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

作　　者：贺虎成[1] 李凯凯 王承海 翟恒 王嘉若 HE Hucheng;LI Kaikai;WANG Chenghai;ZHAI Heng;WANG Jiaruo(School of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学电气与控制工程学院,西安710054

出　　处：《高电压技术》2025年第2期816-827,共12页High Voltage Engineering

基　　金：西安科技大学学位与研究生教育教学改革与研究项目(YJG202412)。

摘　　要：在两级式AC-DC变换器中,前级功率因数校正(power factor correction,PFC)固有的瞬时功率波动特性会造成母线电压存在二倍频纹波,影响后级CLLLC谐振变换器的输出电压质量。针对以上问题,该文提出了基于二阶广义积分(second order generalized integral,SOGI)的可变增益母线电压纹波前馈控制方法。采用SOGI提取母线电压纹波信息,基于品质因数Q与电压增益的关系和母线电压纹波对归一化频率的影响,解析了母线电压纹波对CLLLC谐振变换器输出电压的影响机理,得到Q值与前馈增益系数Ka的关系,采用仿真寻优加数据拟合的方法得到前馈可变增益系数曲线。仿真和实验结果表明,相比于无前馈控制,所提控制方法对CLLLC谐振变换器的输出电压纹波具有较好的抑制效果,输出电压纹波降低了72%,验证了所提算法的有效性。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 SOGI 

分 类 号：TM46[电气工程—电器]