WIND FARM WITH PLURAL WIND TURBINES, AND METHOD FOR REGULATING THE ENERGY FEED FROM A WIND FARM

• US 20100268393A1
• Filed: 06/22/2009
• Published: 10/21/2010
• Est. Priority Date: 04/17/2009
• Status: Active Grant

• Current Assignee: Nordex Energy SE & Company KG (Nordex Se)
• Original Assignee: Nordex Energy GmbH (Nordex Se)
• Inventors: Fischle, Kurt, Harms, Ulrich
• Granted Patent: US 8,332,076 B2
• Time in Patent Office: Days
• US Class Current: 700/287
• CPC Class Codes: F03D 7/028 controlling wind motor output power
• CPC Class Codes: F03D 7/047 characterised by the controller architecture, e.g. multiple processors or data communications
• CPC Class Codes: F03D 7/048 controlling wind farms
• CPC Class Codes: F05B 2240/96 as part of a wind turbine farm
• CPC Class Codes: F05B 2270/20 to optimise the performance of a machine
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects

Abstract

A wind farm with plural wind turbines which are connectible to a farm grid that is in turn connectible to an electricity supply mains via a connection point, wherein the wind farm features the following: a central control system, which determines a correction value for a local desired value for one or plural wind turbines by way of a first regulator, depending on an actual value of an electric variable before or after the connection point, and a turbine control for at least one wind turbine, which determines a local desired value for an electric variable to be generated by the wind turbine by way of a second regulator, depending on an actual value of an electric variable measured in the farm grid, wherein the turbine control determines the sum of the local desired value and the correction value as the total desired value for the electric variable of the wind turbine to be generated.

Claims

1. A wind farm with plural wind turbines, which are connectible to a farm grid, that is in turn connectible to an electricity supply mains via a connection point, wherein the wind farm features the following a central control system (10), which determines a correction value (26, 28) for a local desired value (54) for one or plural wind turbines by way of a first regulator (12, 12B), depending on an actual value of an electric variable before or after the connection point, and a turbine control (32) for at least one wind turbine, which determines a local desired value (54) for an electric variable to be generated by the wind turbine by way of a second regulator, depending on an actual value of an electric variable measured in the farm grid, wherein the turbine control determines the sum of the local desired value (54) and the correction value (36) as the total desired value (60) for the electric variable of the wind turbine to be generated.

2. A wind farm according to claim 1, characterised in that a constant or variable desired value (14) for an electric variable to be regulated by the wind farm is applied to the first regulator (12, 12B).

3. A wind farm according to claim 1, characterised in that the first regulator (12, 12B) is realised as a regulator for voltage, power factor, reactive power or current.

4. A wind farm according to claim 1, characterised in that the first regulator (12) determines the correction value (26, 28) for a local desired value (54) of the reactive current, the reactive power, the power factor or the phase angle as the manipulated variable.

5. A wind farm according to claim 1, characterised in that the central control system (10) has a measuring unit (18), which measures an actual value of voltage (20), power factor, reactive power or current, before or after the connection point of the wind farm.

6. A wind farm according to claim 5, characterised in that the measuring unit (18) is connected to the first regulator (12) via a first data transmission medium (22).

7. A wind farm according to claim 1, characterised in that the central control system (10) has a conversion module, which converts the manipulated variable of the first regulator into correction values (36, 38) for individual wind turbines.

8. A wind farm according to claim 7, characterised in that the actual values and/or the local desired values for the electric variable of the wind turbines to be generated are applied to the conversion module.

9. A wind farm according to claim 1, characterised in that one turbine control (32) is provided for each wind turbine, and the correction value (36, 38) from the central control system (10) is applied to the turbine control.

10. A wind farm according to claim 1, characterised in that a constant desired value (52) for an electric variable measured in the farm grid by the wind turbine is applied to the second regulator (50).

11. A wind farm according to claim 1, characterised in that the second regulator (50) is realised as a regulator for voltage, power factor, reactive power or current.

12. A wind farm according to claim 1, characterised in that the second regulator (50) determines the local desired value of the reactive current, the reactive power, the power factor or the phase angle as the manipulated variable.

13. A wind farm according to claim 1, characterised in that a smoothing filter (40) is provided, which filters the correction value (36) for the local desired value before the addition (56) to the local desired value.

14. A wind farm according to claim 1, characterised in that the turbine control (32) has a third regulator (58), to which the total desired value (60) for the electric variable to be generated is applied, and which emits one or plural control signals (66) for a power section (68) of the wind turbine.

15. A wind farm according to claim 1, characterised in that the turbine control has a measuring unit (44), which measures an actual value of voltage, power factor, reactive power or current on or near the wind turbine.

16. A wind farm according to claim 15, characterised in that the measuring unit (44) of the turbine control (32) is connected to the second regulator (50) via a second data transmission medium (48).

17. A method for regulating an electric variable fed into an electricity supply mains by a wind farm having at least one wind turbine, wherein a central control system (10) determines a correction value (26, 28) for a local desired value (54) of one or plural wind turbines (31, 33) by way of a first regulator (12), depending on an actual value (24) of an electric variable, and a turbine control (32) for at least one wind turbine determines the local desired value (54) for the electric variable to be generated by way of a second regulator (50), depending on an actual value of an electric variable measured by the wind turbine, wherein the total desired value (60) for the electric variable to be generated by the wind turbine is determined as the sum of the local desired value (54) and the correction value (36).

18. A method according to claim 17, wherein the control deviation of a constant or variable desired value (14) and an actual value (24) of the electric variable in the electricity supply mains is formed in the first regulator (12).

19. A method according to claim 17, wherein the first regulator (12) determines a correction value (26;

28) for a local desired value of the reactive current, the reactive power, the power factor or the phase angle as the manipulated variable.

20. A method according to claim 17, wherein the central control system (10) converts the manipulated variable of the first regulator (12) into correction values (26, 28) for individual wind turbines.

21. A method according to claim 20, wherein the central control system (10) determines the correction variable for the wind turbines depending on the actual value and/or the local desired value (55) of the electric variable of the wind turbines.

22. A method according to claim 17, wherein a constant desired value (52) for the electric variable of the wind turbine to be regulated is applied to the second regulator (50).

23. A method according to claim 17, wherein the second regulator (50) determines the local desired value of the reactive current, the reactive power, the power factor or the phase angle as the manipulated variable (54).

24. A method according to claim 17, wherein the correction value (36) is smoothened before the addition to the local desired value (54).