直流互感器的传变特性研究

Study of transmission characteristics for DC transformer

直流线路上的电能质量事件对系统继电保护和检测计量有着不利影响,研究在不同电能质量条件下的直流互感器的传变特性对系统安全运行具有重要意义。通过对湖北境内多座直流换流站进行连续采集,获取了典型的直流线路上的电能质量事件信号,将信号输入到直流互感器的传递函数模型中,以此验证直流互感器在极端条件下的传变特性。结果表明,直流互感器能很好地跟踪一次侧复杂信号,但在检测尖端峰值时误差较大。

Power quality events has an adverse effect on rely protection and metering, so it’s significant to studying the transform appearance of DC transformer in the moment when power quality events happened. By continuous sampling from converter station in Hubei province, several typical power quality signals has been obtained. In order to verify the transfer characteristics in extreme condition, the signals was entered to the transfer function model of DC transformer. The result shows that the transfer function model can follow the primary signal perfectly, but the error increases when detecting peak section.