Hybrid three-phase rectifier with switched current injection device

A hybrid three-phase rectifier with switched current injection device and high frequency switching current injection network is analyzed in this paper. The rectifier applies suboptimal current injection. Optimization of the injected current amplitude is performed, resulting in the minimum of the input current THD of 4.36%. Ratings of applied semiconductor devices are derived. Effects caused by finite values of the inductance applied in the current injection network are analyzed. It is shown that increased values of the inductance require reduced amplitude of the injected current, and result in slightly increased values of the input current THD. A new structure of the current injection network that provides filtering of the switching ripple is proposed. The results are experimentally verified on a low-power converter model.