Simulation and Control of a Nonlinear CSTR System by Fuzzy-Logic Controller and Comparison with Traditional Controller

In this paper, modeling, simulation and control of a CSTR with a fuzzy logic PD controller and traditional PD controller have been investigated. A first order reaction is assumed to take place within the reactor and a fuzzy logic controller is used to control the performance of this process. Membership functions for controller input and output are selected as triangular shape. The results showe that the offset and response time values of fuzzy logic PD controller for a step change in concentration of reactant in reactor outlet are significantly less than traditional PD controller and the response is smoother. So fuzzy logic PD controller is more reliable than traditional PD controller to overcome disturbances especially in nonlinear systems.