Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Three-mode one-cycle controlled current-source single-stage multi-input high-frequency-link inverter

  • Yanhui Qiu (College of Automation, Qingdao University) ;
  • Daolian Chen (College of Electrical Engineering, Qingdao University)
  • Received : 2022.03.16
  • Accepted : 2022.08.29
  • Published : 2023.01.20
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Abstract

A current-source single-stage multi-input high-frequency-link grid-connected inverter and a three-mode one-cycle control strategy are proposed and deeply investigated in this paper. The inverter contains multiple current-source inverting units, a multi-input high-frequency transformer, and a cycloconverter. It achieves single-stage power conversion and high-frequency galvanic isolation with a simple circuit structure. The control strategy adds a by-pass switch to the energy storage inductor. It has energy-storing, energy-releasing, and three by-pass operation modes in a low frequency cycle. Through calculating the energy-releasing duty cycle in real time, the magnetic saturation problem of current-source inverters is solved and the output waveform quality is greatly improved. Soft-switching of the converter, a transfer function block diagram, and the design of the main circuit parameters are achieved. The simulation of a three-input inverter and experiment on a two-input inverter verify the feasibility and advancement of the proposed circuit topology and control strategy.

Keywords

Acknowledgement

This work was supported in part by the key Project Natural Science Foundation of China under Grant 51537001, and in part by the Mount Tai Scholars' Climbing Plan of Shandong Province, China.

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