单相共用模块型柔性多状态开关研究

Flexible multi-state switch（FMS），as a new type of power electronic device，can be connected to different distribution networks to realize the function of regulating power transmission. Based on cascaded H-bridge flexible multi-state switch（CHB-FMS），a single-phase shared modular FMS topology is proposed. The CHB-FMS module is composed of three stages：rectifier，isolator and inverter. The new topology uses the idea of module sharing，and the shared modular only retains rectifier stage，which can save a lot of full bridge modules and DC／DC isolation modules，and effectively reduce the volume and cost of FMS. The working principle of single-phase shared modular FMS topology is studied，its mathematical model is established，the parameter design method is studied，the voltage and power control equations are derived，and the module voltage equalization strategy is proposed. Finally，a 500 W single-phase shared modular FMS principle experimental prototype consisting of two modules is built，the power transmission and power jump experiments under different phases are realized，and the feasibility of the proposed topology and its control strategy is verified.