Abstract: A large number of renewable energy power generation devices are connected to the DC microgrid by power electronic converters, which makes the system show the characteristics of low inertia and weak damping. Factors such as load switching on the DC bus can easily induce disturbances and oscillations of bus voltage. To solve the above problems, small signal impedance modeling is carried out for each part of the photovoltaic storage DC microgrid, and the stability of the system under different load power is analyzed. A method for suppressing oscillations by adding damping correctors to the voltage and current loops of the energy storage converter is proposed, and the dynamic response of the system is improved by introducing high-frequency components feedforward of the energy storage converter output current. The bus voltage oscillation is suppressed by correcting the negative resistance region of the output impedance of the energy storage converter, while bus voltage fluctuations are reduced when the system load power changes, thereby improving power supply quality. Compared with the oscillation suppression method of inserting virtual impedance in series with the droop control link, the method proposed can better improve the system stability margin. Finally, the effectiveness of the method proposed is verified through simulation.