Abstract
VIENNA rectifier with simple structure, which is widely used in charging systems for electric vehicle, realizes the operation of unit power factor and low harmonic. However, grid voltage unbalance will aggravate the dc-link voltage ripple and input current THD. A novel control scheme is presented to solve the impacts of three unbalanced grid voltage for VIENNA rectifier in this paper. The enhanced phase lock loop (EPLL) not only rapidly separates the positive and negative sequence components from the grid voltage, but also accurately tracks phase angle. Then the dynamic response of proportional resonant (PR) controller guarantees to quickly track the current references with zero-error. Meantime, a simplified carrier-based PWM (CB-PWM) based on the equivalence of SVM is implemented to balance the neutral-point voltage. The validity of the theoretical analysis and feasibility of the proposed control scheme are verified by simulation results.
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