Reduction of Half-Arm Current Stresses and Flying-Capacitor Voltage Ripples of Flying-Capacitor MMCs

IEEE Access

Dong-Choon Lee¹  Duc Dung Le¹ 

[1] Department of Electrical Engineering, Yeungnam University, Gyeongbuk, South Korea;

关键词: Arm current;    medium-voltage motor drive;    modular multilevel converters (MMC);    submodule (SM) capacitor voltage ripple;   

DOI  :  10.1109/ACCESS.2020.3027844

来源: DOAJ

【 摘 要 】

In this paper, a new control scheme that can reduce the current stresses on switching devices, flying capacitors, and inductors for flying-capacitor modular multilevel converters (FC-MMCs) is proposed, which is based on redistribution of power difference between upper and lower arms through the flying capacitors. In addition, a way to determine the frequency range of the square-wave voltage to be injected into the FC-MMC is suggested, which is able to improve the current control performance and reduce the flying-capacitor voltage ripples. The effectiveness of the proposed control scheme has been verified for a 4160-V/1-MW simulation model and a 230-V/3-kW prototype of the FC-MMC.

【 授权许可】

Unknown