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Power supply for an electric resistance melting furnace Alimadadi, Mehdi
Abstract
In recent years, the field of power electronics has experienced a large growth due to the confluence of several factors. Revolutionary advances in microelectronics methods have led to the development of controllers that include linear ICs and DSPs. Moreover, advances in semiconductor fabrication technology have made it possible to significantly improve the voltage/current handling capabilities and the switching speeds of power switches. This work is intended as a pilot 400kW unit for testing in the Advanced Material and Process Engineering Laboratory (AMPEL) building. The eventual goal of this project is to produce a full size commercial unit at 2.4MW. The conventional supply for an electric resistance-melting furnace consists of a singlephase low voltage source obtained from a 60Hz transformer. This high power single-phase load is becoming increasingly unacceptable to customers and a method of transforming the load into an effective balanced three-phase equivalent is sought. In single-phase sinusoidal loads the instantaneous power pulsates at twice the source frequency but the total instantaneous power drawn by a balanced three-phase load is constant. This implies that a substantial energy requirement must be present in any converter between the two systems or an unbalanced load to the three-phase source will be presented. Among the possible solutions, an AC/DC/AC conversion was chosen. A thyristor bridge rectifier is used as the AC/DC converter and a voltage source inverter is used as the DC/AC converter. Several previous papers have been reviewed to have a better idea on designing the DCbus filter, the effect of non-sinusoidal voltage/current on the transformers, etc. Practical considerations were one the most important factors in the design and choosing of the elements.
Item Metadata
Title |
Power supply for an electric resistance melting furnace
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2000
|
Description |
In recent years, the field of power electronics has experienced a large growth due to the
confluence of several factors. Revolutionary advances in microelectronics methods have led to
the development of controllers that include linear ICs and DSPs. Moreover, advances in
semiconductor fabrication technology have made it possible to significantly improve the
voltage/current handling capabilities and the switching speeds of power switches.
This work is intended as a pilot 400kW unit for testing in the Advanced Material and
Process Engineering Laboratory (AMPEL) building. The eventual goal of this project is to
produce a full size commercial unit at 2.4MW.
The conventional supply for an electric resistance-melting furnace consists of a singlephase
low voltage source obtained from a 60Hz transformer. This high power single-phase
load is becoming increasingly unacceptable to customers and a method of transforming the load
into an effective balanced three-phase equivalent is sought. In single-phase sinusoidal loads the
instantaneous power pulsates at twice the source frequency but the total instantaneous power
drawn by a balanced three-phase load is constant. This implies that a substantial energy
requirement must be present in any converter between the two systems or an unbalanced load
to the three-phase source will be presented. Among the possible solutions, an AC/DC/AC
conversion was chosen. A thyristor bridge rectifier is used as the AC/DC converter and a
voltage source inverter is used as the DC/AC converter.
Several previous papers have been reviewed to have a better idea on designing the DCbus
filter, the effect of non-sinusoidal voltage/current on the transformers, etc. Practical
considerations were one the most important factors in the design and choosing of the elements.
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Extent |
6033066 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-09
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065295
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2000-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.