基于模块化风冷换流阀的中压直流输电系统

Medium Voltage Direct Current Transmission System Based on Modular Air Cooling Converter Valve

为探索中国国内中压直流输电(MVDC)市场的未来,文中通过已经建成的德国亚琛大学的10 kV直流配电工程案例,重点介绍了中国西电集团完全自主化制造、具有全部自主知识产权的一个中压直流输电系统。该系统采用了完全自主化设计的模块化风冷光触发晶闸管(LTT)换流阀、箔绕干式换流变压器及完全数字化接口的控制保护系统。整个系统紧凑简洁、可靠性高、便于维护,已经具备了进行示范工程应用的条件。此外,还对中压直流输电的技术经济性进行了初步分析,结果说明针对交流配网增容受限的城市负荷中心、远距离电缆输电区域、具有分布电源或大容量直流负载的负荷区域以及中压直流输电都具有相当的竞争力。

To explore the future of domestic medium voltage DC transmission（MVDC）market,this article through the 10 kV DC pilot project of Aachen University campus in Germany. A medium voltage DC transmission system which is independently manufactured by China XD with all the intellectual property rights is introduced. The system adopted the completely independent design of the modular air cooling light triggered thyristor（LTT）,foil winding dry-type converter transformer and control protection system of fully digital interface. The system is compact,high reliability,easy maintenance and has the conditions of demonstration project application. This paper also makes the technical and economic analysis about the medium voltage DC transmission,the results show that medium voltage DC transmission（MVDC）is highly competitive in the distribution demand for the AC distribution capacity limited urban load center,remote cable delivery area,load region with distributed generator or large DC capacity.