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<p>The cascaded modular multilevel converter (MMC) and cycloconverter (CCV) machine drive system shows potential in medium/high voltage machine drives due to its low capacitor voltage ripple at low speed. However, the insulated gate bipolar transistors (IGBTs) and diodes of the MMC and the thyristors of the CCV result in power loss and operation cost. In this paper, a power loss reduction operation (PLRO) is proposed to reduce the total device power loss of the cascaded drive system. The proposed PLRO selects the optimized ac-link voltage amplitude according to the machine speed, then the modulation ratios of the MMC/CCV and commutation process of the thyristors in the CCV are jointly adjusted to reduce the total power loss. The effects of ac-link voltage on the modulation and device power losses are discussed, then the selection range of the ac-link voltage is analyzed based on a 6.6&#xa0;kV/5&#xa0;MW cascaded drive system. Simulation and experiment results are provided to verify the feasibility of proposed method.</p>

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Power loss reduction operation using dynamic AC-link voltage for cascaded MMC-CCV machine drive systems

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Yue Zhang,
  • Fujin Deng,
  • Sunqing Wang,
  • Hengchi Zheng,
  • Jimin Chen,
  • Jie Zhang,
  • Zhao Yu

摘要

The cascaded modular multilevel converter (MMC) and cycloconverter (CCV) machine drive system shows potential in medium/high voltage machine drives due to its low capacitor voltage ripple at low speed. However, the insulated gate bipolar transistors (IGBTs) and diodes of the MMC and the thyristors of the CCV result in power loss and operation cost. In this paper, a power loss reduction operation (PLRO) is proposed to reduce the total device power loss of the cascaded drive system. The proposed PLRO selects the optimized ac-link voltage amplitude according to the machine speed, then the modulation ratios of the MMC/CCV and commutation process of the thyristors in the CCV are jointly adjusted to reduce the total power loss. The effects of ac-link voltage on the modulation and device power losses are discussed, then the selection range of the ac-link voltage is analyzed based on a 6.6 kV/5 MW cascaded drive system. Simulation and experiment results are provided to verify the feasibility of proposed method.