高电压技术2025，Vol.51Issue(2)：816-827,12.DOI:10.13336/j.1003-6520.hve.20240849
两级式AC-DC变换器母线电压纹波前馈控制方法
Bus Voltage Ripple Feedforward Control Method of Two-stage AC-DC Converters
摘要
Abstract
The two-stage AC-DC converter exhibits an inherent characteristic of instantaneous power fluctuation in the power factor correction(PFC)of the front stage,resulting in a double-frequency ripple in the bus voltage that adversely affects the output voltage quality of the rear CLLLC resonant converter.In order to address these challenges,a feedfor-ward control method based on second-order generalized integral(SOGI)is proposed for variable gain bus voltage ripple compensation.SOGI is utilized to extract information regarding bus voltage ripple.By analyzing the relationship between quality factor Q and voltage gain as well as considering how bus voltage ripple impacts normalized frequency,we inves-tigate its influence mechanism on output voltage of CLLLC resonant converter and derive a relationship between Q value and feedforward gain coefficient Ka.Through simulation optimization and data fitting,we obtain a curve representing the feedforward variable gain coefficient.Simulation and experimental results demonstrate that,compared to non-feedforward control methods,our proposed approach achieves superior suppression effect on output voltage ripple of CLLLC resonant converters with a reduction rate up to 72%,thus validating its effectiveness.关键词
两级式AC-DC变换器/CLLLC/可变增益前馈控制/纹波抑制/SOGIKey words
two stage AC-DC converter/CLLLC/variable gain feedforward control/ripple suppression/SOGI引用本文复制引用
贺虎成,李凯凯,王承海,翟恒,王嘉若..两级式AC-DC变换器母线电压纹波前馈控制方法[J].高电压技术,2025,51(2):816-827,12.基金项目
西安科技大学学位与研究生教育教学改革与研究项目(YJG202412).Project supported by Degree and Postgraduate Education Reform and Re-search Project of XUST(YJG202412). （YJG202412）
