Modeling and Implementation of LabVIEW based Non-Linear PI Controller for a Conical Tank

Abstract

The control of liquid level in tank is a basic problem in process industries. The conical tank level process is considered to be a non-linear process. The control of conical tank is presenting a challenging problem due to its non-linearity. The modeling aspect of conical tank is discussed in this paper. The piecewise response of the system is studied and the gain and time constants for the different regions were tabulated. A structure of wiener based nonlinear controller is developed using LabVIEW and it is implemented in real time. The response of the wiener based nonlinear controller is compared with the classical PI controller.

Keywords: Nonlinear PI controller, Wiener Model, Conical Tank