CN116298682A - Power distribution network fault positioning system and method - Google Patents
Power distribution network fault positioning system and method Download PDFInfo
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- CN116298682A CN116298682A CN202310218107.2A CN202310218107A CN116298682A CN 116298682 A CN116298682 A CN 116298682A CN 202310218107 A CN202310218107 A CN 202310218107A CN 116298682 A CN116298682 A CN 116298682A
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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
- G01R31/088—Aspects of digital computing
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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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- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a power distribution network fault positioning system and a method, comprising the following steps: the voltage and current information generated in the fault loop after the fault is utilized to perform certain calculation to finally deduce the total impedance of the loop; when the fault accurate positioning of the power distribution network is carried out, the fault accurate positioning of the power distribution network is finally successfully realized, a large number of fault indicators which are low in cost and low in operation cost are firstly used in the power distribution network, the fault section positioning can be well realized by being matched with the use of the FTU because the principle of the fault indicator is reliable, the fault accurate positioning is realized by only utilizing the data of the measuring points under the support of the automatic technology of the power system, the change of the electric quantity in the power system before and after the fault recorded by the FTU is fully utilized, the symmetrical component method is used for analyzing the fault accurate positioning, and the accurate fault distance formula based on the section positioning is deduced according to the related principle of the impedance method.
Description
Technical Field
The invention belongs to the technical field of power distribution network fault positioning, and particularly relates to a power distribution network fault positioning system and method.
Background
The distribution network refers to a power network that receives electric energy from a power transmission network or a regional power plant, and distributes the electric energy locally or step by step according to voltage through a distribution facility. The system consists of overhead lines, cables, towers, distribution transformers, isolating switches, reactive compensators, a plurality of auxiliary facilities and the like, and plays a role in distributing electric energy in a power network.
At present, the following problems exist in fault location of a power distribution network:
(1) The existing power distribution network has a complex structure, the number of measurement points is limited, and fault location is accurately performed by utilizing information of limited faults under the condition of limited measurement points;
(2) The current power distribution network has low automation level, can not obtain enough fault information in the actual power distribution network, and can accurately position the faults of the power distribution network under the condition that the fault information is limited;
(3) The power distribution network faces to complex and diverse users, load currents of the power distribution network have great influence on fault location due to different load conditions, and accurate fault location is performed on the power distribution network under various load currents.
Disclosure of Invention
The invention aims to overcome the defects that the prior power distribution network has a complex structure and limited number of measuring points, and how to accurately locate faults by utilizing the information of limited faults under the condition of limited measuring points; the current power distribution network has low automation level, can not obtain enough fault information in the actual power distribution network, and can accurately position the faults of the power distribution network under the condition that the fault information is limited; the power distribution network is oriented to complicated and various users, load currents of the power distribution network have different load conditions, the fault location is greatly influenced, and the problem of how to accurately locate faults of the power distribution network under various load currents is solved.
In order to achieve the above purpose, the present invention provides the following technical solutions: a power distribution network fault positioning system and method comprises the following steps:
step one: the total impedance of the loop is finally deduced by certain calculation according to the voltage and current information generated in the fault loop after the fault, and the fault distance measurement can be realized by dividing the loop impedance value by the unit impedance length of the line;
step two: according to the number of measuring terminals, the method is roughly divided into a single-end ranging method and a double-end ranging method;
step three: compared with a single-end ranging method, the double-end ranging method is not affected by factors such as system impedance, fault resistance and the like, the ranging result accuracy is high, but the double-end ranging method is difficult to realize when being used for a power distribution network line, and the economy is inapplicable;
step four: the method has the advantages that the interphase short-circuit fault is accurately positioned, the impedance method still has good applicability, and the current complicated and various actual conditions of the power distribution network are considered;
step five: the positioning method based on the sectional switch and the recloser has great advantages of low cost, can be particularly suitable for underdeveloped economy, especially remote villages, and has simple structure and high reliability without specially setting up an information channel;
step six: the power distribution network has a complex structure, the topology analysis is effectively performed to solve the problem of fault positioning, the matrix method fully utilizes the topology characteristics of the power distribution network, and a description matrix is generated for the power distribution network by means of theoretical knowledge related to graph theory, so that the description matrix can accurately describe the characteristics of the power distribution network;
step seven: considering the wide use of the FTU in the power distribution network, the FTU records a large amount of electrical quantity which changes in the system when faults occur, the electrical quantity is fully utilized to accurately measure the faults, and the accurate positioning of the faults can be realized through the analysis of an impedance method.
Preferably, in the second step, the single-end distance measurement method is to complete the distance calculation of the fault point by using only the data of the single-end electric measurement of the power transmission line, and the method is simple to implement without considering information synchronization, but has larger error between the measured distance and the actual distance.
Preferably, in the third step, in the accurate fault location in the power transmission network, the double-end method is often used for fault location, but the power distribution network is different from a simple structure of the power transmission network, a plurality of problems are to be solved when the double-end method is used for fault location, the cost is high, the fault location accuracy of the power distribution network is easily influenced by line parameters, the research is carried out on a single-side power distribution network, a fault location method using double-end impedance is analyzed, the method is not limited by clock synchronization, the method is proposed on the basis of fully analyzing a fault location information platform, and a single-phase earth fault location equation set of a group of power distribution network lines without branches is arranged on the basis of using the information platform in the multi-branch power distribution network.
Preferably, in step three, the method requires only two steps, the first step: setting a sine signal with proper frequency at the initial end of the line and a detection resistor; and a second step of: after the system reaches a steady state, the conditions of the starting end and the tail end of the line and some necessary electric quantity are measured, so that positive sequence components can be obtained by analyzing all types of faults according to a symmetrical component method, and a fault ranging equation is further derived by the characteristics of the positive sequence components.
Preferably, in step six, at the same time, the FTU uploads the fault related information to the master station to regenerate a fault information matrix, and the fault location can be located through analysis and calculation of the matrix.
Compared with the prior art, the invention provides a power distribution network fault positioning system and method, which have the following beneficial effects:
when the fault accurate positioning of the power distribution network is carried out, the fault accurate positioning of the power distribution network is finally successfully realized, a large number of fault indicators which are low in cost and low in operation cost are firstly used in the power distribution network, the fault section positioning can be well realized by being matched with the use of the FTU because the principle of the fault indicator is reliable, the fault accurate positioning is realized by only utilizing the data of the measuring points under the support of the automatic technology of the power system, the change of the electric quantity in the power system before and after the fault recorded by the FTU is fully utilized, the symmetrical component method is used for analyzing the fault accurate positioning, and the accurate fault distance formula based on the section positioning is deduced according to the related principle of the impedance method.
The device has the advantages of scientific and reasonable structure, safe and convenient use and great help for people.
Detailed Description
It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention provides a technical scheme that: a power distribution network fault positioning system and method comprises the following steps:
step one: the total impedance of the loop is finally deduced by certain calculation according to the voltage and current information generated in the fault loop after the fault, and the fault distance measurement can be realized by dividing the loop impedance value by the unit impedance length of the line;
step two: according to the number of measuring terminals, the method is roughly divided into a single-end ranging method and a double-end ranging method;
step three: compared with a single-end ranging method, the double-end ranging method is not affected by factors such as system impedance, fault resistance and the like, the ranging result accuracy is high, but the double-end ranging method is difficult to realize when being used for a power distribution network line, and the economy is inapplicable;
step four: the method has the advantages that the interphase short-circuit fault is accurately positioned, the impedance method still has good applicability, and the current complicated and various actual conditions of the power distribution network are considered;
step five: the positioning method based on the sectional switch and the recloser has great advantages of low cost, can be particularly suitable for underdeveloped economy, especially remote villages, and has simple structure and high reliability without specially setting up an information channel;
step six: the power distribution network has a complex structure, the topology analysis is effectively performed to solve the problem of fault positioning, the matrix method fully utilizes the topology characteristics of the power distribution network, and a description matrix is generated for the power distribution network by means of theoretical knowledge related to graph theory, so that the description matrix can accurately describe the characteristics of the power distribution network;
step seven: considering the wide use of the FTU in the power distribution network, the FTU records a large amount of electrical quantity which changes in the system when faults occur, the electrical quantity is fully utilized to accurately measure the faults, and the accurate positioning of the faults can be realized through the analysis of an impedance method.
In the second step, preferably, the single-end distance measurement method is to complete the distance calculation of the fault point by using only the data of the single-end electric measurement of the power transmission line, and the method is simple to realize without considering information synchronization, but has larger error between the measured distance and the actual distance.
In the third step, preferably, in the accurate fault location in the power transmission network, the double-end method is often used for fault location, but the power distribution network is different from a simple structure of the power transmission network, a plurality of problems are to be solved when the double-end method is used for fault location, the cost is high, the fault location accuracy of the power distribution network is easily influenced by line parameters, a fault distance measurement method using double-end impedance is analyzed for a single-side power distribution network, the method is not limited by clock synchronization, the method is proposed on the basis of fully analyzing a fault location information platform, and a single-phase grounding fault distance measurement equation set of a group of power distribution network lines without branches is arranged on the basis of using the information platform in the multi-branch power distribution network.
In the present invention, preferably, in the third step, the method requires only two steps, the first step: setting a sine signal with proper frequency at the initial end of the line and a detection resistor; and a second step of: after the system reaches a steady state, the conditions of the starting end and the tail end of the line and some necessary electric quantity are measured, so that positive sequence components can be obtained by analyzing all types of faults according to a symmetrical component method, and a fault ranging equation is further derived by the characteristics of the positive sequence components.
In the present invention, preferably, in step six, at the same time, the FTU uploads the fault related information to the master station, and generates a fault information matrix, and the fault location can be located by analyzing and calculating the matrix.
When the fault accurate positioning of the power distribution network is carried out, the fault accurate positioning of the power distribution network is finally successfully realized, a large number of fault indicators which are low in cost and low in operation cost are firstly used in the power distribution network, the fault section positioning can be well realized by being matched with the use of the FTU because the principle of the fault indicator is reliable, the fault accurate positioning is realized by only utilizing the data of the measuring points under the support of the automatic technology of the power system, the change of the electric quantity in the power system before and after the fault recorded by the FTU is fully utilized, the symmetrical component method is used for analyzing the fault accurate positioning, and the accurate fault distance formula based on the section positioning is deduced according to the related principle of the impedance method.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (5)
1. A power distribution network fault positioning system and method are characterized in that: the method comprises the following steps:
step one: the total impedance of the loop is finally deduced by certain calculation according to the voltage and current information generated in the fault loop after the fault, and the fault distance measurement can be realized by dividing the loop impedance value by the unit impedance length of the line;
step two: according to the number of measuring terminals, the method is roughly divided into a single-end ranging method and a double-end ranging method;
step three: compared with a single-end ranging method, the double-end ranging method is not affected by factors such as system impedance, fault resistance and the like, the ranging result accuracy is high, but the double-end ranging method is difficult to realize when being used for a power distribution network line, and the economy is inapplicable;
step four: the method has the advantages that the interphase short-circuit fault is accurately positioned, the impedance method still has good applicability, and the current complicated and various actual conditions of the power distribution network are considered;
step five: the positioning method based on the sectional switch and the recloser has great advantages of low cost, can be particularly suitable for underdeveloped economy, especially remote villages, and has simple structure and high reliability without specially setting up an information channel;
step six: the power distribution network has a complex structure, the topology analysis is effectively performed to solve the problem of fault positioning, the matrix method fully utilizes the topology characteristics of the power distribution network, and a description matrix is generated for the power distribution network by means of theoretical knowledge related to graph theory, so that the description matrix can accurately describe the characteristics of the power distribution network;
step seven: considering the wide use of the FTU in the power distribution network, the FTU records a large amount of electrical quantity which changes in the system when faults occur, the electrical quantity is fully utilized to accurately measure the faults, and the accurate positioning of the faults can be realized through the analysis of an impedance method.
2. The power distribution network fault location system and method as claimed in claim 1, wherein: in the second step, the single-end distance measurement method is to complete the distance calculation of the fault point by using only the data of single-end electric measurement of the power transmission line, and the method is simple to realize without considering information synchronization, but has larger error between the measured distance and the actual distance.
3. The power distribution network fault location system and method as claimed in claim 1, wherein: in the third step, in the accurate fault location in the power transmission network, the double-end method is often utilized to perform fault location, but the power distribution network is different from a simple structure of the power transmission network, a plurality of problems are to be solved when the double-end method is used for fault location, the cost is high, the fault location accuracy of the power distribution network is easily affected by line parameters, a single-side power distribution network is researched, a fault distance measurement method utilizing double-end impedance is analyzed, the method is not limited by clock synchronization, the method is proposed on the basis of fully analyzing a fault location information platform, and a single-phase earth fault distance measurement equation set of a group of power distribution network lines without branches is arranged on the basis of utilizing the information platform in the multi-branch power distribution network.
4. The power distribution network fault location system and method as claimed in claim 1, wherein: in step three, the method requires only two steps, the first: setting a sine signal with proper frequency at the initial end of the line and a detection resistor; and a second step of: after the system reaches a steady state, the conditions of the starting end and the tail end of the line and some necessary electric quantity are measured, so that positive sequence components can be obtained by analyzing all types of faults according to a symmetrical component method, and a fault ranging equation is further derived by the characteristics of the positive sequence components.
5. The power distribution network fault location system and method as claimed in claim 1, wherein: in the sixth step, the relevant fault information is uploaded to the master station at the same time, a fault information matrix is generated, and the fault position can be located through analysis and calculation of the matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310218107.2A CN116298682A (en) | 2023-03-08 | 2023-03-08 | Power distribution network fault positioning system and method |
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| CN202310218107.2A CN116298682A (en) | 2023-03-08 | 2023-03-08 | Power distribution network fault positioning system and method |
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| CN202310218107.2A Pending CN116298682A (en) | 2023-03-08 | 2023-03-08 | Power distribution network fault positioning system and method |
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- 2023-03-08 CN CN202310218107.2A patent/CN116298682A/en active Pending
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