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

Tong Zheng; Congzhe Gao; Xiangdong Liu; Xiaozhong Liao; Jun Liang; Zhen Chen; Baiyan Sun; Jingliang Lv

doi:10.1109/TPEL.2020.2997991

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

Tong Zheng, Congzhe Gao^*, Xiangdong Liu, Xiaozhong Liao, Jun Liang, Zhen Chen, Baiyan Sun, Jingliang Lv

^*Corresponding author for this work

School of Automation

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

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.

Original language	English
Article number	9102398
Pages (from-to)	1399-1411
Number of pages	13
Journal	IEEE Transactions on Power Electronics
Volume	36
Issue number	2
DOIs	https://doi.org/10.1109/TPEL.2020.2997991
Publication status	Published - Feb 2021

Keywords

Modular multilevel converter (MMC)
voltage balancing control
voltage self-balancing

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10.1109/TPEL.2020.2997991

Cite this

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abstract = "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.",

keywords = "Modular multilevel converter (MMC), voltage balancing control, voltage self-balancing",

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AU - Gao, Congzhe

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AU - Liao, Xiaozhong

AU - Liang, Jun

AU - Chen, Zhen

AU - Sun, Baiyan

AU - Lv, Jingliang

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AB - 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.

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

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Keywords

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