Station-building power supply device and method of controlling the same

Patent metadata

Field	Value
Publication number	US-9859715-B2
Application number	US-201214423829-A
Country	US
Kind code	B2
Filing date	Aug 29, 2012
Priority date	Aug 29, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

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.

First claim

The invention claimed is:

1. A station-building power supply device that is provided in each of one or more station buildings of electric railways and supplies low-voltage AC power to one or more station building facilities in each of the one or more station buildings, the station-building power supply device comprising:
a regenerative mode in which, when regenerative power regenerated by a train and supplied to an overhead wire exceeds a power-running electric power, surplus regenerative power supplied via the overhead wire and power supplied from a high-voltage distribution line are used together so as to supply the low-voltage AC power corresponding to an amount of normal power consumption of a station building; and
a standby power supply mode in which the low-voltage AC power corresponding to an amount of emergency power of the station building is supplied by using the regenerative power supplied from the overhead wire, when a power outage of the high-voltage distribution line occurs.

2. The station-building power supply device according to claim 1 , further comprising:
a first switch that switches the power supplied from the high-voltage distribution line;
a second switch that switches the power supplied from the overhead wire; and
a control unit that
in the regenerative mode, closes the first switch and the second switch, and
in the standby power supply mode, opens the first switch and closes the second switch.

3. The station-building power supply device according to claim 2 , further comprising:
a power conversion unit that converts DC power supplied from the overhead wire to the low-voltage AC power, wherein
the control unit
controls, in the regenerative mode, the power conversion unit so as to generate the low-voltage AC power corresponding to a part of the amount of normal power consumption corresponding to the surplus regenerative power, and
controls, in the standby power supply mode, the power conversion unit so as to continuously generate the low-voltage AC power corresponding to an entire amount of the emergency power.

4. The station-building power supply device according to claim 3 , further comprising:
an overhead-wire voltage detection unit that detects an overhead wire voltage, wherein
the control unit, when the overhead wire voltage exceeds a predetermined voltage threshold in the regenerative mode, determines that the surplus regenerative power is generated and controls the power conversion unit.

5. A method of controlling the station-building power supply device according to claim 3 , the method comprising:
detecting a power outage of the high-voltage distribution line, during an operation in the regenerative mode and deactivating the power conversion unit so as to stop the operation in the regenerative mode;
opening the first switch;
switching control software of the power conversion unit in the control unit to control software corresponding to the standby power supply mode;
activating the power conversion unit; and
starting an operation in the standby power supply mode.

6. A method of controlling the station-building power supply device according to claim 3 , the method comprising:
detecting recovery from a power outage of the high-voltage distribution line;
during an operation in the standby power supply mode, deactivating the power conversion unit;
stopping the operation in the standby power supply mode;
opening the second switch;
closing the first switch;
switching control software of the power conversion unit in the control unit to control software corresponding to the regenerative mode;
starting an operation of the power conversion unit;
closing the second switch; and
starting an operation in the regenerative mode.

7. The station-building power supply device according to claim 1 , wherein the regenerative power supplied from the overhead wire is the surplus regenerative power.

8. A station-building power supply device that is provided in each of one or more station buildings of electric railways and supplies low-voltage AC power to one or more station building facilities in each of the one or more station buildings, the station-building power supply device comprising:
a regenerative mode in which, when regenerative power regenerated by a train and supplied to an overhead wire exceeds a power-running electric power, surplus regenerative power supplied via the overhead wire and power supplied from a high-voltage distribution line are used together so as to supply the low-voltage AC power corresponding to an amount of normal power consumption of a station building;
a standby power supply mode in which the low-voltage AC power corresponding to an amount of emergency power of the station building is supplied by using power supplied from the overhead wire, when a power outage of the high-voltage distribution line occurs; and
a control unit to switch between the regenerative mode and the standby power supply mode.

9. The station-building power supply device according to claim 8 , further comprising:
a first switch that switches the power supplied from the high-voltage distribution line; and
a second switch that switches the power supplied from the overhead wire, wherein
the control unit
in the regenerative mode, closes the first switch and the second switch, and
in the standby power supply mode, opens the first switch and closes the second switch.

10. The station-building power supply device according to claim 9 , further comprising:
a power conversion unit that converts DC power supplied from the overhead wire to the low-voltage AC power, wherein
the control unit
controls, in the regenerative mode, the power conversion unit so as to generate the low-voltage AC power corresponding to a part of the amount of normal power consumption corresponding to the surplus regenerative power, and
controls, in the standby power supply mode, the power conversion unit so as to continuously generate the low-voltage AC power corresponding to an entire amount of the emergency power.

11. The station-building power supply device according to claim 10 , further comprising:
an overhead-wire voltage detection unit that detects an overhead wire voltage, wherein
the control unit, when the overhead wire voltage exceeds a predetermined voltage threshold in the regenerative mode, determines that the surplus regenerative power is generated and controls the power conversion unit.

12. A method of controlling the station-building power supply device according to claim 10 , the method comprising:
detecting a power outage of the high-voltage distribution line, during an operation in the regenerative mode and deactivating the power conversion unit so as to stop the operation in the regenerative mode;
opening the first switch;
switching control software of the power conversion unit in the control unit to control software corresponding to the standby power supply mode;
activating the power conversion unit, and
starting an operation in the standby power supply mode.

13. A method of controlling the station-building power supply device according to claim 10 , the method comprising:
detecting recovery from a power outage of the high-voltage distribution line;
during an operation in the standby power supply mode, deactivating the power conversion unit;
stopping the operation in the standby power supply mode;
opening the second switch;
closing the first switch;
switching control software of the power conversion unit in the control unit to control software corresponding to the regenerative mode;
starting an operation of the power conversion unit;
closing the second switch; and
starting an o

Assignees

• Tanaka Takeshi
• Matsumura Yasushi
• Okuda Wataru
• Ishikura Syuji
• Mitsubishi Electric Corp

Inventors

• Tanaka Takeshi
• Matsumura Yasushi
• Okuda Wataru
• Ishikura Syuji

Classifications

• H02J4/25 Primary

  for transfer of electric power between AC and DC networks, e.g. for supplying the DC section within a load from an AC mains system · CPC title

• H02J3/381

  Dispersed generators · CPC title

• H02J3/34

  Arrangements for transfer of electric power between networks of substantially different frequency · CPC title

• H02J3/04

  Arrangements for connecting networks of the same frequency but supplied from different sources · CPC title

• Y10T307/32

  Cross-Sectional Technologies · mapped topic