A fast online load shedding method for mitigating FIDVR based on novel stability index

This paper presents an online fast load shedding method for mitigating Fault-Induce Delayed Voltage Recovery (FIDVR), using a new stability index. After fault clearing in a power system, the voltage may remain in lower levels for some seconds, which may result in voltage collapse in severe cases. In this paper, a new index, to identify instability, is presented, based on induction motor model. Instead of using voltage amplitude as a stability indicator, the proposed method applies a centralized scheme, using new the index. The new load shedding algorithm is applied to a practical test system in order to verify the proposed stability index and load shedding methodology. Simulations show the effectiveness of proposed method in decreasing the voltage recovery time.