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Projects

ONGOING WIND RESOURCE RESEARCH PROJECTS

co-PI

Meteorological effects on wind resource estimation over inland sea - forecasts and climatology:

The project aims to improve the assessment of the wind resource over the Baltic Sea. The project will propose a better configuration of meteorological model systems for wind resource calculations over inland and, based on the most suitable configuration, evaluate the ability of different models to forecast winds.

The project is caried out in cliose collabouration with SMHI.

The project is financed by the Swedish Energy Agency.

co-PI

Wind power in Swedish cold climate - complete modeling chain:

In this project, the whole is studied from meteorological conditions to detailed calculations of how the ice affects the aerodynamic properties of turbines. Based on this, calculations are made of the turbines' production and load variations and how this depends on different types of ice build-up. The models are verified in close cooperation with the industry. The news value is thus new verified modeling opportunities to better understand the problem. Furthermore, the project provides new knowledge that can be applied to better understand how anti or de-icing systems can be set and controlled to work in the best possible way.

The project is caried out in cliose collabouration with Lund University, SMHI and Vattenfall Windpower.

The project is financed by the Swedish Energy Agency.

Wind power in Swedish forested conditions:

In the project, wind and turbulence measurements will be carried out at a research station in northern Sweden where extensive atmospheric measurements are already in progress. Analysis of data from wind farms will be carried out. A further development of model tools in openly accessible platforms will take place so that they explicitly take into account the forest. This is expected to give a better assessment of production, loads and watch losses. The project also include development of measurement methodologies for Sodar and Lidar in forested areas.

The project is carried out in collabouration with STENA Renewable, Fäboliden Vindkraft, AQ systems, OX2, SLU and Vattenfall Windpower.

The project is financed by the Swedish Energy Agency and VindForsk.

co-PI

Wind turbines in Swedish conditions - optimization of loads and production:

The aim of the project is to quantify differences in production and fatigue loads for wind turbines located in shoreline positions in the Baltic Sea and in forested complex environments compared to plants located offshore and in flat terrain.

The project is carried out in collabouration with Vattenfall Windpower, Fäboliden Vindkraft, Nordex, DTU, OX2, EON and STENA Renewable.

The project is financed by the Swedish Energy Agency and VindForsk.

co-PI

Farm Loads:

Farmloads is a project that further develops the initial studies in which equivalent loads were calculated with the so-called actuator disc and actuator line methods. The actuator disc method is relatively fast, which means that large parks can be calculated on supercomputers available to the research group.

By evaluating loads on lines (the actuator line method) or on a section of a disk surface (the actuator disc method) at each time step, a time series of loads is obtained. This time series is evaluated and equivalent forces are calculated. The properties of time series can be linked to different types of wear damage in different components and types of damage. Initial investigations together with Vattenfall show good agreement between calculated loads and detected blade damage.

Link to project homepage

Financed by The Research Council of Norway

Project Manager

Nordic Consortium:

Optimization and Control of large wind farms

The Nordic Consortium is a collabouration between Uppsala university UU, The Royal Institute of Techniology KTH, The Technical University of Denmark DTU and industrial partners from Sweden, Denmark and Norway. The consortium is a long term collabouration that gathers a number of ongoing projects.

The main aim is to continue the work on:

basic reseach on wake stability, i.e. to quantify the mechanisms behind the breakdown of the wake structure and thereby to be able to estimate wake lengths etc.
development of farm simulation tools to be able to optimize and control large wind farms.
and to coordinate collaboration within wind energy projects in the field at Uppsala University, KTH and DTU in close collaboration with the industry.

The Swedish part of the project is financed by the Swedish Energy Agency and VindForsk.

Swedish representant and responsible for link to IEA TAsk 29

IEA Annex 31, participation since 2011

WakeBench

The purpose of the project is to improve wind farm modeling techniques and provide a forum for industrial, governmental and academic partners to develop, evaluate and improve wind farm models. While Task 31 Phase 1 was limited to the wind farm (microscale) scale, Phase 2 will extend the scope to mesoscale and near-wake modeling in order to cover all the relevant atmospheric scales related to wind power meteorology. This will allow a more comprehensive approach to the wind farm integrated design process, facilitating the exchange of knowledge among various research communities: meteorologists, resource/site wind engineers and wind farm/rotor aerodynamicists. The focus will still be placed on wind resource assessment, site suitability and wind farm design but allowing for a larger variety of modeling approaches. Some benchmarks will also be explored in finer detail to better quantify the uncertainty of a range of models for different phenomena.

Financed by the Swedish Energy Agency

Link to IEA Wind Link to project homepage

Swedish representant, task leader task 3.3 wake inflow and responsible for link to IEA Task 31

IEA Task 29 - MexNext, participation since 2010

Analysis of wind tunnel measurements

The objective of IEA Wind Task MEXNEX(T) is a thorough investigation of various aerodynamic measurements. In Phase I the attention is focussed on the measurements which have been carried out in the EU sponsored Mexico project where Phase II investigates a wide variety of (Field and wind tunnel) experiments, Phas II also included the preparation and performance of the 'New Mexico' experiment. Special attention is paid to yawed flow, instationary aerodynamics, 3D effects, tip effects, non-uniformity of flow between the blades, near wake aerodynamics, turbulent wake, standstill, tunnel effects etc. These effects are analysed by means of different categories of models (CFD, free wake methods, engineering methods etc.). In the third phase of MEXNEX(T), the analysis of the New Mexico data is included (not forgetting other interesting measurements, e.g. measurements taken by FFA in the large CARDC wind tunnel in China in the 1980’s or CARDC PIV measurements on a 1/8 scaled down NREL Phase VI rotor, or LDA measurements from Mie University etc).

As such the Task provides insight on the accuracy of different types of models and (descriptions for) improved wind turbine models.