A direct current stabilization power supply system, comprising: an electric system including a direct current bus and an electric device connected to the direct current bus; an alternating current power supply and a direct current power supply which supply electric power to the electric system; a charging/discharging control section which is connected to the direct current power supply and the direct current bus and controls charging and discharging amounts of the direct current power supply; and a power conversion section which is connected to the charging/discharging control section, the alternating current power supply, and the direct current bus, and bidirectionally converts alternating current power and direct current power, wherein: a first direct current power supply section is constituted by at least the alternating current power supply and the power conversion section; a second direct current power supply section is constituted by at least the direct current power supply and the charging/discharging control section; wherein the first direct current power supply section and the second direct current power supply section are configured to provide a power supply stabilization operation for supplying the direct current power to the electric system and absorbing regenerative power generated from the electric device; wherein the power supply stabilization operation is shared by at least two paths that are a path of the first direct current power supply section including the alternating current power supply and a path of the second direct current power supply section including the direct current power supply; and characterized in that the power conversion section is configured to control adjustment of an amount of the power supply stabilization operation to be performed by the path of the first direct current power supply section and an amount of the power supply stabilization operation to be performed by the path of the second direct current power supply section, by changing a target value of a voltage of the direct current bus. an electric system including a direct current bus and an electric device connected to the direct current bus; an alternating current power supply and a direct current power supply which supply electric power to the electric system; a charging/discharging control section which is connected to the direct current power supply and the direct current bus and controls charging and discharging amounts of the direct current power supply; and a power conversion section which is connected to the charging/discharging control section, the alternating current power supply, and the direct current bus, and bidirectionally converts alternating current power and direct current power, wherein: a first direct current power supply section is constituted by at least the alternating current power supply and the power conversion section; a second direct current power supply section is constituted by at least the direct current power supply and the charging/discharging control section; wherein the first direct current power supply section and the second direct current power supply section are configured to provide a power supply stabilization operation for supplying the direct current power to the electric system and absorbing regenerative power generated from the electric device; wherein the power supply stabilization operation is shared by at least two paths that are a path of the first direct current power supply section including the alternating current power supply and a path of the second direct current power supply section including the direct current power supply; and characterized in that the power conversion section is configured to control adjustment of an amount of the power supply stabilization operation to be performed by the path of the first direct current power supply section and an amount of the power supply stabilization operation to be performed by the path of the second direct current power supply section, by changing a target value of a voltage of the direct current bus.