CN105305454B - A kind of static synchronous compensating device voltage powerless control method suitable for wind power plant - Google Patents
A kind of static synchronous compensating device voltage powerless control method suitable for wind power plant Download PDFInfo
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- CN105305454B CN105305454B CN201410275733.6A CN201410275733A CN105305454B CN 105305454 B CN105305454 B CN 105305454B CN 201410275733 A CN201410275733 A CN 201410275733A CN 105305454 B CN105305454 B CN 105305454B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
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Abstract
The present invention relates to static synchronous compensating device control fields, to be suitable for wind power plant, with wind farm grid-connected voltage target in order to control, a kind of static synchronous compensating device control method of System Reactive Power level, specially a kind of static synchronous compensating device voltage powerless control method suitable for wind power plant are taken into account simultaneously.Static synchronous compensating device is installed in wind farm low voltage bus bar side, monitors grid entry point system voltage U in real timeSWith idle QS, and according to different USAnd QSLevel compares control targe selection strategy table, according to different compensation targets, analysis system realtime power situation and reactive requirement, so that it is determined that the adjustable strategies of passive filter branch and static synchronous compensating device.
Description
Technical field
It is specially a kind of Static Synchronous benefit suitable for wind power plant the present invention relates to static synchronous compensating device control field
Repay device voltage powerless control method.
Background technology
Due to the intermittence and randomness of wind energy, the active and reactive trend of wind power plant changes frequent occurrence, is easy to happen voltage
Stablize accident, and with the increase of wind power plant scale, the influence to power grid is also further serious.The electricity of wind farm grid-connected operation
Energy quality problems can be solved by wind power plant reactive power compensation to some extent, to safeguard the idle of wind power plant
Balance, it is necessary to reactive power compensation be carried out to it in real time.
Static synchronous compensating device can realize quick, smooth, controllable nothing by adjusting itself perception or capacity current
Reactive power compensator is used widely in wind power plant.The research of existing static synchronous compensating device voltage control strategy is mostly root
According to high side bus voltage rated value, determine needed for total idle output desired value, further according to general reactive power compensator without
Total reactive power is distributed to every group of perception branch and capacitive branch, does not have detailed analysis reactive-load compensation equipment by distribution of work principle
Actual operating mode, the considerations of also lacking to actual motion Reactive Compensation in Wind Farm equipment particular/special requirement.In addition, existing wind
Electric field management resourcefulness is requirement reactive power compensator using voltage control, with wind farm grid-connected voltage target in order to control, and
Electric voltage exception can be disturbed and realize quick response；And need to use idle control in wind power plant normal operation, it realizes and electricity
Net reactive power exchange is minimum, to reduce operating cost.But in existing reactive power compensator control strategy, voltage control and
Occasionally there are conflicts for idle control, can not take into account.Traditional control strategy can first adjust voltage when voltage is unsatisfactory for requiring,
Voltage meet the requirements after can the reactive command that be issued according to automatic voltage control system idle be adjusted to what wind power plant exported.
However, sometimes such adjust may be since voltage and idle accommodation property be inconsistent and lead to voltage, idle
It adjusts repeatedly, causes the frequent movement of reactive-load compensation equipment.Or wind power plant can be caused when meeting voltage request, it is produced with power grid
Raw extra reactive power exchange, increases unnecessary operating cost.
Invention content
(1) technical problems to be solved
The present invention is in view of the above-mentioned problems, have studied a kind of more detailed, practical reactive-load compensation dress suitable for wind power plant
Set control strategy.The present invention considers the real-time working condition of the gentle static synchronous compensating device of Real-time Water of system voltage in detail, and
In conjunction with windfarm system to the particular/special requirement of reactive-load compensation, it is proposed that a kind of static synchronous compensating device electricity suitable for wind power plant
Press idle control strategy.On the basis of existing control strategy, the target voltage selection strategy table for different operating modes is provided, is carried
Passive filter branch and static synchronous compensating device voltage and reactive power coordinated control method are gone out.
Static synchronous compensating device is installed in wind farm low voltage bus bar side, monitors grid entry point system voltage U in real timeSWith it is idle
QS, and according to different USAnd QSLevel compares control targe selection strategy table, according to different compensation targets, the real-time work(of analysis system
Rate situation and reactive requirement, so that it is determined that the adjustable strategies of passive filter branch and static synchronous compensating device.Shown in Fig. 3,
The adjustable strategies of the passive filter branch and static synchronous compensating device can divide following 3 kinds of situations to confirm voltage control mesh
Mark：Work as UP<USWhen, it is abnormal to judge that system voltage occurs, at this time to control voltage as main target, analysis passive filter branch,
The adjustable inductive reactive power capacity of static synchronous compensating device is with compensation to the reactive capability needed for target voltage to determine pressure regulation
Degree size；Work as US<UDWhen, it is abnormal to judge that system voltage occurs, at this time to control voltage as main target, analyzes passive filtering
Device branch, the adjustable capacitive reactive power capacity of static synchronous compensating device and compensation are to the reactive capability needed for target voltage with true
Pressure of setting the tone degree size；Work as UD≤US≤UPWhen, judge that system voltage is normal, carries out voltage and reactive power coordinated control at this time, preferentially examine
Considering adjustment static synchronous compensating device output makes voltage, idle phase coordinate.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of static synchronous compensating device electricity suitable for wind power plant
Powerless control method, the method is pressed to be divided into following steps：
Static synchronous compensating device is installed in wind farm low voltage bus bar side, monitors grid entry point system voltage U in real timeSWith it is idle
QS；
According to different USAnd QSLevel compares control targe selection strategy table, and according to different compensation targets, analysis system is real
When power condition and reactive requirement, so that it is determined that the adjustable strategies of passive filter branch and static synchronous compensating device；
3 kinds of situations of adjustable strategies point of the passive filter branch and static synchronous compensating device or less confirm voltage control
Target processed：
Work as UP<USWhen：It is abnormal to judge that system voltage occurs, at this time to control voltage as main target, analyzes passive filter
Branch, the adjustable inductive reactive power capacity of static synchronous compensating device and compensation are to the reactive capability needed for target voltage with determination
Pressure regulation degree size；
Work as US<UDWhen, it is abnormal to judge that system voltage occurs, at this time to control voltage as main target, analyzes passive filter
Branch, the adjustable capacitive reactive power capacity of static synchronous compensating device and compensation are to the reactive capability needed for target voltage with determination
Pressure regulation degree size；
Work as UD≤US≤UPWhen, judge that system voltage is normal, carry out voltage and reactive power coordinated control at this time, pays the utmost attention to adjust
Static synchronous compensating device output makes voltage, idle phase coordinate.
Preferably, work as UP<USWhen concrete operation step it is as follows：
Compare and voltage is transferred to target voltage UTRequired inductive reactive power capacity △ QLWith the remaining perception of static synchronous compensating device
Reactive capability QS1Size；
If △ QLLess than QS1, then inductive reactive power additional issue △ QL, adjustment process terminates；
If △ QLMore than QS1, then excision passive filter branch is paid the utmost attention to；
If it is Q that capacitor group, which is not put into,C0=0, then inductive reactive power hair is maximum, and adjustment process terminates；
If capacitor group has the i.e. Q of inputC0>0, calculate voltage after one group of passive filter branch of excision；
If cutting off voltage after one group of passive filter branch is higher than target voltage, continue to calculate judgement after excision, until
Voltage is in target area；
If cutting off voltage after one group of passive filter branch is less than target voltage, passive filter branch is not cut off, and is felt
Property idle hair it is maximum, adjustment process terminates.
Preferably, work as US<UDWhen concrete operation step it is as follows：
Compare and voltage is transferred to target voltage UTRequired capacitive reactive power capacity △ QCWith put into inductive reactive power capacity QS0Greatly
It is small；
If △ QCLess than QS0, then inductive reactive power, which subtracts, sends out △ QC, adjustment process terminates；
If △ QCMore than QS0, then input passive filter branch is paid the utmost attention to；
First judge the situation that puts into operation of passive filter branch：
If passive filter branch has spare capacity i.e. QC1>0, then calculate the electricity after one group of passive filter branch of input
Press rising condition；
If putting into voltage after one group of passive filter branch is less than target voltage, continues above-mentioned calculating and put into
Journey, until voltage is in target voltage region；
If all input is Q to passive filter branchC1After=0, voltage is still below target voltage, and Static Synchronous is made to compensate
Device issues additional capacitive reactive power；
If static synchronous compensating device is sent to maximum capacity, voltage is still below target voltage, then adjusts process and terminate.
Preferably, work as UD≤US≤UPWhen concrete operation step it is as follows：
It is adjusted to UD≤US≤UPVoltage and reactive power coordinated control is carried out while voltage range, by being controlled to k value sizes
System carrys out the size that indirect adjustments and controls wind power plant is exchanged with electric network reactive-load, and reactive power exchange capacity is smaller, and power factor is higher.
Preferably, the control targe selection strategy table selection information is as follows：
Work as QS>0 and UP<USWhen, UT=UEXP；
Work as QS>0 and UD≤US≤UPWhen, UT=US-k(US-UD)；
Work as QS>0 and US<UDWhen, UT=UD；
Work as QS=0 and UP<USWhen, UT=UP；
Work as QS=0 and UD≤US≤UPWhen, UT=US；
Work as QS=0 and US<UDWhen, UT=UD；
Work as QS<0 and UP<USWhen, UT=UP；
Work as QS<0 and UD≤US≤UPWhen, UT=US+k(UP-US)；
Work as QS<0 and US<UDWhen, UT=UEXD。
(3) advantageous effect
The present invention has taken into account rational Reactive-power control demand while ensureing at voltage in qualified range.This hair
It is bright on the basis of realizing the control method, realize wind power plant while meeting voltage control targe, accomplish with power grid without
Work(exchanges cost that is minimum, and then effectively reducing wind power plant operation.Control strategy according to the invention carries out reactive voltage tune
It is whole, when the upper limit as defined in the standard of closing on or lower limit, the switching of capacitor branches is paid the utmost attention to, quickly to carry out voltage adjusting.
When deviation interval of acceptance is less, the adjusting of dynamic branch is paid the utmost attention to, it is relatively steady accurate to avoid causing reactive current to impact
It carries out voltage power-less and coordinates adjustment.Not only it ensure that wind-powered electricity generation field voltage was in qualified range, but also taken into account wind power plant and power grid
Reactive power exchange is minimum, effectively raises the operational efficiency of windfarm system.
Description of the drawings
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 technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is according to a kind of static synchronous compensating device voltage powerless control method one suitable for wind power plant of the invention
The wind power plant typical wiring figure of the dynamic reactive compensation device of embodiment；
Fig. 2 is according to a kind of static synchronous compensating device voltage powerless control method one suitable for wind power plant of the invention
The voltage control targe section block plan of embodiment；
Fig. 3 is according to a kind of static synchronous compensating device voltage powerless control method one suitable for wind power plant of the invention
The wind power plant voltage control strategy flow chart of embodiment；
Fig. 4 is according to a kind of static synchronous compensating device voltage powerless control method one suitable for wind power plant of the invention
Embodiment works as UP<USWhen control flow chart；
Fig. 5 is according to a kind of static synchronous compensating device voltage powerless control method one suitable for wind power plant of the invention
Embodiment works as US<UDWhen control flow chart；
Fig. 6 is according to a kind of static synchronous compensating device voltage powerless control method one suitable for wind power plant of the invention
Embodiment works as UD≤US≤UPWhen control flow chart.
Specific implementation mode
With reference to the accompanying drawings of the specification and embodiment, the specific implementation mode of the present invention is described in further detail.With
Lower embodiment is merely to illustrate the present invention, but cannot be used for limiting the scope of the invention.
The present invention is to solve above-mentioned technical problem by the following technical programs, below in conjunction with Figure of description to the present invention
It is described further：
As shown in Figure 1, static synchronous compensating device is installed in wind farm low voltage bus bar side, grid-connected dot system electricity is monitored in real time
Press USWith idle QS, and according to USAnd QSLevel compares static synchronous compensating device control targe selection strategy table, selectes static
Synchronous compensator plant controls voltage-target UT.Table 1 is static synchronous compensating device control targe selection strategy table：
Table 1
USFor the real-time sampling value of wind farm grid-connected dot system voltage；
QSThe real-time sampling value of power system reactive power is injected for wind power plant；
UEXP、UEXDFor windfarm system voltage limits rated value.Recommend selection UEXP=107%USystem voltage, UEXD=97%
USystem voltage；
UTVoltage-target is controlled for static synchronous compensating device, is voluntarily adjusted by program；
UPThe upper limit value that system voltage acceptability limit is judged for static synchronous compensating device carries out manual according to field working conditions
Selection U is recommended in settingP=106.5%USystem voltage；
UDThe lower limiting value that system voltage acceptability limit is judged for static synchronous compensating device carries out manual according to field working conditions
Selection UD=97.5%U system voltages are recommended in setting；
K carries out the step-length of voltage power-less coordination for static synchronous compensating device, and manual setting is carried out according to field working conditions,
Recommend selection k=1%.
According to the calculation formula of compensation to reactive power △ Q needed for target voltage, System Reactive Power demand is calculated, in conjunction with
Passive filter branch and static synchronous compensating device reactive power, which are contributed, determines reactive-load compensation range, provides corresponding coordination plan
Slightly.
△ Q=︱ US-UT︱ × (SD/USystem voltage)；Wherein：
△ Q are to compensate to reactive power needed for target voltage；
USystem voltageFor system nominal voltage；
SDFor the capacity of short circuit at wind power plant busbar.
Assuming that wind power plant is equipped with capacity QSTATCOM(unit：Mvar static synchronous compensating device and capacity) is QCIt is (single
Position：Mvar passive filter branch).Static synchronous compensating device has put into reactive capability QS0It indicates, remaining reactive capability
Use QS1It indicates, wherein capacitive reactive power is just, and inductive reactive power is negative.Passive filter branch has put into capacitive reactive power capacity QC0
It indicates, remaining capacitive reactive power capacity QC1It indicates, and passive filter branch puts into, is failure to actuate and cuts off and uses " 1 ", " 0 " respectively
" ﹣ 1 " is indicated.It compensates perception, capacitive reactive power needed for target voltage and uses △ Q respectivelyL, △ QCIt indicates.
△QL=△ QC=︱ US-UT︱ × (SD/USystem voltage)
As shown in figure 4, working as system voltage UP<USWhen, adjustable strategies are as follows：
Specifically：
First compare and voltage is transferred to target voltage UTRequired inductive reactive power capacity △ QLWith static synchronous compensating device residue
Inductive reactive power capacity QS1Size；
If △ QLLess than QS1, then inductive reactive power additional issue △ QL, adjustment process terminates；
If △ QLMore than QS1, then excision passive filter branch is paid the utmost attention to；
If capacitor group does not put into (QC0=0), then inductive reactive power hair is maximum, and voltage is accessible closest at this time
The value of target voltage, adjustment process terminate；
If capacitor group has the i.e. Q of inputC0>0, calculate voltage after one group of passive filter branch of excision；
If cutting off voltage after one group of passive filter branch is higher than target voltage, continue to calculate judgement after excision, until
Voltage is in target area；
If cutting off voltage after one group of passive filter branch is less than target voltage, passive filter branch is not cut off, and is felt
Property idle hair it is maximum, adjustment process terminates.
As shown in figure 5, working as system voltage US<UDWhen, adjustable strategies are as follows：
Specifically：
First compare and voltage is transferred to target voltage UTRequired capacitive reactive power capacity △ QCWith put into inductive reactive power capacity QS0
Size；
If △ QCLess than QS0, then inductive reactive power, which subtracts, sends out △ QC, adjustment process terminates；
If △ QCMore than QS0, then input passive filter branch is paid the utmost attention to, because Voltage Drop is more at this time, puts into nothing
Source filter branch can raise voltage by a relatively large margin；
First judge the situation that puts into operation of passive filter branch：
If passive filter branch has spare capacity (QC1>0) after, then calculating one group of passive filter branch of input
Voltage rising condition；
If putting into voltage after one group of passive filter branch is less than target voltage, continues above-mentioned calculating and put into
Journey, until voltage is in target voltage region；
If passive filter branch is all after input (QC1=0), voltage is still below target voltage, and Static Synchronous is made to mend
Repay device additional issue capacitive reactive power；
If static synchronous compensating device is sent to maximum capacity, voltage is still below target voltage, then adjusts process and terminate.
As shown in fig. 6, as system voltage UD≤US≤UP, by taking UT≤US≤parts UP as an example, adjustable strategies are as follows：
Specifically：
It is adjusted to UD≤US≤UPWhen voltage range, it to be also carried out at the same time voltage and reactive power coordinated control, by k value sizes
It is controlled and carrys out the size that indirect adjustments and controls wind power plant is exchanged with electric network reactive-load, this reactive power exchange capacity is smaller, and power factor is got over
It is high.
Embodiment of above is merely to illustrate the present invention rather than limitation of the present invention.Although with reference to embodiment to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that, to technical scheme of the present invention carry out it is various combination,
Modification or equivalent replacement, without departure from the spirit and scope of technical solution of the present invention, the right that should all cover in the present invention is wanted
It asks in range.
Claims (5)
1. a kind of static synchronous compensating device voltage powerless control method suitable for wind power plant, the method is divided into following step
Suddenly：
Passive filter branch and static synchronous compensating device dress are set to wind farm low voltage bus bar side, monitor grid entry point system in real time
Unite voltage USWith idle QS；
According to USAnd QSLevel compares static synchronous compensating device control targe selection strategy table, selectes static synchronous compensating device
Control targe voltage value UT, so that it is determined that the adjustable strategies of passive filter branch and static synchronous compensating device；
3 kinds of situations of adjustable strategies point of the passive filter branch and static synchronous compensating device or less confirm that voltage controls mesh
Mark：
Work as UP<USWhen：It is abnormal to judge that system voltage occurs, at this time to control voltage as main target, analyzes passive filter branch
Road, the adjustable inductive reactive power capacity of static synchronous compensating device and compensation are adjusted to the reactive capability needed for target voltage with determining
Pressure degree size；
Work as US<UDWhen, it is abnormal to judge that system voltage occurs, at this time to control voltage as main target, analyzes passive filter branch
Road, the adjustable capacitive reactive power capacity of static synchronous compensating device and compensation are adjusted to the reactive capability needed for target voltage with determining
Pressure degree size；
Work as UD≤US≤UPWhen, judge that system voltage is normal, carry out voltage and reactive power coordinated control at this time, pays the utmost attention to adjust static
Synchronous compensator plant output makes voltage, idle phase coordinate；
Wherein, UPFor the upper limit value of system voltage acceptability limit, UDFor the lower limiting value of system voltage acceptability limit.
2. a kind of static synchronous compensating device voltage powerless control method suitable for wind power plant according to claim 1,
It is characterized in that, working as UP<USWhen concrete operation step it is as follows：
Compare and voltage is transferred to target voltage UTRequired inductive reactive power capacity △ QLWith static synchronous compensating device residue inductive reactive power
Capacity QS1Size；
If △ QLLess than QS1, then inductive reactive power additional issue △ QL, adjustment process terminates；
If △ QLMore than QS1, then excision passive filter branch is paid the utmost attention to；
If it is Q that capacitor group, which is not put into,C0=0, then inductive reactive power hair is maximum, and adjustment process terminates；
If capacitor group has the i.e. Q of inputC0>0, calculate voltage after one group of passive filter branch of excision；
If cutting off voltage after one group of passive filter branch is higher than target voltage, continue to calculate judgement after excision, until voltage
In target area；
If cutting off voltage after one group of passive filter branch is less than target voltage, passive filter branch is not cut off, perceptual nothing
Work(hair is maximum, and adjustment process terminates.
3. a kind of static synchronous compensating device voltage powerless control method suitable for wind power plant according to claim 2,
It is characterized in that, working as US<UDWhen concrete operation step it is as follows：
Compare and voltage is transferred to target voltage UTRequired capacitive reactive power capacity △ QCWith put into inductive reactive power capacity QS0Size；
If △ QCLess than QS0, then inductive reactive power, which subtracts, sends out △ QC, adjustment process terminates；
If △ QCMore than QS0, then input passive filter branch is paid the utmost attention to；
First judge the situation that puts into operation of passive filter branch：
If passive filter branch has spare capacity i.e. QC1>0, then calculate the voltage liter after one group of passive filter branch of input
High situation；
If putting into voltage after one group of passive filter branch is less than target voltage, continue above-mentioned calculating and input process, directly
It is in target voltage region to voltage；
If all input is Q to passive filter branchC1After=0, voltage is still below target voltage, makes static synchronous compensating device
Issue additional capacitive reactive power；
If static synchronous compensating device is sent to maximum capacity, voltage is still below target voltage, then adjusts process and terminate.
4. a kind of static synchronous compensating device voltage powerless control method suitable for wind power plant according to claim 3,
It is characterized in that, working as UD≤US≤UPWhen concrete operation step it is as follows：
It is adjusted to UD≤US≤UPVoltage and reactive power coordinated control is carried out while voltage range, by k value sizes controlled come
The size that indirect adjustments and controls wind power plant is exchanged with electric network reactive-load, reactive power exchange capacity is smaller, and power factor is higher.
5. according to a kind of static synchronous compensating device voltage suitable for wind power plant of Claims 1 to 4 item any one of them without
Work(control method, which is characterized in that the control targe selection strategy table selection information is as follows：
Work as QS>0 and UP<USWhen, UT=UEXP；Wherein UTFor target voltage values, UEXPFor windfarm system upper voltage limit value rated value；
Work as QS>0 and UD≤US≤UPWhen, UT=US-k(US-UD)；Wherein, k is that static synchronous compensating device carries out voltage power-less association
The step-length of tune；
Work as QS>0 and US<UDWhen, UT=UD；
Work as QS=0 and UP<USWhen, UT=UP；
Work as QS=0 and UD≤US≤UPWhen, UT=US；
Work as QS=0 and US<UDWhen, UT=UD；
Work as QS<0 and UP<USWhen, UT=UP；
Work as QS<0 and UD≤US≤UPWhen, UT=US+k(UP-US)；
Work as QS<0 and US<UDWhen, UT=UEXD；Wherein, UEXDFor windfarm system voltage lower limit value rated value.
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| CN112769144A (en) * | 2020-12-30 | 2021-05-07 | 西安西驰电气股份有限公司 | SVG and capacitor-based power grid hybrid compensation device and method |
| CN116247751A (en) * | 2022-12-09 | 2023-06-09 | 华为数字能源技术有限公司 | Network construction control method of power converter and power converter |
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| CN102231525B (en) * | 2011-06-28 | 2013-07-31 | 思源清能电气电子有限公司 | Voltage quality control (VQC) system based on static var generator(SVG) and method thereof |
| US20130293021A1 (en) * | 2012-05-01 | 2013-11-07 | Rajiv Kumar Varma | Enhanced utilization of real power generating capacity of distributed generator (dg) inverters as statcom |
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