Real-Time Stability in Power Systems

Abstract

, and holistic coverage of power systems. The Series comprises advanced textbooks, state-of-the-art titles, research monographs, professional books, and reference works related to the areas of electric power transmission and distribution, energy markets and regulation, electronic devices, electric machines and drives, computational techniques, and power converters and inverters. The Series features leading international scholars and researchers within authored books and edited compilations. All titles are peer reviewed prior to publication to ensure the highest quality content. Publishing -Switzerland 2006, 2014 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher's location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.Printed on acid-free paper PrefaceThe revised and updated version of the original Real-Time Stability in Power Systems is most timely, given the myriad changes in the electric power industry and the significant technology advances in computing, control and communications fields since its initial publication. Dr. Savulescu and his hand-picked group of experts have accomplished an impressive effort to provide in a single tome a comprehensive treatment of the power system real-time stability assessment area.While the physics of the power systems has not changed in the liberalized, competitive electricity market environment, within which they operate, the decision making process has undergone major transfo...

Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

“…Figure 2 shows the power angle curve for the operation system that discussed in Figure 1 for the two sources. At fault in the system, the amount of the output power will reduce, but the feedback control can't increase the mechanical torque to the rotor instantaneous [17] . Figure 6 shows the stable transient point of δ with transferring electric power P0 , this angle will change at the fault condition where the output power will reduce to PF, at this moment the generator rotor starts to accelerate the speed but the mechanical input not changed so the operation angle δ will be increase [18] .…”

“…So, the angle continues increase to δF. (Area-2) is the energy lost at deceleration its equal to the energy gained at acceleration in (Area-1) this is called equal area criterion [17,18] .…”

“…The power angle curve is shown in Figure 6. The system is operating at initial steady operating point A with Pmo as output power and δ0 as initial rotor angle [14][15][16][17][18][19][20] .…”

“…At the electrical center, angle between two sources is 180°. The existence of electrical center is an indication of system instability, the two generators now being out of step [17][18][19][20][21] .…”

“…So, the performances of distance elements at OOS conditions must be blocking the distance function in IEDs during stable power swings in the system. But the OST function should be considered to accomplish differentiation stable from unstable power swings, and separation to system areas at the predetermined network locations and at the appropriate source-voltage phase-angle difference between systems, in order to maintain power system stability and service continuity [14][15][16][17][18][19][20][21][22][23][24][25][26] .…”