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Common-Mode Voltage Reduction of Modular Multilevel Converter Using Adaptive High-Frequency Injection Method for Medium-Voltage Motor Drives

Author

Listed:
  • Jae-Woon Lee

    (Electric Machines and Drives Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, Republic of Korea
    School of Electrical Engineering, Pusan National University, Busan 46241, Republic of Korea)

  • Ji-Won Kim

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

  • Chee-Woo Lee

    (School of Electrical Engineering, Pusan National University, Busan 46241, Republic of Korea)

  • Byoung-Gun Park

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

Abstract

This study proposes an adaptive high-frequency injection method (AHFI) aimed at mitigating common-mode voltage (CMV) on the AC side and alleviating current stress on power semiconductor devices within each arm of a medium-voltage motor propulsion system designed for modular multilevel converters. By adjusting the quantity of high-frequency components injected into each arm according to the fluctuation coefficient, the amplitude of injected high-frequency CMV and circulating currents can be reduced across medium to rated motor speeds. This approach enhances the start-up performance of medium-voltage motor drives while diminishing CMV effects on the motor side, resulting in decreased total harmonic distortion (THD) in the three-phase output waveforms. Furthermore, the effectiveness of the proposed AHFI method in SM voltage regulation and circulating current control under low-frequency operation is thoroughly analyzed. The validity of this method is established through comprehensive mathematical scrutiny and time–domain simulations performed using MATLAB/SIMULINK software (MATLAB version R2021b), along with real-time simulations conducted employing the real-time simulator OPAL/RT via hardware-in-the-loop simulation (HILS).

Suggested Citation

  • Jae-Woon Lee & Ji-Won Kim & Chee-Woo Lee & Byoung-Gun Park, 2024. "Common-Mode Voltage Reduction of Modular Multilevel Converter Using Adaptive High-Frequency Injection Method for Medium-Voltage Motor Drives," Energies, MDPI, vol. 17(6), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1367-:d:1355785
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