一种高频链模块化电力电子变压器

摘要

电力电子变压器(PET)包含多级电能变换环节和大量元器件,制约了其效率、功率密度和可靠性的提升.基于模块化多电平矩阵变换器(M3C)的应用,本文提出一种高频链模块化PET电路拓扑.采用矩阵变换的方式可减少电能变换环节,并且所提拓扑可减少高频变压器与子模块的数量,具有体积和重量优势.针对该PET,分析了其工作特性与控制策略设计方法.仿真试验结果表明了所提拓扑及控制方法的可行性.%Power electronic transformer includes a plurality of power conversion links and a large number of components,which limits its efficiency,power density and reliability improvement.Based on the application of modular multilevel matrix converter,a novel PET topology based on modular converter with high-frequency link is proposed in this paper.The energy conversion process can be reduced by using the matrix transformation.What is more,the proposed topology can also reduce the number of high-frequency transformers and sub-modules,with the advantages of volume and weight.According to the PET,the operation characteristics and control strategy design method are analyzed.Simulation results show the feasibility of the proposed topology and control method.