CN106602606B - Consider the electric network synthetic frequency modulation control method of wind power injection - Google Patents
Consider the electric network synthetic frequency modulation control method of wind power injection Download PDFInfo
- Publication number
- CN106602606B CN106602606B CN201710009132.4A CN201710009132A CN106602606B CN 106602606 B CN106602606 B CN 106602606B CN 201710009132 A CN201710009132 A CN 201710009132A CN 106602606 B CN106602606 B CN 106602606B
- Authority
- CN
- China
- Prior art keywords
- frequency modulation
- blower
- frequency
- wind
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000002347 injection Methods 0.000 title claims abstract description 18
- 239000007924 injection Substances 0.000 title claims abstract description 18
- 238000013178 mathematical model Methods 0.000 claims abstract description 22
- 230000035699 permeability Effects 0.000 claims description 46
- 230000001360 synchronised effect Effects 0.000 claims description 46
- 230000033228 biological regulation Effects 0.000 claims description 34
- 230000005611 electricity Effects 0.000 claims description 25
- 230000008859 change Effects 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 238000003786 synthesis reaction Methods 0.000 claims description 16
- 230000004044 response Effects 0.000 claims description 12
- 241000208340 Araliaceae Species 0.000 claims description 9
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 9
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 9
- 235000008434 ginseng Nutrition 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 9
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims description 6
- 238000007665 sagging Methods 0.000 claims description 6
- 238000011217 control strategy Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000013256 coordination polymer Substances 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 230000002045 lasting effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H02J3/386—
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
- Y02E10/76—Power conversion electric or electronic aspects
Landscapes
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of electric network synthetic frequency modulation control methods of consideration wind power injection, comprising: establishes the comprehensive frequency modulation mathematical model of wind power plant；It determines and participates in minimum scale shared by the Wind turbines of frequency modulation, determine the blower quantity m for participating in frequency modulation；Measure wind speed received by blower；According to comprehensive frequency modulation mathematical model, the best wind speed range of blower is determined；The blower of best wind speed range is selected to participate in frequency modulation；If the quantity that selection participates in frequency modulation blower is less than m, among the blower of the wind speed not higher than best wind speed range, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially reduced；If selection participates in the blower quantity of frequency modulation still less than m, among the blower for the wind speed being higher than in best wind speed range, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially increased.Frequency modulation method of the present invention can realize preferable fm capacity in the case where blower utilization rate is high and abandonment rate is low, guarantee that Frequency Adjustable blower provides lasting frequency modulation and supports, improve frequency modulation effect.
Description
Technical field
The present invention relates to power grid frequency modulation technical field more particularly to a kind of electric network synthetic frequency modulation for considering wind power injection
Control method.
Background technique
With the development of the global economy to the requirement of the rapid growth of electricity needs and sustainable development, wind generating technology is suitable
Gesture and give birth to.Wind energy is conducive to global economy sustainable development using wind power generation as a kind of renewable energy and environmentally protective.
China's national territorial area is vast, and wind energy resources are abundant.In flowing down greatly for global Devoting Major Efforts To Developing wind generating technology, the wind-powered electricity generation hair in China
Electricity also rapidly develops.The wind-powered electricity generation permeability of China some areas power grid has been over 20%.With wind power technology increasingly at
Ripe, wind power cost is lower and lower, and the grid-connected large capacity Wind turbines in China are rapidly developed, can be with traditional synchronous generator
Group grid-connected use together.
However, the characteristics of intrinsic randomness of wind-powered electricity generation, intermittence and fluctuation, moves high-capacity wind power plant to power grid
State stabilization, frequency modulation and voltage modulation etc. all produce significant adverse effect.For example, in DFIG (Double-Fed Induction
Generator, double-fed type influence generator) in, the control system of DFIG decouples its revolving speed and mains frequency, and rotor is caused to revolve
" the implicit inertia " in energy is rotated to the inertia of access power grid almost without contribution, thus influences even to deteriorate to a certain extent
The frequency mediating effect+6 of power grid.When the wind-powered electricity generation permeability in power grid constantly increases, these influences can be also more and more obvious, with
To the safe operation for threatening entire power grid.
In recent years, domestic and foreign scholars have carried out numerous studies to blower participation power grid frequency modulation and have proposed many controls and arranged
It applies.For wind-driven generator frequency response characteristic and conventional synchronization generator different problems, have document it is grid-connected to blower after
The frequency response characteristic of power grid is emulated and has been analyzed, and is started with from rotor flux angle, is proposed through control DFIG rotor magnetic
Chain position controls the variation of rotor speed, to control the power output of Wind turbines.Separately there is document in double-fed induction wind-power electricity generation
Pull-in frequency responds link in machine control system, is contributed by control blower so that blower generation " simulated inertia H ", makes wind power plant
Frequency is participated in a certain extent to adjust.It points out to be controlled with additional simulated inertia and may cause wind-driven generator unstability, propose
The control method for frequency that Frequency Adjustable blower and conventional fan are coordinated.However, that the above research provides is actually " simulated inertia H "
Control to primary frequency modulation, it is above-mentioned there is no the influence of the dynamic factors such as blower utilization rate, abandonment rate, wind speed when consideration frequency modulation
Blower primary frequency modulation in research can only often carry out of short duration frequency modulation and support.
Summary of the invention
To overcome problems of the prior art, the present invention provides a kind of electric network synthetic tune of consideration wind power injection
Frequency control method.The method of the present invention participates in the basic principle of frequency modulation by analysis blower, establishes description wind power plant permeability, participates in
The mathematical model of relationship, utilizes the mathematical modulo between frequency modulation blower proportion and the Frequency regulation factor and utilization rate of blower
Type establishes the comprehensive frequency modulation model of wind power plant.Frequency modulation method of the invention determines that blower is joined on the basis of the synthesis frequency modulation model
With the best wind speed range of frequency modulation, frequency modulation is participated in the blower near best wind speed range in best wind speed range by selecting,
It can guarantee and obtain preferable frequency modulation effect with the quantity of least frequency modulation blower and the smallest abandonment rate, thereby may be ensured that adjustable
Frequency blower provides lasting frequency modulation and supports, and substantially improves the frequency modulation effect of blower.
According to a first aspect of the embodiments of the present invention, a kind of electric network synthetic frequency modulation control of consideration wind power injection is provided
Method, comprising: step 1, pass through the frequency established description wind power plant permeability, participate in the Wind turbines proportion of frequency modulation, blower
The mathematical model of relationship between rate adjustment factor and utilization rate, the comprehensive frequency modulation mathematical model of Lai Jianli wind power plant, wherein wind power plant
Permeability is the ratio of total load power in wind power plant general power and power grid, participates in the Wind turbines proportion of frequency modulation to participate in
The ratio between the Wind turbines power of frequency modulation and wind power plant general power, the Frequency regulation factor of blower are the power output variation of Wind turbines frequency modulation
The ratio between amount and the deviation between mains frequency and power grid rated power, the utilization rate of blower are to participate in the Wind turbines reality of frequency modulation
The ratio between power and its maximum power；Step 2, it determines and participates in minimum shared by the Wind turbines of frequency modulation under different wind power plant permeabilities
Ratio determines that the blower quantity m, m that participate in frequency modulation are greater than 1 using minimum scale shared by the Wind turbines for participating in frequency modulation
Integer；Step 3, wind speed received by each blower in Wind turbines is measured；Step 4, according to the synthesis frequency modulation mathematical modulo
Type determines that blower participates in the best wind speed range of frequency modulation on the basis of guaranteeing blower utilization rate and fm capacity；Step 5, it selects
It selects the blower that wind speed is in best wind speed range and participates in frequency modulation；Step 6, if the quantity that selection participates in the blower of frequency modulation is less than
M, then among the blower from wind speed not higher than the wind speed in best wind speed range, the sequential selection blower that is sequentially reduced according to wind speed
Participate in frequency modulation；Step 7, if selection participates in the blower quantity of frequency modulation still less than m, it is higher than in best wind speed range from wind speed
Among the blower of wind speed, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially increased.
According to one embodiment of present invention, step 1 may include:
Step 101, according to wind power plant participate in primary frequency modulation basic principle, establish wind power plant permeability, mains frequency and
Deviation between power grid rated power, the Wind turbines proportion for participating in frequency modulation, relationship between load power dynamic variable quantity
Mathematical model:
If wind power plant general power PwtAfter access, the power of Synchronous generator is P in power gridG, total load power in power grid
For PL, then
Pwt+PG=Pwt+γPGN=PL (1)
In formula, PGNFor the rated capacity of Synchronous generator, γ=PG/PGNFor the utilization rate of Synchronous generator, according to
The frequency of power grid once adjusts characteristic, if it is Δ P that wind-powered electricity generation, which participates in system loading power dynamics amount when frequency modulation,L, then stable state feelings
Have under condition:
ΔPG+ΔPw-ΔPL=KTΔf (2)
In formula, Δ PGWith Δ PwThe respectively frequency modulation power output of the frequency modulation power output variable quantity of Synchronous generator and Wind turbines
Variable quantity, deviation of the Δ f between the mains frequency and power grid rated frequency, KTFor the sum frequency adjustment factor of power grid, into
One step obtains
KT=KG+KL+Kw (3)
In formula, KG、KwAnd KLRespectively the Frequency regulation factor of synchronous generator, the blower Frequency regulation factor and
The Frequency regulation factor of load, unit are MW/Hz, KGFor the frequency modulation power output variation delta P of Synchronous generatorGWith power grid frequency
The ratio between deviation delta f between rate and power grid rated frequency, KwFor the frequency modulation power output variation delta P of Wind turbineswWith mains frequency and
The ratio between deviation delta f between power grid rated frequency, KLFor load power dynamics amount Δ PLWith mains frequency and the specified frequency of power grid
The ratio between deviation delta f between rate,
Defining the wind power plant permeability ξ is the wind power plant general power PwtWith the total load power PLRatio,
ξ=Pwt/PL (4)
Defining the Wind turbines proportion η for participating in frequency modulation is the Wind turbines power P for participating in frequency modulationwWith the wind
Electric field general power PwtThe ratio between, i.e.,
η=Pw/Pwt (5)
It is found out according to formula (1)-(5)
And KG、KwAnd KLRespectively
In formula, fNFor power grid rated frequency, σGAnd σwFor the difference coefficient of synchronous generator and blower, KLIt * is the frequency of load
The per unit value of rate adjustment factor is 1.5%,
Further, the sum frequency adjustment factor K is found outTPer unit value and using load power as base value total tune difference system
Number σTAre as follows:
Formula (3) and (7) are substituted into formula (8), and arranged:
In formula, the frequency tune difference of the 1st expression synchronous generator of right side of the equal sign is acted on, the 2nd expression wind-electricity integration and ginseng
With the influence after frequency modulation to mains frequency difference coefficient, size does not influence the frequency tune difference effect of synchronous generator in power grid,
The per unit value of the Frequency regulation factor of 3rd expression load,
The frequency modulation power output variation delta P of Wind turbineswFor
When dynamic change Δ P occurs for system loadingLWhen, to ensure the deviation between mains frequency and power grid rated frequency
Absolute value | Δ f |≤0.2Hz, according to formula (2)
ΔPw≥KTΔf-ΔPG+ΔPL=(KT-KG)Δf+ΔPL (11)
As the Frequency regulation factor K of synchronous generatorGWith system sum frequency adjustment factor KTWhen constant, the load power
Dynamic variable quantity Δ PLIt will be by the frequency modulation of Wind turbines power output variation delta PwIt all undertakes, if peak load dynamic change rate ε is
ε=Δ PL/PL (12)
Found out by formula (10)-(11), when mono- timing of wind power plant permeability ξ, according to the load power dynamic change
Measure Δ PLDetermine peak load dynamic change rate ε in the minimum scale η for participating in frequency modulation Wind turbines and corresponding situation；
Step 102, the synthesis fm capacity mathematical model of blower is established,
Participate in the Wind turbines power P of frequency modulationwExpression formula is
In formula, ρ is atmospheric density, and S is that wind wheel skims over area, CPIt is wind energy utilization, v is wind speed,
The utilization rate β for defining blower is the Wind turbines power P for participating in frequency modulationwWith Wind turbines maximum power PwmThe ratio between,
I.e.
β=Pw/Pwm (14)
Define the coefficient of reserve power K of blowerpFor the frequency modulation power output variation delta P of Wind turbineswWith Wind turbines maximum work
Rate PwmThe ratio between, i.e.,
In formula, KpValue range is 10%-20%,
Further, it is released by formula (13)-(15)
Known by formula (10), when the wind power plant permeability ξ is determining and blower all participates in frequency modulation, can be regarded as single
Wind turbines participate in power grid frequency modulation, i.e. ξ is definite value, and formula (10) are then substituted into formula (16), arranged by η=1
Formula (17) shows: under same wind speed, when one timing of deviation between mains frequency and power grid rated power, blower
Difference coefficient σwBigger, the utilization rate β of blower is bigger, i.e., the fm capacity of blower is inversely proportional with blower utilization rate, in order to make
The maximum utilization efficiency that frequency modulation Wind turbines play blower as far as possible on the basis of guaranteeing fm capacity is participated in, under different wind speed
The synthesis coefficient of frequency modulation K for participating in frequency modulation wind-driven generator is defined as follows:
K=α1Kw(η,ξ)+α2β (18)
In formula, KwFor Frequency regulation factor relevant to the permeability ξ of wind power plant frequency modulation ratio η and wind power plant, formula is seen
(7), α1、α2For optimizable real number, α1、α2It is determined according to power grid concrete condition, if necessary to guarantee the tune of blower in power grid
Frequency ability, α1Proportion is larger, guarantees the utilization rate of blower in power grid if necessary, then α2Proportion is larger.
According to one embodiment of present invention, step 2 includes: by the way that wind speed to be constantly increased to the acceptable maximum of blower
Wind speed, adjustment participate in the Wind turbines proportion of frequency modulation, are maintained at mains frequency and limit within range, to determine the ginseng
Minimum scale shared by Wind turbines with frequency modulation.
According to one embodiment of present invention, step 4 includes that step 401, under given wind speed, Wind turbines are accessed
System increases load power, and mains frequency is made to decline 0.2Hz compared to power grid rated frequency, measures blower active power output；
Step 402, in same system, Wind turbines is changed to and participate in frequency modulation Wind turbines, measurement load power changes phase
With the active power output before maximum value and blower the participation frequency modulation of the deviation between mains frequency in situation and power grid rated frequency；
Step 403, in conjunction with the formula and the above measured value in step 101, step 102, the ginseng under given wind speed is obtained
With the Frequency regulation factor K of frequency modulation blowerwAnd the utilization rate β；
Step 404, change wind speed, execute step 401 to step 403, to obtain participating in frequency modulation blower under different wind speed
Frequency regulation factor KwAnd utilization rate β.
According to one embodiment of present invention, step 4 further include: step 405, according to the participation tune under different wind speed
The Frequency regulation factor K of frequency blowerwAnd the utilization rate β, minimum scale shared by the participation frequency modulation Wind turbines are based on formula
(18) the comprehensive coefficient of frequency modulation K of the blower under different wind speed is determined；Step 406, according to the institute of the blower under different wind speed
Comprehensive coefficient of frequency modulation K and the utilization rate β are stated, on the basis of guaranteeing the utilization rate β and comprehensive fm capacity of blower really
Determine the best wind speed range that blower participates in frequency modulation.
According to one embodiment of present invention, consider the electric network synthetic frequency modulation control method that wind power injects, further include
Frequency modulation control is carried out to the Wind turbines for participating in frequency modulation, specifically: rotor speed control passes through turning to the blower for participating in frequency modulation
Rotor speed is adjusted the speed, to adjust the frequency of power grid；Simulated inertia control, by adjusting wind generation set control strategy, makes wind-powered electricity generation
The frequency response characteristic that unit simulates synchronous generator participates in power grid frequency modulation；Sagging control, Wind turbines pass through the synchronous hair of simulation
The operating principle of machine governor, to adjust the frequency of power grid；Revolving speed protection control, when blower causes rotor to turn by excessive frequency modulation
When speed is lower than minimum speed, 0 is set by the additional active power variable quantity of power grid, so that being not involved in by the blower of excessive frequency modulation
Frequency modulation；Power determines control, when participating in the power of blower of frequency modulation more than non-firm power provided by blower, by the volume of power grid
Outer active power variable quantity is set as maximum value, so that the blower more than non-firm power provided by blower is not involved in frequency modulation；Paddle
Elongation control is not involved in frequency modulation when the blower wind speed for participating in frequency modulation is higher than rated value.
In conclusion the embodiment provides a kind of electric network synthetic frequency modulation control sides of consideration wind power injection
Method, comprising: step 1, pass through Wind turbines proportion, the frequency of blower established description wind power plant permeability, participate in frequency modulation
The mathematical model of relationship between adjustment factor and utilization rate, the comprehensive frequency modulation mathematical model of Lai Jianli wind power plant, wherein the wind-powered electricity generation
Field permeability is the ratio of total load power in wind power plant general power and power grid, the Wind turbines proportion for participating in frequency modulation
For the ratio between Wind turbines power and the wind power plant general power for participating in frequency modulation, the Frequency regulation factor of the blower is Wind turbines tune
The ratio between deviation between the power that occurs frequently variable quantity and mains frequency and power grid rated frequency, the utilization rate of blower are to participate in frequency modulation
Wind turbines power and the ratio between Wind turbines maximum power；Step 2, it determines and participates in frequency modulation under different wind power plant permeabilities
Minimum scale shared by Wind turbines determines the wind for participating in frequency modulation using minimum scale shared by the Wind turbines for participating in frequency modulation
Machine quantity m, m are the integer greater than 1；Step 3, wind speed received by each blower in Wind turbines is measured；Step 4, according to
The comprehensive frequency modulation mathematical model determines that blower participates in frequency modulation on the basis of guaranteeing the utilization rate and fm capacity of blower
Best wind speed range；Step 5, selection wind speed is in the blower in the best wind speed range and participates in frequency modulation；Step 6, if
The quantity that selection participates in the blower of frequency modulation is less than m, then from wind speed not higher than the wind speed in the best wind speed range blower it
In, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially reduced；Step 7, if selection participates in the blower quantity of frequency modulation still
Less than m, then among the blower for the wind speed that wind speed is higher than in the best wind speed range, selected according to the sequence that wind speed is sequentially increased
It selects blower and participates in frequency modulation.It can be seen that considering that the electric network synthetic frequency modulation control method of wind power injection passes through analysis blower ginseng
With the basic principle of frequency modulation, establishes description wind power plant permeability, participates in frequency modulation blower proportion and the frequency adjusting of blower
The mathematical model of relationship between coefficient and utilization rate, and propose and corresponding participate in frequency modulation blower model and blower participates in frequency modulation
Control method.The present invention is carried out by establishing fan comprehensive frequency modulation model and participating in frequency modulation to blower based on the synthesis frequency modulation model
Control can guarantee and obtain preferable frequency modulation effect with the quantity of least frequency modulation blower and the smallest abandonment rate, so as to protect
Card Frequency Adjustable blower provides lasting frequency modulation and supports, and substantially improves the frequency modulation effect of blower.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without any creative labor, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the electric network synthetic frequency modulation control method of consideration wind power injection according to an embodiment of the invention
Flow diagram；
Fig. 2 is the flow diagram of the step 1 of Fig. 1 according to an embodiment of the invention；
Fig. 3 is the flow diagram of the step 4 of Fig. 1 according to an embodiment of the invention；
Fig. 4 is hypervelocity method control principle drawing according to an embodiment of the invention；
Fig. 5 is the Controlling model transmission function block diagram that blower according to an embodiment of the invention participates in frequency modulation；
Fig. 6 is award setting model transfer function block diagram according to an embodiment of the invention；
Fig. 7 is Yunnan some areas power grid geographical wiring diagram according to an embodiment of the invention；
Fig. 8 is wind speed waveform diagram according to an embodiment of the invention；
Fig. 9 is mains frequency response curve under different blower permeabilities according to an embodiment of the invention；
Figure 10 is that blower according to an embodiment of the invention participates in the mains frequency response curve after frequency modulation；
Figure 11 is 4 machine, 2 regional power grid model structure according to an embodiment of the invention；
Figure 12 is the equivalent coefficient of frequency modulation K of blower according to an embodiment of the inventionw, comprehensive coefficient of frequency modulation K and wind
The figure of energy usage factor β；
Figure 13 is mains frequency comparison diagram under 10m/s wind speed according to an embodiment of the invention；
Figure 14 is active power comparison diagram under 10m/s wind speed according to an embodiment of the invention.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
Fig. 1 is the electric network synthetic frequency modulation control method of consideration wind power injection according to an embodiment of the invention
Flow diagram.As shown in Figure 1, considering that the electric network synthetic frequency modulation control method of wind power injection may include steps of:
Step 1, Wind turbines proportion, the frequency of blower by establishing description wind power plant permeability, participating in frequency modulation
The mathematical model of relationship between adjustment factor and utilization rate, the comprehensive frequency modulation mathematical model of Lai Jianli wind power plant, wherein the wind-powered electricity generation
Field permeability is the ratio of total load power in wind power plant general power and power grid, the Wind turbines proportion for participating in frequency modulation
For the ratio between Wind turbines power and the wind power plant general power for participating in frequency modulation, the Frequency regulation factor of the blower is Wind turbines tune
The ratio between deviation between the power that occurs frequently variable quantity and mains frequency and power grid rated frequency, the utilization rate of blower are to participate in frequency modulation
Wind turbines power and the ratio between Wind turbines maximum power；
Step 2, it determines and participates in minimum scale shared by the Wind turbines of frequency modulation under different wind power plant permeabilities, using described
Minimum scale shared by the Wind turbines of frequency modulation is participated in determine that the blower quantity m, m that participate in frequency modulation are the integer greater than 1；
Step 3, wind speed received by each blower in Wind turbines is measured；
Step 4, according to the comprehensive frequency modulation mathematical model, on the basis for the utilization rate and fm capacity for guaranteeing blower
Upper determining blower participates in the best wind speed range of frequency modulation；
Step 5, selection wind speed is in the blower in the best wind speed range and participates in frequency modulation；
Step 6, if the quantity that selection participates in the blower of frequency modulation is less than m, the best wind speed model is not higher than from wind speed
Among the blower of wind speed in enclosing, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially reduced；
Step 7, if selection participates in the blower quantity of frequency modulation still less than m, it is higher than the best wind speed range from wind speed
Among the blower of interior wind speed, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially increased.
Fig. 2 is the flow diagram of the step 1 of Fig. 1 according to an embodiment of the invention.As shown in Fig. 2, according to this
One embodiment of invention, step 1 may include steps of:
Step 101, the basic principle that primary frequency modulation is participated according to wind power plant establishes the wind power plant permeability, power grid frequency
Deviation, the Wind turbines proportion for participating in frequency modulation, load power dynamic variable quantity between rate and power grid rated frequency
Between relationship mathematical model:
If wind power plant general power PwtAfter access, the power of Synchronous generator is P in power gridG, total load power in power grid
For PL, then
Pwt+PG=Pwt+γPGN=PL (1)
In formula, PGNFor the rated capacity of Synchronous generator, γ=PG/PGNFor the utilization rate of Synchronous generator, according to
The frequency of power grid once adjusts characteristic, if it is Δ P that wind-powered electricity generation, which participates in system loading power dynamics amount when frequency modulation,L, then stable state feelings
Have under condition:
ΔPG+ΔPw-ΔPL=KTΔf (2)
In formula, Δ PGWith Δ PwThe respectively frequency modulation power output of the frequency modulation power output variable quantity of Synchronous generator and Wind turbines
Variable quantity, deviation of the Δ f between the mains frequency and power grid rated frequency, KTFor the sum frequency adjustment factor of power grid, into
One step obtains
KT=KG+KL+Kw (3)
In formula, KG、KwAnd KLRespectively the Frequency regulation factor of synchronous generator, the blower Frequency regulation factor and
The Frequency regulation factor of load, unit are MW/Hz, KGFor the frequency modulation power output variation delta P of Synchronous generatorGWith power grid frequency
The ratio between deviation delta f between rate and power grid rated frequency, KwFor the frequency modulation power output variation delta P of Wind turbineswWith mains frequency and
The ratio between deviation delta f between power grid rated frequency, KLFor load power dynamics amount Δ PLWith mains frequency and the specified frequency of power grid
The ratio between deviation delta f between rate,
Defining the wind power plant permeability ξ is the wind power plant general power PwtWith the total load power PLRatio,
ξ=Pwt/PL (4)
Defining the Wind turbines proportion η for participating in frequency modulation is the Wind turbines power P for participating in frequency modulationwWith the wind
Electric field general power PwtThe ratio between, i.e.,
η=Pw/Pwt (5)
It is found out according to formula (1)-(5)
And KG、KwAnd KLRespectively
In formula, fNFor power grid rated frequency, σGAnd σwFor the difference coefficient of synchronous generator and blower, KLIt * is the frequency of load
The per unit value of rate adjustment factor is 1.5%,
Further, the sum frequency adjustment factor K is found outTPer unit value and using load power as base value total tune difference system
Number σTAre as follows:
Formula (3) and (7) are substituted into formula (8), and arranged:
In formula, the frequency tune difference of the 1st expression synchronous generator of right side of the equal sign is acted on, the 2nd expression wind-electricity integration and ginseng
With the influence after frequency modulation to mains frequency difference coefficient, size does not influence the frequency tune difference effect of synchronous generator in power grid,
The per unit value of the Frequency regulation factor of 3rd expression load,
The frequency modulation power output variation delta P of Wind turbineswFor
When dynamic change Δ P occurs for system loadingLWhen, to ensure the deviation between mains frequency and power grid rated frequency
Absolute value | Δ f |≤0.2Hz, according to formula (2)
ΔPw≥KTΔf-ΔPG+ΔPL=(KT-KG)Δf+ΔPL (11)
As the Frequency regulation factor K of synchronous generatorGWith system sum frequency adjustment factor KTWhen constant, the load power
Dynamic variable quantity Δ PLIt will be by the frequency modulation of Wind turbines power output variation delta PwIt all undertakes, if peak load dynamic change rate ε is
ε=Δ PL/PL (12)
Found out by formula (10)-(11), when mono- timing of wind power plant permeability ξ, according to the load power dynamic change
Measure Δ PLDetermine peak load dynamic change rate ε in the minimum scale η for participating in frequency modulation Wind turbines and corresponding situation；
Step 102, the synthesis fm capacity mathematical model of blower is established,
Participate in the Wind turbines power P of frequency modulationwExpression formula is
In formula, ρ is atmospheric density, and S is that wind wheel skims over area, CPIt is wind energy utilization, v is wind speed,
The utilization rate β for defining blower is the Wind turbines power P for participating in frequency modulationwWith Wind turbines maximum power PwmThe ratio between,
I.e.
β=Pw/Pwm (14)
Define the coefficient of reserve power K of blowerpFor the frequency modulation power output variation delta P of Wind turbineswWith Wind turbines maximum work
Rate PwmThe ratio between, i.e.,
In formula, KpValue range is 10%-20%,
Further, it is released by formula (13)-(15)
Known by formula (10), when the wind power plant permeability ξ is determining and blower all participates in frequency modulation, can be regarded as single
Wind turbines participate in power grid frequency modulation, i.e. ξ is definite value, and formula (10) are then substituted into formula (16), arranged by η=1
Formula (17) shows: under same wind speed, when one timing of deviation between mains frequency and power grid rated power, blower
Difference coefficient σwBigger, the utilization rate β of blower is bigger, i.e., the fm capacity of blower is inversely proportional with blower utilization rate, in order to make
The maximum utilization efficiency that frequency modulation Wind turbines play blower as far as possible on the basis of guaranteeing fm capacity is participated in, under different wind speed
The synthesis coefficient of frequency modulation K for participating in frequency modulation wind-driven generator is defined as follows:
K=α1Kw(η,ξ)+α2β (18)
In formula, KwFor Frequency regulation factor relevant to the permeability ξ of wind power plant frequency modulation ratio η and wind power plant, formula is seen
(7), α1、α2For optimizable real number, α1、α2It is determined according to power grid concrete condition, if necessary to guarantee the tune of blower in power grid
Frequency ability, α1Proportion is larger, guarantees the utilization rate of blower in power grid if necessary, then α2Proportion is larger.
In addition, according to one embodiment of present invention, step 2 may include: can by the way that wind speed is constantly increased to blower
The maximum wind velocity of receiving, adjustment participate in frequency modulation Wind turbines proportion, are limiting mains frequency within range, to determine ginseng
Minimum scale shared by Wind turbines with frequency modulation.
Fig. 3 is the flow diagram of the step 4 of Fig. 1 according to an embodiment of the invention.As shown in figure 3, according to this
One embodiment of invention, step 4 can include determining that blower is in the Frequency regulation factor K of different wind speedwAnd utilization rate β,
Specifically:
Step 401, under given wind speed, by Wind turbines access system, increase load power, make mains frequency compared to
Power grid rated frequency declines 0.2Hz, measures blower active power output.
Step 402, in same system, Wind turbines is changed to and participate in frequency modulation Wind turbines, measurement load power changes phase
With the active power output before maximum value and blower the participation frequency modulation of the deviation between mains frequency in situation and power grid rated frequency.
Step 403, in conjunction with the formula and the above measured value in step 101, step 102, the ginseng under given wind speed is obtained
With the Frequency regulation factor K of frequency modulation blowerwAnd the utilization rate β.
Step 404, change wind speed, execute step 401 to step 403, to obtain participating in frequency modulation blower under different wind speed
Frequency regulation factor KwAnd utilization rate β.
According to one embodiment of present invention, as shown in figure 3, step 4 can also include:
Step 405, according to the Frequency regulation factor K of the participation frequency modulation blower under different wind speedwAnd the utilization rate
β, minimum scale shared by the participation frequency modulation Wind turbines, the synthesis of the blower under different wind speed is determined based on formula (18)
Coefficient of frequency modulation K.
Step 406, according to the comprehensive coefficient of frequency modulation K of the blower under the different wind speed and utilization rate β, guaranteeing wind
Determine that blower participates in the best wind speed range of frequency modulation on the basis of the utilization rate β of machine and comprehensive fm capacity.
According to one embodiment of present invention, consider the electric network synthetic frequency modulation control method that wind power injects, further include
Frequency modulation control is carried out to the Wind turbines for participating in frequency modulation, as shown in Figure 5 and Figure 6, specifically: rotor speed control, by ginseng
It is adjusted the speed with the rotor speed of the blower of frequency modulation, to adjust the frequency of power grid；Simulated inertia control, by adjusting Wind turbines
Control strategy makes the frequency response characteristic of Wind turbines simulation synchronous generator participate in power grid frequency modulation；Sagging control, Wind turbines
By simulating the operating principle of synchronous generator governor, to adjust the frequency of power grid；Revolving speed protection control, when blower is excessive
When frequency modulation leads to rotor speed lower than minimum speed, 0 is set by the additional active power variable quantity of power grid, so that by excessively adjusting
The blower of frequency is not involved in frequency modulation；Power determines control, when the power for the blower for participating in frequency modulation is more than spare function provided by blower
When rate, maximum value is set by the additional active power variable quantity of power grid, so that being more than the wind of non-firm power provided by blower
Machine is not involved in frequency modulation；Award setting is not involved in frequency modulation when the blower wind speed for participating in frequency modulation is higher than rated value.
Make simple description below with reference to application principle of the fig. 4 to fig. 6 to electric network synthetic frequency modulation control method of the invention.
Fig. 4 is hypervelocity method control principle drawing according to an embodiment of the invention.According to the operation characteristic of blower in figure
It obtains fixed pitch when different wind speed and controls lower output power PTWith the relationship of rotational speed omega, the maximum power point under different wind speed is connected
Best power P can be obtainedoptCurve (MPPT curve).If wind speed is v1When Wind turbines stable operation A point in Fig. 2, work as wind speed
It is reduced to v suddenly2Moment, the active reduction of system, frequency reduce；Since the huge machinery inertial of unit remains at revolving speed
ωw1Place will not be mutated；Blower output power is by the P of A point at this timeASporting wind speed is v2The corresponding P of upper B pointB, and generator
Electromagnetic power remain PA, the release of extra mechanical output forces generating unit speed to decline on axis, blower output mechanical power edge
Curve BC rises.In order to increase system frequency, output power is improved, then needs to adjust slip angular velocity, makes blower with reference to speed
Degree is ωw2.After extra mechanical output releases, blower is rebalanced in point C, and blower output power remains PC, frequency
Rise.Wind speed increase period control method is similar, as shown in point E, D, F in figure.
The principle that frequency modulation is participated according to wind-powered electricity generation, it is as shown in Figure 5 to devise complete frequency control model herein.Model master
It to include 5 parts, it may be assumed that (1) rotor speed control module；(2) simulated inertia control module；(3) sagging control module；(4)
Revolving speed protection and power determination module；(5) award setting module.In Fig. 3, the purpose of revolving speed protection is that blower is avoided excessively to adjust
Cause rotor speed lower than minimum value ω frequentlymin, when revolving speed is down to ωminWhen, power grid need to be by additional active Δ Pf0 is set as,
It is set to be no longer participate in power grid frequency modulation.Power determination module is to avoid the power P f ' for participating in frequency modulation spare more than provided by blower
Power Δ P.Work as Pf ' and reaches maximum value Δ PmaxWhen, power grid is by additional active Δ PfIt is set as Δ Pmax, also it is no longer participate in frequency modulation.
Award setting module is mainly used for the case where wind speed is higher than rated value, and model is as shown in Figure 6.
Specifically, it about rotor speed control, is adjusted the speed by the rotor speed to the blower for participating in frequency modulation, to adjust
The frequency of power grid.It is controlled about simulated inertia, traditional Wind turbines are in the way of tracking maximum power point (MPPT) operation
Power generation, rotor speed and mains frequency are decouplings, and power grid frequency modulation cannot be participated in as synchronous generator.And in order to make wind
Motor group has frequency response ability, participates in power grid frequency modulation, by adjusting wind generation set control strategy, keeps Wind turbines simulation same
The frequency response characteristic for walking generator participates in power grid frequency modulation.The present invention is by passing through simulation synchronous generator rotation for Wind turbines
Inertia Characteristics participate in mains frequency adjustment, the operation of Wind turbines analog conventional synchronous generator Inertia Characteristics.About sagging control
System, electric system active power missing can cause system frequency to decline, Synchronous generator revolving speed promoted to decline, and governor is dynamic
Make, to increase Synchronous generator active power output.This Synchronous generator output power declines with system frequency and is increased
Characteristic be known as the frequency droop characteristic of Synchronous generator.The sagging control of Wind turbines refers to the synchronous hair of Wind turbines simulation
The operating principle of machine governor, Lai Jinhang frequency modulation.It protects and controls about revolving speed, when blower leads to rotor speed by excessive frequency modulation
When lower than minimum speed, 0 is set by the additional active power variable quantity of power grid, so that being not involved in tune by the blower of excessive frequency modulation
Frequently；Determine to control about power, when participating in the power of blower of frequency modulation more than non-firm power provided by blower, by power grid
Additional active power variable quantity is set as maximum value, so that the blower more than non-firm power provided by blower is not involved in frequency modulation；
Frequency modulation is not involved in when the blower wind speed for participating in frequency modulation is higher than rated value about award setting.
Application effect of the invention is described in detail below with reference to the simulation result of Fig. 7 to Figure 14.By emulate come
The correctness of verification method.
For the present invention by taking the part power grid of Yunnan section as an example, Fig. 7 is the main wiring diagram of power grid.Wherein, Luo Pingshan, saddle
It is wind power plant with The Big Dragon Pool, capacity is respectively 48.75 (39 × 1.25) MW, 49.5 (33 × 1.5) MW, 49.5 (33 × 1.5) MW,
Screw gulf, Lan Ping, imperial bottom and Xuebang mountain are power station, and capacity is respectively 200MW, 70MW, 10MW, 15MW.It can be seen that wind-powered electricity generation is installed
Capacity nearly 150MW, accounts for 25% of total capacity or so, relatively large in the section permeability.By all blowers of 3 wind power plants
It respectively is equivalent to a wind-driven generator, 3 equivalent Wind turbines can be obtained, enables the input wind speed of equivalent Wind turbines as schemed
Shown in 8.
1, different permeability wind-powered electricity generations influence mains frequency
Fig. 9 is mains frequency response curve under different blower permeabilities according to an embodiment of the invention.
If when t=70s, the load of node 6 increases suddenly.For shadow of the increase to mains frequency for verifying wind-powered electricity generation permeability
It rings, is respectively to do in the case of 3 kinds of 10%, 20%, 30% to wind-powered electricity generation permeability in the case where total load and constant gross capability
Simulation study, the frequency response curve for obtaining power grid are as shown in Figure 9.As can be seen that the fitful wind under low wind speed is to mains frequency shadow
Sound is bigger, and frequency retrieval must be slower, and mains frequency is also bigger by the fluctuation of random air speed influence.When wind speed is higher, Wind turbines
In 60s-70s, for active power up to maximum value, the gross capability of system is equal.Therefore, because blower is not involved in frequency modulation, wind-powered electricity generation
Permeability is bigger, and power grid inertia is smaller, is unfavorable for the Primary frequency control ability of power grid.
2, the Wind turbines that may participate in frequency modulation replace traditional Wind turbines
By the above-mentioned Wind turbines that may participate in frequency modulation replace traditional Wind turbines, compare blower permeability be 20% when
Mains frequency variation characteristic it is as shown in Figure 10.Figure 10 is that blower according to an embodiment of the invention participates in the electricity after frequency modulation
Net frequency response curve.As can be seen that blower efficiently reduces the change rate and frequency of mains frequency after participating in frequency modulation
Steady-state error, and weaken influence of the random wind speed to frequency, but because blower needs certain margin of power, therefore increase in load
Utilization rate before big is declined slightly.
In addition the present invention establishes 4 machine, 2 regional power grid model in Matlab/Simulink as shown in figure 11.The power grid
It is made of the synchronous generator that 4 rated power are 900MW, it is 300 × 1.5MW that 1 equivalent rated capacity is accessed at bus 5
Wind turbines WF, L1 and L2 be respectively two regions network load, load total capacity be 3000MW.
1, the synthesis fm capacity of blower proportion and blower under different permeabilities is analyzed, is given below hypothesis first
Condition:
1) wind speed is the acceptable minimum windspeed of blower when stable operation；
2) mains frequency is maintained at 50Hz, and frequency departure is no more than ± 0.2Hz；
3) all types blower input wind speed is consistent.
2, blower proportion under different permeabilities
Although wind-powered electricity generation participates in power grid frequency modulation and is concerned with Generation Side frequency stabilization problem, the LOAD FREQUENCY of load side is adjusted
Effect is also by COEFFICIENT KLIt pays attention to, sees formula (7).In order to enable wind-powered electricity generation to participate in power grid frequency modulation and make full use of wind-force as far as possible
Power generation, and minimum scale shared by Frequency Adjustable blower under different wind-powered electricity generation permeabilities is obtained, the specific method is as follows for use:
1) wind speed is constantly increased to the acceptable maximum wind velocity of blower, Frequency Adjustable blower proportion is adjusted, makes power grid
Frequency is limiting within range, so that it is determined that minimum scale η shared by Frequency Adjustable blower；
2) it after operation of power networks is stablized, uprushes 300MW in t=35s season load L1, is limited in range being no more than frequency,
Determine the peak load change rate ε that power grid can bear.
Step-length is set as 5%, increases permeability of the wind-powered electricity generation in power grid constantly, obtains Frequency Adjustable wind under different permeabilities
For example following table one of machine proportion.
Table one:
| Permeability ξ (%) | Blower ratio η (%) | Load changing rate ε (%) |
| 5 | 4.3 | 6.94 |
| 10 | 16.5 | 10.09 |
| 15 | 28.6 | 13.56 |
| 20 | 40.2 | 17.28 |
| 25 | 55.4 | 21.96 |
| 30 | 76.8 | 28.89 |
As it can be seen that needing to increase Frequency Adjustable blower proportion η just can be effectively controlled power grid with the increase of permeability ξ
Frequency fluctuation, and load changing rate ε is increased with it, and is consistent with actual conditions.But, Frequency Adjustable blower ratio η crosses conference and also can
Reduce the utilization rate of wind-powered electricity generation.
3, under different wind speed blower synthesis fm capacity
Using Figure 11 institute representation model, in the identical situation of sudden load change, studied respectively using the method for step 102 adjustable
Equivalent coefficient of frequency modulation Kw and blower usage factor β of the frequency blower from minimum windspeed 6m/s to maximum wind velocity 15m/s, such as Figure 12 institute
Show.For this paper example, to guarantee that the fm capacity of blower gives factor alpha in formula (22) by comprehensively considering1=2 and α2
=1, obtain synthesis coefficient of frequency modulation K such as Figure 12 of Frequency Adjustable wind-driven generator under different wind speed.Blower is conventional fan and adjustable
The frequency and changed power curve such as Figure 13 and 14 obtained in the case of 2 kinds of frequency blower, wherein Δ f1、Δf2Respectively blower participates in
With frequency variation when being not involved in frequency modulation.
The curve explanation of Figure 12, equivalent coefficient of frequency modulation KwIncrease with the increase of wind speed, wind speed is that 12m/s, that is, blower is specified
When wind speed, KwReach maximum value；Blower utilization rate β reduces as wind speed increases, and when wind speed is 13m/s, β reaches minimum value.
When blower is operated above in rated wind speed, wind energy is discharged by award setting, each parameter can be made to be held essentially constant.?
In the range of wind speed is 10-12m/s, the synthesis fm capacity and blower utilization rate of Frequency Adjustable blower are higher, therefore, select 10-
12m/s is best wind speed range.It is obtained by blower utilization rate β, wind speed abandonment rate in the range of 10-12m/s is maintained at 5%-
Within 35%, meet the standard of current abandonment.Therefore, the Wind turbines run at 10-12m/s in wind power plant should be made preferentially to join
With frequency modulation.
In conclusion considering that the electric network synthetic frequency modulation control method of wind power injection participates in frequency modulation by analysis blower
Basic principle, the Frequency regulation factor and benefit established description wind power plant permeability, participate in frequency modulation blower proportion and blower
With the mathematical model of relationship between rate, and propose the corresponding method for participating in frequency modulation blower model and blower and participating in frequency modulation.This
Invention is controlled by establishing fan comprehensive frequency modulation model and participating in frequency modulation to blower based on the synthesis frequency modulation model, the present invention
Frequency modulation method on the basis of the synthesis frequency modulation model, determine blower participate in frequency modulation best wind speed range, by select most
Blower in good wind speed range and near best wind speed range participates in frequency modulation, can guarantee with the quantity of least frequency modulation blower and most
Small abandonment rate obtains preferable frequency modulation effect, thereby may be ensured that Frequency Adjustable blower provides lasting frequency modulation and supports, changes significantly
It has been apt to the frequency modulation effect of blower.
Those skilled in the art will readily occur to of the invention its after considering specification and the disclosure invented here of practice
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
Claims (6)
1. a kind of electric network synthetic frequency modulation control method for considering wind power injection characterized by comprising
Step 1, it is adjusted by establishing description wind power plant permeability, the Wind turbines proportion for participating in frequency modulation, the frequency of blower
The mathematical model of relationship between coefficient and utilization rate, the comprehensive frequency modulation mathematical model of Lai Jianli wind power plant, wherein the wind power plant is seeped
Saturating rate is the ratio of total load power in wind power plant general power and power grid, and the Wind turbines proportion for participating in frequency modulation is ginseng
The ratio between with the Wind turbines power of frequency modulation and wind power plant general power, the Frequency regulation factor of the blower is that Wind turbines frequency modulation goes out
The ratio between deviation between power variable quantity and mains frequency and power grid rated frequency, the utilization rate of blower are the wind for participating in frequency modulation
The ratio between the electric power of the assembling unit and Wind turbines maximum power；
Step 2, it determines and participates in minimum scale shared by the Wind turbines of frequency modulation under different wind power plant permeabilities, utilize the participation
Minimum scale shared by the Wind turbines of frequency modulation is the integer greater than 1 come blower the quantity m, m for determining participation frequency modulation；
Step 3, wind speed received by each blower in Wind turbines is measured；
Step 4, according to the comprehensive frequency modulation mathematical model, on the basis of guaranteeing the utilization rate and fm capacity of blower really
Determine the best wind speed range that blower participates in frequency modulation；
Step 5, selection wind speed is in the blower in the best wind speed range and participates in frequency modulation；
Step 6, if the quantity that selection participates in the blower of frequency modulation is less than m, from wind speed not higher than in the best wind speed range
Among the blower of wind speed, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially reduced；
Step 7, if selection participates in the blower quantity of frequency modulation still less than m, it is higher than wind in the best wind speed range from wind speed
Among the blower of speed, frequency modulation is participated according to the sequential selection blower that wind speed is sequentially increased.
2. the electric network synthetic frequency modulation control method according to claim 1 for considering wind power injection, which is characterized in that step
Rapid 1 includes:
Step 101, according to wind power plant participate in primary frequency modulation basic principle, establish the wind power plant permeability, mains frequency and
Between deviation, the Wind turbines proportion for participating in frequency modulation, load power dynamic variable quantity between power grid rated frequency
The mathematical model of relationship:
If wind power plant general power PwtAfter access, the power of Synchronous generator is P in power gridG, total load power is P in power gridL,
Then
Pwt+PG=Pwt+γPGN=PL (1)
In formula, PGNFor the rated capacity of Synchronous generator, γ=PG/PGNFor the utilization rate of Synchronous generator, according to power grid
Frequency once adjust characteristic, if wind-powered electricity generation participate in frequency modulation when system loading power dynamics amount be Δ PL, then under stable situation
Have:
ΔPG+ΔPw-ΔPL=KTΔf (2)
In formula, Δ PGWith Δ PwThe respectively frequency modulation power output variable quantity of Synchronous generator and the frequency modulation of Wind turbines is contributed and is changed
Amount, deviation of the Δ f between the mains frequency and power grid rated frequency, KTFor the sum frequency adjustment factor of power grid, further
?
KT=KG+KL+Kw (3)
In formula, KG、KwAnd KLThe respectively Frequency regulation factor and load of the Frequency regulation factor of synchronous generator, the blower
Frequency regulation factor, unit is MW/Hz, KGFor the frequency modulation power output variation delta P of Synchronous generatorGWith mains frequency and
The ratio between deviation delta f between power grid rated frequency, KwFor the frequency modulation power output variation delta P of Wind turbineswWith mains frequency and power grid
The ratio between deviation delta f between rated frequency, KLFor load power dynamics amount Δ PLWith mains frequency and power grid rated frequency it
Between the ratio between deviation delta f,
Defining the wind power plant permeability ξ is the wind power plant general power PwtWith the total load power PLRatio,
ξ=Pwt/PL (4)
Defining the Wind turbines proportion η for participating in frequency modulation is the Wind turbines power P for participating in frequency modulationwWith the wind power plant
General power PwtThe ratio between, i.e.,
η=Pw/Pwt (5)
It is found out according to formula (1)-(5)
And KG、KwAnd KLRespectively
In formula, fNFor power grid rated frequency, σGAnd σwFor the difference coefficient of synchronous generator and blower, KLIt * is the frequency tune of load
The per unit value of coefficient is saved, is 1.5%,
Further, the sum frequency adjustment factor K is found outTPer unit value and using load power as total difference coefficient σ of base valueT
Are as follows:
Formula (3) and (7) are substituted into formula (8), and arranged:
In formula, the frequency tune difference of the 1st expression synchronous generator of right side of the equal sign is acted on, the 2nd expression wind-electricity integration and participation tune
To the influence of mains frequency difference coefficient after frequency, the frequency tune difference that size does not influence synchronous generator in power grid is acted on, and the 3rd
Indicate the per unit value of the Frequency regulation factor of load,
The frequency modulation power output variation delta P of Wind turbineswFor
When dynamic change Δ P occurs for system loadingLWhen, to ensure the exhausted of the deviation between mains frequency and power grid rated frequency
To value | Δ f |≤0.2Hz is obtained according to formula (2)
ΔPw≥KTΔf-ΔPG+ΔPL=(KT-KG)Δf+ΔPL (11)
As the Frequency regulation factor K of synchronous generatorGWith system sum frequency adjustment factor KTWhen constant, the load power dynamic
Variation delta PLIt will be by the frequency modulation of Wind turbines power output variation delta PwIt all undertakes, if peak load dynamic change rate ε is
ε=Δ PL/PL (12)
Found out by formula (10)-(11), when mono- timing of wind power plant permeability ξ, according to the load power dynamic variable quantity Δ PL
Determine it is described participate in frequency modulation Wind turbines minimum scale η and corresponding situation under peak load dynamic change rate ε；
Step 102, the synthesis fm capacity mathematical model of blower is established,
Participate in the Wind turbines power P of frequency modulationwExpression formula is
In formula, ρ is atmospheric density, and S is that wind wheel skims over area, CPIt is wind energy utilization, v is wind speed,
The utilization rate β for defining blower is the Wind turbines power P for participating in frequency modulationwWith Wind turbines maximum power PwmThe ratio between, i.e.,
β=Pw/Pwm (14)
Define the coefficient of reserve power K of blowerpFor the frequency modulation power output variation delta P of Wind turbineswWith Wind turbines maximum power Pwm
The ratio between, i.e.,
In formula, KpValue range is 10%-20%,
Further, it is released by formula (13)-(15)
Known by formula (10), when the wind power plant permeability ξ is determining and blower all participates in frequency modulation, ξ is definite value, and η=1 then will
Formula (10) substitutes into formula (16), arranges
Formula (17) shows: under same wind speed, when one timing of deviation between mains frequency and power grid rated power, the tune of blower
Poor factor sigmawBigger, the utilization rate β of blower is bigger, i.e., the fm capacity of blower is inversely proportional with blower utilization rate, in order to make to participate in
Frequency modulation Wind turbines play the maximum utilization efficiency of blower as far as possible on the basis of guaranteeing fm capacity, to participating under different wind speed
The synthesis coefficient of frequency modulation K of frequency modulation wind-driven generator is defined as follows:
K=α1Kw(η,ξ)+α2β (18)
In formula, KwFor Frequency regulation factor relevant to the permeability ξ of wind power plant frequency modulation ratio η and wind power plant, formula (7), α are seen1、
α2For optimizable real number, α1、α2It is determined according to power grid concrete condition, if necessary to guarantee the fm capacity of blower in power grid,
α1Proportion is larger, guarantees the utilization rate of blower in power grid if necessary, then α2Proportion is larger.
3. the electric network synthetic frequency modulation control method according to claim 2 for considering wind power injection, which is characterized in that step
Rapid 2 include:
By the way that wind speed to be constantly increased to the acceptable maximum wind velocity of blower, adjustment participates in the Wind turbines proportion of frequency modulation,
It is maintained at mains frequency to limit within range, to determine minimum scale shared by the Wind turbines for participating in frequency modulation.
4. the electric network synthetic frequency modulation control method according to claim 3 for considering wind power injection, which is characterized in that step
Rapid 4 include determining that blower is in the Frequency regulation factor K of different wind speedwAnd utilization rate β, specifically:
Step 401, under given wind speed, by Wind turbines access system, increase load power, make mains frequency compared to power grid
Rated frequency declines 0.2Hz, measures blower active power output；
Step 402, in same system, Wind turbines is changed to and participate in frequency modulation Wind turbines, measurement load power variation is mutually sympathized with
The maximum value and blower of deviation under condition between mains frequency and power grid rated frequency participate in the active power output before frequency modulation；
Step 403, in conjunction in step 101, step 102 formula and measurement obtain the blower active power output, the blower
Under active power output and load power variation same case before participating in frequency modulation between mains frequency and power grid rated frequency
Deviation maximum value, obtain the Frequency regulation factor K of the blower for participating in frequency modulation under given wind speedwAnd the utilization rate β；
Step 404, change wind speed, execute step 401 to step 403, to obtain the frequency for participating in frequency modulation blower under different wind speed
Rate adjustment factor KwAnd utilization rate β.
5. the electric network synthetic frequency modulation control method according to claim 4 for considering wind power injection, which is characterized in that step
Rapid 4 further include:
Step 405, according to the Frequency regulation factor K of the blower of the participation frequency modulation under different wind speedwAnd the utilization rate β, institute
It states and participates in minimum scale shared by the Wind turbines of frequency modulation, the comprehensive tune of the blower under different wind speed is determined based on formula (18)
Frequency COEFFICIENT K；
Step 406, according to the comprehensive coefficient of frequency modulation K of the blower under the different wind speed and utilization rate β, guaranteeing blower
Determine that blower participates in the best wind speed range of frequency modulation on the basis of the utilization rate β and comprehensive fm capacity.
6. the electric network synthetic frequency modulation control method according to claim 1 for considering wind power injection, which is characterized in that also
Including carrying out frequency modulation control to the Wind turbines for participating in frequency modulation, specifically:
Rotor speed control is adjusted the speed by the rotor speed to the blower for participating in frequency modulation, to adjust the frequency of power grid；
Simulated inertia control makes the frequency response of Wind turbines simulation synchronous generator by adjusting wind generation set control strategy
Characteristic participates in power grid frequency modulation；
Sagging control, Wind turbines pass through the operating principle of simulation synchronous generator governor, to adjust the frequency of power grid；
Revolving speed protection control, when blower leads to rotor speed lower than minimum speed by excessive frequency modulation, by the additional active of power grid
Power variation is set as 0, so that being not involved in frequency modulation by the blower of excessive frequency modulation；
Power determines control, when participating in the power of blower of frequency modulation more than non-firm power provided by blower, by the volume of power grid
Outer active power variable quantity is set as maximum value, so that the blower more than non-firm power provided by blower is not involved in frequency modulation；
Award setting is not involved in frequency modulation when the blower wind speed for participating in frequency modulation is higher than rated value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009132.4A CN106602606B (en) | 2017-01-06 | 2017-01-06 | Consider the electric network synthetic frequency modulation control method of wind power injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009132.4A CN106602606B (en) | 2017-01-06 | 2017-01-06 | Consider the electric network synthetic frequency modulation control method of wind power injection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106602606A CN106602606A (en) | 2017-04-26 |
| CN106602606B true CN106602606B (en) | 2019-07-30 |
Family
ID=58582786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710009132.4A Active CN106602606B (en) | 2017-01-06 | 2017-01-06 | Consider the electric network synthetic frequency modulation control method of wind power injection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106602606B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656436B (en) * | 2017-08-11 | 2021-02-23 | 中国电力科学研究院 | Virtual power plant simulated inertia coordination control method and device |
| CN109861242B (en) * | 2017-11-30 | 2021-04-16 | 中国电力科学研究院有限公司 | Power coordination control method and system for wind power participating in primary frequency modulation of power grid |
| CN108199417B (en) * | 2017-12-27 | 2021-06-18 | 国电南瑞科技股份有限公司 | Wind power plant participation system coordination method with differentiated real-time frequency modulation capability of fans |
| CN109888797B (en) * | 2019-03-09 | 2021-05-04 | 四川大学 | Situation awareness-based frequency control method for system with wind power access transmitting end |
| CN111313464B (en) * | 2020-02-27 | 2023-06-16 | 云南电网有限责任公司电力科学研究院 | Comprehensive frequency modulation control method for wind farm |
| CN111555306B (en) * | 2020-04-29 | 2023-09-01 | 云南电网有限责任公司电力科学研究院 | System and method for participating in regional power grid rapid frequency modulation of wind turbine generator system |
| CN112769164B (en) * | 2021-03-10 | 2022-11-18 | 广东电网有限责任公司电力调度控制中心 | Wind turbine group cooperative control method and device for wind power plant participating in frequency modulation |
| CN113178877A (en) * | 2021-05-17 | 2021-07-27 | 广东电网有限责任公司 | Micro-grid frequency modulation control method and device based on multiple distributed energy sources |
| CN113452041B (en) * | 2021-08-19 | 2023-05-26 | 云南电网有限责任公司电力科学研究院 | Frequency modulation method and system for new energy station |
| CN113944593B (en) * | 2021-09-23 | 2023-03-31 | 浙江运达风电股份有限公司 | High-altitude wind field frequency control system and method |
| CN114256857B (en) * | 2021-12-07 | 2024-03-26 | 国网河南省电力公司电力科学研究院 | Control method and system for improving frequency modulation capability of doubly-fed wind turbine generator |
| CN117458532B (en) * | 2023-11-07 | 2024-04-12 | 华北电力大学 | Wind-solar energy storage station group frequency modulation parameter setting method considering dynamic regulation constraint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441524A (en) * | 2013-08-01 | 2013-12-11 | 国家电网公司 | Variable speed wind turbine generator frequency control method based on dynamic standby power |
| CN105281349A (en) * | 2015-09-19 | 2016-01-27 | 东北电力大学 | Operation control method of double-fed wind generator participating in electric power system frequency modulation |
| CN105743133A (en) * | 2016-05-03 | 2016-07-06 | 电子科技大学 | Active power control method for wind power plant participated power grid frequency modulation |
-
2017
- 2017-01-06 CN CN201710009132.4A patent/CN106602606B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441524A (en) * | 2013-08-01 | 2013-12-11 | 国家电网公司 | Variable speed wind turbine generator frequency control method based on dynamic standby power |
| CN105281349A (en) * | 2015-09-19 | 2016-01-27 | 东北电力大学 | Operation control method of double-fed wind generator participating in electric power system frequency modulation |
| CN105743133A (en) * | 2016-05-03 | 2016-07-06 | 电子科技大学 | Active power control method for wind power plant participated power grid frequency modulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106602606A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106602606B (en) | Consider the electric network synthetic frequency modulation control method of wind power injection | |
| Dong et al. | Optimized power redistribution of offshore wind farms integrated VSC-MTDC transmissions after onshore converter outage | |
| Zeng et al. | Comprehensive coordinated control strategy of PMSG-based wind turbine for providing frequency regulation services | |
| CN108365633A (en) | A kind of doubly-fed wind turbine hypervelocity virtual inertia control method of Control of decreasing load variable element | |
| Liu et al. | A variable droop frequency control strategy for wind farms that considers optimal rotor kinetic energy | |
| Pulgar Painemal | Wind farm model for power system stability analysis | |
| CN108448623A (en) | A kind of doubly-fed wind turbine participates in the complex control system of primary frequency regulation of power network | |
| CN109936152A (en) | Power grid frequency modulation control method after high permeability wind-electricity integration, wind-driven generator | |
| CN106208158B (en) | The Inertia Matching method of mostly micro- source paired running in microgrid | |
| CN106786759B (en) | The Wind turbines primary frequency modulation method mutually coordinated with Synchronous generator | |
| CN109861251A (en) | A kind of double-fed fan comprehensive control method for the temporary steady frequency optimization of microgrid | |
| CN109599865B (en) | Method for determining new energy ratio in power system | |
| CN106286128A (en) | The system frequency control method of a kind of off-load variable-speed wind-power unit and device | |
| Spichartz et al. | New stability concept for primary controlled variable speed wind turbines considering wind fluctuations and power smoothing | |
| Noureldeen et al. | Modeling and investigation of Gulf El-Zayt wind farm for stability studying during extreme gust wind occurrence | |
| CN105610159B (en) | Power system needs wind power plant to provide primary frequency modulation spare capacity analysis method | |
| Zhao et al. | Decentralized grid-forming control strategy and dynamic characteristics analysis of high-penetration wind power microgrids | |
| Zeni et al. | Generic models of wind turbine generators for advanced applications in a VSC-based offshore HVDC network | |
| Wang et al. | A new control strategy of DFIG-based wind farms for power system frequency regulation | |
| CN108493988B (en) | Method and system for calculating inertia time constant of power grid comprising wind turbine generator | |
| CN109980660A (en) | The Robust Interval wind-powered electricity generation dispatching method of frequency response characteristic is improved based on generator | |
| CN109755968A (en) | A kind of neural network guaranteed cost virtual synchronous control method of double-fed fan motor unit | |
| CN109617094A (en) | A kind of double-fed wind power generator group participates in the optimal control method of primary frequency regulation of power network | |
| Xu et al. | Optimal frequency controller parameters of wind turbines participating system frequency control | |
| Krpan et al. | Towards the new low-order system frequency response model of power systems with high penetration of variable-speed wind turbine generators |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |