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A Low Inrush Current Pre-Charging Strategy of M3C with Improved Nearest Level Modulation

Author

Listed:
  • Rufei He

    (Energy Storage Research Institute of Southern Power Grid Peak Shaving and Frequency Modulation Power Generation Co., Ltd., Guangzhou 511493, China)

  • Yikai Li

    (Energy Storage Research Institute of Southern Power Grid Peak Shaving and Frequency Modulation Power Generation Co., Ltd., Guangzhou 511493, China)

  • Yumin Peng

    (Energy Storage Research Institute of Southern Power Grid Peak Shaving and Frequency Modulation Power Generation Co., Ltd., Guangzhou 511493, China)

  • Yiming Ma

    (Energy Storage Research Institute of Southern Power Grid Peak Shaving and Frequency Modulation Power Generation Co., Ltd., Guangzhou 511493, China)

  • Fanqi Huang

    (Energy Storage Research Institute of Southern Power Grid Peak Shaving and Frequency Modulation Power Generation Co., Ltd., Guangzhou 511493, China)

  • Hailong Li

    (Shenzhen Hopewind Electric Co., Ltd., Shenzhen 518055, China)

  • Wei Luo

    (Department of Electrical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

Abstract

The modular multilevel matrix converter (M3C) can perform AC/AC conversion directly. However, M3C operation often requires a pre-charging process, which can be challenging due to the need for fast pre-charging with low inrush current. To address the issue, a closed-loop fast pre-charging strategy is proposed that utilizes an improved nearest level modulation (NLM) based on a quick-sorting algorithm for M3C. By improving the current limiting resistor and the number of Sub-Modules (SMs) inserted into the NLM, we achieve a reduction in inrush current when connected to the grid, and unlock the control algorithm, respectively. This paper presents the relationship between the current-limiting resistor, the pre-charging current, and the pre-charging time. Reactive power compensation is applied on the AC grid during the pre-charging process to ensure stability. Furthermore, the balanced control of capacitor voltage is employed to achieve synchronized and coordinated growth of capacitor voltages in SMs using a quick-sorting algorithm based on NLM. The simulation and experimental results demonstrate the effectiveness of this approach, making it suitable for M3C with a high number of SMs.

Suggested Citation

  • Rufei He & Yikai Li & Yumin Peng & Yiming Ma & Fanqi Huang & Hailong Li & Wei Luo, 2025. "A Low Inrush Current Pre-Charging Strategy of M3C with Improved Nearest Level Modulation," Energies, MDPI, vol. 18(11), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:11:p:2895-:d:1669192
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