A Three-Phase Hybrid Four-Level Rectifier

This paper proposes a three-phase hybrid four-level rectifier. It is a hybrid configuration where each phase consists of a three-level half-bridge circuit and a two-level half-bridge circuit. It provides a new solution to developing a four-level rectifier with small quantity of components and low voltage stresses. A level-shifted carrier modulation scheme and voltage-balance circuit are also introduced. Simulation results have been presented and analyzed to verify the propose topology and modulation scheme.