Adaptive Control Schemes for Improving the Control System Dynamics: A Review

Adaptive control involves modifying the control law used by the controller to cope with the fact that the parameters of the system being controlled change drastically owing to change in environmental conditions or in the system itself. The adaptive control process continuously and automatically measures the dynamic behaviour of plant, compares it with the desired output and uses the difference to vary adjustable system parameters or to generate an actuating signal in such a way that optimal performance can be maintained regardless of system changes. This paper deals with the application of different adaptive schemes in the control system and provides a detailed comparison between the schemes on the basis of their approach to deal with the control problem. A comparative analysis is presented to show the effectiveness of adaptive control techniques during transients in the area of power quality improvement with a shunt active power filter. A classified list of more than 90 publications on this topic is also given for quick reference.