±800kV/6250A特高压直流换流阀的研制  

Research and Development of ±800kV/6250A UHVDC Converter Valve

作　　者：欧阳文敏 肖万芳[2] 王治翔 张静 纪锋 周建辉 

机构地区：[1]全球能源互联网研究院,北京市昌平区102209 [2]国网北京市电力公司,北京市昌平区102200 [3]先进输电技术国家重点实验室(全球能源互联网研究院),北京市昌平区102209 [4]大功率电力电子北京市重点实验室(全球能源互联网研究院),北京市昌平区102200

出　　处：《电网技术》2017年第10期3196-3200,共5页Power System Technology

基　　金：国家电网公司科技项目(SGRIPGJS[2014]89)~~

摘　　要：随着我国东部地区用电负荷进一步增大,迫切需要开发10000MW以上特高压直流输电技术。针对直流工程核心装备,系统地介绍了6250A/±800k V特高压直流换流阀的研究工作。通过结构参数、电子辐照能量等参量的调整,开发了具有超大通流能力的晶闸管,提出了晶闸管电气特性优化方法。分析了晶闸管关断过冲电压及关断损耗的影响因素,确定了阻尼电阻、阻尼电容值,关断过冲安全情况下使晶闸管关断损耗最优化。建立了饱和电抗器等效电路模型,对优质低损耗铁心的热特性开展了仿真分析,分析结果表明电流大幅提升并未明显提高饱和电抗器铁心损耗及热点温升。建立了流体-固体耦合模型,开展了电接头热特性分析,通过巧妙设计含水路的母排,在有限空间内解决了大电流下电接头发热的问题。最后对研制的6250A/±800k V特高压直流换流阀开展了型式试验,试验结果表明换流阀各项指标优良,完全满足工程应用要求。As power consumption increasing in area of Eastern China, it is urgent and necessary to study and develop UHVDC transmission technology above 10000 MW. This paper systematically presents research of 6250 A UHVDC converter valve, the heart of UHVDC project. By adjusting structure and electron irradiation energy, huge current capacity thyristor is developed and optimization method of thyristor is initially presented. Factors affecting shutoff overshoot voltage and energy loss are analyzed and optimized values of damping capacity and resistance are ascertained, resulting in less thyristor shutoff loss when shutoff overshoot voltage is under safe value. Equivalent circuit model of saturated reactor is built up, and thermal characteristics of low-loss iron core is simulated. Results show that loss and hot spot temperature of saturated reactor are not obviously increased when current rises. Then, by building up fluid-solid coupling model, thermal characteristics of electrical connecter are analyzed, and heat radiation problem in electrical connecter in limited space is solved by brilliantly designing circuit bus with water route. Finally, type test on the developed ±800k V/6250 A converter valve is carried out and results indicate that all indexes are premium and completely meet project requirement.

关 键 词：特高压直流换流阀 6250A 晶闸管 阻尼回路 饱和电抗器 电接头 型式试验 

分 类 号：TM86[电气工程—高电压与绝缘技术]