Effect of Change in Environmental Factors on Coordination of Overcurrent Relays with DG Integration

With the increase in Distributed Generation (DG) in distribution systems to maintain the reliability of the supply, there occurs problem of relay coordination. Therefore, it has become important to address this issue as it has become a big challenge for the power system protection engineers. With the incorporation of DG, the radial nature of distribution system is lost and short circuit level is also increased therefore, it leads to maloperation of relays as the previous settings of the relays needs to change. The goal of this paper is to address the issue of relay coordination at different wind speeds encountered by wind turbine. GA and PSO optimization techniques are applied to achieve optimum coordination of over-current relays in a three bus system with a detailed model of wind used as Distributed Generation. MATLAB and SIMULINK have been used for all programming and simulation requirements.