CN105257471B - Wind power generating set award setting method, apparatus and system - Google Patents

Wind power generating set award setting method, apparatus and system Download PDF

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Publication number
CN105257471B
CN105257471B CN201510696725.3A CN201510696725A CN105257471B CN 105257471 B CN105257471 B CN 105257471B CN 201510696725 A CN201510696725 A CN 201510696725A CN 105257471 B CN105257471 B CN 105257471B
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wind
value
angle
blade
maximum
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CN105257471A (en
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李健
欧发顺
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

Abstract

The present invention provides a kind of control method of wind power generating set propeller pitch angle, apparatus and system, and this method includes:Obtain power output of the wind power generating set in Man Faqian changeover portion;When the power output occurs abnormal, according to the maximum reference value of wind angle when the maximum reference value of wind angle, blade stall are normal during the blade stall exception being obtained ahead of time and initial minimum propeller pitch angle, the propeller pitch angle of blade is determined.Technical solution of the present invention improves generating efficiency of the wind power generator group in life cycle under conditions of unit fatigue load and ultimate load is not increased.

Description

Wind power generating set award setting method, apparatus and system
Technical field
The present invention relates to technical field of wind power, more particularly to wind-driven generator award setting method, apparatus and system.
Background technology
Two sections of operations be present in Man Faqian (before i.e. power output reaches rated power) in modern large-scale wind driven generator Area, first, generator not yet reaches rated speed, this area is referred to as maximal wind-energy capture section;Second, generator reaches specified turn Speed, but power output not yet reaches rated power, and this area is referred to as changeover portion, and generally, generator is by increasing electromagnetism Moment of torsion improves power output.At the scene under actual working conditions, in changeover portion stall event easily occurs for blade, causes blade Aeroperformance is reduced, and reduces blade and wind energy is absorbed, and blade, which is contributed, to be reduced, and power output reduces, and directly affects machine Power curve of the group in the wind speed section.
Generally, wind-driven generator keeps constant in changeover portion propeller pitch angle, by adjusting electromagnetic torque so as to adjusting Generator speed, unit is set to ensure bigger tip-speed ratio, it is ensured that unit absorption wind energy as much as possible.Under actual conditions, when Fan operation is under some extreme operating conditions, and such as high temperature, under high altitude condition, blade can have stall condition in changeover portion:Blade Lift reduces, and resistance increase, the wind energy uptake of blade diminishes, and showing as changeover portion power curve in power output deviates guarantee Power curve, there is collapse phenomenon.
For blade stall, traditional solution is to improve the rated speed of unit, and/or improves tip speed ratio, and/ Or power coefficient Cp is improved, so as to improve power output.However, the rated speed of generator is higher, unit is normally being transported The fatigue load and ultimate load born during row are bigger, may influence safe operation of the unit in whole life cycle.Therefore, Under the precondition for ensuring unit safety operation, the space of the rated speed lifting of generator is very limited.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of control method of wind power generating set propeller pitch angle, device and System, to solve prior art wind generator in the case of blade stall by improving rated speed, tip speed ratio etc. Mode adjusts the adverse effect to unit safety operation ability that power output is brought.
On the one hand, there is provided a kind of control method of wind power generating set propeller pitch angle, it includes:
Obtain power output of the wind power generating set in Man Faqian changeover portion;
When the power output occurs abnormal, referred to according to the maximum of wind angle during the blade stall exception being obtained ahead of time The maximum reference value of wind angle and initial minimum propeller pitch angle when value, blade stall are normal, determine the propeller pitch angle of blade.
On the other hand, a kind of control device of wind power generating set propeller pitch angle is also provided, it includes:
Acquisition module, for obtaining power output of the wind power generating set in Man Faqian changeover portion;
Judge module, for judging whether the power output exception occurs;
Processing module, for when the power output occur it is abnormal when, according to wind during the blade stall exception being obtained ahead of time The maximum reference value of wind angle and initial minimum propeller pitch angle, determine blade when maximum reference value, blade stall to angle are normal Propeller pitch angle.
Another aspect, a kind of control system of the wind power generating set propeller pitch angle in wind power plant is also provided, it includes more Individual wind power generating set and field controller, each wind electricity hair unit includes reporting module, for reporting wind power generating set Power output;It is provided with the field controller according to said apparatus, the field controller also includes issuing module, for by institute State the propeller pitch angle after determining and be issued to corresponding wind power generating set to carry out real-time propeller pitch angle adjustment.
The advantageous effects of above-mentioned technical proposal are as follows:
Above-mentioned technical proposal is by obtaining power output of the wind power generating set in Man Faqian changeover portion;When the output work When rate occurs abnormal, according to wind when the maximum reference value of wind angle, blade stall are normal during the blade stall exception being obtained ahead of time Maximum reference value and initial minimum propeller pitch angle to angle, determine the propeller pitch angle of blade.The program is identical by data mining, contrast Unit each operational factor in different operating mode lower blade stall and normal operation, the characteristic value of unit normal operation is extracted, and As control Rule of judgment and threshold value, dynamic adjusts blade pitch angle, so as to eliminate blade stall phenomenon, improves blade and inhales Call prisoners in after letting them out for exercise can ability, improve the power curve of unit.Above-mentioned technical proposal is not increasing the bar of unit fatigue load and ultimate load Under part, generating efficiency of the unit in life cycle is improved.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing In, identical reference symbol represents identical part.
Fig. 1 is the wind generator set blade aerofoil profile angle of attack schematic diagram of embodiments of the invention;
Fig. 2 is the blade aerodynamic performance of embodiments of the invention and the graph of a relation of the angle of attack;
Fig. 3 is the control method flow chart of the wind power generating set propeller pitch angle of embodiments of the invention one;
Fig. 4 is the acquisition flow chart of the maximum reference value of the wind angle of embodiments of the invention two;
Fig. 5 is wind speed-wind direction standard deviation scatter diagram when the stall of embodiments of the invention two is abnormal, stall is normal;
Fig. 6 is the wind power generating set real output comparison diagram of embodiments of the invention three;
Fig. 7 is the functional block diagram of the control device of the wind power generating set propeller pitch angle of embodiments of the invention four;
Fig. 8 is the functional block diagram of the control device of the wind power generating set propeller pitch angle of embodiments of the invention five;
Fig. 9 is the control system Organization Chart of the wind power generating set propeller pitch angle in the wind power plant of embodiments of the invention six.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing forms the application part, and It is used for the principle for explaining the present invention together with embodiments of the present invention.
In general, for unit in Man Faqian, blade pitch angle (i.e. minimum propeller pitch angle, be also optimal propeller pitch angle) is fixed 's.The present invention contrasts the stall and just under different operating modes of identical unit by being recorded to unit actual motion transient data Often each operational factor during operation, by extracting unit operation characteristic value, control signal being generated, dynamic adjusts blade pitch angle, from And blade stall phenomenon is eliminated, improving blade absorbs wind energy ability, improves the power curve of unit.
The purpose of the present invention is in the case of no additionally raising concentrfated load, improves power of the assembling unit curve, improves machine Group generated energy.In this application, wind-driven generator is in the case of blade stall, according to live wind regime, adjust automatically blade oar Elongation, the power output of unit is improved, optimize power curve.
Before each embodiment is described, the angle of attack of first choice description blade and its relation between blade aerodynamic performance.Fig. 1 It is wind generator set blade aerofoil profile angle of attack schematic diagram provided in an embodiment of the present invention.In Fig. 1, reference 7 is vane airfoil profile The string of a musical instrument in cross section, reference 8 are impeller Plane of rotation, and reference 9 is to act on the relative wind velocity direction of blade.Wind-force The blade inflow angle Φ of generating set is the angle between the relative wind velocity direction 9 of blade and impeller Plane of rotation 8.Φ=alpha+beta; Wherein, α is the angle of attack, and β is minimum propeller pitch angle.In general, for unit in Man Faqian, blade minimum propeller pitch angle β (be also optimal pitch Angle) it is fixed.In same wind field, because the arrangement position of blower fan is different, the wind at synchronization, each blower fan seat in the plane point A certain degree of difference be present in speed, turbulence intensity and blade inflow angle.Corresponding blade is attacked when what a was represented is blade stall exception Angle maximum reference value, what b was represented is the blade pitch angle of the adjustment needed.
Fig. 2 is the graph of a relation of blade aerodynamic performance provided in an embodiment of the present invention and the angle of attack.Cl is blade in Fig. 2 ordinates Lift coefficient, Cd is the resistance coefficient of blade, and what Cl/Cd was characterized is the aeroperformance of blade.Cl/Cd ratios are bigger, show The aeroperformance of blade is better, and the wind energy that identical wind friction velocity lower blade absorbs is more;Conversely, blade aerodynamic performance is poorer.Such as Shown in Fig. 2, Cl/Cd values and attack angle of blade α are closely related, and within the specific limits, angle of attack is bigger, and blade aerodynamic performance is better, when After angle of attack exceedes a certain scope (such as 10~15 degree), the aeroperformance of blade drastically declines, and blade stall occurs.Unit leaf When piece normal operation, stall condition be present in blade root certain limit, have no effect on the output of blower fan normal power, this kind It is normal that operating mode is referred to as blade stall;If above-mentioned stall region expands to blade tip direction, the lift of blade is caused drastically to decline, Resistance rises, and power of the assembling unit output reduces, and this kind of operating mode is referred to as blade stall exception.
Embodiment one
Fig. 3 is the control method flow chart of the wind power generating set propeller pitch angle of embodiments of the invention one, as shown in figure 3, It comprises the following steps:
Step 310:Obtain power output of the wind power generating set in Man Faqian changeover portion;
Step 320:When the power output occurs abnormal, according to wind angle during the blade stall exception being obtained ahead of time most The maximum reference value of wind angle and initial minimum propeller pitch angle when restricted publication of international news and commentary entitled value, blade stall are normal, determine the propeller pitch angle of blade.
Wherein, it is a variety of to judge that the whether abnormal method of power output has, such as by entering with default calibration power threshold value Row compares, or, the output power curve of the changeover portion and default output power curve are compared to determine, Huo Zhegen Judge according to the relation between power output and wind speed.
Wherein, the maximum reference of wind angle when the maximum reference value of wind angle, blade stall are normal during blade stall exception Value can be set previously according to empirical data, or obtained according to data digging methods such as machine learning.
This method is in the changeover portion power output exception before completely being sent out when unit, energy adjust automatically blade pitch solution, to carry The power output of high unit, optimize power curve.
Embodiment two
Fig. 4 is the acquisition flow chart of the maximum reference value of the wind angle of embodiments of the invention two.As shown in figure 4, it is wrapped Include following steps:
Step 410:The value and wind speed information of multiple wind angles are gathered in first time period;
Step 420:According to the value of multiple wind angles and the wind speed information, wind speed-wind direction standard deviation scatter diagram is generated;
Step 430:In wind speed-wind direction standard deviation scatter diagram, one reference perpendicular to wind direction standard deviation axle of generation is straight Line so that the data point in preset range is located at below the reference straight line, and according to the wind vane with reference to line correspondences Quasi- difference determines wind angle maximum reference value.
Citing illustrates below:
In general blade blade root position when unit operation can all have the stall of certain area, but this is normal , if the scope of stall expands, referred to as stall is abnormal, can so cause power output to reduce.Due to needing exclusion one Abnormal point under a little special operation conditions, when choosing a or a ', it can be ensured that 90% point is within the range.
(strong wind unit can completely be sent out) in extreme circumstances, a and a' can be calculated by the data mining analysis of a day data, In general, it is necessary to which 1 month data, sends out on condition that unit can expire in this period.A, substantially need not be more after a' is determined Newly, because a local wind direction is all more stable from the point of view of annual average data.
Fig. 5 is wind speed-wind direction standard deviation scatter diagram when the stall of embodiments of the invention two is abnormal, stall is normal.It is i.e. same The same unit of one wind field wind speed-wind direction in different time sections intra vane stall abnormal (circle) and blade stall normal (asterisk) Standard deviation scatter diagram.Referring to Fig. 5, in wind speed-wind direction standard deviation scatter diagram, wind direction standard deviation axle draws straight line so that More than 60%-90% point is all below this straight line, and here exemplified by 90%, the wind direction standard deviation value of this line correspondences is true It is set to wind angle maximum reference value.In Figure 5, this wind direction standard deviation value is 20, because Fig. 5 longitudinal axis is 10 times of amplifications, Again divided by 10, it is 2, wind angle maximum reference value a' when as blade stall is normal.In addition, it can be seen that in Figure 5, most of leaf The abnormal data point distribution of piece stall below 12, is joined in wind direction standard deviation it therefore follows that wind angle is maximum during blade stall exception Value a is examined as 1.2.
Embodiment three
The present embodiment carries out further refinement description to step 320 in Fig. 3, when it is implemented, can be in the following way:
When the maximum reference value of wind angle, blade stall are normal during to blade stall exception the maximum reference value of wind angle and Initial minimum propeller pitch angle three sum carries out rounding processing, to determine the propeller pitch angle of blade;Or
When the maximum reference value of wind angle, blade stall are normal during to blade stall exception the maximum reference value of wind angle and Any two value summed after rounding processing with the 3rd value in initial minimum propeller pitch angle three, to determine the pitch of blade Angle.
Specifically, it is above-mentioned to round processing and may include:Round processing, rounding up handles or rounds place downwards Reason.
It is preferred that the propeller pitch angle of blade is determined based on below equation:B=round (a+a')+b0, wherein, round tetra- House five enters bracket function, b0It is generating set initially minimum propeller pitch angle, the maximum of wind angle, a' when a is blade stall exception For the maximum reference value of blade stall wind angle when normal.
It is illustrated below:
Example 1:
B=round (a+a')+b0, round is round function;Predefine:A=1.2 degree, a'=2 degree, b0=1 degree;Propeller pitch angle after adjustment is:B=round (1.2+2)+1=4 degree.When initial propeller pitch angle is 0.5 degree, b=3.5 Degree.
Example 2:
B=round (a+a'+b0);As a=1.2 degree, a'=2 degree, b0At=1 degree, b=4 degree;As a=1.2 degree, a'= 2 degree, b0At=0.5 degree, b=4 degree.For the formula compared with formula in example 1, as a result difference will not be very big, at most 0.5 degree, can connect By in the range of, because becoming oar resolution ratio has 0.2 degree.
Example 3:
B=floor (a+a')+b0;As a=1.2 degree, a'=2 degree, b0At=1 degree, b=4 degree;As a=1.2 degree, a'= 2 degree, b0At=0.5 degree, b=3.5 degree.Wherein, floor is downward bracket function.
Example 4:
B=ceil (a+a'+b0);As a=1.2 degree, a'=2 degree, b0At=1 degree, b=5 degree;As a=1.2 degree, a'=2 Degree, b0At=0.5 degree, b=4 degree.Wherein, ceil is the function that rounds up.
Example 5:
B=floor (a+a')+b0+0.5;As a=1.2 degree, a'=2 degree, b0At=1 degree, b=4.5 degree;Work as a=1.2 Degree, a'=2 degree, b0At=0.5 degree, b=4 degree.Error can further be corrected by the formula.
Fig. 6 is wind power generating set real output comparison diagram provided in an embodiment of the present invention.Curve 12 is using this Unit output power curve before inventive method, curve 11 are guarantee power curve, and curve 10 is to employ the inventive method The power curve of unit output afterwards.It can be seen that after employing method of the invention, the power of unit output is more nearly load Power is protected, substantially eliminates sinking for output power curve before full hair.
Example IV
Embodiments of the invention four provide a kind of control device of wind power generating set propeller pitch angle.As shown in fig. 7, the device 700 include:
Acquisition module 710, for obtaining power output of the wind power generating set in Man Faqian changeover portion;
Judge module 720, for judging whether the power output exception occurs;
Processing module 730, for when power output occur it is abnormal when, according to wind direction during the blade stall exception being obtained ahead of time The maximum reference value of wind angle and initial minimum propeller pitch angle when the maximum reference value at angle, blade stall are normal, determine the oar of blade Elongation.
The control device can be adjusted when the power output of Man Faqian changeover portion occurs abnormal to propeller pitch angle, with In the case where the inflow angle of blade keeps constant, the purpose for reducing attack angle of blade can be reached, increase blade lift, make blade Stall recovery area.
Embodiment five
As shown in figure 8, in the present embodiment, the control device of wind power generating set propeller pitch angle can also further comprise:
Acquisition module 810, for gathering the value and wind speed information of multiple wind angles in first time period;
Graphics module 820, for the value according to multiple wind angles and the wind speed information, generate wind speed-wind direction standard deviation Scatter diagram;
Determining module 830, in wind speed-wind direction standard deviation scatter diagram, generation one to be perpendicular to wind direction standard deviation axle Reference straight line so that data point in preset range with reference to below straight line, and refers to line correspondences positioned at described according to described Wind direction standard deviation value determine wind angle maximum reference value.
Specifically, the judge module 720, specifically may include:
First judging submodule 721, for being more than or equal to the 5% of guarantee power less than the value of guarantee power when power output When, it is abnormal to be judged as that power output occurs;Or
Second judging submodule 722, for periodically obtaining the power output and wind speed of wind power generating set, according to obtaining Power output and wind speed curve, it is determined whether occur for power output abnormal.
Specifically, the processing module 730 may include:
First processing submodule 731, for when above-mentioned power output occurs abnormal, wind angle during to blade stall exception Maximum reference value, blade stall it is normal when wind angle maximum reference value and initial minimum propeller pitch angle three sum rounded Processing, to determine the propeller pitch angle of blade;Or
Second processing submodule 732, for when above-mentioned power output occurs abnormal, wind angle during to blade stall exception Maximum reference value, blade stall it is normal when wind angle maximum reference value and initial minimum propeller pitch angle three in any two value Sum with the 3rd value after rounding processing, to determine the propeller pitch angle of blade.
Further, the device may be provided in the master controller of single wind generator group, or be arranged at wind power plant Field controller in.
The course of work of the device will not be repeated here described in preceding method embodiment.
Embodiment six
The present embodiment provides a kind of control system of wind power generating set propeller pitch angle in wind power plant, and refering to Fig. 9, it is wrapped Multiple wind power generating sets and field controller 90 are included, each wind electricity hair unit includes reporting module, for reporting wind-power electricity generation The power output of unit;The control device of any of the above-described is provided with this controller, this controller also includes issuing mould Block, for the propeller pitch angle after determination to be issued into corresponding wind power generating set to carry out real-time propeller pitch angle adjustment.
Fig. 9 is wind power plant team control system schematic provided in an embodiment of the present invention.Traditional wind power generating set control system System, is the independent control that wind power generating set is realized by single controller, the control parameter of every Wind turbine has its right The initial setting answered, after the completion of units' installation debugging, typically it will not again change or be changed according to particular/special requirement;And per independence for Taiwan It is poor in real time that Atmospheric Condition, geographical position condition and individual performance of vertical its position of Wind turbine etc. are all present Different, control parameter can not adapt to the change of these conditions completely.By wind power plant group control system, topological structure is shown in Fig. 1, to wind field The service data of the ambient parameter of each unit, wind-resources parameter and unit, in real time or timing adjusts each unit respectively Control parameter and control strategy, realize the optimal control to the generated output and machine life of whole wind field so that Wind turbine Generated output is more excellent in design safety nargin.
The course of work of the system is described below:
First, to first time period T1Ambient parameter, the wind-resources parameter of interior each wind power generating set of wind field, such as wind To angle, wind speed, power output, and turbulence intensity, it is acquired and records.T1The random time of 24 hours is may be greater than, The accuracy of control parameter increases with T1 increase, it is preferred that T1More than or equal to 1 month.
Then, according to the parameter collected, stall exception wind angle maximum reference value a, wind when stall is normal is calculated It is a ' to the maximum reference value at angle.
Vague generalization is analyzed, and under turbines vane stall abnormal conditions, wind direction standard deviation is less than or equal to S degree, wind direction angle change Scope is-S degree extremely+S degree.Because blade stall is abnormal, therefore the angle of attack becomes big, therefore can determine that now actual wind direction angle is blade In the range of 0~-S degree.Similar, when blade stall is normal, wind direction angle excursion, which is-S ' degree, to be spent to+S ', now blade The angle of attack diminishes, so when wind direction angle be in the range of 0~+S ' degree.
Then, field controller is with a period T2For a cycle, the period is random time section, preferably 10 points Clock.The transient data of unit is utilized within the cycle, obtains the power curve of unit, and judges that unit is particularly in changeover portion It is no stall abnormality occur.When stall abnormality occurs in unit, it is embodied under a certain wind speed section power curve Hang down, power output collapse phenomenon occurs less than guarantee power, power curve.Preferably, when power output is less than guarantee power When value is more than or equal to the 5% of guarantee power, occur for power output abnormal.
Finally, according to obtained a, a' value and minimum propeller pitch angle, it is determined that the propeller pitch angle b after adjustment, propeller pitch angle is adjusted Blade stall recovery area is may be such that to b.Specifically, propeller pitch angle is adjusted to b degree, keeps constant in the inflow angle of blade In the case of, the purpose for reducing attack angle of blade can be reached, increase blade lift, make blade stall recovery area.
The present invention is monitored in real time respectively to every unit in wind power plant, when there is stall exception, passes through logarithm According to statistical analysis processing is carried out, the optimal propeller pitch angle b of every unit in certain circumstances is obtained so that unit can be put rapidly De- stall zone, obtains stable power output.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in, It should all be included within the scope of the present invention.

Claims (10)

  1. A kind of 1. control method of wind power generating set propeller pitch angle, it is characterised in that including:
    Obtain power output of the wind power generating set in Man Faqian changeover portion;
    When the power output occurs abnormal, according to the maximum reference value of wind angle during the blade stall exception being obtained ahead of time, The maximum reference value of wind angle and initial minimum propeller pitch angle when blade stall is normal, determine the propeller pitch angle of blade;Determine blade The step of propeller pitch angle, includes:
    The maximum reference value of wind angle and initial when the maximum reference value of wind angle, blade stall are normal during to blade stall exception Minimum propeller pitch angle three sum carries out rounding processing, to determine the propeller pitch angle of blade;Or
    The maximum reference value of wind angle and initial when the maximum reference value of wind angle, blade stall are normal during to blade stall exception Any two value summed after rounding processing with the 3rd value in minimum propeller pitch angle three, to determine the propeller pitch angle of blade.
  2. 2. according to the method for claim 1, it is characterised in that during blade stall exception the maximum reference value of wind angle or The acquisition pattern of the maximum reference value of wind angle includes when blade stall is normal:
    The value and wind speed information of multiple wind angles are gathered in first time period;
    According to the value of the multiple wind angle and the wind speed information, wind speed-wind direction standard deviation scatter diagram is generated;
    In wind speed-wind direction standard deviation scatter diagram, a reference straight line perpendicular to wind direction standard deviation axle is generated so that default model Data point in enclosing determines wind direction below the reference straight line according to the wind direction standard deviation value with reference to line correspondences Angle maximum reference value.
  3. 3. according to the method for claim 1, it is characterised in that in the transition for obtaining wind power generating set in Man Faqian Also include after the step of power output of section:
    Compare the difference and preset value of guarantee power and power output, it is different according to whether comparative result determination power output occurs Often;Or
    According to the power output and the corresponding relation of wind speed, whether determination power output there is exception.
  4. 4. according to the method described in one of claim 1-3, it is characterised in that described to round processing and include:Round Handle, rounding up handles or round processing downwards.
  5. 5. according to the method for claim 4, it is characterised in that the propeller pitch angle of blade is determined based on below equation:
    B=round (a+a')+b0,
    Wherein, round is round function, b0It is generating set initially minimum propeller pitch angle, when a is blade stall exception The maximum reference value of wind angle, a' are the maximum reference value of wind angle when stall is normal.
  6. A kind of 6. control device of wind power generating set propeller pitch angle, it is characterised in that including:
    Acquisition module, for obtaining power output of the wind power generating set in Man Faqian changeover portion;
    Judge module, for judging whether the power output exception occurs;
    Processing module, for when the power output occur it is abnormal when, according to wind angle during the blade stall exception being obtained ahead of time Maximum reference value, blade stall it is normal when wind angle maximum reference value and initial minimum propeller pitch angle, determine the pitch of blade Angle;
    The processing module includes:
    First processing submodule, for when the power output occurs abnormal, the maximum of wind angle during to blade stall exception The maximum reference value of wind angle and initial minimum propeller pitch angle three sum carry out rounding processing when reference value, blade stall are normal, To determine the propeller pitch angle of blade;Or
    Second processing submodule, for when the power output occurs abnormal, the maximum of wind angle during to blade stall exception Any two value is taken in the maximum reference value of wind angle and initial minimum propeller pitch angle three when reference value, blade stall are normal Summed after whole processing with the 3rd value, to determine the propeller pitch angle of blade.
  7. 7. device according to claim 6, it is characterised in that also include:
    Acquisition module, for gathering the value and wind speed information of multiple wind angles in first time period;
    Graphics module, for the value according to the multiple wind angle and the wind speed information, generate wind speed-wind direction standard deviation scatterplot Figure;
    Determining module, in wind speed-wind direction standard deviation scatter diagram, one reference perpendicular to wind direction standard deviation axle of generation to be straight Line so that the data point in preset range is located at below the reference straight line, and according to the wind vane with reference to line correspondences Quasi- difference determines wind angle maximum reference value,
    The determining module is connected with the maximum reference value acquisition module of the processing module and the wind angle.
  8. 8. device according to claim 6, it is characterised in that the judge module, specifically include:
    First judging submodule, for when power output is more than or equal to the 5% of guarantee power less than the value of guarantee power, judging Occur for power output abnormal;Or
    Second judging submodule, for periodically obtaining the power output and wind speed of wind power generating set, according to obtained output The curve of power and wind speed, it is determined whether occur for power output abnormal.
  9. 9. according to any one of the claims 6-8 device, it is characterised in that the device is arranged on single wind generator group Master controller in, or be arranged in the field controller of wind power plant.
  10. 10. the control system of a kind of wind power generating set propeller pitch angle in wind power plant, it is characterised in that sent out including multiple wind-force Group of motors and field controller, each wind electricity hair unit includes reporting module, for reporting the power output of wind power generating set; The device according to any one of the claims 6-8 is provided with the field controller, the field controller also includes issuing Module, for the propeller pitch angle after the determination to be issued into corresponding wind power generating set to carry out real-time propeller pitch angle adjustment.
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