Optimal design and performance analysis of a hybrid system combining a semi-submersible wind platform and point absorbers

Zhou, Binzhen and Hu, Jianjian and Zhang, Qi and Wang, Lei and Jing, Fengmei and Collu, Maurizio (2023) Optimal design and performance analysis of a hybrid system combining a semi-submersible wind platform and point absorbers. Journal of Marine Science and Engineering, 11 (6). 1190. ISSN 2077-1312 (https://doi.org/10.3390/jmse11061190)

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Abstract

Integrating point absorber wave energy converters (PAWECs) and an offshore floating wind platform provide a cost-effective way of joint wind and wave energy exploitation. However, the coupled dynamics of the complicated hybrid system and its influence on power performance are not well understood. Here, a frequency-domain-coupled hydrodynamics, considering the constraints and the power output through the relative motion between the PAWECs and the semi-submersible platform, is introduced to optimize the size, power take-off damping, and layout of the PAWECs. Results show that the annual wave power generation of a PAWEC can be improved by 30% using a 90° conical or a hemispherical bottom instead of a flat bottom. Additionally, while letting the PAWECs protrude out the sides of the triangular frame of the platform by a distance of 1.5 times the PAWEC radius, the total power generation can be improved by up to 18.2% without increasing the motion response of the platform. The PAWECs can reduce the resonant heave motion of the platform due to the power take-off damping force. This study provides a reference for the synergistic use of wave and wind energy

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