The design of a floating wind farm is based on the weather data measured by 1 facility, such as a met tower. The actual weather condition is not uniform in a large-scale wind farm. We analyzed short wave radar data in Japan and correlation of wave data between 2 endpoints in an assumed wind farm, which consists of 25 turbines. The difference of wave height in 1 year data was about 10 %, and numerical simulation was carried out based on the analyzed weather condition. The difference in mooring tension was not large in this study.


Floating Offshore Wind Turbine system would be basically operated in a floating wind farm. In design of a floating wind farm, the latest weather and oceanographic data are necessary. Actual measurement at the installation site is the best solution to acquire the design condition, and measured data at neighboring ports or numerical simulation data are also useful. The installation of a met tower or a floating lidar is necessary to acquire the weather and oceanographic data if measured data at neighboring ports cannot be used since the installation site is far from a shore. In design of a floating wind farm, measured data at 1 measurement facility is used because the installation cost of the measurement facility is high.

In Japan, 3 floating wind turbines and 1 floating substation were installed off Fukushima Prefecture for 3 years (Fukushima Offshore Wind Consortium, 2016) and weather and sea conditions were measured at 1 substation. The scale of wind farms will be larger and larger in the future (IRENA, 2019), therefore, the weather and sea conditions in a large wind farm will not be able to be treated as uniform. The damage risk on floaters and mooring systems will be different under the nonuniform weather and sea condition. Furthermore, that differences will be important to the sampling inspection for mooring system of wind farms which consist of many floaters.

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