基于磁路耦合的电力电子变压器直流变换技术

针对模块串联型电力电子变压器中变压器数量多、绝缘要求高的问题,设计了一种基于磁路耦合变压器的多有源桥直流变换器结构,能够提高模块化程度和减少高频变压器端口数目,提升系统功率密度.该变换器采用多磁芯高频变压器,变压器原边具有多绕组结构,对应多模块的串联,以满足输入高电压等级的要求;副边则采用单一绕组,对应全桥或多个全桥电...

Improved DC Converter Based on Magnetic Coupling for Power Electronic Transformer

To overcome the volume drawback of the transformer in series connected power electronic transformer, a multiple active bridge converter with an improved transformer is designed in this paper. The series connection of H-bridges is applied in the primary side of transformer to bear high voltage, while single or parallel connection H-bridges can sever as secondary topology to support high current level. A novel high-frequency transformer structure is illustrated which use multi-winder in primary side and single winder in secondary side. The designed transformer structure can integrate the cores and primary winders in the high side converter modules and decrease the number of ports of secondary side. At the same time, the equivalent model and control principles are discussed. Finally, the feasibility of the converter and control strategy is verified by the experimental prototype results