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A Capacitance Monitoring Strategy Based on Offset Error Compensation for Modular Multilevel Converters

Author

Listed:
  • Huijie Jiang

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Fujin Deng

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China
    Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Southeast University, Nanjing 210096, China)

  • Huailong Li

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Jie Tian

    (NR Electric Company, Ltd., Nanjing 211102, China)

  • Yu Lu

    (NR Electric Company, Ltd., Nanjing 211102, China)

  • Gang Li

    (NR Electric Company, Ltd., Nanjing 211102, China)

Abstract

The modular multilevel converter (MMC) is a research hotspot in medium-voltage and high-voltage applications. The measurement offset error would cause an increase in the monitoring error of the submodule (SM) capacitance of the MMC, affecting the estimation accuracy of the SM capacitance monitoring. This paper proposes a capacitor monitoring strategy based on the offset error compensation, where two reasonable capacitor monitoring periods are selected in one fundamental period under the proposed voltage-balancing control (VBC) based on the virtual capacitor voltage (VCV) to compensate for the offset error impact on the capacitance monitoring. The proposed strategy can effectively eliminate the offset error impact on the capacitance monitoring, which ensures the accuracy of the SM capacitance monitoring in the MMCs. The effectiveness of the proposed monitoring strategy is confirmed by the simulations and experiments.

Suggested Citation

  • Huijie Jiang & Fujin Deng & Huailong Li & Jie Tian & Yu Lu & Gang Li, 2024. "A Capacitance Monitoring Strategy Based on Offset Error Compensation for Modular Multilevel Converters," Energies, MDPI, vol. 17(7), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:7:p:1771-:d:1371798
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