海上风机半潜式基础概念设计与水动力性能分析

Conceptual design and hydrodynamic performance of the semi-submersible floating foundation for wind turbines

针对5 MW海上风机动力响应较大的问题,提出了半潜型浮式基础的概念设计,研究了半潜式浮式基础在不同风浪环境下的运动响应和生存能力。考虑叶片空气动力载荷及风浪载荷,以及浮式基础与系泊系统的耦合,建立风机结构系统及水动力模型,采用动量-叶素理论计算叶片空气动力载荷,在频域范围内计算了载荷传递函数。计算分析浮式基础风机系统不同风浪情况下的时域动力响应,评估了半潜型浮式基础在极限海况下的生存能力。结果显示,半潜型浮式基础运动性能良好,且在极端海况下,各系泊缆安全系数均大于1.67,破损状况下安全系数均大于1.33,该浮式基础及其系泊系统具有足够的抵抗极端海况的能力。

The semi-submersible floating foundation was conceptually designed to support a generic 5 MW wind turbine that has a large response to hydrodynamics. The motion responses and survivability of the floating foundation were analyzed under different wind and wave environments. The structure system of wind turbine and the hydrodynamic model were established using loads of blade aerodynamics, loads of wind and wave, and coupled floating foundation and mooring system. The blade aerodynamic load was obtained by the blade element momentum theory and the load transfer function was calculated in the frequency domain. The dynamic responses in the time domain was calculated under different wind and wave circumstances for the wind turbine of the floating foundation. The survivability of the semi-submersible floating foundation under extreme sea conditions was assessed. It is shown that the motion performance of the semi-sub- mersible floating foundation is good. Furthermore, under extreme sea states the safety factor of each mooring line was seen as being above 1.67. The safety factor of all of the other lines was above 1.33, which included one line broken. It is proven that the floating foundation and its mooring system have enough capacity of resisting extreme sea state.