NDLI: A modified direct torque control using an adaptive flux observer

Content Provider	IEEE Xplore Digital Library
Author	Saberi, H. Sharifian, M.B.B.
Copyright Year	2012
Description	Author affiliation: Faculty of Electrical and Computer Engineering, University of Tabriz, Iran (Saberi, H.; Sharifian, M.B.B.)
Abstract	Direct torque control drive (DTC) is well-known due to its fast torque response, simplicity and robustness. But some difficulties arise during steady state and also low speed operation. Stator flux estimation is a crucial issue in a DTC drive, especially in low speed region. An open loop voltage model observer does not work properly due to existence of an open loop integrator and stator resistance variation. In this paper an adaptive flux observer is presented which has the advantage of removing the open loop integration and providing a mechanism to include stator resistance estimation. A precise estimation of stator resistance helps the system to have a desired performance in low speed region. Voltage drops over inverter switches normally had been ignored in voltage calculations, but in low speed region with low voltage values these voltage distortions should be considered. A non-linear inverter model is presented for modeling the voltage distortions. Also for eliminating torque, flux and current pulsations during steady state, instead of classical DTC method a combined DTC-SVM method is used. This method removes the pulsations while maintains the basic advantages of DTC drive.
Starting Page	1
Ending Page	7
File Size	1486576
Page Count	7
File Format	PDF
ISBN	9781467309318
ISSN	21603162
e-ISBN	9781467309349
DOI	10.1109/IICPE.2012.6450402
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-12-06
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	speed sensorless drive space vector modulation (SVM) Estimation Stators adaptive observer non-linear inverter model Frequency estimation Lyapunov theory Mathematical model Equations
Content Type	Text
Resource Type	Article

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