Multi-microgrid Coordination Control Strategy Based on Improved Virtual Synchronous Motor

Research on the coordinated control of sub-microgrids in multi-microgrid systems is limited, with issues such as large overshoot and slow response speed in control methods. Firstly, the virtual synchronous motor (VSM) technology is introduced into the sub-microgrid layer, proposing a coordinated control strategy for multi-microgrids under different power exchange scenarios, enabling stable operation of the system during grid connection/disconnection and changing operational scenarios. Secondly, fuzzy PI control and improved particle swarm optimization algorithm are introduced to enhance the effectiveness of coordinated control based on traditional VSG control. Finally, through case studies, it is demonstrated that the proposed coordinated control scheme based on VSG effectively suppresses frequency and voltage fluctuations in multi-microgrid systems under different power exchange scenarios. A comparison is made among three control methods, and experiments conducted on a multi-microgrid system testbed validate that the improved VSM-based coordinated control scheme exhibits faster response, smaller error, and more stable output.