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On experiences of the application of high-frequency power converters for ESP energisation
APSTOM Power Service.
APSTOM Power Service.
APSTOM Power Service.
AEP.
2004 (English)In: ICESP IX CONFERENCE, 2004Conference paper, Published paper (Other academic)
Abstract [en]

In order to improve Electrostatic Precipitator (ESP) efficiency and system cost a new technology for ESP power supplies, high-frequency power conversion, has been introduced.The first paper on commercial installations was presented about ten years ago (EPRI 1995, Toronto). Products based on this technology have been available on the market since 1993. With the first generation of products the applications were limited to small size ESPs. Through the years the scope has widened and today covers many processes. Still, the available power level limits the use on larger ESP bus sections.

The estimated number, world wide, of installed ESP power supplies based on high-frequency power conversion is close to 1000. This paper aims to evaluate the experiences, which have been gained  through these installations. Aspects such as ESP efficiency, cost and reliability are discussed.

Place, publisher, year, edition, pages
2004.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25279OAI: oai:DiVA.org:kth-25279DiVA: diva2:356924
Conference
The International Conference on Electrostatic Precipitation, Held in Kruger Gate, Mpumalanga, South Africa May May 17 - 21, 2004
Note
QC 20101014Available from: 2010-10-14 Created: 2010-10-14 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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