CN108448653A - The control method of primary frequency regulation of power network is participated in based on variable sagging coefficient Wind turbines - Google Patents
The control method of primary frequency regulation of power network is participated in based on variable sagging coefficient Wind turbines Download PDFInfo
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- CN108448653A CN108448653A CN201810307500.8A CN201810307500A CN108448653A CN 108448653 A CN108448653 A CN 108448653A CN 201810307500 A CN201810307500 A CN 201810307500A CN 108448653 A CN108448653 A CN 108448653A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to technical field of wind power generation, disclose a kind of control method participating in primary frequency regulation of power network based on variable sagging coefficient Wind turbines, every DFIG of droop control coefficient is can be changed using Wind turbines, respective difference coefficient is continued to optimize according to current wind speed, automatically determine the frequency modulation output depth of every unit.The present invention provides the chirping strategies that its difference coefficient is continued to optimize according to the current wind speed of every Wind turbines in wind power plant so that every Wind turbines can automatically determine its warble rate according to current spare capacity inside wind power plant；From the point of view of entire power grid frequency modulation effect, when the Wind turbines in wind power plant use different control coefrficients, wind power plant that can more fully participate in frequency modulation according to current wind speed.
Description
Technical field
The invention belongs to technical field of wind power generation, more particularly to one kind participating in electricity based on variable sagging coefficient Wind turbines
The control method of net primary frequency modulation.
Background technology
As energy crisis and environmental problem are increasingly serious, wind-powered electricity generation obtains in the world as clean regenerative resource
Unprecedented concern is arrived.In the area that THE WIND ENERGY RESOURCES IN CHINA is abundant, the permeability of wind-powered electricity generation alreadys exceed 20%, with wind-powered electricity generation
The continuous increase and the continuous improvement of permeability of installed capacity, large-scale wind power integration influence increasingly the frequency security of power grid
Show.The notice of national Wind Power Generation construction scheme in 2016, national wind in 2016 have been assigned by March, 2016, National Energy Board
Electric development ＆ construction total scale is up to 30,830,000 kilowatts.To keep Wind Power Generation to build rhythm, Wind Power Generation Industry is promoted to continue health
Development, National Energy Board strengthen the supervision of the consumption to wind-powered electricity generation.And as the permeability of wind-powered electricity generation gradually increases, it is necessary to make grid-connected
Wind-powered electricity generation assist power grid to be adjusted into line frequency, the country of some Wind Power Generation Industries prosperity at present has begun that wind power plant is required to have one
Fixed fm capacity, and the relevant wind-powered electricity generation frequency modulation technology not large-scale application in Practical Project, still also have many need
The wind-powered electricity generation chirping strategies for continuing perfect technical detail, therefore studying reasonable have the Wind Power Development of China from now on important
Meaning.In wind power plant, even in synchronization, the spatial distribution effect of Wind turbines will make every Fans receive
Different wind speed.In such a scenario, every DFIG idle capacity as the difference of wind speed and it is different.DFIG's
Coefficient of frequency modulation will determine that the frequency modulation of unit is contributed.However, the fm capacity of Wind turbines is closely related with its current wind speed, low
The off-load of wind speed section, Wind turbines is spare less, and fm capacity is limited, if excessively using the spare energy of Wind turbines off-load and turning
It is out of service that sub- kinetic energy will likely result in fan stall；And in case of elevated wind speeds, the spare comparison of off-load of Wind turbines is filled
Foot, it is possible to provide frequency modulation power it is more, fm capacity is stronger.Therefore, during wind turbine participates in frequency modulation, setting one is larger
Difference coefficient can ensure the stability run when wind turbine frequency modulation, but also result in its frequency modulation and contribute not enough, frequency modulation is ineffective.
And in order to which the frequency modulation for increasing off-load wind turbine is contributed, difference coefficient must be as low as possible.But if wind all in wind power plant
Machine is respectively provided with same low difference coefficient, and it is active that the frequency departure occurred in power grid will force all DFIG quickly to increase its
Output, if the current wind speed of unit all in wind power plant is equally sufficiently high, they can have enough as expected
Idle capacity meets the frequency modulation demand of power grid.However, if the wind speed of part fan is not sufficiently high, a same low tune
Irregular operation when poor coefficient would be possible to cause unit frequency modulation or even out of service, causes the active vacancy of bigger, makes it
Frequency modulation effect is run counter to desire.
In conclusion problem of the existing technology is：There are fm capacities to have for the fm capacity of current Wind turbines
Limit causes its frequency modulation to be contributed inadequate, and frequency modulation is ineffective, causes active vacancy.
Invention content
In view of the problems of the existing technology, the present invention provides one kind participating in electricity based on variable sagging coefficient Wind turbines
The control method of net primary frequency modulation.
The invention is realized in this way a kind of Wind turbines can be changed droop control coefficient, the Wind turbines can be changed sagging
Control coefrficient is：
In formula：Take Δ f0=0.2Hz, fNFor power grid rated frequency 50Hz, PWNFor the rated power of wind turbine, Δ PW0For unit
The reserve capacity of off-load.
Further, the unit power regulation of DFIG is：
When the n platform Wind turbines in wind power plant both participate in frequency modulation, then the equivalent unit regulation power of wind power plant is：
KWΣ=Σ KWi(i=1,2,3...n)；
In power grid when frequency of occurrences deviation delta f, the frequency modulation output of DFIG is：
Wind power plant chirping strategies based on variable control coefrficient keep every DFIG in wind power plant constantly excellent according to current wind speed
Change respective difference coefficient, to automatically determine the frequency modulation output depth of every unit, taken into account DFIG operation safety with
Frequency modulation effect；Under the conditions of actual wind speed, the wind power fluctuation of smooth wind power field is not only contributed to, and can be reached more preferable
Frequency modulation effect.
Table a is the related operation data by being obtained to DFIG operation curve interpolation, and passes through formula
Corresponding difference coefficient R is calculatedWValue.
The related data of table a off-load Wind turbines
Fig. 2 is the R that the difference coefficient being fitted to the difference coefficient in table a changes with wind speedW- v matched curves.
As can be seen from FIG. 2,
1, when wind speed is relatively low, difference coefficient is larger, may make DFIG when low wind speed section off-load is spare less, participates in adjusting
The depth of frequency reduces, to ensure the stable operation of unit frequency modulation；
2, with the increase of wind speed, the value of difference coefficient will be gradually reduced, at this time DFIG high wind speed section off-load it is spare compared with
For abundance, the warble rate of DFIG can be increased, keep frequency modulation better.
In practical wind power plant, every DFIG of interpolation calculation can be passed through according to the current wind speed of each Wind turbines
Difference coefficient under real-time wind speed, the wind power plant chirping strategies based on variable control coefrficient, can make in wind power plant every
DFIG determines the size of its frequency modulation output depth according to current wind speed in the safety margin of unit operation.
Another object of the present invention is to provide a kind of wind turbines can be changed droop control coefficient using the Wind turbines
Frequency modulation control method is organized, every DFIG of the variable droop control coefficient of Wind turbines is utilized in the Wind turbines frequency modulation control method
Respective difference coefficient is continued to optimize according to current wind speed, automatically determines the frequency modulation output depth of every unit.
Another object of the present invention is to provide a kind of wind-force hairs can be changed droop control coefficient using the Wind turbines
Motor.
The present invention provides the frequency modulation that its difference coefficient is continued to optimize according to the current wind speed of every Wind turbines in wind power plant
Strategy so that every Wind turbines can automatically determine its warble rate according to current spare capacity inside wind power plant；From entire
From the point of view of power grid frequency modulation effect, when the Wind turbines in wind power plant use different control coefrficients, wind according to current wind speed
Electric field can more fully participate in frequency modulation.Last simulation result shows the variable coefficient chirping strategies given by the present invention, can be with
The frequency modulation power inside wind power plant is reasonably distributed, and every Wind turbines in wind power plant is made more to be filled in safe operation nargin
Divide and participate in power grid frequency modulation, the output-power fluctuation of smooth wind power field is also helped in actual wind speed.
Fig. 4 is the load chart in power grid.Load increases 10MW in 70s and 80s, and 10MW is reduced in 140s,
Increase 15MW when 230s, network load maximum appears in after 230s.To be more nearly the actual wind speed situation of wind power plant, emulate
Three Wind turbines differences of medium value, the wind speed received respectively also have larger difference, as shown in Figure 5.
Fig. 6 be different wind speed under, in wind power plant the difference coefficient of each Wind turbines with wind speed situation of change, wherein
DFIG difference coefficients RWAs wind speed variation fluctuation is larger, last simulation result is as shown in Figure 7 and Figure 8.
Fig. 7 is frequency situation of change when consecutive variations occur for load and wind speed in power grid.As seen from the figure：
1, when wind power plant is using coefficient participation frequency modulation is determined, distinguish in the maximum and minimum value of 70s and 100s mains frequencies
For 50.04Hz and 49.93Hz；
2, when wind power plant participates in frequency modulation using variable coefficient, respective value is respectively 50.03Hz and 49.95Hz, dynamic frequency
Absolute value of the bias has respectively reduced 0.01Hz and 0.02Hz；
3, changing (40s, 100s, 160s and 200s) from load variations (70s, 80s, 140s and 230s) and wind speed can
See, when wind power plant participates in frequency modulation using the variable coefficient strategy of this paper, the dynamic frequency absolute value of the bias of power grid can be reduced, more
Be conducive to reduce frequency fluctuation, mains frequency is maintained to stablize.
The output situation of change of every DFIG in wind power plant is shown in Fig. 8.It can be obtained in conjunction with Fig. 6, as long as having in wind power plant
Wind speed change, then the difference coefficient of each DFIG can be achieved real-time tracking, this be also by under different wind speed DFIG it is spare
What capacity determined.
The wind speed of different units is different in wind power plant, and spare capacity is also different, then its frequency modulation task that can be undertaken is not just yet
Together.By taking Fig. 8 (c) as an example, wind speed rises when 40s and load increases when 80s, determines coefficient frequency modulation compared to traditional, and DFIG can be with
Release/absorption is more active, this is conducive to the frequency fluctuation for reducing power grid.
Influence of the wind-powered electricity generation to power grid is mainly caused by wind power wave characteristic.Therefore, it to probe into wind-powered electricity generation and participate in electricity
The frequency modulation effect of net, actual fluctuations in wind speed will cannot be ignored.All very little in the wind speed change rate most of the time in wind power plant,
Its value has reached 99.43% less than the case where 0.3m/s.In order to closer to the actual operating condition of wind power plant, now enable equivalent
The input wind speed of Wind turbines and in 80s is added gradual change and air-dries and disturb as shown in figure 9, there are gust disturbances in when setting 40s, 120s
When power grid in have the load step of 20MW.
In Figure 10, when using variable coefficient frequency modulation, frequency fluctuation is significantly less than the case where determining coefficient, when 50s and when 110s
Frequency fluctuation value in the case of two kinds has reached 50.04Hz and 50.08Hz；When using traditional when determining coefficient frequency modulation, respectively
50.08Hz and 50.16Hz, frequency departure absolute value have respectively reduced 0.04Hz and 0.08Hz, therefore using variable coefficient frequency modulation side
Method can be effectively improved the maximum value of mains frequency rising.
From Figure 11 (a) as can be seen that when big fluctuation occurs in wind speed, the rotating speed of DFIG will fluctuate in a wider context,
So that DFIG can enhance the inertial response ability of unit, the frequency for being conducive to power grid is steady with active absorption/release more energy
It is fixed.
Figure 11 (b) shows wind power plant using capability diagram when variable coefficient control under actual wind speed.In the continuous wave of wind speed
In the dynamic sections 40s-120s, the case where output-power fluctuation of wind power plant is significantly less than when determining coefficient, it was demonstrated that use variable coefficient
Frequency modulation method can be such that the output power in wind power plant is stabilized, and reduce wind power fluctuation, enhance wind power plant and power grid is becoming
Anti-interference ability under wind conditions.
Description of the drawings
Fig. 1 is the control provided in an embodiment of the present invention that primary frequency regulation of power network is participated in based on variable sagging coefficient Wind turbines
Method flow diagram.
Fig. 2 is the R of DFIG provided in an embodiment of the present inventionW- v matched curve schematic diagrames.
Fig. 3 is 3 machine, 9 node schematic diagram provided in an embodiment of the present invention.
Fig. 4 is load variations schematic diagram provided in an embodiment of the present invention.
Fig. 5 is wind speed change schematic diagram provided in an embodiment of the present invention.
Fig. 6 is double-fed fan motor unit difference coefficient change schematic diagram provided in an embodiment of the present invention.
Fig. 7 is frequency change schematic diagram provided in an embodiment of the present invention.
Fig. 8 is wind turbine output change schematic diagram provided in an embodiment of the present invention.
Fig. 9 is actual wind speed schematic diagram provided in an embodiment of the present invention.
Figure 10 is the mains frequency change schematic diagram under actual wind speed provided in an embodiment of the present invention.
Figure 11 is the DFIG response curve schematic diagrames in the case of actual wind speed 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.
The present invention makes every DFIG in wind power plant continue to optimize respective difference coefficient according to current wind speed, can determine automatically
The frequency modulation output depth of fixed every unit has taken into account safety and the frequency modulation effect of DFIG operations；Under the conditions of actual wind speed, no
Only be conducive to the wind power fluctuation of smooth wind power field, and reach better frequency modulation effect.In the frequency modulation control of wind power plant
With stronger practicability, is conducive to the wind power fluctuation of smooth wind power field, maintains the frequency stabilization of power grid.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the method that Wind turbines provided in an embodiment of the present invention can be changed droop control coefficient includes following step
Suddenly：
S101：According to the current wind speed of every Wind turbines in wind power plant and spare capacity continue to optimize DFIG it is variable under
Hang down control coefrficient；
S102：The wind power plant every Wind turbines in inside to automatically determine its frequency modulation according to current spare capacity to contribute
Depth.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
The present invention automatically determines every machine in wind power plant by the way that a variable difference coefficient is arranged according to current wind speed
Group frequency modulation output share makes the unit frequency modulation of the low wind speed of acquisition contribute few, ensures the stability of fan operation；It is high to obtain wind speed
Unit frequency modulation output is more, ensures that wind-powered electricity generation field energy has preferable frequency modulation effect.In this case, every Wind turbines will be respective
The margin of power of itself is made full use of to participate in power grid frequency modulation in the safety margin of operation.
In order to realize variable difference coefficient chirping strategies, defines and the variable difference coefficient for adjusting DFIG is：
In formula：Take Δ f0=0.2Hz, fNFor power grid rated frequency 50Hz, PWNFor the rated power of wind turbine, Δ PW0For unit
The reserve capacity of off-load, the present invention set unit off-load 20% under current wind speed and run.The unit tune of DFIG can be obtained by formula (1)
Saving power is：
When the n platform Wind turbines in wind power plant both participate in frequency modulation, then the equivalent unit regulation power of wind power plant is：
KWΣ=Σ KWi(i=1,2,3...n) (3)
In power grid when frequency of occurrences deviation delta f, the frequency modulation output of DFIG is：
Table 1 is the related operation data by being obtained to the operation curve interpolation after DFIG off-loads 20%, and passes through formula
(1) corresponding difference coefficient R is calculatedWValue.
The related data of 1 off-load Wind turbines of table
The R that can be obtained difference coefficient and change with wind speed is fitted to the difference coefficient in table 1W- v matched curve figures, such as Fig. 2
It is shown.Then as can be seen from FIG. 2, when wind speed is relatively low, the value of the difference coefficient of double-fed fan motor unit is larger, may make DFIG low
When wind speed section off-load is spare less, participating in the depth of frequency modulation reduces, and ensures the stable operation of unit frequency modulation；And with the increasing of wind speed
Add, the value of difference coefficient will be gradually reduced, and DFIG is spare more sufficient in high wind speed section off-load at this time, can increase DFIG's
Warble rate, frequency modulation are better.At this point, in wind power plant, interpolation meter can be passed through according to the current wind speed of each unit
The difference coefficient under the real-time wind speed of every DFIG is calculated, can make in wind power plant every DFIG according to current wind speed in unit operation
Determine that it determines its frequency modulation output depth in safety margin.
The application effect of the present invention is explained in detail with reference to emulation.
The present invention is to verify the validity of chirping strategies, is saved using 3 machines 9 that MATLAB/SIMULINK simulation softwares establish
Point electric network model, as shown in Figure 3.The electric network model includes the synchronous generator and a wind-powered electricity generation for 200MW by 2 rated power
Field composition, accesses B8The wind power plant of busbar is made of three equivalence DFIG, and capacity is respectively 40MW, 60MW and 100MW, L1、L2With
L3Respectively trizonal load.In this model, DFIG wind turbines off-load 20% is run.Emulation is respectively in ideal wind speed and reality
It is carried out under the wind friction velocity of border.
Simulation analysis under 1 ideal wind speed
Fig. 4 is the load chart in power grid, and load increases 10MW in 70s and 80s, 10MW is reduced in 140s,
Increase 15MW when 230s, network load maximum appears in after 230s.To be more nearly the actual wind speed situation of wind power plant, emulate
Three Wind turbines differences of medium value, the wind speed received respectively also have larger difference, as shown in Figure 5.
Fig. 6 be different wind speed under, in wind power plant the difference coefficient of each Wind turbines with wind speed situation of change, wherein
DFIG difference coefficients RWAs wind speed variation fluctuation is larger, last simulation result is as shown in Figure 7 and Figure 8.
Fig. 7 is frequency situation of change when consecutive variations occur for load and wind speed in power grid.As seen from the figure, wind power plant is adopted
Frequency modulation is participated in coefficient is determined, is respectively 50.04Hz and 49.93Hz in the maximum and minimum value of 70s and 100s mains frequencies；And it adopts
Be respectively 50.03Hz and 49.95Hz with respective value when variable coefficient, dynamic frequency absolute value of the bias respectively reduced 0.01Hz and
0.02Hz.And when changing (40s, 100s, 160s and 200s) from load variations (70s, 80s, 140s and 230s) and wind speed
As it can be seen that when wind power plant variable coefficient strategy using the present invention participates in frequency modulation, the dynamic frequency absolute value of the bias of power grid can be reduced,
It is more advantageous to reduction frequency fluctuation, mains frequency is maintained to stablize.
The output situation of change of every DFIG in wind power plant is shown in Fig. 8.It can be obtained in conjunction with Fig. 6, as long as when in wind power plant
There is wind speed variation, the difference coefficient of each DFIG can be with real-time tracking, this is also by the spare appearance of DFIG under different wind speed
What amount determined.The wind speed of different units is different in wind power plant, and spare capacity is also different, then its frequency modulation task that can be undertaken is not just yet
Together.By taking Fig. 8 (c) as an example, wind speed rises when 40s and load increases when 80s, determines coefficient frequency modulation compared to traditional, and DFIG can be with
Release/absorption is more active, this contributes to the frequency fluctuation for reducing power grid, the simulation result of Fig. 8 substantially with theory expectation phase
Symbol.
Simulation analysis under 2 actual wind speeds
Influence of the wind-powered electricity generation to power grid mainly caused by wind power wave characteristic, therefore, will probe into wind-powered electricity generation and participate in electricity
The frequency modulation effect of net, actual fluctuations in wind speed will cannot be ignored.And wind speed change rate very little in the most of the time in wind power plant,
Wind speed change rate has reached 99.43% less than the case where 0.3m/s, in order to be more nearly the situation of wind power plant reality, now enables equivalent
The input wind speed of Wind turbines and in 80s is added gradual change and air-dries and disturb as shown in figure 9, there are gust disturbances in when setting 40s, 120s
When power grid in have the load step of 20MW.
In Figure 10, when using variable coefficient frequency modulation, frequency fluctuation is significantly less than the case where determining coefficient, when 50s and when 110s
Frequency fluctuation value in the case of two kinds has reached 50.04Hz and 50.08Hz, and using traditional when determining coefficient frequency modulation, respectively
50.08Hz and 50.16Hz, frequency departure absolute value have respectively reduced 0.04Hz and 0.08Hz, can be effectively improved mains frequency
The maximum value of rising.
From Figure 11 (a) as can be seen that when big fluctuation occurs in wind speed, the rotating speed of DFIG will fluctuate in a wider context,
So that DFIG can enhance the inertial response ability of unit, the frequency for being conducive to power grid is steady with active absorption/release more energy
It is fixed.Figure 11 (b) shows that wind power plant controls the capability diagram under actual wind speed using variable coefficient, in the 40s- that wind speed constantly fluctuates
In the sections 120s, the case where output-power fluctuation of wind power plant is significantly less than when determining coefficient, it was demonstrated that the output power in wind power plant
It is stabilized, reduces wind power fluctuation, the anti-interference ability of enhancing wind power plant and power grid in the case where becoming wind conditions.
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 (4)
1. a kind of Wind turbines can be changed droop control coefficient, which is characterized in that the Wind turbines can be changed droop control coefficient and be：
In formula：Take Δ f0=0.2Hz, fNFor power grid rated frequency 50Hz, PWNFor the rated power of wind turbine, Δ PW0For unit off-load
Reserve capacity.
2. Wind turbines as described in claim 1 can be changed droop control coefficient, which is characterized in that the unit power regulation of DFIG
For：
When the n platform Wind turbines in wind power plant both participate in frequency modulation, then the equivalent unit regulation power of wind power plant is：
KWΣ=Σ KWi(i=1,2,3...n)；
In power grid when frequency of occurrences deviation delta f, the frequency modulation output of DFIG is：
3. it is a kind of using Wind turbines described in claim 1 can be changed droop control coefficient based on variable sagging coefficient Wind turbines
Participate in the control method of primary frequency regulation of power network, which is characterized in that Wind turbines are utilized in the Wind turbines frequency modulation control method
Variable every DFIG of droop control coefficient continues to optimize respective difference coefficient according to current wind speed, automatically determines every unit
Frequency modulation output depth.
4. a kind of wind-driven generator can be changed droop control coefficient using Wind turbines described in claim 1~2 any one.
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| CN111092439A (en) * | 2018-10-24 | 2020-05-01 | 中国电力科学研究院有限公司 | Method and device for adjusting primary frequency modulation coefficient of wind turbine generator |
| CN111092439B (en) * | 2018-10-24 | 2024-04-12 | 中国电力科学研究院有限公司 | Primary frequency modulation coefficient adjustment method and device for wind turbine generator |
| 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 |
| CN109494769A (en) * | 2019-01-07 | 2019-03-19 | 华北电力大学 | A kind of wind field participates in frequency modulation method and system |
| CN111064228A (en) * | 2020-01-16 | 2020-04-24 | 江苏方天电力技术有限公司 | Wind turbine generator droop control method and system considering wind speed and load change scene and computer equipment |
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