Compute total harmonic distortion (THD) of signal
Simscape / Electrical / Specialized Power Systems / Sensors and Measurements
The THD block computes the total harmonic distortion (THD) of a periodic distorted signal. The signal can be a measured voltage or current.
The THD is defined as the root mean square (RMS) value of the total harmonics of the signal, divided by the RMS value of its fundamental signal. For example, for currents, the THD is defined as
The THD has a null value for a pure sinusoidal voltage or current.
- Fundamental frequency of input signal (Hz)
Specify the frequency, in hertz, of the fundamental signal. Default is
- Sample time
Specify the sample time of the block, in seconds. Set to
0to implement a continuous block. Default is
|Sample Time||Specified in the Sample Time parameter|
Continuous if Sample Time = 0
|Scalar Expansion||Yes, of the parameters|
uses a THD block to compute the THD of a 60 Hz signal with second
harmonic and a DC bias.
The model sample time is parameterized by the Ts variable set to a default value of 50e-6 s. Set Ts to 0 in the command window to simulate the model in continuous mode.