Comparative study of fuzzy PD controller and conventional controllers

Abstract

In this articale we present a PD-type fuzzy controller. The performance of PD-type fuzzy controller is compared with that of conventional controllers like PD, PI and PID controllers. the effectiveness of the scheme is established through simulation experiments on various types of second order processes such as i) Marginally stable ii) Stable and linear and iii)unstable system. The performance of PD-type fuzzy controller is compared with that of conventional controller for each process. For a clear comparison between the conventional and FLC's several performance measures such as, peak overshoot (%OS), setting time (t <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> ), rise time(t <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</sub> ), integral absolute error (IAE) are used. each process is tested with set-point change. The results for various types of process reveals the conventional controllers are not suitable for higher order and non-linear process especially for unstable process.