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Synchronization Stability Analysis Under Ultra-Weak Grid Considering Reactive Current Dynamics
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DOI：10.1109/TIE.2024.3370947.png)
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Abstract
En 中文
The synchronization stability of grid-following converter has attracted extensive attention. It has been reported that the transient synchronization behavior during a grid fault is dominated by the phase-locked loop (PLL), while the current loop is always approximated as a unity gain. Nevertheless, this letter notices that the reactive current dynamics will also influence the synchronization stability under ultra-weak grid, which increases the risk of losing synchronization, and causes the PLL output frequency to be outside the limitation. Accordingly, a refined fourth-order model is proposed to reveal the above underlying mechanism and quantify this coupling effect.
Keywords:
Phase locked loops
Synchronization
Circuit faults
Power system stability
Transient analysis
Circuit stability
Stability criteria
Current dynamics
grid-following converter (GFC)
phase-locked loop (PLL)
synchronization stability
ultra-weak grid
Journal
IF:
7.2
Papers:
1.8W
Citations:
9.8W