WIND PARK WITH VOLTAGE REGULATION OF THE WIND ENERGY SYSTEMS AND OPERATING METHOD

• US 20100312409A1
• Filed: 09/04/2008
• Published: 12/09/2010
• Est. Priority Date: 09/19/2007
• Status: Active Grant

• Current Assignee: Siemens Gamesa Renewable Energy Service GmbH (Siemens AG)
• Original Assignee: REpower Systems AG (Senvion SE)
• Inventors: Zeumer, Jorg, Letas, Heinz-Hermann, Fortmann, Jens
• Granted Patent: US 8,373,291 B2
• Time in Patent Office: Days
• US Class Current: 700/287
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the 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 park includes at least two wind energy systems each comprising a generator and converter for generating electrical energy and a control system, a park master designed for active and idle power control that transmits a control signal for idle power via a communications network to the wind energy systems, and a connection network feeding generated electrical energy into a grid. The wind energy system can include an idle power regulator and a supplementary regulator, the control signals of each of which are linked together. Thus, a combination of idle power and voltage regulation is achieved that combines the advantages of each. Accordingly, the wind park can have high dynamic and stability notwithstanding erratic changes in the grid.

Claims

1. A wind farm having at least two wind energy installations (1), which has a generator (15) with a converter (17) for production of electrical power and has a controller (2), having a farm master (8) which is designed for real-power and wattless-component monitoring, and transmits a control signal for the wattless component via a communication network (7) to the wind energy installations (1), and having a connection grid system (3) which connects the wind energy installations (1) to one another in order to feed the electrical power produced into a grid system (9) via a junction point (69), wherein at least one of the wind energy installations (1) has a power-factor regulator (24) to whose input a wattless-component nominal value is applied and which acts on the converter (17) in order to set a wattless component which corresponds to the wattless-component nominal value, characterized in that the wind energy installation (1) has an additional regulator (4) to whose input a signal for a nominal voltage is applied, and which emits control signals for the converter (17) in order to vary the emitted wattless component, in order to regulate the emitted voltage from the wind energy installations (1) at the nominal voltage, wherein a logic unit (5) is formed, which connects the powerfactor regulator (24) and the additional regulator (4) to one another such that a common control signal is formed for the converter (17).

2. The wind farm as claimed in claim 1, characterized in that the logic unit (5) has variable weighting factors for the power-factor regulator (24) an additional regulator 4.

3. The wind farm as claimed in claim 1 or 2, characterized in that the logic unit (5) is designed such that the wattless component is varied linearly with the voltage in a voltage tolerance band.

4. The wind farm as claimed in claim 3, characterized in that the wattless component is varied non-linearly outside the limits of the voltage tolerance band.

5. The wind farm as claimed in one of claims 1 to 4, characterized in that the logic unit comprises an input filter for the wattless-power regulator (24) or the additional regulator (4).

6. The wind farm as claimed in claim 5, characterized in that the input filter has a characteristic element (43).

7. The wind farm as claimed in one of claims 1 to 6, characterized in that the power-factor regulator (24) is connected to an emergency controller (21) which produces a substitute value, which is preferably stored, when there is no control signal for the wattless component from the farm master (8).

8. The wind farm as claimed in one of claims 1 to 7, characterized in that the farm master (8) has a conversion module (82) which has an input for a farm nominal voltage and whose output acts on the wattless-component monitor (88).

9. The wind farm as claimed in claim 8, characterized in that the conversion module (82) has a reactive-current compensator.

10. The wind farm as claimed in one of claims 1 to 9, characterized in that a compensation module (80) is provided in the farm master (8) to whose input the actual voltage is applied and whose output signal acts on the wattless-component monitor (88) for compensation.

12. The wind energy installation as claimed in claim 11, characterized in that the controller is designed as claimed in one of claims 1 to 10.

11. A wind energy installation which has a generator (15) with a converter (17) for production of electrical power, and has a controller (2) with a connection for a communication network (7), via which a control signal for the wattless component is applied to the wind energy installation, and has a power-factor regulator (24) to whose input a wattless-component nominal value is applied and which acts on the converter in order to set a wattless component which corresponds to the wattless-component nominal value, characterized in that the wind energy installation has an additional regulator (4) to whose input a signal for a nominal voltage is applied, and which emits control signals for the converter (17) in order to vary the emitted wattless component, in order to regulate the emitted voltage from the wind energy installations (1) at the nominal value, and wherein a logic unit (5) is provided, which connects the power-factor regulator (24) and the additional regulator (4) to one another such that a common control signal is formed for the converter (17).

13. A method for operation of a wind farm having at least two wind energy installations (1), which has a generator (15) with a converter (17) for production of electrical power and has a controller (2), having a farm master (8) which is designed for real-power and wattless-component monitoring, and transmits a control signal for the wattless component via a communication network (7) to the wind energy installations (1), and having a connection grid system (3) which connects the wind energy installations (1) to one another in order to feed the electrical power produced into a grid system (9) via a junction point (69), wherein the wattless component is regulated at least one of the wind energy installations (1) by means of a power-factor regulator (24) to whose input a wattless-component nominal value is applied and which acts on the converter (17) in order to set a wattless component, characterized by application of a signal for a nominal voltage to the at least one wind energy installation (1), and regulation of the emitted voltage by varying the wattless component emitted from the converter (17) at the nominal voltage by means of an additional regulator (4), and linking of the power-factor regulator (24) and the additional regulator (4) such that a common control signal is formed for the converter (17).

14. The method as claimed in claim 13, characterized in that the linking is carried out by means of variable weighting factors.

15. The method as claimed in claim 13 or 14, characterized in that the linking is carried out such that the wattless component is varied linearly with the voltage in a voltage tolerance band.

16. The method as claimed in claim 15, characterized in that the wattless component is varied non-linearly outside the limits of the voltage tolerance band.

17. The method as claimed in one of claims 13 to 16, characterized in that the additional regulator has a proportional, integral and/or differential part.

18. The method as claimed in one of claims 13 to 17, characterized in that the linking is carried out by inputfiltering of the input signals for the additional regulator (4) or the power-factor regulator (24).

19. The method as claimed in claim 18, characterized by use of a characteristic element (43) for input filtering.

20. The method as claimed in one of claims 13 to 19, characterized by regulation of the voltage at the junction point (69) of the wind farm at a nominal value by means of a voltage control module (82) which acts on the wattless-component monitor.

21. The method as claimed in claim 20, characterized by use of a reactive-current compensator for the voltage control module.

22. The method as claimed in one of claims 13 to 21, characterized by production of a pilot control signal for the nominal voltage as a function of the actual emitted voltage of the wind farm, for compensation of the additional regulator.

23. The method as claimed in one of claims 13 to 22, characterized by use of an emergency controller, which preferably provides a stored substitute value, when there is no control signal for the wattless component.