Power oscillation is observed when a disturbance occurs in multiple virtual synchronous generators (VSGs) grid, potentially impacting the safe operation of the systems. This chapter presents a distributed adaptive virtual inertia control method for suppressing the power oscillation and improving dynamic frequency response in the multiple VSGs grid. The basic principle of the method is that when the local frequency of a VSG deviates from the average frequency of its neighbors, the adaptive inertia control will exhibit a large inertia and when the local frequency starts to return, a small inertia is shaped to accelerate the convergence to the average frequency. The stability of the presented algorithm is proved by the Lyapunov stability theory, and the guidelines on the key control parameters are provided. Finally, the simulation results and hardware-in-loop results demonstrate the effectiveness of the presented control method.