Frequency coupling impedance modeling and stability analysis of grid-connected converter based on DSOGI-PLL in weak grid

被引：0
|
作者：
Shi J. [1 ]
Yang L. [1 ]
Zhu M. [1 ]
机构：
[1] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2022年 / 42卷 / 05期
关键词：
DSOGI-PLL; Frequency coupling impedance modeling; Nyquist stability criterion; Stability; Weak grid;
D O I：
10.16081/j.epae.202202016
中图分类号：
学科分类号：
摘要：
As a common interface circuit for the medium- and low-voltage DC power distribution system integrated to the grid, three-phase voltage source converter plays an important role in system operation. To solve the instability problem of the grid-connected converter with the DSOGI-PLL(Double Second Order Generalized Integrator-Phase Locked Loop) in weak grid, the frequency coupling impedance model of DSOGI-PLL is firstly established, and then the frequency coupling impedance model of the grid-connected converter considering a variety of frequency coupling factors is built. Based on this model, the effects of DSOGI-PLL parameters, DC voltage loop bandwidth and current inner loop bandwidth ratio on the frequency coupling characteristics of grid-connected converter are analyzed. Then, the equivalent single-input single-output Nyquist stability criterion considering the frequency coupling characteristics is derived, and the influence of various factors on the stability of the grid-connected converter system is studied. Finally, based on the MATLAB/Simulink, the frequency coupling impedance model and system stability are simulated and verified, which proves the accuracy of the proposed frequency coupling impedance model and the theoretical analysis. © 2022, Electric Power Automation Equipment Press. All right reserved.
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页码：112 / 117
页数：5
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