On the Reduction of Roll Motion and the Optimization for the Floating Unit of a Floating Wind Power Plant

为实现海上大型风电场，正在开发AF型浮动式风力机平台概念，该风电场由许多箱梁式浮式机组组成。浮式机组安装两台5000kW风力机，浮式机组系泊系统采用聚酯系缆和垂直载荷锚杆，减小浮式机组在横浪中的横摇运动，对减小风力机转动惯量，不降低发电效率具有重要意义。本项目提出了几种安装在浮式机组船体横梁下的水平减摇鳍，在不增加对系泊系统影响的情况下，减小横摇运动。如波浪激振力矩或波浪漂移力矩，通过模型试验研究减摇鳍的减摇效果及其对系泊系统的影响。在静水中进行强迫振动试验，得到附加的惯性力矩和阻尼力矩。并在规则波中进行了波浪载荷试验，得到了波浪激振力矩和波浪漂移力矩。试验结果表明，在船体梁下较深处安装大面积减摇鳍后，减摇效果较好，而波浪荷载没有明显增加。在此基础上，对系泊系统进行了分析，结果表明，带水平减摇鳍的浮体单元在技术上可以在外海系泊。

Af loating wind turbine platform concept is being developed for realization a large-scale wind power plant at open sea This wind power plant is comprised of a lot of box-girder type floating units. The floating unit mounts two 5, 000kW wind turbines, and polyester mooring ropes and vertical loading anchors are applied in the mooring system of the floating unit It is significant to reduce the roll motion of the floating unit in beam seas for decreasing of the inertia moment of a wind turbine and not lowering the generation efficiency.In this project, several types of horizontal fin stabilizers installed under hull girders of the floating unit were proposed, to reduce the roll motion without increasing of influences on a mooring system, such as the wave exciting moment or the wave drift moment And the effect of the fin stabilizers on the motion reduction and the influences on the mooring system were investigated by model tests.Forced oscillation tests in still waters were performed and added inertia moments and damping moments were obtained. And wave loads tests in regular waves were made to obtain the wave exciting moments and the wave drift moments. As a result of these tests, it was confirmed that a high effect on motion reduction is obtained without noticeable increasing of the wave loads in case large-area fin stabilizprs are installed deeply under hull girders. Furthermore analysis of a mooring system was made, with the result that the floating unit with the horizontal fin stabilfrers can be moored technically at open sea.