CN109324269A - Power distribution network single-phase disconnection fault identification method based on distributed measurement - Google Patents
Power distribution network single-phase disconnection fault identification method based on distributed measurement Download PDFInfo
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- CN109324269A CN109324269A CN201811545634.XA CN201811545634A CN109324269A CN 109324269 A CN109324269 A CN 109324269A CN 201811545634 A CN201811545634 A CN 201811545634A CN 109324269 A CN109324269 A CN 109324269A
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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
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a kind of power distribution network single-phase disconnection fault identification method based on distributed measurement, recognizes single-phase wire break failure based on the relationship between load side voltage three-phase phase.This method comprises: step S1: using Wide Area Measurement System, keep monitoring on-line to power distribution network；Step S2: detecting when breaking down, and whether Judging fault is otherwise singlephase earth fault or single-phase wire break failure if it is, entering step S3 terminate fault identification；Step S3: using the distributed measurement device in Wide Area Measurement System, three-phase voltage data of the fault point far from bus one end of synchronous acquisition failure t moment, and collected three-phase voltage data is stored；Step S4: utilizing stored three-phase voltage data, calculates angle value θ of the sum of the voltage vector of two-phase not broken down in three-phase between the voltage vector of failure phase；Whether and step S5: being single-phase wire break failure based on angle value θ identification of defective.
Description
Technical field
The present invention relates to distribution network line fault discrimination methods, and in particular to a kind of power distribution network list based on distributed measurement
Phase disconnection fault discrimination method.
Background technique
Power distribution network is connected directly with user, is the important component of electric system, the electricity consumption of operating status and user
Quality and personal safety are directly related.After power distribution network single-phase disconnection failure occurs, fault down stream load-side three-phase voltage occurs bright
Aobvious energy imbalance leads to the three-phases power-equipment phase-deficient operation such as motor, finally burns because of fever, cause serious warp
Ji loss.While ground fault is often accompanied by when the generation of single-phase wire break failure, in this complex grounding fault with interruption and power distribution network
Common singlephase earth fault is different, it is most likely that leads to the safety accidents such as people and animals get an electric shock, mountain forest is caught fire, has very high danger
Property, grave danger is caused safely to the people's lives and property.
Although utilizing the voltage of single-phase wire break failure, electric current spy currently, being absorbed in power distribution network there are many scholar
Sign carries out fault identification, if Shandong University scholar is under study for action to the three-phase of the single-phase wire break failure under three kinds of different Groundings
Sequence voltage, sequence electric current have carried out more detailed analysis, propose using positive and negative sequence electric current and its variable quantity as single-phase wire break event
Hinder the criterion of identification, but deficiency is considered to the Standard resistance range of ground connection transition resistance, practical identification effect is undesirable.
China in a manner of small current neutral grounding based on power distribution network in, since single-phase wire break failure and singlephase earth fault exist
The electric characteristic of source side is quite similar, is difficult to carry out fault identification with traditional centralized measuring device, power distribution network is single-phase
Disconnection fault may continue to remain operational a few hours after occurring, and seriously threaten the safe and reliable operation of power distribution network.Although single-phase disconnected
Line failure and singlephase earth fault have the source side electric characteristic for being difficult to differentiate, but both failures but have in load-side
Different voltage characteristics.According to this feature, for the fault message for obtaining load fault side, based on Wide Area Measurement System (WAMS,
Wide Area Measurement System) distributed measurement is carried out to power distribution network, and fault identification is carried out on this basis.
WAMS provides accurate markers by global positioning system (GPS), obtain high sampling rate, high-precision electric current, voltage with
And frequency signal, it is obtained with phasor, the characteristic of synchronous acquisition and generating date, can be widely used for the whole network operational monitoring
Control, locality protection control, the every field such as fault diagnosis and pollution sources positioning.
WAMS uses synchronous phase angle measuring technique, and phasor measurement unit (PMU) is arranged in the crucial monitoring point of power grid, real
Now to the synchronous acquisition of the whole network phasor.PMU is by the synchronous clock synchronization of GPS technology, and target information is sent to master station when will have,
Dispatcher monitors the operating status of power grid in real time according to synchronizing information.WAMS system is widely used in POWER SYSTEM STATE and estimates
Meter, power grid transient state and the multiple high grades operation such as stable state control, relay protection and automation control, fault diagnosis and fault location divide
Among analysis.Before and after foreign countries start from nineteen ninety for the research of WAMS, the country such as the U.S., Spain is successively for WAMS system
Synchronous measure, field application etc. are studied；China starts from 2000 for WAMS systematic research, Research Emphasis
Pay close attention to the design and use of phasor measurement unit.
On the basis of WAMS, detection point can be carried out to fault down stream load side voltage by distributed measurement device
Analysis, and fault identification is carried out to single-phase wire break failure on this basis, to solve single-phase wire break fault identification in current power distribution network
Difficult problem.
Summary of the invention
The present invention mainly discloses a kind of to be synchronized using three-phase voltage of the Wide Area Measurement System to fault down stream load-side
Measurement, and calculating analysis is carried out to the phase relation of load-side three-phase voltage, it has obtained a kind of based on three-phase voltage vector angle
The single-phase wire break fault identification method of relationship.
A kind of power distribution network single-phase disconnection fault identification method based on distributed measurement provided by the present invention, feature exist
In: the power distribution network single-phase disconnection fault identification method based on distributed measurement is based between load side voltage three-phase phase
Relationship recognizes single-phase wire break failure.
Preferably, the power distribution network single-phase disconnection fault identification method based on distributed measurement includes:
Step S1: using Wide Area Measurement System, keeps monitoring on-line to power distribution network；
Step S2: detect whether Judging fault is in singlephase earth fault or single-phase wire break failure when breaking down
It is any, if it is, otherwise terminating fault identification into following step S3；
Step S3: using the distributed measurement device in Wide Area Measurement System, the fault point of synchronous acquisition failure t moment is remote
Three-phase voltage data from bus one end, and collected three-phase voltage data is stored；
Step S4: utilizing stored three-phase voltage data, calculates the voltage vector for the two-phase not broken down in three-phase
The sum of angle value θ between the voltage vector of failure phase；And
Step S5: recognize whether the failure is single-phase wire break failure based on angle value θ.
Preferably, in step s 2, when detecting that failure occurs, the collected electricity of the Wide Area Measurement System is utilized
Pressure, current data, according to D type traveling wave localization method to failure carry out section positioning, then using symmetrical component method obtain positive sequence,
Negative phase-sequence, residual voltage and/or current data, and according to the boundary condition Judging fault of singlephase earth fault and single-phase wire break failure
It whether is singlephase earth fault or single-phase wire break failure.
Preferably, in step s 2, the singlephase earth fault and the boundary condition of single-phase wire break failure are: zero after failure
Sequence electric current is not zero, and forward-order current and negative-sequence current are respectively less than the electric current before failure after failure.
Preferably, in step s3, pass through distributed measurement device measure simultaneously the voltage of load-side Three-Phase Transformer to
Amount.
Preferably, in step s 4, the sum of the voltage vector of two-phase not broken down in three-phase is calculated by following formula
Angle value θ between the voltage vector of failure phase:
Wherein, x1For the abscissa of the sum of the voltage vector of two-phase that does not break down, x2For the voltage vector of failure phase
Abscissa, y1For the ordinate of the sum of the voltage vector of two-phase that does not break down, y2For the vertical seat of the voltage vector of failure phase
Mark.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, before failure definition
The voltage vector coordinate value of a phase is (0,1) in the two-phase not broken down, and using place straight line as y-axis, and vertical y-axis is made
For x-axis, coordinate system is established, and the calculating of following institute's directed quantity is calculated all in accordance with this coordinate system, according to formula UAL=EA+UNOWith
UBL=EB+UNOCalculate the coordinate (x of the sum of voltage vector of two-phase not broken down1,y1), wherein UNOIt is system neutral electricity
Pressure, UALIt is the voltage vector of a phase in the two-phase not broken down, EAIt is the failure of a phase described in the two-phase that does not break down
Preceding system power supply side voltage, UBLIt is the voltage vector of another phase in the two-phase not broken down, EBIt is the two-phase not broken down
Described in another phase failure before system power supply side voltage；The voltage vector of failure phase is calculated according to the following formula, and is converted to above-mentioned
Coordinate (x in established coordinate system2,y2):
Wherein, UCLIt is the voltage vector of failure phase, R0To be grounded transition resistance, ZKIt is equivalent impedance, UIAAnd UIBIt is respectively
Input voltage of two phase lines not broken down to transformer, UICIt is input voltage of the failure phase line to transformer.
Preferably, in step s 4, by assuming that line-to-ground distribution capacity C=4*10-7(F), total conductance YK=2*j ω
C, equivalent impedance Zk=500 (Ω), in different R0It is worth (0 < R0< 10000) it under the conditions of, is calculated in the system by following formula (4)
Property point voltage UNO:
Wherein, ECIt is system power supply side voltage, Y before the failure of any phase in three-phaseKBe with the total conductance of three-phase system, C is three
The line-to-ground distribution capacity of any phase, R in phase0To be grounded transition resistance.
Preferably, in above-mentioned formula (7), for Y-Y type transformer, ZK=2Z, wherein Z is any of three-phase windings
Resistance value.
Preferably, in above-mentioned formula (7), for Δ-Y type transformer, ZK=(2/3) Z, wherein Z is appointed in three-phase windings
One resistance value.
Preferably, in step s 4, also utilize matlab software to angle value θ with log10(R0) form indicate connect
Ground transition resistance R0Situation of change calculated.
Preferably, by 0 < R0Difference R in < 10000 ranges0Angle value θ under the conditions of value is with log10(R0) form expression
Ground connection transition resistance R0Situation of change drawn to indicate situation of change.
Preferably, in step s 5, when θ >=threshold θkWhen, it is determined as singlephase earth fault, when θ < threshold θkWhen, then determine
For single-phase wire break failure.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, the threshold θk
It is 10 °.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, the threshold θk
It is 8 °.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, when the angle
Value θ is consistently greater than 10 ° and with log10(R0) form indicate ground connection transition resistance R0Increase and when increasing, determine to occur
Singlephase earth fault.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, when the angle
When value θ is consistently equal to zero, determine that single-phase wire break failure occurs.
Relative to traditional discrimination method, the application is to the power supply under different Groundings, different ground connection transition resistance resistance values
Side, load-side equivalent-circuit model have carried out analytical calculation, the fault identification method obtained have preferable identification precision and
The wide scope of application proposes a kind of feasible effective new departure to solve power distribution network single-phase disconnection fault identification problem.
Detailed description of the invention
Fig. 1 is the figure for schematically showing single-phase-to-ground fault equivalent circuit.
Fig. 2 is the figure for schematically showing Y-Y type transformer equivalent circuit.
Fig. 3 is the figure for schematically showing Δ-Y type transformer equivalent circuit.
Fig. 4 is the figure for schematically showing singlephase earth fault load side voltage vector.
Fig. 5 is the figure for schematically showing single-phase wire break load fault side voltage vector.
Fig. 6 shows angle value θ and ground connection transition resistance R0The figure of relationship.
Fig. 7 is the figure for schematically showing the single loop line distribution network line emulation topological structure established in embodiment.
Fig. 8 (a) to Fig. 8 (c) is the θ-R for showing three groups of simulated faults in embodiment0The figure of relationship, wherein Fig. 8 (a) is figure
Corresponding θ-the R of route 5-6 failure in 70The figure of relationship；Fig. 8 (b) is the corresponding θ-R of route 2-3 failure in Fig. 70The figure of relationship；Figure
8 (c) be the corresponding θ-R of route 12-13 failure0The figure of relationship.
Specific embodiment
With reference to the accompanying drawing, presently preferred embodiments of the present invention is provided, and is described in detail.
When singlephase earth fault occurs, it is assumed that failure is mutually C phase, then the equivalent circuit of system is as shown in Figure 1.Wherein N
For system neutral, EA、EB、ECSystem power supply side voltage, C respectively before A, B, C phase faultA、CB、CCRespectively A, B, C phase line
Road distribution capacity over the ground, YKA、YKB、YKCRespectively and CA、CB、CCConductance over the ground on the right side of system in parallel, R0To be grounded transition
Resistance.
If post-fault system neutral point voltage is UNO, then according to system neutral voltage computing formula, have:
In formula (1): YA、YB、YCRespectively A, B, C relatively conductance summation.
According to the equivalent circuit of Fig. 1, each relatively conductance summation Y can be calculatedA、YB、YC:
Assume that the line properties of system three-phase are consistent simultaneously, it may be assumed that
Convolution (1), (2) and (3), obtains the neutral point voltage expression formula of system:
Common distribution transformer has Y-Y type and two kinds of modes of connection of Δ-Y type.
For Y-Y type transformer, equivalent circuit is as shown in Fig. 2, wherein UIA、UIB、UICRespectively A, B, C three-phase line
To the three-phase input voltage of transformer；CA、CB、CCThe respectively distribution capacity over the ground of three-phase line；ZA、ZB、ZCRespectively transformation
The three-phase windings resistance value of device；R0To be grounded transition resistance.
Due to distribution network line distribution capacity C over the groundA、CB、CCVery little, the impedance to be converted according to formula 1/j ω C are remote
Much larger than the impedance Z of the three-phase windings of transformerA、ZB、ZCWith ground connection transition resistance R0.Therefore in this case to transformer
Equivalent circuit can be ignored when being calculated by CA、CBThe electric current for flowing into the earth, is regarded as open circuit, and R0With CCIt is in parallel
Impedance value can be considered as R0.Assume that Three-Phase Transformer winding is symmetrical simultaneously, i.e. three-phase windings resistance value ZA=ZB=ZC=Z1.To Fig. 2
Circuit calculated, obtain Y-Y type transformer C phase (that is, failure phase) primary side voltage value UCL:
Then similar analytical calculation is carried out to Δ-Y type transformer (its equivalent circuit is as shown in Figure 3).U in figureIA、UIB、
UICRespectively three-phase input voltage of A, B, C three-phase line to transformer, CA、CB、CCThe respectively electricity of distribution over the ground of three-phase line
Hold, ZAB、ZBC、ZACThe respectively three-phase windings of transformer；R0To be grounded transition resistance.Similarly ignore distribution line to be distributed over the ground
The influence of capacitor, and three-phase windings resistance value ZAB=ZBC=ZCA=Z2.It is primary to obtain Δ-Y type transformer C phase (that is, failure phase)
Side voltage value UCL:
By the way that formula (5) is denoted as equivalent impedance Z to item relevant with winding impedance in formula (6)k, can be by formula (5) and formula
(6) it is unified for following form, as faulted phase voltage vector UCLExpression formula:
And for single-phase wire break failure, the voltage analysis process of load-side and the basic holding one of singlephase earth fault
It causes, only because the influence of broken string, the input voltage U of C phaseICBecome 0.Therefore formula (7) is modified slightly, load-side change can be obtained
Depressor C phase (that is, failure phase) primary side voltage value UCLExpression formula:
For singlephase earth fault, it is assumed that C phase (that is, failure phase) input voltage UICEqual to the C phase voltage of source side, and base
Remember in formula (7)For Uk, then UkVector always with (UIA+UIB) vector direction is identical.It therefore deduces that
The voltage vector diagram of load-side as shown in Figure 4.
And for single-phase wire break failure, the input voltage U of C phaseICBecome 0.Based on formula (8), single-phase wire break failure is born
It carries side and carries out vector diagram analysis, as shown in Figure 5.
By comparison diagram 4 and Fig. 5 it is found that for singlephase earth fault, C phase measures after failure voltage UCLFor UICWith Uk
Vector sum, vector direction is (that is, UCLPhase) and UICAnd UkAmplitude phase it is directly related.Therefore, with system parameter
With the variation of failure occurrence condition, the load-side fault phase voltage U of singlephase earth faultCLPhase and amplitude can all have significantly
Variation.And for single-phase wire break failure, no matter the parameter Z in formula (8)KWith R0How to change, the load-side electricity of single-phase wire break failure
Press UCLVector always with (UIA+UIB) vector direction is identical.Therefore, system parameter and failure occurrence condition are to this phase relation
Substantially it does not influence.That is, being recognized using the relationship between load side voltage three-phase phase to single-phase wire break failure
It is a kind of feasible effective thinking.
Pass through the comparative analysis to false voltage feature, it can be deduced that carry out using failure back loading side transformer voltage single
One basic ideas of phase disconnection fault and the fault identification of singlephase earth fault: assuming that C phase is failure phase, while passing through distribution
The three-phase voltage vector U of formula measuring device measurement load-side transformerAL、UBLAnd UCL, calculate the two-phase not broken down in three-phase
The sum of vector (UAL+UBL) and failure phase vector UCLBetween angle value θ, and set a threshold θk.As θ < θkWhen, determine event
Barrier is single-phase wire break failure, is otherwise determined as singlephase earth fault.
In theory, the angle theta of single-phase wire break failure is consistently equal to zero, therefore only needs the folder to singlephase earth fault
Angle θ carries out analysis can threshold value θkReasonable value.Assuming that line-to-ground distribution capacity C=4*10-7(F), total conductance YK=
2*j ω C, equivalent impedance Zk=500 (Ω), using matlab software to the angle theta of singlephase earth fault with ground connection transition electricity
Hinder R0(with log10(R0) form indicate) situation of change calculated.
Specifically, in different R in matlab software0It is worth (0 < R0< 10000) it under the conditions of, according to formula (4), calculates and is
Unite neutral point voltage UNO, then according to formula UAL=EA+UNOWith UBL=EB+UNOCalculate outgoing vector (UAL+UBL) coordinate (x1,
y1), then U is calculated according to formula (7) aboveCLThe coordinate (x2, y2) of vector, finally (9) calculate angle according to the following formula
Value θ.
Wherein, x1For the abscissa of the sum of the voltage vector of two-phase that breaks down；x2For the cross of the voltage vector of failure phase
Coordinate；y1For the ordinate of the sum of the voltage vector of two-phase that breaks down；y2For the ordinate of the voltage vector of failure phase.
By different R0It is worth (0 < R0< 10000) the angle value θ under the conditions of is with angle value θ with ground connection transition resistance R0(with
log10(R0) form indicate) situation of change carry out drawing expression, as a result as shown in Figure 6.
From fig. 6, it can be seen that for general power distribution network, after singlephase earth fault occurs, vector (UAL+UBL)
With UCLAngle theta be consistently greater than 10 °, and with ground connection transition resistance R0Increase and increase；And single-phase wire break event is occurring
After barrier, which is consistently equal to zero.In view of the influence of the factors such as measurement error, by threshold θk8 ° are set as to differentiate to increase
Accuracy.
Therefore, based on above-mentioned analysis, the present invention provides a kind of power distribution network single-phase disconnection failure based on distributed measurement and distinguishes
Knowledge method recognizes single-phase wire break failure based on the relationship between load side voltage three-phase phase.
The above method generallys include following steps:
Step S1: using Wide Area Measurement System, keeps monitoring on-line to power distribution network；
Step S2: detect whether Judging fault is in singlephase earth fault or single-phase wire break failure when breaking down
It is any, if it is, otherwise terminating fault identification into following step S3；
Step S3: using the distributed measurement device in Wide Area Measurement System, the fault point of synchronous acquisition failure t moment is remote
Three-phase voltage data from bus one end, and collected three-phase voltage data is stored；
Step S4: utilizing stored three-phase voltage data, calculates the voltage vector for the two-phase not broken down in three-phase
The sum of angle value θ between the voltage vector of failure phase；And
Step S5: recognize whether above-mentioned failure is single-phase wire break failure based on angle value θ.
Wherein, in step s 2, when detecting that failure occurs, the collected voltage of Wide Area Measurement System, electric current are utilized
Data carry out section positioning to failure according to D type traveling wave localization method, then obtain positive sequence, negative phase-sequence, zero using symmetrical component method
Sequence voltage, current data, and whether be single-phase according to singlephase earth fault and the boundary condition Judging fault of single-phase wire break failure
Ground fault or single-phase wire break failure.
In step s3, the voltage vector of load-side Three-Phase Transformer is measured simultaneously by distributed measurement device.
In step s 4, based on the coordinate (x of the sum of the voltage vector of two-phase not broken down in three-phase1,y1) and failure
The coordinate (x2, y2) of the voltage vector of phase, calculated by following formula (9) two-phase not broken down in three-phase voltage vector it
And the angle value θ between the voltage vector of failure phase:
Wherein, x1For the abscissa of the sum of the voltage vector of two-phase that does not break down, x2For the voltage vector of failure phase
Abscissa, y1For the ordinate of the sum of the voltage vector of two-phase that does not break down, y2For the vertical seat of the voltage vector of failure phase
Mark.
In the above-mentioned methods, A phase (that is, phase in the two-phase not broken down) voltage vector is sat first before failure definition
Scale value is (0,1), and using place straight line as y-axis, vertical y-axis establishes coordinate system, and following institute's directed quantity as x-axis
Calculating is calculated all in accordance with this coordinate system.According to formula UAL=EA+UNOAnd UBL=EB+UNOCalculate the two-phase not broken down
The sum of voltage vector and the coordinate (x being converted into above-mentioned coordinate system1,y1), wherein UNOIt is system neutral voltage, UALIt is not send out
The voltage vector of a phase, E in the two-phase of raw failureAIt is the failure prior fault upstream electricity of a phase described in the two-phase that does not break down
Pressure, UBLIt is the voltage vector of another phase in the two-phase not broken down, EBIt is another phase described in the two-phase that does not break down
System power supply side voltage before failure.
In the above-mentioned methods, (7) calculate the voltage vector of failure phase according to the following formula, and are converted to above-mentioned established coordinate
Coordinate (x in system2,y2):
Wherein, UCLIt is the voltage vector of failure phase, R0To be grounded transition resistance, ZKIt is equivalent impedance, UIAAnd UIBIt is respectively
Input voltage of two phase lines not broken down to transformer, UICIt is input voltage of the failure phase line to transformer.
In step s 4, it is assumed that line-to-ground distribution capacity C=4*10-7(F), total conductance YK=2*j ω C, equivalent impedance
Zk=500 (Ω), in different R0It is worth (0 < R0< 10000) under the conditions of, pass through following formula (4) computing system neutral point voltage UNO:
Wherein, ECIt is system power supply side voltage, Y before the failure of any phase in three-phaseKIt is the route pair with phase any in three-phase
Conductance over the ground on the right side of the system of ground distribution capacity parallel connection, C are the line-to-ground distribution capacity of any phase in three-phase, R0For ground connection
Transition resistance.
In step s 4, also utilize matlab software to angle value θ with log10(R0) form indicate ground connection transition
Resistance R0Situation of change calculated.Preferably, by different R0It is worth (0 < R0< 10000) angle value θ under the conditions of with
log10(R0) form indicate ground connection transition resistance R0Situation of change drawn to indicate situation of change
Preferably, in step s 5, when θ >=threshold θkWhen, it is determined as singlephase earth fault, when θ < threshold θkWhen, then determine
For single-phase wire break failure.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, the threshold θk
It is 10 °.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, the threshold θk
It is 8 °.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, when the angle
Value θ is consistently greater than 10 ° and with log10(R0) form indicate ground connection transition resistance R0Increase and when increasing, determine to occur
Singlephase earth fault.
Preferably, in the power distribution network single-phase disconnection fault identification method described based on distributed measurement, when the angle
When value θ is consistently equal to zero, determine that single-phase wire break failure occurs.
Embodiment
The simulation model of single loop line distribution network line is established using PSCAD/EMTDC software, route voltage rating is 10kV,
Its topological diagram is as shown in Figure 7.Several groups of failures are arranged in different location in Fig. 7 distribution line, include single-phase wire break in every group of failure
Failure and singlephase earth fault.Set abort situation is located at route 5-6, route 2-3 and route 12-13 in Fig. 7
Place, the transformer primary side voltage of fault down stream measures after failure occurs.
In tri- groups of route 5-6, route 2-3, route 12-13 failures, measured downstream transformers number respectively E,
D,J.Transition resistance R is grounded by changing0(0<R0< 50000) simulated measurement (comparison of drawing for convenience, it is assumed that single-phase disconnected is carried out
The ground connection transition resistance R of line trouble power side and load-side1With R2It is equal, and with R0Indicate), for each different R0Record
According to the θ value being calculated measured by the method, and with log10(R0) form indicate R0It is ordinate for abscissa, θ, draws
Angle value θ is produced with R0The curve graph of variation, as shown in Fig. 8 (a) to Fig. 8 (c).
In FIG. 8 it is seen that three groups of failure angle thetas are with R0The common feature of variation: the angle value θ of single-phase wire break failure
Hardly follow R0Variation, is always held near 0 °；And angle the value θ and R of singlephase earth fault0Substantially it is positively correlated, and with
R0Increase ascendant trend gradually to delay.By emulating the two kinds of failure angle thetas obtained with R0Variation tendency obtained with by theoretical calculation
Result it is almost the same.
It can be seen from the figure that in the larger (log of ground resistance10(R0) > 2, i.e. R0> 100 Ω) when, single-phase wire break failure
The Threshold θ that angle theta is consistently less than as 8 °k, and single-phase wire break failure angle theta is consistently greater than 8 °.Therefore, by comparing angle
Value θ and Threshold θk, fault identification accurately can be carried out to two kinds of failures.
Applicant combines Figure of description to be described in detail and describe the embodiment of the present invention, but this field skill
Art personnel are it should be understood that above embodiments are only the preferred embodiments of the invention, and explanation is intended merely to help reader in detail
More fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any based on invention essence of the invention
Any improvement or modification made by mind should all be fallen within the scope and spirit of the invention.
Claims (17)
1. a kind of power distribution network single-phase disconnection fault identification method based on distributed measurement, it is characterised in that: described based on distribution
The power distribution network single-phase disconnection fault identification method of formula measurement is based on the relationship between load side voltage three-phase phase to single-phase wire break
Failure is recognized.
2. the power distribution network single-phase disconnection fault identification method according to claim 1 based on distributed measurement, feature exist
In:
The power distribution network single-phase disconnection fault identification method based on distributed measurement includes:
Step S1: using Wide Area Measurement System, keeps monitoring on-line to power distribution network；
Step S2: detecting when breaking down, and whether Judging fault is any in singlephase earth fault or single-phase wire break failure
Kind, if it is, otherwise terminating fault identification into following step S3；
Step S3: using the distributed measurement device in Wide Area Measurement System, the fault point of synchronous acquisition failure t moment is far from female
The three-phase voltage data of line one end, and collected three-phase voltage data is stored；
Step S4: utilizing stored three-phase voltage data, calculates the sum of the voltage vector of two-phase not broken down in three-phase
Angle value θ between the voltage vector of failure phase；
Step S5: recognize whether the failure is single-phase wire break failure based on the angle value θ.
3. the power distribution network single-phase disconnection fault identification method according to claim 2 based on distributed measurement, feature exist
In:
In step s 2, it when detecting that failure occurs, using the collected voltage of the Wide Area Measurement System, current data, presses
According to D type traveling wave localization method to failure carry out section positioning, then using symmetrical component method obtain positive sequence, negative phase-sequence, residual voltage,
Current data, and whether be singlephase earth fault according to the boundary condition Judging fault of singlephase earth fault and single-phase wire break failure
Or single-phase wire break failure.
4. the power distribution network single-phase disconnection fault identification method according to claim 3 based on distributed measurement, feature exist
In:
The singlephase earth fault and the boundary condition of single-phase wire break failure are: zero-sequence current is not zero after failure, and after failure
Forward-order current and negative-sequence current are respectively less than the electric current before failure.
5. the power distribution network single-phase disconnection fault identification method according to claim 2 based on distributed measurement, feature exist
In:
In step s3, the voltage vector of load-side Three-Phase Transformer is measured simultaneously by distributed measurement device.
6. the power distribution network single-phase disconnection fault identification method according to claim 5 based on distributed measurement, feature exist
In:
In step s 4, the electricity of the sum of voltage vector of two-phase not broken down in three-phase with failure phase is calculated by following formula
Angle value θ between the amount of pressing to:
Wherein, x1For the abscissa of the sum of the voltage vector of two-phase that does not break down, x2For the horizontal seat of the voltage vector of failure phase
Mark, y1For the ordinate of the sum of the voltage vector of two-phase that does not break down, y2For the ordinate of the voltage vector of failure phase.
7. the power distribution network single-phase disconnection fault identification method according to claim 6 based on distributed measurement, feature exist
In:
The voltage vector coordinate value of a phase is (0,1) in the two-phase not broken down before failure definition, and using place straight line as y
Axis, vertical y-axis establishes coordinate system as x-axis, and the calculating of following institute's directed quantity is calculated all in accordance with this coordinate system, is pressed
Illuminated UAL=EA+UNOAnd UBL=EB+UNOThe sum of the voltage vector of two-phase not broken down is calculated, and is converted to and establishes seat
Coordinate (x in mark system1,y1), wherein UNOIt is system neutral voltage, UALBe a phase in the two-phase not broken down voltage to
Amount, EAIt is the failure prior fault upstream voltage of a phase described in the two-phase that does not break down, UBLIt is in the two-phase not broken down
The voltage vector of another phase, EBBe another phase described in the two-phase that does not break down failure before system power supply side voltage；
The voltage vector of failure phase is calculated according to the following formula, and is converted to the coordinate (x in above-mentioned established coordinate system2,y2):
Wherein, UCLIt is the voltage vector of failure phase, R0To be grounded transition resistance, ZKIt is equivalent impedance, UIAAnd UIBIt is not send out respectively
Input voltage of two phase lines of raw failure to transformer, UICIt is input voltage of the failure phase line to transformer.
8. the power distribution network single-phase disconnection fault identification method according to claim 7 based on distributed measurement, feature exist
In:
In step s 4, in different ground connection transition resistance R0Under the conditions of value, the system neutral voltage is calculated according to the following formula
UNO:
Wherein, ECIt is system power supply side voltage, Y before the failure of any phase in three-phaseKBe with the total conductance of three-phase system, C is in three-phase
The line-to-ground distribution capacity of any phase, R0To be grounded transition resistance, effect impedance Z is the equivalent impedance of route；Wherein, 0 < R0<
10000。
9. the power distribution network single-phase disconnection fault identification method according to claim 7 or 8 based on distributed measurement, feature
It is:
For Y-Y type transformer, ZK=2Z, wherein Z is the resistance value of any of three-phase windings.
10. the power distribution network single-phase disconnection fault identification method according to claim 7 or 8 based on distributed measurement, special
Sign is:
For Δ-Y type transformer, ZK=(2/3) Z, wherein Z is the resistance value of any of three-phase windings.
11. the power distribution network single-phase disconnection fault identification method according to claim 8 based on distributed measurement, feature exist
In:
In step s 4, also utilize matlab software to angle value θ with log10(R0) form indicate ground connection transition resistance R0
Situation of change calculated.
12. the power distribution network single-phase disconnection fault identification method according to claim 8 based on distributed measurement, feature exist
In:
By 0 < R0Difference R in < 10000 ranges0Angle value θ under the conditions of value is with log10(R0) form indicate ground connection transition
Resistance R0Situation of change drawn to indicate situation of change.
13. the power distribution network single-phase disconnection fault identification method according to claim 2 based on distributed measurement, feature exist
In:
In step s 5, when θ >=threshold θkWhen, it is determined as singlephase earth fault；When θ < threshold θkWhen, then it is determined as single-phase wire break
Failure.
14. the power distribution network single-phase disconnection fault identification method according to claim 13 based on distributed measurement, feature
It is:
The threshold θkIt is 10 °.
15. the power distribution network single-phase disconnection fault identification method according to claim 13 based on distributed measurement, feature
It is:
The threshold θkIt is 8 °.
16. the power distribution network single-phase disconnection fault identification method according to claim 11 or 12 based on distributed measurement,
It is characterized in that:
When the angle value θ is consistently greater than 10 ° and with log10(R0) form indicate ground connection transition resistance R0Increase and increase
Added-time determines that singlephase earth fault occurs.
17. the power distribution network single-phase disconnection fault identification method according to claim 11 or 12 based on distributed measurement,
It is characterized in that:
When the angle value θ is consistently equal to zero, determine that single-phase wire break failure occurs.
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