为满足川西水电外送，“十二五”期间国家电网公司将规划建设三直二交的交直流特高压电网。分析了西电东送交直流输电线路的送电能力以及交直流输电系统间的相互影响，重点分析了利用特高压直流输电系统间的不同特点，提高四川电网的稳定水平和川电东输送电能力。

In order to transfer large capacity hydropower from west of Sichuan province to outside, State Power Grid Corporation plans to establish three-DC and two-AC UHV transmission line. The transmission capability from the west to the east and the interaction between AC and DC transmission system are analyzed, focusing on the study of how to using the advantages of UHVDC transmission system and the grid characteristics to improve the grid reliability of Sichuan province.