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On Cascading of the Series Loaded Resonant Converter
Alstom Power Serv.
Alstom Power Serv.
ABB.
2008 (English)In: 2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, IEEE , 2008, 3857-3860 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper a novel method for cascading H-bridge and resonant tanks in a SLR, series loaded resonant, converter is presented. The main focus is on load sharing. Different methods are discussed. Their robustness regarding variations in operating frequency, values of the components and parasitic elements are evaluated. The results are validated both by simulations and by experiments. For the experimental part a 120kW/70kV system has been designed and tested. The measurements confirm the simulations, where the proposed method shows an equal sharing of the load (current) even when operating the system close to resonance with a +/- 10% worst-case variation of the resonant tank components. The method is derived for two subsystems, but can be generalised to any number of subsystems. Thus, enabling the use of compact, standardised modules connected together forming very powerful systems.

Place, publisher, year, edition, pages
IEEE , 2008. 3857-3860 p.
Series
IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS, ISSN 0275-9306
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25168ISI: 000260398502157ISBN: 978-1-4244-1667-7 (print)OAI: oai:DiVA.org:kth-25168DiVA: diva2:356271
Conference
39th IEEE Power Electronic Specialists Conference (PESC 08) Rhodes, GREECE, JUN 15-19, 2008
Note
QC 20101012Available from: 2010-10-12 Created: 2010-10-12 Last updated: 2010-10-14Bibliographically approved
In thesis
1. Control and Design Aspects of Components and Systems in High-Voltage Converters for Industrial Applications
Open this publication in new window or tab >>Control and Design Aspects of Components and Systems in High-Voltage Converters for Industrial Applications
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High-frequency dc-dc converters are widely used in power electronic applications, both in consumer products and industrial products. By operating the converter at higher frequencies both a smaller size and better control characteristics can be obtained.

It is the objective of this work to investigate how high-frequency power converters can be optimized for high-voltage industrial applications. Specifically, power supplies for electrostatic precipitators (ESP) are considered. The work refers to operating frequencies higher than 20 kHz and load voltages reaching 100 kV and above. The power handling capability ranges from 10 to 200 kW.

High-frequency power supplies were originally introduced on the ESP market in 1993. An evaluation of the experiences gained during the first decade of operation is presented. It was found that the dust emissions have been reduced at the majority of the installations.

Efficiency aspects like IGBT losses in soft-switching operation with a sinusoidal collector current and the influence of different control methods have been analyzed. Dynamic properties of the IGBT such as: dynamic conduction losses and dynamic tail charges are presented and experimentally verified. The IGBT losses have been evaluated for LCC-converters operating above the resonance frequency. The losses have been measured and compared for different control methods and for different turn-off strategies, zero-current-switching and zero-voltage-switching, respectively. It is shown experimentally that the LCC-converter is more efficient than the series-loaded resonant converter for a range of values of the parallel capacitance. This is because the LCC-converter allows a lower turns ratio of the transformer.

The high-voltage high-frequency transformer has been analysed with respect to its parasitic elements. A method is presented, integrated rectification, which enables a sub-division of the winding capacitance into an AC-part and a DC-part. It is validated experimentally that they may be utilized as circuit elements and that the ratio of these capacitances may be varied within a wide range. This method is considered to be of importance when optimizing converters utilizing topologies where the output rectifier is followed by a capacitive filter.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. xii, 85 p.
Series
Trita-EE, ISSN 1653-5146 ; 2010:038
Keyword
High-voltage converter, resonant converter, high-voltage transformer, transformer parasitics, IGBT, soft-switching, control
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-25280 (URN)978-91-7415-757-4 (ISBN)
Public defence
2010-10-29, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20101014Available from: 2010-10-14 Created: 2010-10-14 Last updated: 2010-10-14Bibliographically approved

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