Generally

droop control is used to achieve power distribution in microgrid

but it is easily to produce oscillation under disturbances. Adding a power differential term in droop equations is an effective way to suppress the oscillation. In this paper

microgrid small-signal models of the conventional droop control and the power differential droop control are established. The small-signal analysis is presented to identify the relationship between the controller parameters or the line parameters and the system stability. And the methods for selecting control parameters are summarized. Then

the sensitivity analysis is presented to contrast the degree of participation of state variables in the low-frequency modes. And the association between the line parameters and the participation factors is studied. The conclusion is that the system damping increases with the increase of length or impedance ratio of line. And the dominance of eigenvalue on each inverter source is easy to change. Finally

simulation results in different conditions are used to verify these.