Abstract
In order to get wind energy effectively, the pole-change-type induction generators are used as the wind turbine generators. Otherwise, the pole-change-type induction generator causes the voltage dips at pole changing time. To keep the power quality, it is important to know the state change of the generator operation. Therefore, the authors have studied a state criterion of generator using the tower shadow effect, which is the active power oscillation caused by a rotation torque drop when the tower and the turbine blade overlap each other.In this paper, an improved identification method of oscillation frequency, which is the criterion of wind turbine generator operation, is proposed. A proposed method is applied to measured data and shows that it gives the good results.
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