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Fault-Tolerant Control Strategies and Capability without Redundant Sub-Modules in Modular Multilevel Converters

Author

Listed:
  • Jinke Li

    (China Energy Engineering Group Jiangsu Power Design Institute Co., LTD, Nanjing 211102, China)

  • Jingyuan Yin

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

Abstract

Sub-module (SM) faults in modular multilevel converters (MMCs) without redundancies result in unbalanced converter output voltages and improper control of modulation due to an unequal number of SMs inserted between the different phase-legs. The derived mathematics model of the MMC demonstrates the impact of the SM fault in the circulating currents and capacitor voltages. For achieving the SM fault-tolerance, detailed analysis of the MMC’s electrical quantities under SM fault-tolerant algorithms is provided together with two modulation reconfiguration techniques for maintaining voltage balance. Fault-tolerant abilities of the two modulation algorithms are also discussed and defined. Simulation results from a 21-level converter and experimental work in a three-phase five-level converter demonstrate the feasibility and performance of the proposed fault-tolerant control strategies.

Suggested Citation

  • Jinke Li & Jingyuan Yin, 2019. "Fault-Tolerant Control Strategies and Capability without Redundant Sub-Modules in Modular Multilevel Converters," Energies, MDPI, vol. 12(9), pages 1-21, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1726-:d:228986
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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.
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    Cited by:

    1. Gianluca Brando & Efstratios Chatzinikolaou & Dan Rogers & Ivan Spina, 2021. "Electrochemical Cell Loss Minimization in Modular Multilevel Converters Based on Half-Bridge Modules," Energies, MDPI, vol. 14(5), pages 1-14, March.
    2. 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.

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