Control method and control system of direct-current coupling hydrogen production power supply device and power supply device

The invention discloses a control method and system of a direct-current coupling hydrogen production power supply device and the hydrogen production power supply device, and the control method comprises the steps: starting control after a controlled hydrogen power supply is connected to an external input voltage, taking one of chopping units as a target chopping unit, taking an input capacitor in the target chopping unit as a target capacitor, and taking the input capacitor in the target chopping unit as a target capacitor; acquiring an output voltage proportion state of the target chopping unit, performing closed-loop control on the voltage of the target capacitor according to the acquired output voltage proportion state so as to adjust the voltage of the target capacitor to a target reference value, and acquiring an output current difference reference value according to a closed-loop control result of the voltage of the target capacitor, and performing closed-loop control on the output current of each chopp