A comparison of extreme structural responses and fatigue damage of semi-submersible type floating horizontal and vertical axis wind turbines

Cheng, Zhengshun; Madsen, Helge Aagaard; Chai, Wei; Gao, Zhen; Moan, Torgeir

doi:10.1016/j.renene.2017.02.067

Cited by 57 publications

(19 citation statements)

References 19 publications

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“…Therefore, the extrapolated up-crossing rate is used hereafter to estimate the extreme PTO force. Please refer to Refs [24,25] for details of the extrapolation technique. Regardless of the wave conditions, the mean up-crossing rate is raised significantly with real-time control.…”

Section: B Excursion and Load Of Ptomentioning

confidence: 99%

Development of a Real-Time Latching Control Algorithm Based on Wave Force Prediction

Wang

Gao

2021

IEEE J. Oceanic Eng.

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Optimal wave energy control is non-causal as the control command is optimized based on incoming wave force. Therefore, implementation of wave energy control requires forecasting of future wave force. A real-time latching control algorithm based on short-term wave force prediction is developed in this study to tackle such non-causality. The future wave forces are forecasted using the grey model. The receding horizon strategy is used to optimize the control command online and over the prediction horizon interval. Based on the predicted wave forces, the power extraction is maximized by locking and releasing the buoy alternately according to the optimized control command. Simulation results show that the power extraction is increased substantially with implementation of the developed real-time latching control algorithm, even if the future wave forces are predicted. Effects of prediction length and prediction error on the energy conversion are examined. It is found that more wave energy is harvested when a long prediction length is employed whilst prediction error decreases the control efficiency. The extreme load of power takeoff system increases when the wave energy control is implemented although its travel distance is hardly varied.

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Section: B Excursion and Load Of Ptomentioning

confidence: 99%

Development of a Real-Time Latching Control Algorithm Based on Wave Force Prediction

Wang

Gao

2021

IEEE J. Oceanic Eng.

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“…Amandolèse and Hémon 2010; Païdoussis et al 2011). Thorough knowledge on these aspects is required when studying the much more complicated flow behaviour of multi-cylinder and multi-prism structures, like offshore platforms and floating wind turbines (Gonçalves et al 2012(Gonçalves et al , 2013Cheng et al 2017), industrial heat exchangers (Mangrulkar et al 2019), high-rise districts (Irwin et al 2013;Zu and Lam 2018) and cable-stayed bridges (Tanaka 2003;Virlogeux 2005;Nikitas and Macdonald 2015).…”

Section: Introductionmentioning

confidence: 99%

Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows

Hinsberg

2021

Exp Fluids

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The aerodynamics of smooth and slightly rough prisms with square cross-sections and sharp edges is investigated through wind tunnel experiments. Mean and fluctuating forces, the mean pitch moment, Strouhal numbers, the mean surface pressures and the mean wake profiles in the mid-span cross-section of the prism are recorded simultaneously for Reynolds numbers between 1$$\times$$ × 10$$^{5}$$ 5 $$\le$$ ≤ Re$$_{D}$$ D $$\le$$ ≤ 1$$\times$$ × 10$$^{7}$$ 7 . For the smooth prism with $$k_s$$ k s /D = 4$$\times$$ × 10$$^{-5}$$ - 5 , tests were performed at three angles of incidence, i.e. $$\alpha$$ α = 0$$^{\circ }$$ ∘ , −22.5$$^{\circ }$$ ∘ and −45$$^{\circ }$$ ∘ , whereas only both “symmetric” angles were studied for its slightly rough counterpart with $$k_s$$ k s /D = 1$$\times$$ × 10$$^{-3}$$ - 3 . First-time experimental proof is given that, within the accuracy of the data, no significant variation with Reynolds number occurs for all mean and fluctuating aerodynamic coefficients of smooth square prisms up to Reynolds numbers as high as $$\mathcal {O}$$ O (10$$^{7}$$ 7 ). This Reynolds-number independent behaviour applies to the Strouhal number and the wake profile as well. In contrast to what is known from square prisms with rounded edges and circular cylinders, an increase in surface roughness height by a factor 25 on the current sharp-edged square prism does not lead to any notable effects on the surface boundary layer and thus on the prism’s aerodynamics. For both prisms, distinct changes in the aerostatics between the various angles of incidence are seen to take place though. Graphic abstract

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“…In practice, the ultimate limit state and fatigue limit state are essential items in the design of an offshore renewable energy device. Cheng et al [20] compared the extreme structural response and fatigue damage of a horizontal axis floating wind turbine and a vertical axis floating wind turbine. Hu et al [21] developed an integrated structural strength analysis method for a spar type floating wind turbine.…”

Section: Introductionmentioning

confidence: 99%

Short-term extreme response and fatigue damage of an integrated offshore renewable energy system

Cheng

Yuan

et al. 2018

Renewable Energy

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This study addresses short-term extreme response and fatigue damage of an integrated wind, wave and tidal energy system. The integrated concept is based on the combination of a spar type floating wind turbine, a wave energy converter and two tidal turbines. Aero-hydro-mooring coupled analysis is performed in time-domain to capture the dynamic response of the combined concept in a set of environmental conditions. The mean up-crossing rate method is used to evaluate the extreme response, which takes advantage of an extrapolation method to reduce the simulation sample size. The cumulative fatigue damage is computed based on the S-N method. Simulation results show that the tower base foreaft bending moment is improved, in terms of extreme value and fatigue damage. Nevertheless, the tension force of a mooring line is worsened. The mooring line bears increased maximum tension due to the tidal turbine thrust force and it is subjected to higher fatigue damage load as well.

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A comparison of extreme structural responses and fatigue damage of semi-submersible type floating horizontal and vertical axis wind turbines

Cited by 57 publications

References 19 publications

Development of a Real-Time Latching Control Algorithm Based on Wave Force Prediction

Development of a Real-Time Latching Control Algorithm Based on Wave Force Prediction

Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows

Short-term extreme response and fatigue damage of an integrated offshore renewable energy system

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