MMC-HVDC混合阻断拓扑直流故障抑制

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摘要如何处理直流侧短路故障是电压源换流器型直流输电面临的一个技术难题。首先根据模块化多电平换流器的直流故障抑制机理对改进型子模块拓扑特点进行总结概括,针对其存在问题设计了额外功率损耗为零的反向阻断型半桥子模块拓扑及其构成混合子模块拓扑。然后根据回路电压方程研究混合子模块拓扑直流故障抑制特性,分析了子模块内电容电压平衡问题,设计了系统自励启动策略。最后在PSCAD/EMTDC中搭建模型,对混合拓扑启动流程及直流故障抑制特性进行了仿真证明。

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	张建坡
	颜湘武
	田新成

关键词 ：模块化多电平换流器, 反向阻断, 混合子模块, 电压平衡, 自励启动

Abstract：How to deal with DC link fault has been a technical problem for the voltage source converter based HVDC. Several kinds of improved sub-module topologies were summarized firstly in this paper based on modular multilevel converter (MMC) DC fault suppressing mechanism. An improved sub-module and a hybrid sub-module with reverse-blocking half-bridge topologies were designed to solve the additional power consumption problem. Then according to the circuit voltage equation, the DC fault suppressing characteristics and sub-module capacitor voltage balancing problem were analyzed. What’s more, a self-startup method was also designed. Lastly, the simulation model built in PSCAD/EMTDC has verified the self-startup process and DC link fault suppressing features.

Key words： Modular multilevel converter reverse-blocking hybrid sub module voltage balance self-startup

收稿日期: 2016-06-02 出版日期: 2017-05-26

PACS:

TM46

基金资助:国家高技术研究发展计划（863计划）（2015AA050603）和河北省自然科学基金（E2015502046）资助项目

通讯作者: 张建坡男,1973年生,博士,讲师,研究方向为高压直流输电与柔性输配电技术。E-mail: zhangjianpo@126.com

作者简介: 颜湘武男,1965年生,教授,博士生导师,研究方向为新能源电力系统、现代电力变换、新型储能与节能。E-mail: xiangwuy@ncepu.edu.cn

引用本文:

张建坡, 颜湘武, 田新成. MMC-HVDC混合阻断拓扑直流故障抑制[J]. 电工技术学报, 2017, 32(10): 61-68. Zhang Jianpo, Yan Xiangwu, Tian Xingcheng. MMC-HVDC Hybrid Blocking Topologies for Suppressing DC Fault. Transactions of China Electrotechnical Society, 2017, 32(10): 61-68.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I10/61

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