Z(TN)-Observability and control of parallel multicell chopper using Petri nets

This study deals with observability problems and control of the parallel multicell chopper. In the area of strong currents with high switching frequencies, new structures based on the combination of components have been developed. Among them, the authors find the parallel multicell converters that t...

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Bibliographic Details
Published in:IET power electronics 2013-04, Vol.6 (4), p.710-720
Main Authors: Amghar, Bilal, Darcherif, Abdelmoumen, Barbot, Jean-Pierre
Format: Article
Language:English
Subjects:
Automatic Control Engineering
Choppers
choppers (circuits)
Computer Science
Control
Converters
DC‐DC power convertors
DC‐DC static power converter
Direct current
dynamical equations
Electric potential
Engineering Sciences
load variation
observability
observability problems
parallel multicell chopper
Petri nets
Power converters
switching cells
switching convertors
Voltage
voltage control
voltage output regulation
Z(TN) observability
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Summary:This study deals with observability problems and control of the parallel multicell chopper. In the area of strong currents with high switching frequencies, new structures based on the combination of components have been developed. Among them, the authors find the parallel multicell converters that the authors studied in this study. This type of choppers is a DC/DC static power converter which has an output current equals to n (n is the number of cells) times the source current. After recalling the dynamical equations of the converter, its hybrid dynamical behaviour and properties are highlighted. This particular hybrid system induces new and difficult observability problems, such problem can be tackled by a new observability concept [the Z(TN)-observability]. However, for a large number of switching cells in parallel, the complexity of the system makes it impossible to predict the transient behaviour of the converter and therefore all predimensioning. The main disadvantage of this type of converter is the imbalance branches of current with increasing number of cells. Therefore modelling and control with Petri net is proposed to solve the problems of imbalanced of currents and the voltage output regulation with variation of the load. The authors approaches are attested by several numerical simulations considering noisy measurements and load variations.
ISSN:1755-4535
1755-4543
1755-4543
1755-4535
DOI:10.1049/iet-pel.2012.0374