Analysis And Research Of The Yaw Character Of A Spar-type Floating Wind Turbine

With the worrying of the globe warming, mankind is busy searching clean energy. To quire the abundant wind energy from the deep sea area, floating wind turbine is the best tool. During the working period, turbine will give yaw moment to the whole system because of the unbalance of the aerodynamic loads. For floating wind turbine, balancing the yaw moment is duty of the mooring system. Therefore it is important to design the mooring system with proper yaw stiffness.The study is based on OC3 Hywind, a popular spar-type floating wind turbine. The reason which can influence the yaw moment of the wind turbine is analyzed and then the largest yaw moment in extreme working condition is calculatedTo balance the yaw moment, the original mooring system is changed into an X-type and a Y-type respectively. The performance of these mooring systems is gotten with the help of qusi-static equations. The goal is to increase the yaw stiffness of the mooring system and remain its character on other aspects at the same time. To achieve the goal, an object function is designed and the system is refined in the method of pattern search. At last, the behavior of the refined systems is analyzed and the result is proved to be feasible.