As the results of the characteristics of the components and the control methods used in the DC grid, it presents the characteristics of small inertia. When the load mutates, the voltage also changes violently. In view of this problem, an improved droop control method is proposed in the paper, and the voltage change rate is introduced into the droop coefficient. The charging and discharging actions of the battery is controlled, so that the inertia of the grid further increases on the basis of the original energy storage elements. Some detailed problems in the algorithm are discussed in detail, and a multi-terminal PV-battery-based DC grid is established in MATLAB/Simulink, in which the simulation verification is carried out in. The results show that the algorithm proposed can alleviate the drastic change of voltage caused by load mutation, which is both effective and feasible.
