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

Patent metadata

Field	Value
Publication number	US-9948096-B2
Application number	US-201314654367-A
Country	US
Kind code	B2
Filing date	Dec 9, 2013
Priority date	Dec 21, 2012
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

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.

First claim

The invention claimed is:

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

Assignees

• Markowz Georg
• Kolligs Carsten
• Simsek Erdem
• Flemming Anna
• Gamrad Dennis
• Cochet Sebastien
• Schweissthal Wolfgang
• Evonik Degussa Gmbh
• Steag Power Saar Gmbh

Inventors

• Markowz Georg
• Kolligs Carsten
• Simsek Erdem
• Flemming Anna
• Gamrad Dennis
• Cochet Sebastien
• Schweissthal Wolfgang

Classifications

• H02J3/00142 Primary

  Oscillations concerning frequency · CPC title

• H02J3/24

  Electricity · mapped topic

• H02J3/28

  Arrangements for balancing of the load in networks by storage of energy · CPC title

• H02J3/00 Primary

  Circuit arrangements for AC mains or AC distribution networks · CPC title