CN111244879B - X-limit setting method and system for in-situ feeder automation terminal - Google Patents
X-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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- 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-limit setting method and system of an in-situ feeder automation terminal, comprising: based on the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence; determining the X time limit of each node according to the access sequence and the preset time delay time length; 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 the depth-first search algorithm, so that the requirement of primary power restoration of a main line can be met, and in the process of power restoration and power transmission of a circuit breaker, only a single sectional switch is switched on at any moment, thereby effectively supporting fault positioning.
Description
Technical Field
The invention relates to the technical field of power distribution automation, in particular to an X-limit setting method and system of an in-situ feeder automation terminal.
Background
In order to reduce the power failure range during fault and maintenance and improve the power supply reliability, a sectional switch is generally arranged on a distribution line (feeder line). Because the distribution line is shorter, the short-circuit current of different places is not great when in fault, the number of the sectionalized switches is more, generally 3-5, in order to simplify a protection system and reduce investment, protection is generally not configured for the sectionalized switches, but a protection device of an outlet breaker of a line transformer substation is relied on to cut off line faults, then a feeder automation system performs corrective operation, positions and isolates fault sections, then power supply of non-fault sections is recovered, and the fault power failure range is reduced.
In terms of the effect of reducing the power distribution network fault and power failure range, relay protection is a first defense line, and feeder automation is a second defense line as a supplementary measure of relay protection. The relay protection of the distribution network is relatively simple in configuration, the action of the relay protection is difficult to have absolute selectivity, the situation that the fault power failure range is enlarged inevitably occurs, measures are needed to isolate the fault section and restore the power supply of the non-fault section, and the fault power failure range is limited in a range as small as possible.
The feeder automation can avoid or reduce power failure loss brought by medium-voltage distribution line faults to users, improves distribution network power supply reliability, is an important distribution network self-healing control technology, has important roles in distribution automation technology, and plays an important role in improving the safety, reliability and economy of distribution network power supply. Overhead lines are the primary form of power supply for distribution networks, particularly small town and rural distribution networks. However, feeder automation lacks reasonable arrangement, cannot be matched with a distribution switch to perform correct operation, 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 in-situ feeder automation terminal, which are used for solving the problem that feeder automation in the prior art lacks reasonable setting and cannot be matched with a power distribution switch to perform correct operation.
The technical scheme provided by the invention is as follows: an X-limit setting method of an in-situ feeder automation terminal, comprising:
based on the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence;
Determining the X time limit of each node according to the access sequence and the preset time delay time length;
and switching on according to the X time limit of each node.
Preferably, the accessing the node switch based on the topology structure from the outgoing line breaker according to the strategy of the branch line after the main line to obtain the access sequence includes:
Determining an edge to be accessed according to a searching strategy of a trunk line and a branch line based on a node switch of a breaker;
And accessing the switch nodes of the topological structure according to the edges to be accessed to obtain an access sequence.
Preferably, the determining the to-be-accessed edge according to the searching strategy of the branch line behind the line main line by the node switch based on the starting of the circuit breaker includes:
accessing and marking the outgoing node switch of the topological structure, and searching for adjacent node switches according to a searching strategy of a branch line after a main line;
if adjacent switch nodes exist, forming an edge to be accessed, and performing access judgment on the edge to be accessed; otherwise, the traversal of the current node is ended.
Preferably, the accessing the switching node of the topology structure according to the to-be-accessed edge to obtain an access sequence includes:
judging whether the node switch on the side to be accessed is accessed or not;
if the access sequence number is not accessed, accessing and marking the current side to be accessed to obtain the access sequence number; otherwise, returning to the parent node switch of the current node, and searching for the adjacent node switch;
repeating the steps until the node switch of the topological structure is accessed, and obtaining an access sequence.
Preferably, the determining the X time limit of each node according to the access sequence and the preset delay time length includes:
Based on the access sequence and a preset time delay time, obtaining the absolute closing time of the node switch;
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 time delay time, and is shown in the following formula:
ti＝i·ΔT
Wherein T i is the absolute closing time of the switch node i, i is the sequence number of the switch node in the access sequence, and Δt is the preset delay time.
Preferably, the preset time delay duration Δt 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 parent 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, X i is the X time limit of the switch node i, t i is the absolute closing time of the switch node i, and t j is the absolute closing time of the parent node switch j of the node switch i.
Preferably, the closing according to the X time limit of each node includes:
Switching on the node switch according to the electrical direction of the topological structure, and switching on the node switch by taking the corresponding X time limit as countdown when the current sub-node switch of the node switch enters a state to be switched on;
Repeating the steps until all the switch nodes are switched on.
A time limit setting system for an in-situ feeder automation terminal, comprising:
and an access module: based on the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence;
X time limit calculation module: determining the X time limit of each node according to the access sequence and the preset time delay time length;
And a closing module: and switching on according to the X time limit of each node.
Preferably, the access module includes:
Accessing an edge search submodule: determining an edge to be accessed according to a searching strategy of a trunk line and a branch line based on a node switch of a breaker;
an access sequence acquisition sub-module: and accessing the switch nodes of the topological structure according to the edges to be accessed to obtain an access sequence.
Preferably, the access edge searching submodule includes:
search unit: accessing and marking the outgoing node switch of the topological structure, and searching for adjacent node switches according to a searching strategy of a branch line after a main line;
An access unit: if adjacent switch nodes exist, forming an edge to be accessed, and performing access judgment on the edge to be accessed; otherwise, the traversal of the current node is ended.
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 the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence; determining the X time limit of each node according to the access sequence and the preset time delay time length; and switching on according to the X time limit of each node. The invention combines feeder automation with X limit setting, and realizes correct operation of feeder automation matched with a distribution switch.
According to the technical scheme provided by the invention, on the basis of a depth-first search algorithm, the node switches on the trunk and the branch are searched, the node switches are subjected to X time limit sequencing, and only one column switch is switched on at any time, so that the engineering effects of first switching on the trunk and then switching on the branch in the reclosing power transmission process of the circuit breaker are realized, the fault of the circuit can be accurately positioned, and the inaccuracy of fault elimination is reduced.
Drawings
FIG. 1 is a flow chart of an X-limit setting method of an in-situ feeder automation terminal of the present invention;
FIG. 2 is a diagram of an in-situ feeder automation terminal X-limit setting method decision process in accordance with 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, drawings and examples.
Example 1:
as shown in fig. 1 and fig. 2, the method for setting the X-limit of the in-situ feeder automation terminal provided by the invention is as follows:
S1: based on the topology structure, the node switch is accessed according to the strategy of the trunk line and the branch line from the outgoing line breaker, and an access sequence is obtained.
The closing time interval deltat of the adjacent segment switches is determined. In general, there are two types of short time intervals Δt=7s and long time intervals Δt=14s.
Starting from the outgoing line circuit breaker, the adjacent sectionalizer is accessed and marked as accessed.
And searching each adjacent switch node from the switch node in turn according to the principle of 'a first main line and a second branch line'.
Let x be the currently accessed switch node, and after marking x as accessed, select an unvisited edge (x, y) from switch n i.
S2: and determining the X time limit of each node according to the access sequence and the preset time delay time length. If node y is found to have been accessed, then another undetected edge from x is reselected, otherwise y is accessed along edge (x, y) and marked as accessed. The search then starts from y until all paths from n j have been searched, i.e., after all reachable nodes from y have been accessed, then go back to x, and a non-detected edge from n i is selected.
The above process is carried out until all sides of the x start are accessed.
At this time, if x is not the outgoing line switch node, backtracking to the node accessed before x; otherwise, all nodes with paths communicated with the switch node in the topological graph are accessed, and the traversal process is finished.
All switch terminals of the feeder are numbered according to the access sequence (n 1,n2,n3,L nn).
According to the sequence of each sectional switch, the absolute closing time delay time is calculated by sequentially increasing delta T at intervals, and the absolute closing time of the ith switch is T i =i.delta T.
The X time of any ith switch is the absolute closing delay time of the ith switch minus the absolute closing delay time X i＝ti-tj of the father node. Where the j switch is the parent node of the i switch. And after the parent node indicates that the j switch is closed, the i switch starts X delay after being electrified.
S3: and switching on according to the X time limit of each node.
Example 2:
Based on the same inventive idea, the invention also provides an X-limit setting system of the in-situ feeder automation terminal, which comprises
And an access module: based on the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence;
X time limit calculation module: determining the X time limit of each node according to the access sequence and the preset time delay time length;
And a closing module: and switching on according to the X time limit of each node.
The access module comprises:
Accessing an edge search submodule: determining an edge to be accessed according to a searching strategy of a trunk line and a branch line based on a node switch of a breaker;
an access sequence acquisition sub-module: and accessing the switch nodes of the topological structure according to the edges to be accessed to obtain an access sequence.
The access edge search submodule comprises:
search unit: accessing and marking the outgoing node switch of the topological structure, and searching for adjacent node switches according to a searching strategy of a branch line after a main line;
An access unit: if adjacent switch nodes exist, forming an edge to be accessed, and performing access judgment on the edge to be accessed; otherwise, the traversal of the current node is ended.
The access sequence acquisition sub-module comprises:
A judging unit: judging whether the node switch on the side to be accessed is accessed or not;
if the access sequence number is not accessed, accessing and marking the current side to be accessed to obtain the access sequence number; otherwise, returning to the parent node switch of the current node, and searching for the adjacent node switch;
an access sequence acquisition unit: repeating the steps until the node switch of the topological structure is accessed, and obtaining an access sequence.
The X time limit calculation module comprises:
an absolute closing time calculation sub-module: based on the access sequence and a preset time delay time, obtaining the absolute closing time of the node switch;
An X time limit calculation sub-module: and obtaining the X time limit of the node switch sequence based on the absolute closing time of the node switch.
And the absolute closing time is calculated in the absolute closing time calculation submodule, and the absolute closing time is shown in the following formula:
ti＝i·ΔT
Wherein T i is the absolute closing time of the switch node i, i is the sequence number of the switch node in the access sequence, and Δt is the preset delay time.
The preset time delay duration deltat is 7 seconds or 14 seconds.
The X time limit calculation submodule comprises:
parent node absolute closing time acquisition unit: acquiring the absolute closing time of a father node switch of the node switch;
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 parent node switch of the node switch.
The X time limit obtaining unit calculates X time limit of the node switch as shown in the following formula:
Xi＝ti-tj
Wherein, X i is the X time limit of the switch node i, t i is the absolute closing time of the switch node i, and t j is the absolute closing time of the parent node switch j of the node switch i.
The closing module comprises:
timing closing sub-module: switching on the node switch according to the electrical direction of the topological structure, and switching on the node switch by taking the corresponding X time limit as countdown when the current 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 switch nodes are closed.
Example 3:
The main line branch is generally set to be switched on firstly, the switching on switch is set to be 7s firstly, all the switches of other branches need to be switched on firstly and then switched on, and then the X-limit setting process of the feeder line is as follows:
According to the depth-first traversal algorithm, as shown in fig. 3, the switching-on sequence of the middle switch is a-B-C-D-E-F, and the numbers of the switches are respectively: (n 1,n2,n3,n4,n5,n6,n7).
Calculating the absolute closing time of each switch ：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 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 will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments and advantages of all such modifications, equivalents, improvements and similar to the present invention are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (9)
1. An X-limit setting method of an in-situ feeder automation terminal, comprising:
based on the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence;
Determining the X time limit of each node according to the access sequence and the preset time delay time length;
Switching on according to the X time limit of each node;
and determining the X time limit of each node according to the access sequence and the preset time delay time length, wherein the X time limit comprises the following steps:
Based on the access sequence and a preset time delay time, obtaining the absolute closing time of the node switch;
obtaining an X time limit of the node switch sequence based on the absolute closing time of the node switch;
and obtaining the absolute closing time of the node switch based on the access sequence and the preset time delay time, wherein the absolute closing time is shown in the following formula:
ti＝i·ΔT
Wherein T i is the absolute closing time of the switch node i, i is the sequence number of the switch node in the access sequence, and DeltaT is the preset delay time;
The obtaining the X time limit of the node switch sequence based on the absolute closing time of the node switch comprises the following steps:
Acquiring the absolute closing time of a father node switch of the node switch;
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 a father node switch of the node switch;
The calculation formula of the X time limit of the node switch is as follows:
Xi＝ti-tj
Wherein, X i is the X time limit of the switch node i, t i is the absolute closing time of the switch node i, and t j is the absolute closing time of the parent node switch j of the node switch i.
2. The method of claim 1, wherein the topology-based access to the node switches from the outgoing circuit breaker according to a policy of a trunk line first and a branch line second, to obtain the access sequence, comprises:
Determining an edge to be accessed according to a searching strategy of a trunk line and a branch line based on a node switch of a breaker;
And accessing the switch nodes of the topological structure according to the edges 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 based on the node switch of the breaker, comprises:
accessing and marking the outgoing node switch of the topological structure, and searching for adjacent node switches according to a searching strategy of a branch line after a main line;
if adjacent switch nodes exist, forming an edge to be accessed, and performing access judgment on the edge to be accessed; otherwise, the traversal of the current node is ended.
4. The method of claim 2, wherein accessing the switching node of the topology according to the edge to be accessed, to obtain the access sequence, comprises:
judging whether the node switch on the side to be accessed is accessed or not;
if the access sequence number is not accessed, accessing and marking the current side to be accessed to obtain the access sequence number; otherwise, returning to the parent node switch of the current node, and searching for the adjacent node switch;
repeating the steps until the node switch of the topological structure is accessed, and obtaining an access sequence.
5. The method of claim 1, wherein,
The preset time delay duration deltat is 7 seconds or 14 seconds.
6. The method of claim 1, wherein closing the switch according to the X time limit of each node comprises:
Switching on the node switch according to the electrical direction of the topological structure, and switching on the node switch by taking the corresponding X time limit as countdown when the current sub-node switch of the node switch enters a state to be switched on;
Repeating the steps until all the switch nodes are switched on.
7. A time limit setting system for an in-situ feeder automation terminal, comprising:
and an access module: based on the topological structure, starting from the outgoing line breaker, accessing the node switch according to a strategy of a main line and a branch line to obtain an access sequence;
X time limit calculation module: determining the X time limit of each node according to the access sequence and the preset time delay time length;
and a closing module: switching on according to the X time limit of each node;
The X time limit calculation module comprises:
an absolute closing time calculation sub-module: based on the access sequence and a preset time delay time, obtaining the absolute closing time of the node switch;
An X time limit calculation sub-module: obtaining an X time limit of the node switch sequence based on the absolute closing time of the node switch;
and the absolute closing time is calculated in the absolute closing time calculation submodule, and the absolute closing time is shown in the following formula:
ti＝i·ΔT
Wherein T i is the absolute closing time of the switch node i, i is the sequence number of the switch node in the access sequence, and DeltaT is the preset delay time;
The X time limit calculation submodule comprises:
parent node absolute closing time acquisition unit: acquiring the absolute closing time of a father node switch of the node switch;
x time limit acquisition unit: 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 a father node switch of the node switch;
The X time limit obtaining unit calculates X time limit of the node switch as shown in the following formula:
Xi＝ti-tj
Wherein, X i is the X time limit of the switch node i, t i is the absolute closing time of the switch node i, and t j is the absolute closing time of the parent node switch j of the node switch i.
8. The system of claim 7, wherein the access module comprises:
Accessing an edge search submodule: determining an edge to be accessed according to a searching strategy of a trunk line and a branch line based on a node switch of a breaker;
an access sequence acquisition sub-module: and accessing the switch nodes of the topological structure according to the edges to be accessed to obtain an access sequence.
9. The system of claim 8, wherein the access edge search submodule includes:
search unit: accessing and marking the outgoing node switch of the topological structure, and searching for adjacent node switches according to a searching strategy of a branch line after a main line;
An access unit: if adjacent switch nodes exist, forming an edge to be accessed, and performing access judgment on the edge to be accessed; otherwise, the traversal of the current node is ended.
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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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