CN110994789B - Low-voltage distribution network topological relation on-line identification and monitoring method - Google Patents
Low-voltage distribution network topological relation on-line identification and monitoring method Download PDFInfo
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Abstract
The invention discloses a method for identifying and monitoring topological relation of a low-voltage distribution network on line, which comprises the following steps that firstly, an integrated controller sends a switching-on instruction to an identification current generator at the end of a user, and each branch current detector monitors current state information of a branch in real time and uploads the current state information to the integrated controller; step two, the integrated controller senses that the branch current detector of the branch has characteristic current flowing through and records an address code; then, other identification current generators are switched on one by one in a time-sharing manner; step three, the integrated controller completes the on-line identification and monitoring of the platform area topology through logic calculation according to the address code; on the basis of not changing the original circuit, the low-voltage distribution network topological structure is obtained by installing the integrated controller, the branch current detector and the identification current generator, the change of the distribution network topological structure can be monitored in real time on line, the low-voltage distribution network topological structure can be monitored and reported in real time, and the improvement of power supply reliability and the power grid operation and maintenance management level is facilitated.
Description
Technical Field
The invention relates to a method for identifying a topological structure of a power distribution network, in particular to a method for identifying and monitoring a topological relation of a low-voltage power distribution network on line.
Background
With the development of the ubiquitous power internet of things and the continuous improvement of the power quality requirements of users, how to improve the power supply reliability and the production management level of a power distribution network becomes a big problem in the power industry. The realization of data sharing and comprehensive utilization between marketing and operation and maintenance service systems becomes an effective way for solving the problem. The basic work is to establish a topological relation between a change line and an user, perfect account information of the low-voltage equipment, improve the information sharing degree of all departments of the power company, and further improve the power supply reliability and the operation and maintenance management level of the distribution network.
In a certain sense, the topological relation of the low-voltage distribution network refers to the topological relation among the outgoing lines from the low-voltage side of the distribution transformer → the low-voltage switch cabinet → each branch main switch → each user access point. Due to the reason of management and line transformation, the topological relation between outgoing lines of a distribution transformer and users of many old cells is unclear or incorrect, and corresponding signboards are lacked or are not clear in writing, so that certain difficulty is caused for establishing the topological relation of the low-voltage distribution network.
In addition, for a low-voltage power distribution network with a known topological structure, monitoring the change condition of the topological structure of the power supply network in time is also an important aspect of power grid operation and maintenance management.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-line identification and monitoring method for the topological relation of a low-voltage distribution network, which is convenient for establishing a clear topological relation of the low-voltage distribution network.
In order to solve the technical problems, the technical scheme of the invention is as follows: the low-voltage distribution network comprises a low-voltage incoming line switch layer, a low-voltage outgoing line switch layer, a plurality of branch line switch layers and a metering box user switch layer; the low-voltage incoming line switch layer is provided with an integrated controller; the low-voltage outlet switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the low-voltage outlet switches, the branch switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the branch switches, and the metering box user switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the metering box user switches and identification current generators which are in one-to-one correspondence with the user tail ends; the integrated controller, the branch current detector and the identification current generator are all provided with carrier communication modules for power carrier communication, and the branch current detector and the identification current generator are all provided with communication address codes and written into the integrated controller;
the online identification and monitoring method comprises the following steps:
step one, an integrated controller sends a switching-on instruction to an identification current generator at a user terminal, each branch current detector monitors current state information of a branch in real time, and the current information of the branch is uploaded to the integrated controller through a carrier communication module of the branch;
step two, the integrated controller senses that the branch current detectors of the branch have characteristic currents flowing through and records address codes of the branch current detectors flowing through the characteristic currents; then sending an opening instruction to the identification current generators at the tail ends of other users one by one in a time-sharing manner;
and step three, the integrated controller obtains the topological structure of the corresponding power supply area and the change condition of each branch circuit through logic calculation according to the address codes of the branch circuit current detectors through which the identification current generators and the characteristic currents flow, and completes online identification and monitoring of the topology of the area.
As a preferred technical scheme, a branch current detector is installed at a meter box switch outlet terminal of a meter box user switch layer, and the identification current generator is installed at a user tail end of the meter box user switch layer.
As a preferred technical solution, the identification current generator generates an identifiable characteristic current between the phase line and the zero line, where the characteristic current includes amplitude, phase, and variation characteristics of power frequency waveform distortion of the power frequency current.
As a preferred technical solution, the identification current generator includes a triac, an IGBT module, and a linear load.
As a preferable technical solution, the branch current detector includes an open-close type 0.5S class current transformer.
As a preferred technical solution, the centralized controller includes an embedded control module, a carrier communication module, and a bus current detection module.
As a preferred technical solution, the branch current detector includes an embedded control module, a branch current detection module, and a carrier communication module.
Due to the adoption of the technical scheme, the method for identifying and monitoring the topological relation of the low-voltage distribution network on line comprises the following steps: step one, an integrated controller sends a switching-on instruction to an identification current generator at a user terminal, each branch current detector monitors current state information of a branch in real time, and the current information of the branch is uploaded to the integrated controller through a carrier communication module of the branch; step two, the integrated controller senses that the branch current detectors of the branch have characteristic currents flowing through and records address codes of the branch current detectors flowing through the characteristic currents; then sending an opening instruction to the identification current generators at the tail ends of other users one by one in a time-sharing manner; step three, the integrated controller obtains the topological structure of the corresponding power supply area and the change condition of each branch circuit through logic calculation according to the address codes of the branch circuit current detectors through which the identification current generators and the characteristic currents flow, and completes online identification and monitoring of the topology of the area; on the basis of not changing the original circuit, the low-voltage distribution network topological structure is obtained by installing the integrated controller at the main switch and respectively installing the branch current detector and the identification current generator at the tail end of each branch and the distribution network user, the change of the distribution network topological structure can be monitored in real time on line, the low-voltage distribution network topological structure can be monitored and reported in real time, and the improvement of the power supply reliability and the power grid operation and maintenance management level is facilitated.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic circuit diagram of an embodiment of the present invention;
in the figure: 11-low voltage incoming line switch; 12-low voltage outlet switch; 13-a branch line switch; 14-batch tank switch.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1, the low-voltage distribution network topology relation online identification and monitoring method includes that the low-voltage distribution network includes a low-voltage incoming line switch layer, a low-voltage outgoing line switch layer, a plurality of branch line switch layers and a metering box user switch layer; the low-voltage incoming line switch layer is provided with an integrated controller; the low-voltage outgoing line switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the low-voltage outgoing line switches 12, the branch line switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the branch line switches 13, and the metering box user switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the metering box user switches and identification current generators which are in one-to-one correspondence with the user tail ends; the integrated controller, branch current detector with discernment current generator all disposes the carrier communication module that is used for power line carrier communication, branch current detector with discernment current generator is provided with communication address code and writes into in the integrated controller.
The online identification and monitoring method comprises the following steps:
step one, an integrated controller sends a switching-on instruction to an identification current generator at a user terminal, each branch current detector monitors current state information of a branch in real time, and the current information of the branch is uploaded to the integrated controller through a carrier communication module of the branch;
step two, the integrated controller senses that the branch current detectors of the branch have characteristic currents flowing through and records address codes of the branch current detectors flowing through the characteristic currents; then sending an opening instruction to the identification current generators at the tail ends of other users one by one in a time-sharing manner;
and step three, the integrated controller obtains the topological structure of the corresponding power supply area and the change condition of each branch circuit through logic calculation according to the address codes of the branch circuit current detectors through which the identification current generators and the characteristic currents flow, and completes online identification and monitoring of the topology of the area.
And a branch current detector is installed at the outlet end of a metering box switch 14 of the metering box user switch layer, and the identification current generator is installed at the end of a user of the metering box user switch layer. The identification current generator generates identifiable characteristic current between the phase line and the zero line, and the characteristic current comprises amplitude, phase and change characteristics of power frequency waveform distortion of the power frequency current. The identification current generator comprises a bidirectional thyristor, an IGBT module and a linear load; the method for identifying the change of the power frequency current of the current generator specifically comprises the following specific implementation modes:
1. a linear load is controlled to be connected with the phase line and the zero line by using the bidirectional thyristor, and the amplitude of the identification current can be changed by adjusting the load;
2. a bidirectional thyristor is used for controlling and connecting a capacitor or an inductive load on a phase line and a zero line, and the phase angle and the amplitude of the identification current can be changed by adjusting the load;
3. and controlling the IGBT module to synchronously generate a plurality of pulses with the power frequency on the loads of the phase line and the zero line so as to adjust the waveform distortion of the power frequency current.
The branch current detector comprises an open-close type 0.5S-level current transformer. The integrated controller comprises an embedded control module, a carrier communication module and a bus current detection module. The branch current detector comprises an embedded control module, a branch current detection module and a carrier communication module.
The low-voltage output of the user transformer is controlled by one-stage or multi-stage switches, the switches are used as dividing lines, if the branch at the tail end of the connected load is set to be n layers, the topological structure of the low-voltage power supply network can be divided into K0, K1, K2, K3 and K4 … … Kn-1 layers according to the level of the control switch, and one or more power supply branches can be connected below each switch. In order to explain the principle of the invention, the low-voltage power supply topological structure is divided into four layers for explanation, namely a low-voltage incoming line switch layer, a low-voltage outgoing line switch layer, a branch line switch layer and a metering box user switch layer.
The method for on-line identifying and monitoring the topological relation of the low-voltage distribution network has the following characteristics:
1. under the condition that each part has power line carrier communication, a centralized controller is installed at the incoming line end of a low-voltage incoming line switch 11 of a low-voltage incoming line switch layer; a branch current detector is arranged at the wire inlet end of a low-voltage wire outlet switch 12 of the low-voltage wire outlet switch layer, and a branch current detector is arranged at the wire outlet end of a branch switch 13 of the branch switch layer; a branch current detector is arranged at the outlet end of a metering box switch 14 of a user switch of the metering box; and installing an identification current generator at the end of a power distribution network user.
2. The identification current generator is arranged on a branch at the tail end of the power distribution network, and generates characteristic current which is easy to identify between a phase line and a zero line, wherein the characteristic current comprises amplitude, phase and change characteristics of power frequency waveform distortion of the power frequency current;
3. the integrated controller, each branch current detector and the tail end identification current generator are all provided with a power line carrier communication module and communicate through a power supply circuit of the transformer area.
4. The branch current detector detects current by adopting an open-close type 0.5S-level current transformer, and can detect the amplitude, the phase and the change characteristics of power frequency waveform distortion of the branch power frequency current;
5. the branch current detector and the distribution network tail end identification current generator which are arranged on each branch have definite communication address codes.
The integrated controller sends an opening instruction to the tail end identification current generators of the power distribution network, then detects whether characteristic current flows through the branch circuits of each branch circuit current detector one by one, and after all the tail end identification current generators are started one by one in a time-sharing mode, the topological structure of the power supply network is determined by utilizing a logical relation through collecting data of the branch circuits through which the characteristic current flows.
On the basis of not changing the original circuit, the integrated controller is installed at the main switch, and the branch current detectors and the current generators are respectively installed at the tail ends of the branches and the power distribution network, so that the low-voltage power distribution network topological structure is obtained, the change of the power distribution network topological structure can be monitored in real time on line, the low-voltage power distribution network topological structure can be monitored and reported in real time, and the improvement of the power supply reliability and the power grid operation and maintenance management level is facilitated.
The integrated controller, the branch current detector and the identification current generator all have an online installation function.
The principle of online current identification and monitoring is illustrated by way of example in fig. 1. The integrated controller at the wire inlet end of the bus switch K0 sends a switching-on instruction to the identification current generator of the user branch K41, each branch current detector monitors the current state information of the branch in real time, the current information of the branch is uploaded to the integrated controller through a carrier communication module, and the integrated controller senses that the branch current detectors of K11, K21 and K31 have characteristic current flowing through and records the address code of each branch current detector flowing through the characteristic current; and then sending an opening instruction to the identification current generators K42-K46 one by one in a time-sharing manner. The centralized controller obtains the topological structure of the corresponding power supply area and the change condition of each branch circuit through logic calculation according to the address codes of the branch circuit current detectors through which the identification current generator and the characteristic current flow, and completes the online identification and monitoring of the topology of the area.
For a distribution area with an unknown power supply topological structure, an integrated controller, a branch current detector and a terminal user layer identification current generator can be installed on a line, all branches are opened one by one from the terminal branches of the power distribution network, and the current power supply network topological structure can be confirmed according to the logical relationship through the cooperation of switches at all levels.
The integrated controller, the branch detector and the branch characteristic current generator for bus data acquisition all adopt a multifunctional open-close type combined transformer (patent application number: 201910981923.2), so that the current transformer can be easily installed, puncture insulation electricity taking can be facilitated, and only a zero line needs to be connected with a lead.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The low-voltage distribution network topology relation online identification and monitoring method is characterized in that the low-voltage distribution network comprises a low-voltage incoming line switch layer, a low-voltage outgoing line switch layer, a plurality of branch line switch layers and a metering box user switch layer; the low-voltage incoming line switch layer is provided with an integrated controller; the low-voltage outlet switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the low-voltage outlet switches, the branch switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the branch switches, and the metering box user switch layer is provided with a plurality of branch current detectors which are in one-to-one correspondence with the metering box user switches and identification current generators which are in one-to-one correspondence with the user tail ends; the integrated controller, the branch current detector and the identification current generator are all provided with carrier communication modules for power carrier communication, and the branch current detector and the identification current generator are all provided with communication address codes and written into the integrated controller;
the online identification and monitoring method comprises the following steps:
step one, an integrated controller sends a switching-on instruction to an identification current generator at a user terminal, each branch current detector monitors current state information of a branch in real time, and the current information of the branch is uploaded to the integrated controller through a carrier communication module of the branch;
step two, the integrated controller senses that the branch current detectors of the branch have characteristic currents flowing through and records address codes of the branch current detectors flowing through the characteristic currents; then sending an opening instruction to the identification current generators at the tail ends of other users one by one in a time-sharing manner;
step three, the integrated controller obtains the topological structure of the corresponding power supply area and the change condition of each branch circuit through logic calculation according to the address codes of the branch circuit current detectors through which the identification current generators and the characteristic currents flow, and completes online identification and monitoring of the topology of the area;
a branch current detector is arranged at a metering box switch outlet end of the metering box user switch layer, and the identification current generator is arranged at a user tail end of the metering box user switch layer;
the identification current generator generates identifiable characteristic current between the phase line and the zero line, and the characteristic current comprises amplitude, phase and change characteristics of power frequency waveform distortion of the power frequency current.
2. The low-voltage distribution network topological relation on-line identification and monitoring method according to claim 1, characterized in that: the identification current generator comprises a bidirectional thyristor, an IGBT module and a linear load.
3. The low-voltage distribution network topological relation on-line identification and monitoring method according to claim 1, characterized in that: the branch current detector comprises an open-close type 0.5S-level current transformer.
4. The low-voltage distribution network topological relation on-line identification and monitoring method according to claim 1, characterized in that: the integrated controller comprises an embedded control module, a carrier communication module and a bus current detection module.
5. The on-line identification and monitoring method for topological relations of a low-voltage distribution network according to any one of claims 1 to 4, characterized in that: the branch current detector comprises an embedded control module, a branch current detection module and a carrier communication module.
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| CN112165171A (en) * | 2020-10-10 | 2021-01-01 | 江苏方天电力技术有限公司 | Method for identifying topology of low-voltage distribution station area |
| CN114650081A (en) * | 2020-12-18 | 2022-06-21 | 华为技术有限公司 | Line topology identification method and device |
| CN112946385B (en) * | 2021-01-29 | 2021-11-16 | 国网浙江省电力有限公司营销服务中心 | Transformer area power failure point positioning method based on circuit breaker |
| CN112968520B (en) * | 2021-01-29 | 2021-11-16 | 国网浙江省电力有限公司营销服务中心 | Transformer area topology identification method based on transformer area key node characteristic current information |
| CN113092925B (en) * | 2021-05-08 | 2022-12-06 | 辽宁汉华信息工程有限公司 | Power distribution network topological structure recognition device |
| CN113312734B (en) * | 2021-05-12 | 2023-07-04 | 广东顺畅科技有限公司 | Ammeter network topology generation method and device and computer readable storage medium |
| CN113809820B (en) * | 2021-07-30 | 2022-04-29 | 北京智芯微电子科技有限公司 | Method, device, system, medium and signal encoding method for identifying platform zone topology |
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