CN103116807B - A kind of functional areas power distribution network becomes more meticulous planing method - Google Patents

Abstract

The present invention relates to a kind of functional areas power distribution network to become more meticulous planing method, its technical characteristics is: comprise the following steps: step 1: by the data of collecting function district Net Frame of Electric Network, load and growth requirement, determine the capacity of high voltage substation, position and service area; Step 2: carry out functional areas high-voltage distribution network planning; Step 3: carry out functional areas MV distribution systems and to become more meticulous planning, specifically comprise step 3.1: the typical interconnect architecture setting up high voltage substation group on a small scale; Step 3.2: layout and service area in conjunction with high voltage substation, constructing function district electricity grid substation interconnect architecture; Step 3.3: pressure network frame scheme in constructing function district electrical network; Step 3.4: press feeder line to get in touch with situation in calculating, provide the wiring of middle pressure network frame.The present invention is reasonable in design, for the power distribution network planning that becomes more meticulous in functional areas provides scientific basis, have reasonable in design, reliability is high, save construction cost and be convenient to the features such as maintenance.

Description

A kind of functional areas power distribution network becomes more meticulous planing method

Technical field

The invention belongs to distribution network technical field, especially a kind of functional areas power distribution network becomes more meticulous planing method.

Background technology

Urban distribution network refers in city scope as it provides and distribute the general name of electric power networks.Urban distribution network is the important component part of electric system, is again the load center of electric system, has that power consumption is large, load density is high, safe and reliable and power supply quality requirement high.One of important infrastructure that urban distribution network or urban modernization are built, the economy that it is built, transform and run and security had both affected the economic benefit of whole power department and the power supply quality of vast power consumer, had influence on again the normal performance of urban whole function.According to electric pressure and the difference that plays a role in power supply process thereof, urban distribution network can be divided into power transmission network (220kV and more than), high voltage distribution network (110kV and 35kV), medium voltage distribution network (20kV and 10kV) and low-voltage network (380/220V) etc. usually, comprises for they provide transformation facility and the power generating equipment of power supply simultaneously.

It can thus be appreciated that urban power distribution network is the main body of urban distribution network.Electrical network is the important step of electric energy transmitting in electric system, is the important leverage effectively utilizing electric energy.Power distribution network is last ring that user is arrived in electric system, and the relation of it and user is the tightst, also direct on the impact of customer power supply reliability and power supply quality.In some Main Developed Countries, the proportion of electric grid investment in electric power gross investment is general all higher than 50%, and power distribution network investment is not less than power transmission network investment.And in China, due to the situation of formed for a long time " retransmit, gently supply, don't work ", distribution network construction is in the state of under-capitalization always.Before late 1990s, the ratio between investments of China's generating, transmission of electricity, distribution is approximately 1:0.21:0.12.Therefore, result in China's generating, transmission of electricity, distribution development coordination not, power plant has electricity can not send, user need again less than, and the loss of electrical network is high, voltage is low, it is unreliable to power, the ability of mishap and disaster of resisting is weak, therefore, the structure of electrical network especially power distribution network weakness has become the bottleneck of electric system for electricity consumption.

In recent years, along with deeply carrying out of Electric Power Network Planning work, power distribution network facility progressively perfects, and distribution net work structure is tending towards reasonable, and there has been considerable leap the aspect such as power supply reliability, the quality of power supply, power supply economics of power distribution network.And along with the development of society, city planning is tending towards compartmentalization, and city function significantly promotes, the change of town and country looks development essence, the international modernization general layout shown unique characteristics basically forms.The center of gravity of city planning is gradually to the transfer of city function section planning, and urban distribution network planning also requires to shift to functional areas Electric Power Network Planning.Electrical network usual scale in functional areas is less, the electric pressure related to and planning center of gravity mainly concentrate in the design of middle pressure network frame, and the planning that becomes more meticulous how carrying out middle-voltage network for limited area, distinct characteristics, the fritter urban power distribution network that possesses certain directive property function is problem in the urgent need to address at present.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, provide a kind of functional areas power distribution network reasonable in design, that reliability is high to become more meticulous planing method.

The present invention solves its technical matters and takes following technical scheme to realize:

A kind of functional areas power distribution network becomes more meticulous planing method, comprises the following steps:

Step 1: by the data of collecting function district Net Frame of Electric Network, load and growth requirement, determine the capacity of high voltage substation, position and service area;

Step 2: carry out functional areas high-voltage distribution network planning;

Step 3: carry out functional areas MV distribution systems and to become more meticulous planning, specifically comprise the following steps:

Step 3.1: the typical interconnect architecture setting up high voltage substation group on a small scale;

Step 3.2: layout and service area in conjunction with high voltage substation, constructing function district electricity grid substation interconnect architecture; The method of described constructing function district electricity grid substation interconnect architecture is:

Step 3.2.1: transformer station in functional areas is set up structure interconnected between two, successively all the other transformer stations is traveled through to Mei Zuo transformer station and set up interconnecting relation;

Step 3.2.2: delete unreasonable interconnecting relation according to deletion principle, is formed and forms blank contact interconnect architecture by reasonable interconnecting relation;

Step 3.2.3: according to the typical interconnect architecture of small-scale high voltage substation group, by increasing or deleting a small amount of interconnecting relation, is configured to the typical structure the most close with it by transformer station's blank contact interconnect architecture in functional areas;

Step 3.3: pressure network frame scheme in constructing function district electrical network;

Step 3.4: press feeder line to get in touch with situation in calculating, provide the wiring of middle pressure network frame.

And the method that described step 2 carries out functional areas high-voltage distribution network planning is: the Connection Mode of employing and main wiring mode, set up the power supply of distribution substation in simple functional areas high pressure rack, planning function district.

And described deletion principle is:

Delete principle 1: delete the transformer station's interconnecting relation crossing over natural or artificial geographical barriers;

Delete principle 2: delete and exceed critical distance transformer station interconnecting relation;

Delete principle 3: ensure that the interconnected transformer station sum of final arbitrary transformer station is no more than 4, if the interconnected transformer station number of certain transformer station exceeds, according to contact distance from big to small delete the interconnecting relation exceeded in turn.

Advantage of the present invention and good effect are:

The present invention is reasonable in design, it is after carrying out the analysis of addressing constant volume to high voltage substation, according to the simple feature of functional areas electric network composition, utilize typical model theory to carry out High-Voltage Network framework to build and build with high voltage substation interconnect architecture, the security of typical model from operation of power networks or the economy from equipment utilization all has preferably character, makes functional areas electrical network overall architecture be structured on higher basis; Pressure network frame contact scheme in proposing before middle pressure network frame wiring, middle pressure network frame contact scheme fully takes into account the performance of functional areas mains supply ability, for the power distribution network planning that becomes more meticulous in functional areas provides scientific basis, have reasonable in design, reliability is high, save construction cost and be convenient to the features such as maintenance.

Accompanying drawing explanation

Fig. 1 is process flow diagram of the present invention;

Fig. 2 is the typical interconnect architecture schematic diagram of high voltage substation group on a small scale;

Fig. 3 is the structure process flow diagram of functional areas electricity grid substation interconnect architecture;

Fig. 4 is the main transformer contact structural representation of interconnected transformer station;

Fig. 5 is the addressing result schematic diagram of certain functional areas electricity grid substation;

Fig. 6 is the planning schematic diagram of certain functional areas high pressure rack;

Fig. 7 is the interconnect architecture schematic diagram of certain functional areas high voltage substation;

Fig. 8 is the planning schematic diagram of pressure network frame in certain functional areas.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further described.

A kind of functional areas power distribution network becomes more meticulous planing method, as shown in Figure 1, comprises the following steps:

Step 1: by the data of collecting function district Net Frame of Electric Network, load and growth requirement, determine the capacity of high voltage substation, position and service area, the power distribution network planning that becomes more meticulous in functional areas to put before this and carries out;

Step 2: carry out functional areas high-voltage distribution network planning;

According to the requirement of reliability, adopt Connection Mode and main wiring mode, set up simple functional areas high pressure rack, the power supply of the distribution substation in planning function district, to establish in functional areas pressure network frame in transformer station and to become more meticulous the basis of planning;

Step 3: carry out functional areas MV distribution systems and to become more meticulous planning:

Because functional areas electrical network scale is less, the planning that becomes more meticulous can be carried out, with the economy of the security and equipment utilization that ensure operation of power networks for the relatively simple middle pressure network frame of structure.The MV distribution systems planning step that becomes more meticulous is as follows:

Step 3.1: the typical interconnect architecture setting up high voltage substation group on a small scale, as the reference of high voltage substation interconnect scheme;

In this step, the typical interconnect architecture of small-scale high voltage substation group as shown in Figure 2.The small distribution network of functional areas can apply mechanically typical interconnect architecture construction, and typical interconnect architecture process proves the security from operation of power networks or the economy from equipment utilization all has preferably character.

Step 3.2: layout and service area in conjunction with high voltage substation, constructing function district electricity grid substation interconnect architecture, as shown in Figure 3, the method for constructing function district electricity grid substation interconnect architecture is:

Step 3.2.1: the complete interconnect scheme building transformer station in functional areas, namely transformer station in functional areas is set up structure interconnected between two, successively all the other transformer stations traveled through to Mei Zuo transformer station and set up interconnecting relation, if be total to n seat transformer station in functional areas, Cn2 interconnecting relation should be formed after this step, such interconnect architecture is called and gets in touch with interconnect architecture completely;

Step 3.2.2: getting in touch with on the basis of interconnect architecture completely, unreasonable interconnecting relation is deleted according to some criterion, form the interconnect architecture be made up of reasonable interconnecting relation, such model is called blank contact interconnect architecture, deletes that the principle of interconnecting relation mainly builds around geographic factor restriction, the restriction turned for distance limit and transformer station's degree;

In this step, delete that transformer station's interconnecting relation is the main part that functional areas electricity grid substation interconnect architecture builds.Delete that interconnecting relation carries out successively according to following principle:

Delete principle 1: unless there are special requirement, otherwise delete the transformer station's interconnecting relation crossing over natural or artificial geographical barriers.Geographical barriers mainly contains rivers, massif, some special scenic spot etc., crosses over similar barrier and may cause the problems such as the comparatively large or engineering cost of difficulty of construction is higher, should avoid as far as possible.

Delete principle 2: unless there are special requirement, otherwise deletion exceedes critical distance transformer station interconnecting relation, critical distance value is chosen as follows, if draft interconnected use overhead transmission line or overground cable hybrid power supply, then interconnected critical distance is 4.03km; If draft the pure cable line of interconnected use, then interconnected critical distance is 9.16km, critical distance with fault turn for time feeder line terminal voltage qualified for according to and take into account certain buckling factor and calculate and obtain.

Delete principle 3: ensure that the interconnected transformer station sum of final arbitrary transformer station is no more than 4, in order to there be the leeway of adjustment when ensureing that blank structure is drawn close to typical structure in step (3.2.3), here interconnected transformer station number preferably controls below 3, if the interconnected transformer station number of certain transformer station exceeds, according to contact distance from big to small delete the interconnecting relation exceeded in turn.Can prove interconnected transformer station number more than 4 after, the number of interconnection continues to promote the facilitation of the number of interconnection to power distribution network performance and weakens rapidly.

By above-mentioned steps, construct functional areas electricity grid substation interconnect architecture.

Step 3.2.3: on blank contact interconnect architecture basis, according to the typical interconnect architecture of small-scale high voltage substation group, by increasing or deleting a small amount of interconnecting relation, transformer station's blank contact interconnect architecture in functional areas is configured to the typical structure the most close with it, blank construction for electricity why is wanted to draw close to typical structure, because through computational analysis discovery no matter from the security of powering, plant factor angle, or from economy, simple operation angle, typical structure all can reach the level comparatively optimized.

Step 3.3: to give full play to functional areas power distribution network power supply capacity for target, pressure network frame scheme in constructing function district electrical network, in constructing function district electrical network, the concrete grammar of pressure network frame is:

In order to play the simple characteristic of functional areas dispatching of power netwoks, all adopt following connection form between the transformer station that there is interconnecting relation in step (3.2): any main transformer of transformer station is only got in touch with mutually with a wherein main transformer at offside station.Connection form is as Fig. 4.And concrete needs how many feeder lines are got in touch with mutually between two main transformers, determined by calculating below:

Step 3.3.1: extract main transformer communication relationship matrix:

Have n seat transformer station in functional areas, to i-th station jth main transformer renumber into and will be labeled as N _{i Σ}, then the numbering of i-th station jth platform main transformer is designated as (N _{(i-1) Σ}+ j), get the total number of units of main transformer for presentation function district, the corresponding main transformer capacity size of No. i-th is R _i;

Provide main transformer communication relationship matrix L _link:

$L_{link}=\left[\begin{array}{ccccc}{L}_{1,1}& ...& L_{1,i}& ...& L_{1,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& ...& .& ...& .\\ .& & .& & .\\ L_{i,1}& ...& L_{i,i}& ...& L_{i,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& ...& .& ...& .\\ .& & .& & .\\ L_{N_{\mathrm{\Σ}},1}& ...& L_{N_{\mathrm{\Σ}},i}& ...& L_{N_{\mathrm{\Σ}},N_{\mathrm{\Σ}}}\end{array}\right]$

Wherein L _i,jrepresent i-th main transformer and jth platform main transformer communication relationship (i=1,2,3 ..., N _Σ; J=1,2,3 ..., N _Σ), have during communication relationship and get L _i,j=1, otherwise L _i,j=0.And there is communication relationship, i.e. L between supposition main transformer and self _i,i=1;

Step 3.3.2: analyze contact unit power supply capacity:

In main transformer communication relationship matrix, by the main transformer maximum load situation having communication relationship with i-th main transformer can be determined in the i-th row vector, the contact unit maximum load rate matrix that represents of matrix definable following formula according to this:

$T=\left[\begin{array}{ccccc}{T}_{1,1}& ...& T_{1,i}& ...& T_{1,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& ...& .& ...& .\\ .& & .& & .\\ T_{i,1}& ...& T_{i,i}& ...& T_{i,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& ...& .& ...& .\\ .& & .& & .\\ T_{N_{\mathrm{\Σ}},1}& ...& T_{N_{\mathrm{\Σ}},i}& ...& T_{N_{\mathrm{\Σ}},N_{\mathrm{\Σ}}}\end{array}\right]$

In formula:

for the element of the i-th row in contact unit maximum load rate matrix, jth row, the contact capacity namely between No. i-th main transformer and jth main transformer, R _iand R _jthe amount of capacity of No. i-th main transformer and jth main transformer respectively.

Step 3.3.3: calculate main transformer contact capacity requirement;

When definition main transformer load transfer plan matrix represents that main transformer " N-1 " verifies, the load of interconnected main transformer turns band situation, and main transformer load transfer plan matrix is as shown in the formula definition:

$Tr=\left[\begin{array}{ccccc}{\mathrm{Tr}}_{1,1}& ...& {\mathrm{Tr}}_{1,i}& ...& {\mathrm{Tr}}_{1,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& ...& .& ...& .\\ .& & .& & .\\ {\mathrm{Tr}}_{i,1}& ...& {\mathrm{Tr}}_{i,i}& ...& {\mathrm{Tr}}_{i,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& ...& .& ...& .\\ .& & .& & .\\ {\mathrm{Tr}}_{N_{\mathrm{\Σ}},1}& ...& {\mathrm{Tr}}_{N_{\mathrm{\Σ}},i}& ...& {\mathrm{Tr}}_{N_{\mathrm{\Σ}},N_{\mathrm{\Σ}}}\end{array}\right]$

In formula:

Tr _i,j=R _j(1-T _i,j), the maximum load rate of jth main transformer when being No. i-th main transformer fault;

Definition s _i,jit is the contact capacity requirement between i-th main transformer and jth platform main transformer;

s _i,j＝s _j,i＝max(Tr _j,i,Tr _i,j)

Step 3.3.4: calculate demand contact between interconnected transformer station and count;

Determine the Connection Mode of medium-voltage line, according to the line load rate requirement of different Connection Mode, calculate every bar circuit turn for time available nargin, be shown below:

m＝R _l(1-t _l)

In formula:

M---circuit turns available nargin when supplying;

R _l---the capacity of single line;

T _l---the permission running load rate of single line, this numerical value is relevant with the Connection Mode that circuit adopts.

According to get in touch with between transformer station capacity requirement and circuit turn for time available nargin calculate connectivity number between the station that should set up between main transformer, computing method as shown in the formula:

$c_{i,j}=\[\frac{{\mathrm{Tr}}_{i,j}}{m}+1\]$

$c_{\mathrm{int}er}^{\left(z\right)}=\underset{i=N_{(z-1)\mathrm{\Σ}}+1}{\overset{N_{z\mathrm{\Σ}}}{\Σ}}\underset{j=1}{\overset{N_{\mathrm{\Σ}}}{\Σ}}{c}_{i,j}$

In formula:

N _{(z-1) Σ}+ 1 is the numbering of First main transformer in transformer station z;

N _{z Σ}for the numbering of last main transformer in transformer station z;

C _i,j---the contact needed between main transformer i and main transformer j is counted;

C _inter ^(z)---contact sum between the station of transformer station z.

Investigate the total outlet number of transformer station, remove connectivity number between station, remaining circuit sets up contact in station, and in standing, connectivity number utilizes following formula to calculate:

$c_{inner}^{\left(z\right)}=\frac{N_l-c_{\mathrm{int}er}^{\left(z\right)}}{2}$

In formula:

C _inner ^(z)---contact sum in the station of transformer station z;

N _l---total outlet number of transformer station.

Step 3.4: press feeder line to get in touch with situation in calculating, provide the wiring of middle pressure network frame

Press the middle pressure feeder line contact situation calculated in feeder line situation and above-mentioned steps 3.3 in this step basis, provide the wiring of middle pressure network frame.

Below for a certain " industry park " functional areas electrical network, the method proposed according to the present invention is planned its following electrical network.

(1) load prediction and Substation Optimization

Adopt traditional load and Substation Optimization method, the result of load prediction and Substation Optimization as shown in Figure 5.

(2) high pressure space truss project

Functional areas electrical network scale is less, is that in functional areas, 2 110kV transformer stations power by 1 220kV transformer station outside functional areas as the high-voltage power supply of functional areas.According to substation location structure, contrast typical wiring mode construction simple functional areas high pressure rack, establish functional areas electrical network and to become more meticulous the basis of planning, intend adopting double T wiring construction, high pressure rack program results as shown in Figure 6.

(3) pressure space truss project in

This step and traditional distribution network planning different, traditional distribution network planning utilizes the capacity-load ratio estimated to limit transformer station's load supply, and rough estimating makes equipment sparing too much, affect the economy of distribution network construction operation; And the present invention reduces the reserved of equipment sparing by the ability more accurately grasping medium-voltage line transfer load, improve functional areas power grid construction economy.First planning determine the overall interconnect scheme of transformer station in functional areas by contrast typical transformer station interconnect architecture; And then between the interconnected transformer station of accurate Calculation, shift the demand of capacity; Press contact scheme during the circuit model that last basis is selected and medium-voltage line connection type calculate, in formation, press the wiring diagram of feeder line.

(3.1) high voltage substation interconnect architecture

First will for substation location better simply in functional areas, contrast some through demonstration build the interconnected whole strategy of substation low-voltage side compared with Optimizing Mode, two, 110kV transformer station is only had in functional areas, first completely interconnected transformer station's interconnect architecture is formed, interconnected transformer station spacing meets the requirement of deleting principle 1 and 2 in step (3.2), and the number of interconnection of Mei Zuo transformer station is 1.Contrast typical interconnect architecture, match with the typical interconnect architecture of Tu2Zhong 2 transformer station, can be used as the ordering plan that substation low-voltage side is interconnected, as shown in Figure 7.

(3.2) in, pressure contact capacity requirement calculates

On the functional areas transformer station interconnect architecture basis determined in last step, main transformer low-pressure side adopts the contact scheme shown in Fig. 3, according to the contact capacity requirement between the formulae discovery main transformer of step (3.3.1) to (3.3.3), result of calculation is as table 1 and table 2.

Table 1110kV transformer station table

Pressure contact capacity requirement table in table 2

(3.3) in, pressure contact is counted calculating

According to the contact capacity requirement in table 2, can calculating in the how many strip adoption station of substation low-voltage side outlet and get in touch with, getting in touch with between how many strip adoption station (for ensureing the security that power distribution network runs, not advising adopting radial line to power).10kV medium-voltage line adopts YJV22-3 × 300, and current carrying capacity of conductor is 552A, and circuit capacity is 9.56MVA, and medium-voltage line is unified adopts the simply connected network mode of connection, and according to the formula in step (3.3.4), result of calculation is as table 3.

Pressure network frame Policy Table in table 3

(3.4) pressure feeder line wiring in

According to above computational analysis, provide middle pressure installation scenarios, as shown in Figure 8.

The permission load factor that the grid structure main transformer built according to the present invention runs is as following table 4.

The table 4 main transformer running load rate table of comparisons

Can find out, because functional areas electric network composition is simple, a small amount of transformer station is easy to the one-piece construction building high pressure rack and middle pressure network frame with reference to typical module, is easy to centering pressure network frame simultaneously and carries out the calculating that becomes more meticulous.The present invention determines height, middle pressure network shelf structure by medelling and presses contact scheme in the calculating that becomes more meticulous, and the contact of middle pressure network frame is built reasonable, the security basis ensureing operation of power networks is improved the economy of power grid construction O&M.

It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other embodiments drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.

Claims (3)

1. functional areas power distribution network becomes more meticulous a planing method, it is characterized in that: comprise the following steps:

Step 1: by the data of collecting function district Net Frame of Electric Network, load and growth requirement, determine the capacity of high voltage substation, position and service area;

Step 2: carry out functional areas high-voltage distribution network planning; To the concrete grammar of functional areas high-voltage distribution network planning be: according to the requirement of reliability, the Connection Mode of employing and main wiring mode, set up simple functional areas high pressure rack, the power supply of the distribution substation in planning function district, to establish in functional areas pressure network frame in transformer station and to become more meticulous the basis of planning;

Step 3: carry out functional areas MV distribution systems and to become more meticulous planning, specifically comprise the following steps:

Step 3.1: the typical interconnect architecture setting up high voltage substation group on a small scale;

Step 3.2: layout and service area in conjunction with high voltage substation, constructing function district electricity grid substation interconnect architecture; The method of described constructing function district electricity grid substation interconnect architecture is:

Step 3.2.1: transformer station in functional areas is set up structure interconnected between two, successively all the other transformer stations is traveled through to Mei Zuo transformer station and set up interconnecting relation;

Step 3.2.2: delete unreasonable interconnecting relation according to deletion principle, is formed and forms blank contact interconnect architecture by reasonable interconnecting relation;

Step 3.2.3: according to the typical interconnect architecture of small-scale high voltage substation group, by increasing or deleting a small amount of interconnecting relation, is configured to the typical structure the most close with it by transformer station's blank contact interconnect architecture in functional areas;

Step 3.3: pressure network frame scheme in constructing function district electrical network; To give full play to functional areas power distribution network power supply capacity for target, pressure network frame scheme in constructing function district electrical network; In constructing function district electrical network, the concrete grammar of pressure network frame scheme is:

Following connection form is all adopted: any main transformer of transformer station is only got in touch with mutually with a wherein main transformer at offside station between the transformer station that there is interconnecting relation in step 3.2, and concrete needs how many feeder lines are got in touch with mutually between two main transformers, determined by calculating below:

Step 3.3.1: extract main transformer communication relationship matrix:

Have n seat transformer station in functional areas, to i-th station jth main transformer renumber into and will be labeled as N _{i Σ}, then the numbering of i-th station jth platform main transformer is designated as (N _{(i-1) Σ}+ j), get the total number of units of main transformer for presentation function district, the corresponding main transformer capacity size of No. i-th is R _i;

Provide main transformer communication relationship matrix L _link:

$L_{link}=\left[\begin{array}{ccccc}{L}_{1,1}& \mathrm{...}& L_{1,i}& \mathrm{...}& L_{1,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& \mathrm{...}& .& \mathrm{...}& .\\ .& & .& & .\\ L_{i,1}& \mathrm{...}& L_{i,i}& \mathrm{...}& L_{i,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& \mathrm{...}& .& \mathrm{...}& .\\ .& & .& & .\\ L_{N_{\mathrm{\Σ}},1}& \mathrm{...}& L_{N_{\mathrm{\Σ}},i}& \mathrm{...}& L_{N_{\mathrm{\Σ}},N_{\mathrm{\Σ}}}\end{array}\right]$

Wherein L _i,jrepresent i-th main transformer and jth platform main transformer communication relationship (i=1,2,3 ..., N _Σ; J=1,2,3 ..., N _Σ), have during communication relationship and get L _i,j=1, otherwise L _i,j=0; And there is communication relationship, i.e. L between supposition main transformer and self _i,i=1;

Step 3.3.2: analyze contact unit power supply capacity:

In main transformer communication relationship matrix, by the main transformer maximum load situation having communication relationship with i-th main transformer can be determined in the i-th row vector, the contact unit maximum load rate matrix that represents of matrix definable following formula according to this:

$T=\left[\begin{array}{ccccc}{T}_{1,1}& \mathrm{...}& T_{1,i}& \mathrm{...}& T_{1,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& \mathrm{...}& .& \mathrm{...}& .\\ .& & .& & .\\ T_{i,1}& \mathrm{...}& T_{i,i}& \mathrm{...}& T_{i,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& \mathrm{...}& .& \mathrm{...}& .\\ .& & .& & .\\ T_{N_{\mathrm{\Σ}},1}& \mathrm{...}& T_{N_{\mathrm{\Σ}},i}& \mathrm{...}& T_{N_{\mathrm{\Σ}},N_{\mathrm{\Σ}}}\end{array}\right]$

In formula:

for the element of the i-th row in contact unit maximum load rate matrix, jth row, the contact capacity namely between No. i-th main transformer and jth main transformer, R _iand R _jthe amount of capacity of No. i-th main transformer and jth main transformer respectively;

Step 3.3.3: calculate main transformer contact capacity requirement;

When definition main transformer load transfer plan matrix represents that main transformer " N-1 " verifies, the load of interconnected main transformer turns band situation, and main transformer load transfer plan matrix is as shown in the formula definition:

$Tr=\left[\begin{array}{ccccc}{\mathrm{Tr}}_{1,1}& \mathrm{...}& {\mathrm{Tr}}_{1,i}& \mathrm{...}& {\mathrm{Tr}}_{1,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& \mathrm{...}& .& \mathrm{...}& .\\ .& & .& & .\\ {\mathrm{Tr}}_{i,1}& \mathrm{...}& {\mathrm{Tr}}_{i,i}& \mathrm{...}& {\mathrm{Tr}}_{i,N_{\mathrm{\Σ}}}\\ .& & .& & .\\ .& \mathrm{...}& .& \mathrm{...}& .\\ .& & .& & .\\ {\mathrm{Tr}}_{N_{\mathrm{\Σ}},1}& \mathrm{...}& {\mathrm{Tr}}_{N_{\mathrm{\Σ}},i}& \mathrm{...}& {\mathrm{Tr}}_{N_{\mathrm{\Σ}},N_{\mathrm{\Σ}}}\end{array}\right]$

In formula:

Tr _i,j=R _j(1-T _i,j), the maximum load rate of jth main transformer when being No. i-th main transformer fault;

Definition s _i,jit is the contact capacity requirement between i-th main transformer and jth platform main transformer;

s _i,j＝s _j,i＝max(Tr _j,i,Tr _i,j)

Step 3.3.4: calculate demand contact between interconnected transformer station and count;

Determine the Connection Mode of medium-voltage line, according to the line load rate requirement of different Connection Mode, calculate every bar circuit turn for time available nargin, be shown below:

m＝R _l(1-t _l)

In formula:

M---circuit turns available nargin when supplying;

R _l---the capacity of single line;

T _l---the permission running load rate of single line, this numerical value is relevant with the Connection Mode that circuit adopts;

According to get in touch with between transformer station capacity requirement and circuit turn for time available nargin calculate connectivity number between the station that should set up between main transformer, computing method as shown in the formula:

$c_{i,j}=\[\frac{{\mathrm{Tr}}_{i,j}}{m}+1\]$

$c_{\mathrm{int}er}^{\left(z\right)}=\underset{i=N_{(z-1)\mathrm{\Σ}}+1}{\overset{N_{z\mathrm{\Σ}}}{\Σ}}\underset{j=1}{\overset{N_{\mathrm{\Σ}}}{\Σ}}{c}_{i,j}$

In formula:

N _{(z-1) Σ}+ 1 is the numbering of First main transformer in transformer station z;

N _{z Σ}for the numbering of last main transformer in transformer station z;

C _i,j---the contact needed between main transformer i and main transformer j is counted;

C _inter ^(z)---contact sum between the station of transformer station z;

Investigate the total outlet number of transformer station, remove connectivity number between station, remaining circuit sets up contact in station, and in standing, connectivity number utilizes following formula to calculate:

$c_{inner}^{\left(z\right)}=\frac{N_l-c_{\mathrm{int}er}^{\left(z\right)}}{2}$

In formula:

C _inner ^(z)---contact sum in the station of transformer station z;

N _l---total outlet number of transformer station;

Step 3.4: press feeder line to get in touch with situation in calculating, provide the wiring of middle pressure network frame.

2. a kind of functional areas according to claim 1 power distribution network becomes more meticulous planing method, it is characterized in that: the method that described step 2 carries out functional areas high-voltage distribution network planning is: adopt Connection Mode and main wiring mode, set up the power supply of distribution substation in simple functional areas high pressure rack, planning function district.

3. a kind of functional areas according to claim 1 power distribution network becomes more meticulous planing method, it is characterized in that: described deletion principle is:

Delete principle 1: delete the transformer station's interconnecting relation crossing over natural or artificial geographical barriers;

Delete principle 2: delete and exceed critical distance transformer station interconnecting relation;

Delete principle 3: ensure that the interconnected transformer station sum of final arbitrary transformer station is no more than 4, if the interconnected transformer station number of certain transformer station exceeds, according to contact distance from big to small delete the interconnecting relation exceeded in turn.