Compensation of Actuator’s Saturation by Using Fuzzy Logic and Imperialist Competitive Algorithm in a System with PID Controller

Subject Areas : Control systems

Abbas Ali Zamani ¹ ( MSc/ Isfahan University of Technology )
Seyed Mohammad Kargar Dehnavi ² ( MSc/Najafabad Branch, Islamic Azad, Tehran Branch )

Received: 2011-08-23 Accepted : 2012-05-21 Published : 2013-09-01

Keywords: PID Controller, Imperialist Competitive Algorithm, Actuator’s saturation, Fuzzy compensator,

Abstract :

Physical systems always include constraints and limits. Usually, the limits and constraints, in the control systems, are appeared as temperature and pressure limits or pumps capacity. One of the existing limits in the systems with PID controller is associated with the actuator’s saturation limits. With the saturating of the actuator, the controller’s output and plant’s input will be different and the output signal of controller do not lead the system and their states could not update correctly where this issue makes the system response undesirable. In this paper, by adding a fuzzy compensator that it’s parameters are tuned using imperialist competitive algorithm, the actuator saturation is prevented and the important parameters of the system response, such as setting time and overshoot, are improved.