asma soleimanisardoo

Despite the many benefits of Distributed Generations (DGs), they can cause mis-coordination between protective devices by changes in the fault current level. Many DGs are connected to the network through power electronic (PE) interfaces, which are called Inverter Based Distributed Generators (IBDGs). This paper proposes a new method to mitigate the impact of IBDGs on existing protection coordination. The method manages IBDG fault current contribution by their PE interfaces in such a way that the digital protective devices can distinguish and ignore it. In addition, the fuse-recloser coordination in presence of DG is investigated and it is shown that the proposed method is able to preserve the original fuse-recloser coordination after installing IBDGs. The method does not require any communication infrastructure and is independent of penetration level and location of IBDGs and supports the plug and play functionality of IBDGs. The effectiveness of the proposed method is verified by simulation results on the IEEE 33-Bus power system with PSCAD/EMTDC software.