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<p>The dual-buck inverter has been attracting increasing attention due to its advantages in terms of grid-connected power quality and efficiency. Since grid-connected inverters must possess reactive power regulation capabilities, this paper proposes a modulation strategy for a single-phase dual-buck inverter in the <i>dq</i> rotating reference frame. This strategy enables operation in the reactive power regulation mode. The grid current of dual-buck inverters tends to distort near the zero-crossing of the grid voltage. This paper provides a detailed analysis of the causes of this distortion and proposes constraint conditions to avoid it. Improvements are introduced in both the topology and modulation strategy of the dual-buck inverter, effectively resolving the issue of grid current distortion. Finally, a DC 60&#xa0;V, AC 36&#xa0;V, and 300 W dual-buck inverter experimental prototype is constructed. Experimental results validate the feasibility of the reactive power regulation mode and confirm the effectiveness of the proposed solution for mitigating current distortion.</p>

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Reactive power regulation and current distortion suppression in dual buck grid-connected inverters

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Jianwei Ren,
  • Peng Wu,
  • Zhong Shao,
  • Wei Lu,
  • Huachun Gu,
  • Peng Zhang

摘要

The dual-buck inverter has been attracting increasing attention due to its advantages in terms of grid-connected power quality and efficiency. Since grid-connected inverters must possess reactive power regulation capabilities, this paper proposes a modulation strategy for a single-phase dual-buck inverter in the dq rotating reference frame. This strategy enables operation in the reactive power regulation mode. The grid current of dual-buck inverters tends to distort near the zero-crossing of the grid voltage. This paper provides a detailed analysis of the causes of this distortion and proposes constraint conditions to avoid it. Improvements are introduced in both the topology and modulation strategy of the dual-buck inverter, effectively resolving the issue of grid current distortion. Finally, a DC 60 V, AC 36 V, and 300 W dual-buck inverter experimental prototype is constructed. Experimental results validate the feasibility of the reactive power regulation mode and confirm the effectiveness of the proposed solution for mitigating current distortion.