CN111864771B - Low-voltage distribution area topology automatic identification method - Google Patents
Low-voltage distribution area topology automatic identification method Download PDFInfo
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- CN111864771B CN111864771B CN202010734284.2A CN202010734284A CN111864771B CN 111864771 B CN111864771 B CN 111864771B CN 202010734284 A CN202010734284 A CN 202010734284A CN 111864771 B CN111864771 B CN 111864771B
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a low-voltage transformer area topology automatic identification method, which belongs to the field of distribution automation in an electric power system and comprises three steps of identification of a user variable relationship, identification of topology branches and calculation of a topology hierarchical relationship. The invention has the beneficial effects that: 1. the topological identification of the low-voltage distribution network area is realized based on the three-phase commutation principle, and the accuracy is high; 2. the power utilization of users is not influenced, and the three-phase imbalance phenomenon in the transformer area is restrained to a certain extent. When unbalanced three-phase, the transform of phase sequence can exchange heavy load looks and non-heavy load looks to can reduce the unbalance degree between the three-phase, the phase sequence transform of multistage block terminal can be better reduce the three-phase unbalance degree of block terminal at all levels of platform district, have fine practical value.
Description
Technical Field
The invention belongs to the field of distribution automation in a power system, is applied to monitoring a distribution transformer area, and particularly relates to a low-voltage transformer area topology automatic identification method based on a three-phase commutation event.
Background
With the rapid development of the modernization process of our country, the number of power users is greatly increased, and the power distribution system is improved. In order to improve the reliability of power supply, the intelligent management of power utilization of the power distribution network is of great significance. In a power distribution network, the premise of realizing the intelligent monitoring of distribution area distribution is that the topological structure of the distribution area is known, but in the daily distribution operation and maintenance management work, the problem that the connection relation of a user transformer is not clear often exists, especially, in a newly-built distribution area, part of topology cannot be directly obtained at all, manual touch check is needed, the workload is huge, and the waste of manpower and material resources is caused. When the actual topology changes, the changes are manually recorded and the topology data is updated, or special organizations manually perform on-site patrolling to correct the errors. The manual general survey, because the low voltage distribution network line distribution is complicated, and cable pit or overhead line lay in parallel, patrol and examine not only inefficiency, with high costs, can't acquire low-voltage platform district topology information moreover accurately.
In the prior art, topology identification classification is based on a power frequency current distortion principle to complete topology identification. Transient pulse currents need to be injected in the grid. The heavy-load type distortion signal is not easy to detect. And a topology identification method based on big data analysis similarity exists, so that the phenomenon of difficult identification exists under the condition of light load.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic identification method of low-voltage distribution area topology, which is based on a three-phase commutation principle, utilizes the principle that commutation events can be identified only by branch subordinate equipment to construct the distribution area topology, has obvious commutation event characteristics and high detection accuracy, and further constructs the upper-lower level relation between distribution boxes to complete the low-voltage distribution network distribution area topology identification.
In order to solve the technical problems, the invention adopts the technical scheme that: the automatic identification method for the topology of the low-voltage transformer area is characterized in that a transformer of a distribution transformer terminal is installed on an ammeter box, a branch box and a wire outlet end, phase sequence switching devices for changing three-phase sequences are arranged at the wire outlet end of the transformer and the wire inlet end in the branch box, branch monitoring units for detecting the three-phase sequences are arranged in the branch box and the ammeter box, and the automatic identification method for the topology of the low-voltage transformer area comprises the following steps: the method comprises the following steps: step A, identifying a user variable relationship: the distribution transformer terminal controls the matched phase sequence switching device to carry out phase change and inquires the phase change event identification results of all the branch monitoring units, and then all the equipment which identifies the phase change event is marked as local area equipment; b, topology branch identification: the distribution transformer terminal respectively controls the branch monitoring units in each branch box according to a certain sequence to adjust and output phase sequences through a matched phase sequence switching device and inquires the phase change event identification results of all the branch monitoring units, and then all the equipment which identifies the phase change event is marked as the lower level of the branch box which executes the phase change event; c, calculating a topological hierarchy relation: and after the distribution transformer terminal collects all the equipment information, the topological hierarchy relationship is obtained through calculation.
The invention has the beneficial effects that: 1. the topological identification of the low-voltage distribution network area is realized based on the three-phase commutation principle, and the accuracy is high; 2. the power consumption of a user is not influenced, the unbalanced three-phase phenomenon of the transformer area is restrained to a certain extent, when the three phases are unbalanced, the transformation of the phase sequence can exchange a heavy-load phase and a non-heavy-load phase, so that the unbalance degree between the three phases can be reduced, the three-phase unbalance degree of each stage of transformer area distribution boxes can be better reduced through the transformation of the phase sequence of the multi-stage distribution boxes, and the power utilization system has good practical value.
The present invention will be described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a diagram of a recognition model of the present invention.
Detailed Description
Referring to the attached figure 1, the invention provides a low-voltage transformer area topology automatic identification method, which is based on a transformer with a distribution transformation terminal arranged on an ammeter box, a branch box and a wire outlet end, wherein phase sequence switching devices for changing three-phase sequences are arranged at the wire outlet end of the transformer and the wire inlet end in the branch box, and branch monitoring units for detecting the three-phase sequences are arranged in the branch box and the ammeter box. Wherein, the branch box can be designed with multiple stages.
The method of the invention comprises the following steps:
step A, identifying a user variable relationship: and the distribution transformer terminal controls the matched phase sequence switching device to carry out phase change and inquires the phase change event identification results of all the branch monitoring units, and then marks all the equipment which identifies the phase change event as local area equipment. Specifically, the distribution transformer terminal queries the phase change event identification result of the branch monitoring unit in a wireless micropower mode.
Referring to fig. 2, when the phase sequence switching device at the distribution terminal performs a phase change operation (e.g., the phase sequence of the control output ABC is adjusted to BCA), the branch monitoring units in branch boxes ID1 and ID2 and distribution boxes ID3-ID6 can detect the phase change event. The distribution terminal marks the ID1-ID6 as a device of the local zone.
The branch monitoring unit for detecting the commutation event comprises the following steps:
step 1: low-pass filtering the three-phase voltage signals, wherein the filtering formula is y (n) = sigma h (m) x (n-m), and the cut-off frequency is 100 Hz;
step 2: extracting positive zero-crossing time, and judging whether adjacent zero-crossing time has mutation, | (t2-t1) - (t3-t2) |>tset,tsetIn order to set a fixed value (8 ms), if the three-phase voltages all detect abnormal sudden changes of zero-crossing time within a certain window period at the same time, the three-phase commutation event is judged. Where t1, t2, and t3 are zero-crossing times of the three-phase voltages, respectively.
B, topology branch identification: the distribution transformer terminal respectively controls the branch monitoring units in each branch box according to a certain sequence to adjust and output phase sequences through the matched phase sequence switching devices and inquires the phase change event identification results of all the branch monitoring units, and then all the equipment which identifies the phase change event is marked as the lower level of the branch box which executes the phase change event.
Referring to fig. 2, the phase sequence switching device in branch box ID1 performs a commutation, and the branch monitoring units in switchgears ID3 and ID4 can detect the commutation event, so that the distribution terminal knows that switchgears ID3 and ID4 are wired to branch box ID 1. The phase sequence switching device in branch box ID2 performs a commutation, and the branch monitoring units in switchgears ID5 and ID6 can detect the commutation event, so the distribution terminal knows that switchgears ID5 and ID6 are wired to branch box ID 2.
C, calculating a topological hierarchy relation: and after the distribution transformer terminal collects all the equipment information, the topological hierarchy relationship is obtained through calculation.
The topological hierarchy relation calculation comprises the following steps:
c-1, counting the number n of branch boxes under the distribution area according to the result of the user variable relationship;
c-2, establishing an n multiplied by n two-dimensional adjacent matrix M, wherein all row and column element variables of the matrix are set to be 0;
step C-3, traversing the received topology branch identification result, if the phase change result of IDi is maximally contained in the phase change result of IDj, then IDi is the lower node of IDj, and setting element M (i, j) in the matrix to 1;
and C-4, finishing mapping of all recognition results in the adjacency matrix and calculation of the whole adjacency matrix, and outputting the adjacency matrix relation.
The invention is illustrated in detail below with reference to specific examples.
Step A: family-variant relationship identification
After the phase change event is generated by the phase sequence switching device in the distribution terminal control ID0 distribution box, the identification results of all branch monitoring units are inquired and collected as shown in the following table:
according to the collected commutation event identification results, the IDs 0, 1, 2, 3, 4, 5 and 6 are calculated to belong to the local station area. ID7, ID8, ID9, and ID10 do not belong to the station zone.
And B: branch relation identification
According to the identification result of the transformer area relationship, the power distribution terminal sequentially commands the branch monitoring units in the corresponding branch boxes to complete the phase change action through the phase sequence switching device, and the phase change event results identified by each branch monitoring unit after each action are wirelessly collected through micropower are shown in the following table:
the ID5 commutation result and the ID6 commutation result set contain the smallest of the ID2 commutation results, so the upper level of ID5 and ID6 is ID2, transitioning to the adjacency matrices (ID2, ID5) and (ID2, ID6) set to 1. Similarly, the upper level of ID3 and ID4 is ID1, (ID1, ID3) and (ID1, ID4) set to 1. The upper level of ID1 and ID2 is ID0, (ID0, ID1) and (ID0, ID2) set to 1.
The transformation into adjacency matrix is shown in the following table:
it is clear from the adjacency matrix that ID1 and ID2 are connected under ID0, ID3 and ID4 are connected under ID1, and ID5 and ID6 are connected under ID 2.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (1)
1. The automatic identification method for the topology of the low-voltage transformer area is characterized by comprising the following steps of:
step A, identifying a user variable relationship: the distribution transformer terminal controls the matched phase sequence switching device to carry out phase change and inquires the phase change event identification results of all the branch monitoring units, and then all the equipment which identifies the phase change event is marked as local area equipment;
b, topology branch identification: the distribution transformer terminal respectively controls the branch monitoring units in each branch box according to a certain sequence to adjust and output phase sequences through a matched phase sequence switching device and inquires the phase change event identification results of all the branch monitoring units, and then all the equipment which identifies the phase change event is marked as the lower level of the branch box which executes the phase change event;
c, calculating a topological hierarchy relation: after the distribution transformer terminal collects all the equipment information, a topological hierarchy relation is obtained through calculation;
the topology hierarchy relation calculation in the step C comprises the following steps:
c-1, counting the number n of branch boxes under the distribution area according to the result of the user variable relationship;
c-2, establishing an n multiplied by n two-dimensional adjacent matrix M, wherein all row and column element variables of the matrix are set to be 0;
step C-3, traversing the received topology branch identification result, if the phase change result of IDi is maximally contained in the phase change result of IDj, then IDi is the lower node of IDj, and setting element M (i, j) in the matrix to 1;
c-4, completing mapping of all recognition results in the adjacency matrix and calculation of the whole adjacency matrix, and outputting the adjacency matrix relation;
the branch monitoring unit for detecting the commutation event comprises the following steps:
step 1: low-pass filtering the three-phase voltage signals, wherein the filtering formula is y (n) = sigma h (m) x (n-m), and the cut-off frequency is 100 Hz;
step 2: extracting positive zero crossing time and judging adjacent zero crossingWhether mutation occurs at the moment, | (t2-t1) - (t3-t2) | calculation of blood count>tset, tsetAnd if the three-phase voltages detect abnormal sudden changes of zero-crossing time within a certain window period at the same time, judging that the three-phase has a phase change event.
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| CN202010734284.2A CN111864771B (en) | 2020-07-24 | 2020-07-24 | Low-voltage distribution area topology automatic identification method |
| PCT/CN2021/084634 WO2022016903A1 (en) | 2020-07-24 | 2021-03-31 | Automatic low-voltage area topology identification method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111864771B (en) * | 2020-07-24 | 2021-11-12 | 石家庄科林电气股份有限公司 | Low-voltage distribution area topology automatic identification method |
| CN113471971A (en) * | 2021-08-17 | 2021-10-01 | 南方电网科学研究院有限责任公司 | Power distribution station area topology network generation method and device |
| CN114792972B (en) * | 2022-03-08 | 2023-10-13 | 南方电网电力科技股份有限公司 | Low-voltage area topological relation carding method and device |
| CN114665602B (en) * | 2022-04-01 | 2024-04-30 | 国网安徽省电力有限公司电力科学研究院 | Plug-and-play method and system for low-voltage power distribution rapid electric topology implementation equipment |
| CN114814420B (en) * | 2022-04-20 | 2024-02-02 | 北京飞利信信息安全技术有限公司 | Low-voltage distribution network topology identification method and system based on frozen data |
| CN115169596B (en) * | 2022-05-05 | 2024-03-08 | 国网山东省电力公司德州市陵城区供电公司 | Transformer area line loss analysis method based on integrated electric quantity and line loss management system |
| CN114726740B (en) * | 2022-06-09 | 2022-09-02 | 国网浙江省电力有限公司宁波供电公司 | Method and system for identifying platform area topology and intelligent fusion terminal |
| CN115276715B (en) * | 2022-06-28 | 2023-09-22 | 航天中电(重庆)微电子有限公司 | Method for identifying topological relation of transformer area based on characteristic current signals and readable storage medium |
| CN114825647B (en) * | 2022-06-30 | 2022-09-23 | 国网浙江省电力有限公司宁波供电公司 | Topological relation-based distribution room line loss monitoring method and related equipment |
| CN116345697B (en) * | 2023-05-29 | 2023-08-01 | 北京飞利信信息安全技术有限公司 | Low-voltage station area system |
| CN116404757B (en) * | 2023-06-02 | 2023-09-05 | 青岛鼎信通讯股份有限公司 | Distribution area topological relation identification method |
| CN116520019B (en) * | 2023-06-30 | 2023-09-12 | 中国电力科学研究院有限公司 | Intelligent electric energy metering device and circuit topology identification method |
| CN116722658B (en) * | 2023-08-11 | 2023-12-29 | 北京智芯微电子科技有限公司 | Low-voltage area topology identification method and device, storage medium and chip equipment |
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