AUTOMATIC GAIN CONTROL FOR UNITY FEEDBACK CONTROL SYSTEMS

Abstract

In this paper, an automatic gain control scheme is proposed for analyses and designs of unity feedback control systems. It is consisted of a fast command tracking loop and a slow gain adaptive loop. The overall system is equivalent to a conventional automatic gain control loop with command tracking error input. It gives good command tracking behaviour while keeping robust characteristic of the original automatic gain control loop. It gives good robustness for coping with fast large parameter and load disturbance variations also. The stability of the controlled systems and effective of the proposed method are verified by root-loci, time responses, frequency responses, large parameter variations and fast large load disturbances testing with two numerical examples.