基于Ucosφ和无功功率特征定位电网失步振荡中心的方法  

Method of positioning out-of-step oscillation center based on Ucosφ and reactive power characteristic

作　　者：胡永强[1] 杨玉倩[1] 赵书强[1] 梁慧媛[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2013年第5期36-41,共6页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司大电网重大专项资助项目(SGCC-MPLG019-2012)

摘　　要：传统失步振荡中心定位方法是在等值两机系统前提下基于单端就地电气量提出的,难以应对大电网的复杂多变。基于广域测量系统,提出一种定位复杂电网失步振荡中心的方法。首先以电流变化量作为失步启动判据,运用Ucosφ过零特征判定失步并确定振荡中心位置范围,继而利用无功功率特征准确定位失步中心所在线路。最后应用DIgSILENT仿真软件对新英格兰10机39节点系统进行了仿真,验证了该方法的可行性和准确性。Traditional method of positioning out-of-step oscillation center is proposed under the premise of the equiva-lent two-machine system, and it is based on the single-ended local electrical quantities, which is difficult to deal with the complex grid. Based on WAMS, this paper presents a method of positioning out-of-step oscillation center of complex grid. At first, it regards current variatit3n as start-up criterion of out-of-step, and then uses the zero-crossing feature of Ucosφ to confirm out-of-step of the system and the range of the oscillation center position. Next it uses the reactive power characteristics of out-of-step center to find the accurate position of out-of-step oscillation center. Finally it applies DIgSILENT to make a lot of simulation of the New England lO-unit 39-bus system, and the simulation examples verify the feasibility and accuracy of the method.

关 键 词：失步振荡 Ucosφ判据 无功功率特征 失步中心 

分 类 号：TM712[电气工程—电力系统及自动化]