## Search found 29 matches

Mon Jun 15, 2020 1:01 pm
Forum: Computer-Aided Engineering Software Tools
Topic: 10kW wind turbine power curve
Replies: 1
Views: 487

### 10kW wind turbine power curve

Dear Jason, I have plotted power-rotor speed for 10 kW wind turbine under 8m/s, 9 m/s, 10 m/s and 11.5 m/s wind speeds. The rated wind speed for this turbine is 11.5 m/s in which the power should reach maximum 10kW but in the figure it is less than 10 kW. Generator efficiency and gearbox efficiency ...
Tue Jun 02, 2020 11:53 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, Thanks for your reply. The solution 1 is just to verify optimal values of TSR and Cp. In different literatures, these values are TSR =5.6 and Cpmax = 0.42. So I have just included the files for solution 2. Please find in the attachment the files. 10kW wind turbine is considered. All DOFs...
Sun May 31, 2020 5:00 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, I want to do linearization around MPP. So I need to have the rotor speed at MPP and then do linearizations. --But how to find rotor speed at MPP? To do this, I find the optimal TSR and then calculate the rotor speed at MPP for its corresponding constant wind speed. The values are surely ...
Sat May 30, 2020 1:56 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, I don’t have two distinct models. At first I find the optimal value for the TSR and Cp of the turbine. Next I do the calculations in opposite direction: If I set that turbine to rotate at fixed optimal speed (for its corresponding wind speed) and I find the TSR and Cp values, they should...
Fri May 29, 2020 4:13 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason,

That is my question.
I run FAST at constant wind speed and corresponding rotor speed for TSR= 5.6. I disable all DOFs. But why the Cp is not maximum considering that the rotor speed is set to its value at MPP?

Best regards,
Babak
Fri May 29, 2020 3:13 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason,

My problem is exactly at this part as you said:
but then when you run specifically at 10 m/s and the corresponding rotor speed for TSR=5.6, you no longer get Cpmax = 0.42

Why this happens?

Kind regards,
Fri May 29, 2020 1:00 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, Thanks for your reply. For every wind speed, if I calculate the rotor speed according to the optimal value of the TSR and setting the pitch angle to its optimal value, I expect that the Cp to be its maximum value, right? So it does not depend on special wind speed. In other words, by for...
Fri May 29, 2020 12:31 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, In each of the turbines, I change the rotor speed according to the their optimal TSR value(which is 5.6 for 10kW and 7 for 1.5 MW) and different constant wind speeds. I expect that the Cp to be equal to its maximum value but it is not. For example in 10KW turbine (rotor radius = 2.9) Opt...
Fri May 29, 2020 11:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

And files for 1.5MW turbine: Primary: ------- FAST v8.16.* INPUT FILE ------------------------------------------------ FAST Certification Test #13: WindPACT 1.5 MW Baseline with many DOFs with VS and VP and FF turbulence. ---------------------- SIMULATION CONTROL ------------------------------------...
Fri May 29, 2020 11:49 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, The files of the 10kW turbine is as below (Wind speed is 10m/s), I will post 1.5MW turbine separately. --10kW Primary input file: ------- FAST v8.16.* INPUT FILE ------------------------------------------------ FAST Certification Test #17: SWRT 3-bladed upwind turbine with many DOFs, var...
Fri May 29, 2020 9:54 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, Sorry if my explanations were not clear enough. let me explain it as below: --At first, when we want to know the optimal value of TSR and Cpmax for every wind turbine, we disable all DOFs and obtain Cp value for different wind speeds and different pitch angle values. According to the Cp ...
Fri May 29, 2020 8:56 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, I have obtained the Cp surface for different TSR and pitch angle values. I already know that the optimal TSR is 5.6 and optimal pitch angle is 7.5 degrees and Cpmax is 0.422. In my previous post I obtained the optimal rotor speed for 10m/s wind speed and set it to my FAST input file as t...
Fri May 29, 2020 8:30 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, Thanks for your reply. I tried this: I disabled all DOFs and I set the rotor speed to its optimal value through equation below and setting the TSR to its optimal value = 5.6. TSR = Rotor radius * Rotor speed/wind speed Considering 10m/s wind speed, the optimal rotor speed is 184.4 rpm. I...
Fri May 29, 2020 3:29 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, Thanks for your helps. I searched the forum about the linearization and in one of your posts you have mentioned: Cq (torque coefficient) usually reaches a maximum at a TSR slightly below the TSR for optimal power coefficient (Cp) for a given blade-pitch angle. Please let me know, can it ...
Wed May 27, 2020 3:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization issue using Fast V7.02
Replies: 114
Views: 23536

### Re: Linearization issue using Fast V7.02

Dear Jason, Thanks for your reply. The values for optimal TSR and pitch angle are correct. Generator torque has trimmed to obtain the linearized model of the turbine at the optimal rotational speed (MPP). Only GenDOF is active. The rated wind speed for 10kW wind turbine is 11.5 m/s so If we lineariz...