Turbsim for Class IV from IEC 61400-1 2nd edition

Discuss the effects of turbulence on wind turbines and its simulation.

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Nicolas.Munoz
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Turbsim for Class IV from IEC 61400-1 2nd edition

Postby Nicolas.Munoz » Mon May 27, 2019 8:25 am

Hi everybody,

I am using Turbsim for some simulations for a wind turbine for low winds. I wanted to use in Turbsim the former standard Class IV of the IEC 61400-1 second edition, which corresponds to lower wind speeds. Since there is the possibility to use the second edition for the "IECstandard" for the scaling, I was wondering if something similar could be done in "IEC_WindType" whith extreme turbulence "ETM" & "EWM". If this is not a possibility offered by Turbsim, would it be possible to mannually insert the corresponding parameters of the old class IV through the input file?

Thanks a lot

Best regards

Nicolas

Jason.Jonkman
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Re: Turbsim for Class IV from IEC 61400-1 2nd edition

Postby Jason.Jonkman » Tue May 28, 2019 6:46 am

Dear Nicolas,

While TurbSim supports the second edition of IEC 61400-1, I don't see from its documentation that it supports class IV winds. However, you can always specify your own turbulence conditions in TurbSim, e.g., by setting IEC_WindType = NTM and IECturbc to the desired turbulence intensity in percent.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Nicolas.Munoz
Posts: 3
Joined: Mon May 27, 2019 2:50 am
Organization: self
Location: Germany

Re: Turbsim for Class IV from IEC 61400-1 2nd edition

Postby Nicolas.Munoz » Tue May 28, 2019 7:44 am

Dear Jason,

First of all thanks for the fast answer.

I actually do not have the second edition of IEC 61400-1, I extracted this information from the first edition of the Tony, B., David, S., Nick, J., and Ervin, B., 2001, "Wind Energy Handbook", Wiley, New York, section 5.1.2 IEC61400-1. I attach the corresponding table where the classes are defined.

With respect to the suggested solution, since I am simulating different hub wind speeds, I am not sure if I can set the desired turbulence intensity with NTM, because, if I understand correctly, then it won't be able to follow a curve as it was doing when choosing a defined category for IECturbc, like the ones shown in the TurbSim Manual: "Figure 7. Longitudinal wind-speed standard deviation and TI for IEC turbulence categories as functions of the mean hub-height wind speed, Vhub".

I guess that I should specify then a desired turbulence intensity for each hub wind speed, isn't it?

Thanks in advance,

Best regards,

Nicolas
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Jason.Jonkman
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Re: Turbsim for Class IV from IEC 61400-1 2nd edition

Postby Jason.Jonkman » Tue May 28, 2019 9:49 am

Dear Nicolas,

Correct. TurbSim is run separately for each mean wind speed (etc.), so, set the turbulence intensity appropriate to each mean wind speed you simulate.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Nicolas.Munoz
Posts: 3
Joined: Mon May 27, 2019 2:50 am
Organization: self
Location: Germany

Re: Turbsim for Class IV from IEC 61400-1 2nd edition

Postby Nicolas.Munoz » Tue May 28, 2019 10:14 am

Dear Jason,

Okay, thanks a lot.

Best regards


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