特高压直流换流站二次设备回路传导电压干扰特性研究

准确分析特高压直流换流站二次设备回路电磁干扰特性是制定相关防护措施的前提和依据。文中以某±800 kV特高压直流输电工程为对象,分别建立了换流阀、换流变、平波电抗器等一次回路元件的宽频等效模型,进而得出了一次回路传导电压干扰特性,再采用二次电缆和电容式电压互感器宽频等效模型,对各类工况下二次设备回路的传导电压干扰特性进行了分析,并分析了电缆长度、负载率等因素的影响。

Research on the conducted voltage interference in the secondary circuit of an UHVDC converter station

Accurate analysis of the electromagnetic interference characteristics in the secondary equipment circuit in an UHVDC converter station is the premise and basis for formulating the protection measures. The broadband equivalent models of the main elements of a ±800kV UHVDC converter station, such as the converter valve, converter transformer and smoothing reactor are built in this paper, and the conducted voltage characteristics of the primary circuit are obtained accordingly. Combined with the broadband equivalent model of Capacitor Voltage Transformer and secondary circuit cables, the conducted voltage characteristics in the secondary equipment circuit under different operation modes are researched, the influence of the cable length and burden rate are studied.