Abstract
Spar-type floating offshore wind turbines commonly vibrate excessively when under the coupling impact of wind and wave. The wind turbine vibration can be controlled by developing its mooring system. Thus, this study proposes a novel mooring system for the spar-type floating offshore wind turbine. The proposed mooring system has six mooring lines, which are divided into three groups, with two mooring lines in the same group being connected to the same fairlead. Subsequently, the effects of the included angle between the two mooring lines on the mooring-system’s performance are investigated. Then, these six mooring lines are connected to six independent fairleads for comparison. FAST is utilized to calculate wind turbine dynamic response. Wind turbine surge, pitch, and yaw movements are presented and analyzed in time and frequency domains to quantitatively evaluate the performances of the proposed mooring systems. Compared with the mooring system with six fairleads, the mooring system with three fairleads performed better. When the included angle was 40°, surge, pitch, and yaw movement amplitudes of the wind turbine reduced by 39.51%, 6.8%, and 12.34%, respectively, when under regular waves; they reduced by 56.08%, 25.00%, and 47.5%, respectively, when under irregular waves. Thus, the mooring system with three fairleads and 40° included angle is recommended.
Highlights
As one of the clean and renewable energy resources, wind energy has been harvested extensively worldwide
In contrast with onshore wind turbines, offshore wind turbines are generally located in a better wind environment that has a higher wind speed and lower turbulence intensity than on land; there is no need to worry about noise caused by offshore wind turbines because they are away from the coast
OC3-Hywind spar-type 5 MW offshore wind turbine, which is moored onto the seabed using three mooring lines
Summary
As one of the clean and renewable energy resources, wind energy has been harvested extensively worldwide. The TMD’s structural parameters were optimized through parametric analysis Their numerical results implied that a TMD could passively control wind turbine vibration, and tower top and nacelle movements could be significantly reduced by 10%. This study tries to reduce spar-type floating offshore wind turbine vibration by developing an original mooring system which has negligible effects on the wind turbine’s construction and maintenance costs. The experiment is not suitable for the mooring system optimization that is needed to evaluate the various cases in this study To this end, numerical simulation was adopted; FAST [15] was utilized to simulate the wind and wave interactions of floating offshore wind turbines. Pitch, and yaw movements are presented and analyzed in time- and frequency-domain to quantitatively evaluate the mooring system performance
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