PI controller


Thread Starter


I am tuning four PI controllers,total 8 parameters. the problem is how to tune them correctly. Can anybody tell me the method about tuning multivariable Pi controller?

Thanks in advance!

david mertens

If this really is a multivariable process, meaning that each actuator has influence on all process variables (the process variables are not independent of each other) then I don't think you will ever be able to tune the PI controllers. For this kind of problems MPC (model predictive control) controllers are commonly used. More information on MPC can be found at:
If however your process variables are independent of each other, then the normal tuning rules apply, a good starting point would be:
Good luck.
Perform a relative gain analysis RGA to gauge the interaction between the control loops. This will aid in pairing of the CV to PV.