特高压直流输电换流站SVC与滤波器投切协调控制仿真分析

Research on simulation of coordinated control between UHVDC converter station SVC and its reactive power compensation devices

在弱交流系统中,换流站滤波器投切将引起较大的电压变化,影响直流系统的正常运行。基于云广特高压输电系统,采用PSCAD/EMTDC软件,搭建了特高压直流输电系统模型及站内静止无功补偿器模型,仿真分析了换流站在弱交流系统中,滤波器组投切对换流母线电压的影响,同时对静止无功补偿器的定电压控制方式和协调控制方式进行仿真对比。仿真结果表明,SVC与换流站滤波器投切协调控制策略,能够减小滤波器小组投切时引起的电压波动,改善系统运行特性,为实际运行提供了参考。

In a weak AC system, serious voltage fluctuation will be caused by switching AC filters or capacitor banks, threatening system stability. In this paper, a simulation model of Yun-Guang ±800 kV UHVDC and Chuxiong SVC is built by PSCAD/EMTDC, then simulation analysis of voltage fluctuation caused by switching AC filters or capacitor banks at Chuxiong converter station is carried out. Comparison of SVC in voltage control mode and coordinated control mode indicate that the coordinated control can restrain the voltage fluctuation and improve the operation performances, and is helpful to actual operation.