How to use Windowed FFT for Harmonics Analysis

[kanokwat]

Hi everybody
I do my project about harmonics analysis
I use FFT compare with Windowed FFT
Now I can write code FFT
example x(t)=5sin(2*pi*50*t)+3sin(2*pi*100*t)
and use FFT to find Amplitude at frequency 50Hz and 100 Hz

For winndowed FFT use Hanning windowed how to use it ??
What should begin?

Use paper The Algorithm of Interpolating Windowed FFT for Harmonics Analysis of Electric Power System IEEE VOL16 NO 2 APRIL 2001

Thx

 

[ashwini1]

x=5sin(2*pi*50*t)+3sin(2*pi*100*t)
W=hann(length(x));
Data=x.*W;

figure;
f=(sampling_freq)*linspace(0,1,NFFT);
plot(f,abs(fft(Data,NFFT)));
grid on;

Is this what you are looking for??
HTH,
-- Ashwini

 

[kanokwat]

thx