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MMC-HVDC Circulating Current Suppression Strategy Based on Virtual Impedance and QPR Control
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Junrui WANG, Shuai DOU  Student Member, CPSS, Ming WANG
Journal of Power Supply | 2026, 24(8) : 45 - 53
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Journal of Power Supply | 2026, 24(8): 45-53
• Power Converter Modeling and Control •
MMC-HVDC Circulating Current Suppression Strategy Based on Virtual Impedance and QPR Control
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Junrui WANG, Shuai DOU  Student Member, CPSS, Ming WANG
Affiliations
  • School of Electrical and Information Engineering, North Minzu University, Yinchuan 750000, China
Published: 2026-08-30 doi: 10.13234/j.issn.2095-2805.2026.8.45
Outline
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The circulating current between the sub-module bridge arms of a modular multilevel converter-high voltage direct current (MMC-HVDC) transmission system distorts the bridge arm current, thus affecting the balance of capacitor voltage. According to the circuit theorem and working characteristics of a modular multilevel converter (MMC), the problem of circulating current in the second harmonic component and the multi-frequency even-order harmonic component of the MMC is analyzed. The extraction and suppression of the second harmonic component are realized by using a notch filter and a quasi-proportional resonant (QPR) controller. The virtual impedance is added to suppress the multi-frequency even-order harmonic component of circulating current in the MMC. The above suppression strategy simultaneously suppresses the second harmonic component and multi-frequency even-order harmonic component, and the effect of circulating current suppression is obvious, indicating that it is suitable for the circulating current suppression control of MMC-HVDC. Simulation results show that the QPR control strategy with virtual impedance can effectively suppress fluctuations in the MMC circulating current waveform, MMC bridge arm current waveform and MMC-HVDC AC-side current.

Circulating current suppression  /  notch filter  /  quasi-proportional resonant (QPR) control  /  virtual impedance
王君瑞, 豆帅中国电源学会学生会员, 王铭. 虚拟阻抗+QPR控制的MMC-HVDC环流抑制策略. 电源学报, 2026 , 24 (8) : 45 -53 . DOI: 10.13234/j.issn.2095-2805.2026.8.45
Junrui WANG, Shuai DOU, Ming WANG. MMC-HVDC Circulating Current Suppression Strategy Based on Virtual Impedance and QPR Control[J]. Journal of Power Supply, 2026 , 24 (8) : 45 -53 . DOI: 10.13234/j.issn.2095-2805.2026.8.45
Funding
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  • National Natural Science Foundation of China(52167004)
  • Ningxia Hui Autonomous Region Intelligent Equipment and Precision Detection Technology Research and Application Innovation Team(2022BSB03104)
  • North Minzu University Innovation Project(YCX24115)
Appendix
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Year 2026 volume 24 Issue 8
29
3
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.8.45
  • Receive Date：2024-09-27
  • Online Date：2026-10-29
  • Published：2026-08-30
Article Data
Affiliations
History
  • Received：2024-09-27
  • Revised：2024-12-02
  • Accepted：2024-12-14
Funding
National Natural Science Foundation of China(52167004)
Ningxia Hui Autonomous Region Intelligent Equipment and Precision Detection Technology Research and Application Innovation Team(2022BSB03104)
North Minzu University Innovation Project(YCX24115)
Affiliations
    School of Electrical and Information Engineering, North Minzu University, Yinchuan 750000, China
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