Complete Stability of Reduced-Order and Full-Order Observers for Sensorless IM Drives
Harnefors, L.
Hinkkanen, M.
ABB, Ludvika;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: March 2008
Volume: 55,
Issue: 3
On page(s): 1319-1329
ISSN: 0278-0046
INSPEC Accession Number: 9897235
Digital Object Identifier: 10.1109/TIE.2007.909077
Current Version Published: 2008-03-03
Abstract
In this paper, reduced-order observers for flux and speed estimation of sensorless induction-motor drives are analyzed. All gain selections, which give stability for all operating conditions, including the regeneration mode (called complete stability), are found. Furthermore, it is shown that full-order observers, under the assumption of fast stator-current dynamics, have equivalent implementations as reduced-order observers. Consequently, all gain selections of the full-order observer gains for which complete stability is obtained, under the assumption stated, are also found. A number of previously proposed full-order observers are analyzed within the developed framework, generally showing agreement between the full- and reduced-order models.
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