基于零序谐波电流注入的三相功率因数校正技术研究

提出一种基于零序电流注入的三相高功率因数校正拓扑电路,采用四芯柱三相变压器实现零序电流注入,控制输入电流,使其瞬时跟踪整流输出电压的正半周和负半周波形,在三相无中线的电源系统中实现了装置输入的高功率因数,抑制了电力电子装置的网侧电流谐波。同时,该文分析了电网电压不对称不影响零序电流注入电路,实验结果也表征了这点。最后,通过对实验装置的测试,给出了实验结果,验证了本文提出的高功率因数校正拓扑电路是正确性的。

Research of 3 Phase PFC Technology Based on Injecting Zero Order Current

A novel topological circuit of 3-phase high power factor correction,based on the zero order current injected in the 3-phase power supply system,is presented,which is employing the proposed 4-leg 3-phase transformer to make the zero order current injected and controlling the 3-phase input currents to instantaneously track the rectified positive voltage waveform and the negative waveform respectively.Then in the 3-phase 3-wire power supply system,the unit power factor can be obtained and the input current harmonics from AC side can be restrained.At the same time,this paper analyzes that the input 3-phase asymmetric voltage has hardly an effect on the zero current and the experimental results can indicate that.In the end,results from the experimental investigations on the laboratory prototype venfy the proposed concept.