基于拓展移相控制的双有源桥全软开关模态的最小回流功率控制

Minimum Return Power Control of DAB Full Soft-Switching Mode Based on Extended Phase-Shift Control

双有源桥(dual active bridge,DAB)作为直流变换器技术的热门应用,得到了越来越多学者的关注。其中,回流功率是其研究热点之一。过大的回流功率会严重影响DAB的运行效率,缩小DAB的软开关范围。针对上述问题,文章基于拓展移相控制,确定了能实现全部开关管软开关的边界条件,有效地降低了开关损耗;另外,提出了一种新型的回流功率优化技术,极大地降低回流功率,甚至可以在某些工况下实现零回流功率,提升DAB的运行效率。针对在线控制,设计了闭环控制系统,通过负载的连续投切仿真,证明了该方法的有效性。最后,搭建了DAB实验平台,通过硬件实验验证了该最小回流功率控制策略的可行性和正确性。

As a popular application of DC converter technology,dual active bridge(DAB)has received more and more attention from scholars.The reflow power is one of the research hotspots.Excessive return power will seriously affect the operating efficiency of the DAB and reduce the soft-switching range of the DAB.In view of the above problems,on the basis of the extended phase-shift control,this paper determines the boundary conditions that can realize the soft switching of all switches,which effectively reduces the switching loss.Even zero return power can be achieved under certain operating conditions,and the operating efficiency of DAB has been improved.For on-line control,a closed-loop control system is designed,and the effectiveness of the method is proved by the continuous switching simulation of the load.Finally,the DAB experimental platform is built,and the correctness of the theory is verified by hardware.