Dear Zhe.Zhang,
I’m not seeing a very good match between the linear and nonlinear results in your plots. But it is difficult for me guess why the results not agreeing. I would suggest simplifying the model down to one DOF to see if you can get a better agreement. Once you get good agreement with one DOF, add addition DOFs/complexities in steps.
Best regards,
Dear Dr. Jonkman,
As you said, I only enabled one degree of freedom, but the differences are still large. Are these differences due to different versions? I only use fast7 for linear calculations, but I use fast8 for non-linear models. If it is not a version problem, why is there such a difference? I noticed that the pitch angle of the linear model changes slowly at the time of wind speed change. Is this related to the pitch rate setting in fast7? This value can be set in PitManRat in fast8, but how can I change this in Fast v7? Please help me find out why the model results are different.
Thanks
Best regards,
Zhe.Zhang
fast7.zip (12.8 KB)
fast8.zip (82.6 KB)
Dear Zhe.Zhang,
I would not expect large differences only because you switched from FAST v7 to FAST v8, assuming you’ve set equivalent inputs between the two versions (I did not check all these, and you didn’t send me your AeroDyn inputs to check anyway).
Looking at your results, it looks like the blade-pitch response is very different between the two solutions. Are you using the same controller in both the linear and nonlinear solutions? Are using the units that are consistent with the linear and nonlinear models in both pitch controller? You could see if the problem is in the pitch controller by disabling the pitch controller altogether and seeing if you get a similar change in rotor speed with the step wind you are applying.
Best regards,
Dear Jason
I noticed that the pitch angle of the linear model changes slowly at the time of wind speed change. Is this related to the pitch rate setting in fast7? This value can be set in PitManRat in fast8, but how can I change this in Fast v7?
Dear Zhe.Zhang,
No. ServoDyn input PitManRat in FAST v8 is only used in the override pitch maneuvers, which you have not enabled. The override pitch maneuver also exists in FAST v7, but the input is slightly different. In FAST v8, the override pitch maneuver is defined by inputs TPitManS, PitManRat, and BlPitchF whereas in FAST v7 the override pitch maneuver is defined by inputs TPitManS, TPitManE, and BlPitchF (i.e., TPitManE is used in place of PitManRat). But regardless, you have not enabled the override pitch maneuver, so, this will not effect your result.
Best regards,
Dear Jason
Thank you very much for your patience for answering, it is really because of the unit of the controller.
sincerely yours，
Zhe.Zhang
Dear Jason，
I modified the parameters of my controller and got the following comparison results. What I don’t understand is why the non-linear model fluctuates sharply at the initial moment. Is this a normal phenomenon? What do you think of this comparison result？
sincerely yours，
Zhe.Zhang
result.zip (100 KB)
Dear Zhe.Zhang,
My guess is your controller is highly sensitive to the initial conditions that are set. I would suggest either running a longer simulation and ignoring the results during the start-up transient or setting better initial conditions. Normally I would recommend setting the rotor speed and blade-pitch angle to their expected mean values for the given condition (mean wind speed), but you could always set other initial conditions (e.g., blade, tower, and platform deflections) to their expected mean values as well.
Best regards,
Hi,
This is my first post and this is a honour to be a part of this forum.
I am working on the linearizing of wind turbine at different Maximum Power Points (MPPs) for different wind speed values. To do this, I have obtained the rotor speed at MPP for different MPPs according to the Power_Rotor Speed curve, Fig.1. Rotor speed for wind speed = 9m/s at MPP is 160.38 rpm (10kW wind turbine is selected). I have used FASTv7 for Linearization.
I have set the rotor speed to 160.38 (rotor speed at MPP) and the linearization is done with only 1 DOF and the generator torque is selected as the control input. The linearizatoin output is shown in Fig2
Thanks in advance.
Babak[/b][/b]
Hi Babak,
I’m not really sure what you want commented on. And I’m not following everything in your post because of some inconsistencies, i.e., your power-speed curve shows the MPP at a rotor speed of 16 rpm, the text in your post refers to 160 rpm, and the linearization output file refers to 7.5288 rad/s = 71.89 rpm. Can you clarify your question?
Best regards,
Dear Jason,
Thanks for your reply and sorry for the inconsistencies.
I want to obtain multiple linear models of a wind turbine at different MPPs for different wind speeds and then design controllers for each of these models.
Here, I have attached the Power-Rotor Speed curve for wind speed = 9m/s, Fig.1. The rotation speed at MPP is 160.38 rpm.
Then, I have linearized the turbine around this point, by setting RotSpeed to 160.38 (rotor speed at the MPP). I have attached the linearzation output, Fig2. Linearization is done with 1 DOF and the control input is generator torque.
Best regards,
Babak
Dear Babak,
OK, thanks for fixing the inconsistencies. The rotor speed in the linearization file, text, and plot now all match!
I don’t really see anything problematic with what you are doing, but I did notice that the power at the linearization operating point does not match your plot, i.e., ( rotor speed )*( generator torque ) = ( 16.7948 rad/s ) ( 221.9 Nm ) = 3.73 kW, not 2.2 kW, from your plot. That said I’m not sure what your gearbox ratio or generator efficiency is (I assumed both are 1.0 here).
Best regards,
Dear Jason,
Thanks for your reply.
I checked the primary input file and I changed the generator efficiency from 83% to 100% but the torque at the linearization operating point did not change. Please advice with this matter. what could be the problem that power values do not match? My linearized model is wrong or …?
Best regards,
Babak
Dear Babak,
The generator torque and speed are not directly influenced by the generator efficiency.
mechanical power = torquespeed
electrical power = torquespeed*efficiency
Unless the electrical power is fed back and used in the controller, it has no impact on the FAST solution.
Was your power versus speed curve derived from FAST and is the power mechanical or electrical?
Best regards,
Dear Jason,
The power curve has been derived from FASTv8. I have used electrical power. How much difference is reasonable between the obtained power from curve and the power from linearization output? Can it be because of using different versions of FAST?
Regards,
Babak
Dear Babak,
For equivalent settings, I would expect quite similar results between FAST v7 and FAST v8. In your case, the power is quite a bit off, so, I would expect that you have some settings set inconsistently.
Is there a reason you are using both FAST v7 and FAST v8? I would suggest upgrading and using the same version for the full analysis (to minimize the possibility of using different settings between analyses). Better yet, upgrade to OpenFAST.
Best regards,
Dear Jason,
Thanks for your helps.
The reason is that I do not know how to linearize around specific rotor speed in FAST8 and in FAST8 it is not possible to specify the control input.
One more question is:
I only need to use GetMats to obtain the averaged model (Linearized plant). In my case, only GenDOF is activated and the control input is generator torque So MBC is not needed because I do not have state(s) in rotating frame, right?
I appreciate for your helps and information.
Kind regards,
Babak
Dear Babak,
Good point. The control trim functionality from FAST v7 was not available in FAST v8, making the operating-point determination process a bit more difficult (but not impossible). NREL has worked with Envision Energy to reintroduce trim functionality into OpenFAST. I’m not sure why this capability has not yet been merged into OpenFAST-dev, but it is available in an OpenFAST pull request (waiting to be reviewed before being merged)–see: github.com/OpenFAST/openfast/pull/373.
Yes, I agree, no need to apply MBC in your case because your linearized model does not have states, inputs, or outputs, in the rotating frame.
Best regards,
Dear Jason,
With regards to our previous discussion, I want to obtain (Power-Rotor Speed) curves (in region 2) for different constant wind speeds in FAST7 and then compare it with the linearized model in FAST7.
10kW wind turbine is selected (Test17.fst). Only GenDOF is activated and the ‘‘RotSpeed’’ and ‘’‘RotPwr’’ are used in the output to get rotor speed and power, respectively. The pitch angle value is set to 7.5° (optimal value in region2). The primary input file is as below:
[code]--------------------------------------------------------------------------------
------- FAST INPUT FILE --------------------------------------------------------
FAST certification Test #17: FAST model of a SWRT 3-bladed upwind turbine. Note- SWRT rotates in CCW direction- some inputs will be mirror image of the actual turbine.
Model properties from “SWRTv1p2.adm” and SWRT “AdamsWT_MakeBladeDat_v12.xls”. JEM Jan., 2004. Updated by J. Jonkman, NREL, Feb, 2004. Compatible with FAST v7.02.00.
---------------------- SIMULATION CONTROL --------------------------------------
False Echo - Echo input data to “echo.out” (flag)
3 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 (-)
70.0 TMax - Total run time (s)
0.001 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]
0 PCMode - Pitch control mode {0: none, 1: user-defined from routine PitchCntrl, 2: user-defined from Simulink/Labview} (switch)
9999.9 TPCOn - Time to enable active pitch control (s) [unused when PCMode=0]
0 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]
1 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]
7.5 BlPitch(1) - Blade 1 initial pitch (degrees)
7.5 BlPitch(2) - Blade 2 initial pitch (degrees)
7.5 BlPitch(3) - Blade 3 initial pitch (degrees) [unused for 2 blades]
7.5 BlPitchF(1) - Blade 1 final pitch for pitch maneuvers (degrees)
7.5 BlPitchF(2) - Blade 2 final pitch for pitch maneuvers (degrees)
7.5 BlPitchF(3) - Blade 3 final pitch for pitch maneuvers (degrees) [unused for 2 blades]
---------------------- ENVIRONMENTAL CONDITIONS --------------------------------
9.81 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)
False 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 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 -----------------------------------
2.90 TipRad - The distance from the rotor apex to the blade tip (meters)
0.303 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]
0.1536 HubCM - Distance from rotor apex to hub mass [positive downwind] (meters)
-0.7456 OverHang - Distance from yaw axis to rotor apex [3 blades] or teeter pin [2 blades] (meters)
-0.2307 NacCMxn - Downwind distance from the tower-top to the nacelle CM (meters)
0.0910 NacCMyn - Lateral distance from the tower-top to the nacelle CM (meters)
0.5475 NacCMzn - Vertical distance from the tower-top to the nacelle CM (meters)
34.0 TowerHt - Height of tower above ground level [onshore] or MSL [offshore] (meters)
0.515112 Twr2Shft - Vertical distance from the tower-top to the rotor shaft (meters)
0.0 TwrRBHt - Tower rigid base height (meters)
-8.0 ShftTilt - Rotor shaft tilt angle (degrees). Negative for an upwind rotor.
0.0 Delta3 - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
0.0 PreCone(1) - Blade 1 cone angle (degrees)
0.0 PreCone(2) - Blade 2 cone angle (degrees)
0.0 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)
260.5 NacMass - Nacelle mass (kg)
113.0 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]
39.81 NacYIner - Nacelle inertia about yaw axis (kg m^2)
0.5 GenIner - Generator inertia about HSS (kg m^2)
7.71 HubIner - Hub inertia about rotor axis [3 blades] or teeter axis [2 blades] (kg m^2)
---------------------- DRIVETRAIN ----------------------------------------------
100.0 GBoxEff - Gearbox efficiency (%)
100.0 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)
9999.9 HSSBrTqF - Fully deployed HSS-brake torque (N-m)
9999.9 HSSBrDT - Time for HSS-brake to reach full deployment once initiated (sec) [used only when HSSBrMode=1]
“unused” DynBrkFi - File containing a mech-gen-torque vs HSS-speed curve for a dynamic brake [CURRENTLY IGNORED] (quoted string)
9999.9 DTTorSpr - Drivetrain torsional spring (N-m/rad)
9999.9 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 ------------------------------------------------
0 PtfmModel - Platform model {0: none, 1: onshore, 2: fixed bottom offshore, 3: floating offshore} (switch)
“unused” PtfmFile - Name of file containing platform properties (quoted string) [unused when PtfmModel=0]
---------------------- TOWER ---------------------------------------------------
10 TwrNodes - Number of tower nodes used for analysis (-)
“SWRT_Tower.dat” TwrFile - Name of file containing tower properties (quoted string)
---------------------- NACELLE-YAW ---------------------------------------------
0.0 YawSpr - Nacelle-yaw spring constant (N-m/rad)
0.0 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 -------------------------------------------------
True Furling - Read in additional model properties for furling turbine (flag)
“SWRT_Furl.dat” 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, CdArea (m^2)
0.0 TpBrDT - Time for tip-brake to reach full deployment once released (sec)
---------------------- BLADE ---------------------------------------------------
“SWRT_Blade.dat” BldFile(1) - Name of file containing properties for blade 1 (quoted string)
“SWRT_Blade.dat” BldFile(2) - Name of file containing properties for blade 2 (quoted string)
“SWRT_Blade.dat” BldFile(3) - Name of file containing properties for blade 3 (quoted string) [unused for 2 blades]
---------------------- AERODYN -------------------------------------------------
“Test17_AD.ipt” ADFile - Name of file containing AeroDyn input parameters (quoted string)
---------------------- NOISE ---------------------------------------------------
“unused” NoiseFile - Name of file containing aerodynamic noise input parameters (quoted string) [used only when CompNoise=True]
---------------------- ADAMS ---------------------------------------------------
“SWRT_ADAMS.dat” ADAMSFile - Name of file containing ADAMS-specific input parameters (quoted string) [unused when ADAMSPrep=1]
---------------------- LINEARIZATION CONTROL -----------------------------------
“SWRT_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!]
10.0 TStart - Time to begin tabular output (s)
8 DecFact - Decimation factor for tabular output {1: output every time step} (-)
1.0 SttsTime - Amount of time between screen status messages (sec)
0.0 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)
0.0 NcIMUzn - Vertical distance from the tower-top to the nacelle IMU (meters)
0.1 ShftGagL - Distance from rotor apex [3 blades] or teeter pin [2 blades] to shaft strain gages [positive for upwind rotors] (meters)
0 NTwGages - Number of tower nodes that have strain gages for output [0 to 9] (-)
0 TwrGagNd - List of tower nodes that have strain gages [1 to TwrNodes] (-) [unused if NTwGages=0]
0 NBlGages - Number of blade nodes that have strain gages for output [0 to 9] (-)
0 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.xlsx for a listing of available output channels, (-)
“RotSpeed”
“RotPwr”
[/code]
However, the speed and power curves do not seem to be correct, Fig2. Speed increases and settles in a constant value and the power is a negligible negative value.
I would be appreciated to let me know what could be the problem.
Kind regards,
Babak
Dear Babak,
If you enable GenDOF, you must enable a generator model or torque controller to regulate the rotor / generator speed. In your case, you’ve set VSContrl = 0 and GenModel = 1, which selects the simple induction generator (SIG) model. But all of your SIG inputs (SIG_SlPc, SIG_SySp, SIG_RtTq, and SIG_PORt) are set to meaningless values (9999.9), which is resulting in the unexpected behavior.
Best regards,
