Power (3ph, Phasor)

Compute three-phase active and reactive powers using three-phase voltage and current phasors

Library

Simscape / Electrical / Specialized Power Systems / Sensors and Measurements

Description

The Power (3ph, Phasor) block outputs total active power P and reactive power Q of a three-phase voltage-current phasor signal pair. P and Q are computed as follows:

$P + j Q = \frac{1}{2} (V a \times I a^{*} + V b \times I b^{*} + V c \times I c^{*})$

Ia^*, Ib^*, Ic^* are the complex conjugates of Ia, Ib, and Ic.

The figure shows sign conventions:

Inputs and Outputs

Vabc: The three-phase phasor (three complex signals) voltage signal, in volts peak.
Iabc: The three-phase phasor (three complex signals) current signal, in amperes peak.
P: Returns the total active power, in watts.
Q: Returns the total active power, in vars.

Characteristics

Direct Feedthrough	Yes
Dimensionalized	No

Examples

The power_PhasorPowerMeasurements example shows the use of the Power (3ph, Phasor) block.

Version History

Introduced in R2013a