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Detailed Wideband Impedance Modeling and Resonance Analysis of Grid-Connected Modular Multilevel Converter

Author

Listed:
  • Zheng Yan

    (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)

  • Jianyuan Xu

    (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)

  • Gaole Yu

    (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)

  • Enming Bai

    (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)

  • Weidong Chen

    (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)

Abstract

Modular multilevel converter (MMC) tends to cause resonance instability in interconnected systems. Current studies on the stability of MMC mainly focus on high-voltage and large-capacity power systems, while the impedance modeling process of MMC ignores the harmonics of the submodule (SM) capacitor voltages and the influence of voltage feedforward control. The applicability of the MMC impedance model with fewer submodules is doubtful. According to the circuit structure and control mode, the AC-side sequence impedance model of the MMC is established, which takes into account the capacitor voltage balance control of submodules and voltage feedforward control. Based on the RT-Lab control hardware-in-loop (CHIL) test platform, the MMC impedance frequency scanning was carried out to verify the accuracy of the impedance modeling method. The influence of control parameters in different frequency bands on the impedance characteristics of MMC was studied. The AC terminal voltage feedforward causes phase lag in the mid-/high-frequency range and increases the risk of resonance. In the low-frequency range, the dynamics and control of capacitor voltages reduce the impedance magnitude of MMC. Using the resonance phenomenon of an MMC connected to a weak grid as an example, the high-frequency resonance mechanism caused by control parameters is analyzed from the perspective of the negative damping effect. The simulation results show that the detailed wideband impedance model can improve the accuracy of the stability analysis results.

Suggested Citation

  • Zheng Yan & Jianyuan Xu & Gaole Yu & Enming Bai & Weidong Chen, 2023. "Detailed Wideband Impedance Modeling and Resonance Analysis of Grid-Connected Modular Multilevel Converter," Energies, MDPI, vol. 16(12), pages 1-22, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:12:p:4782-:d:1173750
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    References listed on IDEAS

    as
    1. Tong Huang & Xin Chen, 2022. "Sequence Impedance Modeling and Optimization of MMC-HVDC Considering DC Voltage Control and Voltage Feedforward Control," Energies, MDPI, vol. 15(24), pages 1-16, December.
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    Cited by:

    1. Youzhuo Zheng & Long Hua & Yekui Yang & Chun Li & Chaoyi Luo & Zihong Song & Xingwu Yang & Haibo Feng, 2024. "Stability Enhancement Method of Standalone Modular Multilevel Converters Based on Impedance Reshaping," Energies, MDPI, vol. 17(4), pages 1-19, February.

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