Blade pitch control

This forum if for discussing controls. Questions about how to implement controls in FAST are more appropriate to the CAE Tools forum.

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Lei.Duan
Posts: 14
Joined: Mon Oct 29, 2012 2:13 am
Organization: Kyushu University
Location: Japan

Blade pitch control

Postby Lei.Duan » Wed Apr 16, 2014 9:18 pm

Hi, all.
Now, I am working on the blade pitch control of 5-MW baseline wind turbine.
I would like to use a simple model of the blade pitch actuator as
dot(B)=-1/tau*B+1/tau*Bd
where B is the blade pitch angle; tau is the time constant; and Bd is the desired blade pitch angle as a command.

Could anyone tell me how to determine the value of tau for such a reference wind turbine?

Thanks in advance.

Best regards
Lei DUAN

Jason.Jonkman
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Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
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Re: Blade pitch control

Postby Jason.Jonkman » Thu Apr 17, 2014 7:39 am

Dear Lei DUAN,

Section 7.4 of the NREL 5-MW specifications report describes the characteristics of a very fast blade-pitch actuator: http://www.nrel.gov/docs/fy09osti/38060.pdf. I'll let someone else respond if they know of more realistic values for a 5-MW turbine.

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

Lei.Duan
Posts: 14
Joined: Mon Oct 29, 2012 2:13 am
Organization: Kyushu University
Location: Japan

Re: Blade pitch control

Postby Lei.Duan » Sat Apr 19, 2014 4:39 am

Dear Jason,
Thanks for your reply.
I also think the pitch actuator mentioned in Section 7.4 is too fast.

Anyway, thank you very much.

Best regards,
Lei DUAN

Jinsong.Liu
Posts: 10
Joined: Sat Jan 25, 2014 12:34 am
Organization: University of Texas at Austin
Location: Texas. Austin, The United States of America

Re: Blade pitch control

Postby Jinsong.Liu » Tue Jun 24, 2014 1:42 pm

thank you for your prompt response. I get it now! :)
Last edited by Jinsong.Liu on Tue Jun 24, 2014 4:40 pm, edited 1 time in total.

Jason.Jonkman
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Location: Boulder, CO
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Re: Blade pitch control

Postby Jason.Jonkman » Tue Jun 24, 2014 2:36 pm

Dear Jinsong,

As discussed in several papers (e.g.: http://www.nrel.gov/docs/fy08osti/42589.pdf), the control system may have a strong influence on the response of a FOWT and vice-versa. Have you adopted a controller (particularly the pitch-control gains) to work with your floating wind system?

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

MohamedYassin.Oukila
Posts: 3
Joined: Mon Jun 02, 2014 6:54 am
Organization: Ecole Centrale de Nantes
Location: France

Re: Blade pitch control

Postby MohamedYassin.Oukila » Fri Jul 11, 2014 7:55 am

Jason.Jonkman wrote:Dear Lei DUAN,

Section 7.4 of the NREL 5-MW specifications report describes the characteristics of a very fast blade-pitch actuator: http://www.nrel.gov/docs/fy09osti/38060.pdf. I'll let someone else respond if they know of more realistic values for a 5-MW turbine.

Best regards,


Dear Jason,

I am currently trying to run the 5-MW NREL onshore using "FAST_v7.02.00d-bjj_AeroDyn_v13.00.02a-bjj_BladedDLLInterface.exe". I want to run the same wind turbine in Bladed. Is DISCON.DLL is the same controller as the one used in the exe mentioned before?
I have to model the pitch actuator in Bladed. Have you found any realistic values for this turbine?

Regards,
Ecole Centrale de Nantes, France
Final year student (Equivalent to an MSc) in Ocean and Hydrodynamic engineering

Paul.Fleming
Posts: 34
Joined: Tue Apr 02, 2013 9:27 pm
Organization: NREL
Location: Colorado

Re: Blade pitch control

Postby Paul.Fleming » Fri Jul 11, 2014 1:11 pm

Hi,

I think I can help on this. DISCON.DLL should be in the Bladed external controller format already so should be the same. I'm not sure there is defined a pitch actuator for this turbine. A reasonable choice though is probably just a first or second order lag.

Paul

Raivis.Nikitins
Posts: 2
Joined: Fri May 13, 2016 3:23 am
Organization: Adaplab
Location: Riga, Latvia

Re: Blade pitch control

Postby Raivis.Nikitins » Sat Jun 04, 2016 3:02 am

Dear All,

I would like to learn what is the main objective of the blade-pitch process control? Could anyone describe in more detail (possibly using charts) what is happening when PI is used for eroded blades?

Thank you,

Raivis.Nikitins

Jason.Jonkman
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Location: Boulder, CO
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Re: Blade pitch control

Postby Jason.Jonkman » Mon Jun 06, 2016 6:33 am

Dear Raivis,

The main objective of a baseline blade-pitch control system is to regulate the rotor (or generator) speed. See section 7.3 of the NREL 5-MW specifications report for the development of a standard baseline pitch control system: http://www.nrel.gov/docs/fy09osti/38060.pdf.

More advanced pitch control systems may include additional actuation (e.g. independent blade pitch) and additional control objectives (e.g. reducing loads).

If the rotor-blades are eroding, the controller gains may not be as the designer expected and the controller would not perform optimally.

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

Raivis.Nikitins
Posts: 2
Joined: Fri May 13, 2016 3:23 am
Organization: Adaplab
Location: Riga, Latvia

Re: Blade pitch control

Postby Raivis.Nikitins » Wed Jun 08, 2016 6:39 am

Thank you, Jason!

I will study the NREL 5-MW specifications report.

Best regards,

Raivis.Nikitins
Adaplab

zarei.atefe
Posts: 15
Joined: Mon Apr 22, 2019 7:13 am
Organization: self
Location: iran

Re: Blade pitch control

Postby zarei.atefe » Fri Nov 29, 2019 3:12 am

Hi everyone
I'm working on individual pitch control and set PCMode to 4 to get the pitch command from the simulink controller but the pitch remains fixed to the final value of 2.6 and does not command the simulink. Where is the problem?
thanks

Jason.Jonkman
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Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Blade pitch control

Postby Jason.Jonkman » Fri Nov 29, 2019 8:53 am

Dear Zarei,

Are you saying that you running FAST interfaced to Simulink, you've set PCMode=4, but the commands from Simulink are being ignored? Have you enabled the override pitch maneuvers (TPitManS(*), PitManRat(*), BlPitchF(*)), which override the commands from the controller?

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

zarei.atefe
Posts: 15
Joined: Mon Apr 22, 2019 7:13 am
Organization: self
Location: iran

Re: Blade pitch control

Postby zarei.atefe » Fri Nov 29, 2019 9:09 am

No I did not enable these. I just set PCMODE to 4 and then run the simulation.

Jason.Jonkman
Posts: 4394
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Blade pitch control

Postby Jason.Jonkman » Fri Nov 29, 2019 9:16 am

Dear Zarei,

And you are running the simulation from Simulink?

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

zarei.atefe
Posts: 15
Joined: Mon Apr 22, 2019 7:13 am
Organization: self
Location: iran

Re: Blade pitch control

Postby zarei.atefe » Fri Nov 29, 2019 9:48 am

Yes, I'm running from Simulink.


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