A New Phase-locked Loop Design Method and Stability Analysis Considering the Coupling Effect of Grid-connected Inverter Under Weak Grid

被引：0
|
作者：
Ge, Haoyu [1 ]
Yang, Ming [1 ]
Fang, Cong [1 ]
Zhu, Jun [1 ]
机构：
[1] Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Henan Polytechnic University, Henan Province, Jiaozuo
来源：
Dianwang Jishu/Power System Technology | 2024年 / 48卷 / 12期
基金：
中国国家自然科学基金;
关键词：
grid-connected inverter; new phase-locked loop; parameter design; robustness; weak grid;
D O I：
10.13335/j.1000-3673.pst.2023.2154
中图分类号：
学科分类号：
摘要：
In response to the issue of mutual coupling leading to system instability among the current loop, phase-locked loop, and grid impedance of the grid-connected inverter under a weak grid, a mathematical model for the grid-connected inverter under weak grid conditions is established. The coupling principles between the phase-locked loop and the current loop are analyzed. Based on zero-pole distribution and the Nyquist stability criterion, the primary reasons for the decrease in system robustness when the grid impedance and the bandwidth of the phase-locked loop change are revealed. A new phase-locked loop control structure is proposed by constructing a pre-link to reshape the phase-locked loop transfer function and providing a specific parameter design method. Theoretical analysis indicates that the proposed new phase-locked loop can eliminate the impact of phase-locked loop bandwidth on system robustness, decoupling of phase-locked loop bandwidth and current loop, and enhance the system's adaptability to weak grids. Finally, simulations and experiments are conducted to verify the effectiveness of the proposed new phase-locked loop design method. © 2024 Power System Technology Press. All rights reserved.
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收藏
页码：5108 / 5117
页数：9
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