Journal of Power Electronics

  • 제23권9호
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  • Pages.1342-1352
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  • 2023
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

Fault-tolerant capability of MMC with novel structure of middle submodules

  • Duc Dung Le (Department of Electrical and Electronics Engineering, Ho Chi Minh City University of Food Industry ) ;
  • Dong‑Choon Lee (Department of Electrical Engineering, Yeungnam University) ;
  • Eui‑Cheol Nho (Department of Electrical Engineering, Pukyong National University)
  • 투고 : 2023.04.26
  • 심사 : 2023.07.02
  • 발행 : 2023.09.20
⟨ 이전 논문 다음 논문 ⟩

초록

In this paper, an improved modular multilevel converter (MMC) topology has been proposed with fault-tolerant capability and reduced submodule capacitor voltage fluctuation (SMCVF) in a low frequency operating range. In the proposed converter, a novel middle SM, which has salient features, is inserted between the upper and lower arms. For regular operation, the middle SM is applied to mitigate the power fluctuations in both arms by providing distribution of high-frequency power components, which reduces the AC voltage fluctuation on the SM capacitor. When a fault occurs in any SM in the upper or lower arms, a new half-bridge SM can be configured from the middle SM to replace the faulty SM without any interruption, which means the converter is operated in the fault-tolerant mode. Therefore, the performance of the converter is maintained well, and the system reliability is enhanced. Simulation and experimental results have verified the effectiveness of the proposed topology and control strategy.

키워드

과제정보

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20194030202310).

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