ECN publication
Upwind E-system upscaling and reliability EeFarm II calculations
Published by: Publication date:
ECN Wind Energy 28-3-2011
ECN report number: Document type:
ECN-E--10-068 ECN publication
Number of pages: Full text:
56 Download PDF  

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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