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Optimal Design of a Submodule Capacitor in a Modular Multilevel Converter for Medium Voltage Motor Drives

Author

Listed:
  • Van-Thang Nguyen

    (Department of Energy and Power Conversion Engineering, University of Science & Technology, Daejeon 34113, Republic of Korea)

  • Ji-Won Kim

    (Department of Energy and Power Conversion Engineering, University of Science & Technology, Daejeon 34113, Republic of Korea
    Electric Machines and Drives Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Republic of Korea)

  • Jae-Woon Lee

    (Electric Machines and Drives Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Republic of Korea)

  • Byoung-Gun Park

    (Department of Energy and Power Conversion Engineering, University of Science & Technology, Daejeon 34113, Republic of Korea
    Electric Machines and Drives Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Republic of Korea)

Abstract

This paper proposes an algorithm for determining the optimal capacitance by utilizing a mathematical model of a submodule (SM) capacitor in a modular multilevel converter (MMC) specifically for medium voltage motor drives (MVDs). By approximating the voltage fluctuation of the SM capacitor during low-frequency operation, it is feasible to ascertain the minimum capacitance required for the SM capacitor, ensuring that its voltage fluctuations remain within an acceptable limit that is predefined as a specified value. Moreover, the study considered the injection of both a high-frequency common-mode voltage (CMV) and a circulating current to alleviate the SM voltage fluctuation during the acceleration of motor drives. The effectiveness of the proposed method is validated through verification using time-domain simulation results obtained using the MATLAB/SIMULINK software and real-time simulation results acquired using the OPAL-RT simulator platform.

Suggested Citation

  • Van-Thang Nguyen & Ji-Won Kim & Jae-Woon Lee & Byoung-Gun Park, 2024. "Optimal Design of a Submodule Capacitor in a Modular Multilevel Converter for Medium Voltage Motor Drives," Energies, MDPI, vol. 17(2), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:471-:d:1321456
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