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Adil, M. (2009) HVDC Transmission System with Medium-Frequency Transformers. Göteborg : Chalmers University of Technology
BibTeX
@mastersthesis{
Adil2009,
author={Adil, Mohammed},
title={HVDC Transmission System with Medium-Frequency Transformers},
abstract={For voltage adaptation and galvanic isolation in High Voltage Direct Current (HVDC)
converter stations, standard transformers operating at grid frequency are currently
used. These devices tend to be very large and heavy, which is undesirable in many
applications. Transformers where the magnetic parts operate at a frequency
considerably higher than the grid frequency could offer many advantages. Smaller and
lighter transformers and lower losses are among them.
In this thesis, a future-oriented HVDC converter station using a medium frequency
MF transformer is studied with special focus on the converter circuits. The converter
size used in this work is 78MW (±75kVDC/11kVAC) and the main application is
power transmission to and from offshore installations. The converter consists of a
snubbered Voltage-Source Converter VSC and 2-phase by 3-phase cycloconverter
connected by a MF transformer. The VSC is implemented using a single phase leg
and the cycloconverter is implemented using fast thyristors. It is expected that the
semiconductor losses of the power conversion system will be significantly reduced by
the use of the proposed converter topology which permits soft switching of all
semiconductor valves in all operating points without any auxiliary valve.
The thesis evaluates the commercial potential of the proposed HVDC system. A
general circuit design based on available preconditions is made first for the studied
converter station, and then a comparison with an existing two-level HVDC-Light
station with regard to semiconductor requirements and losses is performed for the
same operating point. The total space occupied by the valve installations for both
systems is also estimated. The comparison shows that the proposed system promises a
considerable reduction in the number of semiconductor devices and, as a result, the
total volume of the converter valves. However, the semiconductor losses increase
slightly.},
publisher={Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola},
place={Göteborg},
year={2009},
keywords={Medium frequency MF transformer HVDC system, Mutually commutated},
note={55},
}
RefWorks
RT Generic
SR Electronic
ID 105125
A1 Adil, Mohammed
T1 HVDC Transmission System with Medium-Frequency Transformers
YR 2009
AB For voltage adaptation and galvanic isolation in High Voltage Direct Current (HVDC)
converter stations, standard transformers operating at grid frequency are currently
used. These devices tend to be very large and heavy, which is undesirable in many
applications. Transformers where the magnetic parts operate at a frequency
considerably higher than the grid frequency could offer many advantages. Smaller and
lighter transformers and lower losses are among them.
In this thesis, a future-oriented HVDC converter station using a medium frequency
MF transformer is studied with special focus on the converter circuits. The converter
size used in this work is 78MW (±75kVDC/11kVAC) and the main application is
power transmission to and from offshore installations. The converter consists of a
snubbered Voltage-Source Converter VSC and 2-phase by 3-phase cycloconverter
connected by a MF transformer. The VSC is implemented using a single phase leg
and the cycloconverter is implemented using fast thyristors. It is expected that the
semiconductor losses of the power conversion system will be significantly reduced by
the use of the proposed converter topology which permits soft switching of all
semiconductor valves in all operating points without any auxiliary valve.
The thesis evaluates the commercial potential of the proposed HVDC system. A
general circuit design based on available preconditions is made first for the studied
converter station, and then a comparison with an existing two-level HVDC-Light
station with regard to semiconductor requirements and losses is performed for the
same operating point. The total space occupied by the valve installations for both
systems is also estimated. The comparison shows that the proposed system promises a
considerable reduction in the number of semiconductor devices and, as a result, the
total volume of the converter valves. However, the semiconductor losses increase
slightly.
PB Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola,
LA eng
LK http://webfiles.portal.chalmers.se/et/MSc/AdilMohammedMSc.pdf
LK http://publications.lib.chalmers.se/records/fulltext/105125/105125.pdf
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