基于不确定参数的双重有源桥变换器优化控制

Optimized control for dual active bridge converter based on uncertain parameters

针对双重有源桥变换器控制中的参数不确定性问题,提出了一种优化闭环控制方法。其中,对双重有源桥变换器进行了平均小信号建模,并获得了变换器的多面体模型,利用线性矩阵不等式方法计算出了满足约束条件的反馈参数,并将负载电流反馈引入控制环,得到了优化的混合控制系统结构。仿真结果表明了控制方法能够在参数不确定时保持系统稳定性,并增强了负载阶跃响应。

According to the robustness problem of the dual active bridge converter in closed-loop control, this paper proposes an optimized closed-loop control method. By presenting the average small signal mode on this converter, the polytopic model of the converter can be derived. Then the Linear Matrix Inequality （LMI） method is used to calculate the constrained feedback parameters and the load current feedback is introduced to the control loop in order to get the optimized hybrid structure of the closed-loop control system. Simulation results show the proposed control method shows good stability when parameters are uncertain and enhances the load step response.