Question

otal Harmonic Distortion Ham THD =-ar. 尔. ん 35

Considering the cuts in the sin signal.

Plz help me to make a matlap code to find the

(Total Harmonic Distortion )

I have named “alpha” between them so i can cod any similar signal.

the matlap cod should plot the distortion found.

and calculate it Plz ❤️.

Answer 1

Below is the matlab code to compute the total harmonic distortion in a given signal. The below example uses a consine signal at 10 Hz fundamental freq and adds up two thermal harmonic distortions at 20 and 30 Hz with ampl. = 0.5.

Pl. replace your signal to get the THD of your signal.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

close all,
clear all,
clc,

Fs = 1000;
FundamentalFreq = 10;
Amp = 1;

t=0:(1/Fs):1;

%Pure Cosine Signal at Fundamental Freq = 10 Hz.
Signal = Amp*cos(2*pi*FundamentalFreq*t);
subplot(2,1,1); plot(Signal); title('Original Cosine Signal at Fundamental Freq = 10 Hz');

%Add Harmonics at 20 and 30 Hz with Amp = 0.5;
Signal = Amp*cos(2*pi*FundamentalFreq*t)+0.5*cos(2*pi*20*t)+0.5*cos(2*pi*30*t);
subplot(2,1,2); plot(Signal); title('Original Signal with THD at 20 Hz and 30 Hz');

r = THD(Signal)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Original Cosine Signal at Fundamental Freq 10 Hz 0.5 800 1200 200 400 600 1000 Original Signal with THD at 20 Hz and 30 Hz 1.5 0.5 1000 200 400 600 800 1200