Validation of the dynamic wake meander model for loads and power production in the Egmond aan Zee wind farm

Larsen, Torben J.; Madsen, Helge Aagaard; Larsen, Gunner Chr.; Hansen, Kurt Schaldemose

doi:10.1002/we.1563

Cited by 176 publications

(186 citation statements)

References 31 publications

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“…The aeroelastic, structural and mechanical aspects are simulated in the state-of-art HAWC2 software developed at Technical University of Denmark (DTU) Wind Energy [20,21]. HAWC2 is an aeroelastic simulation code, which provides an advanced model for the flexible structure of wind turbines based on a multibody formulation.…”

Section: Wind Turbine Model For Numerical Simulationsmentioning

confidence: 99%

A Novel Wind Turbine Concept Based on an Electromagnetic Coupler and the Study of Its Fault Ride-through Capability

et al. 2013

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This paper presents a novel type of variable speed wind turbine with a new drive train different from the variable speed wind turbine commonly used nowadays. In this concept, a synchronous generator is directly coupled with the grid, therefore, the wind turbine transient overload capability and grid voltage support capability can be significantly improved. An electromagnetic coupling speed regulating device (EMCD) is used to connect the gearbox high speed shaft and synchronous generator rotor shaft, transmitting torque to the synchronous generator, while decoupling the gearbox side and the synchronous generator, so the synchronous generator torque oscillations during a grid fault are not transmitted to the gearbox. The EMCD is composed of an electromagnetic coupler and a one quadrant operation converter with reduced capability and low cost. A control strategy for the new wind turbine is proposed and a 2 MW wind turbine model is built to study the wind turbine fault ride-through capability. An integrated simulation environment based on the aeroelastic code HAWC2 and software Matlab/Simulink is used to study its fault ride-through capability and the impact on the structural loads during grid three phase and two phase short circuit faults.

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Section: Wind Turbine Model For Numerical Simulationsmentioning

confidence: 99%

A Novel Wind Turbine Concept Based on an Electromagnetic Coupler and the Study of Its Fault Ride-through Capability

et al. 2013

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“…The addition of the near-wake model in an aeroservoelastic code has an acceptable effect on the total computation speed. An aeroelastic simulation with the wind turbine code HAWC2 (Larsen and Hansen, 2007;Larsen et al, 2013;Kim et al, 2013), of the DTU 10 MW turbine (Bak et al, 2012) in normal operation with turbulent inflow, takes roughly 10 % (30 aerodynamic sections) to 40 % (55 aerodynamic sections) longer if the near-wake model is enabled than if a pure BEM model is used.…”

Section: Introductionmentioning

confidence: 99%

Comparison of a coupled near- and far-wake model with a free-wake vortex code

et al. 2017

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Abstract. This paper presents the integration of a near-wake model for trailing vorticity, which is based on a prescribed-wake lifting-line model proposed by Beddoes (1987), with a blade element momentum (BEM)-based far-wake model and a 2-D shed vorticity model. The resulting coupled aerodynamics model is validated against lifting-surface computations performed using a free-wake panel code. The focus of the description of the aerodynamics model is on the numerical stability, the computation speed and the accuracy of unsteady simulations. To stabilize the near-wake model, it has to be iterated to convergence, using a relaxation factor that has to be updated during the computation. Further, the effect of simplifying the exponential function approximation of the near-wake model to increase the computation speed is investigated in this work. A modification of the dynamic inflow weighting factors of the far-wake model is presented that ensures good induction modeling at slow timescales. Finally, the unsteady airfoil aerodynamics model is extended to provide the unsteady bound circulation for the near-wake model and to improve the modeling of the unsteady behavior of cambered airfoils. The model comparison with results from a free-wake panel code and a BEM model is centered around the NREL 5 MW reference turbine. The response to pitch steps at different pitching speeds is compared. By means of prescribed vibration cases, the effect of the aerodynamic model on the predictions of the aerodynamic work is investigated. The validation shows that a BEM model can be improved by adding near-wake trailed vorticity computation. For all prescribed vibration cases with high aerodynamic damping, results similar to those obtained by the free-wake model can be achieved in a small fraction of computation time with the proposed model. In the cases with low aerodynamic damping, the addition of trailed vorticity modeling shifts the results closer to those obtained by using the free-wake code, but differences remain.

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“…Similarly, one can change the model for the wake-wake superposition to, for example, one of the alternatives discussed by e.g. Larsen et al [36] in their validation of the dynamic wake meandering model. In addition, one could also adjust the wake expansion rate that is used in the far wake, see for example the work by Frandsen et al [30].…”

Section: Introductionmentioning

confidence: 99%

Generalized coupled wake boundary layer model: applications and comparisons with field and LES data for two wind farms

2016

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(2015)) focused on aligned or staggered wind-farms. The generalized CWBL approach combines an analytical Jensen wake model with a "top-down" boundary layer model coupled through an iterative determination of the wake expansion coefficient and an effective wake coverage area for which the velocity at hub-height obtained using both models converges in the "deep-array" portion (fully developed region) of the wind-farm. The approach accounts for the effect of the wind direction by enforcing the coupling for each wind direction.Here we present detailed comparisons of model predictions with LES results and field measurements for the Horns Rev and Nysted wind-farms operating over a wide range of wind inflow directions. Our results demonstrate that two-way coupling between the Jensen wake model and a "top-down" model enables the generalized CWBL model to predict the "deep-array" performance of a wind-farm better than the Jensen wake model alone. The results also show that the new generalization allows us to study a much larger class of wind-farms than the original CWBL model, which increases the utility of the approach for wind-farm designers. Copyright c 2016 John Wiley & Sons, Ltd. KEYWORDSJensen model, wake model, "top-down" model, coupled wake boundary layer (CWBL) model, power production, Horns Rev, Nysted, wind-farm Correspondence r.j.a.m.stevens@utwente.nl Received . . .

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Validation of the dynamic wake meander model for loads and power production in the Egmond aan Zee wind farm

Cited by 176 publications

References 31 publications

A Novel Wind Turbine Concept Based on an Electromagnetic Coupler and the Study of Its Fault Ride-through Capability

A Novel Wind Turbine Concept Based on an Electromagnetic Coupler and the Study of Its Fault Ride-through Capability

Comparison of a coupled near- and far-wake model with a free-wake vortex code

Generalized coupled wake boundary layer model: applications and comparisons with field and LES data for two wind farms

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