This information is part of the Modelica Standard Library maintained by the Modelica Association.
This block determines the total harmonic distortion (THD) over the given period
Consider that the input
u consists of harmonic RMS components
The total RMS component is then determined by:
The calculation of the total harmonic distortion is based on the parameter
The default value
useFirstHarmonic = true represents the standard THD calculation used in
The non-default value
useFirstHarmonic = false
calculates the THD typically used for the assessment of audio signals.
useFirstHarmonic = true, the total higher harmonic content (harmonic order numbers > 1)
refers to the RMS value of the fundamental wave:
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
false to indicate that the calculation result is not valid. Valid
calculations are indicated by
valid = true.
Type: Frequency (Hz)
Description: Base frequency
Description: THD with respect to first harmonic, if true; otherwise with respect to total RMS
Calculation of total harmonic distortion of voltage