LAI Jidong,CUI Yumei,SU Jianhui,et al.Active Small-signal Stability Assessment Method for Microgrid Based on Hilbert-Huang Transform[J].Automation of Electric Power Systems,2023,47(13):149-158.
LAI Jidong,CUI Yumei,SU Jianhui,et al.Active Small-signal Stability Assessment Method for Microgrid Based on Hilbert-Huang Transform[J].Automation of Electric Power Systems,2023,47(13):149-158. DOI: 10.7500/AEPS20221213001.
Active Small-signal Stability Assessment Method for Microgrid Based on Hilbert-Huang Transform
The characteristic value analysis method based on the system linear model is widely adopted in small-signal stability analysis for microgrid
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 stability assessment method for microgrid
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.
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