Active Small-signal Stability Assessment Method for Microgrid Based on Hilbert-Huang Transform

被引：0
|
作者：
Lai J. [1 ,2 ]
Cui Y. [1 ,2 ]
Su J. [1 ,2 ]
Xu J. [1 ,2 ]
Xu S. [1 ,2 ]
机构：
[1] School of Electrical and Automation Engineering, Hefei University of Technology, Hefei
[2] Research Center for Photovoltaic System Engineering of Ministry of Education, Hefei University of Technology, Hefei
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 13期
关键词：
damping ratio; Hilbert-Huang transform; microgrid; oscillation mode; response curve; small-signal stability;
D O I：
10.7500/AEPS20221213001
中图分类号：
学科分类号：
摘要：
The characteristic value analysis method based on the system linear model is widely adopted in microgrid small-signal stability analysis, which can obtain accurate results when the system model and parameters are known. However, the system topology and parameters of the microgrid with low inertia and weak damping characteristics change dynamically during the real operation process. To solve the problem, this paper proposes an active small-signal microgrid stability assessment method, which does not need to obtain the system structure and accurate parameters. By injecting the current pulse into the system, and collecting and extracting the voltage dynamic response curve, the Hilbert-Huang transform (HHT) is used to identify the parameter of the oscillation mode in the response curve, so that the damping ratio of the system oscillation mode can be obtained to evaluate the small-signal stability of the microgrid. At the same time, to verify the correctness of the proposed method, a small-signal model of the microgrid is established with the known structure and parameters of the microgrid, and the leading characteristic roots of the solution are compared with the identification results of the proposed method. Finally, system simulation and experimental platforms are established based on the MATLAB/Simulink and Starsim HIL, respectively. The simulation and experimental results verify the correctness and effectiveness of the proposed method. © 2023 Automation of Electric Power Systems Press. All rights reserved.
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页码：149 / 158
页数：9
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