Droop-Based Distributed Secondary Control Method With Reduced Communication Complexity for Radial DC Microgrids

This article proposes a distributed secondary control method for radial dc microgrid systems with reduced communication complexity. The proposed method utilizes the bus voltage information of the dc microgrid, which is communicated to the individual converters. The proposed method is distributed in nature as the secondary controllers are implemented locally at each converter. The proposed method does not require communication channels between individual converters. Thus, it achieves accurate current sharing and good load voltage regulation with reduced complexity compared to state-of-the-art control methods. The proposed method is robust, and its performance gracefully degrades in the event of a failure of a communication channel. Also, the addition or removal of a converter is seamless with the proposed method. The effectiveness of the proposed method is validated using circuit simulations and hardware-based experiments on different configurations of radial dc microgrid systems.