基于HHT能量谱的行波保护方法

HHT energy spectrum based traveling wave protection

为了克服行波信号分析中的基函数选择问题,利用Hilbert-Huang(HHT)变换得到HHT能量谱,利用阻波器两端能量谱的差别来区分内、外部故障。区外故障时,线路两端检测到的初始行波波头经过阻波器的数目不同,两端的HHT能量谱相差很大;区内故障时,线路两端检测到的初始行波波头都只经过1个阻波器,两端行波波头的能量谱相差很小,利用此差异来构造行波保护.仿真结果表明,该方法能可靠动作,是一种简单有效的行波保护方法.

In order to overcome the problem of basis function choosing in signal processing,Hilbert-Huang is used to get the HHT energy spectrum.The energy spectrums of initial traveling wave crest on both sides of transmission line are used to distinguish internal fault and external fault in this paper.There are large difference between the HHT energy spectrums detected on both sides of transmission line when fault occurs in external area,because the number of line traps from the both sides to the fault point is different.And the energy spectrums are similar when fault occurs in internal area,because there is one line trap from the both sides to the fault point.According to the difference,traveling wave protection is formed.Simulation results show that the method is with high reliability,and it is an easy but effective protection method.