CN103779852A - Regional protection system based on adaptive current protection associated factor and method thereof - Google Patents

Abstract

The invention discloses a regional protection system based on an adaptive current protection associated factor and a method thereof, belonging to the technical field of fault diagnosis of power systems. The regional protection system comprises a data acquisition module, a protection effectiveness setting module, a protection effectiveness function generating module, a protection cooperative degree desired function generating module and a fault recognition module. The method comprises the following steps: acquiring the set value and protection action practical state of respective adaptive current protection in a protection region; computing the effectiveness of respective adaptive current protection; computing the protection cooperative degree function value of each line; computing the protection cooperative degree desired function value of each line; computing the adaptive current protection associated factor of each line; identifying a faulty line according to the adaptive current protection associated factor of each line. The regional protection system is adaptive to the change of a power grid running way, the formation of a current protection criterion and the acquisition of a protection action value independent of the synchronism of a communication system, and faults can be adjusted accurately.

Description

Locality protection system and method thereof based on adaptive Current Protection cofactor

Technical field

The invention belongs to electric power system fault recognition technology field, relate in particular to a kind of locality protection system and method thereof based on adaptive Current Protection cofactor.

Background technology

Traditional relaying protection is conventionally brought the fixed value of off-line setting calculation into protection criterion and is judged, at complex structure, in the changeable electrical network of operational mode, traditional relaying protection has been difficult to meet the requirement that system safety is stable.In recent years, the reaching its maturity of self adaptation relaying protection research, and the deepening continuously of area communication technical research, for build can adaptive system changes of operating modes region backup protection system for damping opportunity is provided.

At present, the research of improving relaying protection performance based on area information is roughly divided three classes: (1) is by the research that trend is shifted, under the cooperation of regional power grid security stability control system, effectively excise overload element, reach the object that prevents backup protection cascading trip; (2), by effective utilization of Regional And Multi-source information being formed to new region backup protection algorithm, on the basis of identification fault zone, excise fast fault element, thereby improve relaying protection performance; (3) the powernet self adaptation calculating of adjusting, under current power system operating mode to relaying protection particularly backup protection carry out on-line tuning, make relaying protection keep higher sensitivity and selectivity, in optimum Working.

In the Microcomputer Protection early stage of development, to the research of adaptive Current Protection, mainly based on the local information calculating of adjusting, along with the development of wide-area communication, the condition of the adaptive Current Protection of exploitation based on Wide-area Measurement Information is ripe day by day.But the reliability of the communication technology is still the bottleneck of restriction region backup protection Project Realization, how the in the situation that of communication abnormality, utilizing multi-source information reliable recognition fault is a large difficult point of region backup protection research.Moreover the Wide-area Measurement Information latency issue based on PMU is difficult to avoid, the synchronism of information still can not obtain effective guarantee, also needs to consider the asynchronous problem of communication system in the time building region backup protection scheme.

For the problems referred to above, the present invention proposes a kind of locality protection system and method thereof based on adaptive Current Protection cofactor.First, adaptive Current Protection is moved to the effect of situation in Fault Identification and be defined as the effectiveness degree of adaptive Current Protection, and set it as the weight of information fusion, build adaptive Current Protection collaborative degree function and the collaborative degree of adaptive Current Protection expectation function; Then, the collaborative degree of adaptive Current Protection function and the ratio of collaborative degree expectation function are defined as to adaptive Current Protection cofactor; Finally, by judging the size location fault of adaptive Current Protection cofactor.Adaptive Current Protection criterion has been introduced in this invention, can complete online adjust calculating and the fault judgement of protection, and the variation of energy self adaptation power system operating mode; Meanwhile, the formation of adaptive Current Protection criterion and the synchronism that does not rely on communication system of obtaining of protecting operating value in this algorithm.The in the situation that of adaptive Current Protection action message seniority top digit disappearance or mistake, utilize the present invention still can accurately judge fault.

Summary of the invention

The object of the invention is to, a kind of locality protection system and method thereof based on adaptive Current Protection cofactor is provided, lower and rely on the problem of data synchronism for solving existing region backup protection defencive function fault-tolerance.

To achieve these goals, the technical scheme that the present invention proposes is, a locality protection system based on adaptive Current Protection cofactor, is characterized in that described locality protection system comprises data acquisition module, protection effectiveness degree adjust module, the collaborative degree of protection function generation module, protection collaborative degree expectation function generation module and Fault Identification module;

Described data acquisition module is connected with adjust module and the collaborative function generation module of spending of protection of protection effectiveness degree respectively;

Described protection effectiveness degree is adjusted, and module is worked in coordination with degree function generation module with data acquisition module, protection respectively and the collaborative degree of protection expectation function generation module is connected;

The collaborative degree of described protection function generation module is connected with Fault Identification module with data acquisition module, the protection effectiveness degree module of adjusting respectively;

The collaborative degree of described protection expectation function generation module is connected with Fault Identification module with the protection effectiveness degree module of adjusting respectively;

Described Fault Identification module is connected with the collaborative degree of protection expectation function generation module with the collaborative degree of protection function generation module respectively;

Described data acquisition module is for gathering setting value and the protection action virtual condition of each adaptive Current Protection of protection zone, and the current setting of each adaptive guard collecting is sent to the protection effectiveness degree module of adjusting, each protection action virtual condition collecting is sent to the collaborative degree of protection function generation module;

Wherein, the setting value of adaptive Current Protection comprises I section setting value, the II section setting value of adaptive Current Protection and the III section setting value of adaptive Current Protection of adaptive Current Protection;

The virtual condition of adaptive Current Protection comprises I section virtual condition, the II section virtual condition of adaptive Current Protection and the III section virtual condition of adaptive Current Protection of adaptive Current Protection;

Virtual condition comprises operate condition and non-action state;

Described protection effectiveness degree is adjusted module for according to the setting value of each adaptive Current Protection, calculate the effectiveness degree of each adaptive Current Protection, then the effectiveness degree of each adaptive Current Protection is sent to the collaborative degree of protection function generation module and the collaborative degree of protection expectation function generation module; Wherein, the effectiveness degree of described each adaptive Current Protection comprises I section effectiveness degree, the II section effectiveness degree of each adaptive Current Protection and the III section effectiveness degree of each adaptive Current Protection of each adaptive Current Protection;

The collaborative degree of described protection function generation module is used for according to the effectiveness degree of the virtual condition of each adaptive Current Protection and each adaptive Current Protection, calculate the collaborative degree of the protection functional value of each circuit, the more collaborative degree of the protection of each circuit functional value is sent to Fault Identification module;

The collaborative degree of described protection expectation function generation module is worked in coordination with degree expectation function value for calculate the protection of each circuit according to the effectiveness degree of each adaptive Current Protection, the more collaborative degree of the protection of each circuit expectation function value is sent to Fault Identification module;

Described Fault Identification module is for working in coordination with degree expectation function value according to the protection of the protection of each circuit collaborative degree functional value and each circuit; calculate the adaptive Current Protection cofactor of each circuit, then according to the adaptive Current Protection cofactor identification faulty line of each circuit.

A locality protection method based on adaptive Current Protection cofactor, is characterized in that described locality protection method comprises:

Step 1: the setting value and the protection action virtual condition that gather each adaptive Current Protection in protection zone;

Wherein, the setting value of adaptive Current Protection comprises I section setting value, the II section setting value of adaptive Current Protection and the III section setting value of adaptive Current Protection of adaptive Current Protection;

The virtual condition of adaptive Current Protection comprises I section virtual condition, the II section virtual condition of adaptive Current Protection and the III section virtual condition of adaptive Current Protection of adaptive Current Protection;

Virtual condition comprises operate condition and non-action state;

Step 2: the effectiveness degree that calculates each adaptive Current Protection;

Step 3: the collaborative degree of the protection functional value that calculates each circuit;

Step 4: the collaborative degree of the protection expectation function value of calculating each circuit;

Step 5: the adaptive Current Protection cofactor that calculates each circuit;

Step 6: according to the adaptive Current Protection cofactor identification faulty line of each circuit.

The effectiveness degree of described each adaptive Current Protection of calculating is specially:

Adopt formula

calculate the I section of each adaptive Current Protection to circuit L _ieffectiveness degree;

Adopt formula

calculate the II section of each adaptive Current Protection to circuit L _ieffectiveness degree;

Wherein, for the II section of adaptive Current Protection j is for circuit L _icoverage equivalent impedance, and

Z _lifor circuit L _iimpedance;

Z _li1for circuit L _i1impedance and L _i1for L _ihigher level's circuit;

Z _sfor the comprehensive impedance of system power supply side;

for the setting value of the II section of adaptive Current Protection j;

K _dfor fault type coefficient;

E _sfor the equivalent phase electromotive force of system;

N is the circuit number in the protection range of adaptive Current Protection j;

N is the number of lines in the protection range of adaptive Current Protection j;

Adopt formula calculate the III section of each adaptive Current Protection to circuit L _ieffectiveness degree;

Wherein,

for the III section of adaptive Current Protection j is for circuit L _icoverage equivalent impedance and

Z _li2for circuit L _i2impedance and L _i2for L _i1higher level's circuit;

for the setting value of the III section of adaptive Current Protection j.

The collaborative degree of the protection functional value of each circuit of described calculating adopts formula:

$E_F\left(L_i\right)=\underset{j}{\overset{B_I}{\mathrm{\Σ}}}{\mathrm{\α}}_{\mathrm{ij}}^I{C}_j^I+\underset{j}{\overset{B_{\mathrm{II}}}{\mathrm{\Σ}}}{\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{II}}{C}_j^{\mathrm{II}}+\underset{j}{\overset{B_{\mathrm{III}}}{\mathrm{\Σ}}}{\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{III}}{C}_j^{\mathrm{III}};$

Wherein,

for the I section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the II section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the III section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the I section actual condition value of adaptive Current Protection j after fault generation;

for the II section actual condition value of adaptive Current Protection j after fault generation;

for the III section actual condition value of adaptive Current Protection j after fault generation;

In the time that virtual condition is operate condition, actual condition value gets 1; In the time that virtual condition is non-action state, actual condition value gets 0;

B _ifor the I hop count order of adaptive Current Protection;

B _iIfor the II hop count order of adaptive Current Protection;

B _iIIfor the III hop count order of adaptive Current Protection.

The collaborative degree of the protection expectation function value of calculating each circuit adopts formula:

$E^{*}\left(L_i\right)=\underset{j}{\overset{B_I}{\mathrm{\Σ}}}\left({\mathrm{\α}}_{\mathrm{ij}}^I\underset{t=A,B...}{\mathrm{\Σ}}{\mathrm{\β}}_t^I{C}_{t-\mathrm{ij}}^{*I}\right)+\underset{j}{\overset{B_{\mathrm{II}}}{\mathrm{\Σ}}}\left({\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{II}}\underset{t=A,B....}{\mathrm{\Σ}}{\mathrm{\β}}_t^{\mathrm{II}}{C}_{t-\mathrm{ij}}^{*\mathrm{II}}\right)+\underset{j}{\overset{B_{\mathrm{III}}}{\mathrm{\Σ}}}\left({\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{III}}\underset{t=A,B...}{\mathrm{\Σ}}{\mathrm{\β}}_t^{\mathrm{III}}{C}_{t-\mathrm{ij}}^{\mathrm{III}}\right)$

Wherein,

for the I section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the II section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the III section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for faulty line within the scope of the I of adaptive Current Protection segment protect and fault point be positioned at the probability of faulty line t section;

for faulty line within the scope of the II of adaptive Current Protection segment protect and fault point be positioned at the probability of faulty line t section;

for faulty line within the scope of the III of adaptive Current Protection segment protect and fault point be positioned at the probability of faulty line t section;

for fault occurs in circuit L _it section on time adaptive Current Protection j the desired value of I section in operate condition;

for fault occurs in circuit L _it section on time adaptive Current Protection j the desired value of II section in operate condition;

for fault occurs in circuit L _it section on time adaptive Current Protection j the desired value of III section in operate condition;

T is a section in the protection range of I section, II section and the III section of adaptive Current Protection faulty line is divided into all sections;

B _ifor the I hop count order of adaptive Current Protection;

B _iIfor the II hop count order of adaptive Current Protection;

B _iIIfor the III hop count order of adaptive Current Protection.

The adaptive Current Protection cofactor of each circuit of described calculating adopts formula

Wherein, E _f(L _i) be circuit L _ithe collaborative degree of protection functional value;

E ^*(L _i) be circuit L _ithe collaborative degree of protection expectation function value.

The described identification of the adaptive Current Protection cofactor according to each circuit faulty line is specially: determine the circuit of adaptive Current Protection cofactor value maximum in all circuits, the circuit of described adaptive Current Protection cofactor value maximum is faulty line.

In the present invention, adaptive Current Protection setting value, the action acquisition of situation and the calculating of adaptive Current Protection effectiveness degree, variation that can adaptive system operational mode, and be not subject to that communication system is asynchronous to be affected, the data source of algorithm is very reliable; Using adaptive Current Protection effectiveness degree as the weight that builds protection collaborative degree function and the collaborative degree of protection expectation function, make to protect the calculated value of collaborative degree function and the collaborative degree of protection expectation function more accurate; In addition, algorithm has taken into full account fault-tolerance problem, in adaptive Current Protection action message seniority top digit disappearance or wrong situation, and still accurate failure judgement circuit.

Accompanying drawing explanation

Fig. 1 is the locality protection system construction drawing based on adaptive Current Protection cofactor;

Fig. 2 is regional power grid structure chart;

Fig. 3 is adaptive Current Protection I section action situation desired value sample calculation figure;

Fig. 4 is hypothesis circuit L ₂fault self-adapting current protection I section action situation desired value table;

Fig. 5 is adaptive Current Protection II section action situation desired value sample calculation figure;

Fig. 6 is hypothesis circuit L ₃fault self-adapting current protection II section action situation desired value table;

Fig. 7 is adaptive Current Protection III section action situation desired value sample calculation figure;

Fig. 8 is hypothesis circuit L ₃fault self-adapting current protection III section action situation desired value table;

Fig. 9 is Tianjin power distribution network 10.5KV electrical network figure;

Figure 10 is circuit L ₃the each adaptive Current Protection setting value of fault and action information slip;

Figure 11 is that adaptive Current Protection element is to judging L ₃for the effectiveness degree table of faulty line;

Figure 12 is the collaborative degree of each circuit adaptive Current Protection functional value, collaborative degree expectation function value and the cofactor table of comparisons;

Figure 13 is circuit L ₃the each circuit adaptive Current Protection of fault cofactor figure;

Figure 14 is IEEE33 node system figure;

Figure 15 is circuit L ₁₀the each adaptive Current Protection setting value of fault and action information slip;

Figure 16 is that adaptive Current Protection element is to judging L ₁₀for the effectiveness degree table of faulty line;

Figure 17 is the collaborative degree of each circuit adaptive Current Protection functional value, collaborative degree expectation function value and the cofactor table of comparisons;

Figure 18 is circuit L ₁₀the each circuit adaptive Current Protection of fault cofactor figure;

Figure 19 is circuit L ₂₇the each circuit adaptive Current Protection of fault cofactor figure.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.

Embodiment 1

Fig. 1 is the locality protection system construction drawing based on adaptive Current Protection cofactor.As shown in Figure 1, the locality protection system based on adaptive Current Protection cofactor comprises data acquisition module, protection effectiveness degree adjust module, the collaborative degree of protection function generation module, protection collaborative degree expectation function generation module and Fault Identification module.

Data acquisition module is connected with adjust module and the collaborative function generation module of spending of protection of protection effectiveness degree respectively, protection effectiveness degree adjust module respectively with data acquisition module, the collaborative degree of protection function generation module is connected with the collaborative degree of protection expectation function generation module, the collaborative degree of protection function generation module respectively with data acquisition module, the protection effectiveness degree module of adjusting is connected with Fault Identification module, the collaborative degree of protection expectation function generation module is connected with Fault Identification module with the protection effectiveness degree module of adjusting respectively, Fault Identification module is connected with the collaborative degree of protection expectation function generation module with the collaborative degree of protection function generation module respectively.

Data acquisition module is for gathering setting value and the protection action virtual condition of each adaptive Current Protection of protection zone; and the current setting of each adaptive guard collecting is sent to the protection effectiveness degree module of adjusting, each protection action virtual condition collecting is sent to the collaborative degree of protection function generation module.Wherein, the setting value of adaptive Current Protection comprises I section setting value, the II section setting value of adaptive Current Protection and the III section setting value of adaptive Current Protection of adaptive Current Protection; the virtual condition of adaptive Current Protection comprises I section virtual condition, the II section virtual condition of adaptive Current Protection and the III section virtual condition of adaptive Current Protection of adaptive Current Protection, and virtual condition comprises operate condition and non-action state.

Protection effectiveness degree is adjusted module for according to the setting value of each adaptive Current Protection; calculate the effectiveness degree of each adaptive Current Protection, then the effectiveness degree of each adaptive Current Protection is sent to the collaborative degree of protection function generation module and the collaborative degree of protection expectation function generation module.Wherein, the effectiveness degree of each adaptive Current Protection comprises I section effectiveness degree, the II section effectiveness degree of each adaptive Current Protection and the III section effectiveness degree of each adaptive Current Protection of each adaptive Current Protection.

The collaborative degree of protection function generation module is used for according to the effectiveness degree of the virtual condition of each adaptive Current Protection and each adaptive Current Protection; calculate the collaborative degree of the protection functional value of each circuit, the more collaborative degree of the protection of each circuit functional value is sent to Fault Identification module.

Protection is worked in coordination with degree expectation function generation module for calculate the collaborative expectation function value of spending of protection of each circuit according to the effectiveness degree of each adaptive Current Protection, the more collaborative degree of the protection of each circuit expectation function value is sent to Fault Identification module.

Fault Identification module is for working in coordination with degree expectation function value according to the protection of the protection of each circuit collaborative degree functional value and each circuit; calculate the adaptive Current Protection cofactor of each circuit, then according to the adaptive Current Protection cofactor identification faulty line of each circuit.

A locality protection method based on adaptive Current Protection cofactor, is characterized in that described locality protection method comprises:

Step 1: the setting value and the virtual condition that gather each adaptive Current Protection in protection zone.

First gather I section, II section and III section setting value and the virtual condition of adaptive Current Protection; virtual condition comprises operate condition and non-action state; operate condition uses 1 to represent, non-action state uses 0 to represent, when virtual condition disappearance, (not collecting) also used 0 expression.

Step 2: calculate the effectiveness degree of each adaptive Current Protection protection, comprise I section effectiveness degree, the II section effectiveness degree of each adaptive Current Protection and the III section effectiveness degree of each adaptive Current Protection of each adaptive Current Protection protection.

Relation between the position that reflected the setting principle of adaptive Current Protection adaptive Current Protection action and its positive direction break down.As shown in Figure 2, the I section action of adaptive Current Protection element 1, fault only may occur in circuit L ₁on; The II section action of adaptive Current Protection element 1, fault may occur in circuit L ₁upper, or circuit L ₂exit, i.e. dotted line p left part in Fig. 2; The III section action of adaptive Current Protection element 1, fault may occur in L ₁, L ₂upper, or circuit L ₃exit, i.e. Fig. 2 dotted line q left part.

Definition adaptive Current Protection effectiveness degree α _ijwhile action for adaptive Current Protection element j, fault occurs in circuit L _ion probability, the relation quantification by adaptive Current Protection action situation with abort situation.This value has reflected the action of adaptive Current Protection element j, to judging circuit L _iwhether be the percentage contribution of faulty line.Below according to the position relationship between the I section of adaptive Current Protection element, II section and III section and faulty line, the effectiveness degree of the adaptive Current Protection of deriving respectively I section, II section and III section

The I section effectiveness degree of A, adaptive Current Protection.

The I section of adaptive Current Protection only reflects this line fault, when adaptive Current Protection element j is at faulty line L _iwhen upper, effectiveness degree is 1; When adaptive Current Protection element j is not at faulty line L _iwhen upper, effectiveness degree is 0.Can obtain thus adaptive Current Protection I section effectiveness degree

shown in (1):

The II section effectiveness degree of B, adaptive Current Protection.

The II section of adaptive Current Protection has reflected this circuit and adjacent lines exit fault.As shown in Figure 2, the protection range of the II section of adaptive Current Protection element 1 is dotted line p left part.The II section action of adaptive Current Protection element 1, fault may occur in L ₁upper, or L ₂upper dotted line p left part, protection range covers the part of circuit.The coverage of the II section that the part that this protection range is covered to each circuit is defined as adaptive Current Protection element 1 on each circuit.Consider that in electric power system, line impedance is directly proportional to line length, the equivalent impedance calculating formula of coverage is as follows:

$Z_{\mathrm{cLi}-j}^{\mathrm{II}}=\left\{\begin{array}{c}{Z}_{\mathrm{Li}}\\ \frac{K_d{E}_S}{I_{\mathrm{set}-j}^{\mathrm{II}}}-Z_S-Z_{\mathrm{Li}1}\end{array}\right.---\left(2\right)$

In formula (2),

for the II section setting value of adaptive Current Protection element j.When adaptive Current Protection element j is at circuit L _itime, the equivalent impedance of coverage is line impedance Z _li; Circuit L _i1for circuit L _ihigher level's circuit, Z _li1for circuit L _i1impedance.When adaptive Current Protection element j is at circuit L _i1when upper, at circuit L _ithe equivalent impedance of the coverage of upper generation is the line impedance of protection range cover part.

Take Fig. 2 as example, the II segment protect scope of protection component 1 is at L ₁, L ₂the equivalent impedance of the coverage of upper generation is respectively:

$\left\{\begin{array}{c}{Z}_{\mathrm{cL}1-1}^{\mathrm{II}}=Z_{L1}\\ Z_{\mathrm{cL}2-1}^{\mathrm{II}}=\frac{K_d{E}_s}{I_{\mathrm{set}-1}^{\mathrm{II}}}-Z_S-Z_{L1}\end{array}\right.---\left(3\right)$

for adaptive Current Protection element 1 is for circuit L ₁coverage equivalent impedance,

for adaptive Current Protection element 1 is for circuit L ₂coverage equivalent impedance.In the time that the II of adaptive Current Protection element 1 section is moved, fault may occur in L ₁, L ₂on probability be respectively the coverage of protection range on each circuit and account for the percentage of total coverage of protection range.By

further obtain the II section effectiveness degree of adaptive Current Protection

shown in (4):

${\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{II}}=\frac{Z_{\mathrm{cLi}-j}^{\mathrm{II}}}{\underset{n}{\overset{N}{\mathrm{\Σ}}}{Z}_{\mathrm{cLn}-j}^{\mathrm{II}}}---\left(4\right)$

In formula (4), n is the circuit number in the protection range of adaptive Current Protection j, and N is the number of lines in the protection range of adaptive Current Protection j.In Fig. 2, the circuit in the protection range of adaptive Current Protection element j is L ₁, L ₂l _n,

for adaptive Current Protection element j is at L ₁, L ₂l _non coverage equivalent impedance.

The III section effectiveness degree of C, adaptive Current Protection.

The III section of adaptive Current Protection can reflect the fault of this circuit and adjacent lines, and protection range can extend to adjacent secondary circuit.According to the above-mentioned definition to coverage equivalent impedance, the protection range of the III section of adaptive Current Protection is at circuit L _ithe equivalent impedance of the coverage of upper generation is:

$Z_{\mathrm{cLi}-j}^{\mathrm{III}}=\left\{\begin{array}{c}{Z}_{\mathrm{Li}}\\ \frac{K_d{E}_S}{I_{\mathrm{set}-j}^{\mathrm{III}}}-Z_S-Z_{\mathrm{Li}2}-Z_{\mathrm{Li}1}\end{array}\right.---\left(5\right)$

In formula (5), for the III section setting value of adaptive Current Protection element j; Circuit L _i1for circuit L _ihigher level's circuit, circuit L _i2for circuit L _i1higher level's circuit, when adaptive Current Protection element j is at circuit L _ior circuit L _i1when upper, coverage equivalent impedance is line impedance Z _li; When adaptive Current Protection element j is at circuit L _i2when upper, at circuit L _ithe equivalent impedance of the coverage of upper generation is the line impedance of protection range cover part.

Take Fig. 2 as example, the III segment protect scope of adaptive Current Protection element 1 is at circuit L ₁, L ₂the coverage equivalent impedance of upper generation is respectively Z _l1and Z _l2, at L ₃the coverage equivalent impedance of upper generation is:

$Z_{\mathrm{cL}3-1}^{\mathrm{III}}=\frac{K_d{E}_S}{I_{\mathrm{set}-1}^{\mathrm{III}}}-Z_S-Z_{L1}-Z_{L2}---\left(6\right)$

In the time that the III of adaptive Current Protection element 1 section is moved, fault may occur in L ₁, L ₂, L ₃on probability be respectively protection range coverage on each circuit and account for the percentage of the total coverage of protection range.By

further obtain adaptive Current Protection III section effectiveness degree

for:

${\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{III}}=\frac{Z_{\mathrm{cLi}-j}^{\mathrm{III}}}{\underset{n}{\overset{N}{\mathrm{\Σ}}}{Z}_{\mathrm{cLn}-j}^{\mathrm{III}}}---\left(7\right)$

In formula (7), n and N in the same formula of implication (4) of n and N.

Step 3: set up the collaborative degree of the protection function of each circuit, and calculate the protection system degree functional value of each circuit according to the collaborative degree of described protection function.

Adaptive Current Protection effectiveness degree for adaptive electro fluid element j action, fault occurs in circuit L _ion probability.Based on the above-mentioned analysis to syllogic adaptive Current Protection effectiveness degree, using adaptive Current Protection effectiveness degree as weight, protection action message is merged, build the collaborative degree of protection function E _f(L _i):

$E_F\left(L_i\right)=\underset{j}{\overset{B_I}{\mathrm{\Σ}}}{\mathrm{\α}}_{\mathrm{ij}}^I{C}_j^I+\underset{j}{\overset{B_{\mathrm{II}}}{\mathrm{\Σ}}}{\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{II}}{C}_j^{\mathrm{II}}+\underset{j}{\overset{B_{\mathrm{III}}}{\mathrm{\Σ}}}{\mathrm{\α}}_{\mathrm{ij}}^{\mathrm{III}}{C}_j^{\mathrm{III}}---\left(8\right)$

In formula (8),

for fault occur after I section, II section, the actual act situation of III section of adaptive Current Protection element j, B _i, B _iIand B _iIIfor the number of all adaptive Current Protection.

Above-mentioned formula (8) is the collaborative degree of the protection function of each circuit, can calculate every circuit L according to this formula _ithe collaborative degree of protection functional value.

Step 4: set up the collaborative degree of the protection expectation function of each circuit, and calculate the collaborative degree of the protection expectation function value of each circuit according to the collaborative degree of described protection expectation function.

Assumed fault occurs in circuit L _iwhen upper, protection component moved to situation desired value and carry out result of calculation after information fusion and be defined as the collaborative degree of protection expectation function.Break down at circuit diverse location, adaptive Current Protection element action situation difference therefore, need to be considered situation about breaking down at circuit diverse location in the time determining the desired value of protection component action situation.

Take the system in Fig. 3 as example, the protection range of the I section of adaptive Current Protection element CB2 and CB7 is respectively the oval part in Fig. 3, and two ellipses are by circuit L ₂be divided into tri-sections of A, B, C, circuit diverse location break down adaptive Current Protection I section action situation as shown in Figure 4.

The probability of fault point on tri-sections of A, B, C is respectively

calculating formula is as follows:

$\left\{\begin{array}{c}{\mathrm{\&beta;}}_A^I=\frac{Z_{L2\mathrm{<figure-callout\; id="2"\; label="A\; Z\; L"\; filenames="HDA0000471681560000021.png,HDA0000471681560000023.png"\; state="\{\{state\}\}">A</figure-callout>}}}{Z_L}\\ {\mathrm{\&beta;}}_B^I=\frac{Z_{L2\mathrm{<figure-callout\; id="2"\; label="B\; Z\; L"\; filenames="HDA0000471681560000021.png,HDA0000471681560000023.png"\; state="\{\{state\}\}">B</figure-callout>}}}{Z_L}\\ {\mathrm{\&beta;}}_C^I=\frac{Z_{L2C}}{Z_{L2}}\end{array}\right.---\left(9\right)$

The II segment protect scope of adaptive Current Protection element CB1, also can be by circuit L ₂be divided into two sections of A, B, as shown in Figure 5.At circuit L ₂diverse location break down adapt to current protection II section action situation as shown in Figure 6.

The protection range of the II section of adaptive Current Protection element CB1 is at circuit L ₂the upper coverage equivalent impedance producing respectively, can reflect the length of A section in Fig. 5, and the probability of fault point on two sections of A, B is respectively

calculating formula is as follows:

$\left\{\begin{array}{c}{\mathrm{\&beta;}}_A^{\mathrm{II}}=\frac{Z_{\mathrm{cL}2-1}^{\mathrm{<figure-callout\; id="2"\; label="II\; Z\; L"\; filenames="HDA0000471681560000021.png,HDA0000471681560000023.png"\; state="\{\{state\}\}">II</figure-callout>}}}{Z_L}\\ {\mathrm{\&beta;}}_B^{\mathrm{II}}=\frac{Z_{L2}-Z_{\mathrm{cL}2-1}^{\mathrm{II}}}{Z_{L2}}\end{array}\right.---\left(10\right)$

In like manner, the protection range of the III section of adaptive Current Protection element CB1, also can be by circuit L ₃be divided into two sections of A, B, as shown in Figure 7.At circuit L ₃diverse location break down adaptive Current Protection III section action situation as shown in Figure 8.

The III segment protect scope of adaptive Current Protection element CB1 is at circuit L ₃the upper coverage equivalent impedance producing respectively, can reflect the length of A section in Fig. 7, and the probability of fault point on two sections of A, B is respectively

shown in (11).

$\left\{\begin{array}{c}{\mathrm{\&beta;}}_A^{\mathrm{III}}=\frac{Z_{\mathrm{cL}3-1}^{\mathrm{<figure-callout\; id="3"\; label="III\; Z\; L"\; filenames="HDA0000471681560000014.png,HDA0000471681560000021.png"\; state="\{\{state\}\}">III</figure-callout>}}}{Z_L}\\ {\mathrm{\&beta;}}_B^{\mathrm{III}}=\frac{Z_{L3}-Z_{\mathrm{cL}3-1}^{\mathrm{III}}}{Z_{L3}}\end{array}\right.---\left(11\right)$

By β _tas fault point, when the circuit diverse location, the weight of protection action situation desired value, protects the desired value of action situation while obtaining line fault, and the expression formula of the collaborative degree of protection expectation function is:

$\begin{array}{c}{E}^{*}\left(L_i\right)=\underset{j}{\overset{B_I}{\mathrm{\&Sigma;}}}\left({\mathrm{\&alpha;}}_{\mathrm{ij}}^I\underset{t=A,B...}{\mathrm{\&Sigma;}}{\mathrm{\&beta;}}_t^I{C}_{t-\mathrm{ij}}^{*I}\right)+\\ \underset{j}{\overset{B_{\mathrm{II}}}{\mathrm{\&Sigma;}}}\left({\mathrm{\&alpha;}}_{\mathrm{ij}}^{\mathrm{II}}\underset{t=A,B...}{\mathrm{\&Sigma;}}{\mathrm{\&beta;}}_t^{\mathrm{II}}{C}_{t-\mathrm{ij}}^{*\mathrm{II}}\right)+\\ \underset{j}{\overset{B_{\mathrm{III}}}{\mathrm{\&Sigma;}}}\left({\mathrm{\&alpha;}}_{\mathrm{ij}}^{\mathrm{III}}\underset{t=A,B...}{\mathrm{\&Sigma;}}{\mathrm{\&beta;}}_t^{\mathrm{III}}{C}_{t-\mathrm{ij}}^{*\mathrm{III}}\right)\end{array}---\left(12\right)$

In formula (12),

for assumed fault occurs in circuit L _ia, B ... in section, the action situation desired value of each protection component; B _i, B _iIand B _iIIfor the number of all adaptive Current Protection.Formula (12) is the collaborative degree of the protection expectation function of each circuit, can calculate every circuit L according to this formula _ithe collaborative degree of protection expectation function value.

Step 5: the adaptive Current Protection cofactor that is compared to this circuit by the collaborative degree of the protection of every circuit functional value with the collaborative degree of protection expectation function value.

Circuit L _iadaptive Current Protection cofactor adopt formula calculate P _c(L _i) value of the collaborative degree of larger expression adaptive Current Protection function approaches the value of the collaborative degree of protection expectation function, circuit L _ithe probability that is faulty line is larger, and the adaptive Current Protection cofactor of faulty line should be one and approaches 1 positive number.

Step 6: determine the circuit of adaptive Current Protection cofactor value maximum in all circuits, the circuit of described adaptive Current Protection cofactor value maximum is faulty line.

The collaborative degree of the adaptive Current Protection factor of faulty line is the maximum of all circuit adaptive Current Protection cofactors in region, and error protection criterion is:

$P_{C\max }=\underset{1\&le;i\&le;M}{\mathrm{<figure-callout\; id="1"\; label="max"\; filenames="HDA0000471681560000014.png,HDA0000471681560000021.png"\; state="\{\{state\}\}">max</figure-callout>}}{P}_c\left(L_i\right)---\left(13\right)$

In formula (13), P _cmaxfor the maximum of region all circuit adaptive Current Protection cofactor, M is all number of lines in region, and the circuit of adaptive Current Protection cofactor value maximum is faulty line.

Embodiment 2

Adopt certain Tianjin 10.5KV power network neutral point isolated neutral system to carry out simulating, verifying.Network system figure as shown in Figure 9.The formation pattern of region backup protection system for damping adopts set of regions Chinese style (having main formula).Circuit L in this system ₁, L ₂, L ₅circuit types be overhead transmission line, circuit L ₃, L ₄, L ₆for cable line.Bus c place is connected to distributed power source (DG), and its rated power is 10MVA, adopts current mode PQ control mode.Due to the access of distributed power source, the circuit L of both end power supplying ₁, L ₂circuit two ends equal configuration phase formula adaptive Current Protection.Circuit L ₃, L ₄, L ₅, L ₆only in power end configuration phase formula adaptive Current Protection.

1. data acquisition module.

At circuit L ₃middle section occurs after two-phase metallic short circuit fault, and data acquisition module receives the setting value of each adaptive Current Protection and operating value as shown in figure 10.

2. the protection effectiveness degree module of adjusting.

Form the adaptive Current Protection effectiveness degree α of each adaptive Current Protection element for every circuit _ij, wherein adaptive Current Protection element is to circuit L ₃effectiveness degree as shown in figure 11.

3. the collaborative degree of protection function generation module.

Using adaptive Current Protection effectiveness degree as weight, according to the Output rusults of data acquisition module, the collaborative degree of each route protection of adjusting functional value.

4. collaborative degree expectation function generation module.

By adaptive Current Protection effectiveness degree α _ijas weight, desired value and the weight thereof of join protection action situation, calculate the collaborative degree of protection expectation function value.

5. Fault Identification module.

Protect collaborative degree functional value and the collaborative ratio of spending expectation function value of protection by calculating, obtain adaptive Current Protection cofactor.By same to the collaborative degree of each circuit adaptive Current Protection functional value, collaborative degree expectation function value and the cofactor Figure 12 that is shown in.

Result in Figure 12 shows, is protecting in the faultless situation of action message circuit L ₃adaptive Current Protection cofactor be one and approach 1 positive number, and be region maximum, meet protection criterion (13), therefore, be judged as L ₃faulty line, result as shown in figure 13.Simultaneously; (6, the circuit of district inclusion shown in Fig. 9 when Figure 13 has provided random 5 loss of learnings or mistake; total number of protection component is 8; the total bit of the protection action message obtaining is 24; there is 20% missing at random or mistake in the protection information in random 5 loss of learnings or misrepresentation region), the statistics mean value that emulation experiment is 100 times.

Result is presented at and exists in loss of learning and wrong situation, circuit L ₃still meet protection criterion (13).Visible this algorithm has higher reliability and fault-tolerance.

Embodiment 3

Utilize the power distribution network electric power system model of the IEEE33 node that electromagnetic transient simulation software PSCAD/EMTDC builds to carry out simulating, verifying, this system is single supply radiating system, a circuit breaker of every branch road head end configuration, and circuit breaker numbering is circuit number.System diagram and each element number thereof are as shown in figure 14.This region backup protection is set of regions Chinese style, and No. 33 Zhan Wei region main websites of transformer station are set, and is responsible for receiving the data that upload substation, each region, and carries out integrated decision-making.

1. data acquisition module.

At circuit L ₁₀end occurs after three-phase metallic earthing fault, and data acquisition module receives each adaptive Current Protection setting value and operating value as shown in figure 15.

2. the protection effectiveness degree module of adjusting.

Form the adaptive Current Protection effectiveness degree α of each adaptive Current Protection element for every circuit _ij, wherein adaptive Current Protection element is to circuit L ₁₀effectiveness degree as shown in figure 16.

3. the collaborative degree of protection function generation module.

Using adaptive Current Protection effectiveness degree as weight, according to the Output rusults of data acquisition module, the collaborative degree of each route protection of adjusting functional value.

4. collaborative degree expectation function generation module.

By adaptive Current Protection effectiveness degree α _ijas weight, desired value and the weight thereof of join protection action situation, calculate the collaborative degree of protection expectation function value.

5. Fault Identification module

Protect collaborative degree functional value and the collaborative ratio of spending expectation function value of protection by calculating, obtain adaptive Current Protection cofactor.By same to the collaborative degree of each circuit adaptive Current Protection functional value, collaborative degree expectation function value and the cofactor Figure 17 that is shown in.

Result in Figure 17 shows, is protecting in the faultless situation of action message circuit L ₁₀adaptive Current Protection cofactor be one and approach 1 positive number, and be region maximum, meet protection criterion (13), therefore, be judged as L ₁₀faulty line, result as shown in figure 18.Simultaneously; (32, the circuit of district inclusion shown in Figure 14 when Figure 18 has provided random 20 loss of learnings or mistake; total number of circuit breaker is 32; the total bit of the protection action message obtaining is 96; there is 21% missing at random or mistake in the protection information in random 20 loss of learnings or misrepresentation region), the statistics mean value that emulation experiment is 100 times.

Result is presented at and exists in loss of learning and wrong situation, circuit L ₁₀still meet protection criterion (13).Visible this algorithm has higher reliability and fault-tolerance.

As circuit L ₂₇there is A phase earth fault in head end.While obtaining protecting action message inerrancy, the simulation result of this algorithm; During with random 20 loss of learnings or mistake, the statistics mean value that emulation experiment is 100 times, with being shown in Figure 19.

In the faultless situation of protection action message, circuit L ₂₇adaptive Current Protection cofactor meet protection criterion (13), can obtain L ₂₇for faulty line.In 100 statistical experiment results of random 20 loss of learnings or mistake, circuit L ₂₇still meet protection criterion (13).Visible this algorithm is not subject to the impact of fault type.

The present invention is defined as adaptive Current Protection effectiveness degree by the adaptive Current Protection situation of moving to the percentage contribution of Fault Identification; and set it as weight structure protection collaborative degree function and protect collaborative degree expectation function; then; utilize the collaborative degree of protection function and the ratio of the collaborative degree of protection expectation function to obtain adaptive Current Protection cofactor, thus identification faulty line.Fault Identification principle clear thinking of the present invention, be subject to information asynchronous affect less, the variation of adaptive system operational mode, dissimilar fault is occurred circuit diverse location to all good recognition capability; In the case of the seniority top digit disappearance of adaptive Current Protection action message or wrong, still accurate failure judgement circuit.

The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (7)

1. the locality protection system based on adaptive Current Protection cofactor, is characterized in that described locality protection system comprises data acquisition module, protection effectiveness degree adjust module, the collaborative degree of protection function generation module, protection collaborative degree expectation function generation module and Fault Identification module;

Described data acquisition module is connected with adjust module and the collaborative function generation module of spending of protection of protection effectiveness degree respectively;

Described protection effectiveness degree is adjusted, and module is worked in coordination with degree function generation module with data acquisition module, protection respectively and the collaborative degree of protection expectation function generation module is connected;

The collaborative degree of described protection function generation module is connected with Fault Identification module with data acquisition module, the protection effectiveness degree module of adjusting respectively;

The collaborative degree of described protection expectation function generation module is connected with Fault Identification module with the protection effectiveness degree module of adjusting respectively;

Described Fault Identification module is connected with the collaborative degree of protection expectation function generation module with the collaborative degree of protection function generation module respectively;

Described data acquisition module is for gathering setting value and the protection action virtual condition of each adaptive Current Protection of protection zone, and the current setting of each adaptive guard collecting is sent to the protection effectiveness degree module of adjusting, each protection action virtual condition collecting is sent to the collaborative degree of protection function generation module;

Wherein, the setting value of adaptive Current Protection comprises I section setting value, the II section setting value of adaptive Current Protection and the III section setting value of adaptive Current Protection of adaptive Current Protection;

The virtual condition of adaptive Current Protection comprises I section virtual condition, the II section virtual condition of adaptive Current Protection and the III section virtual condition of adaptive Current Protection of adaptive Current Protection;

Virtual condition comprises operate condition and non-action state;

Described protection effectiveness degree is adjusted module for according to the setting value of each adaptive Current Protection, calculate the effectiveness degree of each adaptive Current Protection, then the effectiveness degree of each adaptive Current Protection is sent to the collaborative degree of protection function generation module and the collaborative degree of protection expectation function generation module; Wherein, the effectiveness degree of described each adaptive Current Protection comprises I section effectiveness degree, the II section effectiveness degree of each adaptive Current Protection and the III section effectiveness degree of each adaptive Current Protection of each adaptive Current Protection;

The collaborative degree of described protection function generation module is used for according to the effectiveness degree of the virtual condition of each adaptive Current Protection and each adaptive Current Protection, calculate the collaborative degree of the protection functional value of each circuit, the more collaborative degree of the protection of each circuit functional value is sent to Fault Identification module;

The collaborative degree of described protection expectation function generation module is worked in coordination with degree expectation function value for calculate the protection of each circuit according to the effectiveness degree of each adaptive Current Protection, the more collaborative degree of the protection of each circuit expectation function value is sent to Fault Identification module;

Described Fault Identification module is for working in coordination with degree expectation function value according to the protection of the protection of each circuit collaborative degree functional value and each circuit; calculate the adaptive Current Protection cofactor of each circuit, then according to the adaptive Current Protection cofactor identification faulty line of each circuit.

2. the locality protection method based on adaptive Current Protection cofactor, is characterized in that described locality protection method comprises:

Step 1: the setting value and the protection action virtual condition that gather each adaptive Current Protection in protection zone;

Wherein, the setting value of adaptive Current Protection comprises I section setting value, the II section setting value of adaptive Current Protection and the III section setting value of adaptive Current Protection of adaptive Current Protection;

The virtual condition of adaptive Current Protection comprises I section virtual condition, the II section virtual condition of adaptive Current Protection and the III section virtual condition of adaptive Current Protection of adaptive Current Protection;

Virtual condition comprises operate condition and non-action state;

Step 2: the effectiveness degree that calculates each adaptive Current Protection;

Step 3: the collaborative degree of the protection functional value that calculates each circuit;

Step 4: the collaborative degree of the protection expectation function value of calculating each circuit;

Step 5: the adaptive Current Protection cofactor that calculates each circuit;

Step 6: according to the adaptive Current Protection cofactor identification faulty line of each circuit.

3. locality protection method according to claim 2, is characterized in that the effectiveness degree of described each adaptive Current Protection of calculating is specially:

Adopt formula

calculate the I section of each adaptive Current Protection to circuit L _ieffectiveness degree;

Adopt formula

calculate the II section of each adaptive Current Protection to circuit L _ieffectiveness degree;

Wherein, for the II section of adaptive Current Protection j is for circuit L _icoverage equivalent impedance, and

Z _lifor circuit L _iimpedance;

Z _li1for circuit L _i1impedance and L _i1for L _ihigher level's circuit;

Z _sfor the comprehensive impedance of system power supply side;

for the setting value of the II section of adaptive Current Protection j;

K _dfor fault type coefficient;

E _sfor the equivalent phase electromotive force of system;

N is the circuit number in the protection range of adaptive Current Protection j;

N is the number of lines in the protection range of adaptive Current Protection j;

Adopt formula

calculate the III section of each adaptive Current Protection to circuit L _ieffectiveness degree;

Wherein,

for the III section of adaptive Current Protection j is for circuit L _icoverage equivalent impedance and

Z _li2for circuit L _i2impedance and L _i2for L _i1higher level's circuit;

for the setting value of the III section of adaptive Current Protection j.

4. locality protection method according to claim 3, is characterized in that the collaborative degree of the protection functional value of each circuit of described calculating adopts formula:

$E_F\left(L_i\right)=\underset{j}{\overset{B_I}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_{\mathrm{ij}}^I{C}_j^I+\underset{j}{\overset{B_{\mathrm{II}}}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_{\mathrm{ij}}^{\mathrm{II}}{C}_j^{\mathrm{II}}+\underset{j}{\overset{B_{\mathrm{III}}}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_{\mathrm{ij}}^{\mathrm{III}}{C}_j^{\mathrm{III}};$

Wherein, for the I section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the II section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the III section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the I section actual condition value of adaptive Current Protection j after fault generation;

for the II section actual condition value of adaptive Current Protection j after fault generation;

for the III section actual condition value of adaptive Current Protection j after fault generation;

In the time that virtual condition is operate condition, actual condition value gets 1; In the time that virtual condition is non-action state, actual condition value gets 0;

B _ifor the I hop count order of adaptive Current Protection;

B _iIfor the II hop count order of adaptive Current Protection;

B _iIIfor the III hop count order of adaptive Current Protection.

5. locality protection method according to claim 4, is characterized in that the collaborative degree of the protection expectation function value of calculating each circuit adopts formula:

$E^{*}\left(L_i\right)=\underset{j}{\overset{B_I}{\mathrm{\&Sigma;}}}\left({\mathrm{\&alpha;}}_{\mathrm{ij}}^I\underset{t=A,B...}{\mathrm{\&Sigma;}}{\mathrm{\&beta;}}_t^I{C}_{t-\mathrm{ij}}^{*I}\right)+\underset{j}{\overset{B_{\mathrm{II}}}{\mathrm{\&Sigma;}}}\left({\mathrm{\&alpha;}}_{\mathrm{ij}}^{\mathrm{II}}\underset{t=A,B....}{\mathrm{\&Sigma;}}{\mathrm{\&beta;}}_t^{\mathrm{II}}{C}_{t-\mathrm{ij}}^{*\mathrm{II}}\right)+\underset{j}{\overset{B_{\mathrm{III}}}{\mathrm{\&Sigma;}}}\left({\mathrm{\&alpha;}}_{\mathrm{ij}}^{\mathrm{III}}\underset{t=A,B...}{\mathrm{\&Sigma;}}{\mathrm{\&beta;}}_t^{\mathrm{III}}{C}_{t-\mathrm{ij}}^{\mathrm{III}}\right);$

Wherein, for the I section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the II section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for the III section of adaptive Current Protection j is to circuit L _ieffectiveness degree;

for faulty line within the scope of the I of adaptive Current Protection segment protect and fault point be positioned at the probability of faulty line t section;

for faulty line within the scope of the II of adaptive Current Protection segment protect and fault point be positioned at the probability of faulty line t section;

for faulty line within the scope of the III of adaptive Current Protection segment protect and fault point be positioned at the probability of faulty line t section;

for fault occurs in circuit L _it section on time adaptive Current Protection j the desired value of I section in operate condition;

for fault occurs in circuit L _it section on time adaptive Current Protection j the desired value of II section in operate condition;

for fault occurs in circuit L _it section on time adaptive Current Protection j the desired value of III section in operate condition;

T is a section in the protection range of I section, II section and the III section of adaptive Current Protection faulty line is divided into all sections;

B _ifor the I hop count order of adaptive Current Protection;

B _iIfor the II hop count order of adaptive Current Protection;

B _iIIfor the III hop count order of adaptive Current Protection.

6. locality protection method according to claim 5, is characterized in that the adaptive Current Protection cofactor of each circuit of described calculating adopts formula

Wherein, E _f(L _i) be circuit L _ithe collaborative degree of protection functional value;

E ^*(L _i) be circuit L _ithe collaborative degree of protection expectation function value.

7. locality protection method according to claim 6; it is characterized in that the described identification of the adaptive Current Protection cofactor according to each circuit faulty line is specially: determine the circuit of adaptive Current Protection cofactor value maximum in all circuits, the circuit of described adaptive Current Protection cofactor value maximum is faulty line.

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