CN108344924A - A kind of DC power transmission line traveling wave fault location device startup method and system - Google Patents
A kind of DC power transmission line traveling wave fault location device startup method and system Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
The present invention relates to a kind of DC power transmission line traveling wave fault location devices to start method and system, the method includes：The DC power transmission line voltage condition after failure is obtained according to DC power transmission line voltage variety；Window when determining the accident analysis of the DC power transmission line according to the DC power transmission line voltage condition after failure；Judge whether failure starts traveling wave fault location device to the DC power transmission line when the direct current transmission line fault according to the voltage variety of the DC power transmission line in window when the accident analysis of the DC power transmission line.Technical solution provided by the invention, time-domain integration transformation is carried out to current conversion station PLC neutral point current signals and obtains DC power transmission line voltage variety, and then extract its fault component, and line fault is judged whether there is by fault component identification, so as to by starting DC power transmission line traveling wave fault location device recording.
Description
Technical field
The present invention relates to power system automatic fields, and in particular to a kind of DC power transmission line traveling wave fault location device
Start method and system.
Background technology
In recent years, DC transmission system obtains fast-developing in China, and direct current transmission line fault ranging is for circuit event
It quickly excludes, restore electricity and the safety and stability of ac and dc systems is of great significance after barrier.Measuring distance of transmission line fault
Impedance method, fault analytical method, traveling wave method etc. can be divided into from principle, wherein impedance method etc. is because by line parameter circuit value, transition resistance etc.
It is affected in DC line using less, DC transmission line road focus on the application traveling wave method.The event of DC power transmission line traveling wave
Barrier range unit (hereinafter referred to as DC line range unit) preferably meets the requirement of power operation unit in precision,
But it also exposes start the relatively low disadvantage of reliability in operation.Currently, practical DC line range unit is
It is first starter recording using both-end method, in workflow, both sides mutually pass data and are finally completed fault location, therefore, device
Reliable start be key factor that can system work normally.
From alternating current circuit fault location device directly by PT/CT acquire circuit voltage/current it is different, due to traveling wave method pair
Data sampling rate is more demanding (500kHz or more), it is difficult to directly utilize the electric mutual inductor data of current conversion station；Existing AC line
Road range unit is all to realize fault location using noise filter (PLC) neutral point current in current conversion station.
It is line voltage distribution change rate (transient) since the PLC neutral point currents of DC line range unit acquisition are corresponding
Rather than actual track voltage, existing DC line range unit is all made of transient starting algorithm, and exposes in actual operation
Go out problems with：
(1) fixed value adjusting is difficult, and anti-interference ability is weak.DC line range unit is due to sample mode and current conversion station internal control
Insurance system differs greatly, it is difficult to directly refer to its definite value and be arranged.The characteristics of allowing appropriate malfunction in view of range unit, lacking
In the case of reference value, most device definite value settings are relatively low.But it finds in actual operation, DC transmission system is led due to converter valve
Clearance broken belt carrys out a fairly large number of Transient Disturbance Signal, and the transient definite value of DC line range unit, which sets too low device, to be gone out
The normal work of device can be influenced especially in load side by now continuously starting phenomenon when serious.
(2) it is influenced by line length and position of failure point.Since transient state travelling wave is in transmission process, high frequency content decaying compared with
Soon, and with line length it has exponent relation；When circuit side is biased in fault point, the side transient of distance fault point farther out is past
Past smaller, transient starting algorithm is just affected.At home in man-made short-circuit's experiment, fault point is located at circuit both sides, both sides
Neutral point current amplitude just differs larger, and the bigger feature of the longer difference in magnitude of circuit is presented.
(3) it is affected by fault resistance, DC line ground connection/transcient short circuit time transition electricity similar with AC system
When hindering larger, transient amplitude is relatively low, can also influence normally to start.
Invention content
The present invention provides a kind of DC power transmission line traveling wave fault location device startup method and system, and the purpose is to exchange
It flows station PLC neutral point current signals and carries out time-domain integration transformation acquisition DC power transmission line voltage variety, and then extract its event
Hinder component, and line fault is judged whether there is by fault component identification, so as to by starting DC power transmission line traveling wave
Fault location device recording.
The purpose of the present invention is what is realized using following technical proposals：
A kind of DC power transmission line traveling wave fault location device startup method, it is improved in that including：
The DC power transmission line voltage condition after failure is obtained according to DC power transmission line voltage variety；
Window when determining the accident analysis of the DC power transmission line according to the DC power transmission line voltage condition after failure；
Judge institute according to the voltage variety of the DC power transmission line in window when the accident analysis of the DC power transmission line
Stating DC power transmission line, whether failure starts traveling wave fault location device when the direct current transmission line fault.
Preferably, the DC power transmission line voltage feelings obtained according to DC power transmission line voltage variety after failure
Condition, including：
Obtain the low frequency component of the DC power transmission line voltage variety and the DC power transmission line voltage variety
And high fdrequency component；
Failure initial time t is determined according to the modulus maximum of the high fdrequency component0And high-frequency resonant end time te；
Work as tmin≤te-t0≤tdWhen, there are high-frequency resonants for the DC power transmission line voltage after the failure, work as te-t0≥td
When, high-frequency resonant is not present in the DC power transmission line voltage after the failure；
Wherein, tminThe lower limiting value of the high-frequency resonant of DC power transmission line voltage, tdFor preset time setting value.
Further, the acquisition DC power transmission line voltage variety and the DC power transmission line voltage change
The low frequency component and high fdrequency component of amount, including：
Time-domain integration is carried out to PLC neutral point current sampled signals, obtains DC power transmission line voltage variety；
Single scale wavelet transformation is carried out to the DC power transmission line voltage variety using spline function small echo, by its point
Solution is low frequency component a (i) and high fdrequency component d (i), i=0,1 ... ..., and n, n are the sampling instant sum of recorded wave file.
Further, the modulus maximum according to the high fdrequency component determines failure initial time t0And high-frequency resonant knot
Beam time te, including：
As the failure initial time at the time of maximum value in the modulus maximum sequence of the high fdrequency component is corresponded to
t0；
By failure initial time t in the modulus maximum sequence of the high fdrequency component0Modulus maximum corresponding to moment later
The closest initial time t more than zero and less than threshold value ζ0At the time of as the high-frequency resonant end time te。
Further, the DC power transmission line voltage condition according to after failure determines the event of the DC power transmission line
Hinder analysis window, including：
If there are high-frequency resonant, the failures point of the DC power transmission line for the DC power transmission line voltage after the failure
Window T when analysisc=te-t0；
If high-frequency resonant, the failure of the DC power transmission line is not present in the DC power transmission line voltage after the failure
Analysis window Tc=ke-t0；Wherein, keFor after the direct current transmission line fault after failure initial time voltage variety it is steady
The inflection point moment of state component.
Further, the steady of voltage variety after the direct current transmission line fault after failure initial time is determined as the following formula
The inflection point moment k of state componente：
Wherein, ke∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ke) it is ktheMoment
The second dervative of low frequency component, a " (ke+ δ) it is ktheThe second dervative of the low frequency component at+δ moment, a " (ke- δ) it is ktheWhen-δ
Carve the second dervative of low frequency component.
Preferably, the voltage of the DC power transmission line when accident analysis according to the DC power transmission line in window becomes
Change amount judges whether failure starts traveling wave fault location dress to the DC power transmission line when the direct current transmission line fault
It sets, including：
Window T when high-frequency resonant and the accident analysis is not present in DC power transmission line voltage after failurecInterior accumulative electricity
Variable quantity is pressed to be more than or equal to threshold value ξ1When, then the faulty generation of DC power transmission line；Or
There are window T when high-frequency resonant and the accident analysis for DC power transmission line voltage after failurecInterior voltage becomes
The fault component gross energy of change amount is more than or equal to threshold value ξ2When, then the faulty generation of DC power transmission line.
Further, window T when determining the accident analysis as the following formulacInterior accumulation voltage variation delta uf：
uf(i) it is the fault component of DC power transmission line, i=0,1 ... ..., n, n are that the sampling instant of recorded wave file is total
Number.
Further, window T when determining the accident analysis as the following formulacThe fault component gross energy Δ of interior voltage variety
E：
Wherein, the fault component u of the DC power transmission line is determined as the following formulaf(i)：
Wherein, a (t0) it is t0The low frequency component at moment, a (t0- 1) it is t0The low frequency component at -1 moment, ksWhen initial for failure
The steady-state component inflection point moment of voltage variety, a (k before direct current transmission line fault before quarters) it is ksThe low frequency at moment point
Amount, TfFor failure presteady state signal duration, Tf=t0-ks。
Further, voltage variety is steady before the direct current transmission line fault before determining failure initial time as the following formula
State component inflection point moment ks：
Wherein, ks∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ks) it is kthsMoment
The second dervative of low frequency component, a " (ks+ δ) it is kthsThe second dervative of+δ moment low frequency components, a " (ks- δ) it is kths- δ the moment
The second dervative of low frequency component.
A kind of DC power transmission line traveling wave fault location device activation system, it is improved in that the system comprises：
Acquiring unit, for according to the DC power transmission line voltage feelings after DC power transmission line voltage variety acquisition failure
Condition；
Determination unit, the event for determining the DC power transmission line according to the DC power transmission line voltage condition after failure
Hinder analysis window；
Judging unit is used for the voltage of the DC power transmission line when accident analysis according to the DC power transmission line in window
Variable quantity judges whether failure starts traveling wave fault location to the DC power transmission line when the direct current transmission line fault
Device.
Beneficial effects of the present invention：
Technical solution provided by the invention obtains the DC transmission line after failure according to DC power transmission line voltage variety
After the voltage condition of road, the accident analysis of the DC power transmission line is determined further according to the DC power transmission line voltage condition after failure
When window；So as to further determine that fault component and fault component identification decision line fault, DC line ranging is effectively improved
Device starts reliability, reduces the influence that transition resistance, position of failure point, line length start device；Meanwhile by carrying
It takes the line voltage distribution fault component of longer cycle to avoid interference of the transient disturbance in straight-flow system to starting algorithm, has relatively strong
Anti-interference ability, total operand is small, realizes easy, and algorithm of the present invention is in addition to single scale wavelet transformation, without multiple dimensioned filter
The macrooperations amount such as wave, fitting calculates, and is suitable for the quick startup of device.
Description of the drawings
Fig. 1 is the flow chart that a kind of DC power transmission line traveling wave fault location device of the present invention starts method；
Fig. 2 (a) is PLC neutral point currents original recording oscillogram in Hami southern side in the embodiment of the present invention；
Fig. 2 (b) is PLC neutral point currents original recording oscillogram in Zhengzhou side in the embodiment of the present invention；
Fig. 3 (a) is the oscillogram of the original signal in Hami southern side obtained after being sampled in the embodiment of the present invention；
Fig. 3 (b) is the oscillogram of the original signal of the Zhengzhou side obtained after being sampled in the embodiment of the present invention；
Fig. 3 (c) is the oscillogram of the signal in Hami southern side for carrying out restoring after time-domain integration in the embodiment of the present invention；
Fig. 3 (d) is the oscillogram of the signal for the Zhengzhou side for carrying out restoring after time-domain integration in the embodiment of the present invention；
Fig. 4 (a) is the oscillogram of the modulus maximum in Hami southern side in the embodiment of the present invention；
Fig. 4 (b) is the oscillogram of the modulus maximum of Zhengzhou side in the embodiment of the present invention；
Fig. 5 (a) is the oscillogram of the steady-state component inflection point in Hami southern side in the embodiment of the present invention；
Fig. 5 (b) is the oscillogram of the steady-state component inflection point of Zhengzhou side in the embodiment of the present invention；
Fig. 6 (a) is the original signal figure of Jiangling in the embodiment of the present invention-Guangzhou DC power transmission line；
Fig. 6 (b) is that Jiangling in the embodiment of the present invention-Guangzhou DC power transmission line carries out the signal restored after time-domain integration
Figure；
Fig. 6 (c) is the oscillogram of the modulus maximum of Jiangling in the embodiment of the present invention-Guangzhou DC power transmission line；
Fig. 6 (d) is the oscillogram of the steady-state component inflection point of Jiangling in the embodiment of the present invention-Guangzhou DC power transmission line；
Fig. 7 (a) is the original signal figure of silk screen in the embodiment of the present invention-southern Jiangsu UHVDC Transmission Lines；
Fig. 7 (b) is that silk screen in the embodiment of the present invention-southern Jiangsu UHVDC Transmission Lines carry out the signal restored after time-domain integration
Figure；
Fig. 7 (c) is the oscillogram of the modulus maximum of silk screen in the embodiment of the present invention-southern Jiangsu UHVDC Transmission Lines；
Fig. 7 (d) is the waveform of the steady-state component inflection point of silk screen in the embodiment of the present invention-southern Jiangsu UHVDC Transmission Lines
Figure；
Fig. 8 is a kind of structural schematic diagram of DC power transmission line traveling wave fault location device activation system of the present invention.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to the specific implementation mode of the present invention.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The all other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Breakdown judge is carried out by " line voltage distribution change rate " this transient for the prior art, it is defeated to be easy to cause direct current
The continuous error starting of electric line traveling wave fault location device or the problem of do not start, therefore, the present invention proposes a kind of direct current transportation
Circuit traveling wave fault location device starts method and system, is carried by the time-domain integration to current conversion station PLC neutral point current signals
Line taking road steady state fault component, and by determining whether faulty generation to the judgement of fault component, improve device and reliably open
Dynamic probability, as shown in Figure 1, including：
101. obtaining the DC power transmission line voltage condition after failure according to DC power transmission line voltage variety；
102. determine the accident analysis of the DC power transmission line according to the DC power transmission line voltage condition after failure
Window；
103. being sentenced according to the voltage variety of the DC power transmission line in window when the accident analysis of the DC power transmission line
Whether failure starts traveling wave fault location device to the DC power transmission line that breaks when the direct current transmission line fault.
Further, the step 101, including：
Obtain the low frequency component of the DC power transmission line voltage variety and the DC power transmission line voltage variety
And high fdrequency component；
Failure initial time t is determined according to the modulus maximum of the high fdrequency component0And high-frequency resonant end time te；
Work as tmin≤te-t0≤tdWhen, there are high-frequency resonants for the DC power transmission line voltage after the failure, work as te-t0≥td
When, high-frequency resonant is not present in the DC power transmission line voltage after the failure；
Wherein, tminThe lower limiting value of the high-frequency resonant of DC power transmission line voltage, tdFor preset time setting value.
Specifically, the acquisition DC power transmission line voltage variety and the DC power transmission line voltage variety
Low frequency component and high fdrequency component, including：
Time-domain integration is carried out to PLC neutral point current sampled signals, obtains DC power transmission line voltage variety；
Single scale wavelet transformation is carried out to the DC power transmission line voltage variety using spline function small echo, by its point
Solution is low frequency component a (i) and high fdrequency component d (i), i=0,1 ... ..., and n, n are the sampling instant sum of recorded wave file.
Specifically, the modulus maximum according to the high fdrequency component determines failure initial time t0And high-frequency resonant terminates
Time te, including：
As the failure initial time at the time of maximum value in the modulus maximum sequence of the high fdrequency component is corresponded to
t0；
By failure initial time t in the modulus maximum sequence of the high fdrequency component0Modulus maximum corresponding to moment later
The closest initial time t more than zero and less than threshold value ζ0At the time of as the high-frequency resonant end time te。
Specifically, the DC power transmission line voltage condition according to after failure determines the failure of the DC power transmission line
Analysis window, including：
If there are high-frequency resonant, the failures point of the DC power transmission line for the DC power transmission line voltage after the failure
Window T when analysisc=te-t0；
If high-frequency resonant, the failure of the DC power transmission line is not present in the DC power transmission line voltage after the failure
Analysis window Tc=ke-t0；Wherein, keFor after the direct current transmission line fault after failure initial time voltage variety it is steady
The inflection point moment of state component.
Specifically, after direct current transmission line fault after determining failure initial time as the following formula voltage variety stable state
The inflection point moment k of componente：
Wherein, ke∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ke) it is ktheMoment
The second dervative of low frequency component, a " (ke+ δ) it is ktheThe second dervative of the low frequency component at+δ moment, a " (ke- δ) it is ktheWhen-δ
Carve the second dervative of low frequency component.
Further, when obtaining the accident analysis of DC power transmission line after window, the step 103, including：
Window T when high-frequency resonant and the accident analysis is not present in DC power transmission line voltage after failurecInterior accumulative electricity
Variable quantity is pressed to be more than or equal to threshold value ξ1When, then the faulty generation of DC power transmission line；Or
There are window T when high-frequency resonant and the accident analysis for DC power transmission line voltage after failurecInterior voltage becomes
The fault component gross energy of change amount is more than or equal to threshold value ξ2When, then the faulty generation of DC power transmission line.
Specifically, window T when determining the accident analysis as the following formulacInterior accumulation voltage variation delta uf：
uf(i) it is the fault component of DC power transmission line, i=0,1 ... ..., n, n are that the sampling instant of recorded wave file is total
Number.
Specifically, window T when determining the accident analysis as the following formulacThe fault component gross energy Δ E of interior voltage variety：
Wherein, the fault component u of the DC power transmission line is determined as the following formulaf(i)：
Wherein, a (t0) it is t0The low frequency component at moment, a (t0- 1) it is t0The low frequency component at -1 moment, ksWhen initial for failure
The steady-state component inflection point moment of voltage variety, a (k before direct current transmission line fault before quarters) it is ksThe low frequency at moment point
Amount, TfFor failure presteady state signal duration, Tf=t0-ks。
Specifically, before direct current transmission line fault before determining failure initial time as the following formula voltage variety stable state
Component inflection point moment ks：
Wherein, ks∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ks) it is kthsMoment
The second dervative of low frequency component, a " (ks+ δ) it is kthsThe second dervative of+δ moment low frequency components, a " (ks- δ) it is kths- δ the moment
The second dervative of low frequency component.
For example, by taking Ha Minan-Zhengzhou UHVDC Transmission Lines man-made short-circuit experiment as an example, the super 2300km of the total track length,
Be the country apart from one of longest DC power transmission line.Man-made short-circuit testing site is close to Zhengzhou current conversion station, apart from current conversion station about 1km
Left and right, man-made short-circuit's experiment are grounded close to simple metal, and as shown in Fig. 2 (a) and Fig. 2 (b), circuit both sides current amplitude is respectively
2.2A and 52A is differed close to 22 times.
Waveform shown in Fig. 2 (a) and Fig. 2 (b) is practical high-speed sample data, is used in actual device starts and calculates
It is relative low speeds log-on data, sample rate 125kHz.Abscissa is sampled point in figure, and sampled point interval 8us, ordinate is code
Value is sampled value, and the practical PLC neutral point currents 50A code values in corresponding diagram 2 (a) and Fig. 2 (b) are 2047.By step described herein
It is rapid as follows：
PLC neutral point current sampled signals are restored using time-domain integration reduction, such as Fig. 3 (a) of the waveform after reduction,
Shown in Fig. 3 (b), 3 (c) and Fig. 3 (d), based on code value, Hami south is 68, and Zhengzhou station is 1607.
As shown in Fig. 4 (a) and Fig. 4 (b), the DC power transmission line voltage variety is carried out using spline function small echo
Single scale wavelet transformation, is broken down into low frequency component a (i) and high fdrequency component d (i), i=0,1 ... ..., n, and n is recorded wave file
Sampling instant sum；Extract wavelet transformation detail coefficients modulus maximum sequence, the failure initial time and height of identification signal
Frequency resonance time.
As shown in Fig. 5 (a) and Fig. 5 (b), it is based on low frequency component, calculates the second dervative of low frequency component, identifies steady-state signal
Steady-state signal inflection point before failure and after failure.
Window when fault component is carried out to analyze：By Fig. 4 (a), Fig. 4 (b), Fig. 5 (a) and Fig. 5 (b) can obtain M station failures it is initial when
Carve failure initial time t0=3066, resonance end time te=3140, steady-state signal inflection point k after failuree=3148, work as the time
When setting valve is 2 milliseconds, then window T when accident analysisc=(te-t0)=74 × 8=592us；N station failure initial times t0=
3053, without apparent resonant process, steady-state signal inflection point k after failuree=3063, then window T when accident analysisc=(ke-t0)10×8
==80us；
Trend term is eliminated：M station failure initial time failure initial times t0=3066, failure presteady state signal knee ks=
2940, then failure presteady state signal duration Tf=(te-t0)=126 × 8=1008us, trend term total variation are 16, absolutely
It is 0.127 (based on sampled point) to value mean value；N station failure initial times t0=3053, failure presteady state signal knee ks=
2529, then failure presteady state signal duration Tf=(te-ts)=524 × 8=4192us, trend term total variation are 345；
Fault component transfinites judgement：The stations M data window T in accident analysiscIn (592us), trend term total change based on code value
Change amount is 7.63, and accumulation voltage variable quantity is 336.93, and after eliminating trend term interference, absolute value mean value is 4.549 (by sampling
Point meter)；The stations N data window T in accident analysiscIn (80us), trend term total variation 65.84 based on code value, in the trend of elimination
After item interference, accumulation voltage variable quantity is 2562.94.Either Hami southern station or Zhengzhou station, when line voltage distribution Relative fault
There is significant change before quarter, judge faulty generation, starts traveling wave fault location device.
Start for example, only having side device by taking Jiangling-Guangzhou DC power transmission line physical fault as an example, in the secondary failure,
Judge that the secondary failure is higher for high resistive fault probability, PLC neutral point current maximum values are 14, belong to the lower DC line of amplitude
Failure.Using methods described herein, voltage change waveform shown in Fig. 6 (b) can be obtained after the integrated transformation of original signal, passes through small echo
Transformation can extract failure initial time and high-frequency resonant cut-off time, and event can be effectively identified into crossing after elimination trend term influences
Voltage after barrier persistently falls, coincidence circuit fault characteristic.Analyze intermediate result such as Fig. 6 (a), 6 (b), shown in 6 (c) and 6 (d).
For example, by taking silk screen-southern Jiangsu UHVDC Transmission Lines load side typical case's transient disturbance waveform as an example, PLC neutral point electricity
It is 30 to flow maximum value, and amplitude is relatively high, but increases or fall without continuous voltage after failure initial time, belongs to typical transient state
Disturbance.Analyze intermediate result such as Fig. 7 (a), 7 (b), shown in 7 (c) and 7 (d).
The present invention also provides a kind of DC power transmission line traveling wave fault location device activation systems, as shown in figure 8, the system
System includes：
Acquiring unit, for according to the DC power transmission line voltage feelings after DC power transmission line voltage variety acquisition failure
Condition；
Determination unit, the event for determining the DC power transmission line according to the DC power transmission line voltage condition after failure
Hinder analysis window；
Judging unit is used for the voltage of the DC power transmission line when accident analysis according to the DC power transmission line in window
Variable quantity judges whether failure starts traveling wave fault location to the DC power transmission line when the direct current transmission line fault
Device.
Further, the acquiring unit, including：
First acquisition module, for obtaining the DC power transmission line voltage variety and the DC power transmission line voltage
The low frequency component and high fdrequency component of variable quantity；
First determining module, for determining failure initial time t according to the modulus maximum of the high fdrequency component0And harmonic high frequency
Shake end time te；
Second acquisition module, for working as tmin≤te-t0≤tdWhen, the DC power transmission line voltage after the failure exists high
Frequency resonance, works as te-t0≥tdWhen, high-frequency resonant is not present in the DC power transmission line voltage after the failure；
Wherein, tminThe lower limiting value of the high-frequency resonant of DC power transmission line voltage, tdFor preset time setting value.
Specifically, the first acquisition module, including：
Third acquisition module obtains DC power transmission line for carrying out time-domain integration to PLC neutral point current sampled signals
Voltage variety；
Submodule is decomposed, for carrying out single scale to the DC power transmission line voltage variety using spline function small echo
Wavelet transformation, is broken down into low frequency component a (i) and high fdrequency component d (i), i=0,1 ... ..., n, and n is the sampling of recorded wave file
Moment sum.
Specifically, first determining module, including：
As the failure initial time at the time of maximum value in the modulus maximum sequence of the high fdrequency component is corresponded to
t0；
By failure initial time t in the modulus maximum sequence of the high fdrequency component0Modulus maximum corresponding to moment later
The closest initial time t more than zero and less than threshold value ζ0At the time of as the high-frequency resonant end time te。
Further, the determination unit, including：
Second determining module is described straight if there are high-frequency resonants for the DC power transmission line voltage after the failure
Window T when flowing the accident analysis of transmission line of electricityc=te-t0；
Third determining module, it is described if high-frequency resonant is not present for the DC power transmission line voltage after the failure
Window T when the accident analysis of DC power transmission linec=ke-t0；Wherein, keFor the DC power transmission line event after failure initial time
The inflection point moment of the steady-state component of voltage variety after barrier.
Specifically, after direct current transmission line fault after determining failure initial time as the following formula voltage variety stable state
The inflection point moment k of componente：
Wherein, ke∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ke) it is ktheMoment
The second dervative of low frequency component, a " (ke+ δ) it is ktheThe second dervative of the low frequency component at+δ moment, a " (ke- δ) it is ktheWhen-δ
Carve the second dervative of low frequency component.
Further, the judging unit, is used for：
Window T when high-frequency resonant and the accident analysis is not present in DC power transmission line voltage after failurecInterior accumulative electricity
Variable quantity is pressed to be more than or equal to threshold value ξ1When, then the faulty generation of DC power transmission line；Or
There are window T when high-frequency resonant and the accident analysis for DC power transmission line voltage after failurecInterior voltage becomes
The fault component gross energy of change amount is more than or equal to threshold value ξ2When, then the faulty generation of DC power transmission line.
Specifically, window T when determining the accident analysis as the following formulacInterior accumulation voltage variation delta uf：
uf(i) it is the fault component of DC power transmission line, i=0,1 ... ..., n, n are that the sampling instant of recorded wave file is total
Number.
Specifically, window T when determining the accident analysis as the following formulacThe fault component gross energy Δ E of interior voltage variety：
Wherein, the fault component u of the DC power transmission line is determined as the following formulaf(i)：
Wherein, a (t0) it is t0The low frequency component at moment, a (t0- 1) it is t0The low frequency component at -1 moment, ksWhen initial for failure
The steady-state component inflection point moment of voltage variety, a (k before direct current transmission line fault before quarters) it is ksThe low frequency at moment point
Amount, TfFor failure presteady state signal duration, Tf=t0-ks。
Specifically, before direct current transmission line fault before determining failure initial time as the following formula voltage variety stable state
Component inflection point moment ks：
Wherein, ks∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ks) it is kthsMoment
The second dervative of low frequency component, a " (ks+ δ) it is kthsThe second dervative of+δ moment low frequency components, a " (ks- δ) it is kths- δ the moment
The second dervative of low frequency component.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, the application can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to method, the flow of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail with reference to above-described embodiment for pipe, those of ordinary skills in the art should understand that：Still
The specific implementation mode of the present invention can be modified or replaced equivalently, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement should all cover within the claims of the present invention.
Claims (11)
1. a kind of DC power transmission line traveling wave fault location device starts method, which is characterized in that the method includes：
The DC power transmission line voltage condition after failure is obtained according to DC power transmission line voltage variety；
Window when determining the accident analysis of the DC power transmission line according to the DC power transmission line voltage condition after failure；
Judged according to the voltage variety of the DC power transmission line in window when the accident analysis of the DC power transmission line described straight
Flowing transmission line of electricity, whether failure starts traveling wave fault location device when the direct current transmission line fault.
2. the method as described in claim 1, which is characterized in that described to obtain failure according to DC power transmission line voltage variety
DC power transmission line voltage condition afterwards, including：
Obtain the low frequency component and height of the DC power transmission line voltage variety and the DC power transmission line voltage variety
Frequency component；
Failure initial time t is determined according to the modulus maximum of the high fdrequency component0And high-frequency resonant end time te；
Work as tmin≤te-t0≤tdWhen, there are high-frequency resonants for the DC power transmission line voltage after the failure, work as te-t0≥tdWhen,
High-frequency resonant is not present in DC power transmission line voltage after the failure；
Wherein, tminThe lower limiting value of the high-frequency resonant of DC power transmission line voltage, tdFor preset time setting value.
3. method as claimed in claim 2, which is characterized in that described to obtain the DC power transmission line voltage variety and institute
The low frequency component and high fdrequency component of DC power transmission line voltage variety are stated, including：
Time-domain integration is carried out to PLC neutral point current sampled signals, obtains DC power transmission line voltage variety；
Single scale wavelet transformation is carried out to the DC power transmission line voltage variety using spline function small echo, is broken down into
Low frequency component a (i) and high fdrequency component d (i), i=0,1 ... ..., n, n are the sampling instant sum of recorded wave file.
4. method as claimed in claim 2, which is characterized in that the modulus maximum according to the high fdrequency component determines failure
Initial time t0And high-frequency resonant end time te, including：
As the failure initial time t at the time of maximum value in the modulus maximum sequence of the high fdrequency component is corresponded to0；
By failure initial time t in the modulus maximum sequence of the high fdrequency component0The modulus maximum corresponding to the moment is more than zero later
And the closest initial time t less than threshold value ζ0At the time of as the high-frequency resonant end time te。
5. the method as described in claim 1, which is characterized in that described true according to the DC power transmission line voltage condition after failure
The window when accident analysis of the fixed DC power transmission line, including：
If DC power transmission line voltage after the failure is there are high-frequency resonant, when the accident analysis of the DC power transmission line
Window Tc=te-t0；
If high-frequency resonant, the accident analysis of the DC power transmission line is not present in the DC power transmission line voltage after the failure
When window Tc=ke-t0；Wherein, keFor the stable state point of voltage variety after the direct current transmission line fault after failure initial time
The inflection point moment of amount.
6. method as claimed in claim 5, which is characterized in that determine the DC transmission line after failure initial time as the following formula
The inflection point moment k of the steady-state component of voltage variety after the failure of roade：
Wherein, ke∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ke) it is ktheMoment low frequency
The second dervative of component, a " (ke+ δ) it is ktheThe second dervative of the low frequency component at+δ moment, a " (ke- δ) it is kthe- δ the moment is low
The second dervative of frequency component.
7. the method as described in claim 1, which is characterized in that the window when accident analysis according to the DC power transmission line
The voltage variety of interior DC power transmission line judge the DC power transmission line whether failure, when the DC power transmission line therefore
When barrier, start traveling wave fault location device, including：
Window T when high-frequency resonant and the accident analysis is not present in DC power transmission line voltage after failurecInterior accumulation voltage variation
Amount is more than or equal to threshold value ξ1When, then the faulty generation of DC power transmission line；Or
There are window T when high-frequency resonant and the accident analysis for DC power transmission line voltage after failurecInterior voltage variety
Fault component gross energy is more than or equal to threshold value ξ2When, then the faulty generation of DC power transmission line.
8. the method for claim 7, which is characterized in that window T when determining the accident analysis as the following formulacInterior accumulation voltage
Variation delta uf：
uf(i) it is the fault component of DC power transmission line, i=0,1 ... ..., n, n are the sampling instant sum of recorded wave file.
9. method as claimed in claim 8, which is characterized in that window T when determining the accident analysis as the following formulacInterior voltage becomes
The fault component gross energy Δ E of change amount：
Wherein, the fault component u of the DC power transmission line is determined as the following formulaf(i)：
Wherein, a (t0) it is t0The low frequency component at moment, a (t0- 1) it is t0The low frequency component at -1 moment, ksFor failure initial time it
The steady-state component inflection point moment of voltage variety, a (k before preceding direct current transmission line faults) it is ksThe low frequency component at moment, Tf
For failure presteady state signal duration, Tf=t0-ks。
10. method as claimed in claim 9, which is characterized in that determine the direct current transportation before failure initial time as the following formula
The steady-state component inflection point moment k of voltage variety before line faults：
Wherein, ks∈ [0, n], n are the sampling instant sum of recorded wave file, and δ is width neighborhood, a " (ks) it is kthsMoment low frequency
The second dervative of component, a " (ks+ δ) it is kthsThe second dervative of+δ moment low frequency components, a " (ks- δ) it is kths- δ moment low frequencies
The second dervative of component.
11. a kind of DC power transmission line traveling wave fault location device activation system, which is characterized in that the system comprises：
Acquiring unit, for according to the DC power transmission line voltage condition after DC power transmission line voltage variety acquisition failure；
Determination unit, the failure point for determining the DC power transmission line according to the DC power transmission line voltage condition after failure
Window when analysis；
Judging unit is used for the voltage change of the DC power transmission line when accident analysis according to the DC power transmission line in window
Amount judges whether failure starts traveling wave fault location device to the DC power transmission line when the direct current transmission line fault.
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