Model based Controller Design for a Spherical Tank

The aim of this paper is to implement optimum controller for a spherical tank. The objective of the controller is to maintain the level inside the process tank in a desired value. The real time implementation of the process is designed and implemented in MATLAB using data acquisition module. The process model is obtained step test method. The identified model is in the form of first order plus delay time (FOPDT) process. Controller design is compared based on conventional Proportional Integral (PI) with Internal Model Control (IMC) based on Skogestad’s settings in terms of performance indices. Out of the control algorithms IMC outperforms in no overshoot, faster settling time, better set point tracking and produces lower performance indices.

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