Research on Grid-connected Technology of Microgrid based on VSG

At present, in order to cope with the shortage of traditional energy sources and pollution problems, the development and use of distributed new energy sources is increasing. Aiming at the stochastic drawbacks of distributed energy sources and the limitations that exist when they are operated in parallel with the power grid, this paper designs the system structure of virtual synchronous generator control strategy for microgrids and proposes the pre-synchronous control technology for the grid-connected switching process, so that the microgrids have the inertial characteristics and damping characteristics similar to those of synchronous generators during the operation process. Based on Matlab/Simulink platform, the power system model is built and simulated to verify that the proposed technique can support the smooth operation of the microgrid and the smooth switching of the operation mode.