基于DS证据理论的电网故障诊断系统的研究

Research of Fault Diagnosis System of Power Grid Based on DS Evidence Theory

针对基于单一判据的电网故障诊断系统存在较高误判率的问题,提出了一种基于DS证据理论的多判据融合决策的电网故障诊断系统的设计方案。该方案采用基于量值区分的门限法、基于电流差动的门限法、基于功率方向的门限法三种判据方法对同一段故障录波数据进行判别,应用DS证据理论融合判别结果,从而可准确判断故障类型和故障位置。实例分析表明,该方案可有效提高电网故障诊断的准确率。

In view of problem of higher misdiagnosis rate in fault diagnosis system of power grid based on single criterion, the paper proposed a design scheme of fault diagnosis system of power grid with multicriterion fusion decision based on DS evidence theory. The scheme uses three criterion methods of threshold method based on value distinguishing, threshold method based on current differential and threshold method based on power direction to judge a section of data of fault recorder, and makes fusion for judging results by use of DS evidence theory, so as to judge fault type and fault position accurately. The example analysis showed that the scheme can improve accuracy of fault diagnosis of power grid effectively.