There is a problem of power oscillation caused by photovoltaic fluctuation in a low voltage direct current system. Thus this paper proposes a voltage feedforward control strategy based on the small disturbance stability analysis method of an RLC impedance network model. This compensates for the DC voltage proportional component in the current loop to reduce the current fluctuation caused by the change in the input side. The power oscillation of the system is suppressed in the condition of strong illumination fluctuation. The results show that the proposed method can effectively reduce the resonant peak and low-frequency impedance amplitude, suppress the power oscillation when the photovoltaic fluctuation is strong, and make it operate stably when the illumination intensity changes greatly. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed method are verified by simulation.

This work is supported by the National Natural Science Foundation of China (No. 52177184).