POWER DISTRIBUTION SYSTEM

Disclosed is a power distribution system equipped with: a DC electric power system for supplying a DC electric power to a DC load via a DC supply line; an AC power system for supplying an AC electric power from an AC power supply; and a battery which is connected to the DC supply line. The power distribution system is further equipped with: a charging/discharging circuit which charges the battery with electric power from the DC supply line and discharges the electric power from the battery to the DC supply line; a reverse power flow electric power detection circuit which detects the electric power in the reverse power flow to the AC power supply; and a control unit which adjusts the electric power in the reverse power flow to the AC power supply by charging/discharging the battery on the basis of the detection results of the reverse power flow electric power detection circuit.