Abstract：To address the transient power impact of grid-connected converters during the switching between

grid-following and grid-forming modes，and based on the generation mechanism of this transient power impact，a

virtual synchronous generator（VSG）pre-synchronization control strategy for smooth switching was proposed.

First，the phase difference jump problem during pre-synchronization was corrected，and the tracking direction was

adaptively adjusted according to the phase difference interval，optimizing the phase adjustment amount required for phase tracking. Second，the reference current value was smoothly switched based on the consistency of integrator output to avoid current impact caused by direct switching，and combined with voltage amplitude presynchronization，the transient power impact during the mode switching process was effectively suppressed. Finally，an experimental platform of the grid-connected converter was built and experiments were carried out. The

experimental results verify the effectiveness of the proposed control method in suppressing the transient power

impact during the switching between grid-following and grid-forming modes.

        Key words：grid-connected converter；smooth switching between grid-following and grid-forming modes；

virtual synchronous generator（VSG）；pre-synchronization control

     Format Citation:张国跃，邹阳，王海燕,等. 面向跟/构网平滑切换的VSG预同步控制策略[J].电气传动,2026,56(10):16-22,31. ZHANG Guoyue，ZOU Yang，WANG Haiyan,et al. VSG pre-synchronization control strategy for smooth switching between grid-following and grid-forming modes [J].Electric Drive, 2026,56(10):16-22,31