Search found 26 matches

by Zhe.Zhang
Mon Mar 23, 2020 8:16 am
Forum: Controls
Topic: Blade pitch control
Replies: 26
Views: 9227

Re: Blade pitch control

Dear Dr. Jonkman
Does the value of 'QD_GeAz' (Velocity of variable speed generator DOF) indicate the generator speed, but through my comparison in simulink, they are not the same.
Thanks
by Zhe.Zhang
Mon Mar 23, 2020 8:02 am
Forum: Controls
Topic: Blade pitch control
Replies: 26
Views: 9227

Re: Blade pitch control

Dear Dr. Jonkman'
Do you mean that I'd better use the form 'u (strmatch (' QD_GeAz ', OutList))' when extracting the state related to the derivative?
Thanks
by Zhe.Zhang
Mon Mar 23, 2020 7:03 am
Forum: Controls
Topic: Blade pitch control
Replies: 26
Views: 9227

Re: Blade pitch control

Dear Dr. Jonkman, I'm designing a pitch controller and I need to know the state of the wind turbine. Based on the degrees of freedom I set, I extracted Q_GeAz and QD_GeAz from the output, which represents the Displacement of variable speed generator DOF and Velocity of variable speed generator DOF, ...
by Zhe.Zhang
Fri Mar 20, 2020 10:58 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason,
I modified the parameters of my controller and got the following comparison results. What I don't understand is why the non-linear model fluctuates sharply at the initial moment. Is this a normal phenomenon? What do you think of this comparison result?
sincerely yours,
Zhe.Zhang
by Zhe.Zhang
Fri Mar 20, 2020 1:44 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason
Thank you very much for your patience for answering, it is really because of the unit of the controller.
sincerely yours,
Zhe.Zhang
by Zhe.Zhang
Thu Mar 19, 2020 7:50 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason
I noticed that the pitch angle of the linear model changes slowly at the time of wind speed change. Is this related to the pitch rate setting in fast7? This value can be set in PitManRat in fast8, but how can I change this in Fast v7?
by Zhe.Zhang
Wed Mar 18, 2020 8:38 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Dr. Jonkman, As you said, I only enabled one degree of freedom, but the differences are still large. Are these differences due to different versions? I only use fast7 for linear calculations, but I use fast8 for non-linear models. If it is not a version problem, why is there such a difference? ...
by Zhe.Zhang
Wed Mar 18, 2020 7:23 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason, I compared the linearized model with the non-linear model through matlab. The input wind file was a step wind that changed from 17m / s to 19m / s at 150s. The relevant documents and comparison results are in the annex.my question is 1. Why is the result of rotspeed slightly different, i...
by Zhe.Zhang
Tue Mar 17, 2020 7:30 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason,
I want to compare the linearized model calculated from fast7 with the fast8 nonlinear model in matlab software. Do I need to set their degrees of freedom to be consistent?

Thanks
by Zhe.Zhang
Tue Mar 17, 2020 3:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: Wind & Wave data
Replies: 64
Views: 28405

Re: Wind & Wave data

Dear Jason,
I use a turbulent wind file when the input program can run successfully, but when I change to a uniform wind file program, an error is reported, can you help me explain it?
by Zhe.Zhang
Mon Mar 16, 2020 4:45 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason, I am using the fast7 linearization function to get the state space model of the TLP type floating wind turbine, and compare it with the fast8 non-linear model. Both the linear model and the non-linear model use pi control. The two models are compared using a turbulent wind of 18 m / s. T...
by Zhe.Zhang
Sat Oct 26, 2019 8:36 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason,
I want to verify the linear model. The same wind velocity is input to the linear model as in FAST nonlinear simulations. The mean wind velocity is 16 m/s and the turbulence intensity is about 0.0564,How to set up the disturbance in simulink?
by Zhe.Zhang
Thu Oct 24, 2019 8:08 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason, Before the azimuth averaging of the matrix, I have used MBC and obtained six matrices of MBC_AvgA, MBC_AvgB, MBC_AvgBd, MBC_AvgC, MBC_AvgD, and MBC_AvgDd.But I don't understand the elimination of the first column of matrix MBC_AvgA and the first column of MBC_AvgC, Do I need to close a d...
by Zhe.Zhang
Thu Oct 24, 2019 4:59 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

Dear Jason,
I use the GetMats command to obtain the six matrices of AvgAMat, AvgBMat, AvgBdMat, AvgCMat, AvgDMat, and AvgDdMat as the coefficient matrix of the state space model. The mbc3 command can only get the MBC_AvgA matrix. Should I modify the mbc3 file?
Best regards,
by Zhe.Zhang
Wed Oct 23, 2019 9:29 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 110
Views: 11943

Re: Linearization issue using Fast V7.02

NRELOffshrBsline5MW_Floating_TLP.lin.docx Dear Jason, According to your suggestion, I added controller and disturbance input to the state space model, but the simulation results are very different from what I expected. I suspect that my FAST linearization is wrong. Can you help me? QQ截图201910241126...

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