基于频域分析的DAB变换器优化控制策略

Optimal Control Strategy of DAB Converter Based on Frequency Domain Analysis

为提高双有源桥(DAB)变换器的工作效率,简化DAB变换器的分析过程,此处在频域分析下采用矢量分析方法,提出了一种最小均方根电流的控制策略。相比于时域分析下通过详细的模式分析过程以及复杂的数学优化工具得出的优化控制策略,频域分析方法无需求解开关周期中各时段的状态方程,通过矢量图直观地推导出以电流有效值为优化目标的控制策略。在约束范围内,该策略可以有效降低电流有效值,提高传输效率。最后,通过搭建实验平台,验证了所提优化控制策略的有效性。

In order to improve the working efficiency of dual active bridge(DAB)converter and simplify the analysis process of DAB converter,a control strategy of minimum root mean square current is proposed by using vector analy-sis method under frequency domain analysis.Compared with the optimal control strategy obtained by detailed mode analysis process and complex mathematical optimization tools under time domain analysis,the frequency domain anal-ysis method does not need to solve the state equation of each period in the switching cycle and the control strategy with the effective value of the current as the optimization target is derived intuitively through the vector diagram.With-in the constraint range,this strategy can effectively reduce the effective value of the current and improve the trans-mission efficiency.Finally,the effectiveness of the optimization control strategy proposed is verified by building an ex-perimental platform.