In recent years

the synchronization stability issues caused by high-penetration of power electronic converters have received extensive attention from both academia and industry. Current research focuses on the impact of the phase-locked loop on synchronization stability

but pays little attention to the impact of control nonlinearities

such as limiting

saturation

and dead zone on synchronization instability. This paper investigates the impact of two typical control nonlinearities

namely the hard limiter and circular limiter

on the large-signal synchronization stability of grid-tied converters. First

the isomorphism and heteromorphism of synchronization equations with different kinds of limiters are analyzed. Then

the system's analytical oscillating solutions and large-signal stability boundaries are proposed based on the method of averaging. Finally

the impacts on the synchronization stability from various factors including operating conditions

control parameters

and limiter parameters

are quantitatively revealed via the proposed stability boundaries.