CN110531222A - A kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab - Google Patents
A kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab Download PDFInfo
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- CN110531222A CN110531222A CN201910971587.3A CN201910971587A CN110531222A CN 110531222 A CN110531222 A CN 110531222A CN 201910971587 A CN201910971587 A CN 201910971587A CN 110531222 A CN110531222 A CN 110531222A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- 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
Abstract
The present invention relates to a kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab, which comprises the following steps: S1: the step of determining Fault Location Algorithm；The step of building of S2:Simulink simulation model；S3: the step of distance measurement result is analyzed.
Description
Technical field
The invention belongs to line fault analysis technical fields, and in particular to a kind of ultra-high-tension power transmission line event based on Matlab
Hinder localization method.
Background technique
Industrial-Enterprises in China quickly grew demand of the people to high-quality life in addition in recent years, network voltage grade and defeated
Capacity is sent to improve, newly-built high pressure, super-pressure and UHV transmission line increase year by year.This is reliable and stable to China's electric system
Operation has higher requirement.Ultra-high-tension power transmission line wide coverage, there may be the landform and evil of various complexity in area along the line
Bad weather condition, and ultra-high-tension power transmission line is the long line of 100km or more, and these bring greatly tired to artificial line walking
It disturbs, so that artificial line walking lookup failure is time-consuming and laborious.Fault location device will play particularly important effect in these cases.
Fault location device is also known as fault locator, is a kind of automatic device for measuring position of failure point, in route
It can be according to different fault signatures quickly and accurately fault point after failure.For permanent fault, fault location device
Use can mitigate the workload of artificial line walking, accelerate the progress of electric power safety accident maintenance, improve the stability of power supply.It is right
In as route thunderbolt, insulator chain aging, birds and beasts cross-line etc., failure destruction sign is unobvious but can make abort situation insulation ag(e)ing
Transient fault, fault locator can also with positioning failure, facilitate investigation and maintenance to avoid its development be permanent fault.
This is in place of the deficiencies in the prior art.
In view of this, the present invention provides a kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab；It is existing to solve
There is drawbacks described above present in technology, is necessary.
Summary of the invention
It is an object of the present invention in view of the above-mentioned drawbacks of the prior art, provide design it is a kind of based on Matlab's
Ultra-high-tension power transmission line Fault Locating Method, to solve the above technical problems.
To achieve the above object, the present invention provides following technical scheme:
A kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab, comprising the following steps:
S1: the step of determining Fault Location Algorithm；
According to range measurement principle, the method for fault location can be divided into fault analytical method (line parameter circuit value positioning) and traveling wave method (temporarily
State traveling wave positioning).The electrical quantity source according to needed for ranging can be divided into single end distance measurement method and double-end distance measurement method again.Compared to list
Hold-carrying ranging, both-end method utilize the electrical quantity at route both ends to realize that fault localization, the algorithm pass through the electricity that measures both ends simultaneously
Current voltage is calculated according to long-line equation to opposite end, determines abort situation further according to fault point voltage phase etc. condition, because
This can completely eliminate the influence of transition resistance and system operation mode variation to range accuracy in principle.There is no systematicness
Error makes both-end method distance measurement result better than single-ended method, so attention of the both-end distance measuring algorithm by relay protection worker, Chang Beiyong
In the fault location of long UHV transmission line.The both-end distance measuring algorithm for being based on line parameter circuit value positioning below is analyzed.
Both end power supplying system as shown in Figure 1, the A in the operation of failure presteady state, the steady state voltage electric current difference that the both ends B measure
ForThe asynchronous angle of two end datas is that δ can be obtained by long-line equation:
The nonsynchronous phase angle difference δ of two end datas can be found out by formula (1-1) and formula (1-2), it is nonsynchronous to eliminate data
It influences.
Route complete transposition is assumed according to fig. 2, and when with symmetrical component method analysis circuit failure, positive-sequence component is in any class
All exist under the failure of type, therefore can be arranged with positive sequence network and write range equation to meet the needs of different faults positioning.The end A, B
The positive sequence fault current and voltage measured be respectivelyFault point positive sequence voltage isFailure
Generation can be obtained at away from the end A x by long-line equation:
Joint type (1-3) (1-4), arrangement can obtain:
Other amounts are the known quantity of line parameter circuit value or the amount that can survey out other than fault distance x in formula (1-5), this
Sample is achieved that the positioning of failure.
The presence of positive sequence network load current makes distance measurement result will receive the influence of load current, is existed according to fault message
The characteristics of being not present under normal operating condition, only occurring in device fails, the method by introducing positive sequence fault component
Reducing load current bring influences.
Fault component is concrete embodiment of the fault message in electrical quantity.For linear system principle of stacking by failure shape
State is decomposed into non-faulting state and failure additivity.Fig. 3 is the schematic diagram of failure additivity.
The corresponding amount measured when by failure subtracts non-faulting component just and can be obtained the component under failure additivity.In reality
It may be assumed that non-faulting component is equal to component before failure in.
Therefore in Fig. 3
Have in conjunction with long-line equation:
ΔUA1 cosh(γ1x)-Zc1ΔIA1 sinh(γ1X)=Δ UB1 cosh[γ1(l-x)]-Zc1ΔIB1 sinh
[γ1(l-x)]
Arrangement can obtain:
Fault distance can be found out by formula (1-6).
The step of building of S2:Simul ink simulation model；
Simul ink is the software package for realizing Modelling of Dynamic System and emulation that MATLAB is provided, and is based on block diagram
Emulation platform.Simul ink is articulated in MATLAB environmentally, based on the powerful computing function of MATLAB, using intuitive
Module frame chart emulated and calculated.
It include power system blockset PSB since Simulink is 4.1 editions.Electric system is used under Simulink environment
The module of module library carries out the emulation such as power electronic circuit, rlc circuit, electric system and electric machine control system in which can be convenient.
The module library PSB covers electrical component and power system simulation model common in electrical engineering subject.
(1) distribution parameter long transmission line model
(2) line parameter circuit value is arranged
ZA=1.05+j43.18 Ω, ZB=1.06+j44.92 Ω
L=300km, r1=0.0208 Ω/km, l1=0.8984mH/km, C1=0.0121 μ F/km
r0=0.1148 Ω/km, l0=2.2886mH/km, C0=0.0052 μ F/km
(3) simulation parameter is arranged
Emulate time started Start time=0.0s；Dwell time Stop time=0.2s；Select variable step size
Ode23t algorithm；Frequency Frequency=50Hz；By three-phase line malfunctioning module, Conversion fault time Transition is set
Time=[0.04,0.1]；A phase ground fault is set；Sampling time Sample time=0.00001s is set in oscillograph,
Simultaneously in oscillograph by sampled data format be set as Structure with time form and by result save to
In the Workspace of MATLAB.
(4) operating parameter is arranged；Phase angle ∠ δ=- 20 °, the transition resistance RF=50 Ω of both ends power supply is set, it is single-phase
Ground fault, fault point are arranged at x=270km, operation emulation.
(5) simulation waveform and data processing；It is found within the time that emulation has just brought into operation when handling simulation waveform, three
Phase voltage, the amplitude of current waveform be unstable and harmonic content, and last distance measurement result error is also larger, enables Double-End Source system
1s is operated normally, three-phase voltage current waveform diagram is obtained, such as Fig. 5,6.
In view of needing to use the voltage and current before failure in location algorithm, in conjunction with Fig. 5,6, discovery is operated normally when system
The three-phase voltage current amplitude harmonic content that tends towards stability is also smaller when to 0.8s or so.The amendment simulation run time is 1s, failure
Occur and the moment that disappears is changed to 0.8s and 0.88s respectively.It is emulated again.A, B are measured respectively rectifies sequence voltage current amplitude
With phase angle such as Fig. 7,8,9,10.
It is available to analyze simulation waveform
(6) MATLAB program calculation
Both-end distance measuring algorithm is programmed by MATLAB, and substitutes into measured valueJust
Distance measurement result can be obtained.
" LENGTHABC=fbcsjf (1316.2*exp (i*-0.288), 821.9*exp (i*-1.45), 394510.5*
Exp (i*-1.136), 375271.9*exp (i*-0.391))
LENGTHABC=2.7011e+02+2.5812e-01i
It acquires fault distance and takes real part x=270.11km.
S3: the step of distance measurement result is analyzed；
To guarantee that range unit can use in practical situations, enough accuracys should be made it have.Accuracy can be with
It is indicated with relative error, i.e. the absolute error percentage that accounts for total track length:
The limitation of economic and technical etc. keeps range error too small.In conjunction with actual conditions, ultra-high-tension power transmission line
Failure occurs mainly at shaft tower, so the requirement to fault location device precision reaches the distance between two shaft towers,
Site requirement can preferably be met generally between 300m~600m.
Emulation data in the case of the different transition resistances of table 1
Emulation data in the case of 2 different faults point of table
Table 1 is that δ=- 20 ° of fault point of both ends power supply phase angle difference is arranged at away from the end A x=230km, different types of failure
Distance measurement result in different transition resistances.
Different types of failure is in different faults when table 2 is δ=- 20 ° of transition resistance Rf=50 Ω of both ends power supply phase angle difference
Distance measurement result in the case of point.
As can be seen from Table 1 in addition in singlephase earth fault, there is error about 2% in the case of line end high resistance ground
Outside, the range accuracy in the case of other is all very high.Table 2 reflects the both-end distance measuring algorithm based on fault component to each position of route
The different types of failure for setting generation can be accurately positioned.
Described above is specific implementation process of the invention, the invention is not limited to single Fault Location Algorithm,
Being combined with actual parameter by will change simulation model can be to the electric system under the different method of operation and environmental condition
It is analyzed, help is played to the accuracy and adaptability of verifying various location algorithms.
The beneficial effects of the present invention are quick and precisely analyze failure and position occur, improve malfunction elimination efficiency, effectively keep away
Exempting from transient fault development is permanent fault.
In addition, design principle of the present invention is reliable, structure is simple, has very extensive application prospect.
It can be seen that compared with prior art, the present invention have substantive distinguishing features outstanding and it is significant ground it is progressive, implementation
Beneficial effect be also obvious.
Detailed description of the invention
Fig. 1 Double-End Source system operates normally schematic diagram.
Fig. 2 failure positive sequence net schematic diagram.
Fig. 3 positive sequence fault component schematic diagram.
Fig. 4 distributed constant circuit simulation model schematic diagram.
Fig. 5 system operates normally 1s three-phase current waveform diagram.
Fig. 6 system operates normally 1s three-phase voltage waveform diagram.
Fig. 7 A rectifies sequence current amplitude and phase angle schematic diagram.
Fig. 8 B rectifies sequence current amplitude and phase angle schematic diagram.
Fig. 9 A rectifies sequence voltage amplitude and phase angle schematic diagram.
Figure 10 B rectifies sequence voltage amplitude and phase angle schematic diagram.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawing and by specific embodiment, and following embodiment is to the present invention
Explanation, and the invention is not limited to following implementation.
As Figure 1-10 shows, provided in this embodiment
A kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab, comprising the following steps:
S1: the step of determining Fault Location Algorithm；
According to range measurement principle, the method for fault location can be divided into fault analytical method (line parameter circuit value positioning) and traveling wave method (temporarily
State traveling wave positioning).The electrical quantity source according to needed for ranging can be divided into single end distance measurement method and double-end distance measurement method again.Compared to list
Hold-carrying ranging, both-end method utilize the electrical quantity at route both ends to realize that fault localization, the algorithm pass through the electricity that measures both ends simultaneously
Current voltage is calculated according to long-line equation to opposite end, determines abort situation further according to fault point voltage phase etc. condition, because
This can completely eliminate the influence of transition resistance and system operation mode variation to range accuracy in principle.There is no systematicness
Error makes both-end method distance measurement result better than single-ended method, so attention of the both-end distance measuring algorithm by relay protection worker, Chang Beiyong
In the fault location of long UHV transmission line.The both-end distance measuring algorithm for being based on line parameter circuit value positioning below is analyzed.
Both end power supplying system as shown in Figure 1, the A in the operation of failure presteady state, the steady state voltage electric current difference that the both ends B measure
ForThe asynchronous angle of two end datas is that δ can be obtained by long-line equation:
The nonsynchronous phase angle difference δ of two end datas can be found out by formula (1-1) and formula (1-2), it is nonsynchronous to eliminate data
It influences.
Route complete transposition is assumed according to fig. 2, and when with symmetrical component method analysis circuit failure, positive-sequence component is in any class
All exist under the failure of type, therefore can be arranged with positive sequence network and write range equation to meet the needs of different faults positioning.The end A, B
The positive sequence fault current and voltage measured be respectivelyFault point positive sequence voltage isFailure
Generation can be obtained at away from the end A x by long-line equation:
Joint type (1-3) (1-4), arrangement can obtain:
Other amounts are the known quantity of line parameter circuit value or the amount that can survey out other than fault distance x in formula (1-5), this
Sample is achieved that the positioning of failure.
The presence of positive sequence network load current makes distance measurement result will receive the influence of load current, is existed according to fault message
The characteristics of being not present under normal operating condition, only occurring in device fails, the method by introducing positive sequence fault component
Reducing load current bring influences.
Fault component is concrete embodiment of the fault message in electrical quantity.For linear system principle of stacking by failure shape
State is decomposed into non-faulting state and failure additivity.Fig. 3 is the schematic diagram of failure additivity.
The corresponding amount measured when by failure subtracts non-faulting component just and can be obtained the component under failure additivity.In reality
It may be assumed that non-faulting component is equal to component before failure in.
Therefore in Fig. 3
Have in conjunction with long-line equation:
ΔUA1 cosh(γ1x)-Zc1ΔIA1 sinh(γ1X)=Δ UB1 cosh[γ1(l-x)]-Zc1ΔIB1 sinh
[γ1(l-x)]
Arrangement can obtain:
Fault distance can be found out by formula (1-6).
The step of building of S2:Simulink simulation model；
Simulink is the software package for realizing Modelling of Dynamic System and emulation that MATLAB is provided, and is based on block diagram
Emulation platform.Simulink is articulated in MATLAB environmentally, based on the powerful computing function of MATLAB, utilizes intuitive mould
Block block diagram is emulated and is calculated.
It include power system blockset PSB since Simulink4.1 editions.Electric system mould is used under Simulink environment
The module in block library carries out the emulation such as power electronic circuit, rlc circuit, electric system and electric machine control system in which can be convenient.
The module library PSB covers electrical component and power system simulation model common in electrical engineering subject.
(1) distribution parameter long transmission line model
(2) line parameter circuit value is arranged
ZA=1.05+j43.18 Ω, ZB=1.06+j44.92 Ω
L=300km, r1=0.0208 Ω/km, l1=0.8984mH/km, C1=0.0121 μ F/km
r0=0.1148 Ω/km, l0=2.2886mH/km, C0=0.0052 μ F/km
(3) simulation parameter is arranged
Emulate time started Start time=0.0s；Dwell time Stop time=0.2s；Select variable step size
Ode23t algorithm；Frequency Frequency=50Hz；By three-phase line malfunctioning module, Conversion fault time Transition is set
Time=[0.04,0.1]；A phase ground fault is set；Sampling time Sample time=0.00001s is set in oscillograph,
Simultaneously in oscillograph by sampled data format be set as Structure with time form and by result save to
In the Workspace of MATLAB.
(4) operating parameter is arranged；Phase angle ∠ δ=- 20 °, the transition resistance RF=50 Ω of both ends power supply is set, it is single-phase
Ground fault, fault point are arranged at x=270km, operation emulation.
(5) simulation waveform and data processing；It is found within the time that emulation has just brought into operation when handling simulation waveform, three
Phase voltage, the amplitude of current waveform be unstable and harmonic content, and last distance measurement result error is also larger, enables Double-End Source system
1s is operated normally, three-phase voltage current waveform diagram is obtained, such as Fig. 5,6.
In view of needing to use the voltage and current before failure in location algorithm, in conjunction with Fig. 5,6, discovery is operated normally when system
The three-phase voltage current amplitude harmonic content that tends towards stability is also smaller when to 0.8s or so.The amendment simulation run time is 1s, failure
Occur and the moment that disappears is changed to 0.8s and 0.88s respectively.It is emulated again.A, B are measured respectively rectifies sequence voltage current amplitude
With phase angle such as Fig. 7,8,9,10.
It is available to analyze simulation waveform
(6) MATLAB program calculation
Both-end distance measuring algorithm is programmed by MATLAB, and substitutes into measured valueJust
Distance measurement result can be obtained.
" LENGTHABC=fbcsjf (1316.2*exp (i*-0.288), 821.9*exp (i*-1.45), 394510.5*
Exp (i*-1.136), 375271.9*exp (i*-0.391))
LENGTHABC=2.7011e+02+2.5812e-01i
It acquires fault distance and takes real part x=270.11km.
S3: the step of distance measurement result is analyzed；
To guarantee that range unit can use in practical situations, enough accuracys should be made it have.Accuracy can be with
It is indicated with relative error, i.e. the absolute error percentage that accounts for total track length:
The limitation of economic and technical etc. keeps range error too small.In conjunction with actual conditions, ultra-high-tension power transmission line
Failure occurs mainly at shaft tower, so the requirement to fault location device precision reaches the distance between two shaft towers,
Site requirement can preferably be met generally between 300m~600m.
Emulation data in the case of the different transition resistances of table 1
Emulation data in the case of 2 different faults point of table
Table 1 is that δ=- 20 ° of fault point of both ends power supply phase angle difference is arranged at away from the end A x=230km, different types of failure
Distance measurement result in different transition resistances.
Different types of failure is in different faults when table 2 is δ=- 20 ° of transition resistance Rf=50 Ω of both ends power supply phase angle difference
Distance measurement result in the case of point.
As can be seen from Table 1 in addition in singlephase earth fault, there is error about 2% in the case of line end high resistance ground
Outside, the range accuracy in the case of other is all very high.Table 2 reflects the both-end distance measuring algorithm based on fault component to each position of route
The different types of failure for setting generation can be accurately positioned.
Described above is specific implementation process of the invention, the invention is not limited to single Fault Location Algorithm,
Being combined with actual parameter by will change simulation model can be to the electric system under the different method of operation and environmental condition
It is analyzed, help is played to the accuracy and adaptability of verifying various location algorithms.
Disclosed above is only the preferred embodiment of the present invention, but the present invention is not limited to this, any this field
What technical staff can think does not have creative variation, and without departing from the principles of the present invention made by several improvement and
Retouching, should all be within the scope of the present invention.
Claims (4)
1. a kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab, which comprises the following steps:
S1: the step of determining Fault Location Algorithm；
The step of building of S2:Simulink simulation model；
S3: the step of distance measurement result is analyzed.
2. a kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab according to claim 1, which is characterized in that
In the step S1, both end power supplying system when failure presteady state is run, distinguish by the steady state voltage electric current that the both ends A, B measure
ForThe asynchronous angle of two end datas is that δ can be obtained by long-line equation:
The nonsynchronous phase angle difference δ of two end datas is found out by formula (1-1) and formula (1-2), eliminates the nonsynchronous influence of data.
3. a kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab according to claim 1, which is characterized in that
In the step S1,
When with symmetrical component method analysis circuit failure, positive-sequence component all exists under any kind of failure, uses positive sequence network
Column write range equation to meet the needs of different faults positioning；A, the positive sequence fault current and voltage that the end B measures be respectivelyFault point positive sequence voltage isFailure generation can be obtained at away from the end A x by long-line equation:
Joint type (1-3) (1-4), can obtain:
Other amounts are the known quantity of line parameter circuit value or the amount that can survey out other than fault distance x in formula (1-5).
4. a kind of ultra-high-tension power transmission line Fault Locating Method based on Matlab according to claim 3, which is characterized in that
The step S2 specifically includes the following steps:
S21: the step of selecting distribution parameter long transmission line model；
S22: the step of line parameter circuit value is arranged；
S23: the step of simulation parameter is arranged；
S24: the step of operating parameter is arranged；
S25: the step of simulation waveform and data processing.
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2019
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| CN105425111A (en) * | 2015-12-16 | 2016-03-23 | 国网安徽省电力公司 | Transmission line fault ranging method using transition resistor features |
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Application publication date: 20191203 |