±500kV高压直流输电线路单端电气量暂态保护

Based electrical transient protection for ± 500 kV HVDC transmission line

随着直流输电的广泛应用,直流输电线路保护的研究越来越重要。利用直流输电线路两端的平波电抗器与直流滤波器组成的边界元件对高频信号的阻滞作用以及故障电流突变特性构成了高压直流输电线路单端电气量暂态保护新方法。该方法采用单端信息、不依靠通信,动作更迅速。仿真结果表明,保护在各种情况下均能正确动作,耐过渡电阻能力强。

With the wide application of HVDC, HVDC transmission line protection is becoming more and more important. In this paper, a DC transmission line based electric transient protection method is proposed by using the impedence effect of the boundary components consisting of the smoothing reactor and DC filter on the highfrequency signals and mutation characteristics of the fault current. This method uses the based information, does not depend on the com- munication and would action more quickly. The simulation results show that protection can operate correctly in all situations, and have the ability of great resistance to transition resistance.