Grid-Connected Inverter Control Strategy of DC Microgrid Based on Improved Virtual Inertia Control

To improve the anti-interference ability of DC microgrid bus voltage, a grid-connected inverter control strategy based on improved virtual control is proposed. Firstly, a smallsignal model of the virtual DC motor (VDCM) control of the grid-connected inverter is established, analyzing the influence of virtual inertia parameters on system stability. Secondly, a differential link is introduced into the virtual inertia section of the VDCM for improvement, and the dynamic characteristics of the improved VDCM control are analyzed. Finally, the simulation model is built for validation, and the simulation results show that the proposed improved virtual inertia control can reduce the fluctuations in the DC bus during power transients and ensure the stable operation of the DC microgrid.