A Proportional-Integral (PI) Controller Design and Implementation for Decoupled Two-Input Two-Output-Coupled Tank System with Dead-time

In the present paper, a Proportional-Integral (PI) controller design methodology is proposed for liquid level control in decoupled Two Input Two Output (TITO)-coupled tank system. First Order Plus Dead Time (FOPDT) model of TITOcoupled tank system is identified by using the least square estimation method. An inverted decoupler is designed to decouple the TITO-coupled tank process into two separate Single Input Single Output (SISO) processes. A model reduction method is used to reduce the order of decoupled systems. The designed PI controller is implemented in both simulation and real-time. Simulation and real-time results show that the proposed PI controller gives better tracking performance such as 18.28% lower setting time, 185.24% lower MP (%) than the reported work in the literature. In control action performance aspect, the proposed PI controller gives 13.40% lower 2-norm when compare to reported work in the literature.