Charging and Discharging Control Strategy of Energy Storage Converter for Vanadium Redox Flow Battery

The equivalent circuit model of Vanadium redox flow battery was established, the control strategy of energy storage converter for the battery model was studied, and the control parameters were analyzed. In order to ensure the safe charging and discharging of all-vanadium flow battery and improve the charging speed of the battery, this paper proposes a three-closed loop charging and discharging control strategy based on kernel voltage estimation. The three-closed loop adopts SOC loop, voltage loop and current loop. Voltage loop to achieve constant voltage charging; The current loop implements constant current charging. The core voltage of the battery can be predicted and estimated according to its terminal voltage and charging and discharging current. Finally, a simulation model was built on Simulink for verification. The results show that under the control strategy, the charging time is shortened, the stable output of voltage and current is ensured, and the safe charging and discharging of all-vanadium flow battery is realized.