Assessing the dynamic behavior of multiconnected offshore floating photovoltaic systems under combined wave-wind loads: A comprehensive numerical analysis

Abstract

Floating photovoltaic (FPV) systems have garnered considerable interest due to their numerous benefits. However, the mechanical design of these systems remains underexplored in existing literatures, necessitating further investigation before they can be commercially deployed in ocean environments. In this study, a novel modular offshore FPV solution was proposed, and numerical modeling and hydrodynamic coupling analysis of multi-body FPV systems were conducted to assess the relative behavior of multi-connected FPV modules under combined wave-wind conditions. Initially, the multi-connected system was modeled, taking into account fixed and hinged connection boundary conditions (BC). Utilizing frequency-domain analysis, the hydrodynamic coefficients essential for time-domain analysis were derived. Subsequently, the overall hydrodynamic performance and behavioral characteristics of various FPV platform types were evaluated. In addition, the strength of connectors under extreme conditions were assessed. Lastly, we compared the motion responses of the multi-body platform under different connection BCs and wave headings. It has been proven that the joint of the hinged connector will generate additional moments, which will affect the dynamic response of the platform as an excitation load. Moreover, the connector's structural responses were mainly dominated by the motion response of the FPV platforms. Furthermore, for the multi-body FPV systems, 0° wave heading should be avoided for installation to reduce the motion responses and structural responses. This study provides valuable insights into the mechanical design of FPV systems for ocean deployment.