CN111579926A - Distributed power fault positioning method for power distribution network - Google Patents
Distributed power fault positioning method for power distribution network Download PDFInfo
- Publication number
- CN111579926A CN111579926A CN202010439123.0A CN202010439123A CN111579926A CN 111579926 A CN111579926 A CN 111579926A CN 202010439123 A CN202010439123 A CN 202010439123A CN 111579926 A CN111579926 A CN 111579926A
- Authority
- CN
- China
- Prior art keywords
- fault
- power
- distributed
- distribution network
- power distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- G01R31/088—Aspects of digital computing
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention relates to a distributed power fault positioning method for a power distribution network, and belongs to the field of power distribution network fault detection. The method comprises the following steps: synchronous data acquisition of the distributed fault indicators is realized by utilizing a sensing node wide area synchronization technology; the clustering method is adopted to realize power failure positioning; distributed fault indicator comprehensive energy-taking technology. The invention can realize the synchronous acquisition of three-phase current signals of the line, adopts a clustering method to realize the extraction of transient state characteristics of faults, accurately judges fault points, effectively improves the automation level of real-time fault detection of the power transmission and distribution line, provides powerful guarantee for quickly removing line faults and is convenient to apply to an actual power system. The method has the advantages of being scientific and reasonable, strong in applicability, high in reliability and good in effect.
Description
Technical Field
The invention relates to the field of power distribution network fault detection, in particular to a distributed power fault positioning method for a power distribution network.
Background
The power distribution network is positioned at the tail end of the whole power network and is directly connected with the power load, and the reliable power supply capacity of the power distribution network is the direct reflection of the economic benefits of power enterprises. When the power distribution network fails, if the fault position can be quickly positioned, the fault area can be isolated in time, and the power supply of a non-fault area can be quickly recovered, so that the power failure range and time can be reduced, and the loss is effectively reduced. However, as the coverage of the power distribution network is continuously enlarged and new distributed energy resources are continuously added into the power distribution network, the network structure of the power distribution network is increasingly complex, and fault judgment is more difficult.
Considering the continuous change of the self structure and the operation characteristics of the power distribution network, the development of the rapid judgment and the positioning of the power distribution network faults is a new problem worthy of long-term research. Therefore, in order to locate the fault in the shortest time, repair the fault in time, improve the power supply reliability, save manpower, material resources and time, the development of an economic, convenient and reliable power distribution network power fault location system suitable for a production field is urgent.
Disclosure of Invention
The invention aims to provide a distributed power fault positioning method for a power distribution network, and solves the problems of low power fault positioning speed, large judgment error and the like of the power distribution network in the prior art. The method and the device can realize quick judgment and positioning of the power line fault of the power distribution network, and are convenient to apply to an actual power system.
The above object of the present invention is achieved by the following technical solutions:
the distributed power fault positioning method for the power distribution network comprises the following steps:
step 1, synchronous data acquisition of a distributed fault indicator is realized by utilizing a sensing node wide area synchronization technology;
step 2, realizing power failure positioning by adopting a clustering method;
and step 3, comprehensive energy obtaining technology of the distributed fault indicators.
The method comprises the following steps that 1, synchronous data acquisition of the distributed fault indicator is realized by utilizing a sensing node wide area synchronization technology, namely, the data acquisition is realized through a wireless sensor, a traveling wave synchronization method is adopted, when a power line fails, a fault point can generate traveling wave signals which are transmitted to two ends of the line, and synchronous triggering of the device is realized by utilizing a traveling wave principle.
The step 2 of adopting the clustering method to realize the power failure positioning comprises the following steps: and extracting fault transient characteristics by adopting a clustering method, carrying out clustering analysis on the original data matrix, dividing the measuring points into a fault class and a non-fault class, and positioning the fault position through the topological structure of the actual power grid.
The distributed fault indicator comprehensive energy obtaining technology in the step 3 is that a current transformer is installed on a distribution line branch, a secondary winding used for supplying power is added, the current transformer is provided with two secondary windings, one secondary winding is used for measuring current, the other secondary winding is used for inducing alternating voltage, then direct current voltage is output after rectification, filtering and voltage stabilization, and a power supply can reliably supply power while reliable insulation can be guaranteed; meanwhile, in order to ensure reliable power supply of the fault indicator, the solar cell panel is adopted for power supply to comprehensively obtain energy.
The fault indicator comprises a fault signal acquisition and indication module, and the fault signal acquisition and indication module comprises a power supply module, an electric quantity acquisition module and a control module; the electric quantity acquisition module is a current transformer, acquires three-phase current, and sends the three-phase current to a control chip of the single chip microcomputer through the signal processing unit; the power module is an electromagnetic induction electricity taking and solar energy electricity taking comprehensive power supply unit.
The invention has the beneficial effects that: the power distribution network power failure indicator positioning technology has the advantages that synchronous acquisition of three-phase current signals of a line can be realized, the extraction of transient state characteristics of faults is realized by adopting a clustering method, fault points are accurately judged, the automation level of real-time fault detection of power transmission and distribution lines is effectively improved, powerful guarantee is provided for quickly removing line faults, the power distribution network power failure indicator positioning technology is convenient to apply in an actual power system, and the power distribution network power failure indicator positioning technology is scientific and reasonable, high in applicability, high in reliability and good in effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a fault location model of cluster analysis;
fig. 2 is a hardware portion of the fault signal acquisition and indication module.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the method for locating a distributed power fault of a power distribution network of the present invention includes the following steps:
step 1: and synchronous data acquisition of the distributed fault indicator is realized by utilizing a sensing node wide area synchronization technology.
Step 2: and (4) realizing power failure positioning by adopting a clustering method.
And step 3: distributed fault indicator comprehensive energy-taking technology.
In the step 1, data acquisition of the distributed fault indicator is realized through a wireless sensor, and for the sensors on the same feeder line, acquisition and phasor comparison of zero-sequence current are required to be performed under the same time measurement. For a 10kV distribution line, the distribution line is generally between several kilometers and dozens of kilometers, the installation of the sensors is relatively dispersed, and the distances between the sensors are relatively far. These constraints require that the sensing nodes adopt a certain technical means to realize synchronous operation and accurate timing.
The invention adopts a traveling wave synchronization method, when a power line has a fault, a fault point can generate traveling wave signals which are transmitted to two ends of the line, and the synchronization trigger device is realized by utilizing the traveling wave principle. Under the scheme, each wireless sensor measuring point of the section positioning system is in a dormant state under normal conditions, and only when a fault occurs, the wireless sensor measuring point captures a traveling wave signal through the traveling wave sensor, the wireless sensor measuring point finishes dormancy and starts to acquire data information. The precision of the travelling wave synchronization is mainly influenced by the distance between a fault point and a measuring point, and when the power line transmits electric energy, the electric energy is transmitted in the form of electromagnetic waves, and the speed of the travelling wave on the overhead line is close to the light speed, so the travelling wave synchronization has better precision in a short distance range.
In the step 2, when the power distribution network has a fault, the fault steady-state information has long duration, and multiple continuous line selection comprehensive judgments can be carried out through the fault steady-state information to ensure the accuracy of line selection. However, the fault stability information is susceptible to the neutral grounding scheme, line length, and transition resistance. In addition, the fault steady-state information amplitude is small and is easily influenced by the measurement error and noise of the mutual inductor, so that the accuracy of line selection is reduced. On the other hand, in the transient process, the fault transient information has obvious characteristics and high sensitivity, and is not influenced by a neutral point wiring mode, but the fault transient information has short duration, so that the wide use of line selection is limited. Therefore, the fault locating method comprehensively utilizes the steady-state information and the transient-state information of the fault of each measuring point and carries out fault locating through various fault characteristics is an effective method.
Clustering is a common data analysis tool, and simply speaking, clustering is the process of converting a set of physical or abstract objects into multiple classes or clusters composed of similar objects. At present, the common clustering methods mainly include a partition method, a hierarchy method, a density-based method, a grid-based method and a model-based method.
The class generated by the clustering is a collection of objects, with objects in the class similar to objects in the same class and dissimilar to objects in other classes. In many applications, data objects in a class may be treated as a whole. The completion of the clustering task can be generally divided into basic steps of feature selection, neighbor measurement, clustering criteria, clustering algorithm, verification result, result judgment and the like.
In the step 3, in order to solve the problem that the fault indicator does not use a line or a battery for power supply and achieve the purpose of later maintenance-free, a current transformer is installed on a distribution line branch, and a secondary winding used for power supply is added, the winding has large capacity but low precision, so that the current transformer is provided with two secondary windings, one secondary winding is used for measuring current, the other secondary winding is used for inducing alternating voltage, and then the alternating voltage is rectified, filtered and stabilized to output direct voltage, and the power supply can reliably supply power and can also ensure reliable insulation; meanwhile, in order to ensure reliable power supply of the fault indicator, the invention also adopts the solar cell panel to supply power to comprehensively obtain energy. No matter the current transformer is used for taking energy from the solar panel, a large capacitor must be arranged in the measuring device, so that the measuring device is prevented from stopping running when the line is powered off or the illumination is insufficient.
The fault indicator comprises a fault signal acquisition and indication module, wherein the fault signal acquisition and indication module comprises: the device comprises a power supply module, an electric quantity acquisition module and a control module. Designing a current collecting device and a fault diagnosis method according to the step 2, so that a method for synchronously collecting and detecting data of the separated three-phase fault indicator can be achieved, and the accurate detection of various types of faults is realized; designing a power supply unit of the monitoring acquisition terminal according to the step 3, namely an electromagnetic induction power-taking and solar power-taking comprehensive power supply unit for the fault indicator, solving the problem that an induction energy-taking device is powered by a battery, and enabling the induction energy-taking device to be maintenance-free; electromagnetic induction electricity taking and solar energy electricity taking are adopted to supply power in parallel, and uninterrupted power supply work of the acquisition device is guaranteed.
Referring to fig. 1, a fault location model of cluster analysis is shown. The strict mathematical description of clustering is: assuming the sample set of the study is E, the class C is defined as a non-empty subset of E, i.e. satisfies:
clustering is a set of classes C1, C2, …, Ck that satisfy the following conditions.
C1YC2∩YCK＝E (2)
As can be seen from equation (2), any sample in the sample set E necessarily belongs to a certain class; as can be seen from equation (3), any sample in the sample set E belongs to only one class at most. The basic steps of clustering can be roughly divided into: feature selection, neighbor measure, clustering criterion, clustering algorithm, verification result and result judgment.
The main thought of the fault positioning method based on cluster analysis is as follows: and (4) additionally arranging a sensing measuring device on each branch of the feeder line, thereby constructing a wide area measuring system of the power distribution network. When the system has single-phase earth faults, the measuring device takes the sudden change of zero sequence voltage as a starting criterion and sends a starting signal to the background, so that the background starts to receive voltage and current signals before and after the faults of each measuring device, and the voltage and current signals are used as data samples for cluster analysis. And simultaneously extracting each fault characteristic quantity (comprising fault steady-state characteristic components and fault transient characteristic components) by utilizing a plurality of signal processing methods. Thus, an original data matrix X of n measuring points is obtained, each measuring point has m indexes to represent the fault information, namely:
and performing cluster analysis on the original data matrix X, so as to divide the measuring points into a fault class and a non-fault class, and positioning the fault position through the topological structure of the actual power grid.
Referring to fig. 2, the hardware part of the fault signal collecting and indicating module includes: the device comprises a power supply module, an electric quantity acquisition module and a control module. The power supply module: by adopting a comprehensive energy taking technology, double power supplies are used for supplying power, and a current transformer used by a main power supply is used for taking power, so that the power supply can ensure reliable insulation while measuring and reliably supplying power, and a power supply mode of a solar cell panel is used as a second power supply for preventing the power supply interruption of a measuring device caused by the damage of the current transformer or the power failure of a line.
An electrical parameter acquisition module: the current transformer is used for collecting electric parameters, mainly collecting phase currents of all signal nodes at the same moment, and sending the phase currents to the control chip through the signal processing unit.
A control module: the core of the acquisition system is to use a singlechip with the characteristic of low power consumption, and the whole system follows the principle of low power consumption.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.
Claims (5)
1. A distributed power fault positioning method for a power distribution network is characterized by comprising the following steps: the method comprises the following steps:
step 1, synchronous data acquisition of a distributed fault indicator is realized by utilizing a sensing node wide area synchronization technology;
step 2, realizing power failure positioning by adopting a clustering method;
and step 3, comprehensive energy obtaining technology of the distributed fault indicators.
2. The distributed power failure location method of the power distribution network of claim 1, wherein: the method comprises the following steps that 1, synchronous data acquisition of the distributed fault indicator is realized by utilizing a sensing node wide area synchronization technology, namely, the data acquisition is realized through a wireless sensor, a traveling wave synchronization method is adopted, when a power line fails, a fault point can generate traveling wave signals which are transmitted to two ends of the line, and synchronous triggering of the device is realized by utilizing a traveling wave principle.
3. The distributed power failure location method of the power distribution network of claim 1, wherein: the step 2 of adopting the clustering method to realize the power failure positioning comprises the following steps: and extracting fault transient characteristics by adopting a clustering method, carrying out clustering analysis on the original data matrix, dividing the measuring points into a fault class and a non-fault class, and positioning the fault position through the topological structure of the actual power grid.
4. The distributed power failure location method of the power distribution network of claim 1, wherein: the distributed fault indicator comprehensive energy obtaining technology in the step 3 is that a current transformer is installed on a distribution line branch, a secondary winding used for supplying power is added, the current transformer is provided with two secondary windings, one secondary winding is used for measuring current, the other secondary winding is used for inducing alternating voltage, then direct current voltage is output after rectification, filtering and voltage stabilization, and a power supply can reliably supply power while reliable insulation can be guaranteed; meanwhile, in order to ensure reliable power supply of the fault indicator, the solar cell panel is adopted for power supply to comprehensively obtain energy.
5. The distributed power failure location method of the power distribution network of claim 1, wherein: the fault indicator comprises a fault signal acquisition and indication module, and the fault signal acquisition and indication module comprises a power supply module, an electric quantity acquisition module and a control module; the electric quantity acquisition module is a current transformer, acquires three-phase current, and sends the three-phase current to a control chip of the single chip microcomputer through the signal processing unit; the power module is an electromagnetic induction electricity taking and solar energy electricity taking comprehensive power supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010439123.0A CN111579926A (en) | 2020-05-22 | 2020-05-22 | Distributed power fault positioning method for power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010439123.0A CN111579926A (en) | 2020-05-22 | 2020-05-22 | Distributed power fault positioning method for power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111579926A true CN111579926A (en) | 2020-08-25 |
Family
ID=72114005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010439123.0A Pending CN111579926A (en) | 2020-05-22 | 2020-05-22 | Distributed power fault positioning method for power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111579926A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505481A (en) * | 2020-11-20 | 2021-03-16 | 云南电网有限责任公司普洱供电局 | 35kV power line fault traveling wave extraction method based on neighbor propagation clustering |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203772931U (en) * | 2014-01-03 | 2014-08-13 | 广东电网公司电力科学研究院 | Online power distribution network fault wave recording device based on wireless three-phase synchronous technology |
| CN104931859A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | Fault monitoring device based on distributed wave recording |
| CN205539179U (en) * | 2016-04-28 | 2016-08-31 | 四川瑞霆电力科技有限公司 | Built on stilts distribution lines zero sequence current acquisition terminal based on clock synchronization technique |
| CN106646122A (en) * | 2016-12-07 | 2017-05-10 | 南京万形电气有限公司 | Line distribution monitoring system based on wireless transmission and synchronization sampling method |
| CN207114694U (en) * | 2017-08-21 | 2018-03-16 | 光一科技股份有限公司 | The current break triggers circuit of fault detector and its collecting unit |
-
2020
- 2020-05-22 CN CN202010439123.0A patent/CN111579926A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203772931U (en) * | 2014-01-03 | 2014-08-13 | 广东电网公司电力科学研究院 | Online power distribution network fault wave recording device based on wireless three-phase synchronous technology |
| CN104931859A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | Fault monitoring device based on distributed wave recording |
| CN205539179U (en) * | 2016-04-28 | 2016-08-31 | 四川瑞霆电力科技有限公司 | Built on stilts distribution lines zero sequence current acquisition terminal based on clock synchronization technique |
| CN106646122A (en) * | 2016-12-07 | 2017-05-10 | 南京万形电气有限公司 | Line distribution monitoring system based on wireless transmission and synchronization sampling method |
| CN207114694U (en) * | 2017-08-21 | 2018-03-16 | 光一科技股份有限公司 | The current break triggers circuit of fault detector and its collecting unit |
Non-Patent Citations (2)
| Title |
|---|
| 吴骏等: "基于物联网技术的配电网故障定位研究", 《高压电器》 * |
| 苗世洪等: "基于无线传感器网络的配电线路故障定位方案", 《电力***自动化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505481A (en) * | 2020-11-20 | 2021-03-16 | 云南电网有限责任公司普洱供电局 | 35kV power line fault traveling wave extraction method based on neighbor propagation clustering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102590700B (en) | Based on pole line fast fault locating method and the device of time synchronized | |
| CN202177681U (en) | System for positioning fault of DC transmission line | |
| CN109061541A (en) | A kind of low-voltage platform area electric topology identification system and its working method | |
| CN108828404A (en) | Low-voltage platform area electric topology identification system and method for fast failure positioning | |
| EP2985613A1 (en) | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| CN110988600B (en) | Power distribution network line break fault section positioning method | |
| CN106771870A (en) | A kind of distribution net work earthing fault localization method and system | |
| CN102540017B (en) | Partition and segmentation on-line positioning method for small-current grounding faults | |
| CN102636731A (en) | Power distribution network single-phase disconnection judging and addressing method based on load measuring and recording system | |
| CN103592566A (en) | Wireless communication based power distribution network distributed online monitoring and fault positioning system | |
| CN104297643A (en) | Electric power circuit insulation fault early warning device | |
| CN114460411A (en) | Fault positioning method, device and system for power transmission network, processor and electronic equipment | |
| CN201993432U (en) | Power transmission line single-end traveling wave fault distance measuring device based on traveling wave and power frequency amount principle | |
| CN110632459A (en) | Power distribution network fault section positioning method based on synchronous phasor measurement | |
| CN110907752A (en) | Method for acquiring transient initial point of zero-sequence current in single-phase earth fault of power distribution network | |
| CN102081133A (en) | Intelligent transformer and equipment for detecting high voltage line | |
| CN202600092U (en) | On-line positioning system for small current grounding fault section | |
| CN107219443B (en) | Transient wave recording indicator | |
| CN103674291A (en) | Temperature monitoring system of all-insulated bus | |
| CN205317885U (en) | Distributing type transmission line fault location system | |
| CN102590695A (en) | Device for detecting and locating failure of power line | |
| CN205539316U (en) | Distribution network mixes trouble range unit based on PMU | |
| CN111579926A (en) | Distributed power fault positioning method for power distribution network | |
| CN113219302A (en) | Full-parameter online monitoring and fault identification system for distribution line | |
| CN202433480U (en) | Fast fault location device of overhead lines based on time synchronization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200825 |