Arm voltage balancing control of modular multilevel resonant converter

Modular multilevel resonant converter is an promising candidate for high voltage applications since it has advantageous features, such as high efficiency, high voltage capability and easy fault-tolerant operation. However, the inequality of arm inductance in practice will lead to imbalance between t...

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Bibliographic Details
Published inCES transactions on electrical machines and systems (Online Vol. 4; no. 4; pp. 303 - 308
Main Authors Jianjia Zhang, Shuai Shao, Yucen Li, Junming Zhang, Kuang Sheng
Format Journal Article
LanguageEnglish
Published China Electrotechnical Society 01.12.2020
Subjects
arm voltage balancing
duty cycle
modular multilevel resonant (mmr) converter
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Summary:Modular multilevel resonant converter is an promising candidate for high voltage applications since it has advantageous features, such as high efficiency, high voltage capability and easy fault-tolerant operation. However, the inequality of arm inductance in practice will lead to imbalance between the upper and lower arm voltages, which will induce large ripples in the circulating current and a dc bias on the voltage generated by modular circuits. To compensate for the voltage imbalance, effects of arm duty cycle changes on arm voltages are discussed. An arm voltage balancing control method is proposed: adjust arm duty cycle according to arm voltage deviation in every switching cycle. Simulation and experimental results are presented to validate the theoretical analysis and the proposed control method.
ISSN:2096-3564
2837-0325
DOI:10.30941/CESTEMS.2020.00037