Disturbance estimation and compensation in linear systems

Author

Profeta, Joseph A., III ; Vogt, William G. ; Mickle, Marlin H.

Author_Institution

Dept. of Electr. Eng., Pittsburgh Univ., PA, USA

Volume

26

Issue

2

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

225

Lastpage

231

Abstract

Discrete-time estimation and compensation are discussed as a solution to the problems encountered when disturbances are present and degrade the performance of continuous automatic control systems. The method described, under a mild set of conditions, allows the designer to locate the closed-loop system poles substantially anywhere and provide disturbance rejection as large as desired by increasing the dimensions of the disturbance estimator. This estimation/compensation scheme results in a gain characteristic, below some frequency (ω_c), with a slope of q×20 dB/decade. The value of q and ω_c can be chosen by the designer, within the physical limitations of the problem, so that the system error resulting from either deterministic or stochastic disturbances is sufficiently reduced. The method has been investigated for use with known linear, time-invariant systems

Keywords

closed loop systems; compensation; control system analysis; discrete time systems; linear systems; state estimation; automatic control systems; closed-loop system; compensation; deterministic disturbances; discrete time estimation; disturbance estimation; disturbance rejection; gain characteristic; linear systems; poles; stochastic disturbances; time-invariant systems; Automatic control; Control systems; Degradation; Frequency estimation; Frequency response; Linear systems; State estimation; Steady-state; Stochastic systems; Transfer functions;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.53455

Filename

53455