考虑限流的双 PSL 并联系统的切换机理及稳定性分析

In the transient stability analysis，the grid-forming converter considering current limiting will appear as a switching system，and its switching mechanism is still unclear. Aiming at a dual power synchronization loop（PSL） system considering current limiting，where the current limiting measure uses a current saturation algorithm. The switching boundaries of the dual-machine system in terms of phase angle are derived. It is found that the dual-machine system considering current limiting has four working states and four switching boundaries within a phase angle period，and the positions of two switching boundaries are related to the saturation current angle settings of the two converters. Based on this，the transient stability of the studied system is further analyzed，obtaining the stable equilibrium points of the four working states. The stable equilibrium points are configured by changing the current saturation angle set values of the two converters，which can avoid the situation that one converter is locked in the current limiting control mode. The simula⁃ tion verifies the correctness and effectiveness of the proposed theory.