UHVDC高端换流变取消分接头对运行工况影响的仿真研究

Simulation Analysis on the Influence of the High-end Converter Transformer Without Tap-changer in the UHVDC on Its Operation Condition

为研究高端换流变取消分接头对直流系统运行工况的影响,根据实际输电工程的换流器控制系统包括阀组触发角控制和换流变分接头控制建立仿真模型,通过对系统的全电压运行与降压运行的仿真,对各个工况下高端换流变取消分接头引起的高低端换流器运行和控制的不对称性进行分析评估,这对研究换流变取消分接头的可行性及其主回路参数的设计有重要的现实意义。

To study the effect of high converter transformer with no tap-changer on operating conditions of DC system,a simulation model is established according to the converter control system of real transmission project that includes valve group firing angle control and converter transformer tap-changer control.By means of simulating the full voltage operation and decompression operation of the system,the asymmetry caused by the operation and control of high-end and low-end converter transformers is analyzed and evaluated,which has important realistic meaning for studying the feasibility of converter transformer without tap-changer and the parameters designing of its main circuit.