Impedance Modeling and Stability Analysis of Grid-connected Inverter Under Unbalanced Grid

被引：0

作者：

Xie B. ^{[1
]}

Li P. ^{[1
]}

Su J. ^{[1
]}

Zheng W. ^{[1
]}

Shi Y. ^{[1
]}

Liu T. ^{[2
]}

机构：

[1] Research Center for Photovoltaic Systems Engineering of Ministry of Education, School of Electrical and Automatic Engineering, Hefei University of Technology, Hefei

[2] State Grid Anhui Ultra High Voltage Company, Hefei

来源：

Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 12期

关键词：

DSOGI-PLL; grid-connected inverter; impedance modeling; StarSim; unbalanced grid;

D O I：

10.13336/j.1003-6520.hve.20230410

中图分类号：

学科分类号：

摘要：

In order to analyze the system stability of grid-connected inverter under unbalanced grid, this paper first establishes an output sequence impedance model of grid-connected inverter based on the traditional synchronous reference frame phase locked loop (SRF-PLL). It is found that the negative sequence fundamental frequency voltage of the grid has a negligible influence on the output impedance of the inverter, while the unbalanced three-phase grid impedance will seriously affect the stability of the system. Then, in order to improve the stability of the system under unbalanced grid, a small signal model of dual second order generalized integrator phase locked loop (DSOGI-PLL) is established, and the output sequence impedance model of inverter based on DSOGI-PLL is derived. It is found that DSOGI-PLL can significantaly improve the system stability under the condition of grid voltage imbalance and impedance imbalance. Finally, the corresponding simulation and experimental verification are carried out, and the theory in this paper is confirmed experimentally. © 2023 Science Press. All rights reserved.

引用

页码：5196 / 5207

页数：11

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