Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Application of cascaded H-bridge multilevel inverter in the speed regulation of medium- and high-voltage asynchronous motor

  • Weiliang Wu (School of Electrical Engineering and Automation, Jiangxi University of Science and Technology) ;
  • Xiping Liu (School of Electrical Engineering and Automation, Jiangxi University of Science and Technology) ;
  • Jianwei Liang (School of Electrical Engineering and Automation, Jiangxi University of Science and Technology) ;
  • Zhangqi Liu (School of Electrical Engineering and Automation, Jiangxi University of Science and Technology) ;
  • Chaozhi Huang (School of Electrical Engineering and Automation, Jiangxi University of Science and Technology)
  • Received : 2023.05.25
  • Accepted : 2023.12.22
  • Published : 2024.03.20
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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.

Keywords

Acknowledgement

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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