Hydrodynamic Performance Of A Novel Stepped Short Spar Floating Wind Turbine For Shallow Water

Offshore wind resources have the advantages of abundant reserves,strong wind power,and good stability.In recent years,the development of deep-water offshore wind energy has become a research hotspot in academia and industry.Among them,the floating wind technology using floating support foundation is considered as the key technology and core equipment for large-scale development of offshore wind energy resources.Large offshore wind turbines using Spar floating support platforms have been commercialized.However,conventional Spar platforms often require a large draft to ensure a sufficiently low center of gravity of system.This limitation limits the deployment of this type of floating platform at medium water depths(less than 100 meters).Therefore,this paper designs and researches a new type of floating wind turbine support platform suitable for China's East China Sea water depth of no more than 100 meters.Based on the commercially successful OC3 Hywind(draft depth of120 meters),a new stepped short draft Spar floating wind turbine platform was designed based on the unique geological and hydrological conditions in the surrounding waters of China by optimizing the topology and system parameters Stepped Short Spar for Shallow water(SJTU-S4).The floating platform has a draught depth of 50 meters and maintains the hydrodynamic stability of the system through a stepped hydrodynamic profile and center of gravity configuration.The hydrodynamic model of the floating platform was established,and the hydrodynamic performance of the platform was evaluated and optimized through an extensive numerical simulation system.A 1:50 scale-down test model was designed and manufactured,and a full model test was performed in the State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University.The results show that the new Stepped Short Spar for Shallow water platform proposed in this paper has good hydrodynamic stability under the 100-meter working water depth and a variety of marine environment incentives,which provides guarantee for the normal service of floating turbines.