摘要
前文已证明，从多机积分空间到等值ＯＭＩＢ（单机无穷大系统）平面的ＰＣＯＩ（部分惯性中心）映射保留了原多机系统首摆稳定性的充要条件。本文进一步剖析了多机因素和复杂模型因素对映射ＯＭＩＢ系统各次摆动稳定性的影响，并将ＥＥＡＣ理论推广到多摆稳定性。本文还澄清了失稳模式和临界模式这两个不同的概念，探讨了失稳模式随故障的切除时间变化的机理；指出非理想的二群首摆失稳模式可能随故障切除时间而变，并可能存在更临界的多摆失稳模式。最后，揭示了由笔者发现的ＩＳＤ（孤立稳定区）及ＮＡＲＩ（由ＩＳＤ引起的邻域吸引子）现象的物理本质，从理论上证实当前普遍采用的逐步积分法有可能搜索到错误的ＣＣＴ（故障临界切除时间），而沿用至今的ＣＣＴ定义也是值得商榷的。在ＥＥＡＣ理论指导下，由电力部电力自动化研究院开发的ＩＥＥＡＣ（集成化ＥＥＡＣ）软件包有效地解决了上述连常规数值积分法也难以发现的问题。
A previous peper shows that in order to assess transient stability of a multimachine system, we can mapping its angle trajectories onto OMIB planes with the PCOI transformation and then examine the sta-bility of resulting time-varying OMIB systems,The present paper further dissects the influences of nonidealtwo-group dynamics and/or detailed models on the timevarying OMIBs , and augments the extended equalarea criterion(EEAC ) theory to multi-swing instability, The intrinsic link between instability modes andfault clearing time is uncovered. The revelation uf the ISD(solated stability domain ) and NARI(neighbor-hood attractor resulting from ISD ) phenomena gives a challenge to the regular practice on searching CCTwith numerical integration , and puts the widely accepted definition of CCt into question.
出处
《电力系统自动化》
EI
CSCD
北大核心
1994年第10期11-24,共14页
Automation of Electric Power Systems
关键词
暂态稳定
失稳模式
电力系统
transient stability multi-swing stability instability modes critical clearing time numericalintegration EEAC
