两级式AD/DC变换器的改进自抗扰控制  

Improved active disturbance rejection control for two-stage AC/DC converters

作　　者：陈俊伟 武鹏[1] 李学举 陈蓓 CHEN Junwei;WU Peng;LI Xueju;CHEN Bei(School of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学电子电气工程学院,上海201620

出　　处：《电力科学与技术学报》2025年第1期230-236,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(62173222)。

摘　　要：为改善两级式AC/DC变换器的动态性能,提升系统的抗干扰能力,提出两级式变换器的改进自抗扰控制(active disturbance rejection control,ADRC)。首先,根据开关周期平均法和扩展描述函数法分别对前级功率因数校正(power factor corrector,PFC)电路和后级LLC(inductor-inductor-capacitor)谐振变换电路进行小信号分析,建立电路的数学模型;随后,将二倍频纹波看作内部扰动,在ADRC的基础上加入扰动抑制律,使观测器快速预估扩张状态,进而分析不同扰动抑制律对系统动态性能和抗扰能力的影响,给出控制器参数设计方法;最后,采用仿真实验测试控制器性能。实验结果表明:相较于传统ADRC和PI(proportional integral)控制器,改进ADRC能在较低的电流谐波下,改善负载突变时输出电压的超调量和调节时间,提升系统的动态性能。To improve the dynamic performance of the two-stage AC/DC converter and enhance the system’s ability to resist disturbances,an improved active disturbance rejection control(ADRC)method for the two-stage converter is proposed.Firstly,small-signal analyses of the pre-stage power factor corrector(PFC)circuit and the post-stage inductor-inductor-capacitor(LLC)resonant converter circuit are carried out based on the switching cycle average method and the extended describing function method,respectively,and a mathematical model of the circuit is established.Then,by considering the double-frequency ripple as an internal disturbance,a disturbance rejection law is incorporated into the ADRC.This allows the observer to quickly predict the extended state and further study the influences of different disturbance rejection laws on the system’s dynamic performance and resistance to disturbances.A method for designing the controller’s parameters is also given.Finally,simulation experiments are conducted to test the performance of the controller.The experimental results show that,compared with the traditional ADRC and proportional integral(PI)controllers,the improved ADRC can improve the overshoot and regulation time of the output voltage when the load is abrupt under lower current harmonics,enhancing the dynamic performance of the system.

关 键 词：两级式AC/DC变换器 自抗扰控制 动态性能 扰动抑制律 功率因数校正电路 LLC谐振变换电路 

分 类 号：TM46[电气工程—电器]