Research on distribution network security analysis based on K(N-1+k) criterion and rank preference optimal ordering

The objective of security analysis is to find the weak link of distribution network. the k(n-1+k) criterion based on the characteristics of distribution network was proposed for distribution network security analysis. according to the k(n-1+k) criterion,the electrical devices in the contingency set can be classified into two kinds. the first kind meets the requirement of the k(n-1+k) criterion. the rank preference optimal ordering (rpoo) was proposed to evaluate the damage degree of power system. the second kind does not meet the requirement of the k(n-1+k) criterion,and it is the weak link of distribution network. a numerical experiment shows that the method is efficient and feasible,and the proposed method can provide assistant decision-making for safety precautions. © 2014 wang zengping et al.