System and Method for Reinjection of Retard Energy in a Trolley-Based Electric Mining Haul Truck

• US 20120175209A1
• Filed: 03/21/2012
• Published: 07/12/2012
• Est. Priority Date: 10/23/2009
• Status: Active Grant

• Current Assignee: Siemens Large Drives LLC (Siemens AG)
• Original Assignee: Siemens Industry Incorporated (Siemens AG)
• Inventors: Mazumdar, Joy, Köllner, Walter
• Granted Patent: US 8,550,008 B2
• Time in Patent Office: Days
• US Class Current: 191/2
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 2200/44 Industrial trucks or floor conveyors
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 7/10 Dynamic electric regenerative braking B60L7/22 takes precedence
• CPC Class Codes: B60M 3/06 Arrangements for consuming regenerative power
• CPC Class Codes: B60M 7/00 Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 7/28 using magnetic devices with controllable degree of saturation in combination with controlled discharge tube or controlled semiconductor device
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02P 90/60 Electric or hybrid propulsion means for production processes
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]

Abstract

Retard energy regenerated from an electrical motor during braking action is reinjected into a power system via trolley lines. The retard energy may be transmitted to a bidirectional electric substation and returned to a utility grid. The retard energy may also be transmitted to an auxiliary energy storage system, such as an ultracapacitor system or a battery system. Installing trolley lines for mining haul trucks on a downhill slope may be used to capture and re-use substantial quantities of retard energy.

Claims

1. A method for reinjecting retard energy regenerated from an electrical motor on a vehicle, the method comprising:

transmitting via trolley lines at least a portion of the retard energy regenerated during at least one retard interval to a bidirectional electric substation.

2. The method of claim 1, wherein the vehicle comprises a mining haul truck.

3. The method of claim 2, wherein the at least one retard interval occurs while the mining haul truck is travelling downhill.

4. The method of claim 1 further comprising charging an on-board electrical energy storage system with at least a portion of the retard energy.

5. The method of claim 4, wherein the on-board electrical energy storage system comprises at least one ultracapacitor.

6. The method of claim 4, wherein the on-board electrical energy storage system comprises at least one battery.

7. The method of claim 4, further comprising supplying electrical power to the electrical motor from the on-board electrical energy storage system.

8. A method for storing retard energy regenerated from an electrical motor on a vehicle, the method comprising:

transmitting via trolley lines at least a portion of the retard energy regenerated during at least one retard interval to an auxiliary electrical energy storage system; and

charging the auxiliary electrical energy storage system h at least a portion of the retard energy.

9. The method of claim 8, wherein the vehicle comprises a mining haul truck.

10. The method of claim 9, wherein the at least one retard interval occurs while the mining haul truck is travelling downhill.

11. The method of claim 8, wherein the auxiliary electrical energy storage system comprises at least one ultracapacitor.

12. The method of claim 8, wherein the auxiliary electrical energy storage system comprises at least one battery.

13. The method of claim 8, further comprising transmitting at least a portion of the retard energy to a unidirectional electric substation via at least one of;

the trolley lines; and

the auxiliary electrical energy storage system.

14. The method of claim 13, further comprising charging the auxiliary electrical energy storage system with electrical power supplied from the unidirectional electric substation.

15. The method of claim 8, further comprising transmitting at least a portion of the retard energy to a bidirectional electric substation via at least one of:

the trolley lines; and

the auxiliary electrical energy storage system.

16. The method of claim 15, further comprising charging the auxiliary electrical energy storage system with electrical power supplied from the bidirectional electric substation.

17. The method of claim 8 further comprising supplying electrical power to the trolley lines from the auxiliary electrical energy storage system.

18. The method of claim 8 further comprising charging an on-board electrical energy storage system with at least a portion of the retard energy.

19. The method of claim 18, wherein the on-board electrical energy storage system comprises at least one ultracapacitor.

20. The method of claim 18, wherein the on-board electrical energy storage system comprises at least one battery.

21. The method of claim 18, further comprising supplying electrical power to the electrical motor from the on-board electrical energy storage system.