CN106208001A - A kind of fault current limiter mounting design method alleviating sensitive load voltage dip - Google Patents
A kind of fault current limiter mounting design method alleviating sensitive load voltage dip Download PDFInfo
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- CN106208001A CN106208001A CN201610566189.XA CN201610566189A CN106208001A CN 106208001 A CN106208001 A CN 106208001A CN 201610566189 A CN201610566189 A CN 201610566189A CN 106208001 A CN106208001 A CN 106208001A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a kind of fault current limiter mounting design method alleviating sensitive load voltage dip, comprise the following steps: one, sensitive load selects and voltage dip threshold value determines: from the electrical network of fault current limiter to be installed, select to alleviate the sensitive load of voltage dip, then voltage dip threshold value U to selected sensitive loadthreIt is determined；Two, matrix acquisition drops in the busbar voltage of sensitive load access point temporarily: when obtaining electrical network generation three phase short circuit fault, matrix drops in the busbar voltage of sensitive load access point temporarily；Three, sensitive load voltage dip sag exposed areas matrix obtains；Four, sensitive load voltage dip sag exposed areas obtains；Five, fault current limiter installation branch road determines；Six, the fault current limiter reactance value of fault current limiter installation branch road determines.The inventive method step is simple, reasonable in design and realization is convenient, using effect is good, and the reactance value that the fault current limiter in electrical network can be installed branch road and installed fault current limiter carry out simplicity, quickly determine.
Description
Technical field
The invention belongs to line voltage and control technical field, especially relate to a kind of event alleviating sensitive load voltage dip
Barrier current limiter mounting design method.
Background technology
In recent years, along with the use of power electronic equipment increases, power load is more and more sensitive to voltage dip, and voltage is temporary
Fall has become one of most power quality problem of customer complaint.In electrical network, sensitive load is affected the warp caused by voltage dip
Ji loss cannot be estimated especially.Through analyzing, short trouble is the main cause causing voltage dip, how to alleviate sensitive load and is subject to
Impact and harm that voltage dip causes have important practical significance.Fault current limiter is permissible while limiting short-circuit current
Alleviating voltage dip, the determination etc. that therefore can alleviate the fault current limiter of the voltage dip installation site in electrical network and parameter is asked
Topic has important researching value.
Fault current limiter (fault current limiter, be called for short FCL) as a kind of measure of limiting short-circuit current,
What most literature was mainly studied at present is that fault current limiter use is opened near or above the maximum of chopper at maximum short circuit current
How limiting short-circuit current in the case of cutting capacity, and the development aspect of fault current limiter self structure.And study fault limit
Stream device document in terms of improvement and alleviation voltage dip is little, " a kind of novel fault that Zhang Tianfeng, Li Peng and He Zengke deliver
The principle research of demand limiter " literary composition proposes a kind of novel fault current based on integrated gate commutated thyristor IGCT
Current limiter, when simulation analysis fault current limiter is arranged on feeder line, electromotor-main transformer branch road and bus contact line
Current limiting event, demonstrates installation fault current limiter and can effectively improve electrical network busbar voltage during fault and drop problem temporarily.Zhao
" impact that power system transient voltage is fallen by solid-state current limiter " literary composition that Central Plains is delivered proposes utilize manifold type three
Phase solid-state current limiter, has carried out simulation analysis to radial and the ring network two kinds typical electrical network system model situation of breaking down,
The system transient voltage that the application demonstrating solid-state fault current limiter can effectively suppress short trouble to cause drops temporarily.Although it is above-mentioned
Two documents all demonstrate employing fault current limiter can suppress voltage dip, but does not the most discuss in terms of administering voltage dip such as
What chooses the installation site of fault current limiter." fault current limiter is in power system for the document that Liu Kai, Chen Hongkun, Lin Jun etc. deliver
Middle applied research present situation ", " fault current limiter is installation position in power system for the document delivered with Yang Zhiping of Jin Qingren, Chen Hongkun
Put summary " and Hong Jianshan, Guan Yonggang and Xu Guozheng document " selection of fault current limiter installation site and the ginseng in bulk power grid delivered
Number calculates " in, all discuss the infield of fault current limiter, but do not combine improvement voltage dip and discuss, and
Concrete mount scheme and parameter determination scheme are not given yet.
Summary of the invention
The technical problem to be solved is for above-mentioned deficiency of the prior art, it is provided that a kind of alleviation sensitivity
The fault current limiter mounting design method that load voltage drops temporarily, its method step is simple, reasonable in design and realizes convenient, use effect
The best, the reactance value that the fault current limiter in electrical network can be installed branch road and installed fault current limiter carries out easy, the most true
Fixed.
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of alleviate sensitive load voltage dip
Fault current limiter mounting design method, it is characterised in that the method comprises the following steps:
Step one, sensitive load select and voltage dip threshold value determines: select from the electrical network of fault current limiter to be installed
The sensitive load of voltage dip, then voltage dip threshold value U to selected sensitive load need to be alleviatedthreIt is determined；
Step 2, the busbar voltage of sensitive load access point drop matrix temporarily and obtain: each mother of electrical network described in obtaining step one
During line generation three phase short circuit fault, matrix drops in the busbar voltage of sensitive load access point temporarilyWherein, i is just
Integer and i=1,2 ..., n, n is the bus total quantity in described electrical network, and i is the numbering of described electrical network median generatrix；Described sensitivity
Load access point is sensitive load access bus in described electrical network selected in step one, and j is that selected sensitive load exists
Accessing the numbering of bus in described electrical network, j is positive integer and 1≤j≤n；uijRepresent the bus generation three-phase shortcircuit event of numbered i
The three-phase voltage sag value of the bus of numbered j during barrier；
Step 3, sensitive load voltage dip sag exposed areas matrix obtain: according to sensitive load access point described in step 2
Busbar voltage matrix U drops temporarilyj, and voltage dip threshold value U described in integrating step onethre, obtain the electricity of selected sensitive load
Pressure fall sag exposed areas matrix temporarilyWherein, xij=0 or 1；To xijValue when being determined, work as uijIn at least
One phase voltage sag value is less than UthreTime, xij=1；Otherwise, xij=0；xij=1 bus generation three-phase shortcircuit representing numbered i
The bus generation voltage dip of numbered j during fault；
Step 4, sensitive load voltage dip sag exposed areas obtain: temporary according to the voltage of sensitive load selected in step 3
Fall sag exposed areas matrix Xj, obtain the voltage dip sag exposed areas of selected sensitive load；
Described voltage dip sag exposed areas is the fault bus set of selected sensitive load, wraps in described fault bus set
Include all fault bus of sensitive load selected in described electrical network；The quantity of fault bus described in described fault bus set
Being denoted as N, wherein N is positive integer, 1≤N≤n；
When judging the fault bus whether bus of numbered i is selected sensitive load, according to selected sensitive load
Voltage dip sag exposed areas matrix XjIn xijJudge, and work as xijWhen=1, it is judged that the bus for numbered i is selected
The fault bus of sensitive load；
Step 5, fault current limiter are installed branch road and are determined: be associated each branch road of electrical network described in step one respectively
Property judge, and according to relatedness judged result, find out the relative branch of all fault bus in described voltage dip sag exposed areas；
Wherein, to when described in step one, electrical network any one described being associated property of branch road judges, comprise the following steps:
Step 501, according to voltage dip sag exposed areas described in step 4, obtain on current institute judgement branch road installation reactance value
For X0Fault current limiter after the busbar voltage of described sensitive load access point matrix drops temporarilyWherein, h is
Positive integer and h=1,2 ..., N, h is the numbering of fault bus in described voltage dip sag exposed areas；u'hjRepresent and currently judged
Installing reactance value on branch road is X0Fault current limiter after the fault bus generation three phase short circuit fault of numbered h time numbered j
The three-phase voltage sag value of bus；Wherein, X0By on current institute judgement branch road the reactance limit value of installation fault current limiter
And X0For per unit value, X0=8～12；
Step 502, busbar voltage described in step 501 is dropped temporarily matrix U 'jIn each data carry out threshold decision respectively,
And according to threshold decision result, current institute is judged, and whether branch road is that relative branch judges: when judging to draw described bus
Voltage dip matrix U 'jIn all data be below UthreTime, it is judged that it is dereferenced branch road for current institute judgement branch road；Otherwise,
It is judged as that current institute judgement branch road is relative branch, and the reactance limit value of fault current limiter installed on this relative branch is entered
Row record；On this relative branch, the reactance limit value of installed fault current limiter is institute on current institute judgement branch road in step 501
Reactance limit value X of fault current limiter is installed0；
Wherein, described busbar voltage is dropped temporarily matrix U 'jIn u'hjWhen carrying out threshold decision, by u'hjWith UthreDiffer from
Value compares: work as u'hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u'hjLess than Uthre；Otherwise, it is judged that for currently
Institute's judgement branch road is the relative branch of the fault bus of numbered h；
Step 503, according to the method described in step 501 to step 502, the described branch road of the next one of described electrical network is entered
Row relatedness judges；
Step 504, step 503 is repeated several times, until the pass of all fault bus in finding out described voltage dip sag exposed areas
Connection branch road；
The all relative branches found out in step 504 are fault current limiter and install branch road, and described fault current limiter is installed
Branch road is the branch road needing to install fault stop in described electrical network；
Step 6, fault current limiter are installed the fault current limiter reactance value of branch road and are determined: to faulty limit in step 5
Stream device is installed the reactance value of installed fault stop on branch road and is determined respectively；
Wherein, fault current limiter any one described is installed the reactance value X of installed fault stop on branch roaddCarry out really
Regularly, use two way classification to reactance value XdIt is determined；Xd∈[0,X0d], X0dInstall by this fault current limiter and installed on branch road
The reactance limit value of fault current limiter, X0dFor per unit value and X0d=8～12.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step 502
In be judged as the relative branch of fault bus that current institute judgement branch road is numbered h after, also need voltage described in step 4
In fall sag exposed areas, the fault bus of numbered h is labeled as finding the fault bus of relative branch temporarily, and record number is the event of h
Barrier bus is the bus of current institute judgement branch road association.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step one
Selected in sensitive load be in described electrical network because of voltage changes or suddenly change will cause cisco unity malfunction or
The load of function reduction, voltage dip threshold value U of selected sensitive loadthreFor making selected sensitive load cisco unity malfunction
Time or the temporary depreciation of maximum voltage during function reduction.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step 5
In carry out fault current limiter and install before branch road determines, first according to the how far apart from described sensitive load access point to described
All branch roads of electrical network carry out layering and divide, and are from top to bottom respectively divided by all branch roads of described electrical network to multiple branch roads and divide
In Ceng；
Wherein, according to the how far apart from described sensitive load access point, all branch roads of described electrical network are layered
During division, process is as follows:
Step A1, the first branch road layering divide: by all branch roads that end points in described electrical network is the bus of numbering j, divide
To the first branch road layering；
Step A2, next branch road layering divide: will be connected with each branch road in upper branch road layering in described electrical network
All branch roads, be divided to the layering of next branch road；
Step A3, one or many repeat step A2, until completing the layering partition process of all branch roads in described electrical network；
In step 5 to each branch road of described electrical network being associated property judges respectively time, process is as follows:
Step B1, the first branch road layering relatedness judge: close each branch road in described first branch road layering respectively
Connection property judges；
After any one described being associated property of branch road in described first branch road layering is judged, all to the most described voltage
In fall sag exposed areas, all fault bus the most all find relative branch to judge temporarily: when in the most described voltage dip sag exposed areas
When all fault bus all find relative branch, complete fault current limiter installation branch road and determine process, and the described voltage found out
In fall sag exposed areas, the relative branch of all fault bus is fault current limiter and installs branch road temporarily；Otherwise, to described first branch road
The next one being associated property of described branch road in layering judges；Further, the completeest when all branch roads in described first branch road layering
When becoming relatedness judgement and described voltage dip sag exposed areas at least one described fault bus of interior existence not to find relative branch, enter
Enter step B2；
Step B2, next branch road layering relatedness judge: close each branch road in next branch road layering respectively
Connection property judges；
After any one described being associated property of branch road in described next branch road layering is judged, all to the most described electricity
In pressure fall sag exposed areas temporarily, all fault bus the most all find relative branch to judge: when the most described voltage dip sag exposed areas
When interior all fault bus all find relative branch, complete fault current limiter installation branch road and determine process, and the described electricity found out
In pressure fall sag exposed areas temporarily, the relative branch of all fault bus is fault current limiter and installs branch road；Otherwise, to the described next one
The next one being associated property of described branch road in branch road layering judges；Further, as all in described next branch road layering
Road all completes relatedness and judges and there is at least one described fault bus in described voltage dip sag exposed areas not find association
Lu Shi, enters step B3；
Step B3, one or many repeat step B2, until finding out all fault bus in described voltage dip sag exposed areas
Relative branch, complete fault current limiter install branch road determine process, and the described voltage dip sag exposed areas found out in all therefore
The relative branch of barrier bus is fault current limiter and installs branch road.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step 2
Matrix U drops in middle acquisition described busbar voltage temporarilyjWith step 501 obtains described busbar voltage drop temporarily matrix U 'jTime, all use event
Barrier point method is determined.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step 6
Middle employing two way classification is to reactance value XdWhen being determined, degree of accuracy ε is per unit value and ε=0.001～0.1.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step 6
Middle employing two way classification is to reactance value XdWhen being determined, comprise the following steps:
Step 601, for the first time value and checking, process is as follows:
Step 6011, determine this interval [a, b], wherein a=0, b=X0d；
Step 6012, seek the midpoint c of interval described in step 6011 [a, b]；Wherein,And the number to M
Value is updated, and makes M=c；Wherein, M is that currently determined fault current limiter installs the reactance installing fault current limiter on branch road
Value and M are perunit value；
Step 6013, a1And b1Determine: first according to voltage dip sag exposed areas described in step 4, obtain currently determined event
Barrier current limiter is installed the busbar voltage of described sensitive load access point after installing the fault stop that reactance value is M on branch road and is dropped temporarily
MatrixWherein, u "hjRepresent currently determined fault current limiter to install on branch road installing reactance value is M's
The three-phase voltage sag value of the bus of numbered j during the fault bus generation three phase short circuit fault of numbered h after fault stop,
u”hjFor described busbar voltage, matrix U drops temporarily "jIn data corresponding to the bus of numbered h；Again square is dropped in described busbar voltage temporarily
Battle array U "jIn currently determined fault current limiter the data corresponding to each bus of branch road association be installed carry out threshold decision respectively, and
According to threshold decision result, to a1And b1It is determined respectively: when judging to show that matrix U drops in described busbar voltage temporarily "jIn current
The data that all buses of determined fault current limiter installation branch road association are corresponding are all not less than UthreTime, a1=a, b1=M；No
Then, a1=M, b1=b；
Wherein, matrix U is dropped in described busbar voltage temporarily "jIn u "hjWhen carrying out threshold decision, by u "hjWith UthreDiffer from
Value compares: work as u "hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u "hjLess than Uthre；Otherwise, it is judged that for u "hjNo
Less than Uthre；
Step 6014, this value and the result obtain: this acquired value and the result include step
M described in the 6012 and a described in step 60131And b1；
Step 602, next time value and checking, process is as follows:
Step 6021, determine this interval [a, b]: according to a in last value and the result1And b1, to this
A and b in secondary interval [a, b] is determined respectively, and is updated the value of a and b respectively；Wherein, a=a1, b=
b1；
Step 6022, seek the midpoint c' of interval described in step 6021 [a, b]；Wherein,And make M
=c', is updated the numerical value of M；
Step 6023, elder generation, according to voltage dip sag exposed areas described in step 4, obtain currently determined fault current limiter peace
After installing, on dress branch road, the fault stop that reactance value is M, matrix drops in the busbar voltage of described sensitive load access point temporarilyWherein, u " 'hjRepresent currently determined fault current limiter to install on branch road installing reactance value is the event of M
The three-phase voltage sag value of the bus of numbered j during the fault bus generation three phase short circuit fault of numbered h after barrier stop,
u”hjFor described busbar voltage, matrix U drops temporarily " 'jIn data corresponding to the bus of numbered h；Again square is dropped in described busbar voltage temporarily
Battle array U " 'jIn currently determined fault current limiter the data corresponding to each bus of branch road association be installed carry out threshold decision respectively, and
According to threshold decision result, to a1And b1It is determined respectively: when judging to show that matrix U drops in described busbar voltage temporarily " 'jIn current
The data that all buses of determined fault current limiter installation branch road association are corresponding are all not less than UthreTime, a1=a, b1=M；No
Then, a1=M, b1=b；
Wherein, matrix U is dropped in described busbar voltage temporarily " 'jIn u " 'hjWhen carrying out threshold decision, by u " 'hjWith UthreEnter
Row difference comparsion: work as u " 'hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u " 'hjLess than Uthre；Otherwise, it is judged that
For u " 'hjIt is not less than Uthre；
Step 6024, general | a1-b1| carry out difference comparsion with degree of accuracy ε: when | a1-b1| during ＜ ε, complete reactance value XdReally
Determine process and Xd=M；Otherwise, step 6025 is entered；
Step 6025, this value and the result obtain: this acquired value and the result include step
M described in the 6022 and a described in step 60231And b1；Afterwards, step 602 is returned.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step one
In voltage dip threshold value U to selected sensitive loadthreAfter being determined, use the parameter being connected with data handling equipment defeated
Enter unit, to voltage dip threshold value UthreIt is set；
Matrix U drops in busbar voltage temporarily that obtain described sensitive load access point in step 2jAfter, by acquired bus electricity
Matrix U drops in pressure temporarilyjSynchronize to store to the data storage cell being connected with described data handling equipment；
When step 3 carries out the acquisition of sensitive load voltage dip sag exposed areas matrix, described data handling equipment is used to obtain
The voltage dip sag exposed areas matrix X of selected sensitive loadj, and by acquired voltage dip sag exposed areas matrix XjSynchronize storage
To described data storage cell；
When step 4 carries out the acquisition of sensitive load voltage dip sag exposed areas, described data handling equipment is used to obtain selected
Select the voltage dip sag exposed areas of sensitive load, and synchronize acquired voltage dip sag exposed areas to store to described data storage list
In unit；
Step 5 carries out fault current limiter and branch road is installed when determining, use described data handling equipment to institute in step one
Each branch road the being associated property respectively stating electrical network judges, and uses described data handling equipment to described in finding out in step 504
In voltage dip sag exposed areas, the relative branch of all fault bus carries out synchronous recording；
Step 6 carries out fault current limiter and the fault current limiter reactance value of branch road is installed when determining, use at described data
All fault current limiters in step 5 are installed the reactance value of installed fault stop on branch road and are determined respectively by reason equipment,
And to determined by all fault current limiters the reactance value of installed fault stop on branch road be installed carry out synchronous recording.
A kind of above-mentioned fault current limiter mounting design method alleviating sensitive load voltage dip, is characterized in that: step one
Described in voltage dip threshold value UthreFor per unit value and Uthre=0.7～0.9.
The present invention compared with prior art has the advantage that
1, method step is simple, reasonable in design and realizes conveniently, and input cost is relatively low.
2, fault position method is used to drop matrix for busbar voltage temporarily and obtain, simple and using effect good.
3, using effect is good and practical value high, it is first determined bus generation three-phase fault causes sensitive load access point to send out
The sag exposed areas (i.e. sensitive load voltage dip sag exposed areas) of raw voltage dip, according to the how far of distance sensitive load access point
All branch roads of electrical network are carried out layering division, the relatedness of the bus in sag exposed areas with branch road is judged, to choose pass
Connection branch road as install fault current limiter principle as install fault current limiter principle, the peace of each bus in obtaining sag exposed areas
Dress set of fingers, and use two way classification to calculate the reactance value of fault current limiter；Finally, the installation of the whole network fault current limiter is determined
Branch road and reactance value.During practical operation, by each bus of electrical network is arranged three phase short circuit fault, in conjunction with selected sensitive load
Voltage dip threshold values, determine the voltage dip sag exposed areas of sensitive load access point, and determine the association of bus in sag exposed areas
Fault current limiter installed by branch road.Owing to fault current limiter can alleviate voltage dip, the present invention while limiting short-circuit current
Propose a kind of simplicity, the quick and easily operated installation site to fault current limiter (i.e. according to branch road) and current-limiting reactor value to enter
The method that row determines, can effectively alleviate the voltage dip of sensitive load.Thus, present invention utilizes fault current limiter in normal fortune
Do not change system impedance during row, increase system impedance during short circuit, be possible not only to limiting short-circuit current, it is also possible to alleviate voltage dip
Feature, it is proposed that a kind of method alleviating sensitive load voltage dip, the improvement for voltage dip provides easy, effectively solves
Certainly scheme, and start with from the voltage dip administering sensitive load, determine installation branch road and the reactance value of fault current limiter.And
And, in order to alleviate the voltage dip that short trouble causes, following principle is followed in the formulation of fault current limiter installation site scheme:
Meet certain current limitation effect and alleviate voltage dip effect significantly in the case of, the current limiter number of installation is the fewest, limit
Stream reactance value is the least, thus the application effect highly significant of the present invention.
In sum, the inventive method step is simple, reasonable in design and realization is convenient, using effect is good, can be in electrical network
Fault current limiter the reactance value of branch road and installed fault current limiter is installed carries out simplicity, quickly determine.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the method flow block diagram of the present invention.
Fig. 1-1 is the circuit theory diagrams of fault current limiter.
Fig. 1-2 is to install the mains-power circuit schematic diagram before fault current limiter.
Fig. 1-3 is to install the mains-power circuit schematic diagram after fault current limiter.
Fig. 2 is the electric network model schematic diagram of electrical network of the present invention.
Fig. 3 is the method for operation schematic diagram of electrical network of the present invention.
Detailed description of the invention
A kind of fault current limiter mounting design method alleviating sensitive load voltage dip as shown in Figure 1, including following
Step:
Step one, sensitive load select and voltage dip threshold value determines: select from the electrical network of fault current limiter to be installed
The sensitive load of voltage dip, then voltage dip threshold value U to selected sensitive load need to be alleviatedthreIt is determined；
Selected in step one, the quantity of sensitive load is one；
Step 2, the busbar voltage of sensitive load access point drop matrix temporarily and obtain: each mother of electrical network described in obtaining step one
During line generation three phase short circuit fault, matrix drops in the busbar voltage of sensitive load access point temporarilyWherein, i is just
Integer and i=1,2 ..., n, n is the bus total quantity in described electrical network, and i is the numbering of described electrical network median generatrix；Described sensitivity
Load access point is sensitive load access bus in described electrical network selected in step one, and j is that selected sensitive load exists
Accessing the numbering of bus in described electrical network, j is positive integer and 1≤j≤n；uijRepresent the bus generation three-phase shortcircuit event of numbered i
The three-phase voltage sag value of the bus of numbered j during barrier；
Step 3, sensitive load voltage dip sag exposed areas matrix obtain: according to sensitive load access point described in step 2
Busbar voltage matrix U drops temporarilyj, and voltage dip threshold value U described in integrating step onethre, obtain the electricity of selected sensitive load
Pressure fall sag exposed areas matrix temporarilyWherein, xij=0 or 1；To xijValue when being determined, work as uijIn at least
One phase voltage sag value is less than UthreTime, xij=1；Otherwise, xij=0；xij=1 bus generation three-phase shortcircuit representing numbered i
The bus generation voltage dip of numbered j during fault；
Step 4, sensitive load voltage dip sag exposed areas obtain: temporary according to the voltage of sensitive load selected in step 3
Fall sag exposed areas matrix Xj, obtain the voltage dip sag exposed areas of selected sensitive load；
Described voltage dip sag exposed areas is the fault bus set of selected sensitive load, wraps in described fault bus set
Include all fault bus of sensitive load selected in described electrical network；The quantity of fault bus described in described fault bus set
Being denoted as N, wherein N is positive integer, 1≤N≤n；
When judging the fault bus whether bus of numbered i is selected sensitive load, according to selected sensitive load
Voltage dip sag exposed areas matrix XjIn xijJudge, and work as xijWhen=1, it is judged that the bus for numbered i is selected
The fault bus of sensitive load；
Step 5, fault current limiter are installed branch road and are determined: be associated each branch road of electrical network described in step one respectively
Property judge, and according to relatedness judged result, find out the relative branch of all fault bus in described voltage dip sag exposed areas；
Wherein, to when described in step one, electrical network any one described being associated property of branch road judges, comprise the following steps:
Step 501, according to voltage dip sag exposed areas described in step 4, obtain on current institute judgement branch road installation reactance value
For X0Fault current limiter after the busbar voltage of described sensitive load access point matrix drops temporarilyWherein, h is
Positive integer and h=1,2 ..., N, h is the numbering of fault bus in described voltage dip sag exposed areas；u'hjRepresent and currently judged
Installing reactance value on branch road is X0Fault current limiter after the fault bus generation three phase short circuit fault of numbered h time numbered j
The three-phase voltage sag value of bus；Wherein, X0By on current institute judgement branch road the reactance limit value of installation fault current limiter
And X0For per unit value, X0=8～12；
Step 502, busbar voltage described in step 501 is dropped temporarily matrix U 'jIn each data carry out threshold decision respectively,
And according to threshold decision result, current institute is judged, and whether branch road is that relative branch judges: when judging to draw described bus
Voltage dip matrix U 'jIn all data be below UthreTime, it is judged that it is dereferenced branch road for current institute judgement branch road；Otherwise,
It is judged as that current institute judgement branch road is relative branch, and the reactance limit value of fault current limiter installed on this relative branch is entered
Row record；On this relative branch, the reactance limit value of installed fault current limiter is institute on current institute judgement branch road in step 501
Reactance limit value X of fault current limiter is installed0；
Wherein, described busbar voltage is dropped temporarily matrix U 'jIn u'hjWhen carrying out threshold decision, by u'hjWith UthreDiffer from
Value compares: work as u'hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u'hjLess than Uthre；Otherwise, it is judged that for currently
Institute's judgement branch road is the relative branch of the fault bus of numbered h；
Step 503, according to the method described in step 501 to step 502, the described branch road of the next one of described electrical network is entered
Row relatedness judges；
Step 504, step 503 is repeated several times, until the pass of all fault bus in finding out described voltage dip sag exposed areas
Connection branch road；
The all relative branches found out in step 504 are fault current limiter and install branch road, and described fault current limiter is installed
Branch road is the branch road needing to install fault stop in described electrical network；
Step 6, fault current limiter are installed the fault current limiter reactance value of branch road and are determined: to faulty limit in step 5
Stream device is installed the reactance value of installed fault stop on branch road and is determined respectively；
Wherein, fault current limiter any one described is installed the reactance value X of installed fault stop on branch roaddCarry out really
Regularly, use two way classification to reactance value XdIt is determined；Xd∈[0,X0d], X0dInstall by this fault current limiter and installed on branch road
The reactance limit value of fault current limiter, X0dFor per unit value and X0d=8～12.
Can be found out to step 4 by step 2: the voltage dip sag exposed areas of selected sensitive load is determined
Time, according to described sensitive load access point (i.e. selected sensitive load PCC point in described electrical network) and voltage dip threshold values
UthreIt is determined.
The busbar voltage of sensitive load access point when obtaining described electrical network each bus generation three phase short circuit fault in step 2
Matrix U drops temporarilyjTime, all buses in described electrical network need to be respectively provided with three phase short circuit fault, and calculate each bus generation three
The three-phase voltage sag value of the bus of numbered j during phase short trouble, thus matrix U drops in busbar voltage temporarily that set upjFor instead
The voltage dip matrix of sensitive load access point when reflecting the whole network bus generation three phase short circuit fault.Wherein, three phase short circuit fault
Refer in bus that three phase lines are all short-circuited fault.
All fault current limiters determined by step 5 install each fault current limiter determined by branch road and step 6
The reactance value composition fault current limiter mount scheme of installed fault stop on branch road, described fault current limiter installation side are installed
Case includes installation site (i.e. fault current limiter installation branch road) and the reactance value of fault current limiter.Afterwards, according to described fault
Current limiter mount scheme, each fault current limiter in described electrical network is installed and is respectively mounted fault current limiter on branch road.Arbitrary
Individual described fault current limiter is installed when installing fault current limiter on branch road, all described fault current limiter is serially connected in this failure current limit
Device is installed on branch road.
Owing to short circuit current during described electrical network median generatrix generation three phase short circuit fault is maximum, the shadow of the voltage dip caused
The degree of sound is maximum, thus solve in the present invention is how to alleviate the voltage dip that bus generation three phase short circuit fault causes.Electricity
Online PCC point is the points of common connection that load accesses, thus the PCC point being connected to voltage-sensitive load only carries out research i.e.
Can.
Hereinafter PCC point voltage in fault current limiter alleviation electrical network is dropped principle temporarily to illustrate:
Fault current limiter can alleviate voltage dip, failure current limit as Figure 1-1 while limiting short-circuit current
Device, is formed by current limiter and inverter connecing, and wherein current limiter is series connection current-limiting reactor L, and inverter is for interdicting greatly appearance at a high speed
Amount vacuum circuit breaker QF, has when properly functioning and does not change system impedance, increases the feature of system impedance during short circuit.
In conjunction with Fig. 1-2 and Fig. 1-3, it is assumed that the perunit value of supply voltage (i.e. G point voltage) is 1.0 ∠ 0 °, and PCC point is to power supply
The equivalent reactance of point is Xs, the equivalent reactance of trouble point to PCC point is X1.Ignore impedance ground and load current, fault limit is installed
Before stream device as shown in Figure 1-2, short circuit current is:The voltage dip value of PCC point is:After installation fault current limiter as Figure 1-3, short circuit current becomes: Wherein Δ X by the reactance value of installation fault current limiter；The voltage dip value of PCC point is:Obviously I ' ＜ I, U 'PCC＞ UPCC, it can be seen that install fault current limiter additional in limit
While short circuit current processed, it is also possible to improve the voltage dip value of PCC point.
Wherein, perunit value is numeric indicia method conventional in Power System Analysis and engineering calculation, represents each physical quantity
And the relative value of parameter, it is also possible to think its dimensionless.In Fig. 1-2 and Fig. 1-3, PCC point accesses sensitive load FH.
In the present embodiment, step 502 being judged as, current institute judgement branch road is the relative branch of the fault bus of numbered h
Time, illustrate that the fault bus of numbered h is the bus associated with current institute judgement branch road.Step 5 carries out fault current limiter peace
After dress branch road determines, find out all fault current limiters and branch road is installed, also need, to each fault current limiter, the institute that branch road associates is installed
Faulty bus carries out record respectively.
So, according to described fault current limiter mount scheme, each fault current limiter in described electrical network is installed on branch road
After being respectively mounted fault current limiter, controller each fault current limiter is installed the fault current limiter installed on branch road and enter respectively
Row controls.For fault current limiter any one described install the fault current limiter installed on branch road be controlled time, when with this event
When barrier current limiter installs arbitrary bus generation three phase short circuit fault of branch road association, use described controller to this fault current limiter
The fault current limiter installed on branch road is controlled, make fault current limiter action (even if the inverter of fault current limiter disconnects) and
Produce metering function, when the most just can alleviate due to association bus generation three phase short circuit fault, cause the electricity of selected sensitive load
Pressure fall temporarily.
In the present embodiment, step 502 being judged as, current institute judgement branch road is the relative branch of the fault bus of numbered h
After, also need to be labeled as finding relative branch by the fault bus of numbered h in voltage dip sag exposed areas described in step 4
Fault bus, and the bus that the fault bus that record number is h is the judgement branch road association of current institute.
In the present embodiment, change because of voltage during sensitive load is described electrical network selected in step one or become suddenly
Change and will cause the load of cisco unity malfunction or function reduction, voltage dip threshold value U of selected sensitive loadthreFor making
The temporary depreciation of maximum voltage when selecting sensitive load cisco unity malfunction or during function reduction.
Time actually used, voltage dip threshold value U described in step onethreFor per unit value and Uthre=0.7～0.9.
In the present embodiment, step 5 carries out fault current limiter and installs before branch road determines, first according to apart from described sensitivity
The how far of load access point carries out layering and divides all branch roads of described electrical network, and by all routes of described electrical network
It is respectively divided down in being layered to multiple branch roads；
Wherein, according to the how far apart from described sensitive load access point, all branch roads of described electrical network are layered
During division, process is as follows:
Step A1, the first branch road layering divide: by all branch roads that end points in described electrical network is the bus of numbering j, divide
To the first branch road layering；
Step A2, next branch road layering divide: will be connected with each branch road in upper branch road layering in described electrical network
All branch roads, be divided to the layering of next branch road；
Step A3, one or many repeat step A2, until completing the layering partition process of all branch roads in described electrical network；
In step 5 to each branch road of described electrical network being associated property judges respectively time, process is as follows:
Step B1, the first branch road layering relatedness judge: close each branch road in described first branch road layering respectively
Connection property judges；
After any one described being associated property of branch road in described first branch road layering is judged, all to the most described voltage
In fall sag exposed areas, all fault bus the most all find relative branch to judge temporarily: when in the most described voltage dip sag exposed areas
When all fault bus all find relative branch, complete fault current limiter installation branch road and determine process, and the described voltage found out
In fall sag exposed areas, the relative branch of all fault bus is fault current limiter and installs branch road temporarily；Otherwise, to described first branch road
The next one being associated property of described branch road in layering judges；Further, the completeest when all branch roads in described first branch road layering
When becoming relatedness judgement and described voltage dip sag exposed areas at least one described fault bus of interior existence not to find relative branch, enter
Enter step B2；
Step B2, next branch road layering relatedness judge: close each branch road in next branch road layering respectively
Connection property judges；
After any one described being associated property of branch road in described next branch road layering is judged, all to the most described electricity
In pressure fall sag exposed areas temporarily, all fault bus the most all find relative branch to judge: when the most described voltage dip sag exposed areas
When interior all fault bus all find relative branch, complete fault current limiter installation branch road and determine process, and the described electricity found out
In pressure fall sag exposed areas temporarily, the relative branch of all fault bus is fault current limiter and installs branch road；Otherwise, to the described next one
The next one being associated property of described branch road in branch road layering judges；Further, as all in described next branch road layering
Road all completes relatedness and judges and there is at least one described fault bus in described voltage dip sag exposed areas not find association
Lu Shi, enters step B3；
Step B3, one or many repeat step B2, until finding out all fault bus in described voltage dip sag exposed areas
Relative branch, complete fault current limiter install branch road determine process, and the described voltage dip sag exposed areas found out in all therefore
The relative branch of barrier bus is fault current limiter and installs branch road.
Thus, in described electrical network, the layering division methods of all branch roads is simple and realizes conveniently, with selected sensitive load
The network structure along described electrical network that accesses centered by bus outwards search for, with the access bus of selected sensitive load as branch road
The branch road of end points is divided into the first branch road layering, and the branch road being connected with the branch road in the first branch road layering is divided into the second branch road
All branch roads of electrical network by that analogy, are carried out layering division by layering respectively.
Step 5 carries out fault current limiter and branch road is installed when determining, installed fault current limiter on current institute judgement branch road
Reactance value be reactance limit value X0；In order to make, the reactance value of installation fault current limiter is sufficiently small, to any one in step 6
Described fault current limiter installs the reactance value X of installed fault stop on branch roaddWhen being determined, according to this fault current limiter
Reactance limit value X of installed fault current limiter on branch road is installed0d, use two way classification to be determined.
Wherein, reactance limit value X0And X0dAnd reactance value XdIt is per unit value.Time actually used, those skilled in the art
According to " power engineering electrical design handbook " or " industry and Domestic distribution design manual ", simplicity X can be determined0、X0dAnd XdHave
Name value.Wherein, to X0Famous value when being determined, carry out according to the reference value of reactance on current institute judgement branch road in step 5
Determine；To X0dAnd XdFamous value when being determined, according to this fault current limiter in step 6, the benchmark of reactance on branch road is installed
Value is determined.
Correspondingly, when voltage dip threshold value UthreWhen=0.7～0.9, those skilled in the art are according to " power engineering is electric
Design manual " or " industry and Domestic distribution design manual ", to voltage dip threshold value UthreFamous value be determined.Further,
To voltage dip threshold value UthreFamous value when being determined, according to selected sensitive load access bus in described electrical network
Voltage reference value be determined.
In the present embodiment, step 2 obtains described busbar voltage and drops matrix U temporarilyjWith step 501 obtains described bus
Voltage dip matrix U 'jTime, all use fault position method to be determined.
Described busbar voltage is dropped matrix U by reality temporarilyjIn uijWhen being determined, use fault position method, to described electrical network
In the bus generation three phase short circuit fault of numbered i time numbered j the three-phase voltage sag value of bus calculate.Wherein,
Fault position method is a kind of emulation mode, refer to that Xiao Xianyong, Ma Chao, Li Yong deliver " line fault causes the frequency of voltage sag
Maximum entropy is assessed " content disclosed in [J] one literary composition (" Proceedings of the CSEE ", 2009, VOL.29, (1): the 87-93 page).
It addition, " power technology " 12 interim soup Potiria pectinifera (Mukller et Tro Sehel)s, Wang Chonglin, Shao Guoqing, Huang Qian, skilful cloud of soup in 2012 deliver " a kind of voltage is temporary
Fall and the computational methods of voltage sag domain " in a literary composition, also fault position method is described.
It should be noted that: matrix U drops in described busbar voltage temporarilyjIn uijRepresent the bus generation three-phase shortcircuit of numbered i
The three-phase voltage sag value of the bus of numbered j during fault, this three-phase voltage sag value is under the bus current state of numbered j
Three-phase voltage value rather than the degree of depth of three-phase voltage sag of bus of numbered j.
Time actually used, each bar bus in described electrical network is powered as single-phase electricity, biphase electricity or three-phase electricity.Wherein, when
When the bus of numbered j is powered as single-phase electricity, this bus includes a phase line and a zero line, uijIn a phase voltage
Temporarily depreciation be this bus the voltage dip value of confession single-phase electricity, remaining two phase voltage sag value is all set as that sky (uses PULL table
Show) or all it is set as infinity；When the bus of numbered j powered into biphase electricity time, this bus include two phase lines and
A piece zero line, uijIn two phase voltage sag values be respectively this bus and supplied the voltage dip value of biphase electricity, an other phase electricity
Temporary depreciation is pressed to be set as sky (representing with PULL) or be set as infinity；When the bus of numbered j is powered as three-phase electricity, should
Bar bus includes three phase lines and a zero line, uijIn three-phase voltage sag value be respectively the supplied three-phase electricity of this bus
Voltage dip value.
Busbar voltage described in step 501 drop temporarily matrix U 'jAcquisition methods drop temporarily with busbar voltage described in step 2
Matrix UjAcquisition methods identical.
In the present embodiment, to x in step 3ijValue when being determined, uijAs long as a voltage dip value is had to be less than in
UthreTime, the bus being considered as numbered j there occurs voltage dip, xij=1；Otherwise, xij=0.
In the present embodiment, step 6 use two way classification to reactance value XdWhen being determined, degree of accuracy ε is per unit value and ε
=0.001～0.1.
Time actually used, can according to specific needs the value size of ε be adjusted accordingly.
In the present embodiment, step 6 use two way classification to reactance value XdWhen being determined, comprise the following steps:
Step 601, for the first time value and checking, process is as follows:
Step 6011, determine this interval [a, b], wherein a=0, b=X0d；
Step 6012, seek the midpoint c of interval described in step 6011 [a, b]；Wherein,And the number to M
Value is updated, and makes M=c；Wherein, M is that currently determined fault current limiter installs the reactance installing fault current limiter on branch road
Value and M are perunit value；
Step 6013, a1And b1Determine: first according to voltage dip sag exposed areas described in step 4, obtain currently determined event
Barrier current limiter is installed the busbar voltage of described sensitive load access point after installing the fault stop that reactance value is M on branch road and is dropped temporarily
MatrixWherein, u "hjRepresent currently determined fault current limiter to install on branch road installing reactance value is M's
The three-phase voltage sag value of the bus of numbered j during the fault bus generation three phase short circuit fault of numbered h after fault stop,
u”hjFor described busbar voltage, matrix U drops temporarily "jIn data corresponding to the bus of numbered h；Again square is dropped in described busbar voltage temporarily
Battle array U "jIn currently determined fault current limiter the data corresponding to each bus of branch road association be installed carry out threshold decision respectively, and
According to threshold decision result, to a1And b1It is determined respectively: when judging to show that matrix U drops in described busbar voltage temporarily "jIn current
The data that all buses of determined fault current limiter installation branch road association are corresponding are all not less than UthreTime, a1=a, b1=M；No
Then, a1=M, b1=b；
Wherein, matrix U is dropped in described busbar voltage temporarily "jIn u "hjWhen carrying out threshold decision, by u "hjWith UthreDiffer from
Value compares: work as u "hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u "hjLess than Uthre；Otherwise, it is judged that for u "hjNo
Less than Uthre；
Step 6014, this value and the result obtain: this acquired value and the result include step
M described in the 6012 and a described in step 60131And b1；
Step 602, next time value and checking, process is as follows:
Step 6021, determine this interval [a, b]: according to a in last value and the result1And b1, to this
A and b in secondary interval [a, b] is determined respectively, and is updated the value of a and b respectively；Wherein, a=a1, b=
b1；
Step 6022, seek the midpoint c' of interval described in step 6021 [a, b]；Wherein,And make M
=c', is updated the numerical value of M；
Step 6023, elder generation, according to voltage dip sag exposed areas described in step 4, obtain currently determined fault current limiter peace
After installing, on dress branch road, the fault stop that reactance value is M, matrix drops in the busbar voltage of described sensitive load access point temporarilyWherein, u " 'hjRepresent currently determined fault current limiter to install on branch road installing reactance value is the event of M
The three-phase voltage sag value of the bus of numbered j during the fault bus generation three phase short circuit fault of numbered h after barrier stop,
u”hjFor described busbar voltage, matrix U drops temporarily " 'jIn data corresponding to the bus of numbered h；Again square is dropped in described busbar voltage temporarily
Battle array U " 'jIn currently determined fault current limiter the data corresponding to each bus of branch road association be installed carry out threshold decision respectively, and
According to threshold decision result, to a1And b1It is determined respectively: when judging to show that matrix U drops in described busbar voltage temporarily " 'jIn current
The data that all buses of determined fault current limiter installation branch road association are corresponding are all not less than UthreTime, a1=a, b1=M；No
Then, a1=M, b1=b；
Wherein, matrix U is dropped in described busbar voltage temporarily " 'jIn u " 'hjWhen carrying out threshold decision, by u " 'hjWith UthreEnter
Row difference comparsion: work as u " 'hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u " 'hjLess than Uthre；Otherwise, it is judged that
For u " 'hjIt is not less than Uthre；
Step 6024, general | a1-b1| carry out difference comparsion with degree of accuracy ε: when | a1-b1| during ＜ ε, complete reactance value XdReally
Determine process and Xd=M；Otherwise, step 6025 is entered；
Step 6025, this value and the result obtain: this acquired value and the result include step
M described in the 6022 and a described in step 60231And b1；Afterwards, step 602 is returned.
In the present embodiment, voltage dip threshold value U to selected sensitive load in step onethreAfter being determined, use
The parameter input unit being connected with data handling equipment, to voltage dip threshold value UthreIt is set；
Matrix U drops in busbar voltage temporarily that obtain described sensitive load access point in step 2jAfter, by acquired bus electricity
Matrix U drops in pressure temporarilyjSynchronize to store to the data storage cell being connected with described data handling equipment；
When step 3 carries out the acquisition of sensitive load voltage dip sag exposed areas matrix, described data handling equipment is used to obtain
The voltage dip sag exposed areas matrix X of selected sensitive loadj, and by acquired voltage dip sag exposed areas matrix XjSynchronize storage
To described data storage cell；
When step 4 carries out the acquisition of sensitive load voltage dip sag exposed areas, described data handling equipment is used to obtain selected
Select the voltage dip sag exposed areas of sensitive load, and synchronize acquired voltage dip sag exposed areas to store to described data storage list
In unit；
Step 5 carries out fault current limiter and branch road is installed when determining, use described data handling equipment to institute in step one
Each branch road the being associated property respectively stating electrical network judges, and uses described data handling equipment to described in finding out in step 504
In voltage dip sag exposed areas, the relative branch of all fault bus carries out synchronous recording；
Step 6 carries out fault current limiter and the fault current limiter reactance value of branch road is installed when determining, use at described data
All fault current limiters in step 5 are installed the reactance value of installed fault stop on branch road and are determined respectively by reason equipment,
And to determined by all fault current limiters the reactance value of installed fault stop on branch road be installed carry out synchronous recording.
Further, step one carries out sensitive load selection and before voltage dip threshold value determines, also need to use described data
The electric network model of electrical network described in processing equipment establishment step one, and the method for building up of the electric network model of described electrical network is conventional
Electric network model method for building up.
In the present embodiment, the electric network model of described electrical network is as in figure 2 it is shown, 2 voltages Han 132kV and 33kV in this electrical network
Grade, is made up of 6 generating sets, 30 buses, 37 circuits and 4 transformators.All transformators are Y0/Y0 wiring side
Formula.In this electrical network between branch road between branch road between bus B14 and B15 of 33kV side, B16 and B17, B18 and B19
Between branch road and B29 and B30 between branch road between branch road between branch road, B23 and B24, B21 and B22, B24 and B25
The branch road center line between branch road and B6 and B8 between branch road between bus B2 and B4 of branch road and 132kV side, B2 and B6
Run under the method for operation that way switch disconnects, refer to Fig. 3.So 132kV side electrical network constitutes a looped network, 33kV side electrical network structure
Become radial networks.Selected sensitive load it is connected on bus B7.Described voltage dip threshold value Uthre=0.7.X0=X0d=
10, ε=0.1.
Time actually used, can according to specific needs, to X0、X0dAdjust accordingly with the value size of ε.
According to the method described in step 4, obtain described sensitive load voltage dip sag exposed areas, and described sensitivity is born
Lotus voltage dip sag exposed areas is the fault bus set of selected sensitive load.In the present embodiment, the event of selected sensitive load
Barrier bus collection is combined into { B1, B2, B3, B4, B5, B6, B9, B28}.
In the present embodiment, all fault current limiters found out install branch road, each fault current limiter is installed and pacified on branch road
The reactance value of dress fault current limiter and install the fault bus that associates of branch road with each fault current limiter, refers to table 1:
Table 1 fault current limiter installs branch road and fault current limiter reactance value and relevant fault bus list
Can be found out by table 1, bus B3, B4, B6, B9 and the B28 and first in described sensitive load voltage dip sag exposed areas
Branch road B6～B7 in branch road layering associates (being then only connected to the branch road between bus B6 and B7), uses two way classification to determine branch road B6
～the reactance value of the fault current limiter installed on B7 is 0.77, when the arbitrary bus in bus B3, B4, B6, B9 and B28 occurs
During three phase short circuit fault, the fault current limiter action that branch road B6～B7 is installed, the electricity of the sensitive load that bus B7 accesses
Pressure fall temporarily is eased.Bus B2 and B5 in described sensitive load voltage dip sag exposed areas and the branch road in the layering of the first branch road
B5～B7 (being then only connected to the branch road between bus B5 with B7) associates, and uses two way classification to determine the event installed on branch road B5～B7
The reactance value of barrier current limiter is 0.5, when arbitrary bus generation three phase short circuit fault in bus B2 and B5, on branch road B5～B7
The fault current limiter action installed, the voltage dip of the sensitive load that bus B7 accesses is eased.Described sensitive load
Branch road B4～B6 in bus B1 and second layering branch road in voltage dip sag exposed areas (is then only connected between bus B4 and B6
Branch road) association, employing two way classification determines that the reactance value of the fault current limiter installed on branch road B4～B6 is 0.23, as bus B1
When there is three phase short circuit fault, the fault current limiter action that branch road B4～B6 is installed, the sensitive load that bus B7 accesses
Voltage dip be eased.Thus, when the arbitrary bus generation three-phase shortcircuit in described sensitive load voltage dip sag exposed areas
During fault, the fault current limiter associated with this bus installs the fault current limiter action installed on branch road.
Use fault current limiter mount scheme determined by the present invention that fault current limiter is installed in electrical network as shown in Figure 2
Front and back, voltage dip value U of the access bus B7 (the most described sensitive load access point) of selected sensitive loadB7, such as table 2 institute
Show:
Table 2 is installed fault current limiter context sensitive load and is accessed the voltage dip value contrast table of bus B7
Can be found out by table 2: after fault current limiter is installed, the access bus B7 of selected sensitive load (bear by the most described sensitivity
Lotus access point) voltage dip value UB7Effectively alleviated.
The above, be only presently preferred embodiments of the present invention, not impose any restrictions the present invention, every according to the present invention
Any simple modification, change and the equivalent structure change that above example is made by technical spirit, all still falls within skill of the present invention
In the protection domain of art scheme.
Claims (9)
1. the fault current limiter mounting design method alleviating sensitive load voltage dip, it is characterised in that the method includes
Following steps:
Step one, sensitive load select and voltage dip threshold value determines: select to delay from the electrical network of fault current limiter to be installed
Solve the sensitive load of voltage dip, then voltage dip threshold value U to selected sensitive loadthreIt is determined；
Step 2, the busbar voltage of sensitive load access point drop matrix temporarily and obtain: each bus of electrical network described in obtaining step one is sent out
During raw three phase short circuit fault, matrix drops in the busbar voltage of sensitive load access point temporarilyWherein, i is positive integer
And i=1,2 ..., n, n is the bus total quantity in described electrical network, and i is the numbering of described electrical network median generatrix；Described sensitive load
Access point is sensitive load access bus in described electrical network selected in step one, and j is that selected sensitive load is described
Accessing the numbering of bus in electrical network, j is positive integer and 1≤j≤n；uijWhen representing the bus generation three phase short circuit fault of numbered i
The three-phase voltage sag value of the bus of numbered j；
Step 3, sensitive load voltage dip sag exposed areas matrix obtain: according to the mother of sensitive load access point described in step 2
Line voltage dip matrix Uj, and voltage dip threshold value U described in integrating step onethre, the voltage obtaining selected sensitive load is temporary
Fall sag exposed areas matrixWherein, xij=0 or 1；To xijValue when being determined, work as uijIn at least one phase
Voltage dip value is less than UthreTime, xij=1；Otherwise, xij=0；xij=1 bus generation three phase short circuit fault representing numbered i
Time numbered j bus generation voltage dip；
Step 4, sensitive load voltage dip sag exposed areas obtain: recessed according to the voltage dip of sensitive load selected in step 3
Fall into domain matrix Xj, obtain the voltage dip sag exposed areas of selected sensitive load；
Described voltage dip sag exposed areas is the fault bus set of selected sensitive load, and described fault bus set includes institute
State all fault bus of sensitive load selected in electrical network；Described in described fault bus set, the quantity of fault bus is denoted as
N, wherein N is positive integer, 1≤N≤n；
When judging the fault bus whether bus of numbered i is selected sensitive load, according to the electricity of selected sensitive load
Pressure fall sag exposed areas matrix X temporarilyjIn xijJudge, and work as xijWhen=1, it is judged that the bus for numbered i is selected sensitivity
The fault bus of load；
Step 5, fault current limiter are installed branch road and are determined: sentence each branch road being associated property respectively of electrical network described in step one
Disconnected, and according to relatedness judged result, find out the relative branch of all fault bus in described voltage dip sag exposed areas；
Wherein, to when described in step one, electrical network any one described being associated property of branch road judges, comprise the following steps:
Step 501, according to voltage dip sag exposed areas described in step 4, obtain on current institute judgement branch road install reactance value be X0
Fault current limiter after the busbar voltage of described sensitive load access point matrix drops temporarilyWherein, h is the most whole
Number and h=1,2 ..., N, h is the numbering of fault bus in described voltage dip sag exposed areas；u'hjRepresent at current institute judgement branch road
Upper installation reactance value is X0Fault current limiter after the fault bus generation three phase short circuit fault of numbered h time numbered j mother
The three-phase voltage sag value of line；Wherein, X0By on current institute judgement branch road the reactance limit value of installation fault current limiter and X0For
Per unit value, X0=8～12；
Step 502, busbar voltage described in step 501 is dropped temporarily matrix U 'jIn each data carry out threshold decision, and root respectively
According to threshold decision result, current institute is judged, and whether branch road is that relative branch judges: when judging to draw described busbar voltage
Drop temporarily matrix U 'jIn all data be below UthreTime, it is judged that it is dereferenced branch road for current institute judgement branch road；Otherwise, it is judged that
It is relative branch for current institute judgement branch road, and the reactance limit value of fault current limiter installed on this relative branch is remembered
Record；On this relative branch, the reactance limit value of installed fault current limiter is installed on current institute judgement branch road by step 501
Reactance limit value X of fault current limiter0；
Wherein, described busbar voltage is dropped temporarily matrix U 'jIn u'hjWhen carrying out threshold decision, by u'hjWith UthreCarry out difference ratio
Relatively: work as u'hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u'hjLess than Uthre；Otherwise, it is judged that by currently being sentenced
Disconnected branch road is the relative branch of the fault bus of numbered h；
Step 503, according to the method described in step 501 to step 502, the described branch road of the next one of described electrical network is closed
Connection property judges；
Step 504, step 503 is repeated several times, until the association of all fault bus is propped up in finding out described voltage dip sag exposed areas
Road；
The all relative branches found out in step 504 are fault current limiter and install branch road, and described fault current limiter installs branch road
For described electrical network needs to install the branch road of fault stop；
Step 6, fault current limiter are installed the fault current limiter reactance value of branch road and are determined: to fault current limiters all in step 5
The reactance value of installed fault stop on branch road is installed be determined respectively；
Wherein, fault current limiter any one described is installed the reactance value X of installed fault stop on branch roaddWhen being determined,
Use two way classification to reactance value XdIt is determined；Xd∈[0,X0d], X0dInstall by this fault current limiter, on branch road, fault is installed
The reactance limit value of current limiter, X0dFor per unit value and X0d=8～12.
2. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1, its
Be characterised by: after step 502 is judged as the relative branch of fault bus that current institute judgement branch road is numbered h, also need by
In voltage dip sag exposed areas described in step 4, the fault bus of numbered h is labeled as finding the fault bus of relative branch,
And the bus that the fault bus that record number is h is the judgement branch road association of current institute.
3. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1 or 2,
It is characterized in that: because voltage changes or change will cause suddenly during selected in step one, sensitive load is described electrical network
Cisco unity malfunction or the load of function reduction, voltage dip threshold value U of selected sensitive loadthreFor making selected sensitivity
The temporary depreciation of maximum voltage during load cisco unity malfunction or during function reduction.
4. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1 or 2,
It is characterized in that: step 5 carries out fault current limiter and installs before branch road determines, first access according to apart from described sensitive load
The how far of point carries out layering and divides all branch roads of described electrical network, and is from top to bottom divided by all branch roads of described electrical network
It is not divided in the layering of multiple branch road；
Wherein, according to the how far apart from described sensitive load access point, all branch roads of described electrical network are carried out layering to divide
Time, process is as follows:
Step A1, the first branch road layering divide: by all branch roads that end points in described electrical network is the bus of numbering j, be divided to the
One branch road layering；
Step A2, next branch road layering divide: the institute being connected with each branch road in upper branch road layering in described electrical network
There is branch road, be divided to next branch road layering；
Step A3, one or many repeat step A2, until completing the layering partition process of all branch roads in described electrical network；
In step 5 to each branch road of described electrical network being associated property judges respectively time, process is as follows:
Step B1, the first branch road layering relatedness judge: to each branch road the being associated property respectively in described first branch road layering
Judge；
After any one described being associated property of branch road in described first branch road layering is judged, all to the most described voltage dip
In sag exposed areas, all fault bus the most all find relative branch to judge: when all in the most described voltage dip sag exposed areas
When fault bus all finds relative branch, complete fault current limiter installation branch road and determine process, and the described voltage dip found out
In sag exposed areas, the relative branch of all fault bus is fault current limiter and installs branch road；Otherwise, to described first branch road layering
The interior next one being associated property of described branch road judges；Further, all complete to close when all branch roads in described first branch road layering
When connection property judges and in described voltage dip sag exposed areas, at least one described fault bus of existence does not finds relative branch, enter step
Rapid B2；
Step B2, next branch road layering relatedness judge: to each branch road the being associated property respectively in next branch road layering
Judge；
After any one described being associated property of branch road in described next branch road layering is judged, all temporary to the most described voltage
In fall sag exposed areas, all fault bus the most all find relative branch to judge: when institute in the most described voltage dip sag exposed areas
When faulty bus all finds relative branch, complete fault current limiter installation branch road and determine process, and the described voltage found out is temporary
In fall sag exposed areas, the relative branch of all fault bus is fault current limiter and installs branch road；Otherwise, to described next branch road
The next one being associated property of described branch road in layering judges；Further, equal when all branch roads in described next branch road layering
Complete relatedness judge and there is at least one described fault bus in described voltage dip sag exposed areas when not finding relative branch,
Enter step B3；
Step B3, one or many repeat step B2, until the pass of all fault bus in finding out described voltage dip sag exposed areas
Connection branch road, completes fault current limiter installation branch road and determines faulty mother in process, and the described voltage dip sag exposed areas found out
The relative branch of line is fault current limiter and installs branch road.
5. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1 or 2,
It is characterized in that: step 2 obtains described busbar voltage and drops matrix U temporarilyjDrop temporarily with step 501 obtains described busbar voltage
Matrix U 'jTime, all use fault position method to be determined.
6. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1 or 2,
It is characterized in that: step 6 uses two way classification to reactance value XdWhen being determined, degree of accuracy ε be per unit value and ε=0.001～
0.1。
7. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 6, its
It is characterised by: step 6 uses two way classification to reactance value XdWhen being determined, comprise the following steps:
Step 601, for the first time value and checking, process is as follows:
Step 6011, determine this interval [a, b], wherein a=0, b=X0d；
Step 6012, seek the midpoint c of interval described in step 6011 [a, b]；Wherein,And the numerical value of M is entered
Row updates, and makes M=c；Wherein, M is that currently determined fault current limiter installs reactance value and the M installing fault current limiter on branch road
For perunit value；
Step 6013, a1And b1Determine: first according to voltage dip sag exposed areas described in step 4, obtain currently determined fault limit
Stream device is installed the busbar voltage of described sensitive load access point after installing the fault stop that reactance value is M on branch road and is dropped matrix temporarilyWherein, u "hjRepresent currently determined fault current limiter to install on branch road installing reactance value is the fault of M
The three-phase voltage sag value of the bus of numbered j, u during the fault bus generation three phase short circuit fault of numbered h after stop "hj
For described busbar voltage, matrix U drops temporarily "jIn data corresponding to the bus of numbered h；Again matrix U is dropped in described busbar voltage temporarily "j
In currently determined fault current limiter the data corresponding to each bus of branch road association be installed carry out threshold decision respectively, and according to threshold
Value judged result, to a1And b1It is determined respectively: when judging to show that matrix U drops in described busbar voltage temporarily "jIn currently determined
The data that all buses of fault current limiter installation branch road association are corresponding are all not less than UthreTime, a1=a, b1=M；Otherwise, a1=
M, b1=b；
Wherein, matrix U is dropped in described busbar voltage temporarily "jIn u "hjWhen carrying out threshold decision, by u "hjWith UthreCarry out difference ratio
Relatively: work as u "hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u "hjLess than Uthre；Otherwise, it is judged that for u "hjIt is not less than
Uthre；
Step 6014, this value and the result obtain: this acquired value and the result include in step 6012
Described M and a described in step 60131And b1；
Step 602, next time value and checking, process is as follows:
Step 6021, determine this interval [a, b]: according to a in last value and the result1And b1, this is taken
A and b in value interval [a, b] is determined respectively, and is updated the value of a and b respectively；Wherein, a=a1, b=b1；
Step 6022, seek the midpoint c' of interval described in step 6021 [a, b]；Wherein,And make M=c',
The numerical value of M is updated；
Step 6023, elder generation, according to voltage dip sag exposed areas described in step 4, obtain the installation of currently determined fault current limiter
After installing the fault stop that reactance value is M on road, matrix drops in the busbar voltage of described sensitive load access point temporarilyWherein, u " 'hjRepresent currently determined fault current limiter to install on branch road installing reactance value is the event of M
The three-phase voltage sag value of the bus of numbered j during the fault bus generation three phase short circuit fault of numbered h after barrier stop,
u”hjFor described busbar voltage, matrix U drops temporarily " 'jIn data corresponding to the bus of numbered h；Again square is dropped in described busbar voltage temporarily
Battle array U " 'jIn currently determined fault current limiter the data corresponding to each bus of branch road association be installed carry out threshold decision respectively, and
According to threshold decision result, to a1And b1It is determined respectively: when judging to show that matrix U drops in described busbar voltage temporarily " 'jIn current
The data that all buses of determined fault current limiter installation branch road association are corresponding are all not less than UthreTime, a1=a, b1=M；No
Then, a1=M, b1=b；
Wherein, matrix U is dropped in described busbar voltage temporarily " 'jIn u " 'hjWhen carrying out threshold decision, by u " 'hjWith UthreDiffer from
Value compares: work as u " 'hjIn at least one phase voltage sag value less than UthreTime, it is judged that for u " 'hjLess than Uthre；Otherwise, it is judged that for
u”'hjIt is not less than Uthre；
Step 6024, general | a1-b1| carry out difference comparsion with degree of accuracy ε: when | a1-b1| during ＜ ε, complete reactance value XdDetermination
Journey and Xd=M；Otherwise, step 6025 is entered；
Step 6025, this value and the result obtain: this acquired value and the result include in step 6022
Described M and a described in step 60231And b1；Afterwards, step 602 is returned.
8. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1 or 2,
It is characterized in that: voltage dip threshold value U to selected sensitive load in step onethreAfter being determined, use and at data
The parameter input unit that reason equipment connects, to voltage dip threshold value UthreIt is set；
Matrix U drops in busbar voltage temporarily that obtain described sensitive load access point in step 2jAfter, by temporary for acquired busbar voltage
Fall matrix UjSynchronize to store to the data storage cell being connected with described data handling equipment；
When step 3 carries out the acquisition of sensitive load voltage dip sag exposed areas matrix, described data handling equipment is used to obtain selected
Select the voltage dip sag exposed areas matrix X of sensitive loadj, and by acquired voltage dip sag exposed areas matrix XjSynchronization stores to institute
State in data storage cell；
When step 4 carries out the acquisition of sensitive load voltage dip sag exposed areas, described data handling equipment is used to obtain selected quick
The voltage dip sag exposed areas of sense load, and synchronize to store to described data storage cell by acquired voltage dip sag exposed areas
In；
Step 5 carries out fault current limiter and branch road is installed when determining, use described data handling equipment to electricity described in step one
Each branch road being associated property respectively of net judges, and uses the described data handling equipment described voltage to finding out in step 504
In fall sag exposed areas, the relative branch of all fault bus carries out synchronous recording temporarily；
Step 6 carries out fault current limiter and the fault current limiter reactance value of branch road is installed when determining, use described data to process and set
It is determined respectively for all fault current limiters in step 5 being installed the reactance value of installed fault stop on branch road, and right
Determined by all fault current limiters the reactance value of installed fault stop on branch road be installed carry out synchronous recording.
9. according to a kind of fault current limiter mounting design method alleviating sensitive load voltage dip described in claim 1 or 2,
It is characterized in that: voltage dip threshold value U described in step onethreFor per unit value and Uthre=0.7～0.9.
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