Receding Horizon Controller for Decoupled Two-Input Two-Output Coupled Tank System

The fluid level control strategy is broadly used in various industrial applications, like the boiler process, chemical process industry, nuclear power reactor, and distillation of petrochemical refineries in the oil industries. Due to its non-linear characteristics, controlling the fluid level of Coupled Tank System (CTS) is difficult. The aims of this paper are intended to present the implementation of model predictive control (MPC) in a systematic manner for a CTS. In this paper, a decouple Two-Input Two-Output (TITO) CTS is implemented with the design MPC controller. To decouple TITO into two distinct Single-Input single-Output (SISO) processes an inverted decoupling method has been developed. The design MPC is implemented for each SISO process. The steps related to the design of the MPC technique are as follows: develop a CTS state-space model, construct a constrained discrete-time model, then an MPC controller is designed for the developed decouple model. The output of the suggested controller is analyzed with the current PI controller developed based on the same requirements to validate the proposed approach. Simulation studies show that the suggested MPC controller provides better performance than the PI controller.