
Saunder January 22, 2014 10:43 K15053˙Book
8 Disturbance Observer-Based Control: Methods and Applications
It is concluded from both (1.7) and (1.9) that proportional control can not
completely remove the effects caused by disturbance (even a constant one) from
the systems. In the presence of disturbance, to maintain a smaller tracking offset,
a higher control gain k has to be designed to suppress the disturbance. This is the
potential philosophy for high-gain control to reject the disturbances. Actually,
this is the reason why many advanced feedback-control methods, such as H
∞
control and robust control, have been employed for disturbance rejection. ...