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<p>On account of its minimal harmonic distortion and exceptional modularity, the modular multilevel converter (MMC) is highly applicable to high power applications. When a submodule (SM) fails, the switching frequency and voltage of the SM capacitor in fault arm increase, resulting in elevated power losses within the MMC faulty arm, impacting the lifespan. This study puts forward a power loss optimization control method (VPD-PLOC) for the variable phase-disposition level shift pulse width modulation frequency. By adjusting the PD-PWM frequency using VPD-PLOC, in the context of an asymmetric arm structure, optimizing the power losses within the faulty MMC arm and adjusting the switching losses of MMC power devices can be achieved. The proposed VPD-PLOC effectively enhances MMC lifetime under the asymmetric arm structure by minimizing power losses. The efficacy of VPD-PLOC is validated through simulations conducted using PSCAD/EMTDC as well as experiments performed on a small-scale MMC prototype.</p>

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Power loss optimization control of MMCs based on improved variable phase disposition PWM frequency under asymmetric arm structures

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Jifeng Zhao,
  • Yangkang Gui,
  • Na Yang

摘要

On account of its minimal harmonic distortion and exceptional modularity, the modular multilevel converter (MMC) is highly applicable to high power applications. When a submodule (SM) fails, the switching frequency and voltage of the SM capacitor in fault arm increase, resulting in elevated power losses within the MMC faulty arm, impacting the lifespan. This study puts forward a power loss optimization control method (VPD-PLOC) for the variable phase-disposition level shift pulse width modulation frequency. By adjusting the PD-PWM frequency using VPD-PLOC, in the context of an asymmetric arm structure, optimizing the power losses within the faulty MMC arm and adjusting the switching losses of MMC power devices can be achieved. The proposed VPD-PLOC effectively enhances MMC lifetime under the asymmetric arm structure by minimizing power losses. The efficacy of VPD-PLOC is validated through simulations conducted using PSCAD/EMTDC as well as experiments performed on a small-scale MMC prototype.