Electromagnetic transients in power systems

State Variables for Engineers State Variables ,for Engineers, Second Edition, by Paul M. DeRusso, Rob Jay Roy, Charles M. Close, Alan A. Desrochers. Published by Wiley Interscience, 605 Third Avenue, New York, New York, 10158-0012. ISBN 0471577952, 575 pages, price $64.95. This second edition of State Variables fo r Engineers is completely updated to reflect both the many changes in the field of systems and control and the fact that today’s first-year graduate students are well prepared in the background skills and techniques needed to handle this material. The book begins with an introduction to the basic concepts behind time domain techniques, comparisons between state variable feedback and classical output feedback, and a discussion of the concepts of observability and controllability. The authors stress the importance of studying matrices and linear spaces by offering state variable representations for continuous linear systems in matrix form along with the solution to the resulting linear matrix differential equation. This treatment demonstrates how these basic linear algebra tools are related to the state variable analysis of linear systems. This new edition retains thorough coverage of the eigenvalue-eigenvector problem from the first edition, as well as several chapters on state variables for continuous and discrete-time systems, now supplemented with additional material on observability and controllability. It also offers three entirely new chapters covering: Canonical forms for representing linear systems Observers and controllers Identification and estimation. Supplemented with appendices on basic matrix algebra and Z transforms. State Variables for Engineers, second edition, is an ideal text for courses in systems analysis and techniques. It is also a reference for professionals who want to keep pace with recent changes in the field. Electromagnetic Transients in Power Syste Electromagnetic Transients in Power Systems, by Pritindra Chowduri. Published by J. Wiley, 605 ThirdAvenue, New York, New York, 10158-0012. ISBN 0471957461, 400 pages, price $95. Lightning and switching surges are dominant and most frequent causes of power-system outages, which are costly because of loss of revenue and the need for repair or replacement of damaged equipment. The protection of electrical systems against the electromagnetic transients caused by lightning and switching surges is especially difficult because of the unpredictability of the transients and the principles of protection. Professor Chowdhuri presents these theories and principles in an up-to-date form. He includes topics rarely discussed in the past, such as lightning-induced voltage on power lines and the effects of transients on low-voltage systems; these topics are now of prime concern because of increasing demands for higher reliability in the electrical industry and increasing use of power semiconductor devices in the control of power. There are worked examples to illustrate all the topics. The book serves primarily the needs of two groups of readers: students who are formally learning in the classroom, and practicing engineers who, as lifelong students, need to keep abreast of new knowledge.