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Blade pitch control

Posted: Wed Apr 16, 2014 9:18 pm
by Lei.Duan
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

Re: Blade pitch control

Posted: Thu Apr 17, 2014 7:39 am
by Jason.Jonkman
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,

Re: Blade pitch control

Posted: Sat Apr 19, 2014 4:39 am
by Lei.Duan
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

Re: Blade pitch control

Posted: Tue Jun 24, 2014 1:42 pm
by Jinsong.Liu
thank you for your prompt response. I get it now! :)

Re: Blade pitch control

Posted: Tue Jun 24, 2014 2:36 pm
by Jason.Jonkman
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,

Re: Blade pitch control

Posted: Fri Jul 11, 2014 7:55 am
by MohamedYassin.Oukila
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,

Re: Blade pitch control

Posted: Fri Jul 11, 2014 1:11 pm
by Paul.Fleming
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

Re: Blade pitch control

Posted: Sat Jun 04, 2016 3:02 am
by Raivis.Nikitins
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

Re: Blade pitch control

Posted: Mon Jun 06, 2016 6:33 am
by Jason.Jonkman
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,

Re: Blade pitch control

Posted: Wed Jun 08, 2016 6:39 am
by Raivis.Nikitins
Thank you, Jason!

I will study the NREL 5-MW specifications report.

Best regards,

Raivis.Nikitins
Adaplab

Re: Blade pitch control

Posted: Fri Nov 29, 2019 3:12 am
by zarei.atefe
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

Re: Blade pitch control

Posted: Fri Nov 29, 2019 8:53 am
by Jason.Jonkman
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,

Re: Blade pitch control

Posted: Fri Nov 29, 2019 9:09 am
by zarei.atefe
No I did not enable these. I just set PCMODE to 4 and then run the simulation.

Re: Blade pitch control

Posted: Fri Nov 29, 2019 9:16 am
by Jason.Jonkman
Dear Zarei,

And you are running the simulation from Simulink?

Best regards,

Re: Blade pitch control

Posted: Fri Nov 29, 2019 9:48 am
by zarei.atefe
Yes, I'm running from Simulink.