基于全桥隔离双向变换器的直流变换技术

DC Changing Technologies Based on Dual-Active-Bridge Converter

针对全桥隔离双向变换器移相角调节范围选取问题进行了深入研究。根据同一传输功率下变换器电流应力最小原则,确定了移相角调节范围。针对变换器采用全桥移相控制方式时,产生无功环流的问题进行了定量分析,研究了无功功率的变化规律。基于全桥隔离双向变换器,提出了变开关频率的蓄电池最优充放电管理方案,提高了变换器充放电效率,同时延长了蓄电池使用寿命。最后,搭建了2.5k W实验平台并进行了相关实验,实验结果验证了以上理论分析的正确性。

This paper studied the phase-shift angle selection of dual active bridge （DAB） converter. The adjustable range of the phase-shift angle is classified to ensure the current stress of DAB is minimized in condition of the identical transmission power. The reactive circulating current of the converter with phase-shift control is quantitatively analyzed, and the changing characteristics of the reactive power are researched. The battery charging and discharging management scheme using variable switching frequency DAB is proposed, to improve the efficiency of the converter and prolong the lifetime of battery. At last, a 2.5kW experimental platform is established and the experimental results prove the correctness of the theoretical analysis.