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In this paper, the icing effect on wind turbine is investigated. The sectional aerodynamic performance of iced blade was measured in wind tunnel with icing airfoil models. The analysis conducted by using FAST using the measured sectional performance was conducted to investigate the degradation in wind turbine performance and added load due to icing. Frequency analysis was also conducted with the time series data calculated by using FAST. As the results, the power output at the rated wind speed for the icing case is smaller than that for the clean case and the maximum rotor thrust for the icing case is smaller than the clean case. The wind speed at which the turbine’s rated power is reached for the icing case was higher than that for the clean case.

In this paper, the aerodynamic characteristics is clarified by the airfoil performance test of the model of icing airfoil in wind tunnel. As a results of wind tunnel test, the lift coefficient of model of icing airfoil becomes lower and the drag coefficient becomes higher than those of clean airfoil. With the use of these results, numerical analysis using aeroelastic code was carried out to clarify the influence of icing airfoil on wind turbine performance. As result of the analysis, the rated power with icing airfoil is obtained at higher wind speed than clean one, and the maximum value of output power is decreased by icing airfoil. Compared to clean airfoil, the amplitude of edgewise moment at blade root is increased, which is mainly caused by the effects of mass of icing on the blade.