Novel Unified Control Framework for Networked RES-BES Microgrids With Enhanced Performance

The increasing deployment of renewable energy sources (RESs) facilitates the interconnection of distributed energy networks, thereby maximizing the utilization of the unevenly distributed RESs. Networked hybrid ac/dc microgrids enable regional multi-terminal networks at end-user sites, offering plug-and-play integration for RESs and battery energy storage systems (BESs) through synergistic ac/dc complementarity. However, this interconnected configuration introduces increased complexity in control strategies and poses significant power management challenges for RES-BES microgrids, as sudden RES fluctuations demand system-wide BES compensation to prevent local overloads. This paper proposes a unified droop control-based framework for networked hybrid microgrids comprising RESs, BESs and loads. The proposed approach enables seamless transitions between operational modes, proportional power sharing, and enhanced operation without circulating currents or overstressing components. Furthermore, it inherently addresses abrupt source failures and asymmetric line faults without requiring adjustments in the primary control methods, ensuring uninterrupted maximum power harvest of RESs. The effectiveness of the proposed approach is validated through case studies using real-time simulation platform Typhoon-HIL.