CN106684862A - Method of searching distribution network load transfer path based on greedy algorithm - Google Patents
Method of searching distribution network load transfer path based on greedy algorithm Download PDFInfo
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- CN106684862A CN106684862A CN201611159025.1A CN201611159025A CN106684862A CN 106684862 A CN106684862 A CN 106684862A CN 201611159025 A CN201611159025 A CN 201611159025A CN 106684862 A CN106684862 A CN 106684862A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention belongs to the field of distribution network load transfer, and in particular relates to a method of searching a distribution network load transfer path based on a greedy algorithm. The method comprises the steps of (S1) searching for all the blocks adjacent to ai and in a normal power supply state when a power point of the power supply block ai exits, finding a connection switch which is required to be closed for the transfer for ai, and denoting the total number of adjacent power supply blocks that can transfer power for ai as t; (S2) finding an uninterruptible power transfer scheme, the process containing no load shedding operation; and (S3) obtaining a viable transfer scheme by shedding a part of the load. According to the invention, a transfer path is quickly found in an area where the power is cut off due to sudden failure during the actual operation of a distribution network, and the probability of operation failure of an operator is reduced with the minimum number of switching operations as the target, thereby effectively improving the power supply reliability.
Description
Technical field
The invention belongs to distribution network load turns to supply field, more particularly to a kind of distribution network load based on greedy algorithm to turn to supply
Method for searching path.
Background technology
Used as the final tache of power system, its power supply reliability directly determines the power quality of user to power distribution network.When
When power distribution network breaks down, except needing isolated fault region and as early as possible repairing it, in addition it is also necessary to the greatest extent may be used by load transfer
Failure can be reduced to the overall impact of power distribution network.After load transfer refers to that power distribution network breaks down and isolated, by opening
The excision of the inessential load of the operation of pass and part, under conditions of security constraint is met, quick preferential recovery fault down stream
While important load is powered, the power supply of other loads is also recovered as far as possible.Load transfer can substantially reduce failure band because of it
The loss for coming, improves power supply reliability, becomes one of Core Feature important in distribution automation system.
At present both at home and abroad many scholars are segmented into following a few classes substantially to the method that load transfer is proposed：Heuristic calculation
Method, Stochastic Optimization Algorithms, expert system approach.Above-mentioned algorithm can obtain feasible turning solution output, but exist certain
Defect.Heuritic approach cannot accomplish the optimality for solving, and the quality for solving depends on the original state of network；Stochastic Optimization Algorithms
The calculating time is often longer, in not being suitable for large scale network；In specialist system the foundation in storehouse and it is integrated waste time and energy, and therefore
Barrier huge number, it is impossible to record the whole circumstances.
In distribution actual moving process, need to propose turning solution in time for all kinds of burst power-off, therefore to algorithm
Arithmetic speed and the suitability have higher requirement, and existing algorithm has some limitations.And in order to reduce work
The probability of human users' error, the turning solution of algorithm output should make switching manipulation number of times as few as possible.For the demand, urgently
Must propose that a kind of new distribution network load turns to supply method for searching path.
So-called greedy algorithm, i.e. decision making process do not consider global optimality, and decision objective is only that benefit is most under conditions present
It is excellent.
The content of the invention
For the problem in background technology, the present invention proposes that a kind of distribution network load based on greedy algorithm turns to be searched for path
Suo Fangfa, is that the region of the power-off because of catastrophic failure in distribution actual moving process is quickly found out and turns to supply path, and with minimum
Switch motion number of times is target, reduces the probability of operated by personnel's error, effectively increases power supply reliability.
For achieving the above object, the present invention proposes following technical scheme：
A kind of distribution network load based on greedy algorithm turns to supply method for searching path, in the process, by distribution network
Abstract is the topological diagram being made up of point set N and side collection E, and all nodes are classified as into power supply node collection S { si|si∈ N }, load bus
Collection L { lj|lj∈ N } and bus nodes collection C { ck|ck∈ N } three class set；Connect the side e of consecutive points on topological diagramijComprising one
Switch, is denoted as：
Distribution is divided into into several power supplies block A { a1, a2..., an}；
A distributed photovoltaic power generation system in distribution is equivalent to into a power supply node plus a load bus；
Methods described is concretely comprised the following steps：
(S1) as power supply block aiPower supply point it is out of service when, search for all and aiIt is adjacent and in normal power supply state
Block, and it is a to find itiTurn the connecting valve for required closure, can be aiTurn total for the adjacent power supply block of electric power
Number scale is t；
(S2) a kind of turning solution of not power-off is found, this process is operated not comprising cutting load；
(S3) by a part of load of excision, feasible turning solution is obtained.
Further, the step (S2) is multistep, and most execution step numbers are t；
The step (S2) comprises the steps again：
(S2-1) a connecting valve is arbitrarily closed, traversal is possible to situation；If in the case of any one, Load flow calculation
As a result meet normal running (operation) conditions, then stop and export the turning solution；Otherwise, if t >=2, perform (S2-2)；If t ＜ 2, enter
Enter step (S3)；
(S2-2) two connecting valves are arbitrarily closed, traversal is possible to situation；By aiIt is divided into 2 Ge Zi service areas ai1、
ai2；With the corresponding a of connecting valveiIn 2 nodes be end points, search power-supply system；From the beginning of any side, examination successively disconnects
Each switch on main line；If in the case of any one, calculation of tidal current meets normal running (operation) conditions, then stop and export this turn
For scheme；Otherwise, if t >=3, perform (S2-3)；If t ＜ 3, into step (S3)；
(S2-j) j connecting valve is arbitrarily closed, traversal is possible to situation；By aiIt is divided into j Ge Zi service area ai1、
ai2…aij；With the corresponding a of connecting valveiIn j node be end points, search power-supply system；Examination successively disconnects the j-1 on main line
Individual switch；If in the case of any one, calculation of tidal current meets normal running (operation) conditions, then stop and export the turning solution；
Otherwise, if t >=j+1, execution step (S2- (j+1))；If t is ＜ j+1, into step (S3)；
(S2-t) whole t connecting valves are closed；By aiIt is divided into t Ge Zi service area ai1、ai2…ait；With connecting valve
Corresponding aiIn t node be end points, search power-supply system；Examination successively disconnects t-1 switch on main line；If any one
In the case of, calculation of tidal current meets normal running (operation) conditions, then stop and export the turning solution；Otherwise, into step (S3).
Further, the step (S3) comprises the steps again：
(S3-1) whole t switches are closed；
(S3-2) with the corresponding a of t connecting valveiIn t node be end points, search power-supply system；Examination disconnects main line
On t-1 switch by aiT Ge Zi service areas are divided into, until meeting Qiant-1Ge Zi service areas at utmost using being connected
Neighbouring power supply block；
(S3-3) load being connected thereto is cut off successively according to order from small to large, when remaining load be able to meet normally
During service condition, stop and export the turning solution.
Further, each the power supply block in described several power supply blocks are in tree-shaped, load bus therein and
Power supply node is the leaf node in dendrogram, that is, remove any power supply node or load bus, and remaining part is still in tree
Shape.
Further, when the photovoltaic generating system is provided out energy as power supply, by load bus power consumption
It is labeled as 0；When the photovoltaic generating system absorbs outside energy as battery, power supply node generated output is labeled as into 0.
The beneficial effects of the present invention is：
(1) can be the region of the dead electricity because of catastrophic failure the invention provides a kind of distribution turns to supply method for searching path
Feasible turning solution is provided, the reliability of supplying power allocation is improved.
(2) present invention can export the turning solution of minimal switches action, reduce the probability of operated by personnel's error.
(3) present invention need not set up the Sample Storehouse of complexity, and amount of calculation is also less, therefore has the preferable suitability and timeliness
Property.
(4) the invention provides a kind of modeling pattern with net topology, and system is considered comprising distributed photovoltaic
Situation, can turn to provide reference for the research of association area for distribution.
Description of the drawings
Fig. 1 is that the distribution network load based on greedy algorithm turns to supply the flow chart of method for searching path；
Fig. 2 is certain power distribution network wiring diagram；
Fig. 3 is distribution network topology corresponding with Fig. 2.
Specific embodiment
The present invention is illustrated with reference to the accompanying drawings and examples.The present embodiment is with technical solution of the present invention as front
Carry and being implemented, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to it is following
Embodiment, protection scope of the present invention is still defined by claim, and those skilled in the art wait similar shapes to the various of the present invention
The modification of formula belongs to protection scope of the present invention.
For a distribution network, can by its it is abstract be the topological diagram that is made up of point set N and side collection E.According to each node
All nodes can be classified as 3 class set by heterogeneity --- power supply node collection S { si|si∈ N }, load bus collection L { lj|lj∈
N } and bus nodes collection C { ck|ck∈N}.Because bus may be considered, each point is indiscriminate, and abstract seeing is exactly one
Node.All node Unified numbers, writing represents the subscript of node property letter.Connect the side e of consecutive points on topological diagramijComprising
One switch.
Fig. 2 is certain low-voltage distribution network wiring diagram, and topological diagram as shown in Figure 3 is formed after abstract simplification.Side e in Fig. 334On
The switch that represents in corresponding line of "×" be off.According to the topological diagram of Fig. 3, it can be found that distribution can be divided into
Several power supplies block A { a1, a2..., an}.Each power supply block is in tree-shaped, and load bus therein and power supply node are equal
For the leaf node in dendrogram, that is, remove any power supply node or load bus, remaining part is still in tree-shaped.
As distributed photovoltaic power generation system proportion is increasing in distribution, in order to strengthen the suitable of invention institute extracting method
With property, with reference to real-time condition, a distributed photovoltaic power generation system in distribution can be equivalent to a power supply node plus one
Individual load bus.When the photovoltaic generating system is provided out energy as power supply, load bus power consumption can be labeled as
0；When the photovoltaic generating system absorbs outside energy as battery, power supply node generated output can be labeled as 0.Do not changing
On the premise of net topology, the method can characterize the various working conditions of distributed photovoltaic power generation system.
The greedy algorithm of the present invention includes two main process.Process one is operated not comprising cutting load, that is, find one kind not
The turning solution of power-off；If process one can not find this scheme, into process two, by cutting off a part of load, obtain
Feasible turning solution.As shown in figure 1, this method is comprised the steps of：
(1) as power supply block aiPower supply point it is out of service, search for all and aiIt is adjacent and in the area of normal power supply state
Block, and it is a to find itiTurn the connecting valve for required closure.Note can be aiTurn total for t for the adjacent power supply block of electric power.
(2) into greedy algorithm process one.One point of process is multistep, and most execution step numbers are t.
(3) step of process 1 the 1st：Arbitrarily one connecting valve of closure, travels through and is possible to situation.If any one situation
Under, calculation of tidal current meets normal running (operation) conditions, then stop and export the turning solution.Otherwise, if t >=2, implementation procedure one
2nd step；If t ＜ 2, into greedy process two.
(4) step of process 1 the 2nd.Arbitrarily two connecting valves of closure, travel through and are possible to situation.In order to avoid there is ring-type
Structure, needs aiIt is divided into 2 Ge Zi service areas ai1、ai2.With the corresponding a of connecting valveiIn 2 nodes be end points, search
Power-supply system.From the beginning of any side, examination successively disconnects each switch on main line.If in the case of any one, Load flow calculation knot
Fruit meets normal running (operation) conditions, then stop and export the turning solution.Otherwise, if t >=3, the step of implementation procedure 1 the 3rd；If t ＜ 3,
Into greedy process two.
(5) jth of process one step.Arbitrarily j connecting valve of closure, travels through and is possible to situation.In order to avoid there is ring-type
Structure, needs aiIt is divided into j Ge Zi service area ai1、ai2…aij.With the corresponding a of connecting valveiIn j node be end points,
Search power-supply system.Examination successively disconnects j-1 switch on main line.If in the case of any one, calculation of tidal current meets just
Often service condition, then stop and export the turning solution.Otherwise, if t >=j+1, the step of one jth of implementation procedure+1；If t is ＜ j+1, enter
Enter greedy process two.
(6) t of process one steps.The whole t connecting valve of closure.In order to avoid there is circulus, need aiDivide
For t Ge Zi service area ai1、ai2…ait.With the corresponding a of connecting valveiIn t node be end points, search power-supply system.Successively
Examination disconnects t-1 switch on main line.If in the case of any one, calculation of tidal current meets normal running (operation) conditions, then stop
And export the turning solution.Otherwise, into greedy process two.
(7) the greedy step of process 2 the 1st.Qualitative analyses understand, there is provided turn more for the adjacent block of electric power, dead electricity block institute
The load that need to be cut off is fewer, therefore in process two, t connecting valve is both needed to closure.
(8) the greedy step of process 2 the 2nd.With the corresponding a of t connecting valveiIn t node be end points, search power supply dry
Road.T-1 on examination disconnection main line is switched aiT Ge Zi service areas are divided into, until meeting Qiant-1Ge Zi service areas maximum journey
Degree utilizes the neighbouring power supply block for being connected.
(9) the greedy step of process 2 the 3rd.It is apparent from, last Ge Zi service area is necessarily not normally functioning.According to from small to large
Order cut off the load being connected thereto successively, when remaining load be able to meet normal running (operation) conditions, stop and export this turn
For scheme.
Embodiment：
By taking Fig. 3 as an example, the implementation process of the method provided by the present invention is explained in detail.Photovoltaic-energy-storage system in Fig. 3 is in suction
Outside energy state is received, therefore equivalent power supply node is labeled as 0.The figure can be divided into 3 power supply blocks
a1{s1,c2,c3,l8,c9,l10,l11,e1,2,e2,3,e2,8,e3,9,e9,10,e9,11}、a2{c4,C5,c6,s7,l12,l13,
l14,e4,5,e5,6,e6,7,e4,12,e5,13,e5,14}、a3{c15,l16,c17,l18,s19,e15,16,e15,17,e17,18,e17,19}.It is each negative
Lotus size and power supply node maximum size see the table below.
| l8 | l10 | l11 | l12 | |
| Load/kW | 1800 | 2000 | 2000 | 1000 |
| l13 | l14 | l16 | l18 | |
| Load/kW | 1500 | 1500 | 1500 | 2000 |
| s1 | s7 | s19 | ||
| Capacity/kW | 8000 | 7000 | 6000 |
(1) s is worked as7It is out of service for some reason, search for a2Neighbouring power supply block, have a1、a3, then t=2, connecting valve is respectively
e3,4、e6,15。
(2) greedy process one is initially entered, because t=2, two steps is at most performed.
(3) step of process 1 the 1st, closes e3,4、e6,15In any one switch.s1And s19Spare capacity be respectively
2200kW and 2500kW, and dead electricity area a2Total load is 4000kW, is apparent from the 1st step and meets normal running (operation) conditions without any situation.
(4) step of process 1 the 2nd, closes e3,4、e6,15Two switches.Search and connecting valve e3,4、e6,15Corresponding node c4、
c6Between power-supply system { e4,5,e5,6}。c6On not on-load, therefore switch e should be disconnected4,5.Due to c5Institute band total load be
3000kW, more than S19Spare capacity, then the 2nd step still meet normal running (operation) conditions without any situation.
(5) greedy process two is entered, e is closed3,4、e6,15Two switches.
(6) e is disconnected4,5, l12Sub- service area be located at utmost using a1。
(7) l is cut off13, remaining l14, last Ge Zi service area can normally run.Output turning solution { e3,4=0 → 1,
e6,15=0 → 1, e4,5=1 → 0, e5,13=1 → 0 }.Overall process terminates.
Staff operates according to output scheme to respective switch, you can completes the electric power to dead electricity region and turns to supply.
Claims (5)
1. a kind of distribution network load based on greedy algorithm turns to supply method for searching path, it is characterised in that in the process, will
It is the topological diagram being made up of point set N and side collection E that distribution network is abstract, and all nodes are classified as into power supply node collection S { si|si∈N}、
Load bus collection L { lj|lj∈ N } and bus nodes collection C { ck|ck∈ N } three class set；Connect the side e of consecutive points on topological diagramij
Comprising a switch, it is denoted as：
Distribution is divided into into several power supplies block A { a1, a2..., an}；
A distributed photovoltaic power generation system in distribution is equivalent to into a power supply node plus a load bus；
Methods described is concretely comprised the following steps：
(S1) as power supply block aiPower supply point it is out of service when, search for all and aiIt is adjacent and in the area of normal power supply state
Block, and it is a to find itiTurn the connecting valve for required closure, can be aiTurn the adjacent power supply block sum note for electric power
For t；
(S2) a kind of turning solution of not power-off is found, this process is operated not comprising cutting load；
(S3) by a part of load of excision, feasible turning solution is obtained.
2. a kind of distribution network load based on greedy algorithm according to claim 1 turns to supply method for searching path, its feature
It is：The step (S2) is multistep, and most execution step numbers are t；
The step (S2) comprises the steps again：
(S2-1) a connecting valve is arbitrarily closed, traversal is possible to situation；If in the case of any one, calculation of tidal current
Meet normal running (operation) conditions, then stop and export the turning solution；Otherwise, if t >=2, perform (S2-2)；If t ＜ 2, into step
Suddenly (S3)；
(S2-2) two connecting valves are arbitrarily closed, traversal is possible to situation；By aiIt is divided into 2 Ge Zi service areas ai1、ai2；With
The corresponding a of connecting valveiIn 2 nodes be end points, search power-supply system；From the beginning of any side, examination successively disconnects main line
On each switch；If in the case of any one, calculation of tidal current meets normal running (operation) conditions, then stop and export this and turn supplier
Case；Otherwise, if t >=3, perform (S2-3)；If t ＜ 3, into step (S3)；
(S2-j) j connecting valve is arbitrarily closed, traversal is possible to situation；By aiIt is divided into j Ge Zi service area ai1、ai2…
aij；With the corresponding a of connecting valveiIn j node be end points, search power-supply system；Successively j-1 on examination disconnection main line opens
Close；If in the case of any one, calculation of tidal current meets normal running (operation) conditions, then stop and export the turning solution；Otherwise,
If t >=j+1, execution step (S2- (j+1))；If t is ＜ j+1, into step (S3)；
(S2-t) whole t connecting valves are closed；By aiIt is divided into t Ge Zi service area ai1、ai2…ait；It is corresponding with connecting valve
aiIn t node be end points, search power-supply system；Examination successively disconnects t-1 switch on main line；If any one situation
Under, calculation of tidal current meets normal running (operation) conditions, then stop and export the turning solution；Otherwise, into step (S3).
3. a kind of distribution network load based on greedy algorithm according to claim 1 turns to supply method for searching path, its feature
It is：The step (S3) comprises the steps again：
(S3-1) whole t switches are closed；
(S3-2) with the corresponding a of t connecting valveiIn t node be end points, search power-supply system；Examination disconnects the t- on main line
1 switchs aiT Ge Zi service areas are divided into, until meeting Qiant-1Ge Zi service areas connected neighbouring is at utmost utilized
Power supply block；
(S3-3) load being connected thereto is cut off successively according to order from small to large, when remaining load be able to meet normal operation
During condition, stop and export the turning solution.
4. a kind of distribution network load based on greedy algorithm according to claim 1 turns to supply method for searching path, its feature
It is：In tree-shaped, load bus therein and power supply node are each power supply block in described several power supply blocks
Leaf node in dendrogram, that is, remove any power supply node or load bus, and remaining part is still in tree-shaped.
5. a kind of distribution network load based on greedy algorithm according to claim 1 turns to supply method for searching path, its feature
It is：When the photovoltaic generating system is provided out energy as power supply, load bus power consumption is labeled as into 0；Work as institute
When stating photovoltaic generating system as battery absorption outside energy, power supply node generated output is labeled as into 0.
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| CN110011410A (en) * | 2019-03-01 | 2019-07-12 | 国网浙江杭州市富阳区供电有限公司 | A kind of power network line based on big data turns for state monitoring method |
| CN110212539A (en) * | 2019-05-27 | 2019-09-06 | 上海工程技术大学 | A kind of load transfer method and device improving distribution network reliability |
| CN111753385A (en) * | 2020-07-03 | 2020-10-09 | 石家庄科林电气股份有限公司 | Power supply searching method based on water flow path simulating algorithm |
| CN111753385B (en) * | 2020-07-03 | 2023-07-25 | 石家庄科林电气股份有限公司 | Power supply searching method based on water flow path simulating algorithm |
| CN113469432A (en) * | 2021-06-29 | 2021-10-01 | 海南电网有限责任公司三亚供电局 | Distribution network transfer intelligent analysis auxiliary method |
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