Fluctuation voltage control and fault‐tolerant operation of modular multilevel converters with zero‐sequence injection

  title={Fluctuation voltage control and fault‐tolerant operation of modular multilevel converters with zero‐sequence injection},
  author={Shuang Li and Zhixin Wang and Guoqiang Wang},
  journal={International Transactions on Electrical Energy Systems},
SUMMARY This paper focuses on voltage fluctuation mitigation and fault-tolerant control methods for modular multilevel converters (MMC). The reason for MMC output fluctuation caused by the floating capacitor voltage fluctuation at low frequency is carefully analyzed. To reduce voltage fluctuation, two control freedom degrees of high-frequency zero-sequence voltage and phase-to-phase circulating current are proposed. In fully implementing MMC functionalities, we comprehensively investigated… Expand
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