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This work proposes a wind generation system connected to a grid using self-excited induction generator (SEIG). The stator currents of the induction generator (IG) are optimally controlled using indirect orientation control (IFOC) according to the generator speed in order to maximize the generated power from the wind turbine. The IG is controlled by the maximum power point tracking (MPPT) below the base speed and the maximum energy can be captured from the wind turbine. The paper presents an IFOC for IG with rotor flux to maintain the DC-link voltage at constant value. During voltage buildup, the variation of the magnetizing inductance is taken into consideration. The DC-link power is transferred to the gird via inverter with vector control. By using the vector controller and the synchronous frame current regulators both the input and output currents of the integrated system are characterized with fast current response and low harmonic distortion. The complete system has been simulated with different wind velocities. The simulation results show the effectiveness of the proposed MPPT wind energy system.
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Orabi et al. (2005) studied this question.
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