CN211263669U - Edge computing system for power distribution network fault detection and positioning - Google Patents
Edge computing system for power distribution network fault detection and positioning Download PDFInfo
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- CN211263669U CN211263669U CN201922254750.2U CN201922254750U CN211263669U CN 211263669 U CN211263669 U CN 211263669U CN 201922254750 U CN201922254750 U CN 201922254750U CN 211263669 U CN211263669 U CN 211263669U
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Abstract
The utility model relates to an edge computing system for distribution network fault detection and location, including central processing unit, the crossing interconnect of voltage/electric current sampling module and central processing unit, the crossing interconnect of big dipper GPS location navigation module and central processing unit, the crossing interconnect of large capacity data buffer and central processing unit connects power management module, the crossing interconnect of first remote wireless communication ware and central processing unit, safe encryption and decryption module and the crossing interconnect of central processing unit, the crossing interconnect of second remote wireless communication ware and central processing unit. The utility model provides a distribution network fault characteristic weak be difficult to effectively trigger warning and distribution automation main website or distribution thing networking cloud platform lead to maintaining two difficult problems that difficulty, operational effect are poor because of access equipment is too much.
Description
Technical Field
The utility model relates to a distribution thing networking field especially relates to an edge computing system for distribution network fault detection and location.
Background
The working meeting of the state network 2019 formally provides that a ubiquitous power internet of things is built on the basis of a strong intelligent power grid, and the ubiquitous power internet of things is formed by combining three streams of energy source streams, service streams and data streams. The ubiquitous power internet of things comprises a sensing layer, a network layer, a platform layer and an application layer, modern information technologies such as 'big, cloud, object, moving and intelligent' are fully applied, all-object interconnection and man-machine interaction in all links of a power system are achieved, and the intelligent service system with the characteristics of comprehensive sensing of states, efficient information processing and convenient and flexible application is achieved.
The distribution thing networking is the novel power network form that traditional industrial technology and thing networking degree of depth fuse produced, realizes comprehensive perception, data fusion and the intelligent application of distribution network through distribution equipment's comprehensive interconnection, intercommunication, interoperation, satisfies the smart management of distribution network, supports the development of energy internet, is the distribution network of new generation. The method has the characteristics of plug and play of the terminal, wide interconnection of equipment, comprehensive state perception, upgrading of application mode, quick iteration of service and efficient utilization of resources.
The distribution network of 35kV and below operates in a neutral point ungrounded mode, and the main advantage is that when the system has single-phase instantaneous ground fault, the electric arc can be automatically extinguished; when single-phase permanent grounding occurs, the load can be cut off without power immediately, so that most of domestic power distribution networks of 35kV and below adopt the grounding mode.
But it has the disadvantage that it is difficult to identify which line is faulty when a single-phase permanent earth fault occurs. The non-grounded phase voltage is increased due to faults, the intermittent arc grounding can cause arc overvoltage, the system insulation is threatened, and the ground insulation breakdown can be caused to generate phase-to-phase faults due to long-time operation. Therefore, the fault line needs to be determined and the fault needs to be eliminated as soon as possible.
The market has been at present for fault indicators or sensors for power distribution network fault detection and location, but the following problems are prevalent:
1. the fault alarm starting element is unreasonable, and most of the fault alarm starting elements adopt a mode of electric field sudden change starting or phase current disturbance. The electric field sudden change starting mode is easily interfered by external factors (environment, climate and overhead line arrangement mode) and frequently operates mistakenly or fails to operate; the phase current disturbance mode is easily influenced by load fluctuation or motor starting and the like to frequently perform misoperation.
2. The fault indicators and the sensors are usually connected to a power distribution automatic master station or a power distribution internet of things cloud platform directly or through a collection unit (one collection unit corresponds to one set of indicators or sensors), fault recording data are uploaded, and fault research and judgment are carried out by the master station or the cloud platform. With the increase in the number, the master station or cloud platform is overwhelmed.
3. In addition, decision algorithms adopted by different manufacturers, different types of indicators and sensors are different, and a master station or a cloud platform must deploy one algorithm for each type, so that the maintenance is difficult, and the actual operation effect is extremely poor.
SUMMERY OF THE UTILITY MODEL
To solve the above technical problem, the present invention provides an edge computing system for power distribution network fault detection and location.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an edge computing system for power distribution network fault detection and localization,
comprises a Central Processing Unit (CPU),
the voltage/current sampling module is connected with the central processing unit in an intersecting manner and is used for sampling the zero sequence voltage of the bus and the neutral point grounding line current;
the Beidou/GPS positioning navigation module is connected with the central processing unit in an intersecting manner and is used for providing an accurate time tag for bus zero sequence voltage and neutral point grounding wire current sampling data;
the large-capacity data buffer is connected with the central processing unit in an intersecting way and is used for storing real-time bus zero-sequence voltage and neutral point grounding line current data in a set time range;
the power supply management module is connected with the central processing unit in an intersecting way and is used for realizing the power supply management of the central processing unit;
the first remote wireless communicator is connected with the central processing unit in an intersecting manner and is used for realizing data interaction between the edge computing system and the wide area synchronous intelligent sensor arranged on the line and collecting fault recording waves;
the safety encryption and decryption module is mutually connected with the central processing unit in an intersecting manner and is used for realizing the safety certification of accessing the distribution automation main station and the encryption and decryption of interactive data between the safety encryption and decryption module and the distribution automation main station;
and the second remote wireless communicator is mutually connected with the central processing unit in an intersecting manner and is used for realizing wireless data transmission between the edge computing system and the power distribution automation master station or the power distribution Internet of things cloud platform.
Preferably, the edge computing system for detecting and positioning the power distribution network fault is characterized in that the Ethernet port module and the central processing unit are mutually connected in an intersecting manner and used for providing wired communication access to a power distribution automation main station or a power distribution Internet of things cloud platform.
Preferably, in the edge computing system for power distribution network fault detection and location, the USB interface module is interconnected with the central processing unit, so as to upgrade an operating system and an application program of the edge computing system.
Preferably, in the edge computing system for power distribution network fault detection and location, the UART interface module is interconnected with the central processing unit, and is used for upgrading an operating system and an application program of the edge computing system and importing and exporting security certificates of the security encryption and decryption module.
Preferably, in the edge computing system for power distribution network fault detection and location, the central processor is a 32-bit high-performance processor.
Preferably, the edge computing system for detecting and positioning the power distribution network fault is installed in a transformer substation, and a power supply in the transformer substation, a secondary side zero sequence voltage signal of a voltage transformer PT and a neutral point grounding line current are taken.
Preferably, the edge computing system for detecting and locating the power distribution network fault is installed outside a substation and utilizes a power supply and a zero-sequence voltage secondary signal of a feeder terminal unit FTU existing in a line.
Preferably, the edge computing system for power distribution network fault detection and positioning is characterized in that the time interval between two continuous Beidou/GPS second pulse signals in the Beidou/GPS positioning navigation module is 1S.
Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:
1. the utility model provides an edge computing system has realized that the recorded wave of all equipment collects and judges on the spot under the same generating line section when the distribution network breaks down (including short-circuit fault, earth fault), finally only needs to upload to distribution automation main website or distribution thing networking cloud platform with fault alarm and location result. The access quantity and the data transmission quantity of the equipment of the master station or the cloud platform are reduced to the greatest extent, and the problems that the cloud platform of the distribution automatic master station or the distribution Internet of things faces heavy load and is difficult to maintain are solved.
2. The utility model discloses the zero sequence voltage who introduces differentiates whether there is single-phase earth fault's reliable criterion distribution network system as the dispatch, through synchronous technology as single-phase earth fault's wave recording start-up moment, can accurately carry out route selection and fault location through this moment whole net zero sequence current's the condition, thoroughly solved electric field trigger or the wrong report alarm that the phase current sudden change triggered, the problem of warning of leaking.
3. The utility model discloses the neutral grounding line electric current sudden change that introduces is particularly suitable for as the reliable criterion that whether single-phase earth fault exists in little resistance grounding system, through synchronous technology as single-phase earth fault's record wave start-up moment, can accurately carry out route selection and fault location through this moment whole net zero sequence current's the condition, and electric field variation is weak under thoroughly having solved little resistance grounding system, unable alarm problem.
4. The utility model discloses based on location navigation unit, including global positioning system or big dipper satellite navigation, guaranteed the accurate synchronization between each measuring point electric current of circuit and generating line zero sequence voltage, neutral grounding wire electric current, the error is no longer than 20 microseconds. The precision synchronous data is a precondition for ensuring that the fault can be correctly judged.
5. The utility model discloses well generating line zero sequence voltage and neutral point earth connection line current oscillography sampling support buffer memory 1 hour, can eliminate the influence that the wireless network short-term instability leads to communication interruption.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of an application of an embodiment of the present invention.
Fig. 2 is a functional diagram of a system according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Examples
As shown in figure 2 of the drawings, in which,
an edge computing system for detecting and positioning faults of a power distribution network starts a grounding fault alarm by monitoring sudden changes of bus zero-sequence voltage (aiming at a small-current grounding system) or sudden changes of neutral point grounding line current (aiming at a small-resistance grounding system), collects fault records of all wide-area synchronous intelligent sensors in the same bus area, and completes the research and judgment of the grounding fault; the edge computing unit also responds to the short-circuit fault alarm reported by the wide-area synchronous intelligent sensor to finish the study and judgment of the short-circuit fault. And finally, the judgment results of the short-circuit fault and the ground fault are uploaded to a power distribution automatic main station or a power distribution Internet of things cloud platform.
Specifically, the Central Processing Unit (CPU)301, which uses a 32-bit high performance processor, receives the output of the power management module 302 as a working power supply, and implements real-time sampling of the bus zero-sequence voltage and the neutral point earth line current by controlling the voltage/current sampling module 305, and then caches the sampled values in the large-capacity data buffer 306, and the central processing unit 301 determines whether a fault occurs according to the bus zero-sequence voltage or the neutral point earth line current sampled value, and once the fault occurs, adjusts the three-phase current waveform of the wide-area synchronous intelligent sensor on the same time line by controlling the first remote wireless communicator 303, so as to implement aggregation of fault record; after collecting the fault recording, the central processing unit 301 runs a fault judgment algorithm to realize fault line selection and positioning, and uploads a distribution automation master station or a distribution internet of things cloud platform through the security encryption and decryption module 307 and the second remote wireless communicator 308.
And the power management module 302 inputs a 220V alternating current power supply, the internal part of the power management module 302 completes the conversion to a 5V direct current power supply, and further generates working power supplies required by the central processing units of 3.3V, 1.8V, 1.0V and the like.
And the first remote wireless communicator 3031 is used for realizing interaction between the edge computing unit and a wide-area synchronous intelligent sensor installed on a line to realize fault recording collection.
The big dipper/GPS global positioning module 304 outputs an accurate pulse-per-second signal after the big dipper/GPS global positioning module 304 is powered on, and the pulse-per-second signal is input to the central processing unit 301 for controlling the voltage/current sampling module as a sampling counting reference. The pulse-per-second is an active high level pulse signal having a width of about 1 millisecond with a period of 1 second.
And a voltage/current sampling module 305 for sampling the bus zero sequence voltage and the neutral point grounding line current.
And the large-capacity data buffer 306 is used for storing the real-time bus zero-sequence voltage and neutral point grounding line current data in a set time range.
And the security encryption and decryption module 307 is used for realizing security authentication of access to the distribution automation main station and encryption and decryption of interactive data between the distribution automation main station and the distribution automation main station.
And the second long-distance wireless communicator 308 is used for realizing wireless data transmission between the edge computing system and the power distribution automation master station or the power distribution internet of things cloud platform.
The ethernet port module 309 is configured to provide a wired communication mode to access between the distribution automation master station or the distribution internet of things cloud platform.
A USB interface module 310. The method is used for realizing the upgrading of the operating system and the application program.
The UART interface module 311 is configured to upgrade an operating system and an application program, and import and export a security certificate of the security encryption/decryption module.
The utility model discloses well this system installation gets power, voltage transformer PT secondary side zero sequence voltage signal and neutral point earth wire current in the transformer substation.
The utility model discloses well this system installation utilizes existing feeder terminal unit FTU's of circuit power and zero sequence voltage secondary signal outside the transformer substation.
As shown in fig. 1, the method for detecting and positioning faults of the present invention comprises the following steps:
1. when the edge computing system 101 detects that the zero sequence voltage of the bus or the neutral point grounding line current has sudden change, the edge computing system 101 records the corresponding voltage or current waveform, and time marks are marked by using time information output by the Beidou/GPS global positioning system.
2. The edge computing system 101 sends a command for calling three-phase current waveforms at the same moment to a wide-area synchronous intelligent sensor 102 installed on a line under the same bus section, and collection and storage of fault recording are completed.
3. The edge computing system 101 synthesizes the three-phase current waveforms into zero-sequence current waveforms, and calls a fault studying and judging algorithm to realize local judgment of the fault.
4. The edge computing system 101 uploads the fault alarm information and the positioning result to a distribution automation master station or a distribution internet of things cloud platform 103.
The utility model discloses at least, have following advantage:
1. the utility model provides an edge computing system has realized that the recorded wave of all equipment collects and judges on the spot under the same generating line section when the distribution network breaks down (including short-circuit fault, earth fault), finally only needs to upload to distribution automation main website or distribution thing networking cloud platform with fault alarm and location result. The access quantity and the data transmission quantity of the equipment of the master station or the cloud platform are reduced to the greatest extent, and the problems that the cloud platform of the distribution automatic master station or the distribution Internet of things faces heavy load and is difficult to maintain are solved.
2. The utility model discloses the zero sequence voltage who introduces differentiates whether there is single-phase earth fault's reliable criterion distribution network system as the dispatch, through synchronous technology as single-phase earth fault's wave recording start-up moment, can accurately carry out route selection and fault location through this moment whole net zero sequence current's the condition, thoroughly solved electric field trigger or the wrong report alarm that the phase current sudden change triggered, the problem of warning of leaking.
3. The utility model discloses the neutral grounding line electric current sudden change that introduces is particularly suitable for as the reliable criterion that whether single-phase earth fault exists in little resistance grounding system, through synchronous technology as single-phase earth fault's record wave start-up moment, can accurately carry out route selection and fault location through this moment whole net zero sequence current's the condition, and electric field variation is weak under thoroughly having solved little resistance grounding system, unable alarm problem.
4. The utility model discloses based on location navigation unit, including global positioning system or big dipper satellite navigation, guaranteed the accurate synchronization between each measuring point electric current of circuit and generating line zero sequence voltage, neutral grounding wire electric current, the error is no longer than 20 microseconds. The precision synchronous data is a precondition for ensuring that the fault can be correctly judged.
5. The utility model discloses well generating line zero sequence voltage and neutral point earth connection line current oscillography sampling support buffer memory 1 hour, can eliminate the influence that the wireless network short-term instability leads to communication interruption.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An edge computing system for power distribution network fault detection and location, characterized by:
comprises a Central Processing Unit (CPU),
the voltage/current sampling module is connected with the central processing unit in an intersecting manner and is used for sampling the zero sequence voltage of the bus and the neutral point grounding line current;
the Beidou/GPS positioning navigation module is connected with the central processing unit in an intersecting manner and is used for providing an accurate time tag for bus zero sequence voltage and neutral point grounding wire current sampling data;
the large-capacity data buffer is connected with the central processing unit in an intersecting way and is used for storing real-time bus zero-sequence voltage and neutral point grounding line current data in a set time range;
the power supply management module is connected with the central processing unit in an intersecting way and is used for realizing the power supply management of the central processing unit;
the first remote wireless communicator is connected with the central processing unit in an intersecting manner and is used for realizing data interaction between the edge computing system and the wide area synchronous intelligent sensor arranged on the line and collecting fault recording waves;
the safety encryption and decryption module is mutually connected with the central processing unit in an intersecting manner and is used for realizing the safety certification of accessing the distribution automation main station and the encryption and decryption of interactive data between the safety encryption and decryption module and the distribution automation main station;
and the second remote wireless communicator is mutually connected with the central processing unit in an intersecting manner and is used for realizing wireless data transmission between the edge computing system and the power distribution automation master station or the power distribution Internet of things cloud platform.
2. An edge computing system for distribution network fault detection and localization as claimed in claim 1 wherein: the Ethernet port modules are mutually connected with the central processing unit in an intersecting manner and used for providing wired communication access to a power distribution automation main station or a power distribution Internet of things cloud platform.
3. An edge computing system for distribution network fault detection and localization as claimed in claim 1 wherein: and the USB interface module is mutually connected with the central processing unit in an intersecting way and is used for realizing the upgrading of the operating system and the application program of the edge computing system.
4. An edge computing system for distribution network fault detection and localization as claimed in claim 1 wherein: the UART interface module is mutually connected with the central processing unit in an intersecting way and is used for realizing the upgrading of the operating system and the application program of the edge computing system and the leading-in and leading-out of the security certificate of the security encryption and decryption module.
5. An edge computing system for distribution network fault detection and localization according to any of claims 1 to 4, characterized by: the central processing unit adopts a 32-bit high-performance processor.
6. An edge computing system for distribution network fault detection and localization as claimed in claim 5 wherein: the system is installed in a transformer substation, and a power supply in the transformer substation, a zero sequence voltage signal of a voltage transformer PT secondary side and neutral point grounding line current are taken.
7. An edge computing system for distribution network fault detection and localization as claimed in claim 5 wherein: the system is installed outside a transformer substation and utilizes a power supply and a zero sequence voltage secondary signal of an existing Feeder Terminal Unit (FTU) of a line.
8. An edge computing system for distribution network fault detection and localization as claimed in claim 1 wherein: and the time interval of two continuous Beidou/GPS second pulse signals in the Beidou/GPS positioning navigation module is 1S.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824300A (en) * | 2019-12-16 | 2020-02-21 | 苏州银蕨电力科技有限公司 | Edge computing system for power distribution network fault detection and positioning |
| CN112731056A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Ground fault judgment method based on fault indicator |
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2019
- 2019-12-16 CN CN201922254750.2U patent/CN211263669U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824300A (en) * | 2019-12-16 | 2020-02-21 | 苏州银蕨电力科技有限公司 | Edge computing system for power distribution network fault detection and positioning |
| CN112731056A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Ground fault judgment method based on fault indicator |
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