CN108448622A - A kind of double-fed fan motor unit participates in the award setting method of power grid frequency modulation - Google Patents
A kind of double-fed fan motor unit participates in the award setting method of power grid frequency modulation Download PDFInfo
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- H02J3/386—
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention belongs to double-fed fan motor unit technical fields, disclose a kind of control method and propeller pitch angle of double-fed fan motor unit participation power grid frequency modulation.It is that input signal generates power added control signal by ratio enlargement link by the frequency departure of power grid using ratio controlling unit；Responding power is generated using frequency change rate as input signal using differential controlling unit.The present invention adjusts equivalent model to the frequency of simulated inertia controller parameter and power grid and combines analyzes, it was demonstrated that being connected to the grid for Frequency Adjustable wind turbine can increase the equivalent inertia and equivalent damping of power grid.In improved award setting, frequency response controlling unit is introduced, by adjusting propeller pitch angle, DFIG can also preferably participate in primary frequency modulation under the conditions of high wind speed.Simulation result shows that the double-fed fan motor unit using simulated inertia control and improved award setting can be actively engaged in primary frequency modulation, reduce the steady-state error of power grid.
Description
Technical field
The invention belongs to double-fed fan motor unit technical fields more particularly to a kind of double-fed fan motor unit to participate in power grid frequency modulation
Control method and propeller pitch angle.
Background technology
The method of operation of traditional double-fed fan motor unit tracking maximum power point makes mains frequency and its rotor speed solution
Coupling does not have inertial response and fm capacity, and as the permeability of wind-powered electricity generation in power grid is increasing, study double-fed fan motor unit
Frequency response ability seem particularly urgent.The inertia of power grid reflects the ability that power grid prevents frequency from changing so that generator
There is the time of response to rebuild active balance.The inertia control of double-fed fan motor unit is needed when mains frequency changes, and adjusting it has
Work(is contributed, release or storage rotation function, achievees the purpose that providing inertia to power grid supports.Since double-fed fan motor unit is to active
With idle decoupling control so that it cannot respond to the frequency variation of power grid, therefore, different from synchronous generator, double-fed fan motor
The intrinsic inertia of unit shows as power grid the inertia of one " hiding ".If the total load amount of power grid is certain, when more and more " nothings
When the double-fed fan motor unit of inertia " replaces traditional synchronous generator to be connected to the grid, the equivalent inertia of power grid is caused constantly to reduce,
And inertia is smaller, the frequency stability that will result directly in power grid weakens.For this problem, the existing stage commonly uses following technology
The frequency of power grid is adjusted：1. virtual inertia control methods, have a defect that：Current this control method does not have mostly
Current wind speed is analyzed, and is all made of identical control parameter under all frequency status, influences the control of system frequency
Effect processed；Additionally due to virtual inertia control controls contradiction with maximal power tracing, thus limit the effect of virtual inertia control
Fruit.2. Control of decreasing load method, has a defect that：This method prevents double-fed fan motor unit from working in maximal efficiency
Point；And the off-load method based on award setting is not suitable for needing one secondary frequencies of electric system of quick response to adjust.3.
Decline (proportional controlling means), has a defect that：Current this method is seldom used alone, the control of general and virtual inertia
It is combined with each other, to obtain better control effect.Such as：Pitch regulation technology.The blade pitch device of double-fed fan motor unit is machinery
Component, regulates the speed relatively slow, becomes paddle method frequency modulation effect unobvious using direct；And when stable state, maximum work is also abandoned
Rate tracks, while the frequent movement of unit mechanical part also increases maintenance expense, and is easy to shorten the service life of unit.Separately
Outside, become paddle method and be generally used in high wind speed section, be directed to middle low speed segment, frequency regulating effect is unsatisfactory.
In conclusion problem of the existing technology is：When double-fed fan motor unit is connected to the grid, lead to the equivalent used of power grid
Amount constantly reduces, and inertia is smaller, and the frequency stability for directly resulting in power grid weakens.
Invention content
In view of the problems of the existing technology, the present invention provides the controls that a kind of double-fed fan motor unit participates in power grid frequency modulation
Method and propeller pitch angle.
The invention is realized in this way a kind of double-fed fan motor unit participates in the control method of power grid frequency modulation, the double-fed wind
The control method that motor group participates in power grid frequency modulation uses ratio controlling unit, using the frequency departure of power grid as input signal, warp
Ratio enlargement link is crossed, power added control signal, i.e. Δ P are generated1=-KpfΔf；Using differential controlling unit, frequency is become
Rate generates responding power, i.e., as input signal
Differentiation element is controlled using frequency change rate, is become in the variation that frequency variation initial time is detectable frequency
Gesture can provide larger frequency support, but continuously decreasing with frequency change rate, the power signal of generation taper into；
And proportional component is used as input using frequency departure, although the control speed for changing initial stage in frequency is relatively slow, with frequency
Continue fall, larger power feedback signal can be generated by falling in frequency near minimum point.
Therefore, using the power control signal that the simulated inertia controlling units of two control rings generates is:
When mains frequency declines, blower fan group utilizes this portion of energy, carries out mains frequency adjusting, mains frequency is made to carry
It rises.
Further, the control method of the double-fed fan motor unit participation power grid frequency modulation specifically includes：
First control ring, using ratio controlling unit, the frequency departure of power grid is as input signal, by ratio enlargement
Link generates power added control signal：
ΔP1=-KpfΔf；
Second control ring generates responding power using differential controlling unit using frequency change rate as input signal
For：
fNFor power grid rated frequency 50Hz, fsFor power grid real-time frequency, PdFor generated output after wind turbine off-load, KdfAnd KpfFor
Proportionality coefficient, Δ P1With Δ P2The responding power of respectively two control rings.
Use the power control signal that the simulated inertia controlling unit of two control rings generates for：
Further, the double-fed fan motor unit participates in the controller parameter of the control method of power grid frequency modulation：PGIt is synchronous hair
The output power of motor, PWIt is the output power of Wind turbines, PLIt is load, PAFor general power vacancy；
When stable state, power balance equation：
PG+PW-PL=PA=0；
When mains frequency fluctuation, there is following relationship between general power vacancy and frequency departure：
：
After being connected to the grid, the equivalent inertia of power grid becomes Wind turbinesWherein, wind turbine
Increased inertia values are by K after group is grid-connecteddfIt determines, KdfChange the equivalent inertia of power grid when variation；When Wind turbines are according to tracking
When maximum power point is run, Kdf=0, the inertia of power grid is not contributed, has the double-fed fan motor unit K of simulated inertia controldf
＞ 0 improves power grid inertia；The equivalent damping of power grid becomes D*=Kpf+ D similarly has the double-fed fan motor machine of simulated inertia control
Group KpfThe equivalent damping of ＞ 0, power grid can also increase.
The purpose of the present invention is to provide a kind of control methods participating in power grid frequency modulation using the double-fed fan motor unit
Double-fed fan motor unit.
Another object of the present invention is to provide a kind of propeller pitch angle of the double-fed fan motor unit, the double-fed fan motor units
Power coefficient be tip speed ratio λ and propeller pitch angle β comprehensive function：
In formula：R is wind wheel radius, C1-C6For the power coefficient of specific wind turbine model.
Propeller pitch angle control can only be passed through when Wind turbines rotating speed is close to rated speed by increasing propeller pitch angle frequency response link
The reserved certain propeller pitch angle of system, to retain a part of reserve, and passes through propeller pitch angle executing agency tune when frequency reduces
Propeller pitch angle is saved, the active participation power grid frequency modulation of storage is discharged.
It is illustrated in fig. 5 shown below, if propeller pitch angle is failure to actuate, unit can be such that rotating speed increases by the method that exceeds the speed limit, and be run in point 2,
Active so as to member-retaining portion, propeller pitch angle is minimum value β at this timemin.The propeller pitch angle of wind energy conversion system increases to β1When, it will make it
Power-speed curves move down, and operating point drops to a little 3 from point 1, and the wind energy of capture is reduced, at this time can off-load operation reservation
Part is active；Conversely, if propeller pitch angle reduces at this time, the wind energy of wind energy conversion system capture can correspondingly increase again, can be by off-load before
The active power that operation retains releases, the mechanical output equivalent to increase prime mover so that the electromagnetism that generator is sent out
Power increases, and reaches it and exports active adjustable purpose.
Using the frequency departure of power grid as input, changed come responsive electricity grid frequency by adjusting the size of propeller pitch angle.
The present invention is controlled using hypervelocity method off-load and simulated inertia by double-fed fan motor unit when wind speed is less than rated wind speed
The inertia of " hiding " displays again, and adjusts equivalent model with the frequency of power grid to simulated inertia controller parameter and combine
It is analyzed, it was demonstrated that being connected to the grid of Frequency Adjustable wind turbine can increase the equivalent inertia and equivalent damping of power grid.Double-fed fan motor machine
Two subsidiary control loops of Δ f and df/dt are added in power controller the frequency control link of group.Wherein, first control
Ring has used for reference the control thought of synchronous generator governor, uses ratio controlling unit, using the frequency departure of power grid as defeated
Enter signal, by ratio enlargement link, to generate power added control signal, i.e. Δ P1=-KpfΔf.Second control ring
Differential controlling unit is used, using frequency change rate as input signal, the responding power of generation isKdf
And KpfFor proportionality coefficient, Δ P1With Δ P2The responding power of respectively two control rings.
When stable state, there is following power balance equation：
PG+PW-PL=PA=0
Wherein PGIt is the output power of synchronous generator, PWIt is the output power of Wind turbines, PLIt is load, PAFor
General power vacancy.
Then when mains frequency fluctuation, there is following relationship between general power vacancy and frequency departure：
Then obtained by upper two formula：
Have the Wind turbines of simulated inertia control after being connected to the grid, the equivalent inertia of power grid becomes
Wherein, increased inertia values are by K after Wind turbines are grid-connecteddfIt determines, KdfThe equivalent inertia of power grid can be changed when variation.When
When Wind turbines are according to tracking maximum power point operation, Kdf=0, the inertia of power grid is not contributed at this time, has simulated inertia
The double-fed fan motor unit K of controldf＞ 0 can improve power grid inertia.The equivalent damping of power grid becomes D*=Kpf+ D similarly has
The double-fed fan motor unit K of simulated inertia controlpfThe equivalent damping of ＞ 0, power grid can also increase.
In improved award setting by being improved to traditional propeller pitch angle executing agency, frequency response control is introduced
Link processed, by adjusting propeller pitch angle, DFIG can also preferably participate in primary frequency modulation under the conditions of high wind speed.Simulation result table
It is bright, primary frequency modulation can be actively engaged in using the double-fed fan motor unit of simulated inertia control and improved award setting, reduced
The steady-state error of power grid.
4 machine, the 2 regional power grid model established using MATLAB/SIMULINK simulation softwares, is illustrated in fig. 7 shown below.Power grid mould
Type is made of the synchronous generator that 4 rated power are 700MW, and inertia time constant 6.5s accesses one at busbar 2
Equivalent capacity is the DFIG Wind turbines of 800 × 1.5MW, and the active perunit value output upper limit is 1, load L1And L2Size is distinguished
Variable pitch time constant for 2200MW and 1800MW, double-fed fan motor unit is 3s, and setting wind speed is 14m/s, and Wind turbines are logical
It crosses improved award setting off-load 20% to run, load is uprushed 350MW in 40s.Following Figure 11~Figure 13 the institutes of simulation result
Show.
Figure 11 is that frequency of the Wind turbines when participating in frequency modulation and being not involved in frequency modulation changes comparison diagram, and wind turbine participates in frequency modulation
When, it is 49.85Hz that frequency, which falls minimum point, is 49.75Hz when being not involved in frequency modulation, and steady frequency deviation is 0.1Hz.It at this time can be with
Find out, Wind turbines participate in frequency modulation to improving mains frequency effect highly significant.
Figure 12 is the output variation diagram of double-fed fan motor unit, when 40s, has used the Wind turbines of improved award setting
, by adjusting the size of propeller pitch angle is reduced, the Wind energy extraction of wind energy conversion system can be increased when the frequency of power grid changes, to
The electromagnetic power that generator is sent out can be increased.Change initial stage in mains frequency, the maximum power variation of Wind turbines is close
0.15pu contributes apparent in frequency-modulating process；And when non-added improvement award setting, since blower fan group does not have frequency modulation at this time
Ability, before and after sudden load increase, output maintains essentially near 0.8pu, almost without power grid frequency modulation is participated in.
Figure 13 is the propeller pitch angle variation diagram of double-fed fan motor unit, and when 40s, mains frequency reduces, and active vacancy occurs, uses
The Wind turbines of improved award setting can reduce propeller pitch angle by 17.8 degree, discharge active deposit participation power grid
Frequency adjustment；And the Wind turbines for improving award setting are not used since its original propeller pitch angle actuating mechanism does not have frequency
Responding ability, therefore before and after the variation of the frequency of power grid, propeller pitch angle does not change, and maintains 17.8 degree or so.
Description of the drawings
Fig. 1 is the control method flow chart that double-fed fan motor unit provided in an embodiment of the present invention participates in power grid frequency modulation.
Fig. 2 is DFIG simulated inertias control principle drawing provided in an embodiment of the present invention.
Fig. 3 is the equivalent model schematic diagram that frequency provided in an embodiment of the present invention is adjusted.
Fig. 4 is traditional award setting structure chart provided in an embodiment of the present invention.
Fig. 5 is the award setting characteristic curve schematic diagram of wind energy conversion system provided in an embodiment of the present invention.
Fig. 6 is improved award setting structure chart provided in an embodiment of the present invention.
Fig. 7 is analogue system structural schematic diagram provided in an embodiment of the present invention.
Fig. 8 is frequency variation diagram provided in an embodiment of the present invention.
Fig. 9 is Wind turbines capability diagram provided in an embodiment of the present invention.
Figure 10 is Wind turbines rotation speed change figure provided in an embodiment of the present invention.
Figure 11 is frequency variation diagram provided in an embodiment of the present invention.
Figure 12 is Wind turbines output variation diagram provided in an embodiment of the present invention.
Figure 13 is Wind turbines propeller pitch angle variation diagram provided in an embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
When mains frequency changes, in order to which the inertia for making double-fed induction Wind turbines show similar synchronous generator responds
Characteristic, by increasing frequency control link in Wind turbines controller, the frequency change of power grid being turned to input quantity and introduces frequency
Rate controlling unit, again together by the rotating speed of Wind turbines and mains frequency " coupling ", will before the inertia that " is hidden " it is aobvious
Reveal and, when mains frequency declines, double-fed fan motor unit can reduce the rotor speed of unit by the frequency control link,
Spare active and rotor rotation function is discharged, the primary frequency modulation of power grid is participated in, is the simulated inertia control of double-fed wind power generator group
System.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the control method that double-fed fan motor unit provided in an embodiment of the present invention participates in power grid frequency modulation include with
Lower step：
S101：The control thought for using for reference synchronous generator governor, using ratio controlling unit, by the frequency departure of power grid
As input signal power added control signal is generated by ratio enlargement link；
S102；Using differential controlling unit, using frequency change rate as input signal, the responding power of generation.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
1, in order to obtain frequency response, the frequency control link of double-fed fan motor unit is needed two auxiliary of Δ f and df/dt
Control
Circuit is added in power controller, as shown in Figure 2.In Fig. 2, fNFor power grid rated frequency 50Hz, fsIt is real-time for power grid
Frequency, PdFor generated output after wind turbine off-load, KdfAnd KpfFor proportionality coefficient, Δ P1With Δ P2The response of respectively two control rings
Power.
Wherein, first control ring has used for reference the control thought of synchronous generator governor, uses ratio controlling unit,
Using the frequency departure of power grid as input signal, by ratio enlargement link, to generate power added control signal, i.e.,
ΔP1=-KpfΔf (1)
Second control ring uses differential controlling unit, using frequency change rate as input signal, the response work(of generation
Rate is
Due to input signal difference, ratio controlling unit and differential controlling unit also respectively have quality.Differentiation element is using frequency
Rate change rate controls, and is the variation tendency that can detect frequency in frequency variation initial time, can provide larger frequency branch
Support, but continuously decreasing with frequency change rate, the power signal of generation taper into；And proportional component is made using frequency departure
Continue to fall with frequency, fall in frequency minimum although the control speed for changing initial stage in frequency is relatively slow for input
Point nearby can generate larger power feedback signal.
Therefore, using the power control signal that the simulated inertia controlling units of two control rings generates is：
2, impact analysis of the controller parameter to power grid inertia
Fig. 3 is the equivalent model that mains frequency is adjusted, wherein PGIt is the output power of synchronous generator, PWIt is Wind turbines
Output power, PLIt is load, PAFor general power vacancy.
When stable state, there is following power balance equation：
PG+PW-PL=PA=0 (4)
Then when mains frequency fluctuation, there is following relationship between general power vacancy and frequency departure：
Then obtained by formula (1) and formula (5)：
It can be obtained by formula (6), have the Wind turbines of simulated inertia control after being connected to the grid, the equivalent inertia of power grid becomes
ForWherein, increased inertia values are by K after Wind turbines are grid-connecteddfIt determines, KdfIt can change when variation
The equivalent inertia of power grid.When Wind turbines are according to tracking maximum power point operation, Kdf=0, do not have at this time to the inertia of power grid
Contribution has the double-fed fan motor unit K of simulated inertia controldf＞ 0 can improve power grid inertia.The equivalent damping of power grid becomes
D*=Kpf+ D similarly has the double-fed fan motor unit K of simulated inertia controlpfThe equivalent damping of ＞ 0, power grid can also increase.
3, the award setting of double-fed wind power generator group
3.1 traditional award settings
Award setting mode for traditional variable oar Wind turbines is typically：In rated wind speed hereinafter, keeping paddle
Elongation is near 0 degree, and the rotor speed by changing unit makes wind energy conversion system operate in the state of optimum tip-speed ratio to realize
Maximal wind-energy utilization rate；When more than rated wind speed, to make rotor speed maintain near rated speed, usually increase propeller pitch angle
To reduce the Wind energy extraction of wind energy conversion system, to make the output power of generator be maintained near rated power]；If wind speed decreased,
The wind underpower of wind energy conversion system capture can reduce propeller pitch angle to maintain the rated power of generator, increase Wind energy extraction, increase
Unit output.Its control system is as shown in Figure 4.
In Fig. 4, ωrAnd ωr *The respectively real-time rotating speed and rated speed of Wind turbines, TβFor propeller pitch angle executing agency
Variable pitch constant, β are the propeller pitch angle of output.
3.2 improved award settings
When wind speed is less than rated wind speed, double-fed fan motor unit can store certain spare capacity by hypervelocity method, but
It is when rotating speed is close to rated speed, hypervelocity method is just no longer applicable in.Certain pitch can only be reserved by award setting at this time
Angle to retain a part of reserve, and adjusts propeller pitch angle, release storage when frequency is reduced by propeller pitch angle executing agency
Active participation power grid frequency modulation.It is illustrated in figure 5 the award setting characteristic curve of wind energy conversion system.
In Fig. 5, if propeller pitch angle is failure to actuate, unit can be such that rotating speed increases by the method that exceeds the speed limit, and be run in point 2, so as to
Active with member-retaining portion, propeller pitch angle is minimum value β at this timemin.The propeller pitch angle of wind energy conversion system increases to β1When, its power-will be made to turn
Fast curve moves down, and operating point drops to a little 3 from point 1, and the wind energy of capture is reduced, at this time can off-load run member-retaining portion and have
Work(；Conversely, if propeller pitch angle reduces at this time, the wind energy of wind energy conversion system capture can correspondingly increase again, can protect off-load operation before
The active power stayed releases, the mechanical output equivalent to increase prime mover so that the electromagnetic power that generator is sent out increases
Add, reaches it and export active adjustable purpose.
The mechanical output of the wind energy conversion system capture of variable-speed wind-power unit can be expressed as：
In formula：ρ is atmospheric density, and A is the wind sweeping area of wind energy conversion system, and V is wind speed size, CPFor the usage factor of wind energy.
Wherein, power coefficient is the comprehensive function of tip speed ratio λ and propeller pitch angle β：
In formula：R is wind wheel radius, C1-C6For the power coefficient of specific wind turbine model.
Due to power coefficient CPIt is a more complicated mathematical relationship between propeller pitch angle β and tip speed ratio λ, looks for
It is larger to go out its specific mathematical function relationship difficulty, specific value can be usually determined by look-up table.And the present invention uses
Control program as shown in FIG. 6.
In Fig. 6, β0For the propeller pitch angle that off-load is reserved, KβFor proportionality coefficient.It compares Fig. 4 and increases propeller pitch angle frequency response ring
Section is changed come responsive electricity grid frequency by adjusting the size of propeller pitch angle using the frequency departure of power grid as input, can is power grid
Permanent power is provided to support.
4, double-fed fan motor unit is compared with the frequency characteristic of synchronous generator
When double-fed fan motor unit tracking maximum power point operation, the active power of output generally has reached the maximum wind
Energy utilization rate state, without non-firm power, and its rotor speed and the decoupling control relationship of mains frequency make it not have frequency
Rate responding ability.When mains frequency declines, the output of prime mover cannot be increased.And add frequency in its power controller
After responding link, the inertia of " hiding " is revealed out, has the frequency response ability of similar synchronous generator.
The Synchronous generator typical case inertia constant of big power station is in the range of 2~9s, and the typical case of Wind turbines
For inertia constant in the range of 2~6s, this shows that the inertia constant H of Wind turbines and traditional Synchronous generator are close.Therefore
Has the double-fed fan motor unit inertia constant of fm capacity with synchronous generator in an order of magnitude, it means that equivalent capability
Frequency Adjustable Wind turbines will not reduce the equivalent inertia of power grid after substitution conventional synchronization generator is connected to the grid.
The rotor speed of synchronous generator can be with asynchronous operation ranging from 0.95pu-1pu, and Wind turbines become due to realizing
Speed operation, rotor speed have prodigious change vt space, asynchronous operation ranging from 0.7-1.2pu.Assuming that mains frequency is from f0Variation
To f1, accordingly, rotor speed is in proportion from ω0It is changed to ω1, the rotor kinetic energy of generator releaseThen
It can be obtained according to the rotor speed range of operation of the two, Wind turbines maximum can provide 66% kinetic energy, and synchronous generator is only
Have 9.75%.Therefore, the releasable rotor rotation function of the Wind turbines of equivalent capability is considerably beyond synchronous generator, wind turbine
Group has stronger fm capacity.Therefore when the permeability of wind-powered electricity generation in power grid is continuously improved, the inertia of power grid is contributed will
It can not be ignored.And double-fed fan motor unit can play it and respond rapid advantage, with conventional synchronization when participating in power grid frequency modulation
The frequency modulation of generator combines, and realizes and has complementary advantages, enhances the frequency response ability of power grid.
The application effect of the present invention is explained in detail with reference to emulation.
1, part is emulated
4 machine, the 2 regional power grid model that emulation part is established using MATLAB/SIMULINK simulation softwares, as shown in Figure 7.
The electric network model is made of the synchronous generator that 4 rated power are 700MW, inertia time constant 6.5s, at busbar 2
The DFIG Wind turbines that the equivalent capacity of access one is 800 × 1.5MW, the active perunit value output upper limit is 1, load L1And L2
Size is respectively 2200MW and 1800MW, and the variable pitch time constant of double-fed fan motor unit is 3s, rated wind speed 12m/s, herein
In model, double-fed fan motor unit off-load 20% is run, load L1There is load step when place setting 40s.
The emulation of 1.1 simulated inertias control
Using model shown in Fig. 7, setting wind speed is 9m/s, and Wind turbines are run by the method off-load 20% that exceeds the speed limit, born
Lotus is uprushed 400MW in 40s, and simulation result is as shown in Fig. 8~Figure 10.
Fig. 8 is that frequency of the Wind turbines when participating in frequency modulation and being not involved in frequency modulation changes comparison diagram, when wind turbine participates in frequency modulation,
It is 49.75Hz that frequency, which falls minimum point, is 49.68Hz when being not involved in frequency modulation, and steady frequency deviation is 0.07Hz.The frequency of DFIG
The part that output is indispensable is responded, it is with obvious effects to improve mains frequency.
Fig. 9 is the output variation diagram of double-fed fan motor unit, and when 40s, the Wind turbines that attached simulated inertia control can be with
When the frequency of power grid changes, quick calling it is spare it is active provide active support for power grid, mains frequency variation just
Phase, the maximum power variation of Wind turbines are contributed apparent close to 0.1pu in frequency-modulating process；And not additional simulated inertia control
When, since blower fan group does not have fm capacity at this time, before and after sudden load increase, output maintains essentially near 0.61pu, several
It is not engaged in power grid frequency modulation.
Figure 10 is the rotation speed change figure of double-fed fan motor unit, and when 40s, mains frequency reduces, and active vacancy occurs, attached
The Wind turbines of simulated inertia control can reduce rapidly rotor speed, and the rotation function for discharging active deposit and rotor participates in electricity
The frequency of net adjusts；And the Wind turbines of not additional simulated inertia control due to being still between mains frequency and its rotor speed
Decoupling relationship, therefore before and after the variation of the frequency of power grid, rotor speed maintains 1.115pu or so almost without changing.
1.2 improved award setting emulation
Using model shown in Fig. 7, setting wind speed is 14m/s, and Wind turbines pass through improved award setting off-load
20% operation, load are uprushed 350MW in 40s, and simulation result is as shown in Figure 11~Figure 13.When wind speed reaches 14m/s, by
Value is had reached the maximum in the rotor speed of Wind turbines, hypervelocity method can not be used to carry out off-load, simulated inertia control at this time
Also be not applicable in, so when off-load and frequency modulation carried out using improved award setting.
Figure 11 is that frequency of the Wind turbines when participating in frequency modulation and being not involved in frequency modulation changes comparison diagram, and wind turbine participates in frequency modulation
When, it is 49.85Hz that frequency, which falls minimum point, is 49.75Hz when being not involved in frequency modulation, and steady frequency deviation is 0.1Hz.It at this time can be with
Find out, Wind turbines participate in frequency modulation to improving mains frequency effect highly significant.
Figure 12 is the output variation diagram of double-fed fan motor unit, when 40s, has used the Wind turbines of improved award setting
, by adjusting the size of propeller pitch angle is reduced, the Wind energy extraction of wind energy conversion system can be increased when the frequency of power grid changes, to
The electromagnetic power that generator is sent out can be increased.Change initial stage in mains frequency, the maximum power variation of Wind turbines is close
0.15pu contributes apparent in frequency-modulating process；And when non-added improvement award setting, since blower fan group does not have frequency modulation at this time
Ability, before and after sudden load increase, output maintains essentially near 0.8pu, almost without power grid frequency modulation is participated in.
Figure 13 is the propeller pitch angle variation diagram of double-fed fan motor unit, and when 40s, mains frequency reduces, and active vacancy occurs, uses
The Wind turbines of improved award setting can reduce propeller pitch angle by 17.8 degree, discharge active deposit participation power grid
Frequency adjustment；And the Wind turbines for improving award setting are not used since its original propeller pitch angle actuating mechanism does not have frequency
Responding ability, therefore before and after the variation of the frequency of power grid, propeller pitch angle does not change, and maintains 17.8 degree or so.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (5)
1. a kind of double-fed fan motor unit participates in the control method of power grid frequency modulation, which is characterized in that the double-fed fan motor unit participates in
The control method of power grid frequency modulation uses ratio controlling unit, using the frequency departure of power grid as input signal, by ratio enlargement
Link generates power added control signal；Response is generated using frequency change rate as input signal using differential controlling unit
Power；
Use the power control signal that the simulated inertia controlling unit of two control rings generates for：
When mains frequency declines, blower fan group utilizes this portion of energy, carries out mains frequency adjusting.
2. double-fed fan motor unit as described in claim 1 participates in the control method of power grid frequency modulation, which is characterized in that the double-fed
The control method that Wind turbines participate in power grid frequency modulation specifically includes：
First control ring, using ratio controlling unit, the frequency departure of power grid is as input signal, by ratio enlargement ring
Section, generates power added control signal：
ΔP1=-KpfΔf；
Second control ring, using differential controlling unit, using frequency change rate as input signal, generating responding power is：
fNFor power grid rated frequency 50Hz, fsFor power grid real-time frequency, PdFor generated output after wind turbine off-load, KdfAnd KpfFor ratio
Coefficient, Δ P1With Δ P2The responding power of respectively two control rings；
Use the power control signal that the simulated inertia controlling unit of two control rings generates for：
3. double-fed fan motor unit as described in claim 1 participates in the control method of power grid frequency modulation, which is characterized in that the double-fed
Wind turbines participate in the controller parameter of the control method of power grid frequency modulation：PGIt is the output power of synchronous generator, PWIt is wind turbine
The output power of group, PLIt is load, PAFor general power vacancy；
When stable state, power balance equation：
PG+PW-PL=PA=0；
When mains frequency fluctuation, there is following relationship between general power vacancy and frequency departure：
：
After being connected to the grid, the equivalent inertia of power grid becomes Wind turbinesWherein, Wind turbines are simultaneously
Increased inertia values are by K after netdfIt determines, KdfChange the equivalent inertia of power grid when variation；When Wind turbines are maximum according to tracking
When power points is run, Kdf=0, the inertia of power grid is not contributed, has the double-fed fan motor unit K of simulated inertia controldf＞ 0,
Improve power grid inertia；The equivalent damping of power grid becomes D*=Kpf+ D similarly has the double-fed fan motor unit K of simulated inertia controlpf
The equivalent damping of ＞ 0, power grid can also increase.
4. a kind of control method participating in power grid frequency modulation using double-fed fan motor unit described in claims 1 to 3 any one is double
Present Wind turbines.
5. a kind of propeller pitch angle of double-fed fan motor unit as claimed in claim 4, which is characterized in that the wind of the double-fed fan motor unit
Energy usage factor is the comprehensive function of tip speed ratio λ and propeller pitch angle β：
In formula：R is wind wheel radius, C1-C6For the power coefficient of specific wind turbine model；
Increase propeller pitch angle frequency response link, using the frequency departure of power grid as input, is rung by adjusting the size of propeller pitch angle
Mains frequency is answered to change.
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| CN109936152A (en) * | 2018-11-09 | 2019-06-25 | 西南交通大学 | Power grid frequency modulation control method after high permeability wind-electricity integration, wind-driven generator |
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| CN111431192A (en) * | 2020-03-24 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Method, device and system for restraining low-frequency oscillation of power grid by using additional damping |
| CN111525599A (en) * | 2020-05-12 | 2020-08-11 | 国网四川省电力公司经济技术研究院 | Frequency modulation control method for speed-increasing type wind turbine generator |
| CN111786404A (en) * | 2020-06-10 | 2020-10-16 | 东南大学 | Wind power plant active power optimal distribution method considering optimal rotor kinetic energy |
| CN111812983A (en) * | 2020-07-19 | 2020-10-23 | 国网山西省电力公司电力科学研究院 | Wind turbine generator primary frequency modulation load shedding control method based on differential flat active disturbance rejection control |
| CN112332452A (en) * | 2020-10-28 | 2021-02-05 | 国网四川省电力公司经济技术研究院 | Frequency control method and system for double-fed induction wind driven generator |
| CN113054672A (en) * | 2021-03-03 | 2021-06-29 | 山东大学 | Wind power frequency modulation method and system considering multi-link cooperative control |
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| CN109936152A (en) * | 2018-11-09 | 2019-06-25 | 西南交通大学 | Power grid frequency modulation control method after high permeability wind-electricity integration, wind-driven generator |
| CN109936152B (en) * | 2018-11-09 | 2023-12-22 | 国网甘肃省电力公司张掖供电公司 | Grid frequency modulation control method after high-permeability wind power grid connection and wind driven generator |
| CN111371104B (en) * | 2020-03-20 | 2023-03-24 | 国网内蒙古东部电力有限公司 | Power grid frequency stability control method based on wind-storage combined power generation system |
| CN111371104A (en) * | 2020-03-20 | 2020-07-03 | 国网内蒙古东部电力有限公司 | Power grid frequency stability control method based on wind-storage combined power generation system |
| CN111431192A (en) * | 2020-03-24 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Method, device and system for restraining low-frequency oscillation of power grid by using additional damping |
| CN111525599A (en) * | 2020-05-12 | 2020-08-11 | 国网四川省电力公司经济技术研究院 | Frequency modulation control method for speed-increasing type wind turbine generator |
| CN111525599B (en) * | 2020-05-12 | 2023-04-11 | 国网四川省电力公司经济技术研究院 | Frequency modulation control method for speed-increasing type wind turbine generator |
| CN111786404A (en) * | 2020-06-10 | 2020-10-16 | 东南大学 | Wind power plant active power optimal distribution method considering optimal rotor kinetic energy |
| CN111786404B (en) * | 2020-06-10 | 2022-09-27 | 东南大学 | Wind power plant active power optimal distribution method considering optimal rotor kinetic energy |
| CN111812983A (en) * | 2020-07-19 | 2020-10-23 | 国网山西省电力公司电力科学研究院 | Wind turbine generator primary frequency modulation load shedding control method based on differential flat active disturbance rejection control |
| CN112332452A (en) * | 2020-10-28 | 2021-02-05 | 国网四川省电力公司经济技术研究院 | Frequency control method and system for double-fed induction wind driven generator |
| CN113054672A (en) * | 2021-03-03 | 2021-06-29 | 山东大学 | Wind power frequency modulation method and system considering multi-link cooperative control |
| CN113217281A (en) * | 2021-05-11 | 2021-08-06 | 上海电气风电集团股份有限公司 | Wind power generation system, control method and device thereof, electronic device, and storage medium |
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| CN113991701A (en) * | 2021-10-28 | 2022-01-28 | 国网山东省电力公司电力科学研究院 | Frequency control method and system for double-fed fan |
| CN113991701B (en) * | 2021-10-28 | 2023-10-10 | 国网山东省电力公司电力科学研究院 | Frequency control method and system for doubly-fed fan |
| CN118008695A (en) * | 2024-04-08 | 2024-05-10 | 昆明理工大学 | Advanced fuzzy pitch control method for participating in power grid frequency modulation of mountain wind turbine generator system in plateau |
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