CN111463783A - Low-voltage distribution network topology identification and fault positioning device and application method - Google Patents
Low-voltage distribution network topology identification and fault positioning device and application method Download PDFInfo
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- CN111463783A CN111463783A CN202010360754.3A CN202010360754A CN111463783A CN 111463783 A CN111463783 A CN 111463783A CN 202010360754 A CN202010360754 A CN 202010360754A CN 111463783 A CN111463783 A CN 111463783A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a topology identification and fault positioning device for a power distribution network in a low-voltage distribution area and an application method thereof, wherein the device comprises an upper computer and a lower computer which are arranged between an N line and a PE line of a distribution line; the upper computer comprises a communication module, a sensor and a current loop information receiving module; the lower computer comprises a communication module, a sensor, a current loop information receiving module and a functional circuit module; the communication module realizes normal state communication through a communication interface; the sensors are all arranged on the N line and used for receiving current signals of the line; the current loop information receiving module is connected with the corresponding sensor and used for identifying and analyzing the received current signal; the functional circuit module is used for loading the characteristic pulse current to the PE wire through the N wire. The invention can effectively transmit information when a switch is disconnected, equipment is tripped or a primary load of a power distribution network line is changed, and quickly locate a fault position when a low-voltage line has a fault.
Description
Technical Field
The invention relates to the field of power communication, in particular to a topology identification and fault positioning device for a power distribution network in a low-voltage distribution area and an application method.
Background
At present, in the aspects of low-voltage line maintenance, power consumption management and electric energy reading, the electric power marketing and operation inspection departments in China need to accurately determine the affiliation relationship of the affiliation power supply area and the phase attribute of each electric energy meter user and equipment such as branch switches, power distribution terminals, distribution transformers and the like, so as to provide real and accurate basic data for the refined management of the distribution transformer area.
The electric energy marketing department needs to collect and copy centralized electricity utilization data, so that the working efficiency and the working convenience for distinguishing the affiliation power supply area and the phase attribute of an electric energy meter user on site are improved; the operation and inspection department also needs to be capable of rapidly positioning the fault position and the fault section when the low-voltage line is maintained, the line loss is calculated and the low-voltage line is in fault, so as to guide the fault first-aid repair.
However, the platform area topology identification and fault location generally applied in the power industry at present are realized based on various communication technologies in combination with modes of adding special current signals and the like, and the main design basis is that different technical means are used between L lines and N lines to realize topology identification and fault location, so that the problems of high equipment cost, complex technology, low accuracy and incapability of realizing fault location of a low-voltage power distribution network exist.
Disclosure of Invention
In order to solve the technical problems, the invention provides a topology identification and fault location device for a power distribution network in a low-voltage distribution area and an application method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a topology identification and fault positioning device for a power distribution network in a low-voltage distribution area comprises an upper computer and a lower computer which are arranged between an N line and a PE line of a power distribution line;
the upper computer comprises a communication module, a sensor and a current loop information receiving module;
the lower computer comprises a communication module, a sensor, a current loop information receiving module and a functional circuit module;
the communication module realizes normal state communication through a communication interface;
the sensors are all arranged on the N line and used for receiving current signals of the line;
the current loop information receiving module is connected with the corresponding sensor and used for identifying and analyzing the received current signal;
the functional circuit module is used for loading the characteristic pulse current to the PE wire through the N wire.
Further, the upper computer is installed on the low-voltage line side of the transformer area.
Furthermore, the lower computer is connected to a low-voltage distribution network line section point or a user electric energy meter.
Further, the low-voltage distribution network is a TN-S low-voltage distribution system or a TT low-voltage distribution system.
Furthermore, the upper computer realizes the time synchronization function, the sequential numbering function and the parameter setting function for the lower computer through the communication interface.
Furthermore, the lower computer also comprises a backup power supply module which is used for maintaining normal operation in a power failure state.
The invention also provides a method for identifying the topology of the power distribution network in the low-voltage transformer area, which comprises the following steps:
the upper computer sends a characteristic pulse current loading command to any lower computer through a communication interface;
a functional circuit module of the lower computer loads a characteristic pulse current;
the sensors of the upper computer and other lower computers receive the characteristic pulse current information;
and the upper computer collects the current information identified by other lower computers, and determines the power supply topology of the lower computer according to the current information.
The invention also provides a method for positioning the fault of the power distribution network in the low-voltage distribution area, which comprises the following steps:
when the lower computer detects the AC power failure, the characteristic pulse current information is loaded through the functional circuit module;
a sensor of the upper computer receives characteristic pulse current information;
and the upper computer judges the fault position according to the identified current information.
Further, when the lower computer detects an ac power failure, the lower computer transmits the pulse current information after delaying a predetermined time based on the code number assigned in advance by the upper computer.
The invention has the beneficial effects that:
the invention provides a topology identification and fault positioning device for a power distribution network in a low-voltage transformer area and an application method thereof, which fully utilize the characteristics of a current loop and the current low-voltage communication technology to realize the setting of the working state and the parameter reading of the identification and positioning device when the power supply is normal and realize the information uploading in various states such as normal, fault and the like.
When the electric energy marketing department collects and copies the electricity consumption data, the working efficiency and the working convenience for identifying the affiliation power supply area and the phase attribute of the electric energy meter user on site can be improved; the establishment of the topological power supply connection relation of the low-voltage power supply circuit of a single distribution area can be quickly realized; when the low-voltage line is maintained, the line loss is calculated and the low-voltage line is in fault, the operation inspection department can quickly locate the fault position and the fault section and guide the fault first-aid repair.
In the invention, the upper computer and the lower computer are arranged between the N line and the PE line of the distribution line, and the N line and the PE line are in a primary loop without break points, so that the problem that information is not effectively transmitted due to the disconnection of an L line switch or equipment tripping and the problem that information cannot be effectively transmitted due to primary load change or interference and short circuit of a distribution network line do not exist, the information is uploaded to the upper computer from the lower computer, the high-efficiency and accurate topology identification and fault positioning work of a transformer area is achieved, and the field operation difficulty is greatly simplified.
Drawings
FIG. 1 is a schematic connection diagram of an embodiment of a topology identification and fault location device for a distribution network of a low-voltage distribution area according to the present invention;
FIG. 2 is a schematic connection diagram of a topology identification and fault location device for a distribution network in a low-voltage distribution area according to a second embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for identifying topology of a distribution network in a low-voltage distribution area according to the present invention;
fig. 4 is a schematic flow chart of a method for positioning a fault of a power distribution network in a low-voltage distribution area according to the invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
As shown in fig. 1, a first embodiment of the present invention discloses a topology identification and fault location device for a distribution network in a low-voltage distribution area, which includes an upper computer and a lower computer installed between an N line and a PE line of a distribution line; specifically, the upper computer is arranged on the low-voltage outgoing line side of the distribution transformer in the transformer area, and a low-voltage three-phase four-wire voltage line connection mode is adopted; the lower computer is connected to a power distribution network line section point or a user electric energy meter in a low-voltage distribution area in a single/three-phase voltage connection mode.
The upper computer comprises a communication module, a sensor and a current loop information receiving module; the lower computer comprises a communication module, a sensor, a current loop information receiving module and a functional circuit module.
The communication module realizes normal state communication through a communication interface; specifically, the communication module can adopt low-voltage carrier, wireless and wired communication technologies and the like; the communication module of host computer realizes the normal state communication of host computer down with the next computer, and various management functions such as can be realized to the next computer to the host computer accessible communication interface: a time synchronization function, a sequential numbering function, a parameter setting function, etc.
The communication module of the lower computer can also realize normal communication with the upper computer.
The sensors are all arranged on the N line and used for receiving current signals of the line; specifically, the upper computer sensor receives pulse current signals sent by each lower computer, and the lower computer sensor receives pulse current signals sent by a later-stage lower computer on a power supply line of the lower computer.
The current loop information receiving module is connected with the corresponding sensor and used for identifying and analyzing the received current signal;
the functional circuit module is used for loading characteristic pulse current to the PE wire through the N wire; specifically, when receiving an upper computer command or power failure, the functional circuit module loads the characteristic pulse current to realize the function of sending N-line characteristic current loop information between the N line and the PE line.
Preferably, the lower computer further comprises a backup power module, and the backup power module is used for maintaining normal work in a power failure state and can realize normal work for 5 minutes in the power failure state.
It should be noted that, in the first embodiment of the low-voltage distribution network topology identification and fault location device shown in fig. 1, the low-voltage distribution network in the low-voltage distribution network is a TN-S low-voltage distribution system, but the low-voltage distribution network applicable to the low-voltage distribution network topology identification and fault location device in the present invention includes, but is not limited to, a TN-S low-voltage distribution system, for example, fig. 2 is a schematic access connection diagram of a TT low-voltage distribution system of the low-voltage distribution network topology identification and fault location device shown in the second embodiment of the present invention.
The invention also discloses a method for identifying the topology of the low-voltage distribution network, and fig. 3 is a flow schematic diagram of the method for identifying the topology of the low-voltage distribution network.
The method for identifying the topology of the power distribution network in the low-voltage transformer area comprises the following steps:
the upper computer sends a characteristic pulse current loading command to any lower computer through a communication interface;
a functional circuit module of the lower computer loads a characteristic pulse current;
the sensors of the upper computer and other lower computers receive the characteristic pulse current information;
and the upper computer collects the current information identified by other lower computers, and determines the power supply topology of the lower computer according to the current information.
Specifically, after the sensor of the lower computer receives and identifies the current information, the identified characteristic pulse current information is uploaded after the collection command of the upper computer is received, the upper computer collects the current information identified by other lower computers through the communication interface, and the power supply topology condition of the lower computer can be determined according to the received pulse current information condition of the lower computer.
The upper computer commands the lower computers to load the characteristic pulse current signals one by repeating the operations, and then collects the information identified by each lower computer, so that the topology identification of the low-voltage transformer area is realized.
The invention also discloses a low-voltage distribution network fault positioning method, and fig. 4 is a flow schematic diagram of the low-voltage distribution network fault positioning method.
The method for positioning the fault of the power distribution network in the low-voltage transformer area comprises the following steps:
when the lower computer detects the AC power failure, the characteristic pulse current information is loaded through the functional circuit module;
a sensor of the upper computer receives characteristic pulse current information;
and the upper computer judges the fault position according to the identified current information.
Preferably, when the lower computer detects the ac power failure, the pulse current information is transmitted after delaying a preset specified time according to a code number pre-assigned by the upper computer.
Specifically, the upper computer and each lower computer agree different characteristic pulse current information in advance according to the coding serial number, when a fault power failure occurs, the lower computer sensor sends the agreed characteristic pulse current information and reports the power failure information to the upper computer, and after the upper computer receives the characteristic pulse current information, the upper computer integrates the information reported by other lower computers, so that the fault position can be judged quickly.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto. Various modifications and alterations will occur to those skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. On the basis of the technical scheme of the invention, various modifications or changes which can be made by a person skilled in the art without creative efforts are still within the protection scope of the invention.
Claims (9)
1. A topology identification and fault positioning device for a power distribution network in a low-voltage distribution area is characterized by comprising an upper computer and a lower computer which are arranged between an N line and a PE line of a power distribution line;
the upper computer comprises a communication module, a sensor and a current loop information receiving module;
the lower computer comprises a communication module, a sensor, a current loop information receiving module and a functional circuit module;
the communication module realizes normal state communication through a communication interface;
the sensors are all arranged on the N line and used for receiving current signals of the line;
the current loop information receiving module is connected with the corresponding sensor and used for identifying and analyzing the received current signal;
the functional circuit module is used for loading the characteristic pulse current to the PE wire through the N wire.
2. The low-voltage distribution network topology identification and fault location device of claim 1, wherein the upper computer is installed on the low-voltage outgoing line side of the distribution transformer of the distribution area.
3. The low-voltage distribution network topology identification and fault location device of claim 1, wherein the lower computer is connected to a low-voltage distribution network line segment point or a user electric energy meter.
4. The low-voltage distribution network topology identification and fault location device of claim 1, wherein the low-voltage distribution network is a TN-S low-voltage distribution system or a TT low-voltage distribution system.
5. The low-voltage distribution network topology identification and fault location device of claim 1, wherein the upper computer implements a time synchronization function, a sequential numbering function, and a parameter setting function on the lower computer through the communication interface.
6. The low-voltage distribution network topology identification and fault location device of claim 1, wherein the lower computer further comprises a backup power module for maintaining normal operation in a power outage state.
7. A topology identification method for a power distribution network in a low-voltage distribution area is characterized by comprising the following steps:
the upper computer sends a characteristic pulse current loading command to any lower computer through a communication interface;
a functional circuit module of the lower computer loads a characteristic pulse current;
the sensors of the upper computer and other lower computers receive the characteristic pulse current information;
and the upper computer collects the current information identified by other lower computers, and determines the power supply topology of the lower computer according to the current information.
8. A fault positioning method for a power distribution network in a low-voltage distribution area is characterized by comprising the following steps:
when the lower computer detects the AC power failure, the characteristic pulse current information is loaded through the functional circuit module;
a sensor of the upper computer receives characteristic pulse current information;
and the upper computer judges the fault position according to the identified current information.
9. The method according to claim 8, wherein the lower computer transmits the pulse current information after delaying a predetermined time according to a code number previously assigned by the upper computer when the lower computer detects the ac power failure.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112734594A (en) * | 2020-12-29 | 2021-04-30 | 国网北京市电力公司 | Low-voltage user power supply reliability research system |
| CN113406443A (en) * | 2021-08-02 | 2021-09-17 | 广东电网有限责任公司东莞供电局 | Low-voltage transformer area fault accurate positioning system and method |
| CN113809820A (en) * | 2021-07-30 | 2021-12-17 | 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1069665A2 (en) * | 1999-07-14 | 2001-01-17 | Equipmake Ltd. | Power transmission line and method of control |
| CN104460398A (en) * | 2013-09-17 | 2015-03-25 | 天津赛思科技发展有限公司 | Fault indicator control unit for detecting 10KV distribution lines |
| CN108828404A (en) * | 2018-05-09 | 2018-11-16 | 国网浙江省电力有限公司电力科学研究院 | Low-voltage platform area electric topology identification system and method for fast failure positioning |
| CN109494715A (en) * | 2018-11-13 | 2019-03-19 | 国电南瑞南京控制系统有限公司 | A kind of low-voltage power distribution station area electrical network topology Dynamic Identification system and method |
| CN109525285A (en) * | 2018-11-13 | 2019-03-26 | 国网江苏省电力有限公司电力科学研究院 | A kind of Power Line Carrier Communication Module with power network topology perceptional function |
| CN110932396A (en) * | 2019-11-26 | 2020-03-27 | 山东电亮亮信息科技有限公司 | Low-voltage distribution network topology identification system based on pulse characteristic current signals |
-
2020
- 2020-04-29 CN CN202010360754.3A patent/CN111463783B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1069665A2 (en) * | 1999-07-14 | 2001-01-17 | Equipmake Ltd. | Power transmission line and method of control |
| CN104460398A (en) * | 2013-09-17 | 2015-03-25 | 天津赛思科技发展有限公司 | Fault indicator control unit for detecting 10KV distribution lines |
| CN108828404A (en) * | 2018-05-09 | 2018-11-16 | 国网浙江省电力有限公司电力科学研究院 | Low-voltage platform area electric topology identification system and method for fast failure positioning |
| CN109494715A (en) * | 2018-11-13 | 2019-03-19 | 国电南瑞南京控制系统有限公司 | A kind of low-voltage power distribution station area electrical network topology Dynamic Identification system and method |
| CN109525285A (en) * | 2018-11-13 | 2019-03-26 | 国网江苏省电力有限公司电力科学研究院 | A kind of Power Line Carrier Communication Module with power network topology perceptional function |
| CN110932396A (en) * | 2019-11-26 | 2020-03-27 | 山东电亮亮信息科技有限公司 | Low-voltage distribution network topology identification system based on pulse characteristic current signals |
Non-Patent Citations (2)
| Title |
|---|
| YINGFEI WANG ET AL.: "Topology Identification in Two-Layer Complex Dynamical Networks", 《IEEE TRANSACTIONS ON NETWORK SCIENCE AND ENGINEERING》 * |
| 陈霄等: "小波变换在供电网络拓扑辨识波形特征提取中的应用", 《电子设计工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112734594A (en) * | 2020-12-29 | 2021-04-30 | 国网北京市电力公司 | Low-voltage user power supply reliability research system |
| CN112734594B (en) * | 2020-12-29 | 2024-05-28 | 国网北京市电力公司 | Low-voltage user power supply reliability research system |
| CN113809820A (en) * | 2021-07-30 | 2021-12-17 | 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 |
| CN113406443A (en) * | 2021-08-02 | 2021-09-17 | 广东电网有限责任公司东莞供电局 | Low-voltage transformer area fault accurate positioning system and method |
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