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Simple robust adaptive control of static VAR compensator

European Transactions on electrical power 1993年第6期3卷 429-435页

作者： Machowski, J. Nelles, D. Jan Machowski (1950) received the M.Sc. degree in Electrical Faculty of Warsaw University of Technology in 1974. For two years he was employed in the Power Dispatching Centre in Warsaw/Poland. Later after gaining some field experience in several power plants he did a postgraduate study at Warsaw University of Technology where he received his Ph.D. degree in 1979. In the same year he joined the Electrical Faculty of Warsaw University of Technology where he is presently employed as a professor and head of the power system protection and control group. His areas of interest are power systems analysis protection and control. Since October 1989 he has been with Kaiserslautem University/Germany. (Univ. Kaiserslautern FB Elektrotechnik. P.O. Box 30 49 67618 Kaiserslautem T +4963/205-3431 Fax +49631/205-21 68) Dieter Nelles (1939). VDE received the Dipl.-Ing. degree in electrical engineering in 1966 from the Technical University in Darmstadt/Germany and the Dr.-Ing. degree in 1973 from the Technical University of Berlird/Germany. Since 1966 he has been with the Technical and Science Department of AEG-Telefunken (Frankfurt/M Germany) as a research engineer and since 1972 as the head of this department. In 1982 he joined the Electical Faculty of Kaiserslautem University where he presently is il professor of eletrical engineering and head of the Electrical Energy Supply Group. His special areas of interest are powersystem stability. power system protection and power system control. He is a member of VDE and serves as the chairman of Synchronous Machines Regulation and Excitation Systems Committee. (Univ. Kaisers-lautem FB Elektrotechnik. P.O. Box 304967618 Kaiserslautem T +49631/205-28 46 Fax +49631/205-21 68)

A study of power system transient stability enhancement through effective use of static VAR compensator is presented. It is shown that optimal state‐variable control can be approximately realized as a simple closed‐loop control based on locally measurable electric quantities. In order to make this regulation more effective and insensitive to the changes of the network parameters and loading condition it is proposed to use simple adaptive control with dynamic gain tuned by additional control loops. Tests done for two‐machine and multi‐machine systems have confirmed the validity and robustness of the proposed control method. Copyright © 1993 John Wiley & Sons, Ltd.

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REACTIVE power OPTIMIZATION IN LARGE-SCALE power-systems

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INTERNATIONAL JOURNAL OF electrical power & ENERGY systems 1992年第4期14卷 276-283页

作者： YEHIA, M GHANDOUR, I SAIDY, M STROEV, VA Faculty of Engineering American University of Beirut USA Department of Electrical Power Systems Moscow Power Engineering Institute Moscow Russia

This paper presents a new optimization algorithm for solving reactive power compensation (RPC) problems in complex power systems. The algorithm optimizes the reactive power flow, and determines the total amount of capacitors required and allocates them in electrical networks. It is based on the Y matrix, which consequently improves the throughput of execution and the interaction with the load flow module. The nonuniformness of real power systems and the contribution of generators are easily taken into consideration.

关键词： REACTIVE power OPTIMIZATION LARGE SCALE power systems

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Harmonic insertion in PWM inverter drive schemes

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European Transactions on electrical power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

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Novel criteria for overload management in power transformers

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European Transactions on electrical power 1992年第2期2卷 77-82页

作者： Arri, E. Mocci, F. Tosi, M. Prof. Ernesto Arri (1927) IEEE and AEI received the Dr.-Ing. degree in Electrical Engineering from Politecnico di Torino. Turin Italy in 1952. and the Libera Docenza degree in Electrical Measurement in 1970. Since 1952 he was Assistant Professor of Elecmcal Engineering at the Politecnico Torino. In 1%1 he joined the Istituto Elettrotecnico Nazionale Galileo Ferraris (EN) Turin where he has beenChief of the Electrical Metrology Dcpment from 1965 to 1985 working on the establishment and maintenance of Italian primary units as well as on precision electrical measurements. Since 1984 he became Associate Professor of Measurement Theory at Politecnico di Torino. Then he taught Electrical Measurements as Full Professor at the University of Cagliari from 1986 to 1990 and since 1991 again at Polihyphen tecnico di Torino. He is also an Italian delegate to IEC TC66 and TC85 for electrical and electronic instruments. (Politecnico di Torino Dip. Autom.-Inform. C.so Duca Abruzzi 241-10129Turin.T+39 11/5647022.Fax+3911/5647099) Prof. Francesco Mpcci (1940) received the Dr.-Ing. degree engneering from the University of Cagliari Italy. in 1965. From 1965 to 1980 he was assistant Professor of Electrical Engineering at the Institute of Electrotechnics of the University of CagliariItaly. In 1980 he became Associate Professor of Electrical Engineering the same University. His majorfield of interest includes electrical power systems and components digital and analog signal processing and network theory. (Institute of Electrotechnics Faculty of Engineering Piazz D'Armi' 1-09123 Cagliari T + 3970/281342 Fax + 3970/291619) Dr.-Ing. Mario Tosi (1950)received the Dr.-Ing. degree from the University of Cagliari Italy in 1975 in Mechanical Engineering. In 1975 he joined the Institute of Electrotechnics of the University of Cagliari Italywhere he has been teaching Applied Electronics since 1979. His working areas include power electronics photovoltaic conversion and electronic measurements. (Institute of Electro-Facu

In this paper some new strategies for protecting power transformers, based on the possibility of taking measurements on machines in real operating conditions, are discussed. Earlier works showed that it was possible to determine on‐line power losses of transformers. Here the conditions that permit to separate the measured power losses into core and copper losses are defined more in detail and the possibility of incorporating these measurement techniques into a load management system, in which the real‐time transformer temperatures can be rapidly predicted, is discussed. The direct measurement of on‐line transformer losses makes it possible to achieve thermal protection of power transformers with novel strategies. Copyright © 1992 John Wiley & Sons, Ltd.

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Optimal re‐configuration of distribution network for loss reduction using non‐linear programming

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European Transactions on electrical power 1991年第6期1卷 317-324页

作者： Augugliaro, A. Dusonchet, L. Mangione, S. Antonino Augugliaro (1949) received the Doctor's degree in Electrical Engineering from the University of Palermo Italy in 1975. Since 1976 he has been working as Assistant Professor at the “Istituto di Elettrotecnica ed Elettronica” of the University of Palermo (now: Dipartimento di Ingegneria Elettrica). Since 1978 he is Associate Professor of Electrical Power Generation Plants at the Faculty of Engineering of the same University. His main research interests are in the following fields: simulation of electrical power systems transmission over long distances six-phase transmission mixed power system analysis optimization methods on electrical distribution systems design. (Dipartimento di Ingegneria Elettrica. Universiti di Palermo. Viale delle Scienze 1-90128 Palermo Italy T +3991/48 9856 Fax +3991/488452) Luigi Dusonchet (1948) received the Doctor's degree in Electrical Engineering from the University of Palermo Italy in 1975. Since 1975 he has been working as Assistant Professor at the “Istituto di Elettrotecnica ed Elettronica” of the University of Palermo (now: Dipartimento di Ingegneria Elettrica). From 1978 to 1990 he has been Associate Professor and now he is Full Professor of Industrial Electrical Systems at the Faculty of Engineering of the same University. His main research interests are in the following fields: simulation of electrical power systems optimization methods on electrical distribution systems design. (Dipartimento di Ingegneria Elettrica Universita di Palermo Viale delle Scienze 1-90128 Palermo Italy T +3991/489856 Fax +3991/488452) Stefan0 Mangione (1955) received the Doctor's degree in electrical engineering from the University of Palerrno 'Italy in 198 1. In 1982 he joined the “Istituto di Elettrotecnica ed Elettronica” (now: Dipartimento di Ingegneria Elemica) of the University of Palermo as a Researcher. Since 1983 he has been an Assistant Professor at the same University. His research interests are in the fields of the optimization methods on electrical distribution sy

This paper deals with the problem of optimizing radially operated meshed networks in order to obtain the radial configuration which satisfies the condition of minimum power losses and also the technical constraints normally adopted for such systems. After reporting the state of art on distribution network reconfiguration, the mathematical approach to the solution of the normal state re‐configuration for loss reduction is presented, together with the non‐linear optimization model. In the proposed model, sectionalizing switches are simulated as variable resistances. By starting from the meshed network obtained by closing all switches optimal solution is found directly;the solution is addressed towards the radial structure by some suitable constraints. To solve the problem, a suitable non‐linear programming package is used. Finally some results referring to a hypothetical medium voltage test network are reported. Copyright © 1991 John Wiley & Sons, Ltd.

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Database/power‐flow interlinkage of a stand‐alone power system training simulator

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European Transactions on electrical power 1991年第6期1卷 311-316页

作者： Rumpel, D. Nagdy, N.M. Ader, T. Dr.-Ing. Dieter Rumpel (1932) VDE is full professor and since 1978 head of the Power Systems Institute of Duisburg University/Germany. He got his Dip1.-Ing. degree from the Technical University Munich and his Dr.-Ing. degree from the Technical University Berlin. Before his call to Duisburg he worked at Siemens AG for 23 years. (Universiat-GH-Duisburg Fachbereich Elektrotechnik PF 10 15 03W-4100 Duisburg T +49 20 3/3 79-34 37) .-Ing degree there. Since 1988 he is a member of the scientific staff at the Power Systems Institute of Duisburg University/Germany. (Universittit-GH-Duisburg Fachbereich Elektrotechnik PF 10 15 03 W-4100 Duisburg T 4 9 20 3l3 79-35 27) Dr.-Ing. Nagdy M. Nagdy (1948) VDE. is lecturer at the Technical Faculty of Al-Azhar University in Cairo/Egypt. He received his Dr.-Ing. degree from Duisburg University in 1986 with a thesis on topologyevaluation in electrical power systems. (Al-Azhar University Faculty of Electrical Engineering Nasr CityCairoEgypt)

A training simulator imitates the performance of a power system by application of dynamic models for power units, networks and loads. The results must be displayed in a form related to real operation. This implies a presentation of the power system both on operational and on model level, and transitions between both levels. The GDL‐system allows to describe the whole operational stock of objects, e. g. for substations, bays, lines, protection and auxiliary equipment alarms, including their potential topology, in format‐free alphatext. This source is translated into a data model according to general rules. From the data model an operational man/ machine interface is automatically derived. The dynamic model of the simulator was already presented by K. Dickers and D. Rumpel in „Modelling for Grid Restoration Studies „(Electr. power&Energy systems Vol. 9 (1987) No. 1, pp. 45‐55). The present paper shows, how the power flow of the dynamic model is automatically linked to the GDL data model, without further program adaptions or parametrizing efforts on model level. Copyright © 1991 John Wiley & Sons, Ltd.

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A RELIABLE AND EFFICIENT LINEAR-PROGRAMMING ALGORITHM FOR 2-LEVEL power-SYSTEM STATE ESTIMATION

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ELECTRIC power systems RESEARCH 1988年第1期14卷 51-60页

作者： LO, KL SALEM, MM Power Systems Research Group Department of Electronic and Electrical Engineering University of Strathclyde 204 George Street Glasgow Scotland U.K. Control and Computing Engineering Faculty of Engineering El-Mansoura University El-Mansoura Egypt

Two linear programming (LP) algorithms for the integrated state estimation (ISE) for the whole system are formulated and tested. It was found that a direct application of an ISE on a large power system suffers certain limitations. This paper presents an efficient and reliable two-level state estimator (TLSE) based on LP techniques. Both the ISE and the proposed TLSE were tested under different conditions. The results are discussed and comparisons are given which show that the TLSE has many advantages over the ISE.

关键词： ELECTRIC power systems

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IMPROVEMENT OF ALGORITHM USING INTERVAL ANALYSIS FOR SOLUTION OF NONLINEAR CIRCUIT EQUATIONS.

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Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi) 1987年第9期70卷 1-10页

作者： Okumura, Kohshi Kishima, Akira Saeki, Shuichi Faculty of Engineering Kyoto University Kyoto Japan 606 NTT Ltd. Chofu Japan 108 Shuichi Saeki graduated 1983 Dept. Electronic Eng. Fac. Eng. Kyoto University. Completed Master's program 1985 Graduate School and affiliated with NTT. Engaged in researches in interval analysis. Akira Kishima graduated 1951 Dept. Electrical Eng. Fac. Eng. Kyoto University. Completed Grad. School 1956. Assoc. Prof and presently Prof. Fac. Eng. (2nd Dept. Electrical Engineering) Kyoto University. Doctor of Engineering. Engaged in researches in electrical circuit power circuit and systems.

This paper describes an improvement of the solution by Krawczyk, Moore and Jones (KMJ algorithm) for nonlinear equations based on the interval analysis. When the KMJ algorithm is applied to practical problems such as the determination of the operating point of a multistable electronic circuit, a large computation time is required. It is shown that the algorithm can be improved in the computation time by a preprocessing and an elaboration in the region partitioning.

关键词： ELECTRIC NETWORKS, NONLINEAR

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NUMERICAL METHOD FOR ANALYZING TRANSIENT AND STEADY STATES OF SINE WAVE OSCILLATOR CIRCUIT WITH STIFFNESS.

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Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi) 1987年第10期70卷 1-11页

作者： Okumura, Kohshi Kishima, Akira Yasuda, Hisashi Faculty of Engineering Kyoto University Kyoto Japan 606 Kohshi Okumura graduated 1966 Dept. Electrical Eng. Fac. Eng. Kyoto University. Completed doctoral program 1971 Grad. School and Assistant Kyoto University. Doctor of Engineering. Presently Lecturer Dept. Electrical Eng. Engaged primarily in researches in nonlinear circuits lightning surge performance hysteresis characteristics and so forth. Member IEEJ IECEJ and IEEE. Hisashi Yasuda graduated 1981 Dept. Electrical Eng. Fac. Eng. Kyoto University. Completed Master's program 1983 Grad. School. Presently with Nippon Steel Co. Ltd. Member IECEJ. Nippon Steel Corporation Kitakyushu Japan 805 Akira Kishima graduated 1951 Dept. Electrical Eng. Fac. Eng. Kyoto University. Completed Grad. School 1956. Assoc. Prof. Presently Prof. Dept. Electrical Eng. Fac. Eng. Kyoto University. Doctor of Eng. Engaged in researches in electrical circuit power circuit and systems.

This paper proposes a method for analyzing the transient and steady states of a sine wave oscillator circuit with reactive elements which have large differences in their values. The circuit equation is represented by an autonomous nonlinear differential equation with the values of these elements. First, we describe the method for solving numerically the differential equation regardless of the stiffness by the asymptotic method developed by Krylov, Bogolyubov and Mitropolskiy. Second, we present the method for obtaining solutions of the differential equation with regard to the stiffness by combining the asymptotic method with numerical integration.

关键词： OSCILLATORS

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Repair of TMI-1 OTSG tube failures. Use of a kinetic tube-expansion process to resesal tubes within the upper tube sheet provides a cost-effective and relatively low-expousure repair process

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Process Safety Progress 1983年第3期2卷 173-175页

作者： David G. Slear Robert L. Long James D. Jones F. S. Giacobbe GPU Nuclear Parsippany N.J. 07054 In 1974 David Slear joined General Public Utilities Nuclear Corp. where his responsibilities included the design review of components for new nuclear power plants and troubleshooting component failures both in nuclear power and fossil plants in the GPU System. In 1978 he was promoted to Preliminary Engineering Manager and was responsible for coordinating the preparation of design criteria for several coal-fired plants and combustion turbines to be installed throughout the 1980s. Immediately following the TMI-2 accident he was placed in charge of coordinating the establishment of criteria and the design for numerous modifications that were perceived to be required in order to maintain core cooling and a stable safe shutdown condition for the TMI-2 reactor. Subsequently he was promoted to Manager of TMI Engineering Projects which involved establishing the criteria and coordinating the engineering for the numerous modifications required to TMI-1 as a result of the Lessons Learned from the accident at TMI-2. He holds a B.S. Degree in Mechanical Engineering and an M.S. Degree in Mechanical Engineering. Since April 1982 Robert L. Long has been Vice President and Director of the Nuclear Assurance Division of the GPU Nuclear Corp. This includes responsibilities for the Quality Assurance Department the Nuclear Safety Assessment Department the Training & Education Directorate and the Emergency Preparedness Department. Joining GPU in 1978 he has been actively involved with Three Mile Island recovery and restart activities since the spring of 1979. From February 1980 through March 1982 he served as Director–Training & Education for GPU Nuclear. He holds the B.S. degree in Electrical Engineering from Bucknell University and the M.S.E. and Ph.D. degrees in Nuclear Engineering from Purdue University. He has written numerous publications and has presented lectures on “energy and the environment” issues all over the United States and in Southeast Asia. Since joining GPU Nuclear Corpo

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