CN106121914A - The closing method of blower fan and system under extremity - Google Patents
The closing method of blower fan and system under extremity Download PDFInfo
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- CN106121914A CN106121914A CN201610743236.3A CN201610743236A CN106121914A CN 106121914 A CN106121914 A CN 106121914A CN 201610743236 A CN201610743236 A CN 201610743236A CN 106121914 A CN106121914 A CN 106121914A
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- oars
- wind wheel
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Classifications
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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
-
- 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
- F05B2270/327—Rotor or generator speeds
-
- 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
- F05B2270/40—Type of control system
- F05B2270/404—Type of control system active, predictive, or anticipative
-
- 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
Abstract
The invention provides closing method and the system of blower fan under extremity, relate to air-blower control field.Method provided herein; use the mode becoming speed of putting away the oars; when fitful wind shuts down beginning; first with height put away the oars speed adjust wind wheel propeller pitch angle; with the problem avoiding wind wheel that hypervelocity occurs; the propeller pitch angle of wind wheel, the problem excessive to avoid the occurrence of the overall mechanical load of blower fan is adjusted the most again with low speed of putting away the oars.Use this kind of control method, it is possible to make blower fan avoid the occurrence of the situation of hypervelocity driving simultaneously, and it is excessive to avoid the occurrence of blower fan mechanical load, and the situation making blower fan structure rupture, improve blower fan safety in fitful wind stopping process.
Description
Technical field
The present invention relates to air-blower control field, in particular to the closing method of blower fan under extremity and system.
Background technology
Wind energy is a kind of clean type energy, and along with energy shortage and the aggravation of environmental pollution, wind-driven generator is this can
The generating equipment converting wind energy into electric energy receives publicity all the more.
Owing to the wind speed and direction of wind is constantly in variable condition, therefore, two systems of properly functioning needs of blower fan
Controlling, the two system is pitch-controlled system and yaw system respectively.During work, the Main Function of pitch-controlled system is based on wind speed,
The propeller pitch angle of wind wheel blade is adjusted, thus regulates blade and convert wind energy into the efficiency of mechanical energy, and impact generating
Amount；Yaw system then be regulation wind wheel towards so that wind wheel can be directed at wind direction all the time, and then enable wind wheel to greatest extent
Acquisition wind energy.
The operation of blower fan is generally divided into three phases, first stage, detects wind speed in real time, when wind speed reaches to cut wind speed
Time, blade is started to rotate by wind-force effect, and then drives electrical power generators, and the electric energy of generation is conveyed into electrical network.Second
In the stage, regulated propeller pitch angle in real time by pitch-controlled system, so that wind energy utilization maintains in the reasonable scope, to take into account the peace of blower fan
Complete and the generating efficiency of blower fan；Meanwhile, regulated in real time by yaw system wind wheel blade towards, to ensure that wind wheel blade all the time can
Enough it is directed at wind direction.Phase III, wind speed too low or too high time, blower fan puts away the oars, and then out of service, and cuts out electrical network.
The three phases of above-mentioned fan operation is ideally (in the case of wind speed and direction is in gradual change), blower fan
The entire run cycle.But in real work, wind speed and direction is not to be forever in gradual change state, when attacking such as strong gusts of wind, wind
Speed and wind direction are in the state of acute variation, now, in order to ensure the safety of blower fan, need to drive blower fan out of service, and
Blower fan is cut out electrical network.In conventional art, the reply mode taked of strong gusts of wind be put away the oars at full speed (when having put away the oars, chord of blade
Line is substantially parallel with wind direction, and blade is the most no longer rotated by wind energy effect), to ensure the safety of blower fan.But, real work
In, this full speed mode of putting away the oars is unsatisfactory, and pitch-controlled system there will be the biggest extreme loads, even makes blower fan occur that structure is damaged
Wound.
Summary of the invention
It is an object of the invention to provide closing method and the system of blower fan under extremity, to ensure wind speed round not
Can be too high, in the case of blower fan does not has the danger of driving, reduce the mechanical load of various piece of blower fan (such as blade root load, wheel
Hub load etc.) maximum, it is to avoid there is structural damage in blower fan.
First aspect, embodiments provides the closing method of blower fan under extremity, including:
During fan parking, use first put away the oars speed adjust wind wheel blade propeller pitch angle, to reduce wind wheel/generating
The acceleration of machine, and detect the acceleration of current wind wheel/electromotor in real time；
When wind wheel/electromotor acceleration less than preset acceleration rate threshold time, use second put away the oars speed adjust wind wheel
The propeller pitch angle of blade, the first speed of putting away the oars is put away the oars speed more than second.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, wherein, step
Suddenly the second propeller pitch angle putting away the oars speed adjustment wind wheel blade is used to include:
Acceleration calculation according to wind wheel/electromotor second is put away the oars speed, when the acceleration of wind wheel/electromotor is for time negative,
The absolute value of the acceleration of wind wheel/electromotor is negative correlation with speed of putting away the oars；
Use calculated second put away the oars speed adjust wind wheel blade propeller pitch angle.
In conjunction with first aspect, embodiments provide the embodiment that the second of first aspect is possible, wherein, root
Include according to the acceleration calculation second of wind wheel/electromotor speed of putting away the oars:
Calculate second according to equation below to put away the oars speed；
When a ∈ (-0.04,0] time, ω=2.75a+0.13；
When a ∈ (-0.1 ,-0.04] time, ω=0.2a+0.028；
When a ∈ (-0.16 ,-0.1] time, ω=0.004a+0.0084；
Wherein, a is the acceleration of wind wheel, and unit is rad/s2, ω is second to put away the oars speed, and unit is rad/s.
In conjunction with first aspect, embodiments provide the third possible embodiment of first aspect, wherein, be somebody's turn to do
Method also includes:
In blower fan normal course of operation, if the rotating speed of wind wheel/electromotor is at the first rotational speed limit and the second rotational speed limit
Between, pitch rate instruction is negative, and meets any one in following two condition simultaneously, then perform step and use first to put away the oars
Speed adjusts the propeller pitch angle of wind wheel blade；The rotating speed of wind wheel/electromotor continues to increase, and the acceleration of ambient wind velocity is just.
In conjunction with first aspect, embodiments provide the 4th kind of possible embodiment of first aspect, wherein, be somebody's turn to do
Method also includes:
If the rotating speed of wind wheel/electromotor is more than the second rotational speed limit, and the rotating speed of wind wheel/electromotor continues to increase, and
Wind speed continues to increase, then perform step use first put away the oars speed adjust wind wheel blade propeller pitch angle.
Second aspect, the embodiment of the present invention additionally provides the shutdown system of blower fan under extremity, including:
First puts away the oars control module, for during fan parking, uses the first speed of putting away the oars to adjust wind wheel blade
Propeller pitch angle, to reduce the acceleration of wind wheel/electromotor；
Detection module in real time, for the acceleration of the current wind wheel/electromotor of detection in real time；
Second puts away the oars control module, for when the acceleration of wind wheel/electromotor is less than the acceleration rate threshold preset, using
Second speed of putting away the oars adjusts the propeller pitch angle of wind wheel blade, to control the absolute value of the angle of attack of wind wheel blade less than the limit value preset,
First speed of putting away the oars is put away the oars speed more than second.
In conjunction with second aspect, embodiments provide the first possible embodiment of second aspect, wherein,
Two control modules of putting away the oars include:
Second puts away the oars rate calculation unit, for putting away the oars speed according to acceleration calculation second, when acceleration is for, time negative, adding
The absolute value of speed is negative correlation with speed of putting away the oars；
Propeller pitch angle regulation unit, for use calculated second put away the oars speed adjust wind wheel blade propeller pitch angle.
In conjunction with second aspect, embodiments provide the embodiment that the second of second aspect is possible, wherein, be somebody's turn to do
System also includes the first fitful wind judge module, in blower fan normal course of operation, when the rotating speed of wind wheel/electromotor is first
Between rotational speed limit and the second rotational speed limit, pitch rate instruction is negative, and meets any one in following two condition simultaneously
Time, drive first put away the oars control module work；The acceleration of wind wheel/electromotor is just, the acceleration of ambient wind velocity is just.
In conjunction with second aspect, embodiments provide the third possible embodiment of second aspect, wherein, be somebody's turn to do
System also includes the second fitful wind judge module, in blower fan normal course of operation, when the rotating speed of wind wheel/electromotor is more than the
Two rotational speed limits, and the acceleration of wind wheel/electromotor is just, and the acceleration of ambient wind velocity is timing, drives first to put away the oars
Control module works.
The closing method of blower fan under the extremity that the embodiment of the present invention provides, uses when fitful wind is shut down, and adjusts to become and receives
The mode of oar speed regulates propeller pitch angle, uses the mode put away the oars at full speed to regulate the oar of wind wheel blade all the time in prior art
Elongation so that propeller pitch angle is regulated the speed too fast, when causing propeller pitch angle to be adjusted to a certain degree, the angle of attack of wind wheel blade reversely increases
Greatly, finally make the reverse aerodynamic moment suffered by wind wheel increase sharply, the machine of the positions such as the blade root of blower fan, hub centre can be caused
Tool load exceedes design load, causes blower fan structure damage to compare, during it is by shutting down at fitful wind, first uses higher
Speed of putting away the oars adjusts the propeller pitch angle of wind wheel blade, to reduce the acceleration of wind wheel/electromotor faster, and detects wind in real time simultaneously
The acceleration of wheel/electromotor, when the acceleration of wind wheel/electromotor is sufficiently small when, just explanation wind wheel is super substantially without occurring
The situation of speed, regulates the propeller pitch angle of wind wheel blade so that attack angle of blade will not be anti-the most again by slower speed of putting away the oars
Excessive to increase, it is to avoid during fan parking, the structural damage that causes.
Further, embodiments provide and calculate the second mode putting away the oars speed, use calculate second to put away the oars
Speed can the most accurate by wind wheel Acceleration Control less than 0, and close in the range of 0, within the range, blower fan
Mechanical load will not be too high, and has taken into account the total duration shut down.
Meanwhile, the embodiment of the present invention on the basis of the closing method of blower fan, additionally provides and judges whether under extremity
The two ways of fitful wind occurs, and both modes are respectively by the rotating speed of wind wheel/electromotor, and change, ambient wind velocity and change
Oar rate instruction judges whether there occurs fitful wind, and by the rotating speed of wind wheel/electromotor, and change, ambient wind velocity are sentenced
Disconnected whether there occurs fitful wind, improve promptness and accuracy that fitful wind judges, and this fitful wind judgment mode and aforementioned fitful wind
The process shut down combines, it is possible to reduces the risk of blower fan driving further and reduces the risk of blower fan structure damage.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this
A little accompanying drawings obtain other relevant accompanying drawings.
Fig. 1 shows the basic flow sheet of the closing method of blower fan under the extremity that the embodiment of the present invention is provided；
Fig. 2 shows that under the extremity that the embodiment of the present invention is provided, the specific implementation process of the closing method of blower fan is shown
It is intended to；
Fig. 3 shows that the use tradition constant speed that the embodiment of the present invention is provided is put away the oars mode, and uses provided herein
Speed change put away the oars mode propeller pitch angle change comparison diagram；
Fig. 4 shows that the use tradition constant speed that the embodiment of the present invention is provided is put away the oars mode, and uses provided herein
Speed change put away the oars mode blade root at Mz load change comparison diagram；
Fig. 5 shows that the use tradition constant speed that the embodiment of the present invention is provided is put away the oars mode, and uses provided herein
Speed change put away the oars the wheel hub Myz load change comparison diagram of mode；
Fig. 6 shows that the use tradition constant speed that the embodiment of the present invention is provided is put away the oars mode, and uses provided herein
Speed change put away the oars the change in torque comparison diagram of pitch motor of mode；
Fig. 7 shows the basic block diagram of the shutdown system of blower fan under the extremity that the embodiment of the present invention is provided.
Detailed description of the invention
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Generally exist
Can arrange and design with various different configurations with the assembly of the embodiment of the present invention that illustrates described in accompanying drawing herein.Cause
This, be not intended to limit claimed invention to the detailed description of the embodiments of the invention provided in the accompanying drawings below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, broadly falls into the scope of protection of the invention.
Blower fan is changed into stopped status halt mode by general work state has two kinds, separately below to both shutdown sides
Formula carries out brief introduction.
The first halt mode: (refer to that wind speed and direction will not occur acutely to become in the case of natural environment is relatively stable
Change), the propeller pitch angle of wind wheel blade can adjust in real time according to wind speed, and in the case of invariable power, the biggest propeller pitch angle of wind speed is more
Greatly, the least propeller pitch angle of wind speed is the least.Triggering after wind speed is reached capacity numerical value by regime values and shut down, propeller pitch angle will be from 0 °
(being also likely to be other angles) starts regulation and is gradually increased and is finally adjusted to 90 °, the when that propeller pitch angle being adjusted to 90 °, and blade
The area of windward side minimum, blower fan the most just completes shutdown.
The second halt mode: (when referring to that fitful wind occurs, wind speed and direction is in the case of natural environment instability
In the case of acute variation), now pitch-controlled system there will be serious hysteresis quality to the control of propeller pitch angle, such as the oar of pitch-controlled system
The adjustment of elongation regulating command does not catches up with the change of wind speed, the adjustment of actual blade pitch Angle Position does not catches up with propeller pitch angle regulating command
Adjust, cause actual blade pitch angle and wind speed grave fault, and then it is too high to cause blade to absorb the efficiency of wind energy, ultimately results in generating
Machine rotating speed is too high, if now blower fan continues to run with it is possible to the risk of driving can be caused.
For above-mentioned the second halt mode, in order to avoid the generation of runaway condition.In correlation technique, it will usually take complete
The mode that speed is put away the oars is to adjust the propeller pitch angle of blade, to reduce the windward side of wind wheel blade as early as possible, then reduces blade and absorbs wind
The efficiency of energy, and finally generated output decreases up to off-grid shutdown.But in practical operation, inventor finds, if used at full speed
The mode put away the oars is to regulate the propeller pitch angle of blade, and before shutdown, blower fan is in the state that wind speed round is big and propeller pitch angle is little.Due to
Wind speed increase quickly, wind vector violent so that after halt instruction sends, wind speed, yaw error continue increase, this causes stopping
In 3s～the 5s time after machine instruction generation, the machinery load of the blower fans such as blade root load Mz, hubload Myz and pitch motor moment of torsion
Lotus there will be great numerical value, and now, blower fan is the most in the hole.
For above-mentioned situation, this application provides the closing method of blower fan under extremity, as shown in Figure 1, it is shown that this
The basic flow sheet of the method that application is provided, comprises the steps.
S101, during fan parking, use first put away the oars speed adjust wind wheel blade propeller pitch angle, to reduce wind
The acceleration of wheel/electromotor, and detect the acceleration of current wind wheel/electromotor in real time；
S102, when wind wheel/electromotor acceleration less than preset acceleration rate threshold time, use second put away the oars speed adjust
The propeller pitch angle of wind wheel blade；Wherein, the first speed of putting away the oars is put away the oars speed more than second.
Visible, the emphasis of closing method provided herein exists: after entering fitful wind shutdown mode, by first using number
Higher the first speed of putting away the oars of value, to regulate propeller pitch angle, reduces the acceleration of wind wheel, it is ensured that blower fan will not exceed the speed limit；Then, then
Use numerical value relatively low second is put away the oars rate adaptation propeller pitch angle, so that each mechanical load will not occur numerical value in stopping process
Too high, and cause safety check to pass through, or the problem that blade damage, driving occur.
First below the stopping process after entering fitful wind shutdown mode is illustrated.From the point of view of specifically, extreme shape is occurring
During condition (when occurring such as fitful wind), becoming suddenly big due to wind-force, the acceleration of wind wheel can increase moment, the rotating speed of wind wheel in the short time
Will improve, now blower fan just has the risk of driving.In order to avoid the rotating speed of wind wheel is too fast, step S101 first should be performed,
I.e. with speed of putting away the oars faster (such as speed of putting away the oars at full speed, or rate controlled of putting away the oars is at 5 °/S-8 °/S) regulation propeller pitch angle, with fall
The acceleration of low wind wheel/electromotor, until the acceleration of wind wheel decrease below default acceleration rate threshold (acceleration rate threshold
Numerical value, so that the situation that wind wheel does not haves hypervelocity driving is as the criterion, can be arranged near 0 by acceleration rate threshold, preferably will add
Threshold speed is set to 0), now, attack angle of blade is close to 0 °.If but according to traditional halt mode, the most always with comparatively fast
Rate adaptation propeller pitch angle of putting away the oars then eventually result in attack angle of blade much smaller than 0 °, and then make the reverse aerodynamic moment that blade bears
Excessive, make mechanical load (such as load, blade root at blade loading, blade pitch device moment of torsion, pitch motor current value, person's hub centre
The load at place) too high, this directly can cause rupturing between wheel hub and blade, or other mechanical damages occur.Because
This, in method provided herein, ensure wind speed round will not too high on the premise of (that is, the acceleration of wind wheel/electromotor
Less than the acceleration rate threshold preset, as acceleration quickly adjusted to close to 0 or when be slightly less than 0), just use low putting away the oars
The mode of speed regulates propeller pitch angle, so that the absolute value of attack angle of blade is constantly in lesser extent, and then makes mechanical load
Will not be too high, it is to avoid the problem that blower fan structure damage occurs.
It should be noted that in the execution condition of step S102, the acceleration of wind wheel is by the measuring and calculating unit interval
Obtain after velocity variations amplitude.When implementing, the speed of wind wheel/electromotor can be detected in real time, and use the meter preset
Calculation method (such as steepest differentiation, filtering algorithm) calculates the acceleration of wind wheel.Owing to wind wheel and electromotor are to pass through driving-chain
Connect, therefore, wind wheel and generator parameter (such as acceleration, speed etc.) can convert, i.e. obtain wind wheel speed or
Any one in alternator speed the two parameter can calculate the acceleration of wind wheel.Further, due to wind wheel speed and send out
Motor speed can convert, and the most only uses the parameter (speed and acceleration) of wind wheel to illustrate, but it should
Being appreciated that, the protection domain of this patent contains the situation that alternator speed replaces with wind wheel speed too.
In concrete operations, when fitful wind occurs, two stage putting away the oars can be carried out, to ensure that wind wheel will not exceed the speed limit, avoid
While driving, the ultimate value also making mechanical load will not be too high.
First stage, when fitful wind shuts down beginning, usual wind speed round is too high, and first blower fan should put away the oars with faster first
Speed (such as speed of putting away the oars at full speed) is put away the oars, so that the acceleration of wind wheel is dropped quickly to safety value (as acceleration drops to 0
Near).During Gai, the propeller pitch angle of wind wheel blade becomes big with speed faster, and the angle of attack of blade quickly diminishes, and this makes blade
The aerodynamic moment being subject to quickly diminishes, until the angle of attack of blade connects the when of being positioned near 0 degree, (now the acceleration of blower fan is positioned at
Near 0, or it is slightly less than 0) till.Now, although the aerodynamic moment direction that wind wheel is subject to is identical with wind wheel direction of rotation, but gas
Electromagnetic torque that kinetic moment is provided less than generator end, blower fan starts to do retarded motion, it is to avoid blower fan hypervelocity.
Second stage, and when the acceleration of wind wheel blade is sufficiently small when (if acceleration is near 0, especially acceleration
Less than 0, and during close to 0), begin with relatively low speed of putting away the oars to regulate propeller pitch angle, to be controlled by the pneumatic angle of attack of blade
Near 0 °, make the mechanical load will not be too high.Obtain it should be noted that cannot directly measure due to the pneumatic angle of attack, therefore, can
To use the acceleration of wind wheel to characterize the pneumatic angle of attack of blade.It is concrete, the when of when acceleration etc. 0 or close to 0, so that it may
To begin with relatively low speed of putting away the oars to regulate propeller pitch angle.Described herein relatively low speed of putting away the oars (second put away the oars speed) can
To be constant, it is also possible to be variate.When relatively low speed of putting away the oars is variate, it is possible to use the acceleration of wind wheel is as because becoming
Amount, calculates this speed of putting away the oars.During calculating, when the acceleration of wind wheel is timing, the acceleration of wind wheel and second put away the oars speed in
Positive correlation, or when the acceleration of wind wheel is timing, still carry out the tune of propeller pitch angle according to the speed of putting away the oars of speed
Joint；When the acceleration of wind wheel is for time negative, the absolute value of the acceleration of wind wheel and second speed of putting away the oars is negative correlation.Simple next
Say, it is simply that the acceleration of wind wheel is for time negative, and the acceleration of wind wheel is closer to 0, and speed of putting away the oars is the highest；The acceleration of wind wheel exhausted
The biggest to value (i.e. the acceleration of wind wheel further away from 0), speed of putting away the oars is the lowest.This kind of control mode can make the acceleration of wind wheel blade
Degree is held at less than 0, and close in the range of 0.
Preferably, (will the Acceleration Control of wind wheel exist to the angle of attack of blade be more accurately controlled near 0 °
Less than 0, and close to the scope of 0), the most accurate calculation can be used to calculate second and to put away the oars speed.The meter used
Calculation method has piecewise linear interpolation method, repeatedly function method and look-up table etc., below, include use piecewise linear interpolation method and calculate
Second computing formula putting away the oars speed.I.e. when the acceleration of wind wheel is for time negative, second can be calculated as follows and put away the oars speed
Rate, and the propeller pitch angle of speed adjustment blade of putting away the oars according to second calculated:
When a ∈ (-0.04,0] time, ω=2.75a+0.13 formula 1；
When a ∈ (-0.1 ,-0.04] time, ω=0.2a+0.028 formula 2；
When a ∈ (-0.16 ,-0.1] time, ω=0.004a+0.0084 formula 3；
Wherein, a is the acceleration of wind wheel, and unit is rad/s2, ω is second to put away the oars speed, and unit is rad/s.When a is little
In-0.16 time, the second of its correspondence speed of putting away the oars is too low, therefore no longer can calculate second according to the acceleration of wind wheel and put away the oars
Speed, and use constant value to put away the oars speed as second, as put away the oars, speed can be constant for 0.003rad/s.
More specifically, in practical operation, when occurring due to fitful wind, the rotating speed of wind wheel is not necessarily in superfast,
And the first stage the most not necessarily uses the mode of constant speed regulation to adjust the propeller pitch angle of wind wheel blade.Therefore it provides below
Three kinds of control modes:
The first, when fitful wind occurs, if wind speed round too high (reaching 1.05-1.1 times of rated speed, the highest),
Now should put away the oars the most at full speed (speed of putting away the oars commonly reaches 7 °/S-8 °/S), will not raise further controlling wind speed round, keep away
Exempt from wind speed round too fast initiation driving.Along with the adjustment of propeller pitch angle, wind wheel acceleration is gradually reduced that (acceleration is down to relatively low journey
Degree, as being reduced near 0, or time lower), blower fan has avoided the danger of hypervelocity driving.Now, in order to avoid wind wheel
Reverse aerodynamic moment excessive, the blade causing wind wheel is excessive with the intermolecular forces of wheel hub, and causes blade and wheel hub to rupture, should
When using relatively low speed of putting away the oars to adjust propeller pitch angle.Specifically, the speed of wind wheel/electromotor can be detected in real time, and adopt
With default computational methods (such as modes such as steepest differentiation, filtering algorithms) calculate wind wheel acceleration (due to wind wheel with send out
Motor is connected by transmission band, and therefore, the rotating speed of wind wheel and the rotating speed of electromotor can convert, and i.e. obtain the two
Any one in parameter is all feasible).During control, when the acceleration of wind wheel is for bearing, if the acceleration of wind wheel is absolute
It is worth too small, then improves speed of putting away the oars；If too high (the now acceleration direction of wind wheel and the wind wheel of the absolute value of the acceleration of wind wheel
Direction of rotation contrary), then reduce and put away the oars speed, excessive with the reverse pneumatic angle of attack avoiding blade, when the most also avoiding shutting down
Between long and cause other danger.It is furthermore preferred that above-mentioned formula 1-3 can be used to calculate speed of putting away the oars, and according to calculating
The result gone out is to adjust propeller pitch angle.
The second, when fitful wind occurs, if wind speed round slightly higher (reaching 0.95-1.05 times of rated speed), with the first
Unlike control mode, at this point it is possible to do not carry out putting away the oars at full speed, but high speed is put away the oars, and (rate controlled of such as putting away the oars is at 5 °/S-
7°/S).So can the most slowly wind wheel acceleration be decreased below 0, and close to the degree of 0.Afterwards, can be with relatively low
Speed of putting away the oars to control the regulation of blade pitch angle.Specifically, if too high (the now wind wheel of the backward acceleration of wind wheel
Acceleration direction is contrary with the direction of rotation of wind wheel), then reduce speed of putting away the oars；If the backward acceleration of wind wheel is too low, then carry
Height is put away the oars speed.The second way is compared with first kind of way, and when being mainly reflected in fitful wind generation, speed of initially putting away the oars is not
With, due in the second way, when fitful wind occurs, the actual speed of wind wheel and wind speed round ultimate value have certain gap, therefore,
Can not carry out putting away the oars at full speed, so beneficially by wind wheel acceleration more precise control less than 0, and close to the scope of 0.
This main reasons is that, the detection of speed, system-computed (operating speed calculates acceleration), feedback command (comprise speed of putting away the oars
Rate) assign and all may have certain hysteresis quality.If therefore put away the oars at full speed, even if control system has been assigned reduction and put away the oars
The instruction of speed, it is more likely that wind wheel acceleration has been much smaller than 0, such as explanation hereinbefore, now between blade and wheel hub,
The mechanical load of the positions such as blade root is excessive, may over-limit condition.
The third, when fitful wind occurs, in real time using wind wheel acceleration as considering standard, regulate the speed of putting away the oars of wind wheel blade
Rate.Specifically, regulation is put away the oars before speed, first should calculate the acceleration of wind wheel.If the acceleration of the wind wheel calculated surpasses
Cross acceleration upper limit threshold, then should put away the oars at full speed (speed of putting away the oars reaches 7 °/S-8 °/S), so that blower fan will not exceed the speed limit.If
The acceleration of wind wheel between acceleration lower threshold and acceleration upper limit threshold, is then put away the oars with the speed of putting away the oars of higher speed
(rate controlled of putting away the oars is between 5 °/S-7 °/S).If the acceleration of wind wheel, then there is the possible relatively low of hypervelocity in explanation wind wheel,
Now, then should put away the oars with relatively low speed of putting away the oars.No matter with which kind of speed of putting away the oars above-mentioned putting away the oars, all should be at wind
The acceleration of wheel adjusts to less than 0, but close to time in the range of 0, it should use the mode in above-mentioned formula 1-3 first to calculate receipts
Oar speed, is using calculated speed of putting away the oars to regulate propeller pitch angle.
Three of the above control mode, first two regulative mode is relatively simple, it is evident that its stopping process entirety is divided into two
In the stage, be to put away the oars at a high speed the stage and low speed is put away the oars the stage respectively.The second way is for first kind of way, it is possible to control
The change of wind wheel acceleration will not be too fast, it is to avoid the backward acceleration of wind wheel is excessive, the problem causing the too high initiation of mechanical load.
The third control mode is then the advantage having considered first two, is also adopted by changing the side of speed of putting away the oars in the quickly stage of putting away the oars
Formula, is that the process of putting away the oars more relaxes, but the total duration of shutdown also can be made to increase.
When the acceleration of wind wheel is negative, and continue for some time rear (after step S102 performs certain time), turning of wind wheel
Speed have dropped certain degree, and owing to wind speed round is relatively low, now the aerodynamic moment suffered by wind wheel can be far below specified turn
Aerodynamic moment during speed, blower fan will not produce bigger mechanical load.And now the electromagnetic torque of electromotor may be 0,
In order to make wind wheel stop motion as soon as possible, the speed of putting away the oars of blade can be properly increased, quickly to realize impeller aerodynamic brake.Tool
When body performs, speed of putting away the oars when can work as wind speed round close to grid-connected rotating speed (one of safe speed of rotation), can be improved, i.e. with the
Four speed of putting away the oars adjust the propeller pitch angle of wind wheel blade (speed of putting away the oars of the 4th now can be put away the oars at full speed speed, i.e. 7 °/S-
8 °/S), until shutting down.Through reality measuring and calculating, after wind speed round is less than grid-connected rotating speed, improve speed of putting away the oars again, for blower fan
Say safer, but owing to waiting that wind speed round is reduced to the overlong time of grid-connected rotating speed, also just because of overlong time, may
Other safety problems can be caused, it is preferred, therefore, that when wind speed round reaches 60%-80% (safe speed of rotation another of rated speed
A kind of) time, just can improve speed of putting away the oars, to reach the purpose completing to shut down as early as possible.
Further, due in method provided herein, have employed and reduce the mode of speed of putting away the oars and carry out putting away the oars (non-entirely
Speed is put away the oars), therefore meeting downtime proper extension, in actual measurement, due to all uncontrollable factors (as excessive in fitful wind wind-force, wind
Too fast to change, cause wind wheel acceleration to be difficult to be controlled effectively；Generation that and for example control instruction cannot be correct or assign；
And for example under extreme situation, wind wheel/electromotor velometer breaks down and causes calculating the problems such as correct acceleration), in order to
Ensure that blower fan will not exceed the speed limit initiation driving, cause disaster, it should (enter strong gusts of wind to shut down when step S101 starts to perform
Time) start timing, when timing arrives Preset Time (generally could be arranged to 35 seconds-45 seconds), trigger and start emergency shutdown machine
System.I.e. when strong gusts of wind is shut down and arrived 35 seconds-45 seconds, put away the oars speed (such as speed of putting away the oars at full speed, or higher than second with the 3rd
The speed of speed of putting away the oars) so that blower fan can complete to shut down as early as possible.
Above, discuss after entering into fitful wind shutdown mode, the overall process of fan parking.Meanwhile, the most reasonably sentence
Whether disconnected current state has been introduced into gustiness, the most whether should enter fitful wind shutdown mode even more important.Relevant
In technology, wind speed is directly measured in usual employing, or the mode of wind speed round weighs whether current natural environment there occurs battle array
Wind.But wind speed is too fast is not necessarily to there occurs fitful wind, therefore, the judgment mode in correlation technique is inaccurate.
In view of this, this application provides four kinds and judge whether current environment occurs the mode of fitful wind.
First kind of way, in blower fan normal course of operation, system needs to detect in real time the rotating speed of wind wheel/electromotor, with
And obtain pitch rate instruction；
If the rotating speed of wind wheel/electromotor is between the first rotational speed limit and the second rotational speed limit, pitch rate instruction is
Bear (by propeller pitch angle towards 0 ° of regulation), and the acceleration of wind wheel/electromotor is just, then can start fitful wind shutdown mode, i.e. hold
Row step S101；
The second way, in blower fan normal course of operation, system needs to detect the rotating speed of wind wheel/electromotor, ring in real time
Border wind speed, and obtain pitch rate instruction；
If the rotating speed of wind wheel/electromotor is between the first rotational speed limit and the second rotational speed limit, pitch rate instruction is
Bear, and the acceleration of ambient wind velocity is just, then can start fitful wind shutdown mode, i.e. perform step S101；
The third mode, in blower fan normal course of operation, system needs to detect the rotating speed of wind wheel/electromotor, ring in real time
Border wind speed, and obtain pitch rate instruction；
If the rotating speed of wind wheel/electromotor is between the first rotational speed limit and the second rotational speed limit, pitch rate instruction is
Negative, the acceleration of wind wheel/electromotor is just, and the acceleration of ambient wind velocity is just, then can start fitful wind shutdown mode, i.e. hold
Row step S101；
4th kind of mode, in blower fan normal course of operation, system needs to detect in real time rotating speed and the ring of wind wheel/electromotor
Border wind speed；
If the rotating speed of wind wheel/electromotor is more than the second rotational speed limit, and the acceleration of wind wheel/electromotor is just, and
The acceleration of ambient wind velocity is just, then can start fitful wind shutdown mode, i.e. perform step S101.
Wherein, for the 4th kind of mode, it is also possible to increase in Rule of judgment and become whether oar instruction meets the requirements this.
And then, the 4th kind of mode just becomes: in blower fan normal course of operation, system need to detect in real time wind wheel/electromotor rotating speed,
Ambient wind velocity and pitch position instruction；
If the rotating speed of wind wheel/electromotor is more than the second rotational speed limit, and the acceleration of wind wheel/electromotor is just, wind speed
Continue to increase, and the numerical value of pitch position instruction is less than 5 °, then can start fitful wind shutdown mode, i.e. perform step S101.
In above-mentioned four kinds of modes, the first rotational speed limit generally could be arranged to 1.02 times of rated speeds, the second rotational speed limit
1.06 times of rated speeds generally can be set.The judgment accuracy of the third mode and the 4th kind of judgment mode is higher, the first
The judgment accuracy of mode and the second way is relatively low, but needs the data that obtain relatively in the third mode and the 4th in mode
Many, therefore these four mode can select to use in different environments.The acceleration of ambient wind velocity can be according to ambient wind velocity
Being calculated, its calculation is identical with the mode of the acceleration that the rotating speed using wind wheel calculates wind wheel, it is possible to use steepest is micro-
The method such as point-score, filtering algorithm.
Below, with a concrete example, the work of the closing method of blower fan under extremity provided herein is described
Make flow process, refer to accompanying drawing 2,
Step 201, blower fan is in running, and detection fan operation status data (includes turning of wind wheel/electromotor in real time
Speed and pitch rate instruct), and detection ambient wind velocity；
Step 202, the fan operation status data obtained according to detection and ambient wind velocity judge whether should enter by force
Fitful wind shutdown mode；If it is, enter step 203 (starting simultaneously at statistics fitful wind shutdown mode duration), if it does not,
Then return step 201；
Step 203, it is judged that whether current wind wheel acceleration is less than 0；If it is, perform step 204；If it is not, then hold
Row step 205；
Step 204, uses higher speed of putting away the oars (such as speed of putting away the oars at full speed) to put away the oars, so that wind wheel acceleration is as early as possible
Reduce, and perform step 206；
Step 205, uses relatively low speed of putting away the oars to put away the oars, with by wind wheel Acceleration Control less than 0, and close to
In the range of 0, and then avoid the mechanical load of blower fan too high, and perform step 206；
Step 206, it is judged that whether the wind speed round of current blower fan is less than secure threshold (60%-80% rated speed), as
Fruit is, then perform step 208；If otherwise performing step 207；
Step 207, it is judged that fitful wind shutdown mode duration the most long (whether arrive the scheduled time (such as 40 seconds),
If it is, perform step 208；If it is not, then return step 203；
Step 208, puts away the oars in the way of putting away the oars at full speed；
Step 209, completes shutdown of putting away the oars.
As seen in figures 3-6, it is provided that use in correlation technique, under strong gusts of wind state, the method put away the oars at full speed is used to enter
Row is put away the oars and is shut down and use closing method provided herein to carry out the effect contrast figure shut down that puts away the oars.
Fig. 3 shows use both approaches, in fitful wind stopping process, and the situation of change of propeller pitch angle.
Fig. 4 shows use both approaches, in fitful wind stopping process, and the situation of change of Mz load at blade root.
Fig. 5 shows use both approaches, in fitful wind stopping process, and the situation of change of wheel hub Myz load.
Fig. 6 shows use both approaches, in fitful wind stopping process, and the situation of change of the moment of torsion of pitch motor.
Can find out intuitively, after employing method provided herein, the ultimate value of various mechanical loads all obtains
Arrive decline, it is seen then that method provided herein, not only ensured that blower fan will not exceed the speed limit, and ensure the mechanical load of blower fan
Maximum reduce.Improve the safety that blower fan is overall.
The closing method of blower fan under extremity provided herein, meets with, at blower fan, the process that fitful wind carries out shutting down
In, using and change the mode of speed of putting away the oars, the first speed of putting away the oars first using speed higher at the initial stage shut down carries out propeller pitch angle
Regulation, then, the second speed of putting away the oars re-using speed relatively low carries out the regulation of propeller pitch angle, flies ensureing that blower fan will not exceed the speed limit
In the case of car, the mechanical load having taken into account blower fan will not be too high so that blower fan entirety is safer.
Further, the method additionally provides the second accurate calculation (formula 1-3) putting away the oars speed so that using second
During speed of putting away the oars carries out the regulation of propeller pitch angle, controlled more accurately in the range of reasonably in blower fan mechanical load.
Meanwhile, method also provides for the judgment mode judging currently whether there occurs fitful wind.This judgment mode is with front
The change the stated mode that speed carries out shutting down of putting away the oars combines so that it is safer, reasonable that fitful wind is shut down.
Corresponding with the closing method of blower fan under hereinbefore disclosed extremity, the embodiment of the present invention additionally provides
The shutdown system of blower fan under extremity, as it is shown in fig. 7, comprises following structure:
First puts away the oars control module 701, for during fan parking, uses the first speed of putting away the oars to adjust wind wheel blade
Propeller pitch angle, to reduce the acceleration of wind wheel/electromotor；
In real time detection module 702, for putting away the oars during control module 701 work first, detects current wind in real time
The acceleration of wheel/electromotor；
Second puts away the oars control module 703, for when the acceleration of wind wheel/electromotor is less than the acceleration rate threshold preset,
Use second put away the oars speed adjust wind wheel blade propeller pitch angle；Wherein, the first speed of putting away the oars is put away the oars speed more than second.
Preferably, the second control module 703 of putting away the oars includes:
Second puts away the oars rate calculation unit, for putting away the oars speed according to the acceleration calculation second of wind wheel/electromotor, its
In, when the acceleration of wind wheel/electromotor is for time negative, and the absolute value of the acceleration of wind wheel/electromotor is negative correlation with speed of putting away the oars
Property；
Second puts away the oars control unit, for using the calculated second speed of putting away the oars to adjust the propeller pitch angle of wind wheel blade.
Preferably, the second rate calculation unit of putting away the oars is further used for calculating second according to equation below and puts away the oars speed；
When a ∈ (-0.04,0] time, ω=2.75a+0.13；
When a ∈ (-0.1 ,-0.04] time, ω=0.2a+0.028；
When a ∈ (-0.16 ,-0.1] time, ω=0.004a+0.0084；
Wherein, a is the acceleration of wind wheel, and unit is rad/s2, ω is second to put away the oars speed, and unit is rad/s.
Preferably, under this extremity, the shutdown system of blower fan also includes:
Timing module, for from first-hand control module is started time start timing；
3rd puts away the oars control module, for when the timing time of timely module exceedes default time threshold, uses the
Three speed of putting away the oars adjust the propeller pitch angle of wind wheel blade, and wherein, the 3rd speed of putting away the oars is put away the oars speed more than second.
Preferably, under this extremity, the shutdown system of blower fan also includes:
4th puts away the oars control module, for during fan parking, when wind speed round is less than the safe speed of rotation preset,
Then using the 4th speed of putting away the oars to adjust the propeller pitch angle of wind wheel blade, the 4th speed of putting away the oars is put away the oars speed more than second.Wherein, more excellent
Choosing, safe speed of rotation is the rated rotation speed of rotor of 60%-80%.
Preferably, under this extremity, the shutdown system of blower fan also includes:
First fitful wind judge module, in blower fan normal course of operation, when the rotating speed of wind wheel/electromotor is at first turn
Between speed limit value and the second rotational speed limit, pitch rate instruction is negative, and when meeting any one in following two condition, simultaneously
The first control module 701 of putting away the oars is driven to work；The acceleration of wind wheel/electromotor is just, the acceleration of ambient wind velocity is just.
Preferably, under this extremity, the shutdown system of blower fan also includes:
Second fitful wind judge module, in blower fan normal course of operation, when the rotating speed of wind wheel/electromotor is more than second
Rotational speed limit, and the acceleration of wind wheel/electromotor is just, and the acceleration of ambient wind velocity is timing, drives first to put away the oars control
Molding block 701 works.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, the system of foregoing description,
The specific works process of device, module and unit, is referred to the corresponding process in preceding method embodiment, the most superfluous at this
State.
In several embodiments provided herein, it should be understood that disclosed system and method, can be passed through it
Its mode realizes.Device embodiment described above is only schematically, such as, the division of described unit, it is only
A kind of logic function divides, and actual can have other dividing mode when realizing, and the most such as, multiple unit or assembly can be in conjunction with
Or it is desirably integrated into another system, or some features can be ignored, or do not perform.Another point, shown or discussed phase
Coupling between Hu or direct-coupling or communication connection can be the INDIRECT COUPLING by some communication interfaces, device or unit or
Communication connection, can be electrical, machinery or other form.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.
If described function is using the form realization of SFU software functional unit and as independent production marketing or use, permissible
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is the most in other words
The part contributing prior art or the part of this technical scheme can embody with the form of software product, this meter
Calculation machine software product is stored in a storage medium, including some instructions with so that a computer equipment (can be individual
People's computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.
And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory), random access memory are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (10)
1. the closing method of blower fan under extremity, it is characterised in that including:
During fan parking, use first put away the oars speed adjust wind wheel blade propeller pitch angle, to reduce described wind wheel/generating
The acceleration of machine, and detect the acceleration of current wind wheel/electromotor in real time；
When described wind wheel/electromotor acceleration less than preset acceleration rate threshold time, use second put away the oars speed adjust wind wheel
The propeller pitch angle of blade, the described first speed of putting away the oars is put away the oars speed more than described second.
Method the most according to claim 1, it is characterised in that described in step use second put away the oars speed adjust wind wheel blade
Propeller pitch angle include:
Described in acceleration calculation according to described wind wheel/electromotor, second puts away the oars speed, when the acceleration of described wind wheel/electromotor
For time negative, the absolute value of the acceleration of described wind wheel/electromotor is negative correlation with speed of putting away the oars；
Use described calculated second put away the oars speed adjust wind wheel blade propeller pitch angle.
Method the most according to claim 2, it is characterised in that the described acceleration calculation according to described wind wheel/electromotor
Described second speed of putting away the oars includes:
Calculate second according to equation below to put away the oars speed；
When a ∈ (-0.04,0] time, ω=2.75a+0.13；
When a ∈ (-0.1 ,-0.04] time, ω=0.2a+0.028；
When a ∈ (-0.16 ,-0.1] time, ω=0.004a+0.0084；
Wherein, a is the acceleration of wind wheel, and unit is rad/s2, ω is second to put away the oars speed, and unit is rad/s.
Method the most according to claim 1, it is characterised in that also include: put away the oars speed from performing to use described in step first
Rate starts timing when adjusting the propeller pitch angle of wind wheel blade, when the time of described timing exceedes default time threshold, uses the
Three speed of putting away the oars adjust the propeller pitch angle of wind wheel blade, and the described 3rd speed of putting away the oars is put away the oars speed more than described second.
Method the most according to claim 1, it is characterised in that also include: during fan parking, when described wind wheel turns
When speed is less than the safe speed of rotation preset, then using the 4th speed of putting away the oars to adjust the propeller pitch angle of wind wheel blade, the described 4th puts away the oars speed
Rate is put away the oars speed more than described second.
Method the most according to claim 5, it is characterised in that described safe speed of rotation is specified turn of the wind wheel of 60%-80%
Speed.
Method the most according to claim 1, it is characterised in that also include:
In blower fan normal course of operation, if the rotating speed of described wind wheel/electromotor is at the first rotational speed limit and the second rotational speed limit
Between, pitch rate instruction be negative, and meets following two condition simultaneously, then perform employing first described in step and put away the oars speed tune
The propeller pitch angle of rectification campaign impeller blade；The acceleration of wind wheel/electromotor is just, the acceleration of ambient wind velocity is just；
In blower fan normal course of operation, if the rotating speed of described wind wheel/electromotor is more than the second rotational speed limit, and wind wheel/generating
The acceleration of machine is just, and the acceleration of ambient wind velocity is just, then perform to use described in step the first speed of putting away the oars to adjust wind
The propeller pitch angle of impeller blade.
Method the most according to claim 1, it is characterised in that described employing second put away the oars speed adjust wind wheel blade oar
Elongation includes:
Adjust in real time the described second numerical value putting away the oars speed, to control the acceleration of described wind wheel blade less than 0, and close to
In the range of 0.
9. the shutdown system of blower fan under extremity, it is characterised in that including:
First puts away the oars control module, for during fan parking, uses the first speed of putting away the oars to adjust the pitch of wind wheel blade
Angle, to reduce the acceleration of described wind wheel/electromotor；
Detection module in real time, for the acceleration of the current wind wheel/electromotor of detection in real time；
Second puts away the oars control module, for when the acceleration of described wind wheel/electromotor is less than the acceleration rate threshold preset, using
Second speed of putting away the oars adjusts the propeller pitch angle of wind wheel blade, to control the absolute value of the angle of attack of wind wheel blade less than the limit value preset,
Described first speed of putting away the oars is put away the oars speed more than described second.
System the most according to claim 9, it is characterised in that the second control module of putting away the oars includes:
Second puts away the oars rate calculation unit, for putting away the oars speed according to described in described acceleration calculation second, when described acceleration
For time negative, the absolute value of described acceleration is negative correlation with speed of putting away the oars；
Propeller pitch angle regulation unit, for use described calculated second put away the oars speed adjust wind wheel blade propeller pitch angle.
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| CN110594098A (en) * | 2019-09-12 | 2019-12-20 | 华电电力科学研究院有限公司 | Over-speed control method for impeller of wind turbine generator |
| CN113090455A (en) * | 2021-04-25 | 2021-07-09 | 中国华能集团清洁能源技术研究院有限公司 | Method, system and equipment for controlling pitch angle of wind turbine generator set under condition of power failure of power grid |
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