CN109713722A - A kind of intelligent frequency modulation control method of Wind turbines full blast speed and its system and wind power plant - Google Patents
A kind of intelligent frequency modulation control method of Wind turbines full blast speed and its system and wind power plant Download PDFInfo
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- CN109713722A CN109713722A CN201910081991.3A CN201910081991A CN109713722A CN 109713722 A CN109713722 A CN 109713722A CN 201910081991 A CN201910081991 A CN 201910081991A CN 109713722 A CN109713722 A CN 109713722A
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Abstract
The invention discloses a kind of intelligent frequency modulation control method of Wind turbines full blast speed and its systems and wind power plant, belong to Wind turbines field, Wind turbines under maximum power tracing state are run by load shedding, power backup is provided, it is made to have the long-term ability for participating in system primary frequency modulation；And precise controlling of the Wind turbines in full blast speed section is realized by the wind speed zone control tactics based on hypervelocity limit value, by preferentially using speed change frequency modulation, start variable pitch frequency modulation when speed change frequency modulation is unable to satisfy load shedding or increases function demand.The method of the invention realizes precise controlling of the Wind turbines in full blast speed section by the wind speed zone control tactics based on hypervelocity limit value, reliable and stable power backup is provided when system frequency is normal, the power support of Fast Persistence is provided in system frequency abnormality, facilitates the power grid friendly for promoting Wind turbines.
Description
Technical field
The present invention relates to Wind turbines field, more particularly to a kind of intelligent frequency modulation control method of Wind turbines full blast speed and
Its system and wind power plant.
Background technique
With the large-scale development application with wind-power electricity generation, permeability in the power system is constantly increased, but due to
The decoupling control mode of the unique texture and the method for operation of Wind turbines, especially rotation speed of fan and system frequency is answered extensively
With so that Wind turbines can not active response system frequency variation；Meanwhile in order to pursue maximally utilizing for wind energy, wind-powered electricity generation
Unit generallys use maximum power tracing control mode, does not provide additional reserve, so as to cause can not be in system frequency
The auxiliary frequency modulation service of similar conventional synchronization unit is provided when decline.Therefore, large-scale wind power integration necessarily leads to electric system
Inertia enabling capabilities and Primary frequency control ability constantly decline, to system high-power vacancy impact under frequency stability with it is extensive
Reactivation power brings risk.
In order to successfully manage above-mentioned risk, existing research is mainly simulated by introducing in the net-connected controller of Wind turbines
The links such as synchronous machine equation of rotor motion and primary frequency modulation make it have inertia, damping, frequency modulation and the pressure regulation of Synchronous generator
Etc. the external characteristics that is incorporated into the power networks, to improve the power grid friendly of Wind turbines.Specifically, research focuses primarily upon wind-powered electricity generation at present
The inertia control of unit, exceed the speed limit control, pitch control and combinations thereof control.Wherein, inertia control is running of wind generating set process
In, by changing the given value of current of unit rotor side current transformer, control spinner velocity occurs to release in short-term under provisional situation of change
The part kinetic energy that Wind turbines rotation plastid is stored is put/absorbs to provide similar with the temporal variations of quick response system frequency
In the rotary inertia of conventional rack, but the duration is very of short duration, can not provide lasting frequency modulation and support.Hypervelocity control is control
Rotor overspeed operation makes fan operation in the secondary advantage of non-maximum wind power extract state, and the active power for retaining a part is spare,
It is adjusted for a secondary frequencies, but is only applicable to rated wind speed operating condition below.Variable pitch control is by controlling blower
Propeller pitch angle changes the Windward angle of blade and the mechanical energy of input, a certain operating point being under maximum power point,
To reserving certain spare capacity, in the case that wind regime is certain, propeller pitch angle is bigger, unit there are reserve also get over
Greatly, but by mechanical property it is limited, response speed is slower, and frequent movement will affect unit durability.
It is existing to study the group for having begun to focus on different control methods in order to overcome the respective applied defect of above-mentioned control method
It closes and uses, have complementary advantages to be formed, but focus primarily upon theoretic coordinated control, not to the wind turbine in full blast speed section
Group frequency modulation provides the explanation of specific, concrete.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of intelligent frequency modulation control method of Wind turbines full blast speed and its it is
System and wind power plant, the control method have fully considered speed change frequency modulation and variable pitch tune in the standby appearance operation of load shedding and increasing function frequency modulation operation
The mutual supplement with each other's advantages of frequency realizes speed change prior to the active frequency modulation control of variable pitch by effective wind speed subregion, helps to promote wind
The power grid enabling capabilities of motor group, to overcome the shortcomings of the prior art.
In order to solve the above technical problems, technical solution provided by the invention is as follows:
On the one hand, the present invention provides a kind of intelligent frequency modulation control method of Wind turbines full blast speed, chases after in maximum power
Wind turbines under track state are run by load shedding provides power backup, it is made to have the long-term energy for participating in system primary frequency modulation
Power；And precise controlling of the Wind turbines in full blast speed section is realized by the wind speed zone control tactics based on hypervelocity limit value, lead to
It crosses preferentially using speed change frequency modulation, starts variable pitch frequency modulation when speed change frequency modulation is unable to satisfy load shedding or increases function demand.
Further, the wind speed subregion is that the full blast speed section of Wind turbines is divided into speed change frequency modulation wind area [vin,vwd],
Cooperate with frequency modulation wind area [vwd,vwm] and variable pitch frequency modulation wind area [vwm,vout], wherein vinAnd voutRespectively the incision of Wind turbines and
Cut-out wind speed；vwdAnd vwmOn the wind speed that d% load shedding only respectively can be realized with speed change frequency modulation when Wind turbines operate normally
Limit and the wind speed lower limit for entering Heng Zhuansuqu；
Control strategy are as follows: in speed change frequency modulation wind area [vin,vwd] load shedding is carried out by primary variable or increases function, it is adjusted in collaboration
The area Pin Feng [vwd,vwm] cooperate with speed change to carry out orderly load shedding by variable pitch or increase function, in variable pitch frequency modulation wind area [vwm,vout] pass through master
Dynamic variable pitch carries out load shedding or increases function.
Further, vwdAnd vwmMaximum power curve and load shedding power curve are drawn by spline method and maximum is super
Speed limit value is determined.
Further, when normal operation, the maximum machine power of Wind turbines are as follows:
Pm=0.5 ρ * π * R2*v3*Cp(λopt,βopt) (1)
In formula (1), ρ is atmospheric density；R is impeller radius；V is wind speed；Cp(λopt,βopt) it is optimal wind energy utilization system
Number；λoptFor optimal tip speed ratio；βoptFor optimal propeller pitch angle；
The power coefficient are as follows:
In formula (2), c1-c6 is usage factor, depends on specific blower model；β is blade pitch angle；τ is conversion system
Number；λ is tip speed ratio；ω is wheel speed；
P- ω is drawn according to formula (1), (2)rCurve；
When the Wind turbines that Wind turbines are under maximum power tracing operating status can not be held when system frequency declines
It is continuous to promote its active output, in order to make it have the long-term ability for participating in system primary frequency modulation, it is necessary to it is standby to reserve certain power
With, make its load shedding run.
By above-mentioned formula (1) and (2) it is found that Wind turbines load shedding operation can only by reduce power coefficient come
It realizes.Under a certain fixed wind speed, since tip speed ratio is proportional to wheel speed, for determining the Wind turbines of model, wind
Energy usage factor shows as the function of wheel speed and propeller pitch angle.
The load shedding of Wind turbines is realized by reducing power coefficient, in the case where Wind turbines load shedding d%, drop
Power coefficient is carried to be denoted as:
Cpd(ωref,βref)=(1-d%) Cp(ωopt,βopt) (3)
In the situation known to formula (3) right side, it need to only pass through and determine ωrefAnd βrefOne of both solves another parameter, obtains
Obtain load shedding revolving speed finally and variable pitch instruction.
Further, when monitoring that wind speed is located at speed change frequency modulation wind area, the β under the different wind speed within the scope of the wind areaopt
=0 and ωoptIt is known that then:
When Wind turbines are in, load shedding is standby to hold the execution stage, and pitch-controlled system is failure to actuate, the wind energy benefit in load shedding d% operation
It is (1-d%) C with coefficientpm(ωopt,βopt)；Wind turbines only pass through speed change frequency modulation control from the optimized operation point of normal operation
Along P- ωrCurve increases wheel speed and makes its stable operation in load shedding operating point, to reserve the power backup of d%；It is steady at this time
Determine β when load shedding operationref=βopt=0, then pass through ω under the different wind speed within the scope of formula (2) area inverse Chu Gaifengref；
Increase the function execution stage when Wind turbines are in frequency modulation, pitch-controlled system is failure to actuate, drop of the Wind turbines from power backup
It carries operating point and only passes through speed change frequency modulation control along P- ωrCurve reduces wheel speed and runs it quickly to optimized operation point,
Realize the collaboration frequency modulation of Wind turbines.
Further, when monitoring that wind speed is located at collaboration frequency modulation wind area, β under the different wind speed within the scope of the wind areaopt=
0 and ωoptIt is known that then:
When Wind turbines are in, load shedding is standby to hold the execution stage, and the power coefficient in load shedding d% operation is (1-d%)
Cpm(ωopt,βopt)；Wind turbines preferentially pass through speed change frequency modulation control along P- ω from the optimized operation point of normal operationrCurve increases
Then large impeller revolving speed is increased propeller pitch angle in the case where keeping maximum (top) speed constant by variable pitch frequency modulation control and makes its stabilization
Load shedding operating point is operated in, to reserve the power backup of d%；ω when stable load shedding is run at this timeref=ωmax, then can pass through
β under different wind speed within the scope of formula (2) area inverse Chu Gaifengref；
Increase the function execution stage when Wind turbines are in frequency modulation, Wind turbines preferentially pass through from the load shedding operating point of power backup
Speed change frequency modulation control is along P- ωrCurve increases wheel speed to optimized rotating speed ωopt, then keeping optimal by pitch control
Reduce propeller pitch angle in the case that revolving speed is constant and make its stable operation to optimized operation point, realizes the collaboration frequency modulation of Wind turbines.
Further, when monitoring that wind speed is located at variable pitch frequency modulation wind area, β under the different wind speed within the scope of the wind areaopt=
β0(vw) and ωopt=ωmaxIt is known that then:
When Wind turbines are in, load shedding is standby to hold the execution stage, and the power coefficient in load shedding d% operation is (1-d%)
Cpm(ωopt,βopt)；Wind turbines are keeping maximum (top) speed constant from the optimized operation point of normal operation by variable pitch frequency modulation control
In the case where increase propeller pitch angle and make its stable operation in load shedding operating point, to reserve the power backup of d%；Stable load shedding at this time
ω when operationref=ωmax, then can pass through β under the different wind speed within the scope of formula (2) area inverse Chu Gaifengref；
If Wind turbines, which are in frequency modulation according to Wind turbines, increases the function execution stage, Wind turbines are transported from the load shedding of power backup
Row point is reduced propeller pitch angle in the case where keeping optimized rotating speed constant by pitch control and makes its stable operation to optimized operation
Point realizes effective frequency modulation of Wind turbines.
The drop that load shedding is run from operating normally to stablizing can be realized in full blast speed section by above-mentioned wind speed partition method
Carry it is standby hold control, and increase power control system from the frequency modulation for stablizing load shedding and running to normal operation.
On the other hand, a kind of intelligent frequency-modulation control system of Wind turbines full blast speed is provided, comprising:
One or more processors；
Storage device, for storing one or more programs,
When one or more of programs are executed by one or more of processors, so that one or more of processing
Device realizes the described in any item intelligent frequency modulation control methods of Wind turbines full blast speed of claim 1 to 8.
In another aspect, a kind of wind power plant is provided, including the intelligent frequency-modulation control system of Wind turbines full blast speed.
By adopting such a design, the present invention has at least the following advantages:
(1) the method for the invention realizes Wind turbines in full blast by the wind speed zone control tactics based on hypervelocity limit value
Precise controlling in fast section carries out load shedding by primary variable in speed change frequency modulation wind area or increases function, passes through in collaboration frequency modulation wind area
Variable pitch cooperates with speed change to carry out orderly load shedding or increases function, carries out load shedding by active variable pitch in variable pitch frequency modulation wind area or increases function, thus
Reliable and stable power backup is provided when system frequency is normal, the power branch of Fast Persistence is provided in system frequency abnormality
Support facilitates the power grid friendly for promoting Wind turbines.
(2) the method for the invention makes full use of the response quickly of system of speed change frequency modulation while evading its blind area of control, sufficiently
Its mechanical wear is reduced simultaneously using the continued reliability of variable pitch frequency modulation, speed change and variable pitch frequency modulation are realized in full blast speed segment limit
Uniformly coordinated control, facilitate promoted Wind turbines synthesis frequency modulation efficiency.
Detailed description of the invention
The above is merely an overview of the technical solutions of the present invention, in order to better understand the technical means of the present invention, below
In conjunction with attached drawing, the present invention is described in further detail with specific embodiment.
Fig. 1 is full blast speed section subregion P- ω of the inventionrCurve and frequency modulation control schematic diagram.
Specific embodiment
The exemplary embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here
It is limited.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be by the scope of the present invention
Communicate completely to those skilled in the art.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless otherwise will not be explained in an idealized or overly formal meaning by specific definitions.
The present invention provides a kind of embodiment of intelligent frequency modulation control method of Wind turbines full blast speed, as shown in Figure 1, to being in
Wind turbines under maximum power tracing state are run by load shedding provides power backup, so that it is had long-term participation system primary
The ability of frequency modulation；And realize that Wind turbines are fine in full blast speed section by the wind speed zone control tactics based on hypervelocity limit value
Control starts variable pitch frequency modulation when speed change frequency modulation is unable to satisfy load shedding or increases function demand by preferentially using speed change frequency modulation.
In order to obtain faster frequency modulation response speed, while reducing the operating frequency of pitch-controlled system to the greatest extent, the present invention is preferential
Using speed change frequency modulation, start variable pitch frequency modulation when speed change frequency modulation is unable to satisfy load shedding or increases function demand.For this purpose, being different from traditional base
Wind speed partitioned mode in maximal power tracing area, Heng Zhuansuqu and invariable power area, the method are fast by the full blast of Wind turbines
Section is divided into speed change frequency modulation wind area [vin,vwd], cooperate with frequency modulation wind area [vwd,vwm] and variable pitch frequency modulation wind area [vwm,vout], wherein vin
And voutRespectively Wind turbines switch in and out wind speed, are generally provided by Wind turbines supplier；vwdAnd vwmRespectively exist
The upper wind velocity limit of d% load shedding only can be realized with speed change frequency modulation when Wind turbines operate normally and enter under the wind speed of Heng Zhuansuqu
Limit generally draws maximum power curve and load shedding power curve and maximum hypervelocity limit value by spline method to be determined.
It is illustrated in conjunction with Fig. 1 with the embodiment of the intelligent frequency modulation control method of certain Wind turbines:
When normal operation, the maximum machine power of Wind turbines is
Pm=0.5 ρ * π * R2*v3*Cp(λopt,βopt) (1)
Wherein, ρ is atmospheric density；R is impeller radius；V is wind speed；Cp(λopt,βopt) it is optimal power coefficient；
λoptFor optimal tip speed ratio；βoptFor optimal propeller pitch angle.
Further, power coefficient is
Wherein, c1-c6 is usage factor, depends on specific blower model；β is blade pitch angle；τ is conversion coefficient；λ is
Tip speed ratio；ω is wheel speed.
Further, in the case where Wind turbines load shedding d%, note load shedding power coefficient is
Cpd(ωref,βref)=(1-d%) Cp(ωopt,βopt) (3)
The known situation on the right side of above formula, only need to be by determining ωrefAnd βrefOne of both solves another parameter
Obtain final load shedding revolving speed and variable pitch instruction.
Further, in order to realize that effective load shedding under full blast condition is run, the method proposes the wind speed based on hypervelocity limit value
Partition method, as shown in Figure 1:
In order to obtain faster frequency modulation response speed, while reducing the operating frequency of pitch-controlled system to the greatest extent, the method is excellent
Speed change frequency modulation is first used, starts variable pitch frequency modulation when speed change frequency modulation is unable to satisfy load shedding or increases function demand.For this purpose, being different from tradition
Wind speed partitioned mode based on maximal power tracing area, Heng Zhuansuqu and invariable power area, the method is by the full blast of Wind turbines
Fast section is divided into speed change frequency modulation wind area [vin,vwd], cooperate with frequency modulation wind area [vwd,vwm] and variable pitch frequency modulation wind area [vwm,vout], wherein
vinAnd voutRespectively Wind turbines switch in and out wind speed, are generally provided by Wind turbines supplier；vwdAnd vwmRespectively
The upper wind velocity limit of d% load shedding only can be realized with speed change frequency modulation when Wind turbines operate normally and enter the wind speed of Heng Zhuansuqu
Lower limit generally draws maximum power curve and load shedding power curve and maximum hypervelocity limit value by spline method to be subject to really
It is fixed, respectively optimized operation point B and the affiliated P- ω of optimized operation point DrThe correspondence wind speed of curve.
Further, ABCDE is normal operation curve, and A ' B ' C ' D ' E ' is the standby load shedding operation curve held of corresponding d%, then
The region ABB ' A ' belongs to speed change frequency modulation wind area, and the region BDB ' belongs to collaboration frequency modulation wind area and the region DE belongs to variable pitch frequency modulation wind area.
1) speed change frequency modulation wind area [vin,vwd]
It is operated normally within the scope of the wind area and keeps β=0 constant with the propeller pitch angle under wind speed each when load shedding operation, by drawing
Make [vin,vwd] the normal operation curve AB in range obtains the optimized rotating speed ω under each wind speedoptWith optimal power Popt, then may be used
In the P- ω of each wind speedrThe standby load shedding operating point held of d% is found on curve respectively, then draws out the speed change load shedding fortune in the wind area
Row curve A ' B ', to pass through the load shedding running speed ω under each wind speed within the scope of formula (2) area inverse Chu Gaifengref, it is load shedding
It is standby that operation offer revolving speed and variable pitch instruction are provided.
Hold the execution stage load shedding is standby, pitch-controlled system is failure to actuate, and holdings propeller pitch angle is β=0, and Wind turbines are from normal operation
Optimized operation point B only pass through speed change frequency modulation control along BB ' curve increase wheel speed and make its stable operation load shedding run
Point B ', i.e., the load shedding operation of realization Wind turbines is with the power backup of reserved d%；
Increase function in frequency modulation and execute the stage, pitch-controlled system is failure to actuate, and holding propeller pitch angle is β=0, and Wind turbines are run from load shedding
Point B ' only reduces wheel speed along B ' B curve by speed change frequency modulation control and runs it quickly to optimized operation point B, that is, realizes
The fast frequency hopping of Wind turbines.
2) frequency modulation wind area [v is cooperateed withwd,vwm]
Propeller pitch angle when operating normally within the scope of the wind area under each wind speed is that β=0 is constant, passes through drafting [vwd,vwm] range
Interior normal operation curve BD obtains the optimized rotating speed ω under each wind speedoptWith optimal power Popt, then can be in the P- ω of each wind speedr
The standby load shedding operating point held of d% is found on curve respectively, then draws out the speed change load shedding operation curve B ' D " in the wind area, but by
To ωr≤ωmaxThe limitation of Wind turbines maximum (top) speed, the then rotational speed omega of load shedding operating pointref=ωmax, anti-by formula (2)
Calculate the load shedding operation propeller pitch angle β within the scope of the wind area under each wind speedref, revolving speed and variable pitch instruction are provided for the standby appearance operation of load shedding.
In the load shedding standby appearance execution stage, Wind turbines preferentially pass through speed change frequency modulation control from the optimized operation point C of normal operation
System increases wheel speed along CO ' curve, then makes pitch in the case where keeping maximum (top) speed constant by variable pitch frequency modulation control
Angle is from β=β0Increase to β=βd, then Wind turbines P- ωrCurve is from v (β0) curve becomes v (βd) curve, and stable operation is in this
The load shedding operating point C ' of curve, i.e., the load shedding operation of realization Wind turbines is with the power backup of reserved d%；
Increase function in frequency modulation and execute the stage, Wind turbines are preferentially bent along C ' O by speed change frequency modulation control from load shedding operating point C '
Line reduces wheel speed to optimized rotating speed ωopt, pitch is then made in the case where keeping optimized rotating speed constant by pitch control
Angle is from β=βdIt is decreased to β=β0, then Wind turbines P- ωrCurve is from v (βd) curve becomes v (β0) curve, and stable operation is in this
The optimized operation point C of curve realizes the collaboration frequency modulation of Wind turbines.
3) variable pitch frequency modulation wind area [vwm,vout]
Being operated normally within the scope of the wind area with the wheel speed under wind speed each when load shedding operation is ω=ωmax, by drawing
Make [vwm,vout] normal operation in range when each wind speed under propeller pitch angle βopt=β0(v) and operation power Popt, thus can draw
Operation power of the d% load shedding processed when running under each wind speed, in combination with each wind within the scope of formula (1) and the area (2) inverse Chu Gaifeng
Load shedding under speed runs propeller pitch angle βref, revolving speed and variable pitch instruction are provided for the standby appearance operation of load shedding.
In the load shedding standby appearance execution stage, Wind turbines are existed from the optimized operation point D of normal operation by variable pitch frequency modulation control
Increase blade angle along the direction DD ' in the case where keeping maximum (top) speed constant and makes Wind turbines stable operation in load shedding operating point
D ', i.e., the load shedding operation of realization Wind turbines is with the power backup of reserved d%；
Increase function in frequency modulation and execute the stage, Wind turbines are keeping optimized rotating speed not by pitch control from load shedding operating point D '
Reduce propeller pitch angle along the direction D ' D in the case where change and make its stable operation to optimized operation point D, i.e., realization Wind turbines is effective
Frequency modulation.
The drop that load shedding is run from operating normally to stablizing can be realized in full blast speed section by above-mentioned wind speed partition method
Carry it is standby hold control, and increase power control system from the frequency modulation for stablizing load shedding and running to normal operation.
The present invention provides a kind of Wind turbines full blast speed section frequency modulation control methods, propose the full blast speed section of Wind turbines
It is divided into speed change frequency modulation wind area [vin,vwd], cooperate with frequency modulation wind area [vwd,vwm] and variable pitch frequency modulation wind area [vwm,vout], wherein vinWith
voutRespectively Wind turbines switch in and out wind speed；vwdAnd vwmRespectively when Wind turbines operate normally only with speed change tune
Frequency can be realized the upper wind velocity limit of d% load shedding and enter the wind speed lower limit of Heng Zhuansuqu.In the speed change frequency modulation wind area of Wind turbines
Using only speed change frequency modulation control, speed change frequency modulation control is used and with variable pitch frequency modulation control preferentially in collaboration frequency modulation wind area for supplement,
Variable pitch frequency modulation control is used only in variable pitch frequency modulation wind area, to realize the drop run from normal operation to load shedding in full blast speed section
Standby appearance control is carried, and increases power control system from the frequency modulation that load shedding runs to normal operation.The present invention is provided when system frequency is normal
Reliable and stable power backup provides the power support of Fast Persistence in system frequency abnormality, helps to promote Wind turbines
Power grid friendly；It makes full use of the response quickly of system of speed change frequency modulation while evading its blind area of control, make full use of variable pitch frequency modulation
Continued reliability simultaneously reduce its mechanical wear, in full blast speed segment limit realize speed change and variable pitch frequency modulation uniformly coordinated control
System facilitates the synthesis frequency modulation efficiency for promoting Wind turbines.
Wind turbines full blast speed section frequency modulation control method disclosed by the invention, using the control method of wind speed subregion frequency modulation,
It makes full use of the response quickly of system of speed change frequency modulation while evading its blind area of control, make full use of the continued reliability of variable pitch frequency modulation same
When reduce its mechanical wear, in full blast speed segment limit realize speed change and variable pitch frequency modulation uniformly coordinated control, effectively combine become
The rapidity of velocity modulation frequency and the stability of variable pitch frequency modulation, can effectively realize the full blast speed section active frequency modulation of Wind turbines, be promoted
The power grid friendly of Wind turbines.Facilitate the synthesis frequency modulation efficiency of promotion Wind turbines.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, this
Field technical staff makes a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all falls within this hair
In bright protection scope.
Claims (10)
1. a kind of intelligent frequency modulation control method of Wind turbines full blast speed, which is characterized in that under maximum power tracing state
Wind turbines run by load shedding power backup be provided, so that it is had the long-term ability for participating in system primary frequency modulation；And pass through
Wind speed zone control tactics based on hypervelocity limit value realize precise controlling of the Wind turbines in full blast speed section, by preferentially using
Speed change frequency modulation starts variable pitch frequency modulation when speed change frequency modulation is unable to satisfy load shedding or increases function demand.
2. the intelligent frequency modulation control method of Wind turbines full blast speed according to claim 1, which is characterized in that the wind speed point
Area is that the full blast speed section of Wind turbines is divided into speed change frequency modulation wind area [vin,vwd], cooperate with frequency modulation wind area [vwd,vwm] and variable pitch tune
The area Pin Feng [vwm,vout], wherein vinAnd voutRespectively Wind turbines switch in and out wind speed；vwdAnd vwmRespectively in wind-powered electricity generation
The upper wind velocity limit of d% load shedding only can be realized with speed change frequency modulation when unit operates normally and enter the wind speed lower limit of Heng Zhuansuqu；
Control strategy are as follows: in speed change frequency modulation wind area [vin,vwd] load shedding is carried out by primary variable or increases function, in collaboration frequency modulation wind area
[vwd,vwm] cooperate with speed change to carry out orderly load shedding by variable pitch or increase function, in variable pitch frequency modulation wind area [vwm,vout] pass through active variable pitch
It carries out load shedding or increases function.
3. the intelligent frequency modulation control method of Wind turbines full blast speed according to claim 2, which is characterized in that vwdAnd vwmPass through
Spline method draws maximum power curve and load shedding power curve and maximum hypervelocity limit value to be determined.
4. the intelligent frequency modulation control method of Wind turbines full blast speed according to claim 2 or 3, which is characterized in that normal fortune
When row, the maximum machine power of Wind turbines are as follows:
Pm=0.5 ρ * π * R2*v3*Cp(λopt,βopt) (1)
In formula (1), ρ is atmospheric density；R is impeller radius；V is wind speed；Cp(λopt,βopt) it is optimal power coefficient；
λoptFor optimal tip speed ratio；βoptFor optimal propeller pitch angle；
The power coefficient are as follows:
In formula (2), c1-c6 is usage factor, depends on specific blower model；β is blade pitch angle；τ is conversion coefficient；λ
For tip speed ratio；ω is wheel speed；
P- ω is drawn according to formula (1), (2)rCurve；
The load shedding of Wind turbines is realized by reducing power coefficient, in the case where Wind turbines load shedding d%, load shedding wind
Energy usage factor is denoted as:
Cpd(ωref,βref)=(1-d%) Cp(ωopt,βopt) (3)
In the situation known to formula (3) right side, it need to only pass through and determine ωrefAnd βrefOne of both solves another parameter, obtains most
Whole load shedding revolving speed and variable pitch instruction.
5. the intelligent frequency modulation control method of Wind turbines full blast according to claim 4 speed, which is characterized in that when monitoring wind
When speed is located at speed change frequency modulation wind area, the β under the different wind speed within the scope of the wind areaopt=0 and ωoptIt is known that then:
When Wind turbines are in, load shedding is standby to hold the execution stage, and pitch-controlled system is failure to actuate, the wind energy utilization system in load shedding d% operation
Number is (1-d%) Cpm(ωopt,βopt)；Wind turbines only pass through speed change frequency modulation control along P- from the optimized operation point of normal operation
ωrCurve increases wheel speed and makes its stable operation in load shedding operating point, to reserve the power backup of d%；Stable drop at this time
β when carrying rowref=βopt=0, then pass through ω under the different wind speed within the scope of formula (2) area inverse Chu Gaifengref；
Increase the function execution stage when Wind turbines are in frequency modulation, pitch-controlled system is failure to actuate, and Wind turbines are transported from the load shedding of power backup
Row point is only by speed change frequency modulation control along P- ωrCurve reduces wheel speed and runs it quickly to optimized operation point, realizes
The collaboration frequency modulation of Wind turbines.
6. the intelligent frequency modulation control method of Wind turbines full blast speed according to claim 4 or 5, which is characterized in that work as monitoring
When being located at collaboration frequency modulation wind area to wind speed, β under the different wind speed within the scope of the wind areaopt=0 and ωoptIt is known that then:
When Wind turbines are in, load shedding is standby to hold the execution stage, and the power coefficient in load shedding d% operation is (1-d%) Cpm
(ωopt,βopt)；Wind turbines preferentially pass through speed change frequency modulation control along P- ω from the optimized operation point of normal operationrCurve increases
Then wheel speed is increased propeller pitch angle in the case where keeping maximum (top) speed constant by variable pitch frequency modulation control and it is made to stablize fortune
Row is in load shedding operating point, to reserve the power backup of d%；ω when stable load shedding is run at this timeref=ωmax, then can pass through public affairs
β under different wind speed within the scope of formula (2) area inverse Chu Gaifengref；
Increase the function execution stage when Wind turbines are in frequency modulation, Wind turbines preferentially pass through speed change from the load shedding operating point of power backup
Frequency modulation control is along P- ωrCurve increases wheel speed to optimized rotating speed ωopt, optimized rotating speed is then being kept by pitch control
Reduce propeller pitch angle in the case where constant and make its stable operation to optimized operation point, realizes the collaboration frequency modulation of Wind turbines.
7. according to any intelligent frequency modulation control method of Wind turbines full blast speed of claim 4 to 6, which is characterized in that when
When monitoring that wind speed is located at variable pitch frequency modulation wind area, β under the different wind speed within the scope of the wind areaopt=β0(vw) and ωopt=ωmax?
Know, then:
When Wind turbines are in, load shedding is standby to hold the execution stage, and the power coefficient in load shedding d% operation is (1-d%) Cpm
(ωopt,βopt)；Wind turbines are keeping maximum (top) speed constant from the optimized operation point of normal operation by variable pitch frequency modulation control
In the case of increase propeller pitch angle and make its stable operation in load shedding operating point, to reserve the power backup of d%；Stable load shedding fortune at this time
ω when rowref=ωmax, then can pass through β under the different wind speed within the scope of formula (2) area inverse Chu Gaifengref；
If Wind turbines, which are in frequency modulation according to Wind turbines, increases function execution stage, load shedding operating point of the Wind turbines from power backup
Reduce propeller pitch angle in the case where keeping optimized rotating speed constant by pitch control and makes its stable operation to optimized operation point, it is real
Effective frequency modulation of existing Wind turbines.
8. the intelligent frequency modulation control method of Wind turbines full blast speed according to any one of claims 1 to 7, which is characterized in that institute
State frequency modulation control method foundation: in Wind turbines in the case where determining model, under a certain fixed wind speed, tip speed ratio direct ratio
In wheel speed, power coefficient shows as the function of wheel speed and propeller pitch angle.
9. a kind of intelligent frequency-modulation control system of Wind turbines full blast speed characterized by comprising
One or more processors；
Storage device, for storing one or more programs,
When one or more of programs are executed by one or more of processors, so that one or more of processors are real
The existing described in any item intelligent frequency modulation control methods of Wind turbines full blast speed of claim 1 to 8.
10. a kind of wind power plant, including the intelligent frequency-modulation control system of Wind turbines full blast as claimed in claim 9 speed.
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