Impact of distributed generation on protection of power system

Day by day demand of Electricity is increasing so, in order to fulfill this demand we need to increase generation of power. Because of this increasing demand, non-renewable energy sources are on the verge of extinction so the solution is to use renewable energy sources. One such solution is to connect DG having renewable energy sources in power system. But the insertion of DG has some impact on a power system. This paper deals with the evaluation of the impact of DG on the protection of power system. The work presented in this paper consists of a simulation of a radial power system in PSCAD /EMTDC software. Monitoring of both fault current and the load current is done in the simulation. The impact of DG on fault current under the influence of LG, LL and LLLG fault with and without protection is studied Maximum magnitude of fault current is found in case of LLLG fault. Also, the impact of resistive fault current limiter on the magnitude of fault current is studied. Both DG and source is protected from fault current by using overcorrect protection with pick up value of 2kA and 4kA respectively.