| 引用本文: | 张建坡,赵成勇.MMC-HVDC直流侧故障特性仿真分析[J].电力自动化设备,2014,34(7): |
| ZHANG Jianpo,ZHAO Chengyong.Simulation and analysis of DC-link fault characteristics for MMC-HVDC[J].Electric Power Automation Equipment,2014,34(7): |
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| 摘要: |
| 由于拓扑和调制策略的不同，基于模块化多电平换流器的高压直流输电（MMC-HVDC）系统在直流侧发生故障时呈现出与两电平电压源型直流输电（VSC-HVDC）系统不同的故障特性。在PSCAD／EMTDC中搭建的仿真模型基础上，首先分析了MMC-HVDC直流侧线路单极接地、断线和两极短路的故障特性及其对系统运行的影响；然后针对半桥型子模块结构不能够双向阻断故障电流的问题，对子模块拓扑进行了重新设计，通过改变流经子模块电流方向，实现了桥臂电容双向充电，从而提供了续流二极管阻断电压；最后对直流侧两极短路故障进行了仿真分析，仿真结果表明，改进拓扑有效地抑制了直流侧故障电流，避免了交流断路器动作。 |
| 关键词: ＭＭＣ-ＨＶＤＣ 直流故障 双向阻断 故障分析 高压直流输电 仿真 |
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| 基金项目:国家高技术研究发展计划（863计划）项目（2013-AA050105） |
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| Simulation and analysis of DC-link fault characteristics for MMC-HVDC |
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ZHANG Jianpo, ZHAO Chengyong
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources，North China Electric Power University，Beijing 102206，China
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| Abstract: |
| The DC-link fault characteristics of MMC-HVDC system are different from those of two-level VSC-HVDC system because of different topologies and modulation methods. Based on the simulation model established with PSCAD／EMTDC，the DC-link fault characteristics of line-to-ground，broken line and line-to-line，as well as their effects on system operation，are analyzed. The topology of half-bridge sub-module is improved to block the fault current in both directions，which，by changing the arm current path，charges the arm capacitor in both directions to set the blocking voltage of free-wheel diode. Simulation is carried out for the line-to-line fault and results show that，the improved topology suppresses the DC-link fault current effectively to prevent the trip of AC circuit breaker. |
| Key words: MMC-HVDC DC-link fault bidirectional blocking failure analysis HVDC power transmission computer simulation |
