Si/SiC cascaded H-bridge inverters enable a combination of different devices to ensure low output current total harmonic distortion(THD)and high device efficiency.However,this also presents the challenge of switching and as-signing Si/SiC cells.In this paper,a model predictive control(MPC)with variable weight is designed to select the total switch state and assign the cell switch combination.In this method,a variable weight based on the switching loss of the de-vice is introduced into the cost function of selecting the total switching state of the inverter and the switching combination of Si/SiC cells,to improve the efficiency and output current harmonic distortion rate of the inverter.The effectiveness of variable-weight MPC is verified on the five-level Si/SiC cascaded H-bridge inverter device,and the output current THD is reduced by up to 2.05%and the device loss is reduced by up to 4.53%compared with the fixed-weight MPC.
关键词
碳化硅MOSFET/硅IGBT/级联H桥逆变器/开关损耗/模型预测控制
Key words
silicon carbide MOSFET/silicon IGBT/cascaded H-bridge inverter/switching loss/model predictive control
维普
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