Method for providing control power to stabilize an alternating current network, using an energy accumulator

• US 9,948,096 B2
• Filed: 12/09/2013
• Issued: 04/17/2018
• Est. Priority Date: 12/21/2012
• Status: Expired due to Fees

• Current Assignee: Steag Power Saar GmbH (KSBG Kommunale Beteiligungsgesellschaft GmbH & Company KG), Evonik Degussa GmbH (Rag-Stiftung)
• Original Assignee: Steag Power Saar GmbH (KSBG Kommunale Beteiligungsgesellschaft GmbH & Company KG), Evonik Degussa GmbH (Rag-Stiftung)
• Inventors: Markowz, Georg, Kolligs, Carsten, Simsek, Erdem, Flemming, Anna, Gamrad, Dennis, Cochet, Sebastien, Schweissthal, Wolfgang
• Primary Examiner(s): Nguyen, Hai L
• Application Number:
  US14/654,367
• Publication Number:
  US 20150311712A1
• Time in Patent Office: 1,590 Days
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/241 The oscillation concerning frequency
• CPC Class Codes: H02J 3/28 Arrangements for balancing of the load in a network by storage of energy

Abstract

The present invention relates to a method for providing control power to stabilize an AC electrical grid, comprising an energy store which can take up and emit electrical energy, wherein for the purpose of providing the control power, the energy store is used together with a differential power provider, wherein the AC electrical grid operates at a predefined frequency and a frequency band around the predefined frequency is defined and the control power to be provided in the case of a frequency deviation within the frequency band is provided by the energy store to the extent of more than 50%, relative to the total control power to be provided.

Claims

1. A method for providing control power to stabilize an AC electrical grid that operates at a predefined frequency, the method comprising:

taking up and emitting electrical energy via an energy storage device; and

providing the control power, using the energy storage device together with a differential power provider including;

in a case of a frequency deviation within a frequency band defined around the predefined frequent, providing, by the energy storage device, more than 50% of a total of the control power to be provided, and

in a case of a frequency deviation outside the frequency band, providing, by the differential power provider, more than 50% of the total of the control power to be provided.

2. The method as claimed in claim 1, wherein providing the control power using the energy storage device together with the differential power provider includes:

in the case of the frequency deviation within the frequency band, providing, by the energy storage device, more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, providing, by the differential power provider, more than 80% of the total of the control power to be provided.

3. The method as claimed in claim 2, wherein the differential power provider includes at least one of a block-type power plant and a combined heat and power installation.

4. The method as claimed in claim 3, wherein the differential power provider includes an industrial installation.

5. The method as claimed in claim 2, wherein the differential power provider includes an industrial installation.

6. The method as claimed in claim 1, wherein at least one of a width of the frequency band and a position of the frequency band is chosen depending on a state of charge of the energy storage device.

7. The method as claimed in claim 6, wherein the frequency band has a bandwidth in a range of 20 to 400 mHz.

8. The method as claimed in claim 6, wherein providing the control power using the energy storage device together with the differential power provider includes:

in the case of the frequency deviation within the frequency band, providing, by the energy storage device, more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, providing, by the differential power provider, more than 80% of the total of the control power to be provided.

9. The method as claimed in claim 8, wherein the differential power provider includes at least one of a block-type power plant and a combined heat and power installation.

10. The method as claimed in claim 9, wherein the differential power provider includes an industrial installation.

11. The method as claimed in claim 8, wherein the differential power provider includes an industrial installation.

12. The method as claimed in claim 1, further comprising:

operating at least one energy generator and at least one energy consumer jointly as differential power provider,

restricting power drawn from the AC electrical grid by the at least one energy consumer in order to provide a positive control power, and

restricting power fed into the AC electrical grid by the at least one energy generator in order to provide a negative control power.

13. The method as claimed in claim 12, wherein at least one of a width of the frequency band and a position of the frequency band is chosen depending on a state of charge of the energy storage device.

14. The method as claimed in claim 13, wherein the frequency band has a bandwidth in a range of 20 to 400 mHz.

15. The method as claimed in claim 13, wherein providing the control power using the energy storage device together with the differential power provider includes:

in the case of the frequency deviation within the frequency band, providing, by the energy storage device, more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, providing, by the differential power provider, more than 80% of the total of the control power to be provided.

16. The method as claimed in claim 15, wherein the differential power provider includes at least one of a block-type power plant and a combined heat and power installation.

17. The method as claimed in claim 16, wherein the differential power provider includes an industrial installation.

18. The method as claimed in claim 15, wherein the differential power provider includes an industrial installation.

19. The method as claimed in claim 1, wherein the differential power provider includes at least one of a block-type power plant and a combined heat and power installation.

20. The method as claimed in claim 19, wherein the differential power provider includes an industrial installation.

21. The method as claimed in claim 1, wherein the differential power provider includes an industrial installation.

22. The method as claimed in claim 1, wherein providing the control power using the energy storage device together with the differential power provider includes:

in a case of a permanent frequency deviation outside the frequency band over a defined period of time, providing, by the differential power provider, more than 50%, and

in a case of a permanent frequency deviation within the frequency band, providing, by the differential power provider, at most 20% of the total of the control power to be provided.

23. The method as claimed in claim 1, wherein the differential power provider includes exclusively one or a plurality of energy generators which provide both positive and negative control power.

24. The method as claimed in claim 1, wherein the differential power provider includes exclusively one or a plurality of energy consumers which provide both positive and negative control power.

25. The method as claimed in claim 1, wherein the differential power provider can increase or decrease at least one of power uptake and power output within 30 s by at least 75% of a maximum of the control power to be provided.

26. The method as claimed in claim 1, wherein the energy storage device is a lithium-ion accumulator.

27. The method as claimed in claim 26, wherein the lithium-ion accumulator can store at least an energy of 4 kWh.

28. A device for providing control power to stabilize an AC electrical grid that operates at a predefined frequency, the device comprising:

at least one energy storage device;

at least one differential power provider connected to the AC electrical grid in such a way that energy can be fed into the AC electrical grid and can be drawn from the AC electrical grid by the device; and

a controller configured to control power of the at least one energy storage device and the at least one differential power provider in an open-loop or closed-loop manner, wherein the controller is configured to;

in a case of a frequency deviation within a frequency band defined around the predefined frequency, control the energy storage device to provide more than 50% of a total of the control power to be provided, and

in a case of a frequency deviation outside the frequency band, control the differential power provider to provide more than 50% of the total of the control power to be provided.

29. The device as claimed in claim 28, wherein the controller is configured to:

in the case of the frequency deviation within the frequency band, control the energy storage device to provide more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, control the differential power provider to provide more than 80% of the total of the control power to be provided.

30. The device as claimed in claim 29, wherein

the differential power provider includes a block-type power plant controllable in the closed-loop manner,

the block-type power plant includes at least two steam turbines which operate at a different pressure,

a control valve is provided between a boiler and a high-pressure turbine, and

a valve is provided between a preheater and a low-pressure turbine.

31. The device as claimed in claim 30, wherein the differential power provider includes an industrial installation.

32. The device as claimed in claim 29, wherein the differential power provider includes a combined heat and power installation comprising at least one heat accumulator.

33. The device as claimed in claim 32, wherein the differential power provider includes an industrial installation.

34. The device as claimed in claim 29, wherein the differential power provider includes an industrial installation.

35. The device as claimed in claim 28, wherein the controller is configured to choose at least one of a width of the frequency band and a position of the frequency band depending on a state of charge of the energy storage device.

36. The device as claimed in claim 35, wherein the frequency band has a bandwidth in a range of 20 to 400 mHz.

37. The device as claimed in claim 36, wherein the controller is configured to:

in the case of the frequency deviation within the frequency band, control the energy storage device to provide more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, control the differential power provider to provide more than 80% of the total of the control power to be provided.

38. The device as claimed in claim 35, wherein the controller is configured to:

in the case of the frequency deviation within the frequency band, control the energy storage device to provide more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, control the differential power provider to provide more than 80% of the total of the control power to be provided.

39. The device as claimed in claim 38, wherein the differential power provider includes i-s-a block-type power plant controllable in the closed-loop manner,

the block-type power plant includes at least two steam turbines which operate at a different pressure,

a control valve is provided between a boiler and a high-pressure turbine, and

a valve is provided between a preheater and a low-pressure turbine.

40. The device as claimed in claim 39, wherein the differential power provider includes an industrial installation.

41. The device as claimed in claim 38, wherein the differential power provider includes a combined heat and power installation comprising at least one heat accumulator.

42. The device as claimed in claim 41, wherein the differential power provider includes an industrial installation.

43. The device as claimed in claim 38, wherein the differential power provider includes an industrial installation.

44. The device as claimed in claim 28, wherein the controller is configured to:

jointly operate at least one energy generator and at least one energy consumer as the differential power provider,

restrict power drawn from the AC electrical grid by the at least one energy consumer in order to provide a positive control power, and

restrict power fed into the AC electrical grid by the at least one energy generator in order to provide a negative control power.

45. The device as claimed in claim 44, wherein the controller is configured to choose at least one of a width of the frequency band and a position of the frequency band depending on a state of charge of the energy storage device.

46. The device as claimed in claim 45, wherein the frequency band has a bandwidth in a range of 20 to 400 mHz.

47. The device as claimed in claim 46, wherein the controller is configured to:

in the case of the frequency deviation within the frequency band, control the energy storage device to provide more than 80% of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, control the differential power provider to provide more than 80% of the total of the control power to be provided.

48. The device as claimed in claim 45, wherein the controller is configured to:

in the case of the frequency deviation within the frequency band, control the energy storage device to provide more than 80% of the total of the control power to be provided, and

in the case of the frequency deviation outside the frequency band, control the differential power provider to provide more than 80% of the total of the control power to be provided.

49. The device as claimed in claim 48, wherein

the differential power provider includes a block-type power plant controllable in the closed-loop manner,

the block-type power plant includes at least two steam turbines which operate at a different pressure,

a control valve is provided between a boiler and a high-pressure turbine, and

a valve is provided between a preheater and a low-pressure turbine.

50. The device as claimed in claim 49, wherein the differential power provider includes an industrial installation.

51. The device as claimed in claim 48, wherein the differential power provider includes a combined heat and power installation comprising at least one heat accumulator.

52. The device as claimed in claim 51, wherein the differential power provider includes an industrial installation.

53. The device as claimed in claim 48, wherein the differential power provider includes an industrial installation.

54. The device as claimed in claim 28, wherein

the differential power provider includes a block-type power plant controllable in the closed-loop manner,

the block-type power plant includes at least two steam turbines which operate at a different pressure,

a control valve is provided between a boiler and a high-pressure turbine, and

a valve is provided between a preheater and a low-pressure turbine.

55. The device as claimed in claim 54, wherein the differential power provider includes an industrial installation.

56. The device as claimed in claim 28, wherein the differential power provider includes a combined heat and power installation comprising at least one heat accumulator.

57. The device as claimed in claim 56, wherein the differential power provider includes an industrial installation.

58. The device as claimed in claim 28, wherein the differential power provider includes an industrial installation.