Abstract
As floating wind turbines develop toward deeper waters, and turbine power capacity continues to increase, the design of dynamic power cables for floating wind turbines faces significant challenges. This study systematically analyzes the response characteristics and configuration optimization of dynamic cables under various underwater configurations, i.e., catenary, lazy wave, lazy S, steep wave and steep S configurations, and under four different water depth conditions, i.e., 50 m, 100 m, 150 m and 200 m, based on a 15MW semi-submersible floating wind turbine platform. Firstly, a fully coupled time-domain numerical model considering mooring system and dynamic power cable is established; then, taking lazy-wave configuration under 100 m water depth as a base model, axial forces and displacement of the cable at various locations along the cable length are comprehensively analyzed under different environmental conditions, revealing the cable dynamic characteristics; Furthermore, under shallow water condition, various cable underwater configurations are investigated, showing problems of the catenary configuration, and indicating the necessity of applying bend stiffeners and bend restrictors; In addition, under medium and deep water conditions, dynamic power cable responses including underwater configurations, key mechanical properties (axial force, bending moment, and curvature) at critical locations along the cable length are comprehensively studied for various configurations, highlighting critical locations that may suffer larger dynamic responses. This work provides a theoretical basis and engineering reference for the design and optimization of dynamic cables for large-capacity floating wind turbines under different environmental conditions.