According to the actual project construction of the microgrid and distribution automation in Yuhang urban power grid， this paper studies the wiring method and hierarchical control scheme of a looped microgrid. The functions of power management， operation states management and synchronous control for grid integration in the microgrid central controller are investigated in detail. And then the states transition scheme of the looped microgrid for different fault locations is proposed. Owing to the existence of multiple synchronization points in the looped microgrid， a synchronization control strategy based on the general information from the central controller is proposed. The MATLAB/Simulink simulation software is adopted for the construction of the looped microgrid and an analysis is made of the dynamic characteristics of different processes of operation status switching and synchronization. The results have verified the effectiveness and correctness of the control strategies proposed.