CN111103498B - Low-voltage transformer area line-change user relationship identification system and method - Google Patents
Low-voltage transformer area line-change user relationship identification system and method Download PDFInfo
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Abstract
The invention relates to a system and a method for identifying the relationship between line subscribers in a low-voltage distribution area, wherein the system for identifying the relationship between the line subscribers in the low-voltage distribution area comprises the following steps: the first identification device is arranged at the distribution and transformation outlet, the second identification devices are arranged at the inlet switches of the branch boxes of each branch circuit, and the third identification devices are arranged at the inlet switches of each meter box; and the first identification device is also used for screening out the father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification device to form a variable, line and household topological relation graph of the distribution area. The invention adopts the harmonic analysis algorithm to analyze the characteristic curve of each harmonic, and can more accurately identify the relation of the station areas.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a system and a method for identifying a line-changing user relationship in a low-voltage transformer area.
Background
The line in low-voltage transformer district is complicated and complicated, and the user's ammeter distributes irregularly, and the condition that two or more distribution transformers leaned on together often appears, and the home relationship of electric energy meter is carried out the record by the manual work usually, leads to archives mistake very easily, therefore the home problem of user's electric energy meter has brought very big puzzlement to the line loss statistics.
At present, a low-voltage transformer area identification instrument mainly adopts a carrier signal modulation method, a signal generating device is installed at a position where a distribution transformer appears, a carrier signal is injected on a bus, a signal receiving device is installed at the tail end of a low-voltage transformer area, namely the position of an electric meter, the carrier signal is received, and transformer area information and phase information of a user are determined according to the received carrier signal. For a line with long distance and serious interference, a power carrier signal may not be transmitted, a distribution transformer cannot completely isolate the carrier signal, and the signal can be coupled to another transformer area through a high-voltage side of the distribution transformer, so that the transformer area identification is inaccurate.
Disclosure of Invention
The invention aims to provide a system and a method for identifying the line-changing user relationship of a low-voltage transformer area, so as to more accurately identify the line-changing user relationship of the low-voltage transformer area.
In order to solve the above technical problem, the present invention provides a low-voltage transformer area subscriber relationship identification system, including:
the first identification device is arranged at the distribution and transformation outlet, the second identification device is arranged at the inlet switch of each branch circuit branch box, and the third identification device is arranged at the inlet switch of each meter box;
the first identification device is used for acquiring station area identification codes and installation information of all the second identification devices and all the third identification devices and harmonic data, screening out second identification devices of which station area identification codes are consistent with codes sent by the second identification devices and installation information is branch boxes, and setting father nodes of the second identification devices as the first identification devices; and the first identification device is also used for screening out the father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification device to form a variable, line and household topological relation graph of the distribution area.
Wherein the first recognition device, the second recognition device and the third recognition device each include: the intelligent power line monitoring system comprises a main control module, a transformer area identification module, an alternating current sampling module, a high-speed power line carrier communication module, a power supply module and a maintenance interface module, wherein the alternating current sampling module adopts a 6-channel 24-bit AD sampling chip and a DSP scheme and is used for measuring and calculating three-phase voltage, current 2-32 harmonic amplitude and content rate and extracting variation of each harmonic content rate, and the high-speed power line carrier communication module is used for realizing clock synchronization among identification devices and sampling data transmission.
The first identification device is used for sampling three-phase voltage and current signals at a distribution and transformation outgoing line and calculating the content rate of each subharmonic of the voltage and the current, the second identification device is used for sampling three-phase voltage and current signals at an incoming switch of each branch box and calculating the content rate of each subharmonic of the voltage and the current, and the third identification device is used for sampling three-phase voltage and current signals at an incoming switch of each meter box and calculating the content rate of each subharmonic of the voltage and the current.
Wherein the first identification device is located in the vicinity of the concentrator.
The first identification device is further configured to screen out parent nodes of all third identification devices according to harmonic data of the second identification device and the third identification devices, and form a topological relation diagram of a change, a line and a user of the distribution room, specifically:
the first identification device extracts harmonic data of a third identification device at a meter box level from storage one by one, screens out time nodes with the Nth harmonic content rate variation larger than a set value, and forms a three-dimensional grid graph with the Nth harmonic content rate variation, wherein an X axis represents an asset number of the third identification device, a Y axis represents the time nodes with the Nth harmonic content rate variation exceeding the set value, and a Z axis represents the Nth harmonic content rate variation;
taking a time node of a Y axis as a main key, screening out a unique third identification device on the X axis, comparing the variation of the second identification device of a certain branch box node in the Nth harmonic content rate on the time node, and if the variation trend is the same and the variation difference value is within a set value range, setting the second identification device of the branch box node as a father node of the third identification device of the branch box node; comparing the second identification devices of all branch box nodes one by one, and calculating father nodes of the third identification devices of all meter box nodes;
and sequentially analyzing the 2-32 harmonic content rate variable quantity, repeating the screening and analyzing steps, finally comparing the station area identification codes if a third identification device of a certain meter box has no father node, and setting the father node of the third identification device as the first identification device when the station area identification codes are consistent with the station area identification codes of the first identification device.
The invention also provides a low-voltage transformer area line-changing subscriber relation identification method which is implemented by the low-voltage transformer area line-changing subscriber relation identification system and comprises the following steps:
step S1, the first identification device acquires station area identification codes and installation information of all the second identification devices and all the third identification devices and harmonic data;
step S2, the first identification device screens out a second identification device whose platform identification code is consistent with the code sent by itself and whose installation information is a branch box, and sets a parent node of the second identification device as the first identification device;
and step S3, the first identification device screens out the father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification devices to form a variation, line and user topological relation graph of the distribution area.
Wherein the harmonic data is 1 minute period curve data of current 2-32 times of harmonic content on the previous day.
Wherein, the step S3 specifically includes:
step S31, the first recognition device extracts the harmonic data of a third recognition device at the meter box level from the storage one by one, screens out time nodes with the Nth harmonic content rate variation larger than a set value, and forms a three-dimensional grid graph with the Nth harmonic content rate variation, wherein the X axis represents the asset number of the third recognition device, the Y axis represents the time nodes with the Nth harmonic content rate variation exceeding the set value, and the Z axis represents the Nth harmonic content rate variation;
step S32, using the time node of the Y axis as a main key, screening out the only third identification device on the X axis, comparing the variation of the second identification device of a certain branch box node in the Nth harmonic content rate on the time node, and if the variation trend is the same and the variation difference is in the set value range, setting the second identification device of the branch box node as the father node of the third identification device of the branch box node; comparing the second identification devices of all branch box nodes one by one, and calculating father nodes of the third identification devices of all meter box nodes;
and step S33, sequentially analyzing the 2-32 harmonic content rate variation, repeating the screening and analyzing steps, finally comparing the station area identification codes if a third identification device of a certain meter box has no father node, and setting the father node of the third identification device as the first identification device when the station area identification codes are consistent with the station area identification codes of the first identification device.
The method comprises the following steps that a first identification device in a host mode is installed at a distribution and transformation outgoing line to sample three-phase voltage and current signals, and the content rate of each harmonic of the voltage and the current is calculated; installing a second recognition device of a slave mode at the inlet wire switch of each branch box to sample three-phase voltage and current signals at the position, and calculating the harmonic content of each time of the voltage and the current; and a third identification device in a slave mode is arranged at the inlet wire switch of each meter box to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current.
Wherein the first recognition device, the second recognition device and the third recognition device each include: the intelligent power line monitoring system comprises a main control module, a transformer area identification module, an alternating current sampling module, a high-speed power line carrier communication module, a power supply module and a maintenance interface module, wherein the alternating current sampling module adopts a 6-channel 24-bit AD sampling chip and a DSP scheme and is used for measuring and calculating three-phase voltage, current 2-32 harmonic amplitude and content rate and extracting variation of each harmonic content rate, and the high-speed power line carrier communication module is used for realizing clock synchronization among identification devices and sampling data transmission.
The method has the advantages that on the basis of carrier signal identification, alternating current sampling is added, harmonic data at the distribution and transformation line and the measured position are calculated, the characteristic curve of each harmonic is analyzed by adopting a harmonic analysis algorithm, the station area relation can be identified more accurately, the branch line relation is determined, and the transformer line user relation is further cleared.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a low-voltage transformer subscriber relationship identification system according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of an identification apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of a method for identifying a subscriber relationship of a low-voltage transformer area according to a second embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, an embodiment of the present invention provides a system for identifying a subscriber relationship of a low-voltage transformer area, including:
the first identification device is arranged at the distribution and transformation outlet, the second identification device is arranged at the inlet switch of each branch circuit branch box, and the third identification device is arranged at the inlet switch of each meter box;
the first identification device is used for acquiring station area identification codes and installation information of all the second identification devices and all the third identification devices and harmonic data, screening out second identification devices of which station area identification codes are consistent with codes sent by the second identification devices and installation information is branch boxes, and setting father nodes of the second identification devices as the first identification devices; and the first identification device is also used for screening out the father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification device to form a variable, line and household topological relation graph of the distribution area.
Specifically, please refer to fig. 2, in this embodiment, each of the first identification device, the second identification device, and the third identification device includes a main control module, a station area identification module, an ac sampling module, a high-speed power line carrier communication module, a power module, and a maintenance interface module. The alternating current sampling module adopts a 6-channel 24-bit high-precision AD sampling chip and DSP scheme, has high-speed sampling and calculating capacity, can measure and calculate data such as three-phase voltage, current amplitude of 2-32 harmonics, content rate and the like, extracts content rate change characteristics of each harmonic on the basis of the data, and determines a variable line user topological relation by comparing and analyzing an association relation. And the high-speed power line carrier (HPLC) module is used for realizing clock synchronization among the identification devices and sample data transmission.
And after the low-voltage transformer area is subjected to line outgoing from the distribution transformer, the low-voltage transformer area enters each branch box, and the low-voltage transformer area enters each meter box through the outgoing line of each branch box. A first identification device of a host machine mode is installed at a distribution and transformation outgoing line to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current. And a second identification device of a slave mode is arranged at the inlet switch of each branch box to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current. And a third identification device in a slave mode is arranged at the inlet wire switch of each meter box to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current. As an example, the first identification device may be mounted near the concentrator.
After a period of operation, the first identification device reads the station area identification codes and installation information (branch boxes and meter boxes) of all the second identification devices and all the third identification devices through the HPLC module. Then, the first identification device screens out a second identification device whose station identification code matches the code transmitted by itself and whose installation information is a branch box, and sets the parent node of the second identification device as the first identification device.
And the first identification device also reads harmonic data of all the second identification devices and all the third identification devices through an HPLC module, namely 1-minute periodic curve data of current 2-32 times of harmonic content rate on the previous day. The first recognition device extracts the harmonic data of a third recognition device at the meter box level from storage one by one, screens out time nodes with the Nth harmonic content rate variation larger than a set value, and forms a three-dimensional grid graph with the Nth harmonic content rate variation, wherein the X axis represents an asset number of the third recognition device, the Y axis represents the time nodes with the Nth harmonic content rate variation exceeding the set value, and the Z axis represents the Nth harmonic content rate variation.
And (3) taking the time node of the Y axis as a main key, and screening out the only third identification device on the X axis, namely, the variation of the harmonic content rate generated on the Nth harmonic of only one third identification device at a certain time point exceeds a set value. And comparing the variation of the second identification device of a certain branch box node in the Nth harmonic content rate at the time node, wherein the variation trends of the harmonic content rates of the respective times are completely consistent based on the identification devices on the same line, so that if the variation trends are the same and the variation difference value is within a set value range, the second identification device of the branch box node is the father node of the third identification device of the meter box node. And comparing the second identification devices of all branch box nodes one by one, and calculating the father nodes of the third identification devices of all meter box nodes.
And sequentially analyzing the 2-32 harmonic content rate variable quantity, repeating the screening and analyzing steps, finally comparing the station area identification codes if a third identification device of a certain meter box does not have a father node, and when the station area identification codes are consistent with those of the first identification device, indicating that the circuit of the meter box node does not pass through a branch box, and setting the father node of the third identification device as the first identification device.
Through the process, finally, in the first identification device, the second identification device and the third identification device of all slave modes have a father node, so that a topological relation graph of the transformer, the line and the user of the transformer area is formed.
Corresponding to the first embodiment of the present invention, a second embodiment of the present invention provides a low-voltage transformer area subscriber relationship identification method, which is implemented by the low-voltage transformer area subscriber relationship identification system according to the first embodiment of the present invention, and the low-voltage transformer area subscriber relationship identification method includes:
step S1, the first identification device acquires station area identification codes and installation information of all the second identification devices and all the third identification devices and harmonic data;
step S2, the first identification device screens out a second identification device whose platform identification code is consistent with the code sent by itself and whose installation information is a branch box, and sets a parent node of the second identification device as the first identification device;
and step S3, the first identification device screens out the father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification devices to form a variation, line and user topological relation graph of the distribution area.
Specifically, a first identification device of a host machine mode is installed at a distribution and transformation line, three-phase voltage and current signals are sampled, and the harmonic content of each time of the voltage and the current is calculated. And a second identification device of a slave mode is arranged at the inlet switch of each branch box to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current. And a third identification device in a slave mode is arranged at the inlet wire switch of each meter box to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current.
In step S1, after a certain period of time, the first identification device reads the station area identification codes and installation information (branch box, meter box) of all the second identification devices and all the third identification devices through the HPLC module, and reads the harmonic data of all the second identification devices and all the third identification devices, that is, the 1-minute periodic curve data of the current 2-32 times harmonic content rate on the previous day.
Step S3 specifically includes:
step S31, the first identification device extracts the harmonic data of a third identification device at the meter box level from the storage one by one, screens out time nodes with the Nth harmonic content rate variation larger than a set value, and forms a three-dimensional grid graph with the Nth harmonic content rate variation, wherein the X axis represents the asset number of the third identification device, the Y axis represents the time nodes with the Nth harmonic content rate variation exceeding the set value, and the Z axis represents the Nth harmonic content rate variation;
step S32, using the time node of the Y axis as a main key, screening out the only third identification device on the X axis, namely, the variation of the harmonic content rate exceeding the set value occurs on the Nth harmonic of one and only one third identification device on a certain time node; on the time node, comparing the variation of the second identification device of a certain branch box node in the Nth harmonic wave, if the variation trends are the same and the variation difference value is in the set value range, indicating that the second identification device of the branch box node is the father node of the third identification device of the meter box node, setting the second identification device of the branch box node as the father node of the third identification device of the meter box node; comparing the second identification devices of all branch box nodes one by one, and calculating father nodes of the third identification devices of all meter box nodes;
and step S33, sequentially analyzing the variation of the 2-32 order harmonic content rate, repeating the screening and analyzing steps, finally comparing the station area identification codes if the third identification device of a certain meter box has no father node, and setting the father node of the third identification device as the first identification device when the station area identification codes are consistent with the station area identification codes of the first identification device.
Through the steps, finally, one father node exists in the second recognition device and the third recognition device of all the slave modes in the first recognition device, and thus a change, line and home topological relation graph of the platform area is formed.
According to the embodiment of the invention, on the basis of carrier signal identification, the alternating current sampling is added, the harmonic data at the distribution and transformation line and the measured position are calculated, the characteristic curve of each harmonic is analyzed by adopting a harmonic analysis algorithm, the station area relationship can be more accurately identified, the branch line relationship is determined, and the transformation line user relationship is further cleared.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
1. A low-voltage transformer station line-change user relation identification system is characterized by comprising:
the first identification device is arranged at the distribution and transformation outlet, the second identification device is arranged at the inlet switch of each branch circuit branch box, and the third identification device is arranged at the inlet switch of each meter box;
the first identification device is used for acquiring station area identification codes and installation information of all the second identification devices and all the third identification devices and harmonic data, screening out second identification devices of which the station area identification codes are consistent with codes sent by the first identification devices and the installation information is a branch box, and setting a father node of each second identification device as the first identification device; the first identification device is also used for screening out father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification devices to form a variable, line and household topological relation graph of the transformer area;
the first identification device is further configured to screen out parent nodes of all the third identification devices according to the harmonic data of the second identification device and the harmonic data of the third identification device, and form a topological relation graph of a transformer, a line and a subscriber of the distribution room, specifically:
the first identification device extracts harmonic data of a third identification device at a meter box level from storage one by one, screens out time nodes with the Nth harmonic content rate variation larger than a set value, and forms a three-dimensional grid graph with the Nth harmonic content rate variation, wherein an X axis represents an asset number of the third identification device, a Y axis represents the time nodes with the Nth harmonic content rate variation exceeding the set value, and a Z axis represents the Nth harmonic content rate variation;
taking a time node of a Y axis as a main key, screening out a unique third identification device on the X axis, comparing the variation of the second identification device of a certain branch box node in the Nth harmonic content rate on the time node, and if the variation trend is the same and the variation difference value is within a set value range, setting the second identification device of the branch box node as a father node of the third identification device of the branch box node; comparing the second identification devices of all branch box nodes one by one, and calculating father nodes of the third identification devices of all meter box nodes;
and sequentially analyzing the 2-32 harmonic content rate variable quantity, repeating the screening and analyzing steps, finally comparing the station area identification codes if a third identification device of a certain meter box has no father node, and setting the father node of the third identification device as the first identification device when the station area identification codes are consistent with the station area identification codes of the first identification device.
2. The low voltage transformer area subscriber relationship identification system of claim 1, wherein the first identification means, the second identification means and the third identification means each comprise: the intelligent power line monitoring system comprises a main control module, a transformer area identification module, an alternating current sampling module, a high-speed power line carrier communication module, a power supply module and a maintenance interface module, wherein the alternating current sampling module adopts a 6-channel 24-bit AD sampling chip and a DSP scheme and is used for measuring and calculating three-phase voltage, current 2-32 harmonic amplitude and content rate and extracting variation of each harmonic content rate, and the high-speed power line carrier communication module is used for realizing clock synchronization among identification devices and sampling data transmission.
3. The system for identifying the relationship between the line-changing users in the low-voltage transformer area as claimed in claim 1, wherein the first identification device is used for sampling three-phase voltage and current signals at the distribution and transformation outgoing line and calculating the harmonic content rate of the voltage and the current, the second identification device is used for sampling three-phase voltage and current signals at the incoming line switch of each branch box and calculating the harmonic content rate of the voltage and the current, and the third identification device is used for sampling three-phase voltage and current signals at the incoming line switch of each meter box and calculating the harmonic content rate of the voltage and the current.
4. The low voltage transformer area subscriber relationship identification system of claim 3, wherein the first identification device is located proximate to the concentrator.
5. A low-voltage transformer area line-subscriber relationship identification method, implemented by the low-voltage transformer area line-subscriber relationship identification system of claim 1, the low-voltage transformer area line-subscriber relationship identification method comprising:
step S1, the first identification device acquires station area identification codes and installation information of all the second identification devices and all the third identification devices and harmonic data;
step S2, the first identification device screens out a second identification device whose platform identification code is consistent with the code sent by itself and whose installation information is a branch box, and sets a parent node of the second identification device as the first identification device;
step S3, the first identification device screens out the father nodes of all the third identification devices according to the harmonic data of the second identification device and the third identification devices to form a variation, line and user topological relation graph of the distribution area;
the step S3 specifically includes:
step S31, the first recognition device extracts the harmonic data of a third recognition device at the meter box level from the storage one by one, screens out time nodes with the Nth harmonic content rate variation larger than a set value, and forms a three-dimensional grid graph with the Nth harmonic content rate variation, wherein the X axis represents the asset number of the third recognition device, the Y axis represents the time nodes with the Nth harmonic content rate variation exceeding the set value, and the Z axis represents the Nth harmonic content rate variation;
step S32, using the time node of the Y axis as a main key, screening out the only third identification device on the X axis, comparing the variation of the second identification device of a certain branch box node in the Nth harmonic content rate on the time node, and if the variation trend is the same and the variation difference is in the set value range, setting the second identification device of the branch box node as the father node of the third identification device of the branch box node; comparing the second identification devices of all branch box nodes one by one, and calculating father nodes of the third identification devices of all meter box nodes;
and step S33, sequentially analyzing the 2-32 harmonic content rate variation, repeating the screening and analyzing steps, finally comparing the station area identification codes if a third identification device of a certain meter box has no father node, and setting the father node of the third identification device as the first identification device when the station area identification codes are consistent with the station area identification codes of the first identification device.
6. The low-voltage transformer area line-user relationship identification method as claimed in claim 5, wherein the harmonic data is 1 minute period curve data of current 2-32 times harmonic content rate on the previous day.
7. The method for identifying the relationship between the line and the user in the transformer area of the low-voltage transformer area as claimed in claim 5, wherein the first identification device of the host mode is installed at the distribution transformer outgoing line to sample the three-phase voltage and current signals and calculate the harmonic content of the voltage and the current; installing a second recognition device of a slave mode at the inlet wire switch of each branch box to sample three-phase voltage and current signals at the position, and calculating the harmonic content of each time of the voltage and the current; and a third identification device in a slave mode is arranged at the inlet wire switch of each meter box to sample three-phase voltage and current signals and calculate the harmonic content of each time of the voltage and the current.
8. The low-voltage transformer area subscriber relationship identification method according to claim 5, wherein the first identification device, the second identification device and the third identification device each comprise: the intelligent power line monitoring system comprises a main control module, a transformer area identification module, an alternating current sampling module, a high-speed power line carrier communication module, a power supply module and a maintenance interface module, wherein the alternating current sampling module adopts a 6-channel 24-bit AD sampling chip and a DSP scheme and is used for measuring and calculating three-phase voltage, current 2-32 harmonic amplitude and content rate and extracting variation of each harmonic content rate, and the high-speed power line carrier communication module is used for realizing clock synchronization among identification devices and sampling data transmission.
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| CN111505443B (en) * | 2020-05-13 | 2022-08-30 | 广州市奔流电力科技有限公司 | Low-voltage transformer area line-to-user relationship identification method and device and computer equipment |
| CN111817289B (en) * | 2020-06-08 | 2021-12-17 | 华南理工大学 | Low-voltage distribution station physical topology identification method, device, system, terminal and medium |
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| CN109406915A (en) * | 2018-12-14 | 2019-03-01 | 国家电网有限公司 | Low-voltage platform area family becomes relationship batch identification device and recognition methods |
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