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| Title | Ecofys wind turbine test site: LiDAR Validation study, Wakes study, Turbulent effect of the forest, Wind Data Pre-Processing Tool 'Spider' |
| Group | Meteorology and Air Quality Group |
| Project type | internship |
| Credits | 24 |
| Supervisor(s) | Erik Holtslag (E.Holtslag@ecofys.com) |
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| Contact info | See for more information: www.ecofyswtts.com |
| Begin date | 2018/01/01 |
| End date | 2019/02/01 |
| Description | Test Site Lelystad – a full service wind turbine testing facility – provides a comprehensive range of facilities for prototype testing, infrastructure, wind measurements and wind turbine testing services. With 10 positions for wind turbine prototyping and certification measurements, and a combined installed power of 30 MW, this is the largest site of its kind in Europe. The testing facility, which is located at Wageningen University and Research’s location near Lelystad in The Netherlands and operated by Ecofys Wind Turbine Testing Services (WTTS), can serve the latest generation turbines with rotor tip heights up to 200 metres. All of the positions at the site are currently occupied, serving seven different international wind turbine manufacturers.
The following internship positions are at present (November 2012) available: 1 LiDAR Validation Study LiDARs, laser based measurement devices recording wind speed, wind direction and turbulence are being validated by using measurements from adjacent met masts. Previous experiments have shown excellent correlations to IEC compliant met masts. Turbulence recordings are however not yet fully reliable and cannot yet be corrected for. Study would focus on implementing the best possible verification scripts to compare the LiDAR with the mast readings. 2 Wakes Study Ecofys WTTS has now two prototype wind turbines being tested on its Test Site Lelystad. Met masts are positioned in such a way that 1Hz measurements of the upstream and downstream wind flows of one of these wind turbines is being recorded for specific wind sectors. The study would focus on using this data to estimate and compare the wake deficit at the distance of either of the met masts with the efficiency curve of the wind turbine. Other relevant aspects would be the turbulence levels generated by the wind turbines, mixing effect of the turbines meteorological parameters etc. 3 Turbulent Effect of the Forest In the Southern sectors of the site patches of forest exist (25-30m tall, about 100 deep and 5 km long). These affect the turbulence and shear levels of the location as already recorded by the met masts in different sectors. The study would focus on modelling this effect and comparing using CFD software such as OpenFoam/OpenCFD but also (potentially) WindSim and comparing the outcomes with the readings of the different masts. 4 Wind Data Pre-Processing Tool 'Spider' Extensive data flows from met masts and LIDAR stations are the most important input of any wind resource assessment. The output of any analysis is only as good as the quality of the data. It is for this reason that it has to be processed before any calculation actually takes place. Furthermore, data gaps or bad quality data needs to be acted upon as soon as possible, to achieve the highest possible availability of good data. This vital checking process, preferably done on a (semi-) continuous basis can however be too time- and resource-demanding. The database-ingestion tool Spider has been developed by Ecofys for this reason in order to automatically carry out quality checks on the incoming data. The tool has been programmed in Visual Basic. The study would focus on the optimization and further implementation of the tool, its practical application on Test Site Lelystad data streams and the (further) implementing of smart quality control checks. |
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