Application US20200003181

METHOD FOR REBUILDING AN ELECTRIC SUPPLY GRID
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US20200003181

1. A method for rebuilding an electric supply grid by at least one wind power installation, wherein the electric supply grid includes a first grid section and a second grid section, wherein: (10) (3)

the first grid section is coupled to the at least one wind power installation and has a first grid nominal voltage,

the first grid section is coupled to the second grid section via at least one switching device in order to transmit electric energy between the first and second grid sections, and

the at least one switching device is configured to disconnect the first grid section from the second grid section in the event of a fault, the method comprising: operating the at least one wind power installation in an observation mode if the fault occurs, wherein the at least one wind power installation does not feed into the first grid section in the observation mode and a status of the first grid section is checked;

operating the at least one wind power installation in a grid rebuilding mode if the first grid section has a grid rebuilding voltage; and

operating the at least one wind power installation in a normal operating mode after the fault has passed.

2. The method for rebuilding an electric supply grid as claimed in claim 1, wherein the fault occurs in response to at least one of: (0) (3)

3. The method for rebuilding an electric supply grid as claimed in claim 1, wherein the fault is determined by at least one of: (0) (2)

4. The method for rebuilding an electric supply grid as claimed in claim 1, comprising determining the fault has passed by at least one of: (2) (4)

a message from a grid operator;

capturing a grid voltage of the first grid section, wherein the captured grid voltage is greater than 70% of the first grid nominal voltage for a predetermined minimum period of time;

capturing a frequency stability, wherein the frequency stability is present if the grid frequency is within a tolerance band for a predetermined period of time, wherein the tolerance band has an upper limit and a lower limit wherein the upper limit is above a grid nominal frequency and the lower limit is below the grid nominal frequency; or

a grid detection unit configured to excite the electric supply grid and to observe the first grid section in order to determine a size of the first grid section.

18. The method for rebuilding an electric supply grid as claimed in claim 4, wherein the captured grid voltage is greater than 90% of the first grid nominal voltage for a predetermined minimum period of time. (0)

19. The method for rebuilding an electric supply grid as claimed in claim 4, wherein the upper limit is 51 Hz and the lower limit is 49 Hz and the grid nominal frequency is 50 Hz. (0)

5. The method for rebuilding an electric supply grid as claimed in claim 1, wherein the grid rebuilding mode comprises synchronization operation in which the wind power installation is synchronized with the grid voltage of the first grid section, when the grid voltage is substantially stable. (0)

6. The method for rebuilding an electric supply grid as claimed in claim 1, wherein the grid rebuilding mode comprises a power control process during which the at least one wind power installation feeds an electric power into the first grid section on the basis of a desired power value, wherein the desired power value is specified by a grid operator and increases the electric power in such a manner that the electric power is slowly tracked in the case of a remaining system deviation. (1) (0)

8. The method for rebuilding an electric supply grid as claimed in claim 1, further comprising operating the at least one wind power installation such that the at least one wind power installation retains a predetermined portion of its nominal power as controlling power. (1) (0)

9. The method for rebuilding an electric supply grid as claimed in claim 1, further comprising: (2) (1)

capturing a weather forecast for the grid rebuilding mode for determining a minimum power of the at least one wind power installation, wherein the weather forecast: is determined by the at least one wind power installation itself; or

is requested by the at least one wind power installation from a grid operator.

10. The method for rebuilding an electric supply grid as claimed in claim 9, further comprising: (0) (1)

11. The method for rebuilding an electric supply grid as claimed in claim 9, further comprising: (0) (1)

12. The method for rebuilding an electric supply grid as claimed in claim 1, further comprising: (2) (1)

providing the first grid section with a voltage synchronized with the grid voltage by the at least one wind power installation.

13. The method for rebuilding an electric supply grid as claimed in claim 12, wherein the first grid section is provided with the voltage using a voltage stabilization process which is performed based on a desired voltage specification to provide the first grid section with a substantially stable voltage. (1) (0)

21. The method for rebuilding an electric supply grid as claimed in claim 12, wherein providing the first grid section with the voltage synchronized with the grid voltage by the at least one wind power installation is based on at least one of: a weather forecast or a desired voltage specification of the grid operator. (0)

14. A method for rebuilding an electric supply grid by means of a wind farm comprising a plurality of wind power installations, wherein the plurality of wind power installations are configured to carry out the method as claimed in claim 1, wherein the wind farm has at least a nominal power of between 4 MW and 400 MW and is coupled to the first grid section. (1) (0)

16. A wind power installation comprising a controller for controlling the wind power installation, wherein the controller is configured to carry out the method as claimed in claim 1. (1) (0)

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Application US20200003181

METHOD FOR REBUILDING AN ELECTRIC SUPPLY GRID

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