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An approach to the direct analysis of transient stability

European Transactions on electrical Power 1993年第3期3卷 241-248页

作者： Djukanovic, M.B. Sobajic, D.J. Pao, Y.‐H. Miodrag B. Djukanovic (1959) received his B.S. M.Sc. and Ph.D. degrees in Electrical Engineering from the University of Belgrade/Yugoslavia in 1982 1985 and 1992 respectively specializing in electric power systems. In 1984 he joined the Electrical Engineering Institute “Nikola Tesla” in Belgrade where he was working on the scientific studies in the field of power systems planning operation and control. In 1985 and 1990 he was appointed as a research scholar at the Royal Institute of Technology Stockholm and Case Western Reserve University Cleveland Ohio. His major in- terests are in the area of power system analysis steady-state and dynamic security and application of neural networks in electric power systems. (Electrical Engineering Institute “Nicola Tesla” ul. Koste Glavinica 8A YU-11000 Belgrad T +3811/2351-619 Fax + 3811/2351-823) Dejan J. Sobajic (1949) received the B.S.E.E. and the M.S.E.E. degrees from the University of Belgrade/Yugoslavia in 1972 and 1976 respectively and the Ph.D. degree from Case Western Reserve University Cleveland Ohio in 1988. At present he is with the Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland. He is also the Engineering Manager of A1 WARE Inc. Cleveland. His current research interests include power system operation and control neuralnet systems and adaptive control. He is a member of the IEEE Task Force on Neural-Network Applications in Power Systems and of the IEEE Intelligent Controls Committee. He is the Chairman of the International Neural-Networks Society Special Interest Group on Power Engineering. (Case Western Reserve University Department of Electrial Engineering and Computer Sciences Glennan Building Ohio 44 106 USA T + 1216/421-2380 Fax +1216/368-8776) Yoh-Han Pao (1922) has been a Professor of Electrical Engineering and Computer Science at Case Westem Reserve University (CWRU) Cleveland Ohio since 1967. He has served as chairman of the University's Electrical Engineering Department

The Transient Energy Function (TEF) method has been intensely investigated over the last decade as a reliable and accurate tool for transient stability assessment of multimachine power systems. In this paper we propose the Potential Energy Boundary Surface (PEBS) based method for direct analysis of transient stability. The critical value of transient energy and the Critical Clearing Time (T_CCT) are evaluated without the need for successive calculation and memorization of the system kinetic and potential energy values along the sustained fault trajectory. The method is used for determination of output features in the training phase of the neural‐net based transient security assessment. The proposed approach is tested on the well‐known ten‐generator New England test system demonstrating the validity and accuracy of obtained results. Copyright © 1993 John Wiley & Sons, Ltd.

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A comparative study of neural vs. conventional methods for modeling and prediction

A comparative study of neural vs. conventional methods for m...

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IEEE International Symposium on Intelligent control (ISIC)

作者： J.D. Donne U. Ozguner Drive Control Systems Division AEG Automation Systems Corporation Pittsburgh PA USA Department of Electrical Engineering Ohio State Uinversity Columbus OH USA

Neural network and conventional methods for system modeling and prediction are discussed in a unified way. Both linear and nonlinear examples are used to show that by using a black-box approach, the methods are equivalent with the exception of the parametrization process. A comparison of neural network methods with an extended Kalman filter for the case of a nonlinear system demonstrates that neural methods require very few a priori assumptions about the underlying model structure. It is shown, using a flexible space structure example, that neural networks can more readily handle the problem of underparametrization than conventional techniques. In all cases, the neural implementations provide results that are at least as accurate as the conventional methods, where the figure of merit is the variance of the output error signal.< >

关键词： Predictive models Neural networks Finite impulse response filter Nonhomogeneous media Sun Supercomputers

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A pattern recognition approach for steady‐state security evaluation of an electrical power system

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European Transactions on electrical Power 1991年第5期1卷 243-251页

A new pattern recognition approach to steady‐state security evaluation of electrical power systems is presented. Such approach is based upon a combined use of the „nearest‐neighbour” method and of an opportune system model ‐ previously proposed by the authors ‐for the basis of knowledge generation. In the first part of the paper, the definition of steady‐state security and the problems arising from its on‐line evaluation are briefly recalled. Then, the pattern recognition approach proposed is described in some detail, and its ability in order to overcome the computational drawbacks of traditional methods is illustrated. Afterwards, some remarks on the system model utilized are reported. Finally, a numerical experiment with reference to the AEP 14 bus test system is presented, showing very encouraging results. Copyright © 1991 John Wiley & Sons, Ltd.

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Interactive power system data preparation and verification using a pc‐editor

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European Transactions on electrical Power 1991年第3期1卷 149-152页

作者： Linke, K. Rumpel, D. Dip1.-Ing. Klaus Linke (1939) VDEis the director of the department "load dispatching and network operation" of Vereinigte Elektrizitatswerke Westfalen AG (VEW). DortmundGermany. After the study of electrical engineering at the Technical University of KarlsruhdGermany he started his professional career in an engineering-concern where he was responsible among others for investigations concerning the installation of process-computers in chemical plants. In 1968 he changed to VEW. Here in 1984 he took over his present position in which he is mainly engaged with the tasks of the management of the HV and EHV network and the power system control together with the problems concerning network automation incident to it. (Vereinigte Elektrizitatswerke Westfalen AG Hauptverwaltung Rheinlanddamm 24 W-4600 Dortmund 1 T +49 23 114 38-42 41) 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 DiplAng. 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. (Universiiit-GHDuisburg Fachbereich Elektrotechnik PF 10 15 03 W-4100 Duisburg T 4 9 20 313 79-34 37)

For computerized power system operation, all objects of the network must be mapped in a data‐model. For this task, the „Grid Data Language” (GDL) does not apply format‐bound source data, but describes the objects using a format‐free source text. To handle such texts, an editing‐ and verification‐system was implemented. This paper reports its application when describing an extra‐high voltage network for use in a training simulator. In that way, the full content of a dispatcher EHV data‐model could be converted to GDL, requiring a work of 15 to 20 man‐days. Copyright © 1991 John Wiley & Sons, Ltd.

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Workload redistribution for fault-tolerance in a hard real-time distributed computing system

Workload redistribution for fault-tolerance in a hard real-t...

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International Symposium on Fault-Tolerant Computing (FTCS)

作者： S. Balaji L. Jenkins L.M. Patnaik P.S. Goel Control Systems Division ISRO Satellite Centre Bangalore India Department of Electrical Engineering Indian Institute of Science Bangalore India Department of Computer Science & Automation Indian Institute of Science Bangalore India

In a hard real-time distributed computing system (HRTDCS), all the tasks are required to meet their associated deadlines; a task not meeting its deadline leads to a catastrophic failure of the system. The authors consider an HRTDCS that executes both periodic and aperiodic tasks associated with timing, precedence, and resource constraints. The fault-tolerance capability in such a system is achieved through the use of time redundancy. The problem of workload redistribution for fault tolerance in an HRTDCS is studied. A graph model to represent the system workload is developed. Three performance measures for the analysis of an HRTDCS are defined. A nonpreemptive scheduling algorithm is proposed to distribute the workload of the operational nodes of the HRTDCS in the presence of both hardware and task failures. This task allocation strategy is applied to a practical system, namely, the HRTDCS onboard a spacecraft. The performance measures obtained for a typical system workload indicate that the algorithm is quite suitable for an HRTDCS with regard to uniform workload distribution.< >

关键词： Fault tolerance Real time systems Distributed computing Timing Fault tolerant systems Redundancy Performance analysis Scheduling algorithm Hardware Space vehicles

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MPCS - THE MANUFACTURING PROCESS-control SYSTEM

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AT&T TECHNICAL JOURNAL 1986年第4期65卷 35-45页

作者： DUNIETZ, IS HSU, JLC MCEACHERN, MT STOCKING, JH SWARTZ, MA TROMBLY, RM The authors Irwin S. Dunietz John L.C. Hsu Michael T. McEachern James H. Stocking Mark A. Swartz andRodney M. Tromblyare responsible for design and development of the Manufacturing Process Control System. Mr. Dunietz joined AT&T in 1980. He is a member of the technical staff in the Manufacturing Information Automation department at AT&T Engineering Research Center Princeton New Jersey. He received an A.B. in mathematics from Cornell University and an M.S.E. in computer science from Princeton University. Mr. Hsu who joined AT&T in 1970 is a department head in the Manufacturing Information Automation department at the Engineering Research Center. He received an M.S. in electrical engineering from the University of Missouri. Mr. McEachern joined AT&T in 1962 and is a supervisor in the 5ESS™ Line Unit Manufacturing department at AT&T Technologies in Oklahoma City Oklahoma. He is responsible for the manufacturing process control center in Oklahoma City which provides computerized support for all circuit pack manufacturing. Mr. Stocking who joined AT&T in 1975 is a supervisor in the Manufacturing Information Automation department at the Engineering Research Center. He received a B.S. in chemical engineering from Rensselaer Polytechnic Institute and a Ph.D. in chemical engineering from the University of California Berkeley. Mr. Swartz joined AT&T in 1980 and is a member of the technical staff in the Manufacturing Information Automation department at the Engineering Research Center. He received an A.B. in computer science from Cornell University and an M.S. in computer science from Rutgers—The State University. Mr. Trombly who joined AT&T in 19 78 is an assistant manager at the AT&T Merrimack Valley Works in Massachusetts. Previously he was a supervisor at the Engineering Research Center. He holds a B.S. in computers and systems engineering and an M.S.E.E. from Rensselaer Polytechnic Institute.

The central challenge of all manufacturing is making products to the right standards and delivering them at the right time. AT&T is upgrading its corporate and factory resource planning systems to improve control of day-to-day manufacturing. The Manufacturing Process control System (MPCS), developed at the AT&T engineering Research Center (ERC), provides this support. MPCS connects the shop floor with production scheduling, accounting, product data archive, and engineering support systems.

关键词： PRODUCTION control

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The Impact of Microcomputers on Society

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IFAC Proceedings Volumes 1984年第2期17卷 3519-3519页

作者： Naresh K. Sinha T. Vamos Fred Marguiles Madan M. Gupta Department of Electrical and Computer Engineering McMaster University Hamilton Canada Computer & Automation Institute Budapest Hungary Vienna Technical University Vienna Austria Systems and Adaptive Control Laboratory University of Saskatchewan Saskatoon Canada

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OPTIMIZATION OF FEEDBACK-systems WITH CONSTRAINED INFORMATION-FLOW

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INTERNATIONAL JOURNAL OF systems SCIENCE 1981年第12期12卷 1459-1468页

作者： YANCHEVSKY, AE HIRVONEN, VJ Systems Theory Laboratory Helsinki University of Technology SF-02150 Espoo 15 Otaniemi Finland Division of Automation and Control Processes of Lcningrad Electrical Engineering Institute 197022 Russian Federation

Linear quadratic optimization problem of discrete time feedback systems with constrained feedback information flow is studied. Two cases of non-structural and structural feedback constraints are considered and corresponding optimal system synthesis procedures are derived. The approach presents a general solution to the problem of feasibleoptimal decentralized control systems synthesis with state feedbacks.

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Fault Diagnosis for Linear Discrete Time-Varying systems and Its Applications 1

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1000年

作者： Maiying Zhong Ting Xue Donghua Zhou Steven X. Ding

ISBN: (数字)9789811954382

ISBN: (纸本)9789811954375;9789811954405

This book focuses on fault diagnosis for linear discrete time-varying (LDTV) systems and its applications in modern engineering processes, with more weighting placed on the development of theory and methodologies. A comprehensive and systematic study on fault diagnosis for LDTV systems is provided, covering H∞-optimization-based fault diagnosis, H∞-filtering-based fault diagnosis, parity space-based fault diagnosis, Krein space technique-aided fault detection and fault estimation, and their typical applications in linear/nonlinear processes such as satellite attitude control systems and INS/GPS systems. This book benefits researchers, engineers, and graduate students in the fields of control engineering, electrical and electronic engineering, instrumentation science, and optoelectronic engineering.

关键词： control and systems Theory Mathematical and Computational engineering systems Theory, control

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Development and Testing of Vehicle Software and its Influence on Sustainable Transport 1

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1000年

作者： Antonio Colmenar-Santos David Borge-Diez Pedro-Miguel Ortega-Cabezas

The impact of driving efficiency on sustainable transport models is studied in detail, making proposals to be considered in the current environmental policies under discussion within the European Union in order to imp... 详细信息

ISBN: (数字)9783031476303

ISBN: (纸本)9783031476297;9783031476327

关键词： Automotive engineering Software engineering Transportation Technology and Traffic engineering Sustainable Development

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