Abstract
Transient instability issues of grid-forming voltage source converters (VSCs) considering current limitation strategies are addressed in this paper. Take the virtual synchronous generator (VSG) as the representative grid-forming control, qualitative analysis of transient instability mechanism of the grid-forming VSC is performed firstly. After that, a novel synchronization method named hybrid synchronization control combining the synchronous generator swing equation and the phase-locked loop (PLL) principle is designed, which not only makes the VSC retain its grid-forming characteristics, but also greatly improves its transient stability characteristics. Furthermore, an improved current limiting strategy (ICLS) that can reliably enable and disable current reference limiting loop is proposed, overcoming the drawback that the existing strategy fails to recover from current saturation mode effectively. Finally, simulation and experiments are built to verify the accuracy of the transient stability analysis and the effectiveness of the proposed transient stability improvement scheme.
Published Version
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