On Transient Stability Analysis of Parallel GFM Converter Systems Considering Current Saturation

Current saturation is one of the key limiting factors of grid-forming (GFM) converters causing transient instability. The interactions among GFM converters further increases the complexity of transient stability analysis when the mode switching between ordinary GFM mode and current saturation mode i...

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Bibliographic Details
Published in2024 IEEE Power & Energy Society General Meeting (PESGM) pp. 1 - 5
Main Authors Sun, Fangyuan, Zeng, Ruiyuan, Diao, Ruisheng, Zhou, Baorong, Zheng, Waisheng, Wang, Ke
Format Conference Proceeding
LanguageEnglish
Published IEEE 21.07.2024
Subjects
Analytical models
Control systems
Grid forming
parallel converter
Power quality
Power system stability
Reactive power
Simulation
Stability analysis
Switches
Transient analysis
transient stability
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Summary:Current saturation is one of the key limiting factors of grid-forming (GFM) converters causing transient instability. The interactions among GFM converters further increases the complexity of transient stability analysis when the mode switching between ordinary GFM mode and current saturation mode is considered. In this paper, the transient stability behavior of the parallel GFM converter system is analyzed. First, a dynamic model of parallel GFM converter system is proposed, considering basic GFM control, current saturation control, mode switching, and interaction between GFM converters. Second, a comparative transient analysis is carried out. With the phase portrait, the current saturation process and the mutual influence between parallel converters are explicitly revealed. Finally, simulation results are provided to verify the theoretical analysis.
ISSN:1944-9933
DOI:10.1109/PESGM51994.2024.10688530