Method and apparatus for controlling wind turbine power

Patent metadata

Field	Value
Publication number	US-11339762-B2
Application number	US-201816349507-A
Country	US
Kind code	B2
Filing date	May 9, 2018
Priority date	Dec 27, 2017
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A method and an apparatus for controlling wind turbine power. The method includes: determining a compensation value for target active power based on a power difference between a net grid-connected power and the target active power; determining a setpoint value of active power based on the target active power and the compensation value; and performing a current-varying control and a pitch control based on the setpoint value of active power.

First claim

The invention claimed is:

1. A method for controlling wind turbine power, comprising:
determining a compensation value, based on a power difference between a net grid-connected power and the target active power;
determining a setpoint value of active power, based on the target active power and the compensation value;
determining a current-varying setpoint value and a pitch setpoint value based on the setpoint value of active power; and
performing a current-varying control based on the current-varying setpoint value and performing a pitch control based on the pitch setpoint value,
wherein the determining a compensation value based on a power difference between a net grid-connected power and the target active power comprises:
in a case that a current pitch angle of a wind turbine is greater than a minimum pitch angle of the wind turbine and the wind turbine is at a power-generating state,
inputting the power difference between the net grid-connected power and the target active power into a proportional-integral controller, to obtain the compensation value; and,
in a case that the current pitch angle of the wind turbine is not greater than the minimum pitch angle of the wind turbine or the wind turbine is not at the power-generating state,
within a plurality of operating periods of the proportional-integral controller, determining a compensation value of a current period by decreasing a compensation value of a previous period by a preset variation, wherein for each operation period, the compensation value is greater than or equal to zero.

2. The method for controlling wind turbine power according to claim 1 , wherein inputting the power difference between the net grid-connected power and the target active power into the proportional-integral controller, to obtain the compensation value, comprises:
inputting the power difference between the net grid-connected power and the target active power into the proportional-integral controller, to obtain a first correction value through calculation; clipping amplitude of the first correction value, to obtain a second correction value; summing the compensation value of the previous period and the second correction value, to obtain a third correction value; and clipping amplitude of the third correction value, to obtain the compensation value of the current period; wherein the compensation value of the current period is not greater than a preset proportion of the net grid-connected power.

3. The method for controlling wind turbine power according to claim 2 , wherein the preset proportion is 10%.

4. A computer readable storage medium, storing a computer program, wherein the computer program when executed by a processor implements steps of the method for controlling wind turbine power according to claim 1 .

5. An apparatus for controlling wind turbine power, comprising a proportional-integral controller, a processor and a non-transitory memory storing a computer program, wherein the processor, when executing the computer program, performs the following steps:
determine a compensation value based on a power difference between a net grid-connected power and the target active power;
determine a setpoint value of active power based on the target active power and the compensation value;
determine a current-varying setpoint value and pitch setpoint value based on the setpoint value of active power; and
perform a current-varying control based on the current-varying setpoint value and perform a pitch control based on the pitch setpoint value, wherein
in a case that a current pitch angle of the wind turbine is greater than a minimum pitch angle of the wind turbine and the wind turbine is at a power-generating state,
the proportional-integral controller calculates the power difference between the inputted net grid-connected power and the inputted target active power, to obtain the compensation value,
in a case that the current pitch angle of the wind turbine is not greater than the minimum pitch angle of the wind turbine or the wind turbine is not at the power-generating state,
within a plurality of operating periods of the proportional-integral controller, the processor, when executing the computer program, determine a compensation of a current period by decreasing a compensation value of a previous period by a preset variation, wherein for each operating period, the compensation value is greater than or equal to zero.

6. The apparatus for controlling wind turbine power according to claim 5 , wherein the proportional-integral controller: calculates the power difference between the inputted net grid-connected power and the inputted target active power, to obtain a first correction value; clips amplitude of the first correction value, to obtain a second correction value; sums the compensation value of the previous period and the second correction value, to obtain a third correction value; and clips amplitude of the third correction value, to obtain the compensation value of the current period; wherein the compensation value of the current period is not greater than a preset proportion of the net grid-connected power.

7. The apparatus for controlling wind turbine power according to claim 6 , being arranged in a main controller of the wind turbine.

Assignees

• Beijing Goldwind Science & Creation Windpower Equipment Co Ltd

Inventors

• Wu Xianyou
• Xiao Shuowen

Classifications

• H02J2101/28

  Wind energy · CPC title

• F03D7/00 Primary

  Controlling wind motors  (supplying or distributing electrical power H02J, e.g. arrangements for adjusting, eliminating or compensating reactive power in networks H02J3/18; controlling electric generators H02P, e.g. arrangements for controlling electric generators for the purpose of obtaining a desired output H02P9/00) · CPC title

• H02J3/48

  Controlling the sharing of active power · CPC title

• H02J3/46

  Controlling the sharing of generated power between the generators, sources or networks · CPC title

• H02J3/381

  Dispersed generators · CPC title