Discrete PI Controller with anti-windup and reset

Implement discrete PI controller with anti-windup and reset functionality

• Library:

• Motor Control Blockset / Controls / Controllers

• 

Description

The Discrete PI Controller with anti-windup and reset block performs discrete-time PI controller computation using the error signal and proportional and integral gain inputs. The error signal is the difference between the reference signal and the measured feedback. The block outputs a weighted sum of the input error signal and the integral of the input error signal.

You can tune the Discrete PI Controller coefficients (K_p and K_i) either manually or automatically. Automatic tuning requires Simulink^® Control Design™ software.

The block also supports anti-windup functionality, which makes the block output to comply with the register size of the processor. You can reset the integrator to the initial condition (y₀).

We recommend that you use fixed-step discrete solver for this block to enable code generation and ensure accurate simulation.

Ports

Input

error — Variation of system output from expected value

scalar

Difference between a reference signal and the system output.

Data Types: single | double | fixed point

Kp — Proportional gain

scalar

Proportional gain value that you can compute either manually or automatically.

Data Types: single | double | fixed point

Ki*Ts — Integral gain pre-multiplied by integrator sample time

scalar

Integral gain input that you can compute either manually or automatically. You must premultiply the integral gain value by the integrator sample time (T_s) for the block to execute within asynchronous interrupts.

Data Types: single | double | fixed point

Reset — External reset signal

scalar

External pulse that resets the block output to the value of the initial output from the integrator (y0).

Data Types: single | double | fixed point

y0 — Value of initial output from integrator

scalar

Initial value of the integrator or block output after receiving a reset pulse.

Data Types: single | double | fixed point

Output

y — PI controller output

scalar

Control signal that is identical to the reference signal.

Data Types: single | double | fixed point

Parameters

Upper saturation limit — Upper limit for block output

1 (default) | scalar

The block holds the output at the Upper saturation limit whenever the weighted sum of the proportional and integral actions exceeds this value.

Lower saturation limit — Lower limit for block output

-1 (default) | scalar

The block holds the output at the Lower saturation limit whenever the weighted sum of the proportional and integral actions goes below this value.

Model Examples

Field-Oriented Control of Induction Motor Using Speed Sensor

Implements the field-oriented control (FOC) technique to control the speed of a three-phase AC induction motor (ACIM). The FOC algorithm requires rotor speed feedback, which is obtained in this example by using a quadrature encoder sensor. For details about FOC, see Field-Oriented Control (FOC).

Field-Weakening Control (with MTPA) of PMSM

Implements the field-oriented control (FOC) technique to control the torque and speed of a three-phase permanent magnet synchronous motor (PMSM). The FOC algorithm requires rotor position feedback, which is obtained by a quadrature encoder sensor. For details about FOC, see Field-Oriented Control (FOC).

Field-Oriented Control of PMSM Using Hall Sensor

Implements the field-oriented control (FOC) technique to control the speed of a three-phase permanent magnet synchronous motor (PMSM). The FOC algorithm requires rotor position feedback, which is obtained by a Hall sensor. For details about FOC, see Field-Oriented Control (FOC).

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™.