Pitch and Torque Cntrl (Region 3)

This forum if for discussing controls. Questions about how to implement controls in FAST are more appropriate to the CAE Tools forum.

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Sina.Ameli
Posts: 31
Joined: Mon Oct 15, 2018 11:23 am
Organization: ULL
Location: Louisiana

Pitch and Torque Cntrl (Region 3)

Postby Sina.Ameli » Wed Oct 24, 2018 9:41 am

Dear Dr. Jonkman,

One document in Fast 7 (A wind turbine with 600KW) explains that to have the maximum generator torque in region 3, we should have a fixed generator torque like this:
600Kw.PNG
600Kw.PNG (28.6 KiB) Viewed 1963 times


While, in another document related to 5MW for offshore wind turbines, the maximum generator torque in region 3 is decreasing. The below picture shows this:
5MW_Offshore.PNG
5MW_Offshore.PNG (52.04 KiB) Viewed 1963 times


May I know what is the underlying reason behind this difference?

Thanks

Best Regards,
Sina

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Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Wed Oct 24, 2018 12:24 pm

Dear Sina,

There are two torque strategies in Region 3 (above rated): constant torque or constant power. In the former, the generator torque is held constant regardless of speed variations, which means the generator power (equaling torque times speed times efficiency loss) is variable. In the latter, the generator torque is inversely proportional to the speed variations, which means the generator power is constant. In the latter, the pitch controller must work a bit harder to regulate generator speed (to counteract the generator torque variations).

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Sina.Ameli
Posts: 31
Joined: Mon Oct 15, 2018 11:23 am
Organization: ULL
Location: Louisiana

Re: Pitch and Torque Cntrl (Region 3)

Postby Sina.Ameli » Wed Oct 31, 2018 12:22 pm

Dear Dr. Jonkman,

Thanks for clarifying the issue. If the pitch controller must work harder, may I know why the latter method (constant power) is used? In other words, what are the pros and cons of each approach?

Thanks

Best Regards,
Sina

Jason.Jonkman
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Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Wed Oct 31, 2018 4:02 pm

Dear Sina,

With the constant power strategy, the generator torque varies and the pitch-control system must work a bit harder, but the generator power is constant. With the constant torque strategy, the pitch-control system does not have to work as hard, but the generator power is variable, which means the generator is overloaded for periods of time. Either way, the control strategy must be considered in the detailed design of the turbine components.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Sina.Ameli
Posts: 31
Joined: Mon Oct 15, 2018 11:23 am
Organization: ULL
Location: Louisiana

Re: Pitch and Torque Cntrl (Region 3)

Postby Sina.Ameli » Mon Nov 05, 2018 5:26 pm

Dear Dr. Jonkman,
Thanks again for clarifying the issue. I got these results:
GenPwr-GenSpeed.PNG
GenPwr-GenSpeed.PNG (34.75 KiB) Viewed 1782 times

My question is that, are those figures are correct? If they are not, what is the reason? because my figures in region 3 are different from the above figures I placed!

Thanks

Best Regards,
Sina
Attachments
GenTrq-GenSpeed.PNG
GenTrq-GenSpeed.PNG (35.85 KiB) Viewed 1782 times

Jason.Jonkman
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Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Mon Nov 05, 2018 10:40 pm

Dear Sina,

No, these do not look correct e.g. I don't see any 1.5 or 2.5 regions in your torque-speed curve. How were these curves made?

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Muddassir.Nawaz
Posts: 19
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Organization: Hochschule Bremerhaven
Location: Germany

Re: Pitch and Torque Cntrl (Region 3)

Postby Muddassir.Nawaz » Mon Nov 19, 2018 3:37 am

Hello jason,

I am working on Krogmann 15/50 Wind turbine. With Power of 50kW and Generator speed of 1500 rpm. So i have calculated Generator Torque of 318.31 N-m. I am trying to build Torque controller. i am confused about the omega1 and omega2 values for my system and how do i achieve Variable-speed regions. As attached in picture do i have to suppose my omega1 and omega2 values. Will my rated Torque be 318.31?

Thank you
best regards
Muddassir Nawaz
Attachments
Graph.jpg
Graph.jpg (30.6 KiB) Viewed 1461 times

Jason.Jonkman
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Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Mon Nov 19, 2018 10:15 am

Dear Muddassir,

I would guess your rated generator torque would be more than 318.31 Nm because normally the electrical power output is less than the mechanical power output due to electrical efficiency losses.

I'm not sure what you mean by omega1 and omega2; are you referring to the transition generator speeds between regions 1 and 2 and between regions 2 and 3?

The constant (K) in the standard variable-speed torque control law (T=K*omega^2) can be calculated from the power coefficient surface...you'll need to know the peak power coefficient and the tip-speed ratio where this peak occurs.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Muddassir.Nawaz
Posts: 19
Joined: Mon Jan 15, 2018 1:57 am
Organization: Hochschule Bremerhaven
Location: Germany

Re: Pitch and Torque Cntrl (Region 3)

Postby Muddassir.Nawaz » Tue Nov 20, 2018 4:08 pm

Dear jason,

Thank you for your response. Generator Torque calculated in my case as (GenTq = Rotor Torque/Gearbox ratio), here Rotor Torque = 7.3477kNm and Gearbox ratio = 23.23. So my GenTq = 316.5Nm. And Maximum Generator Power obtains at toruqe 318.31Nm. So i assume Rated Torque to be 318.31Nm.

The Omega1 and Omega2 are where region 21/2 starts and end. In "Advanced Control Design for Wind Turbines" Omega1 is 1691.98rpm and Omega2 is 1781.98rpm. These values are frictional or calculated? As i wanted to find out region 21/2 for Krogmann 15/50 wind turbine.

Thank you
best regards
Muddassir Nawaz

Jason.Jonkman
Posts: 3964
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
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Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Tue Nov 20, 2018 6:26 pm

Dear Muddassir,

I believe the values of omega1 and omega2 you are reporting are appropriate for the CART2 wind turbine.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Muddassir.Nawaz
Posts: 19
Joined: Mon Jan 15, 2018 1:57 am
Organization: Hochschule Bremerhaven
Location: Germany

Re: Pitch and Torque Cntrl (Region 3)

Postby Muddassir.Nawaz » Sun Nov 25, 2018 8:38 am

Hello jason,

Thank you for your response. Sorry you misunderstood, I am not reporting Omega1 and Omega2 values, just describing that Omega1 and Omega2 are where region 21/2 start and end. In my first Post on this page you asked what Omga1 and Omega2 are?

My Question still remains, Omega1 and Omega2 values are calculated or supposed?

I supposed values for , Omega1 = 1436.498rpm , Omega2 = 1461.963rpm. After running Simulation as shown in picture, i got rated Torque at 2700 rpm. This is incorrect. At GenSpeed 1500 rpm, i should have a constant Rated Torque.

Code: Select all

--------------------------------------------------------------------------------
------- FAST INPUT FILE --------------------------------------------------------
FAST certification Test #08: AOC 15/50 with many DOFs with fixed yaw error and steady wind.
Many parameters are pure fiction.  Compatible with FAST v7.02.00.
---------------------- 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 (-)
  35.0      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]
   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]
   1        VSContrl    - Variable-speed control mode {0: none, 1: simple VS, 2: user-defined from routine UserVSCont, 3: user-defined from Simulink/Labview} (switch)
1461.963     VS_RtGnSp   - Rated generator speed for simple variable-speed generator control (HSS side) (rpm) [used only when VSContrl=1]
318.31      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]
0.0001379   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]
17.18       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]
   6.0      TimGenOn    - Time to turn on the generator for a startup (s) [used only when GenTiStr=True]
25.0          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]
   1.54    BlPitch(1)  - Blade 1 initial pitch (degrees)
   1.54     BlPitch(2)  - Blade 2 initial pitch (degrees)
   1.54    BlPitch(3)  - Blade 3 initial pitch (degrees) [unused for 2 blades]
   1.54    BlPitchF(1) - Blade 1 final pitch for pitch maneuvers (degrees)
   1.54    BlPitchF(2) - Blade 2 final pitch for pitch maneuvers (degrees)
   1.54    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]
True       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)
   64.5    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 -----------------------------------
   7.490    TipRad      - The distance from the rotor apex to the blade tip (meters)
   0.230    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)
   1.341    OverHang    - Distance from yaw axis to rotor apex [3 blades] or teeter pin [2 blades] (meters)
   0.0      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)
   0.6      NacCMzn     - Vertical distance from the tower-top to the nacelle CM (meters)
   30      TowerHt     - Height of tower above ground level [onshore] or MSL [offshore] (meters)
   0.61      Twr2Shft    - Vertical distance from the tower-top to the rotor shaft (meters)
   0.0      TwrRBHt     - Tower rigid base height (meters)
   0.0      ShftTilt    - Rotor shaft tilt angle (degrees)
   0.0      Delta3      - Delta-3 angle for teetering rotors (degrees) [unused for 3 blades]
   6.0      PreCone(1)  - Blade 1 cone angle (degrees)
   6.0      PreCone(2)  - Blade 2 cone angle (degrees)
   6.0      PreCone(3)  - Blade 3 cone angle (degrees) [unused for 2 blades]
   0.17      AzimB1Up    - Azimuth value to use for I/O when blade 1 points up (degrees)
---------------------- MASS AND INERTIA ----------------------------------------
   0.0      YawBrMass   - Yaw bearing mass (kg)
2440.25      NacMass     - Nacelle mass (kg)
 294.4      HubMass     - Hub mass (kg)
   5.9      TipMass(1)  - Tip-brake mass, blade 1 (kg)
   5.9      TipMass(2)  - Tip-brake mass, blade 2 (kg)
   5.9      TipMass(3)  - Tip-brake mass, blade 3 (kg) [unused for 2 blades]
 417.106      NacYIner    - Nacelle inertia about yaw axis (kg m^2)
  10.0      GenIner     - Generator inertia about HSS (kg m^2)
   64.0      HubIner     - Hub inertia about rotor axis [3 blades] or teeter axis [2 blades] (kg m^2)
---------------------- DRIVETRAIN ----------------------------------------------
 98.0      GBoxEff     - Gearbox efficiency (%)
  92.8      GenEff      - Generator efficiency [ignored by the Thevenin and user-defined generator models] (%)
  23.23     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)
   1.76E5    DTTorSpr    - Drivetrain torsional spring (N-m/rad)
   1.0E5    DTTorDmp    - Drivetrain torsional damper (N-m/(rad/s))
---------------------- SIMPLE INDUCTION GENERATOR ------------------------------  Crude approximation of torque/speed curve.
   2.222    SIG_SlPc    - Rated generator slip percentage (%) [used only when VSContrl=0 and GenModel=1]
1500.0      SIG_SySp    - Synchronous (zero-torque) generator speed (rpm) [used only when VSContrl=0 and GenModel=1]
 318.31      SIG_RtTq    - Rated torque (N-m) [used only when VSContrl=0 and GenModel=1]
   1.75     SIG_PORt    - Pull-out ratio (Tpullout/Trated) (-) [used only when VSContrl=0 and GenModel=1]
---------------------- THEVENIN-EQUIVALENT INDUCTION GENERATOR -----------------
  60.0      TEC_Freq    - Line frequency [50 or 60] (Hz) [used only when VSContrl=0 and GenModel=2]
   4        TEC_NPol    - Number of poles [even integer > 0] (-) [used only when VSContrl=0 and GenModel=2]
   4.92E-02 TEC_SRes    - Stator resistance (ohms) [used only when VSContrl=0 and GenModel=2]
   5.34E-04 TEC_RRes    - Rotor resistance (ohms) [used only when VSContrl=0 and GenModel=2]
 480.0      TEC_VLL     - Line-to-line RMS voltage (volts) [used only when VSContrl=0 and GenModel=2]
   1.00E-04 TEC_SLR     - Stator leakage reactance (ohms) [used only when VSContrl=0 and GenModel=2]
   1.00E-04 TEC_RLR     - Rotor leakage reactance (ohms) [used only when VSContrl=0 and GenModel=2]
   4.49E-03 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 ---------------------------------------------------
  11        TwrNodes    - Number of tower nodes used for analysis (-)
"AOC_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 -------------------------------------------------
False       Furling     - Read in additional model properties for furling turbine (flag)
"unused"    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, Cd*Area (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 ---------------------------------------------------
"AOC_Blade.dat"         BldFile(1) - Name of file containing properties for blade 1 (quoted string)
"AOC_Blade.dat"         BldFile(2) - Name of file containing properties for blade 2 (quoted string)
"AOC_Blade.dat"         BldFile(3) - Name of file containing properties for blade 3 (quoted string) [unused for 2 blades]
---------------------- AERODYN -------------------------------------------------
"aerodyn1.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 ---------------------------------------------------
"AOC_ADAMS.dat"         ADAMSFile  - Name of file containing ADAMS-specific input parameters (quoted string) [unused when ADAMSPrep=1]
---------------------- LINEARIZATION CONTROL -----------------------------------
"AOC_Linear.dat"        LinFile    - Name of file containing FAST linearization parameters (quoted string) [unused when AnalMode=1]
---------------------- OUTPUT --------------------------------------------------
True        SumPrint    - Print summary data to "<RootName>.fsm" (flag)
1           OutFileFmt  - Format for tabular (time-marching) output file(s) (1: text file [<RootName>.out], 2: binary file [<RootName>.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!]
  5.0      TStart      - Time to begin tabular output (s)
  10        DecFact     - Decimation factor for tabular output {1: output every time step} (-)
   5.0      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)
   0.5      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]
   5        NBlGages    - Number of blade nodes that have strain gages for output [0 to 9] (-)
  2,4,6,8,9       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.xlsx for a listing of available output channels, (-)
"TotWindV"                     - Wind speed         
"TipDxb3,TipDyb3"                  - Blade 3 flapwise and edgewise tip deflections
"TipRDxb3,TipRDyb3"                - Blade 3 roll and pitch tip deflections
"Spn5ALxb1,Spn5ALyb1"              - Blade 1 Gage #5 (Node 9) local flapwise and edgewise accelerations
"RotSpeed,LSSGagV,HSShftV"         - Rotor, LSS (GBox side), and HSS speed
"RootFxb3,RootFyb3"                - Blade 3 root flapwise and edgewise shear forces
"RootMEdg3,RootMFlp3"              - Blade 3 root edgewise and flapwise bending moments
"Spn4MLxb1,Spn4MLyb1"              - Blade 1 Gage #4 (Node 8) local edgewise and flapwise bending moments
"LSSGagFxs,LSSGagFys,LSSGagFzs"    - Non-rotating LSS thrust and shear forces
"LSShftTq,HSShftTq,GenTq"          - LSS, HSS, and generator torque
"LSShftPwr,HSShftPwr,GenPwr"       - LSS, HSS, and generator power
END of FAST input file (the word "END" must appear in the first 3 columns of this last line).
--------------------------------------------------------------------------------




Can you please let me know what is going wrong in my case.

I would appreciate any help.
Thank you
Best regards
Muddassir Nawaz
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Jason.Jonkman
Posts: 3964
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Mon Nov 26, 2018 7:16 am

Dear Muddassir,

I don't know how to answer your question because I don't know anything about the Krogmann 15/50 wind turbine. In general, you should set the values to match the properties of the actual wind turbine you are modeling.

Does this wind turbine have a variable speed torque controller? Does it operate with a region 2.5? How did you make your generator torque versus generator speed plot?

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Muddassir.Nawaz
Posts: 19
Joined: Mon Jan 15, 2018 1:57 am
Organization: Hochschule Bremerhaven
Location: Germany

Re: Pitch and Torque Cntrl (Region 3)

Postby Muddassir.Nawaz » Wed Jan 02, 2019 4:12 pm

Hello Jason,

I checked Krogmann 15/50 deosn't have region 2.5 (it has four regions 1, 2, 3 ,4). but it has a torque controller. Can you tell me how to apply Wind as Input signal in FAST7 to check Wind turbine Performance(as i have my own wind calculation .wnd file). I tried with Test01_SIG.mdl {Since i don't have any idea how controller will look like without 2.5 region, as all document to controller on internet are related region 2.5. if you could link me to controller document, that will be helpful}. But How to apply wind as input? do i use "TotWindV" in simulink?

Thanks
best regards
Muddassir Nawaz

Jason.Jonkman
Posts: 3964
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Pitch and Torque Cntrl (Region 3)

Postby Jason.Jonkman » Wed Jan 02, 2019 5:14 pm

Dear Muddassir,

TotWindV is an output from the FAST S-Function in Simulink, not an input.

Instead, in FAST v7 (both with and without the Simulink interface), wind is specified via the WindFile input parameter in the AeroDyn v13 input file--see the old FAST v7 and AeroDyn related documentation for more information:
https://nwtc.nrel.gov/system/files/FAST.pdf
https://nwtc.nrel.gov/system/files/AeroDyn.pdf
https://nwtc.nrel.gov/system/files/User ... erface.pdf

I'm not sure what you controller document you are asking for a link to.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Muddassir.Nawaz
Posts: 19
Joined: Mon Jan 15, 2018 1:57 am
Organization: Hochschule Bremerhaven
Location: Germany

Re: Pitch and Torque Cntrl (Region 3)

Postby Muddassir.Nawaz » Mon Jan 14, 2019 6:47 am

Dear jason,

I am trying to get "GenPwr" with Torque controller

Code: Select all

   1        VSContrl    - Variable-speed control mode {0: none, 1: simple VS, 2: user-defined from routine UserVSCont, 3: user-defined from Simulink/Labview} (switch)
1500        VS_RtGnSp   - Rated generator speed for simple variable-speed generator control (HSS side) (rpm) [used only when VSContrl=1]
318.31      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]
0.0001414   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]
9999.9e-9   VS_SlPc     - Rated generator slip percentage in Region 2 1/2 for simple variable-speed generator control (%) [used only when VSContrl=1]


i followed Control section of FAST User's guide, neglecting 21/2 region. But problem is, i am getting GenPwr around 80kW which should be 50kW.
My GBoxEff =98% , GenEff = 92.8% following https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&t=525 if i calculate my GenPwr is around 45-50kW, but output show 80kW.

Also HSShfV goes to 2500 rpm and LSSGagV goes to 120 rpm {even though RotSpeed =64.5 rpm is mentioned in "initial Conditions"} Why is generator and rotor speed so high?

Thank you
best regards
Muddassir Nawaz


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