Abstract
A novel single-phase five-level active rectifier based on the VIENNA-type rectifier with model predictive current control is presented. The proposed topology operates in unidirectional mode, imposing a sinusoidal grid-side current with unitary power factor. A unidirectional electric vehicle battery charger is the target application in which the proposed rectifier is used; however, it can also be used as an active rectifier for other purposes aiming to improve the efficiency of ac-to-dc rectification. The model predictive current control is used to select the active rectifier state during each sampling period, trying to minimize the grid current error and obtain low total harmonic distortion. The suitability and performance of the proposed topology of active rectifier, as well as the principle of operation and the digital control algorithm, are evaluated through simulation and experimental results.
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