Abstract

A three-phase induction machine-based wind power generation scheme is proposed. This scheme uses a low-cost diode bridge rectifier connected to the induction machine via the AC load voltage regulator (AC-LVR) to transfer DC power with voltage regulation. The AC-LVR is used to regulate smoothly the DC load voltage of the diode bridge rectifier circuit connected to the three-phase self-excited induction generator (SEIG). The excitation to the three-phase SEIG is supplied by the static VAr compensator (SVC). This simple method for obtaining a full variable-speed wind turbine system by applying a back-to-back power converter to a wound rotor induction generator is useful for wind power generation with a wide speed variation. The dynamic performance responses and the experimental results of a 5-kW 220-V three-phase SEIG directly connected to a diode bridge rectifier at various loads are presented. Moreover, The steady-state simulated and experimental results of the PI closed-loop feedback voltage regulation scheme prove the practical effectiveness of these simple methods for a wind turbine system.

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