Application of various PID Controller Tuning Techniques for a Temperature System

Abstract

Control of temperature level in the process tank is vital in process industries. A proportional-integral-derivative controller (PID controller) is a control loop feedback mechanism (controller) widely used in industrial control systems.PID control is a control strategy that has been successfully used over many years. This algorithm involves three separate constant parameters. And it is otherwise called as three term controller. Where, P depends on the present error, I on the accumulation of past errors, and D is a prediction of future errors, based on current rate of change. It is highly used in chemical industries because of their success rate in practical applications, robustness and simplicity The PID temperature control algorithm is used for the control of almost all loops in the process industries, and is also the basis for many advanced control algorithms and strategies. A PID temperature controller works by measuring the current temperature to generate the error signal and altering the output to bring it closer to the target. The main alternative for temperature PID controller is ON/OFF controller which works like a thermostat. To determine the appropriate controller parameters settings, a conventional PID control tuning techniques and model based PID were characterized and their results to be obtained are simulated. With the yield of time domain and error criterion analysis, the most suitable controller for temperature controlled process is obtained. The best among the tuned controlled technique is pointed out as a good result of minimum rise time, setting time and overshoot. General Terms Process Control, Control System.