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Frequency (Phasor)

Measure phasor signal frequency

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  • Frequency (Phasor) block

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)

Performance of Frequency Measurement (Phasor)

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

Ports

Input

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Phase angle variation of the measured signal, in rad.

Data Types: single | double

Output

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Frequency of the input signal, in Hz.

Data Types: single | double

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

Data Types: single | double

Parameters

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Nominal frequency of the input signal, in Hz.

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

See Also