The asymmetric or periodically varying blade loads resulted by wind shear become more significant as the blade length is increased to capture more wind power.Additionally,compared with the onshore wind turbines,their offshore counterparts are subjected to additional wave loadings in addition to wind loadings within their lifetime.Therefore,vibration control and fatigue load mitigation are crucial for safe operation of large-scale offshore wind turbines.In view of this,a multi-body model of an offshore bottom-fixed wind turbine including a detailed drivetrain is established in this paper.Then,an individual pitch controller(IPC)is designed using disturbance accommodating control.State feedback is used to add damping in flexible modes of concern,and a state estimator is designed to predict unmeasured signals.Continued,a coupled aero-hydro-servo-elastic model is constructed.Based on this coupled model,the load reduction effect of IPC and the dynamic responses of the drivetrain are investigated.The results showed that the designed IPC can effectively reduce the structural loads of the wind turbine while stabilizing the turbine power out-put.Moreover,it is found that the drivetrain dynamic responses are improved under IPC.

XIE Shuang-yi;ZHANG Kai-fei;HE Jiao;GAO Jian;ZHANG Cheng-lin

College of Mechanical Engineering,Chongqing University of Technology,Chongqing 400044,China;School of Mechanical and Power Engineering,Chongqing University of Science&Technology,Chongqing 401331,China;Beijing Institute of Precision Mechatronics and Controls,Beijing 100076,China;Fishery Machinery and Instrument Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200092,China;College of Engineering Science and Technology,Shanghai Ocean University,Shanghai 201306,China

中国海洋工程（英文版）

[1]XIE Shuang-yi;ZHANG Kai-fei;HE Jiao;GAO Jian;ZHANG Cheng-lin-.Modeling and Analyzing Dynamic Response for An Offshore Bottom-Fixed Wind Turbine with Individual Pitch Control)[J].中国海洋工程（英文版）,2022(03):372-383

drivetrain,unmeasured

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