Robust Centralized Controller Design for Time Delayed TITO Processes with RHP Poles

Abstract

This paper describes a fully cross coupled control system design of two input and two output processes with RHP poles. It is obtained by employing the concepts of energy transmission ratio and effective relative gain. It satisfies the robustness stability margins of the processes. With this method both off-diagonal decouplers and main diagonal controllers can be easily designed using relative gain and relative frequency response based PI tuning rules. The advantage of method is the overall control system performance will be better compared with existing methods like set point weighted method and control system is more robust under uncertainties in the processes. This technique can still work satisfactory performance even under significant model mismatches occurred in the process control industry. The PI/PID based control is dominant used at lower level of the control system. With this fully cross coupled based PID controller the process will settle within a small time. To show the efficacy of the proposed method, the method has applied for the two processes with RHP poles and results has been discussed. The result shows the better performance as compared to the other related approaches.