Control method and device for gravitational pitch recovery of variable pitch system
A technology of a pitch system and a control device, which is applied in the control of wind turbines, engine control, wind turbines, etc., can solve the problems of the danger of flying cars, the overspeed of the wind turbine, and the inability to reduce the rotation speed of the wind turbine, so as to improve the market competitiveness. , to ensure the effect of stable and reliable
Active Publication Date: 2018-08-24
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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Problems solved by technology
[0006] The present invention provides a gravity pitch back control method and device for a pitch variable system, which is used to solve the problem in the prior art that when the blades of the wind power generator cannot perform normal pitch back operation, under the action of wind force, it is easy to make wind power generation The speed of the wind turbine cannot be reduced, causing the problem of overspeeding of the wind turbine and even the danger of speeding
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[0061] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0062] Below, some terms in this application are explained, so that those skilled in the art can understand:
[0063] 1. Azimuth (Toothed Belt), the blade azimuth angle is defined as: when the tip of a certain blade is facing upward, the blade azimuth angle is 0 degrees; after the blade rotates for a week, it turns to the position where the blade tip is facing again, and the blade azimuth angle is 360° Spend. That is, the blade azimuth angle is an angle value that changes continuously and periodically between 0 and 360 degrees as the blade rotates; the azimuth angles of the three blades are calculated from the blade azimuth angles.
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The invention provides a control method and device for gravitational pitch recovery of a variable pitch system. The control method comprises the following steps: acquiring blade orientation angles when the blades of a fan fail to recover under detection; determining position information on the blades according to the blade orientation angles; and controlling a variable-pitch motor of the fan to release a brake / clasp the brake in order to control the blades to perform recovery operation under the gravity effect. With the control method and device for gravitational pitch recovery of the variablepitch system, gravity rules of the blades of the fan are utilized during a rotary process. The variable-pitch motor of the fan is controlled to release the brake / clasp the brake according to the position information. Therefore, a problem in the prior art is effectively overcome. When the blades are unable to normally perform recovery operation, the rotating speed of a wind driven generator can bedecreased. Accordingly, the wind driven generator does not overspeed or even gallop. As a result, stability and reliability of the operation of the wind driven generator are effectively ensured.
Description
technical field [0001] The present invention relates to the technical field of wind power, in particular to a method and device for controlling gravity return of a pitch system. Background technique [0002] In large-scale wind turbines, one of the main functions of the pitch system is to control the speed of the wind rotor by controlling the angle of the blades, thereby controlling the output power of the fan: during normal operation of the fan, when the wind speed is lower than the rated wind speed of the unit, the pitch system controls The blades are opened to the 0-degree angle position for maximum power tracking; when the wind speed exceeds the rated wind speed of the unit, the pitch system keeps the speed of the wind rotor constant by controlling the angle of the blades. [0003] It can be seen from the above that one of the main functions of the pitch control system is to act as the main braking system of the unit. The electric pitch control system ensures the safe an...
Claims
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IPC IPC(8): F03D7/02F03D7/04
CPCF03D7/0224F03D7/0264F03D7/0276F03D7/042F05B2260/90F05B2270/329F05B2270/602Y02E10/72
Inventor 马磊李庆江
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD