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为了确定特高压直流输电工程中直流滤波器各设备的暂态定值,需要对直流滤波器的故障工况进行研究。根据工程经验,在暂态定值研究中需要考虑的故障工况包括直流滤波器高压端(或直流极线)对地短路和直流极线上侵入操作波。通过在仿真程序中建立直流滤波器的故障模型,并充分考虑不同的对地故障距离对直流滤波器各设备的影响,从中选出各设备最苛刻的应力。文中通过对三调谐滤波器的故障仿真对该方法做了进一步说明。仿真结果显示,该研究方法对确定直流滤波器暂态定值具有决定性作用。
In order to determine the transient setting of DC filter in UHVDC project, it is necessary to study the fault condition of DC filter. According to the engineering experience, the fault conditions to be considered in the transient stability study include the short circuit to the ground at the high voltage terminal (or DC polar line) of the DC filter and the intruding operation wave on the DC polar line. Through establishing the fault model of the DC filter in the simulation program and taking fully into account the influence of different ground fault distances on each device of the DC filter, the most demanding stress of each device is selected. In this paper, the method is further explained by the fault simulation of three tuned filters. Simulation results show that the proposed method is decisive for determining the transient state of DC filter.