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

Jae-Woon Lee, Ji-Won Kim (), Chee-Woo Lee () and Byoung-Gun Park
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Jae-Woon Lee: Electric Machines and Drives Research Center, Korea Electrotechnology Research Institute, Changwon-si 51543, 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

Energies, 2024, vol. 17, issue 6, 1-21

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).

Keywords: modular multilevel converter (MMC); medium-voltage motor drive; adaptive high-frequency injection (AHFI); fluctuation coefficient; common-mode voltage (CMV); arm current stress (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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