Influence of line impedance on accuracy of reduced-order model for grid-forming converter and sub-synchronous oscillation analysis

被引：0
|
作者：
Sun Q. [1 ]
Wu C. [1 ]
Wang Y. [1 ]
Tian J. [2 ]
Zhan C. [2 ]
机构：
[1] School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai
[2] Nanjing NR Electric Co.，Ltd., Nanjing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2024年 / 44卷 / 06期
关键词：
grid-forming converter; line impedance; participation factor analysis; small-signal model; sub-synchronous oscillation;
D O I：
10.16081/j.epae.202311020
中图分类号：
学科分类号：
摘要：
In most studies on the sub-synchronization oscillation stability of grid-forming converter（GFM），GFM is usually simplified to a three-order model only containing the power outer loop. Although this method is simple，its accuracy will be affected by the characteristics of line impedance. Therefore，it is need to discuss the applicability of reduced-order model for GFM and propose a more accurate reduced-order model. The influence of the variation of characteristics of line impedance on the accuracy of reduced-order model is analyzed，and the results show that the third-order model cannot accurately reflect the variation of system characteristics when the line resistance ratio or short circuit ratio（SCR） changes，and it will make wrong judgment on the system stability. The reason is that the impedance parameters of the line will affect the coupling characteristics of the voltage loop and the power loop，and both control loops will affect the stability of GFM sub-synchronization oscillation. A more accurate reduced-order model including voltage loop is proposed，which can accurately represent the influence of the variation of characteristics of line impedance on system characteristics，and is more suitable for the stability analysis of GFM under complex power grid. The correctness of the theoretical analysis and the effectiveness of the proposed model are verified based on MATLAB/Simulink simulation. © 2024 Electric Power Automation Equipment Press. All rights reserved.
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页码：169 / 175
页数：6
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