CN107069767A - A kind of method and system for improving reactive power compensator control accuracy - Google Patents
A kind of method and system for improving reactive power compensator control accuracy Download PDFInfo
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- CN107069767A CN107069767A CN201710372066.7A CN201710372066A CN107069767A CN 107069767 A CN107069767 A CN 107069767A CN 201710372066 A CN201710372066 A CN 201710372066A CN 107069767 A CN107069767 A CN 107069767A
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- 238000009434 installation Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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Classifications
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a kind of method and system for improving reactive power compensator control accuracy；It the described method comprises the following steps：S1, each reactive power compensator of setting response dead band；S2, obtain having work value and calculating the target of each blower fan without work value Qf without real-time voltage value, grid entry point voltage-target in work value, wind power plant, and according to it without work value, each reactive power compensator for each blower fan in wind power plantjTarget with each reactive power compensator is without work value Qtari；S3, to target without work value QtariDesired value amendment is not carried out in its reactive power compensator responded in dead band obtain revised target without work value Qtar'i；S4, the target of the revised reactive power compensator of the reactive power compensator in step S3 are without work value Qtar'iDesired value amendment is carried out to each blower fan and obtains revised target without work value Qf'j；S5, by revised each blower fan target without work value Qf'jDistribute to each blower fan, revised each reactive power compensator target without work value Qtar'iDistribute to each reactive power compensator.
Description
Technical field
Essence is controlled the present invention relates to reactive power compensator control technology field, more particularly to a kind of reactive power compensator that improves
The method and system of degree.
Background technology
Wind-power electricity generation has obtained sending out energetically in recent years as technology one of renewable energy power generation mode of maturation the most
Exhibition.The abundant area of some wind-resources, the ratio that Wind turbines installed capacity accounts for power network total installation of generating capacity is increasing, wherein without
One of the problem of work(voltage problem is exactly most prominent and of greatest concern.
The characteristics of wind generator system, determines that wind power plant is necessarily required to install reactive power compensator additional.Wind-powered electricity generation field voltage is controlled automatically
System (AVC) reaches regulation and control grid entry point voltage by controlling wind power plant inner blower and the idle of dynamic reactive compensation device to exert oneself
Effect, makes grid entry point voltage reach the given target of scheduling.
The reactive power compensator of existing main flow has response dead band near zero-crossing point, typically -1MVar to 1MVar it
Between, for the Target of Reactive Power value in response dead band, reactive power compensator is not performed.AVC systems are usually not considered
This dead band, if wind power plant Capacity Ratio is larger, in the case that reactive power compensator is more, it is possible to have control deviation, wind
Idle exert oneself of the full factory of electric field does not reach the given desired value of AVC systems, and grid entry point voltage does not reach the given voltage model of scheduling
Enclose.
The content of the invention
The technical problem existed based on background technology, the present invention proposes a kind of raising reactive power compensator control accuracy
Method and system.
The method proposed by the present invention for improving reactive power compensator control accuracy, comprises the following steps：
S1, each reactive power compensator of setting response dead band；
S2, obtain wind power plant in each blower fan have work value and without work value, each reactive power compensator without in work value, wind power plant
Real-time voltage value, grid entry point voltage-target, and according in wind power plant each blower fan have work value and without work value, each reactive-load compensation fill
That puts calculates the target of each blower fan without work value Qf without real-time voltage value, grid entry point voltage-target in work value, wind power plantjWith each nothing
The target of Reactive power compensation installations is without work value Qtari；
S3, judge the target of each reactive power compensator without work value QtariWhether responded at it in dead band, and idle to target
Value QtariDesired value amendment is not carried out in its reactive power compensator responded in dead band obtain revised target without work value
Qtar'i；
S4, the target of the revised reactive power compensator of the reactive power compensator in step S3 are without work value Qtar'iIt is right
Each blower fan carries out desired value amendment and obtains revised target without work value Qf'j；
S5, by revised each blower fan target without work value Qf'jDistribute to each blower fan, revised each reactive power compensator
Target without work value Qtar'iDistribute to each reactive power compensator；
Wherein, i=1,2,3 ... n, j=1,2,3 ... m.
Preferably, step S2 is specifically included：
According to needed for real-time voltage value in wind power plant and grid entry point voltage-target calculate wind power plant idle increment, according to wind
Each blower fan has work value to calculate the idle adjustable extent of each blower fan in electric field, and idle, blower fan is preferentially undertaken according still further to blower fan and is undertaken
The principle undertaken without the distribution of work to reactive power compensator not, is each blower fan and each reactive power compensator distribution nothing in wind power plant
Work(, to obtain the target of each blower fan without work value QfjTarget with each reactive power compensator is without work value Qtari。
Preferably, step S3 is specifically included：
If the target of reactive power compensator is not responded in dead band without work value at it, the target of the reactive power compensator is idle
Value need not be corrected, i.e., the target of the reactive power compensator is without work value Qtar'i=Qtari；
If the target of reactive power compensator is responded in dead band without work value at it, the target of the reactive power compensator is without work value
Amendment is needed, and the reactive power compensator is included in set to be modified；
The response dead band of each reactive power compensator is set, [BORDER is designated asUnder i, BORDEROn i]；
Each reactive power compensator treated in amendment set carries out desired value amendment；
The First reactive power compensator in set to be modified is chosen, judges the reactive power compensator target without work value
QtariWith the distance at two edges for responding dead band：
If | Qtari-BORDERUnder i|<=| Qtari-BORDEROn i|, then the revised target of the reactive power compensator is idle
Value Qtar'i=BORDERUnder i；
If | Qtari-BORDERUnder i|>|Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDEROn i；
The idle increment for now needing other reactive power compensators to undertake is designated as QΔ=Qtari-Qtar'i；
Second reactive power compensator in set to be modified is chosen again, by above-mentioned idle increment QΔDistribute to the idle benefit
Repay device to undertake, draw the target of the reactive power compensator without work value Qtar*k=Qtark+QΔ；Judge the reactive power compensator mesh
Mark is without work value Qtar*kWith the distance at two edges for responding dead band：
If | Qtar*k–BORDERUnder k|<=| Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator without
Work value Qtar'k=BORDERUnder k；
If | Qtar*k-BORDERUnder k|>|Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is idle
Value Qtar'k=BORDEROn k；
The idle incremental update for now needing other reactive power compensators to undertake is QΔ=Qtar*k-Qtar'k；
So circulation, treats all reactive power compensators in amendment set and carries out desired value amendment, and record last successively
Once idle increment QΔ。
Preferably, step S4 is specifically included：
According to the idle increment Q of last time in step S3ΔDesired value amendment, revised each blower fan mesh are carried out to each blower fan
Mark is without work value Qf'j=Qfj+QΔ。
The system proposed by the present invention for improving reactive power compensator control accuracy, including：
Dead band setting module, the response dead band for setting each reactive power compensator；
Idle computing module, has work value and without work value, each reactive power compensator for obtain each blower fan in wind power plant
There is work value and idle without real-time voltage value, grid entry point voltage-target in work value, wind power plant, and according to each blower fan in wind power plant
Value, the target that each blower fan is calculated without real-time voltage value, grid entry point voltage-target in work value, wind power plant of each reactive power compensator
Without work value QfjTarget with each reactive power compensator is without work value Qtari；
First correcting module, for judging the target of each reactive power compensator without work value QtariWhether dead band is responded at it
It is interior, and to target without work value QtariNot after its reactive power compensator progress desired value amendment responded in dead band obtains amendment
Target without work value Qtar'i；
Second correcting module, for according to the revised reactive power compensator of reactive power compensator in the first correcting module
Target is without work value Qtar'iDesired value amendment is carried out to each blower fan and obtains revised target without work value Qf'j；
Regulate and control module, for by revised each blower fan target without work value Qf'jDistribute to each blower fan, revised each nothing
The target of Reactive power compensation installations is without work value Qtar'iDistribute to each reactive power compensator.
Preferably, idle computing module specifically for：
According to needed for real-time voltage value in wind power plant and grid entry point voltage-target calculate wind power plant idle increment, according to wind
Each blower fan has work value to calculate the idle adjustable extent of each blower fan in electric field, and idle, blower fan is preferentially undertaken according still further to blower fan and is undertaken
The principle undertaken without the distribution of work to reactive power compensator not, is each blower fan and each reactive power compensator distribution nothing in wind power plant
Work(, to obtain the target of each blower fan without work value QfjTarget with each reactive power compensator is without work value Qtari。
Preferably, the first correcting module specifically for：
If the target of reactive power compensator is not responded in dead band without work value at it, the target of the reactive power compensator is idle
Value need not be corrected, i.e., the target of the reactive power compensator is without work value Q'itar=Qitar；
If the target of reactive power compensator is responded in dead band without work value at it, the target of the reactive power compensator is without work value
Amendment is needed, and the reactive power compensator is included in set to be modified；
The response dead band of each reactive power compensator is set, [BORDER is designated asUnder i, BORDEROn i]；
Each reactive power compensator treated in amendment set carries out desired value amendment；
The First reactive power compensator in set to be modified is chosen, judges the reactive power compensator target without work value
QtariWith the distance at two edges for responding dead band：
If | Qtari-BORDERUnder i|<=| Qtari-BORDEROn i|, then the revised target of the reactive power compensator is idle
Value Qtar'i=BORDERUnder i；
If | Qtari-BORDERUnder i|>|Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDEROn i；
The idle increment for now needing other reactive power compensators to undertake is designated as QΔ=Qtari-Qtar'i；
Second reactive power compensator in set to be modified is chosen again, by above-mentioned idle increment QΔDistribute to the idle benefit
Repay device to undertake, draw the target of the reactive power compensator without work value Qtar*k=Qtark+QΔ；Judge the reactive power compensator mesh
Mark is without work value Qtar*kWith the distance at two edges for responding dead band：
If | Qtar*k–BORDERUnder k|<=| Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator without
Work value Qtar'k=BORDERUnder k；
If | Qtar*k-BORDERUnder k|>|Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is idle
Value Qtar'k=BORDEROn k；
The idle incremental update for now needing other reactive power compensators to undertake is QΔ=Qtar*k-Qtar'k；
So circulation, treats all reactive power compensators in amendment set and carries out desired value amendment, and record last successively
Once idle increment QΔ。
Preferably, the second correcting module specifically for：
The idle increment Q of last time recorded according to the first correcting moduleΔDesired value amendment is carried out to each blower fan, after amendment
Each blower fan target without work value Qf'j=Qfj+QΔ。
The present invention devises a kind of method and system of reactive power compensator control accuracy, matches somebody with somebody in wind power plant varmeter point counting
In, make the target of reactive power compensator without work value outside the response dead zone range of setting, so that each reactive-load compensation dress
The desired value that putting can give according to AVC systems is performed in place so that grid entry point voltage can be stablized in desired control targe
Within；It is dead that the method and system of reactive power compensator control accuracy proposed by the present invention avoid reactive power compensator from being operated in response
Area, improves the AVC systems control accuracy exerted oneself idle to wind power plant so that grid entry point voltage can be stablized in the given voltage of scheduling
In the range of.
Brief description of the drawings
Fig. 1 is a kind of step schematic diagram for the method for improving reactive power compensator control accuracy；
Fig. 2 is a kind of structural representation for the system for improving reactive power compensator control accuracy.
Embodiment
As shown in Figure 1 and Figure 2, Fig. 1, Fig. 2 are a kind of method for improving reactive power compensator control accuracy proposed by the present invention
And system.
Reference picture 1, it is proposed by the present invention improve reactive power compensator control accuracy method, it is characterised in that including with
Lower step：
S1, the actual performance according to each free compensation device, set the response dead band of each reactive power compensator, are designated as
[BORDERUnder i, BORDEROn i], in this way, the specific aim and accuracy in the response dead band of setting can be improved；
S2, obtain wind power plant in each blower fan have work value and without work value, each reactive power compensator without in work value, wind power plant
Real-time voltage value, grid entry point voltage-target；And according in wind power plant each blower fan have work value and without work value, each reactive-load compensation fill
That puts calculates the target of each blower fan without work value Qf without real-time voltage value, grid entry point voltage-target in work value, wind power plantjWith each nothing
The target of Reactive power compensation installations is without work value Qtari；
Specifically：It is idle according to needed for real-time voltage value in wind power plant and grid entry point voltage-target calculate wind power plant to increase
Amount, according to each blower fan in wind power plant there is the work value to calculate the idle adjustable extent of each blower fan, preferentially undertaken according still further to blower fan it is idle,
The principle undertaken without the distribution of work to reactive power compensator that blower fan does not undertake, is each blower fan and each reactive-load compensation dress in wind power plant
Distribution is put idle, to obtain the target of each blower fan without work value QfjTarget with each reactive power compensator is without work value Qtari。
S3, judge the target of each reactive power compensator without work value QtariWhether responded at it in dead band, and idle to target
Value QtariDesired value amendment is not carried out in its reactive power compensator responded in dead band obtain revised target without work value
Qtar'i；
Specific deterministic process includes：
If the target of reactive power compensator is not responded in dead band without work value at it, the target of the reactive power compensator is idle
Value need not be corrected, i.e., the target of the reactive power compensator is without work value Qtar'i=Qtari；
If the target of reactive power compensator is responded in dead band without work value at it, the target of the reactive power compensator is without work value
Amendment is needed, and the reactive power compensator is included in set to be modified；
Specific makeover process includes：
The response dead band of each reactive power compensator is set, [BORDER is designated asUnder i, BORDEROn i]；
Each reactive power compensator treated in amendment set carries out desired value amendment；
The First reactive power compensator in set to be modified is chosen, judges the reactive power compensator target without work value
QtariWith the distance at two edges for responding dead band：
If | Qtari-BORDERUnder i|<=| Qtari-BORDEROn i|, then the revised target of the reactive power compensator is idle
Value Qtar'i=BORDERUnder i；
If | Qtari-BORDERUnder i|>|Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDEROn i；
The idle increment for now needing other reactive power compensators to undertake is designated as QΔ=Qtari-Qtar'i；
Second reactive power compensator in set to be modified is chosen again, by above-mentioned idle increment QΔDistribute to the idle benefit
Repay device to undertake, draw the target of the reactive power compensator without work value Qtar*k=Qtark+QΔ；Judge the reactive power compensator mesh
Mark is without work value Qtar*kWith the distance at two edges for responding dead band：
If | Qtar*k–BORDERUnder k|<=| Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator without
Work value Qtar'k=BORDERUnder k；
If | Qtar*k-BORDERUnder k|>|Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is idle
Value Qtar'k=BORDEROn k；
The idle incremental update for now needing other reactive power compensators to undertake is QΔ=Qtar*k-Qtar'k；
So circulation, treats all reactive power compensators in amendment set and carries out desired value amendment, and record last successively
Once idle increment QΔ。
S4, the target of the revised reactive power compensator of the reactive power compensator in step S3 are without work value Qtar'iIt is right
Each blower fan carries out desired value amendment and obtains revised target without work value Qf'j；
Specifically：According to the idle increment Q of last time in step S3ΔDesired value amendment is carried out to each blower fan, it is revised
Each blower fan target is without work value Qf'j=Qfj+QΔ。
S5, by revised each blower fan target without work value Qf'jDistribute to each blower fan, revised each reactive power compensator
Target without work value Qtar'iDistribute to each reactive power compensator；By by the target of each blower fan without work value be issued to each blower fan,
The target of each reactive power compensator is issued to each reactive power compensator without work value so that each blower fan and each reactive power compensator according to
Respective target is run and worked without work value, improves the operating efficiency and work essence of each blower fan and each reactive power compensator
Degree.
Wherein, i=1,2,3 ... n, j=1,2,3 ... m, n and m value are mended with specific reference to idle in actual application
The number for repaying device and blower fan is set.
Reference picture 2, a kind of system for improving reactive power compensator control accuracy proposed by the present invention, including：
Dead band setting module, the response dead band for setting each reactive power compensator, is designated as [BORDERUnder i, BORDEROn i]；
Parameter acquisition module, has work value and without work value, each reactive power compensator for obtain each blower fan in wind power plant
Without real-time voltage value, grid entry point voltage-target in work value, wind power plant；
Idle computing module, has work value and without work value, each reactive power compensator for obtain each blower fan in wind power plant
There is work value and idle without real-time voltage value, grid entry point voltage-target in work value, wind power plant, and according to each blower fan in wind power plant
Value, the target that each blower fan is calculated without real-time voltage value, grid entry point voltage-target in work value, wind power plant of each reactive power compensator
Without work value QfjTarget with each reactive power compensator is without work value Qtari；
Idle computing module specifically for：
According to needed for real-time voltage value in wind power plant and grid entry point voltage-target calculate wind power plant idle increment, according to wind
Each blower fan has work value to calculate the idle adjustable extent of each blower fan in electric field, and idle, blower fan is preferentially undertaken according still further to blower fan and is undertaken
The principle undertaken without the distribution of work to reactive power compensator not, is each blower fan and each reactive power compensator distribution nothing in wind power plant
Work(, to obtain the target of each blower fan without work value QfjTarget with each reactive power compensator is without work value Qtari。
First correcting module, for judging the target of each reactive power compensator without work value QtariWhether dead band is responded at it
It is interior, and to target without work value QtariNot after its reactive power compensator progress desired value amendment responded in dead band obtains amendment
Target without work value Qtar'i；
Deterministic process in first correcting module includes：
If the target of reactive power compensator is not responded in dead band without work value at it, the target of the reactive power compensator is idle
Value need not be corrected, i.e., the target of the reactive power compensator is without work value Qtar'i=Qtari；
If the target of reactive power compensator is responded in dead band without work value at it, the target of the reactive power compensator is without work value
Amendment is needed, and the reactive power compensator is included in set to be modified；
Specific makeover process includes：
The response dead band of each reactive power compensator is set, [BORDER is designated asUnder i, BORDEROn i]；
Each reactive power compensator treated in amendment set carries out desired value amendment；
The First reactive power compensator in set to be modified is chosen, judges the reactive power compensator target without work value
QtariWith the distance at two edges for responding dead band：
If | Qtari-BORDERUnder i|<=| Qtari-BORDEROn i|, then the revised target of the reactive power compensator is idle
Value Qtar'i=BORDERUnder i；
If | Qtari-BORDERUnder i|>|Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDEROn i；
The idle increment for now needing other reactive power compensators to undertake is designated as QΔ=Qtari-Qtar'i；
Second reactive power compensator in set to be modified is chosen again, by above-mentioned idle increment QΔDistribute to the idle benefit
Repay device to undertake, draw the target of the reactive power compensator without work value Qtar*k=Qtark+QΔ；Judge the reactive power compensator mesh
Mark is without work value Qtar*kWith the distance at two edges for responding dead band：
If | Qtar*k–BORDERUnder k|<=| Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator without
Work value Qtar'k=BORDERUnder k；
If | Qtar*k-BORDERUnder k|>|Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is idle
Value Qtar'k=BORDEROn k；
The idle incremental update for now needing other reactive power compensators to undertake is QΔ=Qtar*k-Qtar'k；
So circulation, treats all reactive power compensators in amendment set and carries out desired value amendment, and record last successively
Once idle increment QΔ。
Second correcting module, for according to the revised reactive power compensator of reactive power compensator in the first correcting module
Target is without work value Qtar'iDesired value amendment is carried out to each blower fan and obtains revised target without work value Qf'j；
Second correcting module specifically for：
The idle increment Q of last time recorded according to the first correcting moduleΔDesired value amendment is carried out to each blower fan, after amendment
Each blower fan target without work value Qf'j=Qfj+QΔ。
Regulate and control module, for by revised each blower fan target without work value Qf'jDistribute to each blower fan, revised each nothing
The target of Reactive power compensation installations is without work value Qtar'iDistribute to each reactive power compensator；By the way that the target of each blower fan is issued without work value
Target to each blower fan, each reactive power compensator without work value is issued to each reactive power compensator so that each blower fan and each idle mend
Repay device to be run and worked without work value according to respective target, improve the operating efficiency of each blower fan and each reactive power compensator
And operating accuracy.
Present embodiment devises a kind of method and system of reactive power compensator control accuracy, in the idle calculating of wind power plant
In distribution, make the target of reactive power compensator without work value outside the response dead zone range of setting, so that each idle to mend
The desired value that repaying device can give according to AVC systems is performed in place so that grid entry point voltage can be stablized in desired control
Within target；The method and system for the reactive power compensator control accuracy that present embodiment is proposed avoid reactive power compensator from working
In response dead band, the AVC systems control accuracy exerted oneself idle to wind power plant is improved so that grid entry point voltage, which can be stablized, to be scheduled to
In fixed voltage range.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (8)
1. a kind of method for improving reactive power compensator control accuracy, it is characterised in that comprise the following steps：
S1, each reactive power compensator of setting response dead band；
S2, obtain wind power plant in each blower fan have work value and without work value, each reactive power compensator without in work value, wind power plant in real time
Magnitude of voltage, grid entry point voltage-target, and work value is had and without work value, each reactive power compensator according to each blower fan in wind power plant
The target of each blower fan is calculated without work value Qf without real-time voltage value, grid entry point voltage-target in work value, wind power plantjWith each idle benefit
The target of device is repaid without work value Qtari；
S3, judge the target of each reactive power compensator without work value QtariWhether responded at it in dead band, and to target without work value
QtariDesired value amendment is not carried out in its reactive power compensator responded in dead band obtain revised target without work value Qtar'i；
S4, the target of the revised reactive power compensator of the reactive power compensator in step S3 are without work value Qtar'iTo each wind
Machine carries out desired value amendment and obtains revised target without work value Qf'j；
S5, by revised each blower fan target without work value Qf'jDistribute to the target of each blower fan, revised each reactive power compensator
Without work value Qtar'iDistribute to each reactive power compensator；
Wherein, i=1,2,3 ... n, j=1,2,3 ... m.
2. the method according to claim 1 for improving reactive power compensator control accuracy, it is characterised in that step S2 is specific
Including：
According to needed for real-time voltage value in wind power plant and grid entry point voltage-target calculate wind power plant idle increment, according to wind power plant
The idle adjustable extent for having each blower fan of work value calculating of interior each blower fan, idle, blower fan is preferentially undertaken according still further to blower fan and is not undertaken
The principle undertaken without the distribution of work to reactive power compensator, be in wind power plant each blower fan and each reactive power compensator distribution it is idle,
To obtain the target of each blower fan without work value QfjTarget with each reactive power compensator is without work value Qtari。
3. the method according to claim 1 for improving reactive power compensator control accuracy, it is characterised in that step S3 is specific
Including：
If the target of reactive power compensator is not responded in dead band without work value at it, the target of the reactive power compensator without work value not
Amendment is needed, i.e., the target of the reactive power compensator is without work value Qtar'i=Qtari；
If the target of reactive power compensator is responded in dead band without work value at it, the target of the reactive power compensator needs without work value
Amendment, and the reactive power compensator is included in set to be modified；
The response dead band of each reactive power compensator is set, [BORDER is designated asUnder i, BORDEROn i]；
Each reactive power compensator treated in amendment set carries out desired value amendment；
The First reactive power compensator in set to be modified is chosen, judges the reactive power compensator target without work value QtariWith sound
Answer the distance at two edges in dead band：
If | Qtari-BORDERUnder i|<=| Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDERUnder i；
If | Qtari-BORDERUnder i|>|Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDEROn i；
The idle increment for now needing other reactive power compensators to undertake is designated as QΔ=Qtari-Qtar'i；
Second reactive power compensator in set to be modified is chosen again, by above-mentioned idle increment QΔDistribution to the reactive-load compensation is filled
Put and undertake, draw the target of the reactive power compensator without work value Qtar*k=Qtark+QΔ；Judge the reactive power compensator target without
Work value Qtar*kWith the distance at two edges for responding dead band：
If | Qtar*k–BORDERUnder k|<=| Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is without work value
Qtar'k=BORDERUnder k；
If | Qtar*k-BORDERUnder k|>|Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is without work value
Qtar'k=BORDEROn k；
The idle incremental update for now needing other reactive power compensators to undertake is QΔ=Qtar*k-Qtar'k；
So circulation, treats all reactive power compensators in amendment set and carries out desired value amendment, and record last time successively
Idle increment QΔ。
4. the method according to claim 3 for improving reactive power compensator control accuracy, it is characterised in that step S4 is specific
Including：
According to the idle increment Q of last time in step S3ΔTo each blower fan carry out desired value amendment, revised each blower fan target without
Work value Qf'j=Qfj+QΔ。
5. a kind of system for improving reactive power compensator control accuracy, it is characterised in that including：
Dead band setting module, the response dead band for setting each reactive power compensator；
Idle computing module, for obtain each blower fan in wind power plant have work value and without work value, each reactive power compensator it is idle
Value, real-time voltage value, grid entry point voltage-target in wind power plant, and according in wind power plant each blower fan have work value and without work value,
Each reactive power compensator without real-time voltage value in work value, wind power plant, grid entry point voltage-target calculate the target of each blower fan without
Work value QfjTarget with each reactive power compensator is without work value Qtari；
First correcting module, for judging the target of each reactive power compensator without work value QtariWhether responded at it in dead band, and
To target without work value QtariDesired value amendment is not carried out in its reactive power compensator responded in dead band obtain revised target
Without work value Qtar'i；
Second correcting module, for the target according to the revised reactive power compensator of reactive power compensator in the first correcting module
Without work value Qtar'iDesired value amendment is carried out to each blower fan and obtains revised target without work value Qf'j；
Regulate and control module, for by revised each blower fan target without work value Qf'jDistribute to each blower fan, revised each reactive-load compensation
The target of device is without work value Qtar'iDistribute to each reactive power compensator.
6. the system according to claim 5 for improving reactive power compensator control accuracy, it is characterised in that idle calculating mould
Block specifically for：
According to needed for real-time voltage value in wind power plant and grid entry point voltage-target calculate wind power plant idle increment, according to wind power plant
The idle adjustable extent for having each blower fan of work value calculating of interior each blower fan, idle, blower fan is preferentially undertaken according still further to blower fan and is not undertaken
The principle undertaken without the distribution of work to reactive power compensator, be in wind power plant each blower fan and each reactive power compensator distribution it is idle,
To obtain the target of each blower fan without work value QfjTarget with each reactive power compensator is without work value Qtari。
7. the system according to claim 5 for improving reactive power compensator control accuracy, it is characterised in that the first amendment mould
Block specifically for：
If the target of reactive power compensator is not responded in dead band without work value at it, the target of the reactive power compensator without work value not
Amendment is needed, i.e., the target of the reactive power compensator is without work value Qtar'i=Qtari；
If the target of reactive power compensator is responded in dead band without work value at it, the target of the reactive power compensator needs without work value
Amendment, and the reactive power compensator is included in set to be modified；
The response dead band of each reactive power compensator is set, [BORDER is designated asUnder i, BORDEROn i]；
Each reactive power compensator treated in amendment set carries out desired value amendment；
The First reactive power compensator in set to be modified is chosen, judges the reactive power compensator target without work value QtariWith sound
Answer the distance at two edges in dead band：
If | Qtari-BORDERUnder i|<=| Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDERUnder i；
If | Qtari-BORDERUnder i|>|Qtari-BORDEROn i|, then the revised target of the reactive power compensator is without work value
Qtar'i=BORDEROn i；
The idle increment for now needing other reactive power compensators to undertake is designated as QΔ=Qtari-Qtar'i；
Second reactive power compensator in set to be modified is chosen again, by above-mentioned idle increment QΔDistribution to the reactive-load compensation is filled
Put and undertake, draw the target of the reactive power compensator without work value Qtar*k=Qtark+QΔ；Judge the reactive power compensator target without
Work value Qtar*kWith the distance at two edges for responding dead band：
If | Qtar*k–BORDERUnder k|<=| Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is without work value
Qtar'k=BORDERUnder k；
If | Qtar*k-BORDERUnder k|>|Qtar*k-BORDEROn k|, then the revised target of the reactive power compensator is without work value
Qtar'k=BORDEROn k；
The idle incremental update for now needing other reactive power compensators to undertake is QΔ=Qtar*k-Qtar'k；
So circulation, treats all reactive power compensators in amendment set and carries out desired value amendment, and record last time successively
Idle increment QΔ。
8. the system according to claim 7 for improving reactive power compensator control accuracy, it is characterised in that the second amendment mould
Block specifically for：
The idle increment Q of last time recorded according to the first correcting moduleΔDesired value amendment is carried out to each blower fan, it is revised each
Blower fan target is without work value Qf'j=Qfj+QΔ。
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