Modelling and Real Time Implementation of Digital Pi Controller for a Non Linear Process.pdf

In Process industries, control of process parameters for a nonlinear process is one of the important issues identified in literature. The nonlinear process considered for modeling is spherical tank liquid level system. Control of liquid level in a spherical tank is nonlinear due to the variation in the area of cross section of the level system with change in shape. System identification of this nonlinear process is done using black box model, which is identified to be nonlinear and approximated to be first order plus dead time model. Here the Digital PI controller is designed using Ziegler Nicholas Tuning rule. The real time implementation of the process is designed and implemented in MATLAB using VMAT-01 Data Acquisition Module.