CN112737128B - Alternating current chopper-based station division branch topology identification method - Google Patents
Alternating current chopper-based station division branch topology identification method Download PDFInfo
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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
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- 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
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Abstract
A station division branch topology identification method based on alternating current chopping comprises the following steps: 1. 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 the exchange chopping sequence; 2. the branch node or the terminal node performs alternating current chopping at the corresponding time segment t, and the chopping frequency is f; 3. each branch node carries out current detection in a corresponding time segment t, if the chopping frequency f or the harmonic frequency N x f and the frequency mixing frequency N x f plus or minus 50Hz of the power frequency are detected, the detection result is marked as 1, otherwise, the detection result is marked as 0; 4. all the branch nodes form a bitmap from the detection result of each time segment t, and the total node calculates the branch topology of the station area according to the bitmap. The invention can realize the accurate identification of the branch topology with low cost, and meanwhile, no directional current exists, and the electricity metering cannot be influenced.
Description
Technical Field
The invention relates to the technical field of smart grids, in particular to a station branch topology identification method based on alternating current chopping.
Background
The current power grid is developing towards intellectualization and informatization, and in the process, a few technical problems to be solved urgently restrict the development of the intelligent power grid, and the topological structure deficiency of a low-voltage transformer area is one of important problems.
In general, for convenience, users in a low-voltage transformer area often walk more randomly, so that the actual power consumption of the users and the data of a branch table or a summary table are larger to come in and go out, and the line loss statistics cannot be performed by a power grid company or the statistical value is meaningless; secondly, the private wiring can cause hidden danger to the safety of power maintenance personnel. Therefore, in order to finely manage the area, it is an urgent need to accurately identify the branch topology in the area.
The nodes in one area mainly comprise three nodes of a terminal node (a family table), a branch node (a branch table) and a total node (a concentrator, namely a total table). As shown in fig. 1, the identification of the branch topology is to identify the affiliations between the terminal node and each branch node and the affiliations between the branch nodes of different levels.
At present, topology identification of the cell branches mainly comprises two main methods based on current injection and correlation of cell information. The current injection-based identification method can have reverse current, so that electric energy metering is affected, the cost of a current injection circuit is high, and the current at a detection end can be small and difficult to detect due to a shunt effect. Because the power grid environment is complex, the identification method based on the correlation of the information of the areas is greatly influenced by the load fluctuation of the power grid and the like, and the topology information of the areas cannot be accurately identified at present.
Therefore, how to accurately identify the branch topology of the area becomes the subject of the present invention.
Disclosure of Invention
The invention aims to provide a station division branch topology identification method based on alternating current chopping.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a station area branch topology identification method based on alternating current chopping, wherein nodes in a station area comprise total nodes, branch nodes and terminal nodes, the terminal nodes correspond to a user table, the branch nodes correspond to a branch table, and the total nodes correspond to a total table;
the identification method comprises the following steps:
an intelligent meter reading network is preset in the platform area in advance, 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;
dividing a time period T into n time segments T, wherein n is a positive integer;
each time segment t is provided with a terminal node or a branch node for alternating current chopping action;
setting planning information at the same time, wherein the planning information comprises a one-to-one correspondence between each time segment t and each terminal node or branch node, and further comprises an order of alternating current chopping actions of each terminal node or branch node, wherein the same terminal node or branch node does not repeatedly perform the alternating current chopping actions;
broadcasting the planning information in a whole network through the intelligent meter reading network;
step two, according to the arrangement of the planning information, the branch node or the terminal node performs alternating current chopping action in a corresponding time segment t, and the chopping frequency is f;
thirdly, each branch node carries out current detection 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 if the harmonic frequency N x f of the chopping frequency f and the frequency mixing frequencies N x f-50Hz and N x 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 fourthly, all the branch nodes report the detection result of each time segment t to the total node to form a bitmap, and the total node calculates the branch topology of the whole area according to the bitmap.
The relevant content explanation in the technical scheme is 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 areas 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 for each time segment t to carry out alternating current chopping action;
step two, according to the arrangement of the planning information, a branch node or a terminal node or a total node performs alternating current chopping action in a corresponding time segment t, wherein the chopping frequency is f;
and thirdly, each branch node and each total node detect current through the current detection circuit in a corresponding time segment t, if the time segment t can detect the chopping frequency f or the harmonic frequency N x f of the chopping frequency f and the mixing frequencies N x f-50Hz and N x 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.
By the design, the area of which total node belongs can be determined when a plurality of areas exist.
The working principle and the advantages of the invention are as follows:
the invention relates to a station branching topology identification method based on alternating current chopping, which comprises the steps of firstly dividing a time period T into n time segments T, and arranging a terminal node or a branching 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 the order of exchanging chopping of each terminal node or branch node; broadcasting the planning information in the whole network; 2. the branch node or the terminal node performs alternating current chopping at the corresponding time segment t, and the chopping frequency is f; 3. each branch node carries out current detection in a corresponding time segment t, if the chopping frequency f or the harmonic frequency N x f and the frequency mixing frequency N x f plus or minus 50Hz of the power frequency are detected, the detection result is marked as 1, otherwise, the detection result is marked as 0; 4. all the branch nodes report the detection result of each time segment t to the total node, and the total node calculates the branch topology of the station area according to the bitmap.
Compared with the prior art, the invention can realize the accurate identification of the branch topology with low cost, and meanwhile, no reverse current exists, so that the electricity metering cannot be influenced.
Drawings
FIG. 1 is a block diagram of a topology of a cell 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 used in an embodiment of the present invention;
FIG. 4 is a graph of current waveforms through Z1 when no chopping is performed in accordance with an embodiment of the present invention;
FIG. 5 is a graph showing the waveform of current flowing through Z1 after chopping in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples:
examples: the present invention will be described in detail with reference to the drawings, wherein modifications and variations are possible in light of the teachings of the present invention, without departing from the spirit and scope of the present invention, as will be apparent to those of skill in the art upon understanding the embodiments of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. Singular forms such as "a," "an," "the," and "the" are intended to include the plural forms as well, as used herein.
As used herein, the terms "comprising," "including," "having," and the like are intended to be open-ended terms, meaning including, but not limited to.
The term (terms) as used herein generally has the ordinary meaning of each term as used in this field, in this disclosure, and in the special context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description herein.
Referring to fig. 1-5, a method for identifying a branch topology of a station area based on alternating current chopping is disclosed, wherein nodes in the station area comprise a total node, branch nodes and terminal nodes, the terminal nodes correspond to a user table, the branch nodes correspond to the branch table, and the total node corresponds to a total table.
As shown in fig. 2, the identification method includes:
an intelligent meter reading network is preset in the platform area in advance, 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 in 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 requirements, and are not repeated herein because the invention is not the point of the scheme.
Wherein n is a positive integer; the time slices t are "time slices" as shown in fig. 2, and the time lengths of the time slices t may be equal.
Each time segment t is provided with a terminal node or a branch node for alternating current chopping action;
setting planning information at the same time, wherein the planning information comprises a one-to-one correspondence between each time segment t and each terminal node or branch node, and further comprises an order of alternating current chopping actions of each terminal node or branch node, wherein the same terminal node or branch node does not repeatedly perform the alternating current chopping actions;
broadcasting the planning information in a whole network through the intelligent meter reading network, namely, communicating the planning information to each terminal node and each branch node;
step two, according to the arrangement of the planning information, the branch node or the terminal node performs alternating current chopping action in a corresponding time segment t, and the chopping frequency (namely the switching frequency) is f;
thirdly, each branch node carries out current detection 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 if the harmonic frequency N x f of the chopping frequency f and the frequency mixing frequencies N x f-50Hz and N x 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 fourthly, all the branch nodes report the detection result of each time segment t to the total node to form a bitmap, each bit in the bitmap represents the detection result of a certain time segment t, and the total node calculates the branch topology of the whole station 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 implemented according to the needs.
As shown in fig. 3 to 5, in the ac chopper circuit according to 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 a MOSFET, and on-off of the controlled electronic switch is controlled by a PWM signal sent by the MCU, and the chopping frequency is the frequency of the PWM signal. N in fig. 3 represents the zero line, and L represents the hot line.
When the S1 switch is always on (see FIG. 4), current through Z1 is only power frequency current with frequency of 50Hz. If S1 is periodically turned on and off at a frequency f (see fig. 5), the current flowing through Z1 includes not only the 50Hz power frequency component but also the frequency components f±50Hz and n×f±50Hz after mixing with the harmonic frequencies n×f of the switching frequency f and f. However, since the whole low-voltage transformer has only one power supply (i.e., low-voltage transformer), all upper nodes of the node performing the ac chopping operation can detect the current with the frequency of n×f±50Hz, while the lower nodes of the node and the nodes of other branches cannot detect the current with the frequency of n×f±50Hz.
For example, if the user table 1_2 performs the ac chopping operation, only the branch table 1 and the total table can detect the current with the frequency of n×f±50Hz, and all other nodes cannot detect the current with the frequency of n×f±50Hz. If the branching table 2 performs an ac chopping action, only the total current of n×f±50Hz can be detected.
The branch nodes can know which nodes are the nodes under the branch by detecting whether the current with the frequency of N f plus or minus 50Hz exists in each time slice and according to the corresponding relation between the time slices issued by the total node and the node addresses. After all the branch nodes report the information to the total node, the total node can identify the branch topology structure of the whole station area.
If the number of the station areas 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 for each time segment t to carry out alternating current chopping action;
step two, according to the arrangement of the planning information, a branch node or a terminal node or a total node performs alternating current chopping action in a corresponding time segment t, wherein the chopping frequency is f;
and thirdly, each branch node and each total node detect current through the current detection circuit in a corresponding time segment t, if the time segment t can detect the chopping frequency f or the harmonic frequency N x f of the chopping frequency f and the mixing frequencies N x f-50Hz and N x 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.
By the design, the area of which total node belongs can be determined when a plurality of areas exist.
Compared with the prior art, the invention can realize the accurate identification of the branch topology with low cost, and meanwhile, no directional current exists, and the electricity metering cannot be influenced.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (3)
1. A station area branch topology identification method based on alternating current chopping, wherein nodes in a station area comprise total nodes, branch nodes and terminal nodes, the terminal nodes correspond to a user table, the branch nodes correspond to a branch table, and the total nodes correspond to a total table; the method is characterized in that:
the identification method comprises the following steps:
an intelligent meter reading network is preset in the platform area in advance, 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;
dividing a time period T into n time segments T, wherein n is a positive integer;
each time segment t is provided with a terminal node or a branch node for alternating current chopping action;
setting planning information at the same time, wherein the planning information comprises a one-to-one correspondence between each time segment t and each terminal node or branch node, and further comprises an order of alternating current chopping actions of each terminal node or branch node, wherein the same terminal node or branch node does not repeatedly perform the alternating current chopping actions;
broadcasting the planning information in a whole network through the intelligent meter reading network;
step two, according to the arrangement of the planning information, the branch node or the terminal node performs alternating current chopping action in a corresponding time segment t, and the chopping frequency is f;
thirdly, each branch node carries out current detection 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 if the harmonic frequency N x f of the chopping frequency f and the frequency mixing frequencies N x f-50Hz and N x 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 fourthly, all the branch nodes report the detection result of each time segment t to the total node to form a bitmap, and the total node calculates the branch topology of the whole area according to the bitmap.
2. The station branch topology identification method of claim 1, wherein: the time length of each time segment t is equal.
3. The station branch topology identification method of claim 1, wherein:
if the number of the station areas 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 for each time segment t to carry out alternating current chopping action;
step two, according to the arrangement of the planning information, a branch node or a terminal node or a total node performs alternating current chopping action in a corresponding time segment t, wherein the chopping frequency is f;
and thirdly, each branch node and each total node detect current through the current detection circuit in a corresponding time segment t, if the time segment t can detect the chopping frequency f or the harmonic frequency N x f of the chopping frequency f and the mixing frequencies N x f-50Hz and N x 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.
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| 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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