Extension of Dual-rate Control System Independent of Discrete-time Reference/disturbance Response

Abstract

This paper discusses a design method for dual-rate systems, in which the sampling interval of the plant output is an integer multiple of the holding interval of the control input. In such dual-rate systems, even if the sampled output follows the reference input the intersample output might vibrate because of the disturbance. In this paper, a new design method is proposed so that a dual-rate control law is extended independent of the disturbance response as well as the reference response in discrete time.