发电机无功极限诱导分岔的机理分析及预防策略  

Mechanism Analysis and Preventive Measures Investigation of Generator Reactive Power Limit Induced Bifurcation

作　　者：陈磊[1] 闵勇[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2008年第10期14-19,共6页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费项目(2004CB217904);国家自然科学基金重点项目(50323002)~~

摘　　要：研究由于发电机励磁电压限制导致的极限诱导分岔,发现临界限值的存在并提出一种极限诱导分岔的机理解释。当极限大于临界限值时,系统遇到极限才发生极限诱导分岔。计算临界限值及其对参数的灵敏度,根据灵敏度信息,可通过调整参数消除极限诱导分岔。提出一种极限诱导分岔的机理解释,即极限诱导分岔反映了动态无功源在维持系统电压稳定性中的重要性。并利用该机理对临界限值及灵敏度结果进行分析。研究静态无功源对极限诱导分岔的影响。静态的电容器补偿虽能增加负荷裕度,但加大了系统电压稳定对动态无功源发电机的依赖性,系统更容易发生极限诱导分岔。Limit induced bifurcation（LIB） by generator excitation voltage limit was studied, the critical limit was presented and a mechanism of LIB was proposed. LIB only occurs when the limit is greater than a critical limit. Its sensitivities with respect to parameters were computed, from which a method of preventive control to LIB was derived. LIB can be eliminated by adjusting parameters according to the sensitivities. A new mechanism of LIB was proposed. LIB actually reflects the importance of the dynamic reactive source in maintaining voltage stability. The results of critical limit and sensitivities were analyzed with the mechanism. The influence of static reactive sources on LIB was studied. Static capacitor compensation increases the dependence of voltage stability on dynamic reactive source and can result in the occurrence of LIB.

关 键 词：电力系统 电压稳定 极限诱导分岔 无功极限 临界限值 动态无功源 

分 类 号：TM712[电气工程—电力系统及自动化]