Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Three-phase four-level inverter with capacitor voltage self-balancing and high DC-voltage conversion ratio

  • Bihua Hu (School of Automation and Electronic Information, Xiangtan University) ;
  • Fa Wang (School of Automation and Electronic Information, Xiangtan University) ;
  • Jiang Zhu (School of Automation and Electronic Information, Xiangtan University) ;
  • Wenlang Deng (School of Automation and Electronic Information, Xiangtan University) ;
  • Zhaohong Wang (School of Automation and Electronic Information, Xiangtan University) ;
  • Siyan Liu (New Energy Institute, Hunan Vocational Institute of Technology)
  • Received : 2022.06.29
  • Accepted : 2022.11.28
  • Published : 2023.05.20
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Abstract

Multilevel inverters are widely employed in industry application due to their low voltage-variation rate and little current distortion. However, capacitor-voltage regulation adds the complexity of their modulation, and the low DC-voltage conversion ratio restricts their application in some specific occasions. Here, a new three-phase four-level inverter with switched-capacitor circuits and full-bridge circuits is proposed to address the above issues. In addition, a corresponding space-vector diagram is proposed to control the power switches of the inverter. In this space-vector diagram, each subsector includes only a switching sequence, which is simpler than the conventional one. Then, simulation and experimental platforms are established to demonstrate the validity of the proposed inverter. The obtained results show that the proposed inverter can meet the expected design requirements.

Keywords

Acknowledgement

This work was supported in part by the Hunan Natural Science Foundation under Grant 2021JJ30670, 2021JJ30668 and 2021JJ60052, and in part by Scientifc Research Foundation of Hunan Provincial Education Department under Grant 21C0066, and in part by the Science and Technology Innovation Program of Hunan Province under Grant 2022GK2050.

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