Identification and reduction of impact of islanding using hybrid method with Distributed Generation

In this paper a hybrid method is proposed to reduce the impact of islanding in the presence of Distributed Generation (DG). The issue of islanding is critical in the distribution system as the non- detection of islanding may lead to the collapse of the system. The islanding is prominent due to the increased penetration levels of DG in the network. In the proposed method, first the placement of DG is performed using a two stage Genetic Algorithm (GA), by dividing the system into zones, to improve the overall voltage profile and to reduce the active power losses. The two stage optimization ensures a faster convergence of results and better quality of solutions. The bus vulnerable for islanding is identified using a hybrid approach combining the existing active and passive methods islanding. The proposed scheme is tested on IEEE 33 and 69 bus radial systems and the results obtained show the effectiveness of the method.