Research On Search Method Of Power Grid Cascading Failures Mode

In a complex power grid, cascading failures that are triggered by some smalldisturbances can induce global catastrophic effects over the entire network. On the basis ofmaking the concrete analysis of some large-scale blackouts both at home and abroad, thearticle summarizes concrete cascading incident development model and the universal law oflarge-scale blackout development, and puts forward the new reliability indexes according tothe needs of cascading failures analysis. In order to realize the comprehensive predictivesearch of cascading failures of the power grid, the paper puts forward the circulatingperfectible search mode, and gets the search results of cascading failures in the form of faultchain figure of tree structure, which are input the collection of cascading failures. It caneasily obtain minimal cut sets and their probabilities and the probability of the cascadingfailures caused by initial fault and important degrees of minimal cut sets, which can reflectthe weak link of power grid. In addition, in order to avoid the problem of " the curse of chain", the paper introduces the fuzzy theory to reduce the number of fault chain figure of treestructure. Calculation example demonstrates that these methods have a good value toanalyze cascading failures.