CN113757049A - Blade angle measuring and checking system and method for variable pitch system of wind turbine generator - Google Patents

Blade angle measuring and checking system and method for variable pitch system of wind turbine generator Download PDF

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Publication number
CN113757049A
CN113757049A CN202110924917.0A CN202110924917A CN113757049A CN 113757049 A CN113757049 A CN 113757049A CN 202110924917 A CN202110924917 A CN 202110924917A CN 113757049 A CN113757049 A CN 113757049A
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China
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proximity switch
angle
pitch bearing
pitch
variable
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CN202110924917.0A
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CN113757049B (en
Inventor
王森
杜杨超
李德志
王浩
王岳峰
薛晓云
柏俊山
常嫦
朱文博
令狐瑞琪
李瑞涛
张冬冬
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Taiyuan Heavy Industry Co Ltd
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Taiyuan Heavy Industry Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/328—Blade pitch angle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/60—Control system actuates through
    • F05B2270/602—Control system actuates through electrical actuators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a system and a method for measuring and verifying blade angle of a pitch system of a wind turbine generator. The blade angle measuring and checking system of the wind turbine generator pitch system comprises a controller, a pitch motor encoder, a first proximity switch and a second proximity switch, wherein the first proximity switch and the second proximity switch are fixed on an impeller hub through a mounting bracket, and signal detection ends of the first proximity switch and the second proximity switch point to the inner tooth surface of a pitch bearing. According to the method for measuring and verifying the blade angle of the variable-pitch system of the wind turbine generator, the variable-pitch bearing angle is accurately measured in real time by adopting the double proximity switches, and is compared with the blade angle measured by the variable-pitch motor encoder to complete verification, so that the correctness of the blade angle is ensured, and the safe and efficient operation of the wind turbine generator is ensured.

Description

Blade angle measuring and checking system and method for variable pitch system of wind turbine generator
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a system and a method for measuring and verifying blade angle of a variable pitch system of a wind turbine generator.
Background
The variable pitch system is one of core parts of a control system of the wind turbine generator and plays an important role in safe, stable and efficient operation of the wind turbine generator. In the control of a variable pitch system, the measurement of the angle of a fan blade is a very important part, and in order to ensure the accuracy of the measurement of the angle of the fan blade by the variable pitch system, a redundant sensor needs to be arranged in the variable pitch system to measure and verify the angle of the fan blade.
In the prior art, the redundant measurement of the blade angle of the wind turbine generator adopts an encoder measurement or a proximity switch measurement. Compared with a proximity switch measuring method, the encoder measuring method has the advantages that the number of parts is more, the structure is more complex, the fault rate is high, and the maintenance difficulty and the cost are higher; the measurement method of the proximity switch is low in cost and convenient to maintain, but the measurement precision is low.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a system and a method for measuring and verifying the blade angle of a variable pitch system of a wind turbine generator.
In one aspect of the invention, the blade angle measuring and checking system for the pitch system of the wind turbine generator comprises a controller, a pitch motor encoder, a first proximity switch and a second proximity switch, wherein the first proximity switch and the second proximity switch are fixed on an impeller hub through a mounting bracket, and signal detection ends of the first proximity switch and the second proximity switch point to the inner tooth surface of a pitch bearing.
Preferably, in the system for measuring and verifying the blade angle of the pitch system of the wind turbine generator, the installation distance from the first proximity switch and the second proximity switch to the inner tooth surface of the pitch bearing is less than or equal to the induction distance of the first proximity switch and the second proximity switch.
Preferably, in the system for measuring and checking the blade angle of the pitch system of the wind turbine generator, when the first proximity switch and the second proximity switch detect the positions of the convex teeth and the concave teeth of the inner tooth surface of the pitch bearing, high and low level pulse signals are respectively generated by induction, wherein the first proximity switch and the second proximity switch generate a high level H when facing the convex teeth, and the first proximity switch and the second proximity switch generate a low level L when pointing to the concave teeth.
In addition, in another aspect of the present invention, a wind turbine generator pitch system blade angle measurement and verification method implemented by using the wind turbine generator pitch system blade angle measurement and verification system is provided, and the wind turbine generator pitch system blade angle measurement and verification method includes the following steps:
(1) calibrating the blade angle by zero, aligning the blade angle with the hub angle, resetting the variable pitch angle measured by a variable pitch motor encoder and a proximity switch by a controller to finish the calibration of the blade angle by zero, and then normally operating a variable pitch system;
(2) in the operation process of the variable pitch system, when the variable pitch bearing rotates, the rotating angle Q of the variable pitch bearing is measured in real time through the first proximity switch and the second proximity switch;
(3) calculating a current variable pitch bearing angle W, wherein when the variable pitch bearing starts to rotate clockwise by an angle Q from an angle P before the variable pitch bearing rotates, the current variable pitch bearing angle W is equal to the angle P before the variable pitch bearing rotates plus the angle Q after the variable pitch bearing rotates; when the variable-pitch bearing starts to rotate counterclockwise by an angle Q from an angle P before the variable-pitch bearing rotates, the current variable-pitch bearing angle W is equal to the angle P before the variable-pitch bearing rotates, namely the angle Q after the variable-pitch bearing rotates;
(4) the correctness of the variable pitch angle is verified in real time by comparing the current variable pitch bearing angle W with the blade angle A measured by the variable pitch motor encoder, if the deviation between the current variable pitch bearing angle W measured by the first proximity switch and the second proximity switch and the blade angle A measured by the variable pitch motor encoder is larger than a preset threshold parameter T, the controller reports a fault, otherwise, the variable pitch system continues to operate normally.
Preferably, in the method for measuring and verifying the blade angle of the pitch system of the wind turbine generator, the step (2) of measuring the angle Q of the rotation of the pitch bearing includes calculating the angle Q of the rotation of the pitch bearing by using the numbers of the pulse signals along the first proximity switch and the second proximity switch:
Q＝a×(M-N)/(K+M)×360°/D+b×N/(K+M)×360°/D+c×(K-N)/(K+M)×360°/D+d×N/(K+M)×360°/D，
d is the total tooth number of inner teeth of the variable pitch bearing, K is the width of convex teeth of the variable pitch bearing, M is the width of concave teeth of the variable pitch bearing, N is the installation distance (N is less than K, N is less than M) between the first proximity switch and the second proximity switch, and a, b, c and D are the number of LL edge pulse signals, the number of HL edge pulse signals, the number of HH edge pulse signals and the number of LH edge pulse signals which are collected by the first proximity switch and the second proximity switch when the variable pitch bearing rotates towards one direction respectively.
Preferably, in the method for measuring and verifying the blade angle of the pitch system of the wind turbine generator, the step (3) of calculating the current pitch bearing angle W includes determining the rotation direction of the pitch bearing according to the cyclic sequence of the pulse signals acquired by the first proximity switch and the second proximity switch: if the pulse signals are circulated in sequence according to the sequence of LL, HL, HH and LH, the variable pitch bearing rotates clockwise, and if the pulse signals are circulated in sequence according to the sequence of LH, HH, HL and LL, the variable pitch bearing rotates anticlockwise.
The system and the method for measuring and verifying the blade angle of the variable-pitch system of the wind turbine generator set have the advantages that the cost and the measurement precision are considered, the angle of the variable-pitch bearing is accurately measured in real time by adopting the double proximity switches, and the angle is compared with the blade angle measured by the variable-pitch motor encoder to complete verification, so that the correctness of the blade angle is ensured, and the safe and efficient operation of the wind turbine generator set is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the blade angle measurement and verification system of the pitch system of the wind turbine generator system according to the present invention;
FIG. 2 is a schematic view of a proximity switch and an inner tooth surface of a pitch bearing in the wind turbine generator pitch system blade angle measurement and verification system of the present invention;
FIG. 3 is a schematic diagram of a high-low level signal sequence when a proximity switch in a wind turbine generator pitch system blade angle measuring and verifying system measures the inner tooth surface of a pitch bearing;
FIG. 4 is a schematic flow chart of a method for measuring and verifying the blade angle of a pitch system of a wind turbine generator according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the blade angle measuring and checking system of the pitch system of the wind turbine generator set comprises a controller 1, a pitch motor 2, a pitch motor encoder 3, a first proximity switch 4 and a second proximity switch 5, wherein the first proximity switch 4 and the second proximity switch 5 are fixed on an impeller hub through a mounting bracket, the first proximity switch 4 and the second proximity switch 5 are mounted such that signal detection ends of the first proximity switch 4 and the second proximity switch 5 point to an inner tooth surface of a pitch bearing, and the mounting distance from the first proximity switch 4 and the second proximity switch 5 to the inner tooth surface of the pitch bearing is less than or equal to the sensing distance from the first proximity switch 4 and the second proximity switch 5.
As shown in fig. 2, since the signal detection ends of the first proximity switch 4 and the second proximity switch 5 point to the inner tooth surface of the pitch bearing, when the pitch bearing rotates, the first proximity switch 4 and the second proximity switch 5 respectively generate different high and low level pulse signals by induction when detecting the positions of the convex tooth TC and the concave tooth AC of the inner tooth surface of the pitch bearing, wherein the proximity switch generates a high level H by induction when facing the convex tooth TC, and the proximity switch generates a low level L by induction when pointing to the concave tooth AC.
For example, as shown in fig. 3, the first proximity switch 4 and the second proximity switch 5 collect four edge pulse signals LL, HL, HH, LH every time one convex-concave tooth period passes.
The blade angle (variable pitch bearing angle) of the variable pitch system can be accurately measured and calculated according to the accumulated high and low level pulse number, and then compared with the blade angle measured by the variable pitch motor encoder 3, and redundancy check of the blade angle of the variable pitch system is completed. And if the deviation between the blade angle calculated according to the high and low level pulse numbers and the blade angle measured by the variable pitch motor encoder is larger than a preset threshold parameter, the controller reports a fault. Therefore, the correctness of the angle of the paddle can be ensured, and the safe and efficient operation of the wind turbine generator is ensured.
As shown in fig. 4, the method for measuring and verifying the blade angle of the pitch system of the wind turbine generator, which is implemented by using the system for measuring and verifying the blade angle of the pitch system of the wind turbine generator, comprises the following steps:
(1) and calibrating the blade angle by zero, aligning the blade angle with the hub angle, resetting the variable pitch angle measured by the variable pitch motor encoder and the proximity switch by the controller to finish the calibration of the blade angle by zero, and then normally operating the variable pitch system.
(2) In the operation process of the variable pitch system, when the variable pitch bearing rotates, the rotating angle Q of the variable pitch bearing is measured in real time through the first proximity switch and the second proximity switch, namely: and calculating the rotating angle Q of the pitch bearing by using the number of pulse signals collected by the first proximity switch and the second proximity switch.
Specifically, when the pitch bearing rotates in one direction, the pulse signals collected by the first proximity switch and the second proximity switch are respectively as follows: LL is along pulse signal a, HL is along pulse signal b, HH is along pulse signal c, LH is along pulse signal d, then the angle Q that the variable pitch bearing rotated is:
q is a x (M-N)/(K + M) x 360 DEG/D + b x N/(K + M) x 360 DEG/D + c x (K-N)/(K + M) x 360 DEG/D + D x N/(K + M) x 360 DEG/D, wherein D is the total number of teeth of the inner teeth of the pitch bearing, K is the width of the convex teeth of the pitch bearing, M is the width of the concave teeth of the pitch bearing, and N is the installation distance between the first proximity switch and the second proximity switch (N is less than K and N is less than M).
(3) Calculating a current variable pitch bearing angle W, wherein when the variable pitch bearing starts to rotate clockwise by an angle Q from an angle P before the variable pitch bearing rotates, the current variable pitch bearing angle W is equal to the angle P before the variable pitch bearing rotates plus the angle Q after the variable pitch bearing rotates; when the variable pitch bearing starts to rotate counterclockwise by an angle Q from an angle P before the rotation, the current variable pitch bearing angle W is equal to the angle P before the rotation of the variable pitch bearing-the angle Q after the rotation of the variable pitch bearing.
The rotating direction of the variable pitch bearing is judged according to the cycle sequence of the pulse signals acquired by the first proximity switch and the second proximity switch: if the pulse signals are circulated in sequence according to the sequence of LL, HL, HH and LH, the variable pitch bearing rotates clockwise, and if the pulse signals are circulated in sequence according to the sequence of LH, HH, HL and LL, the variable pitch bearing rotates anticlockwise.
(4) The correctness of the variable pitch angle is verified in real time by comparing the current variable pitch bearing angle W with the blade angle A measured by the variable pitch motor encoder. If the deviation between the current variable-pitch bearing angle W measured by the first proximity switch and the second proximity switch and the blade angle A measured by the variable-pitch motor encoder is larger than the preset threshold parameter T, the controller reports a fault, otherwise, the variable-pitch system continues to operate normally.
In summary, the system and the method for measuring and verifying the blade angle of the pitch system of the wind turbine generator set have the advantages that the cost and the measurement precision are considered, the double proximity switches are adopted to accurately measure the angle of the pitch bearing in real time, and the angle is compared with the blade angle measured by the pitch motor encoder to complete verification, so that the correctness of the blade angle is ensured, and the safe and efficient operation of the wind turbine generator set is ensured.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Meanwhile, the term "connected" and the like as used herein should be broadly interpreted as referring to a fixed connection, a detachable connection, a direct connection, or an indirect connection through intermediate components. In addition, "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like are referred to herein as being placed in the state shown in the drawings.
It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.

Claims (6)

1. The utility model provides a wind turbine generator system oar blade angle measurement and calibration system, its characterized in that, includes controller, becomes oar motor encoder, first proximity switch and second proximity switch, wherein first proximity switch with the second proximity switch all fixes on impeller wheel hub through the installing support, and the signal detection end of first proximity switch and second proximity switch points to becomes oar bearing inner tooth face.
2. The wind turbine generator pitch system blade angle measurement and verification system of claim 1, wherein a mounting distance of the first proximity switch and the second proximity switch to an inner tooth surface of a pitch bearing is less than or equal to an induction distance of the first proximity switch and the second proximity switch.
3. The system for measuring and verifying blade angle of a pitch system of a wind turbine generator according to claim 1, wherein the first proximity switch and the second proximity switch respectively generate high and low level pulse signals by induction when detecting the positions of a convex tooth and a concave tooth of an inner tooth surface of a pitch bearing, wherein the first proximity switch and the second proximity switch generate a high level H by induction when facing the convex tooth, and the first proximity switch and the second proximity switch generate a low level L by induction when pointing to the concave tooth.
4. A wind turbine generator pitch system blade angle measurement and verification method implemented by the wind turbine generator pitch system blade angle measurement and verification system according to any one of claims 1 to 3, wherein the wind turbine generator pitch system blade angle measurement and verification method comprises the steps of:
(1) calibrating the blade angle by zero, aligning the blade angle with the hub angle, resetting the variable pitch angle measured by a variable pitch motor encoder and a proximity switch by a controller to finish the calibration of the blade angle by zero, and then normally operating a variable pitch system;
(2) in the operation process of the variable pitch system, when the variable pitch bearing rotates, the rotating angle Q of the variable pitch bearing is measured in real time through the first proximity switch and the second proximity switch;
(3) calculating a current variable pitch bearing angle W, wherein when the variable pitch bearing starts to rotate clockwise by an angle Q from an angle P before the variable pitch bearing rotates, the current variable pitch bearing angle W is equal to the angle P before the variable pitch bearing rotates plus the angle Q after the variable pitch bearing rotates; when the variable-pitch bearing starts to rotate counterclockwise by an angle Q from an angle P before the variable-pitch bearing rotates, the current variable-pitch bearing angle W is equal to the angle P before the variable-pitch bearing rotates, namely the angle Q after the variable-pitch bearing rotates;
(4) the correctness of the variable pitch angle is verified in real time by comparing the current variable pitch bearing angle W with the blade angle A measured by the variable pitch motor encoder, if the deviation between the current variable pitch bearing angle W measured by the first proximity switch and the second proximity switch and the blade angle A measured by the variable pitch motor encoder is larger than a preset threshold parameter T, the controller reports a fault, otherwise, the variable pitch system continues to operate normally.
5. The wind turbine generator pitch system blade angle measuring and verifying method according to claim 4, wherein the step (2) of measuring the angle Q of the pitch bearing rotation includes calculating the angle Q of the pitch bearing rotation by using the numbers of pulse signals along the first proximity switch and the second proximity switch, which are acquired by the first proximity switch and the second proximity switch:
q is a x (M-N)/(K + M) x 360 DEG/D + b x N/(K + M) x 360 DEG/D + c x (K-N)/(K + M) x 360 DEG/D + D x N/(K + M) x 360 DEG/D, wherein D is the total number of teeth of the inner teeth of the pitch bearing, K is the width of the convex teeth of the pitch bearing, M is the width of the concave teeth of the pitch bearing, N is the installation distance between the first proximity switch and the second proximity switch (N is less than K, and N is less than M), and a, b, c and D are the number of LL edge pulse signals, the number of HL edge pulse signals, the number of HH edge pulse signals and the number of LH edge pulse signals acquired by the first proximity switch and the second proximity switch when the pitch bearing rotates in one direction.
6. The wind turbine generator system pitch system blade angle measuring and verifying method according to claim 5, wherein calculating the current pitch bearing angle W in step (3) includes determining a rotation direction of the pitch bearing through a cyclic sequence of pulse signals acquired by the first proximity switch and the second proximity switch: if the pulse signals are circulated in sequence according to the sequence of LL, HL, HH and LH, the variable pitch bearing rotates clockwise, and if the pulse signals are circulated in sequence according to the sequence of LH, HH, HL and LL, the variable pitch bearing rotates anticlockwise.
CN202110924917.0A 2021-08-12 2021-08-12 Wind turbine generator system variable pitch system blade angle measurement and verification system and method Active CN113757049B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117685179A (en) * 2024-01-31 2024-03-12 安徽容知日新科技股份有限公司 Fan variable pitch system monitoring method, monitoring equipment and storage medium

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Publication number Priority date Publication date Assignee Title
CN107313900A (en) * 2017-06-28 2017-11-03 沈阳华创风能有限公司 Hub of wind power generator blade position monitoring method and system
CN111287915A (en) * 2020-03-26 2020-06-16 埃斯倍风电科技(青岛)有限公司 Device and method for measuring rotation angle of fan blade
CN212202361U (en) * 2020-03-26 2020-12-22 埃斯倍风电科技(青岛)有限公司 Measuring device for rotation angle of fan blade

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107313900A (en) * 2017-06-28 2017-11-03 沈阳华创风能有限公司 Hub of wind power generator blade position monitoring method and system
CN111287915A (en) * 2020-03-26 2020-06-16 埃斯倍风电科技(青岛)有限公司 Device and method for measuring rotation angle of fan blade
CN212202361U (en) * 2020-03-26 2020-12-22 埃斯倍风电科技(青岛)有限公司 Measuring device for rotation angle of fan blade

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117685179A (en) * 2024-01-31 2024-03-12 安徽容知日新科技股份有限公司 Fan variable pitch system monitoring method, monitoring equipment and storage medium
CN117685179B (en) * 2024-01-31 2024-04-19 安徽容知日新科技股份有限公司 Fan variable pitch system monitoring method, monitoring equipment and storage medium

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