Braking recovery system and method for train, and train

Patent metadata

Field	Value
Publication number	US-11465508-B2
Application number	US-201716335400-A
Country	US
Kind code	B2
Filing date	Feb 28, 2017
Priority date	Sep 21, 2016
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

This disclosure discloses a braking-recovery system and method for a train, and a train. The system includes: a traction network, a train, and an energy storage power station. The energy storage power station is connected to the traction network, the energy storage power station includes a second controller, and the second controller controls the energy storage power station according to the voltage of the traction network to perform charging or discharging. The train includes: an electric brake; a battery; a distributor, connected to the electric brake, where there is a node between the distributor and the electric brake; a bidirectional DC/DC converter, where one end of the bidirectional DC/DC converter is connected to the battery, and another end of the bidirectional DC/DC converter is connected to the node; and a first controller, used to control, when the train is braked, the distributor and the bidirectional DC/DC converter to feed back braking electric energy of the train to the traction network, and control the bidirectional DC/DC converter according to a voltage of the traction network to absorb the braking electric energy of the train by using the battery.

First claim

What is claimed is:

1. A braking-recovery system for a train, comprising:
a traction network;
a train, wherein the train comprises:
an electric brake;
a battery;
a distributor, wherein the distributor is connected to the electric brake, and there is a node between the distributor and the electric brake;
a bidirectional DC/DC converter, wherein one end of the bidirectional DC/DC converter is connected to the battery, and another end of the bidirectional DC/DC converter is connected to the node; and
a first controller, wherein the first controller is connected to the distributor and the bidirectional DC/DC converter, and the first controller is used to control, when the train is braked, the distributor and the bidirectional DC/DC converter to feed back braking electric energy of the train to the traction network, and control the bidirectional DC/DC converter according to a voltage of the traction network to absorb the braking electric energy of the train by using the battery; and

an energy storage power station, wherein the energy storage power station is connected to the traction network, the energy storage power station comprises a second controller, and the second controller is used to control the energy storage power station according to the voltage of the traction network to perform charging or discharging.

2. The braking-recovery system for a train according to claim 1 , wherein the first controller is used to control, when the voltage of the traction network is greater than a first preset threshold, the bidirectional DC/DC converter to enter a charging mode to enable the battery to absorb the braking electric energy.

3. The braking-recovery system for a train according to claim 1 , wherein
the first controller is used to control, when the voltage of the traction network is less than a second preset threshold, the bidirectional DC/DC converter to be disabled to enable the battery to stop absorbing the braking electric energy, wherein the second preset threshold is less than the first preset threshold.

4. The braking-recovery system for a train according to claim 1 , wherein the train further comprises:
a power level detector, wherein the power level detector is connected to the first controller, and the power level detector is used to detect a power level of the battery, wherein when the battery absorbs the braking electric energy, the first controller is further used to control, when the power level of the battery is greater than a first power level threshold, the bidirectional DC/DC converter to be disabled to enable the battery to stop absorbing the braking electric energy.

5. The braking-recovery system for a train according to claim 1 , wherein the train further comprises:
a mechanical brake, used to mechanically brake the train.

6. The braking-recovery system for a train according to claim 5 , wherein
after the battery absorbs the braking electric energy, the first controller is further used to control, when the voltage of the traction network is greater than a third preset threshold, the mechanical brake to be started to brake the train in cooperation with the electric brake, wherein the third preset threshold is greater than the first preset threshold.

7. The braking-recovery system for a train according to claim 1 , wherein
the second controller is used to control, when the voltage of the traction network is greater than a fourth preset threshold, the energy storage power station to perform charging.

8. The braking-recovery system for a train according to claim 7 , wherein
the second controller is used to control, when the voltage of the traction network is less than a fifth preset threshold, the energy storage power station to perform discharging, wherein the fifth preset threshold is less than the fourth preset threshold.

9. The braking-recovery system for a train according to claim 8 , wherein after the energy storage power station discharges to the traction network, the second controller is further used to control, when the voltage of the traction network is greater than a sixth preset threshold, the energy storage power station to stop discharging, wherein the sixth preset threshold is greater than the fifth preset threshold.

10. The braking-recovery system for a train according to claim 8 , wherein
when the voltage of the traction network is less than a seventh preset threshold, the second controller controls the energy storage power station to discharge to the traction network, and at the same time, the first controller controls the bidirectional DC/DC converter to enter a discharging mode to enable the battery of the train to discharge to the traction network, wherein the seventh preset threshold is less than the fifth preset threshold.

11. The braking-recovery system for a train according to claim 10 , wherein when the battery discharges to the traction network, the first controller is further used to control, when the power level of the battery is less than a second power level threshold, the bidirectional DC/DC converter to be disabled to enable the battery to stop discharging.

12. The braking-recovery system for a train according to claim 1 , wherein the train further comprises:
a contactor detector, wherein the contactor detector is connected to the first controller, and the contactor detector is used to detect whether a contactor of the train is disconnected, wherein the first controller is further used to: after the contactor is disconnected, control the distributor to be disabled, control the bidirectional DC/DC converter to enter the discharging mode to enable the battery to supply power to the train, and control the train to run at limited power.

13. The braking-recovery system for a train according to claim 1 , wherein there is a plurality of energy storage power stations, and the plurality of energy storage power stations is spaced apart according to a preset distance.

14. A train, comprising:
an electric brake;
a battery;
a distributor, wherein the distributor is connected to the electric brake, and there is a node between the distributor and the electric brake;
a bidirectional DC/DC converter, wherein one end of the bidirectional DC/DC converter is connected to the battery, and another end of the bidirectional DC/DC converter is connected to the node; and
a first controller, wherein the first controller is connected to the distributor and the bidirectional DC/DC converter, and the first controller is used to control, when the train is braked, the distributor and the bidirectional DC/DC converter to feed back braking electric energy of the train to the traction network, and control the bidirectional DC/DC converter according to a voltage of the traction network to absorb the braking electric energy of the train by using the battery.

15. The train according to claim 14 , wherein
the first controller is used to control, when the voltage of the traction network is greater than a first preset threshold, the bidirectional DC/DC converter to enter a charging mode to enable the battery to absorb the braking electric energy.

16. The train according to claim 14 , wherein the first controller is used to:
control, when the voltage of the traction network is less than a second preset threshold, the bidirectional DC/DC converter to be disabled to enable the battery to stop absorbing the braking electric energy, wherein the second preset threshold is less than the first preset threshold.

17. The train according to claim 16 , further comprising:
a power level detector, wherein the power level detector is connected to the first c

Assignees

• Byd Co Ltd

Inventors

• Ren Lin
• Li Daolin
• Luo Wengang

Classifications

• B60L2200/26

  Rail vehicles · CPC title

• B60M3/06

  Arrangements for consuming regenerative power · CPC title

• Y02T10/92

  Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles · CPC title

• B60M3/00

  Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power (controlling rail vehicles by varying voltage of power fed to vehicle B60L; power distribution in general H02J) · CPC title

• B60L7/10 Primary

  Dynamic electric regenerative braking (B60L7/22 takes precedence) · CPC title