Analysis and Control of Three-Phase Modular Multilevel Converters Under the Single Arm Fault Condition

Analysis and Control of Three-Phase Modular Multilevel Converters Under the Single Arm Fault Condition
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三相模块化多电平变流器单臂故障情况分析与控制

DOI:
10.1109/tpel.2019.2906897
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发表时间:
2019-03
影响因子:
6.7
通讯作者:
Li Yongdong
Li Yongdong
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang Chao;Wang Kui;Zheng Zedong;Yang Bo;Sun Kai;Li Yongdong

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模块化多电平转换器(MMC)由于具有高度模块化、易于扩展、高质量输出电压和子模块容错等优点,对于中压和高压应用来说是一种有吸引力的拓扑。本文重点研究单臂故障情况下三相MMC的控制,可以进一步提高MMC的容错能力。根据MMC的三个基本运行约束,本文针对单臂故障MMC提出了一种可行的臂电压和电流配置方法,可以保证其在降低输出功率的情况下稳定运行。还讨论了一些操作限制。给出了基于每个臂有四个半桥子模块的原型的实验结果,以验证所提出的臂容错方法。
Modular multilevel converter (MMC) is an attractive topology for medium- and high-voltage applications due to the merits of high modularity, easy scalability, high-quality output voltage, and fault tolerance of submodules. This letter focuses on the control of a three-phase MMC under the single arm fault condition, which can further improve the fault tolerance ability of the MMC. According to three essential operating constraints of the MMC, this letter proposes a feasible arm voltage and current configuration method for the single arm failed MMC, which can guarantee its stable operation with reduced output power. Several operating limitations are also discussed. Experiment results based on a prototype with four half-bridge submodules per arm are presented to verify the proposed arm fault tolerance method.
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