Table of Contents
Advances in Power Electronics
Volume 2012, Article ID 176876, 11 pages
Research Article

Using Averaged Modeling for Capacitors Voltages Observer in NPC Inverter

Power Electronics Group, Université de Sfax, ENIS-Sfax, BP. 1173, 3038 Sfax, Tunisia

Received 17 May 2012; Accepted 12 November 2012

Academic Editor: C. M. Liaw

Copyright © 2012 Bassem Omri et al. 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 developed an adaptive observer to estimate capacitors voltages of a three-level neutral-point-clamped (NPC) inverter. A robust estimated method using one parameter is proposed, which eliminates the voltages sensors. An averaged modeling of the inverter was used to develop the observer. This kind of modeling allows a good trade-off between simulation cost and precision. Circuit model of the inverter (implemented in Simpower Matlab simulator) associated to the observer algorithm was used to validate the proposed algorithm.