Wrong Roughness Used In Downscaling EmdConWx

Status: Closed - part of windPRO 3.0 Service Pack 3

Fixed in build: 633

For PARK-calculations using the Scaler to downscale the EMD-ConWx meso scale data we noticed a problem which is fixed in Service Pack 3. The problem is related to the downscaling method only and does not affect the use of the meso scale data as regular time series as for:

• Long-term-correlation via MCP
• creating a wind-index

In case the data is used for downscaling as time-varying PARK calculation, there is no impact on the results if

• … the data is used at an offshore-site

Onshore there is a minor impact if

• … the post calibration factors are determined based on reference WTGs at a similar hub height as the planned WTGs

Onshore there may be a significant impact if

• … the post calibration factors are determined based on reference WTGs at considerably different hub height as the planned WTGs

We recommend installing windPRO 3.0 Service Pack 3 and inspecting the calculations at which a significant impact is expected. The degree of the impact is defined by the specific terrain and wind conditions of the site. In case you note considerable differences in your results we recommend inspecting also other projects at similar site conditions although only a minor impact would be expected according to the upper systematic.

We apologize for the problem and are happy to answer upcoming questions. In case you already use the downscaling method of the EMD-ConWx data and would like to get more details concerning the problem, please contact us via the EMD Hotline Service support@emd.dk