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Improvement of transient stability limit in power system transmission lines using fuzzy control of FACTS devices

Improvement of transient stability limit in power system tra...

引用

Power Industry Computer Application conference (PICA)

作者： S.M. Sadeghzadeh M. Ehsan N.H. Said R. Feuillet Department of Electrical Engineering Sharif University of Technology Tehran Iran Laboratoire d'Electrotechnique deGrenoble INPG UJF CNRS UMR 5529 ENSIEG Saint Martin d'Heres France

the objective of this paper is to investigate the application of FACTS devices to increase the maximum loadability of power transmission lines which may be constrained by a transient stability limit. Hence, the online fuzzy control of superconducting magnetic energy storage (SMES) and static synchronous series compensators (SSSC) are suggested. the fuzzy rule-bases are defined and explained. the validity of the suggested control strategies are confirmed by simulation tests which show that by the use of the proposed method, the line power transfer can be increased via the improvement of the transient stability limit. Finally, the effect of the control loop time delay on the performance of the controller is presented.

关键词： Power system transients Power system stability Power system control Power systems Power transmission lines Fuzzy control Power system modeling Samarium Sliding mode control Power system dynamics

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Surrogate constraint method for optimal power flow

Surrogate constraint method for optimal power flow

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Power Industry Computer Application conference (PICA)

作者： L. Chen S. Matoba H. Inabe T. Okabe KCC Limited Koto Tokyo Japan Electric Power Development Company Limited Chuo Tokyo Japan

this paper represents a technique based on constraints surrogate defined by the maximum entropy principle for optimal power flow (OPF) problems. One of the obstacles impeding the OPF calculations is the problem associated with handling a large number of functional inequality constraints, which cause computational inefficiencies for large power systems. To cope with this problem, this paper proposes a methodology which aggregates all inequality constraints into one surrogate constraint with a single parameter according to the maximum entropy principle. this implementation not only reduces the scale or dimensions of OPF problems, but also improves the convergence characteristics. Several numerical examples including a practical power system are provided to show the efficiency of the proposed approach.

关键词： Load flow Entropy Constraint theory Power system planning Impedance Aggregates Power systems Constraint optimization Ear Annealing

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Fast service restoration for large-scale distribution systems with priority customers and constraints

Fast service restoration for large-scale distribution system...

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Power Industry Computer Application conference (PICA)

作者： K.N. Miu Hsiao-Dong Chiang Bentao Yuan G. Darling School of Electrical Engineering Cornell University Ithaca NY USA Electric Transmission and Distribution NYSE and G Corporation Binghamton NY USA

A fast, effective service restoration method is designed for large-scale distribution systems with priority customers. the service restoration problem is formulated as a constrained multi-objective optimization problem. A ranking-based search method employing analytical information obtained from three-phase power flow simulations is designed to restore service to as many priority customers as possible while maximizing the amount of total load restored and minimizing the number of required switch operations. the proposed method is designed with consideration to networks which have predominantly manual switches. Comprehensive simulation results of the search method, including priority customers, single and multiple faults and multiple out-of-service areas are presented for a 416 bus distribution network.

关键词： Large-scale systems Power system restoration Switches Design methodology Search methods Constraint optimization Information analysis Load flow analysis Load flow Analytical models

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Generalized state estimation [power systems]

Generalized state estimation [power systems]

引用

Power Industry Computer Application conference (PICA)

作者： O. Alsac N. Vempati B. Stott A. Monticelli PCA Corporation Mesa AZ USA State University of Campinas-UNICAMP Sao Paulo Brazil

Power system state estimation derives a real-time network model by extracting information from a redundant data set consisting of telemetered, predicted and static data items. this paper describes a generalized, fully developed, estimation approach that fundamentally improves the information extraction process. Its main contribution is the successful inclusion of topology and parameters in the estimation and bad data analysis processes. this is valuable both in the initial commissioning of a state estimator, and in its routine real-time and study mode application. the approach involves a variety of novel concepts and methods. It is usable in weighted least squares (WLS) and other estimation approaches.

关键词： State estimation Power systems Power system modeling Data mining Real time systems Predictive models Network topology Parameter estimation Data analysis Least squares approximation

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A new digital filter for phasor computation. II. Evaluation

A new digital filter for phasor computation. II. Evaluation

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Power Industry Computer Application conference (PICA)

作者： H.J. Altuve I. Diaz J.A. de la O Facultad de Ingenieria Mecánica y Eléctrica Programa Doctoral en Ingenieria Eléctrica Universidad Autónoma de Nuevo León Nuevo Leon Mexico

For pt.I see ibid., p.78-83 (1997). the results of the evaluation of a new type of digital filter are presented in this paper. the filter theory is outlined in part I of the paper. the new filter results from the application of a special window to the coefficients of the traditional Fourier, cosine and sine algorithms. It is compared in the paper with the Fourier, cosine and sine filters in terms of steady-state and transient responses. Extensive time-domain simulations are performed to evaluate the filter transient behavior. the new filter is shown to be more accurate than the Fourier filter for window lengths equal or greater than 3 cycles of the fundamental frequency. It retains its accuracy even for window lengths being different from multiples of one cycle. the new filter is suitable for phasor computation for the fault location and measuring functions required in digital distance relays and fault recorders.

关键词： Digital filters Power system transients Frequency response Steady-state Fault location Brain modeling Power system simulation Power system modeling Filtering Time factors

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Intelligent agents for negotiations in market games. II. Application [electricity supply]

Intelligent agents for negotiations in market games. II. App...

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Power Industry Computer Application conference (PICA)

作者： V. Krishna V.C. Ramesh ECE Department Illinois Institute of Technology Chicago IL USA

In competitive electricity markets, human decision-makers need assistance to determine potential coalitions that they can be part of. the authors present an approach for designing specialized intelligent software agents that perform negotiations on behalf of their human counterparts, and then suggest market strategies that the human can adopt. the authors' negotiation protocol is derived from cooperative game theory; however, it differs from the game theory literature in requiring virtually no trustworthy information exchange between the potential condition partners. In this paper, they apply it to power markets.

关键词： Intelligent agent Game theory Power system modeling Humans Costs Power markets Software agents Protocols Power generation Feedback

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Intelligent agents for negotiations in market games. I. Model [electricity supply]

Intelligent agents for negotiations in market games. I. Mode...

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Power Industry Computer Application conference (PICA)

作者： V. Krishna V.C. Ramesh ECE Department Illinois Institute of Technology Chicago IL USA

In competitive electricity markets, human decision-makers need assistance to determine potential coalitions that they can be part of. the authors present an approach for designing specialized intelligent software agents that perform negotiations on behalf of their human counterparts, and then suggest market strategies that the human can adopt. their negotiation protocol is derived from cooperative game theory; however, it differs from the game theory literature in requiring virtually no trustworthy information exchange between the potential coalition partners. In this paper, the authors present the negotiation model.

关键词： Intelligent agent Humans Protocols Game theory Power system modeling Law Legal factors Software agents Power markets Virtual colonoscopy

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Reliability analysis of electric utility SCADA systems

Reliability analysis of electric utility SCADA systems

引用

Power Industry Computer Application conference (PICA)

作者： A.G. Bruce Trans Power New Zealand Limited New Zealand

Electric utility SCADA systems must be highly reliable given the potential for the SCADA system to directly contribute to load curtailment. this paper presents an analysis of SCADA system reliability in terms of its expected aggregate contribution to load curtailment on the power system. Expressing this aggregate in system minutes and applying an appropriate damage cost function then provides an annual cost measure of SCADA system reliability worth. A composite generation and transmission system reliability evaluation technique is used to perform the numerical analysis of the joint SCADA and power system model. this performs a Monte-Carlo simulation and includes an optimal power flow for enumerating grid load curtailment states and analysis of SCADA system component connectivity to determine availability of SCADA control. the application of this analysis is illustrated in a comparison of two alternative SCADA architectures. Trans Power has adopted a subtransmission SCADA architecture which utilises terminals operating off its national SCADA system. these terminals have replaced separate systems located in each area. the objective of the evaluation being to quantify the increased exposure to financial losses due to joint load curtailment.

关键词： Power industry SCADA systems Power system reliability Power system modeling Aggregates Power system analysis computing Power system measurements Cost function Power generation Performance evaluation

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Simulation of unified static VAr compensator and power system stabilizer for arresting subsynchronous resonance

Simulation of unified static VAr compensator and power syste...

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Power Industry Computer Application conference (PICA)

作者： S.A. Khaparde V. Krishna Department of Electrical Engineering Indian Institute of Technology Bombay India Department of ECE Illinois Institute of Technology Chicago USA

In the literature, the co-ordination of static VAr compensators (SVC) and power system stabilizers (PSS) using generator speed deviation or modal speeds such as stabilizing signals is shown to damp power system oscillations. though such schemes are able to damp the SSR modes for small disturbances, they are unable to damp transient SSR due to large disturbances. In this report, an improvement in the control aspect of the SVC at the midpoint of the power transmission line is suggested. this scheme attempts different auxiliary signals that include line current, computed internal frequency and bus angle deviations. A system of configuration similar to IEEE First Bench Mark model is considered, eigenvalue analysis has been carried out and results indicate that bus angle deviation signal as an auxiliary control signal for SVC was able to damp most of the modes leaving some of them still oscillatory. the main feature of the proposed work is to use a combination of the deviation in speed and electrical power output of the generator as input signals to PSS which operates simultaneously along with SVC. Such a simultaneous PSS and SVC scheme is found to improve power system damping under large disturbances, i.e. the growth of system oscillations is arrested. Control simulations are carried out on PSCAD. the efficacy of controllers to damp SSR under steady state and faulted conditions, where one of the torsional modes is excited, is presented and discussed.

关键词： Power system simulation Static VAr compensators PSCAD Power system transients Power generation Signal generators Power transmission lines Frequency Power system modeling Eigenvalues and eigenfunctions

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Hamilton-Jacobi-Bellman optimal design of functional link neural network controller for robot manipulators

Hamilton-Jacobi-Bellman optimal design of functional link ne...

引用

Proceedings of the 1997 36th IEEE conference on Decision and Control. Part 1 (of 5)

作者： Kim, Young H. Lewi, Frank L. Dawson, Darren M. Univ of Texas at Arlington Fort Worth United States

the paper is concerned with the application of quadratic optimization for motion control to feedback control of robotic systems using neural networks. Explicit solutions to the Hamilton-Jacobi-Bellman (H-J-B) equation for optimal control of robotic systems are found by solving an algebraic Riccati equation. It is shown how neural networks can cope with nonlinearities through optimization with no preliminary off-line learning phase required. the adaptive learning algorithm is derived from Lyapunov stability analysis, so that both system tracking stability and error convergence can be guaranteed in the closed-loop system. the filtered tracking error or critic gain and the Lyapunov function for the nonlinear analysis are derived from the user input in terms of a specified quadratic performance index. Simulation results on a two-link robot manipulator show the satisfactory performance of the proposed control schemes even in the presence of large modeling uncertainties and external disturbances.

关键词： Control system synthesis

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