With the rapid development of new energy generation technology, the large-scale grid connection of the new power system with electronic power integration based on virtual synchronous generator (VSG) technology has a significant impact on the system flow, damping and inertia, and also introduces the problem of active power oscillation. According to this, this paper establishes a small signal port characteristic model based on virtual synchronous generator control technology, and analyzes the system stability through the mutual coupling between VSG control parameters. Aiming at the weak damping characteristics of VSG parallel system and the low-frequency oscillation of the main grid, the small signal port characteristic model of multi-VSG parallel system is established, and the stability judgment method of parallel system is proposed. Therefore, the multi-parameter cooperative adaptive control strategy of VSG is designed. Finally, the influence of rotational inertia coefficient and active droop coefficient of the controller on the stability of low low-inertia system under power disturbance is verified by simulation, which makes the grid-connected inverter under the control of virtual synchronous generator have better dynamic response characteristics.