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Carrier Reconfiguration for Improving Output Voltage Quality and Balancing Capacitor Voltages in MMDTC-Based STATCOM

Author

Listed:
  • Fengxiang Xie

    (Guoneng (Gonghe) New Energy Development Co., Ltd., Hainan Tibetan Autonomous Prefecture 813000, China)

  • Yuantang Qi

    (Guoneng (Gonghe) New Energy Development Co., Ltd., Hainan Tibetan Autonomous Prefecture 813000, China)

  • Yongdong Ji

    (Guoneng (Gonghe) New Energy Development Co., Ltd., Hainan Tibetan Autonomous Prefecture 813000, China)

  • Xiaofan Ji

    (National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China)

  • Xiangzheng Cui

    (School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)

  • Shuo Liu

    (School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)

  • Decun Niu

    (School of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)

Abstract

For Modular Multilevel DC-Link T-Type Converter (MMDTC)-based STATCOMs, under identical operating conditions, the submodule (SM) capacitor voltage ripple is inversely proportional to its capacitance value. A configuration with a lower capacitance will inevitably result in significant capacitor voltage ripples. During the PWM modulation process, these ripples can lead to distortions in the output voltage waveform. To address this issue, this paper proposes an innovative carrier reconfiguration method that not only compensates for the output voltage pulse deviation caused by SM capacitor voltage ripples but also achieves effective balancing of the SM capacitor voltages. Finally, the validity and performance of the proposed carrier reconfiguration method are verified through both simulations and experimental results.

Suggested Citation

  • Fengxiang Xie & Yuantang Qi & Yongdong Ji & Xiaofan Ji & Xiangzheng Cui & Shuo Liu & Decun Niu, 2025. "Carrier Reconfiguration for Improving Output Voltage Quality and Balancing Capacitor Voltages in MMDTC-Based STATCOM," Energies, MDPI, vol. 18(15), pages 1-21, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4150-:d:1717900
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