基于重复控制的单相数字PFC变换器

Single-phase Digital PFC Converter Based on Repetitive Control

提出一种应用于倍压Boost功率因数校正(PFC)变换器的复合控制方案,将带有超前相位环节的重复控制器与比例积分(PI)控制相结合。理论分析了PI控制造成输入电流相位超前输入电压的原因,并介绍了复合控制器的设计思路。最后,利用Matlab软件进行仿真研究,并在一台单相4 kW PFC变换器上进行验证。实验表明,复合控制改善了PI控制的稳态特性,减小了输入电流总谐波畸变率(THD),提高了输入电流的功率因数。

A synthesized controller combining proportional integral （PI） controller with repetitive controller for voltage- doubler Boost power factor correction（PFC） converter is investigated.In this control strategy, repetitive controller with phase leading loop is used to compensate the phase shift caused by PI controller.The phase lead effect from the input admittance is analyzed.Mter that,the stability of the repetitive control scheme is evaluated using the error transfer function.The simulation and experimental results show that the steady-state performance of PI controller and the input current total harmonic distortion（THD） are significantly improved by using the proposed control scheme for a 4 kW si- ngle-phase PFC converter.