Wind energy plant testing device

1. A wind energy installation test device for defined production of grid system faults, comprising:

an output configured to connect to a wind energy installation;

an input configured to connect to a grid system; and

a switching device for connection of an electrical disturbance component relating to a grid system parameter,

wherein an autotransformer having a phase-displacement winding is used for the electrical disturbance component, the grid system in a sound state being connected to a connection of a primary winding and the grid system in a disturbed state with respect to the grid system parameter being output at a connection of a secondary winding, wherein the autotransformer uses portions of the same winding for both the primary winding and the secondary winding.

2. The wind energy installation test device of claim 1 , wherein the phase-displacement winding is additional to the primary winding and the secondary winding.

3. The wind energy installation test device of claim 2 , wherein the phase-displacement winding is configured to be switchable.

4. The wind energy installation test device-of claim 2 , wherein the phase-displacement winding is provided with a plurality of taps.

5. The wind energy installation test device of claim 2 , wherein the phase-displacement winding is configured to produce an electrical angle between the phases of 50° to 60°.

6. The wind energy installation test device of claim 2 , wherein the phase-displacement winding is configured to produce an electrical angle of 53°.

7. The wind energy installation test device of claim 1 , wherein at least one of the primary winding and the secondary winding is provided with a plurality of taps.

8. The wind energy installation test device of claim 1 , wherein the autotransformer comprises an autotransformer/phase-displacement transformer having an integrated phase-displacement winding.

9. The wind energy installation test device of claim 1 , wherein the switching device comprises double switches which are connected in series in order to produce short switching times.

10. The wind energy installation test device of claim 1 , wherein the switching device comprises electronic switches.

11. The wind energy installation test device of claim 1 , further comprising a multi-switching unit configured to switch the electrical disturbance component between an overvoltage and an undervoltage operating mode.

12. The wind energy installation test device of claim 1 , wherein the autotransformer comprises a plurality of parallel transformers which can be activated individually.

13. A method for testing a wind energy installation, comprising:

(a) connecting an autotransformer having a phase-displacement winding with the connection between a distribution grid system and a wind energy installation, the connection having a first transformation ratio;

(b) switching the autotransformer to a different transformation ratio with a higher secondary voltage for a predefined time; and

(c) switching the autotransformer back to the first transformation ratio.

14. The method of claim 13 , wherein step (b) is carried out with at least one of different transformation ratios and different transformers.

15. The method of claim 13 , wherein step (b) is carried out with different phase-displacement angles.

16. The method of claim 13 , wherein the autotransformer is connected in series with the connection between the distribution grid system and the wind energy installation.

17. The method of claim 13 , wherein the autotransformer is connected in parallel with the connection between the distribution grid system and the wind energy installation.

18. The method of claim 13 , wherein the first transformation ratio is 1:1.