Harmonic detection algorithm based on dual window full phase FFT dual spectral line in construction site power grid

In recent years, with the increase of nonlinear equipment in construction sites, harmonic pollution in the power grid has become increasingly serious, which has had a significant impact on terminal equipment, communication networks, and other aspects of construction sites. Accurately detecting harmonics has practical significance. Aiming at the problem of poor performance of traditional detection methods, a dual window all phase FFT dual spectral line detection method is proposed. A complex signal model with harmonics and interharmonics was constructed using Matlab, and various methods were used to detect the signal, verifying the accuracy of the proposed Blackman window double window all phase FFT double spectral line correction detection algorithm in this paper. To test the antiinterference characteristics of this method, different intensities of white noise were added to the signal, and the relative errors of the detected fundamental amplitude and frequency were calculated to verify the anti-interference characteristics of this method.