基于S变换信号处理的直流电缆输电线路测距

Distance Measurement of DC Cable Trarsmission Lines Based on S Change Signal Processing

针对高压直流电缆输电线路在发生故障时其故障位置难以及时反馈快速确定相应位置。本文提出一种基于S变换信号处理的直流电缆测距方法。首先考虑到电缆线路的频率能量在线路传播的过程中的衰减特性。利用S变换算法对电信号进行处理,将该信号进行时换,从而计算出特定频带的信号能量。其次考虑到一旦直流电缆发生故障,其信号能量向着线路两端传播的过程中,能量和频率的衰减特性与长度相关,接着,构建相关频带能量与距离的方程,从而便可以计算出故障距离,实现故障的定位。最后通过搭建的直流输电系统模型,验证上述提及方法的有效性。

For high⁃voltage cables,it is difficult to quickly determine the corresponding position when the fault po⁃sition is timely feedback.In this paper,a DC cable ranging method based on S transform signal processing is pro⁃posed.First of all,the attenuation characteristics of the frequency energy of the cable line in the process of line propagation are taken into account.The S⁃transform algorithm is used to process the electrical signal and convert the signal to time⁃frequency to calculate the signal energy of a specific frequency band.Secondly,considering that once the DC cable fails,the attenuation characteristics of the energy and frequency are related to the length in the process of propagating the signal energy to both ends of the line,and then the equation of the energy and distance of the rel⁃evant frequency band is constructed,so that the fault distance can be calculated and the fault location can be real⁃ized.Finally,the effectiveness of the above⁃mentioned methods is verified by constructing a model of the HVDC transmission system.