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Research Letters in Electronics
Volume 2009, Article ID 215782, 4 pages
Research Letter

Disturbance Observer-Based Simple Nonlinearity Compensation for Matrix Converter Drives

1School of Electrical and Computer Engineering, Ajou University, Suwon 443-749, South Korea
2Institute of Energy Technology, Aalborg University, 9100 Aalborg, Denmark

Received 23 July 2008; Accepted 22 October 2008

Academic Editor: Henry S. H. Chung

Copyright © 2009 Kyo-Beum Lee and Frede Blaabjerg. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a new method to compensate the nonlinearity for matrix converter drives using disturbance observer. The nonlinearity of matrix converter drives such as commutation delay, turn-on and turn-off time of switching device, and on-state switching device voltage drop is modeled by disturbance observer and compensated. The proposed method does not need any additional hardware and offline experimental measurements. The proposed compensation method is applied for high-performance induction motor drives using a 3 kW matrix converter system without a speed sensor. Simulation and experimental results show that the proposed method using disturbance observer provides good compensating characteristics.