PS Harmonic Estimator (Amplitude, Phase)
Measure harmonic amplitude and phase of periodic signal
Simscape / Foundation Library / Physical Signals / Periodic Operators
The PS Harmonic Estimator (Amplitude, Phase) block measures amplitude and phase of a single frequency component (harmonic) of a periodic signal.
A signal is periodic if it completes a pattern within a measurable time frame, called a period, and repeats that pattern over identical subsequent periods. The signal base frequency is the number of periods per second.
The block accepts a physical signal with one or more harmonics present. It outputs the phase and amplitude for the selected harmonic. Untyped physical ports facilitate unit propagation. The output signal for the amplitude has the same physical unit as the input signal. The output signal for phase has the unit of radians, or 1. For more information, see Angular Units.
To obtain meaningful results, run the simulation for at least one full time period of the signal.
I — Periodic signal, untyped
Input physical signal. The signal must be periodic.
The port name is not visible in the block icon, but you can see this name in the underlying source file (accessible by clicking the Source code link in the block dialog box).
A — Amplitude of the harmonic signal, untyped
Output physical signal corresponding to the harmonic amplitude.
Phi — Phase of the harmonic signal, rad
Output physical signal corresponding to the harmonic phase. Although the physical
output port is untyped, the signal unit is determined by the block equations. When
connecting a PS-Simulink Converter block to this port,
set its Output signal unit parameter to
to another value commensurate with angular units. For more information, see Angular Units.
Base frequency — Periodic signal frequency
60 Hz (default)
Base frequency of the periodic signal.
Harmonic number — Number of harmonic
The number of harmonic within the periodic signal. The value must be a positive integer.
Minimum amplitude for phase detection — Minimum signal amplitude for measuring phase
0.001 1 (default)
The minimum amplitude necessary for measuring the harmonic phase. The parameter unit must be commensurate with the unit of the input signal. If the harmonic amplitude is less than this value, the output at port Phi is 0.
Behavior changed in R2019a
Prior to R2019a, this block did not propagate physical units.
If your model contains legacy blocks without unit propagation, use the Upgrade Advisor to upgrade your blocks to the latest version. For more information, see Upgrading Models with Legacy Physical Signal Blocks.