DC-Link Voltage Balancing Modulation for Cascaded H-Bridge Converters

Youngjong Ko; Anatolii Tcai; Marco Liserre

doi:10.1109/ACCESS.2021.3098896

IEEE Access (Jan 2021)

DC-Link Voltage Balancing Modulation for Cascaded H-Bridge Converters

Youngjong Ko,
Anatolii Tcai,
Marco Liserre

Affiliations

Youngjong Ko: ORCiD; Department of Electrical Engineering and Industry 4.0~Convergence Bionics Engineering, Pukyong National University, Busan, South Korea
Anatolii Tcai: ORCiD; Chair of Power Electronics, Christian-Albrechts-University of Kiel, Kiel, Germany
Marco Liserre: ORCiD; Chair of Power Electronics, Christian-Albrechts-University of Kiel, Kiel, Germany

DOI: https://doi.org/10.1109/ACCESS.2021.3098896
Journal volume & issue: Vol. 9
pp. 103524 – 103532

Abstract

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Cascaded H-Bridge (CHB) converters have been widely employed in various applications, providing the advantages of modularity and multilevel voltage output. However, technically the CHB converters require isolated DC-link buses, which need to be regulated individually. In this context, a control scheme for the CHB converters features the voltage balancing algorithm. The voltage balancing control is typically performed by PI controller, where its control capability is limited by linear modulation region. In this work, the modulation based voltage balancing algorithm is proposed, which extends the balancing control capability and improves the dynamic performance. The proposed method is theoretically analyzed and validated through the simulation and experimental results.

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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