基于改进D-S证据理论的变电站继电保护二次回路故障诊断方法研究

Research on Fault Diagnosis Method of Secondary Circuit of Substation Relay Protection Based on Improved D-S Evidence Theory

改进D-S证据理论基础上的智能变电站继电保护二次回路故障诊断方法,对故障元件集合中的各元件故障引发概率进行判断,从而进一步完成二次回路整体的故障判断。同时,基于D-S证据理论,能够有效解决证据冲突问题,保证计算结果符合逻辑。具体来说,基于D-S理论开展继电保护二次回路故障诊断工作时,需完成SCD文件的初始化解析,有效检测继电保护故障,应用虚回路通信状态和举证表获得故障元件集合信息,进一步判定可疑故障元件集合中的故障可信度,完成整个故障诊断过程。基于此,分析改进D-S证据理论应用的各项优势,进一步研究改进D-S的证据理论变电站继电保护二次回路故障诊断步骤。

Improved D-S evidence theory based on intelligent substation relay protection secondary circuit fault diagnosis method.It can judge the failure probability of each component in the fault element set,so as to complete the whole fault judgment of the secondary circuit.At the same time,based on D-S evidence theory,it can effectively solve the problem of evidentiary conflict.Ensure that the calculation results are logical.Specifically,when fault diagnosis of secondary circuit of relay protection is carried out based on D-S theory,it is necessary to complete the initial dissolving and analysis of SCD file,effectively detect the fault of relay protection,obtain the information of fault element set by applying the communication state of virtual loop and proof table,further determine the fault credibility of suspicious fault element set,and complete the whole fault diagnosis process.This paper analyzes the advantages of the application of improved D-S evidence theory and further studies the fault diagnosis steps of the secondary circuit of relay protection in substation.