模块化多电平换流器改进拓扑结构及其应用

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摘要模块化多电平换流器（MMC）作为实现多电平换流器的一种新的拓扑结构,具有高度模块化、维护间隔长、输出波形谐波含量低等优点,因此在中高压电能变换和高压直流输电领域得到了广泛的应用和研究。而传统的半桥型子模块结构在直流侧发生故障的时候,由于所并联前向二级管原因,当IGBT闭锁时,不能够实现直流侧故障电流的阻断功能,从而对其应用带来了一定的不利影响。本文总结了现有的子模块拓扑结构的特点,通过分析MMC直流侧故障时桥臂电流与模块电容的充放电关系,对传统的半桥型子模块拓扑结构进行了改进,设计了串联双子模块闭锁拓扑结构,从而在不影响控制策略的基础上实现了直流侧故障电流阻断功能。最后以改进型拓扑结构为例,搭建了仿真模型,对直流侧故障特性以及相应的控制策略进行了分析验证。

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	张建坡
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	黄晓明
	陆翌
	裘鹏

关键词 ：模块化多电平换流器, 高电压直流输电, 子模块拓扑, 串联双子模块, 直流电流阻断

Abstract：Modular multilevel converter(MMC) based on cascaded connection of sub modules per phase arm is a newly introduced topology of multilevel converter for multilevel converters with potential for medium voltage and high voltage applications with advantages as high modularity, longer maintenance intervals, low generation of harmonics, etc. However, MMC by itself, is defenseless against DC faults, during such faults, the anti-parallel diodes conduct as rectifier bridges because the fault current continues to be fed, and so the application especially in the high voltage direct current (HVDC) transmission is affected. In this paper, different topologies of sub modules(SM) of MMC are analyzed, according to the relationship between arm current and the capacitance voltage, the series connected double SM(SDSM) is designed, the DC current blocked capability is realized without changing the control strategy. At last, the simulation model is built based on this new topology, the DC current fault characters and the control strategy is analyzed.

Key words： Modular multilevel converter high voltage direct current sub module topology series connected double sub module DC current block

收稿日期: 2013-05-27 出版日期: 2014-11-05

PACS:	TM721
	TM46

基金资助:国家自然科学基金重点项目（51207054）和国家高技术研究发展计划（863计划）（2013AA050105）资助项目

作者简介: 张建坡男,1973年生,博士研究生,讲师,研究方向为高压直流输电与柔性输配电技术；赵成勇男,1964年生,教授,博士生导师,研究方向为高压直流输电与柔性输配电技术、电能质量分析与控制。

引用本文:

张建坡, 赵成勇, 孙海峰, 黄晓明, 陆翌, 裘鹏. 模块化多电平换流器改进拓扑结构及其应用[J]. 电工技术学报, 2014, 29(8): 173-179. Zhang Jianpo, Zhao Chengyong, Sun Haifeng, Huang Xiaoming, Lu Yi, Qiu Peng. Improved Topology of Modular Multilevel Converter and Application. Transactions of China Electrotechnical Society, 2014, 29(8): 173-179.

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http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I8/173

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