输电网故障的与或树诊断模型

Model for And/Or Tree in Power System Fault Diagnosis

为进一步提高诊断算法的准确度及容错性,文中提出一种基于与或树模型的输电网故障诊断方案。在目前诊断模型的基础上加入保护启动信息及电网拓扑元素,使与或树诊断模型对故障的描述更加确切。通过对电网拓扑的搜索形成遍历生成树,反映出了可疑故障元件与断路器之间的连接关系,然后将保护启动信息、保护出口动作信息以及断路器跳闸信息三者形成的与树引入其中,形成最终的与或树诊断模型。通过对与或树的求解及最优匹配算法能够确定故障元件以及丢失的报警信息,最后通过故障诊断算例验证了该方法的有效性。

For further improvements on the efficiency and accuracy of fault diagnosis,a fault diagnosing method is proposed based on an and/or tree model.The and/or tree can describe a fault more exactly as the power grid topology and protection start-up messages are incorporated.The search tree is used to connect fault elements and circuit breakers which are obtained by the power grid topology.Then the and/or tree fault diagnosis model can be obtained when the or tree is substituted in.The or tree contains protection start-up messages,protection operation messages and circuit breaker trip off messages.The answer tree can judge the fault sections and optimum match algorithm can help find the missing alarm messages.Simulation results show that the proposed method can meet the requirements of practical applications.