| 引用本文: | 韦延方,卫志农,孙国强,郑玉平,俞 波.基于局部电压稳定指标的裕度灵敏度分析及应用[J].电力自动化设备,2012,32(7): |
| WEI?Yanfang,WEI?Zhinong,SUN?Guoqiang,ZHENG?Yuping,YU?Bo.New?HVDC?power?transmission?technology：MMC-HVDC[J].Electric Power Automation Equipment,2012,32(7): |
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| 摘要: |
| 介绍了模块化多电平换流器型高压直流输电（MMC-HVDC）的基本结构、工作原理和技术特点，比较了MMC-HVDC相对于电压源换流器型高压直流输电（VSC-HVDC）的优势；对MMC-HVDC目前在国内外的研究进展和工程应用情况进行了回顾，分析了MMC-HVDC技术的不足之处和未来发展中可能的重点方向，包括主电路拓扑的相关问题研究、系统设计、故障保护、接地、谐波和损耗等，指出目前研究所采用的MMC-HVDC分析模型精度较低；因自身拓扑限制，目前成熟的VSC-HVDC控制方法无法直接用于MMC-HVDC；MMC-HVDC拥有较强的故障保护能力，当前研究着重于故障仿真分析，亟待探讨适合工程应用的保护策略；由于直流侧无需安装高压电容器组，MMC-HVDC接地实现困难；由于MMC-HVDC子模块数较多，采用较低的开关频率可得到较好的输出电压波形，使得系统损耗大幅降低；最后探讨了适合我国国情的MMC-HVDC工程实践。 |
| 关键词: 模块化多电平换流器 电压源换流器 高压直流输电 换流器 |
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| 基金项目:国家自然科学基金资助项目（50877024，51107032， 61104045）；中央高校基本科研业务费（2010B05914）；河海大学自然科学基金资助项目（2009421411） |
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| New?HVDC?power?transmission?technology：MMC-HVDC |
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WEI?Yanfang1, WEI?Zhinong1, SUN?Guoqiang1, ZHENG?Yuping2, YU?Bo3
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1.Research Center for Renewable Energy Generation Engineering，Ministry of Education，Hohai University，Nanjing 210098,China;2.State Grid Electric Power Research Institute，Nanjing 210003，China;3.State Grid Electric Power Research Institute，Nanjing 210004，China
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| Abstract: |
| The structure，operational principle and technical features of MMC-HVDC are described and the differences between MMC-HVDC and VSC-HVDC are compared. A brief survey is made on the present research statuses and engineering applications of MMC-HVDC. The drawbackes and some possible important trends of MMC-HVDC are analyzed，including：MMC-topology-related research，system design，fault protection，grounding，harmonics，loss，and so on. It is pointed out that the MMC-HVDC model for current research has low precision. For the limit of MMC topology，the mature control methods of VSC-HVDC can not be directly applied to MMC-HVDC. MMC-HVDC system has a strong ability of fault protection. Since current research emphasizes on the simulative analysis of fault protection，further research of MMC-HVDC protection strategy suitable for engineering applications is urgently needed. The implementation of grounding is difficult for high voltage capacitor banks are removed. For the large number of MMC sub-module，the better output voltage waveform is obtained when low switching frequency is used，and the system loss is low. The engineering practice of MMC-HVDC fit for China is discussed. |
| Key words: modular multilevel converter voltage source converter HVDC power transmission electric converters |
