考虑多类故障假说变量的配电系统故障诊断方法研究

Fault Diagnosis Method for Distribution System Considering Multitype Failure Hypothesis Variables

在配电系统故障诊断中,通常只将区段状态作为故障假说变量,在配电节点发生多点信息漏报和误报时则不能准确定位故障,为此,提出一种考虑多类故障假说变量的故障诊断方法。将节点的漏报和误报与区段状态一起作为诊断的故障假说变量,为此导致变量维度过大,于是将故障矛盾假设作为目标函数的约束条件以达到降低变量维度的目的。考虑多类故障假说变量的故障诊断方法不仅能够极大提高配电系统故障定位的准确率和容错能力,还能同步获取FTU(Feeder Terminal Units)节点漏报和误报的警告信息。通过算例分析,验证了所提诊断方法配电系统故障诊断中的优势。

In the fault diagnosis of distribution system, only the section state is used as the fault hypothesis variable, but the fault can not be accurately located when the multi- point information is missed or misreported. For this reason, the paper proposes a fault diagnosis method considering multi-type fault hypothesis variables. In order to reduce the dimension of the fault hypothesis, the fault contradiction hypothesis is taken as the constraint condition of the objective function. The fault diagnosis method considering multiple kinds of fault hypothesis variables can not only greatly improve the accuracy and fault tolerance of the distribution system fault location, but also obtain warning information synchronously of FTU node with both missed and false alarm. The advantages of the proposed diagnostic method in the distribution system fault diagnosis are verified by an example.