Modular energy storage system

• US 9,537,318 B2
• Filed: 11/02/2012
• Issued: 01/03/2017
• Est. Priority Date: 11/04/2011
• Status: Expired due to Fees

• Current Assignee: Doosan Gridtech, Inc. (Doosan Enerbility Company Limited)
• Original Assignee: Doosan Gridtech, Inc. (Doosan Enerbility Company Limited)
• Inventors: Kaplan, David L., Kaplan, Joshua I., Darlington, Gregory P.
• Primary Examiner(s): Kitov, Zeev V
• Application Number:
  US13/668,172
• Publication Number:
  US 20130113294A1
• Time in Patent Office: 1,523 Days
• US Class Current: 1/1
• CPC Class Codes: H02J 3/28 Arrangements for balancing of the load in a network by storage of energy
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• 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: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

An energy storage system includes modular energy storage equipment that may be connected to an external system, such as a power grid. In at least one embodiment, the energy storage system includes a power transfer control system comprising a power transfer network and a processing module or controller. The power transfer network has a first interface coupleable to one or more energy storage units and a second interface coupleable to one or more power conversion units. One or more conductors in the power transfer network are selectively coupleable to the first interface and the second interface for transferring power between the energy storage units and the power conversion units based at least in part on information indicating a power or energy supply or demand of an external system or information indicating an amount of energy stored in the energy storage units. The energy storage system is scalable for different implementations.

Claims

1. An energy storage system, comprising:

one or more energy storage units;

one or more power conversion units coupleable to an external system;

a power transfer network coupled to the one or more energy storage units via a first interface and to the one or more power conversion units via a second interface, wherein the power transfer network includes one or more conductors that are coupleable to the first interface and to the second interface for transferring power between the one or more energy storage units and the one or more power conversion units, wherein the power conversion units are configured to convert an electrical parameter of power transferred to and from the energy storage units in accordance with an electrical requirement of the external system or the one or more energy storage units; and

a controller in communication with the power transfer network, wherein the controller is configured to selectively cause one or more of the conductors in the power transfer network to electrically connect one or more of the energy storage units to one or more of the power conversion units based at least in part on a power or energy demand of the external system and an age of the one or more energy storage units such that older energy storage units are connected to external systems having lower power or energy demands.

2. The energy storage system of claim 1, wherein at least one of the energy storage units differs from another of the energy storage units with regard to an electrical characteristic.

3. The energy storage system of claim 2, wherein the electrical characteristic is at least one of energy capacity, power capacity, current capacity, or voltage.

4. The energy storage system of claim 1, wherein at least one of the energy storage units differs from another of the energy storage units with regard to a physical characteristic.

5. The energy storage system of claim 1, wherein at least one of the power conversion units differs from another of the power conversion units with regard to an electrical characteristic.

6. The energy storage system of claim 5, wherein the electrical characteristic is at least one of power capacity, current capacity, or voltage.

7. The energy storage system of claim 1, wherein at least one of the power conversion units differs from another of the power conversion units with regard to a physical characteristic.

8. The energy storage system of claim 1, wherein the energy storage system comprises more energy storage units than power conversion units.

9. The energy storage system of claim 1, wherein the energy storage system comprises more power conversion units than energy storage units.

10. The energy storage system of claim 1, wherein the one or more power conversion units are coupleable to a power grid operated by an electric utility.

11. The energy storage system of claim 1, wherein the controller is configured to communicate with the power transfer network using a standardized, publicly available protocol.

12. The energy storage system of claim 1, wherein the controller is further configured to communicate with one or more of the energy storage units.

13. The energy storage system of claim 1, wherein the controller is further configured to communicate with one or more of the power conversion units.

14. The energy storage system of claim 1, wherein the controller is further configured to communicate with a controller of another energy storage system according to claim 1.

15. The energy storage system of claim 1, wherein at least one of the energy storage units is housed physically separate from another energy storage unit in the energy storage system.

16. The energy storage system of claim 1, wherein at least one of the power conversion units is housed physically separate from another power conversion unit in the energy storage system.

17. The energy storage system of claim 1, wherein the controller selectively causes a conductor in the power transfer network to electrically connect an energy storage unit to a power conversion unit based on an electrical characteristic of the energy storage unit.

18. The energy storage system of claim 17, wherein the electrical characteristic of the energy storage unit is at least one of state-of-charge, cycle life, calendar life, voltage, current, power or temperature.

19. The energy storage system of claim 1, wherein the controller selectively causes a conductor in the power transfer network to electrically connect an energy storage unit to a power conversion unit based on an electrical characteristic of the power conversion unit.

20. The energy storage system of claim 19, wherein the electrical characteristic of the power conversion unit is at least one of instantaneous voltage, instantaneous current, or instantaneous power.

21. The energy storage system of claim 1, wherein the one or more energy storage units or the one or more power conversion units are classified according to an operational attribute characterizing their ability to electrically connect to a common conductor in the power transfer network.

22. The energy storage system of claim 1, wherein the power transfer network includes one or more switches that are responsive to the controller to selectively electrically connect a conductor in the power transfer network to an energy storage unit and to a power conversion unit.

23. The energy storage system of claim 1, wherein the first interface defines one or more modular points of connection with specified electrical and physical characteristics to which the one or more energy storage units conform for coupling to the power transfer network.

24. The energy storage system of claim 1, wherein the second interface defines one or more modular points of connection with specified electrical and physical characteristics to which the one or more power conversion units conform for coupling to the power transfer network.

25. The energy storage system of claim 1, wherein an energy storage unit or a power conversion unit is electrically connected to a conductor in the power transfer network via a DC/DC converter.

26. A power transfer control system for an energy storage network, comprising:

a power transfer network having a first interface coupleable to one or more energy storage units and a second interface coupleable to one or more power conversion units, wherein the power transfer network includes one or more conductors that are coupleable to the first interface and to the second interface for transferring power to and from one or more energy storage units and one or more power conversion units; and

a processing module configured to receive information indicating a power or energy demand of an external system and information indicating an age of one or more energy storage units coupled to the first interface, and based at least in part on the received information, selectively cause one or more conductors of the power transfer network to electrically connect one or more of the energy storage units via the first interface to one or more of the power conversion units via the second interface and transfer power between the one or more energy storage units and the one or more power conversion units such that older energy storage units are connected to external systems having lower power or energy demands.

27. The power transfer control system of claim 26, wherein the first interface is coupleable to energy storage units that differ with regard to an electrical characteristic.

28. The power transfer control system of claim 27, wherein the electrical characteristic is at least one of energy capacity, power capacity, current capacity, or voltage.

29. The power transfer control system of claim 26, wherein the first interface is coupleable to energy storage units that differ with regard to a physical characteristic.

30. The power transfer control system of claim 26, wherein the second interface is coupleable to power conversion units that differ with regard to an electrical characteristic.

31. The power transfer control system of claim 30, wherein the electrical characteristic is at least one of power capacity, current capacity, or voltage.

32. The power transfer control system of claim 26, wherein the second interface is coupleable to power conversion units that differ with regard to a physical characteristic.

33. The power transfer control system of claim 26, wherein the first interface is coupleable to more energy storage units than power conversion units.

34. The power transfer control system of claim 26, wherein the second interface is coupleable to more power conversion units than energy storage units.

35. The power transfer control system of claim 26, wherein the processing module is configured to communicate with the power transfer network using a standardized, publicly available protocol.

36. The power transfer control system of claim 26, wherein the processing module is configured to communicate with one or more energy storage units.

37. The power transfer control system of claim 26, wherein the processing module is configured to communicate with one or more power conversion units.

38. The power transfer control system of claim 26, wherein the processing module is configured to communicate with a processing module of another power transfer control system according to claim 26.

39. The power transfer control system of claim 26, wherein the processing module is configured to selectively cause a conductor in the power transfer network to electrically connect an energy storage unit to a power conversion unit based on an electrical characteristic of the energy storage unit.

40. The power transfer control system of claim 39, wherein the electrical characteristic of the energy storage unit is at least one of state-of-charge, cycle life, calendar life, voltage, current, power or temperature.

41. The power transfer control system of claim 26, wherein the processing module is configured to selectively cause a conductor in the power transfer network to electrically connect an energy storage unit to a power conversion unit based on an electrical characteristic of the power conversion unit.

42. The power transfer control system of claim 41, wherein the electrical characteristic of the power conversion unit is at least one of voltage, current, or power.

43. The power transfer control system of claim 26, wherein the power transfer network includes one or more switches that are responsive to the processing module to selectively electrically connect a conductor in the power transfer network to an energy storage unit and to a power conversion unit.

44. The power transfer control system of claim 26, wherein the first interface defines one or more modular points of connection with specified electrical and physical characteristics to which the one or more energy storage units conform for coupling to the power transfer network.

45. The power transfer control system of claim 26, wherein the second interface defines one or more modular points of connection with specified electrical and physical characteristics to which the one or more power conversion units conform for coupling to the power transfer network.

46. A computer-readable storage medium having computer-executable instructions stored thereon, wherein in response to execution by a computing device, the instructions cause the computing device to:

receive information indicating a power or energy demand of an external system and information indicating an age of one or more energy storage units that are coupleable to a first interface of a power transfer network, the power transfer network having a second interface coupleable to one or more power conversion units for transferring power to and from the one or more energy storage units and the one or more power conversion units; and

based at least in part on the received information, selectively cause one or more conductors of the power transfer network to electrically connect one or more of the energy storage units via the first interface of the power transfer network to one or more power conversion units via the second interface of the power transfer network, and transfer power between the one or more energy storage units and the one or more power conversion units such that older energy storage units are connected to external systems having lower power or energy demands.

47. The computer-readable storage medium of claim 46, wherein the computing device selectively causes a conductor in the power transfer network to electrically connect an energy storage unit to a power conversion unit based on an electrical characteristic of the energy storage unit.

48. The computer-readable storage medium of claim 46, wherein computing device selectively cause a conductor in the power transfer network to electrically connect an energy storage unit to a power conversion unit based on an electrical characteristic of the power conversion unit.

49. The computer-readable storage medium of claim 46, wherein the instructions, in response to execution, cause the computing device to operate one or more switches in the power transfer network to selectively electrically connect the one or more conductors of the power transfer network to the one or more energy storage units and to the one or more power conversion units.

50. The computer-readable storage medium of claim 46, wherein the instructions, in response to execution, cause the computing device to control the power transfer between the one or more energy storage units and the one or more power conversion units using pulse-width modulation.