Harmonic Detection Based on Sliding-windows Iterative of Discrete Fourier Transform and Wavelet Transform

摘要

Aiming at the disadvantages of the present electric parameters detection of power harmonics, a power system harmonic detection technique based on sliding-windows iterative of discrete Fourier transform (SWIDFT) and wavelet transform (WT) are proposed in this paper. Using SWIDFT to detect the fundament components and the total harmonic components and using WT to extract and separate the fundamental harmonic and the high order harmonic contents from the total harmonic components. Simulation results obtained by this algorithm reveal that the proposed method can detect harmonic signal precisely. Therefore, it provides an effective means for power system harmonic analysis and detection.