In order to stabilize the power fluctuation in DC microgrid and enhance the dynamic stability of DC bus voltage

we adopted a method for controlling DC bus voltage stability of energy storage converter with DC machine characteristics.In the method

the virtual DC machine（VDCM） link was added to the traditional double closed loop constant voltage control.Moreover

we analyzed the working principle of the control method and the small signal stability.The effect of control method before and after adding VDCM was compared by building a simulation model and a low-power experimental platform for the DC microgrid with photovoltaic and energy storage.Simulation and experimental results show the control method after adding VDCM has the inertia and damping characteristics of a DC machine

which can effectively buffer and suppress the influences of power fluctuation on DC bus voltage

and improve the stability of DC bus voltage.