Question

what are the steps needed to be done in Matlab in order to design a PID controller? ( i need a step-by-step guidelines) the transfer function is already obtained. how do you adjust the value in order to get the best value for PID controller?

Answer 1

Let, our system be:

First, run this segment of MATLAB Code:

sys=tf(1,[1 2 4]);
pidtool(sys)

NOTE: If you have a different transfer function, define that instead of this one.

This will open the PID controller designer tool for you.

• Select the Controller type as PID.
• Select the controlling specifications

1. Transient Behaviour
2. Response Time

• ​​​​​​​After putting all the parameters you can see the controller gains: Kp, Ki, Kd at the bottom-right corner.

• You can specify Frequency domain parameters by selecting Domain as "Frequency"

1. ​​​​​​​Bandwidth
2. Phase Margin

• Click on the Export symbol
• Select "Export PID Controller"
• Click on OK

This will export your designed controller to the Matlab Workspace, and you can access this controller using the default variable name "C".