Response analysis of floating wind turbine with counterweight mooring under extreme sea conditions,极端海况下附配重系泊漂浮式风力机响应分析

In order to improve the platform stability and reduce the risk of anchor lifting, the method of adding counterweight on mooring system is proposed. Based on radiation/diffraction theory and finite element method, the dynamic response of Barge platform, the mooring force and variation of the lying length before and after adding counterweight are compared, and the influence of counterweight position is studied. The results show that, on the premise of ensuring mooring safety, adding counterweight can effectively reduce the platform's surge, heave and pitch response while the lying length of mooring is increased. When the counterweight is about 160 meters away from the anchor point, the dynamic response of the platform is smallest while the lying length is largest, and the dynamic response amplitude of surge, heave and pitch response are decreased by 41.9%, 20.4% and 11.8% respectively. In addition, the lying length of No.1-No.4 moorings are 12.9, 2.0, 1.9 and 0.9 times of that without counter weight, the tension increases slightly, but still within the safe range. No.1 mooring's lying length (windward side) is the smallest while the risk of anchor lifting is the highest. No.4 mooring (backwind wave side) shortens the lying length and increases the risk of anchor lifting after adding counterweight.