电工技术学报2017，Vol.32Issue(10)：53-60,68,9.
双极MMC-HVDC系统直流故障特性研究
Study on Characteristics of DC Fault in Bipolar MMC-HVDC System
摘要
Abstract
DC fault is one of the main fault types in modular multilevel converter based HVDC (MMC-HVDC). The current research has mainly focused on pseudo bipolar system, while the research of DC fault in bipolar system is still in the initial stage. Hence, this paper introduces the topology and working principle of MMC in bipolar system. For the bipolar and pseudo bipolar systems, the corresponding equivalent circuits of MMC-HVDC system during DC fault are built respectively according to electrical parameters of AC/DC system, the discharging mechanism of sub-module capacitance and inductor on bridge arms. The effects of fault current on bridge arm valve group in bipolar and pseudo bipolar systems are compared, and the relationship between three electrical parameters and fault current is described. Finally, a 51-level bipolar MMC-HVDC model is set up in RT-LAB. The simulation results validate the method of DC fault characteristics.关键词
高压直流输电/模块化多电平换流器/直流故障/故障分析Key words
HVDC transmission/modular multilevel converter (MMC)/DC faults/fault analysis分类
信息技术与安全科学引用本文复制引用
陈继开,孙川,李国庆,李扬,李江..双极MMC-HVDC系统直流故障特性研究[J].电工技术学报,2017,32(10):53-60,68,9.基金项目
国家重点研发计划(2016YFB0900903)、国家留学基金(20165113)和吉林市科技计划(20156407)资助项目. （2016YFB0900903）
