A Novel Z-Type Modular Multilevel Converter With Capacitor Voltage Self-Balancing for Grid-Tied Applications

The modular multilevel converter (MMC) has been proven to be an effective solution for grid-tied applications with medium/high voltage ratings. The MMC contains a large amount of floating capacitors, which require the voltage balancing control. The voltage balancing control complexity is normally in...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2021-02, Vol.36 (2), p.1399-1411
Main Authors: Zheng, Tong, Gao, Congzhe, Liu, Xiangdong, Liao, Xiaozhong, Liang, Jun, Chen, Zhen, Sun, Baiyan, Lv, Jingliang
Format: Article
Language:English
Subjects:
Balancing
Capacitors
Clamps
Converters
Inductors
Mathematical analysis
Modular multilevel converter (MMC)
Switches
Switching circuits
Topology
voltage balancing control
Voltage control
voltage self-balancing
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Description
Summary:The modular multilevel converter (MMC) has been proven to be an effective solution for grid-tied applications with medium/high voltage ratings. The MMC contains a large amount of floating capacitors, which require the voltage balancing control. The voltage balancing control complexity is normally increased with the number of floating capacitors. As a result, the computation burden of the controller as well as the corresponding hardware cost will be high. This article proposed a novel Z-type MMC, which can achieve capacitor voltage self-balancing without any balancing control. Therefore, the overall control of the converter is significantly simplified. Both mathematical analysis and experimental results have confirmed the effectiveness of the proposed method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2020.2997991