CN112737128A - Transformer area branch topology identification method based on alternating current chopping - Google Patents
Transformer area branch topology identification method based on alternating current chopping Download PDFInfo
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Abstract
A method for identifying a branch topology of a distribution room based on alternating current chopping comprises the following steps: dividing a time period T into n time segments T, and arranging a terminal node or a branch node for alternating current chopping in each time segment T; setting planning information including the corresponding relation between each time segment t and each terminal node or branch node and an alternating current chopping sequence; secondly, performing alternating current chopping on the branch node or the terminal node in a corresponding time slice t, wherein the chopping frequency is f; thirdly, current detection is carried out on each branch node in a corresponding time segment t, if the chopping frequency f or the harmonic frequency N f and the mixing frequency N f +/-50 Hz of the power frequency are detected, the detection result is marked as 1, and if not, the detection result is 0; and fourthly, forming a bitmap by the detection result of each time slice t by all the branch nodes, and calculating the branch topology of the platform area by the total node according to the bitmap. The method can realize accurate identification of the branch topology with low cost, has no directional current, and does not influence the electricity consumption metering.
Description
Technical Field
The invention relates to the technical field of smart power grids, in particular to a platform area branch topology identification method based on alternating current chopping.
Background
Currently, a power grid is developing towards the direction of intellectualization and informatization, some technical problems to be solved urgently in the process restrict the development of the power grid intellectualization, and the loss of the topological structure of a low-voltage transformer area is one of the more important problems.
Generally, users in a low-voltage distribution area often walk freely for convenience, so that the actual electricity consumption of the users and data of branch tables or general tables are in large access, and a power grid company cannot count line loss statistics or the statistics value loses significance; secondly, the wiring of private lap joint in disorder can cause hidden danger to the safety of power maintenance personnel. Therefore, in order to perform fine management on the station area, it is urgently required to accurately identify the branch topology in the station area.
The nodes in a distribution area mainly comprise three nodes, namely a terminal node (user table), a branch node (branch table) and a main node (concentrator, namely main table). As shown in fig. 1, the branch topology is identified by identifying the affiliation between the terminal node and each branch node and the affiliation between the branch nodes in different levels.
At present, two main methods based on current injection and correlation of station information are mainly used for topology identification of station branches. The current injection-based identification method has the disadvantages that reverse current exists, so that electric energy metering is influenced, the cost of a current injection circuit is high, and due to the shunt effect, the current at the detection end is small and difficult to detect. However, because the power grid environment is relatively complex, the identification method based on the correlation of the platform area information is greatly influenced by power grid load fluctuation and the like, and the platform area topological information cannot be accurately identified at present.
Therefore, how to accurately identify the branch topology of the cell becomes a subject to be researched and solved by the invention.
Disclosure of Invention
The invention aims to provide a station area branch topology identification method based on alternating current chopping.
In order to achieve the purpose, the invention adopts the technical scheme that:
a district branch topology identification method based on alternating current chopping is disclosed, wherein nodes in a district comprise a total node, branch nodes and terminal nodes, the terminal nodes correspond to a user table, the branch nodes correspond to branch tables, and the total node corresponds to a total table;
the identification method comprises the following steps:
in advance, an intelligent meter reading network is preset in the distribution room, a carrier meter reading module and an alternating current chopper circuit are preset in a terminal node, a branch node and a total node, and a current detection circuit is preset in the branch node and the total node;
step one, dividing a time period T into n time segments T, wherein n is a positive integer;
arranging a terminal node or a branch node to perform alternating current chopping action in each time segment t;
setting a piece of planning information at the same time, wherein the planning information comprises a one-to-one correspondence relationship between each time segment t and each terminal node or branch node, and also comprises a sequence of alternating current chopping actions performed by each terminal node or branch node, wherein the alternating current chopping actions are not repeatedly performed by the same terminal node or branch node;
carrying out whole-network broadcasting on the planning information through the intelligent meter reading network;
step two, the branch node or the terminal node performs alternating current chopping action in a corresponding time slice t according to the arrangement of the planning information, wherein the chopping frequency is f;
thirdly, current detection is carried out on each branch node in a corresponding time segment t through the current detection circuit, if the chopping frequency f can be detected in the time segment t, or the harmonic frequency N f of the chopping frequency f and the mixing frequencies N f-50Hz and N f +50Hz of the power frequency are detected, the detection result of the time segment t is marked as 1, otherwise, the detection result is marked as 0;
and step four, all the branch nodes form a bitmap for the detection result of each time slice t and report the bitmap to the main node, and the main node calculates the branch topology of the whole station area according to the bitmap.
The relevant content in the above technical solution is explained as follows:
1. in the above scheme, the time lengths of the time segments t are equal.
2. In the above scheme, if the number of the distribution area is greater than one, the number of the total nodes is greater than one;
step one, arranging a terminal node or a branch node or a total node to perform alternating current chopping operation in each time segment t;
secondly, performing alternating current chopping action on the branch node or the terminal node or the total node in a corresponding time slice t according to the arrangement of the planning information, wherein the chopping frequency is f;
and thirdly, current detection is carried out on each branch node and each total node in a corresponding time segment t through the current detection circuit, if the chopping frequency f can be detected in the time segment t, or the harmonic frequency Nxf of the chopping frequency f and the mixing frequencies Nxf-50 Hz and Nxf +50Hz of the power frequency are detected, the detection result of the time segment t is marked as 1, otherwise, the detection result is marked as 0.
By means of the design, the total node can be clear to which station area when the total node belongs to the plurality of station areas.
The working principle and the advantages of the invention are as follows:
the invention relates to a station zone branch topology identification method based on alternating current chopping, which comprises the following steps of dividing a time period T into n time segments T, and arranging a terminal node or a branch node for alternating current chopping in each time segment T; setting planning information which comprises the corresponding relation between each time segment t and each terminal node or branch node and the alternating current chopping sequence of each terminal node or branch node; and broadcasting the planning information in the whole network; secondly, performing alternating current chopping on the branch node or the terminal node in a corresponding time slice t, wherein the chopping frequency is f; thirdly, current detection is carried out on each branch node in a corresponding time segment t, if the chopping frequency f or the harmonic frequency N f and the mixing frequency N f +/-50 Hz of the power frequency are detected, the detection result is marked as 1, and if not, the detection result is 0; and fourthly, forming a bitmap by the detection result of each time segment t by all the branch nodes and reporting the bitmap to the main node, and calculating the branch topology of the platform area by the main node according to the bitmap.
Compared with the prior art, the method can realize accurate identification of the branch topology at low cost, does not have reverse current, and does not influence electricity metering.
Drawings
FIG. 1 is a block diagram of a distribution room topology of the present invention;
FIG. 2 is a flow chart of an identification method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an AC chopper circuit employed in an embodiment of the present invention;
FIG. 4 is a graph of the current waveform through Z1 when chopping is not performed according to an embodiment of the present invention;
FIG. 5 is a waveform of current flowing through Z1 after chopping in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples:
example (b): the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure may be shown and described, and which, when modified and varied by the techniques taught herein, can be made by those skilled in the art without departing from the spirit and scope of the disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms "a", "an", "the" and "the", as used herein, also include the plural forms.
As used herein, the terms "comprising," "including," "having," and the like are open-ended terms that mean including, but not limited to.
As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this written description and in the claims. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.
Referring to fig. 1 to 5, a method for identifying a branch topology of a distribution room based on ac chopping includes that nodes in the distribution room include a total node, branch nodes and terminal nodes, the terminal nodes correspond to a user table, the branch nodes correspond to a branch table, and the total node corresponds to the total table.
As shown in fig. 2, the identification method includes:
in advance, an intelligent meter reading network is preset in the distribution room, a carrier meter reading module and an alternating current chopper circuit are preset in a terminal node, a branch node and a total node, and a current detection circuit is preset in the branch node and the total node;
the intelligent meter reading network, the carrier meter reading module, the alternating current chopper circuit and the current detection circuit are all the prior art, can be understood and mastered by a person skilled in the art, and can be flexibly used in a specific implementation form according to needs.
Wherein n is a positive integer; the time slices t are "time slices" shown in fig. 2, and the time lengths of the time slices t may be equal.
Arranging a terminal node or a branch node to perform alternating current chopping action in each time segment t;
setting a piece of planning information at the same time, wherein the planning information comprises a one-to-one correspondence relationship between each time segment t and each terminal node or branch node, and also comprises a sequence of alternating current chopping actions performed by each terminal node or branch node, wherein the alternating current chopping actions are not repeatedly performed by the same terminal node or branch node;
carrying out whole-network broadcasting on the planning information through the intelligent meter reading network, namely, communicating the planning information to each terminal node and each branch node;
step two, the branch node or the terminal node performs alternating current chopping action in a corresponding time slice t according to the arrangement of the planning information, wherein the chopping frequency (namely the switching frequency) is f;
thirdly, current detection is carried out on each branch node in a corresponding time segment t through the current detection circuit, if the chopping frequency f can be detected in the time segment t, or the harmonic frequency N f of the chopping frequency f and the mixing frequencies N f-50Hz and N f +50Hz of the power frequency are detected, the detection result of the time segment t is marked as 1, otherwise, the detection result is marked as 0;
and step four, all the branch nodes form a bitmap of the detection result of each time segment t and report the bitmap to the main node, each bit in the bitmap represents the detection result of a certain time segment t, and the main node calculates the branch topology of the whole distribution area according to the bitmap.
The specific algorithm for calculating the branch topology by the total node is the prior art, can be understood and mastered by those skilled in the art, and can be flexibly used in a specific implementation form as required.
As shown in fig. 3 to 5, in the ac chopper circuit adopted in the embodiment of the present invention, Z1 is a safety capacitor or is formed by connecting a safety capacitor and an inductor in series, S1 is a controlled electronic switch such as a thyristor, an IGBT, or an MOSFET, whose on/off is controlled by a PWM signal sent by an MCU, and its chopping frequency is the frequency of the PWM signal. N in fig. 3 denotes a neutral line, and L denotes a live line.
When the S1 switch is always on (see fig. 4), the only current flowing through Z1 is the mains current at 50 Hz. On the other hand, if S1 is turned on and off periodically at the frequency f (see fig. 5), the current flowing through Z1 contains not only the 50Hz power frequency component but also frequency components f ± 50Hz and N × f ± 50Hz after mixing of 50Hz and the switching frequency f and the harmonic frequency N × f of f. However, since the entire low-voltage stage has only one power supply (i.e., a low-voltage stage transformer), all upper nodes of the nodes performing the ac chopping operation can detect the current with the frequency of nf ± 50Hz, and the lower nodes of the nodes and the nodes of other branches cannot detect the current with the frequency of nf ± 50 Hz.
For example, if the user table 1_2 performs ac chopping, only the branch table 1 and the general table can detect the current with the frequency of nf ± 50Hz, and all other nodes can not detect the current with the frequency of nf ± 50 Hz. If the branch table 2 performs an ac chopping action, only the summary table can detect the current of nf ± 50 Hz.
The branch nodes can know which nodes are the nodes under the branch by detecting whether the current with the frequency of N x f +/-50 Hz exists in each time slice and according to the corresponding relation between the time slices issued by the total nodes and the node addresses. After all the branch nodes report the information to the master node, the master node can identify the branch topological structure of the whole station area.
If the number of the distribution area is more than one, the number of the total nodes is more than one;
step one, arranging a terminal node or a branch node or a total node to perform alternating current chopping operation in each time segment t;
secondly, performing alternating current chopping action on the branch node or the terminal node or the total node in a corresponding time slice t according to the arrangement of the planning information, wherein the chopping frequency is f;
and thirdly, current detection is carried out on each branch node and each total node in a corresponding time segment t through the current detection circuit, if the chopping frequency f can be detected in the time segment t, or the harmonic frequency Nxf of the chopping frequency f and the mixing frequencies Nxf-50 Hz and Nxf +50Hz of the power frequency are detected, the detection result of the time segment t is marked as 1, otherwise, the detection result is marked as 0.
By means of the design, the total node can be clear to which station area when the total node belongs to the plurality of station areas.
Compared with the prior art, the method can realize accurate identification of the branch topology at low cost, does not have directional current, and does not influence electricity metering.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. A district branch topology identification method based on alternating current chopping is disclosed, wherein nodes in a district comprise a total node, branch nodes and terminal nodes, the terminal nodes correspond to a user table, the branch nodes correspond to branch tables, and the total node corresponds to a total table; the method is characterized in that:
the identification method comprises the following steps:
in advance, an intelligent meter reading network is preset in the distribution room, a carrier meter reading module and an alternating current chopper circuit are preset in a terminal node, a branch node and a total node, and a current detection circuit is preset in the branch node and the total node;
step one, dividing a time period T into n time segments T, wherein n is a positive integer;
arranging a terminal node or a branch node to perform alternating current chopping action in each time segment t;
setting a piece of planning information at the same time, wherein the planning information comprises a one-to-one correspondence relationship between each time segment t and each terminal node or branch node, and also comprises a sequence of alternating current chopping actions performed by each terminal node or branch node, wherein the alternating current chopping actions are not repeatedly performed by the same terminal node or branch node;
carrying out whole-network broadcasting on the planning information through the intelligent meter reading network;
step two, the branch node or the terminal node performs alternating current chopping action in a corresponding time slice t according to the arrangement of the planning information, wherein the chopping frequency is f;
thirdly, current detection is carried out on each branch node in a corresponding time segment t through the current detection circuit, if the chopping frequency f can be detected in the time segment t, or the harmonic frequency N f of the chopping frequency f and the mixing frequencies N f-50Hz and N f +50Hz of the power frequency are detected, the detection result of the time segment t is marked as 1, otherwise, the detection result is marked as 0;
and step four, all the branch nodes form a bitmap for the detection result of each time slice t and report the bitmap to the main node, and the main node calculates the branch topology of the whole station area according to the bitmap.
2. The method of identifying a cell branch topology according to claim 1, characterized in that: the time lengths of the time segments t are equal.
3. The method of identifying a cell branch topology according to claim 1, characterized in that:
if the number of the distribution area is more than one, the number of the total nodes is more than one;
step one, arranging a terminal node or a branch node or a total node to perform alternating current chopping operation in each time segment t;
secondly, performing alternating current chopping action on the branch node or the terminal node or the total node in a corresponding time slice t according to the arrangement of the planning information, wherein the chopping frequency is f;
and thirdly, current detection is carried out on each branch node and each total node in a corresponding time segment t through the current detection circuit, if the chopping frequency f can be detected in the time segment t, or the harmonic frequency Nxf of the chopping frequency f and the mixing frequencies Nxf-50 Hz and Nxf +50Hz of the power frequency are detected, the detection result of the time segment t is marked as 1, otherwise, the detection result is marked as 0.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896301A (en) * | 2017-02-15 | 2017-06-27 | 深圳市沃特玛电池有限公司 | Insulation Inspection System |
| CN110601363A (en) * | 2019-09-20 | 2019-12-20 | 重庆物奇科技有限公司 | Station area branch identification method and system based on sinusoidal current disturbance |
| CN111030097A (en) * | 2019-12-11 | 2020-04-17 | 江苏方天电力技术有限公司 | Low-voltage distribution network platform area topology identification method and system |
| CN111342425A (en) * | 2020-04-14 | 2020-06-26 | 山东德源电力科技股份有限公司 | Residual current operated circuit breaker and platform area network topology identification method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896301A (en) * | 2017-02-15 | 2017-06-27 | 深圳市沃特玛电池有限公司 | Insulation Inspection System |
| CN110601363A (en) * | 2019-09-20 | 2019-12-20 | 重庆物奇科技有限公司 | Station area branch identification method and system based on sinusoidal current disturbance |
| CN111030097A (en) * | 2019-12-11 | 2020-04-17 | 江苏方天电力技术有限公司 | Low-voltage distribution network platform area topology identification method and system |
| CN111342425A (en) * | 2020-04-14 | 2020-06-26 | 山东德源电力科技股份有限公司 | Residual current operated circuit breaker and platform area network topology identification method |
Non-Patent Citations (2)
| Title |
|---|
| LU LIU: "license plate recognition using topology structure feature", 《IEEE》, 21 August 2011 (2011-08-21) * |
| 李亚: "配电网台区用户智能识别系统研究", 《中国优秀硕士论文全文数据库》, 15 January 2018 (2018-01-15) * |
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