Enhanced Performance of Model Based PID Controller for

Enhanced Performance of Model Based PID Controller for Process Industry ◆ Scope v ◆ Objective PID controller is very effective, To develop the state-of-the-art design method of the efficient, and easy to understand with advanced PID controller for the process industries. robust performance in the regulatory level. ▶ IMC filter design for the PID controller PID filter controller design for time delayed processes Modern control systems have enabled ▶ Enhanced disturbance rejection for time delayed processes the PID controller to be combined with ▶ Two-degree-of-freedom control scheme for open loop various simple control algorithms to unstable processes with time delay ▶ v enhance the control performance. Model Based Analytical IMC-PID Controller Design ◆ A design method for a PID cascaded with a lead-lag compensator for the second-order processes with time delay. ◆ Simulation study of the proposed method PID cascaded with a lead-lag compensator IMC-PID Controller Design for SOPDT Process λ guidelines: It is suggested that robust control performance can be achieved by considering the starting value of λ to be equal to the process time delay. If the selected λ does not satisfy the performance and robust stability criteria, then λ is monotonously increased or decreased on–line until the desirable trade–off between performance and its robust stability is achieved. ◆ Conclusions The proposed method covered a broad class of second–order stable and unstable processes with time delay and consistently achieved superior Remark : A robust control performance was achieved by using a value of 0. 1 b instead of b. performance for several classes of processes. On-Line PI/PID Controller Tuning for Closed-Loop ◆ Motivation v To avoid the time consuming procedures of the plant test and further controller tuning. The control personals makes an effort for on-line controller tuning. In on-line tuning the response data are used to estimate tuning parameters. ◆ Main Objectives A new method for on-line controller tuning has been developed based on experimental test performed during closedloop operation. v. Process divided in three groups for on-line tuning ØStable (first order, second and higher order with time delay) ØIntegrating with time delay ØUnstable process (first and higher order with time delay) Summary: Several simple mathematical relations have been developed for the integral and derivative time constant. The simulation is conducted for a broad class of processes and results shows a significant improvement in on-line tuning. Homepage : http: //psdc. yu. ac. kr TEL : +82 053) 810 -3241 E-mail : smzoha 2002@hotmail. com (M. Shamsuzzoha)