Method for providing a requested real power

Patent metadata

Field	Value
Publication number	US-11952982-B2
Application number	US-202017103589-A
Country	US
Kind code	B2
Filing date	Nov 24, 2020
Priority date	Nov 27, 2019
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A method for providing a requested real power including receiving the requested real power at a transmission feed-in point; using a real power band with an upper band limit and a lower band limit, each of which is disposed with an offset from the requested real power. The real power band furthermore comprises at least one control threshold value between the upper band limit and the lower band limit. The method includes controlling at least one regenerative energy generator depending on the at least one control threshold value, in particular in order to provide the requested real power as transmission power at the transmission feed-in point.

First claim

The invention claimed is:

1. A method for providing a requested real power as a transmission power at a transmission feed-in point of an electrical supply grid that electrically connects a first voltage segment to a second voltage segment, wherein the second voltage segment includes at least one regenerative energy generator, the method comprising:
receiving the requested real power that is requested at the transmission feed-in point; and
controlling the transmission power at the transmission feed-in point using a real power band, the real power band having:
an upper band limit and a lower band limit each being at a respective offset from the requested real power, and
at least one control threshold value between the upper band limit and the lower band limit;

wherein controlling the transmission power at the transmission feed-in point includes controlling the at least one regenerative energy generator depending on whether the at least one control threshold value has been reached or exceeded to provide the requested real power as the transmission power at the transmission feed-in point.

2. The method as claimed in claim 1 , wherein:
the first voltage segment of the electrical supply grid has a first nominal voltage,
the second voltage segment of the electrical supply grid has a second nominal voltage, and
the first nominal voltage is greater than the second nominal voltage, wherein the first nominal voltage is at least 110 kilovolts (kV) and the second nominal voltage is at least 10 kV.

3. The method as claimed in claim 1 , wherein a transformer is arranged at the transmission feed-in point, wherein the transformer is configured to electrically connect the first voltage segment and the second voltage segment.

4. The method as claimed in claim 1 , comprising:
receiving the real power band from a transmission grid operator.

5. The method as claimed in claim 1 , comprising:
measuring, by a distribution grid operator, the transmission power at the transmission feed-in point; and
controlling the at least one regenerative energy generator depending on the measured transmission power.

6. The method as claimed in claim 1 , wherein the respective offsets of the upper band limit and the lower band limit from the requested real power are relative offsets relative to the requested real power.

7. The method as claimed in claim 1 , wherein the respective offsets of the upper band limit and the lower band limit are each associated with a minimum offset in relation to the requested real power, wherein each minimum offset is at least 5 megawatts (MW).

8. The method as claimed in claim 1 , wherein the respective offset of the upper band limit is a predefined positive offset from the requested real power in a range of:
40% to 60% of the requested real power; or
60% to 80% of the requested real power.

9. The method as claimed in claim 1 , wherein the respective offset of the lower band limit is a predefined negative offset from the requested real power in a range of:
40% to 60% of the requested real power; or
60% to 80% of the requested real power.

10. The method as claimed in claim 1 , wherein the real power band has a real power bandwidth that is predefinable, wherein the real power bandwidth is a sum of magnitudes of the respective offsets of the upper band limit and the lower band limit from the requested real power, and wherein the real power bandwidth is at least 10 MW.

11. The method as claimed in claim 1 , comprising:
changing the real power band during operation by performing at least one change from a list of changes including:
an increase or reduction of a real power bandwidth;
a change in the respective offset of the upper band limit;
a change in the respective offset of the lower band limit; and
a shift of the real power band by an offset factor depending on at least one of a list of dependencies including:
a reception of an external change signal;
a stability parameter of the electrical supply grid, wherein the stability parameter expresses a strength in a reaction of the electrical supply grid to a change of a parameter that has an influence on the first voltage segment or the second voltage segment;
a number of regenerative energy generators coupled to the second voltage segment;
a total installed power in the first voltage segment and/or in the second voltage segment of the electrical supply grid;
a total synchronous inertia in the first voltage segment and/or in the second voltage segment of the electrical supply grid; and
a number and size of loads that are to be switched into the second voltage segment.

12. The method as claimed in claim 1 , further comprising:
triggering an increase in a real power of the at least one regenerative energy generator that is fed in when an upper threshold value of the requested real power is reached.

13. The method as claimed in claim 1 , further comprising:
triggering a reduction in a real power of the at least one regenerative energy generator that is fed in when a lower threshold value of the requested real power is reached.

14. The method as claimed in claim 1 , wherein:
the at least one control threshold value is a threshold value associated with a predefined value between the requested real power and the lower band limit.

15. The method as claimed in claim 12 , comprising:
when the at least one control threshold value is reached, generating a feed signal depending on the at least one control threshold value, and wherein the feed signal is configured for the at least one regenerative energy generator for controlling a real power feed of the at least one regenerative energy generator, and/or
when the at least one control threshold value is reached, generating a switch-in signal depending on the at least one control threshold value, and wherein the switch-in signal is configured for the at least one regenerative energy generator, and the at least one regenerative energy generator is switched into the second voltage segment or out of the second voltage segment to control real power generation.

16. The method as claimed in claim 1 , comprising:
specifying, by a grid operator, the requested real power;
specifying, by a transmission grid operator of the first voltage segment, the requested real power as a real power setpoint value;
specifying, by the transmission grid operator of the first voltage segment, the requested real power as the real power setpoint value that is constant over time or follows a ramp curve; or
specifying, by the transmission grid operator of the first voltage segment, the real power band, the upper band limit, the lower band limit or the at least one control threshold value.

17. The method as claimed in claim 1 , comprising:
changing the at least one control threshold value during operation by performing at least one change from a list of changes including:
an increase or reduction of an upper threshold value;
an increase or reduction of a lower threshold value; and
an increase or reduction of a constant threshold value; or

changing the at least one control threshold value during operation depending on at least one of a list of dependencies including:
a reception of an external change signal;
a stability parameter of the electrical supply grid, wherein the stability parameter expresses a strength in a reaction of the electrical supply grid to a change of a parameter that has an influence on the first voltage segment or the second voltage segment;
a number of regenerative energy generators coupled to the second voltage segment;
a total installed power in

Assignees

• Wobben Properties Gmbh

Inventors

• Brombach Johannes

Classifications

• H02J2101/28

  Wind energy · CPC title

• F03D7/0284 Primary

  in relation to the state of the electric grid · CPC title

• F03D9/257

  the wind motor being part of a wind farm · CPC title

• H02J3/381

  Dispersed generators · CPC title

• F05B2270/337

  Electrical grid status parameters, e.g. voltage, frequency or power demand · CPC title