交流避雷器短时工频干扰信号快速抑制方法

Quick suppression method for short⁃time power frequency interference signal of AC lightning arrester

为了有效去除和抑制交流避雷器短时工频干扰,并解决自适应滤波法和陷波滤波法出现的信噪比提升效果差、运算时间长等问题,提出了交流避雷器短时工频干扰信号快速抑制方法。该方法利用工频干扰的时间结构信息,消除和抑制短时工频干扰信号中的参考干扰和频谱干扰,获得了较为明显的抑制和去除效果,有效降低了短时工频干扰信号对交流避雷器运行的影响。实验结果表明,交流避雷器短时工频干扰信号快速抑制方法优于自适应滤波法和陷波滤波法,信噪比得到了较为明显的提升,运算时间较短。

In order to effectively remove and suppress short⁃term power frequency interference from AC surge arresters,and to solve the problems of poor signal⁃to⁃noise ratio improvement and long operation time caused by adaptive filtering and notch filtering methods,quick suppression method for short⁃term power frequency interference signal of AC lightning arresters is proposed.This method uses the time structure information of the power frequency interference to eliminate and suppress the reference interference and spectrum interference in the short⁃term power frequency interference signal,and obtains a more obvious suppression and removal effect,and the influence of short⁃time power frequency interference signal on the operation of AC lightning arrester is effectively reduced.The experimental results show that the method of rapid suppression of short⁃time power frequency interference signals of AC lightning arresters is better than the adaptive filtering method and the notch filtering method,the signal⁃to⁃noise ratio has been significantly improved,and the calculation time is shorter.