Design and Implementation of Stable PID Controller for Interacting Level Control System

In this present study a Stability Region Analysis method for designing PID controller for time delay system is validated with real time experimentation with Interacting process. The higher order system is reduced into first order plus time delay (FOPDT) model. A polyhedral sets in the 3D (three dimensional) search band parameter space Kp Ki Kd is resulted from set of stable PID controllers for a fixed value of Kd, and it is faster and simple to identify these regions. The stability region verification is done with dual locus diagram. An approach presented works satisfactorily without sweeping over the parameters, and without any complicated mathematics. While designing optimization method based advanced PID controllers it is beneficial and reliable to determine range of variables. We have presented one simulation example and experimental validation on Interacting Level Control System.