New modular multilevel converter with power channels between upper- and lower arms suitable for MV drives

@article{He2015NewMM,
  title={New modular multilevel converter with power channels between upper- and lower arms suitable for MV drives},
  author={Liqun He and Kai Zhang and Jian Xiong and Shengfang Fan and Xiaosen Chen and Yaosuo Xue},
  journal={2015 IEEE Applied Power Electronics Conference and Exposition (APEC)},
  year={2015},
  pages={799-805}
}
When a modular multilevel converter (MMC) is operated at low frequencies, the submodule (SM) capacitors will suffer from huge voltage fluctuations. This problem must be overcome before MMCs find wider applications in medium voltage (MV) drives that require a wide speed range. The established solution for suppressing the voltage fluctuation have been injecting high frequency common-mode voltage and circulating current into each phase leg. This inevitably increases current stress of the power… CONTINUE READING

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