Search found 11 matches

by Jinghan.Cui
Wed Aug 01, 2018 2:27 pm
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jason, I have another question about the thrust coefficient Ct. The attachment is the surface of Ct obtained by AeroDyn. From this figure, we can see that when the wind speed is high ,i.e. the wind turbine operates in the full load region, the thrust coefficient Ct may be negative. Do you know ...
by Jinghan.Cui
Tue Jul 24, 2018 12:53 pm
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jinghan, There may be some time variation due to how the aerodynamics solution is initialized and depending on what functionality you've enabled e.g. unsteady airfoil aerodynamics, especially considering that you have a fixed yaw error. If you need constant outputs for a given case, I would re...
by Jinghan.Cui
Tue Jul 24, 2018 11:56 am
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jason, Sorry to bother you again. The Standalone AeroDyn works well now. But I have a question about the outputs. I fix these parameters (WndSpeed, RotSpeed, Pitch) at constants. And the results show the RtTSR and RtSpeed remain unchanged. But why the RtAeroCp, RtAeroCt and RtAeroPwr change alo...
by Jinghan.Cui
Fri Jul 20, 2018 11:41 am
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jinghan, No, you don't need to download FAST to use the standalone AeroDyn archive. ReadFASTtext.m is included in the MATLAB Toolbox, which you do need to install and have in your search path if you intend to use PlotClCdCmCurves_DT.m: https://github.com/OpenFAST/matlab-toolbox. The combined-c...
by Jinghan.Cui
Thu Jul 19, 2018 11:25 am
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jason, I am working on drawing the Cp and Ct for the NREL 5-MW turbine using AeroDyn v15. But do I need to download the FAST archive since it presents 'Undefined function or variable 'ReadFASTtext' in Matlab when I ran 'PlotClCdCmCurves_DT.m'. and could you give me a guide for getting more data...
by Jinghan.Cui
Mon Jul 16, 2018 10:17 am
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jinghan, You can use the standalone driver for AeroDyn v15 to calculate the surface of power, torque, thrust (etc.) coefficient versus tip-speed ratio and blade-pitch angle. See the following forum topic of more information: https://wind.nrel.gov/forum/wind/viewtopic.php?f=2&t=1989&p=1...
by Jinghan.Cui
Fri Jul 13, 2018 3:03 pm
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jason,
Yes, I am working on the NREL 5-MW turbine. Do you know how to obtain the look-up table for coefficient Cp and Ct? Many papers present this Three-dimensional graph, but they do not tell the source and the corresponding data.

Jinghan
by Jinghan.Cui
Fri Jul 13, 2018 11:09 am
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jason, Thank you for your answer. Sometimes, we may need a explicit expression of the coefficient to forecast the dynamic of the system. Like the aerodynamic power coefficient Cp could be approximated by Cp = 0.5176 (116/λi − 0.4beta − 5) e−21/λi + 0.0068λ; 1/λi = 1/(λ + 0.08beta) - 0.035/(beta...
by Jinghan.Cui
Thu Jul 12, 2018 11:55 am
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jason, I encountered another problem while designing a controller for 5MW wind turbine. I would like to take the tower structural fatigue into consideration. But I could not find the expression of thrust force coefficient Ct. Could you give me any information of Ct that I could used in controll...
by Jinghan.Cui
Mon May 28, 2018 4:16 pm
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Re: Questions about controller design for 5MW wind turbine

Dear Jinghan.Cui, Small deviations above the rated value are expected with any controller, but I'm not sure I can quote what a "reasonable" value is. The deviations about the operating should be determined from some cost-benefit analysis e.g. in terms of actuator authority and load impact...
by Jinghan.Cui
Sat May 26, 2018 5:31 pm
Forum: Controls
Topic: Questions about controller design for 5MW wind turbine
Replies: 17
Views: 4586

Questions about controller design for 5MW wind turbine

Dear all, I am working on the advanced controller design for 5MW wind turbine. And I have some questions about wind turbine operating in the full load region. Can we permit the wind turbine opearting exceeding rated values, i.e. rated power, rated generator speed? If we can, to what extent can the w...

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