粗糙集结合Petri网的3/2接线变电站故障诊断研究

500kV及以上的变电站多采用3/2接线方式,其主接线结构和保护配置具有自身的特点.本文在分析了3/2接线系统保护动作策略的基础上,建立了故障诊断的初始决策表,并利用粗糙集的属性优选对该表进行最小约简,构建最优的Petri网模型,从而实现故障诊断.变电站故障诊断实例证明了该方法不仅能够准确诊断出3/2接线系统的故障元件,而且诊断速度快,容错性好.

Fault diagnosis of substation system using 3/2 connection mode based on rough sets and Petri net

The 500kV and above transformer substation systems always select the 3/2 connection mode,and this mode has its own characteristics at the structure of main connection and the disposition of protection.Firstly,this paper establishes the initial decision table of fault diagnosis after analyzing trip strategies of protection about the 3/2 connection system.Then the paper proposes a fault diagnosis method based on rough set and Petri nets.This method has three parts:to calculate the reduced attribute set by the rough set theory;to construct the Petri net model based on the rules from the reduced attribute set;and to diagnose the fault through parallel reasoning of Petri nets.Finally,the paper gives some tests of the fault diagnosis.The results show that this method can diagnose the fault localization of 3/2 connection mode accurately and it is good at the diagnosis speed and the fault tolerance.