Search found 68 matches

by Sina.Ameli
Wed Jan 22, 2020 9:56 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman,

Thanks, I really appreciate that you replied to my questions promptly at all time.

Best regards,
Sina
by Sina.Ameli
Wed Jan 22, 2020 5:40 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, I have another question. Recently, I have read a paper implementing a controller (pitch control) on a 5MW offshore WT and shows the following results: Simulation results.PNG Now, I am confused. While I cannot get a settled response with NREL's PI control due to hydrodynamics, and m...
by Sina.Ameli
Wed Jan 22, 2020 8:35 am
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman,

Thank you so much for sending me the document for the offshore WT. I reduced the gains, then oscillations seem reduced a little like this:

GenSpeed.JPG
Generator Speed
GenSpeed.JPG (102.79 KiB) Viewed 1043 times

Generator Torque.JPG
Generator Troque
Generator Torque.JPG (97.43 KiB) Viewed 1043 times

Power.JPG
Power
Power.JPG (76.63 KiB) Viewed 1043 times


Thanks,
Best regards,
Sina
by Sina.Ameli
Tue Jan 21, 2020 9:24 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thanks for your reply. Actually, it is a simple PI control with a bias term that is exactly equal to the pitch angle at the operating point. However, let's get back to your PI control. Why is it settled very well for test 18 but not for test 24? Generator Speed_PI.PNG The PI contro...
by Sina.Ameli
Tue Jan 21, 2020 12:48 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thanks for replying to all of my question. Please see the following results for the rotor speed and control signal: RotorSpeed.JPG Pitch.JPG Pitch_Beginning.JPG The initial conditions are the operating condition (wind speed=22m/s, pitch=19.94 deg, rotor speed=1.267rad/s, Test 24). ...
by Sina.Ameli
Sat Jan 18, 2020 5:11 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thank for your reply. Actually, I have several questions. 1- Regarding the oscillations, you're right. You cannot tell anything about the those oscillations without having detailed information. Let me ask my question in other word. Suppose I apply the control input (pitch) in an op...
by Sina.Ameli
Fri Jan 17, 2020 3:05 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, When I apply a zero input (pitch angel is zero) fpr test 24, I will get this error message: An error occurred while running the simulation and the simulation was terminated Caused by: Error reported by S-function 'FAST_SFunc' in 'PI2_FAST/FAST Nonlinear Wind Turbine/S-Function': FA...
by Sina.Ameli
Tue Jan 14, 2020 2:04 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman,

Thank you so much. I got it.

Best regards,
Sina
by Sina.Ameli
Tue Jan 14, 2020 1:26 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman,

Thanks for responding me with celerity. So, how can I balance them? Do you mean because I deactivated structural degree of freedom it is unbalanced? Do you mean now the equilibrium points has changed due to changes of the dynamics?

Thanks,
Best regards,
Sina
by Sina.Ameli
Tue Jan 14, 2020 12:33 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thanks for your fast response. Yes, it makes sense. I corrected it. But there is a problem. Actually, the rotor speed does not stay at its initial value when I apply equilibrium points in it. It has a little steady-steady state error. It finally goes to 1.24 rad/s instead of the ra...
by Sina.Ameli
Tue Jan 14, 2020 8:42 am
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thanks for your prompt response. I return the DOF of the generator. But there is a problem. When I apply equilibrium points for the pitch and wind speed and with the initial condition in rotor speed at its rated value, then I expect that it stays in its rated value for the rotor sp...
by Sina.Ameli
Mon Jan 13, 2020 7:37 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thank you so much. Now, I can get a fixed and clean signal. But there is a big problem! When I apply different inputs (pitch angles) and different step wind inflows, I get the same rotor speed that is always equal to the initial condition! It seems that it plays as a gain of one th...
by Sina.Ameli
Mon Jan 13, 2020 10:40 am
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, Thanks for your reply. This my file that is NRELOffshrBsline5MW_OC3Hywind_AeroDyn15: ------- AERODYN v15.03.* INPUT FILE ------------------------------------------------ NREL 5.0 MW offshore baseline aerodynamic input properties. ====== General Options =============================...
by Sina.Ameli
Mon Jan 13, 2020 7:30 am
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman, I double-checked all of the comments you sent to me. It seems I followed whatever you advised me. Because there is only three files to be changed, I am putting them here, in case something does not set correctly: NRELOffshrBsline5MW_InflowWind_12mps: ------- InflowWind v3.01.* INPU...
by Sina.Ameli
Fri Jan 10, 2020 4:41 pm
Forum: Controls
Topic: Model verification
Replies: 51
Views: 4245

Re: Model verification

Dear Dr. Jonkman,

Thank you so much. I really appreciate it. Let me know when you got the correct results. Meanwhile, I am double-checking all the settings to see whether something sets incorrectly.

Thanks
Best regards,
Sina

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