A High-Performance Model Predictive Control Strategy Based on Si/SiC Cascaded H-Bridge Inverter
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.
silicon carbide MOSFETsilicon IGBTcascaded H-bridge inverterswitching lossmodel predictive control
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