CN110221179A - A kind of System for HVDC System Earth Pole line-to-ground short trouble localization method - Google Patents
A kind of System for HVDC System Earth Pole line-to-ground short trouble localization method Download PDFInfo
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- CN110221179A CN110221179A CN201910583162.5A CN201910583162A CN110221179A CN 110221179 A CN110221179 A CN 110221179A CN 201910583162 A CN201910583162 A CN 201910583162A CN 110221179 A CN110221179 A CN 110221179A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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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 discloses a kind of System for HVDC System Earth Pole line-to-ground short trouble localization method, its step is mainly: A, data acquire: when judging that ground electrode circuit breaks down, obtaining the current signal of ground electrode circuit neutral bus voltage signal and two ground electrode circuits in real time；B, the characteristic harmonics component of earthing pole neutral bus voltage signal and two ground electrode circuit current signals data processing: is extracted by all-wave Fourier algorithm；C, the characteristic harmonics for calculating two lines road measure impedance；D, judge the fault branch of ground electrode circuit ground short circuit: calculating characteristic harmonics measurement impedance magnitude ratiok, and according tokDetermine fault branch；E, it determines the fault distance of ground electrode circuit ground short circuit: measuring the range function that impedance expression is derived according to characteristic harmonics and carry out fault location.The resistance to transition resistance ability of the present invention is strong, positioning accuracy is high, implementation cost is low, is easy to Project Realization.
Description
Technical field
The present invention relates to electric power system fault field of locating technology, specially a kind of System for HVDC System Earth Pole line
Road ground short circuit Fault Locating Method.
Background technique
Earthing pole is the important component of HVDC transmission system, plays and provides access for out-of-balance current, clamps down on
The effect of neutral point voltage.Ground electrode circuit distance is longer, across complex geographical environment, and the investigation work of line fault is extremely tired
Difficulty, therefore abort situation is quickly and accurately determined after ground electrode circuit breaks down, be conducive to ensure that the safety of bulk power grid is steady
Fixed operation.
The Fault Locating Method of ground electrode circuit can be divided into three classes at present, be impulses injection method, traveling wave method and failure respectively
Analytic approach.In the HVDC engineering to put into operation at present, ground electrode circuit generally installs the monitoring system based on impulses injection method, i.e.,
PEMO2000 device.The sinusoidal impulse signal of specific frequency is injected ground electrode circuit by this method, and measurement pulse signal is measuring
The time of catadioptric calculates fault distance in turn between end and fault point.However, engineering is in practice, due in high-frequency signal environment
The research of lower impedance monitoring mechanism is still insufficient, and ground electrode circuit impedance monitoring system exists to ground electrode circuit transient fault
The not high problem of range accuracy.Traveling wave method is the fault location side based on fault traveling wave propagation law on the line
Method calculates fault distance at the time of reaching line one-end or both-end by detection wavefront；This algorithm is to traveling wave wave
The reliability of head positioning and the accuracy requirement of velocity of wave are very high, but ground electrode circuit fault-signal is little, in catadioptric process
Middle decaying is obvious, this will bring biggish challenge to the reliability of Fault Location With Traveling Wave.Fault analytical method is based on fault impedance point
The Fault Locating Method of cloth rule, this method utilize electrical quantity, line equivalent circuit and the line of ground electrode circuit measuring end acquisition
Road parameter constructs specific location algorithm based on this, and then obtain abort situation to analyze fault signature, however existing algorithm
Larger by transition Resistance Influence, range accuracy is lower when high resistive fault, when not can guarantee ground electrode circuit distal end, high resistive fault still
Positioning accuracy, and due to algorithm need all fronts range inner iteration search for fault point, biggish calculation amount, which undoubtedly will lead to, to be asked
Solution preocess very complicated.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide one kind not by abort situation, transition resistance, signal noise etc.
The influence of factor, range accuracy with higher and stronger anti-noise jamming ability, and be easy to implement in practical projects
System for HVDC System Earth Pole line-to-ground short trouble localization method.Technical solution is as follows:
A kind of System for HVDC System Earth Pole line-to-ground short trouble localization method, comprising the following steps:
Step A: data acquisition
Whether the Control protection system detection ground electrode circuit of HVDC transmission system breaks down, if detecting event
Barrier, then obtain earthing pole neutral bus voltage signal U (t), first ground electrode circuit l1Current signal I1(t) and Article 2
Ground electrode circuit l2Current signal I2(t), wherein t indicates sampling instant；
Step B: data processing
Voltage signal U (t), the first ground electrode circuit l of earthing pole neutral bus are extracted using all-wave Fourier algorithm1
Current signal I1(t) and Article 2 ground electrode circuit l2Current signal I2(t) characteristic harmonics component, respectively obtains ground connection
The characteristic harmonics voltage value U of pole neutral busn, first ground electrode circuit l1Characteristic harmonic current value I1 nIt is grounded with Article 2
Polar curve road l2Characteristic harmonic current value I2 n；
Step C: characteristic harmonics are calculated and measure impedance
According to the characteristic harmonics voltage value U of earthing pole neutral busn, first ground electrode circuit l1Characteristic harmonic current
Value I1 nWith Article 2 ground electrode circuit l2Characteristic harmonic current value I2 n, calculate separately out first ground electrode circuit l1Feature
Harmonic impedance Z1 n=Un/I1 nWith Article 2 ground electrode circuit l2Characteristic harmonics impedance Z2 n=Un/I2 n；
Step D: judge the fault branch of ground electrode circuit ground short circuit
D1: the ratio k of the characteristic harmonics measurement impedance magnitude of two ground electrode circuits is calculated by following formula:
K=| Z1 n|/|Z2 n|
D2: by the fault branch judgment threshold k of the ratio k of characteristic harmonics measurement impedance magnitude and settingsetIt is compared；
If k < kset, then judge that ground short circuit failure occurs in first ground electrode circuit l1On；If k > 1/kset, then judge ground short circuit
Failure occurs in Article 2 ground electrode circuit l2On；
Step E: the fault distance of ground electrode circuit ground short circuit is determined
When judge ground short circuit failure occur in first ground electrode circuit l1When upper, fault point was calculate by the following formula from connecing
The distance x of earth polar neutral busf1:
When judge ground short circuit failure occur in Article 2 ground electrode circuit l2When upper, fault point was calculate by the following formula from connecing
The distance x of earth polar neutral busf2:
L is first ground electrode circuit l in above-mentioned two formula1With Article 2 ground electrode circuit l2Length, ZnTo be grounded polar curve
The unit character harmonic impedance on road, RgFor the pole location resistance of earthing pole.
Further, judgment threshold k in the step D2setIt is 0.95.
Further, the sample frequency in the step A is more than or equal to 1.2kHz.
The beneficial effects of the present invention are:
1) present invention precision with higher.The present invention measures impedanoe ratio using two ground electrode circuit characteristic harmonics
Feature determines fault branch, and the range function based on the measurement impedance of specific characteristic harmonics carries out fault location, and ranging letter
Number eliminates the influence of transition resistance from principle, and the localization method is maximum relatively fixed within the scope of ground electrode circuit all fronts
Position error very little, precision with higher；
2) present invention is highly reliable.The present invention can reliably judge fault branch simultaneously within the scope of ground electrode circuit all fronts
Accurate positioning failure overcomes existing method when high resistance earthing fault occurs since two lines road electric current difference is small caused
Erroneous judgement problem, and positioning result is not influenced by factors such as abort situation, transition resistance, signal noises, is had stronger reliable
Property；
3) operation of the present invention is simple, uses convenient for Practical Project.Present invention only requires from ground electrode circuit measuring end recording
The characteristic harmonics component of each electric signal is extracted in data, and phase then is carried out to two ground electrode circuit characteristic harmonics measurement impedances
Fault branch differentiation and the fault location process of can realizing should be calculated, it is easy to operate；Range equation operation result is unique simultaneously
Value, without cumbersome search and iterative process, algorithm is simple；And the method for the present invention is merely with existing single-ended measurable in system
Electrical measuring device and protective device are convenient for engineer application without increasing hardware device.
Detailed description of the invention
Fig. 1 is Article 2 ground electrode circuit l in emulation experiment of the present invention2The schematic diagram of ground fault occurs.
Specific embodiment
The present invention is described in further details combined with specific embodiments below.
A kind of localization method of System for HVDC System Earth Pole line-to-ground short trouble, the steps include:
A, data acquire
Whether the Control protection system detection ground electrode circuit of HVDC transmission system breaks down, if detecting event
Barrier, then obtain earthing pole neutral bus voltage signal U (t), first ground electrode circuit l1Current signal I1(t) and Article 2
Ground electrode circuit l2Current signal I2(t), wherein t indicates sampling instant；
B, data processing
Ground electrode circuit fault locator carries out the following processing the data that electrical measuring device is sent:
Voltage signal U (t), current signal I are extracted using all-wave Fourier algorithm1(t) and current signal I2(t) feature
Harmonic component respectively obtains the characteristic harmonics voltage value U of earthing pole neutral busn, first ground electrode circuit l1Characteristic harmonics
Current value I1 nWith Article 2 ground electrode circuit l2Characteristic harmonic current value I2 n, wherein characteristic harmonics frequency is 600Hz；
C, the calculating of characteristic harmonics measurement impedance
Ground electrode circuit fault locator is according to the characteristic harmonics voltage value U of earthing pole neutral busn, first ground connection
Polar curve road l1Characteristic harmonic current value I1 nWith Article 2 ground electrode circuit l2Characteristic harmonic current value I2 n, calculate separately out
One ground electrode circuit l1Characteristic harmonics impedance Z1 n=Un/I1 nWith Article 2 ground electrode circuit l2Characteristic harmonics impedance Z2 n=
Un/I2 n；
D, the judgement of ground electrode circuit ground short circuit fault branch
D1, ground electrode circuit fault locator measure impedance by the characteristic harmonics that following formula calculates two ground electrode circuits
The ratio k of amplitude:
K=| Z1 n|/|Z2 n|
Characteristic harmonics are measured the ratio k of impedance magnitude and the fault branch judgment threshold of setting by D2, fault locator
ksetIt is compared；If k < kset, then judge that ground short circuit failure occurs in first ground electrode circuit l1On；If k > 1/kset, then
Judge that ground short circuit failure occurs in Article 2 ground electrode circuit l2On.Judgment threshold k in the present embodimentsetTake 0.95, then 1/
ksetIt is 1.053.
E, the determination of ground electrode circuit ground short circuit fault distance
When ground electrode circuit fault locator judges that ground short circuit failure occurs in first ground electrode circuit l1When upper；
Ground electrode circuit fault locator is calculate by the following formula fault point from earthing pole neutral bus distance xf1:
When ground electrode circuit fault locator judges that ground short circuit failure occurs in Article 2 ground electrode circuit l2When upper；
Ground electrode circuit fault locator is calculate by the following formula fault point from earthing pole neutral bus distance xf2:
L is first ground electrode circuit l in above-mentioned two formula1With Article 2 ground electrode circuit l2Length, ZnTo be grounded polar curve
Unit character harmonic impedance, the R on roadgFor the pole location resistance of earthing pole.
The principle of Fault Locating Method of the present invention is as follows:
Ground electrode circuit is made of the parallel overhead transmission line of double back, and characteristic harmonics measurement impedance is totally in perception, feature
Mainly determined by line equivalent circuit and impedance parameter.When ground electrode circuit operates normally, two ground electrode circuits in parallel
The characteristic harmonic current flowed through is equivalent in the same direction, characteristic harmonics measurement impedance is identical；When a ground electrode circuit therein connects
When earth fault, equivalent circuit changes, and the characteristic harmonic current of this route increased dramatically, characteristic harmonics measure impedance sharply
Reduce, and the measurement impedance of the characteristic harmonics of the ground electrode circuit of another non-failure is held essentially constant.So, it is connect using two
The ratio of the characteristic harmonics measurement impedance of earth polar route just can determine that fault branch.
As first ground electrode circuit l1Characteristic harmonics impedance magnitude and Article 2 ground electrode circuit l2Characteristic harmonics resistance
The ratio of anti-amplitude is less than ksetWhen, then judge first ground electrode circuit l1Ground fault occurs；When first ground connection polar curve
Road l1Characteristic harmonics impedance magnitude and Article 2 ground electrode circuit l2Characteristic harmonics impedance magnitude ratio be greater than 1/kset
When, then judge Article 2 ground electrode circuit l2Ground fault occurs.
After determining fault branch, if ground short circuit failure occurs in Article 2 ground electrode circuit l2When upper, if fault point from
The distance of earthing pole neutral bus is xf2, circuit equivalent is desired to make money or profit with △-Y connection equivalent transformation, after simplifying first at this time
Ground electrode circuit l1Characteristic harmonics impedance Z1 nWith Article 2 ground electrode circuit l2Characteristic harmonics impedance Z2 nAre as follows:
Above formula simultaneous is eliminated into transition resistance RdArticle 2 ground electrode circuit l is obtained afterwards2Characteristic harmonics impedance Z2 nAre as follows:
As available from the above equation, Article 2 ground electrode circuit l2Fault point is from earthing pole neutral bus distance xf2:
Similarly, as first ground electrode circuit l1When ground fault occurs, first ground electrode circuit l can be obtained1Fault point from
The distance x of earthing pole neutral busf1:
Above-mentioned xf1With xf2Expression formula in, l be first ground electrode circuit l1l1With Article 2 ground electrode circuit l2Length
Degree, ZnFor unit character harmonic impedance, the R of ground electrode circuitgFor the pole location resistance of earthing pole.
Thus, it can be known that after judging earthing pole line-to-ground short trouble branch, it can be according to xf1With xf2Table
Up to formula further determine that fault point to neutral bus distance.And in xf1With xf2Expression formula in do not contain transition resistance Rd, i.e.,
The Fault Locating Method of ground electrode circuit proposed by the present invention is not influenced by transition resistance.Range function accurately determines accordingly
The abort situation of fault branch, so that the present invention is able to carry out accurately fault location.
Emulation experiment:
For verify mentioned method validity and reliability, according to Practical Project parameter based on PSCAD/EMTDC software
Build ± 800kV/5kA bipolar HVDC system the simulation model containing ground electrode system.DC transmission system in model
Specified transmission capacity is 8000MW, transmission line length 1652km.In its ground electrode system, pole location resistance is 0.2 Ω, route
Length is 101.4km, and route uses Bergeron model.
In the simulation model of this paper, Article 2 ground electrode circuit l is set2Single-line ground failure, failure occur in 1s
Distance xf2=30km, transition resistance RdRespectively 0 Ω, 100 Ω and 200 Ω, setting voltage, electric current sample frequency be 10kHz,
Take threshold value kset=0.95,1/kset=1.053.
Voltage signal U (t), current signal I are extracted using all-wave Fourier algorithm1(t) and current signal I2(t) feature
Harmonic component respectively obtains the characteristic harmonics voltage value U of earthing pole neutral busn, first ground electrode circuit l1Characteristic harmonics
Current value I1 nWith Article 2 ground electrode circuit l2Characteristic harmonic current value I2 n, two line characteristics harmonic measure impedance values are calculated,
Fault branch is determined using the ratio of the two and fault distance, specific simulation result such as following table are solved by range equation
It is shown.Wherein relative positioning error defines:
Fault location result
As seen from table, in present invention emulation case, first ground electrode circuit l1Characteristic harmonics measure impedance Z1 nTherefore
Slightly change after barrier.Article 2 ground electrode circuit l2Characteristic harmonics measure impedance Z2 nAmplitude be substantially reduced, transition resistance is got over
Small, amplitude variable quantity is bigger；Z2 nPhase angle be substantially reduced, with impedance magnitude on the contrary, transition resistance is bigger, phase angle change amount is got over
Greatly.Although line characteristics harmonic measure impedance will receive the influence of transition resistance, the localization method that the present invention is mentioned is being counted
Transition resistance can be eliminated from principle when calculating fault distance.It can be seen that the present invention from the positioning result of emulation case to be adopted
Locating scheme can correctly determine fault branch, and positioning result error is smaller, precision with higher.
Claims (3)
1. a kind of System for HVDC System Earth Pole line-to-ground short trouble localization method, which is characterized in that including following
Step:
Step A: data acquisition
Whether the Control protection system detection ground electrode circuit of HVDC transmission system breaks down, if detecting failure,
Obtain earthing pole neutral bus voltage signal U (t), first ground electrode circuit l1Current signal I1(t) and Article 2 earthing pole
Route l2Current signal I2(t), wherein t indicates sampling instant；
Step B: data processing
Voltage signal U (t), the first ground electrode circuit l of earthing pole neutral bus are extracted using all-wave Fourier algorithm1Electricity
Flow signal I1(t) and Article 2 ground electrode circuit l2Current signal I2(t) characteristic harmonics component, respectively obtains in earthing pole
The characteristic harmonics voltage value U of sexupara linen, first ground electrode circuit l1Characteristic harmonic current value I1 nPolar curve is grounded with Article 2
Road l2Characteristic harmonic current value I2 n；
Step C: characteristic harmonics are calculated and measure impedance
According to the characteristic harmonics voltage value U of earthing pole neutral busn, first ground electrode circuit l1Characteristic harmonic current value I1 n
With Article 2 ground electrode circuit l2Characteristic harmonic current value I2 n, calculate separately out first ground electrode circuit l1Characteristic harmonics
Impedance Z1 n=Un/I1 nWith Article 2 ground electrode circuit l2Characteristic harmonics impedance Z2 n=Un/I2 n；
Step D: judge the fault branch of ground electrode circuit ground short circuit
D1: the ratio k of the characteristic harmonics measurement impedance magnitude of two ground electrode circuits is calculated by following formula:
K=| Z1 n|/|Z2 n|
D2: by the fault branch judgment threshold k of the ratio k of characteristic harmonics measurement impedance magnitude and settingsetIt is compared；If k <
kset, then judge that ground short circuit failure occurs in first ground electrode circuit l1On；If k > 1/kset, then judge ground short circuit failure
Occur in Article 2 ground electrode circuit l2On；
Step E: the fault distance of ground electrode circuit ground short circuit is determined
When judge ground short circuit failure occur in first ground electrode circuit l1When upper, fault point was calculate by the following formula from earthing pole
The distance x of neutral busf1:
When judge ground short circuit failure occur in Article 2 ground electrode circuit l2When upper, fault point was calculate by the following formula from earthing pole
The distance x of neutral busf2:
L is first ground electrode circuit l in above-mentioned two formula1With Article 2 ground electrode circuit l2Length, ZnFor ground electrode circuit
Unit character harmonic impedance, RgFor the pole location resistance of earthing pole.
2. System for HVDC System Earth Pole line-to-ground short trouble localization method according to claim 1, special
Sign is, judgment threshold k in the step D2setIt is 0.95.
3. System for HVDC System Earth Pole line-to-ground short trouble localization method according to claim 1, special
Sign is that the sample frequency in the step A is more than or equal to 1.2kHz.
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| CN115343658A (en) * | 2022-10-19 | 2022-11-15 | 广东电网有限责任公司佛山供电局 | Grounding state identification method and device based on resistance type strain sensor |
| CN115343658B (en) * | 2022-10-19 | 2023-01-24 | 广东电网有限责任公司佛山供电局 | Grounding state identification method and device based on resistance type strain sensor |
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| CN110221179B (en) | 2020-06-09 |
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