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

Duc Dung Le; Dong-Choon Lee

doi:10.1109/ACCESS.2020.3027844

IEEE Access (Jan 2020)

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

Duc Dung Le,
Dong-Choon Lee

Affiliations

Duc Dung Le: ORCiD; Department of Electrical Engineering, Yeungnam University, Gyeongbuk, South Korea
Dong-Choon Lee: ORCiD; Department of Electrical Engineering, Yeungnam University, Gyeongbuk, South Korea

DOI: https://doi.org/10.1109/ACCESS.2020.3027844
Journal volume & issue: Vol. 8
pp. 180076 – 180086

Abstract

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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.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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