Prediction of Instability Separation Modes and Its Application in Practical Dynamic Security Region  

作　　者：曾沅 余贻鑫 王红梅 闵亮 张沛 LEES T 

机构地区：[1]Key Laboratory of Power System Simulation and Control of Ministry of Education, Tianjin University [2]Electrical Power Research Institute

出　　处：《Transactions of Tianjin University》2007年第3期157-162,共6页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China (No.50595413);Special Fund of the National Fundamental Research of China(No.2004CB217904);US EPRI under Agreement EP-P29464/C9966;Foundation for the Author of National Excellent Doctoral Disserta-tion (No.200439);Key Project of Ministry of Education of China(No.105047);Program for New Century Excellent Talents in University,Fok Ying Tung Education Foundation (No.104019);Innovation Fund of Tianjin Municipal (2006-09)

摘　　要：The transient critical boundary of dynamic security region (DSR) can be approximated by a few hyper planes correlated with instability separation modes. A method to fast predict instability separation modes is proposed for DSR calculation in power injection space. The method identifies coherent generation groups by the developed K-medoids algorithm, taking a similarity matrix derived from the reachability Grammian as the index. As an experimental result, reachability Grammian matrices under local injections are approximately invariant. It indicates that the generator coherency identifications are nearly consistent for different injections. Then instability separation modes can be predicted at the normal operating point, while average initial acceleration is considered as the measure of the critical generator group to amend the error. Moreover, based on these predicted instability separation modes, a critical point search strategy for DSR calculation is illustrated in the reduced injection space of the critical generators. The proposed method was evaluated using New England Test System, and the computation accuracy and speed in determining the practical DSR were improved.The transient critical boundary of dynamic security region （DSR） can be approximated by a few hyper planes correlated with instability separation modes. A method to fast predict instability separation modes is proposed for DSR calculation in power injection space. The method identifies coherent generation groups by the developed K-medoids algorithm, taking a similarity matrix derived from the reachability Grammian as the index. As an experimental result, reachability Grammian matrices under local injections are approximately invariant. It indicates that the generator coherency identifications are nearly consistent for different injections. Then instability separation modes can be predicted at the normal operating point, while average initial acceleration is considered as the measure of the critical generator group to amend the error. Moreover, based on these predicted instability separation modes, a critical point search strategy for DSR calculation is illustrated in the reduced injection space of the critical generators. The proposed method was evaluated using New England Test System, and the computation accuracy and speed in determining the practical DSR were improved.

关 键 词：instability separation mode dynamic security region K-medoids algorithm reachability Grammian 

分 类 号：TM711[电气工程—电力系统及自动化]