Simulink Control Design™ - MathWorks

Design PID Controller Using Simulated I/O Data

This example shows how to tune a PID controller for plants that cannot be linearized. You

use PID Tuner to identify a plant for your model. Then tune the PID controller using the

identified plant.

This example uses a buck converter model that requires Simscape™ Electrical™ software.

Buck Converter Model

Buck converters convert DC to DC. This model uses a switching power supply to convert a

30V DC supply into a regulated DC supply. The converter is modeled using MOSFETs

rather than ideal switches to ensure that device on-resistances are correctly represented.

The converter response from reference voltage to measured voltage includes the

MOSFET switches. PID design requires a linear model of the system from the reference

voltage to the measured voltage. However, because of the switches, automated

linearization results in a zero system. In this example, using PID Tuner, you identify a

linear model of the system using simulation instead of linearization.

For more information on creating a buck converter model, see “Buck Converter”

(Simscape Electrical).

open_system('scdbuckconverter')

sim('scdbuckconverter')

7 PID Controller Tuning