Hi, I have some difficulties with PI controller design, please, take a look.
Transfer function of the system is
Denumerator from the closed-loop transfer function (considering PI controller, where K is proportional gain, and T is integral gain) is
I've tried Graham-Lathrop Method, but I got 2 equations with 3 parametres:
I've tried Naslin method and manual tuning as well without any success. Then I've tried to design P controller only, but got negative proportional gain...
What am I doing wrong?
Any advice would be greatly appreciated! Thanks for your time.
NOTE: sorry for the external images, but latex compilator isn't working right now.