NDLI: Discrete-time Frequency-Locked-Loop filters for exact asymptotic rejection of sinusoidal disturbances

Content Provider	IEEE Xplore Digital Library
Author	Tedesco, F. Casavola, A. Fedele, G.
Copyright Year	2014
Description	Author affiliation: Dipt. di Ing. Inf., Modellistica, Elettron. e Sist. (DIMES), Univ. degli Studi della Calabria, Rende, Italy (Tedesco, F.; Casavola, A.; Fedele, G.)
Abstract	The paper proposes a discrete-time adaptive control scheme for the asymptotical rejection of unknown and possibly time-varying sinusoidal disturbances acting on a plant. The approach is based on a recently proposed discrete-time Frequency-Locked-Loop (FLL) nonlinear filter which is used in the scheme as an adaptive frequency tracker. The properties of the scheme are fully analyzed and it is shown that standard discretization techniques fail to provide discrete-time FLL filters that exhibit the same good properties of their continuous-time counterparts. In particular, unlike continuous-time FLL filters, biased estimates are usually produced by these discrete-time FLL filters and the corresponding rejection properties of the scheme are poor. In order to overcome this drawback, a Tustin discretization technique equipped with an adaptive pre-warping mechanism consisting of properly adjusting the pre-warping frequency on-line is shown to be sufficient to solve the problem and recover the rejection performance of the continuous-time schemes. Several final examples are provided for assessment purposes.
Starting Page	2285
Ending Page	2290
File Size	1114409
Page Count	6
File Format	PDF
ISBN	9781479932726
ISSN	07431619
e-ISBN	9781479932740
DOI	10.1109/ACC.2014.6858944
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Frequency estimation Frequency locked loops Resonant frequency Time-frequency analysis Convergence Estimation Difference equations Indirect adaptive control
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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