双有源桥DC-DC变换器回流功率优化策略研究

Research on Backflow Power Optimization Strategy forDual-Active-Bridge DC-DC Converter

针对双有源桥DC-DC变换器在功率传输过程中回流功率过大的问题,基于双重移相控制,提出一种分段优化控制策略对回流功率进行优化。通过定义功率分段点,对输出功率进行分段。当输出功率低于功率分段点时,电路实现零回流功率运行;当输出功率高于功率分段点时,电路实现最小回流功率运行。最后,搭建了1台250 W的实验样机。实验结果表明,与传统移相控制方式相比,分段优化控制策略能有效减少双有源桥DC-DC变换器的回流功率,提高电路工作效率。

Aiming at the value of the backflow power of dual-active-bridge DC-DC converter is too large during power transmission,based on the dual-phase-shift control,the segmented optimization control strategy is proposed to optimize the backflow power.In the control strategy,the whole output power is divided by defining the power segmentation point.When the output power is lower than the power segmentation point,zero backflow power operation is realized.When the output power is higher than the power segmentation point,the minimum backflow power operation is realized.Finally,a 250 W experimental prototype is built.The experimental results show that compared with the traditional phase shift control method,the segmented optimization control strategy can effectively reduce the backflow power of the dual-active-bridge DC-DC converter and improve the efficiency of the circuit.