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Three-level boost inverter with capacitor voltage self-balancing and high conversion efficiency for low DC voltage systems

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Abstract

Currently, Z-source networks are widely employed to extend the output-voltage range of inverters operating at a low voltage DC source. However, these inverters are troubled by low power-conversion efficiency and an obvious current distortion due to the copper losses and core losses of the inductors. In addition, they have limited voltage levels. In this paper, a novel boost network composed of two power switches, two capacitors, and two diodes is proposed to overcome these shortcomings. Meanwhile, a corresponding modulation strategy is also set forth to achieve capacitor voltage self-balancing and to regulate the output AC voltage. Moreover, by adding more switched-capacitor cells, the range of the output voltage can be further improved, and the max DC/AC-voltage conversion ratio of the inverter with n cells is √3(n + 1)/3. At last, an inverter prototype with a 1 kW power rating is built, and the obtained results demonstrate that this inverter possesses the following superiorities: a wider range of output voltage, automatic balancing of the capacitor voltage, less current distortion, and high-efficiency power conversion.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Acknowledgements

This work was supported in part by the Innovation Platform and Talent Program of Hunan Province under Grant 2021RC2095, in part by Natural Science Foundation of China under Grant 62003288, in part by the Guangdong Basic and Applied Basic Research Foundation under Grant 2022A1515140009, in part by Science and Technology Research Project of Guizhou Province under Grant Qiankehe Basic-ZK[2022]General 17, and in part by the Science and Technology Innovation Program of Hunan Province under Grant 2022GK2050.

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Authors and Affiliations

  1. School of Automation and Electronic Information, Xiangtan University, Xiangtan, China

    Bihua Hu, Zhaohong Tang, Xiangyun Qin & Bumin Meng

  2. College of Electronic Engineering, Dongguan University of Technology, Dongguan, China

    Zhi Zhang

  3. School of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang, China

    Jinqing Linghu

  4. Weisheng Energy Industry Technology Co., Ltd., Changsha, China

    Jihong Qian

  5. TBEA Hengyang Transformer Co., Ltd., Hengyang, Hunan, China

    Rong Han

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  1. Bihua Hu
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Correspondence to Bumin Meng.

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Hu, B., Tang, Z., Zhang, Z. et al. Three-level boost inverter with capacitor voltage self-balancing and high conversion efficiency for low DC voltage systems. J. Power Electron. 23, 1820–1832 (2023). https://doi.org/10.1007/s43236-023-00677-1

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  • DOI: https://doi.org/10.1007/s43236-023-00677-1

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