三相三开关部分有源功率因数校正电路的研究

Research on Three-phase Partial Active Power Factor Correction

三相交流电源供电的较大功率变频空调的广泛应用,带来了三相整流器的功率校正问题。根据三相三线制、三相四线制供电方式的不同,提出了两种结合有源PFC技术和无源PFC技术的Buck型混合三相有源部分PFC方案。在对其工作原理进行简要分析的基础上,进行了实验研究,所得结果验证了提出的三相部分PFC具有电压与电流应力小、效率高、功率因数高、直流平均电压较高的特点,各种负载下交流输入侧的各次谐波电流均满足IEC61000-3-2标准,中等负载以上时输入功率因数高达0.98,效率高达0.98。

Higher power inverter-fed air-conditioner is powered by three-phase AC power supply with wide applications,bringing about the issue of the power factor correction（PFC） for three-phase rectifiers.Two three-phase partial active PFC is presented respectively for three-phase three-wire system and three-phase four-wire system,which incorporate active PFC and passive PFC techniques.Based on the description of working principle,the experiments are carried out,and the results prove the features of three-phase partial PFC of low voltage and current stresses,high efficiency,higher power factor and higher DC average voltage.The harmonics current are consistent with IEC61000-3-2 at any load,and the power factor is higher up to 0.98,and the efficiency is above 0.98 at above medium load.