Performance evaluation of an integrated floating energy system based on coupled analysis

Floating offshore wind turbines (FOWTs) still face many challenges in improving platform stability. A fully submersible FOWT platform with inclined side columns is designed to tackle the current technical bottleneck of the FOWT platform, combining the structural characteristics of the semi-submersible and Spar platform. An integrated numerical model of FOWT is established considering the fully coupled effect, and the hydrodynamic performance of the novel FOWT, the semi-submersible FOWT, and the Spar FOWT are compared and analyzed under different wave incidence angles and wave frequencies, as well as the blade and tower dynamic response of the three FOWTs under the coupling effect of wind, wave, and current. The results show that the novel floating platform can significantly optimize the hydrodynamic performance and has a better recovery ability after being subjected to external loads. The novel floating platform can significantly reduce the heave peak and its corresponding wave frequency compared to the semi-submersible platform, reducing the possibility of heave resonance. FOWT operation should ensure positive wave inflow as far as possible to avoid excessive wave forces in the lateral direction. Both blade and tower dynamic response are affected by rotor rotation and tower vibration to varying degrees, while tower dynamic response is mainly affected by platform motion. This study suggests that the application of the novel FOWT concept is feasible and can be an alternative in offshore wind exploitation in deep water.

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“…The numerical analysis method in this paper is implemented based on FAST and AQWA [25][26][27][28]. It contains:…”

Section: Development Of the Coupling Frameworkmentioning

confidence: 99%

Research on the Dynamic Performance of a Novel Floating Offshore Wind Turbine Considering the Fully-Coupled-Effect of the System

Zhang

Wang

Cai

et al. 2022

JMSE

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“…For the timedomain model, fully coupled six-degree-of-freedom motions are considered for the three models. Particularly for the analysis of the single FOWT and FWWP, a fully coupled aero-hydro-servo-elastic model is established based on AQWA using the F2A method proposed by Yang et al (2020).…”

Section: Mathematical Backgroundmentioning

confidence: 99%

“…By using AQWA, the parameters of Cummins equation are obtained from the frequency-domain results, and other effects such as the mooring system and PTO system are modelled as additional loads added into Cummins equation. The F2A method proposed by Yang et al (2020) is used to establish a dynamic coupling link between AQWA modules and the aero-servo-elastic modules of the OpenFAST, resulting in a fully coupled aero-hydro-servo-elastic-mooring-PTO time-domain model. In the AeroDyn module of OpenFAST, the aerodynamic load on the blades is calculated based on the blade element momentum (BEM) theory, which is mainly composed of lift and drag forces.…”

Section: Time-domain Modelmentioning

confidence: 99%

“…Based on the frequency-domain model, the complex hydrodynamic interaction and its effects on the wave power generation of the FWWP are analysed. The F2A method developed by Yang et al (2020) is applied here to establish a fully coupled time-domain model for the FWWP by using AQWA. The accuracy of the coupled model is validated with OpenFAST for analysing the dynamics of a single FOWT.…”

Section: Introductionmentioning

confidence: 99%

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Fully Coupled Analysis of an Integrated Floating Wind-Wave Power Generation Platform in Operational Sea-States

Chen

Xiao²,

Zhou³

et al. 2022

Front. Energy Res.

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The offshore wind power exploitation has experienced rapid development in recent years and has gradually moved into deeper waters with the floating wind turbine technology getting mature. Due to the strong concurrence of the wind and wave power in offshore sites, the idea of combined utilization of wind and wave power by one integrated device has attracted tremendous interests worldwide and a number of concepts and designs have been proposed. This article describes a novel integrated floating wind-wave generation platform (FWWP) consisting of a DeepCwind semi-submersible floating offshore wind turbine (FOWT) and a point absorber wave energy convertor (PAWEC). Three models including the single PAWEC, single FOWT, and FWWP are considered to investigate the feasibility of the FWWP and its advantages over the single device. Hydrodynamic analyses are first conducted using the potential flow code AQWA with the viscous correction to investigate the hydrodynamic interactions effect of the integrated model. Then, a fully coupled model for the FWWP is established by calling OpenFAST in AQWA using the F2A method. The accuracy of the established coupled model is firstly validated with OpenFAST for analysing the dynamics of the single FOWT. Finally, fully coupled analyses of the FWWP are carried out for both regular and irregular waves in the operational sea-states. The coupled dynamics and wind and wave power generation of the FWWP are compared with those of the single PAWEC and FOWT for both the regular and irregular waves.

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“…The tangential induction velocity is obtained using the BEMT. The lift and drag coefficients are called by looking up the aerodynamic performance tables of each blade sectional airfoil to calculate the aerodynamic loads on each blade using the equations will be then calculated through the following equations [29]:…”

Section: Description Of the Aero-servo-elastic Modeling In F2amentioning

confidence: 99%

Effects of Second-Order Hydrodynamics on the Dynamic Responses and Fatigue Damage of a 15 MW Floating Offshore Wind Turbine

Mei¹,

Xiong

2021

JMSE

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In order to investigate the effects of second-order hydrodynamic loads on a 15 MW floating offshore wind turbine (FOWT), this study employs a tool that integrates AQWA and OpenFAST to conduct fully coupled simulations of the FOWT subjected to wind and wave loadings. The load cases covering normal and extreme conditions are defined based on the met-ocean data observed at a specific site. The results indicate that the second-order wave excitations activate the surge mode of the platform. As a result, the surge motion is increased for each of the examined load case. In addition, the pitch, heave, and yaw motions are underestimated when neglecting the second-order hydrodynamics under the extreme condition. First-order wave excitation is the major contributor to the tower-base bending moments. The fatigue damage of the tower-base under the extreme condition is underestimated by 57.1% if the effect of second-order hydrodynamics is ignored. In addition, the accumulative fatigue damage over 25 years at the tower-base is overestimated by 16.92%. Therefore, it is suggested to consider the effects of second-order wave excitations of the floating platform for the design of the tower to reduce the cost of the FOWT.

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Performance evaluation of an integrated floating energy system based on coupled analysis

Cited by 40 publications

References 39 publications

Research on the Dynamic Performance of a Novel Floating Offshore Wind Turbine Considering the Fully-Coupled-Effect of the System

Research on the Dynamic Performance of a Novel Floating Offshore Wind Turbine Considering the Fully-Coupled-Effect of the System

Fully Coupled Analysis of an Integrated Floating Wind-Wave Power Generation Platform in Operational Sea-States

Effects of Second-Order Hydrodynamics on the Dynamic Responses and Fatigue Damage of a 15 MW Floating Offshore Wind Turbine

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