WIND TURBINES HAVING CONTROL FOR NETWORK FAULTS AND OPERATING METHOD THEREOF

• US 20100276930A1
• Filed: 10/09/2008
• Published: 11/04/2010
• Est. Priority Date: 10/12/2007
• Status: Active Grant

• Current Assignee: Siemens Gamesa Renewable Energy Service GmbH (Siemens AG)
• Original Assignee: REpower Systems AG (Senvion SE)
• Inventors: Fortmann, Jens
• Granted Patent: US 8,378,515 B2
• Time in Patent Office: Days
• US Class Current: 290/44
• CPC Class Codes: F03D 9/255 connected to electrical distribution networks; Arrangements therefor
• CPC Class Codes: F03D 9/257 the wind motor being part of a wind farm
• CPC Class Codes: F05B 2270/337 Electrical grid status parameters, e.g. voltage, frequency or power demand
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/40 Synchronising a generator for connection to a network or to another generator
• 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 network disturbance module for a control device of a wind energy installation having a generator driven by a wind rotor and a converter for producing electrical power fed into a network. The module includes a measurement device configured to measure at least one electrical parameter of the network, a detector configured to identify a network disturbance and output a switching signal, and a reference generator configured to produce a substitute reference vector for the converter based on the at least one electrical parameter. The module also includes a fault management unit comprising a fault classifier, the unit being configured to interact with the measurement device, detector, and reference generator such that, in the event of an undervoltage during island operation, a quick-action frequency regulator is activated. The regulator acts on the converter to vary a real-power feed P in the event of a discrepancy in a network frequency.

Claims

1. A network disturbance module for a control device of a wind energy installation having a generator driven by a wind rotor a converter for producing electrical power, which is fed into a network, the network disturbance module comprising:

a measurement device configured to measure at least one electrical parameter of the network;

a detector configured to identify a network disturbance and output a switching signal;

a reference generator configured to produce a substitute reference vector for the converter based on the at least one electrical parameter; and

a fault management unit comprising a fault classifier and configured to interact with the measurement device, detector, and reference generator such that, in the event of an undervoltage during island operation, a quick-action frequency regulator is activated, which acts on the converter to vary a real-power feed P in the event of a discrepancy in a network frequency.

2. The network disturbance module of claim 1, wherein the fault management unit is configured to interact with a voltage regulator in such a way as to regulate network voltage in the event of a change in a reactive power Q during island operation.

3. The network disturbance module of claim 1, wherein the fault management unit is configured to apply the substitute reference vector to the converter in the event of a short circuit.

4. The network disturbance module of claim 1, wherein the fault management unit comprises a time module and the fault classifier is configured to interact with the time module such that, in the event of a persistent short circuit, no more power is fed into the network after a first time period, in the event of a persistent under voltage, no more power is newly fed into the network after a second time period and, during island operation, no more power is fed into the network after a third time period.

9. The network disturbance module of claim 1, wherein the fault management unit has an input channel (CMD), via which at least one of a frequency and a phase angle are predetermined during island operation, and an output channel (OUT) via which the reference vector is output during island operation.

12. The network disturbance module of claim 1, wherein the quick-action frequency regulator is configured to act on a load comprising one of a controllable resistance and a chopper.

15. The network disturbance module of claim 1, wherein the fault management unit comprises a transit module having a ramp function and configured to, at an end of island operation, return the signal applied to the converter for the real power to a preset value, the preset value being the original value before the occurrence of the network fault or a currently demanded value.

18. The network disturbance module of claim 1, further comprising a network following unit configured to limit a difference angle.

20. The network disturbance module of claim 1, further comprising a synchronization module connected to the fault management unit and to the frequency regulator and configured to interact in such a way as to match the substitute reference vector to an external point.

21. The network disturbance module of claim 20, wherein the synchronization module comprises a communication unit and is configured to interact with a time reference to provide the substitute reference vector with a time stamp.

23. A wind farm comprising a farm master and a plurality of wind energy installations, each wind energy installation having a generator, driven by a wind rotor and a converter for producing electrical power which is fed into a network, wherein the farm master comprises the network disturbance module of claim 1.

5-8. -8. (canceled)

10-11. -11. (canceled)

13-14. -14. (canceled)

16-17. -17. (canceled)

19. (canceled)

22. (canceled)

24. (canceled)

25. A method for operating a wind energy installation having a generator, driven by a wind rotor and a converter for producing electrical power which is fed into a network, comprising:

measuring an electrical parameter of the network;

detecting island network formation with the output of a switching signal;

generating a reference value as a reference vector based on the measured parameter for the converter,

classifying a fault on identification of the switching signal; and

in the event of an under voltage during island operation, carrying out quick-action frequency regulation, in which the frequency of the network is regulated by means of the converter by varying a real power P.

26. The method of claim 25, wherein a network disturbance module performs the steps of the method.

27. The method of claim 26, operation of wherein a synchronization module synchronizes the wind energy installation with a farm master or with another wind energy installation.

30. The method of claim 27, wherein farm-external preset values are received, and used for synchronization.

28-29. -29. (canceled)