Power (3ph, Instantaneous)

(To be removed) Compute three-phase instantaneous active and reactive powers

The Specialized Power Systems library will be removed in R2026a. Use the Simscape™ Electrical™ blocks and functions instead. For more information on updating your models, see Upgrade Specialized Power System Models to use Simscape Electrical Blocks.

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

Description

The Power (3ph, Instantaneous) block computes the three-phase instantaneous active power P (in watts) and reactive power Q (in vars) associated with a periodic set of three-phase voltages and currents. These formulas are used to perform the calculations:

$$\begin{array}{l}P=V_a\cdot I_a+V_b\cdot I_b+V_c\cdot I_c\\ Q=\frac{1}{\sqrt{3}}\left[(V_b-V_c)\cdot I_a+(V_c-V_a)\cdot I_b+(V_a-V_b)\cdot I_c\right]\end{array}$$

With these formulas, a current flowing into an RL circuit produces a positive P and a positive Q.

The computed instantaneous reactive power is accurate only for balanced and harmonic-free three-phase voltages and currents.

Ports

Input

Vabc — Three-phase voltage signal

Three-phase voltage signal.

Iabc — Three-phase current signal

Three-phase current signal.

Output

P — Three-phase instantaneous active power

Three-phase instantaneous active power P, in watts.

Q — Three-phase instantaneous reactive power

Three-phase instantaneous reactive power Q, in vars.

Extended Capabilities

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

Version History

Introduced in R2013a