Intersample Disturbance Response Design in a Dual-rate System Based on State-space Representation

Abstract

This paper proposes a new design method for controlling the dual-rate sampled-data control system, in which the sampling interval of a plant output is longer than the holding interval of a control input. In such a sampled-data control system, the continuous-time plant is controlled by the discrete-time controller using the sampled output, and hence the intersample response is designed as well as the sampled output response. In the proposed method, the dual-rate control system is extended independent of the discrete-time response. Furthermore, the intersample response for the disturbance is improve without changing the existing sampled response.