全桥LLC谐振变换器的线性自抗扰控制  

Linear Active Disturbance Rejection Control of a Full-Bridge LLC Resonant Converter

作　　者：王晓雷[1] 李郎 郭飞亚 徐博文 WANG Xiao-lei;LI Lang;GUO Fei-ya;XU Bo-wen(School of Electronic Information,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]中原工学院电子信息学院,河南郑州450007

出　　处：《机械工程与自动化》2024年第6期20-23,共4页Mechanical Engineering & Automation

基　　金：中原工学院研究生科研创新计划项目(YKY2023ZK23)。

摘　　要：由于传统PI控制下的全桥LLC谐振变换器的动态性能和抗扰动能力均比较差,设计了一种基于线性自抗扰控制(Linear Active Disturbance Rejection Control,LADRC)的闭环控制器——控制全桥LLC谐振变换器。通过对全桥LLC变换器进行建模得到小信号模型,推导出闭环传递函数,并对其进行了优化处理。采用线性扩张状态观测器对全桥LLC谐振变换器模型自身的不确定性和外部扰动进行跟踪观测补偿,将总扰动的微分扩张为一个新的状态变量,在负载跳变时保证LLC谐振变换器输出电压的稳定。对变换器建立仿真模型,搭建满载功率为100 W、谐振频率为50 kHz硬件实验样机,验证了线性自抗扰控制器的抗扰动能力与有效性。Due to the poor dynamic performance and disturbance immunity of the full-bridge LLC resonant converter under conventional PI control,a closed-loop controller based on linear self-immunity control is designed to control the full-bridge LLC resonant converter.The small signal model is obtained by modeling the full-bridge LLC converter,and the closed-loop transfer function is introduced and optimized.A linear expansion state observer is used to track and observe the uncertainty of the full-bridge LLC resonant converter model itself and the external perturbations to compensate for the differential expansion of the total perturbations into a new state variable,which ensures the stability of the output voltage of the LLC resonant converter during load jumps.A simulation model is established for the converter,and a hardware experimental prototype with a full load power of 100 W and a resonant frequency of 50 kHz is constructed to verify the anti-disturbance capability and effectiveness of the linear self-immunity controller.

关 键 词：LLC谐振变换器 PI LADRC 动态性能 扩展状态观测器 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] TM431[自动化与计算机技术—计算机科学与技术]