电力电子变压器能量双向流动研究

Research on bidirectional energy flow for power electronic transformer

介绍了双直流环结构电力电子变压器的拓扑和工作原理,对其各级子电路提出了相应的控制方案;分析了电力电子变压器的能量双向流动,并进行了仿真。仿真结果表明:电力系统中,双直流环结构电力电子变压器可以实现网侧电流灵活控制、电网接近单位功率因数运行,有较好的负载输出电压,还能实现能量双向流动。

The dual DC link topology of power electronic transformer＇s operation principle was introduced. Each sub-circuit＇s control strategy was provided. The bidirectional energy flowing was analyzed, and the system simulation was completed. The results of the simulation show the good performances of the power electronic transformer, which is applied in the power system. In the power source side, input current can be flexibly controlled and operated with a close unit power factor. The output voltage in load side is good. And the bidirectional energy flowing can be realized.