浅吃水单柱式浮式风机动力学特性仿真研究

本文采用FAST软件对一种浅吃水单柱式浮式风机系统的动力学特性进行了研究.这一浮式风机适用于能源成本相对合理、水深为150 m的海域.本文首先讨论了这一浮式风机系统和OC3-Hywind系统在动力学特性方面的差异,然后研究了风尤其是湍流风对系统动力学特性的影响,最后对这一系统在多种载荷状况下的动力学行为进行了详尽的分析.研究结果表明:湍流风会在系统固有频率附近引起显著的激励;纵荡和纵摇运动取决于风轮推力,它们通过风轮推力和相对风速之间的联系建立起耦合关系;Spar平台的艏摇运动主要取决于平台横摇时由风轮推力引起的艏摇力矩.

Numerical Simulations on the Dynamic Characteristics of a Shallow-draft Spar-type Floating Wind Turbine

The dynamic characteristics of a shallow-draft spar-type floating wind turbine (FWT) sys-tem are investigated using the numerical code FAST. This FWT system is designed for harvesting wind power in a water depth of 150 m where the cost of energy is believed to be reasonable. A comparison between this FWT system and OC3-Hywind system in terms of their dynamic responses is presented firstly. The influence of wind on the dynamics of FWT system is then investigated. Finally, a compre-hensive load-case analysis is performed for this FWT system. It is found that turbulence brings signifi-cant excitations around the natural frequencies of FWT system. Surge and pitch are dominated by rotor thrust. They are believed to couple with each other through the relationship between rotor thrust and relative wind velocity. And yaw is mainly determined by the yaw moment induced by rotor thrust when the platform is rolling.