Scholarlink

<p>The loss of synchronization (LOS) is a main issue of grid-connected inverters during severe grid faults. A frequency-compensation-based phase-locked loop (FC-PLL) structure is proposed to enhance the transient stability of system. In the proposed structure, an additional output frequency feedback loop is incorporated, so that the output frequency of PLL can be compensated in the loop, allowing the grid-connected inverter to establish a new equilibrium point and achieve stable operation, during severe grid faults. Furthermore, the steady-state domain of grid-connected inverters is analyzed, taking the influence of different grid impedance and PI controller parameters into account. Finally, a hardware-in-the-loop experimental platform is established, and the effectiveness of the theoretical analysis in the paper is verified through the experimental results.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Transient stability analysis and improvement of grid-connected inverters during severe grid faults

  • 期刊论文

  • 发表日期：

    2026年2月16日

查看全文
  • Hao Chu,
  • Bao Xie,
  • GuoRong Zhang

摘要

The loss of synchronization (LOS) is a main issue of grid-connected inverters during severe grid faults. A frequency-compensation-based phase-locked loop (FC-PLL) structure is proposed to enhance the transient stability of system. In the proposed structure, an additional output frequency feedback loop is incorporated, so that the output frequency of PLL can be compensated in the loop, allowing the grid-connected inverter to establish a new equilibrium point and achieve stable operation, during severe grid faults. Furthermore, the steady-state domain of grid-connected inverters is analyzed, taking the influence of different grid impedance and PI controller parameters into account. Finally, a hardware-in-the-loop experimental platform is established, and the effectiveness of the theoretical analysis in the paper is verified through the experimental results.