Real-time relocation of floating offshore wind turbine platforms for wind farm efficiency maximization: An assessment of feasibility and steady-state potential

Kheirabadi, Ali C.; Nagamune, Ryozo

doi:10.1016/j.oceaneng.2020.107445

Cited by 29 publications

(25 citation statements)

References 23 publications

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“…Three values of anchor radii were used for each line 3D, 4D, and 5D. Following the approach presented in [4], the line length was defined as a function of the anchor radius and the sea water depth (equation 1):…”

Section: Anchor Radius (R) and Line Length (L)mentioning

confidence: 99%

“…Early investigations about the effect of moving the FOWT and how to benefit from it were discussed by [3][4][5][6][7]. [3] studied the effect of repositioning of FOWTs on energy production by simulating two turbines in a row facing the wind direction and forcibly moving the downwind turbine in the crosswind direction.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, moving the downwind turbine by a distance of 1D in the crosswind direction led to an increase of 41% in energy production. In order to make the FOWT move in the crosswind direction, [4][5][6] used the FOWT's controller to have a component of the aerodynamic thrust force perpendicular to the wind direction by varying the nacelle yaw angle and the induction factor. However, the motion of the FOWT was restricted by the design parameters of the mooring system.…”

Section: Introductionmentioning

confidence: 99%

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A parametric study of the mooring system design parameters to reduce wake losses in a floating wind farm

Mahfouz

Hall

Cheng

2022

J. Phys.: Conf. Ser.

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Wake effects inside a conventional fixed bottom wind farm decrease the power produced by the downwind turbines, hence decreasing the farm’s annual energy production (AEP). However, floating offshore wind turbines (FOWTs) have the ability to relocate their positions laterally through surge and sway motions. This flexibility provides a new degree of freedom (DOF) in the floating wind farm layout, which can be used to decrease the aerodynamic interactions inside the floating wind farm and hence decrease the wake losses. The lateral movement of FOWTs can be passively controlled by the mooring system design. The mooring system’s restoring characteristics allows the FOWT to only move within a specific area in the x-y plane known as the watch circle. Current state of the art mooring system designs are following oil and gas design basis where the floating platforms are not allowed to have large lateral displacements. In this work, we use full factorial design to analyse the effect of different mooring system design parameters on the ability of the floater to relocate its position. The analysis shows that each design parameter has a different way of affecting the FOWT’s response. The mooring lines’ headings control which wind directions cause the biggest displacements in the crosswind direction. The smaller the lines’ diameters the higher the displacements of the FOWT. Finally, the longer the line length the smaller the mooring system’s stiffness and hence the larger the FOWT’s displacement. The results of this study can be used as the basis for floating wind farm optimization, in which the wind turbines are allowed to passively relocate their positions according to the wind speed and wind direction.

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Section: Anchor Radius (R) and Line Length (L)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A parametric study of the mooring system design parameters to reduce wake losses in a floating wind farm

Mahfouz

Hall

Cheng

2022

J. Phys.: Conf. Ser.

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“…Turbine repositioning: This technology is only applicable to floating WPPs and consists in the modification of wind turbines location to minimize wake interaction 49,59 . This can be achieved either through direct actuators for platform displacement or through indirect effects of nacelle yaw and blade pitch control.…”

Section: Alignment Of Wffc With Grid and Electricity Markets Participationmentioning

confidence: 99%

Wind farm flow control oriented to electricity markets and grid integration: Initial perspective analysis

et al. 2021

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Wind farm control (WFC) allows coordinated operation of the wind turbines within a wind power plant (WPP). However, its development has traditionally been split into the distinct disciplines of power plant control and farm flow control. As variable renewable energies, in particular wind energy, increase their penetration into the power system, grid code requirements become stricter for WPPs and electricity markets necessarily evolve. In such a context, crossfertilization between the two categories of WFC, targeting an integrated approach where applicable, becomes a priority. An initial overview on how to further align wind farm flow control (WFFC) to grid and electricity markets participation is provided, including an analysis of capabilities and prospects. In addition, greater detail is given about an open‐access dataset serving as market showcases for value demonstration of price‐driven operation of WPPs by means of WFFC.

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“…Han and Nagamune [38] presented a strategy for repositioning the floating platform with the aim of minimizing the wake effect, by taking into account wind and wave profiles. Kheirabadi and Nagamune [39] presented a wind farm control concept to passively reposition FOWT focused on the so-called yaw and induction-based turbine repositioning strategy.…”

Section: Introductionmentioning

confidence: 99%

Optimal Micro-Siting of Weathervaning Floating Wind Turbines

et al. 2021

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This paper presents a novel tool for optimizing floating offshore wind farms based on weathervaning turbines. This solution is grounded on the ability of the assembly (wind turbine plus floater) to self-orientate into the wind direction, as this concept is allowed to freely pivot on a single point. This is a passive yaw potential solution for floating wind farms currently in the demonstration phase. A genetic algorithm is proposed for optimizing the levelised cost of energy by determining the geographical coordinates of the pivot points (i.e., the position over which the assembly can rotate to self-orient to the incoming wind direction). A tailored evaluation module is proposed to take into account the weathervaning motion around the pivot point depending on the incoming wind direction. The results obtained show the suitability of the proposed method to solve the addressed problem under realistic conditions. Additionally, the influence of the feasible region defined by the plot and the maximum area occupied on floating offshore wind farm design are also analysed in the proposed test cases. These deployable area constraints are of great importance for the viability of this technology, as it requires more space than classical solutions anchored to a fixed point.

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Real-time relocation of floating offshore wind turbine platforms for wind farm efficiency maximization: An assessment of feasibility and steady-state potential

Cited by 29 publications

References 23 publications

A parametric study of the mooring system design parameters to reduce wake losses in a floating wind farm

A parametric study of the mooring system design parameters to reduce wake losses in a floating wind farm

Wind farm flow control oriented to electricity markets and grid integration: Initial perspective analysis

Optimal Micro-Siting of Weathervaning Floating Wind Turbines

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