Microgrid Protection using Directional Overcurrent Scheme

Abstract

At distribution level the infiltration of distributed generation increases, managing of these systems effectively becomes an ultimatum. One Recommended way to manage these systems is validation of Micro grids. Micro grids are smaller version of large power systems. At distribution network side Micro grid can formed with collaboration of several Renewable sources and loads, that utilize as single aggregated load or generation sources micro grid can either connected to the grid or in case of a grid fault in island-ed mode. Micro grid would be improve system Efficiency and Reliability. Its objective is to deliver reliable and quality energy in both modes. PS-CAD would be used for modelling of small distribution network as if it were micro grid. Renewable sources along with dispatch-able sources could be added; Which supply power at maximum requirement for load more than average load. The type fault would be simulated at buses in both grid connected and island ed mode. At that time the Analyzing of fault current and voltage levels obtained. According to that deciding of protection scheme at distribution network. A protection scheme has been developed which consist of directional over current relays. These relays are coordinated in terms of their operating time.