摘要:高压直流输电工程是以直流输电的方式来实现电能的传输, 在输送过程中是应用了换流技术将交流电转换为直流电输送到末端在通过逆变器将直流电转换为交流电。本次设计选用的直流输电系统结构为双极直流输电系统，其组成部分主要有，环流变压器、整流站、逆变站和直流输电线路等组成，其中整流站和逆变站合称为换流站。本设计的重点侧重于±500KV高压直流输电工程线路中换流变压器、换流站设计及其换流站的保护设计。高压直流输电换流站主要包括换流变压器、换流阀、平波电抗器、交直流开关设备、控制保护系统等。在设计中选择换流变压器、晶闸管、避雷器等各种元器件主要以经济、安全、可靠与适用为主要原则。最后通过计算，选择换流站的主接线方式、换流变压器的容量、额定电压及其型号、换流站中晶闸管的数目、线路的合理合理布置及其其他主要设备的容量与型号，以便最后完成±500KV高压直流输电工程线路设计。

关键词： 高压直流输电；换流站；两端；双极；交直流滤波

ABSTRACT:HVDC transmission engineering is the way to realize dc transmission power transmission, in the course of transmission for is the application of flow changing technology will convert alternating current to direct current transport in the end by inverter will direct current conversion for alternating current. The design of chosen HVDC system structure for bipolar HVDC system, which consist of a, circulation, rectifier transformer station, inverter stand and dc transmission lines and other components, including rectifier stand and inverter stand known collectively as converter stations. The design of the key focus on + 500 KV HVDC transmission engineering circuit of converter transformer is converter, design and its converter protection design. HVDC transmission converter stations mainly includes the commutation transformer, the commutation valve, flat wave reactor, ac/dc switch equipment, control and protection system, etc. In the design, the choice of flow changing transformer, thyristor, lightning arrester and all kinds of main components in economic, safe, reliable and applicable for the main principles. Finally through calculation, the choice of the main connection mode converter, changing flow capacity of the rated voltage transformer, and its model, the number of ceramics converter brake canal, the reasonable arrangement and reasonable line other major equipment capacity and model, so that the finished + 500 KV HVDC transmission line design project.

Keywords:  HVDC transmission; convertor station; ends; bipolar; Ac&dc filter