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Fast Fourier transform(FFT) is an important tool for harmonic analysis in power systems and a method of FFT analysis of the signal is very important for power systems. For finding and forming a basic way to FFT analysis of feeder current, the paper embarks from the principle of Fourier transform and analyzes the principle and algorithm of the related metrics such as spectrum and signal-to-noise ratio(SNR). Then it uses the smooth function which is based on the moving average filter to filter the feeder current, which is used to prove the feasibility of this method. Meanwhile its result which we can get the data from figures and tables in the paper also shows that the smooth function as a low-pass filter can effectively filter out noise and keep the feeder current fundamental wave using the way that changes span values and method, but it will cause the base wave distortion. Keywords-MATLAB;FFT analysis;spectrum;SNR;feeder current

The Application of FFT Analysis on the Feeder Current Based on the Smooth Function in MATLAB