| 引用本文: | 阳莉汶,江伟,王渝红,陈金祥,李兴源,黄道姗.具有直流故障阻断能力的电容嵌位子模块拓扑及其特性[J].电力自动化设备,2017,37(12): |
| YANG Liwen,JIANG Wei,WANG Yuhong,CHEN Jinxiang,LI Xingyuan,HUANG Daoshan.Capacitor-embedded submodule topology with DC fault blocking capability and its characteristics[J].Electric Power Automation Equipment,2017,37(12): |
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| 摘要: |
| 针对半桥子模块无法清除直流故障电流的问题，提出了一种具有直流故障阻断能力的新型电容嵌位子模块拓扑。正常运行时，子模块中各IGBT均衡导通，无需采用具有特殊通流能力的附加功率器件；当发生直流故障时，闭锁子模块中所有IGBT通过子模块中的电容提供反向电压来阻断交流系统能量的馈入。IGBT闭锁后，利用二极管的单向导通性抑制桥臂电抗器的续流作用，具有较强的故障电流阻断能力。在PSCAD/EMTDC仿真平台上进行了仿真分析，验证了提出的电容嵌位子模块比全桥子模块、箝位双子模块具有更好的直流故障阻断能力。 |
| 关键词: 模块化多电平换流器 电容嵌位子模块 拓扑结构 直流故障 架空线 |
| DOI：10.16081/j.issn.1006-6047.2017.12.024 |
| 分类号:TM46 |
| 基金项目:国家电网公司科技项目(52130415000M) |
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| Capacitor-embedded submodule topology with DC fault blocking capability and its characteristics |
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YANG Liwen1, JIANG Wei2, WANG Yuhong1, CHEN Jinxiang2, LI Xingyuan1, HUANG Daoshan2
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1.School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China;2.State Grid Electric Power Research Institute of Fujian Electric Power Company, Fuzhou 350007, China
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| Abstract: |
| Considering the fact that HBSMs(Half-Bridge SubModules) cannot eliminate DC fault current, a novel CESM(Capacitor-Embedded SubModule) topology with DC fault blocking capability is proposed. Under normal conditions, there is no extra requirement for equipments with special flow capacity because of IGBTs’ equilibrium conduction. When a DC fault happens, all IGBTs of CESMs block, and submodule capacitors are inserted in series, which can provide a reverse voltage to block the fault current feeding from AC side. When IGBTs block, the after-follow current caused by bridge arm reactor can be suppressed by the unidirectional conductivity of submodule diodes. The simulative results based on PSCAD/EMTDC platform demonstrate that CESMs exhibit superior performance than FBSMs(Full-Bridge SubModules) and CDSMs(Clamp Double SubModules) in aspects of blocking the DC fault current. |
| Key words: modular multilevel converter capacitor-embedded submodule topology DC fault overhead lines |
