Design Of FOPDT PID Controller By Different Tuning Methods For Industrial Process Control

PID controllers have become the most predominant control element for industrial process control . Programs used for industrial process control are written in many software tools but this paper focuses on MATLAB simulation . In this paper, an optimal method for tuning PID controllers for first order plus time delay systems is presented using dimensional analysis and numerical optimization techniques,. PID tuning formulas are derived for first order plus delay time (FOPDT) processes based on IMC principle and comparing it with the tuning methods proposed by Ziegler-Nichols’ and Cohen Coon . To achieve smooth output response, examples from previous works are included for comparison, and results confirm the improvement in the output response. Simulation results show that the proposed method has a considerable superiority over conventional techniques.