基于Wigner-Ville时频分析的行波信号检测方法

针对行波信号的准确有效检测,结合专用行波传感器进行故障信号的测量,提出了一种基于Wigner-Ville时频分析的行波检测方法。该方法通过系统建模仿真分析输电线路、阻波器、CVT和专用行波传感器对故障行波信号的传变特性,应用Wigner-Ville分布对所测行波信号线模分量进行时频特征分析,利用交叉项时间聚集特性选取能量主频带,然后求取能量主频带演变谱,实现行波信号检测。仿真结果表明,在不同输电线路故障情况、噪声干扰、最低要求采样频率以及通过专用行波传感器测取信号情况下,该方法对比WT和HHT方法,能更加准确有效检测故障行波信号,并且利用该检测信号所得故障定位结果满足工程精度要求。

The Detection Method forTraveling Wave Based on Wigner-Ville time-frequency analysis

A traveling wave detection method based on Wigner-Ville time-frequency analysis is proposed by analyzing the time-frequency characteristics of measured signals of the special traveling wave sensors. In this method, the transmission characteristics of the fault traveling wave signal are analyzed by the system modeling and Simulation of the transmission line, wave trapper, CVT and the special traveling wave sensor. The Wigner-Ville distribution is used to analyze the time-frequency characteristics of aerial mode component of traveling wave signals, and the major energy frequency band can be selected by the cross term temporal aggregation. Then, the evolutionary spectrum of the major energy frequency band is obtained to detect the traveling wave signal. The simulation results show that this method can detect the traveling wave signal accurately and effectively according to the signals measured by the special traveling wave sensor compared with the two methods of WT and HHT, and the fault location result can meet the requirement of engineering accuracy.