Wind park with voltage regulation of the wind energy systems and operating method

• US 8,373,291 B2
• Filed: 09/04/2008
• Issued: 02/12/2013
• 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
• Primary Examiner(s): TA, THO DAC
• Application Number:
  US12/679,206
• Publication Number:
  US 20100312409A1
• Time in Patent Office: 1,622 Days
• Field of Search: 290/44, 290/55
• US Class Current: 290/44
• 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 and operating method thereof. The 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 comprising:

at least two wind energy installations, each comprising a generator with a converter for production of electrical power and a controller;

a farm master configured to provide real-power and wattless-component monitoring and configured to transmit a control signal for a wattless component via a communication network to the wind energy installations; and

a connection grid system configured to connect the wind energy installations to one another to feed produced electrical power into a grid system via a junction point,

wherein the controller comprises (i) a power-factor regulator to whose input a wattless-component nominal value is applied and which acts on the converter to set a wattless component which corresponds to the wattless-component nominal value, (ii) an additional regulator to whose input a signal for a nominal voltage is applied and which emits control signals for the converter to vary the emitted wattless component in order to regulate emitted voltage from the wind energy installations at the nominal voltage, and (iii) a logic unit configured to connect the power-factor regulator and the additional regulator such that a common control signal is formed for the converter.

2. The wind farm of claim 1, wherein the logic unit has variable weighting factors for the power-factor regulator and the additional regulator.

3. The wind farm of claim 1, wherein the logic unit is designed such that the wattless component is varied linearly with the voltage in a voltage tolerance band and is varied non-linearly outside the limits of the voltage tolerance band.

4. The wind farm of claim 1, wherein the logic unit comprises an input filter having a characteristic element for the power-factor regulator or the additional regulator.

5. The wind farm of claim 1, wherein the farm master comprises a conversion module which has an input for a farm nominal voltage and whose output acts on a wattless-component monitor.

6. The wind farm of claim 1, further comprising a compensation module provided in the farm master to whose input the actual voltage is applied and whose output signal acts on a wattless-component monitor for compensation.

7. A wind energy installation designed as claimed in one of claims 1 to 6.

8. The wind farm of claim 1, wherein the power-factor regulator is connected to an emergency controller which produces a substitute value when there is no control signal for the wattless component from the farm master.

9. The wind farm of claim 8, wherein the substitute value is stored.

10. A wind energy installation comprising:

a generator with a converter for production of electrical power;

a controller with a connection for a communication network via which a control signal for a wattless component is applied to the wind energy installation;

wherein the controller comprises

a power-factor regulator to whose input a wattless-component nominal value is applied and which acts on the converter to set the wattless component which corresponds to the wattless-component nominal value;

an additional regulator to whose input a signal for a nominal voltage is applied and which emits control signals for the converter to vary the emitted wattless component in order to regulate the emitted voltage from the wind energy installation at the nominal value; and

a logic unit which connects the power-factor regulator and the additional regulator such that a common control signal is formed for the converter.

11. A method for operation of a wind farm, the wind farm comprising (i) at least two wind energy installations, each having a generator with a converter for production of electrical power and a controller, (ii), a farm master designed for real-power and wattless-component monitoring and configured to transmit a control signal for a wattless component via a communication network to the wind energy installations, and (iii) a connection grid system which connects the wind energy installations to feed the produced electrical power into a grid system via a junction point, the method comprising:

regulating the wattless component at at least one of the wind energy installations by a power-factor regulator of the controller to whose input a wattless-component nominal value is applied and which acts on the converter to set the wattless component;

applying a signal for a nominal voltage to the at least one wind energy installation;

regulating the emitted voltage by varying the wattless component emitted from the converter at the nominal voltage by an additional regulator of the controller; and

linking the power-factor regulator and the additional regulator such that a common control signal is formed for the converter.

12. The method of claim 11, wherein the linking is carried out by variable weighting factors.

13. The method of claim 11, wherein the linking is carried out such that the wattless component is varied linearly with the voltage in a voltage tolerance band and is varied non-linearly outside the limits of the voltage tolerance band.

14. The method of claim 11, further comprising regulating the voltage at the junction point of the wind farm at a nominal value by a voltage control module which acts on a wattless-component monitor.

15. The method of claim 11, further comprising producing 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.

16. The method of claim 11, wherein the linking is carried out by input filtering of the input signals for the additional regulator or the power-factor regulator.

17. The method of claim 16, wherein a characteristic element is used for input filtering.