Power (dq0, 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 (dq0, Instantaneous) block computes the three-phase instantaneous active and reactive powers from a periodic set of three-phase voltages and currents expressed in the dq0 reference frame. These formulas perform the calculations:

$$\begin{array}{l}P=\frac{3}{2}\times \left(V_d\cdot I_d+V_q\cdot I_q+2\cdot V_0\cdot I_0\right)\\ Q=\frac{3}{2}\times \left(V_q\cdot I_d-V_d\cdot I_q\right)\end{array}$$

The inputs Vdq0 and Idq0 (direct axis, quadrature axis, and zero-sequence components) of the three-phase voltage and current are normally connected to the outputs of the abc-to-dq0 Transformation block.

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

Vdq0 — Voltage signal expressed in dq0 reference frame

Voltage signal expressed in the dq0 reference frame.

Idq0 — Current signal expressed in dq0 reference frame

Current signal expressed in the dq0 reference frame.

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