CN104659779B - Method for selecting power exchange connection modes for sub-areas in power grid - Google Patents

Abstract

A method for selecting power exchange connection modes for sub-areas in a power grid comprises steps as follows: A, power grid parameters of a fault sub-area and an adjacent sub-area are acquired; B, power vacancy of the fault sub-area is determined; C, exchange power of all connecting lines in the fault sub-area is determined; D, whether a main transformer down channel of the fault sub-area is broken down is judged, if yes, one connecting line with the highest exchange power is closed to be taken as an exchange connecting channel, and otherwise, a buscouple switch is switched off to be taken as the exchange connecting channel; E, whether the power vacancy of the fault sub-area is met is judged, if yes, a step F is executed, and otherwise, a step G is executed; F, whether the exchange connecting channel is overloaded is judged, if yes, the step G is executed, and otherwise, the connecting way is selected; G, one connecting line is added as the exchange connecting channel, and the step E is executed. According to the method for selecting the power exchange connection modes for the sub-areas in the power grid, the effective power grid sub-area exchange ways can be provided, and the system stability is improved.

Description

Sub-area division mutually supplies contact information system of selection

Technical field

The present invention relates to Operation of Electric Systems field, it is related specifically to the troubleshooting in power system partitioned mode Technology.

Background technology

Under 500kv rack constantly development and perfect promotion, gradually formed major network is 500kv looped network to urban distribution network, Regional power grid is the net structure of 220kv electrical network.Meanwhile, 500/220kv high and low electromagnetic circle net and 220kv side system are short The problems such as road electric current increases increasingly highlights also with the continuous reinforcement of net connection, therefore, should advance implementation with 500kv Transformer station is the sub-area division operating mechanism of core.After forming rational subregion, can eliminate and have a strong impact on electricity net safety stable 500/220kv electromagnetic looped network, solves the instability problem of electromagnetic looped network, and can newly be set a small amount of monoblock of Large Copacity power plant It is directly accessed the 220kv electrical network being changed into power distribution network with regional power plant, using radiation rack supply electric power load, effectively reduce System short-circuit levels of current, simplifies relay protection and runs operation.

While bringing aforementioned advantages, the accident also weakening each subregion resists energy to the 220kv sub-area division method of operation Power.For this reason, it may be necessary to build between 220kv sub-area division mutually supply service channel, to ensure as partition source and hinge Power supply reliability in fault or maintenance time zone for the 500kv main transformer, not cutting load or cutting load less of trying one's best.

Various ways can be taken to carry out subregion due to by stages mutually to supply, for example take different mutually supply service channel, or Person is directly used 220kv side bus connection switch as mutually supplying service channel etc., so when the main transformer of certain subregion breaks down or overhauls When, how to determine that low cost, effective subregion mutually just become good problem to study for contact information.Subregion mutually supplies contact information Selection be directly connected to by stages Power Exchange and support level, the power delivery capabilities of impact by stages.Unreasonably select Select and mutually for contact information, the power-balance demand making electrical network under accident mode is not being met.However, in prior art Mutually supply the determination aspect of contact information not yet to have rational system of selection, make mutually for contact information selection exist diversity and with Meaning property, brings hidden danger to the safe operation of electrical network.

Content of the invention

In view of this, it is an object of the invention to overcoming the deficiencies in the prior art, provide a kind of sub-area division mutual For contact information system of selection, the selection mutually supplying contact information for sub-area division provides effective solution, to improve electrical network The safety and stability running.

In order to realize this purpose, the technical scheme that the present invention takes is as follows.

A kind of sub-area division mutually supplies contact information system of selection, the method comprising the steps of:

The electrical network parameter of a, acquisition fault subregion and adjacent sectors；

B, determine the power shortage of fault subregion；

C, determine all interconnections of fault subregion mutually supply power；

Send passage whether fault under d, failure judgement subregion main transformer, if fault, close and mutually supply prominent interconnection to make For mutually supplying service channel, otherwise closure bus connection switch is as mutually supplying service channel；

E, judge whether to meet fault division power vacancy, if meeting execution step f, otherwise execution step g；

Whether f, judgement mutually transship for service channel, if overload, execution step g, and otherwise select contact information；

G, increase interconnection as mutually supplying service channel, execution step e.

In step a, the electrical network parameter obtaining described fault subregion and adjacent sectors includes: obtains fault subregion and adjacent The equivalent impedance of subregion.

In addition in stepb, determine that the power shortage of fault subregion is:

Wherein p_lossThere is the power loss in subregion during main transformer n-2 fault for fault subregion,

x_sfAnd x_ssFor other normal main transformers in subregion to compensation point equivalent impedance.

In step c, determine that the mutual of all interconnections of fault subregion includes for power:

$p^{*}=\frac{1}{x_{\mathrm{\σ}}^{*}}\mathrm{\δ\δ},$

Wherein p^*For mutually supplying active power perunit value,

Mutually supply system equivalent impedance for contact,

δ δ is the phase angle change amount of fault subregion contact point.

Determine that contact mutually supplies system equivalent impedanceIncluding:

C1, determine that two subregions are respectively as follows: to the equivalent impedance of contact point

x₁=jx_aj^tAnd x₂=kx_bk^t,

Wherein x_a、x_bFor distinguishing the nodal impedance matrix of two subregions,

Tie up row vector for m, j point is position in subregion a for the contact point, m is total node of subregion a Number；

Tie up row vector for n, k point is position in subregion b for the contact point, n is total node of subregion b Number；

C2, the impedance according to service channel itself the and two subregions equivalent impedance to contact point, determines contact mutually for system The equivalent impedance of system.

In addition, determining that the phase angle change amount δ δ of fault subregion contact includes:

δ δ=x^*p_δ ^*,

Wherein x^*For the perunit value of fault partitioned nodes impedance matrix,

p_δ ^*Vector for node injecting power variable quantity perunit value composition each under fault.

Contact information system of selection is mutually supplied by the sub-area division using the present invention, after subregion being realized for electrical network, Mutually supply problem present in contact information selection it is proposed that by stages mutually supplies contact information system of selection in by stages, improve Supply Security and reliability that sub-area division runs.

Brief description

Fig. 1 is the schematic flow sheet that in the specific embodiment of the invention, sub-area division mutually supplies contact information system of selection.

Fig. 2 is partition power grid closure service channel equivalent circuit diagram in the specific embodiment of the invention.

Fig. 3 is prosperous city subregion and the adjacent sectors wiring diagram of one concrete application example of the present invention.

Specific embodiment

Below in conjunction with the accompanying drawings, the present invention is elaborated.

The detailed example embodiment of following discloses.However, concrete structure disclosed herein and function detail merely for the sake of The purpose of description example embodiment.

It should be appreciated, however, that the present invention is not limited to disclosed particular exemplary embodiment, but covers and fall into disclosure model All modifications in enclosing, equivalent and alternative.In the description to whole accompanying drawings, identical reference represents identical unit Part.

It will also be appreciated that term "and/or" as used in this include one or more correlations list any of item With all combinations.It will further be appreciated that when part or unit are referred to as " connection " or during " coupled " to another part or unit, it Can be directly connected or coupled to miscellaneous part or unit, or can also there is intermediate member or unit.Additionally, being used for describing Between part or unit other words of relation should understand in the same fashion (for example, " and between " to " directly between ", " adjacent " is to " direct neighbor " etc.).

In order to technical scheme is described, introduce the know-why of the present invention first.

In embodiments of the present invention, described fault partition area internal power vacancy refers to dependent power supply reliability Sub-area division, when there is 500kv main transformer n-2 failure condition, for meeting area internal power balance, connection is passed through in required adjacent sectors Network passage carries out the mutual power for supporting.

The described sub-area division with dependent power supply reliability refers to occur 500kv main transformer in 220kv sub-area division area During n-2 failure condition, still can meet own power balance it is ensured that reliable power supply is carried out to electric load it is not necessary to adjacent sectors Carry out mutually for supporting, then this subregion is the sub-area division with independently-powered reliability.Otherwise, as having that dependent powers can By the sub-area division of property, need adjacent sectors pass through service channel carry out mutual for support meet area's internal power balance it is ensured that its Safe and stable operation.

By simplest comprise two subregions in the way of the principle of technical scheme is described, but the application of the present invention Scope not limited to this, for example, can be generalized to the situation that there are multiple subregions.There are two subregion a and b, if b subregion is non-for having The sub-area division of independently-powered reliability, when b subregion occurs 500kv main transformer n-2 fault, needs adjacent sectors a to carry out mutually for propping up Help.If trouble point is f, then the b subregion internal fault point information matrix is had to be:

Tie up row vector for n, n is node total number.

Then fault lower node injecting power variable quantity is:

p_δ=f^t·p_loss(1)

Wherein, p_lossThere is the power loss in subregion during 500kv main transformer n-2 fault for fault subregion.

Fault subregion 500kv transformer station occur main transformer n-2 fault when, in area other 500kv main transformers by under send more work( Rate is to subtract intracell power loss, and as maintains itself 220kv busbar voltage phase angle constant as possible.Therefore, for a certain electrical network Subregion, after in area, certain 500kv power station occurs main transformer n-2 fault, if other 500kv station 220kv bus is located at subregion in subregion Middle s point, then compensating power is:

$p_{\mathrm{add}}^{*}=\frac{x_{\mathrm{sf}}^{*}}{x_{\mathrm{ss}}^{*}}\·p_{\mathrm{loss}}^{*}---\left(2\right)$

Therefore, fault division power vacancy is:

Wherein x_sfAnd x_ssFor other normal main transformers in subregion to compensation point equivalent impedance.

Described service channel mutually for power be for quantitative discussion difference the impact to service channel mutual confession power for the factor, need Carry out Simplified analysis to mutual for cyclization dot circuit, and introduce Thevenin's theorem to realize to the analytical calculation mutually supplying power.Subregion Electrical network closure service channel equivalent circuit diagram is as shown in Figure 2.

As shown in Fig. 2 during closure service channel, being equivalent to an impedance z in parallel between i and j node_td.If adopted 220kv interconnection as mutually supplying contact information, then z_tdFor line impedance；If made using 500kv main transformer 220kv side bus connection switch For mutually supplying contact information, then z_tdIt is zero.Partition power grid is z to the equivalent Thevenin's equivalence impedance of subregion contact point₀When, contact is mutually It is z=z for the total equivalent impedance of system₀+z_td=r_σ+jx_σ.Mutual with fault subregion supplies contact point voltageIt is with reference to phasor, If being s=p+jq by the power that mutually supplies mutually causing for contact point voltage landing, wherein:

$p=\frac{u_j{r}_{\mathrm{\σ}}(u_i\cos {\mathrm{\δ}}_{\mathrm{ij}}-u_j)+u_i{u}_j{x}_{\mathrm{\σ}}\sin {\mathrm{\δ}}_{\mathrm{ij}}}{r_{\mathrm{\σ}}^2+x_{\mathrm{\σ}}^2}---\left(4\right)$

$q=\frac{u_j{x}_{\mathrm{\σ}}(u_i\cos {\mathrm{\δ}}_{\mathrm{ij}}-u_j)+u_i{u}_j{r}_{\mathrm{\σ}}\sin {\mathrm{\δ}}_{\mathrm{ij}}}{r_{\mathrm{\σ}}^2+x_{\mathrm{\σ}}^2}$

According to scheduling operation code, close service channel carry out mutually supplying front, two subregions mutually supply contact point voltage amplitude value difference Poor with generator rotor angle should control respectively within 5% and 15 °, that is, | δ_ij| 15 ° of ＜, there is r again_σ＜ ＜ x_σ, therefore meet approximate condition cos δ_ij≈1,sinδ_ij≈δ_ij.Therefore have:

$p=\frac{u_i{u}_j}{x_{\mathrm{\σ}}}{\mathrm{\δ}}_{\mathrm{ij}}---\left(5\right)$

$q=\frac{u_i-u_j}{x_{\mathrm{\σ}}}{u}_j---\left(6\right)$

Mutually it is compared with reactive power for active power, had:

$\frac{p}{q}=\frac{u_i}{u_i-u_j}{\mathrm{\δ}}_{\mathrm{ij}}---\left(7\right)$

Due to mutually supplying service channel to be located at 220kv electrical network, required according to Loop Closing Operation, before cyclization, voltage amplitude value difference controls Within 5%, therefore | u_i-u_j|≤11kv；And | δ_ij| 15 ° of ＜ (0.262rad), then according to formula (7), active closed loop power flow big Little for idle closed loop power flow 4～6 times, therefore mutually supply reactive power q less on mutually supplying power s impact, mutually supply power s and be mutually provided with Work(power p substantially close to.

To mutually supplying active power, before closure service channel, need for the mutual of two subregions to supply contact point voltage amplitude value difference Control within 5%, and voltage magnitude is mainly affected by reactive power equilibrium, and the latter is suitable for layering in-situ balancing principle, because This is it is believed that the mutual of two subregions all operates near rated voltage for contact point voltage, and has subregion contact point phase angle difference approximate For fault subregion contact point phase angle change amount.Therefore using what perunit value represented for active power be mutually:

$p^{*}=\frac{1}{x_{\mathrm{\σ}}^{*}}\mathrm{\δ\δ}---\left(8\right)$

Described contact mutually supplies the equivalent impedance of system and is mutually inversely proportional to for active power, mutually supplies active power for calculating, head First calculate the equivalent impedance that contact mutually supplies system.

Introduce partition power grid nodal impedance matrix, with the network equation that nodal impedance matrix z represents be:

zi_b=u_b(9)

z_iiCharacterize the equivalent impedance parameter of partition power grid, according to its physical significance, it is that from node i is seen into subregion The equivalent impedance arriving, that is, the equivalent impedance to i-node for the partition power grid, and have | z_ii|≥|z_ij|.

If two adjacent sectors are respectively a subregion and b subregion in partition power grid.Wherein, a subregion has m node, divides with b Interval contact point is j point therein；B subregion has n node, and the contact point with a by stages is k point therein.

Then get in touch with and mutually supply the contact dot matrix of two subregions to be respectively as follows:

A subregion:Tie up row vector for m；

B subregion:Tie up row vector for n.

If the nodal impedance matrix of a, b subregion is respectively x_a、x_b, then a, b subregion the equivalent impedance of contact point is respectively as follows:

A subregion:

x₁=x_jj=jx_aj^t(10)

B subregion:

x₂=x_kk=kx_bk^t(11)

Impedance x in conjunction with service channel itself_td, you can try to achieve the equivalent impedance x that contact mutually supplies system_σ.

Described fault subregion contact point phase angle change amount is directly proportional for active power to mutually, mutually supplies active power for calculating, Also need calculating fault subregion mutually supplies contact point phase angle change amount.

Two node i in partition power grid s, between j, the polar form of branch power equation is:

$p_{\mathrm{ij}}=u_i^2{g}_{\mathrm{ii}}+u_i{u}_j(g_{\mathrm{ij}}\cos {\mathrm{\δ}}_{\mathrm{ij}}+b_{\mathrm{ij}}\sin {\mathrm{\δ}}_{\mathrm{ij}})---\left(12\right)$

Wherein, g_ij、b_ijFor coherent element in partitioned nodes admittance battle array.Therefore, have:

$g_{\mathrm{ij}}+j{b}_{\mathrm{ij}}=-\frac{1}{r_{\mathrm{ij}}+j{x}_{\mathrm{ij}}}=\frac{-r_{\mathrm{ij}}}{r_{\mathrm{ij}}^2+x_{\mathrm{ij}}^2}+j\frac{x_{\mathrm{ij}}}{r_{\mathrm{ij}}^2+x_{\mathrm{ij}}^2}---\left(13\right)$

For high-voltage transmission network, line reactance value is much larger than resistance value.Therefore have | g_ij| ＜ ＜ | b_ij|, sin δ_ij≈δ_ij, cosδ_ij≈ 1, only considers branch road ij, then g_ii=-g_ij, b_ii=-b_ij.So that

$p_{\mathrm{ij}}^{*}=b_{\mathrm{ij}}^{*}{\mathrm{\δ}}_{\mathrm{ij}}=\frac{{\mathrm{\δ}}_{\mathrm{ij}}}{x_{\mathrm{ij}}^{*}}---\left(14\right)$

Due to node active power with and the power summation that flows through of its relevant branch road equal, that is,And save Point impedance matrix and bus admittance matrix inverse matrix each other, so that

δ=(b^-1)^*p^*=x^*p^*(15)

Therefore, under fault, partitioned nodes phase angle change amount vector is:

δ δ=x^*p_δ ^*(16)

Therefore to aforementioned a, b subregion, the contact point phase angle change amount of fault subregion b is represented by:

$\mathrm{\δ\δ}={\mathrm{kx}}_b^{*}{p}_{\mathrm{\δ}}^{*}---\left(17\right)$

Therefore, as shown in figure 1, in embodiment of the present invention sub-area division mutually include following step for contact information system of selection Rapid:

The electrical network parameter of a, acquisition fault subregion and adjacent sectors；

B, determine the power shortage of fault subregion；

C, determine all interconnections of fault subregion mutually supply power；

Send passage whether fault under d, failure judgement subregion main transformer, if fault, close and mutually supply prominent interconnection to make For mutually supplying service channel, otherwise closure bus connection switch is as mutually supplying service channel；

E, judge whether to meet fault division power vacancy, if meeting execution step f, otherwise execution step g；

Whether f, judgement mutually transship for service channel, if overload, execution step g, and otherwise select contact information；

G, increase interconnection as mutually supplying service channel, execution step e.

Therefore, most economical, effective side mutually can be taken for contact information system of selection using the sub-area division of the present invention Formula reaches the interval mutually confession of electrical network.

Wherein, obtain described fault subregion and the electrical network parameter of adjacent sectors includes: obtain fault subregion and adjacent sectors Equivalent impedance.

In addition, according to Such analysis, determining that the power shortage of fault subregion is:

Wherein p_lossThere is the power loss in subregion during main transformer fault for fault subregion,

x_sfAnd x_ssFor other normal main transformer compensation point equivalent impedances in subregion.

And determine that the mutual of all interconnections of fault subregion includes for power:

$p^{*}=\frac{1}{x_{\mathrm{\σ}}^{*}}\mathrm{\δ\δ},$

Wherein p^*For mutually supplying active power perunit value,

Mutually supply system equivalent impedance for contact,

The phase angle change amount that δ δ gets in touch with for fault subregion.

Wherein it is determined that contact mutually supplies system equivalent impedanceIncluding:

C1, determine that two subregions are respectively as follows: to the equivalent impedance of contact point

x₁=jx_aj^tAnd x₂=kx_bk^t,

Wherein x_a、x_bFor distinguishing the nodal impedance matrix of two subregions,

Tie up row vector for m, j point is position in subregion a for the contact point, m is total node of subregion a Number；

Tie up row vector for n, k point is position in subregion b for the contact point, n is total node of subregion b Number；

C2, the impedance according to service channel itself the and two subregions equivalent impedance to contact point, determines contact mutually for system The equivalent impedance of system.

And determine that the phase angle change amount δ δ of fault subregion contact includes:

δ δ=x^*p_δ ^*,

Wherein x^*For the perunit value of fault partitioned nodes impedance matrix,

p_δ ^*Vector for node injecting power variable quantity perunit value composition each under fault.

The technique effect of the present invention to be described below by way of a specific example, those skilled in that art it will be appreciated that Described specific example is only exemplary, and itself can not be construed as limiting the invention.

The circuit topology figure of described example is as shown in figure 3, it, calculates and verify this taking Beijing planning electrical network in 2015 as a example Bright sub-area division mutually supplies the feasibility of method and flow process.Through bpa calculate analysis understand that prosperous city subregion has that dependent powers can By needing other subregions to carry out mutually for supporting under property, fault.Fig. 3 is prosperous city subregion and adjacent sectors wiring diagram, and prosperous city subregion occurs After 2#, 3# main transformer n-2 fault of 500kv Changping, carried out mutually for supporting along towards subregion by adjacent city.Dividing according to the present invention below Area mutually supplies the flow process of contact information system of selection, carries out the selection that subregion mutually supplies contact information.

Step 1: obtain fault subregion and adjacent sectors electrical network parameter.

If providing power to support by adjacent city along towards subregion after fault.According to city along towards subregion and prosperous city partition power grid ginseng Number, can obtain related equivalent impedance data.

City is along towards subregion equivalent impedance x₁=3.65 ω, prosperous city subregion equivalent impedance x₂=x_ff=2.71 ω, prosperous city subregion Interior normal main transformer 500kv north of the city 2# becomes compensation point equivalent impedance x_ss=3.96 ω, x_sf=2.30 ω.220kv Changping=Huairou is double Return x_td1=0.82 ω, x_kf1=2.45 ω, the Qi Jia village=future city double back x_td2=0.80 ω, x_kf2=2.15 ω.

Step 2: calculate fault division power vacancy.

According to 500kv main transformer capacity in the partition area of fault Qian Chang city and loading condition it is known that division power penalty values are p_loss=808.53mw.In the subregion of prosperous city, the normal main transformer that runs carries out power compensating value for p under fault_add=469.60mw.Therefore Under fault, power shortage is p_Lack=p_loss-p_add=338.93mw.

Step 3: contact information is mutually supplied using alternating current circuit.

Select during the port of alternating current circuit, to make itself and bus connection switch port have close port equivalent impedance, with this understanding Determine that the sub-area division based on equivalent impedance mutually supplies the validity of contact information system of selection.

Analyze by contrast, choose elm Guan Ying, Nangyuan District is alternating current circuit contact information two ends website, calculates this port system etc. Value impedance.Before cyclization, elm Guan Ying, Nangyuan District 220kv busbar voltage amplitude, phase angle difference are as shown in table 1.

Table 1 cyclization front alternating current circuit port busbar voltage amplitude, phase angle difference

For calculating port equivalent impedance, first in simulation calculation, setting elm Guan Ying Nangyuan District alternating current circuit impedance is zero, After closure elm Guan Ying Nangyuan District double back 220kv AC line, obtain active closed loop power flow:

δp₀=890.2mw,

This active closed loop power flow is with to make closed loop power flow during contact information using bus connection switch of substantially equal.

Understand, to elm Guan Ying Nangyuan District double back 220kv alternating current circuit port, its port equivalent impedance is according to formula (10):

Therefore, alternating current circuit port is basically identical with bus connection switch port equivalent impedance.

According to wiring relation it is known that elm Guan Ying Nangyuan District double back AC line reactance value:

x_kk2=7.27 ω,

Contact line impedence is close with port equivalent impedance.Therefore, according to the sub-area division based on equivalent impedance mutually for contact Mode system of selection, should select alternating current circuit to make contact information, and now the active closed loop power flow of interconnection mode is less.

Calculate through bpa, after the double loop of closure elm Guan Ying Nangyuan District, active closed loop power flow:

δp₂=462.4mw,

It can be seen that, should in the case of, do active closed loop power flow during contact information using alternating current circuit and be significantly less than adopting mother Respective value during contact information made by switch.The sub-area division that therefore present invention provides mutually supplies contact information system of selection effective.

Above-mentioned example analysis shows: this method overcome existing mutual confession contact information system of selection lack clearly according to According to, therefore there is a problem of diversity with random.Sub-area division in embodiment of the present invention mutually supplies contact information selecting party Method is based on principle of stacking, introduces service channel port equivalent impedance, the active of closed loop power flow and reactive component are decoupled, and Grid condition according to residing for service channel, involutive ring trend carries out Simplified analysis, equivalent according to contact line impedence and access port The magnitude relationship of impedance is it is proposed that the subregion under different system equivalent impedance mutually supplies contact information system of selection, for mutual for contact Way choice provides clear and definite, rational foundation, the therefore stability of the system of raising.

It should be noted that above-mentioned embodiment is only the present invention preferably embodiment it is impossible to be understood as to this The restriction of invention protection domain, under the premise of without departing from present inventive concept, any minor variations that the present invention is done and modification Belong to protection scope of the present invention.

Claims (5)

1. a kind of sub-area division mutually supplies contact information system of selection, the method comprising the steps of:

The electrical network parameter of a, acquisition fault subregion and adjacent sectors；

B, determine the power shortage of fault subregion；

C, determine all interconnections of fault subregion mutually supply power；

Send passage whether fault under d, failure judgement subregion main transformer, if fault, close and mutually supply prominent interconnection as mutual For service channel, otherwise closure bus connection switch is as mutually supplying service channel；

E, judge whether to meet fault division power vacancy, if meeting execution step f, otherwise execution step g；

Whether f, judgement mutually transship for service channel, if overload, execution step g, and otherwise select contact information；

G, increase interconnection as mutually supplying service channel, execution step e；

In step b, determine that the power shortage of fault subregion is:

Wherein p_lossThere is the power loss in subregion during main transformer n-2 fault for fault subregion,

x_sfAnd x_ssFor other normal main transformers in subregion to compensation point equivalent impedance.

2. the sub-area division according to claim 1 mutually supplies contact information system of selection it is characterised in that in step a, obtaining Described fault subregion and the electrical network parameter of adjacent sectors is taken to include: to obtain the equivalent impedance of fault subregion and adjacent sectors.

3. the sub-area division according to claim 1 mutually supplies contact information system of selection it is characterised in that in step c, really Determine mutually including for power of all interconnections of fault subregion:

$p^{*}=\frac{1}{x_{\mathrm{\σ}}^{*}}\mathrm{\δ}\mathrm{\δ},$

Wherein p^*For mutually supplying active power perunit value,

Mutually supply system equivalent impedance for contact,

δ δ is the phase angle change amount of fault subregion contact point.

4. the sub-area division according to claim 3 mutually supplies contact information system of selection it is characterised in that determining contact mutually For system equivalent impedanceIncluding:

C1, determine that two subregions are respectively as follows: to the equivalent impedance of contact point

x₁=jx_aj^tAnd x₂=kx_bk^t,

Wherein x_a、x_bFor distinguishing the nodal impedance matrix of two subregions,

Tie up row vector for m, j point is position in subregion a for the contact point, m is total nodes of subregion a；

Tie up row vector for n, k point is position in subregion b for the contact point, n is total nodes of subregion b；

C2, the impedance according to service channel itself the and two subregions equivalent impedance to contact point, determines that contact mutually supplies system Equivalent impedance.

5. the sub-area division according to claim 3 mutually supplies contact information system of selection it is characterised in that determining that fault is divided The phase angle change amount δ δ of area's contact includes:

δ δ=x^*p_δ ^*,

Wherein x^*For the perunit value of fault partitioned nodes impedance matrix,

p_δ ^*Vector for node injecting power variable quantity perunit value composition each under fault.