新型无无功环流的双向隔离型DC/DC变换器

Novel Bidirectional Isolated DC/DC Converter Without Reactive Power Circulation

随着双向隔离型DC/DC变换器在新能源、电动汽车及柔性变电站等领域的应用日益增多,变换器拓扑也层出不穷。传统拓扑中存在的无功环流影响着变换器的稳定性及效率,成为目前亟待解决的问题。提出一种新拓扑,其优点是没有无功环流,工作效率高,动态响应快,功率双向流动。首先介绍了所提拓扑的工作原理和控制方法,并根据实际应用提出吸收回路设计方案。最后,将仿真结果与双有源全桥拓扑进行对比,并通过实验结果表明,该拓扑可以实现功率双向流动且不存在无功环流。

With the increasing application of bidirectional isolated DC/DC converters in the field of new energy, electric vehicle and flexible substation, the converter topology is also endless. The reactive circulation in the traditional topologies affects the stability and efficiency of converters, which is a problem to be solved urgently. Aiming at this issue, a new topology was presented in this paper, which has the advantages of no reactive circulation, high efficiency, fast dynamic response, two-way power flow. This paper firstly introduced the working principle and control method of the proposed topology in detail, and put forward the design scheme of absorption circuit according to the practical application.Finally, the simulation results were compared with dual-active-bridge(DAB) topology, and experimental results show that the topology can realize bidirectional power flow and no reactive power circulation.