Fast Fouriet Transformation and Total Harmonic Distortion

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Jacopo Riccio
Jacopo Riccio 2018-7-4
I would like to ask for help regarding the fast Fouriet Transformation and the Total Harmonic Distortion of a signal I have saved in the Matlab workspace from a simulink running. I have a current signal "Ira" and the corresponding "time" array. I have extracted a single period data from the vectors and I used the command :
"THD_db = thd(Ira);"
Of course it gave me a meaningless result.
I have tried to analyze the spectrum of the signal by using the following commands: "Ira_fft = abs(fft(Ira_fft));"
There is something I did not understand about how to use this function for the purpuose I want to achieve.
Could anyone tell me how to use them properly?
Ps. I could not use PowerGui for the signal analysis because I have the basic version of Matlab which does not include PowerGui block.
Thanks in advance

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