360 / 2017-12-11 10:16:50

Three-Phase Buck Rectifier Based on SiC MOSFETs Used in Power Factor Correction

SVPWM,SiC MOSFET,Cascade Structure,Three-Phase Buck Rectifier,Aircraft Power System

全体主题 > Very high efficiency and compact converters

This paper presents a power factor module based on three-phase buck rectifier cascade with a DC/DC boost converter. The first stage of the structure is three-phase buck rectifier, and the second stage is a boost converter to regulate the first stage output voltage. This two stages cascade structure can fully use the characteristics of three-phase buck rectifier’s ability to limit the current when an output short circuit happened, extend output voltage range and realize unity-power-factor1. A novel three-loop direct current control strategy based on the dq rotating coordinate system is proposed to control the output voltage of the three-phase buck rectifier. In addition, applying SVPWM can improve the utilization rate of the DC current, so that the system can realize higher power level. A 115V/400Hz input voltage, 1.5kW 200V output, PF=0.98, THD of the grid current below 0.15 three-phase buck rectifier prototype based on SiC MOSFET and SiC schottky barrier diode (SBD) has been built up.