The New Method on Detection Singularity of Harmonics in Power System

This paper introduces a new method which can detect singularity of harmonics in power system, and combining the wavelet transform with Fourier transform to give full play their advantages, commonly detect and analyse the harmonic in power system . Firstly, using the wavelet transform to analyze the high frequency components of the signals, and determine the signal catastrophe point and occurring time and amplitude of high frequency harmonic oscillation, then analyze the low frequency component by FFT , and require the harmonics parameters. This paper gives the harmonic detection scheme which combines wavelet transform and FFT, and simulation and analysis the harmonic wave with the singular point in power system. The simulation result is satisfied and it is validated that the proposed method has the good analytical capability of unstable signals.