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Improved Current Balance Open-loop Control Method for Five-level Inverter
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Hua WEI1, Min LI1, Kemeng CHEN2, Xi XIAO2
Journal of Power Supply | 2025, 23(4) : 100 - 110
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Journal of Power Supply | 2025, 23(4): 100-110
• DC-AC Inverters •
Improved Current Balance Open-loop Control Method for Five-level Inverter
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Hua WEI1, Min LI1, Kemeng CHEN2, Xi XIAO2
Affiliations
  • 1.ABB Beijing Drive Systems Co., Ltd., Beijing 100015, China
  • 2.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Published: 2025-07-30 doi: 10.13234/j.issn.2095-2805.2025.4.100
Outline
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Five-level inverters are widely used in the fields of energy storage and electric drive systems, especially in the high-voltage and high-power applications. As the power level increases, the capacity of one single inverter unit cannot meet the demand. Therefore, inverters need to be operated in parallel. Compared with the two-level or three-level topology, the circulating current between single-phase modules of parallel five-level inverters is more prominent due to the existence of floating capacitors. An improved current balance open-loop control method for a public DC bus structure is proposed. With a comparison of output current from each power module, a time stamp is set and the time shift control for vector switching is implemented, so that a positive or negative unbalanced current is artificially introduced to quickly eliminate the original circulating current. A set of 6 kV parallel high-voltage inverters were tested, and experimental results validated the effectiveness of the proposed method and the impact of voltage difference of the floating capacitor on the circulating current. The correction process only took 0.1 ms, and the current balance can be quickly and accurately completed.

Five-level inverter  /  circulating current suppression  /  time shift control  /  current balance
魏华, 李敏, 陈柯蒙, 肖曦. 一种改进的五电平逆变器电流平衡开环控制方法. 电源学报, 2025 , 23 (4) : 100 -110 . DOI: 10.13234/j.issn.2095-2805.2025.4.100
Hua WEI, Min LI, Kemeng CHEN, Xi XIAO. Improved Current Balance Open-loop Control Method for Five-level Inverter[J]. Journal of Power Supply, 2025 , 23 (4) : 100 -110 . DOI: 10.13234/j.issn.2095-2805.2025.4.100
Appendix
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Year 2025 volume 23 Issue 4
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.4.100
  • Receive Date：2023-03-17
  • Online Date：2026-10-26
  • Published：2025-07-30
Article Data
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History
  • Received：2023-03-17
  • Revised：2023-05-11
  • Accepted：2023-08-07
Affiliations
    1.ABB Beijing Drive Systems Co., Ltd., Beijing 100015, China
    2.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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