A Simple but Effective Virtual Inertia Control for Dual Active Bridge in DC Microgrid to Suppress Voltage Fluctuation

Virtual inertia technology can suppress the voltage fluctuation of a DC microgrid, but the existing virtual inertia strategies are mostly based on differentiation elements, which may risk the system stability and noise-rejection capacity. In this paper, a simple but effective virtual inertia control algorithm without differentiation element is proposed for dual active bridge (DAB) to suppress the voltage fluctuation in a DC microgrid. The impedance model of the DAB with the proposed method is built through small-signal analysis, and the effectiveness of the proposed method is validated with simulation.