Equivalent-input-disturbance controller design using a general structured state observer

This paper presents a design method to reject disturbances for a linear time-invariant system based on the concept of equivalent input disturbance. A full-order general structured state observer is employed in the control system structure to estimate an equivalent input disturbance, and the pole assignment algorithm and a linear quadratic method are used to design the general structured state observer. The simulations of a rotational speed control system are given to demonstrate the validity of the proposed method.