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Title:
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More power and less loads in wind farms:
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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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1-11-2004
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ECN report number:
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Document type:
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ECN-RX--04-122
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Conference Paper
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Number of pages:
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Full text:
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12
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Download PDF
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Presented at: European Wind Energy Conference 2004, London, UK, 22-25 november 2004.
Abstract:
We consider a farm as a single energy extracting body instead of a superposition
of individual energy extractors i.e. wind turbines. As a result we found
two new hypotheses called Heat and Flux. Both hypotheses reveal that
the classical operation of turbines in a wind farm at the Lanchester-Betz
optimum does not lead to maximum farm output. However, when the turbines
at the windward side of the farm are operated below their optimum, then
the power of the turbines under the lee increases in such a way that
the net farm production increases slightly. Next to this production
advantage of Heat and Flux operation there is also a loading advantage.
The average axial loading of the upwind turbines of a farm is reduced
in a ?Heat and Flux?-farm. As a result those turbines generate less
turbines so that the fatigue loads of the downwind turbines reduce too.
The results were confirmed by in a boundary layer tunnel by means of
differential measurements between a ?Heat and Flux?-farm and a classical
farm.
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