Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Optimal design of control loop parameters and impedance spike suppression for 400 Hz two-module series structured inverters

  • Yihan Chen (Collage of Automation Engineering and Artificial Intelligence, Nanjing University of Posts and Telecommunications) ;
  • Honghao Guo (Collage of Automation Engineering and Artificial Intelligence, Nanjing University of Posts and Telecommunications) ;
  • Haixiao Ma (Collage of Automation Engineering and Artificial Intelligence, Nanjing University of Posts and Telecommunications) ;
  • Hui Gao (Collage of Automation Engineering and Artificial Intelligence, Nanjing University of Posts and Telecommunications)
  • Received : 2022.07.28
  • Accepted : 2023.12.02
  • Published : 2024.05.20
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Abstract

The structure of a DC-DC converter connected in series with a 400 Hz inverter is widely used in aviation airborne and ground power systems to provide a medium-frequency AC power supply within a wide input voltage range. To guarantee the dynamic and steady-state performance of a multi-module series converter, it is necessary to individually optimize the control loop and the parameters of each series-connected module. In addition, it is also necessary to consider the input-output impedance matching issues of each converter. In this study, a phase-shifted full-bridge converter employing an average current control strategy is used as the input-side DC-DC converter, and a medium-frequency three-phase four-leg inverter is used as the output-side inverter. The study also conducts a small-signal modeling analysis to reveal the intrinsic relationship between the closed-loop output impedance of the input-side converter and the circuit parameters. It summarizes the optimization criteria for controlling the parameters of the voltage and current loops. By suppressing the peaks of the output impedance of the input-side converter, the impedance matching between the input- and output-side converters is ensured over the entire frequency range, ensuring the stable operation of the overall system. Finally, the correctness of the theoretical analysis is verified through simulation and experimentation.

Keywords

Acknowledgement

This study was supported by Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars to Yihan Chen with Grant number BK20160894.

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