Development of hybrid model test technique for performance evaluation of a 10 MW class floating offshore wind turbine considering asymmetrical thrust

Abstract

An experimental technique called ‘Real-Time Hybrid Method’ was developed for performance evaluation of a 10 MW class floating offshore wind turbine. To evaluate this experimental technique, six duct fans were attached at the tower top of the 10 MW class floating offshore wind turbine for actuation of Real-Time Hybrid Method. Numerical simulations and model tests were performed to investigate the characteristics of the 10 MW class floating offshore wind turbine. From numerical simulations, it could be found that asymmetrical thrust induced a yaw motion of the platform occurs in the 10 MW class floating offshore wind turbine system; thus, the yaw moment on the nacelle as well as thrust were considered by using the duct fans in the model test. To verify the model test technique, the experimental results were directly compared with the fully coupled analysis results, and the repeatability of the model test technique was investigated by performing repetitive tests. From the experimental results, it could be observed that the model test technique performed well and good repeatability. A transient test was performed for design evaluations, such as normal and emergency stops, faults, etc., using Real-Time Hybrid Method.