CN113671309B - Fault point detection and location method for distribution network - Google Patents
Fault point detection and location method for distribution network Download PDFInfo
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Abstract
The application relates to a fault point detection and positioning method for a power distribution network. The method comprises the steps of (1) detecting current amplitude, (2) detecting whether the detection time is received or not, (3) obtaining the first fault information and the second fault information, obtaining the current cycle information of N detection nodes according to the detection time, and (4) judging whether a ground fault occurs or not and calculating a fault distance according to the current cycle information and the detection time. According to the scheme provided by the application, through monitoring the current amplitude in the line in real time, when the current amplitude exceeds the preset threshold value, the detection device respectively sends information to the upper system and the other phase detection devices of the same detection node, and the upper system determines the fault line and the accurate position of the fault point on the fault line through the current cycle information and the corresponding detection time, so that the on-line monitoring of the fault point of the power distribution network is realized.
Description
Technical Field
The application relates to the technical field of control and automation of power systems, in particular to a fault point detection and positioning method of a power distribution network.
Background
The distribution network line has complex structure, multiple branches and long branch lines, and when faults occur, the positions of faults are determined by manually carrying out line inspection on line by line or an online monitoring system for faults of the distribution network line. The manual line inspection mode is long in time consumption and low in efficiency.
The distribution network line fault on-line monitoring system in the prior art is based on zero sequence voltage as a fault starting element, but faces the problem that the zero sequence voltage is difficult to collect for an overhead transmission line, and can only realize 'section' positioning of faults, but accurate positioning of fault points also requires manual line inspection and searching, and has long power failure time and labor waste.
Disclosure of Invention
In order to overcome the problems in the related art, the application provides a method for detecting and positioning a fault point of a power distribution network, which can judge a fault line in a three-phase line by collecting current cycle information of the three-phase line when a fault occurs, and calculate an accurate fault position on the fault line according to the current cycle information.
The application provides a method for detecting and positioning a fault point of a power distribution network, which comprises the following steps:
(1) Detecting the current amplitude;
If the current amplitude exceeds a preset threshold, a first fault reporting message is sent to an upper system and the detection time is sent to an associated detection device, wherein the first fault reporting message comprises the detection time, current cycle information and detection node position information, the detection node is a branch three-phase circuit detection node, and the associated detection device is a rest phase circuit detection device of the same detection node;
(2) Detecting whether the detection time is received;
If yes, sending second barrier information to an upper system, wherein the second barrier information comprises the position information of the detection node and the current cycle information corresponding to the detection time;
(3) Acquiring the first barrier information and the second barrier information, and acquiring the current cycle information of N detection nodes according to the detection time;
(4) And judging whether the ground fault occurs or not and calculating the fault distance according to the current cycle information and the detection time.
In one embodiment, the sending the first fault report information to the upper system if the current amplitude exceeds a preset threshold value further includes sending a time service request to a satellite immediately if the current amplitude exceeds the preset threshold value, and acquiring satellite time service as the detection time.
In one embodiment, the method further comprises the steps of collecting current traveling wave data before detecting the current amplitude and storing the current traveling wave data.
In one embodiment, the current cycle information records the current traveling wave data for the first 4 and last 8 cycles for the detection time.
In one embodiment, the detection node position information is satellite positioning information or detection node serial number information.
In one embodiment, the obtaining the current cycle information of the N detection nodes specifically includes determining a fault line according to the detection node position information of the first fault information, and obtaining the current cycle information of N detection nodes adjacent to the fault line.
In one embodiment, the judging whether the ground fault occurs according to the current cycle information and the detection time further comprises respectively synthesizing zero sequence currents of three-phase lines according to the current cycle information of the detection node, and determining whether the detection node has the fault line with the ground fault according to the zero sequence current phase difference of 180 degrees between the fault line and the non-fault line, wherein the zero sequence current of the fault line is equal to the sum of the zero sequence currents of the non-fault line.
In one embodiment, the determining the fault type and calculating the fault distance according to the current cycle information and the detection time specifically includes:
And calculating the grounding position of the fault line according to the time difference of the transient wave head of the zero sequence current reaching the detection device at the two ends of the branch line.
A second aspect of the present application provides a power distribution network fault point detection system, including:
the detection unit is used for detecting the current amplitude and collecting the current traveling wave data;
The processing unit is used for controlling the detection unit, the time service unit, the storage unit and the communication unit;
the time service unit is used for acquiring satellite time service time as the detection time;
The communication unit is used for sending information to the upper system and other detection nodes;
the storage unit is used for storing the current traveling wave data acquired by the detection unit;
The upper system is used for receiving the current cycle information and the detection time, synthesizing the three-phase zero sequence current of the detection node, judging whether the fault line exists in the detection node or not, and calculating the position of the fault point on the fault line.
The application provides a method for detecting and positioning a fault point of a power distribution network, by arranging current detection nodes at two ends of each branch line, each detection node comprises 3 detection devices for respectively detecting a three-phase circuit. The detection device monitors the current amplitude in the line in real time, when the current amplitude exceeds a preset threshold value, the detection device respectively sends information to an upper system and other phase detection devices of the same detection node, the upper system receives the current cycle information and the corresponding detection time and requests to a fault node and the detection node adjacent to the fault point to acquire the current cycle information corresponding to the detection time, and the upper system calculates the time of a zero sequence current transient wave in the fault line reaching the detection devices at two ends of the branch line through a double-end current traveling wave method, so that the accurate position of the fault point on the branch line is determined.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
Fig. 1 is a schematic flow chart of a method for detecting and locating a fault point of a power distribution network according to an embodiment of the present application;
Fig. 2 is an installation schematic diagram of a fault point detection system of a power distribution network according to an embodiment of the present application.
Detailed Description
Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
Fig. 1 is a schematic flow chart of a method for detecting and locating a fault point of a power distribution network according to an embodiment of the present application.
Referring to fig. 1, the method comprises the following steps:
S1, detecting a current amplitude;
if the current amplitude of the line exceeds a preset threshold, sending first fault reporting information to an upper system and sending the detection time to an associated detection device, wherein the first fault reporting information comprises the detection time, current cycle information and detection node position information;
In the embodiment of the application, the branch lines of the power distribution network are three-phase lines, and detection nodes are arranged at two ends of each branch line, and each detection node is provided with 3 detection devices for synchronously detecting the A-phase, B-phase and C-phase lines of the three-phase lines.
Further, if the current amplitude exceeds a preset threshold, a time service request is immediately sent to the satellite, and the satellite time service time is obtained as the detection time.
Further, the method further comprises the steps of collecting current traveling wave data before the current amplitude is detected, and storing the current traveling wave data.
Further, the current amplitude is the current amplitude acquired after passing through the filter and the amplifying circuit.
Further, a rogowski coil is adopted to collect the current traveling wave data.
Further, the data sampling frequency of the current traveling wave data is 12.8kHz, and the sampling bit width is 16bits.
Further, the current cycle information records the current traveling wave data of the first 4 and the last 8 periods for the detection time.
Further, the detection node position information is satellite positioning information or detection node serial number information.
In the embodiment of the application, when a fault of at least one phase line occurs, the detection device detects that the current amplitude of the fault line exceeds a preset threshold value, immediately acquires time service time through satellite time service, packages the time service time as the detection time into the first fault information, and packages current traveling wave data of the first 4 and the last 8 periods taking the detection time as a starting point into the first fault information as the current cycle information. The detection device acquires the position information of the detection node, packages the position information into the first barrier information, and then sends the first barrier information to an upper system, and the detection device sends the detection time to other phase detection devices of the detection node after sending the first barrier information.
S2, detecting whether the detection time is received or not;
If yes, sending second barrier reporting information to an upper system, wherein the second barrier reporting information comprises the position information of the detection node and the current cycle information corresponding to the detection time;
if not, continuing to detect;
In the embodiment of the application, in the same detection node, after the detection device on a non-fault line receives the detection time sent by the detection device on the fault line, the current traveling wave data of the first 4 and the last 8 periods of the detection time are taken as the current cycle information to be packed into the second barrier information, and meanwhile, the position information of the detection node is packed into the second barrier information and then the second barrier information is sent to an upper system.
S3, acquiring the first barrier information and the second barrier information, and acquiring the current cycle information of N detection nodes according to the detection time;
In the embodiment of the application, after the upper system receives the first fault information and the second fault information, the upper system extracts the detection time and the detection node position information, judges the branch line where the fault occurs, sends the detection time to at least 2 detection nodes at two ends of the detection node on which the detection node position information is acquired on the branch line, and acquires the current cycle information corresponding to the detection time sent by at least 2 detection nodes.
And S4, judging whether the ground fault occurs or not and calculating the fault distance according to the current cycle information and the detection time.
Further, according to the zero-sequence current phase difference of the fault line and the non-fault line being 180 degrees, and the zero-sequence current of the fault line being equal to the sum of the zero-sequence currents of the non-fault line, determining whether the fault line with the ground fault occurs at the detection node.
Further, the grounding position of the fault line is calculated according to the time difference that the transient wave head of the zero-sequence current reaches the detection device at the two ends of the branch line.
In the embodiment of the application, the current cycle information of the A phase, the B phase and the C phase of the same detection node is obtained, and the zero sequence current is synthesized. And determining a phase circuit with faults according to the zero sequence current phase difference of each phase and the zero sequence current of each phase on the three-phase line.
In the embodiment of the application, the zero-sequence current cycle information of the two detection nodes before and after the fault line is obtained, and the position of fault occurrence is calculated according to the time when the transient wave head of the zero-sequence current reaches the two detection nodes before and after the fault line.
In the embodiment of the application, the synchronous detection of the current traveling wave of the three-phase line is realized by arranging the detection devices on the three-phase line of the branch line, the detection devices can record the current traveling wave data for 3 hours, the detection devices of the same detection node are in communication connection, and the detection devices can also be in communication connection with an upper system. When a fault occurs, the detection device can detect the occurrence of the fault at the first time and request other phase detection devices of the same detection node to send the current cycle information corresponding to the detection time to an upper system, the upper system acquires the current cycle information, and a fault line and an accurate position of the fault point on the fault line are determined according to the current cycle information.
Example two
The application also provides a power distribution network fault point detection system based on the first embodiment, which comprises:
the detection unit is used for detecting the current amplitude and collecting the current traveling wave data;
The processing unit is used for controlling the detection unit, the time service unit, the storage unit and the communication unit;
the time service unit is used for acquiring satellite time service time as the detection time;
The communication unit is used for sending information to the upper system and other detection nodes;
the storage unit is used for storing the current traveling wave data acquired by the detection unit;
The upper system is used for receiving the current cycle information and the detection time, synthesizing the three-phase zero sequence current of the detection node, judging whether the fault line exists in the detection node or not, determining the fault line according to the current cycle information, and determining the accurate position of the fault point on the fault line.
In the embodiment of the application, the current amplitude is detected in real time by the detection unit, and the current traveling wave data is collected. When a fault occurs, the time service unit acquires satellite time service as the detection time, and the processing unit sends the current cycle information and the detection time in the storage unit to the upper system through the communication unit. And the upper system receives the current cycle information and the detection time, synthesizes the three-phase zero sequence current of the detection node, and determines a fault line and an accurate position of a fault point on the fault line according to the current cycle information.
In the embodiment of the application, the detection units are arranged at the detection nodes of each line, fig. 2 is an installation schematic diagram of a power distribution network fault point detection system provided in the embodiment of the application, as shown in fig. 2, a power distribution network line 110 and a line 210 are connected in parallel on a main line 10, the two ends of the line 210 are respectively provided with the detection nodes 211 and 212, the two ends of the line 110 are respectively provided with the detection nodes 111 and 112, the line 120 is connected between the detection nodes 111 and 112 of the line 110, and the two ends of the line 120 are also provided with the detection nodes 121 and 122. The trunk line 10 and branch lines connected with the trunk line 10 are three-phase lines, and the detection nodes comprise 3 groups of detection devices which are respectively used for detecting current amplitude values of the three-phase lines, collecting current traveling wave data and realizing communication functions among units.
The specific manner in which the respective modules perform the operations in the apparatus of the above embodiments has been described in detail in the embodiments related to the method, and will not be described in detail herein.
The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments. Those skilled in the art will also appreciate that the acts and modules referred to in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined and pruned according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided and pruned according to actual needs.
Furthermore, the method according to the application may also be implemented as a computer program or computer program product comprising computer program code instructions for performing part or all of the steps of the above-described method of the application.
Or the application may also be embodied as a non-transitory machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) having stored thereon executable code (or a computer program, or computer instruction code) that, when executed by a processor of an electronic device (or electronic device, server, etc.), causes the processor to perform some or all of the steps of a method according to the application as described above.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the application herein may be implemented as electronic hardware, computer software, or combinations of both.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. The method for detecting and positioning the fault point of the power distribution network is characterized by comprising the following steps of:
S1, detecting a current amplitude;
If the current amplitude exceeds a preset threshold, sending first fault reporting information to an upper system and sending detection time to an associated detection device, wherein the first fault reporting information comprises detection time, current cycle information and detection node position information, and the detection node is a branch three-phase circuit detection node;
if not, continuing to detect;
S2, detecting whether the detection time is received or not;
If yes, sending second barrier reporting information to an upper system, wherein the second barrier reporting information comprises the position information of the detection node and the current cycle information corresponding to the detection time;
if not, continuing to detect;
S3, acquiring the first barrier information and the second barrier information, and acquiring the current cycle information of N detection nodes according to the detection time, wherein N is an integer greater than zero;
And S4, judging whether the ground fault occurs or not and calculating the fault distance according to the current cycle information and the detection time.
2. The method for detecting and locating a fault point of a power distribution network according to claim 1, wherein if the current amplitude exceeds a preset threshold, sending the first fault report information to the upper system further comprises:
If the current amplitude exceeds the preset threshold, immediately sending a time service request to the satellite, and acquiring satellite time service time as the detection time.
3. The method for detecting and locating a fault point of a power distribution network according to claim 1, wherein said detecting the current amplitude is preceded by:
and collecting current traveling wave data and storing the current traveling wave data.
4. A method of detecting and locating a fault point of a power distribution network as claimed in claim 3, wherein said current cycle information records said current traveling wave data for the first 4 and last 8 cycles for said detection time.
5. The method for detecting and locating a fault point of a power distribution network according to claim 1, wherein the location information of the detection node is satellite location information or detection node serial number information.
6. The method for detecting and locating a fault point of a power distribution network according to claim 1, wherein the step of obtaining the current cycle information of the N detection nodes specifically includes:
And determining a fault line according to the position information of the detection nodes of the first fault reporting information, and acquiring the current cycle information of N detection nodes adjacent to the fault line.
7. The method for detecting and locating a fault point of a power distribution network according to claim 1, wherein said determining whether a ground fault occurs according to the current cycle information and the detection time further comprises:
Respectively synthesizing zero sequence currents of the three-phase lines according to the current cycle information of the detection node;
and determining whether the fault line with the ground fault exists in the detection node according to the zero sequence current phase difference of 180 degrees between the fault line and the non-fault line and the zero sequence current of the fault line being equal to the sum of the zero sequence currents of the non-fault line.
8. The method for detecting and locating a fault point of a power distribution network according to claim 7, wherein the judging the fault type and calculating the fault distance according to the current cycle information and the detection time specifically comprises:
And calculating the grounding position of the fault line according to the time difference of the transient wave head of the zero sequence current reaching the detection device at the two ends of the branch line.
9. A power distribution network fault point detection system, based on the power distribution network fault point detection and positioning method according to any one of claims 1-8, comprising:
the detection unit is used for detecting the current amplitude and collecting the current traveling wave data;
the time service unit is used for acquiring satellite time service time as the detection time;
The communication unit is used for sending information to the upper system and other detection nodes;
the storage unit is used for storing the current traveling wave data acquired by the detection unit;
The processing unit is used for controlling the detection unit, the time service unit, the storage unit and the communication unit;
And the upper system is used for receiving the current cycle information and the detection time, synthesizing the three-phase zero sequence current of the detection node, judging whether a fault line exists in the detection node or not, and calculating the position of the fault point on the fault line.
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| CN111257700A (en) * | 2020-03-31 | 2020-06-09 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network single-phase earth fault positioning device and method based on edge calculation |
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| CN104155582B (en) * | 2014-08-29 | 2016-10-19 | 上海交通大学 | Fault section location method of distribution network based on full waveform information |
| CN109061396A (en) * | 2018-10-10 | 2018-12-21 | 国网江苏省电力有限公司无锡供电分公司 | A kind of power distribution network traveling wave fault positioning method, apparatus and system |
| CN109470994A (en) * | 2018-11-09 | 2019-03-15 | 南京大贺电力科技有限公司 | Faulty line judgement system and method for power distribution network |
| CN111736038A (en) * | 2020-08-18 | 2020-10-02 | 广东冠能电力科技发展有限公司 | Edge calculating device for power distribution network fault positioning and power distribution network fault positioning system |
| CN112363008A (en) * | 2020-09-17 | 2021-02-12 | 广州长川科技有限公司 | Cable fault and running state comprehensive monitoring method and system |
| CN112578224A (en) * | 2020-12-07 | 2021-03-30 | 广西电网有限责任公司电力科学研究院 | Method and system for processing and positioning faults of power distribution network |
| CN113030635A (en) * | 2021-02-07 | 2021-06-25 | 广州长川科技有限公司 | Non-contact type traveling wave fault location method and device |
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