CN110850235A - Multi-terminal positioning algorithm and positioning system based on cable topology and fault transient traveling wave - Google Patents
Multi-terminal positioning algorithm and positioning system based on cable topology and fault transient traveling wave Download PDFInfo
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- CN110850235A CN110850235A CN201911185231.3A CN201911185231A CN110850235A CN 110850235 A CN110850235 A CN 110850235A CN 201911185231 A CN201911185231 A CN 201911185231A CN 110850235 A CN110850235 A CN 110850235A
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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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Abstract
The invention relates to a multi-terminal positioning algorithm and a positioning system based on cable topology and fault transient traveling waves, wherein a cable network is mapped into a topology comprising length, T connection points and monitoring point positions, and according to the monitoring point positions in a topological structure, the positions of different monitoring points form a double-terminal ranging system combined in pairs; reconstructing paths of fault signals generated at different sections of the cable and transmitted to different monitoring points, and calculating the signal attenuation condition of the paths so as to calculate possible signal characteristics of faults at different positions corresponding to the different monitoring points and accurately extract absolute time-taking signals; after the cable breaks down, determining the absolute time of the signal reaching a monitoring point according to the signals measured at two ends, and calculating a result matrix comprising all possible results; and finding out a unique fault position according to the line topological structure. The invention determines the position of the fault point in time, and achieves the aims of reducing the searching time of the fault point and shortening the fault repairing time.
Description
Technical Field
The invention relates to the technical field of power grid fault positioning, in particular to a multi-end positioning algorithm and a multi-end positioning system based on cable topology and fault transient traveling waves.
Background
With the rapid development of urban power grids, high-voltage cables are more and more widely applied and limited by geographical conditions, and a plurality of cables are connected or linked in a T mode, so that great difficulty is brought to the finding of cable faults under the condition that the network structure is more flexible. In this case, the non-fault down time due to the lengthy cable troubleshooting time affects the power supply reliability.
Disclosure of Invention
The invention aims to overcome the defects that the cable fault is difficult to find and position in the prior art, provides a multi-terminal positioning algorithm and a positioning system based on the cable topology and the fault transient traveling wave, and aims to determine the position of the fault point in time, reduce the finding time of the fault point and shorten the fault repairing time.
In order to solve the technical problems, the invention adopts the technical scheme that:
a multi-end positioning algorithm based on cable topology and fault transient traveling waves comprises the following steps:
s1: mapping the cable network into a topology comprising the length, the T-junction and the monitoring point position, and forming a double-end ranging system with two combinations at different monitoring point positions according to the monitoring point position in the topology structure;
s2: reconstructing paths of fault signals generated at different sections of the cable and transmitted to different monitoring points, and calculating the signal attenuation condition of the paths so as to calculate possible signal characteristics of faults at different positions corresponding to the different monitoring points and accurately extract absolute time-taking signals;
s3: after the cable breaks down, determining the absolute time of the signal reaching a monitoring point according to the signals measured at two ends, and calculating a result matrix comprising all possible results;
s4: and finding out a unique fault position according to the line topological structure.
In one embodiment, according to the length parameter, the wave velocity parameter and the whole line topology of each high-voltage cable line, the signal characteristics and the propagation characteristics of different types of faults occurring at all points on the line are analyzed, and original fault signals are restored.
In one embodiment, the extracted fault signal is calculated based on the line termination structure and associated equipment parameters.
Preferably, the fault signal is extracted using a contact sensor and a non-contact sensor.
In one embodiment, the accurate time of the fault signal reaching each measuring end is obtained, and the fault point is positioned by combining the accurate time with the network topology structure.
Preferably, the precise time is precise to within 20 nanoseconds.
Preferably, in step S3, the result matrix is:
wherein n is1nnIs represented by n1And nnThe fault positions calculated by the two monitoring points are sequentially substituted into A, and if the fault positions accord with all the results in the matrix, the positions areIs the true location of the fault.
The invention also provides a multi-end positioning system based on the cable topology and the fault transient traveling wave, wherein the multi-end positioning system comprises a background system and an acquisition and processing unit connected with the cable in the cable network, the acquisition and processing unit is provided with an information transmission device, the background system is provided with an information receiving device and a processor, and the information receiving device is connected with the processor.
Preferably, the acquisition and processing unit is provided with a digital-to-analog conversion module.
Preferably, the information transmission device is a public wireless network or a wired communication network.
Compared with the prior art, the invention has the following characteristics:
the technology adopts a method for measuring fault sensing absolute time based on high-voltage cable structure topology and cable terminals to perform online distance measurement and accurate distance measurement on cable faults, namely, when a fault occurs, fault electric signals are collected at each cable terminal, the collected signals are analyzed and processed, the starting absolute time of the fault signals contained in the signals is obtained, the position of the fault point is automatically determined through a special algorithm according to the absolute time and network topology, the online distance measurement of the fault is realized, the position of the fault point is determined in time, the purposes of reducing fault point searching time and shortening fault repairing time are achieved, and the safe and stable operation and the power supply reliability of a power system are ensured.
Drawings
FIG. 1 is a schematic flow chart of a method in an embodiment of the present invention.
Fig. 2 is a schematic diagram of system modules in an embodiment of the invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example (b):
as shown in fig. 1, the present invention provides a multi-terminal positioning algorithm based on cable topology and fault transient traveling wave, wherein the method comprises the following steps:
s1: mapping the cable network into a topology comprising the length, the T-junction and the monitoring point position, and forming a double-end ranging system with two combinations at different monitoring point positions according to the monitoring point position in the topology structure;
s2: reconstructing paths of fault signals generated at different sections of the cable and transmitted to different monitoring points, and calculating the signal attenuation condition of the paths so as to calculate possible signal characteristics of faults at different positions corresponding to the different monitoring points, accurately extracting absolute time-taking signals, and accurately obtaining the time within 20 nanoseconds;
s3: after the cable is in fault, determining the absolute time of arrival of the signals according to the signals measured at two ends, and calculating a result matrix comprising all possible results;
in step S3, the result matrix is:
wherein n is1nnIs represented by n1And nnThe fault positions calculated by the two monitoring points are sequentially substituted into A, and if the fault positions accord with all the results in the matrix, the fault positions are substituted into AThe location is the true location of the fault.
S4: and finding out a unique fault position according to the line topological structure.
According to the length parameters, wave speed parameters and the whole circuit topology of each high-voltage cable circuit, the signal characteristics and the propagation characteristics of all points on the circuit when different types of faults occur are analyzed, original fault signals are restored, fault signals are calculated and extracted according to the circuit terminal structure and the associated equipment parameters, and the fault signals are extracted by adopting a contact sensor and a non-contact sensor. And acquiring the accurate time of the fault signal reaching each measuring end, and positioning the fault point by combining the accurate time with the network topology structure.
As shown in fig. 2, the present invention further provides a multi-terminal positioning system based on cable topology and fault transient traveling wave, which includes a background system and an acquisition and processing unit connected to a cable in a cable network, wherein the acquisition and processing unit is provided with an information transmission device, the information transmission device is a public wireless network (GPRS) or a wired communication network, the background system is provided with an information receiving device and a processor, and the information receiving device is connected to the processor. The acquisition and processing unit is provided with a digital-to-analog conversion module for converting acquired analog signals into digital signals and transmitting the digital signals to the information receiving device through the information transmission device, the processor is connected with the information receiving device, the information is processed after the digital signals are received, and the fault position is determined according to a multi-terminal positioning algorithm. High-voltage cables in the cable network are connected through a T node.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The multi-end positioning algorithm based on the cable topology and the fault transient traveling wave is characterized by comprising the following steps of:
s1: mapping the cable network into a topology comprising the length, the T-junction and the monitoring point position, and forming a double-end ranging system with two combinations at different monitoring point positions according to the monitoring point position in the topology structure;
s2: reconstructing paths of fault signals generated at different sections of the cable and transmitted to different monitoring points, and calculating the signal attenuation condition of the paths so as to calculate possible signal characteristics of faults at different positions corresponding to the different monitoring points and accurately extract absolute time-taking signals;
s3: after the cable breaks down, determining the absolute time of the signal reaching a monitoring point according to the signals measured at two ends, and calculating a result matrix comprising all possible results;
s4: and finding out a unique fault position according to the line topological structure.
2. The multi-terminal positioning algorithm based on the cable topology and the fault transient traveling wave according to claim 1, wherein signal characteristics and propagation characteristics of different types of faults occurring at all points on a line are analyzed according to length parameters, wave speed parameters and the whole line topology of each high-voltage cable line, and original fault signals are restored.
3. The multi-terminal positioning algorithm based on cable topology and fault transient traveling waves according to claim 1, characterized in that the fault signal is calculated and extracted according to the line termination structure and associated equipment parameters.
4. The multi-terminal positioning algorithm based on cable topology and fault transient traveling waves of claim 3, characterized in that a contact sensor and a non-contact sensor are used to extract fault signals.
5. The multi-port positioning algorithm based on cable topology and fault transient traveling wave according to claim 1, wherein the precise time of arrival of the fault signal at each measurement port is obtained, and the fault point is positioned by combining with the network topology.
6. The multi-terminal positioning algorithm based on cable topology and fault transient traveling waves of claim 5, wherein the precise time is precise to within 20 nanoseconds.
7. The multi-terminal positioning algorithm based on cable topology and fault transient traveling wave according to claim 1, wherein in step S3, the result matrix is:
wherein n is1nnIs represented by n1And nnAnd (4) sequentially substituting the positions of the faults calculated by the two monitoring points into the A, and if the fault positions accord with all result matrixes in the matrix, determining the positions as the true fault positions.
8. The multi-end positioning system for the high-voltage cable topology and the fault transient traveling wave is characterized by comprising a background system and an acquisition and processing unit connected with a cable in a cable network, wherein the acquisition and processing unit is provided with an information transmission device, the background system is provided with an information receiving device and a processor, and the information receiving device is connected with the processor.
9. The multi-terminal positioning algorithm based on cable topology and fault transient traveling wave according to claim 8, wherein the collecting and processing unit is provided with a digital-to-analog conversion module.
10. The multi-terminal positioning algorithm based on cable topology and fault transient traveling wave according to claim 8, wherein the information transmission device is a public wireless network or a wired communication network.
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Cited By (1)
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| CN111965493A (en) * | 2020-08-31 | 2020-11-20 | 广东电网有限责任公司广州供电局 | Cable fault point positioning system |
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