| Abstract |
The aim of this paper is to analyze which reduced order model of the squirrel-cage induction generator
is suitable in the advanced aerodynamic simulation tools used to simulate mechanical loads on wind
turbines. The aero elastic codes focus on the frequency scale 0 –20 Hz, because the main contribution
to fatigue loads is in this frequency range. Three models of induction machine are considered in the
analysis the complete dynamic model, the reduced order model, which neglects the stator transients
and the steady-state model. All these models are analyzed in two cases: a one-mass model and the
two-mass model of the wind turbine drive train. Using linear system theory the eigenvalues and the
frequency response for both approaches are presented. Some simulations regarding the response of the
considered models during start-up, fault condition as well as under a given wind profile, are shown.
Moreover, the harmonic spectra for torque and stator active power are presented. |
