The influence of power-take-off control on the dynamic response and power output of combined semi-submersible floating wind turbine and point-absorber wave energy converters

Si, Yulin; Zheng, Chao; Zeng, Weijian; Sun, Jili; Zhang, Dahai; Ma, Xiandong; Qian, Peng

doi:10.1016/j.oceaneng.2021.108835

Cited by 108 publications

(20 citation statements)

References 24 publications

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“…These results contrast well with the more specific design focused studies of hybrid wind and WEC systems in the literature. The conclusions, with respect to the power generated by the WEC, support the findings of studies such as [17,20,21,39,40], which show that there is the potential to produce a promising amount of power from a hybrid system, whether that be with a single or multiple WECs. The relative capture width results also give support to the design ideas of [17,21,40], which use multiple smaller WECs to generate power rather than fewer larger ones.…”

Section: Summary Of Resultssupporting

confidence: 79%

“…The conclusions, with respect to the power generated by the WEC, support the findings of studies such as [17,20,21,39,40], which show that there is the potential to produce a promising amount of power from a hybrid system, whether that be with a single or multiple WECs. The relative capture width results also give support to the design ideas of [17,21,40], which use multiple smaller WECs to generate power rather than fewer larger ones. However, with respect to net power generation, this work shows that the optimal power per BA size requires much larger BAs than considered in prior works.…”

Section: Summary Of Resultssupporting

confidence: 79%

“…In contrast to other works, such as [21,40], it was found that for the optimal amount of power to be generated through the WEC system, the result is an appreciable amplification of spar motions rather than suppression of them. This is not to say that the WEC system cannot suppress spar motions as found for other hybrid wind and WEC models, but rather implies that to both suppress spar motions and generate power, compromises need to be made; a similar finding has been made in the analysis of the specific hybrid platform proposed in [17].…”

Section: Summary Of Resultsmentioning

confidence: 90%

“…A number of prototype designs have been proposed with respect to the design of a floating wind and wave hybrid platform. These include designs such as W2Power [16], Poseidon37/80 [1], WindWaveFloat [13], DeepCwind-Wavestar-Combined [17], and others [18,19]. These designs can differ significantly.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the floating hybrid platform can have one or multiple wind turbines; can be of a spar, barge, or semi-submersible platform variety; can use WECs of the point absorber, overturning, or oscillating water column variety; can use multiple or single WEC devices; for the point absorber, WEC variation can have heaving, pitching, or multiple degree of freedom attachments; and many other minor design eccentricities. Nonetheless, these devices primarily tend towards having WECs of the point absorber variety, and the research work focuses on the power production the WECs can achieve as well as the resultant dynamics of the hybrid platform [1,17,[19][20][21]. As is expected in the early prototyping phase, the research on these floating hybrid platforms focuses on the design and optimisation of a particular specific design rather than developing a more general perspective on the consequences of attaching a point absorber to a floating wind platform.…”

Section: Introductionmentioning

confidence: 99%

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The Prospect of Combining a Point Absorber Wave Energy Converter with a Floating Offshore Wind Turbine

et al. 2021

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With recent advances in offshore floating wind and wave energy technology, questions have emerged as to whether the two technologies can be combined to reduce their overall levelised cost of energy. In this paper, the potential for combining a floating offshore wind turbine to a point absorbing wave energy converter is investigated. The focus of the investigation is how much power might be produced by a combined floating wind and wave energy converter system, and the resultant changes in motion of the floating wind platform. A model for the combined wave and wind system is developed which uses the standardised NREL OC3 5 MW spar type wind turbine and a cylindrical buoyant actuator (BA), which is attached to the spar via a generic wave power take-off system (modelled as a spring-damper system). Modelling is conducted in the frequency domain and the tests span a wide range of parameters, such as wave conditions, BA sizes, and power take-off coupling arrangements. It is found that the optimal (with respect to power production) BA size is a draft and radius of approximately 14 m. It is found that this BA can theoretically produce power in the range of 0.3 to 0.5 MW for waves with a significant wave height of 2 m, and has the potential to produce power greater or near to 1 MW for waves with a significant wave height of at least 3 m. However, it is also found that, in terms of the relative capture width, significantly smaller BAs are optimal, and that these smaller BA sizes less significantly alter the motion of the floating wind platform.

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