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Adaptive control design under structured model information limitation: A cost-biased maximum-likelihood approach
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0001-9940-5929
2015 (English)In: Systems & control letters (Print), ISSN 0167-6911, E-ISSN 1872-7956, Vol. 75, 8-13 p.Article in journal (Refereed) Published
Abstract [en]

Networked control strategies based on limited information about the plant model usually result in worse closed-loop performance than optimal centralized control with full plant model information. Recently, this fact has been established by utilizing the concept of competitive ratio, which is defined as the worst-case ratio of the cost of a control design with limited model information to the cost of the optimal control design with full model information. We show that an adaptive controller, inspired by a controller proposed by Campi and Kumar, with limited plant model information, asymptotically achieves the closed-loop performance of the optimal centralized controller with full model information for almost any plant. Therefore, there exists, at least, one adaptive control design strategy with limited plant model information that can achieve a competitive ratio equal to one. The plant model considered in the paper belongs to a compact set of stochastic linear time-invariant systems and the closed-loop performance measure is the ergodic mean of a quadratic function of the state and control input.

Place, publisher, year, edition, pages
2015. Vol. 75, 8-13 p.
Keyword [en]
Interconnected systems, Adaptive control, Optimal control, Structural constraints
National Category
Control Engineering
URN: urn:nbn:se:kth:diva-160763DOI: 10.1016/j.sysconle.2014.10.010ISI: 000348089500002ScopusID: 2-s2.0-84911937986OAI: diva2:791648
Swedish Research CouncilKnut and Alice Wallenberg Foundation

QC 20150302

Available from: 2015-03-02 Created: 2015-02-27 Last updated: 2015-03-02Bibliographically approved

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Farokhi, FarhadJohansson, Karl H.
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