H2 control and filtering of discrete-time LPV systems exploring statistical information of the time-varying parameters

This paper introduces a new strategy to improve performance in gain-scheduled control and filtering for LPV systems exploiting statistical information about the time-varying parameters whenever available. The novelty of the technique, named sub-domain optimization heuristic (SDOH), is to design cont...

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Bibliographic Details
Published in:Journal of the Franklin Institute 2020-04, Vol.357 (6), p.3835-3864
Main Authors: Palma, Jonathan M., Morais, Cecília F., Oliveira, Ricardo C.L.F.
Format: Article
Language:English
Subjects:
Control stability
Control systems
Design optimization
Discrete time systems
Domains
Filtering systems
Filtration
Heuristic
Parameters
Performance enhancement
Robustness (mathematics)
Statistical analysis
Statistics
Uncertainty
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Summary:This paper introduces a new strategy to improve performance in gain-scheduled control and filtering for LPV systems exploiting statistical information about the time-varying parameters whenever available. The novelty of the technique, named sub-domain optimization heuristic (SDOH), is to design controllers or filters treating robust stability independently of performance. The performance is optimized only in a sub-domain of the time-varying parameters, where a higher frequency of occurrence is expected, while the robust stability is certificated for the whole domain. The problem of gain-scheduled design subject to inexact measurements is discussed in details as main motivation but any other feedback or filter strategy for LPV systems were statistical information about the time-varying parameters is known can be handled in a similar way. Still in the context of inexact measurements, a more complete modeling for the additive uncertainty is given, generalizing previous results from the literature for two types of uncertainties, polytopic and affine. A new design condition for H2 full-order LPV filtering is also given as contribution. Several numerical examples are presented to illustrate the results.
ISSN:0016-0032
1879-2693
0016-0032
DOI:10.1016/j.jfranklin.2020.02.029