Analysis of Small Disturbance Synchronization Stability of Grid-connected Side of Energy Router Based on VSG

As the core device of the energy internet, the energy router is related to the effective consumption of renewable energy and the safe and reliable operation of the power grid. Therefore, the energy router based on virtual synchronous generator (VSG) grid-connected control technology is gradually being applied. This technology provides virtual inertia and active support capability for the energy router by simulating the rotor equations of motion of synchronous generators. However, it may also cause low-frequency oscillation and endanger the safe operation of the power grid. To address this issue, the small-signal state-space equations of the energy router grid-connected VSG system are established in this paper. The mechanism of the main participating factors in the low-frequency oscillation modes of the system is analyzed, and measures to enhance the small disturbance synchronous stability of the energy router grid-connected VSG system are proposed.