电力系统暂态稳定概率计算

Computation Algorithm for Transient Stable Probability in Power Systems

本文首先对扩展等面积法（ＥＥＡＣ）进行了推广研究，使之能处理多重操作时的第一、第二摇摆问题，以适应实际应用之需。文中着重分析了暂态稳定概率计算的特点，并根据这些特点以ＥＥＡＣ法为基础编制了相应的软件。用本软件计算暂态稳定概率，虽然要计算很多次稳定，但在计算过程中，潮流（最费机时）只需计算一次，切除线路后压缩导纳矩阵只需计算Ｌ次（支路数）．而且故障时压缩导纳矩阵采用支路追加修改法形成，因此总的计算量并不很大。计算结果表明该软件能够适应应用需要。

he extended equal area criterion ( EEAC)has been extended to the cases with multiple operations,in which both first swing and second swing stable problem can be resolved.Based on analysing the characterisics of transient stable probability computation,a software has been developed.Although a mount of stability computations have to be made in the soft-ware ,but the power flow,which is most time consuming , is only computed once,the post fault admittance rnatrixes are somputed L times (line number),and the during fault admit-tance matrixed are formed with ading branch algorithm. Therefore,the software is timesav-ing and can meet the basic needs of electric power systems.