Improvement of low-speed operation performance of DTC forthree-level inverter-fed induction motors
Kyo-Beum Lee
Joong-Ho Song
Choy, I.
Ji-Yoon Yoo
Dept. of Electr. Eng., Korea Univ., Seoul;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct 2001
Volume: 48,
Issue: 5
On page(s): 1006-1014
ISSN: 0278-0046
References Cited: 10
CODEN: ITIED6
INSPEC Accession Number: 7070161
Digital Object Identifier: 10.1109/41.954565
Current Version Published: 2002-08-07
Abstract
A direct torque control algorithm for three-level inverter-fed
induction motors is presented. Basic voltage selection methods similar
to a two-level inverter provoke some problems such as stator-flux
drooping phenomenon and undesirable torque control deterioration
appeared, especially at low-speed operation. To overcome these problems,
an algorithm with the basic switching sectors subdivided and
intermediate voltage vectors applied is proposed in this paper. This
algorithm basically considers applications in which direct
torque-controlled induction motors are fed by three-level inverters with
maximum switching frequency lowered around 1 kHz. An adaptive observer
is also employed to bring better responses at the low-speed operation,
by estimating some state variables and motor parameters which take a
deep effect on the performance of the low-speed operation. Simulation
and experiment results verify effectiveness of the proposed algorithm
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