Search found 11 matches

by Etienne.Jargot
Thu Oct 11, 2018 4:10 am
Forum: Rotor Aerodynamics
Topic: NREL 5-MW reference turbine - CP, CQ, CT Coefficients
Replies: 35
Views: 77619

Re: NREL 5-MW reference turbine - CP, CQ, CT Coefficients

Dear Jason,

I computed the thrust coefficient vs wind speed with the stand alone Aerodyn V15.
The results are shown below.
Does the results seem coherent?

Thank you.

Best regards,
Etienne JARGOT
by Etienne.Jargot
Thu Sep 27, 2018 9:10 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Ok I get it, thank you for your time.
The information you gave me are very helpful.

Best regards,
Etienne
by Etienne.Jargot
Thu Sep 27, 2018 7:04 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Dear Jason, Ok thank you, now I understand better. And when you said "If you can prescribe the generator torque and pitch ramps...", you mean that the generator torque will not be zero below cut-in generator speed such as the control logic of Servodyn.f90 or zero above cut-out wind speed? ...
by Etienne.Jargot
Thu Sep 27, 2018 1:30 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Dear Jason,

I guess I misunderstood the behavior of a wind turbine.
Is it right when the wind speed drops under the cut in speed and the rotor speed is still high, the TSR is quite high so the Cp and the aerodynamic power becomes negative?

Thank you for your explanations.

Best regards,
Etienne
by Etienne.Jargot
Wed Sep 26, 2018 9:26 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Dear Jason, I understand you are not in expert on that topic, but I am not sure you understood exactly what I am trying to do. I agree about the pitch rates and the timing, I will make some assumptions about that. But I don't know how can I model a coherent rotor deceleration when both aerodynamic a...
by Etienne.Jargot
Wed Sep 26, 2018 8:05 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Sorry Jason but just to be sure, again about the start-up/shut-down region, you don't know the behavior of the rotor deceleration/acceleration with the wind speed and the pitch angle in these regions?
by Etienne.Jargot
Wed Sep 26, 2018 6:28 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Ok, I think I need to see directly how the Simulink generator block is built.

Thank you, have a good day.

Etienne JARGOT
by Etienne.Jargot
Wed Sep 26, 2018 3:09 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Dear Jason, I've already looked in the literature but unfortunately I didn't find a lot of information about that topic. I guess I should take a look again. Would you have any advice about how to implement a PMSG or DFIG model combined with the NREL 5W wind turbine model ? I looked briefly the NREL ...
by Etienne.Jargot
Tue Sep 25, 2018 9:54 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Dear Jason, Thank you very much. You're right, the electrical power is smoother than the aerodynamic power. I don't know if I need to create a new topic about that but I would like to know also how can I model the behavior of the wind turbine below the cut-in speed and above the cut-out speed? Espec...
by Etienne.Jargot
Tue Sep 25, 2018 7:28 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

Re: NREL 5MW Control design - Power deviation

Dear Jason, Thank you for your answer. Regarding the large excursions in rotor power, can I ask how you are calculating rotor power? RotPwr = 1/2 * AirDensity* PI * Rot_Radius^2 * Cp(TSR, Pitch) * WindSpeed^3 Considering the limits of the IEC 61131-3 language, the Cp is an approximation made with so...
by Etienne.Jargot
Tue Sep 25, 2018 4:01 am
Forum: Controls
Topic: NREL 5MW Control design - Power deviation
Replies: 17
Views: 7499

NREL 5MW Control design - Power deviation

Hello, I am currently reproducing the control logic of Servodyn.f90 into IEC 61131-3 programming languages for programmable logic controllers. I am a bit lost about my results and I would like to have an external opinion. As attached, you will find my results for two configurations: - above rated - ...

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