Generalized Extended State Observer Based Control for Systems With Mismatched Uncertainties

The standard extended state observer based control (ESOBC) method is only applicable for a class of single-input-single-output essential-integral-chain systems with matched uncertainties. It is noticed that systems with nonintegral-chain form and mismatched uncertainties are more general and widely...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2012-12, Vol.59 (12), p.4792-4802
Main Authors: Li, Shihua, Yang, Jun, Chen, Wen-Hua, Chen, Xisong
Format: Article
Language:English
Subjects:
Control systems
Disturbance compensation gain
disturbance rejection
Disturbances
Effectiveness
Feedback control
Gain
Gain measurement
generalized extended state observer based control (GESOBC)
Mathematical models
MIMO
mismatched uncertainties
multi-input-multi-output (MIMO) system
nonintegral-chain system
Observers
Stability analysis
State observers
Uncertainty
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Summary:The standard extended state observer based control (ESOBC) method is only applicable for a class of single-input-single-output essential-integral-chain systems with matched uncertainties. It is noticed that systems with nonintegral-chain form and mismatched uncertainties are more general and widely exist in practical engineering systems, where the standard ESOBC method is no longer available. To this end, it is imperative to explore new ESOBC approach for these systems to extend its applicability. By appropriately choosing a disturbance compensation gain, a generalized ESOBC (GESOBC) method is proposed for nonintegral-chain systems subject to mismatched uncertainties without any coordinate transformations. The proposed method is able to extend to multi-input-multi-output systems with almost no modification. Both numerical and application design examples demonstrate the feasibility and efficacy of the proposed method.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2011.2182011