Documentation

ACIM Feed Forward Control

Decouple d-axis and q-axis current to eliminate disturbance

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Library:
Motor Control Blockset / Controls / Control Reference

Description

The ACIM Feed Forward Control block decouples d-axis and q-axis current controls and generates the corresponding feed-forward voltage gains for field-oriented control of induction motor.

The block accepts feedback values of d-axis and q-axis currents and the mechanical speed of the rotor.

Equations

If you select Per-Unit (PU) in the Input units parameter, the block converts the inputs to SI units before performing any computation. After calculating the output, the block converts the values back to per-unit (PU) values.

The machine inductances and stator flux are represented as,

$L_{s} = L_{l s} + L_{m}$

$L_{r} = L_{l r} + L_{m}$

$σ = 1 - (\frac{L_{m}^{2}}{L_{s} \cdot L_{r}})$

$λ_{s d} = \frac{L_{m}}{L_{r}} λ_{r d} + σ L_{s} i_{s d}$

$λ_{s q} = σ L_{s} i_{s q}$

These equations describe the computation of feed-forward gain by the block.

$V_{s d}^{F F} = ω_{e} λ_{s d}$

$V_{s q}^{F F} = - ω_{e} λ_{s q}$

where:

$ω_{e}$ is the electrical speed corresponding to frequency of stator voltages (Radians/ sec).
$L_{l s}$ is the stator leakage inductance (Henry).
$L_{l r}$ is the rotor leakage inductance (Henry).
$L_{s}$ is the stator inductance (Henry).
$L_{r}$ is the rotor inductance (Henry).
$L_{m}$ is the magnetizing inductance of the motor (Henry).
$σ$ is the total leakage factor of the induction motor.
$λ_{s d}$ is the d-axis flux linkage of the stator (Weber).
$λ_{s q}$ is the q-axis flux linkage of the stator (Weber).
$λ_{r d}$ is the d-axis flux linkage of the rotor (Weber).
$i_{s d}$ and $i_{s q}$ are the stator d- and q-axis currents (Amperes).

Ports

Input

`I_sd` — D-axis stator current
scalar

Stator current along the d-axis of the rotating dq reference frame.

Data Types: single | double | fixed point

`I_sq` — Q-axis stator current
scalar

Stator current along the q-axis of the rotating dq reference frame.

Data Types: single | double | fixed point

`ω_m` — Mechanical speed of rotor
scalar

Mechanical speed of the rotor.

Data Types: single | double | fixed point

Output

`V_sd^FF` — D-axis feed-forward voltage
scalar

Feed-forward voltage along the d-axis of the rotating dq reference frame.

Data Types: single | double | fixed point

`V_sq^FF` — Q-axis feed-forward voltage
scalar

Feed-forward voltage along the q-axis of the rotating dq reference frame.

Data Types: single | double | fixed point

Parameters

`Number of pole pairs` — Number of pole pairs available in motor
`2` (default) | scalar

Number of pole pairs available in the induction motor.

`Stator leakage inductance (H)` — Leakage inductance of stator winding
`6.81e-3` (default) | scalar

Inductance due to leakage flux linked to the stator winding (in Henry).

`Rotor leakage inductance (H)` — Leakage inductance of rotor winding
`6.81e-3` (default) | scalar

Inductance due to leakage flux linked to the rotor winding (in Henry).

`Magnetizing Inductance (H)` — Magnetizing inductance of induction motor
`30e-3` (default) | scalar

Inductance due to the magnetizing flux (in Henry).

`Rated Flux (Wb)` — Rated flux of motor
`38.2e-3` (default) | scalar

Rated flux of the induction motor (in Weber).

`Output Saturation (V)` — Saturation limit for output values
`24/sqrt(3)` (default) | scalar

Saturation limit (in Volts) for the block outputs V_sd^FF and V_sq^FF.

`Input units` — Unit of input values
`Per-Unit (PU)` (default) | `SI Units`

Unit of the input values.

`Base Voltage (V)` — Base voltage for per-unit system
`24/sqrt(3)` (default) | scalar

Base voltage (in Volts) for per-unit system.

Dependencies

To enable this parameter, set Input units to Per-Unit (PU).

`Base Current (A)` — Base current for per-unit system
`5.3611` (default) | scalar

Base current (in Amperes) for per-unit system.

Dependencies

To enable this parameter, set Input units to Per-Unit (PU).

`Base Speed (rpm)` — Base speed for per-unit system
`1500` (default) | scalar

Base speed (in rpm) for per-unit system.

Dependencies

To enable this parameter, set Input units to Per-Unit (PU).

Extended Capabilities

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

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

See Also

Topics

Field-Oriented Control of Induction Motor Using Speed Sensor

Introduced in R2020b

Motor Control Blockset Documentation

Support