Frequency (Phasor)

Measure phasor signal frequency

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Libraries:
Simscape / Electrical / Specialized Power Systems / Sensors and Measurements

Description

The Frequency (Phasor) block measures the frequency of a phasor voltage or current by calculating the derivative of the phase angle variation of the signal, with respect to a synchronous phasor rotating at the specified nominal frequency. A low-pass filter is filtering out the high frequency components of the computed frequency. The unwrapped phase angle is computed and provided at the ΔPhi output.

This diagram shows an example of the Frequency (phasor) block measuring the frequency of a three-phase voltage phasor.

Use this block to measure the frequency of a phasor signal in a power system.

Examples

Performance of Frequency Measurement (Phasor)

The use of two Frequency (Phasor) blocks to measure the frequency variation in a network following a line outage.

• Open Model

Ports

Input

Phase (rad) — Phase angle

scalar

Phase angle variation of the measured signal, in rad.

Data Types: single | double

Output

Freq (Hz) — Frequency

scalar

Frequency of the input signal, in Hz.

Data Types: single | double

ΔPhi (rad) — Phase angle

scalar

Unwrapped phase angle without 2*pi discontinuities, in rad.

Data Types: single | double

Parameters

Nominal frequency (Hz) — Fundamental frequency

60 (default) | positive scalar

Nominal frequency of the input signal, in Hz.

Time constant T for derivative (s) — Filter time constant

0.1 (default) | scalar in the range [0.01,0.1]

The low-pass filter time constant, in seconds.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2018a