Comparison of Load Shedding Methods for Mitigating FIDVR

Abstract

Fault-induced delayed voltage recovery (FIDVR) occurs after a fault in a network with high penetration of induction motor (IM) loads. Load shedding (LS) is one of the appropriate methods to reduce the destructive effects of FIDVR on the network, and for this reason, the authors have previously presented three LS methods to deal with FIDVR. The first method uses the index of IM loads’ power change. The second method is an optimization problem and the third method introduces indicators based on sensitivity analysis to find the location and amount of LS. The purpose of this paper is to examine the strengths and weaknesses of those three methods, and to determine each of these methods is suitable for use in what specific conditions. The proposed methods obtain less LS amounts, also, the number of LS locations and moments of proposed methods are fewer than previous ones. However, these methods have different execution times which are related to the speed of utilized processor, and a suitable method to deal with FIDVR must have the ability to shed the load in the initial moments of this phenomenon.