CN105720585B - The reactive power control method and system of wind power plant cluster - Google Patents
The reactive power control method and system of wind power plant cluster Download PDFInfo
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- CN105720585B CN105720585B CN201410720165.6A CN201410720165A CN105720585B CN 105720585 B CN105720585 B CN 105720585B CN 201410720165 A CN201410720165 A CN 201410720165A CN 105720585 B CN105720585 B CN 105720585B
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Abstract
The invention discloses a kind of reactive power control method of wind power plant cluster and system, this method includes：Wind power plant cluster control device from the voltage instruction that control centre issues extract wind power plant cluster in each wind power plant target grid entry point voltage；Detect the pre-set interval where the current grid entry point voltage that each wind power plant uploads；If controlling the substation wind power plant AVC in section is operated normally and entering local control model；If being in misoperation section, it controls the substation wind power plant AVC and enters coordinated control mode, it is selected to coordinate the substation AVC in wind power plant cluster according to reactive voltage sensitivity and the idle variable capacity of each wind power plant, control is assisted to reach target voltage in wind farm grid-connected voltage of coordinated control mode；If being in urgent operation section, controls the substation wind power plant AVC and enter emergent control mode, the grid entry point voltage of the wind power plant is controlled by the way of machine of cutting, removal of load or wind cutting field.
Description
Technical field
The present invention relates to wind power plant cluster control technology field more particularly to a kind of Reactive Power Controls of wind power plant cluster
Method and system.
Background technique
Currently, due to being influenced by hierarchical balance local compensation viewpoint, both at home and abroad for the most of wind power plant
Research emphasis has all concentrated on the reactive power and voltage control to single wind power plant, considers the cooperation between close wind power plant
It studies fewer.
China's wind power plant often concentrates construction, forms large-scale wind power plant cluster, and multiple wind power plants concentrate access same
Substation forms wind power plant cluster, brings difficulty to traffic department, from the aspects of idle, due to the fluctuation of wind-powered electricity generation, strongly
Influence regional voltage level.
In the more area of wind power plant, for it is this on geographical location it is neighbouring, have identical characteristic and access same change
The wind power plant cluster in power station, using wind power plant as basic unit, the reactive power/voltage control mode of local compensation be not it is optimal,
The mode that wind single game carries out alone reactive voltage adjusting is not able to satisfy the requirement of power grid, and reactive power distribution in region can be made not conform to
It is suitable, regional global voltage level decline.
Summary of the invention
The present invention provides a kind of reactive power control method of wind power plant cluster and systems, at least to solve wind power plant collection
The Reactive Power Control problem of group.
According to an aspect of the invention, there is provided a kind of reactive power control method of wind power plant cluster, wind power plant collection
Group control device receives the voltage instruction that issues of control centre, and from extracting each wind in wind power plant cluster in the voltage instruction
The target grid entry point voltage of electric field, wherein the change that each wind power plant is collected is arranged in the wind power plant cluster control device
Power station；The wind power plant cluster control device receives the current grid entry point voltage that each wind power plant uploads, and works as by described in
Preceding grid entry point voltage and pre-set interval are compared, and detect the section where the current grid entry point voltage；If described current
Grid entry point voltage, which is in, operates normally section, and the wind power plant cluster control device controls the substation the AVC (automatic electric of the wind power plant
Voltage-controlled system, Automatic Voltage Control) enter local control model, and the target is issued to the substation AVC
Grid entry point voltage reaches the target grid entry point voltage by the grid entry point voltage that reactive power compensation controls the wind power plant；
If the current grid entry point voltage is in misoperation section, the wind power plant cluster control device controls the wind power plant
The substation AVC enters coordinated control mode, according to the idle variable capacity of reactive voltage sensitivity and each wind power plant in the wind-powered electricity generation
The selection coordination substation AVC, controls the substation coordination AVC output reactive power in the cluster of field, to assist to control in coordination control
The grid entry point voltage of the wind power plant of molding formula reaches the target grid entry point voltage；If the current grid entry point voltage is in tight
Anxious traffic coverage, the substation AVC that the wind power plant cluster control device controls the wind power plant enter emergent control mode, using cutting
The mode of machine, removal of load or wind cutting field controls the grid entry point voltage of the wind power plant.
In one embodiment, the pre-set interval is divided according to wind farm grid-connected voltage, operates normally section
ForMisoperation section isOrUrgent operation section be or in which, i indicate wind power plant number, ViIndicate wind farm grid-connected voltage,
In one embodiment, according to the idle variable capacity of reactive voltage sensitivity and each wind power plant in the wind power plant
The selection coordination substation AVC includes in cluster：All wind power plants are calculated using the following equation in the wind power plant cluster in association
Adjust the reactive voltage sensitivity coefficient matrix S of the wind power plant i of control model：S=- (B ")-1V-1, wherein reactive voltage sensitivity
Element S in coefficient matrix SijThe spirit that the grid entry point reactive power of wind power plant j is changed for the grid entry point voltage change of wind power plant i
Sensitivity coefficient；B " is the admittance matrix of route in the wind power plant cluster, matrix's reversibility；V=diag (V1,V2,...,Vn) indicate
Wind turbines set end voltage shares n node；By the sensitivity coefficient S in reactive voltage sensitivity coefficient matrix SijAccording to from
Arrive greatly it is small be ranked up, and the substation AVC of wind power plant corresponding to the sensitivity coefficient of selected and sorted in front is as the association
Adjust the substation AVC.
In one embodiment, the substation coordination AVC output reactive power is controlled, to assist control to be in coordinated control
The grid entry point voltage of the wind power plant of mode reaches the target grid entry point voltage：According to the wind-powered electricity generation for being in coordinated control mode
The current grid entry point voltage of field and the difference of the target grid entry point voltage, calculating the substation coordination AVC needs nothing to be offered
Function adjustment amount；The idle coordinated control instruction for carrying the idle adjustment amount, the coordination are issued to the coordination substation AVC
The substation AVC makes the grid entry point voltage of the wind power plant in coordinated control mode according to the idle adjustment amount output reactive power
Reach the target grid entry point voltage；Wherein, after the substation coordination AVC is according to the idle adjustment amount output reactive power,
The grid entry point voltage for coordinating the corresponding wind power plant in the substation AVC, which is in, operates normally section.
In one embodiment, according to the current grid entry point voltage of the wind power plant in coordinated control mode and the target
The difference of grid entry point voltage, calculating the substation the coordination AVC need idle adjustment amount to be offered includes：It is calculated using the following equation
The idle adjustment amount Δ Q for coordinating the substation AVCi：ΔVj=S Δ Qi, wherein Δ VjFor the wind-powered electricity generation in coordinated control mode
The current grid entry point voltage of field j and the difference of the target grid entry point voltage, idle adjustment amount Δ QiIn the substation coordination AVC
Variable capacity within the scope of.
In one embodiment, the grid entry point electricity of the wind power plant is controlled by the way of machine of cutting, removal of load or wind cutting field
Briquetting includes：The substation AVC in emergent control mode issues Reactive-power control and instructs to Wind turbines in the wind power plant or idle
After compensating equipment, the wind power plant cluster control device detection reaches deliberate action delay time, then control is in emergent control
The substation AVC of mode carries out cutting machine, removal of load or wind cutting field, wherein the deliberate action delay time is greater than described in tight
The action cycle of the substation AVC of anxious control model, the action cycle are under the substation AVC in emergent control mode
Reactive-power control sent instructions to the time of Wind turbines or reactive-load compensation equipment execution movement；Wherein, if wind farm grid-connected point electricity
Pressure confirms that reactive power compensation planning is used up, cuts off the submitting line of the wind power plant in the given time always above the peak of setting
Road.
According to another aspect of the present invention, a kind of power reactive power control system of wind power plant cluster is provided, including：It adjusts
Degree center, wind power plant cluster control device and wind power plant cluster, wherein the wind power plant cluster include at least two wind power plants and
The substation that at least two wind power plant is collected is arranged in the corresponding substation AVC, the wind power plant cluster control device；It is described
Wind power plant cluster control device includes：Obtain module, detection module and control module；The acquisition module, it is described for receiving
The voltage instruction that control centre issues, and extract from the voltage instruction target grid entry point electricity of at least two wind power plant
Pressure；The detection module, the current grid entry point voltage uploaded for receiving at least two wind power plant, and will it is described currently simultaneously
Site voltage and pre-set interval are compared, and detect the section where the current grid entry point voltage；The control module, is used for
In the case where the current grid entry point voltage is in and operates normally section, the substation AVC for controlling the wind power plant enters local control
Molding formula, and the target grid entry point voltage is issued to the substation AVC, the wind power plant is controlled by reactive power compensation
Grid entry point voltage reaches the target grid entry point voltage；The case where the current grid entry point voltage is in misoperation section
Under, the substation AVC for controlling the wind power plant enters coordinated control mode, can according to reactive voltage sensitivity and the idle of each wind power plant
Capacitance-adjustable selects to coordinate the substation AVC in the wind power plant cluster, controls the substation coordination AVC output reactive power, with association
Control is helped to reach the target grid entry point voltage in the grid entry point voltage of the wind power plant of coordinated control mode；And work as described
In the case that preceding grid entry point voltage is in urgent operation section, the substation AVC for controlling the wind power plant enters emergent control mode, adopts
The grid entry point voltage of the wind power plant is controlled with the mode of machine of cutting, removal of load or wind cutting field.
In one embodiment, the control module includes：First control unit, it is described for being calculated using the following equation
Reactive voltage sensitivity coefficient matrix S of all wind power plants to the wind power plant i in coordinated control mode in wind power plant cluster：S
=-(B ")-1V-1, wherein the element S in reactive voltage sensitivity coefficient matrix SijFor the grid entry point voltage change pair of wind power plant i
The sensitivity coefficient that the grid entry point reactive power of wind power plant j changes；B " is the admittance matrix of route in the wind power plant cluster, square
Battle array is reversible；V=diag (V1,V2,...,Vn) indicate Wind turbines set end voltage, share n node；By reactive voltage sensitivity
Sensitivity coefficient S in coefficient matrix SijAccording to being ranked up from big to small；The sensitivity coefficient institute of selected and sorted in front is right
The substation AVC for the wind power plant answered is as the substation coordination AVC.
In one embodiment, the control module includes：Second control unit, for according in coordinated control mode
Wind power plant current grid entry point voltage and the target grid entry point voltage difference, calculate the substation coordinations AVC needs and mention
The idle adjustment amount supplied；The idle coordinated control instruction for carrying the idle adjustment amount, institute are issued to the coordination substation AVC
It states and coordinates the substation AVC according to the idle adjustment amount output reactive power, make the grid-connected of the wind power plant in coordinated control mode
Point voltage reaches the target grid entry point voltage；Wherein, the substation coordination AVC exports idle function according to the idle adjustment amount
After rate, the grid entry point voltage for coordinating the corresponding wind power plant in the substation AVC, which is in, operates normally section.
In one embodiment, the control module includes：Third control unit, for being in emergent control mode
The substation AVC issues Reactive-power control and instructs to after the Wind turbines or reactive-load compensation equipment in the wind power plant, and detection reaches default dynamic
Make delay time, control carries out cutting machine, removal of load or wind cutting field in the substation AVC of emergent control mode, wherein described default
The action delay time is greater than the action cycle of the substation AVC in emergent control mode, and the action cycle is from described
The substation AVC in emergent control mode issue Reactive-power control instruction to Wind turbines or reactive-load compensation equipment execution act when
Between；Wherein, if wind farm grid-connected voltage confirms reactive power compensation planning in the given time always above the peak of setting
It uses up, cuts off the submitting route of the wind power plant.
The reactive power control method and system of wind power plant cluster through the invention, it is pre- for wind farm grid-connected voltage
If traffic coverage, wind power plant cluster control device, association is arranged in the substation that each wind power plant is collected in corresponding different control model
The control to wind power plant cluster is completed at auxiliary dispatch center jointly, power output that each wind power plant of coordinated control is idle, is reducing idle storage
On the basis of standby, guarantee that the voltage of each wind power plant keeps stablizing, improves regional voltage level, optimization large-scale wind power field group's
Reactive power.Also, emergent control is carried out by the way of machine of cutting, removal of load or wind cutting field, avoids wind power plant cluster
Extensive off-grid, system unstability, the serious consequences such as area power grid collapse of voltage.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted a limitation of the invention.In the accompanying drawings：
Fig. 1 is the flow chart of the reactive power control method of the wind power plant cluster of the embodiment of the present invention；
Fig. 2 is the structural block diagram of the power reactive power control system of the wind power plant cluster of the embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the invention provides a kind of reactive power control method of wind power plant cluster, Fig. 1 is the embodiment of the present invention
Wind power plant cluster reactive power control method flow chart.As shown in Figure 1, this approach includes the following steps：
Step S101, wind power plant cluster control device receive the voltage instruction that control centre issues, and from voltage instruction
Extract the target grid entry point voltage of each wind power plant in wind power plant cluster.Wherein, wind power plant cluster control device is arranged each
The substation that wind power plant is collected assists control centre to complete the control to wind power plant cluster jointly.Each wind in wind power plant cluster
The target grid entry point voltage of electric field is identical.
Step S102, wind power plant cluster control device receives the current grid entry point voltage that each wind power plant uploads, and will work as
Preceding grid entry point voltage and pre-set interval are compared, and detect the section where current grid entry point voltage.To each wind power plant, respectively
The pre-set interval where its current grid entry point voltage is detected, with the corresponding control model of determination.
Step S103, if current grid entry point voltage, which is in, operates normally section, the control of wind power plant cluster control device should
The substation AVC of wind power plant enters local control model, and issues target grid entry point voltage to the substation AVC, is mended by reactive power
The grid entry point voltage for repaying control wind power plant reaches target grid entry point voltage.Current grid entry point voltage, which is in, operates normally section, table
Show that wind power plant can be exported by own reactive, grid entry point voltage is made to reach target voltage.
Step S104, if current grid entry point voltage is in misoperation section, the control of wind power plant cluster control device should
The substation AVC of wind power plant enters coordinated control mode, is existed according to the idle variable capacity of reactive voltage sensitivity and each wind power plant
The substation AVC is coordinated in selection in wind power plant cluster, is controlled and is coordinated the substation AVC output reactive power, to assist control in coordination control
The grid entry point voltage of the wind power plant of molding formula reaches target grid entry point voltage.Current grid entry point voltage is in misoperation section,
Indicate the idle deficiency of wind power plant, grid entry point voltage out-of-limit enters misoperation area, is difficult to make grid entry point by own reactive output
Voltage reaches target voltage, needs the assistance of other measures.Suitable wind power plant is selected to coordinate currently simultaneously in wind power plant cluster
Site voltage is in the wind power plant in misoperation section, carries out reactive power output, can reach target voltage.
Step S105, if current grid entry point voltage is in urgent operation section, the control of wind power plant cluster control device should
The substation AVC of wind power plant enters emergent control mode, controls the wind power plant by the way of machine of cutting, removal of load or wind cutting field
Grid entry point voltage.
The reactive power control method of wind power plant cluster through the embodiment of the present invention, it is pre- for wind farm grid-connected voltage
If traffic coverage, wind power plant cluster control device, association is arranged in the substation that each wind power plant is collected in corresponding different control model
The control to wind power plant cluster is completed at auxiliary dispatch center jointly, power output that each wind power plant of coordinated control is idle, is reducing idle storage
On the basis of standby, guarantee that the voltage of each wind power plant keeps stablizing, improves regional voltage level, optimization large-scale wind power field group's
Reactive power.Also, emergent control is carried out by the way of machine of cutting, removal of load or wind cutting field, avoids wind power plant cluster
Extensive off-grid, system unstability, the serious consequences such as area power grid collapse of voltage.
Above-mentioned pre-set interval is divided according to wind farm grid-connected voltage, is operated normally section and isMisoperation section isOrUrgent operation section be or in which, i indicates the number of wind power plant, and Vi indicates wind farm grid-connected voltage, demarcation interval, and the voltage that can make full use of each wind power plant substation itself in cluster is adjusted
Ability helps according to different modes to control effectively to the output reactive power of wind power plant and grid entry point voltage, improves
Efficiency.
《State Grid Corporation of China's wind power plant accesses electric power network technique regulation》Wind farm grid-connected voltage is distinctly claimed, is advised
Require grid entry point voltage that can only fluctuate in -3%~7% range of voltage rating in fixed.Therefore, it can be setP.u. it is perunit value, indicates the multiple of voltage rating.It is inverse according to electric system
In order to guarantee wind farm grid-connected voltage stabilization, when output of wind electric field is larger, its voltage is arranged in pressure regulation thoughtWhen output of wind electric field is smaller, its voltage is set
According to wind power plant current grid entry point voltage locating for section, the control of the substation wind power plant AVC can be divided into
Lower three kinds of control models：
(1) local control model：Wind farm grid-connected at this time voltage, which is in, operates normally section, and wind power plant AVC is held substation
The voltage instruction that row wind power plant cluster control device issues.
(2) coordinated control mode：Wind farm grid-connected at this time voltage is in misoperation section, and wind power plant AVC is held substation
The idle adjustment instruction that row wind power plant cluster control device issues provides reactive power support for wind power plant cluster regional power grid, until
All wind power plant substations are in local control model.Consider the coordination of reactive power between wind power plant.
(3) emergent control mode：Wind farm grid-connected at this time voltage is in urgent operation section, i.e. the voltage warp of wind power plant
Crossing local control and coordinated control still cannot effectively restore (reactive power compensation planning is used up), further deteriorate and enter urgent operation
Section should carry out emergent control to wind power plant at this time.
Under normal conditions, each substation AVC in wind power plant cluster region operates in local control model, by the substation AVC
Grid entry point voltage is automatically controlled near target voltage values.When the weaker substation i of Reactive-power control ability in cluster is unable to satisfy this
Ground reactive requirement is unable to maintenance voltage in target value by our station control and wind farm grid-connected voltage or cluster collects substation
Voltage change beyond voltage operate normally section, (substation AVC can be described as when voltage out-of-limit enters misoperation section
Out-of-limit substation), out-of-limit substation sends warning message to wind power plant cluster control device, and enters coordinated control mode.Wind power plant
Clustered control device issues idle coordinated control instruction to the related substation for participating in coordinated control, utilizes what is had more than needed in cluster regions
Reactive power compensation planning provides reactive power support for wind power plant i, and wind power plant i grid entry point voltage is made to restore normal level.
Under local control model, the substation wind power plant AVC receives the grid entry point voltage that wind power plant cluster control device issues
Target value, and the current grid entry point voltage (i.e. actual value) of real-time monitoring wind power plant, obtain the difference of target value and actual value, use
The optimisation strategy of substation optimizes wind power plant, on the basis of guaranteeing wind farm grid-connected voltage-tracing target voltage, makes
Wind power plant builtin voltage obtains optimal.
When some wind power plant is idle insufficient in cluster regions, wind farm grid-connected voltage out-of-limit enters misoperation section
When, which enters coordinated control mode.The variable capacity of reactive apparatus in field is uploaded to wind power plant by wind power plant
Clustered control device, wind power plant cluster control device are selected according to the idle variable capacity of reactive voltage sensitivity and each wind power plant
The substation for participating in coordinated control is calculated the idle adjustment amount for coordinating substation by the voltage deviation value of out-of-limit substation, then issued
Idle adjustment amount to coordinate substation.
Coordinate the selection of substation for the cluster of large-scale wind power field, control target makes the voltage symbol for collecting substation
On the basis of closing scheduling requirement, regional nodes voltage meets the requirements and is optimized.Due to the randomness of wind energy, extensive wind
Wind power plant active power output in electric field cluster can constantly change, and will lead to each wind farm grid-connected voltage ceaselessly wave in this way
It is dynamic.When carrying out Load flow calculation, for the high-tension line of large-scale wind power field cluster, reactance value is often much larger than
Its resistance value can be obtained according to PQ decomposition method：
Δ Q=-VB " Δ V (1)
Δ Q is the reactive power changing value of wind farm grid-connected point output in formula (1)；B " is large-scale wind power field cluster interior lines
The admittance matrix on road, matrix's reversibility, matrix belong to sparse type matrix；V=diag (V1,V2,...,Vn) indicate Wind turbines generator terminal
Voltage shares n node；Δ V is each node voltage variable quantity in region.It can be obtained by formula (1)：
Δ V=- (B ")-1V-1ΔQ (2)
Then reactive voltage sensitivity system of all wind power plants to the wind power plant in coordinated control mode in wind power plant cluster
Matrix number S (alternatively referred to as voltage is to idle sensitivity coefficient matrix S) is：
S=- (B ")-1V-1 (3)
Element S in formula (3) in reactive voltage sensitivity coefficient matrix SijFor wind power plant i grid entry point voltage change to wind
(alternatively referred to as i-th voltage change is to the idle change of jth point for the sensitivity coefficient that the grid entry point reactive power of electric field j changes
Sensitivity coefficient), size is related with each node voltage value of power grid and network architecture parameters；SiiOur station is adjusted for our station voltage
Idle sensitivity.
The selection gist for coordinating substation is the size of wind power plant substation numerical value in sensitivity coefficient matrix, preferential to select spirit
The big substation of sensitivity.Specifically, can be by the sensitivity coefficient S in reactive voltage sensitivity coefficient matrix SijAccording to from big to small
It is ranked up, and the substation AVC of wind power plant corresponding to the sensitivity coefficient of selected and sorted in front is as the coordination substation AVC.
To prevent some wind power plant from the case where Reactive-power control ability is used up occur, the coordination substation being selected should all participate in coordinating control as far as possible
System.One or more coordination substations can be selected according to the actual situation, choose the big conduct of sensitivity and coordinate substation, it can be fast
Speed response reaches target grid entry point voltage to adjust the idle of the substation in coordinated control mode.If sensitivity is most
The idle variable capacity of big substation is insufficient, being it there are under the premise of certain nargin, uses sensitivity second or smaller
Substation is also as coordination substation.
In one embodiment, the substation AVC output reactive power is coordinated in control in step S104, to assist control in association
The grid entry point voltage of the wind power plant of tune control model reaches target grid entry point voltage and may include：According in coordinated control mode
Wind power plant current grid entry point voltage and target grid entry point voltage difference, calculate coordinate the substation AVC need it is to be offered idle
Adjustment amount；The idle coordinated control instruction for carrying idle adjustment amount is issued to the coordination substation AVC, coordinates the substation AVC according to nothing
Function adjustment amount output reactive power makes the grid entry point voltage of the wind power plant in coordinated control mode reach target grid entry point electricity
Pressure；Wherein, after coordinating the substation AVC according to idle adjustment amount output reactive power, coordinate the grid-connected of the corresponding wind power plant in the substation AVC
Point voltage, which is in, operates normally section.
Preferably, the idle adjustment amount Δ Q for coordinating the substation AVC i can be calculated using the following equationi：
ΔVj=S Δ Qi (4)
In formula (4), Δ VjFor current grid entry point voltage and target the grid entry point electricity of the wind power plant j in coordinated control mode
The difference (the voltage deviation amount of i.e. out-of-limit substation) of pressure；The idle adjustment amount for being handed down to the coordination substation AVC i should coordinate AVC
Within the scope of the variable capacity of substation i.
Constraint condition is as follows：
1) the idle adjustment amount Δ Q that wind power plant cluster control device is issued to substationiIt should be in the variable capacity range of substation
QavaIt is interior：
0<ΔQi<Qava (5)
2) after substation adjustment is idle, substation voltage Vi newShould be maintained at allows in range of operation：
In one embodiment, the wind power plant is controlled by the way of machine of cutting, removal of load or wind cutting field in step S105
Grid entry point voltage may include：The substation AVC in emergent control mode issues Reactive-power control and instructs in the wind power plant
After Wind turbines or reactive-load compensation equipment, the detection of wind power plant cluster control device reaches deliberate action delay time, then at control
It carries out cutting machine, removal of load or wind cutting field in the substation AVC of emergent control mode, wherein deliberate action delay time, which is greater than, to be in
The action cycle of the substation AVC of emergent control mode, the action cycle be from emergent control mode the substation AVC issue it is idle
The time that regulating command is acted to Wind turbines or reactive-load compensation equipment execution；Wherein, if wind farm grid-connected voltage is pre-
(for example, 30 minutes) confirm that reactive power compensation planning is used up, cut off the wind power plant always above the peak of setting in fixing time
Send out route.
It is that the Reactive-power control ability of AVC system is made to be fully used that action delay, which is arranged, in the feelings that reactive power capability is used up
Under condition, just carry out cutting the emergent controls such as machine, wind cutting field.The action cycle of the substation wind power plant AVC is from sending instructions under substation wind
The time of machine or reactive-load compensation equipment movement, action cycle of the substation AVC is general≤and 30 seconds.For example, deliberate action can be prolonged
When the time be set as 45 seconds.
Under extreme wind weather condition, the active power output of wind power plant cluster may be very high or even close to nominal output, is
System reactive loss obviously increases, and system voltage degradation due to idle insufficient is far below voltage rating.It is electric in cluster regions
When large disturbances occur for net, wind power plant, which collects substation and regional power grid, will drastically reduce or increase, if taken not in time
Control measure are imitated, may cause the serious consequences such as the extensive off-grid, system unstability, area power grid collapse of voltage of wind farm group.
When operation of power networks is under minimum mode, wind farm grid-connected point, wind power plant cluster critical point and region voltage may be serious higher, very
Allow the upper limit to being possible to run more than voltage.
In the case that wind farm grid-connected point, wind power plant collect substation bus bar voltage beyond its normal control ability, need
Carry out the emergent control of reactive voltage.When carrying out emergent control, it is considered as setting action delay, makes the idle of the substation AVC
Regulating power is fully used, and in the case where reactive power capability is used up, just carries out cutting the promptly control such as machine, removal of load, wind cutting field
System.The setting of action delay should be greater than the action cycle of the substation wind power plant AVC.Can set the action delay of emergent control as：Δ t=
45 seconds.
The machine of cutting refers to excision wind power plant cluster inner part regulating power deficiency or apart from the farther away Wind turbines of substation.It gets rid of
Load relies primarily on low-voltage load sheding device cut-away area grid parts load, preferentially inessential negative in the excision of voltage minimum point
Lotus.When having power load in regional power grid, cut-out Wind turbines or cut-out power load both modes can be used.
When in the power grid of cluster regions without power load, the machine mode of cutting can only be taken to carry out emergent control.
When large-scale wind power field cluster wind-force is smaller, some wind power plants active power output in region may very little, in this way
The charge power of route may be such that wind farm grid-connected voltage increases, it could even be possible to the model beyond wind power plant automatic adjustment
It encloses, when wind farm grid-connected voltage is higher than the peak of setting for a long time, needs to cut off the wind power plant.When wind power plant collects change
The voltage of the bus in power station is higher thanWhen, when confirmation Reactive-power control equipment is used up, cuts off a certain wind power plant and send out route.
Based on the same inventive concept, the embodiment of the invention also provides a kind of Reactive Power Control systems of wind power plant cluster
System, can be used to implement method described in above-described embodiment, such as the following examples.Due to the reactive power of wind power plant cluster
The principle that control system solves the problems, such as is similar to the reactive power control method of wind power plant cluster, therefore wind power plant cluster is idle
The implementation of power control system may refer to the implementation of the reactive power control method of wind power plant cluster, and it is no longer superfluous to repeat place
It states.
Fig. 2 is the structural block diagram of the power reactive power control system of the wind power plant cluster of the embodiment of the present invention, as shown in Fig. 2,
The system includes：Control centre 10, wind power plant cluster control device 20 and wind power plant cluster 30, wind power plant cluster 30 include at least
Two wind power plants 31 and the corresponding substation AVC 32, wind power plant cluster control device 20 are arranged in what at least two wind power plants were collected
Substation.The structure is specifically described below.
Wind power plant cluster control device 20 includes：Obtain module 21, detection module 22 and control module 23.
Module 21, the voltage instruction issued for receiving control centre are obtained, and extracts at least two from voltage instruction
The target grid entry point voltage of wind power plant.
Detection module 22 is connected to and obtains module 21, for receiving the current grid entry point electricity of at least two wind power plants upload
Pressure, and current grid entry point voltage and pre-set interval are compared, detect the section where current grid entry point voltage.
Control module 23 is connected to detection module 22, for being in the feelings for operating normally section in current grid entry point voltage
Under condition, the substation AVC for controlling the wind power plant enters local control model, and issues corresponding target grid entry point electricity to the substation AVC
Pressure reaches target grid entry point voltage by the grid entry point voltage that reactive power compensation controls wind power plant；In current grid entry point voltage
In the case where misoperation section, the substation AVC for controlling the wind power plant enters coordinated control mode, according to reactive voltage spirit
The idle variable capacity of sensitivity and each wind power plant selects to coordinate the substation AVC in wind power plant cluster, and the output of the substation AVC is coordinated in control
Reactive power, to assist control to reach target grid entry point voltage in the grid entry point voltage of the wind power plant of coordinated control mode；With
And in the case where current grid entry point voltage is in urgent operation section, the substation AVC for controlling the wind power plant enters emergent control
Mode controls the grid entry point voltage of the wind power plant by the way of machine of cutting, removal of load or wind cutting field.
The power reactive power control system of wind power plant cluster through the embodiment of the present invention, it is pre- for wind farm grid-connected voltage
If traffic coverage, wind power plant cluster control device, association is arranged in the substation that each wind power plant is collected in corresponding different control model
The control to wind power plant cluster is completed at auxiliary dispatch center jointly, power output that each wind power plant of coordinated control is idle, is reducing idle storage
On the basis of standby, guarantee that the voltage of each wind power plant keeps stablizing, improves regional voltage level, optimization large-scale wind power field group's
Reactive power.Also, emergent control is carried out by the way of machine of cutting, removal of load or wind cutting field, avoids wind power plant cluster
Extensive off-grid, system unstability, the serious consequences such as area power grid collapse of voltage.
Reactive-load compensation equipment, such as SVG or SVC etc. can also be set in each wind power plant.
In one embodiment, control module 23 includes：First control unit, for being calculated using the following equation wind power plant
Reactive voltage sensitivity coefficient matrix S of all wind power plants to the wind power plant i in coordinated control mode in cluster：
S=- (B ")-1V-1
Wherein, the element S in reactive voltage sensitivity coefficient matrix SijFor wind power plant i grid entry point voltage change to wind-powered electricity generation
The sensitivity coefficient that the grid entry point reactive power of field j changes；B " is the admittance matrix of route in wind power plant cluster, matrix's reversibility；V
=diag (V1,V2,...,Vn) indicate Wind turbines set end voltage, share n node；By reactive voltage sensitivity coefficient matrix S
In sensitivity coefficient SijAccording to being ranked up from big to small；Wind power plant corresponding to the sensitivity coefficient of selected and sorted in front
The substation AVC as coordinate the substation AVC.
In one embodiment, control module 23 includes：Second control unit, for basis in coordinated control mode
The current grid entry point voltage of wind power plant and the difference of target grid entry point voltage, calculating the coordination substation AVC needs idle tune to be offered
Whole amount；The idle coordinated control instruction for carrying idle adjustment amount is issued to the coordination substation AVC, coordinates the substation AVC according to idle
Adjustment amount output reactive power makes the grid entry point voltage of the wind power plant in coordinated control mode reach target grid entry point voltage；
Wherein, after coordinating the substation AVC according to idle adjustment amount output reactive power, coordinate the grid entry point of the corresponding wind power plant in the substation AVC
Voltage, which is in, operates normally section.
In one embodiment, control module 23 includes：Third control unit, for being in emergent control mode
The substation AVC issues Reactive-power control and instructs to after the Wind turbines or reactive-load compensation equipment in the wind power plant, and detection reaches default dynamic
Make delay time, control carries out cutting machine, removal of load or wind cutting field in the substation AVC of emergent control mode, wherein deliberate action
Delay time is greater than the action cycle of the substation AVC in emergent control mode, and the action cycle is from emergent control mode
The substation AVC issue the time that Reactive-power control instruction is acted to Wind turbines or reactive-load compensation equipment execution；Wherein, if wind-powered electricity generation
Field grid entry point voltage confirms that reactive power compensation planning is used up, cuts off the wind-powered electricity generation in the given time always above the peak of setting
The submitting route of field.
Used above, the group of the software and/or hardware of predetermined function may be implemented in term " unit " or " module "
It closes.Although system described in following embodiment is preferably realized with software, the combination of hardware or software and hardware
Realization be also that may and be contemplated.Certainly, above-mentioned module divides a kind of only signal and divides, the invention is not limited to
This.As long as the module for being able to achieve the purpose of the present invention divides, it is within the scope of protection of the invention.
The Reactive Power Control of wind power plant cluster is divided into two-stage, first is that this ground level controls, it is individually complete by wind power plant substation
At.Second is that coordinated control, is completed by each wind power plant in wind power plant cluster control device coordination region.Wind power plant cluster control
The control object of device mainly includes that wind power plant collects each wind power plant in substation and region, collects power transformation with wind power plant
Busbar voltage of standing trace scheduling voltage instruction is target, and the idle output of each wind power plant, makes full use of wind-powered electricity generation in coordination region
The reactive power of field guarantees the voltage stabilization of large-scale wind power field cluster regions.Wind power plant cluster control device with higher level's pivot
The active power and reactive power of the connecting line of knob substation are control target, receive the control life that main website of control centre is assigned
It enables, realizes the active power and reactive power equilibrium in region within the jurisdiction.
For the above-mentioned neighbouring, wind power plant cluster that has identical characteristic and access same substation on geographical location, into
The unified coordinated management of row, can be effectively improved the randomness, fluctuation and intermittence of single wind power plant, make it in installation scale and
It is close with normal power supplies on external modulating properties, be conducive to the ability for improving responsive electricity grid scheduling and control.
In conclusion the reactive power control method and system of wind power plant cluster of the invention, for by multiple wind power plants
Collect the region voltage management for accessing the large-scale wind power field group of same substation's composition.To collect substation bus bar voltage-tracing
Dispatch command is target, and the reactive power of each wind power plant in coordinated control cluster regions makes full use of the idle money of each wind power plant
Source, each wind power plant can be supported mutually, keep reactive power in region mutually coordinated, while trace scheduling instruction, make wind
Electric field grid entry point voltage is optimized.Collect substation in wind power plant and sets up wind power plant cluster control device, auxiliary dispatching center
The control of cluster regions power coordination is carried out, regional voltage is optimized.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (8)
1. a kind of reactive power control method of wind power plant cluster, which is characterized in that including：
Wind power plant cluster control device receives the voltage instruction that control centre issues, and extracts wind power plant from the voltage instruction
The target grid entry point voltage of each wind power plant in cluster, wherein the wind power plant cluster control device is arranged in each wind
The substation that electric field collects；
The wind power plant cluster control device receives the current grid entry point voltage that each wind power plant uploads, and will be described current
Grid entry point voltage and pre-set interval are compared, and detect the section where the current grid entry point voltage；
If the current grid entry point voltage, which is in, operates normally section, the wind power plant cluster control device controls the wind power plant
The substation AVC enter local control model, and issue the target grid entry point voltage to the substation AVC, pass through reactive power
The grid entry point voltage that compensation controls the wind power plant reaches the target grid entry point voltage；
If the current grid entry point voltage is in misoperation section, the wind power plant cluster control device controls the wind power plant
The substation AVC enter coordinated control mode, according to the idle variable capacity of reactive voltage sensitivity and each wind power plant in the wind
The selection coordination substation AVC, controls the substation coordination AVC output reactive power in electric field cluster, to assist control in coordination
The grid entry point voltage of the wind power plant of control model reaches the target grid entry point voltage；
If the current grid entry point voltage is in urgent operation section, the wind power plant cluster control device controls the wind power plant
The substation AVC enter emergent control mode, the grid entry point of the wind power plant is controlled by the way of machine of cutting, removal of load or wind cutting field
Voltage；
The substation coordination AVC output reactive power is controlled, to assist control in the grid-connected of the wind power plant of coordinated control mode
Point voltage reaches the target grid entry point voltage and includes：
According to the difference of the current grid entry point voltage of the wind power plant in coordinated control mode and the target grid entry point voltage, meter
Calculating the substation coordination AVC needs idle adjustment amount to be offered；
The idle coordinated control instruction for carrying the idle adjustment amount, coordination AVC are issued to the coordination substation AVC
It stands according to the idle adjustment amount output reactive power, the grid entry point voltage of the wind power plant in coordinated control mode is made to reach institute
State target grid entry point voltage；Wherein, after the substation coordination AVC is according to the idle adjustment amount output reactive power, the association
It adjusts the grid entry point voltage of the corresponding wind power plant in the substation AVC to be in and operates normally section.
2. the method according to claim 1, wherein the pre-set interval is carried out according to wind farm grid-connected voltage
It divides, operating normally section isMisoperation section isOrUrgent operation section isOrWherein, i indicates the number of wind power plant, ViIt indicates
Wind farm grid-connected voltage, AndIndicate voltage.
3. the method according to claim 1, wherein can according to reactive voltage sensitivity and the idle of each wind power plant
Capacitance-adjustable selects to coordinate the substation AVC in the wind power plant cluster：
It is calculated using the following equation nothing of all wind power plants to the wind power plant i for being in coordinated control mode in the wind power plant cluster
Function voltage sensibility coefficient matrix S：
S=- (B ")-1V-1
Wherein, the element S in reactive voltage sensitivity coefficient matrix SijFor wind power plant i grid entry point voltage change to wind power plant j
Grid entry point reactive power change sensitivity coefficient；B " is the admittance matrix of route in the wind power plant cluster, matrix's reversibility；
V=diag (V1,V2,...,Vn) indicate Wind turbines set end voltage, share n node；
By the sensitivity coefficient S in reactive voltage sensitivity coefficient matrix SijAccording to being ranked up from big to small, and selected and sorted
The substation AVC of wind power plant corresponding to sensitivity coefficient in front is as the substation coordination AVC.
4. the method according to claim 1, wherein according in coordinated control mode wind power plant it is current simultaneously
The difference of site voltage and the target grid entry point voltage, calculating the substation coordination AVC needs idle adjustment amount packet to be offered
It includes：
It is calculated using the following equation the idle adjustment amount Δ Q for coordinating the substation AVCi：
ΔVj=S Δ Qi
Wherein, Δ VjFor the current grid entry point voltage and the target grid entry point voltage of the wind power plant j in coordinated control mode
Difference, S are reactive voltage sensitivity coefficient matrix, idle adjustment amount Δ QiIn the variable capacity range for coordinating the substation AVC
It is interior.
5. the method according to claim 1, wherein being controlled by the way of machine of cutting, removal of load or wind cutting field
The grid entry point voltage of the wind power plant includes：
The substation AVC in emergent control mode issue Reactive-power control instruct in the wind power plant Wind turbines or reactive compensation
After equipment, the wind power plant cluster control device detection reaches deliberate action delay time, then control is in emergent control mode
The substation AVC carry out cutting machine, removal of load or wind cutting field, wherein the deliberate action delay time is greater than described in urgent control
The action cycle of the substation AVC of molding formula, the action cycle are idle under the substation AVC in emergent control mode
Adjust the time to send instructions to Wind turbines or reactive-load compensation equipment execution movement；Wherein, if wind farm grid-connected voltage exists
Always above the peak of setting in predetermined time, confirmation reactive power compensation planning is used up, and cuts off the submitting route of the wind power plant.
6. a kind of power reactive power control system of wind power plant cluster, which is characterized in that including：Control centre, wind power plant cluster control
Device processed and wind power plant cluster, wherein the wind power plant cluster includes at least two wind power plants and the corresponding substation AVC, described
The substation that at least two wind power plant is collected is arranged in wind power plant cluster control device；
The wind power plant cluster control device includes：Obtain module, detection module and control module；
The acquisition module, the voltage instruction issued for receiving the control centre, and institute is extracted from the voltage instruction
State the target grid entry point voltage of at least two wind power plants；
The detection module, the current grid entry point voltage uploaded for receiving at least two wind power plant, and will be described current
Grid entry point voltage and pre-set interval are compared, and detect the section where the current grid entry point voltage；
The control module, for controlling the wind-powered electricity generation in the case where the current grid entry point voltage is in and operates normally section
The substation AVC of field enters local control model, and issues the target grid entry point voltage to the substation AVC, passes through idle function
The grid entry point voltage that rate compensation controls the wind power plant reaches the target grid entry point voltage；At the current grid entry point voltage
In the case where misoperation section, the substation AVC for controlling the wind power plant enters coordinated control mode, sensitive according to reactive voltage
Degree and the idle variable capacity of each wind power plant select to coordinate the substation AVC in the wind power plant cluster, control coordination AVC
It stands output reactive power, it is grid-connected to assist control in the grid entry point voltage of the wind power plant of coordinated control mode to reach the target
Point voltage；And in the case where the current grid entry point voltage is in urgent operation section, control the substation AVC of the wind power plant
Into emergent control mode, the grid entry point voltage of the wind power plant is controlled by the way of machine of cutting, removal of load or wind cutting field；
The control module includes：
Second control unit, the current grid entry point voltage of the wind power plant for basis in coordinated control mode and the target are simultaneously
The difference of site voltage, calculating the substation coordination AVC needs idle adjustment amount to be offered；It is issued to the substation coordination AVC
The idle coordinated control instruction of the idle adjustment amount is carried, the substation coordination AVC is exported according to the idle adjustment amount
Reactive power makes the grid entry point voltage of the wind power plant in coordinated control mode reach the target grid entry point voltage；Wherein, institute
State after coordinating the substation AVC according to the idle adjustment amount output reactive power, it is described coordinate the corresponding wind power plant in the substation AVC and
Site voltage, which is in, operates normally section.
7. system according to claim 6, which is characterized in that the control module includes：
First control unit, for being calculated using the following equation in the wind power plant cluster all wind power plants in coordinated control
The reactive voltage sensitivity coefficient matrix S of the wind power plant i of mode：
S=- (B ")-1V-1
Wherein, the element S in reactive voltage sensitivity coefficient matrix SijFor wind power plant i grid entry point voltage change to wind power plant j
Grid entry point reactive power change sensitivity coefficient；B " is the admittance matrix of route in the wind power plant cluster, matrix's reversibility；
V=diag (V1,V2,...,Vn) indicate Wind turbines set end voltage, share n node；By reactive voltage sensitivity coefficient matrix
Sensitivity coefficient S in SijAccording to being ranked up from big to small；Wind-powered electricity generation corresponding to the sensitivity coefficient of selected and sorted in front
The substation AVC of field is as the substation coordination AVC.
8. system according to claim 6, which is characterized in that the control module includes：
Third control unit is instructed for issuing Reactive-power control in the substation AVC in emergent control mode in the wind power plant
Wind turbines or reactive-load compensation equipment after, detection reaches deliberate action delay time, and control is in the AVC of emergent control mode
Substation carries out cutting machine, removal of load or wind cutting field, wherein the deliberate action delay time is greater than described in emergent control mode
The substation AVC action cycle, the action cycle is to issue Reactive-power control from the substation AVC in emergent control mode
The time for instructing Wind turbines or reactive-load compensation equipment execution to act；Wherein, if wind farm grid-connected voltage is in pre- timing
The interior peak always above setting, confirmation reactive power compensation planning are used up, and the submitting route of the wind power plant is cut off.
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| CN106786625B (en) * | 2016-12-20 | 2023-10-13 | 国网天津市电力公司 | Power distribution network voltage coordination control method based on distributed energy supply system interaction capability |
| CN108306302B (en) * | 2017-12-20 | 2021-03-16 | 国网北京市电力公司 | Voltage control method and device and storage medium |
| CN109193818A (en) * | 2018-08-31 | 2019-01-11 | 中国电力科学研究院有限公司 | A kind of powerless control method and system of new energy power station |
| CN109599897B (en) * | 2018-12-11 | 2022-09-13 | 宁波市电力设计院有限公司 | Reactive compensation control method considering offshore wind power volatility |
| CN109802435A (en) * | 2019-01-25 | 2019-05-24 | 国网福建省电力有限公司 | A kind of energy storage configuration place selection method of wind power integration system |
| CN110970906B (en) * | 2019-11-05 | 2022-09-20 | 中国电力科学研究院有限公司 | Method and system for coordinated control of reactive voltage of wind power plant |
| CN111740428A (en) * | 2020-06-11 | 2020-10-02 | 浙江运达风电股份有限公司 | Reactive power voltage regulation control method for wind turbine generator cluster |
| CN111668884B (en) * | 2020-06-30 | 2022-10-25 | 国电联合动力技术有限公司 | Iterative learning control method and device for voltage regulation of wind power plant |
| CN117833378B (en) * | 2024-01-09 | 2024-08-20 | 国网江苏省电力有限公司淮安供电分公司 | Wind power plant voltage control method without AVC master station |
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