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Coordinated fuzzy logic control between SVC and PSS to enhance stability of power systems

electrical engineering IN JAPAN 1996年第1期116卷 43-54页

作者： Kihara, H Hiyama, T Miyauchi, H Ortmeyer, TH Kumamoto University B.E. and M.S. degrees in Electrical Engineering from Kumamoto University in 1986 and 1988 respectively and is currently in the doctoral program at the university. In 1988 he joined Kyushu Electric Power Co. and is working in the Research Division. B.E. M.S. and Ph.D. degrees in Electrical Engineering from Kyoto University Japan in 1969 1971 and 1980 respectively. He joined Kumamoto University in 1971 and he has been a Professor of Electrical Engineering and Computer Science since 1989. During the period of June 1985 through September 1986 he was at Clarkson University and was involved with power system harmonics research. His current interests include intelligent control of electric power systems using fuzzy logic control scheme and neural network measurement and real time control of photovoltaic systems and harmonic analysis in distribution systems. He is a senior member of IEEE SICE of Japan and Japan Solar Energy Society. B.E. M.S. and Ph.D. degrees in Electrical Engineering from Kyoto University in 1981 1983 and 1991 respectively. He joined Kyoto University in 1985. Since 1993 he has been at Kumamoto University and currently is an Associate Professor of Electrical Engineering and Computer Science. His current interests include stabilizing control of electric power system and applications of the Superconducting Magnetic Energy Storage (SMES) to electric power systems. He is a member of IEEE and Institute of Systems Control and Information Engineers of Japan. B.S.E.E. degree in 1972 his M.S.E.E. degree in 1977 and Ph.D. degree in 1980 all from Iowa State University. From 1972 to 1976 he worked in the Operational Analysis Department Commonwealth Edison Company Chicago Illinois. Since 1979 he has been at Clarkson University Potsdam N.Y. where he is a Professor of Electrical Engineering. During the period of July 1993 to June 1994 he was also a Visiting Professor at Kumamoto University Kumamoto Japan. His current interests include harmonic performance po

This paper presents a new switching control scheme for static var compensator (SVC) using fuzzy logic control rules to enhance the overall stability of electric power systems. In addition, the coordination with power system stabilizers (PSS) is also considered to achieve a wider stable region. An SVC is set on one of the busbars in the transmission system, where the real power flow signal is utilized at the location of the SVC to determine the firing angle of the thyristor switch. The switching control scheme is simple so as not to require heavy computation on the microcomputer based switching controller. The PSSs are also set on the generators in the study system. Simulation results show the effectiveness of the proposed fuzzy logic switching control scheme for the SVC. The coordination between SVC and PSS is also effective to enlarge the stable region.

关键词： fuzzy logic control scheme real time control SVC PSS FACTS

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Time synchronization services aboard surface ships

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NAVAL ENGINEERS JOURNAL 1996年第6期108卷 73-84页

作者： ODonoghue, KF Marlow, DT Karen O'Donoghue is an electronics engineer working in the area of tactical networking at the Naval Surface Warfare Center Dahlgren Division. She holds B.S. and M.S. degrees in electrical engineering from Tennessee Technological University. Ms. O'Donoghue has nine years of experience working with communications and networking technology for the Navy. She has participated in Navy-wide network standardization efforts. She has also participated in national and international commercial standards activities including serving as technical editor. Currently she is working on time synchronization technology for the Aegis program. David Marlow is a group leader in the area of tactical networking at the Naval Surface Warfare Center Dahlgren Division. He holds B.S. and M.S. degrees in electrical engineering from Virginia Polytechnic Institute and State University. He has twenty-four years of experience working in various aspects of computer and networking technology for the Navy. He has served as technical lead for Navy-wide networking standardization efforts. He has also served as technical editor for a number of industry international networking standards of interest to the tactical Navy. Currently he is responsible for a variety of networking technology efforts for the Aegis program.

The modern day surface ship is composed of a number of individual systems which together operate the platform. Vital to making such a collection of systems work in this real-time environment is a common understanding of time. As additional functions and processors are added to systems, more demands are being placed on the time distribution function. Experience has shown that currently employed techniques for time distribution are not scalable to the more distributed approaches for building shipboard control systems. Use of Commercial-Off-The-Shelf (COTS) components also drives the need for new approaches to implementing time services. This paper presents requirements for time services, an overview of current time synchronization approaches, and a technical approach being investigated for future shipboard time synchronization.

关键词： Ships

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Book reviews

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Minds and Machines 1996年第2期6卷 239-285页

作者： Abbott, Barbara Herskovits, Annette Peterson, Philip L. Mele, Alfred R. Cole, David J. Crevier, Daniel Pelletier, Francis Jeffry Berkeley, Istvan S. N. Kitts, Brendan J. Brown, Mike Paliouras, George Department of Linguistics and Languages Michigan State University East Lansing USA Department of Philosophy Michigan State University East Lansing USA Program in Applied Linguistics Boston University Boston USA Department of Philosophy Syracuse University Syracuse USA Department of Philosophy Davidson College Davidson USA Department of Philosophy University of Minnesota Duluth USA Department of Electrical Engineering École de Technologie Supérieure Université du Québec Montréal Canada Department of Philosophy University of Alberta Edmonton Canada Department of Computing Science University of Alberta Edmonton Canada Biological Computation Project University of Alberta Edmonton Canada Center for Complex Systems Brandeis University Waltham USA Department of Computer Science University of Manchester Manchester U.K.

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Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

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Problem resolution during life cycle maintenance: A case study

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NAVAL ENGINEERS JOURNAL 1996年第3期108卷 171-177页

作者： Kerchner, RJ Bailey, J McCarthy, M Seegal, RH Warpinski, J Wilson, J Robert Kerchner:is currently working as a senior test engineer on the Surface Ship Torpedo Defense System and the AN/SQQ-89 ASW Combat System for Signal Corporation. Previously he was working as a system test engineer on the AN/SQQ-89 and AN/BSY-2 Combat Systems for GE Aerospace based in Syracuse N. Y. He received his B.S. degree in Physics from Westminster College. John Bailey:is currently working as a software engineer for the Multi-Sensor Torpedo Recognition and Alertment Processor and the AN/SQS-53C subsystem for Westinghouse Electric Corp. Previously he was working as an electrical engineer on the Longbow and APG-66 Mid Life Update programs. He received his B.S. degree in Electrical Engineering degree from Virginia Tech in 1987. He is currently working on his M.S. degree in Computer Science at Johns Hopkins University. Mike McCarthy:is currently working as a system test engineer for the passive subsystem COTS replacement for the AN/SQS-53C. Previously he was working as a system test engineer developing integration and functional tests for the MK116 Mod 7 and AN/SQS-53C subsystems for GE Aerospace based in Syracuse N. Y. He received his B.S. degree in Electrical & Computer Engineering from Clarkson University. Bob Seegal:is currently working as a systems engineer for the AN/SQQ-89 Combat System for Westinghouse Electric Corp. He has spent the past thirty years as a systems engineer working on various active and passive sonars which include the BQS-6 SQS-56 SQQ-32 and AN/SQS-53C systems. He received his B.S. degree in Applied Math from Brown University and an M.A. degree in Physics from Columbia University. Jeanne Warpinski:is currently working as a lead software engineer for the AN/SQQ-89 Combat System at the Naval Undersea Warfare Center at New London CT. She has spent the last ten years as a software engineer and configuration management specialist for the AN/SQR-19 AN/SQQ-28 and AN/SQS-53C subsystems. She received her B.S. degree in Computer Science from the University of Wisconsin. Jerry Wilson:is c

This paper is a case study of how problem resolution can operate in the life cycle maintenance stage of a large tactical sonar system. Here, the system design agent is not the original designer, so the principles of operation, hardware and software architecture, and test tools need to be learned. To deal with this challenge, the system design agent evolved a team approach that integrates the talents of a program manager, a system engineer, a test engineer, and a software engineer to analyze fleet problems. This team has proven effective at localizing problems for repair. Lessons are drawn to further improve maintenance efficiency.

关键词： Electronic ship equipment

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A correction to common advice given to young students

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INTERNATIONAL JOURNAL OF electrical engineering EDUCATION 1995年第4期32卷 366-367页

作者： Gluskin, E Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer-Sheva Israel and The Electrical Engineering Program The College of Judea and Samaria Ariel Israel

The usual advice given to a first year student is that while the student is reading lectures notes or working with a textbook at home, he has to try to perform the derivations on his own, and even to try to first find his own way to solve the problem example, and only after that to study these details in the source. It is thought, reasonably, that in this way, the study will be effective and the student will acquire good comprehension and obtain new tools which could then be actively used. However, this advice is only a part of more complete and self-consistent advice. This paper presents more complete advice which consists of three parts, of which the first is the advice already considered.

关键词： engineering education

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All-Fiber Image-Rejection Receiver Front-End for Optical Communication Systems Using High-Birefringence and Polarizing Fibers

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Optical Fiber Technology 1995年第3期1卷 247-263页

作者： Chandra, Nilanjan Daut, David G. Department of Electrical and Computer Engineering Fiber Optics Materials Research Program Rutgers University Piscataway NJ 08855-0909 P.O. Box 909 United States

In this paper, we investigate in detail the conditions necessary for proper image-rejection operation and characterize the performance of a single detector, all-optical image-rejection mixer for use in heterodyne receivers. The principal component of the all-optical image-rejection receiver is a length of high-birefringence fiber. A polarizing fiber is also considered as an alternative to the high-birefringence fiber. The image-rejection performance is based on meeting certain required ideal conditions for polarization states of the desired and image channels. To study this, we examine, using the Stokes parameter approach, the evolution of certain figures of merit with distance in single-mode high-birefringence and polarizing fibers. Due to the nearness of the frequencies of the desired, image, and local oscillator (LO) signals, the mismatches from the ideal conditions are very small compared to the beat lengths. Therefore, there is negligible receiver error rate performance degradation. Our results indicate that this all-optical image-rejection receiver implementation is a robust device that is also highly insensitive to temperature variations. © 1995 Academic Press, Inc.

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A 590,000 transistor 48,000 pixel, contrast sensitive, edge enhancing, CMOS imager-silicon retina 16

A 590,000 transistor 48,000 pixel, contrast sensitive, edge ...

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16th Conference on Advanced Research in VLSI, ARVLSI 1995

作者： Andreou, A.G. Boahen, K.A. Department of Electrical and Computer Engineering Johns Hopkins University BaltimoreMD21218 United States CNS Program Caltech PasadenaCA91125 United States

We present an experimental analog VLSI focal plane processor for the phototransduction, local gain control and edge enhancement of natural images. The single chip system incorporates 590,000 transistors in 48,000 pixels, and it has been fabricated on a 9.5×9.3 mm die in a 1.2 μm n-well double metal, double poly, digital oriented CMOS technology. The organization of the system abstracts from the structure and function of the vertebrate distal retina. The adopted design style, current-mode subthreshold CMOS using circuits of minimal complexity offers the possibility of ultra low power dissipation and area efficiency, commensurate with VLSI integration. © 1995 IEEE.

关键词： Pixels

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An algorithm for computation of state variable feedback gain

An algorithm for computation of state variable feedback gain

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IEEE International Symposium on Intelligent Control (ISIC)

作者： O. Ansary Electrical and Computer Engineering Technology Program Pennsylvania State University Middletown PA USA

In this paper an algorithm for computing the state variable feedback gain is presented. The proposed algorithm is developed in the context of a generalized state feedback controller design method that exhibits a compu... 详细信息

关键词： State feedback Gain Equations Control systems Eigenvalues and eigenfunctions Algorithm design and analysis Polynomials Electric variables control Design methodology Transient response

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Combined diagonal/Fourier preconditioning methods for image reconstruction in emission tomography

Combined diagonal/Fourier preconditioning methods for image ...

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IEEE International Conference on Image Processing

作者： S.D. Booth J.A. Fessler Bioengineering Program and Department of Electrical Engineering and Computer Science University of Michigan MI USA

Iterative methods for tomographic image reconstruction often converge slowly. Preconditioning methods can often accelerate gradient-based iterations. Previous preconditioning methods for PET reconstruction have used either diagonal or Fourier-based preconditioners. Fourier-based preconditioners are well suited to problems with near-circulant Hessian matrices. However, due to the nonuniform Poisson noise variance in PET, the circulant approximation to the Hessian is suboptimal. This paper shows that a particular combined diagonal/Fourier preconditioner yields a more accurate approximation to the Hessian and gives significantly faster convergence rates than does either preconditioner used alone.

关键词： Image reconstruction Tomography Character generation Symmetric matrices Equations Iterative methods Minimization methods Covariance matrix Spatial resolution Yield estimation

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