Robust state estimation and unknown inputs reconstruction for a class of nonlinear systems: multiobjective approach
2016 (Engelska)Ingår i: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 64, s. 1-7Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
We consider a novel method to design H-infinity observers for a class of uncertain nonlinear systems subject to unknown inputs. First, the main system dynamics are rewritten as an augmented system with state vector including both the state vector of the main system and the unknown inputs. Then, we design a H-infinity reduced-order observer to estimate both state variables and unknown inputs simultaneously. Based on a Lyapunov functional, we derive a sufficient condition for existence of the designed observer which requires solving a nonlinear matrix inequality. To facilitate the observer design, the achieved condition is formulated in terms of a set of linear matrix inequalities (LMI). By extending the proposed method to a multiobjective optimization problem, the maximum bound of the uncertainty and the minimum value of the disturbance attenuation level are found. Finally, the proposed observer is illustrated with an example.
Ort, förlag, år, upplaga, sidor
2016. Vol. 64, s. 1-7
Nyckelord [en]
H∞ observer design, Multiobjective optimization, Nonlinear systems, Unknown inputs reconstruction
Nationell ämneskategori
Reglerteknik
Forskningsämne
Reglerteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-3452DOI: 10.1016/j.automatica.2015.10.051ISI: 000368967000001Scopus ID: 2-s2.0-84951753244Lokalt ID: 14661358-2de9-42eb-87e4-fc5c24c5d160OAI: oai:DiVA.org:ltu-3452DiVA, id: diva2:976310
Anmärkning
Validerad; 2015; Nivå 2; 20151027 (salsay)
2016-09-292016-09-292022-08-23Bibliografiskt granskad