With the continuous development of new energy power generation and smart grid, Power Electronic Transformer (PET) has a good prospect for development because of its remarkable advantages. Based on the topology of AC/DC/AC, the modulation strategy with dual-PWM (Pulse Width Modulation) is adopted to control the operation of power electronic transformers in this paper. The PET structure consists of three units: importation portion, isolation portion and output portion. Model building and analyzing both at the input and output terminals are achieved step by step. And the simulation of the whole PET system with dual-PWM is accomplished with MATLAB/ Simulink. The simulation results show the control system stability and output voltage regulation precision are improved with feed-forward voltage decoupling vector control system. The correctness and effectiveness of the control strategy are demonstrated through the simulation. PETs play an important role in enhancing power supply reliability for Power Grid and promoting the new energy power generation development.

随着新能源发电和智能电网的不断发展，电力电子变压器（PET）以其显着的优势具有良好的发展前景。本文基于AC/DC/AC的拓扑结构，采用双PWM（Pulse Width Modulation）调制策略来控制电力电子变压器的运行。PET结构由三个单元组成：输入部分、隔离部分和输出部分。输入和输出端的模型建立和分析是逐步实现的。整个PET系统的双PWM仿真是通过MATLAB/Simulink完成的。仿真结果表明，前馈电压解耦矢量控制系统提高了控制系统的稳定性和输出稳压精度。通过仿真验证了控制策略的正确性和有效性。PET在提高电网供电可靠性、推动新能源发电发展方面发挥着重要作用。