Fixed Frame Control-Oriented Modeling and Characterization of Asymmetric Wind Disturbances for Advanced Individual Pitch Control Design

Abstract. The development of advanced load reduction strategies is becoming increasingly important for modern wind turbines, making it essential to incorporate both the dynamics and the characteristics of the wind disturbances responsible for structural loading into the control design process. In this context, this work proposes a control-oriented framework that combines the modeling and characterization of asymmetric wind disturbances. Starting from a linearized model with distributed horizontal wind inputs, the inflow is reduced to three equivalent disturbances in a fixed reference frame through a sensitivity-based aggregation of the wind field. The methodology is validated on the IEA 15 MW Reference Wind Turbine, including all relevant aeroelastic degrees of freedom, through turbulent OpenFAST simulations. The results demonstrate accurate reconstruction of open-loop time-domain responses and prediction of closed-loop output spectra, enabling control design to be directly focused on the disturbances to be rejected while reducing the reliance on computationally expensive aeroelastic simulations.