Novel active synchronization strategy for multi-bus microgrid with distributed cooperation control

摘要

This paper presents a novel active synchronization control strategy of multi-bus microgrid based on distributed cooperation technology. The method can reconnect microgrid back to utility grid (UG) seamlessly with sparse communication channels. Through the cross product of voltage vectors in the synchronizer, the frequency and phase of microgrid can track the main grid simultaneously. The voltage differences of UG and point of common coupling (PCC) are fed back to subsequent PI controllers to generate synchronization correction signals, which are only sent to the leader distributed generators (DG). Meanwhile, each DG exchanges information with its neighbors. The voltage of PCC can follow and synchronize with the main grid for a seamless transition and all DGs achieve the consensus behavior. Compared with traditional synchronization methods, the proposed method obviates complex communication network and improves flexibility and redundancy. Simulation results are presented to verify the effectiveness of the proposed method.