基于知识表达的电网故障智能容错诊断技术

Intelligent Grid Breakdown Fault-tolerant Diagnosis Technology Based on Knowledge Representation

针对目前故障诊断方法难以实现告警报文缺失、混杂和设备状态不确定情况下的故障判断,提出了一套事故诊断知识表示模型,建立了电网一二次设备关联关系、设备状态和设备动作情况的知识表示方法。以此为基础结合谓词逻辑将事故后设备动作逻辑以规则形式进行表达,并通过对不同故障假说下的事故链推理,实现报文信息的校核和事故发展过程的重现。通过先验概率的计算得出最优故障判断结果。实际故障案例验证了方法的有效性。

Considering that the present fault diagnosis method can hardly realize fault diagnosis in the cases of missing/mixed alarm message or uncertain equipment state,a fault diagnosis knowledge representation model was presented,and a knowledge representation method was established for the association relationship between primary and secondary grid equipment,equipment state and equipment operation.Furthermore,the predicate logic was used in addition to express equipment action logic after the accident in a regular form,and message information check and recurrence of development process were realized through accident chain reasoning under different fault assumptions.The optimal fault diagnosis result was obtained through calculation of prior probability.The effectiveness of the proposed approach was verified through actual fault examples.