数字控制400Hz三相四线高功率因数PWM整流器研究

Digital Controlled 400Hz Three-Phase Four-Wire PWM Rectifier with High Power Factor

根据航空电源系统中AC-DC静止变流器的应用需要,设计了一套数字控制400Hz三相四线高功率因数PWM整流器系统。传统的直接电流控制方法由于被控量是交流信号,因而存在着相位静差问题,本文采用基于dq同步旋转坐标变换的空间矢量控制方法,实现了输入电流与输入电压间的相位无静差控制,实现了高功率因数目的;针对三相四线结构输出串联电容均压问题,本文提出了输出串联电容均压环与中线电流环串联的双闭环控制方法,实现了输出串联电容均压控制。最后在理论分析与仿真的基础上搭建了3kW原理样机,仿真和实验结果均验证了该系统控制方法的正确性与可行性。

In this paper, a digital controlled 400Hz three-phase four-wire PWM rectifier with high power factor is designed for an aeronautical AC-DC converter. Static error exists in direct current control strategy due to sinusoidal reference. So space vector control strategy is used in this paper to realize zero-static-error and high input power factor. In three-phase four-wire topology, the output voltage of the series capacitors may imbalance. So the output voltage balancing outer loop in series with neutral current inner loop control strategy is proposed in this paper to realize voltage balance of series capacitors. At last, both Saber simulation results and experimental results verify the validity and feasibility of the control scheme.