How to give my PI controller initial value?

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Adeel Ashraf
Adeel Ashraf on 5 Jan 2021
Commented: Jon on 6 Sep 2023
As my system initialize at 1800 RPM. I want to give inital value to my PI controller to remove the swing curve as you can see in my scope result. So that I can reduce the simulation time.
But I don't know how to do it.

Answers (1)

Jon
Jon on 5 Jan 2021
If you want the inital output of your PI controller to be 1800 when the error signal is zero then set the initial value of the integrator to 1800/I where I is the integrator gain
  4 Comments
Hedi BASBAS
Hedi BASBAS on 6 Sep 2023
Hi Jon,
Could you explain with equations how you choose the inital condition as 1800/K_i ?
Best regards;
Jon
Jon on 6 Sep 2023
For basic PI control the controller output, u is given by u = K_p*e + K_i*E, where e = (y_setpoint - y) and E is the state representing the integrated error. Assume you start your controller with y=y_sestpoint so the error e is zero. Then in order for u = 1800, we have 1800 = K_p*0 + K_i*E. Solving this for E, the initial state of the integrated error, gives E = 1800/K_i

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