CN111244879A - X time limit setting method and system for in-situ feeder automation terminal - Google Patents
X time limit setting method and system for in-situ feeder automation terminal Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
An X time limit setting method and system for an in-situ feeder automation terminal comprises the following steps: based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence; determining the X time limit of each node according to the access sequence and a preset delay time; and switching on according to the X time limit of each node. According to the method and the system provided by the invention, the X time limit of the node switch terminal on the column is set through a depth-first-based search algorithm, the requirement of the main line for first power restoration can be met, and only a single section switch is switched on at any time in the reclosing and power transmission process of the breaker, so that fault positioning is effectively supported.
Description
Technical Field
The invention relates to the technical field of distribution automation, in particular to an X time limit setting method and system for an on-site feeder automation terminal.
Background
In order to reduce the power failure range during fault and maintenance and improve the power supply reliability, a section switch is generally installed on a distribution line (feeder). Because the distribution lines are short, the short-circuit current phase difference of different places is not large during fault, the number of the section switches is more, generally 3-5, in order to simplify a protection system and reduce investment, protection is not generally configured for the section switches, the circuit faults are cut off by a protection device of an outlet circuit breaker of a line substation, then corrective operation is carried out by a feeder line automatic system, a fault section is positioned and isolated, then power supply of a non-fault section is recovered, and the fault power failure range is reduced.
As for the effect of reducing the power failure range of the power distribution network, relay protection is the first defense line, and feeder automation is used as a supplementary measure of the relay protection and is the second defense line. The relay protection of the power distribution network is relatively simple in configuration, the action of the relay protection is difficult to have absolute selectivity, the condition that the fault power failure range is enlarged inevitably occurs, measures need to be taken to isolate a fault section and recover the power supply of a non-fault section, and the fault power failure range is limited to be as small as possible.
Feeder automation can avoid or reduce the power failure loss that medium voltage distribution line trouble brought for the user, improves and joins in marriage net power supply reliability, is an important distribution network self-healing control technique, has the position of putting the weight of in distribution automation technique, plays important effect to security, reliability and the economic nature that improves the distribution network power supply. Overhead lines are the main form of power distribution networks, especially in small towns and villages. However, feeder automation is not reasonably set, and cannot be correctly operated by matching with a distribution switch, and the superior performance of feeder automation cannot be realized.
Disclosure of Invention
The invention provides an X time limit setting method and system of an on-site feeder automation terminal, and aims to solve the problems that feeder automation is lack of reasonable setting and cannot be matched with a distribution switch to operate correctly in the prior art.
The technical scheme provided by the invention is as follows: an X time limit setting method of an in-situ feeder automation terminal comprises the following steps:
based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence;
determining the X time limit of each node according to the access sequence and a preset delay time;
and switching on according to the X time limit of each node.
Preferably, the accessing the node switch according to a policy of a trunk line before a branch line from the outgoing line breaker based on the topology structure to obtain an access sequence includes:
determining a to-be-accessed side according to a search strategy of a main line and a branch line on the basis of a node switch started by a circuit breaker;
and accessing the switching node of the topological structure according to the edge to be accessed to obtain an access sequence.
Preferably, the determining, by the node switch based on the circuit breaker, an edge to be accessed according to a search policy of a branch line after the line trunk line includes:
accessing and marking the outgoing line node switches of the topological structure, and searching adjacent node switches according to a search strategy of a trunk line and a branch line;
if the adjacent switch nodes exist, forming a to-be-accessed edge, and performing access judgment on the to-be-accessed edge; otherwise, ending the traversal of the current node.
Preferably, the accessing the switch node of the topology structure according to the edge to be accessed to obtain an access sequence includes:
judging whether the node switch on the edge to be accessed is accessed;
if the current access edge is not accessed, accessing and marking the current access edge to obtain an access sequence number; otherwise, returning to the father node switch of the current node, and searching the adjacent node switch;
and repeating the steps until the node switch of the topological structure is visited, and obtaining a visiting sequence.
Preferably, the determining the X time limit of each node according to the access sequence and a preset delay time includes:
obtaining the absolute closing time of the node switch based on the access sequence and a preset delay time;
and obtaining the X time limit of the node switch sequence based on the absolute closing time of the node switch.
Preferably, the absolute closing time of the node switch is obtained based on the access sequence and a preset delay time, and is shown as follows:
ti＝i·ΔT
wherein, tiAnd the absolute closing time of the switch node i is, i is the serial number of the switch node in the access sequence, and delta T is a preset delay time length.
Preferably, the predetermined delay time Δ T is 7 seconds or 14 seconds.
Preferably, the obtaining the X time limit of the node switch sequence based on the absolute closing time of the node switch includes:
acquiring the absolute closing time of a father node switch of the node switch;
and obtaining the X time limit of the node switch according to the absolute closing time of the node switch and the absolute closing time of the father node switch of the node switch.
Preferably, the calculation formula of the X time limit of the node switch is as follows:
Xi＝ti-tj
wherein, XiFor switching X time limit, t, of node iiIs the absolute closing time, t, of the switching node ijThe absolute closing time of the parent node switch j of the node switch i.
Preferably, the switching on according to the X time limit of each node includes:
switching on a node switch according to the electrical direction of the topological structure, and simultaneously switching on the node switch by taking the corresponding X time limit as countdown when a sub-node switch of the node switch enters a state to be switched on;
and repeating the steps until all the switching nodes are switched on.
A time limit setting system of an in-place feeder automation terminal, comprising:
an access module: based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence;
an X time limit calculation module: determining the X time limit of each node according to the access sequence and a preset delay time;
a closing module: and switching on according to the X time limit of each node.
Preferably, the access module includes:
and accessing an edge search submodule: determining a to-be-accessed side according to a search strategy of a main line and a branch line on the basis of a node switch started by a circuit breaker;
accessing a sequence acquisition submodule: and accessing the switching node of the topological structure according to the edge to be accessed to obtain an access sequence.
Preferably, the access edge search sub-module includes:
a search unit: accessing and marking the outgoing line node switches of the topological structure, and searching adjacent node switches according to a search strategy of a trunk line and a branch line;
an access unit: if the adjacent switch nodes exist, forming a to-be-accessed edge, and performing access judgment on the to-be-accessed edge; otherwise, ending the traversal of the current node.
Compared with the prior art, the invention has the beneficial effects that: the technical scheme provided by the invention comprises the following steps: based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence; determining the X time limit of each node according to the access sequence and a preset delay time; and switching on according to the X time limit of each node. According to the invention, feeder automation and X time limit setting are combined, so that the feeder automation is matched with the distribution switch to carry out correct operation.
According to the technical scheme provided by the invention, on the basis of a depth-first search algorithm, node switches on a main line and a branch line are searched and are subjected to X time limit sequencing, and only one column switch can be switched on at any time, so that the engineering effects that the main line is subjected to power restoration first and the branch line is subjected to power restoration later in the reclosing and power transmission process of a circuit breaker are realized, the circuit fault can be accurately positioned, and the fault removal inaccuracy is reduced.
Drawings
FIG. 1 is a flow chart of an X time limit setting method of an in-situ feeder automation terminal according to the present invention;
FIG. 2 is a diagram illustrating a process for determining an X time limit setting method of an in-situ feeder automation terminal according to the present invention;
fig. 3 is a feeder topology diagram of an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
Example 1:
as shown in fig. 1 and fig. 2, an X time limit setting method for an in-situ feeder automation terminal provided by the present invention includes:
s1: based on a topological structure, the node switch is accessed according to a strategy of firstly accessing the trunk line and then accessing the branch line from the outgoing line breaker to obtain an access sequence.
And determining the closing time interval delta T of the adjacent section switches. In general, there are two types, i.e., a short time interval Δ T of 7s and a long time interval Δ T of 14 s.
Starting from the outgoing breaker, the adjacent section switch is accessed and marked as accessed.
And searching each adjacent switch node from the switch node in turn according to the principle of 'leading the main line and then leading the branch line'.
Let x be the currently accessed switch node, mark x as accessed, select a slave switch niThe starting, unvisited edge (x, y).
S2: and determining the X time limit of each node according to the access sequence and the preset delay time. If the node is foundyIf the edge is visited, another undetected edge starting from x is reselected, otherwise, y is visited along the edge (x, y) and marked as visited. Then starting to search from y until the search is finished from njAll paths from, i.e. having accessed all slavesyAfter the reachable node starts, the x is traced back, and a node from n is selectediUndetected edges of departure.
The above process is performed until all edges from which x starts have been visited.
At this time, if x is not the node of the outlet switch, backtracking to the node which x was accessed before; otherwise, all nodes of the topological graph which are communicated with the switch node in a path are accessed, and the traversal process is finished.
According to the access sequence willAll switch terminals of the feeder are numbered (n)1,n2,n3,L nn)。
According to the sequence of each section switch, the absolute closing delay time is calculated by taking Delta T as an interval sequence to increase, and the absolute closing time of the ith switch is Ti＝i·ΔT。
The X time of any ith switch is the absolute closing delay time minus the absolute closing delay time X of the father nodei＝ti-tj. Where the j switch is the parent node of the i switch. And the father node represents that the switch j is switched on, and the switch i is electrified to start X time delay.
S3: and switching on according to the X time limit of each node.
Example 2:
based on the same invention idea, the invention also provides an X time limit setting system of the on-site feeder automation terminal, which comprises
An access module: based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence;
an X time limit calculation module: determining the X time limit of each node according to the access sequence and a preset delay time;
a closing module: and switching on according to the X time limit of each node.
The access module includes:
and accessing an edge search submodule: determining a to-be-accessed side according to a search strategy of a main line and a branch line on the basis of a node switch started by a circuit breaker;
accessing a sequence acquisition submodule: and accessing the switching node of the topological structure according to the edge to be accessed to obtain an access sequence.
The access edge search submodule comprises:
a search unit: accessing and marking the outgoing line node switches of the topological structure, and searching adjacent node switches according to a search strategy of a trunk line and a branch line;
an access unit: if the adjacent switch nodes exist, forming a to-be-accessed edge, and performing access judgment on the to-be-accessed edge; otherwise, ending the traversal of the current node.
The access sequence acquisition sub-module comprises:
a judging unit: judging whether the node switch on the edge to be accessed is accessed;
if the current access edge is not accessed, accessing and marking the current access edge to obtain an access sequence number; otherwise, returning to the father node switch of the current node, and searching the adjacent node switch;
an access sequence acquisition unit: and repeating the steps until the node switch of the topological structure is visited, and obtaining a visiting sequence.
The X time limit calculation module comprises:
and an absolute closing time calculation submodule: obtaining the absolute closing time of the node switch based on the access sequence and a preset delay time;
an X time limit calculation submodule: and obtaining the X time limit of the node switch sequence based on the absolute closing time of the node switch.
The absolute closing time calculation submodule calculates absolute closing time as shown in the following formula:
ti＝i·ΔT
wherein, tiAnd the absolute closing time of the switch node i is, i is the serial number of the switch node in the access sequence, and delta T is a preset delay time length.
The preset delay time Δ T is 7 seconds or 14 seconds.
The X time limit calculation submodule comprises:
a father node absolute closing time obtaining unit: acquiring the absolute closing time of a father node switch of the node switch;
an X time limit acquisition unit: and obtaining the X time limit of the node switch according to the absolute closing time of the node switch and the absolute closing time of the father node switch of the node switch.
The X time limit of the node switch is calculated in the X time limit acquisition unit, and the X time limit is shown as the following formula:
Xi＝ti-tj
wherein, XiFor switching X time limit, t, of node iiIs the absolute closing time, t, of the switching node ijThe absolute closing time of the parent node switch j of the node switch i.
The closing module includes:
timing closing submodule: switching on a node switch according to the electrical direction of the topological structure, and simultaneously switching on the node switch by taking the corresponding X time limit as countdown when a sub-node switch of the node switch enters a state to be switched on;
and the full-closing submodule repeats the steps until all the switching nodes are closed.
Example 3:
generally, a main line branch is firstly switched on, a switch which is firstly switched on is set to be 7s, other branches need to be switched on after all switches of the branch which is firstly switched on are switched on, and the X time limit setting process of the feeder line is as follows:
according to the depth-first traversal algorithm, as shown in fig. 3, if the switching-on sequence of the middle switch is a-B-C-D-E-F, the switches are numbered as follows: (n)1,n2,n3,n4,n5,n6,n7)。
Calculating the absolute closing time of each switch: t is tA＝1*7s＝7s；tB＝2*7s＝14s；tC＝3*7s＝21s；tD＝4*7s＝28s；tE＝5*7s＝35s；tG＝6*7s＝42s。
Calculating the X time limit of each switch:
XA＝1*7s＝7s；XB＝(2-1)*7s＝7s；Xc＝(3-2)*7s＝7s；XD＝(4-3)*7s＝7s；
XE＝(5-2)*7s＝21s；XF＝(6-1)*7s＝35s；XG＝(7-6)*7s＝7s
it is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (13)
1. An X time limit setting method of an in-situ feeder automation terminal is characterized by comprising the following steps:
based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence;
determining the X time limit of each node according to the access sequence and a preset delay time;
and switching on according to the X time limit of each node.
2. The method of claim 1, wherein the topology-based accessing of the node switches according to the policy of the trunk line before the branch line from the outgoing line breaker to obtain the access sequence comprises:
determining a to-be-accessed side according to a search strategy of a main line and a branch line on the basis of a node switch started by a circuit breaker;
and accessing the switching node of the topological structure according to the edge to be accessed to obtain an access sequence.
3. The method of claim 2, wherein the determining the edge to be accessed according to the search strategy of the branch line after the line trunk line based on the node switch starting from the breaker comprises:
accessing and marking the outgoing line node switches of the topological structure, and searching adjacent node switches according to a search strategy of a trunk line and a branch line;
if the adjacent switch nodes exist, forming a to-be-accessed edge, and performing access judgment on the to-be-accessed edge; otherwise, ending the traversal of the current node.
4. The method of claim 2, wherein the accessing the switching node of the topology according to the edge to be accessed to obtain an access sequence comprises:
judging whether the node switch on the edge to be accessed is accessed;
if the current access edge is not accessed, accessing and marking the current access edge to obtain an access sequence number; otherwise, returning to the father node switch of the current node, and searching the adjacent node switch;
and repeating the steps until the node switch of the topological structure is visited, and obtaining a visiting sequence.
5. The method of claim 1, wherein determining the X time limit for each node according to the access sequence and a predetermined delay duration comprises:
obtaining the absolute closing time of the node switch based on the access sequence and a preset delay time;
and obtaining the X time limit of the node switch sequence based on the absolute closing time of the node switch.
6. The method of claim 5, wherein the absolute closing time of the node switch is obtained based on the access sequence and a predetermined delay time, as shown in the following formula:
ti＝i·ΔT
wherein, tiAnd the absolute closing time of the switch node i is, i is the serial number of the switch node in the access sequence, and delta T is a preset delay time length.
7. The method of claim 6,
the preset delay time Δ T is 7 seconds or 14 seconds.
8. The method of claim 5, wherein the deriving the X time limit for the sequence of node switches based on an absolute closing time of the node switches comprises:
acquiring the absolute closing time of a father node switch of the node switch;
and obtaining the X time limit of the node switch according to the absolute closing time of the node switch and the absolute closing time of the father node switch of the node switch.
9. The method of claim 8, wherein the X time limit for the node switch is calculated as follows:
Xi＝ti-tj
wherein, XiFor switching X time limit, t, of node iiIs the absolute closing time, t, of the switching node ijThe absolute closing time of the parent node switch j of the node switch i.
10. The method of claim 1, wherein the switching on according to the X time limit of each node comprises:
switching on a node switch according to the electrical direction of the topological structure, and simultaneously switching on the node switch by taking the corresponding X time limit as countdown when a sub-node switch of the node switch enters a state to be switched on;
and repeating the steps until all the switching nodes are switched on.
11. A time limit setting system of an in-place feeder automation terminal, comprising:
an access module: based on a topological structure, starting from an outgoing line breaker, accessing a node switch according to a strategy of a main line before a branch line to obtain an access sequence;
an X time limit calculation module: determining the X time limit of each node according to the access sequence and a preset delay time;
a closing module: and switching on according to the X time limit of each node.
12. The system of claim 11, wherein the access module comprises:
and accessing an edge search submodule: determining a to-be-accessed side according to a search strategy of a main line and a branch line on the basis of a node switch started by a circuit breaker;
accessing a sequence acquisition submodule: and accessing the switching node of the topological structure according to the edge to be accessed to obtain an access sequence.
13. The system of claim 12, wherein the access edge search submodule comprises:
a search unit: accessing and marking the outgoing line node switches of the topological structure, and searching adjacent node switches according to a search strategy of a trunk line and a branch line;
an access unit: if the adjacent switch nodes exist, forming a to-be-accessed edge, and performing access judgment on the to-be-accessed edge; otherwise, ending the traversal of the current node.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185300A (en) * | 2011-05-24 | 2011-09-14 | 安徽中兴继远信息技术有限公司 | On-spot feeder automation equipment and realizing method thereof |
| CN202084917U (en) * | 2011-05-24 | 2011-12-21 | 安徽中兴继远信息技术有限公司 | In-situ feeder automation device |
| CN106300285A (en) * | 2016-08-04 | 2017-01-04 | 国家电网公司 | It is independent of the self adaptation type feeder automation fault handling method on the spot of network topology |
| CN106786425A (en) * | 2017-01-16 | 2017-05-31 | 中国电力科学研究院 | A kind of coincidence formula failure separation method and system on the spot |
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2018
- 2018-11-29 CN CN201811443693.6A patent/CN111244879B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185300A (en) * | 2011-05-24 | 2011-09-14 | 安徽中兴继远信息技术有限公司 | On-spot feeder automation equipment and realizing method thereof |
| CN202084917U (en) * | 2011-05-24 | 2011-12-21 | 安徽中兴继远信息技术有限公司 | In-situ feeder automation device |
| CN106300285A (en) * | 2016-08-04 | 2017-01-04 | 国家电网公司 | It is independent of the self adaptation type feeder automation fault handling method on the spot of network topology |
| CN106786425A (en) * | 2017-01-16 | 2017-05-31 | 中国电力科学研究院 | A kind of coincidence formula failure separation method and system on the spot |
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