CN112290450B - Self-driven sensing method for galloping state of power transmission line - Google Patents
Self-driven sensing method for galloping state of power transmission line Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F16/903—Querying
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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Abstract
The invention relates to a self-driven sensing method for a galloping state of a power transmission line, and belongs to the technical field of intelligent power grids. The method comprises the following steps: s1: building a test system of a swing type electromagnetic vibration energy collector, simulating the swing state of different power transmission lines by using a vibration exciter to obtain corresponding output electric signals, and taking the output electric signals as the characteristic parameters of the self-driven sensing of the system; analyzing the change rule between the output electric signal of the collector and the line galloping state parameters, constructing the qualitative relation between the self-driven sensing characteristic parameters and the line galloping state, and establishing a self-driven sensing characteristic parameter information database of different line galloping states; s2: and (4) establishing a self-driven sensing system for monitoring the galloping state of the power transmission line, comparing and analyzing the acquired electric signals and the self-driven sensing characteristic parameter information in the database established in the step S1 by adopting a cluster analysis method, judging the galloping state and degree of the line, and realizing intelligent sensing of the galloping state of the power transmission line.
Description
Technical Field
The invention belongs to the technical field of intelligent power grids, and relates to a self-driven sensing method for a galloping state of a power transmission line.
Background
In recent years, power transmission networks of power systems in China are developing in a direction of overall coverage, and power transmission lines are a crucial part in power grid construction and directly influence safe and stable operation of the power systems. The power transmission line is exposed in natural conditions for a long time, and not only faces to natural invasion such as subsidence, landslide, dirt, strong wind, lightning stroke and the like, but also bears the problems of normal mechanical load, icing load, mechanical fault, internal pressure of power load and line galloping caused by other random factors. The galloping of the power transmission line is easy to have accidents of line flashover tripping, hardware damage, even disconnection and the like, and seriously threatens the stable operation of the power transmission network. Therefore, in order to reduce the occurrence of transmission line galloping accidents and improve the safe and stable operation of the power system, research on transmission line galloping state monitoring technology needs to be deeply conducted.
With the rapid development of information technology, the intelligent demand in power grid construction and management is more and more emphasized, and overhead power transmission lines are gradually adopting an online monitoring technology to monitor the galloping state of the overhead power transmission lines, wherein the online monitoring technology comprises an image acquisition technology, a distributed sensor monitoring technology, an optical fiber sensor monitoring technology and the like.
The existing on-line monitoring system for the galloping of the power transmission line is usually installed on a power tower, and in order to obtain the condition of the power transmission line in time, various devices such as a sensor, a processor, a wireless transmission unit and the like need to be installed on the tower, so that the state information and the environmental parameters of the power transmission line can be continuously monitored for 24 hours all year round. Despite the adoption of various advanced ultra-low power microprocessors and other low power consumption devices, the power consumption of the on-line monitoring system of the power transmission line is still large, and the long-term power supply technology of the on-line monitoring system becomes a huge short board which restricts the reliable operation of the on-line monitoring system.
Aiming at the defects of the energy supply technology of the current transmission line on-line monitoring sensing node, a self-driven sensing system suitable for on-line monitoring of transmission line galloping needs to be designed urgently, self-powered operation of the sensing node is met through electromechanical energy conversion of the transmission line in the galloping state, and finally self-driven sensing of the transmission line galloping state is achieved.
Disclosure of Invention
In view of the above, the invention aims to provide a self-driven sensing method for a galloping state of a power transmission line, which is used for constructing a self-driven sensing system for the galloping state of the power transmission line aiming at the galloping problem of the overhead power transmission line, and realizing intelligent sensing of the galloping state of the power transmission line by acquiring self-driven sensing characteristics representing the galloping state of the power transmission line.
In order to achieve the purpose, the invention provides the following technical scheme:
a self-driven sensing method for the galloping state of a power transmission line specifically comprises the following steps:
s1: building a test system of a swing type electromagnetic vibration energy collector, simulating the swing state of different power transmission lines by using a vibration exciter to obtain corresponding output electric signals, and taking the output electric signals as the characteristic parameters of the self-driven sensing of the system; analyzing the change rule between the output electric signal of the collector and the line galloping state parameters, constructing a qualitative relation between the self-driven sensing characteristic parameters and the line galloping state based on an SPSS (statistical Product and Service solutions) correlation analysis method, and establishing self-driven sensing characteristic parameter information databases of different line galloping states;
s2: and (4) setting up a self-driven sensing system for monitoring the galloping state of the power transmission line, comparing and analyzing the electric signals acquired by the self-driven sensing system in the galloping state of the power transmission line with the self-driven sensing characteristic parameter information in the database established in the step S1 by adopting a cluster analysis method, judging the galloping state and degree of the line, and realizing intelligent sensing of the galloping state of the power transmission line.
Further, in step S1, the built test system of the oscillating electromagnetic vibration energy harvester includes: the device comprises an electromagnetic vibration energy collector, a lead, a vibration exciter, a power amplifier, a vibration controller, an acceleration sensor, an oscilloscope and a computer;
firstly, connecting one end of a wire with a vibration exciter, penetrating the other end of the wire through a swing type electromagnetic vibration energy collector, and connecting the collector into an oscilloscope through a load; sinusoidal vibration excitation is applied to the conducting wire through the vibration exciter, so that a stator and a rotor in the electromagnetic vibration energy collector are driven to move relatively, a stator coil cuts a magnetic field to generate induced electromotive force, and the electric energy output of the collector is realized;
secondly, detecting the real-time frequency and amplitude of the vibration exciter by using an acceleration sensor, transmitting signals of the real-time frequency and amplitude to a computer through a vibration controller, processing the acceleration signals by the computer, giving out control signals of the next moment according to the processing result, and adjusting the strength of vibration signals through a power amplifier, thereby realizing the real-time control of the vibration exciter;
and finally, applying harmonic excitation with different frequencies, amplitudes and accelerations to the electromagnetic vibration energy collector to obtain a curve of the output voltage of the energy collector changing along with the frequency, and analyzing the change rule of the voltage-frequency curve to obtain the response bandwidth of the energy collector under different frequencies and amplitudes.
Further, in step S2, the self-driven sensing system for monitoring the galloping state of the power transmission line is built, and includes: the system comprises a power transmission line, an electromagnetic vibration energy collector, distributed sensors (an inertial sensor and an acceleration sensor), a data acquisition terminal, a wireless communication module and the like;
firstly, an electromagnetic vibration energy collector is installed on a power transmission line and is connected to a data acquisition terminal through a load, the electromagnetic vibration energy collector works in a line waving state, and the data acquisition terminal receives an electric signal output by the energy collector and transmits the electric signal to a monitoring master station through a wireless sensing network; secondly, laying an inertial sensor, an acceleration sensor, a data acquisition terminal and a wireless communication module in the power transmission line system, wherein the inertial sensor, the acceleration sensor, the data acquisition terminal and the wireless communication module are all powered by an electromagnetic vibration energy collector; and finally, comparing and analyzing the electric signals acquired by the system in the field line galloping state with self-driven sensing characteristic parameter information in a database established under a laboratory condition by adopting a cluster analysis method, judging the line galloping state and degree, and realizing intelligent sensing of the galloping state of the power transmission line.
Further, in step S2, a cluster analysis method is used to compare and analyze the electric signals acquired by the self-driven sensing system in the galloping state of the power transmission line with the self-driven sensing characteristic parameter information in the database established in step S1, specifically, a gray correlation evaluation method is used to divide the galloping state of the power transmission line into a plurality of standard states, each standard state corresponds to a characteristic vector representing the state of the power transmission line, the correlation degree analysis is performed on the acquired electric signals and each known standard state in the database, and according to the correlation degree, which state the state to be diagnosed belongs to is determined.
Further, an electromagnetic vibration energy harvester comprising: stator, rotor, rolling bearing 4 and housing 2; the stator comprises a stator magnetic yoke 8, a stator magnetic tooth 7, an iron core 10 and a coil 11 wound on the iron core; the rotor comprises a rotor yoke 5, rotor magnetic teeth 6 and rotor permanent magnets 9.
The inner surface of the rolling bearing 4 is fixed to the housing 2, and the outer surface thereof is fixed to the rotor. A round hole is arranged in the rotor magnetic yoke 5 and is embedded into the rolling bearing 4; the diameter of the outer surface of the rotor magnetic yoke is equal to the diameter of the inner surface provided with the rotor magnetic teeth 6. Two groups of stator magnet yokes 8 and rotor magnet yokes 5 are symmetrically arranged at two ends of the rolling bearing 4; the two stator magnet yokes 8 are connected through an iron core 10, and two ends of the iron core 10 are fixed on the symmetrical stator magnetic teeth 7; the two rotor magnetic yokes 5 are connected through a rotor permanent magnet 9, and two ends of the rotor permanent magnet 9 are fixed on the symmetrical rotor magnetic teeth 6.
Further, the inner surface of the rolling bearing 4 is provided with an insulating layer 3, and the insulating layer 3 is tightly attached to and fixes the lead.
Further, the housing 2 is made of a non-magnetic material.
Further, the stator/rotor magnetic yoke and the stator/rotor magnetic teeth are made of silicon steel materials, and the rotor permanent magnet 9 is made of rare earth materials with magnetic energy product, coercive force and remanence ratio.
The invention has the beneficial effects that: aiming at the problem of galloping of the overhead transmission line, the invention designs the electromagnetic vibration energy collector which is used for constructing a self-driven sensing system oriented to the galloping state of the transmission line, and the intelligent sensing of the galloping state of the transmission line is realized by acquiring the self-driven sensing characteristic representing the galloping state of the transmission line.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a three-dimensional vertical structural view of an electromagnetic vibration energy collector;
FIG. 2 is a perspective transverse structural view of an electromagnetic vibration energy harvester;
FIG. 3 is a schematic view of a test platform of the oscillating electromagnetic vibration energy harvester;
FIG. 4 is a diagram of a self-driven sensing system architecture for monitoring the galloping state of a power transmission line;
reference numerals: 1-wire, 2-shell, 3-insulating layer, 4-rolling bearing, 5-rotor magnetic yoke, 6-rotor magnetic tooth, 7-stator magnetic tooth, 8-stator magnetic yoke, 9-rotor permanent magnet, 10-iron core and 11-coil.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts 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 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 terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion 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 invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 4, fig. 1 and 2 show an electromagnetic vibration energy collector designed according to the present invention for the waving characteristics of an overhead power transmission line, including: stator, rotor, rolling bearing 4 and housing 2; the stator comprises a stator magnetic yoke 8, a stator magnetic tooth 7, an iron core 10 and a coil 11 wound on the iron core; the rotor comprises a rotor yoke 5, rotor magnetic teeth 6 and rotor permanent magnets 9.
The inner surface of the rolling bearing 4 is fixed to the housing 2, and the outer surface thereof is fixed to the rotor. The shell, the stator, the inner diameter of the rolling bearing and the conducting wire are integrated into a whole, and A is marked; the outer diameters of the rotor and the rolling bearing are integrated, and marked B. When the wire waves, the wire drives the A to move integrally relative to the B, but the B is considered to move relative to the A from a relative movement angle. Therefore, the conductor galloping causes the relative motion of the stator and the rotor, and the magnetic flux passing through the air gap between the stator and the rotor changes to generate induced electromotive force.
A circular hole is arranged in the rotor magnetic yoke 5, the rolling bearing 4 is embedded in the circular hole and used for conducting mechanical energy of waving so as to promote the stator and the rotor to move relatively, and polytetrafluoroethylene is arranged on the contact part of the lead and the model so as to ensure insulation. The inner surface of the rolling bearing 4 is provided with an insulating layer 3. The diameter of the outer surface of the rotor magnetic yoke is equal to the diameter of the inner surface provided with the rotor magnetic teeth 6. Two groups of stator magnet yokes 8 and rotor magnet yokes 5 are symmetrically arranged at two ends of the rolling bearing 4; the two stator magnet yokes 8 are connected through an iron core 10, and two ends of the iron core 10 are fixed on the symmetrical stator magnetic teeth 7; the two rotor magnetic yokes 5 are connected through a rotor permanent magnet 9, and two ends of the rotor permanent magnet 9 are fixed on the symmetrical rotor magnetic teeth 6.
The magnetic yoke and the magnetic teeth are made of silicon steel materials, the permanent magnet is made of rare earth materials with high magnetic energy product, coercive force and residual magnetism, namely neodymium iron boron (NdFeB), and the shell is made of non-magnetic aluminum.
The electromagnetic vibration energy collector is fixed on a wire through an insulating layer on a rotor, a permanent magnet on the rotor generates a fixed magnetic field, the wire in a waving state drives a rolling bearing to move so as to drive the rotor to rotate, a coil on the stator cuts the magnetic field, and magnetic flux passing through a stator coil changes along with relative motion between the stator and the rotor so as to generate induced electromotive force in the coil, and finally electromechanical energy conversion of the device in the wire waving state is realized.
As shown in fig. 3, a test system of the oscillating electromagnetic vibration energy harvester is constructed, and the system is composed of the electromagnetic vibration energy harvester, a lead, a vibration exciter, a power amplifier, a vibration controller, an acceleration sensor, an oscilloscope, a computer and the like. Firstly, one end of a wire is connected with a vibration exciter, the other end of the wire penetrates through a swing type electromagnetic vibration energy collector, and the collector is connected into an oscilloscope through a load. Sinusoidal vibration excitation is applied to the conducting wire through the vibration exciter, so that the stator and the rotor in the electromagnetic vibration energy collector are driven to move relatively, the stator coil cuts a magnetic field to generate induced electromotive force, and the electric energy output of the collector is realized. Secondly, the acceleration sensor is used for detecting the real-time frequency and amplitude of the vibration exciter, signals of the vibration exciter are transmitted to the computer through the vibration controller, the computer processes the acceleration signals, next-moment control signals are given according to processing results, the strength of the vibration signals is adjusted through the power amplifier, and therefore the real-time control over the vibration exciter is achieved. And finally, applying harmonic excitation with different frequencies, amplitudes and accelerations to the electromagnetic vibration energy collector to obtain a curve of the output voltage of the energy collector changing along with the frequency, and analyzing the change rule of the voltage-frequency curve to obtain the response bandwidth of the energy collector under different frequencies and amplitudes.
Based on the built electromagnetic vibration energy acquisition system, aiming at characteristic parameters (waving amplitude and frequency) of a circuit waving machine in a trigger state, a vibration exciter is utilized to simulate waving states (frequency: 0.1-3 Hz and amplitude: 5-300 times) of different power transmission lines, and corresponding output electric signals are obtained and serve as the self-driven sensing characteristic parameters of the system. Further analyzing the change rule between the output electric signal of the collector and the line galloping state parameters, and establishing a qualitative relation between the self-driven sensing characteristic parameters and the line galloping state and establishing a self-driven sensing characteristic parameter information database of different line galloping states based on an SPSS (statistical Product and Service solutions) correlation analysis method.
As shown in fig. 4, a self-driven sensing system for monitoring the galloping state of the power transmission line is constructed, and the system comprises the power transmission line, an electromagnetic vibration energy collector, distributed sensors (an inertial sensor and an acceleration sensor), a data acquisition terminal, a wireless communication module and the like. Firstly, an electromagnetic vibration energy collector is installed on a power transmission line and is connected into a data acquisition terminal through a load, the electromagnetic vibration energy collector works in a line waving state, and the data acquisition terminal receives an electric signal output by the energy collector and transmits the electric signal to a monitoring master station through a wireless sensing network. Secondly, the inertial sensor, the acceleration sensor, the data acquisition terminal and the wireless communication module are laid in the power transmission line system, and the inertial sensor, the acceleration sensor, the data acquisition terminal and the wireless communication module are all powered by the electromagnetic vibration energy collector. Finally, aiming at the electric signals collected by the system in the field line galloping state, the electric signals are compared and analyzed with self-driven sensing characteristic parameter information in a database established under laboratory conditions by adopting a cluster analysis method, the line galloping state and degree are judged, and intelligent sensing of the transmission line galloping state is realized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A self-driven sensing method for the galloping state of a power transmission line is characterized by comprising the following steps:
s1: building a test system of a swing type electromagnetic vibration energy collector, simulating the swing state of different power transmission lines by using a vibration exciter to obtain corresponding output electric signals, and taking the output electric signals as the characteristic parameters of the self-driven sensing of the system; analyzing the change rule between the output electric signal of the collector and the line galloping state parameters, constructing the qualitative relation between the self-driven sensing characteristic parameters and the line galloping state, and establishing a self-driven sensing characteristic parameter information database of different line galloping states;
in step S1, the built test system of the oscillating electromagnetic vibration energy harvester includes: the device comprises an electromagnetic vibration energy collector, a lead, a vibration exciter, a power amplifier, a vibration controller, an acceleration sensor, an oscilloscope and a computer;
firstly, connecting one end of a wire with a vibration exciter, penetrating the other end of the wire through an electromagnetic vibration energy collector, and connecting the collector into an oscilloscope through a load; sinusoidal vibration excitation is applied to the conducting wire through the vibration exciter, so that a stator and a rotor in the electromagnetic vibration energy collector are driven to move relatively, a stator coil cuts a magnetic field to generate induced electromotive force, and the electric energy output of the collector is realized; secondly, detecting the real-time frequency and amplitude of the vibration exciter by using an acceleration sensor, transmitting signals of the real-time frequency and amplitude to a computer through a vibration controller, processing the acceleration signals by the computer, giving out control signals of the next moment according to the processing result, and adjusting the strength of vibration signals through a power amplifier, thereby realizing the real-time control of the vibration exciter; finally, applying harmonic excitation with different frequencies, amplitudes and accelerations to the electromagnetic vibration energy collector to obtain a curve of the output voltage of the energy collector changing along with the frequency, and analyzing the change rule of the voltage-frequency curve to obtain the response bandwidth of the energy collector under different frequencies and amplitudes;
s2: setting up a self-driven sensing system for monitoring the galloping state of the power transmission line, comparing and analyzing the electric signals acquired by the self-driven sensing system in the galloping state of the power transmission line with the self-driven sensing characteristic parameter information in the database established in the step S1 by adopting a cluster analysis method, judging the galloping state and degree of the power transmission line, and realizing intelligent sensing of the galloping state of the power transmission line;
in step S2, the self-driven sensing system for monitoring the galloping state of the power transmission line is constructed, including: the system comprises a power transmission line, an electromagnetic vibration energy collector, a distributed sensor, a data acquisition terminal and a wireless communication module;
firstly, an electromagnetic vibration energy collector is installed on a power transmission line and is connected to a data acquisition terminal through a load, the electromagnetic vibration energy collector works in a line waving state, and the data acquisition terminal receives an electric signal output by the energy collector and transmits the electric signal to a monitoring master station through a wireless sensing network; secondly, laying an inertial sensor, an acceleration sensor, a data acquisition terminal and a wireless communication module in the power transmission line system, wherein the inertial sensor, the acceleration sensor, the data acquisition terminal and the wireless communication module are all powered by an electromagnetic vibration energy collector; and finally, comparing and analyzing the electric signals acquired by the system in the field line galloping state with self-driven sensing characteristic parameter information in a database established under a laboratory condition by adopting a cluster analysis method, judging the line galloping state and degree, and realizing intelligent sensing of the galloping state of the power transmission line.
2. A self-driven sensing method according to claim 1 wherein said electromagnetic vibration energy harvester comprises: a stator, a rotor, a rolling bearing (4) and a housing (2); the stator comprises a stator magnetic yoke (8), stator magnetic teeth (7), an iron core (10) and a coil (11) wound on the iron core; the rotor comprises a rotor magnetic yoke (5), rotor magnetic teeth (6) and rotor permanent magnets (9);
the inner surface of the rolling bearing (4) is fixed with the shell (2), and the outer surface of the rolling bearing is fixed with the rotor; a round hole is formed in the rotor magnetic yoke (5) and is embedded into the rolling bearing (4); the diameter of the outer surface of the rotor magnetic yoke (5) is equal to the diameter of the inner surface of the rotor magnetic tooth (6); two groups of stator magnet yokes (8) and rotor magnet yokes (5) are symmetrically arranged at two ends of the rolling bearing (4); the two stator magnet yokes (8) are connected through an iron core (10), and two ends of the iron core (10) are fixed on the symmetrical stator magnetic teeth (7); the two rotor magnet yokes (5) are connected through a rotor permanent magnet (9), and two ends of the rotor permanent magnet (9) are fixed on the symmetrical rotor magnetic teeth (6).
3. Self-driven sensing method according to claim 2, characterised in that the inner surface of the rolling bearing (4) is provided with an insulating layer (3), the insulating layer (3) being applied against the fixed conductor.
4. Self-driven sensing method according to claim 2, characterized in that the housing (2) is made of a magnetically non-conductive material.
5. A self-driven sensing method according to claim 2, characterized in that the stator/rotor yoke, the stator/rotor teeth are made of silicon steel material, and the rotor permanent magnet (9) is made of rare earth material with magnetic energy product, coercive force and remanence ratio.
6. The self-driven sensing method according to claim 1, wherein in step S2, a cluster analysis method is used to compare and analyze the electrical signals collected by the self-driven sensing system in the galloping state of the power transmission line with the self-driven sensing characteristic parameter information in the database established in step S1, specifically, a gray correlation evaluation method is used to divide the galloping state of the power transmission line into a plurality of standard states, each standard state corresponds to a feature vector representing its state, the collected electrical signals are used to perform correlation analysis with each known standard state in the database, and according to the magnitude of the correlation, which state the galloping state belongs to is determined.
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| CN202011120172.4A CN112290450B (en) | 2020-10-19 | 2020-10-19 | Self-driven sensing method for galloping state of power transmission line |
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| CN202011120172.4A CN112290450B (en) | 2020-10-19 | 2020-10-19 | Self-driven sensing method for galloping state of power transmission line |
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| CN112290450B true CN112290450B (en) | 2021-11-09 |
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| CN102819646A (en) * | 2012-05-31 | 2012-12-12 | 山东电力集团公司青岛供电公司 | Line galloping power system operation simulation method |
| CN103810077A (en) * | 2013-08-24 | 2014-05-21 | 国家电网公司 | Integrated intelligent monitoring system for leads |
| CN109948839A (en) * | 2019-03-06 | 2019-06-28 | 国网河南省电力公司电力科学研究院 | The prediction of overhead transmission line galloping risk and method for early warning and system |
| CN111209275A (en) * | 2019-12-30 | 2020-05-29 | 中国电力科学研究院有限公司 | Power transmission line wind vibration disaster feature identification method and system based on data knowledge base |
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| US6448686B1 (en) * | 2000-12-08 | 2002-09-10 | General Electric Company | Packaged stator core and method forming the same |
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