溪洛渡送电广东同塔双回直流输电工程控制保护策略研究

Study of control and protection strategies for Xiluodu-Guangdong double HVDC systems erected on the same tower

溪洛渡右岸送电广东直流输电工程采用同塔双回输电方式,双回±500kV直流系统在整流站和逆变站共用交流场和接地极系统。针对溪右直流输电工程的特点,在PSCAD/EMTDC仿真平台上利用自定义功能块搭建了双回直流系统较完善的控制保护仿真模型,对双回直流系统的极控制策略、同步协调控制策略、无功功率控制策略及直流线路保护策略进行了比较深入的研究。所提出的控制保护策略可对双回直流系统进行有效的运行控制和保护,研究成果对实际工程的实施具有重要意义。

Xiluodu right bank-Guangdong HVDC transmission project adopts the double-circuit transmission line on the same tower,and the double-circuit ±500kV DC systems share the same AC field and ground electrode at the rectifier and inverter station.According to the characteristic of double-circuit transmission line on the same tower,this paper builts a control and protection simulation model with PSCAD/EMTDC and user-defined function models.The strategies for pole control,synchronization coordination control,reactive power control and DC line protection are studied deeply.Using the control and protection strategy,the double HVDC systems can be effectively controlled and protected.It has important significance for the implementation of actual project.