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Application of cascaded H-bridge multilevel inverter in the speed regulation of medium- and high-voltage asynchronous motor

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Abstract

Medium- and high-voltage motors are characterized by high power and large inertia, and are widely used in industrial frequency conversion. The cascaded H-bridge multilevel (CHB-ML) inverter adopts a modular design concept to realize high-voltage and high-power functions by cascading multiple identical low-voltage conversion units. Moreover, the harmonic content of the output current of the inverter is small. For this purpose, a multilevel inverter consisting of eight H-bridge inverter units cascaded in each phase is introduced to drive medium- and high-voltage asynchronous motors for starting and frequency regulation. The carrier phase-shifted sinusoidal pulse-width modulation technique, DC voltage equalization control of power unit, and speed sensorless vector control strategy based on a voltage–current hybrid chain observer are mainly introduced. The simulation and experimental results of the real-time digital simulation system (RTDS) of the asynchronous motor dragged by the inverter verify that the CHB-ML inverter with the proposed control strategy has good starting and frequency regulation performance. These findings provide a technical guarantee for the field of medium- and high-voltage high-power drives.

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The datasets used or analyzed during this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (52067008), the Science and Technology Research Project of the Education Department of Jiangxi Province of China (GJJ210823), and the Graduate Innovation Project of the Education Department of Jiangxi Province of China (YC2023-B219).

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Authors and Affiliations

  1. School of Electrical Engineering and Automation, Jiangxi University of Science and Technology, Ganzhou, Jiangxi Province, China

    Weiliang Wu, Xiping Liu, Jianwei Liang, Zhangqi Liu & Chaozhi Huang

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  1. Weiliang Wu
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  2. Xiping Liu
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  3. Jianwei Liang
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  4. Zhangqi Liu
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  5. Chaozhi Huang
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Contributions

WW was involved in the technical research, simulation modeling, experimental platform building and testing, software, and paper writing. XL carried out technical proposal guidance, experiment guidance, paper review, and funding acquistion. JL, ZL and CH conducted the technical proposal guidance, and paper review.

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Correspondence to Weiliang Wu.

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Wu, W., Liu, X., Liang, J. et al. Application of cascaded H-bridge multilevel inverter in the speed regulation of medium- and high-voltage asynchronous motor. J. Power Electron. 24, 391–413 (2024). https://doi.org/10.1007/s43236-023-00759-0

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  • DOI: https://doi.org/10.1007/s43236-023-00759-0

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