CN109617116A - Wind power plant group impedance analysis method, reactive power control method and device and power generation system - Google Patents
Wind power plant group impedance analysis method, reactive power control method and device and power generation system Download PDFInfo
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a wind power plant group impedance analysis method, a reactive power control device and a power generation system. The wind power plant group comprises a plurality of wind power plants, the wind power plants are connected to form a plurality of target control points, the target control points comprise grid connection points and branch points of the wind power plant group, and the wind power plant group impedance analysis method comprises the following steps of: establishing a simulation model of the wind power plant group according to the wind field structure and the wind field parameters of the wind power plant group; determining the current working condition of a target control point according to the current voltage, the current active power and the current reactive power of the target control point of the wind power plant group; determining the system impedance of a target control point and the power flow distribution of a wind power plant group under the current working condition according to the simulation model; and correcting the system impedance according to a small disturbance method and power flow distribution. According to the embodiment of the invention, the measurement error of the system impedance can be reduced, and the control flexibility of each wind turbine generator and the safety and stability of a power grid can be improved when the wind power plant group is subjected to reactive power control.
Description
Technical field
The invention belongs to technical field of wind power more particularly to a kind of wind farm group impedance analysis method and powerless control methods
And device and electricity generation system.
Background technique
In order to meet the growing demand of electric power resource, need to increase the scale of wind power plant.When the scale of wind power plant
After increase, not only large-scale Wind turbines concentrate access electric system that can bring strong influence to the safety and stability of power grid,
The fluctuation of wind farm grid-connected voltage as caused by reactive power fluctuation also will have a direct impact on the safety and stability of power grid.Specifically, with
The capacity of the increase of wind power plant scale, especially wind farm group increases, and the power output of Wind turbines can have certain Space Coupling
Characteristic, so that the fluctuation of the reactive power of wind power plant will bring strong influence to the stable operation of power grid.
According to the regulation of " GB/T 19963-2011 wind power plant access power system technology provides ", Wind turbines access electricity
Force system need to have certain reactive power, and therefore, mainly there are two methods for the idle control of wind power plant, i.e., to each wind turbine
Group carries out controlling in itself and carries out concentration reactive compensation to wind power plant.When controlling each Wind turbines itself, respectively
Free control is carried out to the Wind turbines in wind power plant, then can cause the in-fighting of wind farm group reactive power, be unable to reach wind energy
The preferential target of generating efficiency.And when carrying out concentration reactive compensation to wind power plant, since wind power plant concentrates reactive-load compensation equipment to deposit
In cost height, big and stability difference disadvantage is lost, and concentrates the conformability of reactive-load compensation equipment and Wind turbines poor
Problem can not realize idle control well.
Summary of the invention
In view of above-described one or more problems, the embodiment of the invention provides a kind of wind farm group impedance analysis sides
Method and powerless control method and device and electricity generation system.
On the one hand, the embodiment of the present invention provides a kind of wind farm group impedance analysis method, and wind farm group includes multiple wind-powered electricity generations
Unit, multiple Wind turbines connect to form multiple target control points, and target control point includes the grid entry point and branch of wind farm group
Point, impedance analysis method include:
According to the wind field structure and Wind parameters in wind of wind farm group, the simulation model of wind farm group is established；
According to the current voltage of the target control of wind farm group point, current active power and current reactive power, mesh is determined
Mark the current working at control point；
According to simulation model, the system impedance of target control point and the distribution of the trend of wind farm group under current working are determined；
It is distributed according to linear perturbation theory and trend, update the system impedance.
Further, according to simulation model, the system impedance of target control point and wind farm group under current working are determined
Trend is distributed
It is combined according to the threshold value of multiple groups voltage threshold, active power threshold value and reactive power threshold value, generates target control point
Multiple operating conditions；
The impedance data and wind-powered electricity generation of the system impedance corresponding with multiple operating conditions of target control point are obtained based on simulation model
The flow data of trend corresponding with the multiple operating conditions distribution of field group；
The system impedance corresponding with current working and wind-powered electricity generation of target control point are obtained from impedance data and flow data
Trend corresponding with the current working distribution of field group.
Further, it is distributed according to linear perturbation theory and trend, correcting the system impedance includes:
Based on linear perturbation theory update the system impedance, the amendment impedance of target control point is obtained；
The counter of target control point, which is back-calculated to obtain, according to trend distribution pushes away impedance；
If correcting impedance and the anti-difference for pushing away impedance being less than or equal to predetermined threshold, hindered using amendment impedance more new system
It is anti-；If correcting impedance and the anti-difference for pushing away impedance being greater than predetermined threshold, the system impedance of target control point is reacquired and corrected.
On the other hand, the embodiment of the invention provides a kind of wind farm group powerless control method, powerless control method includes:
Obtain current voltage, current active power and the current reactive power of each target control point；
According to wind farm group impedance analysis method as described above, the system impedance and wind-powered electricity generation of each target control point are determined
The trend distribution of field group；
Dispatching of power netwoks signal is received, and calculates the ideal reactive power of grid entry point based on dispatching of power netwoks signal；
It is distributed according to the trend of ideal reactive power, the system impedance of each target control point and wind farm group, is each
Wind turbines distribute the reactive power that need to be provided or absorb, and are used to indicate Wind turbines to the transmission of each Wind turbines and generate institute
The instruction of the reactive power of distribution.
Further, dispatching of power netwoks signal is received, and calculates the ideal reactive power of grid entry point based on dispatching of power netwoks signal
Include:
The dead zone threshold value of grid entry point is set；
When the current voltage of grid entry point and the absolute value of the difference of dispatching of power netwoks signal are greater than dead zone threshold value, ideal is utilized
The calculation formula of reactive power calculates the ideal reactive power of grid entry point.
Further, it is distributed according to the trend of ideal reactive power, the system impedance at each control point and wind farm group, is
Each Wind turbines distribute the reactive power that need to be provided or absorb
Determine the Reactive Power Margin of reactive-load compensation equipment；
Determining target letter is distributed based on the trend of Reactive Power Margin, the system impedance of each target control point and wind farm group
Number, inequality constraints condition and equality constraint；
Ideal reactive power, objective function, inequality constraints condition and equality constraint are solved, is each Wind turbines
The reactive power that need to be provided or absorb is provided.
Further, objective function includes at least: the minimal network loss of each target control point, minimum voltage deviation,
Minimum Reactive Power Margin deviation and the weighted sum of minimal network loss, minimum voltage deviation and minimum Reactive Power Margin deviation.
Further, inequality constraints condition includes at least: power flow equation inequality constraints condition, the safe inequality of system
The reactive power inequality constraints condition of constraint condition, Wind turbines and reactive-load compensation equipment.
Further, equality constraint includes at least: grid entry point voltage equality constraint and power flow equation equation are about
Beam condition.
Another aspect, the embodiment of the invention provides a kind of wind farm group impedance analysis device, wind farm group includes multiple
Wind turbines, multiple Wind turbines connect to form multiple target control points, target control point include wind farm group grid entry point and
Branch point, comprising:
Model foundation unit establishes the emulation of wind farm group for the wind field structure and Wind parameters in wind according to wind farm group
Model；
Operating condition determination unit, for according to the current voltage of the target control point of wind farm group, current active power and working as
Preceding reactive power determines the current working of target control point；
Emulation processing unit, for determining the system impedance and wind of target control point under current working according to simulation model
The trend of electric field group is distributed；
Correcting process unit, for being distributed according to linear perturbation theory and trend, update the system impedance.
Further, emulation processing unit includes:
Operating condition generation unit, for the sets of threshold values according to multiple groups voltage threshold, active power threshold value and reactive power threshold value
It closes, generates multiple operating conditions of target control point；
Simulation computing unit, for obtaining the system impedance corresponding with multiple operating conditions of target control point based on simulation model
Impedance data and wind farm group trend corresponding with multiple operating conditions distribution flow data；
As a result determination unit, for obtaining the corresponding with current working of target control point from impedance data and flow data
System impedance and wind farm group trend corresponding with current working distribution.
Further, correcting process unit includes:
Corrected Calculation unit obtains the amendment impedance of target control point for being based on the impedance of linear perturbation theory update the system；
System is counter to push away unit, pushes away impedance for being back-calculated to obtain the counter of target control point according to trend distribution；
Decision package is corrected, if for correct impedance and the anti-difference for pushing away impedance less than or equal to predetermined threshold, using repairing
Positive impedance updates system impedance；If correcting impedance and the anti-difference for pushing away impedance being greater than predetermined threshold, reacquires and correct target
The system impedance at control point.
In another aspect, the embodiment of the invention provides a kind of idle control device of wind farm group, wind farm group includes multiple
Wind turbines, multiple Wind turbines connect to form multiple target control points, target control point include wind farm group grid entry point and
Branch point, idle control device include:
Power grid detection module, for obtaining the current voltage of each target control point, current active power and current idle
Power；
Communication interface, for receiving dispatching of power netwoks signal；
Wind farm group impedance analysis device as described above, for using each target control point as target control
Point determines the system impedance at each control point and the trend distribution of wind farm group；
Grid policies module, for calculating the ideal reactive power of grid entry point based on dispatching of power netwoks signal；
Fan control module, for the system impedance and wind farm group according to ideal reactive power, each target control point
Trend distribution, distribute the reactive power that need to provide or absorb for each Wind turbines, and be used for the transmission of each Wind turbines
Indicate that Wind turbines generate the instruction of distributed reactive power.
Further, grid policies module further include:
Power calculation unit is preset with the dead zone threshold value of grid entry point in power calculation unit, for when grid entry point voltage with
When the absolute value of the difference of dispatching of power netwoks signal is greater than dead zone threshold value, grid entry point is calculated using the calculation formula of ideal reactive power
Ideal reactive power.
Further, fan control module includes:
Data acquisition unit, for determining the Reactive Power Margin of reactive-load compensation equipment；
Power distributing unit, for the tide based on Reactive Power Margin, the system impedance of each target control point and wind farm group
Flow distribution determines objective function, inequality constraints condition and equality constraint；And solve ideal reactive power, target letter
Number, inequality constraints condition and equality constraint distribute the reactive power that need to be provided or absorb for each Wind turbines.
In another aspect, the embodiment of the invention provides a kind of electricity generation systems, comprising:
The multiple Wind turbines collected on route are set, and multiple Wind turbines connect to form multiple target control points, mesh
Mark control point includes the grid entry point and branch point of wind farm group；Wherein, branch point accesses low-voltage bus bar, after transformer boosts
High voltage bus is accessed, high voltage bus is connected by grid entry point and sends out route；
According to the above-mentioned idle control device of wind farm group, each Wind turbines, each are separately connected via communication line
The detection device and reactive-load compensation equipment of target control point.
Thus, on the one hand, the wind farm group impedance analysis method and apparatus of the embodiment of the present invention, it can be according to wind farm group
Target control point current voltage, current active power and current reactive power utilize wind farm group simulation model, obtain
The system impedance of target control point and the trend distribution of wind farm group, and can be distributed according to linear perturbation theory and trend, amendment system
System impedance, it can thus be avoided since the system impedance of in-site measurement target control point and the trend distribution of wind farm group may
The larger problem of caused error.
On the other hand, the wind farm group powerless control method and device of the embodiment of the present invention, due to obtaining each mesh
After marking the voltage at control point, active power and reactive power, can voltage based on each target control point, active power and
Reactive power and simulation model obtain the system impedance of each target control point and the trend distribution of wind farm group, and in basis
When dispatching of power netwoks signal calculates ideal reactive power, according to ideal reactive power, the system impedance of each target control point and
The trend distribution of wind farm group that therefore the idle damage of wind farm group entirety can be reduced for Wind turbines distribution reactive power
Consumption and active loss improve the business efficiency of electric field and power grid.
Another aspect, the wind farm group powerless control method and device of the embodiment of the present invention, due to being comprehensive ideal idle
The trend of power, the system impedance of each target control point and wind farm group is distributed to distribute reactive power, therefore, can be abundant
Ground is in view of the Space Coupling characteristic between each target control point in wind farm group, therefore, can be by improving to each
The flexibility of Wind turbines control improves the reasonability of the trend distribution of wind farm group and the security and stability of power grid, avoids out
The oscillation of existing network voltage.
In another aspect, the wind farm group powerless control method and device of the embodiment of the present invention, by being distributed for Wind turbines
Reactive power, control Wind turbines actively issue suitable reactive power, have given full play to the ability of each Wind turbines, can be with
In the case where omitting the equipment such as concentration reactive compensation, it still can control Wind turbines and issue suitable reactive power, significantly
Reduce the utilization rate for concentrating reactive-load compensation equipment, and then improve the security margin of power grid, reduces concentration reactive compensation
The use cost of equipment.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is an exemplary structural schematic diagram of the topological structure of wind farm group；
Fig. 2 is the flow diagram of the existing method that idle control is carried out to branch point；
Fig. 3 is the flow diagram of wind farm group impedance analysis method provided by one embodiment of the present invention；
Fig. 4 is the sub-process figure of one embodiment of the step S330 in Fig. 3；
Fig. 5 is the sub-process figure of one embodiment of the step S340 in Fig. 3；
Fig. 6 is the flow diagram of wind farm group powerless control method provided by one embodiment of the present invention；
Fig. 7 is the sub-process figure of one embodiment of the step S430 in Fig. 6；
Fig. 8 is the sub-process figure of one embodiment of the step S440 in Fig. 6；
Fig. 9 is the structural schematic diagram of the network topology with 6 nodes；
Figure 10 is the structural schematic diagram of the network topology between the node i in the network topology of Fig. 9 and node j；
Figure 11 is the structural schematic diagram of wind farm group impedance analysis device provided by one embodiment of the present invention；
Figure 12 is the structural schematic diagram of the idle control device of wind farm group provided by one embodiment of the present invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, below in conjunction with drawings and the specific embodiments, the present invention is carried out further detailed
Description.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting this hair
It is bright.To those skilled in the art, the present invention can be in the case where not needing some details in these details
Implement.The description of embodiment is preferably managed just for the sake of being provided by showing example of the invention of the invention below
Solution.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
Fig. 1 shows an exemplary structural schematic diagram of the topological structure of wind farm group.As shown in Figure 1, wind farm group
Including five Wind turbines 101,102,103,104,105, Wind turbines 101 access low-voltage bus bar, wind-powered electricity generation by control point C1
Unit 102 accesses low-voltage bus bar by control point C2, and Wind turbines 103,104 access low-voltage bus bar, wind-powered electricity generation by control point C3
Unit 105 accesses low-voltage bus bar by control point C4, and then each low-voltage bus bar accesses high voltage bus after transformer boosts,
High voltage bus sends out route to power grid by control point C0-POC connection.Wherein, an idle benefit is respectively configured in each Wind turbines
Repay equipment (Static Var Generator, SVG).
In order to maintain the safe and stable operation of the corresponding power grid of wind farm group shown in FIG. 1, need to guarantee wind farm group
The stabilization of grid entry point (control point C0-POC) voltage (i.e. the voltage of G sections of buses in figure) in control point.But due to wind power plant
Exist between each branch point (control point C1, C2, C3, C4) in the control point of group and intercouples, it is currently used by right
The control point C1 of wind farm group, C2, C3, C4 individually carry out idle control, to realize the nothing to control point C0-POC indirectly
The powerless control method of power control can not have preferable idle control effect.
Fig. 2 shows the flow diagrams of the existing method that idle control is carried out to branch point.As shown in Fig. 2, at present
The method that idle control is carried out to any of branch point are as follows:
S201, the system impedance for presetting branch point；
S202, the voltage Umeas that each branch point is obtained by communication apparatus or hardware device and acquisition branch point
Voltage control command Uset；
S203, the voltage that each branch point is determined according to the voltage Umeas and voltage control command Uset of each branch point
Whether Umeas gets over line, if more line thens follow the steps S104, if not getting over line thens follow the steps S1/6；
S204, calculating voltage Umeas get over the difference of the voltage control command Uset and voltage Umeas of the branch point of line, obtain
Obtain the target reactive power of the branch point；
S205, the idle order to the branch point is generated according to the target reactive power of the branch point, passes through SVG execution pair
The idle order of the branch point；
S206, blower displacement SVG is idle order.
In the method for control that this is idle, system impedance is obtained not by acquisition or analysis, but user according to
What experience was in advance configured each branch point, since the system impedance of setting may have biggish error with practical, this
So that will affect the idle control to each branch point in subsequent analysis.
In addition, the method for existing idle control, due to carrying out idle control respectively to each branch point, without will be multiple
Branch point comprehensively considers, and therefore, can have following problem:
Since control point C1 is connected with control point C2 into A sections of buses, control point C3 is connected with control point C4 into C sections of buses,
Therefore, it there may be close coupling between control point C1 and control point C2, is also likely to be present between control point C3 and control point C4 strong
Coupling, and it is big to influence each other.When using the current powerless control method to wind farm group to wind farm group shown in FIG. 1 into
When the idle control of row, when carrying out decentralised control to each branch point (control point C1, C2, C3, C4), it is possible that control point
While C3 is from power grid absorbing reactive power, control point C4 can send out reactive power, that is, the nothing of control point C3 and control point C4
There is the phenomenon that liquidates in power control system, cause the waste of the energy, and reduce power grid in the spare reactive power capability of trouble time.Together
Sample, there is also the same problems between control point C1 and control point C2.Moreover, using at present to wind farm group without power control
Method processed also will appear SVG and absorb idle function when wind farm group individually controls grid entry point (control point C0-POC)
The problem of rate, Wind turbines issue reactive power.
More seriously, as automatism voltage control (the Automatic Voltage of control point C3 and control point C4
Control, AVC) system is when respectively controlling control point C3 and control point C4, if the AVC system institute at two control points
The control parameter of setting is just the same, there may be the problem of the voltage oscillation of control point, so as to cause grid entry point (control point
C0-POC) the oscillation of voltage, to jeopardize the safe and stable operation of power grid.
In addition to the method that system impedance rule of thumb is arranged of the prior art of foregoing description, there are also a kind of in the prior art
The acquisition methods of the system impedance of target control point are specially to utilize the voltage of two different moments, active power and idle
Relationship between power is calculated, wherein the relational expression between the voltage of two different moments, active power and reactive power
Are as follows:
According to above-mentioned formula, the calculation formula for system impedance that you can get it are as follows:
Wherein, U1, P1, Q1Respectively indicate voltage, active power and the reactive power at previous moment control point, U2, P2, Q2
Voltage, active power and the reactive power at the later moment in time control point are respectively indicated, X indicates the system impedance at the control point.
Although this method can reduce the error using experience setting system impedance to a certain extent, due to existing
The uncertainty of field test environment still will appear biggish measurement error when power grid fluctuates, to influence subsequent
Idle control.
In order to solve above-mentioned prior art problem, the embodiment of the invention provides a kind of wind farm group impedance analysis methods
With powerless control method and device, electricity generation system.It is provided for the embodiments of the invention wind farm group impedance analysis first below
Method is introduced.
Wind farm group applied by wind farm group impedance analysis method provided by the embodiment of the present invention includes multiple wind-powered electricity generations
Unit, multiple Wind turbines connect to form multiple target control points, and target control point includes the grid entry point and branch of wind farm group
Point, for the convenience of description, the wind farm group described referring to Fig.1 is described in detail.
Fig. 3 shows the flow diagram of wind farm group impedance analysis method provided by one embodiment of the present invention.Such as Fig. 3
Shown, which includes:
S310, wind field structure and Wind parameters in wind according to wind farm group, establish the simulation model of wind farm group；
S320, current voltage, current active power and current reactive power according to the target control point of wind farm group, really
Set the goal the current working at control point；
S330, according to simulation model, determine the trend of the system impedance of target control point and wind farm group under current working
Distribution；
S340, it is distributed according to linear perturbation theory and trend, update the system impedance.
Therefore, the embodiment of the present invention being capable of current voltage according to the target control point of wind farm group, current active power
The simulation model that wind farm group is utilized with current reactive power, obtains the system impedance of target control point and the trend of wind farm group
Distribution, and can be distributed according to linear perturbation theory and trend, update the system impedance, it can thus be avoided due to in-site measurement target
The larger problem of the error that the system impedance at control point and the trend distribution of wind farm group may cause.
In step of embodiment of the present invention S310, it can use the simulation softwares such as PSSE, according to the wind field knot of wind farm group
Structure and Wind parameters in wind establish the simulation model of wind farm group.
In step of embodiment of the present invention S320, the current voltage of available target control point, current active power and
Current reactive power, and it regard the combination of the detected value of current voltage, current active power and current reactive power as current working.
Fig. 4 shows the sub-process figure of one embodiment of the step S330 in Fig. 3.As shown in figure 4, step S330, root
According to simulation model, determine that the system impedance of target control point and the specific method of the trend of wind farm group distribution can under current working
To include:
S331, it is combined according to the threshold value of multiple groups voltage threshold, active power threshold value and reactive power threshold value, generates target control
Make multiple operating conditions of point；
S332, based on simulation model obtain target control point system impedance corresponding with multiple operating conditions impedance data and
The flow data of trend corresponding with the multiple operating conditions distribution of wind farm group；
S333, from impedance data and flow data obtain target control point system impedance corresponding with current working and
The trend corresponding with current working of wind farm group is distributed.
In step of embodiment of the present invention S331, all possible voltage threshold, active power threshold value and nothing can be enumerated
These voltage thresholds, active power threshold value and reactive power threshold value are passed through a variety of possible combination groups by function power threshold
It is combined together, obtains the combination of multiple groups threshold value, the combination of multiple groups threshold value is respectively by different voltage thresholds, active power threshold value and idle
Power threshold generates, and each group of threshold value combination both can be determined that an operating condition, i.e. each group of voltage threshold, active power threshold
Value and reactive power threshold value are an operating condition.
In step of embodiment of the present invention S332, different threshold values can be combined and be input in simulation model, to obtain
The impedance data of the corresponding system impedance of target control point and multiple operating conditions and the tide corresponding with multiple operating conditions of wind farm group
The flow data of flow distribution.
Specifically, can the possible threshold value of whole based on target control point combine target control generated by simulation model
Point system impedance corresponding with multiple operating conditions, and the combination of these threshold values is saved as into a list with corresponding system impedance and is formed
Flow data facilitates the inquiry of the subsequent system impedance to current working.It, can be in addition, the convergence in order to guarantee calculated result
The possible threshold value combination of whole based on target control point by simulation model generate each operating condition trend distribution, and by this
A little threshold value combinations save as a list with the distribution of corresponding trend and form flow data, to increase arithmetic speed, it is ensured that subsequent
The equation of description has solution.
In step of embodiment of the present invention S333, can according to current working for current voltage, current active power
Combine with the detected value of current reactive power, inquired in impedance data and flow data, thus according to different operating conditions and
The corresponding relationship of different system impedances and trend distribution, inquiry obtain the corresponding system impedance of current working and trend distribution.
It should be noted that being by each group voltage threshold, active power threshold value and reactive power in embodiments of the present invention
The actual value of threshold value is as a kind of operating condition, in other embodiments, can also be using different functions to voltage threshold, wattful power
The result that rate threshold value and reactive power threshold value are handled, and arrived treated as a kind of operating condition, meanwhile, it is current determining
When operating condition, identical function processing current voltage, current active power and current reactive power also can use, as long as can
It realizes through current voltage, current active power and the current reactive power of acquisition, the system impedance of emulation can be obtained.
Fig. 5 shows the sub-process figure of one embodiment of the step S340 in Fig. 3.As shown in figure 5, step S340, evidence
Linear perturbation theory and trend distribution, update the system impedance include:
S341, it is based on the impedance of linear perturbation theory update the system, obtains the amendment impedance of target control point；
S342, it is back-calculated to obtain the counter of target control point according to trend distribution and pushes away impedance；
If S343, amendment impedance and the anti-difference for pushing away impedance are less than or equal to predetermined threshold, system is updated using amendment impedance
System impedance；
If S344, amendment impedance and the anti-difference for pushing away impedance are greater than predetermined threshold, reacquire and correct target control point
System impedance.
Since in real work, the reactive power and voltage of target control point can have a small fluctuation in real time, therefore,
In step S341, the amendment impedance at control point can be calculated according to this small fluctuation, i.e., is hindered using linear perturbation theory update the system
It is anti-.Specifically, linear perturbation theory is to calculate being averaged for the system impedance in certain time after detecting the system impedance at control point
Value, using the average value as the method for the amendment impedance at control point.Using linear perturbation theory, the accurate of amendment impedance can be improved
Degree.
The accuracy of system impedance used in calculating in order to further increase subsequent descriptions, in step S342,
The counter of control point can also be back-calculated to obtain using the trend distribution of wind farm group and push away impedance, as reference value.
Then, amendment impedance is pushed away by impedance is compared with counter: in step S343, pushing away impedance with counter if correcting impedance
Difference is less than or equal to predetermined threshold, then system impedance is updated using amendment impedance, using the amendment impedance as subsequent descriptions
The system impedance at control point used in calculating.In step S344, it is somebody's turn to do if amendment impedance and the anti-difference for pushing away impedance are greater than
Predetermined threshold then needs to re-execute the steps all operations of S130 and step S140.
As a result, in embodiments of the present invention, the system impedance and trend minute of each target control point can be accurately obtained
Cloth.Also, it when carrying out the idle control in each period or each different operating conditions, can update under the moment corresponding operating condition
System impedance and trend distribution, avoid the effect for influencing the idle control to wind farm group.
Fig. 6 shows the flow diagram of wind farm group powerless control method provided by one embodiment of the present invention.Such as Fig. 6
Shown, which includes:
S410, current voltage, current active power and the current reactive power for obtaining each target control point；
S420, according to wind farm group impedance analysis method as above, determine the system impedance and wind of each target control point
The trend of electric field group is distributed；
S430, dispatching of power netwoks signal is received, and calculates the ideal reactive power of grid entry point based on dispatching of power netwoks signal；
S440, it is distributed according to the trend of ideal reactive power, the system impedance of each target control point and wind farm group, is
Each Wind turbines distribute the reactive power that need to be provided or absorb, and are used to indicate Wind turbines to the transmission of each Wind turbines and produce
The instruction of raw distributed reactive power.
The embodiment of the present invention is due in current voltage, current active power and the current nothing for obtaining each target control point
It, being capable of current voltage, current active power and current reactive power and emulation based on each target control point after function power
Model obtains the system impedance of each target control point and the trend distribution of wind farm group, and according to dispatching of power netwoks signal meter
When calculating ideal reactive power, according to ideal reactive power, the trend of the system impedance of each target control point and wind farm group
Distribution therefore to reduce reactive loss and the active loss of wind farm group entirety for Wind turbines distribution reactive power, mention
The reasonability of the trend distribution of high wind farm group and the security and stability of power grid, avoid the occurrence of the oscillation of network voltage.
In step of embodiment of the present invention S410, control point C1, the C2 of wind farm group shown in FIG. 1 can be obtained respectively,
The current voltage U and current flow I of C3, C4, C0-POC, and current wattful power is calculated according to current voltage U and current flow I
Rate P and current reactive power Q.In addition to this it is possible to calculate current power factor according to current voltage U and current flow I
Cos。
In the step s 420, it can use the simulation model that the simulation softwares such as PSSE establish wind farm group as shown in Figure 1,
And above-mentioned wind farm group impedance analysis method is utilized, determine the system resistance of each target control point C1, C2, C3, C4, C0-POC
Anti- and wind farm group trend is distributed.
In the acquisition methods of existing system impedance, idle control is only being carried out for the first time to the system impedance at control point
When obtain it is primary, and after obtaining the system impedance, carry out under all operating conditions to idle control relevant calculating when, no
Change the system impedance again, the idle control that this will lead to wind farm group is inaccurate, especially when the operation of wind farm group
When mode changes, actual system impedance changes highly significant, at this point, continuing to bring using fixed system impedance value
Serious control problem.Therefore, in the embodiment of the present invention, by the current voltage of simulation model and each target control point,
Current active power and current reactive power, the reasonable system impedance value under available target control point difference operating condition, with
Avoid the catastrophic fluctuation of the idle control of wind farm group.
In step of embodiment of the present invention S420, the embodiment of the present invention utilizes the thinking of big data, is obtained by simulation model
Obtain the system impedance of each target control point and the trend distribution of wind farm group.It specifically, can be by collected target control
Current voltage U, current active power P and the current reactive power Q of point C1, C2, C3, C4, C0-POC are as current working, then
It is inquired in impedance data and flow data, finds the corresponding system impedance of target control point current working and wind power plant
The corresponding trend distribution of group's current working.
Fig. 7 shows the sub-process figure of one embodiment of the step S430 in Fig. 6.As shown in fig. 7, step S430, connecing
Dispatching of power netwoks signal is received, and includes: based on the specific method that dispatching of power netwoks signal calculates the ideal reactive power of grid entry point
S431, the dead zone threshold value that grid entry point is set；
S432, when the absolute value of the current voltage of grid entry point and the difference of dispatching of power netwoks signal is greater than dead zone threshold value, benefit
The ideal reactive power of grid entry point is calculated with the calculation formula of ideal reactive power.
It, can current voltage, the corresponding voltage control command of dispatching of power netwoks signal according to grid entry point in step S432
With dead zone threshold value, ideal reactive power is determined.
For example, when the voltage Umeas of grid entry point exceeds the dead zone threshold value U of voltage control command UsetdbWhen, voltage Umeas,
Voltage control command Uset and dead zone threshold value UdbRelational expression are as follows:
fabs(Umeas-Uset)>Udb
Ideal reactive power required for grid entry point can be calculated according to above-mentioned formula:
It should be noted that when the current voltage of grid entry point and the absolute value of the difference of dispatching of power netwoks signal are less than or equal to
When the threshold value of dead zone, without distributing the reactive power that need to be provided or absorb again for each Wind turbines.
Fig. 8 shows the sub-process figure of one embodiment of the step S440 in Fig. 6.As shown in figure 8, step S440, root
It is distributed according to the trend of ideal reactive power, the system impedance of each target control point and wind farm group, is each wind turbine component
Specific method with the reactive power that need to be provided or absorb may include:
S441, the Reactive Power Margin for determining reactive-load compensation equipment；
S442, the determining mesh of trend distribution based on Reactive Power Margin, the system impedance of each target control point and wind farm group
Scalar functions, inequality constraints condition and equality constraint；
S443, ideal reactive power, objective function, inequality constraints condition and equality constraint are solved, is each wind
The reactive power that electric unit commitment need to be provided or be absorbed.
In embodiments of the present invention, objective function can specifically include: the minimal network of each target control point is lost, most
Small voltage deviation, minimum Reactive Power Margin deviation and minimal network loss, minimum voltage deviation and minimum Reactive Power Margin deviation plus
Quan He；Inequality constraints condition can specifically include: the safe inequality constraints item of power flow equation inequality constraints condition, system
The reactive power inequality constraints condition of part, Wind turbines and reactive-load compensation equipment；Equality constraint can specifically include: simultaneously
Site voltage equality constraint and power flow equation equality constraint.
In other embodiments, objective function is the minimal network loss of each target control point, minimum voltage deviation, minimum
One or more in Reactive Power Margin deviation and the weighted sum of minimal network loss, minimum voltage deviation and minimum Reactive Power Margin deviation
It is a；Inequality constraints condition can be power flow equation inequality constraints condition, the safe inequality constraints condition of system, Wind turbines
One or more of with the reactive power inequality constraints condition of reactive-load compensation equipment；Equality constraint can be grid entry point
One or more of voltage equality constraint and power flow equation equality constraint.
In the following, according to specific optimal reactive power dispatch algorithm, to the specific method of the step S340 of the embodiment of the present invention into
Row explanation.
OPTIMAL REACTIVE POWER scheduling (ORPD) can be obtained using optimal reactive power dispatch algorithm, ORPD is the core of distribution system operation
One of heart problem, system power dissipation can be effectively reduced, operation risk is reduced, improve power quality etc..But it is original
ORPD is a nondeterministic polynomial problem, it is difficult to direct solution.In this example, it can apply second order cone (SOC) will
The relaxation of ORPD model is convex Second-order cone programming (SOCP) model, is then solved.
In order to simultaneously meet multiple control points (C1C2C3C4) voltage require and other control targets, according to it is each
The system impedance of a target control point and the trend of wind farm group are distributed relevant voltage, reactive power, active power and voltage
With reference to using following optimal reactive power dispatch algorithm:
(1) objective function is chosen.
(i) minimal network loss, (ii) minimum voltage deviation, (iii) minimum Reactive Power Margin deviation, (iv) three above mesh
The minimum weight of scalar functions and.
Specifically:
(i)
(ii)
(iii)
(iv)
Wherein, nBAnd nWFor the quantity of nodes and control point all in wind farm group；Set Φ (i) be power grid in headed by i
The set of end nodes of the branch of end node；rijFor the resistance of branch ij；iijFor the current amplitude of branch ij；uiFor node i
Voltage magnitude；qj,svgFor SVG output reactive power in node i；η1、η2And η3For weight.
(2) the power flow equation constraint condition of radial distribution networks is calculated using DistFlow method.
Fig. 9 shows the structural schematic diagram of the network topology with 6 nodes.In network topology shown in Fig. 8, for section
Point j has following trend constraint equation:
Wherein, p1jAnd q1j、p2jAnd q2jThe respectively active power and reactive power of branch 1j, 2j head end injection；pj3With
qj3、pj4And qj4The respectively active power and reactive power of branch j3, j4 head end injection；pjAnd qjRespectively node j's has only
Workload and load or burden without work；r1jAnd x1j、r2jAnd x2jThe respectively resistance of branch 1j, 2j and reactance.
The equation of the characteristics of according to trend constraint equation, node j can be uniformly written as:
pj=pj,d-pj,w (8)
qj=pj,d-qj,w-qj,svg (10)
Wherein, Ω (j) is in network using j as the headend node set of the branch of endpoint node；In set Φ (j) network with
J is the set of end nodes of the branch of headend node；pijAnd qijThe respectively active power of branch ij head end injection and idle function
Rate；pjAnd qjRespectively the net load active power of node j and reactive power；pj,wAnd pj,dThe wind connected on respectively node j
Motor group active power of output and load active power；qj,w、qj,svgAnd qj,dThe Wind turbines connected on respectively node j are defeated
Reactive power, SVG output reactive power and reactive load power out；uiFor the voltage magnitude of node i；rijAnd xijRespectively branch
The resistance of ij and reactance.
(3) the voltage constraint condition of branch ij in Fig. 9 is calculated.
Figure 10 shows the structural schematic diagram of the network topology between the node i in the network topology of Fig. 9 and node j.Such as
Shown in Figure 10, the voltage constraint equation of branch ij are as follows:
Wherein, UiFor the voltage of node i, UjFor the voltage of node j, ZijFor the impedance between node i and node j, IijFor
Electric current of the node i to node j, SijFor node i to the apparent energy of node j.
Equation (11) both sides modulus square and be unfolded, can obtain:
It is assumed that the relative phase angle difference very little of node i and j, when all close to 0, can obtain:
Wherein, uiAnd ujFor the voltage magnitude of node i and j；rijAnd xijThe respectively resistance of branch ij and reactance.
(4) the grid entry point voltage constraint condition of wind farm group is calculated.
Grid entry point voltage constraint condition are as follows:
Wherein, u0For the corresponding voltage control command of dispatching of power netwoks signal.
(5) computing system security constraints include voltage and current constraint equation.
System security constraints are as follows:
Wherein, ujAnd iijRespectively node j voltage magnitude and branch ij current amplitude；WithRespectively node j electricity
Pressure amplitude value upper lower limit value；WithFor branch ij current amplitude upper lower limit value.
(6) by node j shown in Fig. 9, output/absorbing reactive power of Wind turbines and reactive-load compensation equipment is calculated
Constraint condition.
The reactive power constraint condition of Wind turbines and reactive-load compensation equipment are as follows:
Wherein, qj,wAnd qj,vsgBy Wind turbines and SVG the reactive power output connected on node j；For wind turbine
Group reactive power exports upper limit value；pj,wFor the practical active power output of node j；α be wind power plant normal operation under power because
Element, -0.95~0.95；Upper limit value is exported for SVG reactive power；η is the configuration factor of SVG capacity, generally takes η=0.2.
cj,wFor the installed capacity of connected Wind turbines on node j.But there are Wind turbines and SVG reactive power are different for above-mentioned model
To problem.
Here, slack variable s ∈ { 0,1 } is introduced, above-mentioned model transformation are as follows:
(7) according to SOCP power flow equation is made SOCP relaxation by the characteristics of, can for formula (7), formula (9), formula (15)
It is defined as follows:
Wherein, ViIndicate square of the voltage of any one node i, IijIndicate any two adjacent node i and node j it
Between electric current square, be exactly square from node i to the electric current of node j.Use ViAnd IijInstead of square after, public affairs can be made
Formula becomes linearly, facilitating calculating.
Then above-mentioned model can convert are as follows:
By above-mentioned deformation, a system of linear equations formula is had been changed to using the power flow equation that Distflow method calculates
(27) the secondary equation (30) of-(29) and a form succinctly.
For arbitrarily small nonnegative constant ε >=0, have
Further equivalent variations are done again, and (32) are turned into standard second order cone, can be obtained:
It is proved through document, when the objective function of the embodiment of the present invention is convex function and is stringent increasing function,
The above second order cone relaxation conversion process is stringent accurate in radial distribution networks model.
To sum up, after above-mentioned deformation, original ORPD becomes the problem of solving to following equations:
Objective function: formula (1)-(4)；
Equality constraint: formula (16), formula (27)-(29)；
Inequality constraints condition: formula (17)-(19), formula (21), formula (23), formula (24), formula (33).
The Optimized model being made of above-mentioned formula, if not considering that the reactive-load compensation equipments such as shunt capacitor are that may be present
If discrete control variable, objective function be it is linear, constraint in all equality constraints be it is linear, except formula (33) it
Outer inequality constraints is also linear.But the inequality of the mathematical form of formula (33) is just met for the definition of second order cone, i.e.,
The above problem is a Second-order cone programming problem, has excellent mathematical property.Therefore, above-mentioned formula is solved, it can calibrated
Really the reactive power that need to be provided or absorb is distributed for each Wind turbines.
It should be noted that due to being engineered, the idle of each Wind turbines and SVG is obtained according to objective function
After power, since each Wind turbines and SVG do not receive the direct tune of the AVC system of the grid entry point in target control point directly
Degree, therefore, it is necessary to which idle control command to be respectively issued to the AVC system of each target control point, to make each target control
The AVC system of point receives the idle control command that the AVC system of main grid entry point issues, then the AVC system of each target control point
Idle control command is sent to corresponding Wind turbines again for system or SVG is executed, to realize the idle control to wind farm group.
It should be noted that, although the powerless control method of the embodiment of the present invention be wind farm group according to figure 1 into
Row explanation, but the wind farm group that the embodiment of the present invention can be applied is not limited to this, and can be applied to any with multiple wind
The wind farm group of motor group, while also can be applied to the idle control of single Wind turbines.
Figure 11 shows the structural schematic diagram of wind farm group impedance analysis device provided by one embodiment of the present invention.Such as figure
Shown in 11, which includes:
Model foundation unit 510 establishes the imitative of wind farm group for the wind field structure and Wind parameters in wind according to wind farm group
True mode；
Operating condition determination unit 520, for according to the current voltage of the target control point of wind farm group, current active power and
Current reactive power determines the current working of target control point；
Emulation processing unit 530, for according to simulation model, determine under current working the system impedance of target control point and
The trend of wind farm group is distributed；
Correcting process unit 540, for being distributed according to linear perturbation theory and trend, update the system impedance.
In embodiments of the present invention, emulation processing unit 530 can also include:
Operating condition generation unit 531, for the threshold value according to multiple groups voltage threshold, active power threshold value and reactive power threshold value
Combination generates multiple operating conditions of target control point；
Simulation computing unit 532, for obtaining the system corresponding with multiple operating conditions of target control point based on simulation model
The flow data of trend corresponding with the multiple operating conditions distribution of the impedance data and wind farm group of impedance；
As a result determination unit 533, for from impedance data and flow data obtain target control point and current working
Corresponding system impedance and the distribution of the trend corresponding with current working of wind farm group.
In embodiments of the present invention, correcting process unit 540 can also include:
Corrected Calculation unit 541 obtains the amendment resistance of target control point for being based on the impedance of linear perturbation theory update the system
It is anti-；
System is counter to push away unit 542, pushes away impedance for being back-calculated to obtain the counter of target control point according to trend distribution；
Decision package 543 is corrected, if being less than or equal to predetermined threshold for correcting impedance and the anti-difference for pushing away impedance, is utilized
It corrects impedance and updates system impedance；If correcting impedance and the anti-difference for pushing away impedance being greater than predetermined threshold, reacquires and correct mesh
Mark the system impedance at control point.
Figure 12 shows the structural schematic diagram of the idle control device of wind farm group provided by one embodiment of the present invention.Such as figure
Shown in 12, this is idle, and control device includes:
Power grid detection module 610, for obtaining current voltage, current active power and the current nothing of each target control point
Function power；
Communication interface 620, for receiving dispatching of power netwoks signal；
Above-mentioned wind farm group impedance analysis device 630, for using each target control point as target control point,
Determine the system impedance at each control point and the trend distribution of wind farm group；
Grid policies module 640, for calculating the ideal reactive power of grid entry point based on dispatching of power netwoks signal；
Fan control module 650, for the system impedance and wind power plant according to ideal reactive power, each target control point
The trend distribution of group distributes the reactive power that need to be provided or absorb for each Wind turbines, and sends and use to each Wind turbines
The instruction of distributed reactive power is generated in instruction Wind turbines.
In embodiments of the present invention, grid policies module 640 further include:
Power calculation unit 641 is preset with the dead zone threshold value of grid entry point, for when grid entry point voltage and dispatching of power netwoks signal
The absolute value of difference when being greater than dead zone threshold value, utilize the calculation formula of ideal reactive power to calculate the idle function of ideal of grid entry point
Rate.
In embodiments of the present invention, fan control module 650 includes:
Data acquisition unit 651, for determining the Reactive Power Margin of reactive-load compensation equipment；
Power distributing unit 652, for based on Reactive Power Margin, the system impedance of each target control point and wind farm group
Trend, which is distributed, determines objective function, inequality constraints condition and equality constraint；And solve ideal reactive power, target letter
Number, inequality constraints condition and equality constraint distribute the reactive power that need to be provided or absorb for each Wind turbines.
The embodiment of the invention also provides a kind of wind generator systems, comprising:
The multiple Wind turbines collected on route are set, and multiple Wind turbines connect to form multiple target control points, mesh
Mark control point includes the grid entry point and branch point of wind farm group；Wherein, branch point accesses low-voltage bus bar, after transformer boosts
High voltage bus is accessed, high voltage bus is connected by grid entry point and sends out route；
According to the above-mentioned idle control device of wind farm group, each Wind turbines, each are separately connected via communication line
The detection device and reactive-load compensation equipment of target control point
In conclusion the wind farm group impedance analysis method of the embodiment of the present invention and the cardinal principle of powerless control method
It is the global Voltage-Reactive Power optimal control thinking based on wind farm group, calculates the target (Wind turbines) for needing optimal control,
Simulation analysis is carried out to the different operating conditions of wind farm group in advance by simulation model using big data thinking, solution obtains different works
System impedance and the trend distribution at each control point of wind farm group, hinder so that solving accurate system using linear perturbation theory under condition
Rapid solving that is anti-and being distributed to trend is possibly realized, to realize the idle control of the wind farm group overall situation.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (16)
1. a kind of wind farm group impedance analysis method, the wind farm group includes multiple Wind turbines, the multiple Wind turbines
Connection forms multiple target control points, and the target control point includes the grid entry point and branch point of the wind farm group, feature
It is, the impedance analysis method includes:
According to the wind field structure and Wind parameters in wind of wind farm group, the simulation model of the wind farm group is established；
According to the current voltage of the target control of wind farm group point, current active power and current reactive power, institute is determined
State the current working of target control point；
According to the simulation model, the system impedance of the target control point and the wind farm group under the current working are determined
Trend distribution；
It is distributed according to linear perturbation theory and the trend, corrects the system impedance.
2. impedance analysis method according to claim 1, which is characterized in that according to the simulation model, work as described in determination
The system impedance of the target control point and the trend of the wind farm group, which are distributed, under preceding operating condition includes:
It is combined according to the threshold value of multiple groups voltage threshold, active power threshold value and reactive power threshold value, generates the target control point
Multiple operating conditions；
The impedance number of the system impedance corresponding with the multiple operating condition of the target control point is obtained based on the simulation model
The flow data being distributed according to trend corresponding with the multiple operating condition with the wind farm group；
The system corresponding with the current working of the target control point is obtained from the impedance data and the flow data
The distribution of the trend corresponding with the current working of system impedance and the wind farm group.
3. impedance analysis method according to claim 1, which is characterized in that it is distributed according to linear perturbation theory and the trend,
Correcting the system impedance includes:
The system impedance is corrected based on the linear perturbation theory, obtains the amendment impedance of the target control point；
The counter of target control point, which is back-calculated to obtain, according to trend distribution pushes away impedance；
If the amendment impedance and the anti-difference for pushing away impedance are less than or equal to predetermined threshold, updated using the amendment impedance
The system impedance；If the amendment impedance and the anti-difference for pushing away impedance are greater than the predetermined threshold, reacquire and repair
The system impedance of the just described target control point.
4. a kind of wind farm group powerless control method, which is characterized in that the powerless control method includes:
Obtain current voltage, current active power and the current reactive power of each target control point；
According to wind farm group impedance analysis method as claimed in any one of claims 1-3, each target control is determined
The system impedance of point and the trend distribution of the wind farm group；
Dispatching of power netwoks signal is received, and calculates the ideal reactive power of the grid entry point based on the dispatching of power netwoks signal；
According to the ideal reactive power, the system impedance of each target control point and the trend minute of the wind farm group
Cloth distributes the reactive power that need to be provided or absorb for each Wind turbines, and is used for each Wind turbines transmission
Indicate that the Wind turbines generate the instruction of distributed reactive power.
5. powerless control method according to claim 4, which is characterized in that receive dispatching of power netwoks signal, and based on described
The ideal reactive power that dispatching of power netwoks signal calculates the grid entry point includes:
The dead zone threshold value of the grid entry point is set；
When the current voltage of the grid entry point and the absolute value of the difference of the dispatching of power netwoks signal are greater than the dead zone threshold value,
The ideal reactive power of the grid entry point is calculated using the calculation formula of the ideal reactive power.
6. powerless control method according to claim 4, which is characterized in that according to the ideal reactive power, Ge Gesuo
State the system impedance of target control point and the trend distribution of the wind farm group, need to be provided for each Wind turbines distribution or
The reactive power of absorption includes:
Determine the Reactive Power Margin of reactive-load compensation equipment；
Determination is distributed based on the trend of the Reactive Power Margin, the system impedance of each target control point and the wind farm group
Objective function, inequality constraints condition and equality constraint；
The ideal reactive power, the objective function, the inequality constraints condition and the equality constraint are solved, is
Each Wind turbines distribute the reactive power that need to be provided or absorb.
7. powerless control method according to claim 6, which is characterized in that the objective function includes at least: Ge Gesuo
State minimal network loss, minimum voltage deviation, minimum Reactive Power Margin deviation and the minimal network loss, institute of target control point
State the weighted sum of minimum voltage deviation and the minimum Reactive Power Margin deviation.
8. powerless control method according to claim 6, which is characterized in that the inequality constraints condition includes at least:
The idle function of the safe inequality constraints condition of power flow equation inequality constraints condition, system, Wind turbines and reactive-load compensation equipment
Rate inequality constraints condition.
9. powerless control method according to claim 6, which is characterized in that the equality constraint includes at least: simultaneously
Site voltage equality constraint and power flow equation equality constraint.
10. a kind of wind farm group impedance analysis device, the wind farm group includes multiple Wind turbines, the multiple Wind turbines
Connection forms multiple target control points, and the target control point includes the grid entry point and branch point of the wind farm group, feature
It is, comprising:
Model foundation unit establishes the emulation of the wind farm group for the wind field structure and Wind parameters in wind according to wind farm group
Model；
Operating condition determination unit, for according to the current voltage of the target control point of the wind farm group, current active power and working as
Preceding reactive power determines the current working of the target control point；
Emulation processing unit, the system for determining the target control point under the current working according to the simulation model
The distribution of the trend of impedance and the wind farm group；
Correcting process unit corrects the system impedance for being distributed according to linear perturbation theory and the trend.
11. impedance analysis device according to claim 10, which is characterized in that the emulation processing unit includes:
Operating condition generation unit, it is raw for being combined according to the threshold value of multiple groups voltage threshold, active power threshold value and reactive power threshold value
At multiple operating conditions of the target control point；
Simulation computing unit, for obtaining the corresponding with the multiple operating condition of the target control point based on the simulation model
The flow data of the trend corresponding with the multiple operating condition of the impedance data of system impedance and wind farm group distribution；
As a result determination unit, for obtain the target control point from the impedance data and the flow data with it is described
The corresponding system impedance of current working and the distribution of the trend corresponding with the current working of the wind farm group.
12. impedance analysis device according to claim 10, which is characterized in that the correcting process unit includes:
Corrected Calculation unit obtains repairing for the target control point for correcting the system impedance based on the linear perturbation theory
Positive impedance；
System is counter to push away unit, pushes away impedance for being back-calculated to obtain the counter of target control point according to trend distribution；
Decision package is corrected, if being less than or equal to predetermined threshold, benefit for the amendment impedance and the anti-difference for pushing away impedance
The system impedance is updated with the amendment impedance；If the amendment impedance and the anti-difference for pushing away impedance are greater than described predetermined
Threshold value reacquires and corrects the system impedance of the target control point.
13. a kind of idle control device of wind farm group, the wind farm group includes multiple Wind turbines, the multiple Wind turbines
Connection forms multiple target control points, and the target control point includes the grid entry point and branch point of the wind farm group, feature
It is, the idle control device includes:
Power grid detection module, for obtaining the current voltage of each target control point, current active power and current idle
Power；
Communication interface, for receiving dispatching of power netwoks signal；
Such as the described in any item wind farm group impedance analysis devices of claim 10-12, for determining each control point
System impedance and the distribution of the trend of the wind farm group；
Grid policies module, for calculating the ideal reactive power of the grid entry point based on the dispatching of power netwoks signal；
Fan control module, for according to the ideal reactive power, the system impedance of each target control point and described
The trend of wind farm group is distributed, and distributes the reactive power that need to be provided or absorb for each Wind turbines, and to each described
Wind turbines, which are sent, is used to indicate the instruction that the Wind turbines generate distributed reactive power.
14. idle control device according to claim 13, which is characterized in that the grid policies module further include:
Power calculation unit is preset with the dead zone threshold value of the grid entry point in the power calculation unit, for when described grid-connected
When the absolute value of the difference of point voltage and the dispatching of power netwoks signal is greater than the dead zone threshold value, the ideal reactive power is utilized
Calculation formula calculate the ideal reactive power of the grid entry point.
15. idle control device according to claim 13, which is characterized in that the fan control module includes:
Data acquisition unit, for determining the Reactive Power Margin of reactive-load compensation equipment；
Power distributing unit, for based on the Reactive Power Margin, the system impedance of each target control point and the wind-powered electricity generation
The trend of field group, which is distributed, determines objective function, inequality constraints condition and equality constraint；And the solution ideal is idle
Power, the objective function, the inequality constraints condition and the equality constraint, for each Wind turbines distribution
The reactive power that need to be provided or absorb.
16. a kind of electricity generation system characterized by comprising
The multiple Wind turbines collected on route are set, and the multiple Wind turbines connect to form multiple target control points, institute
State the grid entry point and branch point that target control point includes the wind farm group；Wherein, the branch point accesses low-voltage bus bar, passes through
High voltage bus is accessed after transformer boosting, the high voltage bus is connected by the grid entry point and sends out route；
According to claim 1, the idle control device of wind farm group described in any one of 3-15, be separately connected via communication line
The detection device and reactive-load compensation equipment of each Wind turbines, each target control point.
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