Vol.7, No 1, 2008 pp. 121 - 129
UDC 681.51
ON ERROR-SIGNAL BASED DESIGN OF DIGITAL
MINIMUM VARIANCE CONTROL WITH FUZZY-SLIDING MODE
Darko Mitić, Dragan Antić, Marko Milojković
Department of Automatic Control, University of Niš, Faculty of Electronic
Engineering, Aleksandra Medvedeva 14, 18000 Nis, Serbia
E-Mail: darko.mitic@elfak.ni.ac.yu,
milojkovic@elfak.ni.ac.yu,
dantic@elfak.ni.ac.yu
Abstract. This paper deals with a design of input/output based
digital fuzzy sliding mode control concept where no information on a reference
input signal is available (only error signal is measurable). The control
approach is based on minimum variance control method with disturbance estimator.
An additional filtration of nonlinear, fuzzy, control component is performed
by using a digital integrator and, consequently, elimination of chattering
and higher accuracy in steady-state are achieved in comparison to the existing
solution.
Key Words: Fuzzy sliding mode, Minimum variance, Chattering
free
PROJEKTOVANJE DIGITALNOG UPRAVLJANJA MINIMALNE
VARIJANSE
S FAZI-KLIZNIM REŽIMOM ZASNOVANO NA SIGNALU GREŠKE
Ovaj rad bavi se digitalnim upravljanjem s fazi-kliznim režimom zasnovanim
na modelu ulaz-izlaz gde ne postoji informacija o referentnom ulaznom signalu
(može se meriti samo signal greške). Predloženi prilaz u upravljanju
bazira se na metodi upravljanja minimalna varijansa sa estimatorom poremećaja.
Dodatno filtriranje nelinearne, fazi komponente, izvedeno je korišćenjem
digitalnog integratora i, shodno tome, postignuta je eliminacija četeringa
i veća preciznost sistema u ustaljenom stanju u odnosu na postojeća rešenja.
Ključne reči: Fazi-klizni režim, Minimalna varijansa, Ublažavanje
četeringa
