Design of gain scheduling adaptive control for continuous stirred tank reactor

摘要

The continuous stirred tank reactor (CSTR) is one of the versatile reactors finding its application in many chemical industries and exhibit reasonably high non-linear behaviour. The non-linearity present in the system imposes complication in the design of conventional PID controllers. The piece-wise linear models for entire operating regions of the CSTR is obtained and controllers are designed based on the obtained models. If there exists some auxiliary variables that correlate well with the changes in process dynamics, then it is possible to reduce the effects of parameter variations simply by varying the parameters of the controller as functions of auxiliary variables, called as gain scheduling control. A gain scheduling adaptive and classical pi control strategies are designed and evaluated for continuous stirred tank reactor, which shows appreciable non-linear characteristics through simulations. The performance of each designed controller is evaluated based on certain performance indices.