Abstract
This paper proposes a control scheme for the wide operation range of an induction generator (IG) with a Vienna rectifier. A Vienna rectifier has the limited operation range because the sign of the current should be the same as that of the voltage in the normal operation. For this reason, the power factor of a Vienna rectifier is also limited. In the IG, the d-axis stator current is necessary for the self-excitation of the IG. Usually, the d-axis stator current is controlled to the rated d-axis current, which means that IG can operate in the low power factor. Therefore, the operation range of the IG with a Vienna rectifier is narrow. The proposed control method adjusts the d-axis current appropriately to extend the operation range and to include the operating power factor in the feasible operation range of a Vienna rectifier. The analysis results of the proposed method are verified from PSIM simulations with a 150-kW IG system using a Vienna rectifier.
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