CN106571622A - Method for evaluating reliability of distribution network based on traversal algorithm and component hierarchy - Google Patents

Method for evaluating reliability of distribution network based on traversal algorithm and component hierarchy Download PDF

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Publication number
CN106571622A
CN106571622A CN201510647199.1A CN201510647199A CN106571622A CN 106571622 A CN106571622 A CN 106571622A CN 201510647199 A CN201510647199 A CN 201510647199A CN 106571622 A CN106571622 A CN 106571622A
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formula
switch
lambda
reliability
fuse
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杨清
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Yunnan Power Grid Co Ltd
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Yunnan Power Grid Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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Abstract

The invention discloses a method for evaluating the reliability of a distribution network based on a traversal algorithm and a component hierarchy. The method is characterized by dividing distribution system blocks by using a circuit breaker or an isolating switch as a boundary element and a breadth traversal algorithm given in the invention, and correcting block reliability data by considering the reliable fusing of a fuse; and searching the operation position of a protection switch by using a switch level matrix of the invention; and analyzing a load fault type by using the accessibility matrix of the graph theory, compensating the influence of a load branch where a fuse load is located so as to calculate a reliability index. The method uses the breadth traversal algorithm and the switch-level matrix to avoid repeated network topology search, thus greatly improving the reliability of the distribution network reliability calculation.

Description

It is a kind of based on ergodic algorithm and the distribution network reliability evaluation method of element level
Technical field
The invention belongs to reliability evaluation technical field, more particularly, to a kind of based on traversal The distribution network reliability evaluation method of algorithm and element level.
Background technology
Distribution Power System Reliability is the important measure index of power system power supply ability, Electric Power Network Planning and is changed Reliability assessment will be carried out during making, it is distribution system optimization accurately quickly to carry out reliability assessment The basis of planning.There is network size greatly in current Reliability Evaluation Algorithm and repeat search is calculated and led The problem for causing computational efficiency low, and the calculating speed utility model and algorithm good to one is extremely important.
Because the computational accuracy of simulation method is directly proportional to the calculating time, the distribution system adopted in engineering can It is analytic method by property appraisal procedure.It sets up failure effect pattern table by enumerating all element faults, Calculate reliability index.But actual distribution system is in large scale, distribution being caused Fault enumeration quantity more Reliability evaluation difficulty is big, efficiency is low.
The content of the invention
The present invention mainly solves the repeat search existing for existing reliability estimation method and calculates and count Calculate the low technical problem of efficiency；There is provided a kind of simplified reliability assessment process so as to greatly improving distribution Reliability evaluation speed based on ergodic algorithm and the reliability evaluation side of element level Method.
What the above-mentioned technical problem of the present invention was mainly addressed by following technical proposals：
It is a kind of based on ergodic algorithm and the Evaluation Method of Distribution Systems Reliability of element level, be applied to meter Distribution Power System Reliability index is calculated, using following steps distribution Power System Reliability calculating is carried out：
Step 1, with chopper or disconnecting switch as boundary element, by breadth traversal algorithm distribution is set up System element piecemeal, and piecemeal fault rate and trouble duration are calculated, as shown in formula one；
Formula one；
In formula one, λi、riThe fault rate and trouble duration of element i respectively in piecemeal；λs、rsRespectively The equivalent fault rate of block s and equivalent fault persistent period；N represents element total number；
Step 2, if the probability that fuse reliably fuses is p, then eliminates the fusing of fuse reliability to block ginseng Several impact, as shown in formula two；
Formula two；
In formula two, λj、rjRespectively there are the fault rate and trouble duration of fuse load branch circuit element j； λs1、rs1Respectively eliminate the equivalent fault rate of block s and equivalent fault persistent period after fuse affects；m Represent in piecemeal s there is fuse load branch circuit component population；
Step 3, sets up the equivalent branch road connection matrix of distribution system after piecemeal, and annexation is as shown in formula three；
Formula three
In formula three, ei、ejRepresent distribution system branch road；gijRepresent branch road annexation；
Step 4, with main feeder grade as 1 feeder line grade, element etc. on same grade feeder line are divided successively Level is identical, and connects one-level feeder line head end according to same grade feeder line number homophase (near main power source side) The distance of distance is numbered to feeder line；
Step 5, with main feeder head end chopper level as 1, keeps distribution system tree, according to Switch from the close-by examples to those far off sets up switch level with main power source distance after subregion；
Step 6, the type and position according to fault element, search switch level matrix, staged search Isolate the circuit breaker position of big area fault and the position of the switch of zonule failure；
Step 7, the switch of protection act and calculates accessibility square in disconnected branches connection matrix stage by stage Battle array, judges negative by the equivalent branch road of load place subregion with the annexation of main power source and stand-by power supply The fault type of lotus, compensation has the impact of fuse load place load branch circuit element, calculates reliability Index.
The invention has the advantages that：Complicated distribution is converted into simply using breadth traversal algorithm Radial distribution system, and the position of protection act is directly searched using switch level matrix, by electricity Source reachability result analysis load fault type calculates reliability index, and repetition traverses network can be avoided to open up Flutter, so as to substantially increase the efficiency of distribution network reliability calculating.
Description of the drawings
Fig. 1 is example topological diagram involved in the present invention.
Specific embodiment
Below by the embodiment of accompanying drawing, technical scheme is described in further detail.
The present invention provides a kind of based on ergodic algorithm and the reliability evaluation side of element level Method, is applied to calculate distribution Power System Reliability index, and using following steps distribution Power System Reliability is carried out Calculate：
Step 1, with chopper or disconnecting switch as boundary element, by breadth traversal algorithm distribution is set up System element piecemeal, and piecemeal fault rate and trouble duration are calculated, as shown in formula one；
Formula one；
In formula one, λi、riThe fault rate and average time for repair of breakdowns of element i respectively in piecemeal；λs、rsPoint Not Wei block s equivalent fault rate and equivalent fault repair time；N represents element total number；
Step 2, if the probability that fuse reliably fuses is p, then eliminates the fusing of fuse reliability to block ginseng Several impact, as shown in formula two；
Formula two；
In formula two, λj、rjRespectively there are the fault rate and trouble duration of fuse load branch circuit element j；λs1、 rs1Respectively eliminate the equivalent fault rate of block s and equivalent fault repair time after fuse affects；M tables Show and have in piecemeal s fuse load branch circuit component population；
Step 3, sets up the equivalent branch road connection matrix of distribution system after subregion, and annexation is as shown in formula three.
Formula three
In formula three, ei、ejRepresent distribution system branch road；gijRepresent branch road annexation；
Step 4, with main feeder grade as 1 feeder line grade, component level phase on same grade feeder line are divided Together, and according to same grade feeder line number homophase connect one-level feeder line head end (near main power source side) away from From distance feeder line is numbered；
Step 5, with main feeder head end chopper level as 1, keeps distribution system tree, according to Switch from the close-by examples to those far off sets up switch level, the switch level matrix such as institute of formula four with main power source distance after subregion Show；
Formula four
In formula four, first row representation switch type：" 1 " represents chopper, and " 2 " represent disconnecting switch, " 3 " Interconnection switch is represented, second is classified as switching branches numbering, and the 3rd is classified as switch grade, and the 4th is classified as out Place feeder line numbering is closed, the 5th is classified as switch level；
Step 6, the type and position according to fault element, search switch level matrix, search isolation is big The circuit breaker position of area fault and the position of the switch of zonule failure；
Step 7, the switch of protection act and calculates accessibility square in disconnected branches connection matrix stage by stage Battle array, judges negative by the equivalent branch road of load place subregion with the annexation of main power source and stand-by power supply The fault type of lotus, compensation has the impact of fuse load place load branch circuit element, calculates reliability Index；
Table 1 gives system electrical component reliability data, if the action message of chopper 100%, isolation The switching time of switch and interconnection switch is 1h.Standard reliability test is calculated using the inventive method The subsystem of the feeder line F4 in example IEEE-RBTSBus6～F7 compositions carries out reliability assessment for example, Result of calculation is as shown in table 2 and table 3.
The system element reliability data of table 1
Table 2IEEE-RBTSBus6 Reliability Indexes
Note：SAIFI is system System average interruption frequency index, times/year；SAIDI be system System average interruption duration index, h/； CAIDI be user's System average interruption duration index, h/；ASAI is average Availability Index；EENS is supplied to expect to lack Electric energy figureofmerit, MWh/.
The typical examples of table 3 calculate the time
From table 2 and table 3 as can be seen that commenting reliability is carried out to IEEE-RBTSBus6 bus-bar systems When estimating, the inventive method can obtain accurate result of calculation, and substantially increase computational efficiency.
Specific embodiment described herein is only explanation for example spiritual to the present invention.The present invention Person of ordinary skill in the field described specific embodiment can be made it is various modification or Supplement or substituted using similar mode, but without departing from the spiritual of the present invention or surmount appended power Scope defined in sharp claim.

Claims (1)

1. a kind of based on ergodic algorithm and the Evaluation Method of Distribution Systems Reliability of element level, application In distribution Power System Reliability index is calculated, using following steps distribution Power System Reliability meter is carried out Calculate：
Step 1, with chopper or disconnecting switch as boundary element, is built by breadth traversal algorithm Vertical power distribution system components piecemeal, and piecemeal fault rate and trouble duration are calculated, such as the institute of formula one Show.
λ s = Σ i = 1 n λ i r s = Σ i = 1 n λ i r i Σ i = 1 n λ i Formula one；
In formula one, λi、riThe fault rate and average time for repair of breakdowns of element i respectively in piecemeal；λs、 rsRespectively the equivalent fault rate of block s and equivalent fault repair time；N represents element total number；
Step 2, if the probability that fuse reliably fuses is p, then eliminates fuse and reliably fuses Impact to block parameter, as shown in formula two；
λ s 1 = λ s - p Σ j = 1 m λ j r s 1 = r s λ s - p Σ j = 1 m λ j r j λ s 1 Formula two；
In formula two, λj、rjWhen respectively having the fault rate and failure of fuse load branch circuit element to continue Between；λs1、rs1Respectively eliminating fuse affects equivalent fault rate and the equivalent fault reparation of block s Time；M is represented fuse load branch circuit component population in piecemeal s；
Step 3, sets up the equivalent branch road connection matrix of distribution system after piecemeal, annexation such as formula Shown in three；
Formula three
In formula three, ei、ejRepresent distribution system branch road；gijRepresent branch road annexation；
Step 4, divides successively feeder line grade, on same grade feeder line with main feeder grade as 1 Component level is identical, and connects one-level feeder line head end according to same grade feeder line number homophase The distance of (near main power source side) distance is numbered to feeder line；
Step 5, with main feeder head end chopper level as 1, keeps distribution system tree, Switch level is from the close-by examples to those far off set up with main power source distance according to switch after subregion；
Step 6, the type and position according to fault element, search switch level matrix, sublevel The circuit breaker position of the big area fault of section search isolation and the position of the switch of zonule failure；
Step 7, the switch of protection act and calculates reachable in disconnected branches connection matrix stage by stage Property matrix, closed with the connection of main power source and stand-by power supply by the equivalent branch road of load place subregion System judges the fault type of load, compensates the impact of fuse load place load branch circuit element, Calculate reliability index.
CN201510647199.1A 2015-10-09 2015-10-09 Method for evaluating reliability of distribution network based on traversal algorithm and component hierarchy Pending CN106571622A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106990354A (en) * 2017-05-27 2017-07-28 西安科技大学 A kind of trip breaker self-adapted search method based on dijkstra's algorithm
CN115221468A (en) * 2022-09-14 2022-10-21 天津大学 Method, system, server and terminal for analyzing and calculating reliability index of power distribution network

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102222907A (en) * 2011-06-09 2011-10-19 重庆大学 Distribution network reliability evaluation method applicable to multi-circuit identical-pole line construction
CN103259265A (en) * 2013-06-06 2013-08-21 山东大学 Power network partitioning and detached island identification method of intelligent power distribution network based on reachability matrix
CN103824234A (en) * 2014-03-18 2014-05-28 国家电网公司 Blocking and hierarchical structure based power distribution system reliability evaluation method
CN103855707A (en) * 2014-02-20 2014-06-11 深圳供电局有限公司 Power supply reliability assessment method of power distribution network comprising distributed power supply
CN104462767A (en) * 2014-11-05 2015-03-25 广东电网有限责任公司江门供电局 Rapid power distribution network reliability assessment method based on element transfer characteristics

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102222907A (en) * 2011-06-09 2011-10-19 重庆大学 Distribution network reliability evaluation method applicable to multi-circuit identical-pole line construction
CN103259265A (en) * 2013-06-06 2013-08-21 山东大学 Power network partitioning and detached island identification method of intelligent power distribution network based on reachability matrix
CN103855707A (en) * 2014-02-20 2014-06-11 深圳供电局有限公司 Power supply reliability assessment method of power distribution network comprising distributed power supply
CN103824234A (en) * 2014-03-18 2014-05-28 国家电网公司 Blocking and hierarchical structure based power distribution system reliability evaluation method
CN104462767A (en) * 2014-11-05 2015-03-25 广东电网有限责任公司江门供电局 Rapid power distribution network reliability assessment method based on element transfer characteristics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106990354A (en) * 2017-05-27 2017-07-28 西安科技大学 A kind of trip breaker self-adapted search method based on dijkstra's algorithm
CN106990354B (en) * 2017-05-27 2019-03-19 西安科技大学 A kind of trip breaker self-adapted search method based on dijkstra's algorithm
CN115221468A (en) * 2022-09-14 2022-10-21 天津大学 Method, system, server and terminal for analyzing and calculating reliability index of power distribution network

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