高输入功率因数的三相无源AC-DC变换器

Three Phase Passive AC-DC Converter with High Input Power Factor

对于采用三相不控整流桥作为前级的变换器,自然条件下其输入电流波形系数不高,使得输入功率因数很低,降低了电源的利用率。为此需要采用功率因数提高技术,其中无源PFC是一类重要的功率因数校正技术,在某些场合非常具有应用价值。本文介绍了几种三相无源AC-DC变换器的高功率因数方案,如采用LC滤波器、移相电抗器,谐振电抗器,移相变压器,相间变压器,相间电抗器等,在进行简单的工作原理描述后,给出了部分方案的MATLAB/SIMULINK仿真结果。

When the three phase uncontrolled rectifier is employed as the front stage of power converter,the input current waveform factor is low,which leads to lower input power factor and power supply utilization.Therefore,it is necessary to introduce power factor increasing techniques.Passive power factor correction is one of the techniques,which is very useful in some applications.In the paper,several three phase passive AC-DC converters with high input power factor are depicted,such as LC filter,resonant reactor,phase-shifting reactor,phase-shifting transformer,interphase reactor and interphase transformer.After simple analysis,the simulated results by MATLAB/SIMULINK are provided.