CN114412702B - Wind turbine generator and optimization method for dealing with pitch bearing clamping - Google Patents
Wind turbine generator and optimization method for dealing with pitch bearing clamping Download PDFInfo
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- CN114412702B CN114412702B CN202210072490.0A CN202210072490A CN114412702B CN 114412702 B CN114412702 B CN 114412702B CN 202210072490 A CN202210072490 A CN 202210072490A CN 114412702 B CN114412702 B CN 114412702B
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- 238000000034 method Methods 0.000 title claims abstract description 95
- 238000005457 optimization Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 36
- 230000000737 periodic effect Effects 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 abstract description 7
- 210000003746 feather Anatomy 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 4
- 238000013021 overheating Methods 0.000 abstract description 3
- 239000011295 pitch Substances 0.000 description 169
- 230000000903 blocking effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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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
- F03D7/00—Controlling wind motors
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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
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- 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
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- 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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Abstract
The application provides a wind turbine generator and an optimization method for dealing with pitch bearing clamping. In the optimization method, because the output torque of the variable pitch motor periodically and circularly changes between the first forward torque and the second forward torque, the output of the variable pitch motor in the wind turbine generator is periodically and oscillatorily output, namely, the variable pitch motor has repeated impact action on a barrier causing blade clamping stagnation, so that the variable pitch bearing can repeatedly impact the barrier causing blade clamping stagnation by using the control method, the possibility of scattering the barrier is improved, and the possibility of restoring the blade with clamping stagnation to normally change the pitch is improved. In the optimization method, when the time of the periodic cycle switching process exceeds the time threshold, the variable pitch motor is controlled to output the preset reverse torque until the blades feather, and the variable pitch motor is controlled to stop after the blades feather, so that the problem that the blades cannot feather due to overheating and dead halt of the variable pitch motor is avoided, and the runaway hidden danger of the unit is reduced.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a wind turbine generator and an optimization method for dealing with pitch bearing clamping.
Background
In recent years, as the service time of each wind turbine increases, accidents such as runaway and collapse of the wind turbine often occur. The runaway accident caused by the blocking of the blades in the wind turbine generator is one of the most serious equipment accidents of the wind power plant, and if the accident is light, most parts such as a blade changing system and the blades of the wind turbine generator are damaged, and if the accident is heavy, the blades are broken, the blade is used for sweeping the tower, bolts of the wind turbine generator are broken, a main frame is deformed, the generator and a gear box are damaged together, and even the accidents of fire, collapse and personal injury and death of the wind turbine generator are caused.
At present, a pitch control method in the prior art is as follows: before the blade is jammed, the blade normally pitches, as shown in stage 1 (the wavy line in the figure represents the fluctuation in practical application) in fig. 7 (the output torque is negative representing the forward torque, and the output torque is positive representing the reverse torque); after the blade is jammed, the output of the pitch motor is linearly increased until the maximum overload torque is increased and maintained, as shown in stage 2 in fig. 7 (the wavy line in the figure represents the fluctuation in practical application).
In stage 2 in fig. 7, the extra increased resistance is offset by increasing the output of the pitch motor, so as to recover the normal pitch of the blade, but for the case of blade sticking, the pitch control method is completely ineffective, that is, the normal pitch of the blade cannot be recovered.
In addition, if the blades are jammed, the variable pitch motor can bear the maximum overload torque for a long time, so that overheating self-locking of a variable pitch frequency converter in the variable pitch motor can be caused, namely, the variable pitch motor is overheated to crash, as shown in a stage 3 (a wavy line in a figure represents fluctuation in practical application) in fig. 7, and further, the blades cannot feather, namely, the unit has a hidden trouble of flying.
Therefore, how to improve the possibility that the jammed blade recovers to change the pitch normally and how to avoid the hidden trouble of runaway caused by overheat dead halt of the pitch motor is a technical problem to be solved urgently.
Disclosure of Invention
In view of the above, the invention provides a wind turbine generator and an optimization method for dealing with pitch bearing blocking, so as to improve the possibility that a blocked blade recovers to normally pitch.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the method is applied to a main controller of the wind turbine generator; the optimization method for dealing with the clamping of the variable-pitch bearing comprises the following steps:
in the pitch control process, judging whether a blade in the wind turbine generator has a blade clamping fault in real time;
if the blades have blade clamping faults, periodically and circularly switching the output torque of a variable pitch motor in the wind turbine generator between a first forward torque and a second forward torque;
judging whether the paddle has a paddle clamping fault in real time again in the periodic cycle switching process;
if the blade still has a blade clamping fault, continuing to execute the step of periodically and circularly switching the output torque of the variable-pitch motor between the first forward torque and the second forward torque of the variable-pitch motor;
and if the blade has no blade clamping fault, controlling the variable-pitch motor to output a preset forward torque.
Optionally, before the step of periodically and cyclically switching the output torque of the pitch motor between the first forward torque and the second forward torque, the method further includes:
gradually increasing the output torque of the variable pitch motor, and keeping corresponding first preset time after each increase until the output torque of the variable pitch motor reaches the first forward torque; an absolute value of the first forward torque is greater than an absolute value of the second forward torque;
after the output torque of the variable pitch motor reaches the first forward torque and is kept corresponding to the first preset time, executing the step of periodically and circularly switching the output torque of the variable pitch motor between the first forward torque and the second forward torque;
in the process of gradual height adjustment and maintenance, judging whether the blade has a blade clamping fault in real time;
if the blade still has a blade clamping fault, continuously executing the step of gradually increasing the output torque of the variable pitch motor;
and if the blade does not have the blade clamping fault, controlling the variable pitch motor to output the preset forward torque.
Optionally, before the step of periodically and cyclically switching the output torque of the pitch motor between the first forward torque and the second forward torque, the method further includes:
linearly increasing the output torque of the variable pitch motor until the output torque of the variable pitch motor reaches the first forward torque; an absolute value of the first forward torque is greater than an absolute value of the second forward torque;
after the output torque of the variable pitch motor reaches the first forward torque, keeping a second preset time, and then executing the step of periodically and circularly switching the output torque of the variable pitch motor between the first forward torque and the second forward torque;
in the linear height adjustment process, judging whether the blade has a blade clamping fault in real time;
if the blade has a blade clamping fault, continuing to perform the step of linearly increasing the output torque of the variable pitch motor;
and if the blade has no blade clamping fault, controlling the variable-pitch motor to output the preset forward torque.
Optionally, the absolute value of the first forward torque and the absolute value of the second forward torque are respectively equal to a maximum overload torque and a rated torque.
Optionally, after the step of periodically and cyclically switching the output torque of the pitch motor between the first forward torque and the second forward torque, the method further includes:
in the periodic cycle switching process, judging whether the running time of the periodic cycle switching process exceeds a time threshold value;
if the time for the periodic cycle switching process exceeds a time threshold, controlling the variable pitch motor to output a preset reverse torque until the blades are feathered, and controlling the variable pitch motor to stop after the blades are feathered;
and if the proceeding time of the periodic cycle switching process does not exceed the time threshold, continuously executing the step of judging whether the blade has blade clamping faults in real time again in the periodic cycle switching process.
Optionally, the absolute value of the preset reverse torque is equal to the rated torque.
Optionally, before the step of determining whether the blade has a blade jamming fault in real time in the pitch changing process, the method further includes:
judging whether a pitch-changing instruction is received;
and if the pitch control instruction is received, controlling the pitch control motor to output the preset forward torque.
Optionally, the absolute value of the preset forward torque is equal to the rated torque.
Optionally, the real-time judgment of whether the blade has a blade clamping fault includes:
judging whether the variable pitch speed of the blade and/or the variable pitch angle of the blade respectively lags behind corresponding preset values in real time;
if the variable pitch speed and/or the variable pitch angle respectively lag behind corresponding preset values, judging that the blade has a blade clamping fault;
and if the variable pitch speed and the variable pitch angle do not lag behind corresponding preset values respectively, judging that the blade has no blade clamping fault.
This application another aspect provides a wind turbine generator system, includes: the main structure, the variable pitch system and the main controller; wherein:
the main structure comprises at least two blades; the pitch system comprises at least two pitch motors; the main controller is respectively connected with the control end of a corresponding device in the main structure and the control end of each variable pitch motor and is used for executing the optimization method for the clamping of the variable pitch bearing on each variable pitch motor according to any one of the aspects of the application.
According to the technical scheme, the invention provides an optimization method for dealing with the clamping of the variable pitch bearing. In the optimization method for dealing with the clamping of the variable-pitch bearing, the output torque of the variable-pitch motor is periodically and circularly changed between the first forward torque and the second forward torque, so that the output of the variable-pitch motor in the wind turbine generator is periodically and oscillatingly output, namely, the variable-pitch motor has repeated impact effect on a barrier causing the clamping stagnation of the blades, the control method can repeatedly impact the barrier causing the clamping stagnation of the blades by the variable-pitch bearing, the possibility of scattering the barrier is improved, and the possibility of recovering the normal variable-pitch of the blades with the clamping stagnation is improved. According to the optimization method for dealing with the pitch bearing blocking, when the time for carrying out the periodic cycle switching process exceeds the time threshold, the pitch motor can be controlled to output the preset reverse torque until the blades are feathered, and the pitch motor is controlled to stop after the blades are feathered, so that the optimization method for dealing with the pitch bearing blocking can control the pitch motor to stop in time, the problem that the blades cannot feather due to overheating and dead halt of the pitch motor is avoided, and the flying hidden danger of the unit is reduced.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of an optimization method for dealing with pitch bearing jamming provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of another implementation of the optimization method for dealing with pitch bearing jamming provided in the embodiment of the present application before step S120;
fig. 3 is a schematic flow chart of another implementation of the optimization method for dealing with pitch bearing jamming provided in the embodiment of the present application before step S120;
fig. 4 and fig. 5 are schematic flow diagrams of two embodiments of an optimization method for dealing with pitch bearing chucking provided in an embodiment of the present application, respectively;
fig. 6 is a schematic flow diagram of an implementation manner of determining whether an oar clamping fault exists in an oar blade in a wind turbine generator in real time according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an output torque of a pitch motor when a pitch control method in the prior art is used for changing the pitch;
fig. 8 is a schematic diagram of an output torque of a pitch motor when the optimization method for coping with pitch bearing jamming provided by the embodiment of the present application is used for pitch control.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In this application, 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 terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "...," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
After the service time of the wind turbine generator is long, the abrasion of a variable-pitch bearing of a variable-pitch system is aggravated, and the reason for causing the abrasion comprises the following steps:
(1) Maintenance of the pitch bearing is not in place or the lubrication seals of the pitch bearing age. This may lead to poor lubrication of the pitch bearing, resulting in dry grinding, vibrational wear, corrosion, debris deposition.
(2) Overload operation of the pitch bearing. The bearing raceway, the retainer, the balls and other parts in the variable pitch bearing can be deformed, so that the surface debris of the variable pitch bearing falls off and is accumulated in the bearing raceway, and the rotation resistance of the variable pitch bearing is increased.
Become the wearing and tearing aggravation back that the oar bearing received, can cause serious influence to becoming the oar bearing, for example, lead to maintaining the required whole moment of force increase of the normal rotation of oar bearing, take place the paddle bite promptly this moment, for example again, lead to becoming the oar bearing unable rotation in a period of time, take place the paddle jamming promptly this moment.
The pitch control method mentioned in the background technology can be used for enabling the jammed blades to restore to normal pitch, but the jammed blades are ineffective, so that in order to improve the possibility that the jammed blades restore to normal pitch, the application provides an optimization method for dealing with the jamming of the pitch bearing, and the optimization method is applied to a main controller of a wind turbine generator; the specific flow of the optimization method for dealing with the pitch bearing clamping is shown in fig. 1, and specifically comprises the following steps:
and S110, judging whether the blades in the wind turbine generator have blade clamping faults or not in real time in the blade changing process.
If the paddle has a paddle clamping fault, sequentially executing the step S120 and the step S130; if the blade has no blade clamping fault, the step S140 is executed.
Wherein, the card oar trouble includes: blade jamming and blade jamming; since the above-mentioned detailed description has been given to the jamming of the blade and the jamming of the blade, the detailed description is omitted here.
And S120, periodically and circularly switching the output torque of the variable pitch motor in the wind turbine generator between the first forward torque and the second forward torque.
Taking fig. 8 as an example, the periodic cycle switching in step S120 is as shown in stage 3 in fig. 8, and the output torque of the pitch motor is periodically and cyclically switched between-20 Nm and-65 Nm, where negative output torque represents forward torque and positive output torque represents reverse torque.
Because the output torque of the variable pitch motor periodically and circularly changes between the first forward torque and the second forward torque, the output of the variable pitch motor in the wind turbine generator is periodically and oscillatingly output, and therefore the output of the variable pitch motor has repeated impact effect on obstacles causing blade clamping stagnation.
Optionally, in a certain period, the duration ratio of the first forward torque and the duration ratio of the second forward torque may be the same, as shown in stage 3 in fig. 8, or may be different, and this is not specifically limited herein, and may be determined according to specific situations, and all of them are within the protection scope of the present application.
Preferably, the absolute value of the first forward torque and the absolute value of the second forward torque are respectively equal to the maximum overload torque and the rated torque, so that the output of the variable pitch motor has more impact force; in practice, including but not limited to the preferred embodiment, it is not limited herein, and may be within the scope of the present application as the case may be.
Under the normal condition, the maximum overload torque of the variable pitch motor is 3 times of the rated torque; for example, taking a 1.5MW wind turbine as an example, the motor torque required during normal pitch variation, i.e., the rated torque, is generally about 20Nm, and therefore the maximum overload torque is generally about 60 Nm.
And S130, judging whether the blade is blocked in real time again in the periodic cycle switching process.
If the blade still has a blade clamping fault, continuing to execute the step S120; if the blade has no blade clamping fault, step S140 is executed.
And S140, controlling the variable pitch motor to output a preset forward torque.
Taking fig. 8 as an example, the output in step S140 is shown as stage 1 in fig. 8, and the output torque of the pitch motor fluctuates up and down near-20 Nm, which can be approximately considered to be equal to-20 Nm; the output torque is negative and represents positive torque, the output torque is positive and represents reverse torque, and the up-and-down fluctuation is not in an ideal state because of interference in practical application.
Alternatively, the absolute value of the preset forward torque may be equal to the rated torque; in practical applications, including but not limited to this embodiment, there is no specific limitation, and the embodiments are within the scope of the present application as the case may be.
Therefore, the output of the variable pitch motor in the wind turbine generator has repeated impact on the obstacles causing the clamping stagnation of the blades, so that the variable pitch bearing can repeatedly impact the obstacles causing the clamping stagnation of the blades by using the control method, the possibility of scattering the obstacles causing the clamping stagnation of the blades is improved, and the possibility of restoring the blades which are clamped to change the blades into normal blades is improved.
Another embodiment of the present application provides another implementation of the optimization method for dealing with pitch bearing jamming, a specific flow of which is shown in fig. 2, and on the basis of the foregoing embodiment, before step S120, the method further includes the following steps:
s210, gradually increasing the output torque of the variable pitch motor, and keeping corresponding first preset time after each increase until the output torque of the variable pitch motor reaches a first forward torque.
Taking fig. 8 as an example, the successive increases in step S210 are as shown in stage 2 in fig. 8, with the output torque increased to-25 Nm at 16S and held to 18S; then, at 19s, to-40 Nm, and held to 20s; finally, at 21s, to-65 Nm, and to 22s; wherein negative output torque represents positive torque and positive output torque represents reverse torque.
Wherein an absolute value of the first forward torque is greater than an absolute value of the second forward torque.
Corresponding first preset time is the first preset time corresponding to each time of the heightening target of the output torque of the variable pitch motor, and each first preset time can be completely the same or not, can be set according to actual requirements, is not specifically limited, and is within the protection range of the application.
Because the output torque of the variable pitch motor is gradually increased, the output of the variable pitch motor is in step-type output, and the output of the variable pitch motor has an impact effect on a barrier causing blade clamping stagnation.
And S220, after the output torque of the variable pitch motor reaches the first forward torque and is kept for corresponding first preset time, executing the step S120.
And S230, judging whether the blade has blade clamping faults in real time in the process of successive heightening and maintaining.
If the blade still has the blade clamping fault, executing the step S210; if the blade has no blade clamping fault, step S140 is executed.
According to the wind turbine generator system, the output of the variable pitch motor in the wind turbine generator set has an impact effect on the obstacles causing the clamping stagnation of the blades, so that the obstacles causing the clamping stagnation of the blades can be impacted before repeated impact by utilizing the embodiment, the possibility of the obstacles causing the clamping stagnation of the blades in the scattering is further improved, and the possibility of the blades with the clamping stagnation recovering the normal variable pitch is further improved.
Another embodiment of the present application provides another implementation of the optimization method for dealing with pitch bearing jamming, a specific flow of which is shown in fig. 3, and on the basis of the above embodiment, before step S120, the method further includes the following steps:
and S310, linearly increasing the output torque of the variable pitch motor until the output torque of the variable pitch motor reaches a first forward torque.
Wherein an absolute value of the first forward torque is greater than an absolute value of the second forward torque.
And S320, after the output torque of the variable pitch motor reaches the first positive torque, keeping the output torque for a second preset time, and then executing the step S120.
The second preset time may be set according to the actual situation, and is not specifically limited herein, and is within the protection scope of the present application.
And S330, in the linear height adjustment process, judging whether the blade has a blade clamping fault in real time.
If the paddle has a paddle clamping fault, executing step S310; if the blade has no blade clamping fault, the step S140 is executed.
Because the output torque of the variable pitch motor is linearly improved, the resistance additionally generated by the abrasion of the variable pitch bearing can be overcome, and the problem of the jamming of the blades can be solved by adding the steps S310-S330; and before the output torque of the variable pitch motor reaches the first forward torque, if the blade is always jammed, the jamming of the blade can be equivalently generated after the output torque of the variable pitch motor reaches the first forward torque, and the jamming can be used as a judgment basis for the jamming of the blade.
When the absolute value of the first forward torque and the absolute value of the second forward torque are the maximum overload torque and the rated torque, respectively, another embodiment of the present application provides another implementation of the optimization method for dealing with pitch bearing chucking, a specific flow of which is shown in fig. 4 (only shown on the basis of fig. 2), and on the basis of the above embodiment, after step S120, the following step is further included:
s410, in the periodic cycle switching process, judging whether the proceeding time of the periodic cycle switching process exceeds a time threshold value.
If the time for the periodic cycle switching process exceeds the time threshold, step S420 is executed; if the time for the periodic cycle switching process exceeds the time threshold, the step S130 is continuously executed.
And S420, controlling the variable pitch motor to output a preset reverse torque until the blades are feathered, and controlling the variable pitch motor to stop after the blades are feathered.
Taking fig. 8 as an example, the output in step S410 is shown as stage 4 in fig. 8, after 30S, the output torque fluctuates up and down around 20Nm, and then the output torque becomes 0Nm at a certain time, and this process is omitted in fig. 8 and is not repeated herein; the output torque is negative and represents positive torque, the output torque is positive and represents reverse torque, and the up-and-down fluctuation is not in an ideal state because of interference in practical application.
The time threshold is the longest time that the variable pitch motor can continuously output the maximum overload torque without stopping.
Optionally, the absolute value of the preset reverse torque is equal to the rated torque, and in practical applications, including but not limited to this embodiment, this embodiment is not specifically limited herein, and may be determined as the case may be, and is within the protection scope of the present application.
Therefore, step S410 is added in the embodiment, and the variable pitch motor can be controlled to stop in time, so that the problem that the blades cannot be feathered due to overheat and halt of the variable pitch motor is avoided, and potential safety hazards of the unit are reduced.
Another embodiment of the present application provides another implementation of the optimization method for dealing with pitch bearing jamming, and a specific flow of the method is as shown in fig. 5 (shown only on the basis of fig. 2), on the basis of the foregoing embodiment, before step S110, the method further includes the following steps:
and S510, judging whether a pitch changing instruction is received or not.
If receiving the pitch variation instruction, executing step S520; and if the pitch control instruction is not received, stopping executing the optimization method for responding to the pitch control bearing pitch clamping.
And S520, controlling the variable pitch motor to output a preset positive torque.
Another embodiment of the present application provides a specific implementation manner for determining whether an oar clamping fault exists in an oar blade of a wind turbine generator in real time, and a specific flow is shown in fig. 6, including the following steps:
s610, judging whether the variable pitch speed of the blades and/or the variable pitch angle of the blades respectively lag behind corresponding preset values in real time.
If the pitch speed and/or the pitch angle respectively lag behind the corresponding preset values, executing the step S620; if the pitch speed and the pitch angle do not lag behind the corresponding preset values, the step S630 is executed.
S620, judging that the blade has a blade clamping fault.
S630, judging that the paddle does not have the paddle clamping fault.
Wherein, the corresponding preset value of the variable pitch speed comprises: the preset values of the variable pitch speed at all times include: the preset value of the variable pitch angle at each moment; in addition, the preset value of the variable pitch speed at each moment and the preset value of the variable pitch angle at each moment are both set according to the actual condition of normal variable pitch, so that the preset value of the variable pitch speed at each moment can represent the variable pitch speed at each moment in the normal variable pitch process, and the preset value of the variable pitch angle at each moment can represent the variable pitch angle at each moment in the normal variable pitch process.
Therefore, at a certain moment, the variable pitch speed of the blade lags behind the corresponding preset value, and/or the variable pitch angle of the blade lags behind the corresponding preset value, which both indicate that the variable pitch state of the blade at the moment does not reach the actual normal variable pitch state; at a certain moment, the variable pitch speed of the blades does not lag behind the corresponding preset value, and the variable pitch angle of the blades does not lag behind the corresponding preset value, which indicates that the variable pitch state of the blades at the moment reaches the actual normal variable pitch state.
The above is only a specific example for judging whether the blade in the wind turbine generator has the blade clamping fault in real time, and in practical applications, the examples include but are not limited to the above examples, which are not specifically limited herein, and may be determined according to specific situations, and are within the protection scope of the present application.
Another embodiment of the present application provides a wind turbine generator, which specifically includes: the main structure, the variable pitch system and the main controller.
In the wind turbine, the main structure comprises at least two blades; the variable pitch system comprises at least two variable pitch motors; the main controller is respectively connected with the control end of the corresponding device in the main structure and the control end of each variable pitch motor, and is used for executing the optimization method for the variable pitch bearing blocking provided by the embodiment on each variable pitch motor.
Optionally, the main controller may be integrated in the pitch system, or may be independent of the pitch system, and is not specifically limited herein, and is within the protection scope of the present application.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed solution, or to modify equivalent embodiments, without departing from the scope of the solution, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (8)
1. An optimization method for dealing with pitch bearing clamping is characterized by being applied to a main controller of a wind turbine generator; the optimization method for dealing with the clamping of the variable-pitch bearing comprises the following steps:
in the pitch control process, judging whether a blade in the wind turbine generator has a blade clamping fault in real time;
if the blades have blade clamping faults, gradually increasing the output torque of the variable-pitch motor, and keeping the output torque for corresponding first preset time after each increase until the output torque of the variable-pitch motor reaches first forward torque;
after the output torque of the variable-pitch motor reaches the first forward torque and is kept corresponding to the first preset time, periodically and circularly switching the output torque of the variable-pitch motor in the wind turbine generator between the first forward torque and the second forward torque; an absolute value of the first forward torque is greater than an absolute value of the second forward torque;
or,
if the paddle has a paddle clamping fault, linearly increasing the output torque of the variable-pitch motor until the output torque of the variable-pitch motor reaches the first forward torque;
after the output torque of the variable pitch motor reaches the first forward torque and is kept for a second preset time, periodically and circularly switching the output torque of the variable pitch motor in the wind turbine generator between the first forward torque and the second forward torque;
judging whether the paddle has a paddle clamping fault in real time again in the periodic cycle switching process;
if the blade is still blocked, continuously executing the step of periodically and circularly switching the output torque of the variable-pitch motor between the first forward torque and the second forward torque of the variable-pitch motor;
if the blade has no blade clamping fault, controlling the variable-pitch motor to output a preset forward torque;
in the process of successive height adjustment and maintenance, judging whether the blade has a blade clamping fault in real time;
if the blade still has a blade clamping fault, continuously executing the step of gradually increasing the output torque of the variable pitch motor;
if the blade does not have the blade clamping fault, controlling the variable-pitch motor to output the preset forward torque;
or,
in the linear height adjustment process, judging whether the blade has a blade clamping fault in real time;
if the blade has a blade clamping fault, continuing to perform the step of linearly increasing the output torque of the variable pitch motor;
and if the blade has no blade clamping fault, controlling the variable-pitch motor to output the preset forward torque.
2. The method for optimizing pitch bearing jamming according to claim 1, wherein the absolute value of the first forward torque and the absolute value of the second forward torque are equal to a maximum overload torque and a rated torque, respectively.
3. The method for optimizing pitch bearing jam according to claim 2, wherein after the step of periodically and cyclically switching the output torque of the pitch motor between the first forward torque and the second forward torque, the method further comprises:
in the periodic cycle switching process, judging whether the running time of the periodic cycle switching process exceeds a time threshold value;
if the time for the periodic cycle switching process exceeds a time threshold, controlling the variable pitch motor to output a preset reverse torque until the blades are feathered, and controlling the variable pitch motor to stop after the blades are feathered;
and if the proceeding time of the periodic cycle switching process does not exceed the time threshold, continuously executing the step of judging whether the blade has blade clamping faults in real time again in the periodic cycle switching process.
4. The method of claim 3, wherein the absolute value of the predetermined reverse torque is equal to a rated torque.
5. The optimization method for dealing with pitch bearing jamming according to claim 1, wherein before the step of judging whether the blade has jamming failure in real time in a pitch changing process, the method further comprises:
judging whether a pitch change instruction is received or not;
and if the pitch control instruction is received, controlling the pitch control motor to output the preset forward torque.
6. The optimization method for dealing with pitch bearing jamming according to any one of claims 1 to 5, wherein an absolute value of the preset forward torque is equal to a rated torque.
7. The optimization method for dealing with pitch bearing blade jamming according to any one of claims 1 to 5, wherein the step of judging whether the blade has blade jamming faults in real time comprises the following steps:
judging whether the variable pitch speed of the blades and/or the variable pitch angle of the blades respectively lag behind corresponding preset values in real time;
if the variable pitch speed and/or the variable pitch angle respectively lag behind corresponding preset values, judging that the blade has a blade clamping fault;
and if the variable pitch speed and the variable pitch angle do not lag behind corresponding preset values respectively, judging that the blade has no blade clamping fault.
8. A wind turbine, comprising: the main structure, the variable pitch system and the main controller; wherein:
the main structure comprises at least two blades; the pitch system comprises at least two pitch motors;
the main controller is respectively connected with the control end of a corresponding device in the main structure and the control end of each variable pitch motor, and is used for executing the optimization method for the corresponding variable pitch bearing clamping according to any one of claims 1 to 7 on each variable pitch motor.
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