Physics informed DMD for periodic Dynamic Induction Control of Wind Farms

Muscari, C; Schito, Paolo; Viré, Axelle; Zasso, Alberto; Hoek, Daan van der; Wingerden, J. van

doi:10.1088/1742-6596/2265/2/022057

Cited by 9 publications

(9 citation statements)

References 16 publications

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“…Muscari et al. (2022) conducted a dynamic mode decomposition of a wake of a turbine with the helix approach and find that helicoidal shapes at the frequency of the excitation and its harmonics are the dominant modes of the wake. Furthermore, the authors report, in contrast to Frederik et al.…”

Section: Introductionmentioning

confidence: 99%

“…Axial induction control reduces the induction of upstream turbines, such that downstream turbines can produce more power; see, for example, Nilsson et al (2015). Some studies also combine these two strategies (Bossanyi 2018).…”

Section: Introductionmentioning

confidence: 99%

“…They observed that the helix incites significant yawing of the turbine, further aiding the wake recovery process. Muscari et al (2022) conducted a dynamic mode decomposition of a wake of a turbine with the helix approach and find that helicoidal shapes at the frequency of the excitation and its harmonics are the dominant modes of the wake. Furthermore, the authors report, in contrast to Frederik et al (2020), an optimal Strouhal number for the helix approach is 0.4.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The characteristics of helically deflected wind turbine wakes

Korb¹,

Asmuth²,

Ivanell³

2023

J. Fluid Mech.

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The helix approach is a new individual pitch control method to mitigate wake effects of wind turbines. Its name is derived from the helical shape of the wake caused by a rotating radial force exerted by the turbine. While its potential to increase power production has been shown in previous studies, the physics of the helical wake are not well understood to date. Open questions include whether the increased momentum in the wake stems from an enhanced wake mixing or from the wake deflection. Furthermore, its application to a row of more than two turbines has not been examined before. We study this approach in depth from both an analytical and numerical perspective. We examine large-eddy simulations (LES) of the wake of a single turbine and find that the helix approach exhibits both higher entrainment and notable deflection. As for the application to a row of turbines, we show that the phase difference between two helical wakes is independent of ambient turbulence. Examination of LES of a row of three turbines shows that power gains greatly depend on the phase difference between the helices. We find a maximum increase in the total power of approximately 10 % at a phase difference of $270^\circ$ . However, we do not optimise the phase difference any further. In summary, we provide a set of analytical tools for the examination of helical wakes, show why the helix approach is able to increase power production, and provide a method to extend it to a wind farm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The characteristics of helically deflected wind turbine wakes

Korb¹,

Asmuth²,

Ivanell³

2023

J. Fluid Mech.

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“…It should be noted that the default pitch rate limits of the IEA-15 MW turbine have to be increased if β > 4 • in order to enable helix pitch actuation. All helix cases in this study use the most common helix actuation frequency of St = 0.25, but we do note that there is still uncertainty not only in the optimal amplitude but also frequency [8]. Note that the helix is only implemented for the upstream turbine (denoted as T1).…”

Section: Turbine Simulationsmentioning

confidence: 99%

“…For the initial proof of concept, the frequency is derived from DIC as St = 0.25 and the influence of the amplitude is analyzed for two levels [6]. A study for a single amplitude, but four different Strouhal numbers suggested that the optimal frequency might deviate from St = 0.25, although only considering uniform inflow [8]. In [9] reinforcement learning was applied to optimize the helix amplitude for a three-turbine wind farm (St = 0.25) reporting an overall power gain of 6.8%.…”

Section: Introductionmentioning

confidence: 99%

On the performance of the helix wind farm control approach in the conventionally neutral atmospheric boundary layer

Taschner,

van Vondelen,

Verzijlbergh

et al. 2023

J. Phys.: Conf. Ser.

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The performance of wind farms can substantially increase when their individual turbines deviate from their own greedy control strategy and instead also take into account downstream turbines operating in the wake. The helix approach is a recently introduced dynamic wind farm control strategy that tackles this issue by leveraging individual pitch control to accelerate wake recovery. Its effective implementation requires detailed knowledge about the scaling between control input and the resulting power gain and turbine loading across the farm. In the present work this scaling is explored by means of large-eddy simulation of a two-turbine farm in the conventionally neutral atmospheric boundary layer. A parameter sweep for the amplitude of the helix is performed showing monotonous increase of the farm’s power output with increasing pitch amplitude within the considered range of zero to six degrees. The scaling of the power gain suggests that a threshold amplitude should be exceeded for effective speed-up of the wake recovery, whereas the damage equivalent loads computed for the turbines indicate an upper limit for the amplitude despite increasing power gains.

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Maximizing wind farm power output with the helix approach: Experimental validation and wake analysis using tomographic particle image velocimetry

van der Hoek,

den Abbeele,

Simao Ferreira

et al. 2024

Wind Energy

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Wind farm control can play a key role in reducing the negative impact of wakes on wind turbine power production. The helix approach is a recent innovation in the field of wind farm control, which employs individual blade pitch control to induce a helical velocity profile in a wind turbine wake. This forced meandering of the wake has turned out to be very effective for the recovery of the wake, increasing the power output of downstream turbines by a significant amount. This paper presents a wind tunnel study with two scaled wind turbine models of which the upstream turbine is operated with the helix approach. We used tomographic particle image velocimetry to study the dynamic behavior of the wake under the influence of the helix excitation. The measured flow fields confirm the wake recovery capabilities of the helix approach compared with normal operation. Additional emphasis is put on the effect of the helix approach on the breakdown of blade tip vortices, a process that plays an important role in re‐energizing the wake. Measurements indicate that the breakdown of tip vortices and the resulting destabilization of the wake are enhanced significantly with the helix approach. Finally, turbine measurements show that the helix approach was able to increase the combined power for this particular two‐turbine setup by as much as 15%.

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Physics informed DMD for periodic Dynamic Induction Control of Wind Farms

Cited by 9 publications

References 16 publications

The characteristics of helically deflected wind turbine wakes

The characteristics of helically deflected wind turbine wakes

On the performance of the helix wind farm control approach in the conventionally neutral atmospheric boundary layer

Maximizing wind farm power output with the helix approach: Experimental validation and wake analysis using tomographic particle image velocimetry

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