Design method of capacitance value of three-phase cascaded H-bridge power electronic transformer [三相级联H桥型电力电子变压器电容值设计方法]

作者：Wang Z.; Li Y.; Li Z.; Zhao C.; Gao F.; Zhang H.; Wang P.; Zhang C.

来源：Electric Power Automation Equipment, 2020, 40(1): 219-224.

DOI：10.16081/j.epae.202001011

• Cascaded H-bridge
• Instantaneous power fluctuation characteristics
• Method of capacitor design
• Power electronic transformers
• Time domain analytical model

According to the three-phase cascaded H-bridge PET(Power Electronic Transformer), the instantaneous power fluctuation characteristics of its input side are analyzed, and the time domain analytical models of its DC side capacitor voltage and the primary and secondary side current of the intermediate high-frequency transformer are built. Based on the models, a design method of PET capacitor value is proposed. Based on the MATLAB/Simulink, three-phase cascaded H-bridge PET simulation model is built and verified in the power module test platform. Both simulative results and experimental results show that the model can accurately describe the fluctuation characteristic of the capacitor voltage and the high-frequency cur-rent of PET, and provide a research foundation for the design of the circuit parameters and control system.

• 单位
  中国科学院大学