CN105262098B - The quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output - Google Patents
The quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output Download PDFInfo
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Abstract
The present invention relates to the quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output, belong to power system automatism voltage control technical field.This method includes：Carry out interim, to collect to an each wind-powered electricity generation Two-stage control subregion data acquisition of progress at each data acquisition moment T；Calculate the active power fluctuation rate of each wind field i in each Two-stage control subregion and judge whether out-of-limit；When the active power fluctuation rate that wind power plant is there are in subregion is more prescribed a time limit, then starting once quick voltage to the subregion controls；If there do not have any wind power plant active power fluctuation rate occur in subregion to be out-of-limit, reach normal cycle control, then start a normal voltage control.This method is by starting once quick automatism voltage control, the reactive voltage of each wind field in quick regulation wind-powered electricity generation region, so as to suppress the influence that wind power swing is brought to power network；It is controlled using based on normal controlling cycle, keeps the voltage stabilization in wind-powered electricity generation region and take into account the idle torque equilibrium of wind power plant.
Description
Technical field
It is more particularly to a kind of to be based on wind power plant generated output the invention belongs to power system automatism voltage control technical field
Fluctuate the quick automatic voltage control method assessed.
Background technology
Due to the shortage of coal resources, countries in the world put into substantial amounts of human and material resources and explore new using energy source mould one after another
Formula, wind energy turn into one of universally acknowledged green energy resource with tremendous expansion potentiality.
The mode of the power network of blower fan access at present has two kinds, and one kind is by establishing wind power plant, and field inner blower passes through transformer station
Extensive concentrate is incorporated to middle-voltage network, and another is to use distributed mode, each blower fan is accessed into secondary network, directly
Powered to terminal user.Wherein first way can produce concentration, Large Copacity generated output, obtain in the world
Large-scale application, it is Denmark to compare successful story, till now, wind-power electricity generation proportion alreadys exceed 20%,
It is expected that in the year two thousand twenty, wind-power electricity generation can account for 50% and more than, the second way has preferable development in intelligent distribution network
Prospect.In China, wind-power electricity generation mainly to concentrate grid-connected pattern on a large scale, although wind-power electricity generation has many advantages, but still
Have in the presence of some technical problems to be solved.Wherein than it is more prominent be exactly many wind power plants because of voltage problem chain off-grid,
Automatism voltage control (AVC, Automatic Voltage Control) system, it is considered to be solve the problems, such as wind-powered electricity generation region voltage
An effective ways.
The power network automatism voltage control of main flow mainly has Three models both at home and abroad at present：
The first is the Two-stage control pattern using German RWE Utilities Electric Co.s as representative, is carried out in grid dispatching center optimal
The optimization of trend (OPF) calculates, and result of calculation is directly sent to each power plant, transformer station is controlled.In dispatching control center,
OPF is based on state estimation, and real time execution is directly realized by consideration operation constraint using loss minimization as mesh in EMS highest level
Target overall situation Reactive power control.Although this pattern control is simple, OPF is completely dependent on, AVC operational reliability is difficult to protect
Card.OPF is main to consider the constraint of voltage bound and loss minimization as static optimization computing function.If it is completely dependent on
OPF, then AVC be difficult to coordinate voltage stability, be completely dependent on OPF, voltage stability can not be ensured.OPF models calculate
Amount is big, and it is longer to calculate the time.When big disturbance occurs in system, load skyrockets or drops suddenly when, if being completely dependent on OPF, AVC
Response speed it is inadequate, the dynamic quality of control is difficult to ensure that.
Second is that it is studied and implementation starts from the tertiary voltage control pattern that Electricite De France (EDF) is representative
The seventies in last century, research, the development and application in more than 30 years are experienced, be to be known as state-of-the-art voltage control in the world at present
System processed.On international conference on large HV electric systems in 1972, the engineer from EDF proposes realizes harmony electricity in system scope
The necessity of voltage-controlled system, describe voltage control schemes of the French EDF based on " maincenter bus ", " control area " in detail
Structure, power network are divided into the control area of some decouplings, and whole control system is divided into three levels：Voltage order one controls
(PVC, Primary Voltage Control), secondary voltage control (SVC, Secondary Voltage Control) and three
Step voltage controls (TVC, Tertiary Voltage Control).The control model has obtained good application, but the mould
Formula still suffers from shortcoming because the secondary voltage control (SVC) in region be the locality based on power system reactive power voltage and
Exploitation, and interregional reactive voltage has coupling, therefore the quality of control system is fundamentally depending on each interregional nothing
The voltage-controlled degree of coupling of work(.But think phase with the development of power system and the real-time change of operating condition, during design
It is not unalterable to the region of decoupling, and it is even more with operating condition that sensitivity is controlled existing in the form of fixing control parameter
And real-time change, therefore this zone controller being fixed up in the form of hardware be difficult in adapt to power system continuous development and
Real time execution operating mode is widely varied, and therefore, it is difficult to enduringly ensure to have good control effect.
The third is the tertiary voltage control based on " soft sectoring " that Tsing-Hua University's department of electrical engineering dispatching automation laboratory proposes
Molding formula, the pattern are used widely in big regional power grid, provincial power network at home.In this mode, control centre
AVC application software be made up of three class control module, Two-stage control module.Three class control is the optimal load flow of global idle work optimization
(OPF) the voltage optimization control targe of the whole network coordination, is provided；Two-stage control is that the control strategy of subregion decoupling calculates, with three-level
The optimal control target for controlling the maincenter bus in each subregion provided is input, considers that the Reactive-power control such as power plant is set in subregion
It is standby, the control strategy of various idle resources in subregion is calculated, and be issued to power plant and transformer station；The sub-station device at plant stand end is completed
One-level controls, and receives the control strategy that scheduling station issues and execution.The control model and French EDF tertiary voltage control
Difference is to be controlled the automatic division in region to power network online by the software in control centre, i.e., using " soft sectoring "
Thought, when electric network composition and the method for operation change, the AVC main websites of control centre can adapt to automatically, so as to meet electricity
The requirement of net development and change.
In the tertiary voltage control pattern based on " soft sectoring ", the secondary voltage control (SVC) of each subregion is to hold
Key link under opening.Guo Qing comes, Sun Hongbin, Zhang Baiming exist《The research of coordinated secondary voltage control》(Automation of Electric Systems,
In December, 2005, V29N23, pp.19-24) in propose a kind of coordinated secondary voltage control (CSVC) model towards subregion,
And routine hydroelectric power plant, thermal power plant automatism voltage control in be used widely.The model is paying the utmost attention to maincenter
On the premise of busbar voltage deviation minimum, ensure one's respective area generator operation in Reactive Power Margin more using unnecessary control freedom degree
Greatly, the more balanced state of output.The specific physical meaning of each variable involved by the model can intuitively be found out from figure.
Wherein, QgRepresent control generator currently idle output, VgRepresent control generator generator terminal bus current voltage, VpExpression maincenter
Bus current voltage, VHRepresent the current voltage of generator high-voltage side bus.CgAnd CvgIt is full for reactive voltage sensitivity matrix
Foot：
ΔVp=CgΔQg (1.1)
ΔVH=CvgΔQg (1.2)
ΔQgFor the Reactive-power control amount of generator, Δ VHFor the voltage adjustment amount of high-pressure power plant side bus.Maincenter in subregion
Bus is generally advance artificial selection and specified.The model employs quadratic programming model to calculate the control instruction of power plant.It is secondary
The object function of planning form is as follows：
Wherein, the Reactive-power control amount Δ Q of generator is selectedgFor the optimized variable of quadratic programming；WithRepresent respectively
Idle lower limit and the idle upper limit；Represent the setting voltage in subregion；WpAnd WqFor weight coefficient, α is gain coefficient；Formula (3)
Object function Part I embody adjustment generator reactive so that maincenter bus reaches the desired value that three class control provides.Together
When, in order to realize increase generator reactive nargin and be allowed to more balanced purpose of contributing, draw in the Part II of object function
Reactive Power Margin vector theta is enteredg, its i-th of component is
Will | | Θg||2(Reactive Power Margin vector thetag) be incorporated into quadratic programming object function, it is ensured that on the one hand increase
The Reactive Power Margin of generator is controlled, on the other hand promotes each control generator to develop to idle more balanced direction of contributing.
The minimization problem for adjusting AVC secondary voltage control module to solve formula (3) in the case where meeting security constraints is saved, this
A little constraints include：
Wherein Vp、WithMaincenter bus current voltage, maincenter busbar voltage lower limit and maincenter bus electricity are represented respectively
Press the upper limit；Qg、WithCurrent idle, the idle lower limit of control generator and the idle upper limit are represented respectively；VH、
WithRepresent that current voltage, lower voltage limit, upper voltage limit and the single step of permission of generator high-voltage side bus are maximum respectively
Adjustment amount.
The above is related to reactive voltage sensitivity matrix CgAnd Cvg(wherein CgIt is power plant's Reactive-power control amount in region
Pivot busbar voltage VpSensitivity matrix, CvgIt is each power plant's Reactive-power control amount to generator high side bus voltage VHSensitivity
Matrix) calculating.Sun Hongbin, Zhang Baiming, Xiang Niande exist《Quasi-stationary Sensitivity Analysis Method》(Proceedings of the CSEE,
In April, 1999 V19N4, pp.9-13) in propose new sensitivity method, with routine static Sensitivity Analysis Method
Difference, new sensitivity method consider the quasi-stationary physical responses of power system, new and old stable state before and after meter and system control
Between total change, effectively increase the precision of sensitivity analysis.PQ Decoupled Model of this method based on power system, works as generator
When automatic voltage regulator (AVR) is installed, it is believed that the generator node is that (active-power P and voltage magnitude V are given to PV
) node；And when generator is equipped with automatic reactive power regulation (AQR) or automatic power factor regulation (APFR), it is believed that
It is PQ (active-power P and reactive power Q be given) node that the generator node is identical with common load bus.In addition,
By static load characteristics consider into node voltage once or conic section.The tide model so established just naturally will
These quasi-stationary physical responses take in, so as to be quasi-stationary sensitive based on the sensitivity that tide model calculates
Degree.Save and adjust in AVC, CgAnd CvgUse quasi-stationary sensitivity.
At present for the power network AVC control systems of the field areas containing wind-powered electricity generation, more using the above-mentioned tertiary voltage based on soft sectoring
Control model, the automatism voltage control of wind-powered electricity generation collection region are in the aspect of Two-stage control.Generally to wind-powered electricity generation pooling zone
Secondary voltage control subregion is established in domain, using the high-voltage side bus of each wind power plant as control bus, collects station mother with wind-powered electricity generation region
Line is maincenter bus, the voltage control strategy of each wind power plant in each subregion of computation of Period.Automatic voltage in control centre
In control system, when carrying out automatism voltage control to traditional thermal power plant, hydroelectric power plant, enter according to controlling cycle set in advance
The calculating of row control strategy and issuing for control instruction.It is domestic at present to use 5 minutes as controlling cycle more.Due to large-scale wind power
In power network end weak link, voltage pulsation of the wind power swing on wind-electricity integration region bus influences notable for access.Have compared with
The region of more wind-electricity integrations, due to the rapid fluctuations of its active power output, may be caused in 5 minutes wind field high-voltage side bus and
The fluctuation of wind-powered electricity generation pooling zone maincenter bus, it is necessary to correct the maincenter busbar voltage control of wind power plant bus and collection region in time
Target processed, to meet the requirement of wind-powered electricity generation collection region Voltage Stability Control.
In summary, the automatic voltage mode of traditional fixation controlling cycle is used in wind field collection region, can not be adapted to
The situation of wind-powered electricity generation collection region voltage rapid fluctuations, can not meet the control requirement of wind-electricity integration area voltage stability.From mesh
From the point of view of preceding published document, also have no better method and can solve the problem that the problem.
The content of the invention
It is an object of the invention to overcome the weak point of prior art, there is provided one kind is based on wind power plant generated output ripple
The dynamic quick automatic voltage control method assessed, this method pass through the ripple to each wind power plant Active Generation power in wind-electricity integration region
It is dynamic to be assessed, when active power fluctuation amount exceedes to set threshold, start once quick automatism voltage control, quick regulation wind
The reactive voltage of the electric each wind field in region, so as to suppress the influence that wind power swing is brought to power network；When there is each wind field in region
When work(power swing is smaller, it is controlled using based on normal controlling cycle, keeps the voltage stabilization in wind-powered electricity generation region and take into account
The idle torque equilibrium of wind power plant.Technical scheme is as follows to achieve the above object：
A kind of quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output proposed by the present invention, it is special
Sign is：In grid dispatching center automatic voltage control system, the AVC Two-stage controls that a wind-powered electricity generation collection region is established are divided
Area k Controlling model is with set ZkRepresent：Zk={ VP,VH,Pg,Qg, wherein VPRepresent that each wind power plant in the subregion is collected
Maincenter busbar voltage, VHRepresent each wind power plant high-pressure side control bus voltage, P in the subregiongRepresent the total active of each wind power plant
Contribute, QgRepresent each wind power plant always idle output.This method preliminary setting data collection period T1 and data acquisition moment T, with
And normal controlling cycle T2, carry out carrying out a data acquisition using T1 as the cycle, to generate once just per normal controlling cycle T2
Normal control instruction；
This method comprises the following steps：
1) interim, the Two-stage control subregion Z collected to each wind-powered electricity generation is carried out at each data acquisition moment TkCarry out a number
According to collection；The data of collection include：Each wind power plant always generates electricity active-power P in the secondary partitiong, reactive power Qg, wind power plant it is high
Press side bus voltage VH, wind-powered electricity generation collection region maincenter busbar voltage VPInstantaneous value；
2) each Two-stage control subregion Z is calculatedkIn each wind field i active power fluctuation rate and judge whether out-of-limit；Tool
Body comprises the following steps：
2-1) calculate each wind field i active power fluctuation rate：
Wherein：For current T moment, total active power output of the wind field；For last moment wind field it is total it is active go out
Power；
For total installed capacity of wind-driven power of the wind field；
2-2) the R to obtainingk,i, determine whether to meet Rk,i＞ R0, wherein R0For the active power of wind power field stability bandwidth of setting
Critical parameter；If it is satisfied, explanation subregion ZkIn have that the active power fluctuation rate of wind power plant is out-of-limit, then perform step 3), otherwise
Return to step 2-1) next wind power plant in subregion is continued with, completed until all wind power plants in subregion are handled；
If 2-3) subregion ZkIn whole wind power plants checked and any wind power plant is unsatisfactory for Rk,i＞ R0, then hold
Row step 4)；
3) as subregion ZkIn there are the active power fluctuation rate of wind power plant and more prescribe a time limit, then the subregion is started once quick
Voltage controls；Specifically include following steps：
The coordination secondary voltage sensitivity Controlling model being made up of object function constraints for 3-1) constructing the subregion is as follows：
Object function：
Constraints：
Wherein CgFor each wind power plant Reactive-power control amount Δ QgTo region maincenter busbar voltage VpSensitivity matrix, CvgTo be each
Wind power plant Reactive-power control amount Δ QgTo wind field high-pressure side control bus voltage VHSensitivity matrix；
Constraints C0Represent the constraint for meeting wind power plant high side bus voltage regulation step-length；C1Expression meets wind field height
Press the constraint of side bus voltage safe operation limit value；C2Expression meets wind-powered electricity generation collection region maincenter busbar voltage limit value safe for operation
Constraint；C3The constraint for meeting the total idle output of each wind power plant is represented, whereinWithFor each wind power plant automatism voltage control
The total idle output lower limit and higher limit sent on substation is real-time；
3-2) utilize 3-1) construction model calculated, obtain total Reactive-power control amount Δ Q of each wind fieldg, further according to formula
(4) high side bus voltage setting value of each wind field in the wheel agility automatism voltage control is calculated
For bus current voltage value；
Each wind field high-voltage side bus setting value in the region being calculated 3-3) is issued to the area as control instruction
Each wind field automatism voltage control substation in domain starts quick voltage control, goes to step 5)；
If 4) subregion ZkIn not have any wind power plant active power fluctuation rate occur out-of-limit, then check whether current time reaches
T2, such as not up to T2 are controlled to normal cycle, then performs step 5)；If reaching T2, start a normal voltage control, tool
Body comprises the following steps：
The normal Controlling model of coordination secondary voltage being made up of object function constraints for 4-1) constructing the subregion is as follows：
Object function：
Constraints：
Wherein ΘgFor the harmonious index of the idle output in wind field field in subregion；
4-2) utilizing 4-1) normal Controlling model calculated, obtain total Reactive-power control amount Δ Q of each wind fieldg, further according to
High side bus voltage setting value of each wind field in the normal automatism voltage control of the wheel is calculated in formula (7)：
Each wind field high-voltage side bus setting value in the region being calculated 4-3) is issued to each wind field as control instruction
Automatism voltage control substation starts normal voltage control；Go to step 5)；
Epicycle control terminates, and waits the moment of data acquisition next time to arrive, goes to step 1).
The features of the present invention and effect：
The present invention proposes a kind of quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output.The party
Method is assessed by the fluctuation to each wind power plant Active Generation power in wind-electricity integration region, is given when active power fluctuation amount exceedes
During set threshold, start once quick automatism voltage control, the reactive voltage of each wind field in quick regulation wind-powered electricity generation region, suppress wind power
Fluctuate the influence brought to line voltage；When the active power fluctuation of each wind field in region is smaller, using based on normal control
Cycle processed is controlled, and keeps the voltage stabilization in wind-powered electricity generation region and takes into account the idle torque equilibrium of wind power plant.
Brief description of the drawings
Fig. 1 coordinated secondary voltage control model schematics.
Fig. 2 is the quick automatism voltage control flow chart that the present invention is assessed based on the fluctuation of wind power plant generated output.
Fig. 3 is the wind power plant schematic diagram of the embodiment of the present invention.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment, herein illustrative examples of the invention
And explanation is used for explaining the present invention, but it is not as a limitation of the invention.
A kind of quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output proposed by the present invention, it is special
Sign is, in grid dispatching center automatic voltage control system, the AVC Two-stage controls that a wind-powered electricity generation collection region is established are divided
Area k Controlling model is with set ZkRepresent：Zk={ VP,VH,Pg,Qg, wherein VPRepresent that each wind power plant in the subregion is collected
Maincenter busbar voltage, VHRepresent each wind power plant high-pressure side control bus voltage, P in the subregiongRepresent the total active of each wind power plant
Contribute, QgRepresent each wind power plant always idle output；Preliminary setting data collection period T1 and data acquisition moment T, and normally
(data collection cycle T1 is automatic voltage control system gathered data cycle, generally 30 seconds to controlling cycle T2, and normal control is all
Phase T2 is the cycle of automatic control system generation instruction, and generally 5 minutes, data acquisition moment T was the time of gathered data, one
As be a collection period T1 at the beginning of carve, using T1 be the cycle carry out data acquisition (i.e. every 30 seconds progress data adopt
Collection), (every 5 minutes) one subnormal control instructions of generation of each normal controlling cycle；
This method comprises the following steps：
1) interim, the Two-stage control subregion Z collected to each wind-powered electricity generation is carried out at each data acquisition moment TkCarry out a number
According to collection；The data of collection include：Each wind power plant always generates electricity active-power P in the secondary partitiong, reactive power Qg, wind power plant it is high
Press side bus voltage VH, wind-powered electricity generation collection region maincenter busbar voltage VPInstantaneous value；
2) each Two-stage control subregion Z is calculatedkIn each wind field i active power fluctuation rate and judge whether out-of-limit；Tool
Body comprises the following steps：
2-1) calculate each wind field i active power fluctuation rate：
Wherein：For current T moment, total active power output of the wind field；For total active power output of last moment wind field；For total installed capacity of wind-driven power of the wind field；
2-2) the R to obtainingk,i, determine whether to meet Rk,i＞ R0, wherein R0For the active power of wind power field stability bandwidth of setting
Critical parameter (R0General value 0.3)；If it is satisfied, explanation subregion ZkIn have the active power fluctuation rate of wind power plant out-of-limit, then hold
Row step 3), otherwise return to step 2-1) next wind power plant in subregion is continued with, at all wind power plants in subregion
Reason is completed；
If 2-3) subregion ZkIn whole wind power plants checked and any wind power plant is unsatisfactory for Rk,i＞ R0, then hold
Row step 4)；
3) as subregion ZkIn there are the active power fluctuation rate of wind power plant and more prescribe a time limit, then the subregion is started once quick
Voltage controls；Specifically include following steps：
The coordination secondary voltage sensitivity Controlling model being made up of object function constraints for 3-1) constructing the subregion is as follows：
Object function：
Constraints：
Wherein CgFor each wind power plant Reactive-power control amount Δ QgTo region maincenter busbar voltage VpSensitivity matrix, CvgTo be each
Wind power plant Reactive-power control amount Δ QgTo wind field high-pressure side control bus voltage VHSensitivity matrix；
(meaning of the model objective function is by maximally effective wind power plant Reactive-power control amount Δ Qg, by wind-powered electricity generation pooling zone
The maincenter busbar voltage V in domainpAdjust control targeNear, so as to keep the stabilization of wind-powered electricity generation collection region voltage.)
Constraints C0Represent the constraint for meeting wind power plant high side bus voltage regulation step-length；C1Expression meets wind field height
Press the constraint of side bus voltage safe operation limit value；C2Expression meets wind-powered electricity generation collection region maincenter busbar voltage limit value safe for operation
Constraint；C3The constraint for meeting the total idle output of each wind power plant is represented, whereinWithFor each wind power plant automatism voltage control
The total idle output lower limit and higher limit sent on substation is real-time (with wind power plant inner blower and other reactive apparatus transport by the limit value
The change of row state and change, blower fan and other reactive apparatus put into operation more, and total idle output upper limit value and lower limit value is wider), be
The limit value constraint of a kind of real-time update)；
(the harmonious index of the idle output of wind power plant is not considered in the quick Controlling model, is only accounted for using most effective
Means quick regulation voltage, can each wind field in quick regulation wind-powered electricity generation region reactive voltage, suppress wind power swing to power network electricity
The influence that pressure zone comes；)
3-2) utilize 3-1) construction model calculated, obtain total Reactive-power control amount Δ Q of each wind fieldg, further according to formula
(4) high side bus voltage setting value of each wind field in the wheel agility automatism voltage control is calculated
For bus current voltage value；
Each wind field high-voltage side bus setting value in the region being calculated 3-3) is issued to the area as control instruction
Each wind field automatism voltage control substation in domain starts quick voltage control, goes to step 5)；
If 4) subregion ZkIn not have any wind power plant active power fluctuation rate occur out-of-limit, then check whether current time reaches
T2, such as not up to T2 are controlled to normal cycle, then performs step 5)；If reaching T2, start a normal voltage control, tool
Body comprises the following steps：
The normal Controlling model of coordination secondary voltage being made up of object function constraints for 4-1) constructing the subregion is as follows：
Object function：
Constraints：
Wherein ΘgFor the harmonious index of the idle output in wind field field in subregion；
(quick Controlling model is compared, the object function adds the idle output of Part II each wind power plant i.e. in region
Tend to balanced target, the voltage stabilization in wind-powered electricity generation region can be kept and take into account the idle torque equilibrium of wind power plant.The mould is normal
Each constraints of control type is identical with step 3).)
4-2) utilizing 4-1) normal Controlling model calculated, obtain total Reactive-power control amount Δ Q of each wind fieldg, further according to
High side bus voltage setting value of each wind field in the normal automatism voltage control of the wheel is calculated in formula (7)：
Each wind field high-voltage side bus setting value in the region being calculated 4-3) is issued to each wind field as control instruction
Automatism voltage control substation starts normal voltage control；Go to step 5)；
5) epicycle control terminates, and waits the moment of data acquisition next time to arrive, goes to step 1).
Embodiment
The present embodiment is to a Two-stage control subregion (Zk) automatism voltage control is carried out, include 2 110kV in the subregion
Wind power plant is respectively P1, P2, and 1 110kV collects station S1, and wherein P1 wind energy turbine set installed capacities be 250MW, and P2 wind power plants fill
Machine capacity is 300MW, and the region maincenter bus is the 110kV buses that S1 collects station；The wherein idle change of P1 wind power plants is to maincenter
Bus sensitivity is 0.078 (kV/Mvar), to the sensitivity of P1 control bus is 0.098 (kV/Mvar), to the spirit of P2 control bus
Sensitivity 0.052 (kV/Mvar), change that P2 wind power plants are idle are 0.079 (kV/Mvar) to the sensitivity of maincenter bus, P1 are controlled
Bus sensitivity is 0.049 (kV/Mvar), to P2 control bus sensitivity 0.095 (kV/Mvar).According to electric connecting relation,
By topology search, simplification Equivalent Model as shown in Figure 2 is automatically formed.
Simplification Equivalent Model based on formation, the method for the present embodiment comprise the following steps:Preliminary setting data collection week
Phase T1 is 30 seconds, and normal controlling cycle T2 is 5 minutes, and initial condition data is as follows：
1) data acquisition is performed, each wind power plant is gathered and always generates electricity active-power P1=15MW, P2=36MW, idle work(
Rate Q1=8 (Mvar), Q2=26 (Mvar), wind power plant high side bus voltage V1=115.4kV, V2=117.8kV, wind-powered electricity generation converge
Collect region maincenter busbar voltage VPInstantaneous value 117.6kV；
2) to subregion ZkIn wind field P1, P2, perform following steps successively：
2-1) its active rate of change of calculating P1 wind power plants：
2-2) the R to obtainingk,i=0.012<R0(wherein R0For the active power of wind power field stability bandwidth critical parameter of setting,
The present embodiment R0It is arranged to 0.3).
2-3) P2 wind power plants in subregionWhole wind power plants are unsatisfactory for Rk,i＞ R0。
3) subregion ZkIn not have wind power plant active power fluctuation rate occur out-of-limit, when current time reaches normal cycle control
T2 (5 minutes) is carved, starts a normal cycle control, it is as follows：
3-1) in secondary voltage control, the object function of coordinated secondary voltage control model is constructed, and adds calculating about
Beam.Calculate the Reactive-power control amount Δ Q of P1 wind power plants1The Reactive-power control amount Δ Q of=5.2Mvar, P2 wind power plant2=-4.1Mvar；
3-2) utilize 3-1) total Reactive-power control amount Δ Q of wind field for being calculated of step1And Δ Q2, calculate：
The P1 wind power plant high side bus voltage setting values in the wheel automatism voltage control can be obtainedP2 wind power plants high side bus voltage is set
Each wind field high-voltage side bus setting value in the region being calculated 3-3) is issued to each wind field automatism voltage control
Substation performs.
It can be seen that in normal periodic Control, the object function of use had both considered the control targe of maincenter bus,
The harmony that wind power plant is idle in region is have also contemplated that, therefore control strategy adds wind power plant P1 idle output, reduces
Wind power plant P2 idle output, while the voltage of maincenter bus is maintained at the optimization target values of setting.
4) a new data acquisition is performed, each wind power plant is gathered and always generates electricity active-power P1=95MW, P2=25MW, it is idle
Power Q1=40 (Mvar) (upper limit 40Mvar, wind power plant P1 Reactive-power control abilities have been used up), Q2=16 (Mvar), wind power plant
High side bus voltage V1=114.3kV, V2=117.0kV, wind-powered electricity generation collection region maincenter busbar voltage VPInstantaneous value
116.5kV；
5) to subregion ZkIn wind field P1, P2, perform following steps successively：
5-1) calculate its active rate of change of P1：
5-2) the R to obtainingk,1=0.32 determines whether to meet RK,1＞ R0, (wherein R0For the active power of wind power field of setting
Stability bandwidth critical parameter, the present embodiment R0It is arranged to 0.3), meet condition, starts once quick voltage control；
6) subregion ZkThe active power fluctuation rate of middle P1 wind power plants is out-of-limit, and starting once quick voltage to the subregion controls,
It is as follows：
The object function of quick voltage Controlling model 6-1) is constructed, and adds calculating constraint.Calculate the nothing of P1 wind power plants
Work(regulated quantity Δ Q1The Reactive-power control amount Δ Q of=0Mvar, P2 wind power plant2=10.53Mvar；
6-2) calculated using 6-1 models, obtain total Reactive-power control amount Δ Q of each wind field1And Δ Q2, calculate：
The P1 wind power plant high side bus voltage setting values in the wheel agility automatism voltage control can be obtainedP2 wind power plants high side bus voltage is set
Each wind field high-voltage side bus setting value in the region being calculated 6-3) is issued to each wind field automatism voltage control
Substation performs.
7) epicycle terminates, and waits data acquisition next time, goes to step 1).
In epicycle agility automatism voltage control, because significantly active fluctuation occur in P1 wind fields, cause its bus electric
Pressure declines to a great extent, and due to the effect of automatism voltage control substation in P1 wind fields, it enters to reactive apparatus such as the blower fans in field
Go regulation, and all Reactive-power control ability has been used up, and now P1 wind fields high side bus voltage is still relatively low, in region
Pivot busbar voltage has also offset from optimization target values, the fluctuation situation of voltage occurs.And simultaneously although P2 wind fields have Reactive-power control
Ability, but the high side bus voltage of its own and the last round of setting value deviation issued be still less than controlling dead error (0.5kV),
Reactive power/voltage control substation in its wind field will not be controlled response.
Now by the judgement to the active stability bandwidth of P1 wind fields, the calculating of quick voltage control strategy is performed automatically, it is right
P2 has issued the alive regulating command of increasing, while P1 is issued and keeps the Heibei provincial opera of current voltage to instruct.It can be seen that by and
When adjust P2 wind power plants high side voltage setting value so that P2 wind field adjuster reactive apparatus, help eliminate maincenter bus
Voltage pulsation, the voltage of maincenter bus is maintained at the optimization target values of setting.
The technical scheme provided above the embodiment of the present invention is described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are set forth, the explanation of above example is only applicable to help and understands this
The principle of inventive embodiments；Meanwhile for those of ordinary skill in the art, according to the embodiment of the present invention, in specific embodiment party
There will be changes in formula and application, in summary, this specification content should not be construed as limiting the invention.
Claims (1)
1. a kind of quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output, it is characterised in that in power network
In control centre's automatic voltage control system, the AVC Two-stage control subregions k established to a wind-powered electricity generation collection region Controlling model
With with set ZkRepresent：Zk={ VP,VH,Pg,Qg, wherein VPRepresent the maincenter busbar voltage that each wind power plant is collected in the subregion, VH
Represent each wind power plant high-pressure side control bus voltage, P in the subregiongRepresent total active power output of each wind power plant, QgRepresent each wind
The total idle output of electric field；Preliminary setting data collection period T1 and data acquisition moment T, and normal controlling cycle T2, with T1
A data acquisition is carried out for the cycle, to generate a subnormal control instruction per normal controlling cycle T2；
This method comprises the following steps：
1) interim, the Two-stage control subregion Z collected to each wind-powered electricity generation is carried out at each data acquisition moment TkA data are carried out to adopt
Collection；The data of collection include：Each wind power plant always generates electricity active-power P in the secondary partitiong, reactive power Qg, wind power plant high-pressure side
Busbar voltage VH, wind-powered electricity generation collection region maincenter busbar voltage VPInstantaneous value；
2) each Two-stage control subregion Z is calculatedkIn each wind field i active power fluctuation rate and judge whether out-of-limit；Specifically include
Following steps：
2-1) calculate each wind field i active power fluctuation rate：
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Wherein：For current T moment, total active power output of the wind field；For total active power output of last moment wind field；
For total installed capacity of wind-driven power of the wind field；
2-2) the R to obtainingk,i, determine whether to meet Rk,i＞ R0, wherein R0For the active power of wind power field stability bandwidth threshold of setting
Parameter；If it is satisfied, explanation subregion ZkIn have that the active power fluctuation rate of wind power plant is out-of-limit, then perform step 3), otherwise return
Step 2-1) next wind power plant in subregion is continued with, completed until all wind power plants in subregion are handled；
If 2-3) subregion ZkIn whole wind power plants checked and any wind power plant is unsatisfactory for Rk,i＞ R0, then step is performed
It is rapid 4)；
3) as subregion ZkIn there are the active power fluctuation rate of wind power plant and more prescribe a time limit, then once quick voltage is started to the subregion
Control；Specifically include following steps：
The coordination secondary voltage sensitivity Controlling model being made up of object function constraints for 3-1) constructing the subregion is as follows：
Object function：
Constraints：
Wherein CgFor each wind power plant Reactive-power control amount Δ QgTo region maincenter busbar voltage VpSensitivity matrix, CvgFor each wind-powered electricity generation
Field Reactive-power control amount Δ QgTo wind field high-pressure side control bus voltage VHSensitivity matrix；
Constraints C0Represent the constraint for meeting wind power plant high side bus voltage regulation step-length；C1Expression meets wind field high-pressure side
The constraint of busbar voltage safe operation limit value；C2Represent the pact for meeting wind-powered electricity generation collection region maincenter busbar voltage limit value safe for operation
Beam；C3The constraint for meeting the total idle output of each wind power plant is represented, whereinWithFor each wind power plant automatism voltage control substation
The total idle output lower limit and higher limit, α sent in real time are gain coefficient；Represent the setting voltage in subregion；
The single step maximum adjustment amount allowed for generator high-voltage side bus, WpAnd WqFor weight coefficient,WithFor generator high pressure
The side bus voltage upper limit, lower voltage limit,WithFor maincenter bus voltage upper limit, lower voltage limit；
3-2) utilize 3-1) construction model calculated, obtain total Reactive-power control amount Δ Q of each wind fieldg, counted further according to formula (4)
Calculation obtains high side bus voltage setting value of each wind field in the wheel agility automatism voltage control
For bus current voltage value；
Each wind field high side bus voltage setting value in the region being calculated 3-3) is issued to the area as control instruction
Each wind field automatism voltage control substation in domain starts quick voltage control, goes to step 5)；
If 4) subregion ZkIn not have any wind power plant active power fluctuation rate occur out-of-limit, then check whether current time reaches just
Normal periodic Control T2, such as not up to T2, then perform step 5)；If reaching T2, start a normal voltage control, specific bag
Include following steps：
The normal Controlling model of coordination secondary voltage being made up of object function constraints for 4-1) constructing the subregion is as follows：
Object function：
Constraints：
Wherein ΘgFor the harmonious index of the idle output in wind field field in subregion；
4-2) utilizing 4-1) normal Controlling model calculated, obtain total Reactive-power control amount Δ Q of each wind fieldg, further according to formula (7)
High side bus voltage setting value of each wind field in the normal automatism voltage control of the wheel is calculated
For bus current voltage value；
Each wind field high side bus voltage setting value in the region being calculated 4-3) is issued to each wind field as control instruction
Automatism voltage control substation starts normal voltage control；Go to step 5)；
5) epicycle control terminates, and waits the moment of data acquisition next time to arrive, goes to step 1).
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| CN106208152B (en) * | 2016-07-20 | 2018-08-03 | 国家电网公司 | A kind of automatic voltage control method of wind fire collaboration |
| CN107248755B (en) * | 2017-07-25 | 2019-08-30 | 华中科技大学 | A kind of data center's renewable energy smoothing method of supplying power to |
| CN108879705B (en) * | 2018-06-11 | 2022-07-29 | 国电南瑞科技股份有限公司 | Wind power collection area reactive voltage control method considering wind power uncertainty |
| CN109524988B (en) * | 2018-11-26 | 2021-12-03 | 国网河北省电力有限公司 | Wind power collection station voltage control method based on total active power trend prediction |
| CN109361242B (en) * | 2018-12-24 | 2021-02-26 | 国网北京市电力公司 | Automatic voltage control method for photovoltaic power generation |
| CN109995041A (en) * | 2019-04-01 | 2019-07-09 | 南方电网科学研究院有限责任公司 | Three-level voltage control method, system and computer readable storage medium |
| CN110994626B (en) * | 2019-12-31 | 2023-03-24 | 云南电网有限责任公司昆明供电局 | 500-220kV regional power grid automatic voltage control method based on voltage trend prediction |
| CN113541184B (en) * | 2021-06-21 | 2024-03-08 | 广东电网有限责任公司电力调度控制中心 | Power grid secondary voltage control method facing offshore wind power collection area |
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