Modelling and Control of Coupled Tank Liquid Level System using Backstepping Method

Abstract

The level and flow control in tanks are the heart of all chemical engineering system. The control of liquid level in tanks and flow between tanks is a basic problem in the process industries. Many times the liquids will be processed by chemical or mixing treatment in the tanks, but always the level of fluid in the tanks must be controlled and the flow between tanks must be regulated in presence of non-linearity, disturbance and time varying system parameters. This work introduce the approach of modelling and compute a level backstepping control strategy with pure feedback form for non-linear modelled coupled tanks system.The goal of the control algorithm is to track the desired level of liquid in second tank by using flow rate of liquid into first tank as the manipulated variable. The designed non-linear controller is capable of tracking the desired water level for all set points with high degree of accuracy, maximally fast and without significant overshoot.