Questions and answers

How do I submit my results?

Fill out the ‘Output template’ file included in the datapack. Be sure not to overlook any of the tabs in the file. Send your file to techworkshops[a]windeurope.org

By when do I need to submit my results?

The deadline for submitting results is Monday 28 June 2021. Please submit in CSV or XLSX.

Will my name / company name be associated with the results in the final presentation? Should I worry about confidentiality?

No. WindEurope will collect all responses and make them anonymous before passing them on to DTU for analysis. Each participant will receive a participant ID which will be referred to in the final presentation. So you will know who you are and how you performed, but others won’t. WindEurope will also act as an interface for communications between DTU and participants.

Typically we would use multiple data sources to reduce uncertainty in predictions. Is it OK to use additional data or is the intention to narrow the potential differences between competitors?

All participants will apply the same input data and follow the main steps in the energy yield assessment process. Therefore, all participants are required to use the Floating LIDAR data as well as the NEWA reference data (and all participants are required to use no other wind data).

Are all participants required to use the full period of the NEWA reference data provided?

All participants will apply the same input data and follow the main steps in the energy yield assessment process. Therefore, all participants are required to use the full period of the Floating LIDAR data as well as the full period of the NEWA reference data (and all participants are required to use no other wind data).

Is the expectation the NEWA is used to model the wind flow from the measurements to the WTG locations or is this left open to the participants?

The different participants will apply different modelling and therefore derive different results. This will allow for specific comparisons of the different results and modelling.

Are the direction measurements with respect to magnetic north or have they been corrected to true north?

The north reference is True North.

Can you please provide the time zones of the wind data sets (floating lidar and NEWEA data)?

Times are given as Local Standard Time for the Irish Sea sites and data are synchronised.

Is the NEWA data 30 minute timestamp representative of the 30 minute period start or period end (similarly for the LiDAR 10 minute data)?

Times are given as ‘recorded time’ and refer to the end of the 30-min period.

Is it necessary to have a particular meso-scale model to carry out the analysis? Are WindSim or windPRO suitable software for the purpose?

The different participants will apply different modelling and therefore derive different results. This will allow for specific comparisons of the different results and modelling.

Can it be confirmed that the Floating LIDAR measurement heights are relative to mean sea level?

Floating LIDAR measurement heights are above mean sea level.

Is a pre-deployment verification against a trusted reference available for the Floating LIDAR – if so can this be provided?

The Floating LIDAR is a “WINDCUBE v2 OFFSHORE” which has been calibrated against the West of Duddon Sands met mast in accordance with IEC 61400-12-1 Annex L. The calibration report will not be provided.

Is it possible to be provided with wave climate at the validation and wave climate at site?

Wave climate at the validation and wave climate at site will not be provided.

Are Floating LIDAR standard deviation/turbulence intensity measurements available?

Floating LIDAR standard deviation/turbulence intensity measurements will not be provided.

Are Floating LIDAR air and sea temperature measurements available?

Floating LIDAR air and sea temperature measurements are not available.

Can FLiDAR SD measurements or data also be shared for better TI modelling?

FLiDAR SD measurements are not included in the data pack. Data not included in the original data pack, will not be shared with the participants (nimo).

What are the wind speeds of the power curves? (bin center? bin top? hub height or rotor averaged wind speed?)

Wind speeds of the power curves are not binned (as the power curves are not measured ones). Wind speeds of the power curves are at hub height.

What are the air densities of the power curves?

Power curves are at 1.225 kg/m3 standard air density.

What are the turbulence intensities of the power curves?

MHI-Vestas 8.25 MW power curve at 9% turbulence intensity. Siemens Gamesa 7 MW power curve at 7% turbulence intensity.

Can the turbine rotor speed RPM profile be provided for all the turbine types to be considered?

Turbine rotor speed RPM profile will not be provided for any of the turbine types.

Can you please provide WTG cut out and restart parameters?

WTG cut out and restart parameters will not be provided for any of the turbine types.

We would like to participate to the CREYAP exercise but were wondering on how much detail we will receive feedback on our estimation? For example, is the blockage effect specifically assessed on this wind farm by a measurement prior to and during the operation of the wind farm?

Participant’s identities will be unknown to DTU and communication to any participant will be through WindEurope. There will be no direct feedback from DTU to individual participants. The presentation will show where each participant stands, and participants will know their own ID (number). Any possible blockage effect for the Walney Extension offshore wind farm has not been assessed by any measurement.