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IEEE Winter Meeting power engineering Society

作者： G. Sybille Hoang Le-Huy Power System Simulation Laboratory Institut de recherche d''Hydro-Quebec Varennes QUE Canada Department of Electrical and Computer Engineering Université Laval Sainte-Foy QUE Canada

The power system Blockset (PSB) is a graphic tool that allows schematics and simulation of power systems to be built in the Simulink environment. The blockset uses the MATLAB/Simulink environment to represent common components and devices found in electrical power networks. Simulink's variable-step event-sensitive integration algorithms allow increased accuracy in zero-crossing detection of currents as compared with fixed step algorithms. One important feature of the power system Blockset which has been introduced with version 2.0 is its ability to simulate either with continuous variable time-step integration algorithms or with a discretized system. For small and medium size systems, variable time steps algorithms are usually faster because the number of steps will be less than with a fixed-time step method. However, for large systems which contain many states or many nonlinear blocks such as power electronic switches, it is advantageous to discretize the electrical system. Both the continuous integration and fixed-time step methods are illustrated. The graphic interface of Simulink provides a user-friendly environment where the power circuit and control system are represented in the same diagram. The results are displayed while the simulation is running. The processing power of MATLAB allows the designer to perform complex post-processing on simulation results. This special technical session presents the features of the power system Blockset and its applications in the simulation of power systems and power electronics systems.

关键词： power system simulation Digital simulation MATLAB power electronics Circuit simulation Libraries power system modeling power system analysis computing Graphics Control systems

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Characterization of electrical incipient fault signature resulting from tree contact with electric distribution feeders

Characterization of electrical incipient fault signature res...

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IEEE Summer Meeting power engineering Society

作者： K.L. Butler B.D. Russell C. Benner K. Andoh Power System Automation Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

As budgets have decreased for regular trimming of trees on utility distribution systems in the US, the systems have become more likely to experience contact of branches of trees with distribution conductors. Detection of this phenomenon could provide vital predictive maintenance information. This paper discusses research efforts to characterize the tree contact phenomenon through field experiments, visual observations, and computer data analysis. A single-phase lateral is attached to a pole from which three phase lines have been tapped off an overhead distribution system. Tests were staged by bringing tree limbs and branches of trees in their natural setting into contact with a live phase conductor of the medium voltage overhead line and then energizing the lateral. Various types and sizes of tree branches and limbs were used in the tests. Visual observations made before, during and after the tests and the analytical properties of this behavior are discussed.

关键词： Contacts Conductors Medium voltage Testing Circuit faults IEEE members power system faults automation Laboratories Predictive maintenance

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Characteristics of transformer parameters during internal winding faults based on experimental measurements

Characteristics of transformer parameters during internal wi...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： P. Palmer-Buckle K.L. Butler N.D.R. Sarma Power System Automation Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

This paper describes in detail, field experiments performed on a single-phase, distribution transformer to study the behavior of transformer terminal parameters during internal winding faults. A custom-built transformer provided with external taps was used for these tests. The taps were used to stage various internal winding faults in the transformer. Terminal values of voltages and currents were monitored and the results presented. A comparison of these results with simulation results is also presented.

关键词： power transformer insulation Oil insulation Phase transformers power transformers Dielectrics and electrical insulation Testing Fault diagnosis Electric breakdown Aging Breakdown voltage

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Analysis of incipient behaviour of multiple distribution insulators

Analysis of incipient behaviour of multiple distribution ins...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： K.L. Butler S. Khan B.D. Russell Power System Automation Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

This paper presents research characterizing the leakage (incipient behaviour) of single and multiple distribution insulators through staged experiments. Four sets of field experiments were conducted over a two year period in which single and multiple insulators were artificially contaminated and energized on a lateral of a distribution system. More than 70 recordings were obtained from monitoring at the site of the insulator(s) under study and at the substation feeding the lateral. This paper focuses on the characterization of the site recordings. Individual insulator leakage currents showed an erratic behaviour with bursts lasting from half a cycle to several seconds. The multiple insulators conveyed a cumulative behaviour caused by individual insulators in various stages of leakage. The results are characterized graphically in the time and frequency domains.

关键词： Insulation Substations Predictive maintenance Insulator testing Monitoring Leakage current Electric breakdown power system reliability Flashover Moisture

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A new method of network reconfiguration for service restoration in shipboard power systems

A new method of network reconfiguration for service restorat...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： K.L. Butler N.D.R. Sarma V.R. Prasad Power System Automation Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA CMC Limited India Department of Industrial Engineering Texas A and M University College Station TX USA

The electric power systems of ships supply energy to sophisticated systems for weapons, communications, navigation and operation. Circuit breakers (CBs) and fuses are provided at different locations in order to remove faulted loads, generators or distribution systems from unfaulted portions of the system. These faults could be due to material causalities of individual loads or cables or due to widespread system fault due to battle damage. Because of the faults and after isolating the fault, there are unfaulted sections which are left without supply. It is required to quickly restore supply to these unfaulted sections of the shipboard power systems. This paper presents a new method to reconfigure the network to restore service to unfaulted sections of the system. The problem is formulated as a modification of the fixed charge network flow problem. The proposed method is illustrated using different case studies.

关键词： power system restoration Intelligent networks Circuit faults Cables power system interconnection power generation Circuit breakers USA Councils Fuses Switching circuits

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Practical high-impedance fault detection on distribution feeders

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 1997年第3期33卷 635-640页

作者： Benner, CL Russell, BD Department of Electrical Engineering Power System Automation Laboratory Texas A and M University College Station TX USA

Distribution protection systems must balance dependability with security considerations to be practical, This is quite difficult for high-impedance faults, Only highly sensitive algorithms can achieve absolute dependability in detecting very low current faults, This high sensitivity results in a propensity for false tripping, creating a less secure system and resulting in the potential for decreased service continuity and lower reliability, Researchers at Texas A&M University have balanced fault detection with fault discrimination, resulting in a practical combination of detection algorithms in a commercially viable system, This device has many ''intelligent'' features, including the ability to analyze and correlate numerous fault characteristics in real time, so that a correct determination of the status of the feeder can be made with a high probability of accuracy, This paper describes the use of multiple algorithms to detect various types of faults and the use of an expert decision maker to decipher incoming data, to determine the status and health of a distribution feeder, Requirements for a practical, secure high-impedance fault relay are also discussed. Finally, Texas A&M has licensed this technology to a commercial partner, which manufactures a device that detects high-impedance faults, in addition to performing numerous other monitoring and protection functions.

关键词： arcing fault broken conductor downed conductor expert system fault detection high-impedance fault

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Analysis of high impedance faults using fractal techniques

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IEEE TRANSACTIONS ON power systemS 1996年第1期11卷 435-440页

作者： Mamishev, AV Russell, BD Benner, CL Power System Automation Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

Phase currents and voltages in a distribution power system change with a certain degree of chaos when high impedance faults (HIFs) occur. This paper describes application of the concepts of fractal geometry to analyze chaotic properties of high impedance butts. Root-mean-square rather that instantaneous values of currents are used for characterization of temporal system behavior;this results in relatively short time-series available for analysis. An algorithm is presented for pattern recognition and detection of HIFs;it is based on techniques suited for analysis of relatively small data sets. Examples are given to illustrate the ability of this approach to discriminate between faults and other transients in a power system.

关键词： high impedance fault power lines fractals

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Practical High Impedance Fault Detection for Distribution Feeders

Practical High Impedance Fault Detection for Distribution Fe...

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Rural Electric power Conference

作者： C.L. Benner B.D. Russell Power System Automation Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

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Reporting bulk power system delivery point reliability

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IEEE TRANSACTIONS ON power systemS 1996年第3期11卷 1262-1267页

作者： Weber, E Adler, B Agarwal, S Allan, R Bhavaraju, M Billinton, R Blanchard, M DAquanni, R Ellis, R Endrenyi, J Garrison, D Grigg, C Luehmann, M Odom, J Preston, G Rau, N Reppen, N Salvaderi, L Schilling, M Schneider, AW Vojdani, A White, T Division of System Studies Western Area Power Administration Billings MT Reliability and Performance PECO Energy Company Philadelphia PA Electrical Energy Systems UMIST Manchester UK General Reliability CA Public Service Electric and Gas Company Newark NJ Esearch and Extension University of Saskatchewan Saskatoon SAS Canada IREQ (Hydro-Quebec) Varennes Canada Applied Resources Group Inc. Brookline MA Power System Operations Bonneville Power Administration Vancouver WA Ontario Hydro Technologies Toronto ONT Canada Duke Power Company Charlotte NC Department of Electrical and Computer Engineering Rose-Hulman Institute of Technology Terre Haute IN Consumers Power Company Jackson MI Florida Power Corp. Saint Petersburg FL Utility Dept. City of Austin Elect. Austin TX Utility Planner National Renewable Energy Laboratory Golden CO Power Technologies Inc. Schenectady NY ENEL-Planning Dept. Rome Italy Universidade Federal Fluminense Brazil MAIN Coordination Center Lombard IL Electrical Systems EPRI Palo Alto CA MAPP Coordination Center Minneapolis MN

This paper is part of an ongoing activity of the IEEE Application of Probability Methods Subcommittee to advance the probabilistic methods used to analyze Bulk power system (BPS) reliability. The objective of the Task Force is to develop a set of guidelines for measuring delivery point reliability. This involves reviewing published literature and other documentation of existing procedures, definitions, and indices. This report presents the results of the Task Force efforts to compile a useful set of terms and procedures for consistent reporting of BPS delivery point reliability.

关键词： power system reliability Guidelines power system measurements power measurement power system analysis computing Force measurement power system planning power system security power system transients power system harmonics

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An object-oriented approach to video coding via the CNN Universal Machine

An object-oriented approach to video coding via the CNN Univ...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： A. Toffels T. Roska L.O. Chua Inst. of Power Syst. & Power Econ. Tech. Hochschule Aachen Germany Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Nonlinear Electronics Laboratory at the Department of Electrical Engineering and Computer Science University of California Berkeley USA

The cellular neural network Universal Machine (CNNUM) is applied to object-oriented image compression algorithms and proves its universality as a hardware platform for future applications. The estimated processing times allow a real-time analysis of the video sequence and outdo the performance of other comparable digital devices reported.

关键词： Video coding Cellular neural networks Turing machines Image segmentation Labeling Image coding power system economics power engineering computing Video sequences Video compression

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