CN110854845B - Topology identification method and system for low-voltage distribution network - Google Patents
Topology identification method and system for low-voltage distribution network Download PDFInfo
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- 238000005516 engineering process Methods 0.000 claims description 8
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a topology identification method of a low-voltage distribution network, which comprises the following steps: and determining the meter box to which each meter belongs by utilizing the shielding effect of the meter box on the electromagnetic field. And determining the electric quantity of each meter box by using the electric quantity of each meter, and acquiring the electric quantity of each branch line. And determining the branch line to which each meter box belongs according to the electric quantity of each meter box and the electric quantity of each branch line. And determining the corresponding topological relation of the branch circuit-meter box-meter of the low-voltage distribution network based on the meter box to which each meter belongs and the branch circuit to which each meter box belongs. The technical scheme provided by the invention can timely and accurately update the topological structure of the power distribution network in various application scenes.
Description
Technical Field
The invention relates to the technical field of topology analysis in a power system, in particular to a topology identification method and system for a low-voltage distribution network.
Background
The low-voltage distribution network is the end supply network directly facing the users and is an important component of the power grid. The topological relation of the low-voltage distribution network is important for improving the power supply reliability and the power supply service capability of a power company.
At present, the topological structure of the low-voltage distribution network is mainly identified through a service mode. However, the electrical connection of the low-voltage distribution network is complex, and a phenomenon of private construction sometimes exists, so that the realization difficulty of timely and accurately mastering the topological structure of the low-voltage distribution network is high.
Disclosure of Invention
Therefore, a topology identification method and a topology identification system for a low-voltage distribution network are needed to solve the problem that the topology structure of the distribution network cannot be updated timely and accurately.
A method of topology identification of a low voltage distribution network, the method comprising:
s1: determining the meter box to which each meter belongs by using the shielding effect of the meter box on the electromagnetic field;
s2: determining the electric quantity of each meter box by using the electric quantity of each meter, and acquiring the electric quantity of each branch line;
s3: determining the branch line to which each meter box belongs according to the electric quantity of each meter box and the electric quantity of each branch line;
s4: and determining the corresponding topological relation of the branch circuit-meter box-meter of the low-voltage distribution network based on the meter box to which each meter belongs and the branch circuit to which each meter box belongs.
In one embodiment, the S1 includes:
sending an electromagnetic communication signal to an ith meter box, wherein if a jth meter can receive the electromagnetic communication signal in the ith meter box, the jth meter belongs to the ith meter box;
the low-voltage distribution network meter box counting method comprises the steps that i belongs to [1, n ], n is the total number of meter boxes in the low-voltage distribution network, j belongs to [1, m ], and m is the total number of meter boxes in the low-voltage distribution network.
In one embodiment, before S2, the method further includes:
and acquiring the electric quantity of each meter by using an accurate time synchronization technology and an instantaneous freezing technology.
In one embodiment, the step of obtaining the electrical quantity of each branch line in S2 includes:
and acquiring the electric quantity of each branch line by using an accurate time synchronization technology and an instantaneous freezing technology.
In one embodiment, in S2, determining the electrical quantity of each meter box by using the electrical quantity of each meter box includes:
the electric quantity in the ith meter box is the sum of the electric quantities corresponding to all meters in the ith meter box;
wherein i belongs to [1, n ], and n is the total number of meter boxes in the low-voltage distribution network.
In one embodiment, the S3 includes:
the electrical quantity of the a-th branch line is accumulated by the electrical quantities of a plurality of meter boxes, and then the meter boxes belong to the a-th branch;
wherein a belongs to [1, k ], and k is the total number of branch lines in the low-voltage distribution network.
In one embodiment, the electrical quantities include voltage, current, power, and quantity of electricity.
A topology identification system for a low voltage distribution network, the system comprising:
the system comprises a branch data acquisition module, a dual-mode Internet of things module and a convergence terminal;
the branch data acquisition module is used for acquiring the electrical quantity of each branch line and sending the electrical quantity of each branch line to the convergence terminal;
the dual-mode Internet of things module is used for determining the meter boxes to which the meters belong by utilizing the shielding effect of the meter boxes on the electromagnetic field and sending the meter boxes to the convergence terminal;
the convergence terminal is configured to determine an electrical quantity of each meter box by using the electrical quantity of each meter, determine a branch line to which each meter box belongs according to the electrical quantity of each meter box and the electrical quantity of each branch line sent by the branch data acquisition module, and determine a corresponding topological relation between the branch line and the meter box of the low-voltage distribution network based on the meter box to which each meter belongs and the branch line to which each meter box belongs, which are sent by the dual-mode internet of things module.
The invention provides a topology identification method and a topology identification system for a low-voltage distribution network, wherein the method comprises the following steps: and determining the meter box to which each meter belongs by utilizing the shielding effect of the meter box on the electromagnetic field. And determining the electric quantity of each meter box by using the electric quantity of each meter, and acquiring the electric quantity of each branch line. And determining the branch line to which each meter box belongs according to the electric quantity of each meter box and the electric quantity of each branch line. And determining the corresponding topological relation between the branch line of the low-voltage distribution network, the meter box and the meter based on the meter box to which each meter belongs and the branch line to which each meter box belongs. Based on the technical scheme provided by the invention, the topological relation between each meter box and each branch line can be timely and accurately obtained by comparing the electric quantity of each meter box with the electric quantity of each branch line, the topological relation between each meter and each meter box can be timely and accurately obtained by the shielding effect of the meter boxes on electromagnetic fields, and further the topological relation between the branch lines, the meter boxes and the meters of the low-voltage distribution network is obtained, so that the power supply reliability of a power company can be greatly improved.
Drawings
Fig. 1 illustrates a topology identification method for a low voltage distribution network according to the present invention;
fig. 2 is a schematic diagram of a topology identification structure of a low-voltage distribution network according to the present invention.
Description of reference numerals:
branch data acquisition module 1
Dual-mode Internet of things module 2
Convergence terminal 3
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment provides a topology identification method for a low-voltage distribution network, as shown in fig. 1, including:
s1: determining the meter box to which each meter belongs by using the shielding effect of the meter box on the electromagnetic field;
s2: determining the electric quantity of each meter box by using the electric quantity of each meter, and acquiring the electric quantity of each branch line;
s3: determining the branch line to which each meter box belongs according to the electric quantity of each meter box and the electric quantity of each branch line;
s4: and determining the corresponding topological relation of the branch circuit-meter box-meter of the low-voltage distribution network based on the meter box to which each meter belongs and the branch circuit to which each meter box belongs.
In one embodiment, in S1, an electromagnetic communication signal is sent to each meter box, and the electromagnetic communication signal in each meter box can be received only by the meter in the meter box because the meter box has an electromagnetic field shielding effect. Therefore, if the jth meter can receive the electromagnetic communication signal in the ith meter box, the jth meter belongs to the ith meter box, i belongs to [1, n ], n belongs to the total number of meter boxes in the low-voltage distribution network, j belongs to [1, m ], and m is the total number of meter boxes in the low-voltage distribution network. The meter box of the low-voltage distribution network is provided with an intelligent number plate, and the intelligent number plate has a positioning function and a unique ID number. Wherein, the positioning function can be GPS positioning or other positioning forms.
In one embodiment, before S2, the electrical quantities of the meters need to be obtained by using a precise time synchronization technique and a transient freezing technique. Or according to the actual working condition, directly reading the electric quantity of each meter from the dial plate of the meter. After the electrical quantities of the meters are obtained, the electrical quantities of the meter boxes need to be determined by the electrical quantities of the meters. The electric quantity in each meter box is the sum of the electric quantities corresponding to all the meters in each meter box.
In one embodiment, in S2, the process of obtaining the electrical quantity of each branch line may obtain the electrical quantity of each branch line by using a precision time synchronization technique and a transient freezing technique. After obtaining the electrical quantity of each branch line and the electrical quantity of each meter box, the step S3 includes the steps of determining the branch line to which each meter box belongs according to the electrical quantity of each meter box and the electrical quantity of each branch line: the electrical quantity of the a-th branch line is accumulated by the electrical quantities of a plurality of meter boxes, and then the meter boxes belong to the a-th branch; wherein a belongs to [1, k ], and k is the total number of branch lines in the low-voltage distribution network.
In the above embodiments, the electrical quantities include voltage, current, power and quantity of electricity.
Another embodiment provides a topology identification system of a low voltage distribution network, as shown in fig. 2, including: the system comprises a branch data acquisition module 1, a dual-mode Internet of things module 2 and a convergence terminal 3. The branch data acquisition module 1 and the convergence terminal 3 can communicate in a wired or wireless mode; the dual-mode internet of things module 2 and the convergence terminal 3 can also communicate in a wired or wireless manner.
The branch data acquisition module 1 is installed at a first-stage branch in front of the meter box and used for acquiring voltage, current, power and electric quantity of each branch line and sending the voltage, current, power and electric quantity of each branch line to the convergence terminal 3 in a wireless or carrier mode.
The dual-mode internet of things module 2 is installed in a meter of a user, a communication module of the electric energy meter can be replaced by the dual-mode internet of things module 2, a meter box to which each meter belongs is determined by using the shielding effect of the meter box on an electromagnetic field, and the meter box to which each meter belongs is sent to the convergence terminal 3 in a wired or wireless mode.
The convergence terminal 3 is configured to determine an electrical quantity of each meter box by using the electrical quantity of each meter, determine a branch line to which each meter box belongs according to the electrical quantity of each meter box and the electrical quantity of each branch line sent by the branch data acquisition module 1, and determine a corresponding topological relation between the branch line of the low-voltage distribution network and the meter box-meter based on the meter box to which each meter belongs and the branch line to which each meter box belongs, which are sent by the dual-mode internet of things module 2.
In one embodiment, the topology identification system of the low voltage distribution network may further comprise a master station. And the master station is used for receiving the corresponding topological relation of the branch line, the meter box and the meter of the low-voltage distribution network determined by the convergence terminal 3, displaying the corresponding topological relation and facilitating the use of a user. The master station and the convergence terminal 3 can communicate with each other through an optical fiber/medium voltage carrier/4G.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A topology identification method for a low-voltage distribution network is characterized by comprising the following steps:
s1: determining the meter box to which each meter belongs by using the shielding effect of the meter box on the electromagnetic field;
s2: determining the electric quantity of each meter box by using the electric quantity of each meter, and acquiring the electric quantity of each branch line;
s3: determining the branch line to which each meter box belongs according to the electric quantity of each meter box and the electric quantity of each branch line;
s4: determining a corresponding topological relation of a branch circuit-meter box-meter of the low-voltage distribution network based on the meter box to which each meter belongs and the branch circuit to which each meter box belongs;
the S3 includes: the electrical quantity of the a-th branch line is accumulated by the electrical quantities of a plurality of meter boxes, and then the meter boxes belong to the a-th branch; wherein a belongs to [1, k ], and k is the total number of branch lines in the low-voltage distribution network.
2. The method according to claim 1, wherein the S1 includes:
sending an electromagnetic communication signal to an ith meter box, wherein if a jth meter can receive the electromagnetic communication signal in the ith meter box, the jth meter belongs to the ith meter box;
the low-voltage distribution network meter box counting method comprises the steps that i belongs to [1, n ], n is the total number of meter boxes in the low-voltage distribution network, j belongs to [1, m ], and m is the total number of meter boxes in the low-voltage distribution network.
3. The method according to claim 1, wherein before the S2, further comprising:
and acquiring the electric quantity of each meter by using an accurate time synchronization technology and an instantaneous freezing technology.
4. The method according to claim 1, wherein the step of obtaining the electrical quantity of each branch line in S2 comprises:
and acquiring the electric quantity of each branch line by using an accurate time synchronization technology and an instantaneous freezing technology.
5. The method of claim 1, wherein the step of determining the electrical quantity of each meter box by using the electrical quantity of each meter in S2 comprises:
the electric quantity in the ith meter box is the sum of the electric quantities corresponding to all meters in the ith meter box;
wherein i belongs to [1, n ], and n is the total number of meter boxes in the low-voltage distribution network.
6. The method according to any of claims 1, 3, 4, 5, wherein the electrical quantities comprise voltage, current, power and quantity of electricity.
7. A topology identification system for a low voltage distribution network, said system comprising:
the system comprises a branch data acquisition module (1), a dual-mode Internet of things module (2) and a convergence terminal (3);
the branch data acquisition module (1) is used for acquiring the electrical quantity of each branch line and sending the electrical quantity of each branch line to the convergence terminal (3);
the dual-mode Internet of things module (2) is used for determining the meter boxes to which the meters belong by utilizing the shielding effect of the meter boxes on the electromagnetic field and sending the meter boxes to the convergence terminal (3);
the convergence terminal (3) is configured to determine an electrical quantity of each meter box by using the electrical quantity of each meter, determine a branch line to which each meter box belongs according to the electrical quantity of each meter box and the electrical quantity of each branch line sent by the branch data acquisition module (1), and determine a corresponding topological relation between the branch line and the meter box of the low-voltage distribution network based on the meter box to which each meter belongs and the branch line to which each meter box belongs, which are sent by the dual-mode internet of things module (2);
the convergence terminal (3) is further configured to determine that the multiple meter boxes belong to an a-th branch when the electrical quantity of the a-th branch line is an accumulated electrical quantity of multiple meter boxes; wherein a belongs to [1, k ], and k is the total number of branch lines in the low-voltage distribution network.
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| CN109217471A (en) * | 2018-09-19 | 2019-01-15 | 北京中电普华信息技术有限公司 | The identification device of low-voltage power distribution station area's network topology |
| CN109494715A (en) * | 2018-11-13 | 2019-03-19 | 国电南瑞南京控制系统有限公司 | A kind of low-voltage power distribution station area electrical network topology Dynamic Identification system and method |
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| US8810251B2 (en) * | 2011-08-31 | 2014-08-19 | General Electric Company | Systems, methods, and apparatus for locating faults on an electrical distribution network |
| CN109873501B (en) * | 2019-04-15 | 2020-09-11 | 东南大学 | Automatic identification method for low-voltage distribution network topology |
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| CN109217471A (en) * | 2018-09-19 | 2019-01-15 | 北京中电普华信息技术有限公司 | The identification device of low-voltage power distribution station area's network topology |
| CN109494715A (en) * | 2018-11-13 | 2019-03-19 | 国电南瑞南京控制系统有限公司 | A kind of low-voltage power distribution station area electrical network topology Dynamic Identification system and method |
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