Aeroelastic analysis method for wind turbine blade based on large deformation beam model

Large amplitude aeroelastic response problem of wind turbine blade was investigated. Nonlinear Euler beam model, dynamic inflow and dynamic stall model were adopted in aeroelastic modeling. Newton-Raphson iteration was used to solve the nonlinear aeroelastic equations. Newton-downhill method and homotopy continuation algorithm were used respectively to improve convergence, and the result shows that the homotopy continuation is more effective. Two typical wind turbines were analyzed in rated conditions and in extreme wind conditions. The system stability boundary was defined according to the amplitude of blade bending moment, and the relationship between the critical wind speed and azimuth angle of the inflow was researched. The results indicate that the wind turbine blades suffer excessive bending moment in some extreme wind conditions, and the aeroelastic stability boundary of the blade would be reached in some operation mode.