励磁参数对奇异诱导分岔的影响  

Effects of Excitation Parameters on Singularity Induced Bifurcation

作　　者：周晓渊[1] 邱家驹[1] 周宏[2] 谢志棠[3] 

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]华中电网有限公司,武汉430072 [3]香港理工大学电机系

出　　处：《高电压技术》2006年第4期13-14,18,共3页High Voltage Engineering

摘　　要：针对一单机—单负荷简单系统,利用分岔理论探讨了励磁放大倍数、电压控制点和励磁顶值等励磁参数对奇异诱导分岔点的影响。分析表明:提高励磁放大倍数、将控制点向系统侧推动能有效推后奇异诱导分岔的发生,提高系统稳定边界。计及励磁顶值后,系统稳定域可大大缩小。如果P—U曲线上半支遭遇励磁顶值,系统在发生奇异诱导分岔前不再经历Hopf分岔,励磁顶值的数值对系统动态行为有较大影响,其值较低时系统不会出现奇异诱导分岔。Local bifurcation analysis of a power system operation point results in three major bifurcations： Saddle Node Bifurcation （ SNB）, Hopf Bifurcation （HB） and Singularity Induced Bifurcation （SIB）, which determines the stability limit of the system. In fact, a singularity induced bifurcation is a typical occurrence in any differential-algebraic model when parameters are varied. In some cases, SIB will happen before a SNB or Hopf Bifurcation happens. That is, to get a more accurate estimation of stability boundary, further investigation on SIB is worthy. It is well recognized that excitation control play an important role in power system stability, but there seems to be few articles to study the effects of excitation control on SIB by now. The aim of this paper is to get some results to obtain insight of the problem. This paper investigates effects of excitation control on power system singularity induced bifurcation. The main purpose of this paper is to find relations between some control parameters, such as excitation gain K,, excitation limit and voltage control point （ represented by a） and the location of SIB of the system. Based on bifurcation theory, a ＂single machine-constant power load＂ power system is studied. First it is shown that to increase excitergain, or to push the voltage control point to load side can improve power system stability margin. Secondary, with the consideration of excitation limit, the stability margin will be reduced, the value of excitation limit plays an important role in system dynamic behavior. SIB may not occur under a low value of excitation limit.

关 键 词：电压稳定 奇异诱导分岔 单机-恒功率负荷系统 励磁参数 励磁顶值 

分 类 号：TM712[电气工程—电力系统及自动化]