Offshore wind farm. Copenhagen, 10 March Charlotte Hasager. Senior scientist DTU Wind Energy. Application of mesoscale models with wind farm
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1 Copenhagen, 10 March 2015 Application of mesoscale models with wind farm EERA parametrisations Design in EERA-DTOC Tool for P. J. H. Volker(1), J. Badger(1), A. N. Hahmann(1),. S. Hansen(1), M. Badger(1), R. Husson(2),P. Vincent(2), N. Longepe(2), A. Mouche(3) and C. B. Hasager(1) (1) DTU Windenergy (Denmark) (2) CLS, Plouzane (France) (3) IFREMER (France) Offshore wind farm Peter Cluster Hauge Madsen. (DTOC) Director Charlotte Hasager. Senior scientist DTU Wind Energy Support by
2 Introduction It becomes increasingly important to better understand wakes of wind farms, especially their: Wakes behind Belwind/Thornton (1) Properties (Extension, Dynamics) (2) Long-term impact Content: EERA-DTOC Project Mesoscale models Mesoscale models in EERA-DTOC Introduction 2/11
3 EERA-DTOC EERA-DTOC (Seventh Framework Programme (FP7)): European Energy Research Alliance - Design Tool for Offshore Wind Farm Cluster Integrated and validated design tool combining state-of-the-art wake, yield and electrical models Universities/Institutes: DTU Wind Energy (Denmark) ECN (Netherlands) Universität Oldenburg (Germany) Fraunhofer (Germany) CRES (Greece) CIEMAT (Spain) CENER (Spain) CLS (France) Industry: Carbon Trust (United Kingdom) RES (United Kingdom) Overspeed (Germany) Statoil (Norway) Statkraft (Norway) Iberdrola (Spain) EON (Sweden) EERA-DTOC Project 3/11
4 DTOC User Interface Interface in which wake models can be run with wind climate from WRF Outcome: for example Annual Energy Production and net yield EERA-DTOC Project 4/11
5 Mesoscale models are used for: Mesoscale Model (General) { Forecasting the weather Wind resource assessment Weather Research and Forecast model (WRF) Cells for an area km 2 On our cluster: 2/3 Days per year on 70 X 20 processors Wind Farm parametrisation in Mesoscale Models 5/11
6 Wind Farm Parametrisations WRF Wind Farm scheme (Fitch et al.2012): (1) Local drag force (2) Additional TKE source term EWP approach accounts for unresolved expansion and applies: (1) Grid-cell averaged drag force Concept: σ 0 σ(x) HUB Us(0) Us(x) z x Sketch of the wake development within a grid-cell L For both schemes turbulence shear is regulated by the PBL-Scheme Wind Farm parametrisation in Mesoscale Models 6/11
7 Mesoscale Model (Evaluation) Qualitative comparison with Synthetic Aperture Radar (SAR) images. They can retrieve wind speed from back-scatter (higher wind speeds are brighter): RADARSAT-1/-2 from Data and Products c MacDonald, Dettewiler and Associates Ltd are acknowledged. SAR Image (17:34 UTC) WRF-EWP (17:30 UTC) 17:30 1 st of July of 2013: Belwind &Thornton Comparable extension and divergence Mesoscale Model evaluation 7/11
8 Mesoscale Model (Evaluation cont d) SAR Image (17:41 UTC) WRF-EWP (18:00 UTC) 30 th of April 2013: UK wind farms and Belwind &Thornton Challenge in timing snap-shots Mesoscale Model evaluation 8/11
9 Mesoscale Model in EERA-DTOC Three institutes (CENER, CIEMAT and DTU) can calculate a Wind Climate for a target area Without and with background wind farms The Mesoscale model provides at the target area for a given period: - Time-Series - Modelled Wind Climate - Generalised Wind Climate (DTU) Mesoscale Models in EERA-DTOC 9/11
10 Wind Climate with background Wind Farms Example: 2 years simulation in the North-Sea with 2 background wind farms Time averaged wind speed at hub-height Reference Wind Farm Mesoscale Models in EERA-DTOC Difference 10/11
11 Conclusions Mesoscale models: Accounts for the dynamics in the wind farm wake The wind farm parametrisations do not resolve the local flow around turbines How well are they able to estimate the long-term velocity reduction of neighbouring wind farms? Within the EERA-DTOC tool: Neighbouring wind farms can be accounted for in time-series and the wind climate Annual Energy production for a new wind farm for the Wind climate with/without neighbouring wind farms Conclusions 11/11
12 Support by This project has received funding from the European Union s Seventh Programme for research, technological development and demonstration under grant agreement No FP7-ENERGY / n
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