While attempting to preform harmonic analysis on my 3-phase inverter circuit, there is a significant component at 0Hz in the frequency spectrum. The fundamental frequency of the inverter is 23.4kHz which has an amplitude significantly less than that of the 0Hz component. In particular, I am interested in the 3rd harmonic component and am not sure how PSIM preforms the FFT analysis.
Is the 0Hz component the 1st harmonic in the PSIM analysis (making 46.8kHz the 3rd harmonic), or does the fundamental frequency remain at 23.4kHz (making 70.2kHz the 3rd harmonic as I expected to see)?
Any assistance on this matter would be most appreciated.
Thank you kindly,