Power reduction in a plurality of wind power plants in a wind farm

Patent metadata

Field	Value
Publication number	US-10859063-B2
Application number	US-201816028801-A
Country	US
Kind code	B2
Filing date	Jul 6, 2018
Priority date	Jul 7, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A method for operating a wind farm in a reduced-power throttle mode in which a farm master determines an individual setpoint power reduction for each participating wind power plant by determining an available power for each wind power plant, reducing this available power by a reduction proportion; determining the reduction proportions using an optimization method with the optimization condition of equal increase time for the wind power plants; and repeating until the optimization method reaches a presettable termination criterion.

First claim

The invention claimed is:

1. A method for operating a wind farm that comprises a plurality of wind power plants, each with a controller, for generating electrical power and a farm master for controlling the power output of the wind power plants, wherein the wind farm can be operated in a normal mode and a reduced-power throttle mode, the method comprising, in the throttle mode:
receiving at the farm master a signal for a power reduction of the wind farm ΔP set,farm ;
determining an individual setpoint power reduction P set,i for each participating wind power plant of the plurality of wind power plants, wherein determining the individual setpoint power reduction comprises:
determining an available power P avail(i) for each of the participating wind power plants,
determining a power reduction proportion ΔP i for each participating wind power plant using an optimization method that is based on an optimization condition of equal power increase time T regain, opt =T regain, i for all of the participating wind power plants, wherein the determination of the power reduction proportion is repeated until the optimization method meets a presettable termination criterion, and
subtracting the power reduction proportion ΔP i for a respective participating wind power plant from the available power P avail(i) for the respective participating wind power plant; and

providing the individual setpoint power reduction P set,i to each participating wind power plant for throttling each participating wind power plant.

2. The method of claim 1 , wherein the optimization method is carried out incompletely over a fixed period.

3. The method of claim 2 , wherein the period is a time period.

4. The method of claim 2 , wherein the period is a number of repetitions.

5. The method of claim 2 , wherein the optimization method is executed incrementally, starting from the result of an optimization method that was executed last.

6. The method of claim 1 , wherein the optimization method comprises enforcing a secondary condition even in the case of incomplete optimization.

7. The method of claim 6 , wherein the enforcement is executed by a correction factor.

8. The method of claim 6 , wherein the secondary condition comprises a sum of the reduction proportions ΔP i .

9. The method of claim 8 , wherein the secondary condition comprises the sum of the reduction proportions being equal to the power reduction of the wind farm.

10. The method of claim 1 , wherein the determination of the individual setpoint power reduction P set,i for each participating wind power plant is based on a minimum power of each participating wind power plant.

11. The method of claim 1 , wherein at least one wind power plant of the plurality of wind power plants are excluded from throttling.

12. The method of claim 11 , wherein the at least one wind power plant that is excluded has available power that is below a settable threshold.

13. The method of claim 1 , wherein the optimization method uses a polynomial function for the increase time of the participating wind power plants that is stored at the farm master.

14. The method of claim 1 , wherein the optimization method uses a multidimensional characteristic map function for the increase time of the participating wind power plants that is stored at the farm master.

15. The method of claim 1 , comprising locally calculating an increase time at each participating wind power plant and transmitting the increase time from each participating wind power plant to a central unit for the optimization method.

16. The method of claim 1 , wherein execution of the optimization method is at least partially decentralized.

17. A wind farm operable in a normal mode and a reduced-power throttle mode, the wind farm comprising:
a plurality of wind power plants, each with a controller, for generating electrical power; and
a farm master for controlling the power output of the wind power plants, wherein the farm master is configured to, in the throttle mode:
receive at the farm master a signal for a power reduction of the wind farm ΔP set,farm ;
determine an individual setpoint power reduction P set,i for each participating wind power plant of the plurality of wind power plants, wherein determining the individual setpoint power reduction comprises:
determining an available power P avail(i) for each of the participating wind power plants,
determining a power reduction proportion ΔP i for each participating wind power plant using an optimization method that is based on an optimization condition of equal power increase time T regain, opt =T regain, i for all of the participating wind power plants, wherein the determination of the power reduction proportion is repeated until the optimization method meets a presettable termination criterion, and
subtracting the power reduction proportion ΔP i for a respective participating wind power plant from the available power P avail(i) for the respective participating wind power plant; and

provide the individual setpoint power reduction P set,i to each participating wind power plant for throttling each participating wind power plant.

Assignees

• Senvion Gmbh

Inventors

• Geisler Jens

Classifications

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• F03D7/0284 Primary

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

• F05D2270/20

  to optimize the performance of a machine · CPC title

• F05D2270/335

  Output power or torque · CPC title

• F05B2270/335

  Output power or torque · CPC title