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Title
Japanese:MMCのセルコンデンサ電流を低減できる変調法の提案とアクティブフィルタへの応用 
English:New Modulation Method to Reduce Cell Capacitor Ripple Current in Modular Multilevel Cascade Converters and its Application to Active Power Filters 
Author
Japanese: 新井 卓郎, 餅川 宏, 佐野 憲一朗, 藤田 英明.  
English: Takurou Arai, Hiroshi Mochikawa, Kenichiro Sano, Hideaki Fujita.  
Language Japanese 
Journal/Book name
Japanese:電気学会論文誌Ｄ（産業応用部門誌） 
English:IEEJ Transactions on Industry Applications 
Volume, Number, Page vol. 143    no. 8    pp. 590-599
Published date Aug. 2023 
Publisher
Japanese:電気学会 
English:IEE Japan 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.jstage.jst.go.jp/article/ieejias/143/8/143_590/_article/-char/ja/
 
DOI https://doi.org/10.1541/ieejias.143.590
Abstract This paper proposes a new modulation method for modular multilevel cascade converter-based active power filters (MMC-APFs). The proposed modulation method uses the same pulse width modulation (PWM) controller as a traditional bipolar modulation method, and the generated PWM signals are interchanged among the bridge cells. This method makes it possible to shift the carrier phase angle between two switching legs in one cell, reducing the ripple current through the cell capacitor without increasing the number of PWM channels. This is important to reduce the cost of the control circuit, especially in low-voltage applications of MMCs. An experimental circuit of a 3.3kVA MMC-APF demonstrates a 20% reduction in the ripple current and a 38% reduction in the power loss in the cell capacitor.

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