Research of Damping System Characteristics for HVDC Converter Valves

直流换流阀阻尼系统由饱和电抗器铁心电阻和晶闸管级阻尼电阻2部分组成。该文提出了饱和电抗器动态电感和铁心电阻分析计算方法,建立了铁心电阻与磁通密度的函数关系及饱和电抗器等值电路模型。通过对高频电压源激励下端口伏安特性理论计算结果与试验测试结果对比,验证了模型的正确性。提出了阻尼系统抑制振荡电流性能分析方法,给出了晶闸管第1个电流波谷值处于局部极限值的阻尼系统配置方案;分析了阻尼系统冲击电压下辅助限制过电压性能;提出了阻尼系统损耗计算方法,研究了换流阀不同运行状态下的损耗性能。

The damping system of a direct current converter valve, which consists of a saturable reactor, a magnetic core resistor and a thyristor level damping resistor, plays an important part in protecting thyristors and enhancing the performance of converter valves. But at present, the studies on damping characteristic of saturable reactors and analysis of suppression oscillation current performance and impact to the voltage distribution of damping systems are very little.