DIRECT-CURRENT COUPLING SYSTEM AND CHARGING CONTROL METHOD THEREFOR

A direct-current coupling system and a charging control method therefor are provided. In the direct-current coupling system, an alternating-current side of an inverter is configured to connect a power grid, a direct-current side of the inverter is connected to at least one photovoltaic array and at least one energy storage system through a direct-current bus, where the energy storage system includes a battery system and a DC/DC converter connected to the corresponding direct-current bus, so that the DC/DC converter can acquire energy from at least one of the inverter and the photovoltaic array during charging the battery system. The DC/DC converter acquires, in response to a power regulation demand at the alternating-current side, energy from the power grid through the inverter connected to the DC/DC converter during charging the battery system.