New Modulation Method to Reduce Cell Capacitor Ripple Current in Modular Multilevel Cascade Converters and its Application to Active Power Filters

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  • Arai Takuro
    Toshiba Infrastructure Systems and Solutions Corporation
  • Mochikawa Hiroshi
    Toshiba Infrastructure Systems and Solutions Corporation
  • Sano Kenichiro
    Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Fujita Hideaki
    Department of Electrical and Electronic Engineering, Tokyo Institute of Technology

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Other Title
  • 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

Abstract

<p>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.</p>

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