CN108612624B - A kind of method for controlling number of revolution and device of wind-driven generator - Google Patents

A kind of method for controlling number of revolution and device of wind-driven generator Download PDF

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Publication number
CN108612624B
CN108612624B CN201611146529.XA CN201611146529A CN108612624B CN 108612624 B CN108612624 B CN 108612624B CN 201611146529 A CN201611146529 A CN 201611146529A CN 108612624 B CN108612624 B CN 108612624B
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China
Prior art keywords
wind
driven generator
electromagnetic torque
pitch angle
value
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CN108612624A (en
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马磊
李庆江
胡清阳
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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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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/10Purpose of the control system
    • F05B2270/101Purpose of the control system to control rotational speed (n)
    • F05B2270/1011Purpose of the control system to control rotational speed (n) to prevent overspeed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/30Control parameters, e.g. input parameters
    • F05B2270/32Wind speeds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/30Control parameters, e.g. input parameters
    • F05B2270/328Blade pitch angle
    • 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 discloses the method for controlling number of revolution and device of a kind of wind-driven generator, is related to wind power generation field, and wind-driven generator shutdown of overrunning can be damaged caused by wind-driven generator when to solve the problems, such as wind regime mutation.The method for controlling number of revolution of the wind-driven generator, comprising: acquisition wind speed;If wind speed becomes larger, degree is greater than the first default wind speed change threshold, so that the electromagnetic torque of wind-driven generator is kept constant electromagnetic torque value, and increase the target pitch angle value of wind-driven generator, carries out out paddle control with the target pitch angle value after increasing;If detecting, wind speed becomes smaller degree greater than the second default wind speed change threshold, then reduce the electromagnetic torque and propeller pitch angle of wind-driven generator, and electromagnetic torque value is cut out according to the calculating of the real-time revolving speed of wind-driven generator, if the real-time electromagnetic torque value of wind-driven generator is less than predetermined torque threshold value with the difference for cutting out electromagnetic torque value, revolving speed control is carried out according to preset revolving speed-pitch angular dependence and preset revolving speed-electromagnetic torque relationship.

Description

A kind of method for controlling number of revolution and device of wind-driven generator
Technical field
The present invention relates to wind power generation field more particularly to the method for controlling number of revolution and device of a kind of wind-driven generator.
Background technique
In the case where energy shortages at this stage, wind-power electricity generation has been widely used in every field as new energy In.Wind-power electricity generation is that electric energy is converted wind energy into using wind-driven generator, and by the electrical energy transportation converted out into power grid, in turn It is transported to each electrical equipment.
The revolving speed of wind-driven generator in wind power generating set is related to wind-force size, and wind-force can be presented as wind speed, wind speed Bigger, the blade rotation of wind power generating set is faster, drives the revolving speed of wind-driven generator in wind power generating set faster, in order to protect The stabilization of speed for demonstrate,proving wind-driven generator, needs to adjust propeller pitch angle, to adjust the revolving speed of wind-driven generator.Under normal wind regime, wind The variation of speed is slow, and the revolving speed of wind-driven generator rises or falls also relatively slowly, in this case, often utilizes revolving speed Difference-propeller pitch angle PID arithmetic (i.e. rotating speed difference-propeller pitch angle ratio, integrate, differentiate), is calculated by rotating speed difference To suitable propeller pitch angle, tune paddle then is carried out to the blade of wind power generating set.But in wind regime mutation, for example there is fitful wind wind When condition, wind speed can increase suddenly, obtain suitable pitch angle value from according to rotating speed difference-propeller pitch angle PID arithmetic, to according to operation Obtained pitch angle value carries out adjusting this process of paddle, and there are hysteresis qualitys.Quickly due to wind speed variation, according to previous moment operation Obtained pitch angle value has not been suitable for during the tune paddle of later moment in time, can not effectively stable wind-driven generator turn Speed will lead to wind-driven generator and overrun shutdown, it could even be possible to damaging to wind-driven generator.
Summary of the invention
The embodiment of the invention provides a kind of method for controlling number of revolution of wind-driven generator and device, can be avoided because wind-force is sent out Motor is overrun shutdown, to avoid the damage caused by wind-driven generator.
In a first aspect, the embodiment of the present invention provides a kind of method for controlling number of revolution of wind-driven generator, comprising: acquisition wind speed; If wind speed becomes larger, degree is greater than the first default wind speed change threshold, and the electromagnetic torque of wind-driven generator is made to be kept constant electromagnetism Torque value, and increase the target pitch angle value of wind-driven generator, paddle control is carried out out with the target pitch angle value after increasing;If It detects that wind speed becomes smaller degree greater than the second default wind speed change threshold, then reduces the electromagnetic torque and pitch of wind-driven generator Angle, and electromagnetic torque value is cut out according to the calculating of the real-time revolving speed of wind-driven generator, if the real-time electromagnetic torque value of wind-driven generator When being less than predetermined torque threshold value with the difference for cutting out electromagnetic torque value, according to preset revolving speed-pitch angular dependence and preset turn Speed-electromagnetic torque relationship carries out revolving speed control.
With reference to first aspect, in some embodiments, Motionless electromagnetic torque value is to determine that wind speed becomes larger degree greater than first Real-time electromagnetic torque value at the time of default wind speed change threshold.
With reference to first aspect, in some embodiments, paddle control process is being carried out out with the target pitch angle value after increasing In further include: corresponding pitch angle value is calculated according to the real-time revolving speed of wind-driven generator;Increase if corresponding pitch angle value is greater than Target pitch angle value afterwards then continues the target pitch angle value after increasing.
With reference to first aspect, in some embodiments, if detecting, wind speed becomes smaller degree greater than the second default wind speed variation Threshold value, if the step of then reducing the electromagnetic torque and propeller pitch angle of wind-driven generator includes: to detect that the wind speed degree that becomes smaller is greater than the Two default wind speed change thresholds, then respectively reduce the electromagnetic torque and propeller pitch angle of wind-driven generator with pre-set velocity.
With reference to first aspect, in some embodiments, the real-time electromagnetic torque value of wind-driven generator and electromagnetic torque is cut out When the difference of value is less than predetermined torque threshold value, if the step of carrying out revolving speed control according to preset revolving speed-pitch angular dependence includes: When the real-time electromagnetic torque value of wind-driven generator is less than preset threshold with the difference for cutting out electromagnetic torque value, according to preset turn Speed-propeller pitch angle PID relationship carries out revolving speed control.
Second aspect, the embodiment of the invention provides a kind of revolution speed control devices of wind-driven generator, comprising: wind speed acquisition Unit is configured as acquisition wind speed;Wind speed increases processing unit, if being configured as wind speed becomes larger degree greater than the first default wind speed Change threshold then makes the electromagnetic torque of wind-driven generator be kept constant electromagnetic torque value, and increases the mesh of wind-driven generator Pitch angle value is marked, paddle control is carried out out with the target pitch angle value after increasing;Wind speed reduces processing unit, if being configured as detection Become smaller degree greater than the second default wind speed change threshold to wind speed, then reduces the electromagnetic torque and propeller pitch angle of wind-driven generator, and According to the real-time revolving speed of wind-driven generator calculating cut out electromagnetic torque value, if the real-time electromagnetic torque value of wind-driven generator with cut out When the difference of electromagnetic torque value is less than predetermined torque threshold value, according to preset revolving speed-pitch angular dependence and preset revolving speed-electromagnetism Torque relationship carries out revolving speed control.
In conjunction with second aspect, in some embodiments, Motionless electromagnetic torque value is to determine that wind speed becomes larger degree greater than first Real-time electromagnetic torque value at the time of default wind speed change threshold.
In conjunction with second aspect, in some embodiments, wind speed increases processing unit and is also configured to
The real-time tachometer in paddle control process according to wind-driven generator is being carried out out with the target pitch angle value after increasing Calculate corresponding pitch angle value;If corresponding pitch angle value is greater than the target pitch angle value after increasing, continue after increasing Target pitch angle value.
In conjunction with second aspect, in some embodiments, if wind speed reduces processing unit and is specifically configured to detect wind speed The degree that becomes smaller is greater than the second default wind speed change threshold, then the electromagnetic torque and paddle of wind-driven generator are respectively reduced with pre-set velocity Elongation.
In conjunction with second aspect, in some embodiments, if wind speed reduces processing unit and is specifically configured to wind-driven generator Real-time electromagnetic torque value with cut out electromagnetic torque value difference be less than preset threshold when, according to preset revolving speed-propeller pitch angle PID Relationship carries out revolving speed control.
The method for controlling number of revolution and device of wind-driven generator provided in an embodiment of the present invention are become larger degree by judging wind speed With the first default wind speed change threshold, and become smaller degree and the second default wind speed change threshold by wind speed, to judge wind regime Whether mutate.When wind speed becomes larger degree greater than the first default wind speed change threshold, show that wind speed is significantly promoted suddenly, this When to keep the electromagnetic torque of wind-driven generator be Motionless electromagnetic torque value, and increase target pitch angle value, with the target after increasing Pitch angle value carries out out paddle control, and the target pitch angle value after increase is more applicable for the tune paddle process of later moment in time, that is, It says, the target pitch angle value after increase can make up for it the hysteresis quality bring error adjusted during paddle, make turning for wind-driven generator Speed tends towards stability.When wind speed becomes smaller degree greater than the second default wind speed change threshold, reduce the electromagnetic torque of wind-driven generator And propeller pitch angle adjusts the electromagnetic torque and propeller pitch angle of wind-driven generator when wind speed reduces suddenly in time, stablizes wind-driven generator Revolving speed.It, can be with when the real-time electromagnetic torque of wind-driven generator is less than predetermined torque threshold value with the difference for cutting out electromagnetic torque Revolving speed control is carried out using preset revolving speed-pitch angular dependence and preset revolving speed-electromagnetic torque relationship, that is to say, that in wind After condition restores normal, wind-driven generator also restores normal revolving speed control.To can be avoided because wind regime is prominent in wind regime mutation Wind-driven generator caused by becoming is overrun shutdown, to avoid the damage caused by wind-driven generator.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention, In, the same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 is the flow chart of the method for controlling number of revolution of the wind-driven generator of one embodiment of the invention;
Fig. 2 is the wind speed change curve of one embodiment of the invention, propeller pitch angle change curve, electromagnetic torque change curve and turns The schematic diagram of fast change curve;
Fig. 3 is the schematic diagram of wind speed change curve and rotation speed change curve in the prior art;
Fig. 4 is the flow chart of the method for controlling number of revolution of the wind-driven generator of another embodiment of the present invention;
Fig. 5 is the structural schematic diagram of the revolution speed control device of the wind-driven generator of one embodiment of the invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.The present invention never limits In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element, Any modification, replacement and the improvement of component and algorithm.In the the accompanying drawings and the following description, well known structure and skill is not shown Art is unnecessary fuzzy to avoid causing the present invention.
Wind-driven generator is in the case where wind regime changes suddenly, such as wind speed is significantly promoted suddenly, due to wind Speed is promoted, and the revolving speed of wind-driven generator can be made also to be promoted therewith, it is also possible to significantly after wind speed is significantly promoted suddenly Decline, due to wind speed decreased, can make the revolving speed of wind-driven generator also decline therewith.But during wind-power electricity generation, it is desirable that wind The revolving speed of power generator is that variation is gentle, stable, in order to guarantee that the stabilization of speed of wind-driven generator, the embodiment of the present invention propose Following scheme.
Fig. 1 is the flow chart of the method for controlling number of revolution for the wind-driven generator that one embodiment of the invention provides, as shown in Figure 1 The method for controlling number of revolution of wind-driven generator includes step 101- step 104.
In a step 101, wind speed is acquired.
Wherein it is possible to periodically acquire wind speed, the period for acquiring wind speed is shorter, then judges the knot whether wind regime mutates Fruit is more accurate.For example, in one example, the period for acquiring wind speed can be 200 milliseconds.
In a step 102, if wind speed becomes larger, degree is greater than the first default wind speed change threshold, makes the electricity of wind-driven generator Magnetic torque is kept constant electromagnetic torque value, and increases the target pitch angle value of wind-driven generator, with the target paddle after increase Elongation value carries out out paddle control.
Wherein, the wind speed degree that becomes larger can be the difference before becoming larger after wind speed becomes larger with wind speed, is also possible to wind speed and becomes larger Rate.Whether suddenly first default wind speed change threshold judges wind regime significantly raised separation, the first default wind for characterizing Fast change threshold can specifically be set according to factors such as the period of acquisition wind speed and wind regime mutation standards in the industry.When wind speed becomes When big degree is greater than the first default wind speed change threshold, show that wind speed increases substantially suddenly.Suddenly substantially in order to avoid wind speed The problem of revolving speed that degree improves the wind-driven generator caused is promoted suddenly, is kept constant electricity for the electromagnetic torque of wind-driven generator Magnetic torque value, and increase the target pitch angle value of wind-driven generator, paddle control is carried out out with the target pitch angle value after increasing.
Motionless electromagnetic torque value is the revolving speed when determining that wind speed becomes larger degree greater than the first default wind speed change threshold, The preset revolving speed of the wind-driven generator-corresponding electromagnetic torque value of electromagnetic torque relationship, wind-driven generator will whithin a period of time by Electromagnetic torque value is kept constant electromagnetic torque value.The preset revolving speed of wind-driven generator-electromagnetic torque relationship can be wind-force hair One of the characteristic relation of motor itself, specifically, revolving speed-electromagnetic torque that the manufacturer that can be wind-driven generator provides is bent Line.Target pitch angle value is the pitch angle value that the expection wind-driven generator of setting reaches.Target pitch angle value can be than becoming in wind speed The original target pitch angle value of wind-driven generator when big degree is greater than the first default wind speed change threshold is 5 ° big~and 7 °, In, original target pitch angle value is obtained according to the revolving speed and preset revolving speed-pitch angular dependence of current wind-driven generator , preset revolving speed-pitch angular dependence is specifically as follows revolving speed-propeller pitch angle PID arithmetic.For example, being greater than in the wind speed degree that becomes larger When the first default wind speed change threshold, the original target pitch angle value of wind-driven generator is 2 °, then can set the mesh after increasing Marking pitch angle value is 7 °~9 °.Wind speed is significantly promoted suddenly, and the revolving speed of wind-driven generator can be made to increase, increase the paddle of blade Elongation can reduce the revolving speed of wind-driven generator, to guarantee the stabilization of speed of wind-driven generator.Since wind speed is in raised bench Section, in the initial stage that wind speed is in ascent stage, the rotating speed difference at two moment of wind-driven generator is smaller, and utilization is existing The variable pitch speed that preset revolving speed-propeller pitch angle PID arithmetic obtains is also smaller, so that obtained original target pitch angle It is worth also smaller, that is to say, that the pitch angle value obtained in wind regime mutation using preset revolving speed-propeller pitch angle PID arithmetic It is smaller, cause to adjust paddle that there is hysteresis quality.The embodiment of the present invention carries out out paddle control using the target pitch angle value of increase, so that The tune paddle process of wind-driven generator is much sooner.
According to conservation of energy principle, energy that the turning effort that wind energy is equal to wind-driven generator generates and wind-driven generator Therefore the sum of the energy that electromagnetic torque generates makes the electromagnetic torque of wind-driven generator be kept constant electromagnetic torque value, increase wind The target pitch angle value of power generator group, and paddle control is carried out out with the target pitch angle value of increase, it can be unexpected to avoid wind speed The case where wind-driven generator revolving speed caused by increasing substantially rises suddenly.
In step 103, if detecting, wind speed becomes smaller degree greater than the second default wind speed change threshold, reduces wind-force hair The electromagnetic torque and propeller pitch angle of motor, and electromagnetic torque value is cut out according to the calculating of the real-time revolving speed of wind-driven generator, if wind-force is sent out When the real-time electromagnetic torque value of motor is less than predetermined torque threshold value with the difference for cutting out electromagnetic torque value, according to preset revolving speed- Pitch angular dependence and preset revolving speed-electromagnetic torque relationship carry out revolving speed control.
Wherein, the wind speed degree that becomes smaller can be the difference before becoming smaller after wind speed becomes smaller with wind speed, is also possible to wind speed and becomes smaller Rate.Second default wind speed change threshold is for characterizing the separation for judging whether wind regime is greatly lowered suddenly, the second default wind Fast change threshold can specifically be set according to factors such as the period of acquisition wind speed and wind regime mutation standards in the industry.
When wind speed significantly reduces suddenly, reduce the electromagnetic torque and propeller pitch angle of wind-driven generator, it is prominent to avoid wind speed The problem of revolving speed of wind-driven generator caused by so significantly reducing declines suddenly.Cutting out electromagnetic torque value is wind-driven generator Real-time revolving speed corresponding electromagnetic torque value in preset revolving speed-electromagnetic torque relationship, when the real-time electromagnetism of wind-driven generator is turned round When square value is less than predetermined torque threshold value with the difference for cutting out electromagnetic torque value, the revolving speed control flow of this programme, root can be exited Revolving speed control is carried out according to preset revolving speed-pitch angular dependence and preset revolving speed-electromagnetic torque relationship.I.e. using real-time revolving speed and The characteristic relation of wind-driven generator itself gets and cuts out electromagnetic torque value.Wind-driven generator restores to execute wind regime variation gently Revolving speed control when (i.e. common wind regime).It should be noted that preset torque threshold value can be set according to specific works scene, Setting method is not limited herein.For example, preset torque threshold value is 100Nm/40ms, the real-time electromagnetic torque value of wind-driven generator It is less than 100Nm/40ms with the difference for cutting out electromagnetic torque, then can terminates the controlling party of the wind-driven generator in the embodiment of the present invention Method, using the electromagnetic torque and propeller pitch angle of the control method control wind-driven generator of the wind-driven generator under common wind regime, thus Control the wind speed of wind-driven generator.
The method for controlling number of revolution of wind-driven generator provided in an embodiment of the present invention is become larger degree and first by judging wind speed Default wind speed change threshold, and become smaller degree and the second default wind speed change threshold by wind speed, to judge whether wind regime is sent out Raw mutation.When wind speed becomes larger degree greater than the first default wind speed change threshold, shows that wind speed is significantly promoted suddenly, keep at this time The electromagnetic torque of wind-driven generator is Motionless electromagnetic torque value, and increases target pitch angle value, with the target pitch angle after increase Value carries out out paddle control, and the target pitch angle value after increase is more applicable for the tune paddle process of later moment in time, that is to say, that increases Target pitch angle value afterwards can make up for it the hysteresis quality bring error adjusted during paddle, and the revolving speed of wind-driven generator is made to tend to be steady It is fixed.When wind speed becomes smaller degree greater than the second default wind speed change threshold, reduce the electromagnetic torque and propeller pitch angle of wind-driven generator, When wind speed reduces suddenly, the electromagnetic torque and propeller pitch angle of wind-driven generator are adjusted in time, stablize the revolving speed of wind-driven generator.? When the real-time electromagnetic torque of wind-driven generator is less than predetermined torque threshold value with the difference for cutting out electromagnetic torque, it can be used preset Revolving speed-pitch angular dependence and preset revolving speed-electromagnetic torque relationship carry out revolving speed control, that is to say, that restore normal in wind regime Afterwards, wind-driven generator also restores normal revolving speed control.To can be avoided wind caused by being mutated because of wind regime in wind regime mutation Power generator is overrun shutdown, to avoid the damage caused by wind-driven generator.Moreover, the embodiment of the present invention can make wind The variation of the revolving speed of power generator is more gentle, reduces the absolute value of the acceleration of revolving speed, brings to reduce acceleration The impact force for acting on wind-driven generator, reduce the damage to wind-driven generator.
It should be noted that Motionless electromagnetic torque in above-described embodiment is to determine that the wind speed degree that becomes larger is default greater than first Real-time electromagnetic torque value at the time of wind speed change threshold.Detecting that wind speed becomes smaller degree greater than the second default wind speed variation threshold When value, reduce the electromagnetic torque and propeller pitch angle of wind-driven generator, specifically wind-driven generator can be respectively reduced with pre-set velocity Electromagnetic torque and propeller pitch angle, wherein the value for the pre-set velocity that the value and propeller pitch angle for the pre-set velocity that electromagnetic torque reduces reduce can It with identical, can also be different, the value and propeller pitch angle of the pre-set velocity of electromagnetic torque reduction set according to specific operative scenario The value of reduced pre-set velocity.
For example, Fig. 2 is wind speed change curve in one embodiment of the invention, electromagnetic torque change curve, propeller pitch angle variation song The schematic diagram of line and rotation speed change curve.In Fig. 2, abscissa indicates the time, and the ordinate of wind speed change curve indicates wind speed, The ordinate of electromagnetic torque change curve indicates electromagnetic torque value, and the ordinate of propeller pitch angle change curve indicates pitch angle value, turns The ordinate of fast change curve indicates tachometer value.As shown in Fig. 2, the wind speed at t2 moment becomes larger, degree is greater than the first wind speed variation threshold Value, from the t2 moment to the t3 moment, the electromagnetic torque of wind-driven generator keeps the electromagnetic torque value at t2 moment, since the t2 moment into Row opens paddle control, completes to open paddle control process at the t3 moment, the propeller pitch angle of wind-driven generator is adjusted to the target paddle to increase Elongation value.At the t3 moment, wind speed is begun to decline, and the wind speed at t3 moment becomes smaller degree greater than the second default wind speed change threshold, Since the t3 moment, reduce the electromagnetic torque and propeller pitch angle of wind-driven generator, at the t4 moment, the real-time electromagnetism of wind-driven generator is turned round Square value is equal with electromagnetic torque is cut out, and since the t4 moment, obtains wind-driven generator using preset revolving speed-pitch angular dependence Propeller pitch angle obtains the electromagnetic torque of wind-driven generator using preset revolving speed-electromagnetic torque relationship, thus from propeller pitch angle and electromagnetism The common revolving speed control for carrying out wind-driven generator of two aspect of torque.Wherein, specifically, preset revolving speed-pitch angular dependence obtains The propeller pitch angle of wind-driven generator, can according to preset revolving speed-propeller pitch angle PID relationship (i.e. revolving speed-propeller pitch angle PID arithmetic) into The award setting of row wind-driven generator, to carry out revolving speed control.From fig. 2 it can be seen that using in the embodiment of the present invention Wind regime mutation when wind-driven generator the obtained rotation speed change curvilinear motion of wind-driven generator of control method it is gentle, fluctuation Less.Fig. 3 is the schematic diagram of wind speed change curve and rotation speed change curve when wind regime is mutated in the prior art.It can from Fig. 3 To find out, under wind speed scene identical with Fig. 2, the rotation speed change curvilinear motion of wind-driven generator is very big in the prior art, wave It is dynamic violent.From the comparison of Fig. 2 and Fig. 3, it can be seen that the control method of the wind-driven generator of the embodiment of the present invention can be effective Stablize the revolving speed of wind-driven generator, so that wind-driven generator be avoided to overrun shutdown.
Fig. 4 is the flow chart of the method for controlling number of revolution of the wind-driven generator of another embodiment of the present invention, the step in Fig. 4 101, step 103 and step 101, the step 103 in Fig. 1 are essentially identical, the difference is that, step 102 shown in Fig. 1 can To be specifically refined as step 1021- step 1024.
In step 1021, if wind speed becomes larger, degree is greater than the first default wind speed change threshold, makes wind-driven generator Electromagnetic torque is kept constant electromagnetic torque value, and increases the target pitch angle value of wind-driven generator.
In step 1022, carried out out in paddle control process with the target pitch angle value after increasing, according to wind-power electricity generation The real-time revolving speed of machine calculates corresponding pitch angle value.
Wherein, it is carried out out in paddle control process with the target pitch angle value after increasing, according to the real-time of wind-driven generator Revolving speed calculates corresponding pitch angle value using preset revolving speed-pitch angle value relationship.
In step 1023, if corresponding pitch angle value is greater than the target pitch angle value after increasing, continue to increase Target pitch angle value afterwards carries out out paddle control with the target pitch angle value after increasing again.
Wherein, if the corresponding pitch angle value being calculated in step 1022 is greater than the target pitch angle value after increasing, Show that target pitch angle value increases not enough, according to the paddle of the pitch angle value adjustment wind-driven generator after increasing in step 1021 Elongation may make the revolving speed of wind-driven generator slightly higher.Therefore, determining to open the reality in paddle control process according to wind-driven generator When the corresponding pitch angle value that is calculated of revolving speed and preset revolving speed-pitch angular dependence be greater than the target pitch angle value after increasing When, continue the target pitch angle value after increasing, so that making the target pitch angle value of wind-driven generator can finally be adjusted to more Suitable pitch angle value, is further ensured that the revolving speed of stable wind-driven generator.Moreover, adjusting target paddle in opening paddle control process Elongation value, so that in the case where wind speed is significantly promoted suddenly once open paddle and control that wind-driven generator can be stablized Revolving speed, avoid carrying out repeatedly opening paddle control in the case where wind speed is significantly promoted suddenly.
Fig. 5 is a kind of structural schematic diagram of the revolution speed control device 200 for wind-driven generator that one embodiment of the invention provides, The revolution speed control device 200 of wind-driven generator as shown in Figure 5 includes wind speed acquisition unit 201, and wind speed increases processing unit 202 Processing unit 203 is reduced with wind speed.
Wind speed acquisition unit 201 is configured as acquisition wind speed.
Wind speed increases processing unit 202, if being configured as wind speed becomes larger degree greater than the first default wind speed change threshold, So that the electromagnetic torque of the wind-driven generator is kept constant electromagnetic torque value, and increases the target pitch angle of wind-driven generator Value, carries out out paddle control with the target pitch angle value after the increase.
Wind speed reduces processing unit 203, if being configured as detecting that wind speed becomes smaller degree greater than the second default wind speed variation Threshold value then reduces the electromagnetic torque and propeller pitch angle of the wind-driven generator, and according to the real-time tachometer of the wind-driven generator Calculation cuts out electromagnetic torque value, if the real-time electromagnetic torque value and the difference for cutting out electromagnetic torque value of the wind-driven generator are small When predetermined torque threshold value, revolving speed control is carried out according to preset revolving speed-pitch angular dependence and preset revolving speed-electromagnetic torque relationship System.
The revolution speed control device 200 of wind-driven generator provided in an embodiment of the present invention is acquired by wind speed acquisition unit 201 Wind speed, increasing processing unit 202 and wind speed using wind speed reduces processing unit 203 and becomes larger degree in advance greater than first in wind speed respectively If adjusting the pitch of wind-driven generator when wind speed change threshold and when wind speed becomes smaller degree greater than the second default wind speed change threshold Angle and electromagnetic torque.Specifically, becoming larger degree and the first default wind speed change threshold by judging wind speed, and pass through wind speed change Small degree and the second default wind speed change threshold, to judge whether wind regime mutates.When wind speed becomes larger degree in advance greater than first If wind speed change threshold, show that wind speed is significantly promoted suddenly, keeping the electromagnetic torque of wind-driven generator at this time is Motionless electromagnetic Torque value, and increase target pitch angle value, paddle control is carried out out with the target pitch angle value after increasing, the target pitch after increase Angle value is more applicable for the tune paddle process of later moment in time, that is to say, that the target pitch angle value after increase, which can make up for it, adjusts paddle mistake Hysteresis quality bring error in journey, makes the revolving speed of wind-driven generator tend towards stability.When the wind speed degree that becomes smaller is default greater than second When wind speed change threshold, the electromagnetic torque and propeller pitch angle for reducing wind-driven generator adjust wind-force when wind speed reduces suddenly in time The electromagnetic torque and propeller pitch angle of generator stablize the revolving speed of wind-driven generator.The real-time electromagnetic torque of wind-driven generator with cut When the difference of electromagnetic torque is less than predetermined torque threshold value out, preset revolving speed-pitch angular dependence and preset revolving speed-can be used Electromagnetic torque relationship carries out revolving speed control, that is to say, that after wind regime restores normal, wind-driven generator also restores normal revolving speed Control.To which in wind regime mutation, wind-driven generator is overrun shutdown caused by can be avoided because of wind regime mutation, to avoid possibility It is damaged caused by wind-driven generator.Moreover, the embodiment of the present invention can make the variation of the revolving speed of wind-driven generator more gentle, The absolute value of the acceleration of revolving speed is reduced, to reduce the impact force that acceleration bring acts on wind-driven generator, is subtracted The small damage to wind-driven generator.
It should be noted that the Motionless electromagnetic torque value in above-described embodiment is to determine that wind speed becomes larger degree in advance greater than first If real-time electromagnetic torque value at the time of wind speed change threshold.
Wind speed in above-described embodiment increases processing unit 202 and can be additionally configured to the target pitch angle after increase Value carries out out calculating corresponding pitch angle value according to the real-time revolving speed of wind-driven generator in paddle control process;If corresponding propeller pitch angle Value is greater than the target pitch angle value after increasing, then continues the target pitch angle value after increasing.
If wind speed in above-described embodiment, which reduces processing unit 203, can be specifically configured to detect that wind speed becomes smaller degree Greater than the second default wind speed change threshold, then the electromagnetic torque and propeller pitch angle of wind-driven generator are respectively reduced with pre-set velocity.
If the wind speed in above-described embodiment reduces the real-time electricity that processing unit 203 can be specifically configured to wind-driven generator When magnetic torque value is less than preset threshold with the difference for cutting out electromagnetic torque value, carried out according to preset revolving speed-propeller pitch angle PID relationship Revolving speed control.
Functional unit shown in structures described above schematic diagram can be implemented as hardware, software, firmware or they Combination.When realizing in hardware, may, for example, be electronic circuit, specific integrated circuit (ASIC), firmware appropriate, Plug-in unit, function card etc..When being realized with software mode, element of the invention be used to execute the program of required task or Code segment.Perhaps code segment can store in machine readable media program or the data-signal by carrying in carrier wave exists Transmission medium or communication links are sent." machine readable media " may include any Jie for capableing of storage or transmission information Matter.The example of machine readable media include electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), Floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, interior The computer network of networking etc. is downloaded.
The invention is not limited to particular step described above and shown in figure and structures.Also, for simplicity For the sake of, the detailed description to known method technology is omitted here.For example, in the above-described embodiments, several tools have been described and illustrated The step of body, is as example.But method process of the invention is not limited to described and illustrated specific steps, this field Technical staff can make various changes, modification and addition after understanding spirit of the invention, or between changing the step Sequentially.

Claims (10)

1. a kind of method for controlling number of revolution of wind-driven generator characterized by comprising
Acquire wind speed;
If wind speed becomes larger, degree is greater than the first default wind speed change threshold, remains the electromagnetic torque of the wind-driven generator Motionless electromagnetic torque value, and increase the target pitch angle value of wind-driven generator, it is opened with the target pitch angle value after increasing Paddle control;
If detecting, wind speed becomes smaller degree greater than the second default wind speed change threshold, and the electromagnetism for reducing the wind-driven generator is turned round Square and propeller pitch angle, and electromagnetic torque value is cut out according to the calculating of the real-time revolving speed of the wind-driven generator, if the wind-driven generator Real-time electromagnetic torque value and the difference for cutting out electromagnetic torque value be less than predetermined torque threshold value when, according to preset revolving speed- Pitch angular dependence and preset revolving speed-electromagnetic torque relationship carry out revolving speed control,
Wherein, it is described cut out electromagnetic torque value be wind-driven generator real-time revolving speed in preset revolving speed-electromagnetic torque relationship Corresponding electromagnetic torque value.
2. the method for controlling number of revolution of wind-driven generator according to claim 1, which is characterized in that the Motionless electromagnetic torque Value is the real-time electromagnetic torque value determined at the time of the wind speed becomes larger degree greater than the first default wind speed change threshold.
3. the method for controlling number of revolution of wind-driven generator according to claim 2, which is characterized in that after with the increase During target pitch angle value carries out out paddle control further include:
Corresponding pitch angle value is calculated according to the real-time revolving speed of the wind-driven generator;
If the corresponding pitch angle value is greater than the target pitch angle value after the increase, continue to increase the mesh after the increase Mark pitch angle value.
4. the method for controlling number of revolution of wind-driven generator according to any one of claim 1-3, which is characterized in that if described It detects that wind speed becomes smaller degree greater than the second default wind speed change threshold, then reduces the electromagnetic torque and paddle of the wind-driven generator The step of elongation includes:
If detecting, wind speed becomes smaller degree greater than the second default wind speed change threshold, respectively reduces the wind-force with pre-set velocity The electromagnetic torque and propeller pitch angle of generator.
5. the method for controlling number of revolution of wind-driven generator according to claim 1, which is characterized in that wind-driven generator it is real-time When electromagnetic torque value and the difference for cutting out electromagnetic torque value are less than predetermined torque threshold value, according to preset revolving speed-propeller pitch angle Relationship carry out revolving speed control the step of include:
If the real-time electromagnetic torque value of the wind-driven generator and the difference for cutting out electromagnetic torque value are less than preset threshold, Revolving speed control is carried out according to preset revolving speed-propeller pitch angle PID relationship.
6. a kind of revolution speed control device of wind-driven generator when wind regime is mutated characterized by comprising
Wind speed acquisition unit is configured as acquisition wind speed;
Wind speed increases processing unit, if being configured as wind speed becomes larger degree greater than the first default wind speed change threshold, makes described The electromagnetic torque of wind-driven generator is kept constant electromagnetic torque value, and increases the target pitch angle value of wind-driven generator, with Target pitch angle value after increase carries out out paddle control;
Wind speed reduces processing unit, if being configured as detecting, wind speed becomes smaller degree greater than the second default wind speed change threshold, Reduce the electromagnetic torque and propeller pitch angle of the wind-driven generator, and electricity is cut out according to the calculating of the real-time revolving speed of the wind-driven generator Magnetic torque value, if the real-time electromagnetic torque value of the wind-driven generator and the difference for cutting out electromagnetic torque value are less than default turn round When square threshold value, revolving speed control is carried out according to preset revolving speed-pitch angular dependence and preset revolving speed-electromagnetic torque relationship,
Wherein, it is described cut out electromagnetic torque value be wind-driven generator real-time revolving speed in preset revolving speed-electromagnetic torque relationship Corresponding electromagnetic torque value.
7. the revolution speed control device of wind-driven generator according to claim 6, which is characterized in that the Motionless electromagnetic torque Value is the real-time electromagnetic torque value determined at the time of the wind speed becomes larger degree greater than the first default wind speed change threshold.
8. the revolution speed control device of wind-driven generator according to claim 7, which is characterized in that the wind speed raising processing Unit is also configured to
According to the real-time of the wind-driven generator during carrying out out paddle control with the target pitch angle value after the increase Revolving speed calculates corresponding pitch angle value;If the corresponding pitch angle value is greater than the target pitch angle value after the increase, after The continuous target pitch angle value increased after the increase.
9. the revolution speed control device of wind-driven generator a method according to any one of claims 6-8, which is characterized in that the wind If prompt drop reduction process unit is specifically configured to detect that wind speed becomes smaller degree greater than the second default wind speed change threshold, with pre- If speed respectively reduces the electromagnetic torque and propeller pitch angle of the wind-driven generator.
10. the revolution speed control device of wind-driven generator according to claim 6, which is characterized in that at the wind speed reduction If reason unit is specifically configured to the real-time electromagnetic torque value and the difference for cutting out electromagnetic torque value of the wind-driven generator When less than preset threshold, revolving speed control is carried out according to preset revolving speed-propeller pitch angle PID relationship.
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CN101592126A (en) * 2009-05-15 2009-12-02 南京工程学院 The wind energy capture of directly driven permanent magnet synchronous wind generating set tracking and controlling method
CN104832371A (en) * 2015-05-28 2015-08-12 大唐山东烟台电力开发有限公司 Control method and system for wind generating set
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