Controller, wind park and control method

Patent metadata

Field	Value
Publication number	US-9257843-B2
Application number	US-201213534256-A
Country	US
Kind code	B2
Filing date	Jun 27, 2012
Priority date	Jun 29, 2011
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

Described is a controller, wherein the controller is adapted: to control a transformation ratio of a park transformer of a wind turbine park including wind turbines connected to a first node. The park transformer is connected between a first node and a second node which is connected to a utility grid to which electric energy produced by the wind turbines is to be delivered. Further a wind park and a control method are described.

First claim

The invention claimed is:

1. A controller,
wherein the controller is adapted to control a transformation ratio of a park transformer of a wind turbine park comprising a plurality of wind turbines connected to a first node, wherein the park transformer is connected between the first node and a second node which is connected to a utility grid to which electric energy produced by the wind turbines is to be delivered;
wherein the controller is further adapted to control at least one impedance element connected to the second node or between the park transformer and a wind turbine transformer of at least one wind turbine; and
wherein the impedance element comprises an inductor.

2. The controller according to claim 1 ,
wherein the impedance element comprises a capacitor.

3. The controller according to claim 2 ,
wherein the controller is adapted to adjust an impedance of the capacitor to generate reactive power.

4. The controller according to claim 1 ,
wherein the controller is adapted to adjust an impedance of the inductor to absorb reactive power.

5. The controller according to claim 1 ,
wherein the controller is adapted to control the transformation ratio and/or an impedance of the impedance element based on a measured electrical property at the first node and/or at the second node.

6. The controller according to claim 1 ,
wherein the controller is adapted to control an impedance of the impedance element such that an amplitude and/or a phase of an impedance of the wind turbine park is altered.

7. The controller according to claim 1 ,
wherein the controller is adapted to control the transformation ratio and/or an impedance of the impedance element such that a power loss occurring between a wind turbine transformer of at least one of the plurality of wind turbines and the park transformer and reduced.

8. A controller,
wherein the controller is adapted to control a transformation ratio of a park transformer of a wind turbine park comprising a plurality of wind turbines connected to a first node, wherein the park transformer is connected between the first node and a second node which is connected to a utility grid to which electric energy produced by the wind turbines is to be delivered;
wherein the controller is further adapted to control at least one impedance element connected to the second node or between the park transformer and a wind turbine transformer of at least one wind turbine; and
wherein the controller is adapted to control the impedance of the impedance element such that the amplitude of the impedance of the wind turbine park at a predetermined frequency is reduced.

9. The controller according to claim 8 ,
wherein the impedance element comprises a capacitor

10. The controller according to claim 8 ,
wherein the controller is adapted to adjust an impedance of the capacitor to generate reactive power.

11. The controller according to claim 8 ,
wherein the controller is adapted to control the transformation ratio and/or an impedance of the impedance element based on a measured electrical property at the first node and/or at the second node.

12. The controller according to claim 8 ,
wherein the controller is adapted to control an impedance of the impedance element such that an amplitude and/or a phase of an impedance of the wind turbine park is altered.

13. The controller according to claim 8 ,
wherein the controller is adapted to control the transformation ratio and/or an impedance of the impedance element such that a power loss occurring between a wind turbine transformer of at least one of the plurality of wind turbines and the park transformer is reduced.

14. A controller,
wherein the controller is adapted to control a transformation ratio of a park transformer of a wind turbine park comprising a plurality of wind turbines connected to a first node, wherein the park transformer is connected between the first node and a second node which is connected to a utility grid to which electric energy produced by the wind turbines is to be delivered;
wherein the controller is further adapted to control at least one impedance element connected to the second node or between the park transformer and a wind turbine transformer of at least one wind turbine; and
wherein the controller is adapted to control the transformation ratio and/or the impedance of the impedance element based on a model of the wind park to reduce the power loss.

15. The controller according to claim 14 ,
wherein the impedance element comprises a capacitor

16. The controller according to claim 14 ,
wherein the controller is adapted to adjust an impedance of the capacitor to generate reactive power.

17. The controller according to claim 14 ,
wherein the controller is adapted to control the transformation ratio and/or an impedance of the impedance element based on a measured electrical property at the first node and/or at the second node.

18. The controller according to claim 14 ,
wherein the controller is adapted to control an impedance of the impedance element such that an amplitude and/or a phase of an impedance of the wind turbine park is altered.

19. The controller according to claim 14 ,
wherein the controller is adapted to control the transformation ratio and/or an impedance of the impedance element such that a power loss occurring between a wind turbine transformer of at least one of the plurality of wind turbines and the park transformer is reduced.

Assignees

• Egedal Per
• Kumar Sathees
• Nielsen Kaj Skov
• Siemens Ag

Inventors

• Egedal Per
• Kumar Sathees
• Nielsen Kaj Skov

Classifications

• G05F1/70

  Regulating power factor; Regulating reactive current or power · CPC title

• H02J3/16 Primary

  by adjustment of reactive power · CPC title

• H02J3/1828

  with stepwise control, e.g. switched capacitor banks · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J3/386

  Electricity · mapped topic