Contingency ranking by analyzing System Available Transfer Capacity

Abstract

This paper proposes two approaches for ranking of line outages and generator outages contingencies in combined pool/bilateral dispatch with estimation of a “System-wide" Available Transfer Capability (SATC). The first method tries to define the worst case contingency by computing MWM decrease percent, while the second approach determining the lowest SATC value whose magnitude indicate which line outages maximally affect the total transaction level and system security. By using this approach we need to solve reduced number of OPF problems only associated with worst contingency cases according to continuation power flow those having lowest SATC value. The study has been carried out on modified IEEE 14 Bus system using MATLAB and results are presented.