Hybrid and Three-Level Three-Phase Rectifiers Using Interleaved DCM Boost Converters

Abstract

Two new three-phase high-power-factor rectifiers using an interleaved discontinuous conduction mode (DCM) boost converters in a three-level configuration are proposed in this paper. The input currents waveforms follow the input voltages waveforms without a current control loop and the input currents present low current ripple without additional input filter due to the interleaved operation. The main advantage of the proposed rectifiers is the low voltage stress with the voltage applied across all semiconductors and output filter capacitors lower than the output voltage. A high gain rectifier version is presented in a hybrid configuration, including resonant voltage multiplier cell. The structures use only two active switches and current sensors and current control loops are not necessary, becoming a possible solution for low power and low cost applications. The low voltage stress operation and the reduction of the switch current stress due to the interleaved operation allows the reduction of the switches conduction losses of the DCM operation. The experimental results obtained from two prototypes are presented and efficiency equal to 97.26% is obtained for the three-level converter (Vi = 127 V/P = 2 kW) and 94% for the hybrid configuration (Vi = 64 V/P = 1 kW).

Keywords

• Power electronics
• ac-dc power converters
• wind energy generation