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Energy transfer analysis for capacitor voltage balancing of modular multilevel converters

Li, Binbin and Li, Rui and Williams, Barry W. and Xu, Dianguo (2016) Energy transfer analysis for capacitor voltage balancing of modular multilevel converters. In: 2016 IEEE Transportation Electrification Conference and Expo (ITEC). IEEE, Piscataway. ISBN 9781509004027

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Abstract

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.