基于FFT功率谱和SVD的局放窄带干扰降噪方法研究

Study on Noise Reduction Method of Partial Discharge Narrowband Interference based on FFT Power Spectrum and SVD

针对电缆终端局部放电检测存在周期性窄带干扰问题,提出了一种基于FFT功率谱和奇异值分解的局放信号周期性窄带干扰降噪方法。通过对仿真、试验局放信号进行去噪,并与FFT阈值去噪和小波去噪等方法对比分析,表明该方法对于周期性窄带干扰具有更优的抑制效果,能较好地还原PD信号。

With regard to the problem of periodic narrowband interference in cable terminal partial discharge inspection,a periodic narrowband interference noise reduction method of partial discharge signal based on FFT power spectrum and singular value decomposition is proposed.Through denoising of simulation and test partial discharge signals,and compared with FFT threshold denoising and wavelet denoising,it shows that this method has better suppression effect for periodic narrowband interference and is able to restore PD signals properly.