Method for power adaptation in an electricity network

• US 20060007613A1
• Filed: 06/30/2003
• Published: 01/12/2006
• Est. Priority Date: 07/04/2002
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Aerospace)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Althaus, Rolf, Koller, Martin, Wiederhold, Karl
• Granted Patent: US 7,110,865 B2
• Time in Patent Office: Days
• US Class Current: 361/62
• CPC Class Codes: H02J 15/006 in the form of pneumatic energy, e.g. compressed air energy storage [CAES] accumulators for supplying fluid under pressure F15B1/04
• CPC Class Codes: Y02E 60/16 Mechanical energy storage, e.g. flywheels or pressurised fluids

Abstract

According to the invention, power matching in an electricity grid (N) is carried out by regulation of a storage power station (S) which is operated in the grid. In the event of changes in the power available or in the power consumption in the grid, the power consumption of the power consuming machine (V) in the storage power station is adapted so as to maintain equilibrium between the total power generation and the total power consumption. Power matching by regulation of the power load can be carried out around one order of magnitude more quickly than power matching by regulation of power generating machines (G1, G2, G3, GS) which act on the grid, and saves alternating thermal loads in the power stations.

Claims

1. A method for power matching in an electricity grid, the grid comprising at least two power generating plants supplying power output into the grid, at least two power loads consuming power from the grid, at least one storage plant, at least one storage volume, at least one power generating machine for operation with an energy storage fluid which is stored in the storage volume, the power generating machine being connected to a generator which supplies electrical power during operation, at least one power consuming machine for feeding energy storage fluid into the storage volume, the power consuming machine being connected to a motor which consumes electrical power during operation, wherein, in a first operating state, an overall power supply includes the sum of the power output supplied from all the power generating plants and from the power generating machine and equals an overall power consumption that includes the sum of the power which is consumed by all the power loads and by the power consuming machine, such that the grid is in equilibrium, comprising:

upon a sudden change in power demanded from the storage plant, controlling the power consumption of the power consuming machine such as to maintain the equilibrium between the overall power consumption and the overall power supply into the grid, and

changing the power consumption of the power consuming machine in a direction opposite to the direction taken during controlling, with the changing in the power consumption being carried out slower than during controlling, and

the changing being at least partially compensated for by changing the power output of the power generating machine, such that,

when an initial rise occurs in the power demand, the power consumption of the power consuming machine is reduced, and the power output of the power generating machine is successively increased with the power consumption of the power consuming machine being increased, and

when an initial drop occurs in the power demand, the power consumption of the power consuming machine is increased, and the power output of the power generating machine is successively reduced with the power consumption of the power consuming machine being reduced.

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

carrying out power matching by controlling the power consumption of the at least one power consuming machine in the at least one storage plant and any frequency response capabilities which may be present, wherein the power output from the at least one power generating machine of the at least one storage plant and other power plants connected to the grid is maintained constant.

3. The method as claimed in claim 1, wherein power consumption of the power consuming machine is reduced when one of the power generating plants is disconnected from the grid or when one of the loads is connected to the grid.

4. The method as claimed in claim 3, wherein the drive motor for the power consuming machine is completely disconnected from the grid.

5. The method as claimed in claim 1, wherein power consumption of the power consuming machine is increased when one of the loads is disconnected from the grid or is rapidly deloaded.

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

operating the at least one power consuming machine in the at least one storage plant at at least 80% of its maximum power consumption in order to maintain a maximum power dynamic response, and

synchronizing and connecting the generator of the at least one power generating machine in said storage plant to the grid, and operating the power generating machine at a minimum permissible power.

7. The method as claimed in claim 6, further comprising:

operating the power generating machine at less than 20% of its maximum power output.

10. The method as claimed in claim 2, wherein power consumption of the power consuming machine is reduced when one of the power generating plants is disconnected from the grid or when one of the loads is connected to the grid.

11. The method as claimed in claim 10, wherein the drive motor for the power consuming machine is completely disconnected from the grid.

12. The method as claimed in claim 2, wherein power consumption of the power consuming machine is increased when one of the loads is disconnected from the grid or is rapidly deloaded.

13. The method as claimed in claim 2 further comprising, operating the at least one power consuming machine in the at least one storage plant at at least 80% of its maximum power consumption in order to maintain a maximum power dynamic response, and

synchronizing and connecting the generator of the at least one power generating machine in said storage plant to the grid, and operating the power generating machine at a minimum permissible power.

14. The method as claimed in claim 3 further comprising,

operating the at least one power consuming machine in the at least one storage plant at at least 80% of its maximum power consumption in order to maintain a maximum power dynamic response, and

synchronizing and connecting the generator of the at least one power generating machine in said storage plant to the grid, and operating the power generating machine at a minimum permissible power.

15. The method as claimed in claim 4 further comprising,

operating the at least one power consuming machine in the at least one storage plant at at least 80% of its maximum power consumption in order to maintain a maximum power dynamic response, and

synchronizing and connecting the generator of the at least one power generating machine in said storage plant to the grid, and operating the power generating machine at a minimum permissible power.

16. The method as claimed in claim 5 further comprising,

operating the at least one power consuming machine in the at least one storage plant at at least 80% of its maximum power consumption in order to maintain a maximum power dynamic response, and

synchronizing and connecting the generator of the at least one power generating machine in said storage plant to the grid, and operating the power generating machine at a minimum permissible power.

17. The method as claimed in claim 13, further comprising:

operating the power generating machine at less than 20% of its maximum power output.

18. The method as claimed in claim 14, further comprising:

operating the power generating machine at less than 20% of its maximum power output.

19. The method as claimed in claim 15, further comprising:

operating the power generating machine at less than 20% of its maximum power output.

20. The method as claimed in claim 16, further comprising:

operating the power generating machine at less than 20% of its maximum power output.

21. The method as claimed in claim 6, further comprising:

operating the power generating machine at less than 10% of its maximum power output.

22. The method as claimed in claim 13, further comprising:

operating the power generating machine at less than 10% of its maximum power output.

8. (canceled)

9. (canceled)