一种带前馈的双闭环APFC控制方法

为了提高传统功率因数校正(PFC)数字控制的稳态性能、动态响应和功率因数,降低输入电流谐波畸变,提出了一种带前馈的双闭环有源功率因数校正(APFC)控制方法.首先,建立了Boost PFC控制系统的小信号模型,推导出了系统传递函数;然后,估算出了Boost拓扑结构主要器件的参数值.通过前馈的作用,系统可以快速响应调整输入电压的变化,利用电压环和电流环实现对输入电流和输出电压的调节.Simulink建模仿真表明:该方法能够在输入电压波动较大的情况下有效地稳定控制输出电压,提高系统的动态响应能力和输入功率因数,减小输入电流谐波畸变.

A double closed loop APFC control with feed-forward

In order to improve the steady state performance,dynamic response and power factor of traditional power factor correction (PFC) digital control method and reduce the harmonic distortion of input current,a double closed loop active power factor correction (APFC) control method with feed-forward is proposed.Firstly,the small signal model of Boost PFC control system is built and the system transfer function is deduced,and then the parameters of the main device with Boost topology is estimated.By means of the feed-forward,the system can quickly respond to the change in input voltage.Furthermore,the use of voltage loop and current loop can achieve input current and output voltage regulation.Simulink modeling shows that this method can effectively control the output voltage in case of input voltage largely fluctuating,improve the system dynamic response ability and input power factor,and reduce the input current harmonic distortion.