Abstract: Aiming at the problem of DC bus voltage fluctuation in urban rail trains under traction and braking conditions, the photovoltaic unit is connected to the urban rail power supply system to effectively reduce the DC bus voltage loss. At the same time, a secondary power distribution strategy and a fuzzy droop control strategy are proposed. Firstly, the low-pass filter is used to decompose the train power once. The decomposed low frequency power part is controlled by the battery, and the high frequency power part is controlled by the super capacitor. Secondly, an adaptive secondary power allocation strategy is proposed, which can adaptively adjust the power of the super capacitor and the battery according to the state of charge(SOC) of the battery to achieve a reasonable distribution of power. Then, according to the secondary power distribution and the measured bus voltage value, the fuzzy rules are used to correct the droop control coefficient, and the complete fuzzy droop control(FDC) strategy is obtained. Finally, the above FDC strategy is compared with the fuzzy PID control strategy. The simulation results show that the proposed fuzzy droop control strategy can reduce the DC bus voltage and power fluctuation of the traction network of the urban rail power supply system, and improve the charging and discharging the battery SOC.