A method for controlling boosted power output of a power generating unit

Patent metadata

Field	Value
Publication number	US-2022349379-A1
Application number	US-202017764758-A
Country	US
Kind code	A1
Filing date	Sep 14, 2020
Priority date	Sep 30, 2019
Publication date	Nov 3, 2022
Grant date	—

Abstract

A method for controlling a power output of a power generating unit is disclosed. An accumulated power output of the power generating unit during a predefined time interval is forecasted. An actual power output of the power generating unit is measured during the predefined time interval, and an actual accumulated power output is estimated for the predefined time interval on the basis of the measured actual power output of the power generating unit. A difference between the forecasted accumulated power output and the estimated actual accumulated power output is derived. The power output of the power generating unit is boosted, in the case that the estimated actual accumulated power output is below the forecasted accumulated power output, and the difference between the forecasted accumulated power output and the estimated actual accumulated power output is larger than a predefined threshold value.

First claim

1 . A method for controlling a power output of a power generating unit, the method comprising:
forecasting an accumulated power output of the power generating unit during a predefined time interval; measuring an actual power output of the power generating unit during the predefined time interval; estimating an actual accumulated power output for the predefined time interval on the basis of the measured actual power output of the power generating unit; deriving a difference between the forecasted accumulated power output and the estimated actual accumulated power output; and boosting the power output of the power generating unit, in the case that the estimated actual accumulated power output is below the forecasted accumulated power output, and the difference between the forecasted accumulated power output and the estimated actual accumulated power output is larger than a predefined threshold value.

2 . The method of claim 1 , wherein the power generating unit is a wind turbine generator.

3 . The method of claim 2 , wherein the forecasting an accumulated power output is based on meteorological forecasts at the position of the wind turbine generator.

4 . The method of claim 2 , wherein the boosting the power output comprises changing a pitch control strategy of the wind turbine generator.

5 . The method of claim 2 , wherein the boosting the power output comprises changing a generator control strategy.

6 . The method of claim 1 , wherein the power generating unit forms part of a renewable power plant comprising two or more renewable power generating units, the renewable power plant being coupled to a power grid.

7 . The method of claim 6 , further comprising selecting one or more renewable power generating units ( 18 , 21 ) being eligible for power boosting, and wherein the boosting the power output of the power generating unit is only performed if the power generating unit is selected as eligible for power boosting.

8 . The method of claim 1 , wherein the estimating the actual accumulated power output of the power generating unit comprises estimating an accumulated power output at the end of the predefined time interval, given that the power output remains unchanged for the remaining part of the time interval.

9 . The method of claim 1 , wherein the deriving a difference between the forecasted accumulated power output and the estimated actual power output comprises comparing an intermediate value of the forecasted accumulated power output at a specific point in time during the predefined time interval to an actual accumulated power output at the specific point in time.

10 . The method of claim 1 , further comprising repeating the steps of measuring an actual power output of the power generating unit, estimating an actual accumulated power output and deriving a difference, and wherein the method further comprises the discontinuing the boosting of the power output in the case that the difference between the forecasted accumulated power output and the estimated actual accumulated power output falls below the predefined threshold value.

11 . The method of claim 1 , further comprising:
receiving a signal indicating a need for increased supply of power to a power grid to which the power generating unit is connected; and boosting the power output of the power generating unit in response to the received signal.

12 . (canceled)

13 . (canceled)

14 . A renewable power plant, comprising:
a plurality of power generating units, coupled to a power grid, wherein each of the power generating units is adapted to provide a power output to the power grid; and a controller operable to control the power output of at least one of the power generating units according to an operation, comprising:
forecasting an accumulated power output of the power generating unit during a predefined time interval;
measuring an actual power output of the power generating unit during the predefined time interval;
estimating an actual accumulated power output for the predefined time interval on the basis of the measured actual power output of the power generating unit;
deriving a difference between the forecasted accumulated power output and the estimated actual accumulated power output; and
boosting the power output of the power generating unit, in the case that the estimated actual accumulated power output is below the forecasted accumulated power output, and the difference between the forecasted accumulated power output and the estimated actual accumulated power output is larger than a predefined threshold value.

15 . A renewable power plant according to claim 14 , wherein at least one of the power generating units is a wind turbine generator.

16 . A renewable power plant according to claim 15 , wherein the forecasting an accumulated power output is based on meteorological forecasts at the position of the wind turbine generator.

17 . A renewable power plant according to claim 15 , wherein the boosting the power output comprises changing a pitch control strategy of the wind turbine generator.

18 . A renewable power plant according to claim 15 , wherein the boosting the power output comprises changing a generator control strategy.

Assignees

• Vestas Wind Sys As

Inventors

• Kidmose Jacob Quan
• Wei Mu
• Patankar Manas

Classifications

• F05B2270/1033

  Power (if explicitly mentioned) · CPC title

• F03D7/0284 Primary

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

• F03D7/0224

  Adjusting blade pitch · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• F03D7/0276 Primary

  controlling rotor speed, e.g. variable speed · CPC title