DocumentCode :
1021483
Title :
Nonlinear uncertainty observer for AC motor control using the radial basis function networks
Author :
Huh, S.-H. ; Park, J.-H. ; Choy, I. ; Park, G.-T.
Author_Institution :
Sch. of Electr. Eng., Korea Univ., Seoul, South Korea
Volume :
151
Issue :
3
fYear :
2004
fDate :
5/23/2004 12:00:00 AM
Firstpage :
369
Lastpage :
375
Abstract :
Some kinds of speed control loops can be easily designed based on simple mechanical dynamics by using reasonable assumptions in AC motor control systems. However, these simple approaches give undesired performances under mismatches of model parameters, external load conditions and unknown dynamics. Moreover, in real systems as well as during analysis, speed estimation error is inevitable and should be considered from the viewpoint of the stability of the whole feedback control system. To cope with the robust characteristics under inherent uncertainties, a nonlinear uncertainty observer using the radial basis function networks (RBFNs) is proposed. A control law for stabilising the system and adaptive laws for updating both weights in the RBFNs and a bounding constant are established, so that the whole closed-loop system is stable in the sense of Lyapunov. Additionally, stability proof of the whole control system including the speed estimation error is presented. The proposed approach is applied to a three-level inverter-fed induction motor direct torque control (DTC) system, and computer simulations as well as experimental results are presented to show the validity and effectiveness of the proposed system.
Keywords :
AC motors; Lyapunov methods; angular velocity control; closed loop systems; control engineering computing; feedback; machine control; nonlinear control systems; observers; radial basis function networks; stability; AC motor control; Lyapunov stability; closed-loop system; feedback control system; nonlinear uncertainty observer; radial basis function networks; speed control loops; speed estimation error; three-level inverter-fed induction motor direct torque control system;
fLanguage :
English
Journal_Title :
Control Theory and Applications, IEE Proceedings
Publisher :
iet
ISSN :
1350-2379
Type :
jour
DOI :
10.1049/ip-cta:20040482
Filename :
1309329
Link To Document :
بازگشت