IMC based PI controller for a two tank interacting process system

Abstract: The objective of the work is to maintain the level in the closed loop at desired set value. This paper emphasis an implementation of internal mode control (IMC) to obtain an optimal PI control setting for interacting. System identification of the process is done by process reaction curve method. The conventional PI controller cannot reach satisfactory result. The gain parameters of PI control are obtained by IMC tuning method. Initially, a Proportional Integral (PI) controller based on IMC-PI setting is designed and the results are compared with Ziegler Nichols (ZN), Skogestad controller settings. The robustness of the controllers are endorsed by imposing both servo and regulatory disturbances. The simulation results confirm that IMC-PI controller has improved dynamic performance disturbance rejection.

Keywords: PI Control, Non-interacting process, System Identification, Tuning methods, Servo and regulatory disturbances and Performance indices.