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Title:
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Upwind E-system upscaling and reliability EeFarm II calculations
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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28-3-2011
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ECN report number:
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Document type:
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ECN-E--10-068
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ECN publication
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Number of pages:
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Full text:
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56
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Download PDF
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Abstract:
Abstract: Trends in upscaling and reliability for electrical system of offshore wind farms
based on 5 and 20 MW turbines, wind farm sizes of 500 and 1000 MW and distances to shore
of 25, 100, 200 and 500 km have been investigated. The EeFarm-II program for wind farm
electrical and economic evaluation has been used for this investigation.
The EeFarm-II model calculates the output voltage and current phasor (AC) or voltage and
current value (DC) of each wind farm component based on the input voltage and current and
the component parameters. This is repeated for the complete operation range of the wind
farm, i.e. the range of input wind speed. Secondly, the total investment of the electrical
system (if wind turbine prices are not included) or of the wind farm (if wind turbine prices
are included) is determined. Based on the output power for each wind speed bin and the wind
speed distribution, the annual produced energy is determined. The final step is the calculation
of the Levelised Production Costs (LPC).
For the collection system in the wind farm 32kV and 69kV AC are taken into account, for
the connection to shore the options are 150kV AC, 245kV AC, 80kV DC and 150kV DC.
For the 500 MW wind farm with 5 MW turbines the 32kV option is marginally better. For
the 500MW wind farm at 25 km 150kV AC gives the lowest LPC. For 100, 200 and 500km,
150kV DC is the best solution.
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