Mechanism and Compensation of Zero-Crossing Current Distortion for Three-Phase Vienna Rectifier

The Vienna rectifier is a promising unidirectional topology, however, the current zero-crossing distortion (ZCD) issue increases the THD of phase current and causes a current spike. This paper analyzes the mechanism of the current ZCD from the perspective of current ripple in time domain, and it is revealed that the current ripple in the floating-state vector (FSV) interval near the zero-crossing point is the inherent culprit of ZCD, according to that, the ZCD compensation (ZCDC) method based on the space-vector modulation (SVM) is proposed in this paper. The proposed ZCDC eliminates the FSV interval near the zero-crossing point based on the injection of zero-sequence component. Finally, the proposed ZCDC is verified by simulation and experimental results.