CN111245095A - Topology identification method of low-voltage distribution network topology identification system - Google Patents
Topology identification method of low-voltage distribution network topology identification system Download PDFInfo
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Abstract
The invention discloses a topology identification method of a low-voltage distribution network topology identification system.A master station and a concentrator adopt wireless communication or wired network communication, the implementation is simple and convenient, the concentrator and a node information collector adopt power carrier communication, and the concentrator and the node information collector which can mutually communicate are ensured to belong to the same station area, so that the comparison of voltage zero crossing point time in the same station area in the step two is facilitated, and the problem of data confusion among different station areas can not occur. In addition, the topology identification method compares the voltage zero-crossing time of each node with the voltage zero-crossing time of the phase line A, the phase line B and the phase line C in the same station area to identify the same-phase line node group, is simple and easy in identification method, is favorable for determining that the nodes for correlation comparison in the third step are the nodes connected to the same phase line, and is favorable for improving the efficiency of correlation comparison in the third step.
Description
Technical Field
The invention relates to a topology identification method of a low-voltage distribution network topology identification system.
Background
Low voltage distribution networks are an important component of power distribution systems and are directly connected to a large number of residential, enterprise and commercial customers. With the popularization of electric vehicles, charging equipment and grid-connected distributed power generation, these bring new challenges to the power quality, power supply reliability and economic operation of low-voltage distribution networks. In low voltage distribution networks, the lack or inaccuracy of network topology information is a concern. The accurate user side phase and topological connection relation has important significance for operation and maintenance management of the power distribution network. Typically, power companies record and manage network connection information for various power distribution equipment and assets in an enterprise geographic information system. However, a considerable number of enterprise GIS cover only medium voltage distribution networks, with less information about low voltage distribution networks. Due to the wide coverage of the distribution network, the rapid change of the power supply, the lack of working resources and effective technical means for establishing a low-voltage network topology at the downstream of the distribution transformer, and the addition of frequent line upgrading and new customers, at present, the GIS of most domestic electric power companies has no topology record of the low-voltage distribution network.
The topology of a low voltage distribution network may enable topological connections among its numerous assets (e.g., feeders, distribution transformers, splitters, and subscribers). If accurate and detailed network topology of the cell can be obtained, the cell can be managed more efficiently, and faults can be eliminated and maintained. At present, the following two problems mainly exist, namely crosstalk interference between the stations; second, cross-phase reading. These all make the reliability of the topology information of the original cell area low. In the topology of the distribution network area, the line length and the topological branching play a great role. In the process of overhauling after a fault occurs in a transformer area, if an accurate detailed topological graph of the power distribution network can be obtained, the fault can be rapidly checked and removed and repaired, so that the fault recovery efficiency can be greatly improved, and the workload of maintenance personnel can be greatly reduced.
Therefore, how to overcome the above-mentioned drawbacks has become an important issue to be solved by those skilled in the art.
Disclosure of Invention
The invention overcomes the defects of the technology and provides a topology identification method of a low-voltage distribution network topology identification system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a topology identification method of a low-voltage distribution network topology identification system comprises a main station, a concentrator and a node information collector, wherein the concentrator is used for being arranged at a three-phase voltage power supply starting end of each distribution area, the node information collector is used for being arranged at each node of each distribution area, the main station is in wireless communication or wired network communication with the concentrator, the concentrator is in power carrier communication with the node information collector, the main station, the concentrator and the node information collector are respectively provided with identity identification information, and the topology identification method comprises the following steps:
step one, the master station identifies the topology of a corresponding transformer area through a corresponding concentrator, the concentrator collects voltage-time information of an A phase outgoing line, a B phase outgoing line and a C phase outgoing line of a three-phase voltage power supply initial end of the corresponding transformer area so as to obtain the voltage zero crossing time of an A phase line, a B phase line and a C phase line of the three-phase voltage power supply initial end of the transformer area, and each node information collector collects voltage-time information of each node in the transformer area so as to obtain the voltage zero crossing time of each node;
step two, in the same station area, comparing the voltage zero-crossing time of each node with the voltage zero-crossing time of the phase lines A, B and C, and identifying the phase line where each node is located according to the principle that the voltage zero-crossing time between the nodes on the same phase line is the same and the voltage zero-crossing time between the nodes on non-same phase lines is different, so as to obtain a phase line node group A, a phase line node group B and a phase line node group C in the same station area;
and step three, in the same transformer area, carrying out correlation comparison on the voltage-time information between nodes in the same phase line node group, comparing a group of adjacent nodes according to the principle that the voltage-time information correlation between adjacent nodes is higher and the voltage-time information correlation between non-adjacent nodes is lower, and then summarizing the physical topology of all nodes in the same phase line node group and the physical topology of the transformer area.
In the topology identification method of the low-voltage distribution network topology identification system, in the first step, the concentrator and the node information collector are synchronized by a clock.
In the topology identification method of the topology identification system for the low-voltage distribution network, in the first step, the concentrator sends the relevant instruction for acquiring the voltage-time information to the node information collectors on the phase a outgoing line, the phase B outgoing line and the phase C outgoing line in the distribution room through power carrier communication, so that the node information collectors in the distribution room can acquire the voltage-time information.
In the topology identification method of the low-voltage distribution network topology identification system, in the first step, when the voltage-time information of each node in the distribution area and the voltage-time information of the a-phase outgoing line, the B-phase outgoing line and the C-phase outgoing line at the starting end of the distribution area are collected, the voltage-time information of a plurality of periods is collected, so that a plurality of voltage zero-crossing time of each collection point can be obtained.
In the identification control method of the topology identification system of the low-voltage distribution network, in the second step, the zero-crossing time of the voltage between the nodes on the same phase line is the same, and the allowable error range is 0 +/-180 mus.
In the third step, a Pearson correlation coefficient is used to compare the voltage-time information correlation between two nodes, determine whether the nodes are adjacent, and set a positive comparison threshold, when the absolute value of the voltage-time information correlation coefficient between two nodes is greater than the comparison threshold, it is determined that the two nodes are adjacent, otherwise, it is determined that the two nodes are not adjacent.
According to the topology identification method of the low-voltage distribution network topology identification system, in the first step and the second step, the voltage zero-crossing time only adopts the voltage rising edge zero-crossing time or only adopts the voltage falling edge zero-crossing time.
According to the topology identification method of the low-voltage distribution network topology identification system, the node information collector is integrated on the branch box or the user side meter box, and the node information collector is bound with the information of the branch box or the user side meter box.
According to the topology identification method of the low-voltage distribution network topology identification system, the information of the branch box or the information of the meter box at the user side comprises the installation position information.
Compared with the prior art, the invention has the beneficial effects that:
the topology identification system has small influence on the power grid, does not need to rely on a large amount of labor force, change the running state of the power grid, inject high-power current signals or high-frequency harmonic signals into the power grid and other technical schemes to realize physical topology identification, and has lower cost. The concentrator and the node information collector are communicated by power carrier waves, so that the concentrator and the node information collector which can communicate with each other belong to the same station area, comparison of voltage zero crossing point time in the same station area in the step two is facilitated, and the problem of data confusion among different station areas is avoided. In addition, the topology identification method compares the voltage zero-crossing time of each node with the voltage zero-crossing time of the phase line A, the phase line B and the phase line C in the same station area to identify the same-phase line node group, is simple and easy in identification method, is favorable for determining that the nodes for correlation comparison in the third step are the nodes connected to the same phase line, and is favorable for improving the efficiency of correlation comparison in the third step.
Detailed Description
The features of the present invention and other related features are further described in detail below by way of examples to facilitate understanding by those skilled in the art:
a topology identification method of a low-voltage distribution network topology identification system comprises a main station, a concentrator and a node information collector, wherein the concentrator is used for being arranged at a three-phase voltage power supply starting end of each distribution area, the node information collector is used for being arranged at each node of each distribution area, the main station is in wireless communication or wired network communication with the concentrator, the concentrator is in power carrier communication with the node information collector, the main station, the concentrator and the node information collector are respectively provided with identity identification information, and the topology identification method comprises the following steps:
step one, the master station identifies the topology of a corresponding transformer area through a corresponding concentrator, the concentrator collects voltage-time information of an A phase outgoing line, a B phase outgoing line and a C phase outgoing line of a three-phase voltage power supply initial end of the corresponding transformer area so as to obtain the voltage zero crossing time of an A phase line, a B phase line and a C phase line of the three-phase voltage power supply initial end of the transformer area, and each node information collector collects voltage-time information of each node in the transformer area so as to obtain the voltage zero crossing time of each node;
step two, in the same station area, comparing the voltage zero-crossing time of each node with the voltage zero-crossing time of the phase lines A, B and C, and identifying the phase line where each node is located according to the principle that the voltage zero-crossing time between the nodes on the same phase line is the same and the voltage zero-crossing time between the nodes on non-same phase lines is different, so as to obtain a phase line node group A, a phase line node group B and a phase line node group C in the same station area;
and step three, in the same transformer area, carrying out correlation comparison on the voltage-time information between nodes in the same phase line node group, comparing a group of adjacent nodes according to the principle that the voltage-time information correlation between adjacent nodes is higher and the voltage-time information correlation between non-adjacent nodes is lower, and then summarizing the physical topology of all nodes in the same phase line node group and the physical topology of the transformer area.
As described above, according to the difference of the zero-crossing time of the three-phase circuit, with the phase a as the reference, the difference between the other two phases is 6.7ms and 13.3ms, so in the step two, the nodes with the same zero-crossing time are set as the same group, and the nodes in the station area can be divided into three groups.
As mentioned above, each node voltage in the low-voltage distribution network has strong space-time characteristics, and in a time section, due to differences of power utilization habits of users and uncertainty of loads, each node voltage shows fluctuation characteristics along with time. On the one hand, node voltages at different spatial positions also present certain characteristics on the spatial section due to the physical circuit characteristics; on the other hand, nodes directly connected by the power line have strong correlation and are regarded as neighboring nodes. Based on the actual topological connection relationship of each node in the same-phase line node group, the voltage correlation between adjacent nodes is strong, and the voltage correlation between cross-nodes is weak, so that in the third step, the physical topology of all nodes in the same-phase line node group can be summarized by identifying the adjacent nodes of each node through the correlation comparison.
As mentioned above, the topology identification system has small influence on the power grid, does not need to rely on a large amount of labor force, change the running state of the power grid, inject high-power current signals or high-frequency harmonic signals into the power grid and other technical schemes to realize physical topology identification, and has low cost. The concentrator and the node information collector are communicated by power carrier waves, so that the concentrator and the node information collector which can communicate with each other belong to the same station area, comparison of voltage zero crossing point time in the same station area in the step two is facilitated, and the problem of data confusion among different station areas is avoided. In addition, the topology identification method compares the voltage zero-crossing time of each node with the voltage zero-crossing time of the phase line A, the phase line B and the phase line C in the same station area to identify the same-phase line node group, is simple and easy in identification method, is favorable for determining that the nodes for correlation comparison in the third step are the nodes connected to the same phase line, and is favorable for improving the efficiency of correlation comparison in the third step.
As described above, in the specific implementation, in the step, the concentrator and the node information collector are synchronized by a clock, for example, a GPS is used for timing.
As described above, in the first step, the concentrator sends the related instruction of collecting the voltage-time information to the node information collectors on the a-phase outgoing line, the B-phase outgoing line and the C-phase outgoing line in the transformer area through power carrier communication, so that the node information collectors in the transformer area collect the voltage-time information.
As described above, in the specific implementation, in the step one, when the voltage-time information of each node in the platform area and the voltage-time information of the a-phase outgoing line, the B-phase outgoing line, and the C-phase outgoing line at the starting end of the platform area are collected, voltage-time information of a plurality of periods is collected, so that a plurality of voltage zero-crossing points of each collection point are obtained, and the in-phase nodes are compared more easily.
In the second step, the zero-crossing time of the voltage between the nodes on the same phase line is the same, and the allowable error range is 0 ± 180 μ s.
As described above, in the third step, a Pearson correlation coefficient is used to compare the voltage-time information correlation between two nodes, determine whether the two nodes are adjacent to each other, and set a positive comparison threshold, when the absolute value of the voltage-time information correlation coefficient between two nodes is greater than the comparison threshold, it is determined that the two nodes are adjacent to each other, otherwise, it is determined that the two nodes are not adjacent to each other.
As mentioned above, the Pearson correlation coefficient is used to describe how closely two sets of variables X, Y are related, between-1 and 1, and is generally denoted as Rxy. N is the number of samples, the larger the absolute value of R is, the stronger the correlation is, the calculation formula is
When the relevance value is larger than a certain threshold k, the physical connection relation exists between the nodes, and then the connection relation between the nodes is determined. It should be noted that the weaker the association between nodes connected across the nodes. When judging, only two directly connected contacts need to be determined.
As described above, in this case, the variable X, Y is a vector of voltage-time information of two nodes when comparing the voltages at nodes ④⑤, ⑧⑩ and,
Adjacent, ①④ adjacent, ⑤⑧ adjacent, ⑩
When they are adjacent, the nodes ① - ④ - ⑤ - ⑧ - ⑩ can be obtained
-
The physical topology of (a).
In the specific implementation, in step one and step two, only the voltage rising edge zero-crossing time or only the voltage falling edge zero-crossing time is used for the voltage zero-crossing time.
As described above, in specific implementation, the node information collector is integrated on the branch box or the user-side meter box, and the node information collector binds information of the branch box or information of the user-side meter box, which is convenient for better application.
As described above, in the specific implementation, the information of the branch box or the information of the meter box on the user side includes the installation position information, which is convenient for better application.
As described above, the present disclosure is directed to a topology identification method of a topology identification system of a low voltage distribution network, and all technical solutions identical or similar to the present disclosure should be regarded as falling within the protection scope of the present disclosure.
Claims (9)
1. A topology identification method of a low-voltage distribution network topology identification system is characterized in that the topology identification system comprises a main station, a concentrator and a node information collector, wherein the concentrator is arranged at a three-phase voltage power supply starting end of each distribution area, the node information collector is arranged at each node in each distribution area, the main station is in wireless communication or wired network communication with the concentrator, the concentrator is in power carrier communication with the node information collector, the main station, the concentrator and the node information collector are respectively provided with identity identification information, and the topology identification method comprises the following steps:
step one, the master station identifies the topology of a corresponding transformer area through a corresponding concentrator, the concentrator collects voltage-time information of an A phase outgoing line, a B phase outgoing line and a C phase outgoing line of a three-phase voltage power supply initial end of the corresponding transformer area so as to obtain the voltage zero crossing time of an A phase line, a B phase line and a C phase line of the three-phase voltage power supply initial end of the transformer area, and each node information collector collects voltage-time information of each node in the transformer area so as to obtain the voltage zero crossing time of each node;
step two, in the same station area, comparing the voltage zero-crossing time of each node with the voltage zero-crossing time of the phase lines A, B and C, and identifying the phase line where each node is located according to the principle that the voltage zero-crossing time between the nodes on the same phase line is the same and the voltage zero-crossing time between the nodes on non-same phase lines is different, so as to obtain a phase line node group A, a phase line node group B and a phase line node group C in the same station area;
and step three, in the same transformer area, carrying out correlation comparison on the voltage-time information between nodes in the same phase line node group, comparing a group of adjacent nodes according to the principle that the voltage-time information correlation between adjacent nodes is higher and the voltage-time information correlation between non-adjacent nodes is lower, and then summarizing the physical topology of all nodes in the same phase line node group and the physical topology of the transformer area.
2. The topology identification method of the topology identification system of the low-voltage distribution network according to claim 1, wherein in the first step, the concentrator is synchronized with a node information collector clock.
3. The topology identification method of the low-voltage distribution network topology identification system according to claim 1, characterized in that in step one, the concentrator sends out related instructions for collecting voltage-time information to the node information collectors on the a-phase outgoing line, the B-phase outgoing line and the C-phase outgoing line in the distribution room through power carrier communication, so that the node information collectors in the distribution room collect the voltage-time information.
4. The topology identification method of the low-voltage distribution network topology identification system according to claim 1, wherein in the step one, when collecting the voltage-time information of each node in the distribution area and collecting the voltage-time information of the a-phase outgoing line, the B-phase outgoing line and the C-phase outgoing line at the beginning of the distribution area, the voltage-time information of a plurality of periods is collected, so as to obtain a plurality of voltage zero-crossing times of each collection point.
5. The identification control method of the topology identification system of the low-voltage distribution network according to claim 1, wherein in the second step, the zero-crossing time of the voltage between the nodes on the same phase line is the same, and the allowable error range is 0 ± 180 μ β.
6. The identification control method of the low-voltage distribution network topology identification system according to claim 1, characterized in that in the third step, a Pearson correlation coefficient is used to compare the voltage-time information correlation between two nodes, determine whether the nodes are adjacent, set a positive comparison threshold, when the absolute value of the voltage-time information correlation coefficient between two nodes is greater than the comparison threshold, determine that the two nodes are adjacent, otherwise, determine that the two nodes are not adjacent.
7. The topology identification method of the topology identification system of the low-voltage distribution network according to claim 1, wherein in the first step and the second step, the voltage zero-crossing time is only the voltage rising edge zero-crossing time or only the voltage falling edge zero-crossing time.
8. The topology identification method of the low-voltage distribution network topology identification system according to any one of claims 1 to 7, characterized in that the node information collector is integrated on a branch box or a user side meter box, and the node information collector is bound with information of the belonging branch box or information of the belonging user side meter box.
9. The topology identification method of the topology identification system of the low-voltage distribution network according to claim 8, wherein the information of the branch box or the meter box at the subscriber side includes installation position information.
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