Digital Repetitive Control under Nonuniform Sampling : An LMI Stability Analysis

Abstract EN

Digital repetitive control is a technique which allows tracking periodic references and/or rejecting periodic disturbances.

Repetitive controllers are usually designed assuming a fixed fundamental frequency for the signals to be tracked/rejected and its main drawback being a dramatic performance decay when this frequency varies.

A usual approach to overcome the problem consists of an adaptive change of the sampling period according to the reference/disturbance period variation.

This paper presents a stability analysis of a digital repetitive controller working under time-varying sampling period by means of an LMI gridding approach.

Theoretical developments are illustrated with experimental results, which are preceded by a detailed description of fundamental issues related to the implementation procedure.