• Ruchi R. Kashyap

The overcurrent relays are the major protection devices in a distribution system. This paper presents Gravitational Search Algorithm (GSA) method for coordination of overcurrent relays. Modern distribution systems consist of various distributed generators (DG) to make reliable power system. Penetration of distributed generation in a distribution system changes the fault current and unidirectional nature of power flow. This leads to loss of coordination between various relays present in the system. Nowadays, various programming optimization techniques are frequently used to find optimal relay settings of overcurrent relays. The OC relay coordination in ring fed distribution networks is a highly constrained optimization problem. The purpose is to find an optimum relay setting to minimize the time of operation of relays and at the same time, to avoid the mal-operation of relays. This paper presents Gravitational Search Algorithm for the coordination of overcurrent relay for a system containing DG. A proper combination of primary and backup relay is selected to avoid mal operation of relays and unwanted outages when DG is penetrated. A four bus radial system is simulated in MATLAB SIMULINK platform and programming is done using MATLAB software

Distributed generation, Gravitational Search Al- gorithm (GSA), overcurrent (OC) relay, relay coordination.

"Gravitational search algorithm for optimal coordination of over current relay", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.344-348, May-2019, Available :http://www.jetir.org/papers/JETIR1905Q46.pdf

"Gravitational search algorithm for optimal coordination of over current relay", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp344-348, May-2019, Available at : http://www.jetir.org/papers/JETIR1905Q46.pdf