Workshop 11: Windfield Reconstruction in the Induction Zone

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Workshop 11: Wind Field Reconstruction in the Induction Zone

Workshop 11 is organized by Task 32 in connection with a Power Curve Working Group meeting, and is hosted by EDP Renewables.


Nacelle-mounted lidars facing upstream of a wind turbine can measure the wind speed through the induction zone. Several nacelle lidar campaigns have indicated that the induction effect may be felt further upstream of the rotor than is commonly assumed in the design of power curve verification campaigns. To understand the magnitude of the induction effect, the freestream wind speed needs to be established. Since freestream velocity may only be reached beyond the measurement range of the nacelle lidar, an extrapolation based on the lidar measurements is necessary. A wind field model of the induction zone combined with the lidar line of sight wind speeds can be used to perform wind field reconstruction and derive not only the freestream wind speed, but also map the variation of the horizontal wind speed at different distances from the rotor.

No consensus exists on the optimal method for the wind field reconstruction in the induction zone that balances fidelity and simplicity. To take the first steps towards a common understanding in the community a round robin was organized to compare different methods and approaches to the wind field reconstruction problem on a common dataset


In the round robin preceding the workshop the participants have analyzed a dataset of nacelle lidar measurements from an offshore turbine with the aim to reconstruct the wind field in the induction zone upstream of the turbine by using wind speed measurements at multiple ranges. From the reconstructed wind field, the participants have derived the freestream wind speed.

The objective of the workshop is to present and discuss the methods and results of the round robin data analysis. By establishing the freestream wind speed, the community will get a better sense of the influence of induction on topics such as power curve verification, wind turbine power performance and wind farm power performance.

Workshop Format

The workshop will be a combination of:

  1. Presentations and comparisons of the round robin methods and results
  2. Group discussions

Expected Outcome

At the workshop the round robin wind field reconstruction methods and results will be presented. The workshop participants will discuss the pros and cons of the different methods and recommend the necessary steps towards a standard method for reconstructing the wind field in the induction zone from nacelle lidar measurements.

The outcome of the round robin will be

  1. An exchange of experience in wind field reconstruction techniques
  2. Creating links between the potential users and the researchers
  3. A set of collected results presented at the concluding workshop
  4. A list of barriers and possible solutions to the adoption of the techniques. After the workshop a working group will be initiated to write a common paper of the results and submit it to a conference.


The agenda is available at


To be confirmed.


Please register by 9 January 2019 using the button on the top right of this page!

Late registration is possible in exceptional circumstances: please contact the workshop leader for details.

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What is IEA Wind Task 32?

IEA Wind Task 32 works to identify and mitigate barriers to the use of wind lidar technology in wind energy applications such as site assessment, power performance, loads and control, and complex flow. We have written reports and peer-reviewed papers, held Round-Robin comparisons, produced Recommended Practices and worked with many organizations in academia, government, and industry.

We use workshops to make progress on specific themes and also find out from each other what still needs to be done. In the six years that the Task has been active, more than 400 people from 15 countries have taken part in about 20 meetings that have led to significant advances in the adoption of wind lidar.

Workshop Leader

This workshop is lead by Nicolai Gayle Nygaard of Orsted.

Who Can Attend

This meeting is limited to participants from countries in IEA Wind Task 32. If your country is not a participant in the Task but you country is a member of IEA Wind, please get in touch to discuss attending this workshop as a guest. Other potential participants should contact Task 32 directly.

Is This Workshop For Me?

This workshop topic is relevant for all nacelle lidar applications and is oriented towards everyone that uses nacelle lidar data in their day-to-day work. Scientists, lidar manufacturers, practitioners as well as end-users (e.g. developers and consultants) who work with this kind of lidar data are expected to participate at the workshop.

How Will My Data Be Used?

By registering through Eventbrite you agree to Eventbrite's terms and conditions. During the registration process you will be asked to agree to Task 32 and the workshop organizer using your email address to send you emails relating to this workshop and other Task 32 events that might be of interest. You will be given the chance to confirm your subscription to our emailing service and to unsubscribe. If this is not acceptable to you, please get in touch.

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