Active pitch control of tethered wings for airborne wind energy

Buffoni, Marcelo; Galletti, Bernardo; Ferreau, J.; Fagiano, Lorenzo; Mercangoez, M.

doi:10.1109/cdc.2014.7040153

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…The controllers are made robust with respect to the unmodeled dynamics and the parameter uncertainties according to the small-gain theorem. The proposed method is more practical for the systems with a rigid-wing, due to the difficulty of measurement and control of the angle of attack for the soft kites [13].…”

Section: Introductionmentioning

confidence: 99%

Robust Variable-Speed Variable-Pitch Power Regulation of Tethered-Wing Systems Based on Gain-Scheduled H-infinity Synthesis

Kakavand¹,

Nikoobin²

2022

Preprint

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This paper deals with the power regulation of tethered-wing systems while considering the robust performance and the mitigation of dynamic mechanical loads and power fluctuations. The strategy is to maximize the energy capture during low-speed wind by controlling the reeling-speed and limiting it during high-speed wind by adjusting both the tether's force and the speed. The H ∞ method is employed to synthesize the output-feedback controllers while making compromises between the control objectives. The synthesis procedure is based on a linear parameter varying (LPV) system that expresses the flexible longitudinal dynamics of the reeling-mechanism, the tether, and the kite. We carry out various simulations to demonstrate the controllers' performance, including the implementation of the control strategy in a 3-dimensional tethered-wing system simulator with a realistic turbulent wind field

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Section: Introductionmentioning

confidence: 99%

Robust Variable-Speed Variable-Pitch Power Regulation of Tethered-Wing Systems Based on Gain-Scheduled H-infinity Synthesis

Kakavand¹,

Nikoobin²

2022

Preprint

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Unsteady Aerodynamics of Delta Kites for Airborne Wind Energy Under Dynamic Stall Conditions

Castro‐Fernández,

Cavallaro,

Schmehl

et al. 2024

Wind Energy

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Three unsteady aerodynamic tools at different levels of fidelity and computational cost were used to investigate the unsteady aerodynamic behavior of a delta kite applied to airborne wind energy. The first tool is an in‐house unsteady panel method that is fast but delivers low to mid fidelity predictions. The second tool uses the open‐source CFD code SU2 to solve the unsteady Reynolds‐averaged Navier–Stokes equations with the SST turbulence model. At an intermediate level of fidelity, a semiempirical dynamic stall model that combines the panel method with a phenomenological dynamic stall module is proposed. The latter has free parameters that are fine‐tuned with CFD results from the second tool. The research on the dynamic stall model has been inspired by two flight test campaigns suggesting dynamic stall phenomena possibly driven by the periodic variation of the angle of attack (aerodynamic pitching motion) during crosswind maneuvers. The recorded inflow along the flight path was prescribed in the three aerodynamic tools. As expected, the price to pay for the low computational cost of the panel method is its inability to capture the dynamic stall phenomenon. The results from unsteady CFD qualitatively matched the experimental data identifying a leading‐edge vortex that forms and detaches cyclically during the pitching motion. Using RANS data, the semiempirical tool was fined‐tuned to reproduce the dynamic stall behavior, becoming an accurate and fast aerodynamic tool for coupling with any kite flight simulator. Further discussions on the effects of kite aerostructural deflections are included.

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Attitude tracking control of a GroundGen airborne wind energy system

Olinger

Demetriou

2016

2016 American Control Conference (ACC)

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Active pitch control of tethered wings for airborne wind energy

Cited by 6 publications

References 9 publications

Robust Variable-Speed Variable-Pitch Power Regulation of Tethered-Wing Systems Based on Gain-Scheduled H-infinity Synthesis

Robust Variable-Speed Variable-Pitch Power Regulation of Tethered-Wing Systems Based on Gain-Scheduled H-infinity Synthesis

Unsteady Aerodynamics of Delta Kites for Airborne Wind Energy Under Dynamic Stall Conditions

Attitude tracking control of a GroundGen airborne wind energy system

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