Questions about controller design for 5MW wind turbine

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Jinghan.Cui
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Questions about controller design for 5MW wind turbine

Postby Jinghan.Cui » Sat May 26, 2018 5:31 pm

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 wind turbine opearte over rated values so that it have less influence on using life? Do there any references account for this problem?

Best Regards
Jinghan.Cui

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Re: Questions about controller design for 5MW wind turbine

Postby Jason.Jonkman » Mon May 28, 2018 3:29 pm

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.

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

Jinghan.Cui
Posts: 6
Joined: Fri May 25, 2018 9:53 am
Organization: University of Alberta
Location: Canada

Re: Questions about controller design for 5MW wind turbine

Postby Jinghan.Cui » Mon May 28, 2018 4:16 pm

Jason.Jonkman wrote: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.

Best regards,


Dear Jason,

I see. Thank you very much!

Jinghan

Jinghan.Cui
Posts: 6
Joined: Fri May 25, 2018 9:53 am
Organization: University of Alberta
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Re: Questions about controller design for 5MW wind turbine

Postby Jinghan.Cui » Thu Jul 12, 2018 11:55 am

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 controller design?
Thank you for your time!
Jinghan

Jason.Jonkman
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Re: Questions about controller design for 5MW wind turbine

Postby Jason.Jonkman » Fri Jul 13, 2018 12:17 am

Dear Jinghan,

What do you mean by "expression of the thrust coefficient Ct"?

Ct is defined as RotorThrust/(1/2*AirDens*RotorSweptArea*RotorDiskAverageWindSpeedNormalToDisk^2).

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

Jinghan.Cui
Posts: 6
Joined: Fri May 25, 2018 9:53 am
Organization: University of Alberta
Location: Canada

Re: Questions about controller design for 5MW wind turbine

Postby Jinghan.Cui » Fri Jul 13, 2018 11:09 am

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^3+1);
So is there any approximate method for the thrust coefficient Ct?

Thank you for your time!
Jinghan

Jason.Jonkman
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Re: Questions about controller design for 5MW wind turbine

Postby Jason.Jonkman » Fri Jul 13, 2018 1:58 pm

Dear Jinghan,

Sorry, but I'm unfamiliar with the source of that approximate expression for Cp (presumably for the NREL 5-MW turbine?) and I'm unaware of whether there is a similar expression for Ct.

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

Jinghan.Cui
Posts: 6
Joined: Fri May 25, 2018 9:53 am
Organization: University of Alberta
Location: Canada

Re: Questions about controller design for 5MW wind turbine

Postby Jinghan.Cui » Fri Jul 13, 2018 3:03 pm

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

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Re: Questions about controller design for 5MW wind turbine

Postby Jason.Jonkman » Sat Jul 14, 2018 12:27 am

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: viewtopic.php?f=2&t=1989&p=10511 (this assumes a rigid rotor).

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

Jinghan.Cui
Posts: 6
Joined: Fri May 25, 2018 9:53 am
Organization: University of Alberta
Location: Canada

Re: Questions about controller design for 5MW wind turbine

Postby Jinghan.Cui » Mon Jul 16, 2018 10:17 am

Jason.Jonkman wrote: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: viewtopic.php?f=2&t=1989&p=10511 (this assumes a rigid rotor).

Best regards,

Thank you for your reply!


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