Fuzzy anti-windup design

for linear systems with input saturation

H. Ayad1*, S. Doubabi1*, A. Hamzaoui2

1 Université Cadi Ayyad, Faculté des Sciences et Techniques Guéliz,

Laboratoire d’Automatique et Informatique Industrielle,

Avenue Abdelkrim Elkhattabi, B.P 549, Marrakech, Morocco

2 Université de Reims Champagne Ardenne,

Laboratoire d’Automatique et Micro-électronique, France

* Corresponding author. E-mail: ayad@fstg-marrakech.ac.ma

Received : 8 May 2004; revised version accepted : 14 January 2005

Abstract

In this paper, we test fuzzy logic-based compensation method for PID controller and conditioned Technique and compare their performance. As this compensation aims to diminish the effect of windup, it is referred to as anti-windup (AW). We consider two cases: set point tracking and disturbance rejection. For set point tracking and disturbance rejection, the fuzzy compensator shows better performance than the conditioning technique. The presented control scheme is composed of a fuzzy logic based compensator and a conventional PID controller.

Keywords: Anti-Windup; Compensator; Saturation; Fuzzy; Disturbance.

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