Application in Harmonic Signal Detection Based on STFT and S Transform

摘要

For harmonic signal that often occurs in the power system, this paper proposes an algorithm based on S transform matrix and introduces S transform, and MATLAB simulation. This research uses 5% hanning window function to remove the edge, cubic polynomial to fit the original signal and mean value of S transform matrix's row vector to improve the calculated accuracy and gets the parameters of the harmonic signal. The simulation results show that the improved S transform has overcome the disadvantage of Short Time Fourier Transform and more effectively reduced the spectrum leakage. This provides an effective method in detecting the harmonic disturbance.