Abstract

In today's electrical grid, micro grid concept employing Distributed Generation is being implemented rigorously. With change in penetration level of DG, distribution system experiences variation in the short circuit level of the system. Therefore the relay settings should be revised at every level. This paper discusses the application of Gravitational Search Algorithm to find optimal relay settings in order to attain coordination of overcurrent relays. Relay settings required for an adaptive numerical relay is obtained for practical cases like system with different DG penetration level and fault types. A four bus radial system with DG and overcurrent protection is simulated in SIMULINK platform and programming is done using MATLAB software.

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