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- Title
Estimation and rejection of sinusoidal disturbance with unknown frequency using cascade disturbance observer.
- Authors
Xinyu, Wen; Junjie, Zhang; Xiuming, Yao
- Abstract
A disturbance rejection approach is presented for a class of uncertain systems subject to sinusoidal disturbance with unknown frequency. The proposed disturbance estimation method includes two types of observers that are connected in cascade form. The disturbance property is excited through an auxiliary filter, and then a frequency factor observer is constructed to generate the information required by full-order state observer. Thus, with the disturbance and system state estimation values, the composite control structure including a cascade disturbance observer (CDO) and a robust feedback controller is designed. As a result, the uncertain system with unknown-frequency sinusoidal component can be controlled within the disturbance observer-based control (DOBC) framework, where the asymptotic stability performance can be guaranteed.
- Subjects
UNCERTAIN systems; COMPOSITE structures; PSYCHOLOGICAL feedback
- Publication
Transactions of the Institute of Measurement & Control, 2021, Vol 43, Issue 12, p2647
- ISSN
0142-3312
- Publication type
Article
- DOI
10.1177/01423312211002799