具有冗余保护的变电站模糊Petri网故障诊断

针对750kV变电站的双网双重保护配置特点及保护装置、断路器存在的误动和拒动等不确定性情况,提出一种基于冗余保护的变电站模糊Petri网故障诊断方法。在该方法中利用双重保护装置的信息对元件诊断模型进行冗余知识表示,依据电网拓扑结构和保护配置等形成规则约束,在此基础上建立了故障元件的模糊Petri网冗余诊断模型,并将其分为主网和冗余网两个子网模型。在模型中采用信息熵确定初始信息的可信度,通过模糊推理获得最小故障诊断结果集。仿真结果表明了该方法的有效性。

Fault Diagnosis for Substations with Redundant Protection Based on Fuzzy Petri Net

In view of the 750 kV substation characteristics such as double net, dual protective configuration and the uncertainty of maloperation and rejection to operate, a fault diagnosing method for substations with redundant protection configuration based on fuzzy Petri net (FPN) is proposed. In this method, the redundant knowledge of the component diagnosis model is represented using the information about two protective devices and the rule is established according to the grid topology structure and the protective configuration. Based on this, the redundant diagnosis model based on FPN is developed and decomposed into two sub-models, the main and redundant model, in which the credibility of the initial information is determined by using the information-entropy while the minimal result-sets of fault diagnosis can be obtained through fuzzy reasoning. Results show the effectiveness of the proposed method.