Design and optimization of multivariable controller for CSTR system

Multivariable systems exhibit complex dynamics because of the interactions between manipulated and controlled variables. In this paper, a control scheme for controlling reactor temperature and pressure in CSTR is implemented. The controller design is distributed into two parts: Initially, the judicious pair of loop configuration is determined using Relative Gain Array technique. Then, a decentralized PI controller is designed to minimize the interaction effects using auto tuning algorithm for two different cases. The servo and regulatory problems confirm the effectiveness of the proposed design when one of the manipulated parameters pressure is fixed and both the manipulated parameters are varied. MATLAB and SIMULINK tools are used for system modeling and controller design. The performance indices of the Multiple Input Multiple Output based decentralized PI controller for CSTR system is also evaluated and presented.