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

Duc Dung Le; Dong-Choon Lee; Eui-Cheol Nho

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

Duc Dung Le

Dong-Choon Lee

Eui-Cheol Nho

Vol. 23, No. 9, pp. 1342-1352, Sep. 2023

10.1007/s43236-023-00679-z

Fault-tolerant capability

Low-frequency operation

Modular multilevel converter

Submodule capacitor voltage fluctuation

Abstract

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.

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Cite this article

[IEEE Style]

D. D. Le, D. Lee, E. Nho, "Fault‑tolerant capability of MMC with novel structure of middle submodules," Journal of Power Electronics, vol. 23, no. 9, pp. 1342-1352, 2023. DOI: 10.1007/s43236-023-00679-z.

[ACM Style]

Duc Dung Le, Dong-Choon Lee, and Eui-Cheol Nho. 2023. Fault‑tolerant capability of MMC with novel structure of middle submodules. Journal of Power Electronics, 23, 9, (2023), 1342-1352. DOI: 10.1007/s43236-023-00679-z.