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Characteristic analysis of a 2MW wind power system with doubly-fed induction generator (DFIG) is carried out. In the analysis, tower shadow effect that occurs in case of downwind turbine remarkably is considered. Tower shadow effect is modeled as a variation of the output power. Stator-field-oriented vector control is applied to the control system in order to compensate the variation. Furthermore, influence of the moment of inertia against the rotor input in considering of the tower shadow effect is clarified by computer simulation.