CN108663602B - 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
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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
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The invention discloses a kind of flexible direct current power distribution network monopole failure line selections and Section Location and system, comprising: acquisition each feeder line positive and negative electrode electric current of DC power distribution line is filtered it；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, the identification of fault feeder section is carried out using jump-value of current correlation at left and right sides of each feeder 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 technique
With the rapid development of power electronic devices and the wilderness demand of renewable energy, 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 route 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 in terms of advantage
Significantly.Since modularization multi-level converter (modular multilevel converter, MMC) switching frequency is low, loss
It is small, it is excellent to move static state voltage equipoise, thus be 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 engineering of pilot uses 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
It is very small (the only capacitance current of feeder line) to hinder electric current, with normal duty electric current no significant difference, causes failure line selection difficult.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 quickly and accurately to select out of order feeder line and its fault section,
So as to timely isolated fault feeder line, guarantee the safe operation in non-faulting region.
The prior art determines in area by comparing the correlation of electric current and consecutive roots line current at two level VSC bulky capacitors
Outer failure.However, submodule capacitor does not have discharge loop when monopole is grounded, and method is not since MMC capacitor point is in submodule
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
It protects threshold value that need to adjust again under Reversion, and direct current reactor is installed in DC distribution net and does 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 when occurring first, 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 constructs zero block net and identifies route 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 can correctly judge failure, but the calculated result of wavelet transformation chooses vulnerable to wavelet basis 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.
Summary of the invention
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 on non-faulting feeder line is then in positive
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 two 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；
The jump-value of current data in the set period of time of failure front and back are extracted respectively, and the jump-value of current signal is carried out
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, influence of the low frequency part of signal vulnerable to load current, high frequency section again easily due to amplitude-frequency characteristic 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；
Sentenced according to the fault feeder identification that S-transformation characteristic spectra STCFB and Pearson correlation coefficient establish DC distribution net
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；
According to the fault section of STCFB and Pearson correlation coefficient identification fault feeder, to complete section positioning.
It further, 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, specifically:
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-frequency characteristic 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 upper and lower limit frequency value；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 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, specifically:
Defining S-transformation element value of the particular moment input signal q at specific frequency p is S [p, q], transient state energy are as follows:
E (p, q)=abs (S [p, q])
It based on sampled value principle, sums to the transient state energy of sampled points all in STCFB, obtains signal S at STCFB and become
Change transient state energy and W:
fmin、fmaxIt is taken as characteristic spectra upper and lower limit frequency value respectively, N represents the sum of sampled point in data window.
Further, Pearson correlation coefficient specifically:
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, specifically:
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；
Conversely, if: 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, specifically:
Calculate positive and negative electrode route 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, determine that feeder line anode breaks down；
Work as λi< 1-kWLWhen, determine that feeder line cathode breaks down；
Wherein, kWL、kWHRespectively indicate safety factor.
Further, the failure using according to S-transformation characteristic spectra and Pearson correlation coefficient identification fault feeder
Section, specifically:
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
Include: server, the server include memory, processor and storage on a memory and the calculating that can run on a processor
Machine program, the processor perform the steps of when executing described program
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
The jump-value of current data in the set period of time of failure front and back are extracted respectively, and the jump-value of current signal is carried out
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；
Sentenced according to the fault feeder identification that S-transformation characteristic spectra STCFB and Pearson correlation coefficient establish DC distribution net
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 of STCFB and Pearson correlation coefficient identification fault feeder, 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；
The jump-value of current data in the set period of time of failure front and back are extracted respectively, and the jump-value of current signal is carried out
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；
Sentenced according to the fault feeder identification that S-transformation characteristic spectra STCFB and Pearson correlation coefficient establish DC distribution net
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 according to STCFB and Pearson correlation coefficient identification fault feeder, to complete section positioning.
Beneficial effects of the present invention:
(1) selected line method utilizes fault transient capacitance current feature selecting fault feeder, positioning failure section, does not borrow
DC line boundary is helped, adaptability is 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 when detecting failure using single piece of information vulnerable to interference problem；
(4) recognition methods principle is simple, clear, and identification is accurate, is easy to Project Realization, practical value with higher.
Detailed description of the invention
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 fault identification functional block diagram of the invention；
Fig. 5 (a)-(d) is respectively f1The STCFB waveform 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 embodiment:
The present invention is described in detail with reference to the accompanying drawing:
It should be noted that term used herein above is merely to describe specific embodiment, 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 their combination are indicated.
In order to solve the problems, such as background technique, 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, comprising the following steps:
(1) each feeder section detecting element acquires electric current at left and right sides of feeder line section in real time；
(2) 0.5ms before failure after the current filtering of acquisition, will be extracted, the jump-value of current of 1.5ms after failure；
(3) each feeder line section two sides detecting element carries out S-transformation to jump-value of current, obtains the multiple time-frequency S square 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 are as follows:
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.
Route transient voltage generates decaying when the intrinsic frequency variation parameter characteristics of transmission line of electricity are grounded MMC-MVDC monopole
Oscillatory process causes the direct-to-ground capacitance being distributed on route to generate the electric current from grounding point inflow and outflow.If monopole occurs for Fig. 1 distribution
Ground 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 Yu normal feeder line
Difference.
In Fig. 2, { up,unRespectively indicate positive and negative anodes busbar voltage, { ip1,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 failure, such as f in Fig. 21Point, positive and negative anodes generate negative pressure drop i.e. Δ u < 0, at this time positive and negative anodes circuit
Capacitor is required to discharge, and capacitance current can flow to grounding point by route；Similarly, when cathode breaks down, such as dotted line institute in Fig. 2
Show, positive and negative anodes circuit capacitor is required to charge, and positive and negative anodes circuit capacitance current can flow to route by grounding point.Above-mentioned analytical table
Bright, positive and negative anodes capacitance current is consistent relative to the direction of grounding point inflow and outflow, does not offset each other.
System fault-free circuit when due to ground fault, grounding 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 is that bus is directed toward route, for fault point f1, it can be obtained according to Kirchhoff's current law (KCL):
In formula, ifTo flow to current in the fault point, i from routeC1i、iCkiRespectively fault feeder and non-faulting feeder line is electric over the ground
Capacitance current.Defining non-faulting feeder line positive and negative electrode jump-value of current is respectively Δ ipk、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 them here.As it can be seen that fault feeder is positive and negative when monopole failure occurs for feeder line
Pole head end electric current Sudden Changing Rate is contrary, and failure polar curve head end electric current Sudden Changing Rate is 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 is approximately equal, and waveform is approximately to be positively correlated, and 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 are as follows:
1) feeder line section internal fault.By taking feeder line 1 in Fig. 1 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.To be still directed toward route with bus and being positive convenient for analysis
Direction.According to principle of stacking, B1C1When positive electrode fault, it is equivalent in fault point plus a negative voltage source Δ uf1, 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 route
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 to be positively correlated.
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 route two sides is approximately to be positively correlated；And the outer event of feeder line section
When barrier, the jump-value of current waveform of route two sides is approximately negatively correlated.
In above-mentioned steps, knowledge of the system two sides identification device installation place for fault feeder, failure pole and fault section
Other process are as follows:
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 greater than threshold value kWHWhen, it is judged to positive electrode fault；Work as ρlGreater than threshold value klWhen, determine feeder line
Section is fault section, is less than threshold value klWhen, determine that feeder line section is non-faulting section.
Flexible direct current power system simulation model is constructed using PSCAD, simulating, verifying is carried out to mentioned method:
1) model is established
In order to make Future Power System develop into the advanced system of an alternating current-direct current mixed connection, the medium-voltage distribution of DC distribution
Backbone network will be based on ± 10kV network, and low-pressure section will be with the appliance load of the industrial load of ± 750V of user side and 400V
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 is set in a model, to test the performance of proposed method.This paper sample frequency
For 25kHz, data window 2ms, system parameter is as shown in table 1, and line parameter circuit value is as shown in table 2.
1 system parameter table of table
| System parameter title | Numerical value |
| AC supply voltage/kV | 110 |
| Ac rated voltage/kV | 10 |
| Converter station rated capacity/MVA | 5 |
| Photovoltaic rated capacity/MVA | 0.25 |
| Energy storage device/MW | 0.25 |
| Inverter level number | 11 |
| Submodule capacitor/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 ground fault, STCFB waveform 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 approximation be positively correlated, and feeder line F1The STCFB waveform approximation of positive and negative anodes head end electric current Sudden Changing Rate is 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
Ground fault.
To feeder line 1A1B1And B1C1The STCFB of two 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 two sides detect is negatively correlated, B1C1Two sides detect
The waveform approximation of STCFB be positively correlated, by ρ in table 4lData may determine that B1C1Ground 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 emulating data in table 6 it can be concluded that in different transition resistances, system two 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 to carry out 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
Two sides STCFB waveform, obtains 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, taking transition resistance is 20 Ω,
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) side failure is exchanged.In ac bus f4Place's setting different type short trouble, simulation result are as shown in table 8.
Table 8 exchanges side fault simulation
From the data in table 8, it can be seen that the various fault types occurred in exchange side can be all determined as the outer failure of feeder line, be differentiated
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 (4)
1. flexible direct current power distribution network monopole failure line selection and Section Location, which comprises the following steps:
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
The jump-value of current signal in the set period of time of failure front and back is extracted respectively, and S change is 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,
Influence of the low frequency part of signal vulnerable to load current, high frequency section is again easily due to amplitude-frequency characteristic reaches resonance peak by line
Road decaying, therefore, in order to improve the sensitivity of recognition methods, needs the characteristic frequency section of clear jump-value of current；
According to multiple time-frequency s-matrix, the S-transformation characteristic spectra STCFB and S-transformation characteristic spectra of calculating current Sudden Changing Rate signal
S-transformation energy in STCFB；
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 positive and negative electrode jump-value of current S-transformation characteristic spectra STCFB transient state energy and,
Carry out the judgement of failure pole；
According to the fault section of S-transformation characteristic spectra STCFB and Pearson correlation coefficient identification fault feeder, to complete section
Positioning；
The S-transformation characteristic spectra STCFB of the calculating current Sudden Changing Rate, specifically:
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-frequency characteristic of q；P is row vector, indicates signal time domain specification at a certain frequency p；fmax、fminIt 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 STCFB waveform；S [q] is an ordered series of numbers, is indicated corresponding to q-th of sampled point
S-transformation characteristic spectra STCFB；
S-transformation energy in the characteristic spectra of the calculating current Sudden Changing Rate signal, specifically:
It is S [p, q], transient state energy that input signal, which is defined, in S-transformation element value of the particular moment q at specific frequency p are as follows:
E (p, q)=abs (S [p, q])
Based on sampled value principle, sums to the transient state energy of all sampled points in S-transformation characteristic spectra STCFB, obtain signal in S
S-transformation transient state energy and W under transform characteristics frequency range STCFB:
fmax、fminIt is taken as characteristic spectra upper and lower limit frequency value respectively, N represents the sum of sampled point in data window；
Pearson correlation coefficient specifically:
Wherein, S1(q), S2(q) be respectively feeder line positive and negative anodes line current Sudden Changing Rate signal S-transformation characteristic spectra STCFB；
The fault feeder identification for establishing DC distribution net according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to, specifically:
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；
Conversely, if: ρfi>kf, then it is non-faulting feeder line；
Wherein, kfFor setting valve；
It is described relatively positive and negative electrode jump-value of current characteristic frequency section transient state energy and, carry out failure pole judgement, specifically:
Calculate positive and negative electrode route 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, determine that feeder line anode breaks down；
Work as λi<1-kWLWhen, determine that feeder line cathode breaks down；
Wherein, kWL、kWHRespectively indicate safety factor；
The fault section according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient identification fault feeder, specifically:
Define ρlFor the Pearson correlation coefficient of S-transformation characteristic spectra STCFB 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.
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 4000Hz and 500Hz.
3. flexible direct current power distribution network monopole failure line selection and section positioning system characterized by comprising 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 performs the steps of when executing described program
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
The jump-value of current signal in the set period of time of failure front and back is extracted respectively, and S change is 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；
Sentenced according to the fault feeder section identification that S-transformation characteristic spectra STCFB and Pearson correlation coefficient establish DC distribution net
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 according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient identification fault feeder, to complete
Fault section location；
The S-transformation characteristic spectra STCFB of the calculating current Sudden Changing Rate, specifically:
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-frequency characteristic of q；P is row vector, indicates signal time domain specification at a certain frequency p；fmax、fminIt 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 STCFB waveform；S [q] is an ordered series of numbers, is indicated corresponding to q-th of sampled point
S-transformation characteristic spectra STCFB；
S-transformation energy in the characteristic spectra of the calculating current Sudden Changing Rate signal, specifically:
It is S [p, q], transient state energy that input signal, which is defined, in S-transformation element value of the particular moment q at specific frequency p are as follows:
E (p, q)=abs (S [p, q])
Based on sampled value principle, sums to the transient state energy of all sampled points in S-transformation characteristic spectra STCFB, obtain signal in S
S-transformation transient state energy and W under transform characteristics frequency range STCFB:
fmax、fminIt is taken as characteristic spectra upper and lower limit frequency value respectively, N represents the sum of sampled point in data window；
Pearson correlation coefficient specifically:
Wherein, S1(q), S2(q) be respectively feeder line positive and negative anodes line current Sudden Changing Rate signal S-transformation characteristic spectra STCFB；
The fault feeder identification for establishing DC distribution net according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to, specifically:
Assuming that description feeder line positive and negative anodes line current Sudden Changing Rate similarity degree Pearson correlation coefficient be ρ fi, i=1,2,3,4,
It is as follows then to construct fault feeder selecting criterion:
Work as satisfaction: ρfi<kfWhen, this feeder line is fault feeder；
Conversely, if: ρfi>kf, then it is non-faulting feeder line；
Wherein, kfFor setting valve；
It is described relatively positive and negative electrode jump-value of current characteristic frequency section transient state energy and, carry out failure pole judgement, specifically:
Calculate positive and negative electrode route 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, determine that feeder line anode breaks down；
Work as λi<1-kWLWhen, determine that feeder line cathode breaks down；
Wherein, kWL、kWHRespectively indicate safety factor；
The fault section using according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient identification fault feeder, tool
Body are as follows:
Define ρlFor the Pearson correlation coefficient of S-transformation characteristic spectra STCFB 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.
4. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
Following steps are executed when row:
Each section electric current of DC power distribution line is acquired, collected current data is filtered；
The jump-value of current signal in the set period of time of failure front and back is extracted respectively, and S change is 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；
Sentenced according to the fault feeder section identification that S-transformation characteristic spectra STCFB and Pearson correlation coefficient establish DC distribution net
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 according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient identification fault feeder, to complete
Section positioning；
The S-transformation characteristic spectra STCFB of the calculating current Sudden Changing Rate, specifically:
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-frequency characteristic of q；P is row vector, indicates signal time domain specification at a certain frequency p；fmax、fminIt 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 STCFB waveform；S [q] is an ordered series of numbers, is indicated corresponding to q-th of sampled point
S-transformation characteristic spectra STCFB；
S-transformation energy in the characteristic spectra of the calculating current Sudden Changing Rate signal, specifically:
It is S [p, q], transient state energy that input signal, which is defined, in S-transformation element value of the particular moment q at specific frequency p are as follows:
E (p, q)=abs (S [p, q])
Based on sampled value principle, sums to the transient state energy of all sampled points in S-transformation characteristic spectra STCFB, obtain signal in S
S-transformation transient state energy and W under transform characteristics frequency range STCFB:
fmax、fminIt is taken as characteristic spectra upper and lower limit frequency value respectively, N represents the sum of sampled point in data window；
Pearson correlation coefficient specifically:
Wherein, S1(q), S2(q) be respectively feeder line positive and negative anodes line current Sudden Changing Rate signal S-transformation characteristic spectra STCFB；
The fault feeder identification for establishing DC distribution net according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient is sentenced
According to, specifically:
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；
Conversely, if: ρfi>kf, then it is non-faulting feeder line；
Wherein, kfFor setting valve；
It is described relatively positive and negative electrode jump-value of current characteristic frequency section transient state energy and, carry out failure pole judgement, specifically:
Calculate positive and negative electrode route 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, determine that feeder line anode breaks down；
Work as λi<1-kWLWhen, determine that feeder line cathode breaks down；
Wherein, kWL、kWHRespectively indicate safety factor；
The fault section using according to S-transformation characteristic spectra STCFB and Pearson correlation coefficient identification fault feeder, tool
Body are as follows:
Define ρlFor the Pearson correlation coefficient of S-transformation characteristic spectra STCFB 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.
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