Gravity return control method and device for pitch control system
A technology of a pitch control system and a control method, which is applied in the control of wind turbines, engine control, wind turbines, etc., and can solve problems such as wind turbine overspeed, speeding danger, wind turbine speed cannot be reduced, etc., to ensure stability and reliability , Improve the effect of market competitiveness
Active Publication Date: 2019-09-10
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 present invention provides a gravity pitch back control method and device of a pitch control system. The control method includes: when it is detected that the blades of the fan cannot be pitched back, acquiring the blade azimuth angle of the blade; determining the blade azimuth angle according to the blade azimuth angle Position information of the blades; according to the position information, the pitch motor on the wind turbine is controlled to release / lock the brakes, so as to control the blades to perform a pitch-back operation under the action of gravity. The gravity return control method and device of the pitch control system provided by the present invention utilize the gravity rules of the fan blades during the rotation process to control the release / lock brake of the pitch motor on the fan according to the position information, effectively overcoming the existing In the technology, when the blades cannot perform the normal return operation, the speed of the wind turbine may not be reduced, causing the wind turbine to overspeed or even the risk of speeding, thus effectively ensuring the stability and reliability of the wind turbine operation .
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...
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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