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Title:
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EWTW Meteorological database, Description June 2003 - May 2005
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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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1-6-2005
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ECN report number:
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Document type:
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ECN-I--05-007
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Other
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Number of pages:
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Full text:
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46
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Download PDF
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Abstract:
The ECN Wind Turbine Test Station Wieringermeer (EWTW) is
a test location for wind turbines that comprises of four prototype turbines,
five research N80 turbines and three large meteorological masts. Two
masts reach to 108m height and one mast to 100m. Several research projects
have been carried out at the EWTW during the first two years. For each
project, a database is created in order to separate confidential turbine
data. As a result, the meteorological data are scattered over several
databases. The set-up of the EWTW meteorology database (EWTWM) is such
that all meteorological data measured during the projects at EWTW are
stored in a single database. This database does not contain confidential
data.
Since there is not a specific project for the definition
of the EWTWM database, it must be stipulated that only data measured
in operational projects are stored. If signals are not measured in these
projects and the instruments are removed, the EWTWM database cannot
provide for further extension of the measurements. As a result, the
EWTWM database consists of a patchwork of measurements that are valuable
when properly described. Storage of the meteorological data is done
using the WDMS database structure. This structure has been developed
by ECN and is used for the storage of the large data sets measured at
wind turbine measurement projects. With this structure, the data are
easily accessible. The data are stored with a sample frequency of 4
Hz together with the 10-minute statistics (average, minimum, maximum
and standard deviation). This means that some data have been resampled.
The first meteorological mast at EWTW is installed in March
2003 and is operational since June 2003. In this report an overview
of the data in the EWTWM database is presented. A site description is
given and also the meteorological mast and the instrumentation and data
acquisition system are specified. The second meteorological mast is
erected in July 2004 and data are included in the EWTWM database since
December 2004. In addition experiments are done with a 25m high mast
next to the meteorological mast 1 in order to characterise the flow
distortion around the mast. These data are also included in the EWTWM
database.
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