Periodic stability analysis of wind turbines operating in turbulent wind conditions

Riva, Riccardo; Cacciola, Stefano; Bottasso, Carlo L.

doi:10.5194/wes-1-177-2016

Cited by 20 publications

(5 citation statements)

References 34 publications

(50 reference statements)

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“…When the blades flex into and out of the wind, the rotor interacts with its own vorticity, calling the accuracy of the design assumptions into question. Additionally, structural dynamics of blades incorporating composite materials, built-in curvature and sweep, and large nonlinear deflection (including torsion and bend-twist coupling) further complicate models of the physics (69) and the assessment of crucial design aspects such as stability (70,71). In fact, although aeroelastic stability has typically not been a key design driver for rotor blades up to now, the situation may change for future highly flexible and large rotors.…”

Section: First Grand Challenge: Improved Understanding Of Atmosphericmentioning

confidence: 99%

Grand challenges in the science of wind energy

Veers

Dykes

Lantz

et al. 2019

Science

Self Cite

664

342

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Harvested by advanced technical systems honed over decades of research and development, wind energy has become a mainstream energy resource. However, continued innovation is needed to realize the potential of wind to serve the global demand for clean energy. Here, we outline three interdependent, cross-disciplinary grand challenges underpinning this research endeavor. The first is the need for a deeper understanding of the physics of atmospheric flow in the critical zone of plant operation. The second involves science and engineering of the largest dynamic, rotating machines in the world. The third encompasses optimization and control of fleets of wind plants working synergistically within the electricity grid. Addressing these challenges could enable wind power to provide as much as half of our global electricity needs and perhaps beyond.

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Section: First Grand Challenge: Improved Understanding Of Atmosphericmentioning

confidence: 99%

Grand challenges in the science of wind energy

Veers

Dykes

Lantz

et al. 2019

Science

Self Cite

664

342

View full text Add to dashboard Cite

show abstract

“…Furthermore, the computational requirements for stability can be significant, limiting the use of stability metrics in the design process. Finally, fully coupled aeroelastic simulations with blade-resolved computational fluid dynamics (CFD) are computationally expensive, and coupled aeroelastic effects (e.g., flutter, stall, and vortexinduced vibration) are active research topics [5,6,7,8]. Therefore, the field can benefit from computationally efficient but representative models to study aeroelastic stability.…”

Section: Introductionmentioning

confidence: 99%

A generalized wind turbine cross section as a reduced-order model to gain insights in blade aeroelastic challenges

Branlard,

Jonkman,

Porter

et al. 2024

J. Phys.: Conf. Ser.

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In this work, we present an approach to study the aeroelastic stability of a wind turbine by focusing on the dynamics of a blade cross section. We present a methodology to obtain a reduced-order model of the blade dynamics in the form of generalized cross-sectional quantities that approximates the aerodynamic and structural properties of the full blade. The motivation for the work is to gain a physical understanding of the influence of aerodynamic models such as dynamic wake and dynamic stall on the frequency and damping of the structure using a reduced-order model with low computational cost. The model may be coupled to two-dimensional computational fluid dynamics softwares or engineering unsteady airfoil aerodynamics models accounting for dynamic wake and dynamic stall. In the latter case, we can obtain monolithic state-space forms of the aeroelastic system of equations, which simplifies the determination of the modal parameters and therefore the study of stability. The work investigates wind turbines in operation or at standstill, where vortex-induced vibrations and stall-induced vibrations, respectively, might be an issue. The implementation is made available as part of the open-source Python package WELIB and as part of the open-source unsteady aerodynamic driver of OpenFAST.

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“…An alternative approach has been described in Bottasso and Cacciola [16] and Riva et al [17], where a numerical wind turbine model is excited to identify a single-input/single-output periodic reduced model from the recorded response. The full Floquet theory is then performed on the reduced-order model.…”

Section: Introductionmentioning

confidence: 99%

Wind Turbine Aeroelastic Stability in OpenFAST

Bortolotti,

Chetan,

Branlard

et al. 2024

J. Phys.: Conf. Ser.

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Wind turbines are growing in size and increasingly suffer from aeroelastic instabilities. Unfortunately, numerical models often show inconsistent results during verification studies. We address this gap by first introducing novel linearization capabilities within the open-source aero-hydro-servo-elastic framework OpenFAST. Next, a code-to-code benchmark study is presented that compares modal parameters between OpenFAST and HAWCStab2 for a land-based version of the International Energy Agency 15-MW reference wind turbine modeled with quasi-steady aerodynamics. The two solvers are in strong agreement except for discrepancies in the second rotor flapwise modes. The differences are attributed to the torsional flexibility of the tower, which is assumed torsionally stiff in the OpenFAST model. Work is ongoing to close this modeling gap. The aeroelastic stability of a low-specific-power land-based wind turbine is also investigated. The impact of design choices is discussed, high-lighting how narrow the margins are between a stable design and an unstable design.

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Periodic stability analysis of wind turbines operating in turbulent wind conditions

Cited by 20 publications

References 34 publications

Grand challenges in the science of wind energy

Grand challenges in the science of wind energy

A generalized wind turbine cross section as a reduced-order model to gain insights in blade aeroelastic challenges

Wind Turbine Aeroelastic Stability in OpenFAST

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