SIMULATION PERFORMANCE OF PID AND FUZZY LOGIC CONTROLLER FOR HIGHER ORDER SYSTEMS

The proportional-integral derivative controller (PID Controller) is a control loop feedback mechanism (Controller) widely used in automatic process control applications in industry today to regulate flow, temperature, pressure, level, and many other industrial process variables. The high demand of PID controller is due to its fine control capabilities in a wide range of operating conditions. This paper presents design of PID controller using Ziegler–Nichols (ZN) technique for higher order systems. A fuzzy logic controller using simple approach and smaller rule set is also proposed. The aim of designed fuzzy controller is to present better control compared with the existing PID controller. The simulation is done using Matlab/Simulink by comparing the performance of two controllers for higher order systems. It is finally observed that fuzzy logic controller has better control on timing parameters such as settling time, rise time, maximum overshoot as compared to the existing PID tuning techniques.