单相共用模块型柔性多状态开关研究

Research on single-phase shared modular flexible multi-state switch

柔性多状态开关(FMS)作为一种新型电力电子装置可连接不同配电网,实现调节功率传输的功能。基于级联型H桥柔性多状态开关(CHB-FMS)提出了一种单相共用模块型柔性多状态开关(SMFMS)拓扑。CHB-FMS模块由整流、隔离及逆变三级构成,新拓扑运用模块共用思想,共用模块仅保留整流级,可节省大量的全桥子模块与DC/DC隔离单元,有效降低了FMS的体积与成本。同时研究了SMFMS拓扑工作原理,建立其数学模型,研究参数设计方法,推导电压、功率控制方程,并提出模块均压策略。最后搭建了由2个模块组成的500 WSMFMS原理性实验样机,进行了不同相位下功率传输以及功率跳变实验,验证了所提拓扑及其控制策略的可行性。

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.