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Park to Clarke Angle Transform

Implement dq0 to αβ0 transform

  • Library:
  • Simscape / Electrical / Control / Mathematical Transforms

Description

The Park to Clarke Angle Transform block converts the direct, quadrature, and zero components in a rotating reference frame to alpha, beta, and zero components in a stationary reference frame. For balanced systems, the zero components are equal to zero.

You can configure the block to align the phase a-axis of the three-phase system to either the q- or d-axis of the rotating reference frame at time, t = 0. The figures show the direction of the magnetic axes of the stator windings in the three-phase system, a stationary αβ0 reference frame, and a rotating dq0 reference frame where:

  • The a-axis and the q-axis are initially aligned.

  • The a-axis and the d-axis are initially aligned.

In both cases, the angle θ = ωt, where

  • θ is the angle between the a and q axes for the q-axis alignment or the angle between the a and d axes for the d-axis alignment.

  • ω is the rotational speed of the d-q reference frame.

  • t is the time, in s, from the initial alignment.

The figures show the time-response of the individual components of equivalent balanced dq0 and αβ0 for an:

  • Alignment of the a-phase vector to the q-axis

  • Alignment of the a-phase vector to the d-axis

Equations

The Park to Clarke Angle Transform block implements the transform for an a-phase to q-axis alignment as

[αβ0]=[sin(θ)cos(θ)0cos(θ)sin(θ)0001][dq0]

where:

  • d and q are the direct-axis and quadrature-axis components of the two-axis system in the rotating reference frame.

  • 0 is the zero component.

  • α and β are the alpha-axis and beta-axis components of the two-phase system in the stationary reference frame.

For an a-phase to d-axis alignment, the block implements the transform using this equation:

[αβ0]=[cos(θ)sin(θ)0sin(θ)cos(θ)0001][dq0]

Ports

Input

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Direct-axis and quadrature-axis components and the zero component of the system in the rotating reference frame.

Data Types: single | double

Angular position of the rotating reference frame. The value of this parameter is equal to the polar distance from the vector of the a-phase in the abc reference frame to the initially aligned axis of the dq0 reference frame.

Data Types: single | double

Output

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Alpha-axis component,α, beta-axis component, β, and zero component of the two-phase system in the stationary reference frame.

Data Types: single | double

Parameters

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Align the a-phase vector of the abc reference frame to the d- or q-axis of the rotating reference frame.

References

[1] Krause, P., O. Wasynczuk, S. D. Sudhoff, and S. Pekarek. Analysis of Electric Machinery and Drive Systems. Piscatawy, NJ: Wiley-IEEE Press, 2013.

Extended Capabilities

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

Introduced in R2017b