固态限流器对电力系统瞬间电压跌落的影响

电网结构日趋复杂，系统短路容量急剧增加，研究故障情况下提高电压稳定性对于系统安全运行具有重要意义，固态限流器在系统正常运行条件下对外不呈现阻抗，当系统发生短路故障时迅速串入系统网络中。对母线电压具有强支撑作用，利用耦合式三相固态限流器，对2种典型电网系统模型发生故障情况进行了仿真分析。研究表明：固态故障限流器的应用能够有教抑制短路故障引发的系统瞬间电压跌落，而且随着限流阻抗值的增大，相应的改善效果更为明显。这也显示改善系统故障电压是故障限流器具有的一种本质能力。

Influence of solid-state current limiter upon the voltage sag in electric power system

With the electric power network more complex and the short-circuit capacity significantly increasing,it is getting more and more important to enhance the voltage stability to ensure the safe operation for the entire electric power system.In the case of a short-circuit fault,it is to automatically insert into the system with high impedance to remain the bus voltage.The voltage sag characteristics of two kinds electric grid system with solid-state current limiter were simulated here.The achieved results indicate that the voltage sag may be effectively restrained using solid-state current limiter with coupled transformer and shunt reactance.And then the effectiveness can be improved significantly with high value of shunt reactance.This is of very importance for enhancing the voltage quality.