Abstract

Contingency screening and ranking are one of the most important issues for security
assessment in the field of power system operation. The objective of contingency ranking is to
quickly and accurately select a shortlist of critical contingencies from a large list of potential
contingencies and rank them according to their severity. Then suitable preventive actions can be
implemented considering these contingencies that are likely to affect the power system
performance. In this paper, a novel approach is presented for contingency ranking based on static
security assessment (SSA). This method employs a weighted performance index with the application
of Fuzzy Logic-based Analytical Hierarchy Process (FLAHP) in order to select appropriate
weighting factors to be imposed. The proposed method is applied to the IEEE 30 bus system and the
results are presented.