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					                                                                                                                                             ECN Wind Energy Facilities BV
Site specifications
                                                                                                                                             Schervenweg 35a

Wind turbines owned by test site                                                                                                             1771 RT Wieringerwerf

Number                       5                                                                                                               Tel   : +31 224 56 40 25

Type                         Nordex N80                                                                                                      Fax : +31 224 56 82 14

Rotor diameter               80 m                                                                                                            Mob. : +31 6 20 30 20 79

Hub height                   80 m                                                                                                            Contact: Wim Stam

Rated power                  2,5 MW                                                                                                

Erected in                   March 2004
Distance                     300 m
Prototype locations
Number                       4
Rotor diameter               max. 120 m (presently permitted value)
Hub height                   max. 100 m (presently permitted value)
Rated power                  up to 6 MW
Distance                     400 m

Electrical infrastructure                                                                                                                                            Kreileroord
Grid connection              at 10 kV level
Electrical grid capacity     36 MVA
Transformer station          10kV/50kV
Rated power per prototype    max. 6 MW                                                                                                                                                                                        Nordex N80
Meteo towers
                                                                                                                                                            10 kV cables                                                      wind turbines
Number                       3
Tower heights                108, 108 and 100 m
Measurement heights          various, at 25 to 108 m
Measured parameters          •    wind speed
                             •    wind direction                                                                                                                                                                              Control
                             •    air temperature                                                                                                                                                                             Center
                             •    air pressure
                                                                                                                                                           Meteo towers
Measurement infrastructure                                            The test site is managed by ECN Wind Energy Facilities
Signal cables                Glass fiber multiduct system             BV, a 100% ECN subsidiary. Many neighboring farmers                                                                                                                     ECN Wind Turbine Test Site Wieringermeer
Data acquisition             ECN DANTE systems                        participate in the project and receive financial benefits. The
Evaluation                   • in Control Center at the site          objective of this company on the one hand is to facilitate the                                                                                          Prototype
                             • at ECN via a direct glass fiber link
                                                                      measurement and development programs of ECN and on                                   50 kV station                                                      locations
Control Center
                                                                      the other hand to maintain financial integrity of the test site
Offices                      for manufacturers
Meeting room                 max. 10 persons
Computer room                for data evaluation
Miscellaneous                workshop and dressing room

Scaled Wind Farm
WInd turbines
Number                       10                                                                                                                                                                      Scaled Wind Farm
Type                         AIRCON P10

Rotor diameter               7,6 m
Hub height                   7,5 m
Rated power                  9,8 kW                                                                                                                                                             19 m met. masts
Erected in                   March 2008

Meteo masts

Number of small masts        10

Measurement height           7,5 m

Number of larger masts       4

Measurement heights          3,7 m; 7,5 m; 11,3 m and 18,9 m
                                                                                                                                                                                   Aircon turbines         7,5 m met. masts

From 2003 ECN has expanded its wind turbine facilities with a wind turbine test site in the municipality of Wieringermeer.                                                                                                                                                        Scaled Wind Farm
The site is located just south of the village Kreileroord, at about 30 km distance from ECN’s main offices in Petten. This
unique facility is a combination of a wind farm, prototype test locations and a scaled windfarm. The wind farm - consisting                                                                                                                                                       Background
of five Nordex N80 wind turbines - enables ECN to perform wind farm specific research and development programs. The                                                                                                                                                                 For the development of large (offshore) wind farms it is es-
site also comprises four prototype locations. These locations enable manufacturers to test, optimize and certify prototypes                                                                                                                                                       sential to understand the detailed wind field in and around
together with ECN. Supporting facilities are three meteo towers, a 36 MVA grid connection, data collection equipment and a                                                                                                                                                        the farm. The wake effect of individual turbines have a
test site control center. The test site also accommodates a unique facility, which allows ECN to perform accurate wind field                                                                                                                                                       strong influence on energy production and mechanical
measurements in a small scale wind farm. This Scaled Wind Farm - consisting of ten Aircon P10 turbines plus fifteen                                                                                                                                                                loads of other turbines. Understanding these influences is
measurement towers - also allows for the development and testing of wind farm specific control strategies. The site has a                                                                                                                                                          necessary to carry out aerodynamic research programs
favorable wind climate: the average wind speed at 100 m height is 8,3 m/s.                                                                                                                                                                                                        and to develop optimised wind farm control strategies.
                                                                                                                                                                                                                                                                                  Reliable computer models are required that predict the
                                                                                                                                                                                                                                                                                  steady and unsteady wind flows in wind farms and the re-
                                                                                                                                                                                                                                                                                  sponse of individual wind turbines. For the development of
                                                                                                                                                                                                                                                                                  these models adequate measurements are crucial. These
                                                                                                                                                                                                                                                                                  measurements are not available yet. The main reason for
Wind turbines owned by the test site                                                                                                                                                                                                                                              that is that accurate flow determination requires many
The five Nordex N80 turbines were installed early 2004                                                                                                                                                                                                                             metrological towers. For full scale measurement this would
and produce about 30.000.000 kWh per year. The income                                                                                                                                                                                                                             be far too expensive. Therefore accurate wind flow mea-
of this green electricity gives a solid base for the financial                                                                                                                                                                                                                     surements in wind farms are lacking. This has hindered
exploitation of the site. The turbines are used by ECN for                                                                                                                                                                                                                        research on wind farm aerodynamics and control.
its R&D programs. These programs cannot be executed                                                                                                                                                                                                                                                                                                of 7.5 m. The scaled farm has been designed in a way that
in commercial farms. Wind farm operators are reluctant                                                                                                                                                                                                                            The value of wind tunnel data as an alternative for full scale   allows ECN to perform experiments without any risk for the
to facilitate research programs that might conflict with                                                                                                                                                                                                                           measurements is limited due to scaling effects.                  environment as well as for the turbines themselves. Inside
maximum energy production. ECN investigates aspects                                                                                                                                                                                                                               ECN has overcome these problems by building a scaled             and around the wind farm a network of fourteen meteoro-
like operation and maintenance strategies; wake effects,                                                                                                                                                                                                                          wind farm facility. Its scale is large enough to alleviate the   logical masts has been installed, which measure the wind
and condition monitoring. Other important activities are the                                                                                                                                                                                                                      dominant scaling effects and the scale is sufficiently small      velocity field from 3.6 m to 19 m height. This covers the
development of improved wind farm control strategies and                                                                                                                                                                                                                          to permit the building of sufficient meteorological masts.        rotor area and up to one rotor diameter above the rotor.
new advanced measurement techniques.                                                                                                                                                                                                                                                                                                               The alignment of turbines and measurement masts within
                                                                                                                                                                                                                                                                                  Scaled Wind Farm layout                                          the wind farm permits to measure at the same time single,
Measurement infrastructure                                       is capable of measuring almost every wind turbine related                                                                                                                                                        The scaled farm consists of ten permanent magnet, direct         double, triple and quadruple wakes. This is supported by
An advanced glass fibre based data acquisition system             signal. Three meteo towers allow for IEC- and MEASNET-                                                                                                                                                           drive, pitch controlled wind turbines, to which hardware         simultaneously measuring the external conditions with the
supports manufacturers in testing, optimisation and cer-         compatible measurements. ECN is accredited to perform                                                                                                                                                            and software ECN has full access. The turbines have 10           three nearby 108 m meteorological masts. The unusually
tification of their prototype turbines. This system is called     measurements of mechanical loads, power performance and                                                                                                                                                          kW rated power, a rotor diameter of 7.6 m and a hub height       densely spaced wind measurements capture the com-
DANTE and was developed by ECN. It aims at high reliabi-         acoustic noise production. ECN is specialized in custom      The Vestas NM 92 prototype and the 50kV/36MVA transformer station. This turbine was installed in 2003 and removed in 2007.                                                                                           plete wind field. This gives valuable additional information
lity, is independent from electro magnetic interference and      made measurement campaigns.                                                                                                                                                                                                                                                       compared to the usual measurement of the wind speed at
                                                                                                                                                                                                                                                                                                                                                   a single location.
                                                                                                                              A wind turbine manufacturer can lease the location for a                         with a maximum hub height of 100 m and a rotor diameter                                                                             Benefits
                                                                                                                              period of typical four to five years. He pays a yearly lease                      up to 120 m. The route to obtain a building permit is rela-                                                                         This worldwide unique research facility gives further
                                                                                                                              fee and receives in return the benefits of the produced                           tively short. Usually the civil activities at the site can start                                                                    insights in the field of wind farm aerodynamics, wake
                                                                                                                              electricity. The test site can accommodate prototypes with                       within three months after the lease contract is concluded.                                                                          interaction and wind farm control. The high quality data are
                                                                                                                              installed electrical powers up to 6 MW each.                                     The 10kV grid connection cables are already available at                                                                            used for the development and validation of wind farm aero-
                                                                                                                              The test site has an environmental permit for wind turbines                      the prototype locations.                                                                                                            dynamic models and wind farm control strategies. This will
                                                                                                                                                                                                                                                                                                                                                   allow operating a wind farm at maximum efficiency while
                                                                                                                                                                                                                                                                                                                                                   guaranteeing at the same time a maximum in reliability and
                                                                                                                                 Wind turbine type                      DD115                          GE 2,5                        GE 2,5                  Siemens 3,6                                                                           a minimum in mechanical and electrical loads.
                                                                                                                                      Manufacturer                      Darwind                   General Electric              General Electric           Siemens Wind Power                                                                      ECN not only uses the scaled farm to improve its own
                                                                                                                                     Rotor diameter                      115 m                          100 m                         100 m                      107 m                                                                             knowledge but also to initiate other collaborations with
                                                                                                                                       Hub height                        100 m                          85 m                          100 m                      80 m                                                                              national and international partners, coming from research
                                                                                                                                                                                                                                                                                                                                                   institutes, universities and wind turbine manufactures.
                                                                                                                                     Installed power                    4,6 MW                         2,5 MW                        2,5 MW                     3,5 MW
                                                                                                                                   (To be) installed in                   2009                          2004                          2007                       2005

Five Nordex N80 wind turbines owned by the test site

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