Deformable trailing edge geometries and cyclic pitch controller · Introduction (1:8) • 1958 Inaugurated. Purpose: Peaceful utilisation oflf nuclear energy • 1976 Oil crises (1973)

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Deformable trailing edge geometries and cyclic pitch controller

Buhl, Thomas; Andersen, Peter Bjørn

Published in:Proceedings (on CD-ROM)

Publication date:2008

Link back to DTU Orbit

Citation (APA):Buhl, T., & Andersen, P. B. (2008). Deformable trailing edge geometries and cyclic pitch controller. InProceedings (on CD-ROM) Sandia National Lab..

https://orbit.dtu.dk/en/publications/a26fa430-a2eb-4030-bd50-0d657141c514

Thomas Buhl Senior Scientist Risø-DTUPeter Bjørn Andersen Ph D Student Risø DTUPeter Bjørn Andersen Ph.D. Student Risø-DTU

IntroductionC t llControllerResultsConclusionConclusion

Introduction (1:8)

• 1958 Inaugurated. Purpose: Peaceful utilisation f lof nuclear energy

• 1976 Oil crises (1973) results in research in other Energy sourcesgy

• 1978 Research in Wind Energy starts• 1985 Political decision of not having nuclear

energy in Denmarkenergy in Denmark• 1994 State-owned enterprise• 2000 The last nuclear reactor is shut down2000 The last nuclear reactor is shut down• 2007 Merger with DTU, the Danish Institute for

Food and Veterinary Research, the Danish Institute for Fisheries Research the DanishInstitute for Fisheries Research, the Danish National Space Centre and the Danish Transport Research Institute

Introduction (2:8)Risø National LaboratoryA national laboratory under DTU

Risø total:900 employees

Wind Energy Dept.:120 employees

Systems Analysis Fuel cellsHydrogen storageHydrogen storagePV polymer cellsBio EnergyMaterials

Introduction (3:8)

Wind Energy Department

Educational P

International C ltiProgram Consulting

Wind Energy Test &Aeroelasticity Wind Turbines Wind EnergySystemsTest &

MeasurementsMeteorology

Introduction (4:8)

EllipSys (2D and 3D)EllipSys (2D and 3D)

HAWC2 (and HAWC)

HAWTOptHAWTOpt

HAWCStab (soon HAWCStab2)

Introduction (5:8)

Sensors and DTEG positions

Peter B. Andersen, Mac Gaunaa, Christian Bak, Helge Aa. MadsenFrederik Zahle, Joachim Heinz, Leonardo Bergami, Li Na, Andreas Fisher

DTEG P t ti

Introduction (6:8)DTEG Property assumptions:

10% of chord+/- 8 degree deflection possiblefrom +/ 8 to /+8 in simulated “dt” (=0 01s)from +/-8 to -/+8 in simulated dt (=0.01s)no effects of hysteresisno overshoot or other dynamicsmax ΔCL(α β=8deg) = 0 29max ΔCL(α,β=8deg) = 0.29min ΔCL(α,β=-8deg) = -0.29

Introduction (7:8)

Introduction (8:8)

Controller (1:6)

Controller (2:6)An ”inverse”An inverse Theodorsen/Gaunaa model

Possibility to use running averages or reference AOA values. (The Kα factor)

Objective: level out ”stochastic” signal AOA / Vrel

Controller (3:6)

An elastic response model

Objective: level out “deterministic” signalMj (bl d )Mj (blade root moment)

Controller (4:6)

Pitch communication model

Obj ti DTEG dObjective: DTEG and blade pitch work together

Controller (5:6)

pitch servo modeled as a 2nd order system

max pitch rate: 8 degree/sec

Power controller model:

Omega filter to removeOmega filter to remove”free-free” oscillations

Controller (6:6)

Cyclic pitch controllerInvers Coleman transformationtransformation

Notch filter

PI on yaw and tilt

Coleman transformationColeman transformation

additional pitch angle outputoutput

Results (1:6)

Results (1:6)

23%

67%

23%

@ 13 m/s

Results (1:6)

16%

23%53%

67%

23%

@ 20 m/s

@ 13 m/s

Results (2:6)

Results (3:6)

Results (4:6)

results (5:6)

results (6:6)

ConclusionConclusion

-The flaps with a +/-8 degree angle range seem to be able to eliminate almost all of the 30 degree yaw error

-Controllers needs to be integrated to see full potential

- Power production should be a part of the p p

-Tuning of controllers is very time consuming

Future work…

A “real” turbine

Main shaft (fatigue)

Acoustic noise reductionPower production

Extreme directional change in wind directionPosition of DTEG

Dimension of DTEG

Blade flapwise, extreme (bending, buckling)

Main shaft (fatigue)Extreme wind conditions (gusts)

Hardware in the loop

Tilting moment Yaw misalignment

T ldi (f i )Yaw system (extreme)

Blade edgewise (fatigue)Offshore

Floating turbines

Hardware in the loop

Tower welding (fatigue)

Main bearing (fatigue)Lightning

Stand stillNegative wind shears

CFD Gear (fatigue)

IEC Load case Pitch regulation

Wind farm issues Monte Carlo simulationsCFD

Sensor delaySensor dynamics/hysteresis

Foundation (extreme)

IEC Load case

Stability

g

Emergency shut down

Two bladed turbine

ySignal noise

Documents

Deformable trailing edge geometries and cyclic pitch controller · Introduction (1:8) • 1958 Inaugurated. Purpose: Peaceful utilisation oflf nuclear energy • 1976 Oil crises (1973)