CN103872770A - Different power supply region feeder automation collocation method based on wiring mode - Google Patents

Abstract

The invention discloses a different power supply region feeder automation collocation method based on a wiring mode. The method comprises the following steps that 1, different power supply subregions are combined, different wiring modes and feeder lines are adopted to calculate reliability promoting levels which are brought after automatic allocation schemes of different levels are adopted; 2, the electric price levels of the power supply subregions to which the feeder lines belong are combined to calculate the economic benefit level brought by increased power supply volume after the reliability is promoted; 3, the social benefit brought by the increased power supply volume is analyzed through the region unit electric quantity GDP (Gross Domestic Product) production value level; 4, the investment benefit ratio of each feeder line automation configuration mode is calculated; 5, the feeder line automation configuration mode which is most suitable for each power supply subregion is obtained, and the most adaptive feeder line automation configuration is carried out on each power supply subregion. A layering collocation mode is provided by combing with different feeder line wiring modes, the reliability and the economy of the feeder lines are effectively improved, and the larger promotion of the reliability of a weak power grid is favorably realized by automation low input.

Description

A kind of feeder automation collocation method of the different power supply areas based on Connection Mode

Technical field

The present invention relates to the feeder automation collocation method in distribution feeder automation field, relate in particular to based on Connection Mode, realize automation for the employing distinct methods realization control 6kV/10kV/20kV feeder line of different power supply zones.

Background technology

At present, feed line automatization system taking once with secondary device as basis, in conjunction with the utilization of computer, automatically control and the communication technology, realize power distribution network is implemented to online or monitored off-line management, the core of feeder automation is the service restoration of fault detect, failure diagnosis, Fault Isolation and non-fault zone.Domestic traditional feeder automation construction at present, transformation are normally according to region requirement, on central city or the higher all switches in region of reliability requirement or cabinet, generally adopt higher " three is distant ", " four is distant " technology to realize, be singly the configuration mode of choosing power distribution automation from the significance level of power supply area, easily produce the problem of clean cut.All adopt high investment, high performance automation configuration mode might not bring due lifting effect in important region, also be unfavorable for improving the rate of reaching the standard grade and the effect of automation equipment, be also necessary and promote feeder automation at non-important area simultaneously.

Traditional configuration mode also has certain one-sidedness in the time promoting, main cause is can have in various degree manifold connection modes at same power supply area, but a certain Connection Mode has different requirements to automated communication, configuration mode etc., therefore configuration aspect should be in conjunction with the Connection Mode of feeder line.These problems all can not provide clear and definite solution in current equipping rules, also there is no clear and definite explanation for realizing the effect that can bring to electrical network after automation simultaneously.

Summary of the invention

The object of this invention is to provide a kind of different power supply area feeder automation collocation methods based on Connection Mode, can realize by the low input of automation the larger lifting of weak electric network reliability.

The present invention adopts following technical proposals: a kind of different power supply area feeder automation collocation methods based on Connection Mode, comprise the following steps:

(1), in conjunction with different power supply zones, adopt different Connection Modes and feeder line adopting the reliability winding level bringing after the automation allocation plan of varying level to calculate;

(2), in conjunction with the power supply zone electricity price level under this feeder line, after computed reliability promotes, increase the economic benefit level brought of electricity sales amount;

(3), by regional unit quantity of electricity GDP output value level, analyze and increase the social benefit brought of amount of power supply;

(4), calculate every kind of returns of investment ratio under feeder automation configuration mode;

(5), the requirement to power supply reliability in conjunction with every class power supply zone, and economic benefit, social benefit, specific investment cost situation of Profit, draw the most applicable such power supply zone of which kind of feeder automation configuration mode, then every class power supply zone is carried out to optimal feeder automation configuration.

In described step (1), calculating reliability level lifting draws by calculating power supply reliability, the power supply reliability that calculates various representative network structures adopts state-space method, by setting up the running status markov state model of each element, build the state space of representative network, according to network configuration, the power down mode of system under each state, interruption duration in analysis state space, lack amount of power supply parameter, can obtain the reliability of system, the computing formula of reliability is as described below:

$\mathrm{\Σ}{U}_i{N}_i=\frac{R}{\mathrm{num}}\×\mathrm{\λ}\×\frac{N}{\mathrm{num}}\×\{\mathrm{num}\×r+[\left(\underset{i=1}{\overset{\mathrm{num}}{\mathrm{\Σ}}}i\right)-\mathrm{num}]\×t\×2\}$

In above formula, N---number of users;

U---customer outage hours;

RS---power supply reliability;

The segments of num---circuit;

The radius of electricity supply of R---circuit;

The failure rate of λ---circuit;

The mean time to repair of r---circuit;

The back brake time of t---circuit.

Then obtain the reliability level of same feeder automation under the reliability level of different feeder automations under same power supply zone and different power supply zone according to reliability.

In described step (2) computed reliability after promoting, increase the direct economic benefit level that electricity sales amount brings be result taking Calculation of Reliability as foundation, calculate the economic benefit calculation formula that increasing electricity sales amount that different power supply zone single back line reliabilities promote brings as follows:

User's hourage=(1-power supply reliability/100) × annual hourage that on average has a power failure;

Increase electricity sales amount=user's load × user's hourage that on average has a power failure that on average has a power failure;

Economic benefit=increasing electricity sales amount × average rate of electricity sold;

Obtain the economic benefit level of same feeder automation under the economic benefit level of different feeder automations under same power supply zone and different power supply zone according to economic benefit.

Described step (3) be total amount of power supply of implementing to bring after feeder automation be foundation, in conjunction with different unit quantity of electricity GDP output value levels, calculate social benefit, computing formula is:

Every degree electricity is to the GDP=somewhere total industrial and agricultural output value/this area of total industrial and agricultural output value amount of power supply then;

In feeder automation 1 year to the every degree electricity of the GDP=of total industrial and agricultural output value the GDP × increasing amount of power supply to total industrial and agricultural output value.

Described step (4) is according under each feeder automation configuration mode, increases direct economic benefit and unit quantity of electricity GDP output value level that amount of power supply produces, calculates its returns of investment ratio, and computing formula is as follows:

Returns of investment ratio=(increasing direct economic benefit+unit quantity of electricity GDP output value level that electricity sales amount produces)/construction investment.

The present invention proposes feeder automation configuration mode from the power supply area of different subregions, based on existing FEEDER AUTOMATION, the configuration mode that has levels and feel is proposed in conjunction with different feeder line Connection Modes, can effectively improve feeder reliability, economy, be conducive to realize by the low input of automation the larger lifting of weak electric network reliability.Specific as follows:

1, the effect that the feeder line that has quantized different power supply areas, different Connection Modes promotes under different automatization levels aspect reliability;

2, quantification zones of different, different Connection Mode are being realized economic benefit and the social benefit of varying level feeder automation;

3, recommend different power supply area feeder automation mode configuration modes, instruct feeder automation retrofit work.

Brief description of the drawings

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

Fig. 2 is fault detector allocation plan;

Fig. 3 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation allocation plan;

Fig. 4 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation fault point schematic diagram;

Fig. 5 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation automatic circuit coincidence schematic diagram;

Fig. 6 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation sectionalizer coincidence schematic diagram

Fig. 7 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation separating brake locking schematic diagram;

Fig. 8 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation automatic circuit, sectionalizer reclosing block schematic diagram for the second time;

Fig. 9 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation interconnector reclosing schematic diagram for the first time;

Figure 10 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation interconnector reclosing schematic diagram for the second time;

Figure 11 is that automatic circuit and voltage-time type sectionalizer coordinate feeder automation locking operation schematic diagram;

Figure 12 is the conceptual scheme of the intelligent distributed feeder automation under the built on stilts single interconnector of electricity;

Figure 13 is the centralized feeder automation conceptual scheme under overhead transmission line list interconnector.

Embodiment

According to latest company of State Grid Corporation of China company standard " distribution network planning designing technique directive/guide ", specify that state's web area power supply area territory is divided into 5 classes: category-A, category-B, C class, D class, E class power supply area.The mode of connection has: cable system dicyclic, monocyclic, twinshot, correlation, n, for one standby (n >=2), make somebody a mere figurehead the contact of many segmentations appropriateness, simply connected network, single radiation etc.

As shown in Figure 1, the invention discloses a kind of different power supply area feeder automation collocation methods based on Connection Mode, start with from configuration mode and the condition of various feeder automation patterns, the influencing factor of analytical equipment configuration number, and influencing factor is carried out to in-depth studying, provide the allocation plan of all kinds of power supply areas feeder automation pattern under same grid structure.Specifically comprise the following steps:

(1), in conjunction with different power supply zones, adopt different Connection Modes and feeder line adopting the reliability winding level bringing after the automation allocation plan of varying level to calculate;

Described computed reliability level promotes by calculating power supply reliability and draws, the power supply reliability that calculates various representative network structures adopts state-space method, by setting up the running status markov state model of each element, build the state space of representative network, according to network configuration, the power down mode of system under each state, interruption duration in analysis state space, lack amount of power supply parameter, can obtain the reliability of system, the computing formula of reliability is as described below:

$\mathrm{\Σ}{U}_i{N}_i=\frac{R}{\mathrm{num}}\×\mathrm{\λ}\×\frac{N}{\mathrm{num}}\×\{\mathrm{num}\×r+[\left(\underset{i=1}{\overset{\mathrm{num}}{\mathrm{\Σ}}}i\right)-\mathrm{num}]\×t\×2\}$

In formula, N---number of users (family/returning);

U---customer outage hours;

RS---power supply reliability (%);

The segments (section/returning) of num---circuit;

The radius of electricity supply (km) of R---circuit;

The failure rate (inferior/km × year) of λ---circuit;

The mean time to repair (hour/time) of r---circuit;

The back brake time (hour/time) of t---circuit.

Can obtain the reliability level of same feeder automation under the reliability level of different feeder automations under same power supply zone and different power supply zone according to above formula.For the built on stilts simply connected network mode of connection, the result of calculation of reliability is as shown in table 1: in same service area, feeder automation reliability winding level variation tendency is: the feeder automation > fault location automation of the intelligent distributed feeder automation > automatic circuit mode of centralized feeder automation >; Under the same feeder automation level of different service areas, the horizontal variation tendency of reliability is: category-B >C class >D class >E class.

(2), in conjunction with the power supply zone electricity price level under this feeder line, after promoting, computed reliability increases the economic benefit level that electricity sales amount brings;

In described step (2) computed reliability after promoting, increase the direct economic benefit level that electricity sales amount brings be result taking Calculation of Reliability as foundation, calculate the economic benefit calculation formula that increasing electricity sales amount that different power supply zone single back line reliabilities promote brings as follows:

User's hourage=(1-power supply reliability/100) × annual hourage that on average has a power failure;

Increase electricity sales amount=user's load × user's hourage that on average has a power failure that on average has a power failure;

Economic benefit=increasing electricity sales amount × average rate of electricity sold;

Wherein user's limits value/number of users of load=circuit total load that on average has a power failure.

Obtain the economic benefit level of same feeder automation under the economic benefit level of different feeder automations under same power supply zone and different power supply zone according to economic benefit.

For the built on stilts simply connected network mode of connection, the result of calculation of economic benefit is as shown in table 1: in same service area, feeder automation economic benefit level is: the feeder automation > fault location automation of the intelligent distributed feeder automation > automatic circuit mode of centralized feeder automation >; Under the same feeder automation level of different service areas, reliability level presents contrary phenomenon: category-B <C class <D class <E class.

(3), by regional unit quantity of electricity GDP output value level, analyze and increase the social benefit that amount of power supply is brought;

This step be total amount of power supply of implementing to bring after feeder automation be foundation, in conjunction with different unit quantity of electricity GDP output value levels, calculate and increase amount of power supply (increase electricity sales amount+comprehensive line loss) to economic pulling function, i.e. social benefit, computing formula is:

Every degree electricity is to the GDP=somewhere total industrial and agricultural output value/this area of total industrial and agricultural output value amount of power supply then;

In feeder automation 1 year to the every degree electricity of the GDP=of total industrial and agricultural output value the GDP × increasing amount of power supply to total industrial and agricultural output value.

Social benefit quantizes the GDP increase output value by increasing amount of power supply, adopt after various feed line automatization systems circuit in a year and increasing amount of power supply without any feeder automation equipment, in conjunction with this area's electricity price per GDP output value (herein according to 5.48 yuan/kWh), calculate and increase the social benefit that amount of power supply is brought, i.e. GDP.For the built on stilts simply connected network mode of connection, the result of calculation of social benefit is as shown in table 1: the variation tendency of social benefit is consistent with economic benefit variation tendency.

(4) calculate every kind of returns of investment ratio under feeder automation configuration mode;

This step is under each feeder automation configuration mode, according to the direct economic benefit and the unit quantity of electricity GDP output value level that increase amount of power supply generation, calculates its returns of investment ratio, and computing formula is as follows:

Returns of investment ratio=(increasing direct economic benefit+unit quantity of electricity GDP output value level that electricity sales amount produces)/construction investment;

For the built on stilts simply connected network mode of connection, the result of calculation of returns of investment ratio is as shown in table 1.

(5) requirement to power supply reliability in conjunction with every class power supply zone, and economic benefit, social benefit, specific investment cost situation of Profit, draw the most applicable such power supply zone of which kind of feeder automation configuration mode, then every class power supply zone is carried out to optimal feeder automation configuration.

Table 1

Illustrate: 1. construction investment refers to that single back line adopts the investment of feeder automation configuration;

2. economic benefit refers to that increasing electricity sales amount increasing that power supply enterprise is brought sells benefit;

3. social benefit refers to and increases the GDP increase that amount of power supply is brought local society;

4. returns of investment are than referring to the summation of economic benefit and social benefit and the ratio of investment.

For the result of calculation of the built on stilts simply connected network mode of connection shown in table 1, be analyzed as follows:

For category-B power supply area, because category-B power supply area is higher to reliability requirement, require the reliability index at a specified future date can not be lower than 99.990%, consider the economic benefit, the social benefit that realize automation and bring simultaneously, and returns of investment such as compare at the multinomial factor, consider and meeting under the prerequisite of reliability requirement, the effect that adopts intelligent distributed feeder automation to bring is best.

For C class power supply area, reliability at a specified future date requires more than %, adopt automatic circuit automation configuration mode, intelligent distributed feeder automation, centralized feeder automation all can meet reliability requirement, but consider benefit and sensitiveness, recommend adoption automatic circuit automation configuration mode effect is best.

For D class power supply area, reliability at a specified future date requires more than 99.897%, and adopts heavy four kinds of feeder automations all can meet reliability requirement, but adopts fault location automation investment minimum, susceptibility is the highest, and recommend adoption fault location automation configuration mode effect is best.

Because E class power supply area does not have reliability requirement, consider that in above four kinds of feeder automations, fault location automation investment is minimum, susceptibility is the highest, therefore recommend adoption fault location automation configuration.

The present invention is compared with existing feeder automation collocation method, can specify the construction mode of different power supply areas territory for the feeder automation of Connection Mode, can be on the basis of reliability results, after adopting various feeder automation patterns, the typical electrical network Connection Mode that provides each power supply area brings benefit, can be used to instruct following 10kV distribution network feeder Automation Construction, be conducive to carrying out of the intelligent work of feeder automation retrofit work and electrical network.

Describe in the application of category-B, C class, D class, E class power supply area to make somebody a mere figurehead the simply connected network contact mode of connection.The feeder automation mode that built on stilts simply connected network wiring can realize has fault location configuration mode, automatic circuit automation configuration mode, intelligent distributed automation configuration mode, concentrates mode in feeder automation configuration mode four.Set forth the function implementation of every kind of configuration mode below:

(1) fault location configuration mode

1) the overhead wire pass cable place (comprise drawing and drop down onto the inlet wire cable of terminal client and the lead-in of full cable branch line) that falls, in the time that this cable is circuit link cable, (this section of cable act as and connects two sections of overhead transmission lines, cable two ends are all connected with overhead transmission line), must install respectively one group at cable end place, both sides, A, E as shown in Figure 1, F, G.

2) built on stilts backbone block switch place, should install one group of display device for short circuit in block switch load side; On circuit, without any segmentation, distance exceedes 2000m, and fault detector should be in position installed, and at least 2000m installs one group in principle, B as shown in Figure 2.

3) built on stilts branched line has a line control switch, should install one group at switch back segment.Do not prop up line control switch and line length and exceed 500m, should be at branch line and one group of Truck Connection place (suggestion is at No. 1 shaft tower of branch line) installation, C, D as shown in Figure 2.

4) when circuit running status changes or when line failure, export to the equal board turning of all fault detectors or the flash of light instruction of fault point on circuit from transformer station, and fault detector behind fault point is failure to actuate.

(2) automatic circuit automation configuration mode

Built on stilts simply connected network contact wiring can only adopt automatic circuit and voltage-time type sectionalizer matching model.

While being illustrated in figure 3 a ring network open loop operation, adopt automatic circuit to coordinate the process of isolated fault with voltage-time type sectionalizer.A adopts automatic circuit, and it is one slow two fast adjusting, and be 15s reclosing time for the first time; B, C and D adopt voltage-time type sectionalizer and are arranged on first set the function that is applied to the block switch of normally off, and X time limit expansion is decided to be 7s, and Y time limit expansion is decided to be 5s; E adopts voltage-time type sectionalizer, but is arranged on the function of the second cover interconnection switch, and its XL time limit setting is 45s, and Y time limit setting is 5s.Suppose that c section breaks down (as Fig. 4), in the situation of normal work.

If Fig. 5 is after c section generation permanent fault, automatic circuit A tripping operation, causes interconnection switch left side circuit dead electricity to be pressed, and causes sectionalizer B, the equal separating brake of C and D, and interconnection switch E starts X timer.

After emergency stop valve trip 15s, automatic circuit A overlap for the first time (as Fig. 6).

After the X time limit of 7s, sectionalizer B automatic reclosing, supplies electricity to b section again.

After the X time limit of 7s, sectionalizer C automatic reclosing, now because c section exists permanent fault, again cause automatic circuit A tripping operation, thereby circuit dead electricity pressure causes the equal separating brake of sectionalizer B and C again.The Y time limit that does not reach 5s after closing a floodgate due to sectionalizer C just again dead electricity press, this sectionalizer is latched in gate-dividing state (as Fig. 7).

After automatic circuit A trips again, overlap for the second time through 5s again, sectionalizer B automatic closing after 7s, and sectionalizer C keeps gate-dividing state (as Fig. 8) because of locking.

After automatic circuit A trips for the first time, after the X time limit of 45s, interconnection switch E automatic closing, supplies electricity to d section (as Fig. 9).

After the X time limit of 7s, sectionalizer D automatic closing, now has in c section and has permanent fault again, cause the automatic circuit tripping operation of interconnection switch right side circuit, thereby circuit dead electricity pressure in right side causes the equal separating brake of its all sectionalizers.The Y time limit that does not reach 5s after closing a floodgate due to sectionalizer D just again dead electricity press, this sectionalizer is latched in gate-dividing state (as Figure 10).

As the sectionalizer on Figure 11 interconnection switch and right side and automatic circuit close a floodgate again in order, and sectionalizer D keeps gate-dividing state because of locking, thereby has isolated fault section, has recovered to perfect section power supply.This organizes single interconnector left side circuit and has adopted 1 automatic circuit and 3 voltage-time type sectionalizers, supposing has n voltage-time type sectionalizer on the circuit of right side, this group circuit isolated fault section time of recovering the power supply of non-fault section are (67+7n) s, if there are 3 sectionalizers on the circuit of right side, this feeder line group isolated fault the time of recovering the power supply of non-fault section are 88s.

(3) intelligent distributed automation configuration mode

1) feeder line sectionalised protection scheme

On built on stilts simply connected network loop, switch all adopts circuit breaker as shown in figure 12, and open loop point is located at E.On each switch, all configure the FTU with defencive function.Communication adopts optical fiber communication, between substation/main website and FTU, adopts fiber-optic self-healing ring, and between FTU, communication adopts fiber optic point point to-point communication.

Suppose that b section breaks down, A, B have overcurrent to flow through, and C is without overcurrent.B inquires that A has overcurrent mark, and C is without overcurrent mark, B with regard to separating brake with isolated fault point; C inquires that B has overcurrent mark and D does not have overcurrent mark, C with regard to separating brake with isolated fault point; E detects a side dead electricity, and time delay inquires that D, F are without overcurrent mark, and E just closes a floodgate to recover to perfect block supply.

2) the differential scheme of feeder line

The maximum of the differential scheme of feeder line and feeder line sectionalised protection scheme is not both on looped network cabinet switch equipment, and except outlet switch adopts circuit breaker or automatic circuit, other switches in loop all adopt cheap on-load switch or sectionalizer.Because these switches can not segment failure electric current; in the time that FTU detects overcurrent fault and determines a certain side at this FTU; control switch separating brake immediately; and the protection action that will wait for wire-outgoing breaker trip, is cut off the electricity supply, FTU detect dead electricity press after ability control overhead switch separating brake at the appointed time, isolated fault section.After wire-outgoing breaker time delay a period of time (to ensure segmentation on-load switch action message), close a floodgate, recover non-fault section power supply.Interconnection switch is time delay a period of time (waiting for after Fault Isolation) combined floodgate also, recovers opposite side in faulty section and perfects section power supply.

(4) centralized feeder automation configuration mode

As shown in figure 13 for making somebody a mere figurehead the configuration of centralized feeder automation under simply connected network electric network composition, QF1, QF2 are transformer station's outlet breaker (or automatic circuit), Q11, Q12, Q21, Q22 are the block switch on circuit, and Qt is interconnection switch, in open position.Outlet breaker configuration RTU(remote terminal unit), each block switch and interconnection switch all configure the FTU with defencive function.This programme needs that higher level master's (son) stands, having cooperatively interacted of communication system, detection and control terminal; Terminal need to configure uninterrupted power supply, can be provided by the storage battery in FTU, has the switch of independent tank circuit, and the alternating current 220V being provided by PT can be provided its accumulation power supply.Block switch and interconnection switch type can be on-load switch or circuit breaker.Communication system adopts the communication system of high efficient and reliable, generally adopts optical fiber communication mode.

Suppose that F point breaks down, wire-outgoing breaker QF1 protects action, if transient fault, after QF1 overlaps, circuit restores electricity; If permanent fault, QF1 disconnects after overlapping again, starts the DA of main website function.Concrete process is: the fault message collecting is uploaded to main website by each terminal; Q11 has fault current to flow through, and Q12, Q21, Q22, Qt do not have fault current to flow through, and main website determines that fault occurs between Q11, Q12; Main station system is sent out guidance command disconnects Q11 and Q12, isolated fault region, and closed interconnection switch Qt, recovers the power supply of right side, fault zone, and closed wire-outgoing breaker QF1 recovers the power supply of left side, fault zone.

Claims (5)

1. the different power supply area feeder automation collocation methods based on Connection Mode, is characterized in that: comprise the following steps:

(1), in conjunction with different power supply zones, adopt different Connection Modes and feeder line adopting the reliability winding level bringing after the automation allocation plan of varying level to calculate;

(2), in conjunction with the power supply zone electricity price level under this feeder line, after computed reliability promotes, increase the economic benefit level brought of electricity sales amount;

(3), by regional unit quantity of electricity GDP output value level, analyze and increase the social benefit brought of amount of power supply;

(4), calculate every kind of returns of investment ratio under feeder automation configuration mode;

(5), the requirement to power supply reliability in conjunction with every class power supply zone, and economic benefit, social benefit, specific investment cost situation of Profit, draw the most applicable such power supply zone of which kind of feeder automation configuration mode, then every class power supply zone is carried out to optimal feeder automation configuration.

2. the different power supply area feeder automation collocation methods based on Connection Mode according to claim 1, it is characterized in that: in described step (1), calculate reliability level lifting and draw by calculating power supply reliability, the power supply reliability that calculates various representative network structures adopts state-space method, by setting up the running status markov state model of each element, build the state space of representative network, according to network configuration, the power down mode of system under each state in analysis state space, interruption duration, lack amount of power supply parameter, can obtain the reliability of system, the computing formula of reliability is as described below:

$\mathrm{\&Sigma;}{U}_i{N}_i=\frac{R}{\mathrm{num}}\&times;\mathrm{\&lambda;}\&times;\frac{N}{\mathrm{num}}\&times;\{\mathrm{num}\&times;r+[\left(\underset{i=1}{\overset{\mathrm{num}}{\mathrm{\&Sigma;}}}i\right)-\mathrm{num}]\&times;t\&times;2\}$

In above formula, N---number of users;

U---customer outage hours;

RS---power supply reliability;

The segments of num---circuit;

The radius of electricity supply of R---circuit;

The failure rate of λ---circuit;

The mean time to repair of r---circuit;

The back brake time of t---circuit.

Then obtain the reliability level of same feeder automation under the reliability level of different feeder automations under same power supply zone and different power supply zone according to reliability.

3. the different power supply area feeder automation collocation methods based on Connection Mode according to claim 1, it is characterized in that: in described step (2) computed reliability after promoting, increase the direct economic benefit level that electricity sales amount brings be result taking Calculation of Reliability as foundation, calculate the economic benefit calculation formula that increasing electricity sales amount that different power supply zone single back line reliabilities promote brings as follows:

User's hourage=(1-power supply reliability/100) × annual hourage that on average has a power failure;

Increase electricity sales amount=user's load × user's hourage that on average has a power failure that on average has a power failure;

Economic benefit=increasing electricity sales amount × average rate of electricity sold;

Obtain the economic benefit level of same feeder automation under the economic benefit level of different feeder automations under same power supply zone and different power supply zone according to economic benefit.

4. the different power supply area feeder automation collocation methods based on Connection Mode according to claim 1, it is characterized in that: described step (3) be total amount of power supply of implementing to bring after feeder automation be foundation, in conjunction with different unit quantity of electricity GDP output value levels, calculate social benefit, computing formula is:

Every degree electricity is to the GDP=somewhere total industrial and agricultural output value/this area of total industrial and agricultural output value amount of power supply then;

In feeder automation 1 year to the every degree electricity of the GDP=of total industrial and agricultural output value the GDP × increasing amount of power supply to total industrial and agricultural output value.

5. the different power supply area feeder automation collocation methods based on Connection Mode according to claim 1, it is characterized in that: described step (4) is according under each feeder automation configuration mode, increase direct economic benefit and unit quantity of electricity GDP output value level that amount of power supply produces, calculate its returns of investment ratio, computing formula is as follows:

Returns of investment ratio=(increasing direct economic benefit+unit quantity of electricity GDP output value level that electricity sales amount produces)/construction investment.

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