一种改进的电网故障诊断解析模型

电网故障过程中保护和断路器动作及告警信息的不确定性,使原有的电网故障诊断完全解析模型存在多解和误诊,因此本文通过解析保护和断路器动作以及告警信息的不确定性,构建一种电网故障诊断的改进解析模型.该模型利用保护和断路器的误动与拒动概率以及告警信息的漏报与误报概率,赋予保护和断路器不同权值,使模型更加合理.此外,通过解析故障过程中保护和断路器的动作状态,降低模型中待求变量的维数.算例仿真结果表明本文方法有效,诊断结果唯一.

An Improved Analytical Model for Fault Diagnosis of Power Systems

There exists uncertainty about whether protective relays(PRs) and circuit breakers(CBs) operate when a fault occurs， which will result in the wrong solution and multiple solution for fault diagnosis based on the existing complete analytical models of power systems. By analyzing the uncertainty about PRs action， CBs action， and alarm， an improved complete analytical model was proposed. According to the probabilities of uncertain events mentioned above， different weight factors were assigned to various PRs and CBs for making the model more reasonable. At the same time， by analyzing action states of PRs and CBs， the dimensions of variables in this model were reduced. The cases of fault diagnosis verified the validity of the proposed method.