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Grid-connected MMC Common-mode Voltage Suppression at Front End of Medium-voltage Motor Driving System
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Jingkun YAO1, Shancheng QI1, Shijun CHAI2
Journal of Power Supply | 2024, 22(6) : 280 - 287
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Journal of Power Supply | 2024, 22(6): 280-287
• Electric Machine System and Control •
Grid-connected MMC Common-mode Voltage Suppression at Front End of Medium-voltage Motor Driving System
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Jingkun YAO1, Shancheng QI1, Shijun CHAI2
Affiliations
  • 1 School of Electrical Engineering and Automation Henan Institute of Technology Xinxiang 453003 China
  • 2 Operating Branch Zhengzhou Metro Group Co., Ltd Zhengzhou 450000 China
Published: 2024-11-30 doi: 10.13234/j.issn.2095-2805.2024.6.280
Outline
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To maximumly protect the medium-voltage motor in a back-to-back medium-voltage motor driving system without transformer based on modular multilevel converter (MMC) from the influence of asymmetric grid faults and switching actions, a control strategy for minimizing the common-mode voltage of the front-end transformerless grid-connected MMC is designed. The common-mode voltage caused by the asymmetric grid fault can be canceled by the MMC counterpart voltage, and the switching ripples caused by the switching action of the MMC can be suppressed by arranging the arm-voltage pulses end-to-end. In addition, the influence of MMC common-mode voltage suppression on the single-phase power deviation is analyzed, and the feedforward control is proposed accordingly. Tests were carried out using a grid-connected MMC prototype system, and experimental results verified that the maximum common-mode voltage of the grid-connected system under severe asymmetric grid conditions can be reduced to 1/3N of its original value by the proposed control strategy, where N is the per-arm submodule number. Meanwhile, the unity power factor, constant DC voltage, and balanced single-phase power were also realized.

Medium-voltage motor driving system  /  common-mode voltage  /  grid-connected modular multilevel converter (MMC)  /  grid fault
Jingkun YAO, Shancheng QI, Shijun CHAI. Grid-connected MMC Common-mode Voltage Suppression at Front End of Medium-voltage Motor Driving System[J]. Journal of Power Supply, 2024 , 22 (6) : 280 -287 . DOI: 10.13234/j.issn.2095-2805.2024.6.280
Funding
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  • Key R&D and Promotion Special Projects in Henan Province(192102210144)
Appendix
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Year 2024 volume 22 Issue 6
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Article Info
doi: 10.13234/j.issn.2095-2805.2024.6.280
  • Receive Date：2021-11-17
  • Online Date：2025-07-19
  • Published：2024-11-30
Article Data
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History
  • Received：2021-11-17
  • Revised：2022-02-27
  • Accepted：2022-03-04
Funding
Key R&D and Promotion Special Projects in Henan Province(192102210144)
Affiliations
    1 School of Electrical Engineering and Automation Henan Institute of Technology Xinxiang 453003 China
    2 Operating Branch Zhengzhou Metro Group Co., Ltd Zhengzhou 450000 China
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