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Field-Oriented Current Controller

Implement current control for three-phase motors using field-oriented control (FOC) technique

Since R2023b

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Libraries:
Motor Control Blockset / Controls / Controllers

Description

The Field-Oriented Current Controller block implements current control for a three-phase permanent magnet synchronous motor (PMSM) or an AC induction motor (ACIM) using the FOC algorithm. You can input the reference d- and q-axis currents, measured stator phase a and b currents, motor electrical position, as well as PI controller parameters to compute three phase voltages that drive the motor.

The block uses Clarke and Park transformations to compute actual d- and q-axis currents from the measured phase currents and motor electrical position. It uses the PI Controller blocks to implement d- and q-axis current controllers. The current controller loop uses the reference and actual d- and q- axis currents to generate reference voltages that drive the motor. For more information about the FOC algorithm implemented by the block, see Field-Oriented Control (FOC).

The block supports SI and per-unit inputs, however, units of all block inputs should be identical.

Examples

Swap Motors with Single Model Deployment of Sensor-Based FOC Algorithm

Swap Motors with Single Model Deployment of Sensor-Based FOC Algorithm

Run a permanent magnet synchronous motor (PMSM) in an industrial drive application setup using position-sensor-based field-oriented control (FOC). Industrial drives enable you to swap motors in real time. These drives enable you to replace a motor with a new one without repeated deployment of code. An industrial drive setup needs a fixed inverter and software that has the ability to adapt the control algorithm according to the new motor using only the updated nameplate parameters.

Open Example
Swap Motors with Single Deployment of Sensorless FOC Algorithm

Swap Motors with Single Deployment of Sensorless FOC Algorithm

Run a permanent magnet synchronous motor (PMSM) in an industrial drive application setup using a sensorless field-oriented control (FOC). The example uses a sensorless Flux Observer to estimate the motor position. Industrial drives enable you to replace a motor with a new one without repeated deployment of code. An industrial drive setup needs only nameplate parameters to adapt the software to the new motor.

Open Example
Generate Motor Control Models for Selected Algorithm and Hardware

Generate Motor Control Models for Selected Algorithm and Hardware

Use Motor Control Blockset™ to generate a Simulink® model that is configured for a specific hardware and motor control technique.

Open Live Script

Ports

Input

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Reference motor currents along the d- and q-axis of the rotating d-q reference frame.

IdqRef = [IdRef, IqRef]

Data Types: single | double | fixed point

Measured phase a and phase b currents of the motor.

IabMeas = [IaMeas, IbMeas]

Data Types: single | double | fixed point

Electrical position of the motor.

Data Types: single | double | fixed point

Saturation limit of the d- and q-axis reference voltages generated by the internal PI controllers. This value depends on the DC bus voltage (Vdc) and the selected PWM method. Generally, this value is equal to Vdc/2 (for SPWM) and Vdc/sqrt(3) (for SVM). For more information about the PWM techniques, see PWM Reference Generator.

Data Types: single | double | fixed point

Gains of the d-axis and q-axis PI controllers (Kp and Ki, respectively) multiplexed with the block sample time (Ts).

Kp,Ki*Ts = [Kp(d-axis), Ki*Ts(d-axis), Kp(d-axis), Ki*Ts(d-axis)]

Data Types: single | double | fixed point

Initial values of the internal PI controller integrators multiplexed with their limits.

PIConfig = [Upper saturation limit of PI controller integrators, Lower saturation limit of PI controller integrators, Initial value of d-axis PI controller integrator, Initial value of q-axis PI controller integrator]

Data Types: single | double | fixed point

Signal that resets the PI controllers used in the block:

  • 1 — Reset internal PI controllers.

  • 0 — No action.

Data Types: single | double | fixed point

Output

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Stator phase a, b, and c voltages that drive the motor.

Data Types: single | double | fixed point

The internally computed multiplexed signals that the block captures for debugging purposes. The multiplexed signal consists of these elements:

  • Idq — The actual d- and q-axis motor currents computed from the motor phase currents.

  • Vdq — The d- and q-axis motor voltages computed by the internal d- and q-axis current PI controllers.

  • Vαβ — The α- and β-axis voltages that the block computes internally using inverse Park transformation of Vdq.

  • Iαβ — The α- and β-axis currents that the block computes internally using Clarke transformation of the IabMeas input.

Data Types: single | double | fixed point

Parameters

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Unit of the motor electrical position input θe.

Size of the lookup table array used by the internal sine-cosine lookup algorithm that computes the sine and cosine of the motor electrical position. This parameter accepts a value in the range [125, 4095].

Align either the d- or q-axis of the rotating reference frame to the α-axis of the stationary reference frame.

Set the saturation method to one of these:

  • D-Q equivalence

  • Prioritize D axis

  • Prioritize Q axis

Pulse-width modulation technique for the three-phase voltage that the block outputs, specified as one of these:

  • SVM: space vector modulation

  • SPWM: sinusoidal PWM

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™.

Version History

Introduced in R2023b

See Also

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