Voltage balancing between sub-module (SM) capacitors is essential for reliable operation of the modular multilevel converter (MMC). To facilitate design and understanding of the balancing controllers, this study presents an energy transfer analysis for MMC, which explains how the energy can be independently transmitted from/to one phase, between the upper and lower arms, and among the SMs, of an MMC. Using this analysis, the variables which can be utilized to achieve capacitor voltage balancing are identified. Validity of this study has been verified by experimental results based on a three-phase MMC prototype.


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    Title :

    Energy transfer analysis for capacitor voltage balancing of modular multilevel converters


    Contributors:
    Binbin Li, (author) / Rui Li, (author) / Williams, Barry W. (author) / Dianguo Xu, (author)


    Publication date :

    2016-06-01


    Size :

    2009404 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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