Using Integrated Method to Rank the Power System Contingency

Contingency ranking is one of the most important stages in the analysis of power system security. In this paper, an integrated algorithm has been proposed to address this issue. This algorithm employs neural networks method to fast-estimate the power system parameters and stochastic frontier analysis (SFA) in order to calculate the efficiency of each contingency. Network security indices (voltage violation and line flow violation indices) and economic indices (locational marginal price and congestion cost indices) have been simultaneously considered to rank the contingencies. The efficiency of each contingency shows its severity and indicates that it affects network security and economic indices concurrently. The proposed algorithm has been tested on IEEE 14-bus and 30-bus test power systems. Simulation results show the high efficiency of the algorithm.Test results indicate that predicted quantities are estimated accurately and quickly. The proposed method is capable of producing fast and accurate network security indices and economic indices, so it can be used for online ranking.