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For model-based control design, closed-loop identification gives better performance
KTH, Superseded Departments, Signals, Sensors and Systems. (Reglerteknik)ORCID iD: 0000-0002-9368-3079
Université Catholique de Louvain.
Université Catholique de Louvain.
1996 (English)In: Automatica, ISSN 00051098 (ISSN), Vol. 32, no 12, 1659-1673 p.Article in journal (Refereed) Published
Abstract [en]

We compare open loop versus closed loop identification when the identified model is used for control design, and when the system itself belongs to the model class, so that only variance errors are relevant. Our measure of controller performance (which is used as our design criterion for identification) is the variance of the error between the output of the ideal closed loop system (with the ideal controller) and that of the actual closed loop system (with the controller computed from the identified model). Under those conditions, we show that, when the controller is a smooth function of the input-output dynamics and the disturbance spectrum, the best controller performance is achieved by performing the identification in closed loop with an operating controller that we characterize. For minimum variance and model reference control design cirteria, we show that this 'optimal operating controller for identification' is the ideal controller. This then leads to a suboptimal but feasible iterative scheme. Copyright © 1996 Elsevier Science Ltd.

Place, publisher, year, edition, pages
1996. Vol. 32, no 12, 1659-1673 p.
Keyword [en]
Closed-loop identification, Experiment design, Identification for control, Closed loop control systems, Control system synthesis, Dynamics, Errors, Mathematical models, Optimal control systems, Performance, Closed loop identification, Model based control design, Identification (control systems)
National Category
Control Engineering
Research subject
URN: urn:nbn:se:kth:diva-60586DOI: 10.1016/S0005-1098(96)80003-3OAI: diva2:477558

NR 20140805

Available from: 2012-01-13 Created: 2012-01-13 Last updated: 2015-11-11Bibliographically approved

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Hjalmarsson, Håkan
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