  Coupled Tank system used for liquid level control is a model of plant that
has usually been used in industries especially chemical process industries.
Level control is also very important for mixing reactant process. This survey
paper tries to presents in a systemic way an approach predictive control
strategy for a system that is similar to the process and is represented by two
liquid tanks. This system of coupled Tank is one of the most commonly available
systems representing a coupled Multiple Input Multiple Output (MIMO) system.
With 2 inputs and 2 outputs, it is the most primitive form of a coupled
multivariable system. Therefor the basic concept of how the coupled tanks
system works is by using a numerical system which it operates with a flow
control valve FCV as main control of the level of liquid in one tank or both
tanks. For this paper, MPC algorithm control is used which will be developed
below. And it is focuses on the design and modelling for coupled tanks system.
The steps followed for the design of the controller are: Developing a state
space system model for the coupled tank system then design an MPC controller
for the developed system model. And study the effect of the disturbance on
measured level output. Note that the implementation Model Predictive Controller
on flow controller valve in a Coupled Tank liquid level system is one of the
new methods of controlling liquid level.
