IMC and Adaptive Associated with PID Controllers for Nonlinear Level Process

Abstract

Level control in a specially shaped tanks is crucial in many industries like food manufacturing industries, petroleum industries and hydrometallurgical industries. The level of the tank can be controlled by controlling the head of the tank or by means of balancing the inflow rate and out flow rate. Different shapes of the tanks are utilised in the process industries according to the application. For high viscous fluids and complete drain is required the conical bottom tanks are prefered. But the nonlinearity due to the tapered bottom area of the tank makes the level control in the conical tank the toughest task. The conventional controllers will not gives a clear solution for this case. This work deals with development of a suitable controller for such process. The conventional three mode controller is designed and it is modified with the Internal Model Controller(IMC) and Adaptive PID controller techniques. The designed controllers are simulated using MATLAB/SIMULINK environment. From the simulation results it has been proved that the adaptive controlling techniques give good control performance than other controllers.