Magnification of Performance Operation for Low Voltage DC Microgrids Based on Adaptive Droop Control Technique

Load sharing, circulation current, and bus voltage regulation are the main challenges of parallel converters operation in DC microgrids. For its simplicity, a droop controller is preferred for current sharing control among parallel DC-DC converters. The droop parameter values determine the current sharing error and voltage deviation of parallel DC-DC converters. In this paper, an adaptive and simple adaptive droop controller is proposed, where the droop parameters are estimated online. The proposed algorithm is characterized by low voltage regulation with improved load sharing performance of the DC microgrids. To evaluate the performance of the proposed algorithm, its performance under both the variable input voltage and load resistance is compared to that of a conventional droop controller. Simulation results show the effectiveness of the proposed algorithm over the conventional method.