Abstract: Addressing the issues of frequency fluctuations, power oscillations, and even instability that are prone to occur during the dynamic operation of Virtual Synchronous Generators (VSGs), this paper proposes an improved VSG control scheme. By incorporating a differential compensation link into the active-frequency controller, the system damping level is enhanced, effectively suppressing power overshoot phenomena. Simultaneously, a virtual impedance is introduced between the VSG output terminal and the grid, enabling the VSG output voltage to align with the grid voltage in terms of frequency, amplitude, and phase through closed-loop regulation. This ensures a smooth transition from off-grid to grid-connected operation and accelerates the synchronization process. An improved VSG off-grid and grid-connected simulation model is constructed using MATLAB/Simulink, and the results validate the correctness and practicality of the proposed control method.