Approximation of the disturbance dynamics by Extended State Observer Using an Artificial Delay

A disturbance estimator based on the design of an extended state observer (ESO) often considers that the time-derivative of the perturbation (or higher order time-derivatives) is very small and can be taken equal to zero in the observer design (standard extended system). In this paper, a better appr...

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Published inIFAC-PapersOnLine Vol. 53; no. 2; pp. 4768 - 4773
Main Authors Léchappé, V., Cirrincione, M., Han, Q.-L.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2020
Subjects
backward approximation
Extended state observer
time-delay
Extended state observer
time-delay
backward approximation
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Abstract A disturbance estimator based on the design of an extended state observer (ESO) often considers that the time-derivative of the perturbation (or higher order time-derivatives) is very small and can be taken equal to zero in the observer design (standard extended system). In this paper, a better approximation of the disturbance dynamics is proposed using a backward difference method. A new extended system is designed based on this approximation. Any observer that makes the error dynamics exponentially stable for the standard extended system can then be used to estimate the state of the new extended system. The efficiency of the method is illustrated through an example.
AbstractList A disturbance estimator based on the design of an extended state observer (ESO) often considers that the time-derivative of the perturbation (or higher order time-derivatives) is very small and can be taken equal to zero in the observer design (standard extended system). In this paper, a better approximation of the disturbance dynamics is proposed using a backward difference method. A new extended system is designed based on this approximation. Any observer that makes the error dynamics exponentially stable for the standard extended system can then be used to estimate the state of the new extended system. The efficiency of the method is illustrated through an example.
Author Léchappé, V.
Cirrincione, M.
Han, Q.-L.
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  surname: Han
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  organization: School of Software and Electrical Engineering, Swinburne University of Technology, Melbourne, Vic 3122, Australia
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Snippet A disturbance estimator based on the design of an extended state observer (ESO) often considers that the time-derivative of the perturbation (or higher order...
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SubjectTerms backward approximation
Extended state observer
time-delay
Title Approximation of the disturbance dynamics by Extended State Observer Using an Artificial Delay
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