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A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM

Author

Listed:
  • Jingyuan Yin

    (Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100044, China)

  • Wen Wu

    (National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China)

  • Tongzhen Wei

    (Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100044, China)

  • Xuezhi Wu

    (National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China)

  • Qunhai Huo

    (Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100044, China)

Abstract

Each arm of modular multilevel converter (MMC) consists of a large number of sub-module (SM) units. However, it also increases the probability of SM failure during the long-term system operation. Focusing on the fault-tolerant operation issue for the MMC under SM faults, the traditional zero-sequence voltage injection fault-tolerant control algorithm is analyzed detailed and its disadvantages are concluded. Based on this, a novel fault-tolerant control strategy based on phase disposition pulse-width modulation (PD-PWM) is proposed in this paper, which has three main benefits: (i) it has carrier and modulation wave dual correction mechanism, which control ability is more higher and flexible; (ii) it only needs to inject zero-sequence voltage in half a cycle of the modulation wave, which simplifies the complexity of traditional zero-sequence voltage injection control algorithms and much easier for implement; (iii) furthermore, the zero-sequence voltage can even be avoided injecting under the symmetrical fault conditions. Finally, the effectiveness of the proposed control strategy is verified with the simulation and experiment studies under different fault conditions.

Suggested Citation

  • Jingyuan Yin & Wen Wu & Tongzhen Wei & Xuezhi Wu & Qunhai Huo, 2018. "A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM," Energies, MDPI, vol. 12(1), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:12:y:2018:i:1:p:20-:d:192464
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    References listed on IDEAS

    as
    1. Wen Wu & Xuezhi Wu & Jingyuan Yin & Long Jing & Shuai Wang & Jinke Li, 2017. "Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults," Energies, MDPI, vol. 10(11), pages 1-22, November.
    2. Dan Wang & Jiawei Yang & Zhu Chen & Chengxiong Mao & Jiming Lu, 2016. "A Transformerless Medium Voltage Multiphase Motor Drive System," Energies, MDPI, vol. 9(5), pages 1-14, April.
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