Transient Stability Control Strategy for Grid-Connected VSC Systems Under Symmetrical Faults

During grid symmetrical faults, grid-connected voltage-source converters (VSCs) face transient synchronization instability risks during low-voltage ride-through (LVRT). Research on the synchronization stability mechanism and control strategies of grid-connection VSC systems is crucial for maintaining stable operation after severe disturbances. This paper proposes a control strategy to enhance transient synchronization stability based on the equivalent rotor swing equation of VSC. The proposed approach improves both the existence of equilibrium points and the transient synchronization process in grid-connected VSC systems, thereby significantly enhancing their transient synchronization stability during operation. Finally, time-domain simulations confirm the effectiveness of the proposed strategy.