Optimal Allocation of Distributed Generation Units Correlated With Fault Current Limiter Sites in Distribution Systems

Abstract

Integration of distributed generating (DGs) units helps in reducing the extreme loading on the main power grid. DGs are convoyed with high fault currents. High fault currents exceed the ratings of circuit breakers. This article proposes optimal allocation of different types of DGs units correlated with fault current limiters (FCLs) in single stage. The proposed method is assessed with two-stage approach that is carried out based on coyote optimization algorithm (COA) and electrical transient analyzer program (ETAP) at normal and faulty operating conditions, respectively. For this target, a fuzzy-based multiobjective (FBMO) formulation is proposed for enhancing the distribution system performance in both operating conditions. It aims at minimizing the power losses, reducing the fault currents in the network with economizing the installed FCLs sizes. To handle FBMO formulation, the COA has been employed to search for the optimal combination between DGs and FCLs. The proposed methodology is studied on IEEE 33-bus, 69-bus, and the Egyptian East Delta distribution systems. Acceptable power losses and fault level reduction are achieved for normal and faulty operating conditions. Therefore, the effectiveness and capability of the employed single stage for DG units correlated with FCLs allocation are proved compared with bistage approach.