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A New MMC Sub-Module Topology with DC Fault Blocking Capability and Capacitor Voltage Self-Balancing Capability

Author

Listed:
  • Yuqi Pang

    (School of Electrical & Automation Engineering, Nanjing Normal University, Nanjing 210046, China)

  • Gang Ma

    (School of Electrical & Automation Engineering, Nanjing Normal University, Nanjing 210046, China)

  • Xunyu Liu

    (School of Electrical & Automation Engineering, Nanjing Normal University, Nanjing 210046, China)

  • Xiaotian Xu

    (School of Electrical & Automation Engineering, Nanjing Normal University, Nanjing 210046, China)

  • Xinyuan Zhang

    (School of Electrical & Automation Engineering, Nanjing Normal University, Nanjing 210046, China)

Abstract

A large number of modular multilevel converters (MMC) are connected to HVDC transmission systems nowadays. This paper aims at the short-circuit fault in the DC line of the HVDC transmission system and the problem of capacitor voltage imbalance in MMC, proposing a new type of MMC sub-module, which has both the DC fault self-clearing ability and the capacitor voltage self-balancing ability. This sub-module combines the topology of half bridge and full bridge. It uses the reverse capacitor voltage to forcibly turn off the conducting diode to block the fault current loop. At the same time, the two capacitances charge and discharge states are consistent by utilizing the operating mode of the sub-module. It is possible to directly achieve a self-balancing capacitor voltage without complex balancing voltage control. The MATLAB/Simulink simulation verifies the effectiveness of the DC fault blocking capability and capacitor voltage balance capability of the proposed sub-module.

Suggested Citation

  • Yuqi Pang & Gang Ma & Xunyu Liu & Xiaotian Xu & Xinyuan Zhang, 2021. "A New MMC Sub-Module Topology with DC Fault Blocking Capability and Capacitor Voltage Self-Balancing Capability," Energies, MDPI, vol. 14(12), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3409-:d:571903
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    References listed on IDEAS

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    1. Ricardo Vidal-Albalate & Jaume Forner, 2020. "Modeling and Enhanced Control of Hybrid Full Bridge–Half Bridge MMCs for HVDC Grid Studies," Energies, MDPI, vol. 13(1), pages 1-26, January.
    2. Geon Kim & Jin Sung Lee & Jin Hyo Park & Hyun Duck Choi & Myoung Jin Lee, 2021. "A Zero Crossing Hybrid Bidirectional DC Circuit Breaker for HVDC Transmission Systems," Energies, MDPI, vol. 14(5), pages 1-12, March.
    3. Zheng Xu & Huangqing Xiao & Liang Xiao & Zheren Zhang, 2018. "DC Fault Analysis and Clearance Solutions of MMC-HVDC Systems," Energies, MDPI, vol. 11(4), pages 1-16, April.
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    Cited by:

    1. Yumeng Tian & Harith R. Wickramasinghe & Zixin Li & Josep Pou & Georgios Konstantinou, 2022. "Review, Classification and Loss Comparison of Modular Multilevel Converter Submodules for HVDC Applications," Energies, MDPI, vol. 15(6), pages 1-32, March.

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