TWO NONLINEAR OBSERVERS BASED SLIDING MODE CONTROLLER FOR A MULTIVARIABLE CONTINUOUS STIRRED TANK REACTOR

Mokhtar Khenfer, Bachir Daaou, and Mohamed Bouhamida

Keywords

Multivariable CSTR, nonlinear observer, sliding mode controller,sliding mode observer, state estimation

Abstract

This paper deals with the design of a sliding mode observer based sliding mode control law for a multivariable continuous stirred tank reactor. Two types of nonlinear observers are proposed to estimate the whole process state variables. The first observer type is a high-gain observer, whereas the second one uses a sliding mode approach. Both observers are coupled with a nonlinear controller, designed based on a sliding mode controller (SMC). The control objective is to perform accurate tracking of the temperature and concentration in the reactor. The asymptotical stability of the closed-loop system is shown by the Lyapunov stability theorem. Computer simulations are developed for showing the performance of the proposed approach.

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