基于电流安全裕度状态空间截断的可靠性算法  

A Power System Reliability Evaluation Algorithm Based on Safety Margin of Current State Space Pruning

作　　者：万官泉[1] 汪穗峰[1] 张尧[2] 戴保明 吴国沛[1] 

机构地区：[1]广州供电局,广东省广州市510620 [2]华南理工大学电力学院,广东省广州市510640

出　　处：《电力系统自动化》2008年第5期34-37,共4页Automation of Electric Power Systems

基　　金：国家自然科学基金重点项目(50337010);广东电网公司科技合作项目

摘　　要：给出了一种快速计算紧急状态下线路电流的方法,引入线路电流安全裕度指标,利用该指标来辨识跳闸线路的关键影响线路和预测系统可能发生的多重故障事件,并在此基础上提出基于线路电流安全裕度的系统状态空间截断可靠性算法。该算法将线路跳闸后安全裕度较小的故障事件筛选出来,能有效截断系统故障状态空间,协调事件可靠性分析在计算速度和精度上的矛盾。应用表明,该方法不但能有效进行事件可靠性的影响与截断分析,还能反映出系统可靠性指标与线路电流安全裕度的变化关系,找出系统发生大规模故障的临界线路电流安全裕度,为防止大停电事故的发生提供决策参考。In a bulk power system, cascading failures initiated by branch open events often lead to blackout. So, it is definitely necessary to make an event reliability analysis in an emergency. A kind of line current fast calculating method in an emergency and the safety margin index of line current are described. These indices are used to identify the key lines affected by the tripping line and forecast system multiple failure events. Based on the above considerations, the reliability evaluation algorithm using state pruning by the margin of safety is proposed and the margin of safety indices are applied to screening the failure event with a small safety margin. It can effectively prune system failure state space and harmonize the conflict between speed and precision of the event reliability analysis. Application shows that the method proposed can not only effectively perform influencing and pruning analysis of event reliability, but also reflect the relation of variation of system indices with the safety margin of line current. The critical value of safety margin in relation to the risk of cascading failure can be obtained, providing decisionmaking reference for preventing the occurrence of blackout.

关 键 词：安全裕度 状态截断 电力系统可靠性 算法 

分 类 号：TM732[电气工程—电力系统及自动化]