CN107229003A - The discrimination method and device of weakness zone temporarily drop in a kind of line voltage - Google Patents
The discrimination method and device of weakness zone temporarily drop in a kind of line voltage Download PDFInfo
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- CN107229003A CN107229003A CN201710581389.7A CN201710581389A CN107229003A CN 107229003 A CN107229003 A CN 107229003A CN 201710581389 A CN201710581389 A CN 201710581389A CN 107229003 A CN107229003 A CN 107229003A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses the discrimination method and device that weakness zone temporarily drops in a kind of line voltage, this method includes：According to the fault type of every of acquisition faulty line, corresponding voltage equation is selected；Fall amplitude at sensitiveness load access point according to caused by voltage equation solves the head-end and tail end point failure of every faulty line, and calculate the corresponding vulnerability indicator vector of every faulty line；According to the numerical value of vulnerability indicator vector, the corresponding weakness zone of every faulty line is determined using Fibonacci method and/or secant iterative method；The present invention can calculate by selecting corresponding voltage equation and fall amplitude at sensitiveness load access point caused by upper any point failure of every faulty line；The corresponding weakness zone of every faulty line is determined by using Fibonacci method and/or secant iterative method, it is possible to use the mixed method of Fibonacci method and secant iterative method, critical point is calculated, so that it is determined that weakness zone temporarily drops in line voltage.
Description
Technical field
The present invention relates to electric power quality evaluation areas, weakness zone temporarily drops in more particularly to a kind of line voltage
Discrimination method and device.
Background technology
With the development of modern society's new and high technology, sensitive equipment gradually increases in power system, the voltage dip of power network
Sensitive device can be caused to trip or maloperation, whole end-user processes are influenceed, cause huge production and economic loss.
Voltage dip is according to IEEE IEEE definition, and voltage root mean square is reduced to 0.1 under the conditions of referring to power frequency
Between~0.9 times of rated voltage, the duration be that 0.5 cycle (being calculated with China power frequency 50Hz, 1 cycle is 20ms) is short to 1min
Time voltage cogging phenomenon.Voltage dip includes two features：Voltage dip amplitude and voltage dip duration.Because system
Failure is uncertain, so essentially voltage dip occurs at random.Therefore, Voltage Dip in Power Systems is asked
Topic is analyzed, assesses and be of great practical significance.
The effective countermeasure and alleviation plan proposed for Problem of Voltage Temporary-Drop is needed to the temporary drop Performance Evaluation of system voltage.Estimate
It is highly effective that the sagging frequency of expection (ESF) on meter systems circuit temporarily drops performance for understanding system voltage.Generally, it can use
The concepts of weakness zone (AOV) and system outage statistics carries out ESF estimations.AOV can represent to cause the electricity of sensitive load point
Pressure amplitude value is dropped to less than the fault coverage to voltage threshold.By system outage statistics amount is multiplied by circuit total length and
The circuit number that is included in AOV calculates ESF.Therefore, AOV is accurately determined to weigh very much for assessment system voltage dip performance
Will.
In the prior art, for the discrimination method of weakness zone, such as critical distance method and fault position method, often to big rule
The critical point of mould power system and the calculating of weakness zone have many defects or excessively taken, and can cause in some cases
Led to divergence when calculating critical point, temporary to line voltage can not drop weakness zone and carry out accurate and quickly identification.Therefore,
How the discrimination method that a kind of computing is less and there is the line voltage of higher reference confidence level temporarily to drop weakness zone is provided, with
It is easy to analyze Voltage Dip in Power Systems problem, is urgent problem now.
The content of the invention
It is an object of the invention to provide the discrimination method and device that weakness zone temporarily drops in a kind of line voltage, to utilize gold
The mixed method of split plot design and secant iterative method, determines that weakness zone temporarily drops in line voltage, computing is less and with higher ginseng
Examine confidence level.
In order to solve the above technical problems, the present invention provides the discrimination method that weakness zone temporarily drops in a kind of line voltage, including：
According to the fault type of every of acquisition faulty line, corresponding voltage equation is selected；Wherein, the voltage equation
To fall amplitude at sensitiveness load access point caused by the failure of any point on corresponding faulty line for calculating；
The sensitiveness load according to caused by the voltage equation solves the head-end and tail end point failure of every faulty line
Fall amplitude at access point, and calculate the corresponding vulnerability indicator vector of every faulty line；Wherein, the vulnerability index
The numerical value of vector is the relation of corresponding faulty line and weakness zone；
According to the numerical value of the vulnerability indicator vector, every event is determined using Fibonacci method and/or secant iterative method
Hinder the corresponding weakness zone of circuit.
Optionally, it is described according to caused by the voltage equation solves the head-end and tail end point failure of every faulty line
Fall amplitude at sensitiveness load access point, and before calculating the corresponding vulnerability indicator vector of every faulty line, also wrap
Include：
Voltage before the failure of every faulty line is calculated by tidal current analysis；
The order impedance matrix of every faulty line is obtained using sequence admittance matrix.
Optionally, the fault type of every faulty line according to acquisition, selects corresponding voltage equation, including：
If the fault type of the current failure circuit obtained is A phase singlephase earth faults, the voltage equation selected is：With
Wherein, s is the sensitiveness load access point of the current failure circuit,WithRespectively described current event
The phase voltage amplitude of A phases, B phases and C phases at the s points of barrier circuit,Before the failure at the s points of the current failure circuit
Voltage；For complex operator,For the sequence electricity before the failure at the abort situation K points of the current failure circuit
Pressure；WithPositive and negative and zero sequence mutual impedance between the s points and K points of respectively described current failure circuit；WithPositive and negative and zero sequence self-impedance at the K points of respectively described current failure circuit；
If the fault type of the current failure circuit is the two-phase short-circuit fault of B phases and C phases, the voltage equation selected
For：With
If the fault type of the current failure circuit is the line to line fault earth fault of B phases and C phases, the voltage selected
Equation is：
With
If the fault type of the current failure circuit is three phase short circuit fault, the voltage equation selected is：Wherein,For the phase voltage amplitude at the s points of the current failure circuit.
Optionally, it is described according to caused by the voltage equation solves the head-end and tail end point failure of every faulty line
Fall amplitude at sensitiveness load access point, and calculate the corresponding vulnerability indicator vector of every faulty line, including：
According to the corresponding voltage equation of the current failure circuit, the head-end and tail end of the current failure circuit are solved
Fall amplitude at sensitiveness load access point caused by point failure；Wherein, if the corresponding voltage side of the current failure circuit
Journey is the voltage equation of three phase short circuit fault, then sensitiveness load caused by the head end point failure of the current failure circuit is accessed
Fall amplitude at point | f (Fi) | and caused by the tail end point failure of the current failure circuit at sensitiveness load access point
Fall amplitude | f (Ti) | it is respectivelyWithIf the corresponding voltage equation of the current failure circuit is not three-phase
The voltage equation of short trouble, then | f (Fi) | it isWithIn minimum value, | f (Ti) | it isWithIn minimum value, i be the current failure circuit, FiFor the current failure circuit
Head-end, TiFor the tail point of the current failure circuit；
Utilize falling at sensitiveness load access point caused by the head-end and tail end point failure of the current failure circuit
Fall amplitude be individually subtracted voltage threshold difference with 0 comparison, determine the current failure circuit head-end and tail point it is thin
Weak property index vector is 0 or 1；Wherein, the vulnerability index vector of the head-end of the current failure circuitThe vulnerability index vector of the tail point of the current failure circuitVthFor the voltage threshold；
By the head-end of the current failure circuit and the vulnerability index vector addition of tail point, the current event is determined
Hinder the vulnerability indicator vector of circuit；Wherein, the vulnerability indicator vector of the current failure circuit
Optionally, the numerical value according to the vulnerability indicator vector, utilizes Fibonacci method and/or secant iterative method
The corresponding weakness zone of every faulty line is determined, including：
If the numerical value of the vulnerability indicator vector of the current failure circuit is 0, do not wrapped in the current failure circuit
Containing the weakness zone；
If the numerical value of the vulnerability indicator vector of the current failure circuit is 1, the current failure circuit is utilized
The amplitude of falling of the intermediate point for falling amplitude and the current failure circuit of head-end and tail point constructs the first quadratic interpolation
Equation, and according to the first quadratic interpolation equation root, the first critical point is calculated using the secant iterative method, it is determined that described
The weakness zone included in current failure circuit；Wherein, the quantity of the first quadratic interpolation equation root is 1, described
The quantity of first critical point is 1；
If the numerical value of the vulnerability indicator vector of the current failure circuit is 1, solved using the Fibonacci method
At the corresponding voltage equation of the current failure circuit, the corresponding sensitiveness load access point for obtaining the current failure circuit
Maximum fall amplitude, and judge that the maximum falls whether amplitude is more than the voltage threshold；
If so, then the current failure circuit is the weakness zone；
If it is not, using the current failure circuit head-end and tail point fall amplitude and the maximum falls amplitude
Construct the second quadratic interpolation equation, and according to the second quadratic interpolation equation root, the is calculated using the secant iterative method
Two critical points, determine the weakness zone included in the current failure circuit；Wherein, the second quadratic interpolation equation
The quantity of root is 2, and the quantity of second critical point is 2.
Optionally, it is described to solve the corresponding voltage equation of the current failure circuit using the Fibonacci method, obtain
Maximum at the corresponding sensitiveness load access point of the current failure circuit falls amplitude, including：
The first preset and the second preset of the current failure circuit are determined according to golden ratio formula；Wherein, institute
Stating golden ratio formula isFirst preset isDescribed second
Preset is For the 3rd preset of the current failure circuit,To be described current
4th preset of faulty line；
By the corresponding voltage equation of the current failure circuit, first preset and second preset are calculated
Fall amplitude at sensitiveness load access point caused by failure；Wherein, if the corresponding voltage equation of the current failure circuit
For the voltage equation of three phase short circuit fault, then fall width at sensitiveness load access point caused by the described first default point failure
ValuePreset with described second and fall amplitude at sensitiveness load access point caused by point failureRespectivelyWithIf the corresponding voltage equation of the current failure circuit is not the voltage equation of three phase short circuit fault,For WithIn minimum value,ForWithIn
Minimum value；
Judge whether to fall amplitude more than described at sensitiveness load access point caused by the described first default point failure
Fall amplitude at sensitiveness load access point caused by second default point failure；
If caused by the described first default point failure at sensitiveness load access point to fall amplitude pre- more than described second
Set up an office and fall amplitude at sensitiveness load access point caused by failure, then makeWith
If the amplitude of falling caused by the described first default point failure at sensitiveness load access point is not more than described second
Fall amplitude at sensitiveness load access point caused by default point failure, then makeWith
Judge that whether the 4th preset subtracts the poor absolute value of the 3rd preset less than pre-set tolerance；
If the poor absolute value that the 4th preset subtracts the 3rd preset is less than pre-set tolerance, iteration is whole
Only, obtain the maximum at the corresponding sensitiveness load access point of the current failure circuit and fall amplitude；Wherein, the current event
Maximum at the corresponding sensitiveness load access point of barrier circuit falls amplitude and is
If the poor absolute value that the 4th preset subtracts the 3rd preset is not less than pre-set tolerance, institute is performed
State by the corresponding voltage equation of the current failure circuit, calculate falling for first preset and second preset
The step of amplitude.
Optionally, it is described according to the first quadratic interpolation equation root, calculate first using the secant iterative method and face
Boundary's point, including：
According to the first quadratic interpolation equation root, the first initial point and the second initial point are determined；Wherein, described first
Initial point and second initial point are respectively the different points on the current failure circuit, and with first quadratic interpolation
The distance of equation root is less than distance threshold；
Pass throughDetermine the estimation point of the current failure circuit；Its
In,For the estimation point,WithRespectively described first initial point and second initial point,WithFalling at sensitiveness load access point caused by respectively described first initial point and the second initial point failure
Amplitude；
Judge that the amplitude of falling caused by the estimation point failure at sensitiveness load access point subtracts the voltage threshold
Difference whether be less than predetermined tolerance；
If it is not, then makingPass through described in performingIt is determined that
The step of estimation point；
If so, then the estimation point is first critical point.
Optionally, the numerical value according to the vulnerability indicator vector, utilizes Fibonacci method and/or secant iterative method
Before determining the corresponding weakness zone of every faulty line, in addition to：
Store the corresponding relation of every faulty line and corresponding voltage equation and the head-end of every faulty line and tail
Fall amplitude at sensitiveness load access point caused by end points failure.
In addition, present invention also offers the device for identifying that weakness zone temporarily drops in a kind of line voltage, including：
Selecting module, for the fault type of every faulty line according to acquisition, selects corresponding voltage equation；Its
In, the voltage equation is for calculating on corresponding faulty line caused by the failure of any point at sensitiveness load access point
Fall amplitude；
Computing module, head-end and tail end point failure for solving every faulty line according to the voltage equation cause
Sensitiveness load access point at fall amplitude, and calculate the corresponding vulnerability indicator vector of every faulty line；Wherein, institute
State relation of the numerical value of vulnerability indicator vector for corresponding faulty line and weakness zone；
Determining module, for the numerical value according to the vulnerability indicator vector, utilizes Fibonacci method and/or secant iteration
Method determines the corresponding weakness zone of every faulty line.
Optionally, the device also includes：
Voltage before tidal current analysis module, the failure for calculating every faulty line by tidal current analysis；
Acquisition module, the order impedance matrix for obtaining every faulty line using sequence admittance matrix.
The discrimination method of weakness zone temporarily drops in a kind of line voltage provided by the present invention, including：According to every of acquisition
The fault type of faulty line, selects corresponding voltage equation；Wherein, voltage equation is for calculating corresponding faulty line
Fall amplitude at sensitiveness load access point caused by the failure of any point；Every faulty line is solved according to voltage equation
Fall amplitude at sensitiveness load access point caused by head-end and tail end point failure, and it is corresponding to calculate every faulty line
Vulnerability indicator vector；Wherein, the numerical value of vulnerability indicator vector is the relation of corresponding faulty line and weakness zone；According to
The numerical value of vulnerability indicator vector, the corresponding weakness of every faulty line is determined using Fibonacci method and/or secant iterative method
Region；
It can be seen that, the present invention selects corresponding voltage equation by the fault type of every faulty line according to acquisition, can
Fall amplitude at sensitiveness load access point caused by upper any point failure of every faulty line to calculate；By calculating
The corresponding vulnerability indicator vector of every faulty line, can obtain the quantity of the critical point of every faulty line；By using
Fibonacci method and/or secant iterative method determine the corresponding weakness zone of every faulty line, it is possible to use Fibonacci method and
The mixed method of secant iterative method, calculates critical point, so that it is determined that weakness zone temporarily drops in line voltage so that computing is less and has
There is higher reference confidence level, power system voltage can be effectively used for and temporarily drop Performance Evaluation analysis, to vast power customer
High-quality production and operation it is significant.In addition, temporarily dropping weakness zone present invention also offers a kind of line voltage
Device for identifying, equally with above-mentioned beneficial effect.
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 accompanying drawing used required 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.
The flow chart of the discrimination method of weakness zone temporarily drops in a kind of line voltage that Fig. 1 is provided by the embodiment of the present invention；
The structure chart of the device for identifying of weakness zone temporarily drops in a kind of line voltage that Fig. 2 is provided by the embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is refer to, the discrimination method of weakness zone temporarily drops in a kind of line voltage that Fig. 1 is provided by the embodiment of the present invention
Flow chart.This method can include：
Step 101：According to the fault type of every of acquisition faulty line, corresponding voltage equation is selected；Wherein, voltage
Equation is to fall amplitude at sensitiveness load access point caused by the failure of any point on corresponding faulty line for calculating.
Wherein, the faulty line in this step can be the circuit for the failure that there is corresponding fault type, faulty line
Can be the circuit broken down in actual use, the method as embodiment is provided is sent out in actual use in circuit
After raw failure, the circuit is defined as faulty line；Can also be temporary to line voltage for the method that is provided using the present embodiment
During drop weakness zone is recognized, the circuit broken down is set, the method as embodiment is provided also includes to every
The step of bar circuit sets the failure of correspondence fault type, makes every circuit turn into corresponding faulty line.
It is understood that the purpose of this step can be the fault type by every faulty line, obtain based on
Calculate the voltage equation for falling amplitude caused by the failure of any point at sensitiveness load access point on corresponding faulty line.It is right
It is specific in the setting of fault type and voltage equation, can voluntarily it be set by designer, as long as corresponding failure can be calculated
On the faulty line of type caused by the failure of any point at sensitiveness load access point fall it is quick after amplitude, that is, failure
Phase voltage amplitude at inductive load access point, the present embodiment is unrestricted to this.
Specifically, positive sequence impedance (Z can be used1), negative sequence impedance (Z2) and zero sequence impedance (Z0) three symmetrical components
System impedance model fall width calculate the sensitiveness load access point caused by the failure of any point on faulty line
Value, as this step can be：If the fault type of the current failure circuit obtained is A phase singlephase earth faults, the electricity selected
Pressure equation be：
WithWherein, s is the sensitiveness load access point of current failure circuit,WithThe phase voltage amplitude of A phases, B phases and C phases respectively at the s points of current failure circuit,For
Voltage before failure at the s points of current failure circuit；For complex operator,For the failure of current failure circuit
The sequence voltage before failure at position K points；WithBetween the s points and K points of respectively described current failure circuit
Positive and negative and zero sequence mutual impedance；WithPositive and negative and zero sequence at the K points of respectively described current failure circuit hinders certainly
It is anti-；
If the fault type of current failure circuit is the two-phase short-circuit fault of B phases and C phases, the voltage equation selected is：With
If the fault type of current failure circuit is the line to line fault earth fault of B phases and C phases, the voltage equation selected
For：
With
If the fault type of current failure circuit is three phase short circuit fault, the voltage equation selected is：Wherein,For the phase voltage amplitude at the s points of current failure circuit.
Wherein, current failure circuit can be any one faulty line in whole faulty lines in this step.
It is understood that according to singlephase earth fault, two-phase short-circuit fault, line to line fault earth fault and three-phase shortcircuit
These four fault types of failure, can solve appointing on the corresponding faulty line of fault type with the corresponding voltage equation of above-mentioned selection
Anticipate the phase voltage amplitude of a bit.If fault type is three phase short circuit fault, amplitude is fallen at any point on faulty line
For phase voltage amplitudeIf fault type is not three phase short circuit fault, any point (K) failure on faulty line is drawn
Amplitude of falling at the sensitiveness load access point risen is three phase voltage amplitudesWithIn minimum value.
It should be noted that in above-mentioned voltage equationWithCan be by such as WithThese three formula are corresponding to be obtained.Wherein,It is
Driving point sequence impedance at abort situation K points,WithIt is the head-end F and tail point T of faulty line driving point respectively
Sequence impedance,It is the transmission sequence impedance between the head-end F of faulty line and tail point T,It is the head-end F of faulty line
Circuit sequence impedance between tail point T,It is the transmission sequence resistance between any point s of faulty line and abort situation K
It is anti-,Be faulty line sensitiveness load access point s and head-end F between transmission sequence impedance,It is faulty line
Transmission sequence impedance between sensitiveness load access point s and tail point T,Be abort situation K failure before sequence voltage,WithBe respectively faulty line head-end F and tail point T failure before sequence voltage, and p be abort situation K with
The ratio length of faulty line F-T (0≤p≤1) whole length.
It is corresponding, in order to carry out solving so as to obtain in above-mentioned voltage equation to above three formula WithBefore corresponding voltage equation, that is, before step 102, also
Voltage before failure that can be including calculating every faulty line by tidal current analysis；Every fault wire is obtained using sequence admittance matrix
The order impedance matrix Z on road012The step of, voltage and order impedance matrix before the failure to obtain any point of every faulty line
Z012。
Step 102：The sensitiveness according to caused by voltage equation solves the head-end and tail end point failure of every faulty line
Fall amplitude at load access point, and calculate the corresponding vulnerability indicator vector of every faulty line；Wherein, vulnerability mark sense
The numerical value of amount is the relation of corresponding faulty line and weakness zone.
It is understood that the numerical value of the corresponding vulnerability indicator vector of every faulty line can be corresponding fault wire
The quantity of critical point in road, that is, corresponding faulty line and weakness zone relation.If not depositing in faulty line
In critical point, then weakness zone is not included in faulty line；If in one critical point of presence in faulty line, faulty line
Comprising a weakness zone, that is, faulty line one end in weakness zone；If the presence two in faulty line is critical
Point, then comprising two weakness zones or in weakness zone in faulty line, that is, faulty line two ends in weak area
In domain.
Specifically, this step can be：According to the corresponding voltage equation of current failure circuit, current failure circuit is solved
Fall amplitude at sensitiveness load access point caused by head-end and tail end point failure；Wherein, if current failure circuit correspondence
Voltage equation be three phase short circuit fault voltage equation, then sensitiveness load caused by the head end point failure of current failure circuit
Fall amplitude at access point | f (Fi) | and caused by the tail end point failure of current failure circuit at sensitiveness load access point
Fall amplitude | f (Ti) | it is respectivelyWithIf the corresponding voltage equation of current failure circuit is not three-phase shortcircuit
The voltage equation of failure, then | f (Fi) | it isWithIn minimum value, | f (Ti) | it isWithIn minimum value, i be current failure circuit, FiFor the head-end of current failure circuit, Ti
For the tail point of current failure circuit；
Using falling width at sensitiveness load access point caused by the head-end and tail end point failure of current failure circuit
Difference and 0 comparison of voltage threshold is individually subtracted in value, determines the head-end of current failure circuit and the vulnerability index of tail point
Vector is 0 or 1；Wherein, the vulnerability index vector of the head-end of current failure circuitWhen
The vulnerability index vector of the tail point of prior fault circuitVthFor voltage threshold；
By the head-end of current failure circuit and the vulnerability index vector addition of tail point, current failure circuit is determined
Vulnerability indicator vector；Wherein, the vulnerability indicator vector of current failure circuit
It is understood that due to sensitiveness load access caused by the head-end and tail end point failure of every faulty line
Amplitude of falling at point needs also exist for using in step 103, therefore, it can the head that storage solves every obtained faulty line
Fall amplitude at sensitiveness load access point caused by end points and tail end point failure, for convenience to the head of every faulty line
The calculating process fallen in the storage and this step of amplitude caused by end points and tail end point failure at sensitiveness load access point,
The head-end of every faulty line and falling for tail point that amplitude vector obtains matrix form can be fallen by corresponding two
Fall amplitude, e.g.,
Two are fallen amplitude and areWithWherein, Vmag,FFor the head of every faulty line
Fall amplitude vector, V at sensitiveness load access point caused by end points failuremag,TFor the tail end point failure of every faulty line
Fall amplitude vector at caused sensitiveness load access point, n is the corresponding quantity of whole faulty lines, and i represents current event
Hinder circuit to be less than or equal to n positive integer more than or equal to 1.
It is corresponding, the vulnerability index vector of the head-end of every faulty line, the vulnerability index vector of tail point
Vulnerability indicator vector is respectively WithWherein,
It should be noted that the head-end and the vulnerability of tail point of the current failure circuit solved through the above way
Index vectorWithCan be 1 or 0 respectively.The vulnerability indicator vector LVI of corresponding current failure circuitiCan be
0th, 1 or 2, represent the quantity of the critical point in current failure circuit.
Step 103：According to the numerical value of vulnerability indicator vector, determined using Fibonacci method and/or secant iterative method every
The corresponding weakness zone of bar faulty line.
Specifically, if the numerical value that this step can be the vulnerability indicator vector of current failure circuit is 0, current failure
Weakness zone is not included in circuit；
If the numerical value of the vulnerability indicator vector of current failure circuit be 1, using current failure circuit head-end and
The amplitude of falling of the intermediate point for falling amplitude and current failure circuit of tail point constructs the first quadratic interpolation equation, and according to the
One quadratic interpolation equation root, calculates the first critical point using secant iterative method, determines the weakness included in current failure circuit
Region；Wherein, the quantity of the first quadratic interpolation equation root is 1, and the quantity of the first critical point is 1；
If the numerical value of the vulnerability indicator vector of current failure circuit is 1, current failure is solved using Fibonacci method
The corresponding voltage equation of circuit, obtains the maximum at the corresponding sensitiveness load access point of current failure circuit and falls amplitude,
And judge that maximum falls whether amplitude is more than voltage threshold；
If so, then current failure circuit is weakness zone；
If it is not, using current failure circuit head-end and tail point fall amplitude and maximum falls amplitude construction second
Quadratic interpolation equation, and according to the second quadratic interpolation equation root, the second critical point is calculated using secant iterative method, it is determined that currently
The weakness zone included in faulty line；Wherein, the quantity of the second quadratic interpolation equation root is 2, the quantity of the second critical point
For 2.
Wherein, the corresponding voltage equation of current failure circuit is solved using Fibonacci method, obtains current failure circuit
The step of maximum at corresponding sensitiveness load access point falls amplitude, can include：Institute is determined according to golden ratio formula
State the first preset and the second preset of current failure circuit；Wherein, the golden ratio formula isFirst preset isSecond preset is For the 3rd preset of the current failure circuit,For the current failure circuit
The 4th preset；
By the corresponding voltage equation of the current failure circuit, first preset and second preset are calculated
Fall amplitude at sensitiveness load access point caused by failure；Wherein, if the corresponding voltage equation of the current failure circuit
For the voltage equation of three phase short circuit fault, then fall width at sensitiveness load access point caused by the described first default point failure
ValuePreset with described second and fall amplitude at sensitiveness load access point caused by point failureRespectivelyWithIf the corresponding voltage equation of the current failure circuit is not the voltage equation of three phase short circuit fault,For WithIn minimum value,ForWithIn
Minimum value；
Judge whether to fall amplitude more than described at sensitiveness load access point caused by the described first default point failure
Fall amplitude at sensitiveness load access point caused by second default point failure；
If caused by the described first default point failure at sensitiveness load access point to fall amplitude pre- more than described second
Set up an office and fall amplitude at sensitiveness load access point caused by failure, then makeWith
If the amplitude of falling caused by the described first default point failure at sensitiveness load access point is not more than described second
Fall amplitude at sensitiveness load access point caused by default point failure, then makeWith
Judge that whether the 4th preset subtracts the poor absolute value of the 3rd preset less than pre-set tolerance；
If the poor absolute value that the 4th preset subtracts the 3rd preset is less than pre-set tolerance, iteration is whole
Only, obtain the maximum at the corresponding sensitiveness load access point of the current failure circuit and fall amplitude；Wherein, the current event
Maximum at the corresponding sensitiveness load access point of barrier circuit falls amplitude and is
If the poor absolute value that the 4th preset subtracts the 3rd preset is not less than pre-set tolerance, institute is performed
State by the corresponding voltage equation of the current failure circuit, calculate falling for first preset and second preset
The step of amplitude.
Wherein, according to the first quadratic interpolation equation root, the step of calculating the first critical point using secant iterative method can be with
Including：
According to the first quadratic interpolation equation root, the first initial point and the second initial point are determined；Wherein, the first initial point and
Second initial point is respectively the different points on current failure circuit, and with the distance of the first quadratic interpolation equation root be less than away from
From threshold value；
Pass throughDetermine the estimation point of current failure circuit；Wherein,For estimation point,WithRespectively the first initial point and the second initial point,WithRespectively first
Fall amplitude at sensitiveness load access point caused by initial point and the second initial point failure；
Judge to estimate caused by point failure at sensitiveness load access point fall amplitude subtract voltage threshold difference whether
Less than predetermined tolerance；
If it is not, then makingExecution passes throughIt is determined that estimation
The step of point；
If so, then estimation point is the first critical point.
It is understood that for sensitiveness load caused by the head-end and tail end point failure using current failure circuit
Fall width at sensitiveness load access point caused by the middle point failure for falling amplitude and current failure circuit at access point
First quadratic interpolation equation of value (| f (0.5) |) construction and the head-end and tail end point failure using current failure circuit cause
Sensitiveness load access point at the specific configuration for falling amplitude and maximum the second quadratic interpolation equation for falling amplitude construction
Process and solution procedure, can be by the way of similar to prior art, and the present embodiment is unrestricted to this.
It should be noted that for according to the second quadratic interpolation equation root, calculating second using secant iterative method critical
The process of point, can be used with according to the first quadratic interpolation equation root, the step of the first critical point is calculated using secant iterative method
Rapid similar mode, obtains corresponding two points of the second critical point.
It should be noted that the purpose of the present embodiment is to obtain the corresponding weakness zone of every faulty line, for
, can be complete by judging whether to have determined that it is determined that after the corresponding weakness zone of current failure circuit for current failure circuit
The step of portion's faulty line corresponding weakness zone, it is ensured that the purpose of the present embodiment can be reached.It is corresponding, if not determining whole
The corresponding weakness zone of faulty line, then select next faulty line as current failure circuit, determines the current failure circuit
Corresponding weakness zone.The present embodiment does not do any limitation to this.
In the present embodiment, the embodiment of the present invention passes through the fault type of every faulty line according to acquisition, selection correspondence
Voltage equation, falling at sensitiveness load access point caused by upper any point failure of every faulty line can be calculated
Amplitude；By calculating the corresponding vulnerability indicator vector of every faulty line, the critical point of every faulty line can be obtained
Quantity；The corresponding weakness zone of every faulty line is determined by using Fibonacci method and/or secant iterative method, it is possible to use
The mixed method of Fibonacci method and secant iterative method, calculates critical point, so that it is determined that weakness zone temporarily drops in line voltage so that
Computing is less and with higher reference confidence level, can be effectively used for power system voltage and temporarily drop Performance Evaluation analysis, right
The high-quality production and operation of vast power customer are significant.
Fig. 2 is refer to, the device for identifying of weakness zone temporarily drops in a kind of line voltage that Fig. 2 is provided by the embodiment of the present invention
Structure chart.The device can include：
Selecting module 100, for the fault type of every faulty line according to acquisition, selects corresponding voltage equation；
Wherein, voltage equation is for calculating on corresponding faulty line caused by the failure of any point at sensitiveness load access point
Fall amplitude；
Computing module 200, head-end and tail end point failure for solving every faulty line according to the voltage equation
Fall amplitude at caused sensitiveness load access point, and calculate the corresponding vulnerability indicator vector of every faulty line；Its
In, the numerical value of the vulnerability indicator vector is the relation of corresponding faulty line and weakness zone；
Determining module 300, for the numerical value according to vulnerability indicator vector, utilizes Fibonacci method and/or secant iteration
Method determines the corresponding weakness zone of every faulty line.
Optionally, the device can also include：
Voltage before tidal current analysis module, the failure for calculating every faulty line by tidal current analysis；
Acquisition module, the order impedance matrix for obtaining every faulty line using sequence admittance matrix.
In the present embodiment, the embodiment of the present invention passes through failure classes of the selecting module 100 according to every faulty line of acquisition
Type, selects corresponding voltage equation, upper any point failure of every faulty line can be calculated caused by sensitiveness load connect
Fall amplitude at access point；The corresponding vulnerability indicator vector of every faulty line is calculated by computing module 200, can be obtained
The quantity of the critical point of every faulty line；Determined by determining module 300 using Fibonacci method and/or secant iterative method every
The corresponding weakness zone of bar faulty line, it is possible to use the mixed method of Fibonacci method and secant iterative method, calculates critical point,
So that it is determined that weakness zone temporarily drops in line voltage so that computing is less and with higher reference confidence level, can effectively use
Performance Evaluation analysis temporarily drops in power system voltage, and the high-quality production and operation to vast power customer are significant.
The embodiment of each in specification is described by the way of progressive, and what each embodiment was stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes the composition and step of each example according to function in the above description.These
Function is performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
Directly it can be held with reference to the step of the method or algorithm that the embodiments described herein is described with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The discrimination method and device for temporarily dropping weakness zone to line voltage provided by the present invention above have carried out detailed Jie
Continue.Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is only
It is the method and its core concept for being used to help understand the present invention.It should be pointed out that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these improve and repaiied
Decorations are also fallen into the protection domain of the claims in the present invention.
Claims (10)
1. the discrimination method of weakness zone temporarily drops in a kind of line voltage, it is characterised in that including：
According to the fault type of every of acquisition faulty line, corresponding voltage equation is selected；Wherein, the voltage equation is use
Fall amplitude at sensitiveness load access point caused by the failure of any point on corresponding faulty line in calculating；
The sensitiveness load access according to caused by the voltage equation solves the head-end and tail end point failure of every faulty line
Fall amplitude at point, and calculate the corresponding vulnerability indicator vector of every faulty line；Wherein, the vulnerability indicator vector
Numerical value for corresponding faulty line and weakness zone relation；
According to the numerical value of the vulnerability indicator vector, every fault wire is determined using Fibonacci method and/or secant iterative method
The corresponding weakness zone in road.
2. the discrimination method of weakness zone temporarily drops in line voltage according to claim 1, it is characterised in that described according to institute
State voltage equation and solve falling at sensitiveness load access point caused by the head-end and tail end point failure of every faulty line
Amplitude, and before calculating the corresponding vulnerability indicator vector of every faulty line, in addition to：
Voltage before the failure of every faulty line is calculated by tidal current analysis；
The order impedance matrix of every faulty line is obtained using sequence admittance matrix.
3. the discrimination method of weakness zone temporarily drops in line voltage according to claim 2, it is characterised in that the basis is obtained
The fault type of the every faulty line taken, selects corresponding voltage equation, including：
If the fault type of the current failure circuit obtained is A phase singlephase earth faults, the voltage equation selected is：With
Wherein, s is the sensitiveness load access point of the current failure circuit,WithRespectively described current event
The phase voltage amplitude of A phases, B phases and C phases at the s points of barrier circuit,Before the failure at the s points of the current failure circuit
Voltage；A=ej120°For complex operator,For the sequence electricity before the failure at the abort situation K points of the current failure circuit
Pressure；WithPositive and negative and zero sequence mutual impedance between the s points and K points of respectively described current failure circuit；WithPositive and negative and zero sequence self-impedance at the K points of respectively described current failure circuit；
If the fault type of the current failure circuit is the two-phase short-circuit fault of B phases and C phases, the voltage equation selected is：With
If the fault type of the current failure circuit is the line to line fault earth fault of B phases and C phases, the voltage equation selected
For：
With
If the fault type of the current failure circuit is three phase short circuit fault, the voltage equation selected is：Wherein,For the phase voltage amplitude at the s points of the current failure circuit.
4. the discrimination method of weakness zone temporarily drops in line voltage according to claim 3, it is characterised in that described according to institute
State voltage equation and solve falling at sensitiveness load access point caused by the head-end and tail end point failure of every faulty line
Amplitude, and the corresponding vulnerability indicator vector of every faulty line is calculated, including：
According to the corresponding voltage equation of the current failure circuit, head-end and the tail point event of the current failure circuit are solved
Fall amplitude at sensitiveness load access point caused by barrier；Wherein, if the corresponding voltage equation of the current failure circuit is
The voltage equation of three phase short circuit fault, then caused by the head end point failure of the current failure circuit at sensitiveness load access point
Fall amplitude | f (Fi) | and falling at sensitiveness load access point caused by the tail end point failure of the current failure circuit
Amplitude | f (Ti) | it is respectivelyWithIf the corresponding voltage equation of the current failure circuit is not three-phase shortcircuit
The voltage equation of failure, then | f (Fi) | it isWithIn minimum value, | f (Ti) | it isWithIn minimum value, i be the current failure circuit, FiFor the head of the current failure circuit
End points, TiFor the tail point of the current failure circuit；
Using falling width at sensitiveness load access point caused by the head-end and tail end point failure of the current failure circuit
Difference and 0 comparison of voltage threshold is individually subtracted in value, determines the head-end of the current failure circuit and the vulnerability of tail point
Index vector is 0 or 1；Wherein, the vulnerability index vector of the head-end of the current failure circuitThe vulnerability index vector of the tail point of the current failure circuitVthFor the voltage threshold；
By the head-end of the current failure circuit and the vulnerability index vector addition of tail point, the current failure line is determined
The vulnerability indicator vector on road；Wherein, the vulnerability indicator vector of the current failure circuit
5. the discrimination method of weakness zone temporarily drops in line voltage according to claim 4, it is characterised in that described according to institute
The numerical value of vulnerability indicator vector is stated, determines that every faulty line is corresponding thin using Fibonacci method and/or secant iterative method
Weak-strong test, including：
If the numerical value of the vulnerability indicator vector of the current failure circuit is 0, institute is not included in the current failure circuit
State weakness zone；
If the numerical value of the vulnerability indicator vector of the current failure circuit is 1, the head end of the current failure circuit is utilized
The amplitude of falling of the intermediate point for falling amplitude and the current failure circuit of point and tail point constructs the first quadratic interpolation equation,
And according to the first quadratic interpolation equation root, the first critical point is calculated using the secant iterative method, determine described current
The weakness zone included in faulty line；Wherein, the quantity of the first quadratic interpolation equation root is 1, described first
The quantity of critical point is 1；
If the numerical value of the vulnerability indicator vector of the current failure circuit is 1, solved using the Fibonacci method described
The corresponding voltage equation of current failure circuit, is obtained at the corresponding sensitiveness load access point of the current failure circuit most
It is big to fall amplitude, and judge that the maximum falls whether amplitude is more than the voltage threshold；
If so, then the current failure circuit is the weakness zone；
If it is not, using the current failure circuit head-end and tail point fall amplitude and the maximum falls amplitude construction
Second quadratic interpolation equation, and according to the second quadratic interpolation equation root, calculate second using the secant iterative method and face
Boundary's point, determines the weakness zone included in the current failure circuit；Wherein, the second quadratic interpolation equation root
Quantity is 2, and the quantity of second critical point is 2.
6. the discrimination method of weakness zone temporarily drops in line voltage according to claim 5, it is characterised in that the utilization institute
State Fibonacci method and solve the corresponding voltage equation of the current failure circuit, obtain the corresponding quick of the current failure circuit
Maximum at inductive load access point falls amplitude, including：
The first preset and the second preset of the current failure circuit are determined according to golden ratio formula；Wherein, the Huang
Golden ratio formula isFirst preset isDescribed second presets
Put and be For the 3rd preset of the current failure circuit,For the current failure
4th preset of circuit；
By the corresponding voltage equation of the current failure circuit, first preset and the second default point failure are calculated
Fall amplitude at caused sensitiveness load access point；Wherein, if the corresponding voltage equation of the current failure circuit is three
The voltage equation of phase short trouble, then fall amplitude caused by the described first default point failure at sensitiveness load access pointPreset with described second and fall amplitude at sensitiveness load access point caused by point failureRespectivelyWithIf the corresponding voltage equation of the current failure circuit is not the voltage equation of three phase short circuit fault,For WithIn minimum value,ForWithIn
Minimum value；
Judge to fall whether amplitude is more than described second at sensitiveness load access point caused by the described first default point failure
Fall amplitude at sensitiveness load access point caused by default point failure；
If falling amplitude more than second preset at sensitiveness load access point caused by the described first default point failure
Fall amplitude at sensitiveness load access point caused by failure, then makeWith
If the amplitude of falling caused by the described first default point failure at sensitiveness load access point is not more than described second and preset
Fall amplitude at sensitiveness load access point caused by point failure, then makeWith
Judge that whether the 4th preset subtracts the poor absolute value of the 3rd preset less than pre-set tolerance；
If the poor absolute value that the 4th preset subtracts the 3rd preset is less than pre-set tolerance, iteration ends are obtained
The maximum at the corresponding sensitiveness load access point of the current failure circuit is taken to fall amplitude；Wherein, the current failure line
Maximum at the corresponding sensitiveness load access point in road falls amplitude and is
If the poor absolute value that the 4th preset subtracts the 3rd preset is not less than pre-set tolerance, perform described logical
Cross the corresponding voltage equation of the current failure circuit, calculate first preset and second preset falls amplitude
The step of.
7. the discrimination method of weakness zone temporarily drops in line voltage according to claim 6, it is characterised in that described according to institute
The first quadratic interpolation equation root is stated, the first critical point is calculated using the secant iterative method, including：
According to the first quadratic interpolation equation root, the first initial point and the second initial point are determined；Wherein, described first is initial
Point and second initial point are respectively different points on the current failure circuit, and with the first quadratic interpolation equation
Root distance be less than distance threshold；
Pass throughDetermine the estimation point of the current failure circuit；Wherein,For the estimation point,WithRespectively described first initial point and second initial point,WithFalling at sensitiveness load access point caused by respectively described first initial point and the second initial point failure
Amplitude；
Judge to fall the difference that amplitude subtracts the voltage threshold at sensitiveness load access point caused by the estimation point failure
Whether predetermined tolerance is less than；
If it is not, then makingPass through described in performingIt is determined that estimation
The step of point；
If so, then the estimation point is first critical point.
8. the discrimination method of weakness zone temporarily drops in the line voltage according to any one of claim 1 to 7, it is characterised in that
The numerical value according to the vulnerability indicator vector, every fault wire is determined using Fibonacci method and/or secant iterative method
Before the corresponding weakness zone in road, in addition to：
Store the corresponding relation of every faulty line and corresponding voltage equation and the head-end of every faulty line and tail point
Fall amplitude at sensitiveness load access point caused by failure.
9. the device for identifying of weakness zone temporarily drops in a kind of line voltage, it is characterised in that including：
Selecting module, for the fault type of every faulty line according to acquisition, selects corresponding voltage equation；Wherein, institute
It is for calculating falling at sensitiveness load access point caused by the failure of any point on corresponding faulty line to state voltage equation
Fall amplitude；
Computing module, for quick caused by solving the head-end and tail end point failure of every faulty line according to the voltage equation
Fall amplitude at inductive load access point, and calculate the corresponding vulnerability indicator vector of every faulty line；Wherein, it is described thin
The numerical value of weak property indicator vector is the relation of corresponding faulty line and weakness zone；
Determining module, it is true using Fibonacci method and/or secant iterative method for the numerical value according to the vulnerability indicator vector
The corresponding weakness zone of fixed every faulty line.
10. the device for identifying of weakness zone temporarily drops in line voltage according to claim 9, it is characterised in that also include：
Voltage before tidal current analysis module, the failure for calculating every faulty line by tidal current analysis；
Acquisition module, the order impedance matrix for obtaining every faulty line using sequence admittance matrix.
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