How to calculate total harmonic distortion for a given signal?
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Millo Dacha
il 15 Nov 2020
Risposto: Joel Van Sickel
il 17 Nov 2020
How to calculate total harmonic distortion for a given signal?
I have used 'spectrum analyzer block' in Simulink and it gives me about 13 percent THD, whereas when I use thd() function in MATLAB script I get around 3.3492e-06 percent.
(Signal is output of a LCL filter which has been fed with output of a sine-PWM inverter.)
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Joel Van Sickel
il 17 Nov 2020
Hello Millo,
when you used the function, did you only provide the signal data, or did you provide attitional parameters? It is likely you should specificy additonal parameters to get the THD that you want. Please look at the doc page carefully to see what else you can specify: Also, please take into account, that the spectrum analyzer is doing a lot of extra work behind the scenes. This matlab function does not return the value in percent, but in dbc, so you need to convert to percent.
However, I find that using fft, while a bit more work, is also more intuitive to understand what is going on. There are numerous examples of calculating THD in the file exchange. Here is one of them.
Regards,
Joel
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Rahul Kumar
il 15 Nov 2020
click on powergui block then select FTT analysis after that you find your THD spectra for perticular signal.
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