Abstract: A station-building power supply device is provided in each station building and supplies low-voltage AC power to station building facilities of each station building. There are two mode therein: a regenerative mode in which, when regenerative power regenerated by a train to an overhead wire becomes surplus, the surplus regenerative power supplied from the overhead wire and power supplied from a high-voltage distribution line are used together to supply low-voltage AC power corresponding to an amount of normal power consumption of the station building; and a standby power supply mode in which, when a power outage of the high-voltage distribution line occurs, power supplied from the overhead wire is used to supply low-voltage AC power corresponding to an amount of emergency power of the station building.

Abstract: A station-building power supply device is provided in each station building and supplies low-voltage AC power to station building facilities of each station building. There are two mode therein: a regenerative mode in which, when regenerative power regenerated by a train to an overhead wire becomes surplus, the surplus regenerative power supplied from the overhead wire and power supplied from a high-voltage distribution line are used together to supply low-voltage AC power corresponding to an amount of normal power consumption of the station building; and a standby power supply mode in which, when a power outage of the high-voltage distribution line occurs, power supplied from the overhead wire is used to supply low-voltage AC power corresponding to an amount of emergency power of the station building.

Abstract: A charging apparatus includes a power receiving unit that includes a rectifier, receives AC power, and converts the AC power into DC power, a power storage device that has DC power stored therein, a DC/DC converter that can execute a bidirectional power-flow control including a control of charging to the power storage device and a control of discharging from the power storage device using an output of the rectifier, and a control unit that controls operations of the power receiving unit and the DC/DC converter. In the charging apparatus, an output voltage of the rectifier is set different from an output voltage of the DC/DC converter that is applied to an output terminal of the rectifier when the power storage device is discharged.