大连跨海柔性直流输电重大科技示范工程是目前世界上电压等级最高、输送容量最大的柔性直流工程。提出了大连柔性直流换流站的主接线方案、基本控制策略、主回路及主设备技术参数、绝缘配合方案和设备绝缘水平，形成了柔性直流的整体技术方案，对同类工程的系统设计提出了完整的设计方法和思路，对于推动我国柔性直流技术的进步和工程应用具有重要意义。

By now Dalian VSC-HVDC Crossing-Sea Project has the highest voltage level and the largest power transmitting capacity in the world. In the design of VSC-HVDC power system, the main circuits scheme, control strategy, the technical parameters of main circuits and main equipment, insulation coordination scheme and equipment insulation level are proposed for its converter station. Thus the overall VSC-HVDC technical scheme has been formed, which could provide completed design method and ideas for the system design of similar projects, and has special significance for the progress and engineering application of VSC-HVDC technology in China. Moreover, the system design of VSC-HVDC power transmission project has attached significant importance for the development of VSC-HVDC technology, the research of VSC-HVDC equipment and the engineering construction in China.