CN106370960A - Mine's power grid electric leakage identification method based on the real component of the fault instantaneous positive sequence current - Google Patents

Abstract

The invention discloses a mine's power grid electric leakage identification method based on the real component of the fault instantaneous positive sequence current. The method comprises the following steps: 1) obtaining, saving and synchronously updating the electric leakage signals; 2) receiving, analyzing and processing the electric leakage signals; 3) determining whether a power grid electric leakage occurs or not; 4) determining whether a power grid trunk electric leakage occurs or not; 5) protecting the power grid trunk electric leakage and outputting a power grid trunk electric leakage result; and 6) identifying the power grid electric leakage branch line, outputting the result, and protecting the power grid electric leakage branch lines. The invention is novel in design, and the phase sum mode value of the zero sequence current is used to determine the power leakage faults in trunk or branch line, which can overcome the problem that in the traditional leakage detection method, trunk fault can not be separated from the branch line fault. Through the amplitude of the real component of the fault instantaneous positive sequence current to tell a power grid electric leakage branch line, an obvious effect can be achieved for line selecting. In addition, the line selecting method is also very self-adaptive.

Description

Power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component

Technical field

The invention belongs to mine low-voltage electricity grid electric leakage protection technology field is and in particular to a kind of be based on fault instantaneous positive sequence electricity The power system in mines electric leakage discrimination method of stream real component.

Background technology

At present, leak current fault, as one of modal leak current fault of mine low-voltage electricity grid (380v, 660v, 1140v), accounts for The 70% about 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 Fried, immeasurable consequence is caused to the person and production safety." safety regulations in coal mine " specifies: " should be on mine low pressure feeder line Leak detection protection device with earth leakage search/lockout is installed, when showing on leakage detection apparatus that generation electric leakage or system insulation level reduce, Must cut off the electricity supply immediately, can power transmission after the completion of process ".

Under special coal production environment, once leaking electricity, must accurately pick out the branch road of electric leakage, and move rapidly Make in tripping operation, accurately fault branch is excised from system it is ensured that the normal power supply of non-faulting part；Otherwise it is possible to Cause down-hole important power supply unit power failure, affect Safety of Coal Mine Production.There are the selection method differing from medium voltage network, mine electric Net has the requirement of " limiting safe electric current " and operation time limit 30ms, and electric leakage needs action immediately in tripping operation.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, and at the electric power incoming line of mine low-voltage electricity grid, generally the total leak detection equipped with DC detecting type continues 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 inefficacy uniquely with choosing leakage function.In addition existing earth leakage protecting method exists and can not have The identification main failure of effect and the defect of fault of branch line, once fault of branch line is mistaken for main failure, undoubtedly can expand power failure Scope.

Content of the invention

The technical problem to be solved is for above-mentioned deficiency of the prior art, provides one kind to be based on fault 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, overcomes traditional leakage selecting method and can not distinguish asking of main line and fault of branch line Topic, recognizes grid power leakage branch line 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.

For solving above-mentioned technical problem, the technical solution used in the present invention is: is divided based on fault instantaneous forward-order current real part The power system in mines electric leakage discrimination method of amount is it is characterised in that the method comprises 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 are all by ethernet communication Module is communicated with master control protection module, and master control protection module is by the data storage obtaining in data storage and in synchronization Reach host computer；

Described main line intelligent terminal includes trunk controller and the main line ethernet communication module connecting 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 is terminated with Main line tripping operation performing module, described main line three-phase current acquisition processing module includes main line three-phase current change of disease circuit and and main line The main line three-phase current wave filter that three-phase current change of disease circuit output end connects, described line voltage acquisition processing module includes electricity Net voltage change of disease circuit and the line voltage wave filter being connected with line voltage change of disease circuit output end, described residual voltage collection Processing module includes residual voltage change of disease circuit and the residual voltage wave filter being connected with residual voltage change of disease circuit output end；

Described branch line intelligent terminal includes branch controller and the branch line ethernet communication module connecting 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, described branch line three-phase current acquisition processing module includes branch line three-phase current change of disease circuit, the branch line being sequentially connected Three-phase current wave filter and branch line analog-digital converter；

The quantity of described branch line intelligent terminal is multiple；

Step 2, the reception of electric leakage signal and analyzing and processing: main line analog-digital converter is under the control of trunk controller, right Main line three-phase current after after filtering, line voltage and residual voltage signal carry out periodic sampling, and to each sampling period Interior gathered signal exports to trunk controller after carrying out analog digital conversion, the main line three-phase electricity that trunk controller receives to it Stream, line voltage and residual voltage signal protect mould by main line ethernet communication module transfer to master control after being analyzed processing Block；Branch line analog-digital converter, under the control of branch controller, enters line period to the branch line three-phase current signal after after filtering Sampling, and the signal being gathered in each sampling period is carried out exporting to branch controller, branch controller after analog digital conversion The branch line three-phase current that it is received protects mould by branch line ethernet communication module transfer to master control after being analyzed processing Block；

The whether judgement of step 3, grid power leakage, process is as follows:

Step 301, according to formulaCalculate leak resistance r_g, wherein, ω is angular frequency, c_σFor electricity Net total direct-to-ground capacitance, l compensates inductance, u for zero-sequence reactor_lFor master control protection module to the line voltage analysis receiving at Manage the line voltage virtual value obtaining, u₀The zero sequence electricity residual voltage analyzing and processing receiving being obtained for master control protection module It is pressed with valid value；

Step 302, judge whether electrical network leaks electricity: first, repeat step 301, calculate multiple in continuous a cycle Leak resistance value r_g, then, master control protection module is by multiple leak resistance values r in a cycle_gWith the electric leakage action electricity setting Resistance r_dzIt is compared, when multiple leak resistance values r in continuous a cycle_gIt is respectively less than electric leakage action resistance value r_dzWhen, sentence Break and occur for grid power leakage, execution step four；Otherwise, it is judged as not occurring grid power leakage, return to step two；

The judgement whether step 4, electrical network main line leak electricity, detailed process is as follows:

Step 401, according to i_k0=i_ka+i_kb+i_kc, calculate the instantaneous zero sequence current of main line and branch line, wherein, k=0,1, 2 ... ..., m, m are branch line number, and m >=2 and m are positive integer, as k=0, i₀₀=i_0a+i_0b+i_0cFor main line instantaneous zero sequence electricity Stream, i_0a、i_0bAnd i_0cIt is respectively each phase current values in the main line of main line intelligent terminal's acquisition process；When k is 1～m, i_k0For each The zero-sequence current of branch line, i_ka、i_kbAnd i_kcIt is respectively each phase current in each branch line of branch line intelligent terminal's acquisition process of each branch line Value；

The zero-sequence current phasor of step 402, calculating main line and branch lineMaster control protection module adopts least square matrix Bundle algorithm calculates virtual value i of zero-sequence current under main line and branch line power frequency_k0With phase place α_k0, 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 current_k0；

Step 404, judge whether electrical network main line leaks electricity: master control protection module passes through ∑ i in step 403_k0Value, judgement is The electric leakage of electrical network main line or the electric leakage of electrical network branch line, as ∑ i_k0When ≠ 0, it is judged as that electrical network main line leaks electricity, execution step five；When ∑i_k0When=0, it is judged as that electrical network branch line leaks electricity, execution step six；

Step 5, electrical network main line earth leakage protective and electrical network main line electric leakage result output: master control protection module pass through 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 electrical network main line leak current fault；Meanwhile, master control protection module is by liquid crystal touch screen display output electrical network main line electric leakage result While to host computer transmission electrical network main line electric leakage result；

Step 6, the identification of grid power leakage branch line, result output and electrical network branch line earth leakage protective: master control protection module obtains The data of branch line intelligent terminal transmission, is 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 arbitrary 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 i_ka(n)、δi_kb(n) and δ i_kc(n), wherein, i_ka(n)、i_kb(n) and i_kcEach on the n kth bar branch line rear cycle t of electric leakage that () is sampled for branch controller The three-phase current of sampling instant, i_ka(n-n)、i_kbAnd i (n-n)_kc(n-n) for the kth bar branch line electric leakage event of branch controller sampling Hinder the three-phase current of each sampling instant on previous cycle t,N is on a cycle t Sampling number and n be positive integer；Then, by branch line three-phase additivity electric current δ i_ka(n)、δi_kb(n) and δ i_kc(n) group Become additivity current variable δ i_k, δ i_k=[δ i_ka(n),δi_kb(n),δi_kc(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 Obtain instantaneous forward-order current againReal part Wherein, s₁₂₀And s₂₄₀For phase shift factor, s₁₂₀=e^j120°=cos120 °+jsin120 °, s₂₄₀=e^j240°= cos240°+jsin240°；

Step 603, the acquisition instantaneous forward-order current of leak current faultReal partAmplitudeMaster control Protection module adopt least square matrix pencil algorithm to leak current fault in step 602 instantaneous forward-order currentReal partCarry out power frequency component amplitudeExtraction；

Step 604, m repeat step 601, until complete the instantaneous forward-order current of leak current fault on each branch line's Real partPower frequency component amplitudeThe calculating process extracted；

Step 605, the identification of grid power leakage branch line: master control protection module is passed through to leak on each branch line in comparison step 604 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 obtaining in step 605 To host computer transmission electrical 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's action in maximum branch line, and pass through Branch line ethernet communication module remote command branch controller in this branch line intelligent terminal controls branch line tripping operation performing module to jump Lock action, excises electrical network branch line leak current fault.

The above-mentioned power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component it is characterised in that: In step 402, 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 Value i_k0With phase place α_k0, and in step 603, master control protection module is instantaneous by least square matrix pencil algorithm calculating leak current fault Forward-order currentReal partAmplitudeWhen, detailed process is as follows:

Step ι, the effective pencil of matrix y of structure₂-λy₁, wherein,

$y_1={\left[\begin{array}{cccc}y\left(1\right)& y\left(2\right)& \mathrm{...}& y\left(l\right)\\ y\left(2\right)& y\left(3\right)& \mathrm{...}& y(l+1)\\ \mathrm{...}& \mathrm{...}& \mathrm{...}& \mathrm{...}\\ y(n-l)& y(n-l+1)& \mathrm{...}& y(n-1)\end{array}\right]}_{(n-l)\×l},$

$y_2={\left[\begin{array}{cccc}y\left(2\right)& y\left(3\right)& \mathrm{...}& y(l+1)\\ y\left(3\right)& y\left(4\right)& \mathrm{...}& y(l+2)\\ \mathrm{...}& \mathrm{...}& \mathrm{...}& \mathrm{...}\\ y(n-l+1)& y(n-l+2)& \mathrm{...}& y\left(n\right)\end{array}\right]}_{(n-l)\×l},$

Y (n) be signal observation andL is bundle parameter, and l is Positive integer andF (n) is noise signal,For p in actually active signal have any amplitude, The linear combination of the exponential function of phase place, frequency and decay factor, r_iFor the multiple amplitude of i-th signal, d_iBelieve for i-th Number the signal attenuation factor, ω_iFor the angular frequency of i-th signal, p is signal exponent number,

Step ι ι, solution z_i: first, according to pencil of matrix principle, z_iFor active matrix bundle y₂-λy₁Generalized eigenvalue；So Afterwards, to formula y₂b_i=z_iy₁b_iY is multiplied by both sides simultaneously₁ ⁺, obtain (y₁ ⁺y₂-z_ii)b_i=0, wherein, b_iFor z_iGeneralized character to Amount, y₁ ⁺For y₁Pseudo inverse matrix；Finally, y is solved by master control protection module₁ ⁺y₂Characteristic root obtain z_i；

Step ι ι ι, according to least square solution matrix equationWherein p' is z_iThe number of middle nonzero eigenvalue, tries to achievea_iSignal amplitude for i-th signal；

Step ι v, determine the instantaneous forward-order current of each branch roadReal partMiddle 50hz power frequency component amplitude

The above-mentioned power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component it is characterised in that: Virtual value i of zero-sequence current under main line and branch line power frequency in step 402_k0With phase place α_k0Tried to achieve using step ι～step ι v, step Y (n) in rapid ι is the instantaneous zero sequence current i of main line and branch line_k0Observation, try to achieve Master control protection module finds out corresponding amplitude a of power frequency component of 50hz by step ι v_iAnd phase theta_i, obtain main line and a lineman Virtual value i of the lower zero-sequence current of frequency_k0With phase place α_k0.

The above-mentioned power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component it is characterised in that: The instantaneous forward-order current of leak current fault in step 603Real partAmplitudeUsing step ι～step ι v Try to achieve, the y (n) in step ι is the instantaneous forward-order current of leak current faultReal partAmplitudeObservation Value, tries to achieveMaster control protection module finds out corresponding amplitude a of power frequency component that step ι v finds out 50hz_i, obtain The instantaneous forward-order current of leak current faultReal partAmplitude

The above-mentioned power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component 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 filter.

The present invention compared with prior art has the advantage that

1st, method of the present invention step is simple, reasonable in design, realizes conveniently and input cost is low, easy and simple to handle.

2nd, the present invention judges main line or branch line leak current fault by the modulus value of the phasor sum of zero-sequence current, i.e. difference current Method difference main line leak current fault and branch line leak current fault, overcome traditional leakage selecting method and can not distinguish main line and fault of branch line Problem, improves the reliability of electric leakage identification.

3rd, the present invention passes through real-time acquisition and the process of data, to leak current fault energy fast reaction so that protection has very Good quick-action, can fully meet industry standard, and protection comprehensively and does not have operating dead zone, is not subject to leak current fault type, electric leakage event Downtime and the impact in leak current fault place, the reliability of protection is high.

4th, the amplitude size of the real part by the instantaneous forward-order current of branch line leak current fault for the present invention differentiates electric leakage branch road, therefore Substantially, it is higher to compare traditional leakage selecting method reliability for barrier branch road feature and non-faulting branch road feature difference, and selection method from Strong adaptability.

5th, the present invention extracts fault power frequency characteristic quantity using least square matrix pencil algorithm from transient process signal, is not subject to System frequency change impact, more accurate than traditional fft method.

6th, the present invention adopts intelligent terminal's 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 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, overcomes the problem that traditional leakage selecting method can not distinguish 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

The schematic block circuit diagram of the power system in mines electric leakage identification apparatus that Fig. 1 adopts for the present invention.

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 of the present invention electric leakage discrimination method.

Description of reference numerals:

1 main line intelligent terminal；1-1 main line three-phase current change of disease circuit；

1-2 main line three-phase current wave filter；1-3 line voltage change of disease circuit；

1-4 line voltage wave filter；1-5 residual voltage change 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 change 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 modules；4 failure indication modules；5 data storages；

6 liquid crystal touch screens；7 serial communication circuit modules；8 host computers.

Specific embodiment

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the power system in mines based on fault instantaneous forward-order current real component for the present invention 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 are all by ether Netcom Letter module communicated with master control protection module 3, master control protection module 3 by acquisition data storage in data storage 5 simultaneously Synchronized upload is to host computer 8；

In actually used, the data storage obtaining and is passed through serial communication in data storage 5 by master control protection module 3 To host computer 8, the quantity of branch line intelligent terminal 2 is multiple to circuit module 7 synchronized upload, the output termination of master control protection module 3 Faulty indicating module 4, described failure indication module 4 includes multiple display lamps, and described display 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；

Described main line intelligent terminal 1 includes trunk controller 1-8 and the main line ether Netcom connecting 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 It is terminated with main line three-phase current acquisition processing module, line voltage acquisition processing module and residual voltage acquisition processing module, do The output of lane controller 1-8 is terminated with main line tripping operation performing module 1-10, and described main line three-phase current acquisition processing module includes Main line three-phase current change of disease circuit 1-1 and the main line three-phase current filter being connected with main line three-phase current change of disease circuit 1-1 outfan Ripple device 1-2, described line voltage acquisition processing module include line voltage change of disease circuit 1-3 and with line voltage change of disease circuit 1- The line voltage wave filter 1-4 that 3 outfans connect, described residual voltage acquisition processing module includes residual voltage change of disease circuit 1- 5 and the residual voltage wave filter 1-6 that is connected with residual voltage change of disease circuit 1-5 outfan；

Described branch line intelligent terminal 2 includes branch controller 2-4 and the branch line ether Netcom connecting 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, described branch line three-phase current acquisition processing module includes the branch line three being sequentially connected Phase current change 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 change of disease Circuit 1-1 gathers main line three-phase real-time current, and main line three-phase real-time current is sent after main line three-phase current wave filter 1-2 denoising Enter main line analog-digital converter 1-7 and the current data that main line three-phase current change of disease circuit 1-1 gathers is transformed to trunk controller 1-8 Accessible digital signal；Line voltage change 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 line voltage change of disease circuit 1-3 is gathered by main line analog-digital converter 1-7 is sent into after line voltage wave filter 1-4 denoising According to being transformed to the accessible digital signal of trunk controller 1-8；Residual voltage change of disease circuit 1-5 collection main line three-phase zero sequence electricity Pressure, main line three-phase residual voltage sends into main line analog-digital converter 1-7 by residual voltage after residual voltage wave filter 1-6 denoising The voltage data of change of disease circuit 1-5 collection is transformed to the accessible digital signal of trunk controller 1-8；The branch line three-phase current change of disease Circuit 2-1 gathers branch line three-phase real-time current, and branch line three-phase real-time current is sent after branch line three-phase current wave filter 2-2 denoising Enter branch line analog-digital converter 2-3, the current data of branch line three-phase current change of disease circuit 2-1 collection is transformed to branch controller 2- 4 accessible digital signals；

Step 2, the reception of electric leakage signal and analyzing and processing: main line analog-digital converter 1-7 is in the control of 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 adopts to each The signal being gathered in the sample cycle exports to trunk controller 1-8 after carrying out analog digital conversion, and trunk controller 1-8 receives to it Main line three-phase current, line voltage and residual voltage signal pass through main line ethernet communication module 1-9 after being analyzed processing Transmit to master control protection module 3；Branch line analog-digital converter 2-3 under the control of branch controller 2-4, to after after filtering Line three-phase current signal carries out periodic sampling, and the signal being gathered in each sampling period is carried out exporting after analog digital conversion to Branch controller 2-4, the branch line three-phase current that branch controller 2-4 receives to it passes through branch line ether after being analyzed processing Network Communication module 2-5 is transmitted to master control protection module 3；

The whether judgement of step 3, grid power leakage, process is as follows:

Step 301, according to formulaCalculate leak resistance r_g, wherein, ω is angular frequency, c_σFor electricity Net total direct-to-ground capacitance, l compensates inductance, u for zero-sequence reactor_lFor master control protection module 3 to the line voltage analysis receiving Process the line voltage virtual value obtaining, u₀The zero residual voltage analyzing and processing receiving being obtained for master control protection module 3 Sequence voltage virtual value；

Step 302, judge whether electrical network leaks electricity: first, repeat step 301, calculate multiple in continuous a cycle Leak resistance value r_g, then, master control protection module 3 is by multiple leak resistance values r in a cycle_gWith the electric leakage action setting Resistance value r_dzIt is compared, when multiple leak resistance values r in continuous a cycle_gIt is respectively less than electric leakage action resistance value r_dzWhen, It is judged as that grid power leakage occurs, execution step four；Otherwise, it is judged as not occurring grid power leakage, return to step two；

In the present embodiment, action resistance value r of leaking electricity_dzAccording to mt871-2011, " mine anti-explosion low-voltage alternating-current vacuum feed is opened Close " regulation 1140v mine low-voltage electricity grid electric leakage action resistance value r_dzValue is 20k ω, the leakage of 660v mine low-voltage electricity grid Electronic make resistance value r_dzValue is 11k ω, electric leakage action resistance value r of 380v mine low-voltage electricity grid_dzValue is 3.5k ω；

The judgement whether step 4, electrical network main line leak electricity, detailed process is as follows:

Step 401, according to i_k0=i_ka+i_kb+i_kc, calculate the instantaneous zero sequence current of main line and branch line, wherein, k=0,1, 2 ... ..., m, m are branch line number, and m >=2 and m are positive integer, as k=0, i₀₀=i_0a+i_0b+i_0cFor main line instantaneous zero sequence electricity Stream, i_0a、i_0bAnd i_0cIt is respectively each phase current values in the main line of main line intelligent terminal 1 acquisition process；When k is 1～m, i_k0For each The zero-sequence current of branch line, i_ka、i_kbAnd i_kcIt is respectively each mutually electricity in each branch line of branch line intelligent terminal 2 acquisition process of each branch line Flow valuve；

The quantity of described branch line intelligent terminal 2 is multiple, and in the present embodiment, the quantity of branch line intelligent terminal 2 is m；

The zero-sequence current phasor of step 402, calculating main line and branch lineMaster control protection module 3 adopts least square matrix Bundle algorithm calculates virtual value i of zero-sequence current under main line and branch line power frequency_k0With phase place α_k0, 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 current_k0；

Step 404, judge whether electrical network main line leaks electricity: master control protection module 3 passes through ∑ i in step 403_k0Value, judge It is the electric leakage of electrical network main line or the electric leakage of electrical network branch line, as ∑ i_k0When ≠ 0, it is judged as that electrical network main line leaks electricity, execution step five； As ∑ i_k0When=0, it is judged as that electrical network branch line leaks electricity, execution step six；

Step 5, electrical network main line earth leakage protective and electrical network main line electric leakage result output: master control protection module 3 pass through main line with To trunk controller 1-8, trunk controller 1-8 controls main line tripping operation performing module to too Network Communication module 1-9 transmission trip signal 1-10 trip operation, excises electrical network main line leak current fault；Meanwhile, master control protection module 3 passes through liquid crystal touch screen 6 display output electricity To host computer 8 transmission electrical network main line electric leakage result while net main line electric leakage result；

Step 6, the identification of grid power leakage branch line, result output and electrical network branch line earth leakage protective: master control protection module 3 obtains Take the data of branch line intelligent terminal 2 transmission, 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 arbitrary 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 i_ka(n)、δi_kb(n) and δ i_kc(n), wherein, i_ka(n)、i_kb(n) and i_kcN () is leaked electricity on a rear cycle t for the kth bar branch line that branch controller 2-4 samples The three-phase current of each sampling instant, i_ka(n-n)、i_kbAnd i (n-n)_kc(n-n) for the kth bar branch line of branch controller 2-4 sampling The three-phase current of each sampling instant on leak current fault previous cycle t,N is a week Sampling number on ripple t and n are positive integer；Then, by branch line three-phase additivity electric current δ i_ka(n)、δi_kb(n) and δ i_kc N () forms additivity current variable δ i_k, δ i_k=[δ i_ka(n),δi_kb(n),δi_kc(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 Obtain instantaneous forward-order current againReal part Wherein, s₁₂₀And s₂₄₀For phase shift factor, s₁₂₀=e^j120°=cos120 °+jsin120 °, s₂₄₀=e^j240°= cos240°+jsin240°；

Step 603, the acquisition instantaneous forward-order current of leak current faultReal partAmplitudeMaster control Protection module 3 adopt least square matrix pencil algorithm to leak current fault in step 602 instantaneous forward-order currentReal partCarry out power frequency component amplitudeExtraction；

Step 604, m repeat step 601, until complete the instantaneous forward-order current of leak current fault on each branch line's Real partPower frequency component amplitudeThe calculating process extracted；

Step 605, the identification of grid power leakage branch line: master control protection module 3 is passed through to leak on each branch line in comparison step 604 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 obtaining in step 605 To host computer 8 transmission electrical network branch line electric leakage result and by 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 faultReal partPower frequency component amplitudeBranch line intelligent terminal 2 action in maximum branch line, and pass through Branch line ethernet communication module 2-5 remote command branch controller 2-4 in this branch line intelligent terminal 2 controls branch line tripping operation execution Module 2-6 trip operation, excises electrical network branch line leak current fault.

In the present embodiment, in step 402, master control protection module 3 calculates main line and branch line by least square matrix pencil algorithm Virtual value i of zero-sequence current under power frequency_k0With phase place α_k0, and in step 603, master control protection module 3 passes through least square matrix Bundle algorithm calculates the instantaneous forward-order current of leak current faultReal partAmplitudeWhen, detailed process is as follows:

Step ι, the effective pencil of matrix y of structure₂-λy₁, wherein,

$y_1={\left[\begin{array}{cccc}y\left(1\right)& y\left(2\right)& \mathrm{...}& y\left(l\right)\\ y\left(2\right)& y\left(3\right)& \mathrm{...}& y(l+1)\\ \mathrm{...}& \mathrm{...}& \mathrm{...}& \mathrm{...}\\ y(n-l)& y(n-l+1)& \mathrm{...}& y(n-1)\end{array}\right]}_{(n-l)\×l},$

$y_2={\left[\begin{array}{cccc}y\left(2\right)& y\left(3\right)& \mathrm{...}& y(l+1)\\ y\left(3\right)& y\left(4\right)& \mathrm{...}& y(l+2)\\ \mathrm{...}& \mathrm{...}& \mathrm{...}& \mathrm{...}\\ y(n-l+1)& y(n-l+2)& \mathrm{...}& y\left(n\right)\end{array}\right]}_{(n-l)\×l},$

Y (n) be signal observation andL is bundle parameter, and l is Positive integer andF (n) is noise signal,For p in actually active signal have any amplitude, The linear combination of the exponential function of phase place, frequency and decay factor, r_iFor the multiple amplitude of i-th signal, d_iBelieve for i-th Number the signal attenuation factor, ω_iFor the angular frequency of i-th signal, p is signal exponent number,

Step ι ι, solution z_i: first, according to pencil of matrix principle, z_iFor active matrix bundle y₂-λy₁Generalized eigenvalue；So Afterwards, to formula y₂b_i=z_iy₁b_iY is multiplied by both sides simultaneously₁ ⁺, obtain (y₁ ⁺y₂-z_ii)b_i=0, wherein, b_iFor z_iGeneralized character to Amount, y₁ ⁺For y₁Pseudo inverse matrix；Finally, y is solved by master control protection module 3₁ ⁺y₂Characteristic root obtain z_i；

Step ι ι ι, according to least square solution matrix equationWherein p' is z_iThe number of middle nonzero eigenvalue, tries to achievea_iSignal amplitude for i-th signal；

Step ι v, determine the instantaneous forward-order current of each branch roadReal partMiddle 50hz power frequency component amplitude

In the present embodiment, virtual value i of zero-sequence current under main line and branch line power frequency in step 402_k0With phase place α_k0Using step Rapid ι～step ι v tries to achieve, and the y (n) in step ι is the instantaneous zero sequence current i of main line and branch line_k0Observation, try to achieveMaster control protection module 3 finds out corresponding amplitude a of power frequency component of 50hz by step ι v_i And phase theta_i, obtain virtual value i of zero-sequence current under main line and branch line power frequency_k0With phase place α_k0.

In the present embodiment, the instantaneous forward-order current of leak current fault in step 603Real partAmplitudeTried to achieve using step ι～step ι v, the y (n) in step ι is the instantaneous forward-order current of leak current faultReal partAmplitudeObservation, try to achieveMaster control protection module 3 is found out step ι v and is found out Corresponding amplitude a of power frequency component of 50hz_i, 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 is rc low pass filter.

Embodiment 1

When the present invention uses, for the electric power system of 380v, it is 8, c using branch line quantity n_σ=2.48 μ f, system During overcompensation 10%, the electric power system of l=1.238h, calculate leak resistance value r_gDuring=100 ω, leak resistance value r_gIt is less than Electric leakage action resistance value r of 3.5k ω_dz, the electrical network generation leak current fault of 380v；8 branch line intelligent terminal are adopted in the present embodiment 2 line current gathering 8 branch lines respectively, using the rail current change of disease circuit 1-1 collection main line electricity in main line intelligent terminal 1 Stream i_0a、i_0bAnd i_0c, as k=0, master control protection module 3 calculates electrical network main line zero-sequence current i_k0=i_ka+i_kb+i_kc, when k ≠ 0 When, gather each line current i using 8 branch line intelligent terminal 2_ka、i_kbAnd i_kc, k=1,2 ..., 8, master control protection module 3 is counted Calculate branch line zero-sequence current i_k0=i_ka+i_kb+i_kc, 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 electrical 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 operation, excise electrical network main line leak current fault, with When, master control protection module 3 is to host computer 8 transmission electrical network main line electric leakage result.

Embodiment 2

When the present invention uses, for the electric power system of 380v, it is 8, c using branch line quantity n_σ=2.48 μ f, system During overcompensation 10%, the electric power system of l=1.238h, calculate leak resistance value r_gDuring=100 ω, leak resistance value r_gIt is less than Electric leakage action resistance value r of 3.5k ω_dz, the electrical network generation leak current fault of 380v；8 branch line intelligent terminal are adopted in the present embodiment 2 line current gathering 8 branch lines respectively, using the rail current change of disease circuit 1-1 collection main line electricity in main line intelligent terminal 1 Stream i_0a、i_0bAnd i_0c, as k=0, master control protection module 3 calculates electrical network main line zero-sequence current i_k0=i_ka+i_kb+i_kc, when k ≠ 0 When, gather each line current i using 8 branch line intelligent terminal 2_ka、i_kbAnd i_kc, k=1,2 ..., 8, master control protection module 3 is counted Calculate branch line zero-sequence current i_k0=i_ka+i_kb+i_kc, 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 therefore electrical network branch line of 380v leaks electricity；Collected respectively using 8 intelligent terminal 2 each Prop up line current i_ka、i_kbAnd i_kc, k=1,2 ..., 8, master control protection module 3 calculates branch line three-phase additivity electric current δ i_ka、δ i_kbWith δ ikc, then calculate the instantaneous forward-order current of leak current faultReal partObtain first branch line

The real part of the instantaneous forward-order current of leak current faultThe instantaneous forward-order current of leak current fault of Article 2 branch line Real partThe real part of the instantaneous forward-order current of leak current fault of Article 3 branch lineThe electric leakage event of Article 4 branch line Hinder the real part of instantaneous forward-order currentThe real part of the instantaneous forward-order current of leak current fault of Article 5 branch lineThe Article six, the real part of the instantaneous forward-order current of the leak current fault of branch lineThe instantaneous forward-order current of leak current fault of Article 7 branch line Real partReal part with the instantaneous forward-order current of the leak current fault of Article 8 branch lineUsing least square square Battle array bundle algorithm instantaneous forward-order current to leak current faultReal 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 lineBy least square Matrix pencil algorithm extracts 50hz power frequency component amplitudeFor 0.0111；The instantaneous forward-order current of leak current fault of Article 2 branch line Real part50hz power frequency component amplitude is extracted by least square matrix pencil algorithmFor 6.4465 × 10^-6≈0；The Article three, the real part of the instantaneous forward-order current of the leak current fault of branch line50hz power frequency is extracted by least square matrix pencil algorithm Component amplitudeFor 6.9135 × 10^-6≈0；The real part of the instantaneous forward-order current of leak current fault of Article 4 branch lineLogical Cross least square matrix pencil algorithm and extract 50hz power frequency component amplitudeFor 6.1836 × 10^-6≈0；The electric leakage of Article 5 branch line The real part of the instantaneous forward-order current of fault50hz power frequency component amplitude is extracted by least square matrix pencil algorithmFor 6.4049×10^-6≈0；The real part of the instantaneous forward-order current of leak current fault of Article 6 branch lineBy least square matrix Bundle algorithm extracts 50hz power frequency component amplitudeFor 6.8633 × 10^-6≈0；The leak current fault instantaneous positive sequence electricity of Article 7 branch line The real part of stream50hz power frequency component amplitude is extracted by least square matrix pencil algorithmFor 6.8634 × 10^-6≈ 0；The real part of the instantaneous forward-order current of leak current fault of Article 8 branch line50hz is extracted by least square matrix pencil algorithm Power frequency component amplitudeFor 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 pass through the branch controller 2-4 control on branch line ethernet communication this branch line of module 2-5 remote command on first branch line Line tripping operation performing module 2-6 trip operation, excises electrical network branch line leak current fault, meanwhile, master control protection module 3 passes to host computer 8 Power transmission network branch line electric leakage result, the Amplitude Ration non-leak current fault branch line of the instantaneous forward-order current real part of leak current fault branch line in experiment Instantaneous forward-order current real part the several greatly order of magnitude of amplitude it is possible to verify that this inventive method props up line selection for leak current fault The reliability selected, is not affected by leak current fault type, leak current fault time and leak current fault place.

The above, be only presently preferred embodiments of the present invention, not the present invention 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, all 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 based on fault instantaneous forward-order current real component is 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) are all by ether Network Communication module is communicated with master control protection module (3), and master control protection module (3) is by the data storage obtaining in data storage In device (5) and synchronized upload is to host computer (8)；

Described main line intelligent terminal (1) includes trunk controller (1-8) and the main line Ethernet connecting 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 (1-7) input is terminated with main line three-phase current acquisition processing module, line voltage acquisition processing module and residual voltage collection Processing module, the output of trunk controller (1-8) is terminated with main line tripping operation performing module (1-10), and described main line three-phase current is adopted Collection processing module is included main line three-phase current change of disease circuit (1-1) and is connected with main line three-phase current change of disease circuit (1-1) outfan Main line three-phase current wave filter (1-2) connecing, described line voltage acquisition processing module includes line voltage change of disease circuit (1-3) And the line voltage wave filter (1-4) being connected with line voltage change of disease circuit (1-3) outfan, described residual voltage acquisition process Module includes residual voltage change of disease circuit (1-5) and the residual voltage filter being connected with residual voltage change of disease circuit (1-5) outfan Ripple device (1-6)；

Described branch line intelligent terminal (2) includes branch controller (2-4) and the branch line Ethernet connecting 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 (2-4) output is terminated with branch line tripping operation performing module (2-6), and described branch line three-phase current acquisition processing module includes connecting successively Branch line three-phase current change of disease circuit (2-1), branch line three-phase current wave filter (2-2) and the branch line analog-digital converter (2-3) connecing；

The quantity of described branch line intelligent terminal (2) is multiple；

Step 2, the reception of electric leakage signal and analyzing and processing: main line analog-digital converter (1-7) is in the control of 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 adopts to each The signal being gathered in the sample cycle exports to trunk controller (1-8) after carrying out analog digital conversion, and trunk controller (1-8) connects to it Main line three-phase current, line voltage and the residual voltage signal receiving passes through main line ethernet communication module after being analyzed processing (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 warp Cross filtered branch line three-phase current signal and carry out periodic sampling, and modulus is carried out to the signal being gathered in each sampling period Export to branch controller (2-4) after conversion, the branch line three-phase current that branch controller (2-4) receives to it is analyzed locating Transmitted to master control protection module (3) by branch line ethernet communication module (2-5) after reason；

The whether judgement of step 3, grid power leakage, process is as follows:

Step 301, according to formulaCalculate leak resistance r_g, wherein, ω is angular frequency, c_σTotal for electrical network Direct-to-ground capacitance, l be zero-sequence reactor compensate inductance, u_lFor master control protection module (3) to the line voltage analysis receiving at Manage the line voltage virtual value obtaining, u₀The zero residual voltage analyzing and processing receiving being obtained for master control protection module (3) Sequence voltage virtual value；

Step 302, judge whether electrical network leaks electricity: first, repeat step 301, calculate the multiple electric leakages in continuous a cycle Resistance value r_g, then, master control protection module (3) is by multiple leak resistance values r in a cycle_gWith the electric leakage action electricity setting Resistance r_dzIt is compared, when multiple leak resistance values r in continuous a cycle_gIt is respectively less than electric leakage action resistance value r_dzWhen, sentence Break and occur for grid power leakage, execution step four；Otherwise, it is judged as not occurring grid power leakage, return to step two；

The judgement whether step 4, electrical network main line leak electricity, detailed process is as follows:

Step 401, according to i_k0=i_ka+i_kb+i_kc, calculate the instantaneous zero sequence current of main line and branch line, wherein, k=0,1, 2 ... ..., m, m are branch line number, and m >=2 and m are positive integer, as k=0, i₀₀=i_0a+i_0b+i_0cFor main line instantaneous zero sequence electricity Stream, i_0a、i_0bAnd i_0cIt is respectively each phase current values in the main line of main line intelligent terminal (1) acquisition process；When k is 1～m, i_k0For The zero-sequence current of each branch line, i_ka、i_kbAnd i_kcIt is respectively each in each branch line of branch line intelligent terminal (2) acquisition process of each branch line Phase current values；

The zero-sequence current phasor of step 402, calculating main line and branch lineMaster control protection module (3) adopts least square pencil of matrix Algorithm calculates virtual value i of zero-sequence current under main line and branch line power frequency_k0With phase place α_k0, obtain the zero-sequence current of main line and branch line Phasor

Step 403, according to formulaCalculate the modulus value σ i of the phasor sum of zero-sequence current_k0；

Step 404, judge whether electrical network main line leaks electricity: σ i in step 403 is passed through in master control protection module (3)_k0Value, judgement is The electric leakage of electrical network main line or the electric leakage of electrical network branch line, as σ i_k0When ≠ 0, it is judged as that electrical network main line leaks electricity, execution step five；When σi_k0When=0, it is judged as that electrical network branch line leaks electricity, execution step six；

Step 5, electrical network main line earth leakage protective and the electric leakage result output of electrical network main line: master control protection module (3) passes through main line ether To trunk controller (1-8), trunk controller (1-8) controls main line tripping operation execution to Network Communication module (1-9) transmission trip signal Module (1-10) trip operation, excises electrical network main line leak current fault；Meanwhile, master control protection module (3) passes through liquid crystal touch screen (6) To host computer (8) transmission electrical network main line electric leakage result while display output electrical network main line electric leakage result；

Step 6, the identification of grid power leakage branch line, result output and electrical network branch line earth leakage protective: master control protection module (3) obtains The data that branch line intelligent terminal (2) is transmitted, locates 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 arbitrary 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 i_ka(n)、δi_kb(n) and δ i_kc (n), wherein, i_ka(n)、i_kb(n) and i_kcN () is leaked electricity on a rear cycle t for the kth bar branch line that branch controller (2-4) is sampled The three-phase current of each sampling instant, i_ka(n-n)、i_kbAnd i (n-n)_kc(n-n) the kth bar sampled for branch controller (2-4) props up The three-phase current of each sampling instant on line leak current fault previous cycle t,M=1,2 ... ..., n, n are a week Sampling number on ripple t and n are positive integer；Then, by branch line three-phase additivity electric current δ i_ka(n)、δi_kb(n) and δ i_kc N () forms additivity current variable δ i_k, δ i_k=[δ i_ka(n),δi_kb(n),δi_kc(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 Obtain instantaneous forward-order current againReal part Wherein, s₁₂₀And s₂₄₀For phase shift factor, s₁₂₀=e^j120°=cos120 °+jsin120 °, s₂₄₀=e^j240°= cos240°+jsin240°；

Step 603, the acquisition instantaneous forward-order current of leak current faultReal partAmplitudeMaster control is protected Module (3) adopt least square matrix pencil algorithm to leak current fault in step 602 instantaneous forward-order currentReal partCarry out power frequency component amplitudeExtraction；

Step 604, m repeat step 601, until complete the instantaneous forward-order current of leak current fault on each branch lineReal partPower frequency component amplitudeThe calculating process extracted；

Step 605, the identification of grid power leakage branch line: master control protection module (3) is passed through to leak electricity on each branch line in comparison step 604 The instantaneous forward-order current of faultReal 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 obtaining in step 605 to Host computer (8) transmission electrical 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 pass through this Branch line ethernet communication module (2-5) remote command branch controller (2-4) in line intelligent terminal (2) controls branch line tripping operation to hold Row module (2-6) trip operation, excises electrical network branch line leak current fault.

2. according to the power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component described in claim 1, It is characterized in that: in step 402, master control protection module (3) is calculated under main line and branch line power frequency by least square matrix pencil algorithm Virtual value i of zero-sequence current_k0With phase place α_k0, 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 ι, the effective pencil of matrix y of structure₂-λy₁, wherein,

Y (n) be signal observation andL is bundle parameter, and l is just whole Number andF (n) is noise signal,For p in actually active signal have any amplitude, phase place, The linear combination of the exponential function of frequency and decay factor, r_iFor the multiple amplitude of i-th signal, d_iLetter for i-th signal Number decay factor, ω_iFor the angular frequency of i-th signal, p is signal exponent number,

Step ι ι, solution z_i: first, according to pencil of matrix principle, z_iFor active matrix bundle y₂-λy₁Generalized eigenvalue；Then, right Formula y₂b_i=z_iy₁b_iY is multiplied by both sides simultaneously₁ ⁺, obtain (y₁ ⁺y₂-z_ii)b_i=0, wherein, b_iFor z_iGeneralized eigenvector, y₁ ⁺ For y₁Pseudo inverse matrix；Finally, y is solved by master control protection module (3)₁ ⁺y₂Characteristic root obtain zⁱ；

Step ι ι ι, according to least square solution matrix equationWherein p' is z_iIn The number of nonzero eigenvalue, tries to achievea_iSignal amplitude for i-th signal；

Step ι v, determine the instantaneous forward-order current of each branch roadReal partMiddle 50hz power frequency component amplitude

3. according to the power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component described in claim 2, It is characterized in that: virtual value i of zero-sequence current under main line and branch line power frequency in step 402_k0With phase place α_k0Using step ι～step Rapid ι v tries to achieve, and the y (n) in step ι is the instantaneous zero sequence current i of main line and branch line_k0Observation, try to achieveMaster control protection module (3) finds out corresponding amplitude a of power frequency component of 50hz by step ι v_i And phase theta_i, obtain virtual value i of zero-sequence current under main line and branch line power frequency_k0With phase place α_k0.

4. according to the power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component described in claim 2, It is characterized in that: the instantaneous forward-order current of leak current fault in step 603Real partAmplitudeUsing step Rapid ι～step ι v tries to achieve, and the y (n) in step ι 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 ι v finds out 50hz Corresponding amplitude a_i, obtain the instantaneous forward-order current of leak current faultReal partAmplitude

5. according to the power system in mines electric leakage discrimination method based on fault instantaneous forward-order current real component 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) it is rc low pass filter with branch line three-phase current wave filter (2-2).