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Photovoltaic (PV) microinverters have attracted much attention due to their high efficiency, high power density, low cost, and convenience. In this paper, a single-stage single-phase photovoltaic microinverter based on dual active bridge topology and extended phase-shift modulation mode is investigated to optimize the reactive power while satisfying the soft switching of all switching devices on the primary and secondary sides, resulting in further improvement of the overall efficiency. Firstly, the paper considers the effects of dead time and parasitic capacitance to correct the soft switching boundary conditions, and then derives the formulas for the reactive power and improves the modulation strategy to optimize the reactive power. Finally, a simulation model is built to verify the effectiveness of the proposed method.

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Study on Soft Switching Strategy of Single-Stage Photovoltaic Microinverter Based on Reactive Power Optimization

  • 会议论文

  • 发表日期：

    2026年

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  • Jie Wang,
  • Congwei Liu,
  • Zihao Liu

摘要

Photovoltaic (PV) microinverters have attracted much attention due to their high efficiency, high power density, low cost, and convenience. In this paper, a single-stage single-phase photovoltaic microinverter based on dual active bridge topology and extended phase-shift modulation mode is investigated to optimize the reactive power while satisfying the soft switching of all switching devices on the primary and secondary sides, resulting in further improvement of the overall efficiency. Firstly, the paper considers the effects of dead time and parasitic capacitance to correct the soft switching boundary conditions, and then derives the formulas for the reactive power and improves the modulation strategy to optimize the reactive power. Finally, a simulation model is built to verify the effectiveness of the proposed method.