不可微环节对电力系统小扰动稳定域的影响  

Tentative Study on the Influence of Non-differential Components to Power System Small Signal Stability Region

作　　者：贾宏杰[1] 曹晓冬[1] 王泗宝 张勇[2] 

机构地区：[1]天津大学电力系统仿真控制教育部重点实验室,天津市300072 [2]绍兴电力局柯桥供电分局,浙江省绍兴市312030

出　　处：《电力系统自动化》2007年第8期7-11,89,共6页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217904);国家自然科学基金重大项目(50595413);全国优秀博士学位论文作者专项资金资助项目(200439);教育部科学技术研究重点项目(105047);新世纪优秀人才支持计划资助项目;天津市科技发展计划项目(06TXTJJC13700);霍英东教育基金会优选资助课题(104019)。~~

摘　　要：研究了不可微环节对电力系统小扰动稳定域(SSSR)的影响。首先给出一种利用分段函数描述连续但不可微环节的方法,将函数的不可微点转换为该解析式导数的极点。进一步利用该方法并借助一个简单的3节点系统,深入探讨了励磁顶值对系统小扰动稳定性和SSSR的影响。研究发现,励磁顶值会引起系统雅可比矩阵和主导特征值跳变,使系统产生新的Hopf分岔点(振荡模式);此外,励磁顶值上下限取值不同时,会导致SSSR内产生新的不稳定区域(空洞),并使SSSR的边界构成复杂化。In this paper, the author mainly focuses on the influence of non-differential components to power system small signal stability region （SSSR） study. An expressive method is firstly introduced to describe the piecewise, continuous function. It converts the non-differential points into some poles of the derivative function. The left-hand derivative limit and the right-hand derivative limit can be used to approximate the derivatives of such poles according to the requirement. Based on this method and a simple three-bus system, the impact of the exciter limit to power system small signal stability and SSSR is then deeply discussed. It is found that the exciter limit can change elements of the system Jacobian matrix so as to cause jumping of the system critical eigenvalue. New Hopf bifurcation and new oscillation mode can be triggered when exciter voltage hits its limitation. In addition, exciter limit can cause significant topological changes to the power system SSSR. e. g. exciter limit can cause new instability hole in the SSSR and make the region boundaries more complex.

关 键 词：不可微环节 小扰动稳定 分岔 励磁顶值 电力系统 

分 类 号：TM712[电气工程—电力系统及自动化]