Improving the Sharing of Active and Reactive Power of the Islanded Microgrid Based on Load Voltage Control

Abstract

ABSTRACT In this paper, a new control method is proposed to regulate the critical load’s voltage at the nominal value for low-voltage microgrids. So that, without telecommunication communication, the impedance voltage drop of the connection between the distributed generation (DG) output to the point of common coupling (PCC) for the passing of reactive and active power will be compensated. Where the Q-V droop control method will be modified to adjust the voltage of critical load to the normal value. Also, the sharing of reactive and active powers is accurately based on the DG resources capacity between them. For distinct control of the reactive and active powers and accurately sharing them between sources from the virtual impedance used with control loops of current and voltage. Also, in this method, the circulating current between sources will be minimized. The proposed method to test its effectiveness was performed on two networks, one with two DG units and the other with four DG units. The simulation results show that the proposed method is effective.