Design and implementation of coupled tank control using PID controller

Abstract

Liquid level control is crucial in the industrial field, where the liquid level is required to be maintained to prevent overflows. The coupled tanks system is common in industrial control processes. The system consists of two tanks, with the liquid flowing through them. Each tank contains an inlet and an outlet. The main principle of controlling this system is to maintain a constant level of liquid in each tank when there are inflows and outflows of liquid. To control the liquid level in the coupled tanks system, the mathematical model of the system has been derived and evaluated in the form of a linear model. The mathematical model of the system was developed to apply for the PID control system, considering the dynamic behavior of the system. Once the system had been designed, the corresponding model was implemented using the MATLAB and Simulink software. According to simulation and experimental results, the PID control worked well to stabilize the system at specific set point values.