research Institute, Knoxville, TN

2013-01-01T23:59:59.000Z

191

Incremental costs and optimization of in-core fuel management of nuclear power plants  

E-Print Network [OSTI]

This thesis is concerned with development of methods for optimizing the energy production and refuelling decision for nuclear power plants in an electric utility system containing both nuclear and fossil-fuelled stations. ...

Watt, Hing Yan

1973-01-01T23:59:59.000Z

192

On the Power and Limitations of Affine Policies in Two-Stage Adaptive Optimization  

E-Print Network [OSTI]

We consider a two-stage adaptive linear optimization problem under right hand side uncertainty with a minmax objective and give a sharp characterization of the power and limitations of affine policies (where the second ...

Bertsimas, Dimitris J.

193

Aerodynamic optimization of a solar powered race vehicle  

E-Print Network [OSTI]

Aerodynamic optimization was performed on Tesseract, the MIT Solar Electric Vehicle Team's 2003-2005 solar car using Wind Tunnel 8 at Jacobs/Sverdrup Drivability Test Facility in Allen Park, MI. These tests include angle ...

Augenbergs, Peteris K

2006-01-01T23:59:59.000Z

194

Automated Synthesis Tool for Design Optimization of Power Electronic Converters  

E-Print Network [OSTI]

module-integrated photovoltaic inverter is also optimized for efficiency, volume and reliability. An actual converter is constructed using commercial off-the-shelf components. The converter design is chosen as close as possible to a point obtained...

Mirjafari, Mehran

2013-01-09T23:59:59.000Z

195

Simulating calculations and optimization design of a new HVDC supply power for light rail system  

E-Print Network [OSTI]

such a complex system, taking into account vehicle motion and HVDC electrical distribution. Then, an optimizationSimulating calculations and optimization design of a new HVDC supply power for light rail system Rémi Vial, Delphine Riu, Nicolas Retière Grenoble Electrical Engineering Laboratory, 38402 Saint

Boyer, Edmond

196

Asymptotically Optimal Power-Aware Routing for Multihop Wireless Networks with Renewable  

E-Print Network [OSTI]

1 Asymptotically Optimal Power-Aware Routing for Multihop Wireless Networks with Renewable Energy the performance of multihop radio networks in the presence of energy constraints, and design routing algorithms to optimally utilize the available energy. The energy model allows vastly different energy sources

Srikant, Rayadurgam

197

Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization and Integrated Control  

E-Print Network [OSTI]

1 Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization mechanical energy from human foot-strikes and explore its configuration and control towards optimized energy output. Dielectric Elastomers (DEs) are high-energy density, soft, rubber-like material

Potkonjak, Miodrag

198

Power Supply Optimization in Sub-130 nm Leakage Dominant Technologies Man L Mui Kaustav Banerjee Amit Mehrotra  

E-Print Network [OSTI]

Power Supply Optimization in Sub-130 nm Leakage Dominant Technologies Man L Mui Kaustav Banerjee a methodology for systematically optimizing the power supply voltage for maximizing the performance of VLSI cir- cuits in technologies where leakage power is not an insignificant fraction of the total power

199

Optimization Online - The Worst-case Wind Power Scenario for ...  

E-Print Network [OSTI]

Sep 16, 2014 ... The Worst-case Wind Power Scenario for Adaptive Robust Unit Commitment Problems. German Morales-Espaa(gmorales ***at*** kth.se).

German Morales-Espaa

2014-09-16T23:59:59.000Z

200

Optimization Online - Robustified Reserve Modelling for Wind Power ...  

E-Print Network [OSTI]

Jul 8, 2014 ... Robustified Reserve Modelling for Wind Power Integration in Ramp-Based Unit Commitment. German Morales-Espaa(gmorales ***at***...

German Morales-Espaa

2014-07-08T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Optimization Online - Real-Time Dispatchability of Bulk Power ...  

E-Print Network [OSTI]

Mar 16, 2015 ... Real-Time Dispatchability of Bulk Power Systems with Volatile Renewable Generations. Wei Wei (wei-wei04 ***at*** mails.tsinghua.edu.cn)

Wei Wei

2015-03-16T23:59:59.000Z

202

Optimization Online - A Power Penalty Method for Second-order ...  

E-Print Network [OSTI]

Apr 26, 2014 ... A Power Penalty Method for Second-order Cone Nonlinear Complementarity Problems. Zijun Hao(haozijun ***at*** whu.edu.cn) Zhongping...

Zijun Hao

2014-04-26T23:59:59.000Z

203

Optimal Homogenization of Perfusion Flows in Microfluidic Bio-Reactors: A Numerical Study  

E-Print Network [OSTI]

Optimal Homogenization of Perfusion Flows in Microfluidic Bio-Reactors: A Numerical Study Fridolin of Denmark, DTU Nanotech, Kongens Lyngby, Denmark Abstract In recent years, the interest in small-scale bio-reactors microfluidic bio-reactors, we develop a general design of a continually feed bio- reactor with uniform

204

Flow analysis and nozzle-shape optimization for the cold-gas dynamic-spray process  

E-Print Network [OSTI]

Flow analysis and nozzle-shape optimization for the cold-gas dynamic-spray process M Grujicic1*, W, maximizes the acceleration of the particles. Furthermore, it is found that if the cold-spray nozzle, a significant increase in the average velocity of the particles at the nozzle exit can be obtained

Grujicic, Mica

205

Computational Research Challenges and Opportunities for the Optimization of Fossil Energy Power Generation System  

SciTech Connect (OSTI)

Emerging fossil energy power generation systems must operate with unprecedented efficiency and near-zero emissions, while optimizing profitably amid cost fluctuations for raw materials, finished products, and energy. To help address these challenges, the fossil energy industry will have to rely increasingly on the use advanced computational tools for modeling and simulating complex process systems. In this paper, we present the computational research challenges and opportunities for the optimization of fossil energy power generation systems across the plant lifecycle from process synthesis and design to plant operations. We also look beyond the plant gates to discuss research challenges and opportunities for enterprise-wide optimization, including planning, scheduling, and supply chain technologies.

Zitney, S.E.

2007-06-01T23:59:59.000Z

206

North American Power Symposium NAPS, Cleveland, Ohio, October 1998, pp. 294 299. Fundamental Frequency Model of Uni ed Power Flow Controller  

E-Print Network [OSTI]

Frequency Model of Uni ed Power Flow Controller Edvina Uzunovic Claudio A. Ca~nizares John Reeve University and modeling technique used to rep- resent a Uni ed Power Flow Controller UPFC are presented in this paper, Static Synchronous Series Compensator SSSC, and Uni- ed Power Flow Controller UPFC 2 . The STATCOM

Cañizares, Claudio A.

207

HypoEnergy: Hybrid supercapacitor-battery power-supply optimization for Energy efficiency  

E-Print Network [OSTI]

and emerging form of energy storage and delivery. The key benefits of them over the electrochemical batteryHypoEnergy: Hybrid supercapacitor-battery power-supply optimization for Energy efficiency Azalia the hybrid battery-supercapacitor power supply life- time. HypoEnergy combines high energy density

208

Optimal Power Procurement and Demand Response with Quality-of-Usage Guarantees  

E-Print Network [OSTI]

1 Optimal Power Procurement and Demand Response with Quality-of-Usage Guarantees Longbo Huang, Jean the utility company to jointly perform power procurement and demand response so as to maximize the social are the inte- gration of renewable energy technologies [1] and the design of efficient user demand-response

Huang, Longbo

209

Asymptotically Optimal Transmission Policies for Large-Scale Low-Power Wireless Sensor Networks  

E-Print Network [OSTI]

Asymptotically Optimal Transmission Policies for Large-Scale Low-Power Wireless Sensor Networks. The objective is to devise joint routing, power control and transmission scheduling policies in order to gather formulate the problem as maximizing the utility of transmissions subject to explicit fairness constraints

Starobinski, David

210

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

211

Power-Optimal Scheduling for a Green Base Station with Delay Constraints  

E-Print Network [OSTI]

objective of Green Communication is to provide quality of service (QoS) at reduced energy consumptionPower-Optimal Scheduling for a Green Base Station with Delay Constraints Anusha Lalitha, Santanu with average delay constraint on the downlink of a Green Base- station. A Green Base-station is powered by both

Sharma, Vinod

212

A Mathematical Solution to Power Optimal Pipeline Design by Utilizing Soft Edge Flip-Flops  

E-Print Network [OSTI]

A Mathematical Solution to Power Optimal Pipeline Design by Utilizing Soft Edge Flip-Flops Mohammad a novel technique to minimize the total power consumption of a synchronous linear pipeline circuit by exploiting extra slacks available in some stages of the pipeline. The key idea is to utilize soft-edge flip

Pedram, Massoud

213

Temperature-Aware Dynamic Resource Provisioning in a Power-Optimized Datacenter  

E-Print Network [OSTI]

Temperature-Aware Dynamic Resource Provisioning in a Power-Optimized Datacenter Ehsan Pakbaznia and environmental cost trends of datacenters are unsustainable. It is critically important to develop datacenter-wide power and thermal management (PTM) solutions that improve the energy efficiency of the datacenters

Pedram, Massoud

214

Department of Mechanical and Nuclear Engineering Spring 2012 East Campus Power Plant Deaerator Optimization  

E-Print Network [OSTI]

PENNSTATE Department of Mechanical and Nuclear Engineering Spring 2012 East Campus Power Plant Deaerator Optimization Overview In the East Campus Power plant a new Deaerator system has been installed which Deaerator is the most efficient and then make a recommendation to the plant of which one should

Demirel, Melik C.

215

Heuristically Optimized Trade-o s: A New Paradigm for Power Laws in the Internet  

E-Print Network [OSTI]

Heuristically Optimized Trade-o#11;s: A New Paradigm for Power Laws in the Internet Alex Fabrikant 1 , Elias Koutsoupias 2? , and Christos H. Papadimitriou 1?? 1 Computer Science Division University, U.S.A. elias@cs.ucla.edu Abstract. We propose a plausible explanation of the power law distri

Fabrikant, Alex

216

Heuristically Optimized Trade-offs: A New Paradigm for Power Laws in the Internet  

E-Print Network [OSTI]

Heuristically Optimized Trade-offs: A New Paradigm for Power Laws in the Internet Alex Fabrikant1 , Elias Koutsoupias2 , and Christos H. Papadimitriou1 1 Computer Science Division University of California.S.A. elias@cs.ucla.edu Abstract. We propose a plausible explanation of the power law distri- butions

Koutsoupias, Elias

217

Optimization Applications in the Energy and Power Industries November 2009  

E-Print Network [OSTI]

9 Conclusion: Proven Benefits of IBM ILOG Optimization Technologies 12 Introduction: Energy. They have an impressive record of constantly searching for ways to cost- effectively meet the world's energy, especially wind and solar; more investment in energy efficiency by electricity users; development of low

McCalley, James D.

218

A Novel Power Flow Method for Long Term Frequency Stability Analysis  

E-Print Network [OSTI]

This thesis presents a novel approach for a power system to find a practical power flow solution when all the generators in the system have hit their real power output limits, such as some generator units shutting down or load outages. The approach...

Yan, Wenjin

2013-05-06T23:59:59.000Z

219

A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman  

E-Print Network [OSTI]

A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman Indoor Environment Program ABSTRACT This report develops a theoretical description of the hydrodynamic relationship based on a power pipes can be described with a simple power law dependence on pressure, but that the exponent

220

Reactive Power Management using Firefly and Spiral Optimization ...  

E-Print Network [OSTI]

Genetic-Simulated annealing and interior point method [5] ... A comparison between both the algorithms has been ..... results have been simulated using MATLAB Software ... AReview, IEEE International Journal of Power and Energy systems,.

-

2013-09-08T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Designing Optimal Heat and Power Systems for Industrial Processes  

E-Print Network [OSTI]

Industrial heat and power systems are complex and not fully understood as integrated systems. Within the context of the overall manufacturing process, they represent enormous capital investments and substantially contribute to the total operating...

Rutkowski, M. A.; Witherell, W. D.

222

Optimizing hysteretic power loss of magnetic ferrite nanoparticles  

E-Print Network [OSTI]

This thesis seeks to correlate hysteretic power loss of tertiary ferrite nanoparticles in alternating magnetic fields to trends predicted by physical models. By employing integration of hysteresis loops simulated from ...

Chen, Ritchie

2013-01-01T23:59:59.000Z

223

Adaptive primary side control for a wireless power transfer optimization  

E-Print Network [OSTI]

A resonant inductive wireless power transfer system, consisting of a primary (transmitter) circuit and secondary (receiver) circuit, was designed and implemented. This document also contains a novel indirect feedback method ...

Bogoda, Thilani Imanthika Dissanayake

2012-01-01T23:59:59.000Z

224

Kansas City Power and Light- Energy Optimizer Programmable Thermostat Program  

Broader source: Energy.gov [DOE]

Kansas City Power and Light (KCP&L) offers a free Honeywell programmable thermostat, worth $300, and free installation to qualifying customers to manage energy usage. Only residential and small...

225

Power flow analysis for DC voltage droop controlled DC microgrids  

E-Print Network [OSTI]

loss, such as photovoltaic panels, batteries, fuel cells, LEDs, and electronic loads, DC microgrids sharing and secondary voltage regulation can now be analytically studied, and specialized optimization of the DC microgrid, in term of systematic analysis, protection coordination design, network optimization

Chaudhary, Sanjay

226

The Optimal Power Tracking Control Strategy of Grid-Connected Excited Synchronous Wind Power Generator.  

E-Print Network [OSTI]

??In this thesis, the wind power system is a coaxial coupling structure between servo motor and excited synchronous wind power generator. By using the excited (more)

Cheng, Wen-kai

2014-01-01T23:59:59.000Z

227

Flow Shop Scheduling with Peak Power Consumption Constraints  

E-Print Network [OSTI]

To conduct our experiments, we considered a hypothetical flow shop scheduling ... There are two types of machines with different operations: face milling. 16...

2012-09-23T23:59:59.000Z

228

A three phase load flow algorithm for Shipboard Power Systems  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . 3, 5 Network Representation 3. 6 Component Modeling. 3. 7 Integration of Methodology and Component Modeling . . . 3. 8 Chapter Summary. IV Load Flow Algorithm. . 4. 1 Introduction. 4. 2 Load Flow Algorithm. 4. 3 Application of Load Flow... Algorithm. . 4. 4 Summary of Load Flow Algorithm. 4. 5 Chapter Summary. . nl V1 vn 1X 1 3 5 5 8 15 16 16 18 23 26 27 50 53 54 54 54 69 79 79 CHAPTER V RESULTS AND CONCLUSIONS . . 5. 1 Introduction . . 5. 2 IEEE 37 Bus Radial...

Medina-Calder?on, M?onica M

2003-01-01T23:59:59.000Z

229

Performance and power optimization in VLSI physical design  

E-Print Network [OSTI]

. This foresees the wide applicability of TDL technique. However, measured performance based on fabricated circuits is much worse than simulated performance based on the layout. It is suspected that the via resistance variation is the cause. The problem aggravates... courses inVLSI design, which provided me with many techniques for VLSI circuit analysis and optimization. In his course projects, I implemented several algorithms and performed a lot of simulations, which prepared me well to be confident in my job...

Jiang, Zhanyuan

2008-10-10T23:59:59.000Z

230

Dynamic Power Optimization Targeting User Delays in Interactive Systems  

E-Print Network [OSTI]

}@princeton.edu Abstract-- Power has become a major concern for mobile computing systems such as laptops and handhelds, on which a significant fraction of software usage is interactive instead of compute-intensive. For interactive systems, an analysis shows that over 90% of system energy and time is spent waiting for user input

Zhong, Lin

231

Method of optimizing performance of Rankine cycle power plants  

DOE Patents [OSTI]

A method for efficiently operating a Rankine cycle power plant (10) to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine (22) fluid inlet state which is substantially in the area adjacent and including the transposed critical temperature line (46).

Pope, William L. (Walnut Creek, CA); Pines, Howard S. (El Cerrito, CA); Doyle, Padraic A. (Oakland, CA); Silvester, Lenard F. (Richmond, CA)

1982-01-01T23:59:59.000Z

232

Optimal Simultaneous Module and Multivoltage Assignment for Low Power  

E-Print Network [OSTI]

in Proceedings of the 2005 Asia South Pacific Design Automation Conference (Shanghai, China), 850­855. This work of Illinois, Urbana-Champaign JASON CONG University of California, Los Angeles and JUNJUAN XU Synopsys, Inc due to its large potential for power reduction. In this work we study functional unit binding (or

Cong, Jason "Jingsheng"

233

Optimal monitoring and visualization of steady state power system operation  

E-Print Network [OSTI]

observable islands. To guard against unexpected failures of PMUs, the numerical method is extended to account for single PMU loss. In the last part of this dissertation, a 3D graphic user interface for power system analysis is developed. It supports two basic...

Xu, Bei

2009-06-02T23:59:59.000Z

234

Optimal Power Allocation in ChannelCoded Wireless Sudarshan Vasudevan  

E-Print Network [OSTI]

, while considering both transmitter circuit and signal energy. However, for many communication links in significant improvements in overall energy consumption or network lifetime versus schemes that always employ networks with asymmetric power costs. 1 Introduction Wireless ad hoc networks and, in particular, sensor

Massachusetts at Amherst, University of

235

Optimal Power Allocation in Channel-Coded Wireless Sudarshan Vasudevan  

E-Print Network [OSTI]

, while considering both transmitter circuit and signal energy. However, for many communication links in significant improvements in overall energy consumption or network lifetime versus schemes that always employ networks with asymmetric power costs. 1 Introduction Wireless ad hoc networks and, in particular, sensor

Massachusetts at Amherst, University of

236

Optimization Studies for ISOL Type High-Powered Targets  

SciTech Connect (OSTI)

The research studied one-step and two-step Isotope Separation on Line (ISOL) targets for future radioactive beam facilities with high driver-beam power through advanced computer simulations. As a target material uranium carbide in the form of foils was used because of increasing demand for actinide targets in rare-isotope beam facilities and because such material was under development in ISAC at TRIUMF when this project started. Simulations of effusion were performed for one-step and two step targets and the effects of target dimensions and foil matrix were studied. Diffusion simulations were limited by availability of diffusion parameters for UCx material at reduced density; however, the viability of the combined diffusion?effusion simulation methodology was demonstrated and could be used to extract physical parameters such as diffusion coefficients and effusion delay times from experimental isotope release curves. Dissipation of the heat from the isotope-producing targets is the limiting factor for high-power beam operation both for the direct and two-step targets. Detailed target models were used to simulate proton beam interactions with the targets to obtain the fission rates and power deposition distributions, which were then applied in the heat transfer calculations to study the performance of the targets. Results indicate that a direct target, with specification matching ISAC TRIUMF target, could operate in 500-MeV proton beam at beam powers up to ~40 kW, producing ~8 1013 fission/s with maximum temperature in UCx below 2200 C. Targets with larger radius allow higher beam powers and fission rates. For the target radius in the range 9-mm to 30-mm the achievable fission rate increases almost linearly with target radius, however, the effusion delay time also increases linearly with target radius.

Remec, Igor [Oak Ridge National Laboratory] [Oak Ridge National Laboratory; Ronningen, Reginald Martin [Michigan State University] [Michigan State University

2013-09-24T23:59:59.000Z

237

A Hierarchical Demand Response Framework for Data Center Power Cost Optimization Under Real-World Electricity Pricing  

E-Print Network [OSTI]

1 A Hierarchical Demand Response Framework for Data Center Power Cost Optimization Under Real for optimizing their utility bills. Our focus is on a subset of this work that carries out demand response (DR

Urgaonkar, Bhuvan

238

Distributed series reactance: a new approach to realize grid power flow control.  

E-Print Network [OSTI]

??The objective of the proposed research is to develop a cost-effective power flow controller to improve the utilization and reliability of the existing transmission, sub-transmission, (more)

Johal, Harjeet

2008-01-01T23:59:59.000Z

239

Analysis of operating data related to power and flow distribution in a PWR  

E-Print Network [OSTI]

The analysis of the effects of the uncertainties associated with temperature and power measurements in the Connecticut Yankee Reactor leads to the evaluation of the uncertainty associated with the effective flow factor. ...

Herbin, Henry Christophe

1974-01-01T23:59:59.000Z

240

Free Flow Power Partners to Improve Hydrokinetic Turbine Performance...  

Office of Environmental Management (EM)

as the device performed as expected, with no discernible harm to river-dwelling fish. Free Flow has also completed preliminary designs of utility-scale installations at a...

Note: This page contains sample records for the topic "optimal power flow" 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

An Equivalent Network for Load-Flow Analysis of Power Systems  

E-Print Network [OSTI]

AN EQUIVALENT NETWORK FOR LOAD-FLOW ANALYSIS OF POWER SYSTEMS A Thesis by Meri on L. Johnson Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partihl fulfillment of the requirements for the degree... of MASTER OF SCIENCE May, 1960 Major Subject: Electrical Engineering AN EQUIVALENT NETWORK FOR LOAD-FLOW ANALYSIS OF POWER SYSTEMS A Thesis By Merion L. Johnson Approv as to style a d content by (Chairman of Co ittee ) (Head of Department...

Johnson, Merion Luke

1960-01-01T23:59:59.000Z

242

Abstract--A bi-objective optimization model of power and power changes generated by a wind turbine is discussed in this  

E-Print Network [OSTI]

operating a variable-speed wind turbine with pitch control to maximize power while minimizing the loads prediction, power ramp rate, data mining, wind turbine operation strategy, generator torque, blade pitch1 Abstract--A bi-objective optimization model of power and power changes generated by a wind

Kusiak, Andrew

243

Determining Optimal Equipment Capacities in Cooling, Heating and Power (CHP) Systems  

SciTech Connect (OSTI)

Evaluation of potential cooling, heating and power (CHP) applications requires an assessment of the operations and economics of a particular system in meeting the electric and thermal demands of a specific end-use facility. A key determinate in whether a candidate system will be economic is the proper selection of equipment capacities. A methodology to determine the optimal capacities for CHP prime movers and absorption chillers using nonlinear optimization algorithms has been coded into a Microsoft Excel spreadsheet tool that performs the capacity optimization and operations simulation. This paper presents details on the use and results of this publicly available tool.

DeVault, Robert C [ORNL; Hudson II, Carl Randy [ORNL

2006-01-01T23:59:59.000Z

244

Optimization of a Two-Fluid Hydrodynamic Model of Churn-Turbulent Flow  

SciTech Connect (OSTI)

A hydrodynamic model of two-phase, churn-turbulent flows is being developed using the computational multiphase fluid dynamics (CMFD) code, NPHASE-CMFD. The numerical solutions obtained by this model are compared with experimental data obtained at the TOPFLOW facility of the Institute of Safety Research at the Forschungszentrum Dresden-Rossendorf. The TOPFLOW data is a high quality experimental database of upward, co-current air-water flows in a vertical pipe suitable for validation of computational fluid dynamics (CFD) codes. A five-field CMFD model was developed for the continuous liquid phase and four bubble size groups using mechanistic closure models for the ensemble-averaged Navier-Stokes equations. Mechanistic models for the drag and non-drag interfacial forces are implemented to include the governing physics to describe the hydrodynamic forces controlling the gas distribution. The closure models provide the functional form of the interfacial forces, with user defined coefficients to adjust the force magnitude. An optimization strategy was devised for these coefficients using commercial design optimization software. This paper demonstrates an approach to optimizing CMFD model parameters using a design optimization approach. Computed radial void fraction profiles predicted by the NPHASE-CMFD code are compared to experimental data for four bubble size groups.

Donna Post Guillen

2009-07-01T23:59:59.000Z

245

Application of Flow Battery in Marine Current Turbine System for Daily Power Management  

E-Print Network [OSTI]

focuses on a grid-connected MCT system and proposes using vanadium redox flow battery (VRB) energy storage/energy sizing. In this paper, one grid-connected MCT generation system with battery energy storage system (BESSApplication of Flow Battery in Marine Current Turbine System for Daily Power Management Zhibin Zhou

Brest, Université de

246

Simulation and optimization of cogeneration power plant operation using an Energy Optimization Program  

E-Print Network [OSTI]

The operation of a combined cycle cogeneration power plant system is complicated because of the complex interactions among components as well as the dynamic nature of the system. Studies of plant operation through experiments in such a sensitive...

Zhou, Jijun

2001-01-01T23:59:59.000Z

247

Interline Photovoltaic (I-PV) power system - A novel concept of power flow control and management  

E-Print Network [OSTI]

This paper presents a new system configuration for a large-scale Photovoltaic (PV) power system with multi-line transmission/distribution networks. A PV power plant is reconfigured in a way that two adjacent power system ...

Khadkikar, Vinod

248

Optimization Online - Information Gap Decision Theory Based OPF ...  

E-Print Network [OSTI]

Jan 3, 2015 ... Abstract: A method for solving the optimal power flow (OPF) problem including HVDC connected offshore wind farms is presented in this paper.

rabiee abbas

2015-01-03T23:59:59.000Z

249

Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units with  

E-Print Network [OSTI]

of virtual impedance parameters and (ii) higher accuracy in reactive power flow calculation. The improved With larger portion of growing electricity demand which is being fed through distributed generation (DG, in order to decouple real and reactive power, to increase the stability margin and also to improve

Chaudhary, Sanjay

250

Similarity flow solutions of a non-Newtonian power-law fluid Mohamed Guedda, Zakia Hammouch  

E-Print Network [OSTI]

for a steady-state laminar bound- ary layer flow, governed by the Ostwald-de Wael power-law model-Newtonian fluid mechanics is the Ostwald-de Wael model (with a power-law rheology [2, 3, 4, 5, 6]), which

Paris-Sud XI, Université de

251

Optimal fracture treatment design for dry gas wells maximizes well performance in the presence of non-Darcy flow effects  

E-Print Network [OSTI]

This thesis presents a methodology based on Proppant Number approach for optimal fracture treatment design of natural gas wells considering non-Darcy flow effects in the design process. Closure stress is taken into account, by default, because...

Lopez Hernandez, Henry De Jesus

2004-11-15T23:59:59.000Z

252

Energy 42 (2012) 486-496 Thermoeconomic operation optimization of a coal-fired power plant  

E-Print Network [OSTI]

- -,- -------:-:-:-:-:-:-:~:-:-:-:-:---.-- Energy 42 (2012) 486-496 Thermoeconomic operation optimization of a coal-fired power plant Jie Xiong a, Haibo Zhao a.*, Chao Zhang a, Chuguang Zheng a, Peter B. Luh b aState Key Laboratory of Coal Combustion. Huazhong University ofSdence and Technology. Wuhan

Luh, Peter

2012-01-01T23:59:59.000Z

253

HIGH-LEVEL MULTI-STEP INVERTER OPTIMIZATION, USING A MINIMUM NUMBER OF POWER TRANSISTORS.  

E-Print Network [OSTI]

HIGH-LEVEL MULTI-STEP INVERTER OPTIMIZATION, USING A MINIMUM NUMBER OF POWER TRANSISTORS. Juan 56-41-246-999 e-mail lmoran@renoir.die.udec.cl ABSTRACT Multilevel inverters with a large number-5]. Multi-level inverters can operate not only with PWM techniques but also with amplitude modulation (AM

Catholic University of Chile (Universidad Católica de Chile)

254

Journal of Power Sources 134 (2004) 130138 Performance optimization of a batterycapacitor hybrid system  

E-Print Network [OSTI]

-ion battery with commercial super capacitors using impedance measurement were car- ried out by Chu and BraatzJournal of Power Sources 134 (2004) 130­138 Performance optimization of a battery­capacitor hybrid, the pulse frequency and design parameters (the capacitor configuration index) on the performance

Popov, Branko N.

255

An Optimal Fuzzy Logic Power Sharing Strategy for Parallel Hybrid Electric Vehicles  

E-Print Network [OSTI]

An Optimal Fuzzy Logic Power Sharing Strategy for Parallel Hybrid Electric Vehicles F. Khoucha1 presents a fuzzy logic controller for a Parallel Hybrid Electric Vehicle (PHEV). The PHEV required driving economy, and emissions. Index Terms--Parallel Hybrid Electric Vehicle (PHEV), Internal Combustion Engine

Brest, Université de

256

A STOCHASTIC OPTIMAL CONTROL APPROACH FOR POWER MANAGEMENT IN PLUG-IN HYBRID ELECTRIC VEHICLES  

E-Print Network [OSTI]

A STOCHASTIC OPTIMAL CONTROL APPROACH FOR POWER MANAGEMENT IN PLUG-IN HYBRID ELECTRIC VEHICLES.e., the engine and electric machines) in a plug-in hybrid electric vehicle (PHEV). Existing studies focus mostly. INTRODUCTION This paper examines plug-in hybrid electric vehicles (PHEVs), i.e., automobiles that can extract

Krstic, Miroslav

257

Optimal Power Management in Wireless Control Systems Konstantinos Gatsis, Alejandro Ribeiro and George J. Pappas  

E-Print Network [OSTI]

but a separation principle for finite horizon costs can be established [11], and optimal plant and transmission the sensor. The power allocated to these transmissions determines the probability of successful reception of transmissions protected with capacity achieving codes, conventional event-triggered policies are recovered

Pappas, George J.

258

Online Capable Optimized Planning of Power Split in a Hybrid Energy Storage System  

E-Print Network [OSTI]

Online Capable Optimized Planning of Power Split in a Hybrid Energy Storage System Karl Stephan, D-33095 Paderborn (Germany) {stille,romaus,boecker}@lea.upb.de Abstract--A hybrid energy storage system is an energy storage consisting of more than one type of energy storages combining

Paderborn, Universität

259

Optimization and Visualization of the North American Eastern Interconnect Power Market  

E-Print Network [OSTI]

Optimization and Visualization of the North American Eastern Interconnect Power Market Douglas R uses a first generation OPF model of the Eastern Interconnect to gauge the potential benefits deriving, there is sufficient low cost capacity to keep peak demand prices in the Eastern Interconnect below $50 MWH. Under

260

Optimizing Datacenter Power with Memory System Levers for Guaranteed Quality-of-Service  

E-Print Network [OSTI]

Optimizing Datacenter Power with Memory System Levers for Guaranteed Quality-of-Service Kshitij scenario in datacenters. Co- location, while maintaining Quality-of-Service (QoS) for each application is a complex problem that is fast gaining rele- vance for these datacenters. The problem is exacerbated

Balasubramonian, Rajeev

Note: This page contains sample records for the topic "optimal power flow" 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

Utility-based Time and Power Allocation on an Energy Harvesting Downlink: The Optimal  

E-Print Network [OSTI]

problem where the transmitter is aware of the energy arrival statistics of a frame before the frame starts harvest energy through solar cells, vibration absorption devices, thermoelectric generators, wind power on optimizing data transmission with an energy harvesting transmitter. A single-user communication system op

Uysal-Biyikoglu, Elif

262

Heuristically Optimized Trade-o s: A New Paradigm for Power Laws in the Internet  

E-Print Network [OSTI]

. of Athens and UCLA elias@cs.ucla.edu Christos H. Papadimitriou U.C. Berkeley christosHeuristically Optimized Trade-o#11;s: A New Paradigm for Power Laws in the Internet (Extended Abstract for STOC 02) Alex Fabrikant U.C. Berkeley alexf@csua.berkeley.edu Elias Koutsoupias Univ

Bartal, Yair

263

Compatibility Study of Compile-Time Optimizations for Power and Reliability  

E-Print Network [OSTI]

, Christos Strydis and Georgi Gaydadjiev Computer Engineering Laboratory, Electrical Engineering Dept. Delft.N.Gaydadjiev} @ tudelft.nl Abstract--Historically compiler optimizations have been used mainly for improving embedded devices, power consumption becomes a crucial problem that is addressed by modern compilers. Biomedical

Kuzmanov, Georgi

264

High Average Power Laser Gain Medium With Low Optical Distortion Using A Transverse Flowing Liquid Host  

DOE Patents [OSTI]

A high average power, low optical distortion laser gain media is based on a flowing liquid media. A diode laser pumping device with tailored irradiance excites the laser active atom, ion or molecule within the liquid media. A laser active component of the liquid media exhibits energy storage times longer than or comparable to the thermal optical response time of the liquid. A circulation system that provides a closed loop for mixing and circulating the lasing liquid into and out of the optical cavity includes a pump, a diffuser, and a heat exchanger. A liquid flow gain cell includes flow straighteners and flow channel compression.

Comaskey, Brian J. (Walnut Creek, CA); Ault, Earl R. (Livermore, CA); Kuklo, Thomas C. (Oakdale, CA)

2005-07-05T23:59:59.000Z

265

Stochastic Modeling of a Power-Managed System: Construction and Optimization Qinru Qiu, Qing Wu and Massoud Pedram  

E-Print Network [OSTI]

1 Stochastic Modeling of a Power-Managed System: Construction and Optimization Qinru Qiu, Qing Wu of a power-managed electronic system. We formulate the problem of system-level power management-digital components. Dynamic power management ­ which refers to selective shut-off or slow-down of system components

Qiu, Qinru

266

Sum-Rate Optimal Power Policies for Energy Harvesting Transmitters in an Interference Channel  

E-Print Network [OSTI]

This paper considers a two-user Gaussian interference channel with energy harvesting transmitters. Different than conventional battery powered wireless nodes, energy harvesting transmitters have to adapt transmission to availability of energy at a particular instant. In this setting, the optimal power allocation problem to maximize sum throughput within a given deadline is formulated. The convergence of the proposed iterative coordinate descent method for the problem is proved and the short-term throughput maximizing offline power allocation policy is found. Examples for interference regions with known sum capacities are given with directional water-filling interpretations when possible. Next, stochastic data arrivals are addressed. Finally online and/or distributed near-optimal policies are proposed. Performance of the proposed algorithms are demonstrated through simulations.

Tutuncuoglu, Kaya

2011-01-01T23:59:59.000Z

267

Optimal Design of a PV/Fuel Cell Hybrid Power System for the City of Brest in France  

E-Print Network [OSTI]

source. The produced hydrogen feeds then a fuel cell (FC) system, which will supply the city of BrestOptimal Design of a PV/Fuel Cell Hybrid Power System for the City of Brest in France Omar Hazem with the optimal design of a stand-alone hybrid photovoltaic and fuel cell power system without battery storage

Brest, Université de

268

Optimal homogenization of perfusion flows in microfluidic bio-reactors; a numerical study  

E-Print Network [OSTI]

To ensure homogeneous conditions within the complete area of perfused microfluidic bio-reactors, we develop a general design of a continuously feed bio-reactor with uniform perfusion flow. This is achieved by introducing a specific type of perfusion inlet to the reaction area. The geometry of these inlets are found using the methods of topology optimization and shape optimization. The results are compared with two different analytic models, from which a general parametric description of the design is obtained and tested numerically. Such a parametric description will generally be beneficial for the design of a broad range of microfluidic bioreactors used for e.g. cell culturing and analysis, and in feeding bio-arrays.

Okkels, Fridolin; Bruus, Henrik

2009-01-01T23:59:59.000Z

269

Interconnection networks synthesis and optimization  

E-Print Network [OSTI]

Synthesis and Optimization . . . . . . . . . . .1.Wire Style Optimization . . . . . . . . . . . . . B. PowerSynthesis and Optimization . 1. Overview . . . . . . . . . .

Zhu, Yi

2008-01-01T23:59:59.000Z

270

Optimizing a Hybrid Energy Storage System for a Virtual Power Plant for Improved Wind Power  

E-Print Network [OSTI]

. Possibilities to overcome this problem are to increase transmission capacities, demand side management approach to find two optimum energy storages (ESs) to build a hybrid system which is part of a virtual and the EU renewable directive [1] is even demanding for even higher rates of renewable power generation

Teodorescu, Remus

271

Optimal Power Allocation in Wireless Networks with Transmitter-Receiver Power Tradeoffs  

E-Print Network [OSTI]

are more pronounced in networks with asymmetric power costs. 1 Introduction Wireless ad hoc networks have. Habitat monitoring [13], environmental observation and forecasting [1], organ monitoring and health mon has some on board memory for data storage. The deployed nodes not only originate data but can also act

Massachusetts at Amherst, University of

272

Parallel computation of Gauss-Seidel type algorithms for power flow analysis  

E-Print Network [OSTI]

, ' , are available. Stimulated by such availability, application oriented research has been initiated and has become fruitful in many areas. We will attempt to investigate some of the application issues in the area of power flow analysis. A power flow program... Line No. Bus No. Trans. No. Cap. No. Avg. Connection IEEE 14 IEEE 30 IEEE 57 IEEE 118 SCA SCB SCC SCD SCE SCF Texas 17 65 177 176 151 166 137 218 2834 14 30 57 118 133 150 128 131 105 168 2429 50 22 70 405 14 323 3...

Ongsakul, Weerakorn

1991-01-01T23:59:59.000Z

273

Nonlinear power flow control applications to conventional generator swing equations subject to variable generation.  

SciTech Connect (OSTI)

In this paper, the swing equations for renewable generators are formulated as a natural Hamiltonian system with externally applied non-conservative forces. A two-step process referred to as Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) is used to analyze and design feedback controllers for the renewable generator system. This formulation extends previous results on the analytical verification of the Potential Energy Boundary Surface (PEBS) method to nonlinear control analysis and design and justifies the decomposition of the system into conservative and non-conservative systems to enable a two-step, serial analysis and design procedure. In particular, this approach extends the work done by developing a formulation which applies to a larger set of Hamiltonian Systems that has Nearly Hamiltonian Systems as a subset. The results of this research include the determination of the required performance of a proposed Flexible AC Transmission System (FACTS)/storage device to enable the maximum power output of a wind turbine while meeting the power system constraints on frequency and phase. The FACTS/storage device is required to operate as both a generator and load (energy storage) on the power system in this design. The Second Law of Thermodynamics is applied to the power flow equations to determine the stability boundaries (limit cycles) of the renewable generator system and enable design of feedback controllers that meet stability requirements while maximizing the power generation and flow to the load. Necessary and sufficient conditions for stability of renewable generators systems are determined based on the concepts of Hamiltonian systems, power flow, exergy (the maximum work that can be extracted from an energy flow) rate, and entropy rate.

Robinett, Rush D., III; Wilson, David Gerald

2010-05-01T23:59:59.000Z

274

Optimal Sizing of Energy Storage and Photovoltaic Power Systems for Demand Charge Mitigation (Poster)  

SciTech Connect (OSTI)

Commercial facility utility bills are often a strong function of demand charges -- a fee proportional to peak power demand rather than total energy consumed. In some instances, demand charges can constitute more than 50% of a commercial customer's monthly electricity cost. While installation of behind-the-meter solar power generation decreases energy costs, its variability makes it likely to leave the peak load -- and thereby demand charges -- unaffected. This then makes demand charges an even larger fraction of remaining electricity costs. Adding controllable behind-the-meter energy storage can more predictably affect building peak demand, thus reducing electricity costs. Due to the high cost of energy storage technology, the size and operation of an energy storage system providing demand charge management (DCM) service must be optimized to yield a positive return on investment (ROI). The peak demand reduction achievable with an energy storage system depends heavily on a facility's load profile, so the optimal configuration will be specific to both the customer and the amount of installed solar power capacity. We explore the sensitivity of DCM value to the power and energy levels of installed solar power and energy storage systems. An optimal peak load reduction control algorithm for energy storage systems will be introduced and applied to historic solar power data and meter load data from multiple facilities for a broad range of energy storage system configurations. For each scenario, the peak load reduction and electricity cost savings will be computed. From this, we will identify a favorable energy storage system configuration that maximizes ROI.

Neubauer, J.; Simpson, M.

2013-10-01T23:59:59.000Z

275

Optimal Power Procurement and Demand Response with Quality-of-Usage Guarantees  

E-Print Network [OSTI]

In this paper, we propose a general operating scheme which allows the utility company to jointly perform power procurement and demand response so as to maximize the social welfare. Our model takes into consideration the effect of the renewable energy and the multi-stage feature of the power procurement process. It also enables the utility company to provide quality-of-usage (QoU) guarantee to the power consumers, which ensures that the average power usage level meets the target value for each user. To maximize the social welfare, we develop a low-complexity algorithm called the \\emph{welfare maximization algorithm} (WMA), which performs joint power procurement and dynamic pricing. WMA is constructed based on a two-timescale Lyapunov optimization technique. We prove that WMA achieves a close-to-optimal utility and ensures that the QoU requirement is met with bounded deficit. WMA can be implemented in a distributed manner and is robust with respect to system dynamics uncertainty.

Huang, Longbo; Ramchandran, Kannan

2011-01-01T23:59:59.000Z

276

Thermoeconomic design optimization of a KRW-based IGCC power plant  

SciTech Connect (OSTI)

This report discussed the cost and efficiency optimization of an integrated gasification-combined-cycle (IGCC) power plant design and the effects of important design options and parameters. Advanced thermoeconomic techniques were used to evaluate and optimize a given IGCC concept which uses Illinois No. 6 bituminous coal, air-blown KRW coal gasifiers, a hot gas cleanup system, and GE MS7001F gas turbines. Three optimal design concepts are presented and discussed in the report. Two of the concepts are characterized by minimum cost of electricity at two different values of the steam high pressure. The third concept represents the thermodynamic optimum. This study identified several differences between the original design and the design of the optimized cases. Compared with the original concept, significant annual savings are achieved in the cost optimal cases. Comparisons were made between results obtained using both the old and the new performance data for the MS7001F gas turbine. This report discusses the effects of gasification temperature, steam high pressure, coal moisture, and various design options on the overall plant efficiency and cost of electricity. Cost sensitivity studies were conducted and recommendations for future studies were made.

Tsatsaronis, G.; Lin, L.; Pisa, J.; Tawfik, T. (Tennessee Technological Univ., Cookeville, TN (United States). Center for Electric Power)

1991-11-01T23:59:59.000Z

277

Thermoeconomic design optimization of a KRW-based IGCC power plant. Final report  

SciTech Connect (OSTI)

This report discussed the cost and efficiency optimization of an integrated gasification-combined-cycle (IGCC) power plant design and the effects of important design options and parameters. Advanced thermoeconomic techniques were used to evaluate and optimize a given IGCC concept which uses Illinois No. 6 bituminous coal, air-blown KRW coal gasifiers, a hot gas cleanup system, and GE MS7001F gas turbines. Three optimal design concepts are presented and discussed in the report. Two of the concepts are characterized by minimum cost of electricity at two different values of the steam high pressure. The third concept represents the thermodynamic optimum. This study identified several differences between the original design and the design of the optimized cases. Compared with the original concept, significant annual savings are achieved in the cost optimal cases. Comparisons were made between results obtained using both the old and the new performance data for the MS7001F gas turbine. This report discusses the effects of gasification temperature, steam high pressure, coal moisture, and various design options on the overall plant efficiency and cost of electricity. Cost sensitivity studies were conducted and recommendations for future studies were made.

Tsatsaronis, G.; Lin, L.; Pisa, J.; Tawfik, T. [Tennessee Technological Univ., Cookeville, TN (United States). Center for Electric Power

1991-11-01T23:59:59.000Z

278

Evaluation and Optimization of a Supercritical Carbon Dioxide Power Conversion Cycle for Nuclear Applications  

SciTech Connect (OSTI)

There have been a number of studies involving the use of gases operating in the supercritical mode for power production and process heat applications. Supercritical carbon dioxide (CO2) is particularly attractive because it is capable of achieving relatively high power conversion cycle efficiencies in the temperature range between 550C and 750C. Therefore, it has the potential for use with any type of high-temperature nuclear reactor concept, assuming reactor core outlet temperatures of at least 550C. The particular power cycle investigated in this paper is a supercritical CO2 Recompression Brayton Cycle. The CO2 Recompression Brayton Cycle can be used as either a direct or indirect power conversion cycle, depending on the reactor type and reactor outlet temperature. The advantage of this cycle when compared to the helium Brayton Cycle is the lower required operating temperature; 550C versus 850C. However, the supercritical CO2 Recompression Brayton Cycle requires an operating pressure in the range of 20 MPa, which is considerably higher than the required helium Brayton cycle operating pressure of 8 MPa. This paper presents results of analyses performed using the UniSim process analyses software to evaluate the performance of the supercritical CO2 Brayton Recompression Cycle for different reactor outlet temperatures. The UniSim model assumed a 600 MWt reactor power source, which provides heat to the power cycle at a maximum temperature of between 550C and 750C. The UniSim model used realistic component parameters and operating conditions to model the complete power conversion system. CO2 properties were evaluated, and the operating range for the cycle was adjusted to take advantage of the rapidly changing conditions near the critical point. The UniSim model was then optimized to maximize the power cycle thermal efficiency at the different maximum power cycle operating temperatures. The results of the analyses showed that power cycle thermal efficiencies in the range of 40 to 50% can be achieved.

Edwin A. Harvego; Michael G. McKellar

2011-05-01T23:59:59.000Z

279

A New Model of Centrality Measure based on Bidirectional Power Flow for  

E-Print Network [OSTI]

power flow based model to evaluate the criticality in smart grid environment. Change in direction of smart grid includes various generation options, primarily in the distribution side ­ near consumers. Engagement of customers with the energy management systems is the most lucrative part of smart grid from

Pota, Himanshu Roy

280

Two-phase power-law modeling of pipe flows displaying shear-thinning phenomena  

SciTech Connect (OSTI)

This paper describes work in modeling concentrated liquid-solids flows in pipes. COMMIX-M, a three-dimensional transient and steady-state computer program developed at Argonne National Laboratory, was used to compute velocities and concentrations. Based on the authors` previous analyses, some concentrated liquid-solids suspension flows display shear-thinning rather than Newtonian phenomena. Therefore, they developed a two-phase non-Newtonian power-law model that includes the effect of solids concentration on solids viscosity. With this new two-phase power-law solids-viscosity model, and with constitutive relationships for interfacial drag, virtual mass effect, shear lift force, and solids partial-slip boundary condition at the pipe walls, COMMIX-M is capable of analyzing concentrated three-dimensional liquid-solids flows.

Ding, Jianmin; Lyczkowski, R.W.; Sha, W.T.

1993-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

A Hierarchical Demand Response Framework for Data Center Power Cost Optimization Under Real-World Electricity Pricing  

E-Print Network [OSTI]

1 A Hierarchical Demand Response Framework for Data Center Power Cost Optimization Under Real bills. Our focus is on a subset of this work that carries out demand response (DR) by modulating

Urgaonkar, Bhuvan

282

Primus Power's Flow Battery Powered by $11 Million in Private Investment  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy UsageAUDITVehicles »ExchangeDepartment of EnergyPowering Curiosity: Lab Tech|

283

Optimization of waste heat recovery boiler of a combined cycle power plant  

SciTech Connect (OSTI)

This paper describes the details of a procedure developed for optimization of a waste heat recovery boiler (WHRB) of a combined cycle power plant (CCPP) using the program for performance prediction of a typical CCPP, details of which have been presented elsewhere (Seyedan et al., 1994). In order to illustrate the procedure, the optimum design of a WHRB for a typical CCPP (employing dual-pressure bottoming cycle) built by a prominent Indian company, has been carried out. The present design of a WHRB is taken as the base design and the newer designs generated by this procedure are compared with it to assess the extent of cost reduction possible.

Seyedan, B.; Dhar, P.L.; Gaur, R.R. [Indian Inst. of Tech., New Delhi (India). Dept. of Mechanical Engineering; Bindra, G.S. [Bharat Heavy Electrical Ltd., New Delhi (India)

1996-07-01T23:59:59.000Z

284

IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED CHARGE MOTION AND SLURRY FLOW IN PLANT SCALE SAG MILLS  

SciTech Connect (OSTI)

The U.S. mining industry operates approximately 80 semi-autogenesis grinding mills (SAG) throughout the United States. Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding is 50 percent of the cost of production of the metal. A research team from the University of Utah is working to make inroads into saving energy in these SAG mills. In 2003, Industries of the Future Program of the Department of Energy tasked the University of Utah team to build a partnership between the University and the mining industry for the specific purpose of reducing energy consumption in SAG mills. A partnership was formed with Cortez Gold Mines, Kennecott Utah Copper Corporation, Process Engineering Resources Inc. and others. In the current project, Cortez Gold Mines played a key role in facilitating the 26-ft SAG mill at Cortez as a test mill for this study. According to plant personnel, there were a number of unscheduled shut downs to repair broken liners and the mill throughput fluctuated depending on ore type. The University team had two softwares, Millsoft and FlowMod to tackle the problem. Millsoft is capable of simulating the motion of charge in the mill. FlowMod calculates the slurry flow through the grate and pulp lifters. Based on this data the two models were fine-tuned to fit the Cortez SAG will. In the summer of 2004 a new design of shell lifters were presented to Cortez and in September 2004 these lifters were installed in the SAG mill. By December 2004 Cortez Mines realized that the SAG mill is drawing approximately 236-kW less power than before while maintaining the same level of production. In the first month there was extreme cycling and operators had to learn more. Now the power consumption is 0.3-1.3 kWh/ton lower than before. The actual SAG mill power draw is 230-370 kW lower. Mill runs 1 rpm lesser in speed on the average. The re-circulation to the cone crusher is reduced by 1-10%, which means more efficient grinding of critical size material is taking place in the mill. All of the savings have resulted in reduction of operating cost be about $0.023-$0.048/ ton.

Raj K. Rajamani; Sanjeeva Latchireddi; Sravan K. Prathy; Trilokyanath Patra

2005-12-01T23:59:59.000Z

285

Analysis of oscillation characteristics and optimal conditions for high power operation of Gyrotron FU CW GIII  

SciTech Connect (OSTI)

The oscillation characteristics of Gyrotron FU CW GIII and its wave frequency and output power dependences on the magnetic field strength, the gun coil current, and the anode voltage were investigated experimentally. The experimental results were analyzed theoretically using a self-consistent code that included the electron properties in the cavity, corresponding to the actual operating conditions in the experiments. As a result, it was found that the variation in frequency with the magnetic field strength was related to an axial profile change in the electromagnetic wave in the cavity. In addition, the optimal condition that gives the maximum output power was found to be determined by the pitch factor rather than by the electron beam radius under the given operating conditions.

Tatematsu, Y., E-mail: tatema@fir.u-fukui.ac.jp; Yamaguchi, Y.; Kawase, T.; Ichioka, R.; Ogawa, I.; Saito, T.; Idehara, T. [Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507 (Japan)

2014-08-15T23:59:59.000Z

286

Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission  

E-Print Network [OSTI]

1 Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission systems to endow them with the capability of being reconfigured to a secure planning, reactive power control, reconfiguration, voltage stability. I. INTRODUCTION PPROPRIATE long

Kumar, Ratnesh

287

Design optimization methodology for power converters based on global energy requirement criteria. Application to a DC-DC flyback structure  

E-Print Network [OSTI]

for power electronic converters according to the Global Energy Requirement (GER) criterion, i.e. the primary-design converters in order to take its environmental impacts (here, only its global primary energy consumptionDesign optimization methodology for power converters based on global energy requirement criteria

Paris-Sud XI, Université de

288

is growing need analyze and optimize standby component power digital circuits designed portable batterypowered applications. Since these circuits remain  

E-Print Network [OSTI]

Abstract There is growing need analyze and optimize stand­by component power digital circuits dynamic computational workloads. Analytical models leakage current, dynamic power, frequency a function supply voltage body derived and verified with SPICE simulation. Given these models, show how derive

Mudge, Trevor

289

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 22, NO. 3, MAY 2007 815 Design of Resonant Inverters for Optimal Efficiency  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 22, NO. 3, MAY 2007 815 Design of Resonant Inverters for Optimal Efficiency Over Lamp Life in Electronic Ballast With Phase Control Francisco J. Azcondo, Senior was presented in part at The 20th Annual IEEE Applied Power Electronics Conference and Exposition (APEC'05

290

Distributed control of reactive power flow in a radial distribution circuit with high photovoltaic penetration  

SciTech Connect (OSTI)

We show how distributed control of reactive power can serve to regulate voltage and minimize resistive losses in a distribution circuit that includes a significant level of photovoltaic (PV) generation. To demonstrate the technique, we consider a radial distribution circuit with a single branch consisting of sequentially-arranged residential-scale loads that consume both real and reactive power. In parallel, some loads also have PV generation capability. We postulate that the inverters associated with each PV system are also capable of limited reactive power generation or consumption, and we seek to find the optimal dispatch of each inverter's reactive power to both maintain the voltage within an acceptable range and minimize the resistive losses over the entire circuit. We assume the complex impedance of the distribution circuit links and the instantaneous load and PV generation at each load are known. We compare the results of the optimal dispatch with a suboptimal local scheme that does not require any communication. On our model distribution circuit, we illustrate the feasibility of high levels of PV penetration and a significant (20% or higher) reduction in losses.

Chertkov, Michael [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory; Backhaus, Scott [Los Alamos National Laboratory; Sule, Petr [NEW MEXICO CONSORTIUM

2009-01-01T23:59:59.000Z

291

Engineering Predictions in Industrial and Power Flows Using the Retrograde Condensation Curve. Part I-Methodology  

E-Print Network [OSTI]

Industrial and power systems rely on engineering predictions of the flow properties of working fluids. The paper proposes a way of the utilization of the vapor quality values along the new retrograde condensation curve in the generation of the void fraction design guidelines and reliable prediction of the saturated liquid specific volumes/densities. The new procedure eliminates the involvement of semi-empirical relationships like rectilinear diameter and other similar models.

Labinov, Mark S

2014-01-01T23:59:59.000Z

292

Optimization of electrode characteristics for the Br2/H2 redox flow cell  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

The Br2/H2 redox flow cell shows promise as a high-power, low-cost energy storage device. The effect of various aspects of material selection, processing, and assembly of electrodes on the operation, performance, and efficiency of the system is determined. In particular, (+) electrode thickness, cell compression, hydrogen pressure, and (?) electrode architecture are investigated. Increasing hydrogen pressure and depositing the (?) catalyst layer on the membrane instead of on the carbon paper backing layers have a large positive impact on performance, enabling a limiting current density above 2 A cm?2 and a peak power density of 1.4 W cm?2. Maximum energy efficiency of 79 % is achieved. In addition, the root cause of limiting-current behavior in this system is elucidated, where it is found that Br? reversibly adsorbs at the Pt (?) electrode for potentials exceeding a critical value, and the extent of Br? coverage is potential-dependent. This phenomenon limits maximum cell current density and must be addressed in system modeling and design. These findings are expected to lower system cost and enable higher efficiency.

Tucker, Michael C.; Cho, Kyu Taek; Weber, Adam Z.; Lin, Guangyu; Nguyen, Trung V.

2014-10-01T23:59:59.000Z

293

Similarity Flow Solutions of a Non-Newtonian Power-law Fluid  

E-Print Network [OSTI]

In this paper we present a mathematical analysis for a steady-state laminar boundary layer flow, governed by the Ostwald-de Wael power-law model of an incompressible non- Newtonian fluid past a semi-infinite power-law stretched flat plate with uniform free stream velocity. A generalization of the usual Blasius similarity transformation is used to find similarity solutions [1]. Under appropriate assumptions, partial differential equations are transformed into an autonomous third-order nonlinear degenerate ordinary differential equation with boundary conditions. Using a shooting method, we establish the existence of an infinite number of global unbounded solutions. The asymptotic behavior is also discussed. Some properties of those solutions depend on the viscosity power-law index.

Guedda, Mohamed

2009-01-01T23:59:59.000Z

294

Manufacture and properties of continuous grain flow crankshafts for locomotive and power generation diesel engines  

SciTech Connect (OSTI)

The bulk of the large crankshaft production volume is associated with the medium speed diesel engine market. These engines have seen intense development to obtain higher power outputs without change in the physical size of the crankshaft and at the same time there has been continuing pressure to reduce costs. Fatigue and bearing normal wear are the major technical hurdles that threaten the crankshaft life, and measures for dealing with these issues are described. Continuous grain flow (CGF) crankshafts are responsible for the continued integrity of these enhanced power output engines and the production of these crankshafts is described. Comparisons are made with the older slab forging crankshaft production method. The demand for the medium speed diesel engine and its natural gas derivative is strong and supports an aggressive engine building industry serving locomotive, marine and power generation markets. This demand in turn relies on practical national standards that serve the needs of the engine builder, material supplier and the end user.

Antos, D.J.; Nisbett, E.G. [National Forge Co., Irvine, PA (United States)

1997-12-31T23:59:59.000Z

295

Numerical Polynomial Homotopy Continuation Method to Locate All The Power Flow Solutions  

E-Print Network [OSTI]

The manuscript addresses the problem of finding all solutions of power flow equations or other similar nonlinear system of algebraic equations. This problem arises naturally in a number of power systems contexts, most importantly in the context of direct methods for transient stability analysis and voltage stability assessment. We introduce a novel form of homotopy continuation method called the numerical polynomial homotopy continuation (NPHC) method that is mathematically guaranteed to find all the solutions without ever encountering a bifurcation. The method is based on embedding the real form of power flow equation in complex space, and tracking the generally unphysical solutions with complex values of real and imaginary parts of the voltage. The solutions converge to physical real form in the end of the homotopy. The so-called $\\gamma$-trick mathematically rigorously ensures that all the paths are well-behaved along the paths, so unlike other continuation approaches, no special handling of bifurcations is necessary. The method is \\textit{embarrassingly parallelizable} and can be applied to reasonably large sized systems. We demonstrate the technique by analysis of several standard test cases up to the 14-bus system size. Finally, we discuss possible strategies for scaling the method to large size systems, and propose several applications for transient stability analysis and voltage stability assessment.

Dhagash Mehta; Hung Nguyen; Konstantin Turitsyn

2014-08-12T23:59:59.000Z

296

Detailed analysis of an endoreversible fuel cell : Maximum power and optimal operating temperature determination  

E-Print Network [OSTI]

Producing useful electrical work in consuming chemical energy, the fuel cell have to reject heat to its surrounding. However, as it occurs for any other type of engine, this thermal energy cannot be exchanged in an isothermal way in finite time through finite areas. As it was already done for various types of systems, we study the fuel cell within the finite time thermodynamics framework and define an endoreversible fuel cell. Considering different types of heat transfer laws, we obtain an optimal value of the operating temperature, corresponding to a maximum produced power. This analysis is a first step of a thermodynamical approach of design of thermal management devices, taking into account performances of the whole system.

A. Vaudrey; P. Baucour; F. Lanzetta; R. Glises

2010-08-30T23:59:59.000Z

297

Detailed analysis of an endoreversible fuel cell : Maximum power and optimal operating temperature determination  

E-Print Network [OSTI]

Producing useful electrical work in consuming chemical energy, the fuel cell have to reject heat to its surrounding. However, as it occurs for any other type of engine, this thermal energy cannot be exchanged in an isothermal way in finite time through finite areas. As it was already done for various types of systems, we study the fuel cell within the finite time thermodynamics framework and define an endoreversible fuel cell. Considering different types of heat transfer laws, we obtain an optimal value of the operating temperature, corresponding to a maximum produced power. This analysis is a first step of a thermodynamical approach of design of thermal management devices, taking into account performances of the whole system.

Vaudrey, A; Lanzetta, F; Glises, R

2009-01-01T23:59:59.000Z

298

Real-Time Combined Heat and Power Operational Strategy Using a Hierarchical Optimization Algorithm  

SciTech Connect (OSTI)

Existing attempts to optimize the operation of Combined Heat and Power (CHP) systems for building applications have two major limitations: the electrical and thermal loads are obtained from historical weather profiles; and the CHP system models ignore transient responses by using constant equipment efficiencies. This paper considers the transient response of a building combined with a hierarchical CHP optimal control algorithm to obtain a real-time integrated system that uses the most recent weather and electric load information. This is accomplished by running concurrent simulations of two transient building models. The first transient building model uses current as well as forecast input information to obtain short term predictions of the thermal and electric building loads. The predictions are then used by an optimization algorithm, i.e., a hierarchical controller, that decides the amount of fuel and of electrical energy to be allocated at the current time step. In a simulation, the actual physical building is not available and, hence, to simulate a real-time environment, a second, building model with similar but not identical input loads are used to represent the actual building. A state-variable feedback loop is completed at the beginning of each time step by copying, i.e., measuring, the state variable from the actual building and restarting the predictive model using these ?measured? values as initial conditions. The simulation environment presented in this paper features nonlinear effects such as the dependence of the heat exchanger effectiveness on their operating conditions. The results indicate that the CHP engine operation dictated by the proposed hierarchical controller with uncertain weather conditions have the potential to yield significant savings when compared to conventional systems using current values of electricity and fuel prices.

Yun, Kyung Tae; Cho, Heejin; Luck, Rogelio; Mago, Pedro J.

2011-06-01T23:59:59.000Z

299

Joint Optimization of Idle and Cooling Power in Data Centers While Maintaining Response Time  

E-Print Network [OSTI]

power, where the total electric power = server power + cooling power + power distribution losses. Mod). Previous server- power proposals exploit this under-utilization to reduce the server idle power by keeping service providers, data centers reduce the total cost for the service providers. However, electric power

Vijaykumar, T. N.

300

Using HOMER Software, NREL's Micropower Optimization Model, to Explore the Role of Gen-sets in Small Solar Power Systems; Case Study: Sri Lanka  

SciTech Connect (OSTI)

This paper discusses using HOMER Software, NREL's Micropower Optimization Model, to explore the role of gen-sets in small solar power systems in Sri Lanka.

Givler, T.; Lilienthal, P.

2005-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

AVTA: Vehicle to Grid Power Flow Regulations and Building Codes Review  

Broader source: Energy.gov [DOE]

The Vehicle Technologies Office's Advanced Vehicle Testing Activity carries out testing on a wide range of advanced vehicles and technologies on dynamometers, closed test tracks, and on-the-road. These results provide benchmark data that researchers can use to develop technology models and guide future research and development. The following report is a review of Vehicle-to-Grid power flow regulations and building codes, as informed by the AVTA's testing on plug-in electric vehicle charging equipment. This research was conducted by Idaho National Laboratory.

302

Application Study of the Pump Water Flow Station for Building Energy Consumption Monitoring and Control Optimization  

E-Print Network [OSTI]

. For example, the Venturi meter is commonly used for steam flow measurement, but it is less commonly used for water flow measurement because of the poor accuracy at low flow rates and high installation cost. 2) Displacement flow meter: The meter works... by using the fluid to rotate or displace a device inserted into the flow stream, e.g., a turbine flow meter, tangential paddlewheel meter, etc. It causes extra pressure drop. The bearing wears out and calibration is often needed to ensure accuracy...

Liu, G.; Liu, M.

2006-01-01T23:59:59.000Z

303

Optimal Synthesis of a Pulverized Coal Power Plant with Carbon Capture  

SciTech Connect (OSTI)

Coal constitutes an important source of fuel for the production of power in the United States. For instance, in January 2009, pulverized coal (PC) power plants alone contributed to over 45 percent of the Nation's total electric power production. However, PC power plants also contribute to increased emissions of greenhouse gases principally carbon-dioxide (CO2). Recently, various carbon capture strategies have been under active investigation so as to make these plants compete with the more environmental friendly renewable energy sources. One such technology that has received considerable success is the capture of CO2 by an amine-based solvent extraction process. However, an aqueous absorption/stripping technology when used in a PC power plant can reduce the net power output of the plant by as much as 20-40%. The energy penalty comes from heating up the solvent in the regenerator, balancing the enthalpy of reaction, and water stripping. This energy penalty poses considerable limitations on commercial viability of the solvent extraction process and, as a result, various energy-saving modifications have been proposed in the literature ranging from the use of hybrid solvents to novel stripper configurations. In this paper, we show that the energy penalty can be further reduced by heat integration of various PC plant components with the carbon capture system. In addition to the release of greenhouse gases to the environment, PC plants also consume a large amount of freshwater. It is estimated that subcritical and supercritical PC plants have water losses of 714 gal/MWh and 639 gal/MWh, respectively. Water loss is based on an overall balance of the plant source and exit streams. This includes coal moisture, air humidity, process makeup, cooling tower makeup (equivalent to evaporation plus blowdown), process losses (including losses through reactions, solids entrainment, and process makeup/blowdown) and flue gas losses. The primary source of water used in PC power plants is the closed-loop steam-based (Rankine) power cycles. These plants need to condense large quantities of low-pressure steam back to water so that it can be reused to produce high pressure steam. However, this requires the removal of large quantities of heat from the low pressure steam in the condensation process. This is usually done by transferring the heat to cooling water, which in turn transfers this heat to the environment by evaporation to the atmosphere. Also, the inclusion of a carbon capture process can increase the raw water usage by as much as 95 percent. In this work, we use heat exchanger network synthesis followed by an optimization approach to process synthesis for developing strategies for reducing water use in a supercritical PC power plant with a carbon capture and compression system. Uncertainties associated with dry bulb temperature, relative humidity, and demand will also be considered in this analysis.

Prakash R. Kotecha; Juan M. Salazar; Stephen Zitney

2009-01-01T23:59:59.000Z

304

Mixed Aleatory/Epistemic Uncertainty Quantification for Hypersonic Flows via Gradient-Based Optimization  

E-Print Network [OSTI]

Mixed Aleatory/Epistemic Uncertainty Quantification for Hypersonic Flows via Gradient/aleatory uncertainties is demonstrated within the context of hypersonic flows. Specifically, this work focuses in which experimental data is difficult or impossible to obtain, as is the case with hypersonic flows

Anitescu, Mihai

305

Optimal selection of on-site generation with combined heat and power applications  

E-Print Network [OSTI]

Modeling with Combined Heat and Power Applications. LBNL-Tax on Microgrid Combined Heat and Power Adoption. JournalGeneration with Combined Heat and Power Applications Afzal

Siddiqui, Afzal S.; Marnay, Chris; Bailey, Owen; Hamachi LaCommare, Kristina

2004-01-01T23:59:59.000Z

306

Optimizing control flow in loops using interval anddependence analysis  

E-Print Network [OSTI]

graphics mpgdec-initdec mpgenc-vh?lter mp3-psych mp3-align mpgenc-idct mpgdec-vh?lter Optimizing control ?graphics mpgdec-initdec mpgenc-vh?lter mp3-psych mp3-align mpgenc-idct mpgdec-vh?lter Optimizing control ?graphics mpgdec-initdec mpgenc-vh?lter mp3-psych mp3-align mpgenc-idct mpgdec-vh?lter Optimizing control ?

Ghodrat, Mohammad Ali; Givargis, Tony; Nicolau, Alex

2009-01-01T23:59:59.000Z

307

Dynamics, Optimization and Control of a Fuel Cell Based Combined Heat Power (CHP) System for Shipboard Applications  

E-Print Network [OSTI]

Dynamics, Optimization and Control of a Fuel Cell Based Combined Heat Power (CHP) System, a natural gas fuel processor system (FPS), a proton exchange membrane fuel cell (PEM-FC) and a catalytic) systems based on fuel cells and fuel processing technologies have great potential for future shipboard

Stefanopoulou, Anna

308

OpenPEOPLE D2.8 Ergonomic Page 1/37 Open Power and Energy Optimization Platform and Estimator  

E-Print Network [OSTI]

OpenPEOPLE D2.8­ Ergonomic Page 1/37 OpenPEOPLE Open Power and Energy Optimization Platform and Estimator Internal Deliverable 2.8 Ergonomics Document Manager Contributors Checked by Name Jonathan PONROY ergonomic for the OpenPEOPLE software platform. inria-00624000,version1-16Sep2011 #12;OpenPEOPLE D2

Paris-Sud XI, Université de

309

A thermodynamic hypothesis regarding optimality principles for flow processes in geosystems  

E-Print Network [OSTI]

a review of the maximum entropy production principle. RevSeleznev VD (2006) Maximum entropy pro- duction principle inexpenditure rate Maximum entropy production Optimality

Liu, Hui-Hai

2015-01-01T23:59:59.000Z

310

Abstract--Although Locational Marginal Pricing (LMP) plays an important role in many restructured wholesale power  

E-Print Network [OSTI]

1 Abstract-- Although Locational Marginal Pricing (LMP) plays an important role in many Terms-- Locational marginal pricing, wholesale power market, AC optimal power flow, DC optimal power congestion by means of Locational Marginal Pricing (LMP), i.e., the pricing of power by the location

Tesfatsion, Leigh

311

Nonlinear power flow feedback control for improved stability and performance of airfoil sections  

DOE Patents [OSTI]

A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, .alpha.. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K.sub.I, K.sub.p, and K.sub.d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.

Wilson, David G.; Robinett, III, Rush D.

2013-09-03T23:59:59.000Z

312

On Reactive Power Flow and Voltage Stability in Microgrids Basilio Gentile, John W. Simpson-Porco, Florian Dorfler, Sandro Zampieri, and Francesco Bullo  

E-Print Network [OSTI]

], where an approximate solution to the reactive power flow equations was developed for electrical networksOn Reactive Power Flow and Voltage Stability in Microgrids Basilio Gentile, John W. Simpson-Porco, Florian D¨orfler, Sandro Zampieri, and Francesco Bullo Abstract-- This paper focuses on reactive power

Bullo, Francesco

313

EV Charging Through Wireless Power Transfer: Analysis of Efficiency Optimization and Technology Trends  

SciTech Connect (OSTI)

This paper is aimed at reviewing the technology trends for wireless power transfer (WPT) for electric vehicles (EV). It also analyzes the factors affecting its efficiency and describes the techniques currently used for its optimization. The review of the technology trends encompasses both stationary and moving vehicle charging systems. The study of the stationary vehicle charging technology is based on current implementations and on-going developments at WiTricity and Oak Ridge National Lab (ORNL). The moving vehicle charging technology is primarily described through the results achieved by the Korean Advanced Institute of Technology (KAIST) along with on-going efforts at Stanford University. The factors affecting the efficiency are determined through the analysis of the equivalent circuit of magnetic resonant coupling. The air gap between both transmitting and receiving coils along with the magnetic field distribution and the relative impedance mismatch between the related circuits are the primary factors affecting the WPT efficiency. Currently the industry is looking at an air gap of 25 cm or below. To control the magnetic field distribution, Kaist has recently developed the Shaped Magnetic Field In Resonance (SMFIR) technology that uses conveniently shaped ferrite material to provide low reluctance path. The efficiency can be further increased by means of impedance matching. As a result, Delphi's implementation of the WiTricity's technology exhibits a WPT efficiency above 90% for stationary charging while KAIST has demonstrated a maximum efficiency of 83% for moving vehicle with its On Line Vehicle (OLEV) project. This study is restricted to near-field applications (short and mid-range) and does not address long-range technology such as microwave power transfer that has low efficiency as it is based on radiating electromagnetic waves. This paper exemplifies Delphi's work in powertrain electrification as part of its innovation for the real world program geared toward a safer, greener and more connected driving. Moreover, it draws from and adds to Dr. Andrew Brown Jr.'s SAE books 'Active Safety and the Mobility Industry', 'Connectivity and Mobility Industry', and 'Green Technologies and the Mobility Industry'. Magnetic resonant coupling is the foundation of modern wireless power transfer. Its efficiency can be controlled through impedance matching and magnetic field shaping. Current implementations use one or both of these control methods and enable both stationary and mobile charging with typical efficiency within the 80% and 90% range for an air gap up to 25 cm.

Miller, John M [ORNL; Rakouth, Heri [Delphi Automotive Systems, USA; Suh, In-Soo [Korea Advanced Institute of Science and Technology

2012-01-01T23:59:59.000Z

314

OPTIMAL CONTROL OF PARTIALLY MISCIBLE TWO-PHASE FLOW WITH APPLICATIONS TO SUBSURFACE CO2 SEQUESTRATION  

E-Print Network [OSTI]

control problems that are governed by multiphase multicomponent flow in porous media. The concrete in porous media. The objective is, e.g., to maximize the amount of trapped CO2 in an underground reservoir/FV methods for multiphase multicomponent flows in porous media we refer to [11] and references therein

Ulbrich, Michael

315

Optimal Contool for a Mixed Flow of Hamiltonian and Gradient Type in Space of Probability Measures  

E-Print Network [OSTI]

Abstract. In this paper we investigate an optimal control problem in the space of measures on R2. The problem is motivated by a stochastic interacting particle model which gives the 2-D Navier-Stokes equations in their ...

Feng, Jin; Swiech, Andrezej; Stefanov, Atanas

2013-08-01T23:59:59.000Z

316

On-chip interconnection architecture optimization using a multicommodity flow approach  

E-Print Network [OSTI]

to re- duce its energy and switch area-e?ciency. Theectively reduce energy and switch area usage of FPGA routingectively optimize the energy and switch area of FPGA routing

Hu, Yuanfang

2007-01-01T23:59:59.000Z

317

Ice Shelves as Floating Channel Flows of Viscous Power-Law Fluids  

E-Print Network [OSTI]

We attempt to better understand the flow of marine ice sheets. Treating ice as a viscous shear-thinning power law fluid, we develop an asymptotic (late-time) theory in two cases - the presence or absence of contact with sidewalls. Most real-world situations fall somewhere between the two extreme cases considered. When sidewalls are absent, we obtain the equilibrium grounding line thickness using a simple computer model and have an analytic approximation. For shelves in contact with sidewalls, we obtain an asymptotic theory, valid for long shelves. Our theory is based on the velocity profile across the channel being a generalised version of Poiseuille flow, which works when lateral shear dominates the force balance. We determine when this is. We conducted experiments using a laboratory model for ice. This was a suspension of xanthan in water, at a concentration of 0.5% by mass. The lab model has $n \\approx 3.8$ (similar to that of ice). The experiments agreed extremely well with our theories for all relevant p...

Banik, Indranil

2013-01-01T23:59:59.000Z

318

An Improved Lagrangian Relaxation Method for VLSI Combinational Circuit Optimization  

E-Print Network [OSTI]

Gate sizing and threshold voltage (Vt) assignment are very popular and useful techniques in current very large scale integration (VLSI) design flow for timing and power optimization. Lagrangian relaxation (LR) is a common method for handling multi...

Huang, Yi-Le

2012-02-14T23:59:59.000Z

319

Optimizing membrane electrode assembly of direct methanol fuel cells for portable power.  

E-Print Network [OSTI]

??Direct methanol fuel cells (DMFCs) for portable power applications require high power density, high-energy conversion efficiency and compactness. These requirements translate to fundamental properties of (more)

Liu, Fuqiang

2006-01-01T23:59:59.000Z

320

Optimum Capacity Allocation of DG Units Based on Unbalanced Three-phase Optimal Power Flow  

E-Print Network [OSTI]

. Index Terms--Planning for Smart Grid , Unbalanced TOPF, Swarm Intelligence, DG Capacity Allocation, Smart Grid Co- simulation Platform. I. INTRODUCTION The growth of energy demand is increasing rapidly distribution system planning is necessary. Adnan Anwar and H. R. Pota are with the School of Engineering

Pota, Himanshu Roy

Note: This page contains sample records for the topic "optimal power flow" 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

CHANCE CONSTRAINED OPTIMAL POWER FLOW: RISK-AWARE NETWORK CONTROL UNDER UNCERTAINTY  

E-Print Network [OSTI]

which compromises stability. Smart grid goals include a commitment to large penetration of highly and careful long-term planning, with only very rare disruptions. However, the grid is under growing stress generation (coal, gas and hy- dro plants) over control areas of transmission networks, can result in grid

Bienstock, Daniel

322

CHANCE CONSTRAINED OPTIMAL POWER FLOW: RISK-AWARE NETWORK CONTROL UNDER UNCERTAINTY  

E-Print Network [OSTI]

which compromises stability. Smart grid goals include a commitment to large penetration of highly control sophistication and careful long-term planning. Nevertheless, the grid is under growing stress generation (coal, gas and hy- dro plants) over control areas of transmission networks, can result in grid

Bienstock, Daniel

323

Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson 2007) |  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating Solar Powerstories onFocus AreaDataBusPFAN)ChangeOnPACenEdit Historypage

324

Flow Components in a NaK Test Loop Designed to Simulate Conditions in a Nuclear Surface Power Reactor  

SciTech Connect (OSTI)

A test loop using NaK as the working fluid is presently in use to study material compatibility effects on various components that comprise a possible nuclear reactor design for use on the lunar surface. A DC electromagnetic (EM) pump has been designed and implemented as a means of actively controlling the NaK flow rate through the system and an EM flow sensor is employed to monitor the developed flow rate. These components allow for the matching of the flow rate conditions in test loops with those that would be found in a full-scale surface-power reactor. The design and operating characteristics of the EM pump and flow sensor are presented. In the EM pump, current is applied to a set of electrodes to produce a Lorentz body force in the fluid. A measurement of the induced voltage (back-EMF) in the flow sensor provides the means of monitoring flow rate. Both components are compact, employing high magnetic field strength neodymium magnets thermally coupled to a water-cooled housing. A vacuum gap limits the heat transferred from the high temperature NaK tube to the magnets and a magnetically-permeable material completes the magnetic circuit. The pump is designed to produce a pressure rise of 34.5 kPa, and the flow sensor's predicted output is roughly 20 mV at the loop's nominal flow rate of 0.114 m{sup 3}/hr.

Polzin, Kurt A.; Godfroy, Thomas J. [NASA Marshall Space Flight Center Propulsion Research and Technology Applications Branch/ER24, MSFC, AL 35812 (United States)

2008-01-21T23:59:59.000Z

325

LQ Optimal Control of Wind Turbines in Hybrid Power Systems N.A. Cutululis1  

E-Print Network [OSTI]

taken into account for the design of a wind ­ diesel power system is the wind power penetration, which electrical load. However, the penetration of wind power into small diesel-based grids is limited because variations is well suited for operating in small wind ­ diesel power systems. The antagonistic demands

326

Performance Optimization of a Photovoltaic Generator with an Active Power Filter Application  

E-Print Network [OSTI]

with their benefits are not yet implemented for the PV application. Power output of a solar PV module changes to an electrical system here we use the active power filter. To maximize the PV panel output power, perturb and variation of the DC bus due to losses in the active power filter (transistors and the output filter

Paris-Sud XI, Université de

327

Optimized Flow Sheet for a Reference Commercial-Scale Nuclear-Driven High-Temperature Electrolysis Hydrogen Production Plant  

SciTech Connect (OSTI)

This report presents results from the development and optimization of a reference commercialscale high-temperature electrolysis (HTE) plant for hydrogen production. The reference plant design is driven by a high-temperature helium-cooled reactor coupled to a direct Brayton power cycle. The reference design reactor power is 600 MWt, with a primary system pressure of 7.0 MPa, and reactor inlet and outlet fluid temperatures of 540 C and 900C, respectively. The electrolysis unit used to produce hydrogen consists of 4.176 10 6 cells with a per-cell active area of 225 cm2. A nominal cell area-specific resistance, ASR, value of 0.4 Ohmcm2 with a current density of 0.25 A/cm2 was used, and isothermal boundary conditions were assumed. The optimized design for the reference hydrogen production plant operates at a system pressure of 5.0 MPa, and utilizes an air-sweep system to remove the excess oxygen that is evolved on the anode side of the electrolyzer. The inlet air for the air-sweep system is compressed to the system operating pressure of 5.0 MPa in a four-stage compressor with intercooling. The overall system thermal-to-hydrogen production efficiency (based on the low heating value of the produced hydrogen) is 49.07% at a hydrogen production rate of 2.45 kg/s with the high-temperature helium-cooled reactor concept. The information presented in this report is intended to establish an optimized design for the reference nuclear-driven HTE hydrogen production plant so that parameters can be compared with other hydrogen production methods and power cycles to evaluate relative performance characteristics and plant economics.

M. G. McKellar; J. E. O'Brien; E. A. Harvego; J. S. Herring

2007-11-01T23:59:59.000Z

328

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

77 5.2 Wind Energy Conversion System . . . . .Optimization and Control in Wind Energy Conversion SystemsAC matrix con- verter for wind energy conversion system, in

Ghaffari, Azad

2013-01-01T23:59:59.000Z

329

Design and optimization of high-performance low-power CMOS VLSI interconnects  

E-Print Network [OSTI]

total delay and energy dissipation of pipelined globaltotal energy of parallel wires under the total throughput constraint [15]. Max-TPA is utilized for optimizing global

Zhang, Yulei

2011-01-01T23:59:59.000Z

330

Novel Insights into Lossless AC and DC Power Flow Florian Dorfler, Student Member, IEEE, and Francesco Bullo, Fellow, IEEE  

E-Print Network [OSTI]

1 Novel Insights into Lossless AC and DC Power Flow Florian D¨orfler, Student Member, IEEE work supported by NSF grant CPS- 1135819. Florian D¨orfler and Francesco Bullo are with the Center 93106. Email: {dorfler,bullo}@engineering.ucsb.edu approximation only near an operating point with small

Bullo, Francesco

331

An Energy-Flow Model for Self-Powered Routers and its Application for Energy-Aware Routing  

E-Print Network [OSTI]

, Design, Measurement, Performance, Reliability Keywords Energy efficiency, Rural wireless networks, EnergyAn Energy-Flow Model for Self-Powered Routers and its Application for Energy-Aware Routing Veljko Internet access in many rural areas of the developed and, especially, the developing world. The quality

Belding-Royer, Elizabeth M.

332

Improving electricity production in tubular microbial fuel cells through optimizing the anolyte flow with spiral spacers  

E-Print Network [OSTI]

Improving electricity production in tubular microbial fuel cells through optimizing the anolyte h l i g h t s " The spiral spacers improve electricity production in tubular microbial fuel cells fuel cells Spiral spacers Energy Wastewater treatment a b s t r a c t The use of spiral spacers

333

Optimization of Electrical Production The production of electricity in France is optimized everyday  

E-Print Network [OSTI]

French Model n [ 200] existing power units thermal nuclear fuel+coal 80% 3% hydro-valleys 17Optimization of Electrical Production The production of electricity in France is optimized everyday values: 0, pmin, pinter, pmax) = amenable to dynamic programming Hydro-Valleys Control variable = flow

334

Derivation of Locational Marginal Prices for Restructured Wholesale Power Markets  

E-Print Network [OSTI]

Derivation of Locational Marginal Prices for Restructured Wholesale Power Markets Haifeng Liu restructured wholesale power markets, the detailed derivation of LMPs as actually used in industry practice Operator (MISO). Keywords: Locational marginal pricing, wholesale power market, AC optimal power flow, DC

Tesfatsion, Leigh

335

IEEE TRANSACTIONS ON POWER SYSTEMS (TO APPEAR) 1 Optimal Placement of Phasor Measurement  

E-Print Network [OSTI]

estimation is at the core of grid monitoring, PMU deployment is optimized here based on estimation-theoretic criteria. Considering both voltage and incident current readings per PMU-instrumented bus and incorporating conventionally derived state estimates under the Bayesian framework, PMU placement is formulated as an optimal

Giannakis, Georgios

336

Optimal control system design of an acid gas removal unit for an IGCC power plants with CO2 capture  

SciTech Connect (OSTI)

Future IGCC plants with CO{sub 2} capture should be operated optimally in the face of disturbances without violating operational and environmental constraints. To achieve this goal, a systematic approach is taken in this work to design the control system of a selective, dual-stage Selexol-based acid gas removal (AGR) unit for a commercial-scale integrated gasification combined cycle (IGCC) power plant with pre-combustion CO{sub 2} capture. The control system design is performed in two stages with the objective of minimizing the auxiliary power while satisfying operational and environmental constraints in the presence of measured and unmeasured disturbances. In the first stage of the control system design, a top-down analysis is used to analyze degrees of freedom, define an operational objective, identify important disturbances and operational/environmental constraints, and select the control variables. With the degrees of freedom, the process is optimized with relation to the operational objective at nominal operation as well as under the disturbances identified. Operational and environmental constraints active at all operations are chosen as control variables. From the results of the optimization studies, self-optimizing control variables are identified for further examination. Several methods are explored in this work for the selection of these self-optimizing control variables. Modifications made to the existing methods will be discussed in this presentation. Due to the very large number of candidate sets available for control variables and due to the complexity of the underlying optimization problem, solution of this problem is computationally expensive. For reducing the computation time, parallel computing is performed using the Distributed Computing Server (DCS) and the Parallel Computing toolbox from Mathworks. The second stage is a bottom-up design of the control layers used for the operation of the process. First, the regulatory control layer is designed followed by the supervisory control layer. Finally, an optimization layer is designed. In this paper, the proposed two-stage control system design approach is applied to the AGR unit for an IGCC power plant with CO{sub 2} capture. Aspen Plus Dynamics is used to develop the dynamic AGR process model while MATLAB is used to perform the control system design and for implementation of model predictive control (MPC).

Jones, D.; Bhattacharyya, D.; Turton, R.; Zitney, S.

2012-01-01T23:59:59.000Z

337

Aerodynamic Shape Optimization of Airfoils in Ultra-Low Reynolds Number Flow using  

E-Print Network [OSTI]

on the upper surface of the airfoil at a quite low lift coefficient. The position of this bubble depends in the lift coefficient and an increase in the drag coefficient, leading to a drastic reduction for the flow modelling. The cell-centered finite volume method together with the artificial dissipation

Stanford University

338

Telecommunication Systems 0 (2000) 1--18 1 Optimization Flow Control with Newton--Like  

E-Print Network [OSTI]

, and it chooses a transmission rate x s that maximizes its own benefit U s (x s ) \\Gamma p s x s , utility minus to flow control where the objective is to maximize the aggregate source utility over their transmission Government for their Australian Postgraduate Award, and the second author acknowledges the support

Low, Steven H.

339

Optimizing the Configuration and Control of a Novel Human-Powered Energy Harvesting System  

E-Print Network [OSTI]

human foot-strikes and power low-power wearable systems in a self-sustaining manner. Dielectric the energy produced by a user's foot strikes and drive a target wearable system in a self-sustaining manner

Potkonjak, Miodrag

340

Optimization of Cricket-inspired, Biomimetic Artificial Hair Sensors for Flow Sensing  

E-Print Network [OSTI]

High density arrays of artificial hair sensors, biomimicking the extremely sensitive mechanoreceptive filiform hairs found on cerci of crickets have been fabricated successfully. We assess the sensitivity of these artificial sensors and present a scheme for further optimization addressing the deteriorating effects of stress in the structures. We show that, by removing a portion of chromium electrodes close to the torsional beams, the upward lift at the edges of the membrane due to the stress, will decrease hence increase the sensitivity.

Izadi, N; Floris, J; Krijnen, G

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

The optimization problem Genetic Algorithm  

E-Print Network [OSTI]

The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results for time-power optimization META, October 27-31, 2014 1 / 25 #12;The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results Conclusions Time and energy optimization Traditionally

Giménez, Domingo

342

OPTIMAL POWER ALLOCATION UNDER PER-MODEM TOTAL POWER AND SPECTRAL MASK CONSTRAINTS IN XDSL VECTOR CHANNELS WITH ALIEN CROSSTALK  

E-Print Network [OSTI]

CHANNELS WITH ALIEN CROSSTALK Vincent Le Nir, Marc Moonen, Jan Verlinden Katholieke Universiteit Leuven of do- main or alien crosstalk requires a more advanced processing. In vector channels, Multiple Input. In this paper, we investigate the problem of power allocation in xDSL vector channels under in-domain and alien

343

Summary of Papers 1. P. Sauer and M. Pai, "Power System SteadyState Stability and the Load Flow Jacobian," IEEE  

E-Print Network [OSTI]

Summary of Papers 1. P. Sauer and M. Pai, "Power System SteadyState Stability and the Load Flow, "The Continuation Power Flow: A Tool for SteadyState Voltage Stability Analysis," IEEE Transactions of the system to maintain adequate and controllable voltage levels at all system load buses. The main concern

McCalley, James D.

344

Suction-recirculation device for stabilizing particle flows within a solar powered solid particle receiver  

DOE Patents [OSTI]

A suction-recirculation device for stabilizing the flow of a curtain of blackened heat absorption particles falling inside of a solar receiver with an open aperture. The curtain of particles absorbs the concentrated heat from a solar mirror array reflected up to the receiver on a solar power tower. External winds entering the receiver at an oblique angle can destabilize the particle curtain and eject particles. A fan and ductwork is located behind the back wall of the receiver and sucks air out through an array of small holes in the back wall. Any entrained particles are separated out by a conventional cyclone device. Then, the air is recirculated back to the top of the receiver by injecting the recycled air through an array of small holes in the receiver's ceiling and upper aperture front wall. Since internal air is recirculated, heat losses are minimized and high receiver efficiency is maintained. Suction-recirculation velocities in the range of 1-5 m/s are sufficient to stabilize the particle curtain against external wind speeds in excess of 10 m/s.

Kolb, Gregory J. (Albuquerque, NM)

2012-02-07T23:59:59.000Z

345

Simulation and Optimization on Power Plant Operation Using SEGA's EOP Program  

E-Print Network [OSTI]

operation under different conditions was investigated. Further more, (online) operational optimization is made possible by load re-assignment according to EOP's calculation. Other researches on plant operation, such as the impact of utility rates...

Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.

346

Simulation and Optimization on Power Plant Operation Using Sega's EOP Program  

E-Print Network [OSTI]

operation under different conditions was investigated. Further more, (online) operational optimization is made possible by load reassignment according to EOP's calculation. Other researches on plant operation, such as the impact of utility rates...

Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.

2000-01-01T23:59:59.000Z

347

Design, integration schemes, and optimization of conventional and pressurized oxy-coal power generation processes  

E-Print Network [OSTI]

Efficient and clean electricity generation is a major challenge for today's world. Multivariable optimization is shown to be essential in unveiling the true potential and the high efficiency of pressurized oxy-coal combustion ...

Zebian, Hussam

2014-01-01T23:59:59.000Z

348

Dynamic Network Flow Optimization Models for Air Vehicle Resource Allocation Kendall E. Nygard, Professor  

E-Print Network [OSTI]

Institute of Technology (AFIT/ENG) Wright-Patterson AFB, OH 45433 Abstract A weapon system consisting control. I. Introduction Autonomous wide area search weapon systems are small powered munitions, each cooperatively to more efficiently and effectively carry out search, target classification, attack, and battle

Nygard, Kendall E.

349

Power, Efficiency, and Emissions Optimization of a Single Cylinder Direct-Injected Diesel Engine for Testing of Alternative Fuels through Heat Release Modeling  

E-Print Network [OSTI]

Power, Efficiency, and Emissions Optimization of a Single Cylinder Direct-Injected Diesel Engine for Testing of Alternative Fuels through Heat Release Modeling BY Jonathan Michael Stearns Mattson Submitted to the graduate degree program..., Efficiency, and Emissions Optimization of a Single Cylinder Direct-Injected Diesel Engine for Testing of Alternative Fuels through Heat Release Modeling BY Jonathan Michael Stearns Mattson...

Mattson, Jonathan Michael Stearns

2013-08-31T23:59:59.000Z

350

Journal of Power Sources, Vol.165, issue 2, March 2007, pp.819-832. Abstract--Power management strategy is as significant as component sizing in achieving optimal fuel economy of a  

E-Print Network [OSTI]

Management and Design Optimization of Fuel Cell/Battery Hybrid Vehicles #12;Journal of Power Sources, Vol.165 strategy is as significant as component sizing in achieving optimal fuel economy of a fuel cell hybrid management strategy and component sizing affect vehicle performance and fuel economy considerably in hybrid

Peng, Huei

351

Optimization of PHEV Power Split Gear Ratio to Minimize Fuel Consumption and Operation Cost.  

E-Print Network [OSTI]

??A Plug-in Hybrid Electric Vehicle (PHEV) is a vehicle powered by a combination of an internal combustion engine and an electric motor with a battery (more)

Li, Yanhe

2013-01-01T23:59:59.000Z

352

Discrete linear constrained multivariate optimization for power sources of mobile systems.  

E-Print Network [OSTI]

??Unmanned ground and aerial vehicles (UGVs and UAVs) have strict payload limitations, limited free space affecting on board power availability resulting in limited endurance and (more)

Ioannou, Stelios G

2008-01-01T23:59:59.000Z

353

Event-Triggered Optimal Power Dispatch M.D. Lemmon, University of Notre Dame  

E-Print Network [OSTI]

Microgrids [14] [11] [9] are power generation/distribution systems in which users and gen- erators done using renewable generation sources such as photovoltaic cells or wind turbines. Power generation can also be accomplished through small microturbines and gas/diesel generators. Storage devices

Lemmon, Michael

354

Design, Analysis and Optimization of the Power Conversion System for the Modular Pebble Bed Reactor System  

E-Print Network [OSTI]

Pebble Bed Reactor system (MPBR) requires a gas turbine cycle (Brayton cycle) as the power conversion for the gas turbine cycle. The development of an initial reference design for an indirect helium cycle has for the system. Load transients simulations show that the indirect, three-shaft arrangement gas turbine power

355

EXPERT TOOLS FOR QSAR ANALYSIS AND LEAD OPTIMIZATION The basic tools needed to build powerful, predictive models of biological activity (or any other property) from molecu-  

E-Print Network [OSTI]

EXPERT TOOLS FOR QSAR ANALYSIS AND LEAD OPTIMIZATION The basic tools needed to build powerful in SYBYL's QSAR module. These include molecular field generation tools, least-squares (PLS, PCA and SIMCA) and non-linear (hierarchical clustering) analysis tools. The most powerful of these techniques can

Ferreira, Márcia M. C.

356

Analysis and optimization of incompressible separated flow around an airfoil with two finite-gap flaps  

E-Print Network [OSTI]

and a 25% Slotted Flap ((2 = 8. 0' 6s = 0. 0 6f = 20 ) 90 91 36 Pressure Distribution, NACA 23012 with a 17% Fixed Slot and a 25% Slotted Flap (o - 8. 0 , 6s = 0. 0 , 6'f - 40 ) 92 37 Drag Coefficient versus Lift Coefficient for a GA(W)-2 with a... distributed vorticity V(s) on B, and 4s is produced by uniformly distributed sources of strength o(s) on B. For two dimensional flow lv and 4s can be written as: ln r(x, z;s')ds' s J02s e = -I'~s' e(x, z;s )as JO 2 s With these definitions, equation (1...

Anderson, Murray Belser

1988-01-01T23:59:59.000Z

357

Start-up Optimization of a Combined Cycle Power Plant A. Linda, E. Sllberga,  

E-Print Network [OSTI]

bModelon AB, Lund, Sweden cSiemens AG, Energy Sector, Erlangen, Germany Abstract In the electricity are simpler than typical high- fidelity simulation models. Two different models used for optimization in four to opti- mize are explored. Results are encouraging and show that energy production during start-up can

358

Power-Aware Speed Scaling in Processor Sharing Systems: Optimality and Adam Wierman  

E-Print Network [OSTI]

been on either (i) minimizing the total energy used in order to complete arriving jobs have neither job completion deadlines nor fixed energy budgets. In these cases, the goal is to optimize is the energy expended on that job, and controls the relative cost of delay. This metric is a practical choice

Andrew, Lachlan

359

Numerical Simulation of the Flow of a Power Law Fluid in an Elbow Bend  

E-Print Network [OSTI]

of shear ? is the power law index Hence the effective viscosity for a power law model is given by, ???? = ? ? ??? (??1) This is also known as the Ostwald-de Waele power law model and it has gained importance because of its simplicity. But, the main...

Kanakamedala, Karthik

2010-07-14T23:59:59.000Z

360

Naval ship propulsion and electric power systems selection for optimal fuel consumption  

E-Print Network [OSTI]

Although propulsion and electric power systems selection is an important part of naval ship design, respective decisions often have to be made without detailed ship knowledge (resistance, propulsors, etc.). Propulsion and ...

Sarris, Emmanouil

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Design, analysis and optimization of the power conversion system for the Modular Pebble Bed Reactor System  

E-Print Network [OSTI]

The Modular Pebble Bed Reactor system (MPBR) requires a gas turbine cycle (Brayton cycle) as the power conversion system for it to achieve economic competitiveness as a GenIV nuclear system. The availability of controllable ...

Wang, Chunyun, 1968-

2003-01-01T23:59:59.000Z

362

Influence of electrode stress on proton exchange membrane fuel cell performance : experimental characterization and power optimization  

E-Print Network [OSTI]

Compressive stress applied to the electrode area of a Proton Exchange Membrane (PEM) fuel cell is known to significantly affect power output. In practice, electrode stress arises during operation due to the clamping force ...

Gallant, Betar M. (Betar Maurkah)

2008-01-01T23:59:59.000Z

363

Development of optimized core design and analysis methods for high power density BWRs  

E-Print Network [OSTI]

Increasing the economic competitiveness of nuclear energy is vital to its future. Improving the economics of BWRs is the main goal of this work, focusing on designing cores with higher power density, to reduce the BWR ...

Shirvan, Koroush

2013-01-01T23:59:59.000Z

364

Feasibility Study of a Multi-Purpose Computer Program for Optimizing Heat Rates in Power Cycles  

E-Print Network [OSTI]

A study of currently available commercial codes which evaluate the thermal performance of turbine cycles in power plants is presented. The analytical basis, capabilities, and possible applications of these codes are described. A survey of some user...

Menuchin, Y.; Singh, K. P.; Hirota, N.

1981-01-01T23:59:59.000Z

365

Thermal desalination : structural optimization and integration in clean power and water  

E-Print Network [OSTI]

A large number of resources are dedicated to seawater desalination and will only grow as world-wide water scarcity increases. In arid areas with high temperature and salinity seawater, thermal desalination and power plants ...

Zak, Gina Marie

2012-01-01T23:59:59.000Z

366

Optimal Design of a PMU-Based Monitoring Architecture for Power  

E-Print Network [OSTI]

. NOMENCLATURE PMU Phasor Measurement Unit. PDC Phasor Data Concentrator. EKF Extended Kalman Filtering measurements. PMU can provide very accurate data since they are synchronized from the common global positioning system (GPS) radio clock. However the use of PMU is more demanding in terms of data flow rates than

Paris-Sud XI, Université de

367

Optimal Power System and Grid Interface Design Considerations for the CLICs Klystron Modulators  

E-Print Network [OSTI]

The Compact Linear Collider (CLIC) is an electron-positron collider under study at CERN with the aim to explore the next generation of high precision/high energy particles physics. The CLICs drive beams will be accelerated by approximately 1300 klystrons, requiring highly efficient and controllable solid state capacitor discharge modulators. Capacitor charger specifications include the requirement to mask the pulsed effect of the load from the utility grid, ensure maximum power quality, control the derived DC voltage precisely (to maximize accuracy for the modulators being implemented), and achieve high efficiency and operability of the overall power system. This paper presents the work carried out on the power system interface for the CLIC facility. In particular it discusses the challenges on the utility interface and analysis of the grid interface converters with regards to required functionality, efficiency, and control methodologies.

Marija, Jankovic; Jon, Clare; Pat, Wheeler; Davide, Aguglia

2015-01-01T23:59:59.000Z

368

Orifice flow measurement uncertainty  

SciTech Connect (OSTI)

A computer program is now available from Union Carbide that evaluates the total flow uncertainty of orifice flowmeter systems. Tolerance values for every component in the system and the sensitivity of the measured flowrate to each component can be established using historical data and published hardware specifications. Knowing the tolerance and sensitivity values, a total measurement uncertainty can be estimated with a 95% confidence level. This computer program provides a powerful design tool to ensure correct component matching and total metering system optimization.

Samples, C.R.

1984-04-01T23:59:59.000Z

369

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

both AC drives and wind energy Turbine, shaft, and Gear BoxWind Energy Conversion Systems using Extremum Seeking Wind turbines (wind energy generation can be realized by capturing wind power at altitudes over the ground that cannot be reached by wind turbines.

Ghaffari, Azad

2013-01-01T23:59:59.000Z

370

Design of a Boost Power Factor Correction Converter Using Optimization Techniques Sergio Busquets-Monge1  

E-Print Network [OSTI]

-end converter with an input electromagnetic interference filter. The system design variables are first correction, boost, electromagnetic interference, electromagnetic compatibility. Paper presented at PESC, June of a boost power factor correction front-end converter with an input electromagnetic interference filter

Lindner, Douglas K.

371

Dynamic Power Optimization of Interactive Systems Lin Zhong and Niraj K. Jha  

E-Print Network [OSTI]

and Related Work We first provide energy usage characteristics of an exam- ple interactive software-- Power has become a major concern for mo- bile computing systems such as laptops and handhelds, on which a significant fraction of software usage is interactive instead of computation-intensive. An analysis shows

Zhong, Lin

372

On the Network Lifetime of Wireless Sensor Networks Under Optimal Power Control  

E-Print Network [OSTI]

significantly reduces energy wastage by utilizing sleep cycles of the radio. In such networks, overhearing causes significant energy losses, especially if the network density is high. Our calculations demonstrate are powered by fixed energy resources such as a battery, and consequently, their utility is limited

Nasipuri, Asis

373

A Design Methodology for Domain-Optimized Power-Efficient Supercomputing  

E-Print Network [OSTI]

. Results demonstrate that co-tuning significantly improves hardware area and energy efficiency ­ a key driver for next generation of HPC system design. 1. INTRODUCTION Energy efficiency is rapidly becoming the primary concern of all large-scale scientific computing facilities. According to power con- sumption data

Wawrzynek, John

374

Method of optimizing performance of Rankine cycle power plants. [US DOE Patent  

DOE Patents [OSTI]

A method is described for efficiently operating a Rankine cycle power plant to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine fluid inlet state which is substantially on the area adjacent and including the transposed critical temperature line.

Pope, W.L.; Pines, H.S.; Doyle, P.A.; Silvester, L.F.

1980-06-23T23:59:59.000Z

375

Multi-hop wireless charging optimization in Low-Power Networks  

E-Print Network [OSTI]

to address the challenging problem of energy consumption in low-power networks. Based on these breakthroughs, none of these works have considered the multihop energy transmission, whose feasibility have been demonstrated recently. In such a system, a node can transmit energy wirelessly to its neighbors. In this paper

Boyer, Edmond

376

Optimization and Comparison of Direct and Indirect Supercritical Carbon Dioxide Power Plant Cycles for Nuclear Applications  

SciTech Connect (OSTI)

There have been a number of studies involving the use of gases operating in the supercritical mode for power production and process heat applications. Supercritical carbon dioxide (CO2) is particularly attractive because it is capable of achieving relatively high power conversion cycle efficiencies in the temperature range between 550 C and 750 C. Therefore, it has the potential for use with any type of high-temperature nuclear reactor concept, assuming reactor core outlet temperatures of at least 550 C. The particular power cycle investigated in this paper is a supercritical CO2 Recompression Brayton Cycle. The CO2 Recompression Brayton Cycle can be used as either a direct or indirect power conversion cycle, depending on the reactor type and reactor outlet temperature. The advantage of this cycle when compared to the helium Brayton cycle is the lower required operating temperature; 550 C versus 850 C. However, the supercritical CO2 Recompression Brayton Cycle requires an operating pressure in the range of 20 MPa, which is considerably higher than the required helium Brayton cycle operating pressure of 8 MPa. This paper presents results of analyses performed using the UniSim process analyses software to evaluate the performance of both a direct and indirect supercritical CO2 Brayton Recompression cycle for different reactor outlet temperatures. The direct supercritical CO2 cycle transferred heat directly from a 600 MWt reactor to the supercritical CO2 working fluid supplied to the turbine generator at approximately 20 MPa. The indirect supercritical CO2 cycle assumed a helium-cooled Very High Temperature Reactor (VHTR), operating at a primary system pressure of approximately 7.0 MPa, delivered heat through an intermediate heat exchanger to the secondary indirect supercritical CO2 Brayton Recompression cycle, again operating at a pressure of about 20 MPa. For both the direct and indirect cycles, sensitivity calculations were performed for reactor outlet temperature between 550 C and 850 C. The UniSim models used realistic component parameters and operating conditions to model the complete reactor and power conversion systems. CO2 properties were evaluated, and the operating ranges of the cycles were adjusted to take advantage of the rapidly changing properties of CO2 near the critical point. The results of the analyses showed that, for the direct supercritical CO2 power cycle, thermal efficiencies in the range of 40 to 50% can be achieved. For the indirect supercritical CO2 power cycle, thermal efficiencies were approximately 10% lower than those obtained for the direct cycle over the same reactor outlet temperature range.

Edwin A. Harvego; Michael G. McKellar

2011-11-01T23:59:59.000Z

377

Dose reduction and optimization studies (ALARA) at nuclear power facilities. [PWR; BWR  

SciTech Connect (OSTI)

Brookhaven National Laboratory (BNL) has been commissioned by the Nuclear Regulatory Commission (NRC) to study dose-reduction techniques and effectiveness of as low as reasonably achievable (ALARA) planning at LWR plants. These studies have the following objectives: identify high-dose maintenance tasks; identify dose-reduction techniques; examine incentives for dose reduction; evaluate cost-effectiveness and optimization of dose-reduction techniques; and compile an ALARA handbook on data, engineering modifications, cost-effectiveness calculations, and other information of interest to ALARA practioners.

Baum, J.W.; Meinhold, C.B.

1983-01-01T23:59:59.000Z

378

Optimal sizing study of hybrid wind/PV/diesel power generation unit  

SciTech Connect (OSTI)

In this paper, a methodology of sizing optimization of a stand-alone hybrid wind/PV/diesel energy system is presented. This approach makes use of a deterministic algorithm to suggest, among a list of commercially available system devices, the optimal number and type of units ensuring that the total cost of the system is minimized while guaranteeing the availability of the energy. The collection of 6 months of data of wind speed, solar radiation and ambient temperature recorded for every hour of the day were used. The mathematical modeling of the main elements of the hybrid wind/PV/diesel system is exposed showing the more relevant sizing variables. A deterministic algorithm is used to minimize the total cost of the system while guaranteeing the satisfaction of the load demand. A comparison between the total cost of the hybrid wind/PV/diesel energy system with batteries and the hybrid wind/PV/diesel energy system without batteries is presented. The reached results demonstrate the practical utility of the used sizing methodology and show the influence of the battery storage on the total cost of the hybrid system. (author)

Belfkira, Rachid; Zhang, Lu; Barakat, Georges [Groupe de Recherche en Electrotechnique et Automatique du Havre, University of Le Havre, 25 rue Philippe Lebon, BP 1123, 76063 Le Havre (France)

2011-01-15T23:59:59.000Z

379

Fast-wave Power Flow Along SOL Field Lines In NSTX nd The Associated Power Deposition Profile Across The SOL In Front Of The Antenna  

SciTech Connect (OSTI)

Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface (LCFS) as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. Advanced RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.

Perkins, Roy

2013-06-21T23:59:59.000Z

380

Concentration solar power optimization system and method of using the same  

DOE Patents [OSTI]

A system and method for optimizing at least one mirror of at least one CSP system is provided. The system has a screen for displaying light patterns for reflection by the mirror, a camera for receiving a reflection of the light patterns from the mirror, and a solar characterization tool. The solar characterization tool has a characterizing unit for determining at least one mirror parameter of the mirror based on an initial position of the camera and the screen, and a refinement unit for refining the determined parameter(s) based on an adjusted position of the camera and screen whereby the mirror is characterized. The system may also be provided with a solar alignment tool for comparing at least one mirror parameter of the mirror to a design geometry whereby an alignment error is defined, and at least one alignment unit for adjusting the mirror to reduce the alignment error.

Andraka, Charles E

2014-03-18T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Optimizing Technology to Reduce Mercury and Acid Gas Emissions from Electric Power Plants  

SciTech Connect (OSTI)

Revised maps and associated data show potential mercury, sulfur, and chlorine emissions for U.S. coal by county of origin. Existing coal mining and coal washing practices result in a 25% reduction of mercury in U.S. coal before it is delivered to the power plant. Selection of low-mercury coal is a good mercury control option for plants having hot-side ESP, cold-side ESP, or hot-side ESP/FGD emission controls. Chlorine content is more important for plants having cold-side ESP/FGD or SDA/FF controls; optimum net mercury capture is indicated where chlorine is between 500 and 1000 ppm. Selection of low-sulfur coal should improve mercury capture where carbon in fly ash is used to reduce mercury emissions.

Jeffrey C. Quick; David E. Tabet; Sharon Wakefield; Roger L. Bon

2005-01-31T23:59:59.000Z

382

A Flow Level Perspective on Base Station Power Allocation in Green Networks  

E-Print Network [OSTI]

the energy-efficiency of base stations operating in the downlink. The energy-efficiency refers to the amount nature of users (referred to as the global energy-efficiency). We emphasize our numerical results that study the influence of the radio conditions, transmit power and the user traffic on the energy-efficiency

Boyer, Edmond

383

Large amplitude oscillatory shear flow of gluten dough: A model power-law gel  

E-Print Network [OSTI]

In a previous paper [T. S. K. Ng and G. H. McKinley, J. Rheol.52(2), 417449 (2008)], we demonstrated that gluten gels can best be understood as a polymericnetwork with a power-law frequency response that reflects the ...

Ng, Trevor S. K.

384

Sparsity-Promoting Optimal Wide-Area Control of Power Networks Florian Dorfler, Mihailo R. Jovanovic, Michael Chertkov, and Francesco Bullo  

E-Print Network [OSTI]

Sparsity-Promoting Optimal Wide-Area Control of Power Networks Florian D¨orfler, Mihailo R of this document has been presented in [1]. Florian D¨orfler is with the Electrical Engineering Department Santa Barbara, Santa Barbara, CA 93106. Email: dorfler@seas.ucla.edu, mihailo@umn.edu, chertkov

Bullo, Francesco

385

Sparsity-Promoting Optimal Wide-Area Control of Power Networks Florian Dorfler, Mihailo R. Jovanovic, Michael Chertkov, and Francesco Bullo  

E-Print Network [OSTI]

Sparsity-Promoting Optimal Wide-Area Control of Power Networks Florian D¨orfler, Mihailo R of this document has been presented in [1]. Florian D¨orfler and Francesco Bullo are with the Center for Control at LANL and with New Mexico Consortium, Los Alamos, NM 87544. Email: {dorfler

Jovanovic, Mihailo

386

Sparse and Optimal Wide-Area Damping Control in Power Networks Florian Dorfler, Mihailo R. Jovanovic, Michael Chertkov, and Francesco Bullo  

E-Print Network [OSTI]

Sparse and Optimal Wide-Area Damping Control in Power Networks Florian D¨orfler, Mihailo R, and CMMI-09-27720. Florian D¨orfler and Francesco Bullo are with the Center for Control, Dynamical Systems Alamos, NM 87544. Email: {dorfler,bullo}@engineering.ucsb.edu, mihailo@umn.edu, chertkov

Bullo, Francesco

387

Derivative Free Optimization Methods for Optimizing Stirrer ...  

E-Print Network [OSTI]

It also gives a comparison of the two optimization algorithms. Key words: Energy, Numerical Optimization, Derivative-Free Optimization,. Computational Fluid ... numerical simulations are needed for the computation of the fluid flow inside the stirrer for ..... Optimization Methods and Software, 20 (2005) 493-508. [6] A. R. Conn...

2007-02-01T23:59:59.000Z

388

Output-power fluctuations of flowing-gas CO/sub 2/ lasers with unstable resonators  

SciTech Connect (OSTI)

An experimental study was made of the influence of different factors on the stability of the output intensity of a flowing-gas CO/sub 2/ laser with an unstable resonator. The measured amplitude--frequency characteristics of the intensity fluctuation spectrum had resonance peaks at multiples of the frequency corresponding to the transit time of the gas to the optic axis of the resonator. A rise in the efficiency of the laser system was found to be accompanied by an increase in the amplitude of the fluctuations of the radiation intensity.

Artamonov, A.V.; Konev, V.A.; Likhanskii, V.V.; Napartovich, A.P.

1984-06-01T23:59:59.000Z

389

OPTIMIZING TECHNOLOGY TO REDUCE MERCURY AND ACID GAS EMISSIONS FROM ELECTRIC POWER PLANTS  

SciTech Connect (OSTI)

Maps showing potential mercury, sulfur, chlorine, and moisture emissions for U.S. coal by county of origin were made from publicly available data (plates 1, 2, 3, and 4). Published equations that predict mercury capture by emission control technologies used at U.S. coal-fired utilities were applied to average coal quality values for 169 U.S. counties. The results were used to create five maps that show the influence of coal origin on mercury emissions from utility units with: (1) hot-side electrostatic precipitator (hESP), (2) cold-side electrostatic precipitator (cESP), (3) hot-side electrostatic precipitator with wet flue gas desulfurization (hESP/FGD), (4) cold-side electrostatic precipitator with wet flue gas desulfurization (cESP/FGD), and (5) spray-dry adsorption with fabric filter (SDA/FF) emission controls (plates 5, 6, 7, 8, and 9). Net (lower) coal heating values were calculated from measured coal Btu values, and estimated coal moisture and hydrogen values; the net heating values were used to derive mercury emission rates on an electric output basis (plate 10). Results indicate that selection of low-mercury coal is a good mercury control option for plants having hESP, cESP, or hESP/FGD emission controls. Chlorine content is more important for plants having cESP/FGD or SDA/FF controls; optimum mercury capture is indicated where chlorine is between 500 and 1000 ppm. Selection of low-sulfur coal should improve mercury capture where carbon in fly ash is used to reduce mercury emissions. Comparison of in-ground coal quality with the quality of commercially mined coal indicates that existing coal mining and coal washing practice results in a 25% reduction of mercury in U.S. coal before it is delivered to the power plant. Further pre-combustion mercury reductions may be possible, especially for coal from Texas, Ohio, parts of Pennsylvania and much of the western U.S.

Jeffrey C. Quick; David E. Tabet; Sharon Wakefield; Roger L. Bon

2005-10-01T23:59:59.000Z

390

ADJOINT BASED OPTIMAL CONTROL OF PARTIALLY MISCIBLE TWO-PHASE FLOW IN POROUS MEDIA WITH APPLICATIONS TO CO2  

E-Print Network [OSTI]

WITH APPLICATIONS TO CO2 SEQUESTRATION IN UNDERGROUND RESERVOIRS MORITZ SIMON AND MICHAEL ULBRICH Abstract. With the target of optimizing CO2 sequestration in underground reservoirs, we investigate constrained optimal the amount of trapped CO2 in an underground reservoir after a fixed period of CO2 injection, while time

Ulbrich, Michael

391

The Coordinated Control of a Central Air Conditioning System Based on Variable Chilled Water Temperature and Variable Chilled Water Flow  

E-Print Network [OSTI]

At present, regulation of water flow by means of pump frequency conversion is one of the major methods for power-saving in central air conditioning systems. In this article, optimization regulation for central air conditioning system on the basis...

Liu, J.; Mai, Y.; Liu, X.

2006-01-01T23:59:59.000Z

392

Hydropower is one of the oldest power sources on the planet. Flowing water, dire  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:Year in3.pdfEnergy Health andof EnergyHydrogen-Powered Buses Brochure -Energy

393

Modeling, Optimization and Power Efficiency Comparison of High-speed Inter-chip Electrical and Optical Interconnect Architectures in Nanometer CMOS Technologies  

E-Print Network [OSTI]

-bandwidth inter-chip optical interconnect architectures have the potential to address this increasing I/O bandwidth. Considering future tera-scale systems, power dissipation of the high-speed I/O link becomes a significant concern. This work presents a design flow...

Palaniappan, Arun

2012-02-14T23:59:59.000Z

394

System and method for measuring particles in a sample stream of a flow cytometer using a low power laser source  

DOE Patents [OSTI]

A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.

Graves, Steven W; Habbersett, Robert C

2013-10-22T23:59:59.000Z

395

System and method for measuring particles in a sample stream of a flow cytometer using low-power laser source  

DOE Patents [OSTI]

A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.

Graves, Steven W.; Habbersett, Robert C.

2014-07-01T23:59:59.000Z

396

Reliability assessment of electrical power systems using genetic algorithms  

E-Print Network [OSTI]

of the dissertation, a GA based method for state sampling of composite generation-transmission power systems is introduced. Binary encoded GA is used as a state sampling tool for the composite power system network states. A linearized optimization load flow model...

Samaan, Nader Amin Aziz

2004-11-15T23:59:59.000Z

397

March 19, 2008 1 Abstract--In this paper, we continue to analyze optimal  

E-Print Network [OSTI]

optimal power flow (DCOPF) used to dispatch generators to meet load in an efficient manner. We then useMarch 19, 2008 1 Abstract--In this paper, we continue to analyze optimal dispatch of generation the state of the transmission element (line or transformer). Previous research showed a 25% savings

Oren, Shmuel S.

398

Electric Vehicle Charging in Smart Grid: Optimality and Valley-filling Algorithms  

E-Print Network [OSTI]

different settings. Index Terms--Optimal power flow, electric vehicle charging, valley-filling, onlineForReview Only 1 Electric Vehicle Charging in Smart Grid: Optimality and Valley-filling Algorithms, IEEE. Abstract--Electric vehicles (EVs) offer an attractive long-term solution to reduce the dependence

Tan, Chee Wei

399

Optimizing Power Factor Correction  

E-Print Network [OSTI]

has been reversed. The 36 different plots that are given in each Fig. 6 through 8 are for 36 different combinations PB (yr) 1.0 1.1 0.8 0.9 1.0 P F 2 ./ 0.5 -+/::.......----------------'1':7 0.5 PFl 1.0 Dr ? ZIZ Itw. DfB? zz,zzz kWh. B... ? $z,zzz. D ? $zz/kVAR. Figure 3. Payback period contours; upper triangle 1.0 PFI 0.5 ~....L---------------------t-0.5 0.9 '0.8 1.0 P F 2 / ./ 1.0 1.1 PB (yr) Figure 4. Payback period contours; lower triangle 811 ESL-IE-86...

Phillips, R. K.; Burmeister, L. C.

400

Optimization Online - Multistage Adaptive Robust Optimization for ...  

E-Print Network [OSTI]

Sep 5, 2014 ... ... with the increasing penetration of wind and solar power generation has ... Keywords: Electric energy systems, multistage robust optimization, ... Multistage Adaptive Robust Optimization for the Unit Commitment Problem.

Alvaro Lorca

2014-09-05T23:59:59.000Z

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


401

Optimizing performance of ceramic pot filters in Northern Ghana and modeling flow through paraboloid-shaped filters/  

E-Print Network [OSTI]

This work aimed to inform the design of ceramic pot filters to be manufactured by the organization Pure Home Water (PHW) in Northern Ghana, and to model the flow through an innovative paraboloid-shaped ceramic pot filter. ...

Miller, Travis Reed

2010-01-01T23:59:59.000Z

402

OPTIMIZATION AND DESIGN GUIDELINES FOR HIGH FLUX MICRO-CHANNEL HEAT SINKS FOR LIQUID AND GASEOUS SINGLE-PHASE FLOW  

E-Print Network [OSTI]

forced convection micro-channel heat sinks for minimum pump power at high heat fluxes. Results gained orders of magnitude, especially for high heat flux devices. Using water and air as coolants, designs for heat fluxes of >10 kW/cm2 and >100 W/cm2 respectively with pump/fan power expenses less than 1

Müller, Norbert

403

Characterization of Limiting Factors in Laminar Flow-Based Membraneless Microfuel Cells  

E-Print Network [OSTI]

are underway to develop and optimize microscale fuel cells as high-energy-density power source alternatives, where fuel and oxidant are oxidized and re- duced, respectively, is essential for fuel cell optimization reports the analysis of a microflu- idic fuel cell based on laminar flow using an external reference

Kenis, Paul J. A.

404

Stocks and Flows of U and Pu in a World with 3.6 TWe of Nuclear Power  

SciTech Connect (OSTI)

Integrated energy, environment, and economics models project that worldwide electrical energy use will increase to ?12 TWe in 2100 and nuclear power may be required to provide 3.6 TWe at this time. If pulverized coal without carbon sequestration were employed instead, the resulting incremental long-term global temperature rise would be about 2/3 deg C. Calculations are presented of the stocks and flows of uranium and plutonium associated with the scenario where this energy is provided by nuclear power. If only light-water reactors (LWRs) are used, the scenario consumes about 33.4 Mt of mined uranium. Continuing to operate the reactors in place in 2100 through the end of their assumed 60 year lifetime raises this to 59 Mt, 4.7x the NEA/ IAEA Redbook estimate for total discovered + undiscovered uranium. The waste corresponds to about 86x the legally defined capacity of Yucca Mtn. A case is also considered where a transition is begun to fast-spectrum reactors in 2040, both for a balanced system of LWRs and transuranic (TRU) burners with conversion ration (CR) = 0.5, and for a system of breeders. In the latter case we find that CR = 1.21 is adequate to replace all LWRs with breeders by 2100, using solely TRU from LWRs to start up the reactors assuming reprocessed fuel is available for use two years after its removal from the reactor. The stock of plutonium circulating in the fast reactor system in 2100 is comparable to that which would have been buried in the LWR-only case. One year of fueling corresponds to 2,000 6,000t of Pu. Fusion energy, if first brought on line in mid-century, could in principle replace fast reactors in this scenario.

Robert J. Goldston

2012-08-10T23:59:59.000Z

405

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 27, NO. 3, AUGUST 2012 1521 Optimal Placement of Phasor Measurement  

E-Print Network [OSTI]

estimation is at the core of grid monitoring, PMU deployment is optimized here based on estimation-theoretic criteria. Considering both voltage and incident current readings per PMU-instrumented bus and incorporating conventionally derived state estimates under the Bayesian framework, PMU placement is formulated as an optimal

Giannakis, Georgios

406

Optimization Online Digest -- February 2013  

E-Print Network [OSTI]

Principle of optimal accuracy classification for metrological purposes ... Optimal Power Grid Protection through A Defender-Attacker-Defender Model Wei Yuan...

407

IEEE PES WM Panel on Modeling, Simulation and Applications of FACTS Controllers in Angle and Voltage Stability Studies, Singapore, Jan. 2000 Power Flow and Transient Stability Models of FACTS Controllers  

E-Print Network [OSTI]

, the Static Syn- chronous Source Series Compensator SSSC, and the Uni edPower FlowController UPFC appropriateIEEE PES WM Panel on Modeling, Simulation and Applications of FACTS Controllers in Angle and Voltage Stability Studies, Singapore, Jan. 2000 Power Flow and Transient Stability Models of FACTS

Cañizares, Claudio A.

408

52 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 28, NO. 1, FEBRUARY 2013 Adaptive Robust Optimization for the Security  

E-Print Network [OSTI]

generation resources such as wind power and price responsive demand. To meet these challenges, we propose power, solar power, and distributed gen- erators) and more price-responsive demand participation have challenges as the supply and demand uncertainty increases dramatically due to the integration of variable

Bertsimas, Dimitris

409

Abstract--The socially optimal power market clearing problem with diverse, complex-utility-structure participants at  

E-Print Network [OSTI]

capabilities in today's cyber-enabled smart power grid, and the promise of distributed generation, demand generation volatility, have peaked interest in distribution network power markets [1,8]. In [1], we commercial and residential loads. Both feeders have distributed PV generation with power electronics

Caramanis, Michael

410

ACCEPTED TO IEEE TRANS. POWER SYSTEMS, APRIL 2011. 1 Abstract In this paper, an optimization model and techniques  

E-Print Network [OSTI]

and tools. Index Terms Power system planning, renewable energy generation, solar photovoltaic, investment and sustainable sources of energy. Among them, wind and solar generation have become preeminent in recent years [$] , Monthly average power from solar PV module [kW] Rated power of a typical solar PV module [kW] This work

Caizares, Claudio A.

411

The characterization of flow regimes with power spectral density distributions of pressure fluctuations during condensation in smooth and micro-fin tubes  

SciTech Connect (OSTI)

This paper presents an objective predictor of the prevailing flow regime during refrigerant condensation inside smooth-, micro-fin and herringbone tubes. The power spectral density (PSD) distribution of the fluctuating condensing pressure signal was used to predict the prevailing flow regime, as opposed to the traditional (and subjective) use of visual-only methods, and/or smooth-tube flow regime maps. The prevailing flow regime was observed by using digital cameras and was validated with the use of the conventional smooth-tube flow regime transition criteria, Froude rate criteria, as well as a new flow regime map that was developed for micro-fin tube condensation. Experimental work was conducted for condensing R-22, R-407C, and R-134a at an average saturation temperature of 40{sup o}C with mass fluxes ranging from 300 to 800kg/m{sup 2}s, and with vapour qualities ranging from 0.85-0.95 at condenser inlet to 0.05-0.15 at condenser outlet. Tests were conducted with one smooth-tube condenser and three micro-fin tube condensers (with helix angles of 10{sup o}, 18{sup o}, and 37{sup o}, respectively). It is shown that the micro-fin tubes cause a delay in the transition from annular to intermittent flow by at least 19% (compared to the smooth tube), thus significantly contributing to the enhancement of heat transfer. (author)

Liebenberg, Leon; Meyer, Josua P. [Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002 (South Africa)

2006-11-15T23:59:59.000Z

412

Optimization Online - Stochastic Optimization Approach to Water ...  

E-Print Network [OSTI]

Mar 18, 2012 ... The approach determines optimal set-points to maximize power output in the ... black-box simulation models and to construct empirical distributions from ... In a pulverized coal power plant study we have found that weather...

Juan M. Salazar

2012-03-18T23:59:59.000Z

413

Thickness distribution of a cooling pyroclastic flow deposit on Augustine Volcano, Alaska: Optimization using InSAR,  

E-Print Network [OSTI]

Thickness distribution of a cooling pyroclastic flow deposit on Augustine Volcano, Alaska of Volcanology and Geothermal Research 150 (2006) 186­201 www.elsevier.com/locate/jvolgeores #12;imagery have al., 2001), poroelastic rebound (Peltzer et al., 1996), cooling lava (Stevens et al., 2001

414

Copyright 2004 IEEE. Published in the Proceedings of the 36th Annual North American Power Symposium, August 9-10 2004, University of Idaho, Moscow, Idaho Abstract--This paper explores a mathematical method for  

E-Print Network [OSTI]

for detecting groups of generators in an electric power system that have the potential to benefit from explores a mathematical method for detecting groups of generators in an electric power system that have the matrices can provide metrics for market power. Index Terms--Optimal power flow, electricity markets, market

415

Coordinated Control and Optimization of Virtual Power Plants for Energy and Frequency Regulation Services in Electricity Markets.  

E-Print Network [OSTI]

??With increasing penetration of intermittent resources such as wind and solar, power system operations are facing much more challenges in cost effective provision of energy (more)

Zhang, Fan

2012-01-01T23:59:59.000Z

416

Abstract Reactive Power Compensation in Electric Systems is usually studied as a constrained Single-objective Optimization  

E-Print Network [OSTI]

Abstract Reactive Power Compensation in Electric Systems is usually studied as a constrained of calculation, better defined Pareto Front and a larger number of Pareto solutions. Index Terms Reactive Power.mail: {bbaran, jvallejo, rramos}@cnc.una.py). U. Fernández is with the National Electricity Administration

Coello, Carlos A. Coello

417

OPTIMAL EFFICIENCY-POWER TRADEOFF FOR AN AIR MOTOR/COMPRESSOR WITH VOLUME VARYING HEAT TRANSFER CAPABILITY  

E-Print Network [OSTI]

of air. These results could ben- efit applications such as compressed air energy storage where both high and expansion is both energy efficient and power-dense. An ex- ample would be compressed air energy storage. One density of compressed air storage (about 20 times greater than hydraulic accumulators), and the high power

Li, Perry Y.

418

Optimization Online Digest -- February 2011  

E-Print Network [OSTI]

Stochastic Optimization for Power System Configuration with Renewable Energy in Remote Areas Ludwig Kuznia, Bo Zeng, Grisselle Centeno, Zhixin Miao

419

MULTIPARAMETER OPTIMIZATION STUDIES ON GEOTHERMAL ENERGY CYCLES  

E-Print Network [OSTI]

of Practical Cycles for Geothermal Power Plants." GeneralDesign and Optimize Geothermal Power Cycles." Presented atof Practical Cycles for Geothermal Power Plants." General

Pope, W.L.

2011-01-01T23:59:59.000Z

420

Performance Optimization of Battery-Super Capacitor Hybrid System Electrochemical capacitors (ultracapacitors) offer high power density when compared to battery  

E-Print Network [OSTI]

Performance Optimization of Battery-Super Capacitor Hybrid System Electrochemical capacitors of super capacitors with batteries and fuel cells under specific loads. Despite the fact that Lithium density compared to conventional capacitors. In the late nineties they have gained considerable attention

Popov, Branko N.

Note: This page contains sample records for the topic "optimal power flow" 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

Analysis and optimization of the Graz cycle : a coal fired power generation scheme with near-zero carbon dioxide emissions  

E-Print Network [OSTI]

Humans are releasing record amounts of carbon dioxide into the atmosphere through the combustion of fossil fuels in power generation plants. With mounting evidence that this carbon dioxide is a leading cause of global ...

Alexander, Brentan R

2007-01-01T23:59:59.000Z

422

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 29, NO. 5, SEPTEMBER 2014 2281 Sparsity-Promoting Optimal Wide-Area  

E-Print Network [OSTI]

Wide-Area Control of Power Networks Florian Dörfler, Member, IEEE, Mihailo R. Jovanovi, Senior Member Engineering Department, University of Cal- ifornia Los Angeles, Los Angeles, CA 90095 USA (e-mail: dorfler

Jovanovic, Mihailo

423

Optimal design and control strategies for novel combined heat and power (CHP) fuel cell systems. Part I of II, datum design conditions and approach.  

SciTech Connect (OSTI)

Energy network optimization (ENO) models identify new strategies for designing, installing, and controlling stationary combined heat and power (CHP) fuel cell systems (FCSs) with the goals of (1) minimizing electricity and heating costs for building owners and (2) reducing emissions of the primary greenhouse gas (GHG) - carbon dioxide (CO{sub 2}). A goal of this work is to employ relatively inexpensive simulation studies to discover more financially and environmentally effective approaches for installing CHP FCSs. ENO models quantify the impact of different choices made by power generation operators, FCS manufacturers, building owners, and governments with respect to two primary goals - energy cost savings for building owners and CO{sub 2} emission reductions. These types of models are crucial for identifying cost and CO{sub 2} optima for particular installations. Optimal strategies change with varying economic and environmental conditions, FCS performance, the characteristics of building demand for electricity and heat, and many other factors. ENO models evaluate both 'business-as-usual' and novel FCS operating strategies. For the scenarios examined here, relative to a base case of no FCSs installed, model results indicate that novel strategies could reduce building energy costs by 25% and CO{sub 2} emissions by 80%. Part I of II articles discusses model assumptions and methodology. Part II of II articles illustrates model results for a university campus town and generalizes these results for diverse communities.

Colella, Whitney G.

2010-06-01T23:59:59.000Z

424

Control of power characteristics of ion flow in plasma-etching reactor based on beam-plasma discharge  

SciTech Connect (OSTI)

It is shown that on the basis of the earlier revealed effect of generating the ion flow in the beam-plasma discharge from the discharge axis, a plasma processing reactor can be created for low-energy etching of semiconductor structures. The possibility of easily controlling the density and energy of ion flow by means of varying the potential of the discharge collector is demonstrated. The charge compensation of the ion flow incident on the nonconducting surface is implemented using the modulation of the potential of the substrate holder as well as the plasma-potential modulation.

Isaev, N. V.; Klykov, I. L.; Shustin, E. G., E-mail: shustin@ms.ire.rssi.ru [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Fryazino Branch) (Russian Federation)

2011-12-15T23:59:59.000Z

425

Marine Hydrokinetic Turbine Power-Take-Off Design for Optimal Performance and Low Impact on Cost-of-Energy: Preprint  

SciTech Connect (OSTI)

Marine hydrokinetic devices are becoming a popular method for generating marine renewable energy worldwide. These devices generate electricity by converting the kinetic energy of moving water, wave motion or currents, into electrical energy through the use of a Power-Take-Off (PTO) system. Most PTO systems incorporate a mechanical or hydraulic drive train, power generator and electric control/conditioning system to deliver the generated electric power to the grid at the required state. Like wind turbine applications, the PTO system must be designed for high reliability, good efficiency, and long service life with reasonable maintenance requirements, low cost and an appropriate mechanical design for anticipated applied steady and unsteady loads. The ultimate goal of a PTO design is high efficiency, low maintenance and cost with a low impact on the device Cost-of-Energy (CoE).

Beam, M.; Kline, B.; Elbing, B.; Straka, W.; Fontaine, A.; Lawson, M.; Li, Y.; Thresher, R.; Previsic, M.

2012-04-01T23:59:59.000Z

426

Marine Hydrokinetic Turbine Power-Take-Off Design for Optimal Performance and Low Impact on Cost-of-Energy: Preprint  

SciTech Connect (OSTI)

Marine hydrokinetic devices are becoming a popular method for generating marine renewable energy worldwide. These devices generate electricity by converting the kinetic energy of moving water, wave motion or currents, into electrical energy through the use of a power-take-off (PTO) system. Most PTO systems incorporate a mechanical or hydraulic drivetrain, power generator, and electric control/conditioning system to deliver the generated electric power to the grid at the required state. Like wind turbine applications, the PTO system must be designed for high reliability, good efficiency, and long service life with reasonable maintenance requirements, low cost, and an appropriate mechanical design for anticipated applied steady and unsteady loads. The ultimate goal of a PTO design is high efficiency and low maintenance and cost, with a low impact on the device cost-of-energy (CoE).

Beam, M.; Kline, B.; Elbing, B.; Straka, W.; Fontaine, A.; Lawson, M.; Li, Y.; Thresher, R.; Previsic, M.

2013-02-01T23:59:59.000Z

427

Reliability and optimization studies of nuclear and solar powered systems utilizing a Stirling engine for the space station  

E-Print Network [OSTI]

. A separate radiator cooling loop operating at temperatures around 200oC accomplishes this. Application of a FPSE to space power requires that each of the engine modules must be dynamically self-balanced. The dual opposed engine using a common.... The SP-100 reactor system is a fast neutron spectrum, liquid metal cooled core with a thermoelectric power conversion unit. The reference flight system design is for 100 kWe output while the components are scalable from 10 to 1000 kWe. Because the SP...

Schmitz, Paul Charles

1990-01-01T23:59:59.000Z

428

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 1, FEBRUARY 2001 111 Reliability and Costs Optimization for Distribution  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 1, FEBRUARY 2001 111 Reliability and Costs methodology, using an evolutionary algorithm, for finding out the best distribution network reliability while been used. The proposed methodology has been tested intensively for distribution systems

Coello, Carlos A. Coello

429

206 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 1, JANUARY 2008 The Current Sharing Optimization of Paralleled  

E-Print Network [OSTI]

, Cambridge University, Cam- bridge, U.K. CB2 1PZ. W. T. Ng and F. Dawson are with the Department. Waind are with Dynex Semiconductor, Lincoln LN6 3LF U.K.. Color versions of one or more of the figures.909182 I. INTRODUCTION IN THE next generation, high-power modules will contain a number of semiconductor

Ng, Wai Tung

430

IEEE TRANSACTIONS ON POWER SYSTEMS VOL. 19, NO. 1, FEBRUARY 2004 693 Power Flow (SCORPF) procedure should be recommended for the  

E-Print Network [OSTI]

] to maintain adequate reactive reserves for additional transactions but also the traditional min- imization, on the possible pricing of the reactive support at operation level and on an efficient allocation of new reactive of reactive power support costs (paying attention also to the nondomi- nant terms). REFERENCES [1] G. Gross, S

Gross, George

431

1462 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 26, NO. 3, AUGUST 2011 A Self-Organizing Strategy for Power Flow Control  

E-Print Network [OSTI]

con- trol algorithm that will regulate the power output of multiple pho- tovoltaic generators (PVs) in a distribution network. To this end, the cooperative control methodology from network control theory is used-00267-2010. H. Xin is with the Department of Electrical Engineering, Zhejiang University, Hangzhou

Qu, Zhihua

432

Process Flow Chart for Immobilizing of Radioactive High Concentration Sodium Hydroxide Product from the Sodium Processing Facility at the BN-350 Nuclear power plant in Aktau, Kazakhstan  

SciTech Connect (OSTI)

This paper describes the results of a joint research investigations carried out by the group of Kazakhstan, British and American specialists in development of a new material for immobilization of radioactive 35% sodium hydroxide solutions from the sodium coolant processing facility of the BN-350 nuclear power plant. The resulting solid matrix product, termed geo-cement stone, is capable of isolating long lived radionuclides from the environment. The physico-mechanical properties of geo-cement stone have been investigated and the flow chart for its production verified in a full scale experiments. (author)

Burkitbayev, M.; Omarova, K.; Tolebayev, T. [Ai-Farabi Kazakh National University, Chemical Faculty, Republic of Kazakhstan (Kazakhstan); Galkin, A. [KATEP Ltd., Republic of Kazakhstan (Kazakhstan); Bachilova, N. [NIISTROMPROEKT Ltd., Republic of Kazakhstan (Kazakhstan); Blynskiy, A. [Nuclear Technology Safety Centre, Republic of Kazakhstan (Kazakhstan); Maev, V. [MAEK-Kazatomprom Ltd., Republic of Kazakhstan (Kazakhstan); Wells, D. [NUKEM Limited- a member of the Freyssinet Group, Winfrith Technology Centre, Dorchester, Dorset (United Kingdom); Herrick, A. [NUKEM Limited- a member of the Freyssinet Group, Caithness (United Kingdom); Michelbacher, J. [Idaho National Laboratory, Idaho Falls (United States)

2008-07-01T23:59:59.000Z

433

Study of Power Converter Topologies with Energy Recovery and grid power flow control. Part A: 2-quadrant converter with energy storage.  

E-Print Network [OSTI]

In the framework of a Transfer line (TT2) Consolidation Programme, a number of studies on Energy cycling have been commissioned. Part of this work involves the study of different power electronic system topologies for magnet energy recovery [1{5]. In this report, the use of a two-quadrant (2Q) regulator connected to the DC link of a 4-quadrant magnet supply is analysed. The key objective of the study is to find control strategies that result in the control of the peak power required from the power network as well as to recover the magnet energy into capacitor banks with controlled voltage fluctuation. The study comprises the modelling of the system by means of the method of state averaging and the development of regulation strategies to energy management. The proposed control strategies can be divided in two groups: in the first group, the magnet current is used to dene the reference for the control system, while in the second group this current is considered as a perturbation and some strategies are devised ...

Maestri, S; Uicich, G; Benedetti, M; Le Godec, G; Papastergiou, K

2015-01-01T23:59:59.000Z

434

Flow Accelerated Erosion-Corrosion (FAC) considerations for secondary side piping in the AP1000{sup R} nuclear power plant design  

SciTech Connect (OSTI)

The issue of Flow Accelerated Erosion-Corrosion (FAC) in power plant piping is a known phenomenon that has resulted in material replacements and plant accidents in operating power plants. Therefore, it is important for FAC resistance to be considered in the design of new nuclear power plants. This paper describes the design considerations related to FAC that were used to develop a safe and robust AP1000{sup R} plant secondary side piping design. The primary FAC influencing factors include: - Fluid Temperature - Pipe Geometry/layout - Fluid Chemistry - Fluid Velocity - Pipe Material Composition - Moisture Content (in steam lines) Due to the unknowns related to the relative impact of the influencing factors and the complexities of the interactions between these factors, it is difficult to accurately predict the expected wear rate in a given piping segment in a new plant. This paper provides: - a description of FAC and the factors that influence the FAC degradation rate, - an assessment of the level of FAC resistance of AP1000{sup R} secondary side system piping, - an explanation of options to increase FAC resistance and associated benefits/cost, - discussion of development of a tool for predicting FAC degradation rate in new nuclear power plants. (authors)

Vanderhoff, J. F.; Rao, G. V. [Westinghouse Electric Company LLC, 1000 Westinghouse Drive, Cranberry Township, PA 16066 (United States); Stein, A. [Shaw Power Nuclear, 1000 Technology Center Drive, Stoughton, MA 02072 (United States)

2012-07-01T23:59:59.000Z

435

Optimizing performance of energy systems  

SciTech Connect (OSTI)

This book discusses optimizing performance of energy systems. Topics covered include a test station, heat flow integrator, microcomputer control of MIMIC operation, and microcomputer control of simulation operation.

Stricker, S.

1985-01-01T23:59:59.000Z

436

Optimization Online - All Areas Submissions - February 2013  

E-Print Network [OSTI]

Principle of optimal accuracy classification for metrological purposes ... Optimal Power Grid Protection through A Defender-Attacker-Defender Model Wei Yuan...

437

952 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 24, NO. 4, APRIL 2009 A System Design Approach for Unattended Solar  

E-Print Network [OSTI]

tolerance, and energy flow control capability. Maximum power point tracking is used to optimize solar panel versus solar panel size for a given availability. The solar panel supplies energy through a power for Unattended Solar Energy Harvesting Supply Jonathan W. Kimball, Senior Member, IEEE, Brian T. Kuhn, Senior

Kimball, Jonathan W.

438

Euler's fluid equations: Optimal Control vs Optimization  

E-Print Network [OSTI]

An optimization method used in image-processing (metamorphosis) is found to imply Euler's equations for incompressible flow of an inviscid fluid, without requiring that the Lagrangian particle labels exactly follow the flow lines of the Eulerian velocity vector field. Thus, an optimal control problem and an optimization problem for incompressible ideal fluid flow both yield the \\emph {same} Euler fluid equations, although their Lagrangian parcel dynamics are \\emph{different}. This is a result of the \\emph{gauge freedom} in the definition of the fluid pressure for an incompressible flow, in combination with the symmetry of fluid dynamics under relabeling of their Lagrangian coordinates. Similar ideas are also illustrated for SO(N) rigid body motion.

Darryl D. Holm

2009-09-28T23:59:59.000Z

439

International Journal of Electrical and Computer Engineering 3:10 2008 Optimal Power Allocation for the Proposed Asymmetric Turbo Code for 3G Systems  

E-Print Network [OSTI]

AbstractWe proposed a new class of asymmetric turbo encoder for 3G systems that performs well in both water fall and error floor regions in [7]. In this paper, a modified (optimal) power allocation scheme for the different bits of new class of asymmetric turbo encoder has been investigated to enhance the performance. The simulation results and performance bound for proposed asymmetric turbo code with modified Unequal Power Allocation (UPA) scheme for the frame length, N=400, code rate, r=1/3 with Log-MAP decoder over Additive White Gaussian Noise (AWGN) channel are obtained and compared with the system with typical UPA and without UPA. The performance tests are extended over AWGN channel for different frame size to verify the possibility of implementation of the modified UPA scheme for the proposed asymmetric turbo code. From the performance results, it is observed that the proposed asymmetric turbo code with modified UPA performs better than the system without UPA and with typical UPA and it provides a coding gain of 0.4 to 0.52dB. KeywordsAsymmetric turbo code, Generator polynomial, Interleaver, UPA, WCDMA, cdma2000. I.

K. Ramasamy; B. Balamuralithara; Mohammad Umar Siddiqi

440

Optimal design and control strategies for novel combined heat and power (CHP) fuel cell systems. Part II of II, case study results.  

SciTech Connect (OSTI)

Innovative energy system optimization models are deployed to evaluate novel fuel cell system (FCS) operating strategies, not typically pursued by commercial industry. Most FCS today are installed according to a 'business-as-usual' approach: (1) stand-alone (unconnected to district heating networks and low-voltage electricity distribution lines), (2) not load following (not producing output equivalent to the instantaneous electrical or thermal demand of surrounding buildings), (3) employing a fairly fixed heat-to-power ratio (producing heat and electricity in a relatively constant ratio to each other), and (4) producing only electricity and no recoverable heat. By contrast, models discussed here consider novel approaches as well. Novel approaches include (1) networking (connecting FCSs to electrical and/or thermal networks), (2) load following (having FCSs produce only the instantaneous electricity or heat demanded by surrounding buildings), (3) employing a variable heat-to-power ratio (such that FCS can vary the ratio of heat and electricity they produce), (4) co-generation (combining the production of electricity and recoverable heat), (5) permutations of these together, and (6) permutations of these combined with more 'business-as-usual' approaches. The detailed assumptions and methods behind these models are described in Part I of this article pair.

Colella, Whitney G.

2010-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Constrained Graph Optimization: Interdiction and Preservation Problems  

SciTech Connect (OSTI)

The maximum flow, shortest path, and maximum matching problems are a set of basic graph problems that are critical in theoretical computer science and applications. Constrained graph optimization, a variation of these basic graph problems involving modification of the underlying graph, is equally important but sometimes significantly harder. In particular, one can explore these optimization problems with additional cost constraints. In the preservation case, the optimizer has a budget to preserve vertices or edges of a graph, preventing them from being deleted. The optimizer wants to find the best set of preserved edges/vertices in which the cost constraints are satisfied and the basic graph problems are optimized. For example, in shortest path preservation, the optimizer wants to find a set of edges/vertices within which the shortest path between two predetermined points is smallest. In interdiction problems, one deletes vertices or edges from the graph with a particular cost in order to impede the basic graph problems as much as possible (for example, delete edges/vertices to maximize the shortest path between two predetermined vertices). Applications of preservation problems include optimal road maintenance, power grid maintenance, and job scheduling, while interdiction problems are related to drug trafficking prevention, network stability assessment, and counterterrorism. Computational hardness results are presented, along with heuristic methods for approximating solutions to the matching interdiction problem. Also, efficient algorithms are presented for special cases of graphs, including on planar graphs. The graphs in many of the listed applications are planar, so these algorithms have important practical implications.

Schild, Aaron V [Los Alamos National Laboratory

2012-07-30T23:59:59.000Z

442

User's guide for the BNW-III optimization code for modular dry/wet-cooled power plants  

SciTech Connect (OSTI)

This user's guide describes BNW-III, a computer code developed by the Pacific Northwest Laboratory (PNL) as part of the Dry Cooling Enhancement Program sponsored by the US Department of Energy (DOE). The BNW-III code models a modular dry/wet cooling system for a nuclear or fossil fuel power plant. The purpose of this guide is to give the code user a brief description of what the BNW-III code is and how to use it. It describes the cooling system being modeled and the various models used. A detailed description of code input and code output is also included. The BNW-III code was developed to analyze a specific cooling system layout. However, there is a large degree of freedom in the type of cooling modules that can be selected and in the performance of those modules. The costs of the modules are input to the code, giving the user a great deal of flexibility.

Braun, D.J.; Faletti, D.W.

1984-09-01T23:59:59.000Z

443

The power tool  

SciTech Connect (OSTI)

POWER Tool--Planning, Optimization, Waste Estimating and Resourcing tool, a hand-held field estimating unit and relational database software tool for optimizing disassembly and final waste form of contaminated systems and equipment.

HAYFIELD, J.P.

1999-02-01T23:59:59.000Z

444

Optimized Solvent for Energy-Efficient, Environmentally-Friendly Capture of CO{sub 2} at Coal-Fired Power Plants  

SciTech Connect (OSTI)

The overall goal of this project, as originally proposed, was to optimize the formulation of a novel solvent as a critical enabler for the cost-effective, energy-efficient, environmentally-friendly capture of CO{sub 2} at coal-fired utility plants. Aqueous blends of concentrated piperazine (PZ) with other compounds had been shown to exhibit high rates of CO{sub 2} absorption, low regeneration energy, and other desirable performance characteristics during an earlier 5-year development program conducted by B&W. The specific objective of this project was to identify PZ-based solvent formulations that globally optimize the performance of coal-fired power plants equipped with CO{sub 2} scrubbing systems. While previous solvent development studies have tended to focus on energy consumption and absorber size, important issues to be sure, the current work seeks to explore, understand, and optimize solvent formulation across the full gamut of issues related to commercial application of the technology: capital and operating costs, operability, reliability, environmental, health and safety (EH&S), etc. Work on the project was intended to be performed under four budget periods. The objective of the work in the first budget period has been to identify several candidate formulations of a concentrated PZ-based solvent for detailed characterization and evaluation. Work in the second budget period would generate reliable and comprehensive property and performance data for the identified formulations. Work in the third budget period would quantify the expected performance of the selected formulations in a commercial CO{sub 2} scrubbing process. Finally, work in the fourth budget period would provide a final technology feasibility study and a preliminary technology EH&S assessment. Due to other business priorities, however, B&W has requested that this project be terminated at the end of the first budget period. This document therefore serves as the final report for this project. It is the first volume of the two-volume final report and summarizes Budget Period 1 accomplishments under Tasks 1-5 of the project, including the selection of four solvent formulations for further study.

Farthing, G. A.; Rimpf, L. M.

2014-04-30T23:59:59.000Z

445

Genetic optimization of two-material composite laminates Laurent Grosset  

E-Print Network [OSTI]

the power of GAs for this application. COMPOSITE LAMINATE DESIGN Composite laminate optimization typically

Coello, Carlos A. Coello

446

Gasification CFD Modeling for Advanced Power Plant Simulations  

SciTech Connect (OSTI)

In this paper we have described recent progress on developing CFD models for two commercial-scale gasifiers, including a two-stage, coal slurry-fed, oxygen-blown, pressurized, entrained-flow gasifier and a scaled-up design of the PSDF transport gasifier. Also highlighted was NETLs Advanced Process Engineering Co-Simulator for coupling high-fidelity equipment models with process simulation for the design, analysis, and optimization of advanced power plants. Using APECS, we have coupled the entrained-flow gasifier CFD model into a coal-fired, gasification-based FutureGen power and hydrogen production plant. The results for the FutureGen co-simulation illustrate how the APECS technology can help engineers better understand and optimize gasifier fluid dynamics and related phenomena that impact overall power plant performance.

Zitney, S.E.; Guenther, C.P.

2005-09-01T23:59:59.000Z

447

Optimization Online - All Areas Submissions - February 2011  

E-Print Network [OSTI]

Stochastic Optimization for Power System Configuration with Renewable Energy in Remote Areas Ludwig Kuznia, Bo Zeng, Grisselle Centeno, Zhixin Miao.

448

RESEARCH ARTICLE Effectiveness of pulse flows in a regulated river for inducing  

E-Print Network [OSTI]

) in a reach of the Puntledge River where water is diverted for power generation, resulting in stable low flows (i.e., turbine out flows), and/or the presence of non-optimal environmental conditions (i.e., cold, Courtenay, BC V9N 2Z5, Canada B. Mossop BC Hydro, 6911 Southpoint Drive, Burnaby, BC V3N 4X8, Canada S. G

Hinch, Scott G.

449

Proceedings of the XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference, Edinburgh, UK 25-30 August 1996, SPIE Vol. 3092, ed. H.J. Baker, pp. 758-763 (1997).  

E-Print Network [OSTI]

Proceedings of the XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser of 20 mm were obtained in aluminum and 41 mm in carbon steel using an N2 gas assist and 5-6 kW of power study of cutting thick aluminum and steel with a chemical oxygen-iodine laser using an N2 or O2 gas

Carroll, David L.

450

Energy Harvesting Optimization  

E-Print Network [OSTI]

Energy Harvesting Optimization Power Systems Analysis Final Project into energy harvesting techniques about two decade ago as a valuable way to satisfy those new demands. Energy harvesting derives energy from the ambient environment

Lavaei, Javad

451

Online Supplement Appendix Flow Anatomy of the TCPC Pathways  

E-Print Network [OSTI]

narrowings that dissipate little power at baseline flows may be sources of significant power loss at increased flows, 2) flow collision between SVC and IVC flows can be a significant source of power loss and usually increases significantly with increasing power loss, 3) increased skewing of the IVC flow toward

Pekkan, Kerem

452

Electric Power System Asset Optimization  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed NewcatalystNeutronEnvironmentZIRKLEEFFECTS OFElaineElectric Grid -Analysis430/061110

453

Cooling Flows or Heating Flows?  

E-Print Network [OSTI]

It is now clear that AGN heat cooling flows, largely by driving winds. The winds may contain a relativistic component that generates powerful synchrotron radiation, but it is not clear that all winds do so. The spatial and temporal stability of the AGN/cooling flow interaction are discussed. Collimation of the winds probably provides spatial stability. Temporal stability may be possible only for black holes with masses above a critical value. Both the failure of cooling flows to have adiabatic cores and the existence of X-ray cavities confirm the importance of collimated outflows. I quantify the scale of the convective flow that the AGN Hydra would need to drive if it balanced radiative inward flow by outward flow parallel to the jets. At least in Virgo any such flow must be confined to r<~20 kpc. Hydrodynamical simulations suggest that AGN outbursts cannot last longer than ~25 Myr. Data for four clusters with well studied X-ray cavities suggests that heating associated with cavity formation approximately balances radiative cooling. The role of cosmic infall and the mechanism of filament formation are briefly touched on.

James Binney

2003-10-08T23:59:59.000Z

454

Optimization Online  

E-Print Network [OSTI]

Optimization Online is a repository of e-prints about optimization and related topics. Submissions to Optimization Online are moderated by a team of volunteer

455

Energy 101: Hydroelectric Power  

Office of Energy Efficiency and Renewable Energy (EERE)

Learn how hydroelectric power, or hydropower, captures the kinetic energy of flowing water and turns it into electricity for our homes and businesses.

456

Reactive Power Compensation Based on FACTs Devices Xunchi Wu (xw2256) Power Systems Analysis Final Project  

E-Print Network [OSTI]

..........................................................................................5 2.1 The Thyristor Controlled Reactor (TCR)......................................................................8 III. Power Flow Calculation

Lavaei, Javad

457

Control and optimization system  

DOE Patents [OSTI]

A system for optimizing a power plant includes a chemical loop having an input for receiving an input parameter (270) and an output for outputting an output parameter (280), a control system operably connected to the chemical loop and having a multiple controller part (230) comprising a model-free controller. The control system receives the output parameter (280), optimizes the input parameter (270) based on the received output parameter (280), and outputs an optimized input parameter (270) to the input of the chemical loop to control a process of the chemical loop in an optimized manner.

Xinsheng, Lou

2013-02-12T23:59:59.000Z

458

E-Print Network 3.0 - activity optimization method Sample Search...  

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

optimization method Search Powered by Explorit Topic List Advanced Search Sample search results for: activity optimization method Page: << < 1 2 3 4 5 > >> 1 Optimization 1-1...

459

A Survey of Optimization Research at Sandia National Laboratories  

E-Print Network [OSTI]

, M. Eldred, R. Hogan Optimization of CVD Reactor Design using Parallel Reacting Flow Simulation. A; Optimization of CVD Reactor Design using Parallel Reacting Flow Simulation. A. Salinger, S. Hutchinson, W. Hart to simulate a CVD reactor; use DAKOTA to perfom optimization with the inlet concentra­ tion, inlet flow rate

Neumaier, Arnold

460

Regenerative Heater Optimization for Steam Turbo-Generation Cycles of Generation IV Nuclear Power Plants with a Comparison of Two Concepts for the Westinghouse International Reactor Innovative and Secure (IRIS)  

SciTech Connect (OSTI)

The intent of this study is to discuss some of the many factors involved in the development of the design and layout of a steam turbo-generation unit as part of a modular Generation IV nuclear power plant. Of the many factors involved in the design and layout, this research will cover feed water system layout and optimization issues. The research is arranged in hopes that it can be generalized to any Generation IV system which uses a steam powered turbo-generation unit. The research is done using the ORCENT-II heat balance codes and the Salisbury methodology to be reviewed herein. The Salisbury methodology is used on an original cycle design by Famiani for the Westinghouse IRIS and the effects due to parameter variation are studied. The vital parameters of the Salisbury methodology are the incremental heater surface capital cost (S) in $/ft{sup 2}, the value of incremental power (I) in $/kW, and the overall heat transfer coefficient (U) in Btu/ft{sup 2}-degrees Fahrenheit-hr. Each is varied in order to determine the effects on the cycles overall heat rate, output, as well as, the heater surface areas. The effects of each are shown. Then the methodology is then used to compare the optimized original Famiani design consisting of seven regenerative feedwater heaters with an optimized new cycle concept, INRC8, containing four regenerative heaters. The results are shown. It can be seen that a trade between the complexity of the seven stage regenerative Famiani cycle and the simplicity of the INRC8 cycle can be made. It is desired that this methodology can be used to show the ability to evaluate modularity through the value of size a complexity of the system as well as the performance. It also shows the effectiveness of the Salisbury methodology in the optimization of regenerative cycles for such an evaluation.

Williams, W.C.

2002-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Optimal control of leukemic cell population dynamics  

E-Print Network [OSTI]

aspects, as well as theoretical and numerical results on the optimal control .... and inward flow; the transport equation (3) describes the evolution of the age.

2013-09-05T23:59:59.000Z

462

Parametric optimization of hybrid car engines (Final version, published in Optimization and  

E-Print Network [OSTI]

Parametric optimization of hybrid car engines (Final version, published in Optimization the problem of optimal design of hybrid car engines which combine thermal and electric power. The optimal a nonconvex nonsmooth optimization problem with a bundle method. Keywords: Hybrid car engines, bilevel

Bonnans, Frdric

463

Optimization Journals, Sites, Societies  

E-Print Network [OSTI]

Optimization Online Links. Optimization related societies. Mathematical Optimization Society SIAM INFORMS. Optimization related journals. Mathematical...

464

Power and spectrum efficient communications in wireless ad hoc networks  

E-Print Network [OSTI]

Ephremides, Joint Scheduling and Power Control for WirelessOptimal Power Control, Scheduling, and Routing in UWBDistributed Joint Scheduling and Power Control Algorithm for

Qu, Qi

2008-01-01T23:59:59.000Z

465

Flow Characteristics Analysis of Widows' Creek Type Control Valve for Steam Turbine Control  

SciTech Connect (OSTI)

The steam turbine converts the kinetic energy of steam to mechanical energy of rotor blades in the power conversion system of fossil and nuclear power plants. The electric output from the generator of which the rotor is coupled with that of the steam turbine depends on the rotation velocity of the steam turbine bucket. The rotation velocity is proportional to the mass flow rate of steam entering the steam turbine through valves and nozzles. Thus, it is very important to control the steam mass flow rate for the load following operation of power plants. Among various valves that control the steam turbine, the control valve is most significant. The steam flow rate is determined by the area formed by the stem disk and the seat of the control valve. While the ideal control valve linearly controls the steam mass flow rate with its stem lift, the real control valve has various flow characteristic curves pursuant to the stem lift type. Thus, flow characteristic curves are needed to precisely design the control valves manufactured for the operating conditions of nuclear power plants. OMEGA (Optimized Multidimensional Experiment Geometric Apparatus) was built to experimentally study the flow characteristics of steam flowing inside the control valve. The Widows' Creek type control valve was selected for reference. Air was selected as the working fluid in the OMEGA loop to exclude the condensation effect in this simplified approach. Flow characteristic curves were plotted by calculating the ratio of the measured mass flow rate versus the theoretical mass flow rate of the air. The flow characteristic curves are expected to be utilized to accurately design and operate the control valve for fossil as well as nuclear plants. (authors)

Yoo, Yong H.; Sohn, Myoung S.; Suh, Kune Y. [PHILOSOPHIA, Inc., Seoul National University, San 56-1 Sillim-dong, Gwanak-gu, Seoul, 151-742 (Korea, Republic of)

2006-07-01T23:59:59.000Z

466

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 22, NO. 3, AUGUST 2007 1163 A General Formulation for LMP Evaluation  

E-Print Network [OSTI]

. Index Terms--Congestion, decomposition, locational marginal price, losses, optimal power flow. NOTATION of length I. INTRODUCTION LOCATIONAL marginal prices or s constitute the basis of the new generation characteristics, as well as, those of the supply sources. The locational marginal pricing notions are based

Gross, George

467

348 IEEE Transactions on Energy Conversion,Vol. 10, No. 2, June 1995 EFFICIENCY BASED OPTIMAL CONTROLOF KAF'LAN HYDROGENERATORS  

E-Print Network [OSTI]

(EY WORDS hydrogenerator,governor, Kaplan turbine, gate-dominant,optimal control POMENCLAWRE Turbine Speed on hydrogenerators supplied with Kaplan turbines, axial flow turbines controlled by variable pitch blades. In the case of Kaplan turbines,the blade angle is used to maintain peak efficiency over a wide range of power

Schniter, Philip

468

Optimization of Wind Turbine Operation  

E-Print Network [OSTI]

Optimization 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 prototype wind turbine. Statistics of the yaw error showed an average of about 10°. The average flow

469

Results of a preliminary, high power RF thruster test  

SciTech Connect (OSTI)

The objective of this program was to demonstrate a high power electrodeless, RF electric propulsion concept. This was successfully accomplished. No attempt was made to optimize the design of the thruster with regard to physical dimensions, mass flow, nozzle shape, operational frequency, or power level. Measurements made were chamber pressure, total and static pressures at the nozzle exit plane and exhaust tank pressure. Mass flows range from about 0.4 to 1 gm/sec and, assuming perfect gas relationships, specific impulses up to 580 sec were obtained. Typical chamber pressure was 300 torr exhausting to a tank pressure of about 10 torr. Working fluids used were argon, helium and mixtures of the two. No degration of the device was detected after 12 start/stop cycles, about three hours of total run time, and a maximum input power of 70 kW. 10 refs.

Brewer, L.; Karras, T.; Frind, G.; Holmes, D.G.

1989-01-01T23:59:59.000Z

470

Lassoing Line Outages in the Smart Power Grid  

E-Print Network [OSTI]

Fast and accurate unveiling of power line outages is of paramount importance not only for preventing faults that may lead to blackouts, but also for routine monitoring and control tasks of the smart grid, including state estimation and optimal power flow. Existing approaches are either challenged by the \\emph{combinatorial complexity} issues involved, and are thus limited to identifying single- and double-line outages; or, they invoke less pragmatic assumptions such as \\emph{conditionally independent} phasor angle measurements available across the grid. Using only a subset of voltage phasor angle data, the present paper develops a near real-time algorithm for identifying multiple line outages at the affordable complexity of solving a quadratic program via block coordinate descent iterations. The novel approach relies on reformulating the DC linear power flow model as a \\emph{sparse} overcomplete expansion, and leveraging contemporary advances in compressive sampling and variable selection using the least-abso...

Zhu, Hao

2011-01-01T23:59:59.000Z

471

Distributed Generation Dispatch Optimization under Various Electricity Tariffs  

E-Print Network [OSTI]

the Optimization of Cogeneration Dispatch in a Deregulatedheat and power (CHP), or cogeneration, systems make use ofheat and power (CHP), or cogeneration, systems make use of

Firestone, Ryan; Marnay, Chris

2007-01-01T23:59:59.000Z

472

IMPACT OF DYNAMIC VOLTAGE SCALING (DVS) ON CIRCUIT OPTIMIZATION  

E-Print Network [OSTI]

Circuit designers perform optimization procedures targeting speed and power during the design of a circuit. Gate sizing can be applied to optimize for speed, while Dual-VT and Dynamic Voltage Scaling (DVS) can be applied to optimize for leakage...

Esquit Hernandez, Carlos A.

2010-01-16T23:59:59.000Z

473

Utility Accrual Real-Time Scheduling with Energy Bounds In this paper, we consider timeliness and energy optimization in battery-powered, dynamic  

E-Print Network [OSTI]

. An important technique used for optimizing the energy consumption of real-time embedded systems is dynamic in the physical world). Further, they are energy-critical, as they must operate on battery, with finite energy and minimizing the system's energy consumption, and not just the CPU's energy consumption. Moreover, such systems

Ravindran, Binoy

474

JOURNAL OF COMMUNICATIONS AND NETWORKS, VOL. 14, NO. 2, APRIL 2012 151 Sum-Rate Optimal Power Policies for Energy Harvesting  

E-Print Network [OSTI]

Policies for Energy Harvesting Transmitters in an Interference Channel Kaya Tutuncuoglu and Aylin Yener harvesting transmitters. Different than con- ventional battery powered wireless nodes, energy harvesting-filling, energy harvesting net- works, generalized iterative water-filling, interference channel, sum

Yener, Aylin

475

Optimization Neuroimaging'',  

E-Print Network [OSTI]

Canonical Ridge Analysis with Ridge Parameter Optimization F. ?. Nielsen, L. K. Hansen and S. C - PLS 1 = k 0 = k optimal k k = optimal k k £ £ 0 #12; Canonical Ridge Analysis with Ridge Parameter Optimization F. ?. Nielsen, L. K. Hansen and S. C. Strother The Human Brain Project, P20 MH57180 ``Spatial

Nielsen, Finn ?rup

476

Optimization Online - Enter Your Password to Continue  

E-Print Network [OSTI]

Update Entry. Stochastic Optimization for Power System Configuration with Renewable Energy in Remote Areas. Enter the Article Password: If you forgot your...

477

On complexity of stochastic programming problems - Optimization ...  

E-Print Network [OSTI]

employing the Law of Large Numbers that this gives an optimal decision on average. ...... exploding nuclear power plants or airliners falling from the sky.

2005-01-14T23:59:59.000Z

478

Optimization Online - Other Topics Submissions - 2013  

E-Print Network [OSTI]

Risk-Averse Control of Undiscounted Transient Markov Models Ozlem Cavus ... Optimal Power Grid Protection through A Defender-Attacker-Defender Model

479

Optimization Online - Enter Your Password to Continue  

E-Print Network [OSTI]

Optimal Power Grid Protection through A Defender-Attacker-Defender Model. Enter the Article Password: If you forgot your password, select your e-mail address:.

480

Optimization Online - An Overview on Mathematical Programming ...  

E-Print Network [OSTI]

Feb 22, 2015 ... This problem consists in finding the optimal power production schedule of a set of hydro units while meeting several technical, physical, and...

Raouia Taktak

2015-02-22T23:59:59.000Z

Note: This page contains sample records for the topic "optimal power flow" 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

Optimization Online - All Areas Submissions - October 2010  

E-Print Network [OSTI]

The value of rolling horizon policies for risk-averse hydro-thermal planning ... Two-Stage Robust Power Grid Optimization Problem Ruiwei Jiang, Muhong Zhang...

482

Distributed Power Delivery for Energy Efficient and Low Power Systems  

E-Print Network [OSTI]

Distributed Power Delivery for Energy Efficient and Low Power Systems Selc¸uk K¨ose Department are needed to determine the location of these on-chip power supplies and decoupling capacitors. In this paper, the optimal location of the power supplies and decoupling capacitors is determined for different size

Friedman, Eby G.

483

Effect of electron flow on the ordinary-extraordinary mode conversion  

SciTech Connect (OSTI)

Ordinary-extraordinary mode conversion in the electron cyclotron frequency range is revisited in the presence of a flowing electron component. The analytical expressions of optimal parallel refraction index and conversion efficiency are obtained from a one-dimensional cold plasma model. The presence of flowing electrons leads to an outward shift of the conversion layer and therefore increases the optimal value of parallel refraction index. If this effect is not considered, the efficiency of mode conversion degenerates. In typical tokamak plasmas, this degeneration is about a few percentages, which may induce the reflection of several tens of kilowatts of power from the cutoff layer when injecting megawatts of ECRF power into fusion plasma.

Jia Guozhang [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Gao Zhe [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China) and Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031 (China)

2011-10-15T23:59:59.000Z

484

Estimation of steady-state and transcient power distributions for the RELAP analyses of the 1963 loss-of-flow and loss-of-pressure tests at BR2.  

SciTech Connect (OSTI)

To support the safety analyses required for the conversion of the Belgian Reactor 2 (BR2) from highly-enriched uranium (HEU) to low-enriched uranium (LEU) fuel, the simulation of a number of loss-of-flow tests, with or without loss of pressure, has been undertaken. These tests were performed at BR2 in 1963 and used instrumented fuel assemblies (FAs) with thermocouples (TC) imbedded in the cladding as well as probes to measure the FAs power on the basis of their coolant temperature rise. The availability of experimental data for these tests offers an opportunity to better establish the credibility of the RELAP5-3D model and methodology used in the conversion analysis. In order to support the HEU to LEU conversion safety analyses of the BR2 reactor, RELAP simulations of a number of loss-of-flow/loss-of-pressure tests have been undertaken. Preliminary analyses showed that the conservative power distributions used historically in the BR2 RELAP model resulted in a significant overestimation of the peak cladding temperature during the transient. Therefore, it was concluded that better estimates of the steady-state and decay power distributions were needed to accurately predict the cladding temperatures measured during the tests and establish the credibility of the RELAP model and methodology. The new approach ('best estimate' methodology) uses the MCNP5, ORIGEN-2 and BERYL codes to obtain steady-state and decay power distributions for the BR2 core during the tests A/400/1, C/600/3 and F/400/1. This methodology can be easily extended to simulate any BR2 core configuration. Comparisons with measured peak cladding temperatures showed a much better agreement when power distributions obtained with the new methodology are used.

Dionne, B.; Tzanos, C. P. (Nuclear Engineering Division)

2011-05-23T23:59:59.000Z

485

Searching for the Optimal Mix of Solar and Efficiency in Zero Net Energy Buildings  

SciTech Connect (OSTI)

Zero net energy (ZNE) buildings employ efficiency to reduce energy consumption and solar technologies to produce as much energy on site as is consumed on an annual basis. Such buildings leverage utility grids and net-metering agreements to reduce solar system costs and maintenance requirements relative to off-grid photovoltaic (PV)-powered buildings with batteries. The BEopt software was developed to efficiently identify cost-optimal building designs using detailed hour-by-hour energy simulation programs to evaluate the user-selected options. A search technique identifies optimal and near-optimal building designs (based on energy-related costs) at various levels of energy savings along the path from a reference building to a ZNE design. In this paper, we describe results based on use of the BEopt software to develop cost-optimal paths to ZNE for various climates. Comparing the different cases shows optimal building design characteristics, percent energy savings and cash flows at key points along the path, including the point at which investments shift from building improvements to purchasing PV, and PV array sizes required to achieve ZNE. From optimizations using the BEopt software for a 2,000-ft{sup 2} house in 4 climates, we conclude that, relative to a code-compliant (IECC 2006) reference house, the following are achievable: (1) minimum cost point: 22 to 38% source energy savings and 15 to 24% annual cash flow savings; (2) PV start point: 40 to 49% source energy savings at 10 to 12% annual cash flow savings; (3) break-even point: 43 to 53% source energy savings at 0% annual cash flow savings; and (4) ZNE point: 100% source energy savings with 4.5 to 8.1 kW{sub DC} PV arrays and 76 to 169% increase in cash flow.

Horowitz, S.; Christensen, C.; Anderson, R.

2008-01-01T23:59:59.000Z

486

An Exact Algorithm for Power Grid Interdiction Problem with Line ...  

E-Print Network [OSTI]

late the problem of optimal interdiction of an electric power network as a ...... general, critical lines. .... Co-optimization of generation unit commitment and.

2012-01-08T23:59:59.000Z

487

Optimal Design of a Stand-Alone Hybrid PV/Fuel Cell Power System for the City of Brest in France  

E-Print Network [OSTI]

cell power system without battery storage to supply the electric load demand of the city of Brest, battery storage could be needed [8-10]. When the energy storage capacity may be limited, the use, but their complementary combination provides more continuous electrical output and is often supported by storage devices

Paris-Sud XI, Université de

488

Reliability Evaluation of Electric Power Generation Systems with Solar Power  

E-Print Network [OSTI]

Conventional power generators are fueled by natural gas, steam, or water flow. These generators can respond to fluctuating load by varying the fuel input that is done by a valve control. Renewable power generators such as wind or solar, however...

Samadi, Saeed

2013-11-08T23:59:59.000Z

489

To cite this version : Rigo-Mariani, Rmy and Sareni, Bruno and Roboam, Xavier Fast Power Flow Scheduling and Sensitivity Analysis for Sizing a  

E-Print Network [OSTI]

of cost-effectiveness. Keywords ­ Microgrid, storage, optimal scheduling; linear programming, dynamic with the development of energy storage technologies and evolving price policies [3]. Those operations would aim Scheduling and Sensitivity Analysis for Sizing a Microgrid with Storage. (2014) In: 11th International

Mailhes, Corinne

490

Power inverters  

DOE Patents [OSTI]

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

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

2011-11-15T23:59:59.000Z

491

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 4, NOVEMBER 2001 935 Discussion of "A Physical-Flow-Based Approach to  

E-Print Network [OSTI]

to Allocating Transmission Losses in a Transaction Framework" George Gross and Shu Tao The authors are grateful, England. Publisher Item Identifier S 0885-8950(01)09812-1. 1G. Gross and S. Fao, IEEE Trans. Power Systems

Gross, George

492

An Energy-Flow Model for Self-Powered Routers in Rural Mesh Networks and its Application for Energy-Aware Routing  

E-Print Network [OSTI]

Self-powered wireless mesh networks have gained popularity as a cheap alternative for providing Internet access in many rural areas of the developed and, especially, the developing world. The quality of service that ...

Pejovic, Veljko; Belding, Elizabeth; Marina, Mahesh

493

Mesofluidic magnetohydrodynamic power generation  

E-Print Network [OSTI]

Much of the previous research into magnetohydrodynamics has involved large-scale systems. This thesis explores the miniaturization and use of devices to convert the power dissipated within an expanding gas flow into ...

Fucetola, Jay J

2012-01-01T23:59:59.000Z

494

ADAPTIVE POWER CONTROL BY USING THE RECEIVED SNR AS A PROXY FOR DISTANCE TO OPTIMIZE THE SPECTRUM USAGE IN A COGNITIVE RADIO SYSTEMADAPTIVE POWER CONTROL BY USING THE RECEIVED SNR AS A PROXY FOR DISTANCE TO OPTIMIZE THE SPECTRUM USAGE IN A COGNITIVE RADIO SYSTEM.  

E-Print Network [OSTI]

??In this thesis work we have proposed an Adaptive Power Transmission scheme for Cognitive Radio. The proposed scheme estimates the distance between the primary user (more)

Hussain, Rizwan

2009-01-01T23:59:59.000Z

495

PSO2004/FU5766 Improved wind power prediction  

E-Print Network [OSTI]

PSO2004/FU5766 Improved wind power prediction Optimal combined wind power forecasts using exogenous prediction can be accomplished. The application of combining wind power forecasts for certain wind power

496

COMPUTER DESIGN AND OPTIMIZATION OF CRYOGENIC REFRIGERATION SYSTEMS  

E-Print Network [OSTI]

Process Program for Geothermal Power Plant Cycles,"Design and Optimize Geothermal Power Cycles," presented atPower Plant Cycles Using GEOTHM," presented at the Second United Nations' Symposium on The Deve'lQpment and Use of Geothermal

green, M.A.

2011-01-01T23:59:59.000Z

497

Optimization 1-1 Convex Optimization & Duality  

E-Print Network [OSTI]

1 Optimization 1-1 Convex Optimization & Duality EEN634, Spring 2007 BASED ON LECTURES GIVEN AT MIT and Princeton Department of ECE, UMiami Optimization 1-2 #12;2 Optimization 1-3 Optimization 1-4 #12;3 Optimization 1-5 Optimization 1-6 #12;4 Optimization 1-7 Optimization 1-8 #12;5 Optimization 1-9 Optimization 1

Fan, Xingzhe

498

Analysis and design of high frequency link power conversion systems for fuel cell power conditioning  

E-Print Network [OSTI]

In this dissertation, new high frequency link power conversion systems for the fuel cell power conditioning are proposed to improve the performance and optimize the cost, size, and weight of the power conversion systems. The first study proposes a...

Song, Yu Jin

2005-11-01T23:59:59.000Z

499

Semantic Information Integration and Processing for Demand Response Optimization Qunzhi Zhou, Sreedhar Natarajan, Yogesh Simmhan and Viktor Prasanna  

E-Print Network [OSTI]

Semantic Information Integration and Processing for Demand Response Optimization Qunzhi Zhou Demand response optimization (DR) deals with curtailing power consumption when peak demand on the power for Dynamic Demand Response Optimization Existing DR programs are typically based on static planning

Prasanna, Viktor K.

500

7-29 A coal-burning power plant produces 300 MW of power. The amount of coal consumed during a one-day period and the rate of air flowing through the furnace are to be determined.  

E-Print Network [OSTI]

7-11 7-29 A coal-burning power plant produces 300 MW of power. The amount of coal consumed during The heating value of the coal is given to be 28,000 kJ/kg. Analysis (a) The rate and the amount of heat inputs'tQQ The amount and rate of coal consumed during this period are kg/s48.33 s360024 kg10893.2 MJ/kg28 MJ101.8 6

Bahrami, Majid