Search found 7 matches

by Peter.Veldman
Wed May 05, 2021 12:51 pm
Forum: Controls
Topic: Tuning ROSCO controller with DISCON.IN
Replies: 3
Views: 609

Re: Tuning ROSCO controller with DISCON.IN

Dear Nikhar, Thanks a lot for your reply. Like you recommended I continued to modify the floating feedback gain (Fl_Kp term). To investigate the ROSCO controller behavior on the floating system for different floating feedback gains, I performed platform pitch decay tests in constant wind and calm wa...
by Peter.Veldman
Fri Apr 30, 2021 9:37 am
Forum: Controls
Topic: Tuning ROSCO controller with DISCON.IN
Replies: 3
Views: 609

Tuning ROSCO controller with DISCON.IN

Dear NREL team, I am running aero-hydro-servo-elastic simulations of the 15MW NREL offshore reference wind turbine, using specific aero-elastic and hydrodynamic software. The aero-elastic software I use supports the bladed-style communication interface. Therefore I am using the ROSCO controller vers...
by Peter.Veldman
Mon Mar 01, 2021 2:28 am
Forum: Structural Analysis
Topic: Discrepancy RtAeroFxh and YawBrFxp
Replies: 2
Views: 598

Re: Discrepancy RtAeroFxh and YawBrFxp

Dear Jason, Indeed, when I eliminate the shaft tilt (ShftTilt = 0) I get the expected result that RtAeroFxp equates to YawBrFxp. I guess I was concentrating too much on the RtAeroFxp while the RtAeroFyp and specifically the RtAeroFzp is contributing to the YawBrFxp as well due to the shaft tilt. The...
by Peter.Veldman
Fri Feb 26, 2021 2:51 am
Forum: Structural Analysis
Topic: Discrepancy RtAeroFxh and YawBrFxp
Replies: 2
Views: 598

Discrepancy RtAeroFxh and YawBrFxp

Dear NREL team, I am investigating the loads on the yaw bearing of the 15MW NREL reference turbine for a parked condition (not idling). For simplicity I neglected the floater motions and structural deformations of the wind turbine tower and wind turbine blades. I am running a simulation in a 52.1 m/...
by Peter.Veldman
Fri Jan 29, 2021 2:36 am
Forum: Controls
Topic: 15MW control behaviour rated wind
Replies: 2
Views: 685

Re: 15MW control behaviour rated wind

Dear Nikhar, Thanks a lot for quick and helpful reply. The controller that I was using from https://github.com/IEAWindTask37/IEA-15-240-RWT/tree/master/OpenFAST/IEA-15-240-RWT-UMaineSemi/ServoData turned out to be outdated, indeed. Re-running the simulations with ROSCO v2.1.1 resulted in the expecte...
by Peter.Veldman
Tue Jan 26, 2021 12:41 pm
Forum: Structural Analysis
Topic: 15MW towerbase pitching moment discrepancy
Replies: 1
Views: 576

15MW towerbase pitching moment discrepancy

Dear NREL team, I am running openFAST simulations for the 15-MW reference wind turbine including wind turbine control (for floating applications) with a fully constrained floater and ignoring structural deformations of the wind turbine tower and wind turbine blades. Also, the tower drag loads are no...
by Peter.Veldman
Tue Jan 26, 2021 11:24 am
Forum: Controls
Topic: 15MW control behaviour rated wind
Replies: 2
Views: 685

15MW control behaviour rated wind

Dear NREL team, I am running an openFAST simulation of the 15-MW offshore reference turbine in an under rated, rated and above rated turbulent condition (8, 10.6 and 14 m/s) generated with the use of Turbsim (V2.00.08 64-bit). For verification purposes, I fixed all translations and rotations of the ...

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