Article : [ART382]

Titre : A ZVS imbricated cell multilevel inverter with auxiliary resonant commutated poles

Cité dans :[REVUE391] IEEE Transactions on Power Electronics, Volume 17, Issue 6, November 2002.

Adresse : Lab. d'Electrotechnique et d'Electronique Industrielle, CNRS, Toulouse;
Lien : private/Turpin1.pdf - 9 pages, ko.
Source : This paper appears in: Power Electronics, IEEE Transactions on
Pages : 874 - 882
Volume : 17
Issue : 6
Date : Nov 2002
ISSN : 0885-8993
INSPEC_Accession_Number: 7497916

Abstract :
The imbricated-cell multilevel converter is well suited to high
power applications. It allows the series connection of n switches
with natural voltage sharing between these switches enabled through
the connection of n-1 flying capacitors. This paper deals with the
application of soft-switching on this topology; to date, only the
hard-switching mode has been studied. The use of soft switching
enables an increase of the switching frequency (resulting in the
size reduction of the flying capacitors) without a decrease of the
converter efficiency. Of the soft switching methods considered, the
Auxiliary Resonant Commutated Pole (ARCP) technique was chosen due
to the relative ease in which it can be incorporated into the
converter topology. Furthermore, this technique offers numerous
advantages: loss reduction, no added stress to the switches and
compatibility with PWM control. The main properties of the ARCP
multicell converter are the same as the hard-switched topology: an
increase of the apparent output switching frequency and natural
self-balancing of the flying-capacitor voltages. This paper presents
the results of both simulations performed and measurements taken
from an experimental set-up in order to study the viable system
functioning. The introduction of soft-switching strongly complicates
the theoretical study of the balancing mechanisms, however. As a
result, the authors depend on simulations to validate the natural
balancing effect during soft switching. Lastly, a general method of
loss measurement is presented. Results show that the converter
losses are reduced by at least 30%.

Index Terms:
capacitors commutation switching convertors PWM control ZVS
imbricated-cell multilevel converter auxiliary resonant commutated
poles flying capacitors loss reduction natural self-balancing
natural voltage sharing soft-switching switching frequency
zero voltage switching

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