Journal of Power Electronics

  • 제20권5호
  • /
  • Pages.1149-1161
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  • 2020
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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DOI QR코드

DOI QR Code

Circulating current suppression control for modular multilevel converters based on restricted self-redundant states prediction

  • Hu, Xing (School of Electrical Engineering, Southeast University) ;
  • Zhang, Jianzhong (School of Electrical Engineering, Southeast University) ;
  • Deng, Fujin (School of Electrical Engineering, Southeast University) ;
  • Chen, Gui (School of Electrical Engineering, Southeast University) ;
  • Chen, Qiang (School of Electric Power Engineering, Nanjing Institute of Technology) ;
  • Din, Zaki ud (School of Electrical Engineering, Southeast University)
  • 투고 : 2020.01.08
  • 심사 : 2020.05.20
  • 발행 : 2020.09.20
⟨ 이전 논문 다음 논문 ⟩

초록

Circulating current exists among phases or between the DC link and the three phases in a modular multilevel converter (MMC). Suppression control of the alternating components in circulating current is a critical issue for the stable and efficient operation of an MMC. Due to the redundancy and symmetry of MMCs, some of the self-redundant states of MMCs can be used to suppress the alternating components in circulating current without affecting the output performance of the converter. In this paper, a theoretical derivation of the boundary of redundant states is given. Then a suppression strategy for circulating current is proposed based on prediction control and the boundary of redundant states. The selection range of the redundant states is narrowed in this case, which reduces the computation burden when compared to the original method and ensures excellent performance in the suppression of circulating current. Simulations and experiments are carried out to verify the effectiveness of the proposed strategy.

키워드

과제정보

This work was sponsored by the National Nature Science Foundation of China under Grant 51577025 and the Science and Technology Program of State Grid Corporation of China, 5100-201999330A-0-0-00.

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