CN102916431A - Assisted decision making method for load transfer in regional power grid - Google Patents

Abstract

The invention provides an assisted decision making method for load transfer in a regional power grid. The method comprises the following steps: (1) setting a target power-off device; (2) performing statistics on load information; (3) analyzing a load transfer strategy; and (4) evaluating economic safety. In the method, remote signalling, remote measuring and power grid topology information existing in a dispatching automation system are utilized fully to fastly and exactly generate a load transfer scheme capable of meeting the requirement of economic and safe operation of the power grid, thereby preventing the situations such as load shedding or long-time power off, out-of-limit overload and the like from happening during the load transfer scheme.

Description

Area power grid load transfer aid decision-making method

Technical field

The invention belongs to the power automation field, be specifically related to a kind of area power grid load transfer aid decision-making method.

Background technology

The general closed loop design of area power grid, the open loop operation connects by the stand-by heat switch, structurally generally is rendered as radial pattern.Load transfer is problem common in the area power grid traffic control, have a power failure when running into apparatus overload or equipment fault, during overhaul of the equipments, for improving the power supply reliability to the user, the dispatcher generally is by the scheduling experience or carries out rough manual calculations, then carry out load transfer, the dead electricity load is restored electricity, although solved the problem of dead electricity load restoration power supply by experience, but turn whether optimum for the path, turn whether simple for operation, turn for after operational mode economic security whether, all be uncertain, generally before operation, also need to inquire about related data or record, ageing can not the assurance, especially in case of emergency, the management and running personnel often active demand be accurate succinct object information.

Summary of the invention

For overcoming defects, the invention provides a kind of area power grid load transfer aid decision-making method, take full advantage of already present remote signalling in the dispatch automated system, remote measurement and power network topology information, generate quickly and accurately the scheme of confession that turns that can satisfy the electrical network economy safe operation, avoid in turning for the scheme process, cause load rejection or user to have a power failure for a long time, the situations such as out-of-limit overload occur.

For achieving the above object, the invention provides a kind of area power grid load transfer aid decision-making method, its improvements are, described method comprises the steps:

(1). the Offered target power failure equipments;

(2). the statistics information on load;

(3). analyze lotus and turn for strategy;

(4). the assessment economy and security.

In the optimal technical scheme provided by the invention, in described step 1, described target power failure equipments is the equipment that causes loading and have a power failure, and comprising: faulty equipment and repair apparatus; Target power failure equipments attribute comprises: device name, device type, end factory station and two end factories station.

In the second optimal technical scheme provided by the invention, in described step 2, according to grid structure and power system operating mode, electrical network is carried out topological analysis form computation model; Wherein, topological analysis comprises: factory's station bus analysis and grid analysis.

In the 3rd optimal technical scheme provided by the invention, factory's station bus analysis comprises: according to the folding condition of switch and withdrawing from/returning to form of element, form bus model by node model; What buses the interior node of a certain electric pressure of analyzing a certain factory station is connected into by Closing Switch, and the factory station is divided into several buses.

In the 4th optimal technical scheme provided by the invention, the grid analysis: what subnets the bus of analyzing whole electrical network is connected into by closed branch road; Wherein, every sub-electrical network is the set that the bus of electrical link is arranged, same sub-electrical network of general genus when electric power system normally moves.

In the 5th optimal technical scheme provided by the invention, in described step 3, comprise the steps:

(3-1). the statistics information on load;

(3-2). according to statistics, analysis load turns for strategy.

In the 6th optimal technical scheme provided by the invention, step 3-1 comprises the steps:

(A). before the excision of target power failure equipments, the whole network is carried out Topology Analysis Based one time, and preserve the topological state of each equipment in the ground state situation;

(B). excision target power failure equipments, carry out again Topology Analysis Based, preserve the topological state of each equipment under the current state;

(C). before and after the excision of contrast target power failure equipments, the topological state of circuit, transformer, switch, disconnecting link and bus obtains affected factory station and information on load.

In the 7th optimal technical scheme provided by the invention, step 3-2 comprises the steps:

(a). the load ordering;

(b). determine to turn for task;

(c). the search power supply point;

(d). determine to turn for the path;

(e). topological analysis search power supply point;

(f). overloading analysis;

(g). the load rejection analysis;

(h). determine to turn for scheme.

In the 8th optimal technical scheme provided by the invention, in described step a, according to turning for type load is sorted, if having a power failure, target device turns confession, then all affected loads are sorted high-risk user, responsible consumer, domestic consumer according to significance level; If target device overload, then all affected loads according to meritorious from small to large arranged sequentially of load.

In the 9th optimal technical scheme provided by the invention, in described step b, turn for task and turn confession if target device has a power failure, then all loads of having added up are all forwarded to the zone of normal power supply, to recover the normal safe power supply of power failure load;

Turn for task if target device is crossed idling and supply, then analyze the overload quantity of current goal equipment, load is compared with overload quantity successively according to meritorious order from small to large, find out first meritorious value greater than the load of overload quantity, then this load is for turning the load of confession; In twos combination is compared with overload quantity more from small to large if each load is gained merit less than overload quantity, successively back and forth until find the load that will turn confession.

In the tenth optimal technical scheme provided by the invention, in described step c, has the power supply point that turns for ability according to turning to filter out for task, calculate the voltage of each power supply point and the voltage difference absolute value that supplies load place bus when forward, getting the minimum power supply point of its value turns for load, and calculate the cyclization impulse current, if do not find power supply point to go to step e.

In the more preferably technical scheme provided by the invention, in described steps d, search turns for the path according to power supply point, and cumulative switch motion number of times is judged whether the switch motion number of times reaches the upper limit, skips to step g if reach the upper limit, otherwise gone to step f.

Provided by the invention second more preferably in the technical scheme, in described step e, adopt the search of topology search technology when forward for the equipment switch of task periphery as increasing power supply point newly, and then screen power supply point from rotating function power and two angles of impulse current; If find power supply point then go to steps d, otherwise go to step g.

The provided by the invention the 3rd more preferably in the technical scheme, in described step f, judges whether current power supply point associate device transships, if overload is returned step a, otherwise goes to step h; Wherein, the power supply point associate device comprises: circuit and transformer.

The provided by the invention the 4th more preferably in the technical scheme, in described step g, carries out overloading analysis, and the computation overload amount is according to domestic consumer, responsible consumer, high-risk user's successively load rejection of order, until accumulated value is more than or equal to overload quantity.

The provided by the invention the 5th more preferably in the technical scheme, in described step 5, from the economy of switch motion number of times, network loss, 3 angles assessments of load rejection amount load transfer scheme; And from impulse current, get rid of the fail safe that user, 3 angles of out-of-limit angle weigh load transfer.

The provided by the invention the 6th more preferably in the technical scheme, and the economy from switch motion number of times, network loss, 3 angles assessments of load rejection amount load transfer scheme designs following valuation functions and economic index valuation functions:

Switch motion number of times valuation functions:

$f_{\mathrm{cb}}=\frac{n_{\mathrm{cb}}}{n_{\mathrm{cb}\_\max }}---\left(1\right)$

The network loss valuation functions:

$f_{\mathrm{loss}}=\frac{f_{\mathrm{loss}\_\mathrm{now}}-f_{\mathrm{loss}\_\mathrm{base}}}{f_{\mathrm{loss}\_\mathrm{base}}}---\left(2\right)$

The load rejection valuation functions:

$f_{\mathrm{loseload}}=\frac{p_{\mathrm{load}\_\mathrm{lose}}}{p_{\mathrm{load}\_\mathrm{tran}}}---\left(3\right)$

The economic evaluation function:

f _economy＝exp[-(a ₁f _cb+a ₂f _loss+a ₃f _lossload)] (4)

Formula (1) is in (4): n _CbBe switch motion number of times, n _{Cb_max}Be the switch motion number of times upper limit, f _{Loss_now}For turning the whole network active power loss after supplying, f _{Loss_base}For turning for front the whole network active power loss p _{Load_loss}Be meritorious load rejection amount, p _{Load_tran}For turning the burden with power amount of confession, n _{Vio_base}For turning for front voltage out-of-limit number n _{Vio_now}Turn for rear voltage out-of-limit number f _EconomyFor turning for scheme economic index function, a ₁, a ₂, a ₃Be respectively weight.

The provided by the invention the 7th more preferably in the technical scheme, from impulse current, get rid of the fail safe that user, 3 angles of out-of-limit angle weigh load transfer, designs following valuation functions and fail safe economic index valuation functions:

Cyclization impulse current valuation functions:

$f_i=\left\{\begin{array}{cc}1& (i_{\max }>=i_{\mathrm{set}})\\ 0& (i_{\max }<i_{\mathrm{set}})\end{array}\right.---\left(5\right)$

Get rid of user's valuation functions:

$f_{\mathrm{loseuser}}=\frac{{\mathrm{user}}_{\mathrm{hr}}+{\mathrm{user}}_{\mathrm{vip}}}{{\mathrm{user}}_{\mathrm{hr}\_\mathrm{all}}+{\mathrm{user}}_{\mathrm{vip}\_\mathrm{all}}}---\left(6\right)$

The voltage out-of-limit valuation functions:

$f_{\mathrm{vio}}=\frac{|v_{\mathrm{vio}\_\mathrm{now}}-v_{\mathrm{vio}\_\mathrm{base}}|}{\max (v_{\mathrm{vio}\_\mathrm{now}},v_{\mathrm{vio}\_\mathrm{base}})}---\left(7\right)$

The safety indexes valuation functions:

f _safe＝exp[-(a ₄f _i+a ₅f _loseuser+a ₆f _vio)] (8)

Formula (5) is in (8): f _iBe cyclization impulse current valuation functions, i _MaxBe maximum cyclization impulse current, i _SetBe feeder line fast tripping protection setting value; f _LoseuserFor getting rid of user's valuation functions, user _HrFor successfully not turning the high-risk number of users of confession, user in the load transfer process _VipFor successfully not turning the responsible consumer number of confession, user in the load transfer process _{Hr_all}Be high-risk total number of users in the transfer task, user _{Vip_all}Be responsible consumer sum in the transfer task, v _{Vio_now}Turn for rear voltage out-of-limit number v _{Vio_base}Turn for front voltage out-of-limit number a ₄, d ₅, a ₆Be respectively weight.

Compared with the prior art, a kind of area power grid load transfer aid decision-making method provided by the invention, flexible Offered target device type, faulty equipment, repair apparatus, out-of-limit equipment can be simulated the operating problem of actual electric network, carry out the load transfer analysis; The quick load Information Statistics by topological analysis technique, can be added up affected information on load according to the target device rapid analysis; Turn for route searching, can combine path search techniques with the load transfer expert system, find optimum to turn for the path; Path search techniques adopts and turns continuously the confession technology, has avoided owing to the out-of-limit or overload situations that turns for the information that causes, guarantees to turn for the path security reliability; Perfect economic security assessment, can carry out from aspects such as switch motion number of times, network loss, impulse current, load rejection, out-of-limit situations the economy and security assessment, turn for after the economy of operational mode and fail safe quantize to show, the dispatcher can be recognized turn the risk class for scheme; For the dispatcher provides load transfer strategy report, the dispatcher can be made things convenient for and comprehensively understand the load transfer scheme information; The method embodies regional load and turns for tactful rapidity, accuracy and reliability, take full advantage of already present remote signalling in the dispatch automated system, remote measurement and power network topology information, generate quickly and accurately the scheme of confession that turns that can satisfy the electrical network economy safe operation, avoid in turning for the scheme process, cause load rejection or user to have a power failure for a long time, the situations such as out-of-limit overload occur; The load transfer aid decision belongs to intellectual analysis and the aid decision of dispatch automated system and uses, main purpose is based on trouble hunting or transships out-of-limit equipment, carry out influenced information on load statistics, turn for analysis of strategies based on expert system and topology search technology, can take full advantage of expert system turns for the path to find fast, consider to turn the newly-increased overload situations for causing in the process, the load that causes overload is turned continuously for analyzing.To turning for scheme of generating, carry out the economy and security assessment of load transfer scheme from indexs such as switch motion number of times, network loss, impulse current, load rejection, out-of-limit situations.

Description of drawings

Fig. 1 is the schematic flow sheet of area power grid load transfer aid decision-making method.

Fig. 2 is load transfer Policy Table structure chart.

Fig. 3 is the schematic flow sheet of statistics information on load.

Fig. 4 is the schematic diagram of economy and security assessment.

Fig. 5 is the detailed process schematic diagram of load transfer aid decision-making method.

Embodiment

Term and definition

Power supply point: the stand-by heat switch of periphery, dead electricity district.

Turn for the path: the sequence of movement of switch.

Turn for capacity: the line load rate of power supply point.

Network element: switch, unit, load, capacitor or reactor, transformer and circuit etc. all become network element.Wherein transformer, circuit and switch etc. are called the both-end element, and transformer and circuit are called again series arm; Unit, load, capacitor or reactor etc. are called single-ended element, are called again parallel branch.

Node: be the tie-point of network element, element is connected into electrical network by mutual public node.

The expert system definition: according to electrical network history run experience, definition load transfer strategy expert system.

Load group definition: according to electrical network day-to-day operation experience, the switching situation of load, have the identical load that turns for the path and be defined as the load group in the load transfer process, the essential information of load group comprises load group number, load name, meritorious, idle, affiliated factory station.When carrying out the load transfer program, meritorious value and idle value can be refreshed according to the data section.

High-risk user refers to cause personal injury, device damage, will produce waste product, and the production order can not be recovered for a long time, and people's lives occur chaotic, for high-risk user, take the measure of interruption of power supply; Responsible consumer refers to cause a large amount of underproduction, will make the affected user of people's lives, also takes the measure of interruption of power supply for responsible consumer; What all did not belong to high-risk user, responsible consumer all belongs to domestic consumer.

Shown in Fig. 1,5, a kind of area power grid load transfer aid decision-making method comprises the steps:

(1). the Offered target power failure equipments; (2). the statistics information on load; (3). analyze lotus and turn for strategy; (4). the assessment economy and security.

As shown in Figure 2, power supply turns for path definition: based on the load group, according to topological connection relation, operation of power networks experience, for each group load defines power supply and turns for the path.The factory station is defined as power supply, if there are a plurality of power supply sources that turn in the load group, then defines priority according to operating experience for respectively turning power supply source; After having determined that each turns power supply source, for belonging to the turning for path definition priority of same power supplies.

The Offered target power failure equipments: the target power failure equipments is the cause of load transfer, and the equipment that namely causes loading and have a power failure comprises faulty equipment, repair apparatus etc.Target power failure equipments attribute comprises device name, device type, end factory station, two end factories station.Can select a plurality of equipment, dissimilar equipment.

Equipment is set to the target power failure equipments, namely the target power failure equipments is defined as the object that load transfer is analyzed.

The trend parameter arranges: adopt trend to calculate turning the scheme after supplying, carry out verification.The parameter setting that trend is calculated comprises meritorious convergence precision, idle convergence precision and maximum iteration time.

Statistics information on load: based on the target power failure equipments that sets, according to grid structure and power system operating mode, at first electrical network is carried out topological analysis and form computation model, then search for affected factory station and information on load.

Topological analysis: node model is also referred to as physical model, and it is the original description to network, this model of input data; Bus model is also referred to as computation model, and it and network equation link together.Bus model changes with on off state.It is exactly according on off state and the network element state process by the bus model of the node model generation electrical network of electrical network that network connection is analyzed.

The power system network Topology Analysis Based is divided into two basic steps:

Factory's station bus analysis: according to the folding condition of switch and withdrawing from/returning to form of element, form bus model by node model.Function is that what buses the interior node of a certain electric pressure of analyzing a certain factory station is connected into by Closing Switch, consequently the factory station is divided into several buses.Bus is to be closed the node set that the logic branch road links together.

Grid is analyzed: what subnets the bus of analyzing whole electrical network is connected into by closed branch road, and every sub-electrical network is the set that the bus of electrical link is arranged, same sub-electrical network of general genus when electric power system normally moves.

Information on load statistics: the topological status attribute of define grid element obtains the topological state of each network element by Topology Analysis Based.As shown in Figure 3, the information on load system mainly can be divided into three steps:

At first before the excision of target power failure equipments, the whole network is carried out Topology Analysis Based one time, and preserve the topological state of each equipment in the ground state situation;

Then excise the target power failure equipments, again carry out Topology Analysis Based, preserve the topological state of each equipment under the current state;

By before and after the excision of contrast target power failure equipments, the topological state of other network elements obtains affected factory station and information on load at last.

The load transfer analysis of strategies: based on the area power grid characteristics, according to operation of power networks experience and typical case, definition load transfer Policy Table, responsible consumer and high-risk user form the substance of expert system.

Turn for strategy and have a power failure and two kinds of apparatus overloads turn the confession type and analyze from equipment.Based on expert system and topology search technology, turn for analysis of strategies.Consider to turn the new overload for causing in the process, adopt to turn continuously the confession technology, the concrete analysis process is as follows:

A. load ordering

The information on load statistical function is searched for affected information on load by the topology search technology.According to turning for type load is sorted, turn confession if target device has a power failure, then all affected loads are sorted high-risk user, responsible consumer, domestic consumer according to significance level; If target device overload, then all affected loads according to meritorious from small to large arranged sequentially of load.

B. determine to turn for task

Turn confession if target device has a power failure, then turning for task is exactly the zone that all loads of having added up is all forwarded to normal power supply, to recover the normal safe power supply of power failure load.

If target device is crossed the idling confession, then at first analyze the overload quantity of current goal equipment, load is compared with overload quantity successively according to meritorious order from small to large, find out first meritorious value greater than the load of overload quantity, this load is the load that will turn confession.In twos combination is compared with overload quantity more from small to large if each load is gained merit less than overload quantity, successively back and forth until find the load that will turn confession.

C. expert system is searched for power supply point

Turn economy and fail safe for mode for improving computational speed and assurance, preferentially adopt the method search power supply point of expert system, have the power supply point that turns for ability according to turning to filter out for task.Calculate the voltage of each power supply point and the voltage difference absolute value that supplies load place bus when forward, get the minimum power supply point of its value and turn for load, and calculating cyclization impulse current.If do not find power supply point to go to step e.

D. determine to turn for the path

Search turns for the path according to power supply point, and cumulative switch motion number of times is judged whether the switch motion number of times reaches the upper limit, skips to step g if reach the upper limit, otherwise gone to step f.

E. topological analysis is searched for power supply point (considering the change of operational mode)

Adopt the search of topology search technology when the stand-by heat switch conduct newly-increased power supply point of forward for the task periphery, and then from rotating function power and two angle screenings of impulse current power supply point.If find power supply point to turn steps d, if do not find power supply point to go to step g.

F. overloading analysis

Judge whether current power supply point associate device transships, if overload is returned step a, otherwise go to step h.

G. load rejection analysis

At first carry out overloading analysis, the computation overload amount is according to load important procedure domestic consumer, responsible consumer, the successively load rejection of high-risk user order from low to high, until accumulated value is more than or equal to overload quantity.

H. determine to turn for scheme

As shown in Figure 4, the process of economy and security assessment is as follows:

From the economy of switch motion number of times, network loss, 3 angle assessments of load rejection amount load transfer scheme, and design following valuation functions and economic index valuation functions.

Switch motion number of times valuation functions:

$f_{\mathrm{cb}}=\frac{n_{\mathrm{cb}}}{n_{\mathrm{cb}\_\max }}---\left(1\right)$

The network loss valuation functions:

$f_{\mathrm{loss}}=\frac{f_{\mathrm{loss}\_\mathrm{now}}-f_{\mathrm{loss}\_\mathrm{base}}}{f_{\mathrm{loss}\_\mathrm{base}}}---\left(2\right)$

The load rejection valuation functions:

$f_{\mathrm{loseload}}=\frac{p_{\mathrm{load}\_\mathrm{lose}}}{p_{\mathrm{load}\_\mathrm{tran}}}---\left(3\right)$

The economic evaluation function:

f _economy＝exp[-(a ₁f _cb+a ₂f _loss+a ₃f _lossload)] (4)

Formula (1) is in (4): n _CbBe switch motion number of times, n _{Cb_max}Be the switch motion number of times upper limit, f _{Loss_now}For turning the whole network active power loss after supplying, f _{Loss_base}For turning for front the whole network active power loss p _{Load_loss}Load rejection amount (gaining merit), p _{Load_tran}Be the load (gaining merit) that will turn confession, n _{Vio_base}For turning for front voltage out-of-limit number n _{Vio_now}Turn for rear voltage out-of-limit number.f _EconomyFor turning for scheme economic index function.a ₁, a ₂, a ₃Be respectively weight.

Wherein, f _CbOn be limited to 1, switch motion number of times upper limit n _{Cb_max}Can be set by the user, can pass through n to the consideration of switch action frequency _{Cb_max}And a ₁The common adjustment is so consider the life-span of switch and the complexity f of operation _CbTax is with larger weight a ₁=0.3; Network loss valuation functions f _LossCan find out that by formula its value can just can bear, when its value can improve economic index when negative, consider to turn for after operational mode can't be permanent so f _LossTax is with less weight a ₂=0.2; Consider the purpose of load transfer for guaranteeing the reliability of customer power supply, therefore tax is with f _LossloadLarger weight a ₃=0.5.

From impulse current, get rid of user (important and high-risk user), 3 angles of out-of-limit angle are weighed the fail safe of load transfer, and design following valuation functions and fail safe economic index valuation functions.

Cyclization impulse current valuation functions:

$f_i=\left\{\begin{array}{cc}1& (i_{\max }>=i_{\mathrm{set}})\\ 0& (i_{\max }<i_{\mathrm{set}})\end{array}\right.---\left(5\right)$

Get rid of user's valuation functions:

$f_{\mathrm{loseuser}}=\frac{{\mathrm{user}}_{\mathrm{hr}}+{\mathrm{user}}_{\mathrm{vip}}}{{\mathrm{user}}_{\mathrm{hr}\_\mathrm{all}}+{\mathrm{user}}_{\mathrm{vip}\_\mathrm{all}}}---\left(6\right)$

The voltage out-of-limit valuation functions:

$f_{\mathrm{vio}}=\frac{|v_{\mathrm{vio}\_\mathrm{now}}-v_{\mathrm{vio}\_\mathrm{base}}|}{\max (v_{\mathrm{vio}\_\mathrm{now}},v_{\mathrm{vio}\_\mathrm{base}})}---\left(7\right)$

The safety indexes valuation functions:

f _safe＝exp[-(a ₄f _i+a ₅f _loseuser+a ₆f _vio)] (8)

Formula (5) is in (8): f _iCyclization impulse current valuation functions, i _MaxMaximum cyclization impulse current, i _SetFeeder line fast tripping protection setting value; f _LoseuserFor getting rid of user's valuation functions, user _HrFor successfully not turning the high-risk number of users of confession, user in the load transfer process _VipFor successfully not turning the responsible consumer number of confession, user in the load transfer process _{Hr_all}Be high-risk total number of users in the transfer task, user _{Vip_all}Be responsible consumer sum in the transfer task, v _{Vio_now}Turn for rear voltage out-of-limit number v _{Vio_base}Turn for front voltage out-of-limit number a ₄, a ₅, a ₆Be respectively weight.

Wherein, if maximum cyclization impulse current greater than setting value, then can not cyclization, therefore as impulse current a during greater than setting value ₄=1, otherwise a ₄=0.The purpose of load transfer namely guarantees user's reliable power supply, and therefore getting rid of user's valuation functions should give larger weight a ₅=0.6, and a ₆=0.4.

Setting the optimum index of economy is 1, and the optimum index of fail safe is 1, and economic index and safety indexes lower limit all are 0.9, namely need to consider the feasibility of load transfer scheme when desired value is lower than 0.9.

What need statement is that content of the present invention and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the restriction to protection range of the present invention.Those skilled in the art can do various modifications, be equal to and replace or improve inspired by the spirit and principles of the present invention.But these changes or modification are all in the protection range that application is awaited the reply.

Claims (18)

1. an area power grid load transfer aid decision-making method is characterized in that, described method comprises the steps:

(1). the Offered target power failure equipments;

(2). the statistics information on load;

(3). analyze lotus and turn for strategy;

(4). the assessment economy and security.

2. method according to claim 1 is characterized in that, in described step 1, described target power failure equipments is the equipment that causes loading and have a power failure, and comprising: faulty equipment and repair apparatus; Target power failure equipments attribute comprises: device name, device type, end factory station and two end factories station.

3. method according to claim 1 is characterized in that, in described step 2, according to grid structure and power system operating mode, electrical network is carried out topological analysis form computation model; Wherein, topological analysis comprises: factory's station bus analysis and grid analysis.

4. method according to claim 3 is characterized in that, factory's station bus analysis comprises: according to the folding condition of switch and withdrawing from/returning to form of element, form bus model by node model; What buses the interior node of a certain electric pressure of analyzing a certain factory station is connected into by Closing Switch, and the factory station is divided into several buses.

5. method according to claim 3 is characterized in that, the grid analysis: what subnets the bus of analyzing whole electrical network is connected into by closed branch road; Wherein, every sub-electrical network is the set that the bus of electrical link is arranged, same sub-electrical network of general genus when electric power system normally moves.

6. method according to claim 1 is characterized in that, in described step 3, comprises the steps:

(3-1). the statistics information on load;

(3-2). according to statistics, analysis load turns for strategy.

7. method according to claim 6 is characterized in that, step 3-1 comprises the steps:

(A). before the excision of target power failure equipments, the whole network is carried out Topology Analysis Based one time, and preserve the topological state of each equipment in the ground state situation;

(B). excision target power failure equipments, carry out again Topology Analysis Based, preserve the topological state of each equipment under the current state;

(C). before and after the excision of contrast target power failure equipments, the topological state of circuit, transformer, switch, disconnecting link and bus obtains affected factory station and information on load.

8. method according to claim 6 is characterized in that, step 3-2 comprises the steps:

(a). the load ordering;

(b). determine to turn for task;

(c). the search power supply point;

(d). determine to turn for the path;

(e). topological analysis search power supply point;

(f). overloading analysis;

(g). the load rejection analysis;

(h). determine to turn for scheme.

9. method according to claim 8 is characterized in that, in described step a, according to turning for type load is sorted, turn confession if target device has a power failure, then all affected loads are sorted high-risk user, responsible consumer, domestic consumer according to significance level; If target device overload, then all affected loads according to meritorious from small to large arranged sequentially of load.

10. method according to claim 8 is characterized in that, in described step b, turns for task and turns confession if target device has a power failure, and then all loads of having added up is all forwarded to the zone of normal power supply, to recover the normal safe power supply of power failure load;

Turn for task if target device is crossed idling and supply, then analyze the overload quantity of current goal equipment, load is compared with overload quantity successively according to meritorious order from small to large, find out first meritorious value greater than the load of overload quantity, then this load is for turning the load of confession; In twos combination is compared with overload quantity more from small to large if each load is gained merit less than overload quantity, successively back and forth until find the load that will turn confession.

11. method according to claim 8, it is characterized in that, in described step c, has the power supply point that turns for ability according to turning to filter out for task, calculate the voltage of each power supply point and the voltage difference absolute value that supplies load place bus when forward, get the minimum power supply point of its value and turn for load, and calculate the cyclization impulse current, if do not find power supply point to go to step e.

12. method according to claim 8 is characterized in that, in described steps d, search turns for the path according to power supply point, and cumulative switch motion number of times is judged whether the switch motion number of times reaches the upper limit, skips to step g if reach the upper limit, otherwise gone to step f.

13. method according to claim 8, it is characterized in that, in described step e, adopt the search of topology search technology when the equipment switch conduct newly-increased power supply point of forward for the task periphery, and then from rotating function power and two angle screenings of impulse current power supply point; If find power supply point then go to steps d, otherwise go to step g.

14. method according to claim 8 is characterized in that, in described step f, judges whether current power supply point associate device transships, if overload is returned step a, otherwise goes to step h; Wherein, the power supply point associate device comprises: circuit and transformer.

15. method according to claim 8 is characterized in that, in described step g, carries out overloading analysis, the computation overload amount is according to domestic consumer, responsible consumer, high-risk user's successively load rejection of order, until accumulated value is more than or equal to overload quantity.

16. method according to claim 1 is characterized in that, in described step 5, from the economy of switch motion number of times, network loss, 3 angle assessments of load rejection amount load transfer scheme; And from impulse current, get rid of the fail safe that user, 3 angles of out-of-limit angle weigh load transfer.

17. method according to claim 16 is characterized in that, the economy from switch motion number of times, network loss, 3 angle assessments of load rejection amount load transfer scheme designs following valuation functions and economic index valuation functions:

Switch motion number of times valuation functions:

$f_{\mathrm{cb}}=\frac{n_{\mathrm{cb}}}{n_{\mathrm{cb}\_\max }}---\left(1\right)$

The network loss valuation functions:

$f_{\mathrm{loss}}=\frac{f_{\mathrm{loss}\_\mathrm{now}}-f_{\mathrm{loss}\_\mathrm{base}}}{f_{\mathrm{loss}\_\mathrm{base}}}---\left(2\right)$

The load rejection valuation functions:

$f_{\mathrm{loseload}}=\frac{p_{\mathrm{load}\_\mathrm{lose}}}{p_{\mathrm{load}\_\mathrm{tran}}}---\left(3\right)$

The economic evaluation function:

f _economy＝exp[-(a ₁f _cb+a ₂f _loss+a ₃f _lossload)] (4)

Formula (1) is in (4): n _CbBe switch motion number of times, n _{Cb_max}Be the switch motion number of times upper limit, f _{Loss_now}For turning the whole network active power loss after supplying, f _{Loss_base}For turning for front the whole network active power loss p _{Load_loss}Be meritorious load rejection amount, p _{Load_tran}For turning the burden with power amount of confession, n _{Vio_base}For turning for front voltage out-of-limit number n _{Vio_now}Turn for rear voltage out-of-limit number f _EconomyFor turning for scheme economic index function, a ₁, a ₂, a ₃Be respectively weight.

18. method according to claim 16 is characterized in that, from impulse current, get rid of the fail safe that user, 3 angles of out-of-limit angle weigh load transfer, designs following valuation functions and fail safe economic index valuation functions:

Cyclization impulse current valuation functions:

$f_i=\left\{\begin{array}{cc}1& (i_{\max }>=i_{\mathrm{set}})\\ 0& (i_{\max }<i_{\mathrm{set}})\end{array}\right.---\left(5\right)$

Get rid of user's valuation functions:

$f_{\mathrm{loseuser}}=\frac{{\mathrm{user}}_{\mathrm{hr}}+{\mathrm{user}}_{\mathrm{vip}}}{{\mathrm{user}}_{\mathrm{hr}\_\mathrm{all}}+{\mathrm{user}}_{\mathrm{vip}\_\mathrm{all}}}---\left(6\right)$

The voltage out-of-limit valuation functions:

$f_{\mathrm{vio}}=\frac{|v_{\mathrm{vio}\_\mathrm{now}}-v_{\mathrm{vio}\_\mathrm{base}}|}{\max (v_{\mathrm{vio}\_\mathrm{now}},v_{\mathrm{vio}\_\mathrm{base}})}---\left(7\right)$

The safety indexes valuation functions:

f _safe＝exp[-(a ₄f _i+a ₅f _loseuser+a ₆f _vio)] (8)

Formula (5) is in (8): f _iBe cyclization impulse current valuation functions, i _MaxBe maximum cyclization impulse current, i _SetBe feeder line fast tripping protection setting value; f _LoseuserFor getting rid of user's valuation functions, user _HrFor successfully not turning the high-risk number of users of confession, user in the load transfer process _VipFor successfully not turning the responsible consumer number of confession, user in the load transfer process _{Hr_all}Be high-risk total number of users in the transfer task, user _{Vip_all}Be responsible consumer sum in the transfer task, v _{Vio_now}Turn for rear voltage out-of-limit number v _{Vio_base}Turn for front voltage out-of-limit number a ₄, a ₅, a ₆Be respectively weight.

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