Design and analysis strategies for digital repetitive control systems with time-varying reference/disturbance period

This article analyses stability and performance features of different design schemes for digital repetitive control systems subject to references/disturbances that exhibit non-uniform frequency. Aiming at maintaining a constant value for the ratio T p /T s , T p being the period of the reference/dis...

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Bibliographic Details
Published in:International journal of control 2011-07, Vol.84 (7), p.1209-1222
Main Authors: Costa-Castelló, R., Olm, J.M., Ramos, G.A.
Format: Article
Language:English
Subjects:
aperiodic sampling
Applied sciences
Computer science
control theory
systems
Control system analysis
Control system synthesis
Control systems
Control theory. Systems
digital repetitive control
Exact sciences and technology
Modelling and identification
Studies
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Summary:This article analyses stability and performance features of different design schemes for digital repetitive control systems subject to references/disturbances that exhibit non-uniform frequency. Aiming at maintaining a constant value for the ratio T p /T s , T p being the period of the reference/disturbance signal and T s being the sampling period, two approaches are proposed. The first one deals with the real-time adaptation of T s to the actual changes of T p ; stability is studied by means of an LMI gridding method and also using robust control techniques. The second one propounds the introduction of an additional compensator that annihilates the effect of the time-varying sampling in the closed-loop system and forces its behaviour to coincide with that of an a priori selected nominal sampling period; the internal stability of the compensator-plant subsystem is checked by means of LMI gridding. The theoretical results are experimentally tested and compared through a mechatronic plant model.
ISSN:0020-7179
1366-5820
DOI:10.1080/00207179.2010.496871