Research on Virtual Synchronous Generator Control Strategy Based on the Battery State of Charge

Abstract

The rotational inertia of the power grid is reduced due to the high penetration level of distributed generator (DG) in the system. Virtual synchronous generator (VSG) technology has a prominent advantage as an effective way to solve this problem, but it is still constrained by the energy storage system. Firstly, a virtual synchronous generator control strategy based on battery state of charge (SOC-VSG) according to the actual working conditions is proposed in this paper. The virtual inertia is adjusted according to the state of charge of the battery, and it can avoid over-charging or over-discharging and prolong the service life of the battery. Secondly, the system stable operating boundary conditions and the setting principle of control parameters are proposed in this paper. Finally, a four-terminal network model with battery VSG unit is built, and the validity of the proposed control strategy is verified by the controller-level hardware-in-the-loop experimental test platform