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Power (3ph, Phasor)

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

Library

Control and Measurements/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+jQ=12(Va×Ia+Vb×Ib+Vc×Ic)

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 FeedthroughYes
DimensionalizedNo

Examples

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

Introduced in R2013a

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