Direct current distribution based charging/discharging system for battery formation

A direct current (DC) distribution based charging/discharging system for battery formation, comprising:

• a main power conversion unit configured to convert alternating current (AC) power from an AC power network to DC power having a reference voltage and output the DC power to a DC grid;
• a power system configured to detect the output power of the main power conversion unit;
• a charging/discharging unit including:
• a plurality of charging/discharging units coupled to the DC grid;
• and
• a plurality of batteries in a one-to-one relationship with the plurality of chargers/dischargers;
• and
• a general control unit configured to selectively transmit a first control signal commanding a charge event or a second control signal commanding a discharge event to each charger/discharger based on a formation schedule when the output power of the main power conversion unit is greater than a first threshold power,
• wherein each charger/discharger is configured to:
• convert the DC power of the DC grid to charge power and charge a corresponding battery of the plurality of batteries in response to the first control signal,
• convert discharge power from the corresponding battery to DC power and output the DC power to the DC grid in response to the second control signal, and
• stop charging and discharging the corresponding battery while the first control signal and the second control signal are not received.