CN106370960B - Mine power grid electric leakage identification method based on fault instantaneous positive sequence current real part component - Google Patents
Mine power grid electric leakage identification method based on fault instantaneous positive sequence current real part component Download PDFInfo
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- CN106370960B CN106370960B CN201610668149.6A CN201610668149A CN106370960B CN 106370960 B CN106370960 B CN 106370960B CN 201610668149 A CN201610668149 A CN 201610668149A CN 106370960 B CN106370960 B CN 106370960B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a mine power grid current leakage identification method based on the fault instantaneous positive sequence current real part component. The mine power grid current leakage identification method comprises the steps that 1, an current leakage signal is obtained, stored and uploaded synchronously; 2, the current leakage signal is received, analyzed and processed; 3, whether power grid current leakage exists or not is judged; 4, whether power grid trunk line current leakage exists or not is judged; 5, power grid trunk line current leakage protecting and power grid trunk line current leakage result outputting are conducted; and 6, power grid current leakage branch line identification, result outputting and power grid branch line current leakage protecting are conducted. According to the mine power grid current leakage identification method based on the fault instantaneous positive sequence current real part component, the design is novel; trunk line or branch line current leakage faults are judged by adopting the phasor and the module value of a zero sequence current; the problem that trunk line and branch line faults cannot be distinguished through traditional leakage selecting methods is solved; power grid current leakage branch lines are identified through the amplitude magnitude of the real part of a branch line current leakage fault instantaneous positive sequence current; the line selection effect is obvious; and the line selection method is high in adaptability.
Description
Technical field
The invention belongs to mine low-voltage electricity grid electric leakage protection technology field, and in particular to one kind is based on the instantaneous positive sequence electricity of failure
Flow the power system in mines electric leakage discrimination method of real component.
Background technology
At present, leak current fault is accounted for as one of mine low-voltage electricity grid (380V, 660V, 1140V) most common leak current fault
70% or so of its total leak current fault.Electric leakage can produce electric spark, if can not process in time, gas and coal dust will be caused quick-fried
It is fried, immeasurable consequence is caused to the person and production safety.《Safety regulations in coal mine》Regulation：" should be on mine low pressure feeder line
Leak detection protection device with earth leakage search/lockout is installed, when generation electric leakage or the reduction of system insulation level is shown on leakage detection apparatus,
Must cut off the electricity supply immediately, can power transmission after the completion for the treatment of ".
Under special coal production environment, once leaking electricity, the branch road of electric leakage must be accurately picked out, and move rapidly
Make in tripping operation, accurately fault branch is cut off from system, it is ensured that the normal power supply of non-faulting part；Otherwise, it is possible to
The important power supply unit power failure in underground is caused, Safety of Coal Mine Production is influenceed.There are the selection method different from medium voltage network, mine electric
Net has the requirement of " limiting safe electric current " and operation time limit 30ms, and electric leakage need to be acted in tripping operation immediately.So, mine low tension
The electric leakage branch road identification protecting method of net must be simple, and data window is short, reliable in action.Traditional earth leakage protecting method is mostly based on
Zero sequence current signal carries out earth leakage protective, at the electric power incoming line of mine low-voltage electricity grid generally equipped with DC detecting type total leak detection after
Electrical equipment, it contains zero-sequence reactor, and due to the compensating action of zero-sequence reactor, power system in mines is likely to be at compensating coefficient, and this makes
Obtain the zero-sequence current directional power protection failure uniquely with choosing leakage function.Other existing earth leakage protecting method presence can not have
The identification main failure and the defect of fault of branch line of effect, once fault of branch line is mistaken for main failure, can undoubtedly expand power failure
Scope.
The content of the invention
The technical problems to be solved by the invention are for above-mentioned deficiency of the prior art, there is provided one kind is based on failure
The power system in mines electric leakage discrimination method of instantaneous forward-order current real component, it is novel in design rationally, using the phasor of zero-sequence current
The modulus value of sum judges main line or branch line leak current fault, and overcoming traditional leakage selecting method can not distinguish asking for main line and fault of branch line
Topic, grid power leakage branch line is recognized by the amplitude size of the real part of the instantaneous forward-order current of branch line leak current fault, and route selection effect is obvious,
And selection method adaptivity is strong.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Based on the instantaneous forward-order current real part of failure point
The power system in mines electric leakage discrimination method of amount, it is characterised in that the method is comprised the following steps：
Step one, the acquisition of electric leakage signal, storage and synchronized upload：Using main line intelligent terminal for main line three-phase electricity
Stream, line voltage and residual voltage parameter are acquired and carry out main line trip protection, using branch line intelligent terminal for branch line
Three-phase current is acquired and carries out branch line trip protection, and main line intelligent terminal and branch line intelligent terminal pass through ethernet communication
Module is communicated with master control protection module, the data storage that master control protection module will be obtained in the data storage and it is synchronous on
Reach host computer；
The main line intelligent terminal includes trunk controller and the main line ethernet communication module connected with trunk controller,
The input of trunk controller is terminated with main line analog-digital converter, and the input of main line analog-digital converter is terminated with main line three-phase current and adopts
Collection processing module, line voltage acquisition processing module and residual voltage acquisition processing module, the output of trunk controller are terminated with
Main line tripping operation performing module, the main line three-phase current acquisition processing module includes main line three-phase current progress of disease circuit and and main line
The main line three-phase current wave filter of three-phase current progress of disease circuit output end connection, the line voltage acquisition processing module includes electricity
Net voltage progress of disease circuit and the line voltage wave filter being connected with line voltage progress of disease circuit output end, the residual voltage collection
Processing module includes residual voltage progress of disease circuit and the residual voltage wave filter being connected with residual voltage progress of disease circuit output end；
The branch line intelligent terminal includes branch controller and the branch line ethernet communication module connected with branch controller,
The input of branch controller is terminated with branch line three-phase current acquisition processing module, and the output of branch controller is terminated with branch line tripping operation
Performing module, the branch line three-phase current acquisition processing module includes the branch line three-phase current progress of disease circuit, the branch line that are sequentially connected
Three-phase current wave filter and branch line analog-digital converter；
The quantity of the branch line intelligent terminal is multiple；
Step 2, the reception of electric leakage signal and analyzing and processing：Main line analog-digital converter is right under the control of trunk controller
Main line three-phase current, line voltage and residual voltage signal after after filtering carry out periodic sampling, and to each sampling period
Interior gathered signal is exported to trunk controller after carrying out analog-to-digital conversion, the main line three-phase electricity that trunk controller is received to it
Stream, line voltage and residual voltage signal protect mould after being analyzed treatment by main line ethernet communication module transfer to master control
Block；Branch line analog-digital converter enters line period under the control of branch controller to the branch line three-phase current signal after after filtering
Sampling, and export to branch controller, branch controller after signal to being gathered in each sampling period carries out analog-to-digital conversion
The branch line three-phase current received to it protects mould after being analyzed treatment by branch line ethernet communication module transfer to master control
Block；
Step 3, grid power leakage whether judgement, process are as follows：
Step 301, according to formulaCalculate leak resistance Rg, wherein, ω is angular frequency, CΣIt is electricity
The total direct-to-ground capacitance of net, L is that zero-sequence reactor compensates inductance, ULIt is master control protection module at the line voltage analysis that receives
The line voltage virtual value that reason is obtained, U0For the zero sequence electricity that master control protection module is obtained to the residual voltage analyzing and processing for receiving
It is pressed with valid value；
Step 302, judge whether power network leaks electricity：First, repeat step 301, calculate the multiple in continuous a cycle
Leak resistance value Rg, then, master control protection module is by the multiple leak resistance value R in a cyclegElectric leakage with setting acts electricity
Resistance RdzIt is compared, as the multiple leak resistance value R in continuous a cyclegRespectively less than electric leakage action resistance value RdzWhen, sentence
Break as grid power leakage occurs, perform step 4；Otherwise, it is judged as grid power leakage, return to step two；
The judgement whether step 4, power network main line leak electricity, detailed process is as follows：
Step 401, according to ik0=ika+ikb+ikc, the instantaneous zero sequence current of main line and branch line is calculated, wherein, k=0,1,
2 ... ..., M, M are branch line number, and M >=2 and M are positive integer, as k=0, i00=i0a+i0b+i0cIt is main line instantaneous zero sequence electricity
Stream, i0a、i0bAnd i0cRespectively each phase current values in the main line of main line intelligent terminal acquisition process；When k is 1~M, ik0For each
The zero-sequence current of branch line, ika、ikbAnd ikcEach phase current in each branch line of the branch line intelligent terminal acquisition process of respectively each branch line
Value；
Step 402, the zero-sequence current phasor for calculating main line and branch lineMaster control protection module uses least square pencil of matrix
Algorithm calculates the virtual value I of zero-sequence current under main line and branch line power frequencyk0With phase αk0, obtain the zero-sequence current of main line and branch line
Phasor
Step 403, according to formulaCalculate the modulus value ∑ I of the phasor sum of zero-sequence currentk0；
Step 404, judge whether power network main line leaks electricity：Master control protection module is by ∑ I in step 403k0Value, judgement is
The electric leakage of power network main line or the electric leakage of power network branch line, as ∑ Ik0When ≠ 0, it is judged as that power network main line leaks electricity, performs step 5；When
∑Ik0When=0, it is judged as that power network branch line leaks electricity, performs step 6；
The electric leakage result output of step 5, power network main line earth leakage protective and power network main line：Master control protection module by main line with
To trunk controller, trunk controller controls main line tripping operation performing module trip operation to too Network Communication module transfer trip signal,
Excision power network main line leak current fault；Meanwhile, master control protection module is by liquid crystal touch screen display output power network main line electric leakage result
While to host computer transmission power network main line electric leakage result；
Step 6, the identification of grid power leakage branch line, result output and power network branch line earth leakage protective：Master control protection module is obtained
The data of branch line intelligent terminal transmission, are respectively processed to branch line three-phase leak current fault electric current in M branch line in step 401,
The processing method all same of the branch line three-phase leak current fault electric current in each branch line；To the branch line three-phase leak current fault in any branch line
When electric current is processed, detailed process is as follows：
Step 601, calculating branch line three-phase additivity electric current and additivity current variable：First, master control protection module
According to formulaCalculate branch line three-phase additivity electric current Δ ika(n)、Δikb(n) and Δ ikc
(n), wherein, ika(n)、ikb(n) and ikcN () is that the kth bar branch line of branch controller sampling leaks electricity and respectively adopt in latter cycle T
The three-phase current at sample moment, ika(n-N)、ikbAnd i (n-N)kc(n-N) it is the kth bar branch line leak current fault of branch controller sampling
The three-phase current of each sampling instant in previous cycle T,N is on a cycle T
Sampling number and N are positive integer；Then, by branch line three-phase additivity electric current Δ ika(n)、Δikb(n) and Δ ikcN () constitutes
Additivity current variable Δ Ik, Δ Ik=[Δ ika(n),Δikb(n),Δikc(n)]T；
Step 602, the calculating instantaneous forward-order current of leak current faultReal partAccording to formulaObtain the instantaneous forward-order current of leak current fault
Instantaneous forward-order current is obtained againReal partWherein, s120And s240
It is phase shift factor, s120=ej120°=cos120 °+jsin120 °, s240=ej240°=cos240 °+jsin240 °；
Step 603, the acquisition instantaneous forward-order current of leak current faultReal partAmplitudeMaster control is protected
Shield module is using least square matrix pencil algorithm to the instantaneous forward-order current of leak current fault in step 602Real partCarry out power frequency component amplitudeExtraction；
Step 604, M repeat step 601, until completing the instantaneous forward-order current of leak current fault on each branch line's
Real partPower frequency component amplitudeThe calculating process of extraction；
The identification of step 605, grid power leakage branch line：Master control protection module on each branch line in comparison step 604 by leaking
The instantaneous forward-order current of electric faultReal partPower frequency component amplitudeSize, selects amplitude maximum
Branch line, then this branch line be leak current fault branch line；
Step 606, grid power leakage branch line result synchronism output：Master control protection module is according to the result obtained in step 605
To host computer transmission power network branch line electric leakage result and by liquid crystal touch screen synchronism output；
Step 607, grid power leakage branch line earth leakage protective：Master control protection module controls the instantaneous forward-order current of leak current faultReal partPower frequency component amplitudeBranch line intelligent terminal action in maximum branch line, and pass through
Branch line ethernet communication module remote command branch controller control branch line tripping operation performing module in the branch line intelligent terminal is jumped
Lock is acted, and cuts off power network branch line leak current fault.
The above-mentioned electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure, it is characterised in that：
Master control protection module calculates the effective of zero-sequence current under main line and branch line power frequency by least square matrix pencil algorithm in step 402
Value Ik0With phase αk0, and in step 603 master control protection module by least square matrix pencil algorithm calculate leak current fault it is instantaneous
Forward-order currentReal partAmplitudeWhen, detailed process is as follows：
Step I, the effective pencil of matrix Y of structure2-λY1, wherein,
Y (n) be signal observation andL is beam parameter, and L is
Positive integer andF (n) is noise signal,For in actually active signal P have any amplitude,
The linear combination of the exponential function of phase, frequency and decay factor, RiIt is i-th multiple amplitude of signal, DiIt is i-th letter
Number the signal attenuation factor, ωiIt is i-th angular frequency of signal, P is signal exponent number,
Step II, solution zi：First, according to pencil of matrix principle, ziIt is active matrix beam Y2-λY1Generalized eigenvalue；So
Afterwards, to formula Y2bi=ziY1biIt is multiplied by Y simultaneously in both sides1 +, obtain (Y1 +Y2-ziI)bi=0, wherein, biIt is ziGeneralized character to
Amount, Y1 +It is Y1Pseudo inverse matrix；Finally, Y is solved by master control protection module1 +Y2Characteristic root obtain zi；
Step III, according to least square solution matrix equationWherein p' is
ziThe number of middle nonzero eigenvalue, tries to achieveAiIt is i-th signal amplitude of signal；
Step IV, determine the instantaneous forward-order current of each branch roadReal partMiddle 50Hz power frequency components amplitude
The above-mentioned electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure, it is characterised in that：
In step 402 under main line and branch line power frequency zero-sequence current virtual value Ik0With phase αk0Tried to achieve using step I~step IV, walked
Y (n) in rapid I is main line and the instantaneous zero sequence current i of branch linek0Observation, try to achieve
Master control protection module is by the corresponding amplitude A of power frequency component that step IV finds out 50HziAnd phase thetai, obtain main line and branch line work
The virtual value I of the lower zero-sequence current of frequencyk0With phase αk0。
The above-mentioned electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure, it is characterised in that：
The instantaneous forward-order current of leak current fault in step 603Real partAmplitudeUsing step I~step IV
Try to achieve, the y (n) in step I is the instantaneous forward-order current of leak current faultReal partAmplitudeObservation
Value, tries to achieveMaster control protection module finds out the corresponding amplitude A of power frequency component that step IV finds out 50Hzi, obtain
To the instantaneous forward-order current of leak current faultReal partAmplitude
The above-mentioned electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure, it is characterised in that：
Main line three-phase current wave filter, line voltage wave filter, residual voltage wave filter and branch line three-phase current wave filter in step one
It is RC low pass filters.
The present invention has advantages below compared with prior art：
1st, method of the present invention step is simple, reasonable in design, realizes that convenient and input cost is low, easy to operate.
2nd, the present invention judges main line or branch line leak current fault, i.e. difference current by the modulus value of the phasor sum of zero-sequence current
Method distinguishes main line leak current fault and branch line leak current fault, and overcoming traditional leakage selecting method can not distinguish main line and fault of branch line
Problem, improves the reliability of electric leakage identification.
3rd, the real-time acquisition and treatment that the present invention passes through data, to leak current fault energy fast reaction so that protection has very
Quick-action well, can fully meet professional standard, protect comprehensive and no operating dead zone, do not receive leak current fault type, electric leakage event
Downtime and the influence in leak current fault place, the reliability of protection are high.
4th, the present invention differentiates electric leakage branch road by the amplitude size of the real part of the instantaneous forward-order current of branch line leak current fault, therefore
Barrier branch road feature is with non-faulting branch road feature difference substantially, higher compared to traditional leakage selecting method reliability, and selection method is certainly
Strong adaptability.
5th, the present invention extracts failure power frequency characteristic quantity using least square matrix pencil algorithm from transient process signal, does not receive
System frequency change influence, it is more accurate than traditional FFT method.
6th, the present invention is using intelligent terminal composition electric leakage identification system, and intelligence degree is high.
7th, the present invention is novel in design rationally, small volume, timely transmission fault indication signal, and trip fast response time, practical
Property it is strong, be easy to promote the use of.
In sum, the present invention is novel in design rationally, and the modulus value using the phasor sum of zero-sequence current judges main line or branch line
Leak current fault, overcoming traditional leakage selecting method can not distinguish the problem of main line and fault of branch line, instantaneous by branch line leak current fault
The amplitude size identification grid power leakage branch line of the real part of forward-order current, route selection effect is obvious, and selection method adaptivity is strong, just
In promoting the use of.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of the power system in mines electric leakage identification apparatus that the present invention is used.
Fig. 2 is the circuit theory diagrams of main line intelligent terminal of the present invention.
Fig. 3 is the circuit theory diagrams of branch line intelligent terminal of the present invention.
Fig. 4 is the method flow block diagram of power system in mines electric leakage discrimination method of the present invention.
Description of reference numerals:
1-main line intelligent terminal；1-1-main line three-phase current progress of disease circuit；
1-2-main line three-phase current wave filter；1-3-line voltage progress of disease circuit；
1-4-line voltage wave filter；1-5-residual voltage progress of disease circuit；
1-6-residual voltage wave filter；1-7-main line analog-digital converter；
1-8-trunk controller；1-9-main line ethernet communication module；
1-10-main line tripping operation performing module；2-branch line intelligent terminal；
2-1-branch line three-phase current progress of disease circuit；2-2-branch line three-phase current wave filter；
2-3-branch line analog-digital converter；2-4-branch controller；
2-5-branch line ethernet communication module；2-6-branch line tripping operation performing module；
3-master control protection module；4-failure indication module；5-data storage；
6-liquid crystal touch screen；7-serial communication circuit module；8-host computer.
Specific embodiment
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, power system in mines of the present invention based on the instantaneous forward-order current real component of failure leaks
Electric discrimination method, comprises the following steps：
Step one, the acquisition of electric leakage signal, storage and synchronized upload：Using main line intelligent terminal 1 for main line three-phase electricity
Stream, line voltage and residual voltage parameter are acquired and carry out main line trip protection, using branch line intelligent terminal 2 for branch line
Three-phase current is acquired and carries out branch line trip protection, and main line intelligent terminal 1 and branch line intelligent terminal 2 pass through ether Netcom
Letter module communicated with master control protection module 3, master control protection module 3 will acquisition data storage in data storage 5 simultaneously
Synchronized upload is to host computer 8；
In actually used, the data storage that master control protection module 3 will be obtained is in data storage 5 and by serial communication
To host computer 8, the quantity of branch line intelligent terminal 2 is multiple, the output termination of master control protection module 3 to the synchronized upload of circuit module 7
Faulty indicating module 4, the failure indication module 4 includes multiple indicator lamps, and the indicator lamp is respectively used to indicate main line event
Barrier state and fault of branch line state, in the present embodiment, master control protection module 3 is industrial computer；
The main line intelligent terminal 1 includes trunk controller 1-8 and the main line ether Netcom connected with trunk controller 1-8
Letter module 1-9, the input of trunk controller 1-8 is terminated with main line analog-digital converter 1-7, the input of main line analog-digital converter 1-7
Main line three-phase current acquisition processing module, line voltage acquisition processing module and residual voltage acquisition processing module are terminated with, are done
The output of lane controller 1-8 is terminated with main line tripping operation performing module 1-10, and the main line three-phase current acquisition processing module includes
Main line three-phase current progress of disease circuit 1-1 and the main line three-phase current filter being connected with main line three-phase current progress of disease circuit 1-1 output ends
Ripple device 1-2, the line voltage acquisition processing module include line voltage progress of disease circuit 1-3 and with line voltage progress of disease circuit 1-
The line voltage wave filter 1-4 of 3 output ends connection, the residual voltage acquisition processing module includes residual voltage progress of disease circuit 1-
The 5 and residual voltage wave filter 1-6 that is connected with residual voltage progress of disease circuit 1-5 output ends；
The branch line intelligent terminal 2 includes branch controller 2-4 and the branch line ether Netcom connected with branch controller 2-4
Letter module 2-5, the input of branch controller 2-4 is terminated with branch line three-phase current acquisition processing module, and branch controller 2-4's is defeated
Go out to be terminated with branch line tripping operation performing module 2-6, the branch line three-phase current acquisition processing module includes the branch line three being sequentially connected
Phase current progress of disease circuit 2-1, branch line three-phase current wave filter 2-2 and branch line analog-digital converter 2-3；
In the present embodiment, trunk controller 1-8 and branch controller 2-4 is microcontroller, the main line three-phase current progress of disease
Circuit 1-1 gathers main line three-phase real-time current, and main line three-phase real-time current send by after main line three-phase current wave filter 1-2 denoisings
Enter main line analog-digital converter 1-7 and the current data that main line three-phase current progress of disease circuit 1-1 is gathered is transformed to trunk controller 1-8
Accessible data signal；Line voltage progress of disease circuit 1-3 gathers main line three-phase real-time voltage, and main line three-phase real-time voltage passes through
The voltage number that main line analog-digital converter 1-7 gathers line voltage progress of disease circuit 1-3 is sent into after line voltage wave filter 1-4 denoisings
According to being transformed to the accessible data signals of trunk controller 1-8；Residual voltage progress of disease circuit 1-5 collection main line three-phase zero sequence electricity
Pressure, main line three-phase residual voltage is by sending into main line analog-digital converter 1-7 by residual voltage after residual voltage wave filter 1-6 denoisings
The voltage data of progress of disease circuit 1-5 collections is transformed to the accessible data signals of trunk controller 1-8；The branch line three-phase current progress of disease
Circuit 2-1 gathers branch line three-phase real-time current, and branch line three-phase real-time current send by after branch line three-phase current wave filter 2-2 denoisings
Enter branch line analog-digital converter 2-3, the current data that branch line three-phase current progress of disease circuit 2-1 is gathered is transformed to branch controller 2-
4 accessible data signals；
Step 2, the reception of electric leakage signal and analyzing and processing：Controls of the main line analog-digital converter 1-7 in trunk controller 1-8
Under system, periodic sampling is carried out to the main line three-phase current after after filtering, line voltage and residual voltage signal, and adopt to each
The signal gathered in the sample cycle export after analog-to-digital conversion giving trunk controller 1-8, and trunk controller 1-8 is received to it
Main line three-phase current, line voltage and residual voltage signal be analyzed after treatment by main line ethernet communication module 1-9
Transmit to master control protection module 3；Branch line analog-digital converter 2-3 under the control of branch controller 2-4, to the branch after after filtering
Line three-phase current signal carries out periodic sampling, and signal to being gathered in each sampling period export after analog-to-digital conversion to
Branch controller 2-4, the branch line three-phase current that branch controller 2-4 is received to it passes through branch line ether after being analyzed treatment
Network Communication module 2-5 is transmitted to master control protection module 3；
Step 3, grid power leakage whether judgement, process are as follows：
Step 301, according to formulaCalculate leak resistance Rg, wherein, ω is angular frequency, CΣIt is electricity
The total direct-to-ground capacitance of net, L is that zero-sequence reactor compensates inductance, ULIt is the 3 pairs of line voltage analyses for receiving of master control protection module
The line voltage virtual value that treatment is obtained, U0For 3 pairs of residual voltages for receiving of master control protection module analyze and process obtain zero
Sequence voltage virtual value；
Step 302, judge whether power network leaks electricity：First, repeat step 301, calculate the multiple in continuous a cycle
Leak resistance value Rg, then, master control protection module 3 is by the multiple leak resistance value R in a cyclegElectric leakage with setting is acted
Resistance value RdzIt is compared, as the multiple leak resistance value R in continuous a cyclegRespectively less than electric leakage action resistance value RdzWhen,
It is judged as that grid power leakage occurs, performs step 4；Otherwise, it is judged as grid power leakage, return to step two；
In the present embodiment, action resistance value of leaking electricity RdzAccording to MT871-2011《Mine anti-explosion low-voltage alternating-current vacuum feed is opened
Close》Regulation 1140V mine low-voltage electricity grids electric leakage action resistance value RdzValue is the leakage of 20k Ω, 660V mine low-voltage electricity grids
It is electronic to make resistance value RdzValue is the electric leakage action resistance value R of 11k Ω, 380V mine low-voltage electricity gridsdzValue is 3.5k Ω；
The judgement whether step 4, power network main line leak electricity, detailed process is as follows：
Step 401, according to ik0=ika+ikb+ikc, the instantaneous zero sequence current of main line and branch line is calculated, wherein, k=0,1,
2 ... ..., M, M are branch line number, and M >=2 and M are positive integer, as k=0, i00=i0a+i0b+i0cIt is main line instantaneous zero sequence electricity
Stream, i0a、i0bAnd i0cRespectively each phase current values in the main line of the acquisition process of main line intelligent terminal 1；When k is 1~M, ik0For each
The zero-sequence current of branch line, ika、ikbAnd ikcEach mutually electricity in each branch line of the acquisition process of branch line intelligent terminal 2 of respectively each branch line
Flow valuve；
The quantity of the branch line intelligent terminal 2 is multiple, and in the present embodiment, the quantity of branch line intelligent terminal 2 is M；
Step 402, the zero-sequence current phasor for calculating main line and branch lineMaster control protection module 3 uses least square matrix
Beam algorithm calculates the virtual value I of zero-sequence current under main line and branch line power frequencyk0With phase αk0, obtain the zero sequence electricity of main line and branch line
Stream phasor
Step 403, according to formulaCalculate the modulus value ∑ I of the phasor sum of zero-sequence currentk0；
Step 404, judge whether power network main line leaks electricity：Master control protection module 3 is by ∑ I in step 403k0Value, judge
It is the electric leakage of power network main line or the electric leakage of power network branch line, as ∑ Ik0When ≠ 0, it is judged as that power network main line leaks electricity, performs step 5；
As ∑ Ik0When=0, it is judged as that power network branch line leaks electricity, performs step 6；
The electric leakage result output of step 5, power network main line earth leakage protective and power network main line：Master control protection module 3 by main line with
Too Network Communication module 1-9 transmission trip signals give trunk controller 1-8, trunk controller 1-8 control main line tripping operation performing modules
1-10 trip operations, cut off power network main line leak current fault；Meanwhile, master control protection module 3 is by the display output of liquid crystal touch screen 6 electricity
To the transmission power network main line electric leakage result of host computer 8 while net main line electric leakage result；
Step 6, the identification of grid power leakage branch line, result output and power network branch line earth leakage protective：Master control protection module 3 is obtained
The data of the transmission of branch line intelligent terminal 2 are taken, branch line three-phase leak current fault electric current in M branch line in step 401 is located respectively
Reason, the processing method all same of the branch line three-phase leak current fault electric current in each branch line；To the branch line three-phase electric leakage in any branch line
When fault current is processed, detailed process is as follows：
Step 601, calculating branch line three-phase additivity electric current and additivity current variable：First, master control protection module 3
According to formulaCalculate branch line three-phase additivity electric current Δ ika(n)、Δikb(n) and Δ
ikc(n), wherein, ika(n)、ikb(n) and ikcN () is that the kth bar branch line of branch controller 2-4 samplings leaks electricity in latter cycle T
The three-phase current of each sampling instant, ika(n-N)、ikbAnd i (n-N)kc(n-N) it is the kth bar branch line of branch controller 2-4 samplings
The three-phase current of each sampling instant in the previous cycle T of leak current fault,N is a week
Sampling number and N on phase T are positive integer；Then, by branch line three-phase additivity electric current Δ ika(n)、Δikb(n) and Δ ikc
(n) composition additivity current variable Δ Ik, Δ Ik=[Δ ika(n),Δikb(n),Δikc(n)]T；
Step 602, the calculating instantaneous forward-order current of leak current faultReal partAccording to formulaObtain the instantaneous forward-order current of leak current fault
Instantaneous forward-order current is obtained againReal partWherein, s120And s240
It is phase shift factor, s120=ej120°=cos120 °+jsin120 °, s240=ej240°=cos240 °+jsin240 °；
Step 603, the acquisition instantaneous forward-order current of leak current faultReal partAmplitudeMaster control
Protection module 3 is using least square matrix pencil algorithm to the instantaneous forward-order current of leak current fault in step 602Real partCarry out power frequency component amplitudeExtraction；
Step 604, M repeat step 601, until completing the instantaneous forward-order current of leak current fault on each branch line's
Real partPower frequency component amplitudeThe calculating process of extraction；
The identification of step 605, grid power leakage branch line：Master control protection module 3 on each branch line in comparison step 604 by leaking
The instantaneous forward-order current of electric faultReal partPower frequency component amplitudeSize, selects amplitude maximum
Branch line, then this branch line be leak current fault branch line；
Step 606, grid power leakage branch line result synchronism output：Master control protection module 3 is according to the result obtained in step 605
To the transmission power network branch line electric leakage result of host computer 8 and by the synchronism output of liquid crystal touch screen 6；
Step 607, grid power leakage branch line earth leakage protective：Master control protection module 3 controls the instantaneous forward-order current of leak current faultReal partPower frequency component amplitudeBranch line intelligent terminal 2 in maximum branch line is acted, and is passed through
Branch line ethernet communication module 2-5 remote command branch controllers 2-4 control branch line tripping operations in the branch line intelligent terminal 2 are performed
Module 2-6 trip operations, cut off power network branch line leak current fault.
In the present embodiment, master control protection module 3 calculates main line and branch line by least square matrix pencil algorithm in step 402
The virtual value I of zero-sequence current under power frequencyk0With phase αk0, and in step 603 master control protection module 3 pass through least square matrix
Beam algorithm calculates the instantaneous forward-order current of leak current faultReal partAmplitudeWhen, detailed process is as follows：
Step I, the effective pencil of matrix Y of structure2-λY1, wherein,
Y (n) be signal observation andL is beam parameter, and L is
Positive integer andF (n) is noise signal,For in actually active signal P have any amplitude,
The linear combination of the exponential function of phase, frequency and decay factor, RiIt is i-th multiple amplitude of signal, DiIt is i-th letter
Number the signal attenuation factor, ωiIt is i-th angular frequency of signal, P is signal exponent number,
Step II, solution zi：First, according to pencil of matrix principle, ziIt is active matrix beam Y2-λY1Generalized eigenvalue；So
Afterwards, to formula Y2bi=ziY1biIt is multiplied by Y simultaneously in both sides1 +, obtain (Y1 +Y2-ziI)bi=0, wherein, biIt is ziGeneralized character to
Amount, Y1 +It is Y1Pseudo inverse matrix；Finally, Y is solved by master control protection module 31 +Y2Characteristic root obtain zi；
Step III, according to least square solution matrix equationWherein p' is
ziThe number of middle nonzero eigenvalue, tries to achieveAiIt is i-th signal amplitude of signal；
Step IV, determine the instantaneous forward-order current of each branch roadReal partMiddle 50Hz power frequency components amplitude
In the present embodiment, in step 402 under main line and branch line power frequency zero-sequence current virtual value Ik0With phase αk0Using step
Rapid I~step IV is tried to achieve, and the y (n) in step I is the instantaneous zero sequence current i of main line and branch linek0Observation, try to achieveMaster control protection module 3 is by the corresponding amplitude A of power frequency component that step IV finds out 50Hzi
And phase thetai, obtain the virtual value I of zero-sequence current under main line and branch line power frequencyk0With phase αk0。
In the present embodiment, the instantaneous forward-order current of leak current fault in step 603Real partAmplitudeTried to achieve using step I~step IV, the y (n) in step I is the instantaneous forward-order current of leak current faultReal partAmplitudeObservation, try to achieveMaster control protection module 3 is found out step IV and is found out
The corresponding amplitude A of power frequency component of 50Hzi, obtain the instantaneous forward-order current of leak current faultReal partWidth
Value
In the present embodiment, main line three-phase current wave filter 1-2, line voltage wave filter 1-4, residual voltage filter in step one
Ripple device 1-6 and branch line three-phase current wave filter 2-2 are RC low pass filters.
Embodiment 1
When the present invention is used, for the electric power system of 380V, it is 8, C to use branch line quantity nΣ=2.48 μ F, system
During overcompensation 10%, the electric power system of L=1.238H calculates leak resistance value RgDuring=100 Ω, leak resistance value RgIt is less than
The electric leakage action resistance value R of 3.5k Ωdz, the power network generation leak current fault of 380V；8 branch line intelligent terminals are used in the present embodiment
2 gather 8 branch line currents of branch line respectively, using the rail current progress of disease circuit 1-1 collection main line electricity in main line intelligent terminal 1
Stream i0a、i0bAnd i0c, as k=0, master control protection module 3 calculates power network main line zero-sequence current ik0=ika+ikb+ikc, when k ≠ 0
When, gather each branch line current i using 8 branch line intelligent terminals 2ka、ikbAnd ikc, k=1,2 ..., 8, master control protection module 3 is counted
Calculate branch line zero-sequence current ik0=ika+ikb+ikc, master control protection module 3 calculates the zero-sequence current phasor of main line and branch line againIts
In, k=0,1,2 ..., 8, then calculateJudge the leak current fault of main line or branch line, nowThe power network main line of 380V leaks electricity, and master control protection module 3 passes through main line ethernet communication module 1-6
Remote command trunk controller 1-5 control main line tripping operation performing module 1-7 trip operations, cut off power network main line leak current fault, together
When, master control protection module 3 is to the transmission power network main line electric leakage result of host computer 8.
Embodiment 2
When the present invention is used, for the electric power system of 380V, it is 8, C to use branch line quantity nΣ=2.48 μ F, system
During overcompensation 10%, the electric power system of L=1.238H calculates leak resistance value RgDuring=100 Ω, leak resistance value RgIt is less than
The electric leakage action resistance value R of 3.5k Ωdz, the power network generation leak current fault of 380V；8 branch line intelligent terminals are used in the present embodiment
2 gather 8 branch line currents of branch line respectively, using the rail current progress of disease circuit 1-1 collection main line electricity in main line intelligent terminal 1
Stream i0a、i0bAnd i0c, as k=0, master control protection module 3 calculates power network main line zero-sequence current ik0=ika+ikb+ikc, when k ≠ 0
When, gather each branch line current i using 8 branch line intelligent terminals 2ka、ikbAnd ikc, k=1,2 ..., 8, master control protection module 3 is counted
Calculate branch line zero-sequence current ik0=ika+ikb+ikc, master control protection module 3 calculates the zero-sequence current phasor of main line and branch line againIts
In, k=0,1,2 ..., 8, then calculateJudge the leak current fault of main line or branch line, nowTherefore the power network branch line of 380V leaks electricity；Each branch collected respectively using 8 intelligent terminals 2
Line current ika、ikbAnd ikc, k=1,2 ..., 8, master control protection module 3 calculates branch line three-phase additivity electric current Δ ika、Δikb
With Δ ikc, then calculate the instantaneous forward-order current of leak current faultReal partObtain first leak current fault wink of branch line
When forward-order current real partThe real part of the instantaneous forward-order current of leak current fault of Article 2 branch lineArticle 3
The real part of the instantaneous forward-order current of leak current fault of branch lineThe reality of the instantaneous forward-order current of leak current fault of Article 4 branch line
PortionThe real part of the instantaneous forward-order current of leak current fault of Article 5 branch lineThe leak current fault of Article 6 branch line
The real part of instantaneous forward-order currentThe real part of the instantaneous forward-order current of leak current fault of Article 7 branch lineWith
The real part of the instantaneous forward-order current of leak current fault of eight branch linesUsing least square matrix pencil algorithm to leak current fault
Instantaneous forward-order currentReal partCarry out power frequency component amplitudeExtraction；Under the simulated environment of MATLAB,
The real part of the instantaneous forward-order current of leak current fault of first branch line50Hz works are extracted by least square matrix pencil algorithm
Frequency component amplitudeIt is 0.0111；The real part of the instantaneous forward-order current of leak current fault of Article 2 branch lineBy minimum
Two multiply matrix pencil algorithm extracts 50Hz power frequency component amplitudesIt is 6.4465 × 10-6≈0；The leak current fault wink of Article 3 branch line
When forward-order current real part50Hz power frequency component amplitudes are extracted by least square matrix pencil algorithmIt is 6.9135
×10-6≈0；The real part of the instantaneous forward-order current of leak current fault of Article 4 branch lineBy least square matrix pencil algorithm
Extract 50Hz power frequency component amplitudesIt is 6.1836 × 10-6≈0；The reality of the instantaneous forward-order current of leak current fault of Article 5 branch line
Portion50Hz power frequency component amplitudes are extracted by least square matrix pencil algorithmIt is 6.4049 × 10-6≈0；6th
The real part of the instantaneous forward-order current of leak current fault of bar branch line50Hz power frequencies point are extracted by least square matrix pencil algorithm
Amount amplitudeIt is 6.8633 × 10-6≈0；The real part of the instantaneous forward-order current of leak current fault of Article 7 branch linePass through
Least square matrix pencil algorithm extracts 50Hz power frequency component amplitudesIt is 6.8634 × 10-6≈0；The electric leakage event of Article 8 branch line
Hinder the real part of instantaneous forward-order current50Hz power frequency component amplitudes are extracted by least square matrix pencil algorithmFor
6.8633×10-6≈0；Wherein, the real part of the instantaneous forward-order current of the leak current fault of first branch lineCorresponding 50Hz
Power frequency component amplitudeMaximum, then first branch line is leak current fault branch line；Master control protection module 3 is by first branch line
The branch line ethernet communication module 2-5 remote commands branch lines on branch controller 2-4 control branch line tripping operation performing modules 2-6
Trip operation, cuts off power network branch line leak current fault, meanwhile, master control protection module 3 is to the transmission power network branch line electric leakage knot of host computer 8
Really, in experiment the non-leak current fault branch line of Amplitude Ration of the instantaneous forward-order current real part of leak current fault branch line instantaneous forward-order current reality
The big several orders of magnitude of the amplitude in portion, it is possible to verify reliability of this inventive method for leak current fault branch line options, do not receive
The influence of leak current fault type, leak current fault time and leak current fault place.
The above, is only presently preferred embodiments of the present invention, and not the present invention is imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (5)
1. the power system in mines electric leakage discrimination method of the instantaneous forward-order current real component of failure is based on, it is characterised in that the method includes
Following steps：
Step one, the acquisition of electric leakage signal, storage and synchronized upload：Using main line intelligent terminal (1) for main line three-phase current,
Line voltage and residual voltage parameter are acquired and carry out main line trip protection, using branch line intelligent terminal (2) for branch line
Three-phase current is acquired and carries out branch line trip protection, and main line intelligent terminal (1) and branch line intelligent terminal (2) pass through ether
Network Communication module is communicated with master control protection module (3), and the data storage that master control protection module (3) will be obtained is in data storage
In device (5) and synchronized upload is to host computer (8)；
The main line Ethernet that the main line intelligent terminal (1) connects including trunk controller (1-8) and with trunk controller (1-8)
Communication module (1-9), the input of trunk controller (1-8) is terminated with main line analog-digital converter (1-7), main line analog-digital converter
The input of (1-7) is terminated with the collection of main line three-phase current acquisition processing module, line voltage acquisition processing module and residual voltage
Processing module, the output of trunk controller (1-8) is terminated with main line tripping operation performing module (1-10), and the main line three-phase current is adopted
Collection processing module includes main line three-phase current progress of disease circuit (1-1) and connects with main line the three-phase current progress of disease circuit (1-1) output end
Main line three-phase current wave filter (1-2) for connecing, the line voltage acquisition processing module includes line voltage progress of disease circuit (1-3)
And the line voltage wave filter (1-4) being connected with the line voltage progress of disease circuit (1-3) output end, the residual voltage acquisition process
Module includes residual voltage progress of disease circuit (1-5) and the residual voltage filter being connected with the residual voltage progress of disease circuit (1-5) output end
Ripple device (1-6)；
The branch line Ethernet that the branch line intelligent terminal (2) connects including branch controller (2-4) and with branch controller (2-4)
Communication module (2-5), the input of branch controller (2-4) is terminated with branch line three-phase current acquisition processing module, branch controller
The output of (2-4) is terminated with branch line tripping operation performing module (2-6), and the branch line three-phase current acquisition processing module includes connecting successively
Branch line three-phase current progress of disease circuit (2-1), branch line three-phase current wave filter (2-2) and the branch line analog-digital converter (2-3) for connecing；
The quantity of the branch line intelligent terminal (2) is multiple；
Step 2, the reception of electric leakage signal and analyzing and processing：Control of the main line analog-digital converter (1-7) in trunk controller (1-8)
Under system, periodic sampling is carried out to the main line three-phase current after after filtering, line voltage and residual voltage signal, and adopt to each
The signal gathered in the sample cycle export after analog-to-digital conversion giving trunk controller (1-8), and trunk controller (1-8) connects to it
Main line three-phase current, line voltage and the residual voltage signal for receiving pass through main line ethernet communication module after being analyzed treatment
(1-9) is transmitted to master control protection module (3)；Branch line analog-digital converter (2-3) under the control of branch controller (2-4), to warp
Crossing filtered branch line three-phase current signal carries out periodic sampling, and signal to being gathered in each sampling period carries out modulus
Exported after conversion and give branch controller (2-4), the branch line three-phase current that branch controller (2-4) is received to it is analyzed place
Transmitted to master control protection module (3) by branch line ethernet communication module (2-5) after reason；
Step 3, grid power leakage whether judgement, process are as follows：
Step 301, according to formulaCalculate leak resistance Rg, wherein, ω is angular frequency, CΣFor power network is total
Direct-to-ground capacitance, L be zero-sequence reactor compensate inductance, ULIt is master control protection module (3) at the line voltage analysis that receives
The line voltage virtual value that reason is obtained, U0For master control protection module (3) analyzes and processes obtain zero to the residual voltage for receiving
Sequence voltage virtual value；
Step 302, judge whether power network leaks electricity：First, repeat step 301, calculate the multiple electric leakages in continuous a cycle
Resistance value Rg, then, master control protection module (3) is by the multiple leak resistance value R in a cyclegElectric leakage with setting acts electricity
Resistance RdzIt is compared, as the multiple leak resistance value R in continuous a cyclegRespectively less than electric leakage action resistance value RdzWhen, sentence
Break as grid power leakage occurs, perform step 4；Otherwise, it is judged as grid power leakage, return to step two；
The judgement whether step 4, power network main line leak electricity, detailed process is as follows：
Step 401, according to ik0=ika+ikb+ikc, the instantaneous zero sequence current of main line and branch line is calculated, wherein, k=0,1,
2 ... ..., M, M are branch line number, and M >=2 and M are positive integer, as k=0, i00=i0a+i0b+i0cIt is main line instantaneous zero sequence electricity
Stream, i0a、i0bAnd i0cRespectively each phase current values in the main line of main line intelligent terminal (1) acquisition process；When k is 1~M, ik0For
The zero-sequence current of each branch line, ika、ikbAnd ikcIt is each in each branch line of branch line intelligent terminal (2) acquisition process of respectively each branch line
Phase current values；
Step 402, the zero-sequence current phasor for calculating main line and branch lineMaster control protection module (3) uses least square pencil of matrix
Algorithm calculates the virtual value I of zero-sequence current under main line and branch line power frequencyk0With phase αk0, obtain the zero-sequence current of main line and branch line
Phasor
Step 403, according to formulaCalculate the modulus value ∑ I of the phasor sum of zero-sequence currentk0；
Step 404, judge whether power network main line leaks electricity：Master control protection module (3) is by ∑ I in step 403k0Value, judgement is
The electric leakage of power network main line or the electric leakage of power network branch line, as ∑ Ik0When ≠ 0, it is judged as that power network main line leaks electricity, performs step 5；When
∑Ik0When=0, it is judged as that power network branch line leaks electricity, performs step 6；
The electric leakage result output of step 5, power network main line earth leakage protective and power network main line：Master control protection module (3) is by main line ether
Network Communication module (1-9) transmission trip signal gives trunk controller (1-8), and trunk controller (1-8) control main line tripping operation is performed
Module (1-10) trip operation, cuts off power network main line leak current fault；Meanwhile, master control protection module (3) is by liquid crystal touch screen (6)
To host computer (8) transmission power network main line electric leakage result while display output power network main line electric leakage result；
Step 6, the identification of grid power leakage branch line, result output and power network branch line earth leakage protective：Master control protection module (3) is obtained
The data of branch line intelligent terminal (2) transmission, locate respectively to branch line three-phase leak current fault electric current in M branch line in step 401
Reason, the processing method all same of the branch line three-phase leak current fault electric current in each branch line；To the branch line three-phase electric leakage in any branch line
When fault current is processed, detailed process is as follows：
Step 601, calculating branch line three-phase additivity electric current and additivity current variable：First, master control protection module (3) root
According to formulaCalculate branch line three-phase additivity electric current Δ ika(n)、Δikb(n) and Δ ikc
(n), wherein, ika(n)、ikb(n) and ikcN () is that the kth bar branch line of branch controller (2-4) sampling leaks electricity in latter cycle T
The three-phase current of each sampling instant, ika(n-N)、ikbAnd i (n-N)kc(n-N) it is the kth bar branch of branch controller (2-4) sampling
The three-phase current of each sampling instant in the previous cycle T of line leak current fault,M=1,2 ... ..., N, N are a cycle
Sampling number and N on T are positive integer；Then, by branch line three-phase additivity electric current Δ ika(n)、Δikb(n) and Δ ikc(n)
Composition additivity current variable Δ Ik, Δ Ik=[Δ ika(n),Δikb(n),Δikc(n)]T；
Step 602, the calculating instantaneous forward-order current of leak current faultReal partAccording to formulaObtain the instantaneous forward-order current of leak current fault
Instantaneous forward-order current is obtained againReal partWherein, s120And s240To move
Phase factor, s120=ej120°=cos120 °+jsin120 °, s240=ej240°=cos240 °+jsin240 °；
Step 603, the acquisition instantaneous forward-order current of leak current faultReal partAmplitudeMould is protected in master control
Block (3) is using least square matrix pencil algorithm to the instantaneous forward-order current of leak current fault in step 602Real partCarry out power frequency component amplitudeExtraction；
Step 604, M repeat step 601, until completing the instantaneous forward-order current of leak current fault on each branch lineReal partPower frequency component amplitudeThe calculating process of extraction；
The identification of step 605, grid power leakage branch line：Master control protection module (3) is leaked electricity by each branch line in comparison step 604
The instantaneous forward-order current of failureReal partPower frequency component amplitudeSize, selects amplitude maximum
Branch line, then this branch line is leak current fault branch line；
Step 606, grid power leakage branch line result synchronism output：Master control protection module (3) according to the result obtained in step 605 to
Host computer (8) transmission power network branch line electric leakage result simultaneously passes through liquid crystal touch screen (6) synchronism output；
Step 607, grid power leakage branch line earth leakage protective：Master control protection module (3) controls the instantaneous forward-order current of leak current fault
Real partPower frequency component amplitudeBranch line intelligent terminal (2) action in maximum branch line, and by the branch
Branch line ethernet communication module (2-5) remote command branch controller (2-4) control branch line tripping operation in line intelligent terminal (2) is held
Row module (2-6) trip operation, cuts off power network branch line leak current fault.
2. according to the electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure described in claim 1,
It is characterized in that：Master control protection module (3) is calculated under main line and branch line power frequency by least square matrix pencil algorithm in step 402
The virtual value I of zero-sequence currentk0With phase αk0, and in step 603 master control protection module (3) is calculated by least square pencil of matrix
Method calculates the instantaneous forward-order current of leak current faultReal partAmplitudeWhen, detailed process is as follows：
Step I, the effective pencil of matrix Y of structure2-λY1, wherein,
Y (n) be signal observation andL is beam parameter, and L is just whole
Number andF (n) is noise signal,For P has any amplitude, phase in actually active signal
The linear combination of the exponential function of position, frequency and decay factor, RiIt is i-th multiple amplitude of signal, DiIt is i-th signal
The signal attenuation factor, ωiIt is i-th angular frequency of signal, P is signal exponent number,
Step II, solution zi：First, according to pencil of matrix principle, ziIt is active matrix beam Y2-λY1Generalized eigenvalue；Then, it is right
Formula Y2bi=ziY1biIt is multiplied by Y simultaneously in both sides1 +, obtain (Y1 +Y2-ziI)bi=0, wherein, biIt is ziGeneralized eigenvector, Y1 +
It is Y1Pseudo inverse matrix；Finally, Y is solved by master control protection module (3)1 +Y2Characteristic root obtain zi；
Step III, according to least square solution matrix equationWherein p' is ziIn
The number of nonzero eigenvalue, tries to achieveAiIt is i-th signal amplitude of signal；
Step IV, determine the instantaneous forward-order current of each branch roadReal partMiddle 50Hz power frequency components amplitude
3. according to the electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure described in claim 2,
It is characterized in that：In step 402 under main line and branch line power frequency zero-sequence current virtual value Ik0With phase αk0Using step I~step
Rapid IV is tried to achieve, and the y (n) in step I is the instantaneous zero sequence current i of main line and branch linek0Observation, try to achieveMaster control protection module (3) is by the corresponding amplitude A of power frequency component that step IV finds out 50Hzi
And phase thetai, obtain the virtual value I of zero-sequence current under main line and branch line power frequencyk0With phase αk0。
4. according to the electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure described in claim 2,
It is characterized in that：The instantaneous forward-order current of leak current fault in step 603Real partAmplitudeUsing step
Rapid I~step IV is tried to achieve, and the y (n) in step I is the instantaneous forward-order current of leak current faultReal partWidth
ValueObservation, try to achieveMaster control protection module (3) finds out the power frequency component that step IV finds out 50Hz
Corresponding amplitude Ai, obtain the instantaneous forward-order current of leak current faultReal partAmplitude
5. according to the electric leakage discrimination method of the power system in mines based on the instantaneous forward-order current real component of failure described in claim 1,
It is characterized in that：Main line three-phase current wave filter (1-2), line voltage wave filter (1-4), residual voltage wave filter in step one
(1-6) and branch line three-phase current wave filter (2-2) are RC low pass filters.
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