Comparison of PID and FLC type controller designed for ohmic heating system

In this study, mathematical modeling of an ohmic heating system has been done, firstly. Then, two different control approaches, PID and fuzzy logic control, have been considered to control of mathematically modeled ohmic heating system. An optimal PID controller has designed based on Ziegler-Nicholas method. In order to make a comparison, a fuzzy logic controller (FLC) has also been designed and obtained results have been compared, finally. Based on the obtained results, FLC has showed more powerful, stable and convenient control action to control of an ohmic heating system. Applying designed FLC, it can be concluded that the ohmic heating system behavior is more stable and has less settling time with no overshoot have been observed.