Abstract
The family of Modular Multilevel Converter (MMC) has become one of the most promising converter topologies for medium/high-voltage applications because of its modularity and scalability. Specifically, the AC-AC MMC is a promising candidate for medium-voltage motor drive applications. As the AC-AC MMC is based on stacking a large number of Submodules (SMs), its operation is vulnerable to SM failure. To improve the reliability/availability of the AC-AC MMC, in this paper, a post-fault strategy is proposed to ensure stable operation and normal power transfer capability of the MMC subsequent to any SM failure. Besides, since proper operation of the AC-AC MMC necessitates that the magnitude of the SM capacitor voltage fluctuations need to be attenuated, SM capacitor voltage fluctuation mitigation strategies are also proposed. Performance and effectiveness of the proposed methods are verified based on simulation studies in the PSCAD/EMTDC software environment.
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