## Pitch and Torque Cntrl (Region 3)

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

Moderator: Bonnie.Jonkman

Jason.Jonkman
Posts: 5738
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: Pitch and Torque Cntrl (Region 3)

Dear Hamidreza,

I assume you are using steady and uniform wind inflow? In this case, I would expect the power and torque to be constant after the start-up transient. It looks like the power is constant and the torque is heading that way. It would also be informative to plot the rotor speed and blade-pitch angle.

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

Hamidreza.Mor
Posts: 8
Joined: Wed Jul 03, 2019 5:49 am
Organization: self
Location: Iran

### Re: Pitch and Torque Cntrl (Region 3)

I use Binary TurbSim Full-Field Wind for my case.
wind speed, Rotor Speed and Blade-Pitch angle are as below:
Attachments
3.JPG (46.92 KiB) Viewed 1345 times
2.JPG (54.56 KiB) Viewed 1345 times
1.JPG (89.62 KiB) Viewed 1345 times

Jason.Jonkman
Posts: 5738
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: Pitch and Torque Cntrl (Region 3)

Dear Hamidreza,

Your power has an odd start-up transient because you have not initialized the blade-pitch angle properly. In general, to minimize the start-up transient, I recommend that you initialize the rotor speed and blade-pitch angles to their expected values for the given mean wind speed. For 18 m/s, this would be RotSpeed = 12.1 rpm and BlPitch = 14.92 deg for the NREL 5-MW baseline turbine, per its specifications report: http://www.nrel.gov/docs/fy09osti/38060.pdf. Otherwise, the response is as I would expect it to be.

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

Hamidreza.Mor
Posts: 8
Joined: Wed Jul 03, 2019 5:49 am
Organization: self
Location: Iran

### Re: Pitch and Torque Cntrl (Region 3)

Thanks.
My initial Rotor Speed is 12.1 rpm . but when i tried to set initial blades pitch to 14.92 degree i got this error:

Attachments
4.JPG (39.53 KiB) Viewed 1338 times

Jason.Jonkman
Posts: 5738
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: Pitch and Torque Cntrl (Region 3)

Dear Hamidreza,

Which version of FAST / OpenFAST are you using? There have been many bug fixes made to BeamDyn over the past couple of years. When running BeamDyn, I would suggest using the newest version of OpenFAST (dev branch).

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

Hamidreza.Mor
Posts: 8
Joined: Wed Jul 03, 2019 5:49 am
Organization: self
Location: Iran

### Re: Pitch and Torque Cntrl (Region 3)

I'm using FAST_v8.16

Jason.Jonkman
Posts: 5738
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: Pitch and Torque Cntrl (Region 3)

Hopefully upgrading to OpenFAST-dev will eliminate the BeamDyn problems you are facing.
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

### Who is online

Users browsing this forum: No registered users and 1 guest