Simulink Control Design™ - MathWorks

Design Family of PID Controllers for Multiple Operating

Points

This example shows how to design an array of PID controllers for a nonlinear plant in

Simulink that operates over a wide range of operating points.

Open Plant Model

The plant is a continuous stirred tank reactor (CSTR) that operates over a wide range of

operating points. A single PID controller can effectively use the coolant temperature to

regulate the output concentration around a small operating range that the PID controller

is designed for. However, since the plant is a strongly nonlinear system, control

performance degrades if operating point changes significantly. The closed-loop system

can even become unstable.

Open the CSTR plant model.

mdl = 'scdcstrctrlplant';

open_system(mdl)

7 PID Controller Tuning