Adaptive Over-current Protection Algorithm for a Microgrid

In this paper, a modified protection scheme is proposed for connecting distributed generation to the utility grid. This is based on Adaptive Overcurrent Protection (AOP) scheme proposed in literature but is modified to suit all the possible needs of a microgrid. The main objective of this algorithm is to protect the entire system (including distributed generation) without modifying the existing protection scheme of the main grid. The algorithm is developed based on the data collected by the Microgrid Central Controller (MCC) from the relays. The proposed scheme is tested taking into consideration all possible scenarios of operation as well as faults that can occur in the microgrid.