Disturbance suppression of linear time-invariant systems based on disturbance estimator

This paper investigates the disturbance suppression of linear time-invariant (LTI) systems with periodically or unbounded exponentially increasing external disturbance by the disturbance estimator (DE)-based control method. Firstly, some suitable filters are proposed to realize the asymptotic estimation of periodically or exponentially increasing disturbance. Then, the DE-based controllers are designed to realize the asymptotical stabilization of such systems by suppressing those disturbances. Finally, numerical examples with computer simulation verify the effectiveness and correctness of the proposed results.