一种新型三相L型双有源桥Buck-Boost变换器

A New Type of Three-phase L-type Dual Active Bridge Buck-Boost Converter

针对宽电压范围输入输出、功率双向传输的场合,提出了一种新型三相L型双有源桥Buck-Boost变换器,它不仅能在输入输出电压匹配时实现功率的正反向流动,还能工作在Buck和Boost模式,且兼具非隔离直流变换器效率高、成本低、体积小的优势,其采用的三相交错式结构降低了输出电流纹波,提升了变换器的功率等级。并针对实际工况下存在的三相电流不平衡问题,提出了基于移相控制的电感电流均衡控制策略,有效抑制了三相电流的不平衡。最后,搭建了一款15kW的变换器样机,变换器实测平均效率达到96.9%,具有一定的应用价值。

For the occasions of wide voltage range input/output and bidirectional power transmission,a new three-phase L-type dual active bridge Buck-Boost converter is proposed,which can not only realize the positive and negative power flow and bidirectional voltage lifting function,but also has the advantages of high efficiency,low cost and small size of the non-isolated DC converter.The three-phase alternating structure reduces the output current ripple and improves the power level of the converter.Secondly,the working principle of the converter topological structure is analyzed,and the inductor current balance control strategy based on phase shift control is proposed in view of the threephase current imbalance in actual working conditions,which can effectively suppress the three-phase current imbalance.Finally,a 15 kW converter prototype is built,and the average measured efficiency of the converter reaches96.9 %,which has certain application value.