Stability Analysis of Grid-connected Inverter Based on Current Positive and Negative Feedback Loop Effects Under Weak Grid

被引：0
|
作者：
Yue J. [1 ]
An R. [1 ]
Gao J. [2 ]
Zhao W. [1 ]
Huang Z. [1 ]
Tao R. [1 ]
Yang Y. [1 ]
Zou K. [2 ]
机构：
[1] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangdong Province, Guangzhou
[2] National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Hunan Province, Changsha
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 06期
关键词：
grid-connected inverter; positive/negative-feedback effects; small-signal model; stability; weak grid;
D O I：
10.13335/j.1000-3673.pst.2022.0692
中图分类号：
学科分类号：
摘要：
The stability problem brought by the DC bus voltage outer loop and the current inner loop control to the grid-connected inverter (GCI) system under a weak grid has been widely studied. However, the differences in the influence of the voltage outer loop and the current inner loop controller parameters on the stability of the GCI have not been intuitively analyzed. For this reason, by constructing a GCI small-signal control block diagram that considers the DC bus voltage dynamics, this paper intuitively reveals the inner mechanism of the effect that the current inner loop controller forms a positive and negative feedback loop in the DC bus voltage control loop through the grid impedance and the phase-locked loop in a weak grid. At the same time, based on the GCI impedance model and the positive and negative feedback loop effects in the control loop, the influence characteristics of the voltage outer loop and the current inner loop controller parameter changes on the stability of the GCI are analyzed. It is pointed out that the stability of the GCI is more sensitive to the changes in the parameters of the current inner loop controller, while the dynamic regulation characteristics are more sensitive to the changes in the parameters of the voltage outer loop controller. Finally, the correctness of the theoretical analysis in this paper is verified by simulation and experiment. © 2023 Power System Technology Press. All rights reserved.
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页码：2423 / 2432
页数：9
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