基于线性自抗扰模型预测的LLC谐振变换器控制策略

李梦雨; 高文根

文章摘要

基于线性自抗扰模型预测的LLC谐振变换器控制策略

Control Strategy for LLC Resonant Converters Based on Linear Active Disturbance Rejection and Model Predictive Control

投稿时间：2026-02-24 修订日期：2026-03-16

DOI：

中文关键词: 全桥LLC谐振变换器扩展描述函数法线性自抗扰控制模型预测控制

英文关键词: Full-bridge LLC resonant converter Extended describing function Linear active disturbance rejection control Model predictive control

基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）

作者	单位	邮编
李梦雨	安徽工程大学	241000
高文根^*	安徽工程大学	241000

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中文摘要:

为了提高全桥LLC谐振变换器在负载或输入电压突变等复杂工况下的动态响应速度和鲁棒性，提出了一种基于线性自抗扰控制电压外环与模型预测控制电流内环的双闭环控制策略。首先，通过扩展描述函数法对全桥LLC谐振变换器进行小信号建模。其次，将LADRC应用在变换器的电压外环，通过线性扩张状态观测器对系统的总扰动进行实时估计和补偿，以实现输出电压的无静差跟踪；电流内环则采用MPC，直接对谐振电流进行轨迹跟踪。最后，通过MATLAB/Simulink依次搭建了LADRC-MPC、双PI以及LADRC-PI三种控制策略的完整系统仿真模型，并进行对比分析。仿真结果表明：所提出的控制策略在系统启动阶段相比另外两种控制策略输出电压的超调量分别降低了80.5%和28.3%，同时也能够降低负载突变以及输入电压跳变工况下输出电压和电流的超调量，提高系统的动态响应速度。

英文摘要:

To enhance the dynamic response speed and robustness of the full-bridge LLC resonant converter under complex operating conditions such as load variations or input voltage fluctuations, a dual closed-loop control strategy combining Linear Active Disturbance Rejection Control in the voltage outer loop and Model Predictive Control in the current inner loop is proposed. First, the extended describing function method is employed to establish a small-signal model of the full-bridge LLC resonant converter. Second, LADRC is applied to the voltage outer loop, utilizing a Linear Extended State Observer to estimate and compensate for the total disturbances in real time, thereby achieving steady-state error-free tracking of the output voltage. Meanwhile, MPC is adopted for the current inner loop to directly track the resonant current trajectory. Finally, complete system simulation models for three control strategies—LADRC-MPC, dual PI, and LADRC-PI—are sequentially constructed using MATLAB/Simulink for comparative analysis. The simulation results demonstrate that the proposed control strategy reduces the output voltage overshoot during the system startup phase by 80.5% and 28.3%, respectively, compared to the other two control strategies. Additionally, it effectively reduces the overshoot of output voltage and current under conditions of load sudden changes and input voltage step variations, thereby improving the dynamic response speed of the system.

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