Variable-Weight Model Predictive Modulation Strategy for A Si-SiC Cascaded H-Bridge Inverter

Ziyue Guo,Zishun Peng,Huimin Quan,Zhenxing Zhao,Minying Li,Yong Ning

2022 4TH INTERNATIONAL CONFERENCE ON SMART POWER & INTERNET ENERGY SYSTEMS, SPIES（2022）

Hunan Univ | Wenzhou Univ | Hunan Inst Engn | Guangdong Zhicheng Champ Grp Co Ltd

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Abstract

A Si-SiC cascaded H-bridge (CHB) inverter, due to the redundancy of switching states, can operate with different switching of Si and SiC cells. Therefore, apart from considering the power quality and efficiency of inverters, it also brings the problem of switching between Si and SiC cells. For this, a variable-weight Model Predictive Control (MPC) method is designed to select the overall switch state and assign the switching of cells. A five-level Si-SiC CHB inverter device is built. Compared with fixed weight MPC, the output current THD can be reduced by 1.89% or the device efficiency can be improved by 0.1396%.

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Key words

silicon carbide MOSFET,silicon IGBT,cascaded H-bridge,model predictive control

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