CN108663602A - Flexible direct current power distribution network monopole failure line selection and Section Location and system - Google Patents
Flexible direct current power distribution network monopole failure line selection and Section Location 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a kind of flexible direct current power distribution network monopole failure line selections and Section Location and system, including：Each feeder line positive and negative electrode electric current of DC power distribution line is acquired, it is filtered；The jump-value of current data in data window are extracted, S-transformation is carried out to it, obtains the multiple time-frequency s-matrix of current signal；According to line parameter circuit value, characteristic spectra is calculated；According to multiple time-frequency s-matrix, STCFB and W is calculated；The monopole failure line selection criterion and section orientation criterion for establishing DC distribution feeder line carry out the identification of the fault feeder based on jump-value of current Pearson correlation coefficient according to route selection criterion；If fault feeder, compare transient state energy and the judgement of progress failure pole of positive and negative electrode jump-value of current characteristic spectra；If failure polar curve, fault feeder section identification is carried out using jump-value of current correlation at left and right sides of each feeder line section.The present invention is not by transition resistance, data are asynchronous and the factors such as abort situation are influenced, rapid sensitive and reliable.
Description
Technical field
The present invention relates to DC distribution net failure line selection and field of locating technology, and in particular to a kind of flexible direct current power distribution network
Monopole failure line selection and Section Location and system.
Background technology
With the rapid development of power electronic devices and the wilderness demand of regenerative resource, based on the straight of voltage source converter
It is fast-developing to flow transmission and disttrbution technology.Straightening stream (Medium-Voltage DC, MVDC) power distribution network is damaged with circuit in flexibility
Consume the features such as small, power supply efficiency is high, power quality is excellent, distributed generation resource it is grid-connected, construct city DC grid etc. advantage
Significantly.Since modularization multi-level converter (modular multilevel converter, MMC) switching frequency is low, loss
Small, dynamic static state voltage equipoise is excellent, thus is more favored in flexible direct current engineering.The DC engineering for being currently based on MMC mostly uses nature
Bipolar, small current neutral grounding mode, in Shenzhen, the ± 10kV DC distribution engineerings of pilot use converter transformer valve side high grounding.
When monopole failure occurs for the DC distribution net feeder line of small current neutral grounding mode, it is characterized in that：1. failure pole tension
It is reduced to zero, it is original 2 times that non-faulting pole tension, which increases, carrys out security risk to the insulating tape of DC distribution net；2. the event of failure pole
Hinder electric current very small (being only the capacitance current of feeder line) causes failure line selection difficult with normal duty electric current no significant difference.Class
The method of operation after singlephase earth fault occurs like exchange distribution, although DC distribution net can still be transported in short-term after monopole failure occurs
Row a period of time, but since failure does not exclude, be still required for quickly and accurately selecting out of order feeder line and its fault section,
So as to timely isolated fault feeder line, ensure the safe operation in non-faulting region.
The prior art judges by comparing the correlation of electric current and consecutive roots line current at two level VSC bulky capacitors in area
Outer failure.However, since MMC capacitances point are in submodule, submodule capacitance does not have discharge loop when monopole is grounded, and method is not
It is applicable in.
The prior art detects DC line fault using the voltage change ratio at current-limiting reactor both ends, but this method is in power
Rotection thresholds need to adjust again under Reversion, and install direct current reactor in DC distribution net and do not have universal significance.
The prior art calculates equivalent reactance value using least square method, but is difficult to specifically present in multiple-limb system
Line.
Prior art comprehensive utilization failure reaches the polarity of fault current threshold value first when occurring, the two poles of the earth fault current arrives
Three kinds of criterions of rate are changed with time to detect internal fault external fault up to the time difference of threshold value and electric current, and method is excessively complicated.
The prior art builds zero block net and identifies circuit capacitance parameter, can effectively differentiate out of order feeder line, but difficult
With the fault section on positioning failure feeder line.
The prior art carries out multiscale analysis using wavelet transformation, is sentenced using the low-and high-frequency capacity volume variance construction of transient
According to, the correct failure judgement of energy, but the result of calculation of wavelet transformation is vulnerable to wavelet basis selection and the influence of noise.
In summary, existing DC grid monopole fault recognition method respectively has a feature, but without it is highly reliable, not by transition
The method of the influences such as resistance and high sensitivity.
Invention content
To solve the above-mentioned problems, the invention discloses a kind of flexible direct current power distribution network monopole failure line selections and section to position
Method and system；After monopolar grounding fault occurs, jump-value of current derives from the charge and discharge of distributed capacitor on DC feeder
Electric current.Wherein, the waveform of positive and negative anodes line current Sudden Changing Rate is negatively correlated on fault feeder, and is in then positive on non-faulting feeder line
Close, thus construct based on S-transformation characteristic spectra (S-transform characteristics frequency band,
) and the monopole failure line selection criterion of Pearson correlation coefficient STCFB.According to positive and negative anodes jump-value of current characteristic spectra energy
Ratio difference in size constructs the identical criterion of failure pole.In addition, utilizing each section both sides jump-value of current characteristic spectra
Pearson correlation coefficient carries out fault section location.This method is fast and effective, and abort situation, two end datas are asynchronous and mistake
The factors such as resistance are crossed to have little effect criterion, it is sensitive reliable.
To achieve the above object, concrete scheme of the invention is as follows：
The first object of the present invention is to disclose a kind of flexible direct current power distribution network monopole failure line selection and Section Location, packet
Include following steps：
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
Jump-value of current data before and after extraction failure in set period of time respectively, carry out the jump-value of current signal
S-transformation obtains the multiple time-frequency s-matrix of jump-value of current signal；
According to the characteristic frequency section of route parameter calculation jump-value of current；Since jump-value of current is a kind of continuous frequency spectrum letter
Number, the low frequency part of signal is easily influenced by load current, high frequency section again easily due to amplitude versus frequency characte reaches resonance peak by
To Line Attenuation.Therefore, in order to improve the sensitivity of recognition methods, the characteristic frequency section of clear jump-value of current is needed；
According to multiple time-frequency s-matrix, S-transformation energy in the STCFB and STCFB of calculating current Sudden Changing Rate signal；
The fault feeder identification that DC distribution net is established according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to identifying fault feeder；
For the fault feeder identified, compare the transient state energy and progress failure of positive and negative electrode jump-value of current STCFB
The judgement of pole；
The fault section that fault feeder is identified according to STCFB and Pearson correlation coefficient, to complete section positioning.
Further, it is respectively 500Hz according to the upper limit value and lower limit value of the characteristic frequency section of route parameter calculation jump-value of current
And 4000Hz.
Further, the STCFB of the calculating current Sudden Changing Rate, specially：
Wherein, the multiple time-frequency s-matrix of jump-value of current signal is denoted as Sa[p, q], q are column vector, indicate signal at certain
The amplitude versus frequency characte of one moment q；P is row vector, indicates signal time domain specification at a certain frequency p；fmin、fmaxIt is taken as feature respectively
Frequency range bound frequency values；S [p, q] is S-transformation element value of the particular moment q input signal at specific frequency p；Pass through calculating
The S [q] at each moment can draw out S-transformation characteristic spectra waveform；
S [p, q] is a p row q column matrix, and q is time coordinate, represents 1 to 50 in data window 2ms in the present invention
Sampled point；P is then frequency coordinate, takes 500-4000 totally 8 stepped-frequency signals herein.
S [q] is an ordered series of numbers, indicates the S-transformation characteristic spectra STCFB corresponding to q-th of sampled point, has done one here
Summation, is exactly S [q]=S [500, q]+S [1000, q]+S [1500, q] ... .+S [4000, q].In matrix q-th of moment
All numbers of the corresponding frequency (p) from 500 to 4000 are added.Q gets 50 from 1, indicates which sampled point.
Further, S-transformation energy in the characteristic spectra of the calculating current Sudden Changing Rate signal, specially：
It is S [p, q] to define S-transformation element values of the particular moment input signal q at specific frequency p, and transient state energy is：
E (p, q)=abs (S [p, q])
It based on sampled value principle, sums to the transient state energy of all sampled points in STCFB, obtains signal S at STCFB and become
Change transient state energy and W：
fmin、fmaxIt is taken as characteristic spectra bound frequency values respectively, N represents the sum of sampled point in data window.
Further, Pearson correlation coefficient is specially：
Wherein, S1(q), S2(q) be respectively feeder line positive and negative anodes line current Sudden Changing Rate signal S-transformation characteristic spectra STCFB.
Further, the failure that DC distribution net is established according to S-transformation characteristic spectra and Pearson correlation coefficient
Feeder line identical criterion, specially：
Assuming that the Pearson correlation coefficient of description feeder line positive and negative anodes line current Sudden Changing Rate similarity degree is ρfi, i=1,2,3,
4, then it is as follows to construct fault feeder selecting criterion：
Work as satisfaction：ρfi＜ kfWhen, this feeder line is fault feeder；
If conversely,：ρfi＞ kf, then it is non-faulting feeder line.
Wherein, kfFor setting valve.
Further, the transient state energy of the comparison positive and negative electrode jump-value of current characteristic frequency section and progress failure pole
Judgement, specially：
Calculate positive and negative electrode circuit transient state energy and, be denoted as W respectivelypiAnd Wni；Define the W that feeder line head end measurespiAnd Wni
Ratio be λi；
Work as λi＞ 1+kWHWhen, judgement feeder line anode breaks down；
Work as λi＜ 1-kWLWhen, judgement feeder line cathode breaks down；
Wherein, kWL、kWHSafety factor is indicated respectively.
Further, described to utilize the failure that fault feeder is identified according to S-transformation characteristic spectra and Pearson correlation coefficient
Section, specially：
Define ρlFor the Pearson correlation coefficient of S-transformation characteristic spectra at left and right sides of characterization feeder line section；
When section internal fault：ρl＞ kl；
When failure outside section：ρl＜ kl；
Wherein, klTo set threshold.
The second object of the present invention is to disclose a kind of flexible direct current power distribution network monopole failure line selection and section positioning system, packet
It includes：Server, the server include memory, processor and storage on a memory and the calculating that can run on a processor
Machine program, the processor realize following steps when executing described program：
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
Jump-value of current data before and after extraction failure in set period of time respectively, carry out the jump-value of current signal
S-transformation obtains the multiple time-frequency s-matrix of jump-value of current signal；
According to the characteristic frequency section of route parameter calculation jump-value of current；
According to multiple time-frequency s-matrix, S-transformation energy in the STCFB and STCFB of calculating current Sudden Changing Rate signal；
The fault feeder identification that DC distribution net is established according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to identification fault feeder；
For the fault feeder identified, compare the transient state energy and progress failure of positive and negative electrode jump-value of current STCFB
The judgement of pole；
The fault section that fault feeder is identified using STCFB and Pearson correlation coefficient, to complete fault section location.
The third object of the present invention is to disclose a kind of computer readable storage medium, is stored thereon with computer program, should
Following steps are executed when program is executed by processor：
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
Jump-value of current data before and after extraction failure in set period of time respectively, carry out the jump-value of current signal
S-transformation obtains the multiple time-frequency s-matrix of jump-value of current signal；
According to the characteristic frequency section of route parameter calculation jump-value of current；
According to multiple time-frequency s-matrix, S-transformation energy in the STCFB and STCFB of calculating current Sudden Changing Rate signal；
The fault feeder identification that DC distribution net is established according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to identification fault feeder；
For the fault feeder identified, compare the transient state energy and progress failure of positive and negative electrode jump-value of current STCFB
The judgement of pole；
Using the fault section for identifying fault feeder according to STCFB and Pearson correlation coefficient, to complete section positioning.
Beneficial effects of the present invention：
(1) selected line method is not borrowed using fault transient capacitance current feature selecting fault feeder, positioning failure section
Help DC line boundary, adaptability stronger；
(2) under various failure primary condition it is reliable, rapidly identify fault direction, transition resistance, data it is asynchronous with
And the factors such as abort situation have little effect criterion, reliability, sensitivity are high；
(3) method analyzes jump-value of current characteristic frequency, comprehensively utilizes the phase of all data frequency components in data window
Position information and amplitude information overcome and are easily disturbed problem when detecting failure using single piece of information；
(4) recognition methods principle is simple, clear, and identification is accurate, is easy to Project Realization, has higher practical value.
Description of the drawings
Fig. 1 is that DC distribution net simplifies equivalent circuit；
The distribution map of capacitance current when Fig. 2 is DC line monopole failure；
Fig. 3 is that monopolar D. C feeder line simplifies equivalent network；
Fig. 4 is the fault identification functional block diagram of the present invention；
Fig. 5 (a)-(d) is respectively f1The STCFB waveforms of each feeder line positive and negative anodes head end electric current Sudden Changing Rate when failure；
Fig. 6 (a)-(b) is respectively f1A when failure1B1、B1C1Simulation result in section；
Fig. 7 (a)-(b) is respectively B2C2A when different location failure2B2、B2C2The ρ of sectionlCurve.
Specific implementation mode：
The present invention is described in detail below in conjunction with the accompanying drawings：
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.Additionally, it should be understood that when in the present specification use term "comprising" and/
Or when " comprising ", existing characteristics, step, operation, device, component and/or combination thereof are indicated.
In order to solve the problems, such as background technology, the invention discloses a kind of choosings of flexible direct current power distribution network monopole failure
Line and Section Location, as shown in figure 4, including the following steps：
(1) each feeder line zone detection element acquires electric current at left and right sides of feeder line section in real time；
(2) 0.5ms before failure will be extracted after the current filtering of acquisition, the jump-value of current of 1.5ms after failure；
(3) each feeder line section both sides detecting element carries out S-transformation to jump-value of current, obtains the multiple time-frequency S squares of each signal
Battle array, seeks the STCFB and energy W of each signal respectively；
(4) route selection criterion is constructed, according to the ρ for describing each feeder line positive and negative anodes jump-value of current degree of correlationfi, complete based on electricity
Flow the fault feeder identification of Sudden Changing Rate STCFB and Pearson correlation coefficient；
Fault feeder recognition principle is：
When monopolar grounding fault occurs for middle straightening stream (MMC-MVDC) system based on modularization multi-level converter, failure
Feeder line is identical with non-faulting feeder line steady state voltage, fault current very little, can not effectively identify and connect only with steady state voltage and electric current
Ground feeder line.It needs to analyze each feeder current Sudden Changing Rate.
Circuit transient voltage generates decaying when the intrinsic frequency variation parameter characteristics of transmission line of electricity make MMC-MVDC monopoles be grounded
Oscillatory process causes the direct-to-ground capacitance being distributed on circuit to generate the electric current from earth point inflow and outflow.If monopole occurs for Fig. 1 distributions
Earth fault, the capacitance current distribution on feeder line is as shown in Fig. 2, MMC uses DC side clamp resistance earthing mode in figure.With
Feeder line section B1C1It is analyzed for positive or negative pole monopole failure, to obtain the transient characteristic of fault feeder and normal feeder line
Difference.
In Fig. 2, { up,unPositive and negative anodes busbar voltage, { i are indicated respectivelyp1,in1},{ipk,inkIt is respectively fault feeder, strong
The positive and negative electrode current (k=2,3,4) of health feeder line, iL1,iLkThe respectively load current of fault feeder, healthy feeder terminal.If
B1C1Duan Fasheng plus earth failures, such as f in Fig. 21Point, positive and negative anodes generate negative pressure drop i.e. Δ u<0, positive and negative anodes circuit at this time
Capacitance is required to discharge, and capacitance current can flow to earth point by circuit；Similarly, when cathode breaks down, such as dotted line institute in Fig. 2
Show, positive and negative anodes circuit capacitance is required to charge, and positive and negative anodes circuit capacitance current can flow to circuit by earth point.Above-mentioned analytical table
Bright, positive and negative anodes capacitance current is consistent relative to the direction of earth point inflow and outflow, does not offset each other.
System fault-free circuit when due to earth fault, earth point fault current is only by each DC feeder transient state direct-to-ground capacitance
Electric current is constituted, it is specified that electric current positive direction, which is busbar, is directed toward circuit, for fault point f1, can be obtained according to Kirchhoff's current law (KCL)：
In formula, ifTo flow to current in the fault point, i from circuitC1i、iCkiRespectively fault feeder and non-faulting feeder line is electric over the ground
Capacitance current.It is respectively Δ i to define non-faulting feeder line positive and negative electrode jump-value of currentpk、Δink, then：
Wherein, { ipLk,inLkIt is respectively the positive and negative polar curve head end electric current steady-state component of non-faulting feeder line.For fault feeder,
By taking positive electrode fault as an example, failure definition feeder line positive and negative electrode head end electric current Sudden Changing Rate is respectively Δ ip1、Δin1, enable { ipL1,inL1}
Respectively fault feeder positive and negative anodes line current steady-state component.Then：
Cathode failure analysis methods are similar, do not repeat.As it can be seen that when monopole failure occurs for feeder line, fault feeder is positive and negative
Pole head end electric current Sudden Changing Rate direction on the contrary, and failure polar curve head end electric current Sudden Changing Rate be much larger than non-faulting polar curve；And non-faulting is presented
Line positive and negative anodes head end electric current Sudden Changing Rate direction is identical, and size approximately equal, waveform is approximately positive correlation, can identify that failure is presented according to this
Line and failure pole.
(5) if being identified as fault feeder, S-transformation transient state energy and positive and negative anodes energy ratio in characteristic spectra, structure are calculated
Make failure pole identical criterion；
(6) Pearson correlation coefficient for calculating jump-value of current at left and right sides of each section of failure polar curve, constructs fault section
Identical criterion；
Fault section recognition principle is：
1) feeder line section internal fault.By taking feeder line in Fig. 11 as an example, monopolar D. C feeder line as shown in Figure 3 can be obtained and simplify equivalent electricity
Road.Since distribution network load disperses to access along feeder line, when downstream fault, should ensure that upstream feeder line normal power supply.Still with f1Point
For positive electrode fault occurs, cathode failure is similar, repeats no more.For ease of analysis, it is just to be still directed toward circuit with busbar
Direction.According to principle of stacking, B1C1When positive electrode fault, it is equivalent to and adds a negative voltage source Δ u in fault pointf1, failure is attached
Screening network is as shown in Figure 3.Wherein, ΔIB1C1、ΔIC1B1Respectively B1、C1The jump-value of current that side detects, this is also by circuit
Distribution capacity electric discharge generates.It is smaller on jump-value of current influence since DC distribution net feeder line segment length is shorter, therefore basis
Provide positive direction, R13、R14The jump-value of current waveform detected is approximately positive correlation.
2) the outer failure of feeder line section.With B in Fig. 31C1For, due between each section of same feeder line without specific boundary, electricity
Wave is flowed almost without barrier in A1B1、B1C1It is propagated between section, R11、R12The shape of place's current wave signal should be approximately negatively correlated.
When feeder line section internal fault, the jump-value of current waveform of circuit both sides is approximately positive correlation；And the outer event of feeder line section
When barrier, the jump-value of current waveform of circuit both sides is approximately negatively correlated.
In above-mentioned steps, knowledge of the system both sides identification device installation place for fault feeder, failure pole and fault section
Other flow is：
After failure occurs, as the ρ of feeder linefiLess than threshold value kWHWhen, judge feeder line for fault feeder；When λ is less than threshold value
kWLWhen, cathode failure is judged, when λ is more than threshold value kWHWhen, it is judged to positive electrode fault；Work as ρlMore than threshold value klWhen, judge feeder line
Section is fault section, is less than threshold value klWhen, judgement feeder line section is non-faulting section.
Flexible direct current power system simulation model is built using PSCAD, simulating, verifying is carried out to institute's extracting method：
1) model is established
In order to make Future Power System develop into the advanced system of an alternating current-direct current series-parallel connection, the medium-voltage distribution of DC distribution
Backbone network will be based on ± 10kV networks, and low-pressure section will be with the appliance load of the industrial load and 400V of the ± 750V of user side
Based on.Compared to both-end and loop network, radial structure is in the data center DC distribution relatively low to reliability requirement
Net and residential building direct current distribution are more applicable.Therefore typically load containing alternating current-direct current and distributed generation resource are established shown in Fig. 1
Radial DC distribution net topology.
The monopolar grounding fault of different location, the performance of extracting method to test are set in a model.This paper sample frequencys
For 25kHz, data window 2ms, systematic parameter is as shown in table 1, and line parameter circuit value is as shown in table 2.
1 system parameter table of table
| Systematic parameter title | Numerical value |
| AC supply voltage/kV | 110 |
| Ac rated voltage/kV | 10 |
| Current conversion station rated capacity/MVA | 5 |
| Photovoltaic rated capacity/MVA | 0.25 |
| Energy storage device/MW | 0.25 |
| Transverter level number | 11 |
| Submodule capacitance/μ F | 1000 |
| Bridge arm reactance/mH | 6.4 |
2 line parameter circuit value table of table
| System feeder line parameter | Numerical value |
| Line impedance Ω/km | 0.125 |
| Line inductance mH/km | 0.72 |
| Line mutual-ground capacitor μ F/km | 0.0048 |
| AkBk, BkCk/km (k=1,2,3,4) | 10 |
2) metallicity monopole fault simulation
In B1C1Section midpoint f1Cathode metal earth fault, STCFB waveforms such as Fig. 5 of each feeder line positive and negative anodes are set
(a) shown in-(d).Each feeder line simulation result is as shown in table 3.
3 f of table1Feeder line simulation result when failure
4 f of table1Failure pole and fault section simulation result when failure
In Fig. 5 (a)-(d), { Δ ip1,Δin1},{Δip2,Δin2},{Δip3,Δin3},{Δip4,Δin4Generation respectively
Table feeder line F1-F4The jump-value of current of positive and negative anodes head end.From fig. 5, it can be seen that feeder line F2-F4Positive and negative anodes head end electric current Sudden Changing Rate
STCFB waveform approximations be proportionate, and feeder line F1The STCFB waveform approximations of positive and negative anodes head end electric current Sudden Changing Rate are negatively correlated.
By ρ in table 3fData are it is found that feeder line 1 is fault feeder.Meanwhile the λ of feeder line 1 is 4.4457, therefore, it is determined that anode occurs for feeder line 1
Earth fault.
To feeder line 1A1B1And B1C1The STCFB of both sides anode jump-value of current is analyzed after section fault, failure pole
With shown in fault section simulation curve such as Fig. 6 (a)-(b), emulation data are as shown in table 4.
It can be seen from the figure that A1B1The waveform approximation for the STCFB that both sides detect is negatively correlated, B1C1Both sides detect
The waveform approximation of STCFB be proportionate, by ρ in table 4lData may determine that B1C1Earth fault occurs for section anode.
3) simulation and analysis of different faults primary condition
1) different transition resistances.In feeder line B1C1Cathode f2The failure of different transition resistances is respectively set in place, and fault feeder is sentenced
The results are shown in Table 5, and failure pole and fault section differentiate that the results are shown in Table 6.
Feeder line simulation result under the different transition resistances of table 5
As shown in Table 5, in different transition resistances, it can differentiate feeder line F1For fault feeder.Event to the feeder line
Hinder pole and fault section testing result is as shown in table 6.
Feeder line simulation result under the different transition resistances of table 6
By in table 6 emulate data it is concluded that：In different transition resistances, system both sides can correctly judge
Fault direction and failure pole.
2) the asynchronous influence emulation of data.Since this programme needs feeder line section both ends into row data communication, wave is inevitably caused
Graphic data is asynchronous.Therefore, in f220 Ω transition resistances of place's setting, analyze feeder line section A under data out of step conditions1B1And B1C1
Both sides STCFB waveforms, obtain result shown in table 7.
Fault section simulation result under 7 data out of step conditions of table
As can be seen from the above table, Wave data is asynchronous to ρlThere is certain influence, but influence very little, still has more highly sensitive
Degree.
3) different faults position emulates.In feeder line section B2C2Anode setting different location failure, it is 20 Ω to take transition resistance,
To A2B2、B2C2The correlation of the STCFB of the left and right sides is analyzed, shown in obtained simulation result such as Fig. 7 (a)-(b), horizontal seat
Mark indicates fault point to B2Distance, known by Fig. 7 (a)-(b), in section different location failure, can correctly judge to be out of order
Section, and sensitivity is higher.
4) exchange side failure.In ac bus f4Place's setting different type short trouble, simulation result are as shown in table 8.
8 exchange side fault simulation of table
From the data in table 8, it can be seen that the various fault types to being happened at exchange side, can all be determined as the outer failure of feeder line, differentiate
As a result accurate.
The above simulation result shows under various fault conditions, can correct decision failure.Demonstrate theory analysis and route selection
The correctness of criterion.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. flexible direct current power distribution network monopole failure line selection and Section Location, which is characterized in that include the following steps：
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
Jump-value of current data before and after extraction failure in set period of time respectively, S changes are carried out to the jump-value of current signal
It changes, obtains the multiple time-frequency s-matrix of jump-value of current signal；
According to the characteristic frequency section of route parameter calculation jump-value of current；Since jump-value of current is a kind of continuous frequency spectrum signal,
The low frequency part of signal is easily influenced by load current, and high frequency section is again easily due to amplitude versus frequency characte reaches resonance peak by line
Decay on road.Therefore, in order to improve the sensitivity of recognition methods, the characteristic frequency section of clear jump-value of current is needed；
According to multiple time-frequency s-matrix, S-transformation energy in the STCFB and STCFB of calculating current Sudden Changing Rate signal；
The fault feeder identical criterion of DC distribution net is established according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient,
Identify fault feeder；
For the fault feeder identified, compare the transient state energy of positive and negative electrode jump-value of current STCFB with progress failure pole
Judge；
The fault section that fault feeder is identified according to STCFB and Pearson correlation coefficient, to complete section positioning.
2. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that root
Upper limit value and lower limit value according to the characteristic frequency section of route parameter calculation jump-value of current is respectively 500Hz and 4000Hz.
3. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that institute
The STCFB for the calculating current Sudden Changing Rate stated, specially：
Wherein, the multiple time-frequency s-matrix of jump-value of current signal is denoted as Sa[p, q], q are column vector, indicate signal at a time
The amplitude versus frequency characte of q；P is row vector, indicates signal time domain specification at a certain frequency p；fmin、fmaxIt is taken as on characteristic spectra respectively
Lower limit frequency value；S [p, q] is S-transformation element value of the particular moment q input signal at specific frequency p；When by calculating each
The S [q] at quarter can draw out S-transformation characteristic spectra waveform；S [q] is an ordered series of numbers, is indicated corresponding to q-th of sampled point
STCFB。
4. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that institute
S-transformation energy in the characteristic spectra for the calculating current Sudden Changing Rate signal stated, specially：
It is S [p, q] to define S-transformation element values of the particular moment input signal q at specific frequency p, and transient state energy is：
E (p, q)=abs (S [p, q])
Based on sampled value principle, sums to the transient state energy of all sampled points in STCFB, it is temporary to obtain signal S-transformation at STCFB
State energy and W：
fmin、fmaxIt is taken as characteristic spectra bound frequency values respectively, N represents the sum of sampled point in data window.
5. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that
Pearson correlation coefficient is specially：
Wherein, S1(q), S2(q) be respectively feeder line positive and negative anodes line current Sudden Changing Rate signal S-transformation characteristic spectra STCFB.
6. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that institute
That states establishes the fault feeder identical criterion of DC distribution net according to S-transformation characteristic spectra and Pearson correlation coefficient, specifically
For：
Assuming that the Pearson correlation coefficient of description feeder line positive and negative anodes line current Sudden Changing Rate similarity degree is ρfi, i=1,2,3,4, then
It is as follows to construct fault feeder selecting criterion：
Work as satisfaction：ρfi＜ kfWhen, this feeder line is fault feeder；
If conversely,：ρfi＞ kf, then it is non-faulting feeder line；
Wherein, kfFor setting valve.
7. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that institute
The transient state energy for the comparison positive and negative electrode jump-value of current characteristic frequency section stated and, carry out the judgement of failure pole, specially：
Calculate positive and negative electrode circuit transient state energy and, be denoted as W respectivelypiAnd Wni；Define the W that feeder line head end measurespiAnd WniRatio
Value is λi；
Work as λi＞ 1+kWHWhen, judgement feeder line anode breaks down；
Work as λi＜ 1-kWLWhen, judgement feeder line cathode breaks down；
Wherein, kWL、kWHSafety factor is indicated respectively.
8. flexible direct current power distribution network monopole failure line selection as described in claim 1 and Section Location, which is characterized in that institute
It states using the fault section for identifying fault feeder according to S-transformation characteristic spectra and Pearson correlation coefficient, specially：
Define ρlFor the Pearson correlation coefficient of S-transformation characteristic spectra at left and right sides of characterization feeder line section；
When section internal fault：ρl＞ kl；
When failure outside section：ρl＜ kl；
Wherein, klTo set threshold.
9. flexible direct current power distribution network monopole failure line selection and section positioning system, which is characterized in that including：Server, the clothes
Business device include memory, processor and storage on a memory and the computer program that can run on a processor, the processing
Device realizes following steps when executing described program：
Flexible direct current power distribution network monopole failure line selection and Section Location, which is characterized in that include the following steps：
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
Jump-value of current data before and after extraction failure in set period of time respectively, S changes are carried out to the jump-value of current signal
It changes, obtains the multiple time-frequency s-matrix of jump-value of current signal；
According to route parameter calculation jump-value of current characteristic frequency section；
According to multiple time-frequency s-matrix, S-transformation energy in the S-transformation characteristic spectra STCFB and characteristic spectra of calculating current Sudden Changing Rate signal
Amount；
The fault feeder section identification that DC distribution net is established according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to identification fault feeder；
For the fault feeder identified, compare the transient state energy and progress failure of positive and negative electrode jump-value of current characteristic frequency section
The judgement of pole；
Using the fault section for identifying fault feeder according to STCFB and Pearson correlation coefficient, to complete fault section location.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
Following steps are executed when execution：
Flexible direct current power distribution network monopole failure line selection and Section Location, which is characterized in that include the following steps：
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
Jump-value of current data before and after extraction failure in set period of time respectively, S changes are carried out to the jump-value of current signal
It changes, obtains the multiple time-frequency s-matrix of jump-value of current signal；
According to route parameter calculation jump-value of current characteristic frequency section；
According to multiple time-frequency s-matrix, S-transformation energy in the S-transformation characteristic spectra STCFB and characteristic spectra of calculating current Sudden Changing Rate signal
Amount；
The fault feeder section identification that DC distribution net is established according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to identification fault feeder；
For the fault feeder identified, compare the transient state energy and progress failure of positive and negative electrode jump-value of current characteristic frequency section
The judgement of pole；
It is fixed to complete section using the fault section for identifying fault feeder according to S-transformation characteristic spectra and Pearson correlation coefficient
Position.
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