Design and analysis of general rotor-flux-oriented vector controlsystems
Harnefors, L.
Dept. of Electron., Malardalen Univ., Vasteras ;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Apr 2001
Volume: 48,
Issue: 2
On page(s): 383-390
ISSN: 0278-0046
References Cited: 25
CODEN: ITIED6
INSPEC Accession Number: 6901632
Digital Object Identifier: 10.1109/41.915417
Current Version Published: 2002-08-07
Abstract
Reduced-order observers for rotor flux estimation of induction
motors are considered. The “current” model and
“voltage” model are obtained as special cases. It is shown
that the flux dynamics form a nonlinear closed-loop system when the flux
estimate is used for field orientation. The observer gain selection is
extremely critical for good behavior of this system. A framework is
developed, in which the properties of any gain selection can easily be
assessed. Four candidate gain selections are considered, two of which
yield schemes that do not use the rotor speed in their equations
(inherently sensorless schemes). It is also shown that for any gain
selection, an equivalent synchronous-frame implementation (i.e.,
indirect field orientation) always exists
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