Robust SoC Balancing Method for Distributed Storage based Islanded Microgrids

In this paper, the Adaptive Frequency Droop Virtual Power (AFDPV) method is implemented in a distributed control-based consensus to ensure the State of Charge (SoC) balancing of BESSs (Battery Energy Storage Systems), in an AC Microgrid (MG). An average consensus algorithm is used to acquire the average SoC value of the BESSs and the AFDVP strategy is designed in this proposal with a distributed architecture, to balance the SoC of BESSs while maintaining the MG stability, the frequency and the voltage variations between the permissible range the European norm EN 50160. In this distributed control architecture, the SoC balancing, the frequency and voltage restoration are realized, only thanks to local information of the Distributed Generator (DG) and information from their neighbors. A Matlab/Simulink simulation is performed in order to verify the effectiveness of the proposed method in the case of communication failure. In order to compare their performances, a comparison between the proposed distributed control and a centralized control is also provided.