IMC and Adaptive Associated with PID Controllers for Nonlinear Level Process

Abstract

Level control in specially shaped tanks is crucial in many industries such as food manufacturing, petroleum and hydrometallurgy. The level of the tank can be adjusted by controlling the head of the tank or by balancing the inflow and out flow rates. Different tank shapes are used in process industries, according to their application. For high viscous fluids where complete drainage is required, conical-bottom tanks are preferred. But the nonlinearity due to the tank’s tapered bottom makes level control a difficult task. Conventional controllers do not offer an easy solution in this case. This work deals with the development of a suitable controller. A conventional three-mode controller was designed and modified using the Internal Model Controller (IMC) and the Adaptive PID Controller techniques. The designed controllers were simulated in the MATLAB/SIMULINK environment. From the simulation results it was proven that the adaptive controlling techniques give a better control performance than other controllers.
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