Aerogenerator won't give any power

Hello everyone,

I’m currently working on a semisubmersible platform project in which I am using FAST, however, when I simulate any situation I always get GenPwr=0 and GenTq=0.
This is strange because I do get results for Generator speed and rotor speed, so it doesn’t make any sense to me that if I can get those two results I can’t get any power in the ouput. I also get results for deformations and tensions.

I am using Fast 7. My .fst looks like this:

---------------------- FEATURE FLAGS -------------------------------------------
True FlapDOF1 - First flapwise blade mode DOF (flag)
True FlapDOF2 - Second flapwise blade mode DOF (flag)
True EdgeDOF - First edgewise blade mode DOF (flag)
True TeetDOF - Rotor-teeter DOF (flag) [unused for 3 blades]
False DrTrDOF - Drivetrain rotational-flexibility DOF (flag)
True GenDOF - Generator DOF (flag)
True YawDOF - Yaw DOF (flag)
True TwFADOF1 - First fore-aft tower bending-mode DOF (flag)
True TwFADOF2 - Second fore-aft tower bending-mode DOF (flag)
True TwSSDOF1 - First side-to-side tower bending-mode DOF (flag)
True TwSSDOF2 - Second side-to-side tower bending-mode DOF (flag)
True CompAero - Compute aerodynamic forces (flag)
False CompNoise - Compute aerodynamic noise (flag)

If GenDOF is true, why do I not get results?

Also, when I set every term to True except for CompNoise I get several errores which won’t even let me get any resultas at all, such as the ones regarding ‘Supersonic blade behaviours’ and ‘Quasi-static catenary routine’ issues.

What can I do?
Thanks in advance to anyone willing to help me,

Carmen

GenTq can be set a number of ways, external controller, default control law, slip curve, can you paste the entire FST file?

Hi Paul, thank you for your reply, this is the .fst:


------- FAST INPUT FILE --------------------------------------------------------
NREL 5.0 MW Baseline Wind Turbine for Use in Offshore Analysis.
Properties from Dutch Offshore Wind Energy Converter (DOWEC) 6MW Pre-Design (10046_009.pdf) and REpower 5M 5MW (5m_uk.pdf); Compatible with FAST v7.02.
---------------------- SIMULATION CONTROL --------------------------------------
False Echo - Echo input data to “echo.out” (flag)
1 ADAMSPrep - ADAMS preprocessor mode {1: Run FAST, 2: use FAST as a preprocessor to create an ADAMS model, 3: do both} (switch)
1 AnalMode - Analysis mode {1: Run a time-marching simulation, 2: create a periodic linearized model} (switch)
3 NumBl - Number of blades (-)
3600.0 TMax - Total run time (s)
0.005 DT - Integration time step (s)
---------------------- TURBINE CONTROL -----------------------------------------
0 YCMode - Yaw control mode {0: none, 1: user-defined from routine UserYawCont, 2: user-defined from Simulink/Labview} (switch)
9999.9 TYCOn - Time to enable active yaw control (s) [unused when YCMode=0]
1 PCMode - Pitch control mode {0: none, 1: user-defined from routine PitchCntrl, 2: user-defined from Simulink/Labview} (switch)
0.0 TPCOn - Time to enable active pitch control (s) [unused when PCMode=0]
2 VSContrl - Variable-speed control mode {0: none, 1: simple VS, 2: user-defined from routine UserVSCont, 3: user-defined from Simulink/Labview} (switch)
9999.9 VS_RtGnSp - Rated generator speed for simple variable-speed generator control (HSS side) (rpm) [used only when VSContrl=1]
9999.9 VS_RtTq - Rated generator torque/constant generator torque in Region 3 for simple variable-speed generator control (HSS side) (N-m) [used only when VSContrl=1]
9999.9 VS_Rgn2K - Generator torque constant in Region 2 for simple variable-speed generator control (HSS side) (N-m/rpm^2) [used only when VSContrl=1]
9999.9 VS_SlPc - Rated generator slip percentage in Region 2 1/2 for simple variable-speed generator control (%) [used only when VSContrl=1]
2 GenModel - Generator model {1: simple, 2: Thevenin, 3: user-defined from routine UserGen} (switch) [used only when VSContrl=0]
True GenTiStr - Method to start the generator {T: timed using TimGenOn, F: generator speed using SpdGenOn} (flag)
True GenTiStp - Method to stop the generator {T: timed using TimGenOf, F: when generator power = 0} (flag)
9999.9 SpdGenOn - Generator speed to turn on the generator for a startup (HSS speed) (rpm) [used only when GenTiStr=False]
0.0 TimGenOn - Time to turn on the generator for a startup (s) [used only when GenTiStr=True]
9999.9 TimGenOf - Time to turn off the generator (s) [used only when GenTiStp=True]
1 HSSBrMode - HSS brake model {1: simple, 2: user-defined from routine UserHSSBr, 3: user-defined from Labview} (switch)
9999.9 THSSBrDp - Time to initiate deployment of the HSS brake (s)
9999.9 TiDynBrk - Time to initiate deployment of the dynamic generator brake [CURRENTLY IGNORED] (s)
9999.9 TTpBrDp(1) - Time to initiate deployment of tip brake 1 (s)
9999.9 TTpBrDp(2) - Time to initiate deployment of tip brake 2 (s)
9999.9 TTpBrDp(3) - Time to initiate deployment of tip brake 3 (s) [unused for 2 blades]
9999.9 TBDepISp(1) - Deployment-initiation speed for the tip brake on blade 1 (rpm)
9999.9 TBDepISp(2) - Deployment-initiation speed for the tip brake on blade 2 (rpm)
9999.9 TBDepISp(3) - Deployment-initiation speed for the tip brake on blade 3 (rpm) [unused for 2 blades]
9999.9 TYawManS - Time to start override yaw maneuver and end standard yaw control (s)
9999.9 TYawManE - Time at which override yaw maneuver reaches final yaw angle (s)
0.0 NacYawF - Final yaw angle for yaw maneuvers (degrees)
9999.9 TPitManS(1) - Time to start override pitch maneuver for blade 1 and end standard pitch control (s)
9999.9 TPitManS(2) - Time to start override pitch maneuver for blade 2 and end standard pitch control (s)
9999.9 TPitManS(3) - Time to start override pitch maneuver for blade 3 and end standard pitch control (s) [unused for 2 blades]
9999.9 TPitManE(1) - Time at which override pitch maneuver for blade 1 reaches final pitch (s)
9999.9 TPitManE(2) - Time at which override pitch maneuver for blade 2 reaches final pitch (s)
9999.9 TPitManE(3) - Time at which override pitch maneuver for blade 3 reaches final pitch (s) [unused for 2 blades]
0.0 BlPitch(1) - Blade 1 initial pitch (degrees)
0.0 BlPitch(2) - Blade 2 initial pitch (degrees)
0.0 BlPitch(3) - Blade 3 initial pitch (degrees) [unused for 2 blades]
0.0 BlPitchF(1) - Blade 1 final pitch for pitch maneuvers (degrees)
0.0 BlPitchF(2) - Blade 2 final pitch for pitch maneuvers (degrees)
0.0 BlPitchF(3) - Blade 3 final pitch for pitch maneuvers (degrees) [unused for 2 blades]
---------------------- ENVIRONMENTAL CONDITIONS --------------------------------
9.80665 Gravity - Gravitational acceleration (m/s^2)
---------------------- FEATURE FLAGS -------------------------------------------
True FlapDOF1 - First flapwise blade mode DOF (flag)
True FlapDOF2 - Second flapwise blade mode DOF (flag)
True EdgeDOF - First edgewise blade mode DOF (flag)
True TeetDOF - Rotor-teeter DOF (flag) [unused for 3 blades]
True DrTrDOF - Drivetrain rotational-flexibility DOF (flag)
True GenDOF - Generator DOF (flag)
True YawDOF - Yaw DOF (flag)
True TwFADOF1 - First fore-aft tower bending-mode DOF (flag)
True TwFADOF2 - Second fore-aft tower bending-mode DOF (flag)
True TwSSDOF1 - First side-to-side tower bending-mode DOF (flag)
True TwSSDOF2 - Second side-to-side tower bending-mode DOF (flag)
True CompAero - Compute aerodynamic forces (flag)
False CompNoise - Compute aerodynamic noise (flag)
---------------------- INITIAL CONDITIONS --------------------------------------
0.0 OoPDefl - Initial out-of-plane blade-tip displacement (meters)
0.0 IPDefl - Initial in-plane blade-tip deflection (meters)
0.0 TeetDefl - Initial or fixed teeter angle (degrees) [unused for 3 blades]
0.0 Azimuth - Initial azimuth angle for blade 1 (degrees)
0.0 RotSpeed - Initial or fixed rotor speed (rpm)
0.0 NacYaw - Initial or fixed nacelle-yaw angle (degrees)
0.0 TTDspFA - Initial fore-aft tower-top displacement (meters)
0.0 TTDspSS - Initial side-to-side tower-top displacement (meters)
---------------------- TURBINE CONFIGURATION -----------------------------------
63.0 TipRad - The distance from the rotor apex to the blade tip (meters)
1.5 HubRad - The distance from the rotor apex to the blade root (meters)
1 PSpnElN - Number of the innermost blade element which is still part of the pitchable portion of the blade for partial-span pitch control [1 to BldNodes] [CURRENTLY IGNORED] (-)
0.0 UndSling - Undersling length [distance from teeter pin to the rotor apex] (meters) [unused for 3 blades]
0.0 HubCM - Distance from rotor apex to hub mass [positive downwind] (meters)
-5.01910 OverHang - Distance from yaw axis to rotor apex [3 blades] or teeter pin [2 blades] (meters)
1.9 NacCMxn - Downwind distance from the tower-top to the nacelle CM (meters)
0.0 NacCMyn - Lateral distance from the tower-top to the nacelle CM (meters)
1.75 NacCMzn - Vertical distance from the tower-top to the nacelle CM (meters)
87.6 TowerHt - Height of tower above ground level [onshore] or MSL [offshore] (meters)
1.96256 Twr2Shft - Vertical distance from the tower-top to the rotor shaft (meters)
0.0 TwrRBHt - Tower rigid base height (meters)
-5.0 ShftTilt - Rotor shaft tilt angle (degrees)
0.0 Delta3 - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
-2.5 PreCone(1) - Blade 1 cone angle (degrees)
-2.5 PreCone(2) - Blade 2 cone angle (degrees)
-2.5 PreCone(3) - Blade 3 cone angle (degrees) [unused for 2 blades]
0.0 AzimB1Up - Azimuth value to use for I/O when blade 1 points up (degrees)
---------------------- MASS AND INERTIA ----------------------------------------
0.0 YawBrMass - Yaw bearing mass (kg)
240.00E+3 NacMass - Nacelle mass (kg)
56.78E+3 HubMass - Hub mass (kg)
0.0 TipMass(1) - Tip-brake mass, blade 1 (kg)
0.0 TipMass(2) - Tip-brake mass, blade 2 (kg)
0.0 TipMass(3) - Tip-brake mass, blade 3 (kg) [unused for 2 blades]
2607.89E+3 NacYIner - Nacelle inertia about yaw axis (kg m^2)
534.116 GenIner - Generator inertia about HSS (kg m^2)
115.926E+3 HubIner - Hub inertia about rotor axis [3 blades] or teeter axis [2 blades] (kg m^2)
---------------------- DRIVETRAIN ----------------------------------------------
100.0 GBoxEff - Gearbox efficiency (%)
94.4 GenEff - Generator efficiency [ignored by the Thevenin and user-defined generator models] (%)
1.0 GBRatio - Gearbox ratio (-)
False GBRevers - Gearbox reversal {T: if rotor and generator rotate in opposite directions} (flag)
28.1162E+3 HSSBrTqF - Fully deployed HSS-brake torque (N-m)
0.6 HSSBrDT - Time for HSS-brake to reach full deployment once initiated (sec) [used only when HSSBrMode=1]
“Dummy” DynBrkFi - File containing a mech-gen-torque vs HSS-speed curve for a dynamic brake [CURRENTLY IGNORED] (quoted string)
867.637E+6 DTTorSpr - Drivetrain torsional spring (N-m/rad)
6.215E+6 DTTorDmp - Drivetrain torsional damper (N-m/(rad/s))
---------------------- SIMPLE INDUCTION GENERATOR ------------------------------
9999.9 SIG_SlPc - Rated generator slip percentage (%) [used only when VSContrl=0 and GenModel=1]
9999.9 SIG_SySp - Synchronous (zero-torque) generator speed (rpm) [used only when VSContrl=0 and GenModel=1]
9999.9 SIG_RtTq - Rated torque (N-m) [used only when VSContrl=0 and GenModel=1]
9999.9 SIG_PORt - Pull-out ratio (Tpullout/Trated) (-) [used only when VSContrl=0 and GenModel=1]
---------------------- THEVENIN-EQUIVALENT INDUCTION GENERATOR -----------------
9999.9 TEC_Freq - Line frequency [50 or 60] (Hz) [used only when VSContrl=0 and GenModel=2]
9998 TEC_NPol - Number of poles [even integer > 0] (-) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_SRes - Stator resistance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_RRes - Rotor resistance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_VLL - Line-to-line RMS voltage (volts) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_SLR - Stator leakage reactance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_RLR - Rotor leakage reactance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_MR - Magnetizing reactance (ohms) [used only when VSContrl=0 and GenModel=2]
---------------------- PLATFORM ------------------------------------------------
3 PtfmModel - Platform model {0: none, 1: onshore, 2: fixed bottom offshore, 3: floating offshore} (switch)
“Semisub_Platform.dat” PtfmFile - Name of file containing platform properties (quoted string) [unused when PtfmModel=0]
---------------------- TOWER ---------------------------------------------------
20 TwrNodes - Number of tower nodes used for analysis (-)
“Semisub_Tower.dat” TwrFile - Name of file containing tower properties (quoted string)
---------------------- NACELLE-YAW ---------------------------------------------
9028.32E+6 YawSpr - Nacelle-yaw spring constant (N-m/rad)
19.16E+6 YawDamp - Nacelle-yaw damping constant (N-m/(rad/s))
0.0 YawNeut - Neutral yaw position–yaw spring force is zero at this yaw (degrees)
---------------------- FURLING -------------------------------------------------
False Furling - Read in additional model properties for furling turbine (flag)
“Dummy” FurlFile - Name of file containing furling properties (quoted string) [unused when Furling=False]
---------------------- ROTOR-TEETER --------------------------------------------
0 TeetMod - Rotor-teeter spring/damper model {0: none, 1: standard, 2: user-defined from routine UserTeet} (switch) [unused for 3 blades]
0.0 TeetDmpP - Rotor-teeter damper position (degrees) [used only for 2 blades and when TeetMod=1]
0.0 TeetDmp - Rotor-teeter damping constant (N-m/(rad/s)) [used only for 2 blades and when TeetMod=1]
0.0 TeetCDmp - Rotor-teeter rate-independent Coulomb-damping moment (N-m) [used only for 2 blades and when TeetMod=1]
0.0 TeetSStP - Rotor-teeter soft-stop position (degrees) [used only for 2 blades and when TeetMod=1]
0.0 TeetHStP - Rotor-teeter hard-stop position (degrees) [used only for 2 blades and when TeetMod=1]
0.0 TeetSSSp - Rotor-teeter soft-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
0.0 TeetHSSp - Rotor-teeter hard-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
---------------------- TIP-BRAKE -----------------------------------------------
0.0 TBDrConN - Tip-brake drag constant during normal operation, CdArea (m^2)
0.0 TBDrConD - Tip-brake drag constant during fully-deployed operation, Cd
Area (m^2)
0.0 TpBrDT - Time for tip-brake to reach full deployment once released (sec)
---------------------- BLADE ---------------------------------------------------
“Semisub_Blade.dat” BldFile(1) - Name of file containing properties for blade 1 (quoted string)
“Semisub_Blade.dat” BldFile(2) - Name of file containing properties for blade 2 (quoted string)
“Semisub_Blade.dat” BldFile(3) - Name of file containing properties for blade 3 (quoted string) [unused for 2 blades]
---------------------- AERODYN -------------------------------------------------
“Semisub_AeroDyn.ipt” ADFile - Name of file containing AeroDyn input parameters (quoted string)
---------------------- NOISE ---------------------------------------------------
“Dummy” NoiseFile - Name of file containing aerodynamic noise input parameters (quoted string) [used only when CompNoise=True]
---------------------- ADAMS ---------------------------------------------------
“Semisub_ADAMSSpecific.dat” ADAMSFile - Name of file containing ADAMS-specific input parameters (quoted string) [unused when ADAMSPrep=1]
---------------------- LINEARIZATION CONTROL -----------------------------------
“Semisub_Linear.dat” LinFile - Name of file containing FAST linearization parameters (quoted string) [unused when AnalMode=1]
---------------------- OUTPUT --------------------------------------------------
True SumPrint - Print summary data to “.fsm” (flag)
1 OutFileFmt - Format for tabular (time-marching) output file(s) (1: text file [.out], 2: binary file [.outb], 3: both) (switch)
True TabDelim - Use tab delimiters in text tabular output file? (flag)
“ES10.3E2” OutFmt - Format used for text tabular output (except time). Resulting field should be 10 characters. (quoted string) [not checked for validity!]
0.0 TStart - Time to begin tabular output (s)
100 DecFact - Decimation factor for tabular output {1: output every time step} (-)
1.0 SttsTime - Amount of time between screen status messages (sec)
-3.09528 NcIMUxn - Downwind distance from the tower-top to the nacelle IMU (meters)
0.0 NcIMUyn - Lateral distance from the tower-top to the nacelle IMU (meters)
2.23336 NcIMUzn - Vertical distance from the tower-top to the nacelle IMU (meters)
1.912 ShftGagL - Distance from rotor apex [3 blades] or teeter pin [2 blades] to shaft strain gages [positive for upwind rotors] (meters)
1 NTwGages - Number of tower nodes that have strain gages for output [0 to 9] (-)
10 TwrGagNd - List of tower nodes that have strain gages [1 to TwrNodes] (-) [unused if NTwGages=0]
1 NBlGages - Number of blade nodes that have strain gages for output [0 to 9] (-)
9 BldGagNd - List of blade nodes that have strain gages [1 to BldNodes] (-) [unused if NBlGages=0]
OutList - The next line(s) contains a list of output parameters. See OutList.txt for a listing of available output channels, (-)
“WindVxi , WindVyi , WindVzi” - Longitudinal, lateral, and vertical wind speeds
“WaveElev” - Wave elevation at the platform reference point
“Wave1Vxi , Wave1Vyi , Wave1Vzi” - Longitudinal, lateral, and vertical wave particle velocities at platform node 1 (approx. platform reference point)
“Wave1Axi , Wave1Ayi , Wave1Azi” - Longitudinal, lateral, and vertical wave particle accelerations at platform node 1 (approx. platform reference point)
“GenPwr , GenTq” - Electrical generator power and torque
“HSSBrTq” - High-speed shaft brake torque
“BldPitch1, BldPitch2, BldPitch3” - Pitch angles for blades 1, 2, and 3
“Azimuth” - Blade 1 azimuth angle
“RotSpeed , GenSpeed” - Low-speed shaft and high-speed shaft speeds
“NacYaw , NacYawErr” - Nacelle yaw angle and nacelle yaw error estimate
“OoPDefl1 , IPDefl1 , TwstDefl1” - Blade 1 out-of-plane and in-plane deflections and tip twist
“OoPDefl2 , IPDefl2 , TwstDefl2” - Blade 2 out-of-plane and in-plane deflections and tip twist
“OoPDefl3 , IPDefl3 , TwstDefl3” - Blade 3 out-of-plane and in-plane deflections and tip twist
“TwrClrnc1, TwrClrnc2, TwrClrnc3” - Tip-to-tower clearance estimate for blades 1, 2, and 3
“NcIMUTAxs, NcIMUTAys, NcIMUTAzs” - Nacelle IMU translational accelerations (absolute) in the nonrotating, shaft coordinate system
“TTDspFA , TTDspSS , TTDspTwst” - Tower fore-aft and side-to-side displacements and top twist
“PtfmSurge, PtfmSway , PtfmHeave” - Platform translational surge, sway, and heave displacements
“PtfmRoll , PtfmPitch, PtfmYaw” - Platform rotational roll, pitch and yaw displacements
“PtfmTAxt , PtfmTAyt , PtfmTAzt” - Platform translation accelerations (absolute) in the tower-base coordinate system
“RootFxc1 , RootFyc1 , RootFzc1” - Out-of-plane shear, in-plane shear, and axial forces at the root of blade 1
“RootMxc1 , RootMyc1 , RootMzc1” - In-plane bending, out-of-plane bending, and pitching moments at the root of blade 1
“RootFxc2 , RootFyc2 , RootFzc2” - Out-of-plane shear, in-plane shear, and axial forces at the root of blade 2
“RootMxc2 , RootMyc2 , RootMzc2” - In-plane bending, out-of-plane bending, and pitching moments at the root of blade 2
“RootFxc3 , RootFyc3 , RootFzc3” - Out-of-plane shear, in-plane shear, and axial forces at the root of blade 3
“RootMxc3 , RootMyc3 , RootMzc3” - In-plane bending, out-of-plane bending, and pitching moments at the root of blade 3
“Spn1MLxb1, Spn1MLyb1, Spn1MLzb1” - Blade 1 local edgewise bending, flapwise bending, and pitching moments at span station 1 (approx. 50% span)
“Spn1MLxb2, Spn1MLyb2, Spn1MLzb2” - Blade 2 local edgewise bending, flapwise bending, and pitching moments at span station 1 (approx. 50% span)
“Spn1MLxb3, Spn1MLyb3, Spn1MLzb3” - Blade 3 local edgewise bending, flapwise bending, and pitching moments at span station 1 (approx. 50% span)
“RotThrust, LSSGagFya, LSSGagFza” - Rotor thrust and low-speed shaft 0- and 90-rotating shear forces at the main bearing
“RotTorq , LSSGagMya, LSSGagMza” - Rotor torque and low-speed shaft 0- and 90-rotating bending moments at the main bearing
“YawBrFxp , YawBrFyp , YawBrFzp” - Fore-aft shear, side-to-side shear, and vertical forces at the top of the tower (not rotating with nacelle yaw)
“YawBrMxp , YawBrMyp , YawBrMzp” - Side-to-side bending, fore-aft bending, and yaw moments at the top of the tower (not rotating with nacelle yaw)
“TwrBsFxt , TwrBsFyt , TwrBsFzt” - Fore-aft shear, side-to-side shear, and vertical forces at the base of the tower (platform)
“TwrBsMxt , TwrBsMyt , TwrBsMzt” - Side-to-side bending, fore-aft bending, and yaw moments at the base of the tower (platform)
“TwHt1MLxt, TwHt1MLyt, TwHt1MLzt” - Local side-to-side bending, fore-aft bending, and yaw moments at tower gage 1 (approx. 50% elevation)
“Fair1Ten , Fair1Ang , Anch1Ten , Anch1Ang” - Line 1 fairlead and anchor effective tensions and vertical angles
“Fair2Ten , Fair2Ang , Anch2Ten , Anch2Ang” - Line 2 fairlead and anchor effective tensions and vertical angles
“Fair3Ten , Fair3Ang , Anch3Ten , Anch3Ang” - Line 3 fairlead and anchor effective tensions and vertical angles
“Fair4Ten , Fair4Ang , Anch4Ten , Anch4Ang” - Line 3 fairlead and anchor effective tensions and vertical angles
“TipSpdRat, RotCp , RotCt , RotCq” - Rotor tip speed ratio and power, thrust, and torque coefficients
END of FAST input file (the word “END” must appear in the first 3 columns of this last line).

PtfmSurge, PtfmSway ,
“PtfmSurge, PtfmSway , PtfmHeave” - Platform translational surge, sway, and heave displacements
“PtfmRoll , PtfmPitch, PtfmYaw” - Platform rotational roll, pitch and yaw displacements

Hi, based on this, your torque is being set by the user-defined routine: UserVSCont, depending on how FAST was compiled in your case this is either than hard coded, or set to link to an external DLL. If you’re using the built-in controller, it is probably defaulting to just setting the torque to 0. If that is the case, you have options to either:

  1. Modify the user-defined function to implement a desired torque control and recompile FAST
  2. Set up FAST to link to an external DLL (see how to do this in the manual) for its control law
  3. Or perhaps simplest, use VSContrl = 1 and you can get a pretty standard control law in place then by selection of the 4 following parameters.

Hope this helps!

Hi Paul,

Thank you very much for you help, really appreciate it.

Finally, as I’m kind of in a hurry, I decided to go for option three, changing VSControl. If I change it to VSControl=1 another error comes up, so intead I decided to change it to VSControl=0.

I get power values different to 0 but they’re all negative, same happens to the generator torque, do you know what negative values for GenPwr and GenTq mean? What can be wrong?

Thanks again,

Carmen

What is the error when vs = 1? I would recommend this option over 0, I’m not too familiar with option 0, but I think it is simulating a type 1 machine or so, such that the generator has a slip curve centered about its rated speed, I would think =1 is a more suitable choice and I think it should be possible to fix the error quickly

Hello again, this is the error that I get:
'‘VS-Rgn2kxVS_RtGnSp^2 must not be greater than VS-RtTq’

This is my .fst now:


------- FAST INPUT FILE --------------------------------------------------------
NREL 5.0 MW Baseline Wind Turbine for Use in Offshore Analysis.
Properties from Dutch Offshore Wind Energy Converter (DOWEC) 6MW Pre-Design (10046_009.pdf) and REpower 5M 5MW (5m_uk.pdf); Compatible with FAST v7.02.
---------------------- SIMULATION CONTROL --------------------------------------
False Echo - Echo input data to “echo.out” (flag)
1 ADAMSPrep - ADAMS preprocessor mode {1: Run FAST, 2: use FAST as a preprocessor to create an ADAMS model, 3: do both} (switch)
1 AnalMode - Analysis mode {1: Run a time-marching simulation, 2: create a periodic linearized model} (switch)
3 NumBl - Number of blades (-)
3600.0 TMax - Total run time (s)
0.005 DT - Integration time step (s)
---------------------- TURBINE CONTROL -----------------------------------------
0 YCMode - Yaw control mode {0: none, 1: user-defined from routine UserYawCont, 2: user-defined from Simulink/Labview} (switch)
9999.9 TYCOn - Time to enable active yaw control (s) [unused when YCMode=0]
1 PCMode - Pitch control mode {0: none, 1: user-defined from routine PitchCntrl, 2: user-defined from Simulink/Labview} (switch)
0.0 TPCOn - Time to enable active pitch control (s) [unused when PCMode=0]
1 VSContrl - Variable-speed control mode {0: none, 1: simple VS, 2: user-defined from routine UserVSCont, 3: user-defined from Simulink/Labview} (switch)
9999.9 VS_RtGnSp - Rated generator speed for simple variable-speed generator control (HSS side) (rpm) [used only when VSContrl=1]
9999.9 VS_RtTq - Rated generator torque/constant generator torque in Region 3 for simple variable-speed generator control (HSS side) (N-m) [used only when VSContrl=1]
9999.9 VS_Rgn2K - Generator torque constant in Region 2 for simple variable-speed generator control (HSS side) (N-m/rpm^2) [used only when VSContrl=1]
9999.9 VS_SlPc - Rated generator slip percentage in Region 2 1/2 for simple variable-speed generator control (%) [used only when VSContrl=1]
2 GenModel - Generator model {1: simple, 2: Thevenin, 3: user-defined from routine UserGen} (switch) [used only when VSContrl=0]
True GenTiStr - Method to start the generator {T: timed using TimGenOn, F: generator speed using SpdGenOn} (flag)
True GenTiStp - Method to stop the generator {T: timed using TimGenOf, F: when generator power = 0} (flag)
9999.9 SpdGenOn - Generator speed to turn on the generator for a startup (HSS speed) (rpm) [used only when GenTiStr=False]
0.0 TimGenOn - Time to turn on the generator for a startup (s) [used only when GenTiStr=True]
9999.9 TimGenOf - Time to turn off the generator (s) [used only when GenTiStp=True]
1 HSSBrMode - HSS brake model {1: simple, 2: user-defined from routine UserHSSBr, 3: user-defined from Labview} (switch)
9999.9 THSSBrDp - Time to initiate deployment of the HSS brake (s)
9999.9 TiDynBrk - Time to initiate deployment of the dynamic generator brake [CURRENTLY IGNORED] (s)
9999.9 TTpBrDp(1) - Time to initiate deployment of tip brake 1 (s)
9999.9 TTpBrDp(2) - Time to initiate deployment of tip brake 2 (s)
9999.9 TTpBrDp(3) - Time to initiate deployment of tip brake 3 (s) [unused for 2 blades]
9999.9 TBDepISp(1) - Deployment-initiation speed for the tip brake on blade 1 (rpm)
9999.9 TBDepISp(2) - Deployment-initiation speed for the tip brake on blade 2 (rpm)
9999.9 TBDepISp(3) - Deployment-initiation speed for the tip brake on blade 3 (rpm) [unused for 2 blades]
9999.9 TYawManS - Time to start override yaw maneuver and end standard yaw control (s)
9999.9 TYawManE - Time at which override yaw maneuver reaches final yaw angle (s)
0.0 NacYawF - Final yaw angle for yaw maneuvers (degrees)
9999.9 TPitManS(1) - Time to start override pitch maneuver for blade 1 and end standard pitch control (s)
9999.9 TPitManS(2) - Time to start override pitch maneuver for blade 2 and end standard pitch control (s)
9999.9 TPitManS(3) - Time to start override pitch maneuver for blade 3 and end standard pitch control (s) [unused for 2 blades]
9999.9 TPitManE(1) - Time at which override pitch maneuver for blade 1 reaches final pitch (s)
9999.9 TPitManE(2) - Time at which override pitch maneuver for blade 2 reaches final pitch (s)
9999.9 TPitManE(3) - Time at which override pitch maneuver for blade 3 reaches final pitch (s) [unused for 2 blades]
0.0 BlPitch(1) - Blade 1 initial pitch (degrees)
0.0 BlPitch(2) - Blade 2 initial pitch (degrees)
0.0 BlPitch(3) - Blade 3 initial pitch (degrees) [unused for 2 blades]
0.0 BlPitchF(1) - Blade 1 final pitch for pitch maneuvers (degrees)
0.0 BlPitchF(2) - Blade 2 final pitch for pitch maneuvers (degrees)
0.0 BlPitchF(3) - Blade 3 final pitch for pitch maneuvers (degrees) [unused for 2 blades]
---------------------- ENVIRONMENTAL CONDITIONS --------------------------------
9.80665 Gravity - Gravitational acceleration (m/s^2)
---------------------- FEATURE FLAGS -------------------------------------------
False FlapDOF1 - First flapwise blade mode DOF (flag)
False FlapDOF2 - Second flapwise blade mode DOF (flag)
False EdgeDOF - First edgewise blade mode DOF (flag)
False TeetDOF - Rotor-teeter DOF (flag) [unused for 3 blades]
False DrTrDOF - Drivetrain rotational-flexibility DOF (flag)
True GenDOF - Generator DOF (flag)
True YawDOF - Yaw DOF (flag)
False TwFADOF1 - First fore-aft tower bending-mode DOF (flag)
False TwFADOF2 - Second fore-aft tower bending-mode DOF (flag)
False TwSSDOF1 - First side-to-side tower bending-mode DOF (flag)
False TwSSDOF2 - Second side-to-side tower bending-mode DOF (flag)
True CompAero - Compute aerodynamic forces (flag)
False CompNoise - Compute aerodynamic noise (flag)
---------------------- INITIAL CONDITIONS --------------------------------------
0.0 OoPDefl - Initial out-of-plane blade-tip displacement (meters)
0.0 IPDefl - Initial in-plane blade-tip deflection (meters)
0.0 TeetDefl - Initial or fixed teeter angle (degrees) [unused for 3 blades]
0.0 Azimuth - Initial azimuth angle for blade 1 (degrees)
0.0 RotSpeed - Initial or fixed rotor speed (rpm)
0.0 NacYaw - Initial or fixed nacelle-yaw angle (degrees)
0.0 TTDspFA - Initial fore-aft tower-top displacement (meters)
0.0 TTDspSS - Initial side-to-side tower-top displacement (meters)
---------------------- TURBINE CONFIGURATION -----------------------------------
63.0 TipRad - The distance from the rotor apex to the blade tip (meters)
1.5 HubRad - The distance from the rotor apex to the blade root (meters)
1 PSpnElN - Number of the innermost blade element which is still part of the pitchable portion of the blade for partial-span pitch control [1 to BldNodes] [CURRENTLY IGNORED] (-)
0.0 UndSling - Undersling length [distance from teeter pin to the rotor apex] (meters) [unused for 3 blades]
0.0 HubCM - Distance from rotor apex to hub mass [positive downwind] (meters)
-5.01910 OverHang - Distance from yaw axis to rotor apex [3 blades] or teeter pin [2 blades] (meters)
1.9 NacCMxn - Downwind distance from the tower-top to the nacelle CM (meters)
0.0 NacCMyn - Lateral distance from the tower-top to the nacelle CM (meters)
1.75 NacCMzn - Vertical distance from the tower-top to the nacelle CM (meters)
87.6 TowerHt - Height of tower above ground level [onshore] or MSL [offshore] (meters)
1.96256 Twr2Shft - Vertical distance from the tower-top to the rotor shaft (meters)
0.0 TwrRBHt - Tower rigid base height (meters)
-5.0 ShftTilt - Rotor shaft tilt angle (degrees)
0.0 Delta3 - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
-2.5 PreCone(1) - Blade 1 cone angle (degrees)
-2.5 PreCone(2) - Blade 2 cone angle (degrees)
-2.5 PreCone(3) - Blade 3 cone angle (degrees) [unused for 2 blades]
0.0 AzimB1Up - Azimuth value to use for I/O when blade 1 points up (degrees)
---------------------- MASS AND INERTIA ----------------------------------------
0.0 YawBrMass - Yaw bearing mass (kg)
240.00E+3 NacMass - Nacelle mass (kg)
56.78E+3 HubMass - Hub mass (kg)
0.0 TipMass(1) - Tip-brake mass, blade 1 (kg)
0.0 TipMass(2) - Tip-brake mass, blade 2 (kg)
0.0 TipMass(3) - Tip-brake mass, blade 3 (kg) [unused for 2 blades]
2607.89E+3 NacYIner - Nacelle inertia about yaw axis (kg m^2)
534.116 GenIner - Generator inertia about HSS (kg m^2)
115.926E+3 HubIner - Hub inertia about rotor axis [3 blades] or teeter axis [2 blades] (kg m^2)
---------------------- DRIVETRAIN ----------------------------------------------
100.0 GBoxEff - Gearbox efficiency (%)
94.4 GenEff - Generator efficiency [ignored by the Thevenin and user-defined generator models] (%)
1.0 GBRatio - Gearbox ratio (-)
False GBRevers - Gearbox reversal {T: if rotor and generator rotate in opposite directions} (flag)
28.1162E+3 HSSBrTqF - Fully deployed HSS-brake torque (N-m)
0.6 HSSBrDT - Time for HSS-brake to reach full deployment once initiated (sec) [used only when HSSBrMode=1]
“Dummy” DynBrkFi - File containing a mech-gen-torque vs HSS-speed curve for a dynamic brake [CURRENTLY IGNORED] (quoted string)
867.637E+6 DTTorSpr - Drivetrain torsional spring (N-m/rad)
6.215E+6 DTTorDmp - Drivetrain torsional damper (N-m/(rad/s))
---------------------- SIMPLE INDUCTION GENERATOR ------------------------------
9999.9 SIG_SlPc - Rated generator slip percentage (%) [used only when VSContrl=0 and GenModel=1]
9999.9 SIG_SySp - Synchronous (zero-torque) generator speed (rpm) [used only when VSContrl=0 and GenModel=1]
9999.9 SIG_RtTq - Rated torque (N-m) [used only when VSContrl=0 and GenModel=1]
9999.9 SIG_PORt - Pull-out ratio (Tpullout/Trated) (-) [used only when VSContrl=0 and GenModel=1]
---------------------- THEVENIN-EQUIVALENT INDUCTION GENERATOR -----------------
9999.9 TEC_Freq - Line frequency [50 or 60] (Hz) [used only when VSContrl=0 and GenModel=2]
9998 TEC_NPol - Number of poles [even integer > 0] (-) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_SRes - Stator resistance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_RRes - Rotor resistance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_VLL - Line-to-line RMS voltage (volts) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_SLR - Stator leakage reactance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_RLR - Rotor leakage reactance (ohms) [used only when VSContrl=0 and GenModel=2]
9999.9 TEC_MR - Magnetizing reactance (ohms) [used only when VSContrl=0 and GenModel=2]
---------------------- PLATFORM ------------------------------------------------
3 PtfmModel - Platform model {0: none, 1: onshore, 2: fixed bottom offshore, 3: floating offshore} (switch)
“Semisub_Platform.dat” PtfmFile - Name of file containing platform properties (quoted string) [unused when PtfmModel=0]
---------------------- TOWER ---------------------------------------------------
20 TwrNodes - Number of tower nodes used for analysis (-)
“Semisub_Tower.dat” TwrFile - Name of file containing tower properties (quoted string)
---------------------- NACELLE-YAW ---------------------------------------------
9028.32E+6 YawSpr - Nacelle-yaw spring constant (N-m/rad)
19.16E+6 YawDamp - Nacelle-yaw damping constant (N-m/(rad/s))
0.0 YawNeut - Neutral yaw position–yaw spring force is zero at this yaw (degrees)
---------------------- FURLING -------------------------------------------------
False Furling - Read in additional model properties for furling turbine (flag)
“Dummy” FurlFile - Name of file containing furling properties (quoted string) [unused when Furling=False]
---------------------- ROTOR-TEETER --------------------------------------------
0 TeetMod - Rotor-teeter spring/damper model {0: none, 1: standard, 2: user-defined from routine UserTeet} (switch) [unused for 3 blades]
0.0 TeetDmpP - Rotor-teeter damper position (degrees) [used only for 2 blades and when TeetMod=1]
0.0 TeetDmp - Rotor-teeter damping constant (N-m/(rad/s)) [used only for 2 blades and when TeetMod=1]
0.0 TeetCDmp - Rotor-teeter rate-independent Coulomb-damping moment (N-m) [used only for 2 blades and when TeetMod=1]
0.0 TeetSStP - Rotor-teeter soft-stop position (degrees) [used only for 2 blades and when TeetMod=1]
0.0 TeetHStP - Rotor-teeter hard-stop position (degrees) [used only for 2 blades and when TeetMod=1]
0.0 TeetSSSp - Rotor-teeter soft-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
0.0 TeetHSSp - Rotor-teeter hard-stop linear-spring constant (N-m/rad) [used only for 2 blades and when TeetMod=1]
---------------------- TIP-BRAKE -----------------------------------------------
0.0 TBDrConN - Tip-brake drag constant during normal operation, CdArea (m^2)
0.0 TBDrConD - Tip-brake drag constant during fully-deployed operation, Cd
Area (m^2)
0.0 TpBrDT - Time for tip-brake to reach full deployment once released (sec)
---------------------- BLADE ---------------------------------------------------
“Semisub_Blade.dat” BldFile(1) - Name of file containing properties for blade 1 (quoted string)
“Semisub_Blade.dat” BldFile(2) - Name of file containing properties for blade 2 (quoted string)
“Semisub_Blade.dat” BldFile(3) - Name of file containing properties for blade 3 (quoted string) [unused for 2 blades]
---------------------- AERODYN -------------------------------------------------
“Semisub_AeroDyn.ipt” ADFile - Name of file containing AeroDyn input parameters (quoted string)
---------------------- NOISE ---------------------------------------------------
“Dummy” NoiseFile - Name of file containing aerodynamic noise input parameters (quoted string) [used only when CompNoise=True]
---------------------- ADAMS ---------------------------------------------------
“Semisub_ADAMSSpecific.dat” ADAMSFile - Name of file containing ADAMS-specific input parameters (quoted string) [unused when ADAMSPrep=1]
---------------------- LINEARIZATION CONTROL -----------------------------------
“Semisub_Linear.dat” LinFile - Name of file containing FAST linearization parameters (quoted string) [unused when AnalMode=1]
---------------------- OUTPUT --------------------------------------------------
True SumPrint - Print summary data to “.fsm” (flag)
1 OutFileFmt - Format for tabular (time-marching) output file(s) (1: text file [.out], 2: binary file [.outb], 3: both) (switch)
True TabDelim - Use tab delimiters in text tabular output file? (flag)
“ES10.3E2” OutFmt - Format used for text tabular output (except time). Resulting field should be 10 characters. (quoted string) [not checked for validity!]
0.0 TStart - Time to begin tabular output (s)
100 DecFact - Decimation factor for tabular output {1: output every time step} (-)
1.0 SttsTime - Amount of time between screen status messages (sec)
-3.09528 NcIMUxn - Downwind distance from the tower-top to the nacelle IMU (meters)
0.0 NcIMUyn - Lateral distance from the tower-top to the nacelle IMU (meters)
2.23336 NcIMUzn - Vertical distance from the tower-top to the nacelle IMU (meters)
1.912 ShftGagL - Distance from rotor apex [3 blades] or teeter pin [2 blades] to shaft strain gages [positive for upwind rotors] (meters)
1 NTwGages - Number of tower nodes that have strain gages for output [0 to 9] (-)
10 TwrGagNd - List of tower nodes that have strain gages [1 to TwrNodes] (-) [unused if NTwGages=0]
1 NBlGages - Number of blade nodes that have strain gages for output [0 to 9] (-)
9 BldGagNd - List of blade nodes that have strain gages [1 to BldNodes] (-) [unused if NBlGages=0]
OutList - The next line(s) contains a list of output parameters. See OutList.txt for a listing of available output channels, (-)
“WindVxi , WindVyi , WindVzi” - Longitudinal, lateral, and vertical wind speeds
“WaveElev” - Wave elevation at the platform reference point
“GenPwr , GenTq” - Electrical generator power and torque
“RotSpeed , GenSpeed” - Low-speed shaft and high-speed shaft speeds
“TipSpdRat, RotCp , RotCt , RotCq” - Rotor tip speed ratio and power, thrust, and torque coefficients
“PtfmSurge, PtfmSway , PtfmHeave” - Platform translational surge, sway, and heave displacements
“PtfmRoll , PtfmPitch, PtfmYaw” - Platform rotational roll, pitch and yaw displacements
“Fair1Ten , Fair1Ang , Anch1Ten , Anch1Ang” - Line 1 fairlead and anchor effective tensions and vertical angles
“Fair2Ten , Fair2Ang , Anch2Ten , Anch2Ang” - Line 2 fairlead and anchor effective tensions and vertical angles
“Fair3Ten , Fair3Ang , Anch3Ten , Anch3Ang” - Line 3 fairlead and anchor effective tensions and vertical angles
“Fair4Ten , Fair4Ang , Anch4Ten , Anch4Ang” - Line 3 fairlead and anchor effective tensions and vertical angles
“NacYaw , NacYawErr” - Nacelle yaw angle and nacelle yaw error estimate
END of FAST input file (the word “END” must appear in the first 3 columns of this last line).

PtfmSurge, PtfmSway ,
“PtfmSurge, PtfmSway , PtfmHeave” - Platform translational surge, sway, and heave displacements
“PtfmRoll , PtfmPitch, PtfmYaw” - Platform rotational roll, pitch and yaw displacements
“NacYaw , NacYawErr” - Nacelle yaw angle and nacelle yaw error estimate
“OoPDefl1 , IPDefl1 , TwstDefl1” - Blade 1 out-of-plane and in-plane deflections and tip twist
“OoPDefl2 , IPDefl2 , TwstDefl2” - Blade 2 out-of-plane and in-plane deflections and tip twist
“OoPDefl3 , IPDefl3 , TwstDefl3” - Blade 3 out-of-plane and in-plane deflections and tip twist
“TwrClrnc1, TwrClrnc2, TwrClrnc3” - Tip-to-tower clearance estimate for blades 1, 2, and 3
“NcIMUTAxs, NcIMUTAys, NcIMUTAzs” - Nacelle IMU translational accelerations (absolute) in the nonrotating, shaft coordinate system
“TTDspFA , TTDspSS , TTDspTwst” - Tower fore-aft and side-to-side displacements and top twist
“PtfmTAxt , PtfmTAyt , PtfmTAzt” - Platform translation accelerations (absolute) in the tower-base coordinate system
“RootFxc1 , RootFyc1 , RootFzc1” - Out-of-plane shear, in-plane shear, and axial forces at the root of blade 1
“RootMxc1 , RootMyc1 , RootMzc1” - In-plane bending, out-of-plane bending, and pitching moments at the root of blade 1
“RootFxc2 , RootFyc2 , RootFzc2” - Out-of-plane shear, in-plane shear, and axial forces at the root of blade 2
“RootMxc2 , RootMyc2 , RootMzc2” - In-plane bending, out-of-plane bending, and pitching moments at the root of blade 2
“RootFxc3 , RootFyc3 , RootFzc3” - Out-of-plane shear, in-plane shear, and axial forces at the root of blade 3
“RootMxc3 , RootMyc3 , RootMzc3” - In-plane bending, out-of-plane bending, and pitching moments at the root of blade 3
“Spn1MLxb1, Spn1MLyb1, Spn1MLzb1” - Blade 1 local edgewise bending, flapwise bending, and pitching moments at span station 1 (approx. 50% span)
“Spn1MLxb2, Spn1MLyb2, Spn1MLzb2” - Blade 2 local edgewise bending, flapwise bending, and pitching moments at span station 1 (approx. 50% span)
“Spn1MLxb3, Spn1MLyb3, Spn1MLzb3” - Blade 3 local edgewise bending, flapwise bending, and pitching moments at span station 1 (approx. 50% span)
“RotThrust, LSSGagFya, LSSGagFza” - Rotor thrust and low-speed shaft 0- and 90-rotating shear forces at the main bearing
“RotTorq , LSSGagMya, LSSGagMza” - Rotor torque and low-speed shaft 0- and 90-rotating bending moments at the main bearing
“YawBrFxp , YawBrFyp , YawBrFzp” - Fore-aft shear, side-to-side shear, and vertical forces at the top of the tower (not rotating with nacelle yaw)
“YawBrMxp , YawBrMyp , YawBrMzp” - Side-to-side bending, fore-aft bending, and yaw moments at the top of the tower (not rotating with nacelle yaw)
“TwrBsFxt , TwrBsFyt , TwrBsFzt” - Fore-aft shear, side-to-side shear, and vertical forces at the base of the tower (platform)
“TwrBsMxt , TwrBsMyt , TwrBsMzt” - Side-to-side bending, fore-aft bending, and yaw moments at the base of the tower (platform)
“TwHt1MLxt, TwHt1MLyt, TwHt1MLzt” - Local side-to-side bending, fore-aft bending, and yaw moments at tower gage 1 (approx. 50% elevation)
“WaveElev” - Wave elevation at the platform reference point
“Wave1Vxi , Wave1Vyi , Wave1Vzi” - Longitudinal, lateral, and vertical wave particle velocities at platform node 1 (approx. platform reference point)
“Wave1Axi , Wave1Ayi , Wave1Azi” - Longitudinal, lateral, and vertical wave particle accelerations at platform node 1 (approx. platform reference point)
“HSSBrTq” - High-speed shaft brake torque
“BldPitch1, BldPitch2, BldPitch3” - Pitch angles for blades 1, 2, and 3
“Azimuth” - Blade 1 azimuth angle
“PtfmSurge, PtfmSway , PtfmHeave” - Platform translational surge, sway, and heave displacements
“PtfmRoll , PtfmPitch, PtfmYaw” - Platform rotational roll, pitch and yaw displacements
“Fair1Ten , Fair1Ang , Anch1Ten , Anch1Ang” - Line 1 fairlead and anchor effective tensions and vertical angles
“Fair2Ten , Fair2Ang , Anch2Ten , Anch2Ang” - Line 2 fairlead and anchor effective tensions and vertical angles
“Fair3Ten , Fair3Ang , Anch3Ten , Anch3Ang” - Line 3 fairlead and anchor effective tensions and vertical angles
“Fair4Ten , Fair4Ang , Anch4Ten , Anch4Ang”

You need to set these parameters:

9999.9 VS_RtGnSp - Rated generator speed for simple variable-speed generator control (HSS side) (rpm) [used only when VSContrl=1]
9999.9 VS_RtTq - Rated generator torque/constant generator torque in Region 3 for simple variable-speed generator control (HSS side) (N-m) [used only when VSContrl=1]
9999.9 VS_Rgn2K - Generator torque constant in Region 2 for simple variable-speed generator control (HSS side) (N-m/rpm^2) [used only when VSContrl=1]
9999.9 VS_SlPc - Rated generator slip percentage in Region 2 1/2 for simple variable-speed generator control (%) [used only when VSContrl=1]

Based on your selected turbine, check the FAST manual (page 26) for more details on these values and how to choose them

Paul

Hi Paul,

I will check that and will tryto figure it out

Thanks for your help :slight_smile:

Dear Carmen,

It looks like you are using a slightly modified version of the NREL 5-MW turbine in FAST v7.02. All of the NREL 5-MW turbine models that NREL has developed make use of a torque and pitch controller in GH Bladed-style DLL format (called DISCON.dll). These controllers require FAST’s interface to GH Bladed-style DLLs, which is not a default option in FAST v7.02. You can find a version of FAST v7.02 with this interface here: wind.nrel.gov/public/jjonkman/FA … erface.exe (or you can recompile yourself).

Best regards,