Transcript LARSSON SE Session 2

Barcelona 12-15 May 2003
Connecting the London
underground to the public grid:
solutions for safeguarding of
power quality
R Grünbaum, M Noroozian, A Palesjö, ABB
Presented by T Larsson ABB
LARSSON SE Session 2 – Block 2
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Barcelona 12-15 May 2003
Background
• London Underground Ltd. (LUL) closing
down an old gas/oil power station from 1905
• LUL load, mostly diode converters, to be
connected to London Electricity public grid
• Power quality!
– Voltage fluctuations
– Harmonics
• Study!
LARSSON SE Session 2 – Block 2
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Barcelona 12-15 May 2003
Studies
• Voltage fluctuation study
– Traction load, big changes in power
– Find SVC sizes and verify their locations
• Harmonic distortion study
– Determine TCR and filter size (rating), number,
configuration and placement
• 5 different SVCs required
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Barcelona 12-15 May 2003
SVC Design
• TCRs and filters given by studies
• BCT thyristors and iron core reactors for space
saving and low magnetic fields (SVCs in residential
areas)
• Remote measurement of voltage
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Barcelona 12-15 May 2003
Conclusions
• Studies show that
– required voltage fluctuation will be met
– harmonic distortion will be within specification
• The SVCs and harmonic filters have been
installed and are in service
• Measurements show good agreement with
simulations
• Phasing the London Underground into the
public grid is complete
LARSSON SE Session 2 – Block 2
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