The load shedding control of offshore floating wind turbine (OFWT) under the action of wind and wave is studied. A three-degree-of-freedom model is established for a wind turbine with a tuned mass damper (TMD). The TMD parameters are optimized based on the stability of the control. In the structural load shedding control, the active control using linear quadratic optimal control algorithm is selected. Active control can calculate the control force by monitoring the movement of the tower in real time. The numerical simulation results show that this method can effectively reduce the dynamic response of OFWT compared with passive control.
In recent years, with the acceleration of global industrialization, the demand for human electricity has increased significantly. However, the use of traditional energy for power generation not only seriously pollutes the environment, but also is limited by the limitation of energy. Therefore, people gradually turn their attention to new energy power generation. As one of renewable energy, wind energy plays an attractive role in new energy power generation.
Traditional wind turbines are built on land, but due to limited land resources and more abundant offshore wind energy resources, offshore wind turbines came into being. According to whether the foundation of offshore wind turbine is fixed or not, it is divided into offshore fixed wind turbines (such as single pile and jacket type) and offshore floating wind turbines (such as barge and tension leg type). Fixed wind turbines are generally installed in shallow water (usually less than 60m). When the water depth exceeds 60m, fixed wind turbines are not economically feasible, and only floating wind turbines can be used (Leng and Yang et al, 2021). Floating wind turbines not only reduce the requirements for water depth, but also provide the possibility to make use of more abundant offshore wind energy resources.
