Design and implementation of water level control using gain scheduling PID back calculation integrator Anti Windup

Abstract

Conventional PID controller is a simplest known controller and has been used in almost all process industries for controlling process parameter at desired set point. However, the weakness of the controller is largely depend on the parameter of the controlled object. As the dynamics process of a water tank is nonlinear, it also has nonlinear behaviour between the input and output. This paper demonstrates that Gain Scheduling PID with Back Calculation Integrator Antiwindup enables to enhance the response of automatic water level control system performance. A mathematical model of a first order tank system is considered and simulated to determine fine tunes and schedules for the controller parameter based on trial and error experiment so as to adapt with all operating points. The system performance comparison of various setpoint given to the system is performed to prove that the Gain Scheduling PID with Back Calculation Integrator Antiwindup outpaces conventional PID controller.