Journal
IEEE ACCESS
Volume 6, Issue -, Pages 11772-11781Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2018.2811904
Keywords
Fault tolerance; modular multilevel converter (MMC); phase-shifted carrier (PSC) modulation; redundant submodules (SMs)
Categories
Funding
- National Natural Science Foundation of China [51477034, 51720105008]
- Power Electronics Science
- Education Development Program of Delta Group
- Young Elite Scientists Sponsorship Program by China Association for Science and Technology
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As the state-of-the-art voltage-source topology, the modular multilevel converter (MMC) is attractive for various medium- or high-power applications. In MMC, reliability and uninterruptable operation are always seen as primary concerns, which requires the MMC can continue operating even though some of the submodules (SMs) are failed. In this paper, a novel fault-tolerant modulation and control strategy is proposed for MMC in medium voltage applications. Compared with previous works, the proposed strategy provides optimum performances under healthy conditions and minimum performance degradation after SM failures. During healthy conditions, the redundant SMs are fully utilized to decrease SM capacitor voltage for higher reliability and to reduce switching frequency for higher efficiency. While during faulttolerant operation, by appropriate modification of the modulation and controllers, no extra healthy SMs need to be bypassed and the output voltage harmonics of MMC remain unchanged without causing voltage mismatches. Feasibility and effectiveness of the proposed strategy have been verified by simulations in MATLAB/Simulink software and experiments on a downscaled three-phase MMC prototype.
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