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A Fault-Tolerant Control Strategy of Modular Multilevel Converter with Sub-Module Faults Based on Neutral Point Compound Shift

Author

Listed:
  • Qinyue Zhu

    (Department of Electrical Engineering, Tongji University, Shanghai 201804, China)

  • Wei Dai

    (Department of Electrical Engineering, Tongji University, Shanghai 201804, China)

  • Lei Guan

    (Department of Electrical Engineering, Tongji University, Shanghai 201804, China
    Pan Asia Technical Automotive Center Co., Ltd., Shanghai 201201, China)

  • Xitang Tan

    (Department of Electrical Engineering, Tongji University, Shanghai 201804, China)

  • Zhaoyang Li

    (Department of Electrical Engineering, Tongji University, Shanghai 201804, China)

  • Dabo Xie

    (Department of Electrical Engineering, Tongji University, Shanghai 201804, China)

Abstract

In view of the complex calculation and limited fault tolerance capability of existing neutral point shift control algorithms, this paper studies the fault-tolerant control method for sub-module faults in modular multilevel converters on the basis of neutral point compound shift control strategy. In order to reduce the calculation complexity of shift parameters in the traditional strategy and simplify its implementation, an improved AC side phase voltage vector reconstruction method is proposed, achieving online real-time calculation of the modulation wave adjustment parameters of each phase required for fault-tolerant control. Based on this, a neutral point DC side shift control method is proposed to further improve the fault tolerance capability of the modular multilevel converter (MMC) system by compensating the fault phase voltage with non-fault phase voltage. By means of the compound shift control strategy of the DC side and AC side of the neutral point, an optimal neutral point position is selected to ensure that the MMC system output line voltage is symmetrical and the amplitude is as large as possible after fault-tolerant control. Finally, the effectiveness and feasibility of the proposed control strategy are verified by simulation and low-power MMC experimental system testing.

Suggested Citation

  • Qinyue Zhu & Wei Dai & Lei Guan & Xitang Tan & Zhaoyang Li & Dabo Xie, 2019. "A Fault-Tolerant Control Strategy of Modular Multilevel Converter with Sub-Module Faults Based on Neutral Point Compound Shift," Energies, MDPI, vol. 12(5), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:876-:d:211558
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    References listed on IDEAS

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    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. Yiqi Liu & Danhua Li & Yu Jin & Qingbo Wang & Wenlong Song, 2018. "Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter," Energies, MDPI, vol. 11(6), pages 1-18, May.
    3. Fayun Zhou & An Luo & Yan Li & Qianming Xu & Zhixing He & Josep M. Guerrero, 2017. "Double-Carrier Phase-Disposition Pulse Width Modulation Method for Modular Multilevel Converters," Energies, MDPI, vol. 10(4), pages 1-23, April.
    4. Miguel Moranchel & Francisco Huerta & Inés Sanz & Emilio Bueno & Francisco J. Rodríguez, 2016. "A Comparison of Modulation Techniques for Modular Multilevel Converters," Energies, MDPI, vol. 9(12), pages 1-20, December.
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    Cited by:

    1. Stefano Farnesi & Mario Marchesoni & Massimiliano Passalacqua & Luis Vaccaro, 2019. "Solid-State Transformers in Locomotives Fed through AC Lines: A Review and Future Developments," Energies, MDPI, vol. 12(24), pages 1-29, December.
    2. Pawel Szczesniak, 2019. "Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link," Energies, MDPI, vol. 12(8), pages 1-18, April.

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