双重有源桥双向DC/DC变换器新型控制方法的研究

Research on Novel Control Strategy for Dual Active Bridge Bi-directional DC/DC Converter

针对双重有源桥双向DC/DC变换器在nU1>U2且处于重载模式下一个周期内的工作状态进行分析,得到高频电感电流的变化规律及电感电流变化与开关管触发信号之间的关系。研究了一种采用变压器漏电感电流作为控制参量的新型移相控制方法,将电压误差放大信号作为变压器漏电感电流信号的给定,并对提出的控制方法进行分析。最后,基于Matlab/Simulink制作了一个仿真模型,验证了新型控制方法的正确性和有效性。

Based on analysis of the working state of the dual active bridge bi-directional DC/DC converter under nUl 〉 U2 and in heavy load mode within a period, the change rule and expressions of the high frequency inductor and relationship between inductor current and switching tube riving signals were obtained. A new phase shift control strategy was researched that uses transformer leakage inductor current as a control parameter, where voltage error amplification signal is made as current given signal followed by a feasibility analysis of this strategy. Finally, the proposed control strategy was simulated with Matlab/Simulink software, and the results illustrate that the performance of the control strategy proposed is correct and effective.