Total Harmonic Distortion
Output the total harmonic distortion (THD)
Modelica Standard Library
The Total Harmonic Distortion component determines the total harmonic distortion (THD) over the given period 1f.
Consider that the input u consists of harmonic RMS components U1, U2>, U3, etc. The total RMS component is then determined by:
The calculation of the total harmonic distortion is based on the parameter useFirstHarmonic. The default value useFirstHarmonic=true represents the standard THD calculation used in electrical engineering http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=551-20-13 . The non-default value useFirstHarmonic=false calculates the THD typically used for the assessment of audio signals. If useFirstHarmonic=true, the total higher harmonic content (harmonic order numbers > 1) refers to the RMS value of the fundamental wave:
If useFirstHarmonic=false, the total higher harmonic content (harmonic order numbers > 1) refers to the total RMS:
In case of a zero input signal or within the first period of calculation, the boolean output signal valid becomes false to indicate that the calculation result is not valid. Valid calculations are indicated by valid=true.
Real input signal
Real output signal
Boolean output signal; true, if output y is valid
use first harmonic
THD with respect to first harmonic, if true; otherwise with respect to total RMS
The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.
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