CN107508318A - A kind of real power control method and system based on voltage sensibility subregion - Google Patents
A kind of real power control method and system based on voltage sensibility subregion Download PDFInfo
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- CN107508318A CN107508318A CN201710756551.4A CN201710756551A CN107508318A CN 107508318 A CN107508318 A CN 107508318A CN 201710756551 A CN201710756551 A CN 201710756551A CN 107508318 A CN107508318 A CN 107508318A
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- H02J3/383—
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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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- 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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
This application provides a kind of real power control method and system based on voltage sensibility subregion, by the cascade that the whole piece feeder line equivalent transformation in distribution network systems is multiple two-port networks, obtain the transmission coefficient matix of compound Two-port netwerk；Based on superposition theorem, voltage sensibility of each photovoltaic user grid entry point to other each photovoltaic user grid entry point photovoltaics outputs is calculated according to the transmission coefficient matix of the compound Two-port netwerk respectively, obtains voltage sensibility matrix；Each photovoltaic user grid entry point on the feeder line is divided into by one or more voltage autonomous control regions according to the voltage sensibility matrix；When feeder voltage is more prescribed a time limit, the voltage sensibility according to each photovoltaic user grid entry point in the voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit calculates the active reduction of each photovoltaic user grid entry point.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of based on the active of voltage sensibility subregion
Control method and system.
Background technology
With global energy, environment, climatic issues it is increasingly serious, Speeding up development is using regenerative resource to promote economy
Development has turned into the whole society and known together.In existing renewable energy power generation technology, photovoltaic power generation technology reaches its maturity and obtained
Extensive use.Distributed photovoltaic access power distribution network brings the problem of new to power network safety operation.When photovoltaic permeability
When higher, reverse trend occurs along feeder line so that access point voltage rises, or even voltage out-of-limit occurs, and this gives the quality of power supply
Very big challenge is brought with power network reliability service.
To solve the voltage problem that distributed photovoltaic accesses power distribution network and brought, it has been proposed that being adopted to grid-connected photovoltaic power generation system
Take appropriate Power Control.The reactive capability of photovoltaic DC-to-AC converter can be utilized, idle work(is controlled according to grid entry point voltage change
Rate；Can also utilize the unnecessary electric energy of energy storage with photovoltaic output low ebb using or directly cut down unnecessary photovoltaic and go out
Power.
However, Reactive Power Control may increase along line current so as to increase network loss, it is also possible to reduce grid entry point power because
Number is so that be unsatisfactory for grid requirements, simultaneously because distribution impedance ratio is big, voltage is poor to reactance susceptibility, only passes through reactive power
Control voltage regulation result limited.Active power controller cuts down photovoltaic power generation quantity due to needing, and reduces the income of photovoltaic generation, and stores up
The cost of energy battery still costly, does not possess large-scale promotion also.Specific control method can take zonal control.Subregion
Method includes the subregion based on interconnection switch, the subregion based on reactive voltage sensitivity, the subregion based on network connection relation, base
In subregion of power flow transfer distribution factor similarity etc..However, these partition methods or lack theoretical calculation foundation, or communication and
It is computationally intensive.
The content of the invention
In view of this, the invention provides a kind of real power control method and system based on voltage sensibility subregion, only
Voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit just carries out active reduction, realizes economy and justice
The unification of property.
In order to realize foregoing invention purpose, concrete technical scheme provided by the invention is as follows：
A kind of real power control method based on voltage sensibility subregion, including：
By the cascade that the whole piece feeder line equivalent transformation in distribution network systems is multiple two-port networks, compound Two-port netwerk is obtained
Transmission coefficient matix；
Based on superposition theorem, it is grid-connected that each photovoltaic user is calculated according to the transmission coefficient matix of the compound Two-port netwerk respectively
The voltage sensibility that point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility matrix；
Each photovoltaic user grid entry point on the feeder line is divided into one according to the voltage sensibility matrix
Or more than one voltage autonomous control region；
When feeder voltage is more prescribed a time limit, according in the voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit
The voltage sensibility of each photovoltaic user grid entry point calculates the active reduction of each photovoltaic user grid entry point.
Preferably, the whole piece feeder line equivalent transformation by distribution network systems is the cascade of multiple two-port networks, is obtained
The transmission coefficient matix of compound Two-port netwerk, including：
It is ball bearing made by distribution network systems equivalent transformation, wherein, each photovoltaic user in the distribution network systems is grid-connected
Point equivalent transformation is current source, is voltage source by each power distribution station equivalent transformation in the distribution network systems, two are terminated with bearing
Every section of feeder line equivalent transformation of lotus is T-shaped circuit；
It is a two-port network by the T-shaped circuit equivalent, then equivalent transformation is multiple two-port networks to whole piece feeder line
Cascade；
Impedance in each two-port network in whole piece feeder line is indicated with T parameters, obtains compound Two-port netwerk
Transmission coefficient matix.
Preferably, it is described to be based on superposition theorem, calculated respectively according to the transmission coefficient matix of the compound Two-port netwerk each
The voltage sensibility that photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility square
Battle array, including：
Based on superposition theorem, by the impedance of each photovoltaic user's grid entry point on the feeder line with the biography of the compound Two-port netwerk
Corresponding T parameters in defeated parameter matrix are indicated, and calculate the impedance of each photovoltaic user's grid entry point on the feeder line；
Each photovoltaic user grid entry point is calculated to it according to the impedance of each photovoltaic user's grid entry point on the feeder line respectively
The voltage sensibility that his each photovoltaic user grid entry point photovoltaic is contributed, obtains voltage sensibility matrix.
Preferably, it is described according to the voltage sensibility matrix by each photovoltaic user grid entry point on the feeder line
One or more voltage autonomous control regions are divided into, including：
By each photovoltaic user grid entry point in the voltage sensibility matrix to other each photovoltaic user grid entry points
The voltage sensibility of output is converted into the voltage sensibility vector of each photovoltaic user grid entry point；
Using the voltage sensibility vector of each photovoltaic user grid entry point as input data, based on default clustering algorithm,
Each photovoltaic user grid entry point is divided into one or more voltage autonomous control regions.
Preferably, described when feeder voltage is more prescribed a time limit, the voltage where photovoltaic user's grid entry point of foundation voltage out-of-limit is certainly
The voltage sensibility for controlling each photovoltaic user grid entry point in control area calculates having for each photovoltaic user grid entry point
Work(reduction, including：
Voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit is defined as target control area；
According to the current voltage value of each photovoltaic user grid entry point in the target control area, the mesh is worked as in calculating
The voltage variety when voltage of each photovoltaic user grid entry point returns to target voltage values in mark control area；
According to the voltage variety and voltage sensibility of each photovoltaic user grid entry point in the target control area,
The active reduction of each photovoltaic user grid entry point in the target control area is calculated respectively.
A kind of real power control system based on voltage sensibility subregion, including：
Equivalent transformation unit, for the level by the whole piece feeder line equivalent transformation in distribution network systems for multiple two-port networks
Connection, obtains the transmission coefficient matix of compound Two-port netwerk；
First computing unit, for based on superposition theorem, being counted respectively according to the transmission coefficient matix of the compound Two-port netwerk
The voltage sensibility that each photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics is calculated, obtains pressure sensitive
Spend matrix；
Division unit, for according to the voltage sensibility matrix that each photovoltaic user on the feeder line is grid-connected
Point is divided into one or more voltage autonomous control regions；
Second computing unit, for more being prescribed a time limit when feeder voltage, according to where photovoltaic user's grid entry point of voltage out-of-limit
It is grid-connected to calculate each photovoltaic user for the voltage sensibility of each photovoltaic user grid entry point in voltage autonomous control region
The active reduction of point.
Preferably, the equivalent transformation unit includes：
First equivalent transformation subelement, for being ball bearing made by distribution network systems equivalent transformation, wherein, by the distribution system
Each photovoltaic user grid entry point equivalent transformation in system is current source, by each power distribution station equivalent transformation in the distribution network systems
It is T-shaped circuit by two every section of feeder line equivalent transformations for being terminated with load for voltage source；
Second equivalent transformation subelement, for being a two-port network by the T-shaped circuit equivalent, whole piece feeder line is then etc.
Effect is transformed to the cascade of multiple two-port networks；
Subelement is obtained, for the impedance in each two-port network in whole piece feeder line to be indicated with T parameters, is obtained
Take the transmission coefficient matix of compound Two-port netwerk.
Preferably, first computing unit includes：
First computation subunit, for based on superposition theorem, by the impedance of each photovoltaic user's grid entry point on the feeder line
It is indicated with the corresponding T parameters in the transmission coefficient matix of the compound Two-port netwerk, calculates each photovoltaic on the feeder line
The impedance of user's grid entry point；
Second computation subunit, it is each for being calculated respectively according to the impedance of each photovoltaic user's grid entry point on the feeder line
The voltage sensibility that photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility square
Battle array.
Preferably, the division unit includes：
Transforming subunit, for each photovoltaic user grid entry point in the voltage sensibility matrix is each to other
The voltage sensibility that photovoltaic user grid entry point is contributed is converted into the voltage sensibility vector of each photovoltaic user grid entry point；
Divide subelement, for using the voltage sensibility vector of each photovoltaic user grid entry point as input data, base
In default clustering algorithm, each photovoltaic user grid entry point is divided into one or more voltage autonomous control regions.
Preferably, second computing unit includes：
Determination subelement, it is defined as the voltage autonomous control region where photovoltaic user's grid entry point by voltage out-of-limit
Target control area；
3rd computation subunit, for according in the target control area each photovoltaic user grid entry point it is current
Magnitude of voltage, calculate when the voltage of each photovoltaic user grid entry point in the target control area returns to target voltage values
Voltage variety；
4th computation subunit, for the voltage according to each photovoltaic user grid entry point in the target control area
Variable quantity and voltage sensibility, the active reduction of each photovoltaic user grid entry point in the target control area is calculated respectively
Amount.
It is as follows relative to prior art, beneficial effects of the present invention：
Real power control method and system provided by the invention based on voltage sensibility subregion, each photovoltaic user is grid-connected
Point equivalent transformation is current source, is T-shaped circuit by two every section of feeder line equivalent transformations for being terminated with load, will be whole in distribution network systems
Bar feeder line equivalent transformation is the cascade of multiple two-port networks.Go out force data without photovoltaic, according to Two-port netwerk T parameters and need to only fold
Reason of reordering can calculate the voltage sensibility that each photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics.
Amount of calculation is reduced relative to existing voltage sensibility computational methods, each photovoltaic user grid entry point is rationally divided accordingly
Area, user similar in voltage sensibility size is divided into an area, so as to specify that control object.When feeder voltage is out-of-limit
When, only the voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit just carries out active reduction in proportion,
Realize the unification of economy and fairness.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of real power control method flow diagram based on voltage sensibility subregion disclosed in the embodiment of the present invention；
Fig. 2 is the model schematic of every section of feeder line disclosed in the embodiment of the present invention；
Fig. 3 is the schematic equivalent circuit after the disclosed single photovoltaic of access of the embodiment of the present invention；
Fig. 4 is the schematic equivalent circuit after two photovoltaics of disclosed access of the embodiment of the present invention；
Fig. 5 is the equivalent circuit signal after disclosed two photovoltaics of access represented based on superposition theorem of the embodiment of the present invention
Figure；
Fig. 6 is another equivalent electric after disclosed two photovoltaics of access represented based on superposition theorem of the embodiment of the present invention
Road schematic diagram；
Fig. 7 is a kind of real power control system architecture signal based on voltage sensibility subregion disclosed in the embodiment of the present invention
Figure；
Fig. 8 is distribution figure disclosed in the embodiment of the present invention；
Fig. 9 is cluster result schematic diagram disclosed in the embodiment of the present invention；
Figure 10 is feeder terminal voltage out-of-limit control effect schematic diagram disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 1, present embodiment discloses a kind of real power control method based on voltage sensibility subregion, specifically include
Following steps：
S101：By the cascade that the whole piece feeder line equivalent transformation in distribution network systems is multiple two-port networks, compound two are obtained
The transmission coefficient matix of port；
Preferably, S101 specific implementation procedure is as follows：
It is ball bearing made by distribution network systems equivalent transformation, wherein, each photovoltaic user in the distribution network systems is grid-connected
Point equivalent transformation is current source, is voltage source by each power distribution station equivalent transformation in the distribution network systems, two are terminated with bearing
Every section of feeder line equivalent transformation of lotus is T-shaped circuit；
It is a two-port network by the T-shaped circuit equivalent, then equivalent transformation is multiple two-port networks to whole piece feeder line
Cascade；
Impedance in each two-port network in whole piece feeder line is indicated with T parameters, obtains compound Two-port netwerk
Transmission coefficient matix.
So that single photovoltaic user grid entry point is connected to unit feeder end as an example, connect in radial distribution unit feeder endpoint node n
When having photovoltaic user's grid entry point
Sn=Pn+jQn (1)
Wherein, SnIt is apparent energy, PnIt is active power, QnIt is reactive power.
Feeder line head end voltage is V0, nominal voltage of a system Vnom.Every section two feeder line for being terminated with load can use T-shaped electricity
Road represents, as shown in Figure 2.
Above-mentioned model can be regarded as a two-port network, can be expressed as with T parameters
Tij,21=Zij1 (4)
Wherein, Tij,11、Tij,12、Tij,21And Tij,22For T parameters, Zij1、Zij2And Zij3For impedance shown in Fig. 2.
Whole piece feeder line is considered as the cascade of several Two-port netwerks, then can obtain the configured transmission square of compound Two-port netwerk
Battle array.
S102：Based on superposition theorem, each photovoltaic is calculated according to the transmission coefficient matix of the compound Two-port netwerk respectively and used
The voltage sensibility that family grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility matrix；
Based on superposition theorem, by the impedance of each photovoltaic user's grid entry point on the feeder line with the biography of the compound Two-port netwerk
Corresponding T parameters in defeated parameter matrix are indicated, and calculate the impedance of each photovoltaic user's grid entry point on the feeder line；
Each photovoltaic user grid entry point is calculated to it according to the impedance of each photovoltaic user's grid entry point on the feeder line respectively
The voltage sensibility that his each photovoltaic user grid entry point photovoltaic is contributed, obtains voltage sensibility matrix.
So that single photovoltaic user grid entry point is connected to unit feeder end in Fig. 3 as an example, in radial distribution unit feeder end segment
Point n is connected to exemplified by photovoltaic user's grid entry point.Using photovoltaic user grid entry point as current source, power distribution station is voltage source, is obtained
Equivalent circuit is as shown in Figure 3.
Z1=T12 (7)
Voltage change caused by photovoltaic user grid entry point is so at node n
Wherein, VnFor the magnitude of voltage of photovoltaic user's grid entry point at node n, V0The voltage exported for photovoltaic user grid entry point,
VnomFor nominal voltage, ReqFor equivalent resistance, XeqFor equivalent reactance.
It can thus be concluded that the voltage sensibility that node n contributes to node n photovoltaics is as follows：
The scene of two photovoltaic accesses, equivalent circuit are as shown in Figure 4.
First consider current source is1, voltage source short circuit, current source open circuit, then circuit is as shown in Figure 5.
Wherein
Sensitivity factor is
Consider further that current source is2, voltage source short circuit, current source open circuit, then circuit is as shown in Figure 6.
Can abbreviation be：
Sensitivity factor is
Each photovoltaic user grid entry point can be distinguished according to superposition theorem during multiple photovoltaic user grid entry point access distributions
Consider.The principle for calculating voltage sensibility is same as above, and will not be repeated here.
S103：Each photovoltaic user grid entry point on the feeder line is divided into according to the voltage sensibility matrix
One or more voltage autonomous control regions；
By each photovoltaic user grid entry point in the voltage sensibility matrix to other each photovoltaic user grid entry points
The voltage sensibility of output is converted into the voltage sensibility vector of each photovoltaic user grid entry point；
Using the voltage sensibility vector of each photovoltaic user grid entry point as input data, based on default clustering algorithm,
Each photovoltaic user grid entry point is divided into one or more voltage autonomous control regions.
It should be noted that the default clustering algorithm is any one existing clustering algorithm, pre-sets cluster and calculate
Weight and parameter in method, using each photovoltaic user grid entry point as sample, the principle for clustering subregion is same voltage autonomous control
The voltage sensibility size of photovoltaic user grid entry point is close to photovoltaic user is simultaneously in different voltage autonomous control regions in region
The voltage sensibility size difference of site is larger.Clustering algorithm can select average distance attached method between group, and distance is surveyed between sample
Degree selection Euclidean distance.
S104：When feeder voltage is more prescribed a time limit, according to the voltage autonomous control where photovoltaic user's grid entry point of voltage out-of-limit
The voltage sensibility of each photovoltaic user grid entry point calculates the active reduction of each photovoltaic user grid entry point in region
Amount.
Preferably, the specific implementation procedures of S104 are as follows：
Voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit is defined as target control area；
According to the current voltage value of each photovoltaic user grid entry point in the target control area, the mesh is worked as in calculating
The voltage variety when voltage of each photovoltaic user grid entry point returns to target voltage values in mark control area；
According to the voltage variety and voltage sensibility of each photovoltaic user grid entry point in the target control area,
The active reduction of each photovoltaic user grid entry point in the target control area is calculated respectively.
Real power control strategy needs to determine the active reduction of photovoltaic in proportion according to the voltage sensibility factor.Feeder voltage
Distribution be along all coefficient results of load and photovoltaic, i.e., lifting of each photovoltaic user grid entry point to feeder voltage
Contribute, but contribution degree is different.To influence the economic well-being of workers and staff of each photovoltaic user due to cutting down photovoltaic active power output, thus in order to
Active reduction is more liberally shared between each photovoltaic user along the line, is analyzed using voltage sensibility matrix, it is first in matrix
Element is sensitivity factor, represents the contribution rate that photovoltaic active power output rises to voltage.The voltage sensibility factor is according to formula (18)
~(21) and (27)~(30) analogy calculate.Voltage variety is shown below at i-th of photovoltaic user's grid entry point.
Sensitivity matrix SVPIn elementRepresent the grid-connected point of j-th of user has work output to i-th
The contribution rate that voltage rises at the individual grid-connected point of user, when using it to represent voltage out-of-limit at the grid-connected point of i-th of user
The active ratio that the grid-connected point of j-th of user should be cut down.
All photovoltaic user grid entry points both participate in active reduction along not being, light only in voltage out-of-limit point region
Volt user's grid entry point is just cut down active, and this is due to that other regions active regulating effects of photovoltaics reduction are limited.It is possible thereby to realize
The unification of economy and fairness.
The real power control method based on voltage sensibility subregion that the present embodiment provides, by each photovoltaic user grid entry point etc.
Effect is transformed to current source, is T-shaped circuit by two every section of feeder line equivalent transformations for being terminated with load, and the whole piece in distribution network systems is presented
Line equivalent transformation is the cascade of multiple two-port networks.Go out force data without photovoltaic, only need to be fixed according to Two-port netwerk T parameters and superposition
Reason can calculate the voltage sensibility that each photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics.Relatively
Amount of calculation is reduced in existing voltage sensibility computational methods, rationalization partition is carried out to each photovoltaic user grid entry point accordingly,
User similar in voltage sensibility size is divided into an area, so as to specify that control object.When feeder voltage is more prescribed a time limit, only
Voltage autonomous control region where having photovoltaic user's grid entry point of voltage out-of-limit just carries out active reduction in proportion, realizes warp
The unification of Ji property and fairness.
Based on a kind of real power control method based on voltage sensibility subregion disclosed in above-described embodiment, referring to Fig. 7, this
A kind of real power control system based on voltage sensibility subregion disclosed in embodiment, including：
Equivalent transformation unit 101, for being multiple two-port networks by the whole piece feeder line equivalent transformation in distribution network systems
Cascade, obtains the transmission coefficient matix of compound Two-port netwerk；
Preferably, the equivalent transformation unit 101 includes：
First equivalent transformation subelement, for being ball bearing made by distribution network systems equivalent transformation, wherein, by the distribution system
Each photovoltaic user grid entry point equivalent transformation in system is current source, by each power distribution station equivalent transformation in the distribution network systems
It is T-shaped circuit by two every section of feeder line equivalent transformations for being terminated with load for voltage source；
Second equivalent transformation subelement, for being a two-port network by the T-shaped circuit equivalent, whole piece feeder line is then etc.
Effect is transformed to the cascade of multiple two-port networks；
Subelement is obtained, for the impedance in each two-port network in whole piece feeder line to be indicated with T parameters, is obtained
Take the transmission coefficient matix of compound Two-port netwerk.
First computing unit 102, for based on superposition theorem, being distinguished according to the transmission coefficient matix of the compound Two-port netwerk
The voltage sensibility that each photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics is calculated, obtains voltage spirit
Sensitive matrix；
Preferably, first computing unit 102 includes：
First computation subunit, for based on superposition theorem, by the impedance of each photovoltaic user's grid entry point on the feeder line
It is indicated with the corresponding T parameters in the transmission coefficient matix of the compound Two-port netwerk, calculates each photovoltaic on the feeder line
The impedance of user's grid entry point；
Second computation subunit, it is each for being calculated respectively according to the impedance of each photovoltaic user's grid entry point on the feeder line
The voltage sensibility that photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility square
Battle array.
Division unit 103, for according to the voltage sensibility matrix by each photovoltaic user on the feeder line
Grid entry point is divided into one or more voltage autonomous control regions；
Preferably, the division unit 103 includes：
Transforming subunit, for each photovoltaic user grid entry point in the voltage sensibility matrix is each to other
The voltage sensibility that photovoltaic user grid entry point is contributed is converted into the voltage sensibility vector of each photovoltaic user grid entry point；
Divide subelement, for using the voltage sensibility vector of each photovoltaic user grid entry point as input data, base
In default clustering algorithm, each photovoltaic user grid entry point is divided into one or more voltage autonomous control regions.
Second computing unit 104, for more being prescribed a time limit when feeder voltage, according to where the photovoltaic user grid entry point of voltage out-of-limit
Voltage autonomous control region in the voltage sensibility of each photovoltaic user grid entry point calculate each photovoltaic user simultaneously
The active reduction of site.
Preferably, second computing unit 104 includes：
Determination subelement, it is defined as the voltage autonomous control region where photovoltaic user's grid entry point by voltage out-of-limit
Target control area；
3rd computation subunit, for according in the target control area each photovoltaic user grid entry point it is current
Magnitude of voltage, calculate when the voltage of each photovoltaic user grid entry point in the target control area returns to target voltage values
Voltage variety；
4th computation subunit, for the voltage according to each photovoltaic user grid entry point in the target control area
Variable quantity and voltage sensibility, the active reduction of each photovoltaic user grid entry point in the target control area is calculated respectively
Amount.
The real power control system based on voltage sensibility subregion that the present embodiment provides, by each photovoltaic user grid entry point etc.
Effect is transformed to current source, is T-shaped circuit by two every section of feeder line equivalent transformations for being terminated with load, and the whole piece in distribution network systems is presented
Line equivalent transformation is the cascade of multiple two-port networks.Go out force data without photovoltaic, only need to be fixed according to Two-port netwerk T parameters and superposition
Reason can calculate the voltage sensibility that each photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics.Relatively
Amount of calculation is reduced in existing voltage sensibility computational methods, rationalization partition is carried out to each photovoltaic user grid entry point accordingly,
User similar in voltage sensibility size is divided into an area, so as to specify that control object.When feeder voltage is more prescribed a time limit, only
Voltage autonomous control region where having photovoltaic user's grid entry point of voltage out-of-limit just carries out active reduction in proportion, realizes warp
The unification of Ji property and fairness.
Below using the distribution case described in Fig. 8, to a kind of based on voltage sensibility subregion disclosed in above-described embodiment
The principle and beneficial effect of real power control method are described in detail, and still, practical application and the guarantor of the present invention should not be limited with this
Protect scope.
Distribution figure as shown in Figure 8, node 1 are the end node of 110/10kV step down sides, and G1~G6 represents six
Photovoltaic user, invested by same photovoltaic operator, capacity 1MVA, minimum change 1kVA.Arrow represents load, is controlling
Constant power load model is can be considered in cycle processed, capacity is 1+j0.1MVA.Feeder line parameter is 0.181 Ω/km, 1.203mH/km.Respectively
Section feed line length (km) is followed successively by 10,5,5,1,1,1,5,2,5,1,3,1,3,2,3.
Method carries out voltage sensibility analysis disclosed in above-described embodiment, as a result as shown in table 1.Wherein, n represents node
Numbering.Wherein, only 1,2,3,4,5,6 be photovoltaic user's grid entry point.
The photovoltaic user's voltage sensibility factor of table 1
Upper table result is considered as sensitivity factor matrix A, then its element aijRepresent photovoltaic j active power outputs to electric at photovoltaic i
The contribution of pressure, i.e., sensitivity of the voltage to photovoltaic j active power outputs at photovoltaic i.Division result is as shown in Figure 7.
From Fig. 9 result, one region of No. 1 photovoltaic self-contained, 2,3, No. 4 photovoltaics form a region, 5, No. 6 photovoltaics
A region is formed, claims its region 1 respectively.For example, when No. 15 node voltages of feeder terminal are out-of-limit need to cut down it is active
When, only cut down photovoltaic in region three in voltage sensibility factor ratio and contribute；When No. 5 node voltages are out-of-limit need to cut down it is active
When, cut down photovoltaic in region two in voltage sensibility factor ratio and contribute.
Above-mentioned model to be built in Simulink to be emulated, voltage is as shown in Figure 10 along certain moment after photovoltaic access,
Every bit is steady-state value in figure.
Compared with above-mentioned active cutting method is carried out as follows with the scattered effect cut down of ratio by measure.The two equally reaches
Figure 10 control effect, photovoltaic active power output reduction is respectively as shown in table 2 and table 3.Wherein, n represents photovoltaic numbering, and x is represented
Active reduction value, unit MW.
Table 2 is based on the active reduction of each photovoltaic of voltage sensibility subregion
Table 3 is based on the active reduction of each photovoltaic of decentralised control
During the active reduction of subregion based on voltage sensibility, each photovoltaic user does not cut down active in region one and region two
Contribute, each photovoltaic user cuts down output 0.240MW in region three, and total reduction is 0.480MW.Reach identical control effect,
When ratio disperses to cut down by measure, each photovoltaic user cuts down output 0.110MW in region one, region two and region three, always cuts
Decrement is 0.660MW.As can be seen here, the partition method based on voltage sensibility can reduce active reduction, realize voltage control
The influence to photovoltaic user's economic well-being of workers and staff is reduced while processed.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
- A kind of 1. real power control method based on voltage sensibility subregion, it is characterised in that including：By the cascade that the whole piece feeder line equivalent transformation in distribution network systems is multiple two-port networks, the transmission of compound Two-port netwerk is obtained Parameter matrix；Based on superposition theorem, each photovoltaic user grid entry point pair is calculated according to the transmission coefficient matix of the compound Two-port netwerk respectively The voltage sensibility that other each photovoltaic user grid entry point photovoltaics are contributed, obtains voltage sensibility matrix；Each photovoltaic user grid entry point on the feeder line is divided into by one or one according to the voltage sensibility matrix Individual above voltage autonomous control region；When feeder voltage is more prescribed a time limit, according to each in the voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit The voltage sensibility of the photovoltaic user grid entry point calculates the active reduction of each photovoltaic user grid entry point.
- 2. real power control method according to claim 1, it is characterised in that described whole piece feeder line by distribution network systems etc. Effect is transformed to the cascade of multiple two-port networks, obtains the transmission coefficient matix of compound Two-port netwerk, including：It is ball bearing made by distribution network systems equivalent transformation, wherein, by each photovoltaic user grid entry point in the distribution network systems etc. Effect is transformed to current source, is voltage source by each power distribution station equivalent transformation in the distribution network systems, load is terminated with by two Every section of feeder line equivalent transformation is T-shaped circuit；Be a two-port network by the T-shaped circuit equivalent, whole piece feeder line then equivalent transformation be multiple two-port networks level Connection；Impedance in each two-port network in whole piece feeder line is indicated with T parameters, obtains the transmission of compound Two-port netwerk Parameter matrix.
- 3. real power control method according to claim 1, it is characterised in that it is described to be based on superposition theorem, according to described multiple The transmission coefficient matix for closing Two-port netwerk calculates each photovoltaic user grid entry point to other each photovoltaic user grid entry point photovoltaics respectively The voltage sensibility of output, voltage sensibility matrix is obtained, including：Based on superposition theorem, the impedance of each photovoltaic user's grid entry point on the feeder line is joined with the transmission of the compound Two-port netwerk Corresponding T parameters in matrix number are indicated, and calculate the impedance of each photovoltaic user's grid entry point on the feeder line；It is every to other that each photovoltaic user grid entry point is calculated according to the impedance of each photovoltaic user's grid entry point on the feeder line respectively The voltage sensibility that individual photovoltaic user grid entry point photovoltaic is contributed, obtains voltage sensibility matrix.
- 4. real power control method according to claim 1, it is characterised in that described to be incited somebody to action according to the voltage sensibility matrix Each photovoltaic user grid entry point on the feeder line is divided into one or more voltage autonomous control regions, including：Each photovoltaic user grid entry point in the voltage sensibility matrix is contributed to other each photovoltaic user grid entry points Voltage sensibility be converted into each photovoltaic user grid entry point voltage sensibility vector；, will be every based on default clustering algorithm using the voltage sensibility vector of each photovoltaic user grid entry point as input data The individual photovoltaic user grid entry point is divided into one or more voltage autonomous control regions.
- 5. real power control method according to claim 1, it is characterised in that described when feeder voltage is more prescribed a time limit, foundation is electric Press the voltage spirit of each photovoltaic user grid entry point in the voltage autonomous control region where out-of-limit photovoltaic user's grid entry point Sensitivity calculates the active reduction of each photovoltaic user grid entry point, including：Voltage autonomous control region where photovoltaic user's grid entry point of voltage out-of-limit is defined as target control area；According to the current voltage value of each photovoltaic user grid entry point in the target control area, the target control is worked as in calculating The voltage variety when voltage of each photovoltaic user grid entry point returns to target voltage values in region processed；According to the voltage variety and voltage sensibility of each photovoltaic user grid entry point in the target control area, difference Calculate the active reduction of each photovoltaic user grid entry point in the target control area.
- A kind of 6. real power control system based on voltage sensibility subregion, it is characterised in that including：Equivalent transformation unit, for the cascade by the whole piece feeder line equivalent transformation in distribution network systems for multiple two-port networks, obtain To the transmission coefficient matix of compound Two-port netwerk；First computing unit, for based on superposition theorem, being calculated respectively often according to the transmission coefficient matix of the compound Two-port netwerk The voltage sensibility that individual photovoltaic user grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility square Battle array；Division unit, for according to the voltage sensibility matrix by each grid-connected dot-dash of photovoltaic user on the feeder line It is divided into one or more voltage autonomous control regions；Second computing unit, for more being prescribed a time limit when feeder voltage, according to the voltage where photovoltaic user's grid entry point of voltage out-of-limit The voltage sensibility of each photovoltaic user grid entry point calculates each photovoltaic user grid entry point in autonomous control region Active reduction.
- 7. real power control system according to claim 6, it is characterised in that the equivalent transformation unit includes：First equivalent transformation subelement, for being ball bearing made by distribution network systems equivalent transformation, wherein, by the distribution network systems Each photovoltaic user grid entry point equivalent transformation be current source, by each power distribution station equivalent transformation in the distribution network systems for electricity Potential source, it is T-shaped circuit by two every section of feeder line equivalent transformations for being terminated with load；Second equivalent transformation subelement, for being a two-port network by the T-shaped circuit equivalent, the then equivalent change of whole piece feeder line It is changed to the cascade of multiple two-port networks；Subelement is obtained, for the impedance in each two-port network in whole piece feeder line to be indicated with T parameters, is obtained multiple Close the transmission coefficient matix of Two-port netwerk.
- 8. real power control system according to claim 6, it is characterised in that first computing unit includes：First computation subunit, for based on superposition theorem, by the impedance of each photovoltaic user's grid entry point on the feeder line with institute The corresponding T parameters stated in the transmission coefficient matix of compound Two-port netwerk are indicated, and calculate each photovoltaic user on the feeder line The impedance of grid entry point；Second computation subunit, for calculating each photovoltaic respectively according to the impedance of each photovoltaic user's grid entry point on the feeder line The voltage sensibility that user's grid entry point is contributed to other each photovoltaic user grid entry point photovoltaics, obtains voltage sensibility matrix.
- 9. real power control system according to claim 6, it is characterised in that the division unit includes：Transforming subunit, for by each photovoltaic user grid entry point in the voltage sensibility matrix to other each photovoltaics The voltage sensibility that user's grid entry point is contributed is converted into the voltage sensibility vector of each photovoltaic user grid entry point；Subelement is divided, for using the voltage sensibility vector of each photovoltaic user grid entry point as input data, based on pre- If clustering algorithm, each photovoltaic user grid entry point is divided into one or more voltage autonomous control regions.
- 10. real power control system according to claim 6, it is characterised in that second computing unit includes：Determination subelement, it is defined as target for the voltage autonomous control region where photovoltaic user's grid entry point by voltage out-of-limit Control area；3rd computation subunit, for the current voltage according to each photovoltaic user grid entry point in the target control area Value, calculates the electricity when the voltage of each photovoltaic user grid entry point in the target control area returns to target voltage values Press variable quantity；4th computation subunit, for the voltage change according to each photovoltaic user grid entry point in the target control area Amount and voltage sensibility, the active reduction of each photovoltaic user grid entry point in the target control area is calculated respectively.
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