Abstract：The self-startup of a vanadium battery consists of the following steps. Firstly, the electrolyte circulation system is started. After the main switch is closed to connect the cell stack with the converter, the conventional charging and discharging operations are then started. However, the voltage difference can be extremely large between the electrodes in the stack and the required input voltage in the circulation system, especially when the stack is at low capacity. This large voltage difference will lead to a large current transient between the converter and the vanadium battery. Thus, when the converter is using current limit control, the circulation system input voltage should be carefully selected to avoid self-startup failure. This paper presents a two-stage DC/DC converter with a high frequency transformer for the vanadium battery self-startup process with its control principle. A self-startup test with a 5 kW vanadium battery module showed that the converter worked during the self-startup and charge/discharge processes.
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