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IEAWindTask37 / IEA-22-280-RWT

Repository for the IEA 22-MW offshore reference wind turbine developed by the IEA Wind Task 55 REFWIND
Apache License 2.0
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Pitch control issue #86

Closed UmayerH closed 1 day ago

UmayerH commented 3 weeks ago

Hi all,

I am running a simulation under a turbulent wind with a mean wind speed of 11.5 m/s and I am noticing that the turbine is not pitching correctly. I am expecting that the turbine pitches to maintain the rated power but this is not happening. I have set the initial conditions for pitch and rotor speed to the values that are expected to be close to the mean wind speed and have set the following DOF to True:

FlapDOF1 FlapDOF2 EdgeDOF GenDOF TwFADOF1 TwFADOF2 TwSSDOF1
TwSSDOF2

Are there any suggestions? I am also receiving the following messages:

OpenFAST

Copyright (C) 2023 National Renewable Energy Laboratory Copyright (C) 2023 Envision Energy USA LTD

This program is licensed under Apache License Version 2.0 and comes with ABSOLUTELY NO WARRANTY. See the "LICENSE" file distributed with this software for details.

OpenFAST-v3.5.1 Compile Info:

OpenFAST input file heading: Generated with AeroElasticSE FAST driver

Running ElastoDyn. Nodal outputs section of ElastoDyn input file not found or improperly formatted. Running BeamDyn. Nodal outputs section of BeamDyn input file not found or improperly formatted. Running BeamDyn. Nodal outputs section of BeamDyn input file not found or improperly formatted. Running BeamDyn. Nodal outputs section of BeamDyn input file not found or improperly formatted. Running AeroDyn. AD15 Nodal Outputs: Nodal output section of AeroDyn input file not found or improperly formatted. Skipping nodal outputs. Running InflowWind.

Reading a 35x35 grid (340 m wide, 0 m to 340 m above ground) with a characteristic wind speed of 11.458 m/s.

Processed 2800 time steps of 4-Hz full-field data (699.75 seconds). Running ServoDyn. Running ServoDyn Interface for Bladed Controllers (using Intel Visual Fortran for Windows). Using legacy Bladed DLL interface.

FAST_InitializeAll:BD_Init:BD_ValidateInputData:Damping values in blade file are not of similar order of magnitude. BeamDyn may not converge! FAST_InitializeAll:BD_Init:BD_ValidateInputData:Damping values in blade file are not of similar order of magnitude. BeamDyn may not converge! FAST_InitializeAll:BD_Init:BD_ValidateInputData:Damping values in blade file are not of similar order of magnitude. BeamDyn may not converge!

Time: 0 of 400 seconds.

Running ROSCO-v2.8.0 A wind turbine controller framework for public use in the scientific field
Developed in collaboration: National Renewable Energy Laboratory
Delft University of Technology, The Netherlands

Generator speed: 7.0 RPM, Pitch angle: 3.6 deg, Power: 0.0 kW, Est. wind Speed: 10.7 m/s

FAST_Solution0:CalcOutputs_And_SolveForInputs:SolveOption2:AD_CalcOutput:RotCalcOutput:BEMT_CalcOu tput(node 3, blade 1):UA_CalcOutput:UA_BlendSteady:Temporarily turning off UA due to high angle of attack or low relative velocity. This warning will not be repeated though the condition may persist.

FAST_Solution:FAST_AdvanceStates:SrvD_UpdateStates:DLL_controller_call:BladedInterface option was designed for an explicit-loose coupling scheme. Using last calculated values from DLL on all subsequent calls until time is advanced. Warning will not be displayed again.

FAST_Solution:FAST_AdvanceStates:AD_UpdateStates:BEMT_UpdateStates(node 1, blade 1):ComputeTau:Rotor-averaged axial induction factor is greater than 0.5; limiting time-varying tau1. This message will not be repeated though the condition may persist.

bld1pitch genspeed

ptrbortolotti commented 3 weeks ago

Hello, I attach the files that I generated to run turbulent wind at 11 m/s. Try comparing files and see what's different. I hope this helps.

github.zip

best regards, Pietro

ptrbortolotti commented 3 weeks ago

Unfortunately the wind files are too large for GitHub, and I uploaded them on retransfer https://we.tl/t-lmAeV5G0SA

UmayerH commented 3 weeks ago

Unfortunately the wind files are too large for GitHub, and I uploaded them on retransfer https://we.tl/t-lmAeV5G0SA

Hi Pietro,

Thank you for sharing your files. I just have a question about your Aerodyn file, I see you set WakeMode=11. Is this a typo or is this really a feature in Openfast? I don't see this in the manual.

ptrbortolotti commented 3 weeks ago

it is a real feature, it will be documented soon. It's a new implementation of the BEM performed by my former colleague Emmanuel Branlard. You can also set WakeMod=1, results for this rotor won't change a whole lot

UmayerH commented 3 weeks ago

I see. Thank you for your suggestion however I have one question. I am simulating under a turbulent wind and so that's why I don't think using steady BEM is suitable, could you explain why is it ok to use WakeMod=1 like you suggested?

ptrbortolotti commented 3 weeks ago

From OpenFAST documentation:

Set WakeMod to 0 if you want to disable rotor wake/induction effects or 1 to include these effects using the (quasi-steady) BEM theory model. When WakeMod is set to 2, a dynamic BEM theory model (DBEMT) is used (also referred to as dynamic inflow or dynamic wake model, see Section 4.2.1.7.2). When WakeMod is set to 3, the free vortex wake model is used, also referred to as OLAF (see Section 4.2.2). WakeMod cannot be set to 2 or 3 during linearization analyses.

The new implementation applies to WakeMod 1 and 2, and can be activated by setting WakeMod to 11 or 12. I did see some convergence issues with WakeMod = 12 (we have not yet had the time to investigate the issue) but you are good to run WakeMod = 2.