A Novel Three-Phase Three-Level Power Factor Correction (PFC) Converter Using Two Single-Phase PFC Modules

In recent years, the research on power factor correction (PFC) circuits for high-power applications has increased for the rigorous harmonic limits. Three-level boost type PFC is a very attractive solution for high power density and high efficiency three-phase preregulator. The major advantage of the three level structures is the reduction of the voltage stress on the power switches, which allows the use of low losses and low cost power semiconductors. A common practice for three-phase high-power PFC is the connection of three single-phase modules to the three-phase AC system to achieve the required output power level. Unity power factor is obtained with single-phase modules, but the cost is high because of the large number of components used in the system. In this paper, based on the above considerations, a novel three-phase power-factor correction scheme using only two single-phase PFC modules is proposed and compared with the conventional one in section II. The control strategy is analyzed in section III in detail. The proposed converter has advantages such as fewer components, lower cost, higher component utilization and so on. At last, experimental results are presented to prove the high reliability and efficiency of the converter.