1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China; 2. Sungrow Power Supply Co. Ltd., Hefei 230088, China

Aiming at the regulation contradictions between output active power steady-state and dynamic characteristics when the conventional virtual synchronous generator(VSG)based on first-order link virtual inertia is connected to the utility grid, a VSG control strategy based on differential compensation virtual inertia is proposed. Through the incorporation of a differential link in the forward channel of conventional VSG control structure, the control strategy accelerates the power response speed, increases the damping of the system, and reduces the power impact on the energy storage unit of VSG during the dynamic process, while ensuring the maintenance of the output active power steady-state control precision. Simulation and experiments have validated the effectiveness of the proposed strategy.