Power system contingency ranking using fast decoupled load flow method

Abstract

As power demand is increasing day to day life loading on present power system is also increasing. As a result voltage instability occurs with heavily loaded system. So power system security becomes one of the important aspect where operational engineers need to estimate the unseen contingency. So contingency screening and ranking is one of the important procedure for on line system security assessment. In this paper contingency screening and ranking is done by fast decoupled load flow by using performance index i.e., active power (PI p ) and voltage performance index(PI v ) for the line outage of the given power system. Ranking is based on overall performance index (PI) i.e., summation of active power performance index(PIp) and voltage performance index (PIv) the highest value of PI ranks first and proceeds in descending order for further ranking. The proposed work is simulated on IEEE 5 bus system on MATLAB environment.