OpenFAST
Problems encountered in modelling IEA 15MW
Dear Professor
I am experiencing the following problem when simulating the IEA 15MW wind turbine model Before, I tried to use the turbulent wind field generated by TurbSim as the inlet condition, and set the rated wind speed at 150m to 10.59m/s, but I found that the power didn't reach 15MW, so I tried to use the steady state inlet, and also set the steady wind speed at 150m to 12m/s, but the result still didn't reach 15MW, and I also set the wind turbine's initial speed to 7.55rpm, turned off the platform's degrees of freedom, and I don't know why the simulation result still didn't reach the manual's requirement. I also set 7.55rpm initial rotational speed of the wind turbine and closed the platform's degree of freedom, I don't know why the simulation result still can't reach the requirement of the manual, I hope you can help me to answer this doubt, thank you. Here are the simulation results, the red colour is power, the blue colour is rotational speed of the wind turbine, and the green colour is wind speed.
Dear @tianmou-dr,
Are you using the OpenFAST model of the IEA Wind 15-MW RWT available from its repository: https://github.com/IEAWindTask37/IEA-15-240-RWT/tree/master/OpenFAST/IEA-15-240-RWT-Monopile? Did you change anything in this model other than the wind speed and rotor speed and disabling the platform DOFs in ElastoDyn?
In addition to wind speed, rotor speed, and power, what do blade pitch, blade deflection, and tower deflection look like?
Best regards,
Dear Professor
I didn't use the model you mentioned, I used the https://github.com/IEAWindTask37/IEA-15-240-RWT/tree/master/OpenFAST/IEA-15-240-RWT-UMaineSemi。At the same time I didn't change any other parameters except the ones you mentioned.
The blade pitch is shown below。
Below in red is the YawBrTDyt、Green is YawBrTDxt
Daer @tianmou-dr,
Perhaps the issue is that your initial blade-pitch angle is not consistent with the wind speed you are using? According to Figure 3-1 in the IEA Wind 15-MW RWT specifications document, at 12 m/s, the blade-pitch angle should be closer to 5 deg. Not using proper initial conditions of rotor speed and blade pitch can often confuse the controller, which can take a long time to recover.
Best regards,
Dear everyone, I'm sorry that I can't reply now due to personal reasons and I would like to start by expressing my gratitude to all of you. In the last few days I've tried to make the changes as per your comments, but the results are still not impressive. I have turned off the freedom of the platform and the incoming wind is set to constant wind 10.59m/s, it is logical that my wind turbine rotation speed should remain at 7.55rpm and the power is stable at around 15MW, but at the moment the power can remain stable at around 14.8MW but the rotation speed stays at 6.8rmp, I would like to ask you all what this is caused by.
Hi,
There are losses in the model that could be causing the reduction in power. I recommend reviewing the IEA-15MW repository for previous discussions there.
I also recommend starting with a pre-existing model and changing as little as possible. A comparison of the power curve you are seeing versus the report would be more helpful than a single point simulation. The power can be very sensitive near rated. It could be that only a little more wind would reach the rated 15 MW.
Additionally, the IEA-15MW model has changed since the report was released, so there may be small discrepancies between the latest model and the report. If there are large discrepancies, it would be good to document them.
The results you have posted so far seem reasonable to me. The only thing that is concerning to me is the NaN next to Est. wind speed:. I don't think that should ever be the case using the latest version of the ROSCO controller. What DISCON input and ROSCO version are you using?
Best, Dan
Hello I'm using controller version 3.2, I would try other versions before but there was always some error that prevented it from working. Also, I tried using the latest 15MW model and although I used the latest ROSCO controller, it resulted in 0 power output.