Coupled Response of Flexible Multi-Buoy Offshore Floating Photovoltaic Array under Waves and Currents

Xing-Hua Shi, Yiming Wang,Jing Zhang, C. Guedes Soares, Honglong Li, Jia Yu

Journal of Marine Science and Engineering（2025）

Zhongtian Technology Marine Engineering Co. | Huadian Heavy Industries Co.

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Abstract

To study the response of a flexible offshore floating photovoltaic (FPV) array under waves and a current, a numerical model is established using OrcaFlex. The effects of different waves and currents, as well as their coupled effects on the motion response of the offshore PFV array and the tension in the connectors and moorings under different static tensions, are investigated. Differences are illustrated between the responses of the buoys at different positions and under different moorings under the wave. With the relaxed moorings, the surge response of the buoy facing the wave increased by 159.3% compared with the buoy facing away from the wave. The current causes the overall drift of the array, which greatly influences the buoys facing the current. The mooring tension facing the wave restricts the motion of the buoys under the same direction as the wave and current, which shows that the trend of the buoys’ responses with the wave decreases with the increase in the current velocity, as the pitch reduces to 76.9% under relaxed moorings. There is a significant difference between the results obtained by the superposition summation wave and current loads and the ones of the combined wave–current. With the increase in the wave–current angle, the response is increased by 348.2% as the constraint of the moorings and the connectors is weakened.

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Key words

offshore floating photovoltaic,multi-buoy array,coupled response,connector tension

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【要点】：研究建立了一个数值模型，使用OrcaFlex软件来探究波浪和海流耦合作用下柔性浮式光伏阵列的响应，发现了不同位置浮标及不同系泊方式下响应的差异和变化规律。

【方法】：采用OrcaFlex软件建立浮式光伏阵列的数值模型，通过模拟不同波浪和海流条件及其耦合作用，分析阵列的运动响应和连接件、系泊线的张力。

【实验】：通过模拟实验，研究了在波浪和海流单独作用及耦合作用下，不同静态张力条件下浮标阵列的运动响应和系泊张力，发现面向波浪的浮标在松弛系泊条件下 surge 响应增加了159.3%，而海流引起了阵列的整体漂移，并对面向海流的浮标产生显著影响。在波浪和海流相同方向作用下，系泊张力限制了浮标的运动，使得波浪引起的浮标响应趋势随海流速度增加而降低，例如在松弛系泊条件下 pitch 降低至76.9%。同时，研究发现叠加法计算得到的波浪和海流载荷结果与实际耦合作用下的结果存在显著差异，随着波浪-海流角度的增加，响应增加了348.2%。实验使用的数据集为模拟生成的不同波浪和海流条件。