Title :
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
fDate :
3/1/1990 12:00:00 AM
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 (ωc ), with a slope of q×20 dB/decade. The value of q and ωc 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;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
