FANG Zheng,HUANG Yunhui,YAN Wenbo,et al.Stability Mechanism Analysis of Power Synchronization Control for Grid-forming Converters[J].Automation of Electric Power Systems,2024,48(19):101-108.
FANG Zheng,HUANG Yunhui,YAN Wenbo,et al.Stability Mechanism Analysis of Power Synchronization Control for Grid-forming Converters[J].Automation of Electric Power Systems,2024,48(19):101-108. DOI: 10.7500/AEPS20240113001.
Stability Mechanism Analysis of Power Synchronization Control for Grid-forming Converters
Grid-forming converters have the ability to actively construct the grid
which can provide damping and frequency support for the power grid
but there are stability issues in low-impedance power grids. In order to study the stability mechanism of power synchronization control for grid-forming converters with low impedance
firstly
a small-signal model of grid-forming converters connected to the AC power grid that reflects the dynamic characteristics of power synchronization is established. Then
within the framework of Newtonian dynamics
a dynamic model of grid-forming converters connected to the low-impedance power grid is established by taking power synchronization control as the main method and the power offset is decomposed into synchronous and damping components to characterize the stability of the power synchronization control. Subsequently
by combining modal analysis and dynamic characteristic analysis
the influence of power grid strength and control parameters on power synchronization control is analyzed by studying the characteristic root trajectory and participation factor curves
as well as the changes in damping and synchronization components
and their underlying mechanisms are revealed. Finally
the conclusion is verified through a simulation model of grid-forming converters connected to the power grid.
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references
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