A Distributed Power Sharing Approach for Islanded Microgrids

Abstract

This paper presents a distributed control scheme to accurately share active, reactive, and selected harmonic power demands for islanded droop-controlled microgrids. The proposed strategy requires only a sparse communication network because the DG unit uses local and its neighbours’ information to carry out the control algorithm. In the proposed strategy, virtual impedances at selected dominant frequencies are adaptively regulated based on the consensus algorithm, and the power sharing errors in the islanded microgrid system is eliminated irrespective of load conditions. The proposed method can be implemented directly in practice without any information such as the feeder impedances or the detailed microgrid configuration. The simulation results are also provided to validate the feasibility and effectiveness of the proposed method.