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Novel extensible multilevel inverter based on switched-capacitor structure

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Abstract

Multilevel inverters (MLIs) play an important role in research on renewable energy conversion. However, in traditional designs, the high-voltage stress of switching devices and the large number of switches limit the wide application of the inverter. To ameliorate these problems, this paper proposes a switched-capacitor multilevel inverter (SCMLI). When compared with traditional MLIs, the proposed SCMLI utilizes a switched-capacitor structure, where the capacitors can achieve voltage self-balancing without auxiliary methods. Thus, it permits changes of the positive and negative polarity of the output level without the need for an H-bridge. In addition, with the augment of the level in the expanded SCMLI structure, the maximum blocking voltage can be kept constant. To show the advantages of the proposed structure, an extensible single dc source five-level SCMLI prototype has been built. Through a comparative analysis with different topologies, this paper also presents the advantages of the proposed topology in terms of the output voltage gain, number of output levels, and voltage stress. Finally, the correctness and feasibility of the proposed inverter are validated by extensive experiments.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under Grant 51507155, in part by the Youth Key Teacher Project of Henan Universities under Grant 2019GGJS011, in part by the Scientific and Technological Research Project of Henan Province under Grant 222102520001, and in part by the Postgraduate Education Reform and Quality Improvement Project of Henan Province under Grant YJS2021JD02. On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. School of Electrical Engineering, Zhengzhou University, Zhengzhou, China

    Yaoqiang Wang, Juncheng Ye, Ruohan Ku, Yi Wang & Jun Liang

  2. Henan Engineering Research Center of Power Electronics and Energy Systems, Zhengzhou, China

    Yaoqiang Wang, Juncheng Ye & Yi Wang

  3. Xuchang Power Supply Company, State Grid Henan Electric Power Co., Ltd., Xuchang, China

    Ruohan Ku

  4. School of Engineering, Cardiff University, Cardiff, WLS, UK

    Jun Liang

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  1. Yaoqiang Wang
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  2. Juncheng Ye
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  3. Ruohan Ku
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  4. Yi Wang
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Correspondence to Yi Wang.

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Wang, Y., Ye, J., Ku, R. et al. Novel extensible multilevel inverter based on switched-capacitor structure. J. Power Electron. 22, 1448–1460 (2022). https://doi.org/10.1007/s43236-022-00450-w

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  • DOI: https://doi.org/10.1007/s43236-022-00450-w

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