电力系统暂态稳定域近似边界可信域及其扩展  

Credible Region and Its Extension for Approximate Boundaries of Transient Stability Region in Power System

作　　者：刘辉[1] 闵勇[1] 张毅威[1] 侯凯元[2] 王开鹏[1] 陈磊[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 [2]东北电网有限公司,辽宁省沈阳市110006

出　　处：《中国电机工程学报》2008年第31期9-14,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2004CB217904);国家自然科学基金重点项目(50323002)。~~

摘　　要：电力系统稳定域边界的逼近一直是应用直接法进行电力系统暂态稳定分析的难点。该文给出一种基于可信域和暂态能量函数的边界近似方法,该方法利用特征不变流形(characteristic invariant manifolds,CIMs)确定的可信域和其边界上故障轨迹相关方向处暂态能量函数常值能量面的并集确定近似边界。采用该方法对WSCC4机11节点标准测试系统稳定域边界进行逼近,并依据近似稳定域边界估计临界清除时间。通过对采用纯多项式近似的边界及与采用纯能量函数近似边界的比较,表明该方法即排除了多项式近似边界收敛域外的不确定性,又在很大程度上克服了传统能量函数近似边界的保守性,提高了直接法分析电力系统暂态稳定的精度。Boundary approximation of attraction region is important to the application of direct methods to power system transient stability analysis. The study of credible region using characteristic invariant manifolds （CIMs） is an efficient approach to estimate the valid range of the approximate boundary. This paper presents a novel method to approximate the boundary based on the credible region and the transient energy function （TEF）. The stability boundary is shown to consist of the union of the credible region and the constant energy surface at the point on the boundary of the credible region in the direction of the fault-on trajectory. With the WSCC 4-machine ll-bus test system, the stability boundaries are approximated by the proposed algorithm and accordingly the critical clearing time is calculated based on the approximated boundary. Compared with the traditional boundary approximated by the polynomial or TEF respectively, the proposed method not only eliminates the uncertainty out of the convergence region of the polynomial approximation but also overcomes the conservation of TEF and enhances the accuracy of the direct methods.

关 键 词：电力系统 稳定边界 暂态能量函数 可信域 特征不变流形 

分 类 号：TM74[电气工程—电力系统及自动化]