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Hybrid modules of Si IGBTs and SiC MOSFETs are integrated into the three-phase grid-tied inverter can enhance the equivalent switching frequency of the hybrid module. However, the impact of the switching frequencies of Si IGBTs and SiC MOSFETs in the hybrid module on the impedance characteristics of the inverter remains unclear. To address this, this paper first establishes an equivalent impedance model considering the electrical coupling between Si IGBT inverter units and SiC MOSFET inverter units. The influence of different switching frequencies on the stability of grid-connected operation of the inverter is analyzed, revealing the relationship between the varying switching frequencies of Si IGBTs and SiC MOSFETs in the hybrid module and the system impedance characteristics. An experimental setup of a three-phase LCL grid-connected inverter is designed to analyze the dynamic stability of the inverter, validating the accuracy of the theoretical research.

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Impedance Modeling and Stability Analysis of Three-Phase Grid-Tied Inverters Based on Hybrid Modules of Si IGBT/SiC MOSFET

  • 会议论文

  • 发表日期：

    2025年

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  • Yian Wang,
  • Zishun Peng,
  • Yuxing Dai,
  • Yao Zhou,
  • Huasen Xie,
  • Shixi Lin,
  • Yongli Yi

摘要

Hybrid modules of Si IGBTs and SiC MOSFETs are integrated into the three-phase grid-tied inverter can enhance the equivalent switching frequency of the hybrid module. However, the impact of the switching frequencies of Si IGBTs and SiC MOSFETs in the hybrid module on the impedance characteristics of the inverter remains unclear. To address this, this paper first establishes an equivalent impedance model considering the electrical coupling between Si IGBT inverter units and SiC MOSFET inverter units. The influence of different switching frequencies on the stability of grid-connected operation of the inverter is analyzed, revealing the relationship between the varying switching frequencies of Si IGBTs and SiC MOSFETs in the hybrid module and the system impedance characteristics. An experimental setup of a three-phase LCL grid-connected inverter is designed to analyze the dynamic stability of the inverter, validating the accuracy of the theoretical research.