PI controller gain tuning with FRIT in collective blade pitch control of floating offshore wind turbines

Floating offshore wind turbines have attracted interest in recent years. In floating offshore wind turbines, generator output fluctuation and platform motions are caused by the variation of wind and waves. In this paper, a PI control in collective blade pitch control is used to suppress the fluctuation and motions, and PI controller gains are tuned by the FRIT (Fictitious Reference Iterative Tuning) method. We show that the tuned PI controller improves the disturbance suppression performance.