Search found 9 matches

by Nikhar.Abbas
Mon Jul 27, 2020 7:50 pm
Forum: Controls
Topic: Individual Pitch Control
Replies: 6
Views: 240

Re: Individual Pitch Control

Hi Sina,

There is a working version of ROSCO in MATLAB/Simulink on the develop branch of the ROSCO toolbox here:
https://github.com/NREL/ROSCO_toolbox/t ... ab_Toolbox

Please be sure to look through the ReadMe, as you will need to have some other tools installed as well.

Nikhar
by Nikhar.Abbas
Mon Jul 27, 2020 10:28 am
Forum: Controls
Topic: Individual Pitch Control
Replies: 6
Views: 240

Re: Individual Pitch Control

Hi Sam, Unfortunately, there is not much extensive documentation that exists yet for the IPC controller. This implementation was first briefly mentioned in: https://iopscience.iop.org/article/10.1088/1742-6596/1037/3/032009/pdf Since then, this work has been published that discusses the idea of the ...
by Nikhar.Abbas
Tue Jun 30, 2020 5:22 pm
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 65
Views: 28696

Re: DTU 10-MW Reference Wind Turbine

Hi Lixian, I am not currently able to re-construct your results. I am running OpenFAST in single precision with a 64 bit architecture and the most recent version of ROSCO. My results are below. Let me know if if your problems persist after updating your IEA 10MW model. Also, just to note, the power ...
by Nikhar.Abbas
Thu Jun 25, 2020 10:12 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 65
Views: 28696

Re: DTU 10-MW Reference Wind Turbine

Hi Lixian, Glad to see that you got the ROSCO controller working. A few quick questions: Is the x-axis here time-steps? Or time? Also, I am not sure I see what you mean when you say that there are "some numerical instabilities in the generator power". Are you referring to the drops in gene...
by Nikhar.Abbas
Tue May 26, 2020 4:51 pm
Forum: Controls
Topic: ROSCO Toolbox - Relationship Between Integral Gain & Damping of Fore-Aft Mode
Replies: 2
Views: 344

Re: ROSCO Toolbox - Relationship Between Integral Gain & Damping of Fore-Aft Mode

Hi Sam, Ervin Bossanyi (amongst others) has proposed a simple analytical relationship: https://onlinelibrary.wiley.com/doi/abs/10.1002/we.95 For the tower fore-aft damping control, the `FA_KI` term is multiplied times a high-pass filtered integrated tower-top fore-aft signal and added to the standar...
by Nikhar.Abbas
Thu May 07, 2020 2:51 pm
Forum: Controls
Topic: ROSCO Equivalent Wind Speed Estimator Struggling Due to Blade Deflection
Replies: 7
Views: 678

Re: ROSCO Equivalent Wind Speed Estimator Struggling Due to Blade Deflection

Hi Sam, It certainly could improve results, but it is hard to say specifically. There is so much coupling going on between everything that it would certainly take some time spent modifying and tuning the specifics of the controller and WSE to find the best ways to improve performance. Modifying the ...
by Nikhar.Abbas
Thu May 07, 2020 12:15 pm
Forum: Controls
Topic: ROSCO Equivalent Wind Speed Estimator Struggling Due to Blade Deflection
Replies: 7
Views: 678

Re: ROSCO Equivalent Wind Speed Estimator Struggling Due to Blade Deflection

Hi Sam, Good to hear! Yes, you are correct - ti corresponds to the turbulence intensity. The way it is now, it is a hard coded value. It could certainly be made a time-dependent (or wind-dependent) value that evolves over time if wanted/needed. The selection of ti, as well as the other parameters/va...
by Nikhar.Abbas
Thu May 07, 2020 11:07 am
Forum: Controls
Topic: ROSCO Equivalent Wind Speed Estimator Struggling Due to Blade Deflection
Replies: 7
Views: 678

Re: ROSCO Equivalent Wind Speed Estimator Struggling Due to Blade Deflection

Hi Sam,
Just to clarify, was the instability due to the WSE, or elsewhere in the setup?

Nikhar
by Nikhar.Abbas
Thu Apr 30, 2020 10:01 am
Forum: Controls
Topic: Pitch Control Before Rated Speed
Replies: 5
Views: 628

Re: Pitch Control Before Rated Speed

Hi Sam, I might be able to answer your questions in a little bit more detail here. You are correct, the setpoint smoothing simply shifts the reference generator speed for the generator torque and blade pitch PI controllers so that they do not “fight” each other. If I understand your problem correctl...

Go to advanced search