With the development of economy and society, the use of a large number of precision instruments and equipment makes the requirements for the safety and reliability of electric energy higher. To solve the power interruption caused by conventional control strategy and drawback of the relay, the virtual synchronous generator (VSG) control strategy is applied for single-phase energy storage converters system. Analysis the active and reactive power control scheme based on virtual torque and virtual excitation and modify the calculation method of single-phase power. Add pre-synchronization to reduce current surge and realize the seamless switching between islanding mode and grid-connected mode under the single-phase VSG control strategy in the energy storage converters . Finally, the simulation of Matlab/Simulink and the experiment of a 1kVA prototype are conducted to verify the correctness and effectiveness of the proposed VSG control strategy for a single-interactive energy storage converters  system. The experimental results show that the proposed VSG control strategy can realize the seamless switching between two operating modes of the energy storage converters  system.

energy storage converters;virtual synchronous generator;seamless switching;pre-synchronization