Robust Compensation of Discrete-Time Plant Using 2-Periodic Controller

Abstract This paper investigates if periodic compensation can provide superior robustness to an unstable (discrete-time) LTI plant having non-minimum-phase zeros by virtue of its zero placement capability. A 2-periodic controller is proposed and a systematic 2-stage algorithm for placing not only the closed loop poles but also the loop-zeros at desired locations is presented. A comparison of this controller with an LTI one in respect of dead-beat control is also made.