基于VMD-Hilbert变换的故障行波定位研究

针对现有行波检测方法中小波变换和希尔伯特黄变换的不足,提出一种基于VMD-Hilbert变换的故障行波检测方法。通过对行波传感器采集到的故障行波信号进行VMD分解,利用Hilbert变换提取模态分量的特征量来标定初始波头的到达时间。针对行波定位精度受波速不确定性影响的问题,基于故障初始行波零模分量和线模分量波头的到达时刻,提出一种与波速无关的双端定位算法。ATP/EMTP仿真结果表明,VMD-Hilbert行波检测方法能有效标定行波波头时间,定位算法无需知道故障发生时刻和故障反射行波波头的到达时刻,进一步提高了故障定位的精度。

Research on fault traveling wave location based on VMD-Hilbert transform

To solve the shortcomings of wavelet transform and Hilbert Huang Transform (HHT) in fault traveling wave detection methods, a novel fault traveling wave detection based on Variational Mode Decomposition and Hilbert (VMD-Hilbert) transform is proposed. The fault signal collected by travelling sensor is decomposed by VMD and the initial traveling wave arriving time is determined by eigenvalues of modal component extracted by Hilbert transform. To eliminate the uncertainty of fault traveling wave velocity affects the location accuracy, a novel fault location method is proposed based on arriving time of fault initial traveling wave zero mode component and line mode component, which is not affected by traveling wave velocity. Results of ATP/EMTP simulation show that the detection method proposed can effectively determine the traveling wave time and the fault location method dispenses with the time of fault occurrence and arriving time of fault reflecting wave, which improves the location accuracy further. This work is supported by National Natural Science Foundation of China (No. 51425701 and No. 61233008), National Key Research and Development Program of China (No. 2016YFB0900605 and No. 2017YFB0902903), and Hunan Provincial Key Research and Development Program (No. 2016GK2013).