Modeling error effect on performance of a second order delayed process model

Abstract

In a process industry it is desirable to have robust controller so that required response is obtained even in the presence of disturbances. In this paper, SOPDT model is considered and PID controller is designed for it. Robustness of PID controller is checked by perturbation of model parameters. Model parameters K (gain), τ1, τ2 (time constants) are perturbed by 15% and response obtained for perturbed system is compared with that of original system.