Impact of distributed generator controllers on the coordination of overcurrent relays in microgrid

Authors : Niraj Kumar CHOUDHARY, Soumya Ranjan MOHANTY, Ravindra Kumar SINGH

Pages : 2674-2685

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In the presence of distributed generators insert ignore into journalissuearticles values(DGs); the fault current sensed by relay in the forward direction is larger than that in the reverse direction. Thus, it is required to have different relay settings for both forward and reverse directions. This paper investigates the impact of DG controller operating modes on the coordination of conventional and dual setting overcurrent relays insert ignore into journalissuearticles values(OCRs);. The different DG control modes are voltage control mode insert ignore into journalissuearticles values(VCM); and current control mode insert ignore into journalissuearticles values(CCM);. A comparative study of protection coordination is presented in both the operating modes of the DG. This scheme is tested on a 3-bus meshed system and the IEEE 34-node distribution system in which an electronically interfaced DG is connected. The protection coordination problem is formulated as a nonlinear programming problem and the optimal settings of OCRs are determined by using a genetic algorithm.
Keywords : Distributed generator, protection coordination, overcurrent relay, dual setting, controller, meshed system, voltage control mode, current control mode