考虑潮汐影响下浅水浮式风电结构动力响应研究

以OC4-DeepCWind半潜式风电机组基础和NREL的5 MW风电机组为研究对象,考虑浅水环境条件和潮汐影响,进行浮体水动力分析和系泊布置方案设计,对风电机组-浮体-系泊耦合系统进行整体动力响应分析。研究结果表明,在浅水条件下,浮体水动力特性和系泊回复刚度受水深影响显著,且在水深与结构的吃水比过小时,结构物与海底之间相对流速增大也会对结构物的安全性能产生不利影响,在结构设计阶段需特别考虑。

STUDY ON DYNAMIC RESPONSE OF SHALLOW WATER FLOATING WIND TURBINE CONSIDERING TIDE

Taking the OC4-DeepCWind semi-submersible wind turbine floater and NREL's 5 MW wind turbine as the research target, considering the shallow water environmental conditions and tidal effects, this paper carries out the hydrodynamic analysis of the floater and the design of the mooring layout scheme, as well as the coupled dynamic response analysis of wind turbine-floater-mooring system. The results show that under shallow water conditions, the hydrodynamic characteristics of the floater and mooring restoring stiffness are significantly affected by water depth, and the increase of the relative velocity between the structure and the seabed will also have a serious impact on the safety performance of the structure when the ratio of the water depth and structure draft is too small, which needs to be specially considered in the structural design stage.