Control analysis of inverter parallel system based on virtual synchronous generator

The virtual synchronous generator (VSG) is the interface between distribute generator and power grid, which has the inertia and damping characteristics of the synchronous generator. This strategy can effectively control influence of inverters on power grid. In order to reduce the circulating current and power oscillation, this paper proposed a pre-synchronization control strategy which adds the pre-synchronization module and virtual inductive to the controller. In this way, phase angle, amplitude and frequency of the host and slave in parallel system tend to be consistent, so the circulation and power oscillation can be suppressed effectively, and the dynamic performance of the system is enhanced.