AN IMPROVED SLIDING MODE OBSERVER FOR SPEED SENSORLESS DIRECT TORQUE CONTROL OF PMSM DRIVE WITH A THREE-LEVEL NPC INVERTER BASED SPEED AND STATOR RESISTANCE ESTIMATOR.

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Published Dec 2, 2010
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Vol 10 No 4 (2010): Volume 10 / 2010

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A.AMEUR A.AMEUR
Materials Laboratory, Electrical Engineering Department, Laghouat University, BP 37G, Ghardaia Street, Laghouat (03000), Algeria
B. MOKHTARI
Materials Laboratory, Electrical Engineering Department, Laghouat University, BP 37G, Ghardaia Street, Laghouat (03000), Algeria
L. MOKRANI ,
Materials Laboratory, Electrical Engineering Department, Laghouat University, BP 37G, Ghardaia Street, Laghouat (03000), Algeria
B. AZOUI ,
LEB Laboratory, Electrical Engineering Department, Batna University, Chahid M.E.H. Boukhlouf Street, Batna (05000), Algeria
N. ESSOUNBOULI,
Reims University, Center of Research in Science and Technologies of Information and Communication10026 Troyes CEDEX, France
A. HAMZAOUI
Reims University, Center of Research in Science and Technologies of Information and Communicat10026 Troyes CEDEX, Franceion

Abstract

This paper presents a novel sensorless Direct Torque Control (DTC) methods for permanent magnet synchronous motors (PMSM) supplied by three-level Neutral-Point-Clamped NPC) inverter based on the sliding mode observe (SMO). The stability is verified by Lyapunov theory. The SMO is utilized to compensate the effects of parameter variation on the stator reisistance, which make flux and torque estimation more accurate and insensitive to parameter variation.
In classical DTC, due to the hysteresis based scheme, the switching frequency is variable, current distortion and torque ripple are more important. In order to obtain a constant switching frequency and hence torque ripple minimization, we introduces a new control technique for PMSM using a three-level NPC inverter
. Simulation results are presented and show the effectiveness of the proposed method.

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