An efficient voltage stability ranking using load shedding for stabilizing unstable contingencies

In this paper, an efficient voltage stability contingency ranking method without screening including unstable contingencies is proposed. The concept of the advanced power flow compensation is introduced for the fast N-1 contingency computation. The rapid derivation of the estimated necessary load shedding amount is also used for the voltage stability contingency ranking including unstable contingencies. The proposed ranking method can arrange contingency cases in descending order based on the severity of voltage stability index and the necessary load shedding amount for stabilizing unstable contingencies. The performance of the proposed ranking method is validated via the test calculations on a 6-bus model system and a 30-bus model system.