Controller for wind turbine, wind turbine, program for rotor turning, and method of rotor turning for wind turbine

Patent metadata

Field	Value
Publication number	US-10697429-B2
Application number	US-201615393819-A
Country	US
Kind code	B2
Filing date	Dec 29, 2016
Priority date	Jan 29, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A controller of a wind turbine for causing the wind turbine to perform rotor turning includes: an input part for receiving a target azimuth angle at which a rotor of the wind turbine is to be stopped; and a pitch control part configured to cause the wind turbine to perform a pitch control to stop the rotor at the target azimuth angle. The pitch control part is configured to: control a pitch angle of a wind turbine blade of the wind turbine so that the rotor rotates at a predetermined rotation speed which is constant, in a first period until the rotor reaches a control-switch azimuth angle immediately before the target azimuth angle; and control the pitch angle so that a rotation speed of the rotor decreases from the predetermined rotation speed in a second period after the rotor reaches the control-switch azimuth angle and before the rotor reaches the target azimuth angle.

First claim

The invention claimed is:

1. A controller of a wind turbine for causing the wind turbine to perform rotor turning, comprising:
an input part to which a target azimuth angle at which a rotor of the wind turbine is to be stopped is inputted; and
a pitch control part for performing a pitch control to stop the rotor at the target azimuth angle,
wherein the pitch control part is configured to:
control a pitch angle of a wind turbine blade of the wind turbine so that the rotor rotates at a predetermined rotation speed which is constant, in a first period until the rotor reaches a control-switch azimuth angle immediately before the target azimuth angle; and
control the pitch angle so that a rotation speed of the rotor decreases from the predetermined rotation speed in a second period after the rotor reaches the control-switch azimuth angle and before the rotor reaches the target azimuth angle,
wherein, during the second period, a brake of the wind turbine is deactivated and is activated upon reaching the target azimuth angle, and
the controller further comprises a calculation part for calculating the control-switch azimuth angle on a basis of at least one of the pitch angle in the first period or a wind-velocity in the first period.

2. The controller of a wind turbine according to claim 1 ,
wherein the pitch control part is configured to retrieve the control-switch azimuth angle from a memory storing the control-switch azimuth angle in advance.

3. The controller of a wind turbine according to claim 1 ,
wherein the pitch control part is configured to change the pitch angle to a feather side at a constant rate in at least a part of the second period.

4. The controller of a wind turbine according to claim 1 ,
wherein the pitch control part is configured to reduce the rotation speed of the rotor at a constant rate in at least a part of the second period.

5. The controller of a wind turbine according to claim 1 ,
wherein the predetermined rotation speed is not less than 0.05 rpm and not more than 1.0 rpm.

6. The controller of a wind turbine according to claim 1 , further comprising
a brake control part configured to operate a brake for braking the rotor when the rotor reaches the target azimuth angle.

7. The controller of a wind turbine according to claim 1 , further comprising
a yaw control part for performing a following control on a yaw direction of the rotor in accordance with a wind direction when the pitch angle is controlled in the first period and the second period.

8. A wind turbine, comprising:
a rotor; and
the controller according to claim 1 for performing a rotor-turning operation so that the rotor stops at the target azimuth angle.

9. The controller of a wind turbine according to claim 1 ,
wherein the brake of the wind turbine is activated upon reaching the target azimuth angle to complete a rotor turning for maintenance of the wind turbine.

10. A program for rotor turning for a controller of a wind turbine for causing the wind turbine to perform rotor turning, the controller comprising:
an input part to which a target azimuth angle at which a rotor of the wind turbine is to be stopped is inputted; and
a pitch control part for performing a pitch control to stop the rotor at the target azimuth angle,
the program being configured to cause the controller to perform:
a step of controlling a pitch angle of the wind turbine blade of the wind turbine so that the rotor rotates at a predetermined rotation speed which is constant, in a first period until the rotor reaches a control-switch azimuth angle immediately before the target azimuth angle; and
a step of controlling the pitch angle so that a rotation speed of the rotor decreases from the predetermined rotation speed in a second period after the rotor reaches the control-switch azimuth angle and before the rotor reaches the target azimuth angle,
wherein, during the second period, a brake of the wind turbine is deactivated and is activated upon reaching the target azimuth angle, and
the program being configured to cause the controller to perform a step of calculating the control-switch azimuth angle on a basis of at least one of the pitch angle in the first period or a wind velocity in the first period.

11. A method of rotor turning for a wind turbine, comprising,
a stop step of causing the wind turbine to perform a pitch control to stop a rotor of the wind turbine at a target azimuth angle,
wherein the stop step further comprises:
controlling a pitch angle of a wind turbine blade of the wind turbine so that the rotor rotates at a predetermined rotation speed which is constant, in a first period until the rotor reaches a control-switch azimuth angle immediately before the target azimuth angle; and
controlling the pitch angle so that a rotation speed of the rotor decreases from the predetermined rotation speed in a second period after the rotor reaches the control-switch azimuth angle and before the rotor reaches the target azimuth angle, and
wherein, during the second period, a brake of the wind turbine is deactivated and is activated upon reaching the target azimuth angle, and
the method further comprises a step of calculating the control-switch azimuth angle on a basis of at least one of the pitch angle in the first period or a wind velocity in the first period.

12. The method of rotor turning according to claim 11 ,
wherein, in the stop step, the pitch angle is changed to a feather side at a constant rate in at least a part of the second period.

13. The method of rotor turning according to claim 11 ,
wherein, in the stop step, the rotation speed of the rotor is reduced at a constant rate in at least a part of the second period.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Baba Mitsuya

Classifications

• F05B2270/326

  Rotor angle · CPC title

• F03D7/0244 Primary

  for braking · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• F05B2270/1014

  to keep rotational speed constant · CPC title

• F03D7/0276

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