Three‑phase four‑level inverter with capacitor voltage self‑balancing and high DC‑voltage conversion ratio

Bihua Hu; Fa Wang; Jiang Zhu; Wenlang Deng; Zhaohong Wang; Siyan Liu

Three‑phase four‑level inverter with capacitor voltage self‑balancing and high DC‑voltage conversion ratio

Vol. 23, No. 5, pp. 725-735, May 2023

10.1007/s43236-022-00574-z

Capacitor voltage

DC-voltage conversion ratio

Multi-level inverter

Switched capacitor

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 switchedcapacitor 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.

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Cite this article

[IEEE Style]

B. Hu, F. Wang, J. Zhu, W. Deng, Z. Wang, S. Liu, "Three‑phase four‑level inverter with capacitor voltage self‑balancing and high DC‑voltage conversion ratio," Journal of Power Electronics, vol. 23, no. 5, pp. 725-735, 2023. DOI: 10.1007/s43236-022-00574-z.

[ACM Style]

Bihua Hu, Fa Wang, Jiang Zhu, Wenlang Deng, Zhaohong Wang, and Siyan Liu. 2023. Three‑phase four‑level inverter with capacitor voltage self‑balancing and high DC‑voltage conversion ratio. Journal of Power Electronics, 23, 5, (2023), 725-735. DOI: 10.1007/s43236-022-00574-z.