高压直流输电线路行波保护判据的研究

Research on traveling wave protection criterion on HVDC transmission line

目前 ,国内外投运的行波保护普遍存在着可靠性差的问题。针对该问题 ,简要分析了实际工程中行波保护存在的缺陷。同时 ,在使用 EMTDC暂态仿真软件对各种直流线路故障进行仿真计算的基础上 ,对目前国际上具有代表性的两种行波保护判据进行了对比性分析与研究 ;并提出了基于小波变换的行波方向保护新原理 。

To the problem of traveling wave protection's low reliability, this paper briefly analyses defects existing in traveling wave protection of actual projects. And on the basis of fault simulation on HVDC line using EMTDC, the paper studies two representative kinds of traveling wave protection criterion. Furthermore, the paper puts forward a new traveling wave direction protection theory based on wavelet transform with good reliability.