模块化多电平变换器上、下桥臂不对称运行环流重复控制

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摘要模块化多电平变换器（MMC）以其模块化、可扩展和便于冗余容错设计等优势在高压直流输电等大功率场合得到了很多应用。然而,采用大量电力电子元器件使可靠性成为制约MMC发展的主要因素,而通过设置备用子模块进而实现容错运行成为提高其可靠性的主要手段。针对含备用子模块MMC发生子模块故障导致上、下桥臂不对称运行的情况,本文通过理论分析表明,环流中不仅包含了偶次谐波成分,还包含了不对称运行产生的奇次谐波成分。据此,本文采用改进的环流重复控制器,在实现MMC故障后容错运行的同时,还实现了对环流各次谐波成分的有效抑制。所提出的环流重复控制器,不仅适用于上、下桥臂不对称工况,也适用于对称工况。因此,故障前后无需进行控制器的切换,降低了容错控制的复杂度。本文通过搭建单相MMC硬件平台,验证了所提控制策略的有效性。

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	李凯
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	袁立强

关键词 ：模块化多电平变换器, 子模块故障, 不对称运行, 环流重复控制

Abstract：Due to the advantages of modularity, scalability and redundancy, modular multilevel converter (MMC) has been widely used in the high power applications such as HVDC transmission. However, the reliability becomes one of the most important challenges for MMC which is composed of a large number of power electronics components. To increase the reliability of MMC, the reserved sub-modules (SMs) are often utilized to realize the fault-tolerant operation. Considering MMC with the reserved SMs, the SM failures will cause the asymmetrical operation of the upper and the lower arms. Through detailed analysis in this paper, it can be concluded that there are not only even-order harmonics, but also odd-order harmonics in the circulating current under asymmetrical operation conditions. Accordingly, an improved repetitive controller of the circulating current is proposed in this paper, which guarantees not only the fault-tolerant operation of MMC, but also the suppression of all the harmonics in the circulating current. Whether MMC operates in the symmetrical or the asymmetrical condition, the repetitive controller can both work. Therefore, there is no need to switch controllers after the fault, which reduces the complexity of the fault-tolerant control. Experiments based on a downscaled single-phase MMC prototype have verified the effectiveness of the proposed control strategy.

Key words： Modular multilevel converter sub-module failure unsymmetrical operation repetitive circulating current control

收稿日期: 2016-08-29 出版日期: 2016-11-01

PACS:

TM46

基金资助:国家自然科学基金重大项目资助（51490680、51490683）

作者简介: 李凯男,1988年生,博士研究生,研究方向为面向可靠性的模块化多电平变换器的控制。E-mail: kevinlee1988@126.com;赵争鸣男,1959年生,教授,博士生导师,研究方向为大容量电力电子变换系统、光伏发电、电机控制等。E-mail: zhaozm@tsinghua.edu.cn（通信作者）

引用本文:

李凯, 赵争鸣, 袁立强. 模块化多电平变换器上、下桥臂不对称运行环流重复控制[J]. 电工技术学报, 2016, 31(20): 122-129. Li Kai, Zhao Zhengming, Yuan Liqiang. Repetitive Control of Circulating Current in MMC with Asymmetrical Operation of Upper and Lower Arms. Transactions of China Electrotechnical Society, 2016, 31(20): 122-129.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I20/122

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