A kind of multi-mode hidden fault risk analysis method of relay protection system

The invention belongs to relay protection of power system and venture analysis field, disclose a kind of multi-mode hidden fault risk analysis method of relay protection system, comprise the multi-mode hidden fault model setting up relay protection system; According to multi-mode hidden fault model, venture analysis is carried out to the electrical network N-k fault caused by relay protection hidden fault, obtain the risk indicator value of relay protection system hidden fault.The present invention carries out simplification modeling analysis to the hidden fault of protection system; Analyze the hidden failures feature of typical module not of the same race, set up the hidden fault model of various modes; For the venture analysis problem of hidden fault, a kind of electrical network N-k failure analysis methods is proposed.Have employed the N-k probability of malfunction method for solving based on improving function ingredients solution and event tree analysis analysis method in analysis, and establish corresponding cascading failure risk indicator; Improve the accuracy in computation of electrical network N-k probability of malfunction, risk-assessment can be carried out to the hidden fault of relay protection system.