Cable vibration state monitoring method and device, electronic equipment and storage medium

Abstract

The invention relates to a cable vibration state monitoring method and device, electronic equipment and a storage medium, and belongs to the technical field of cable monitoring, and the method comprises the steps: obtaining vibration data of a cable in a preset time period through a grating array vibration sensing optical fiber in the cable; the vibration data comprises amplitude data and vibration frequency data; converting the vibration data into time spectrum image data through Fourier transform; and inputting the time spectrum image data into the trained cable vibration state recognition model to obtain the current vibration state of the cable. According to the invention, the vibration data of the cable during small-amplitude movement can be monitored through the grating array vibration sensing optical fiber, the vibration data is converted into the time spectrum image data, and then the vibration state of the cable is identified based on the time spectrum image data through the model. The vibration state of the cable is recognized based on the overall motion state of the cable in the preset time period, and recognition is more accurate.

Description

Technical Field

[0001] The present invention relates to the field of cable monitoring technology, and in particular to a cable vibration state monitoring method, device, electronic equipment and storage medium. Background Art

[0002] Optical Fiber Composite Overhead Ground Wire (OPGW) is a special power optical cable that integrates the functions of communication line and overhead ground wire. OPGW is generally distributed in a long range from several kilometers to tens of kilometers. Under a certain wind load, it will vibrate, causing fatigue of metal strands. In severe cases, it will cause strand breakage and endanger the stability of the power communication system. The fatigue caused by vibration will greatly endanger the safe service life of the pole tower connection. Therefore, it is necessary to monitor and evaluate the vibration state to avoid more serious power grid accidents. In addition, due to the influence of external factors such as weather, OPGW may cause abnormal large amplitude and low frequency swings, causing circuit tripping, damage or even breakage of optical cables, resulting in large-scale power outages and huge economic losses. Therefore, it is also necessary to monitor the dancing state of OPGW. Transmission lines are the basis for the stable operation of power systems. Breeze vibration and dancing of conductors can lead to serious accidents such as pole tower collapse and communication interruption. Therefore, strengthening the monitoring of vibration and dancing state of transmission lines is of great significance to ensure the stable operation of the power grid and reduce national economic losses.

[0003] Since it can utilize existing optical fiber communication links and avoid strong electromagnetic interference to general electromagnetic sensors, achieving distributed passive monitoring, optical fiber sensors should be the best choice for power transmission and communication line maintenance and fault alarm. The use of optical fiber sensors to achieve online cable monitoring is gradually becoming an important research direction for technological development. However, existing optical fiber sensing technology cannot solve the distributed large-scale monitoring of small-amplitude motion states, and when the existing technology uses optical fiber sensors to monitor cable vibration conditions, it cannot comprehensively judge the vibration conditions of the cable based on the overall motion state of the cable. Summary of the invention

[0004] In view of this, it is necessary to provide a cable vibration state monitoring method, device, electronic device and storage medium to solve the problem that the existing technology cannot perform distributed large-scale monitoring of small-amplitude motion states, and cannot comprehensively judge the vibration condition of the cable based on the overall motion state of the cable.

[0005] In order to solve the above problems, in a first aspect, the present invention provides a method for monitoring the vibration state of a cable, wherein the cable includes a grating array vibration sensing optical fiber, and the method comprises: Acquiring first vibration data of the cable within a preset time period through the grating array vibration sensing optical fiber; the first vibration data includes amplitude data and vibration frequency data; converting the first vibration data into first time spectrum image data by Fourier transform; The first time spectrum image data is input into a trained cable vibration state recognition model to obtain the current vibration state of the cable; the current vibration state includes: at least one of normal working conditions, breeze vibration and dancing.

[0006] Optionally, converting the first vibration data into first time spectrum image data by Fourier transform includes: Performing bandpass filtering on the first vibration data to obtain second vibration data within a preset frequency range; Dividing the second vibration data according to preset time windows to obtain third vibration data corresponding to each of the time windows; Converting the third vibration data corresponding to each of the time windows into second time spectrum image data by short-time Fourier transform; The second time-spectrum image data are combined to obtain first time-spectrum image data.

[0007] Optionally, the cable vibration state recognition model is trained in the following manner: Acquire target sample time spectrum image data; Determining a real vibration state corresponding to the target sample time spectrum image data; Inputting the target sample time spectrum image data into the cable vibration state recognition model to obtain the predicted vibration state of the target sample time spectrum image data; The cable vibration state identification model is adjusted based on the actual vibration state and the predicted vibration state.

[0008] Optionally, the acquiring target sample time spectrum image data includes: Acquire initial sample time spectrum image data; The initial sample time spectrum image data is preprocessed to obtain target sample time spectrum image data; wherein the preprocessing includes sliding window segmentation processing and data enhancement processing.

[0009] Optionally, the initial sample time-frequency spectrum image data includes: first initial sample time-frequency spectrum image data obtained by monitoring actual working conditions, and second initial sample time-frequency spectrum image data obtained by testing a simulation model.

[0010] Optionally, the cable is an optical fiber overhead ground wire composite cable, and the optical fiber overhead ground wire composite cable includes an optical fiber unit surrounded by a steel pipe, and the optical fiber unit includes a communication optical fiber and the grating array vibration sensing optical fiber.

[0011] Optionally, the method further includes: When the current vibration state is dancing, an alarm message is generated.

[0012] In a second aspect, the present invention further provides a cable vibration state monitoring device, wherein the cable includes a grating array vibration sensing optical fiber, and the device includes: A first vibration data acquisition module, used to acquire first vibration data of the cable within a preset time period through the grating array vibration sensing optical fiber; the first vibration data includes amplitude data and vibration frequency data; A first time spectrum image data acquisition module, used for converting the first vibration data into first time spectrum image data through Fourier transform; The current vibration state judgment module is used to input the first time spectrum image data into the trained cable vibration state recognition model to obtain the current vibration state of the cable; the current vibration state includes: at least one of normal working conditions, breeze vibration and dancing.

[0013] In a third aspect, the present invention also provides an electronic device comprising a memory and a processor, wherein the memory is used to store programs; and the processor is coupled to the memory and is used to execute the programs stored in the memory to implement the steps in any one of the above-mentioned cable vibration status monitoring methods.

[0014] In a fourth aspect, the present invention further provides a computer-readable storage medium for storing a computer-readable program, wherein the program or instruction, when executed by a processor, can implement the steps in any one of the above-mentioned cable vibration status monitoring methods.

[0015] The beneficial effects of the present invention are: The first vibration data of the cable within a preset time period is obtained through the grating array vibration sensing optical fiber in the cable; the first vibration data includes amplitude data and vibration frequency data; the first vibration data is converted into first time spectrum image data through Fourier transform; then the first time spectrum image data is input into the trained cable vibration state recognition model to obtain the current vibration state of the cable; the current vibration state includes: at least one of normal working conditions, breeze vibration and dancing. The present invention can also monitor the small amplitude movement of the cable through the grating array vibration sensing optical fiber. By converting the first vibration data obtained by monitoring into the first time spectrum image data, and then identifying the current vibration state of the cable based on the first time spectrum image data through the model, that is, the vibration state of the cable is identified based on the overall movement state of the cable within the preset time period, and the identification is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a flow chart of an embodiment of a cable vibration state monitoring method provided by the present invention; Figure 2 A schematic diagram of the structure of an optical fiber overhead ground wire composite cable provided by the present invention; Figure 3 A schematic structural diagram of an embodiment of a cable vibration status monitoring device provided by the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone.

[0019] The descriptions of "first", "second", etc. involved in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] Reference Figure 1 , shows a schematic flow chart of an embodiment of a cable vibration state monitoring method provided by the present invention, wherein the cable includes a grating array vibration sensing optical fiber, and the method includes: S101, obtaining first vibration data of the cable within a preset time period through a grating array vibration sensing optical fiber; the first vibration data includes amplitude data and vibration frequency data.

[0022] A grating array is a fiber with multiple grating sensors embedded in it. The grating array vibration sensing fiber obtains the vibration information of the fiber by measuring the change in the wavelength of the grating reflected light. When the fiber is vibrated, the wavelength of the grating's reflected light changes, thus reflecting the vibration information.

[0023] The vibration data collected by the grating array vibration sensing optical fiber is usually time series data, which represents the change of the wavelength of the grating reflected light at different time points. The grating array vibration sensing optical fiber can be connected to a grating array demodulation instrument, and the grating array demodulation instrument demodulates the above time series data to obtain the first vibration data within a preset time period, and the first vibration data includes amplitude data and vibration frequency data.

[0024] S102: Convert the first vibration data into first time spectrum image data through Fourier transform.

[0025] The first time spectrum image is an image for showing the change of amplitude over time and vibration frequency. The first time spectrum image data may include data points in the first time spectrum image.

[0026] S103, inputting the first time spectrum image data into a trained cable vibration state recognition model to obtain a current vibration state of the cable; the current vibration state includes: at least one of normal working condition, breeze vibration and dancing.

[0027] The cable vibration state recognition model can be a classifier for recognizing the input first time spectrum image data to determine the current vibration state corresponding to the first time spectrum image data; the current vibration state mainly includes: normal working condition, breeze vibration and dancing.

[0028] The embodiment of the present invention can monitor the small amplitude movement of the cable through the grating array vibration sensing optical fiber, so the first vibration data obtained is more comprehensive, and the vibration state of the cable based on the first vibration data is more accurately judged. In addition, compared with the prior art that simply judges whether the amplitude of the cable reaches the amplitude threshold, if the amplitude reaches the amplitude threshold, it is determined that the cable has vibrated or danced, the embodiment of the present invention converts the first vibration data obtained by monitoring into first time spectrum image data, and then identifies the current vibration state of the cable based on the first time spectrum image data through a model, that is, the vibration state of the cable is identified based on the overall movement state of the cable within a preset time period, and the identification is more accurate.

[0029] In one embodiment, S102 may specifically include: performing bandpass filtering on the first vibration data to obtain second vibration data within a preset frequency range; dividing the second vibration data according to preset time windows to obtain third vibration data corresponding to each time window; converting the third vibration data corresponding to each time window into second time spectrum image data using short-time Fourier transform; and combining each second time spectrum image data to obtain first time spectrum image data.

[0030] Bandpass filtering is a signal processing technique used to retain signals within a specific frequency range while suppressing signals of other frequencies. In this embodiment, the frequency range of the bandpass filter can be 0.1 Hz to 10 Hz. The preset time window can be 60 seconds. After the first vibration data is subjected to bandpass filtering to obtain the second vibration data, the second vibration data can be divided according to the 60-second time window to obtain the third vibration data corresponding to each time window, and then the third vibration data is converted and spliced ​​by short-time Fourier transform to obtain the first time spectrum image data.

[0031] In one embodiment, the cable vibration state recognition model can be trained in the following manner: obtaining target sample time spectrum image data; determining the actual vibration state corresponding to the target sample time spectrum image data; inputting the target sample time spectrum image data into the cable vibration state recognition model to obtain the predicted vibration state of the target sample time spectrum image data; and adjusting the cable vibration state recognition model based on the actual vibration state and the predicted vibration state.

[0032] After obtaining the target sample time spectrum image data, the real vibration state of the target sample time spectrum image data can be determined according to the fluctuation of the amplitude in time and the fluctuation of the amplitude in frequency in the target sample time spectrum image data; the real vibration state includes: normal working condition, breeze vibration and dancing.

[0033] Specifically, when the target sample time spectrum image data has the characteristics of stable amplitude\vibration frequency signal and no obvious fluctuation in background noise, it can be determined that the real vibration state of the target sample time spectrum image data is a normal working condition. When the target sample time spectrum image data has the characteristics of a stable characteristic vibration frequency signal on a stable signal background, and the amplitude of the characteristic vibration frequency signal is small (generally a few millimeters or more than ten millimeters), it can be determined that the real vibration state of the target sample time spectrum image data is breeze vibration. When the target sample time spectrum image data has the characteristics of violent signal fluctuations and large amplitude signals (generally more than 1 meter) in the low frequency band (generally 0.1 Hz~5 Hz), it can be determined that the real vibration state of the target sample time spectrum image data is dancing.

[0034] The step of determining the actual vibration state of the target sample time spectrum image data may be performed manually.

[0035] Afterwards, the target sample time spectrum image data can be input into the cable vibration state recognition model, and the predicted vibration state of the target sample time spectrum image data can be obtained through model prediction; then, the parameters of the cable vibration state recognition model are adjusted based on the actual vibration state and the predicted vibration state until the prediction result of the cable vibration state recognition model meets the requirements.

[0036] In one embodiment, the step of acquiring target sample time spectrum image data specifically includes: acquiring initial sample time spectrum image data; preprocessing the initial sample time spectrum image data to obtain target sample time spectrum image data; wherein the preprocessing includes sliding window segmentation processing and data enhancement processing.

[0037] Specifically, after obtaining the initial sample time spectrum image data, the initial sample time spectrum image data can be split into several independent data according to a certain time length and sliding window size. Then, in order to better identify the amplitude and frequency characteristics in each independent data, the signal enhancement processing can be performed on each independent data by using the frequency band slicing method.

[0038] In one embodiment, the initial sample time spectrum image data may include: first initial sample time spectrum image data obtained by monitoring actual working conditions, and second initial sample time spectrum image data obtained by testing a simulation model. The initial sample time spectrum image data may be enriched by acquiring the initial sample time spectrum image data in multiple ways.

[0039] The second initial sample time spectrum image data may be obtained by: modeling and analyzing the mechanical model of the current optical fiber overhead ground wire composite cable, testing and obtaining simulated vibration data, and then converting the simulated vibration data into the second initial sample time spectrum image data through Fourier transform.

[0040] In one embodiment, the second initial sample time-spectrum image data may also be verified by using the first initial sample time-spectrum image data.

[0041] In one embodiment, when the current vibration state is monitored to be dancing, an alarm message may be generated, and the alarm message may include information such as the alarm time, the current vibration state, and the alarm level.

[0042] The embodiment of the present invention trains the cable vibration state recognition model based on the target sample time spectrum image data, and then the vibration state of the input first time spectrum image data can be recognized through the trained cable vibration state recognition model, that is, the vibration state of the cable can be recognized based on the overall motion state of the cable within a preset time period, and the recognition is more accurate. After testing, the overall classification accuracy of the trained cable vibration state recognition model is 95%, the false alarm rate is 3%, and the missed alarm rate is 2%, indicating that the model can effectively recognize most alarm events with a high recognition accuracy.

[0043] In one embodiment, the cable may be an optical fiber overhead ground wire composite cable, which includes an optical fiber unit surrounded by a steel tube, wherein the optical fiber unit includes a communication optical fiber and a grating array vibration sensing optical fiber.

[0044] Reference Figure 2 , showing a schematic diagram of the structure of an optical fiber overhead ground wire composite cable provided by the present invention. The optical fiber overhead ground wire composite cable may include multiple metal conductors and an optical fiber unit, the metal conductors are used to transmit power, the optical fiber unit is wrapped by aluminum-clad steel wires, and the optical fiber unit includes multiple optical fibers such as communication optical fibers and grating array vibration sensing optical fibers.

[0045] Reference Figure 3 , shows a schematic structural diagram of an embodiment of a cable vibration state monitoring device provided by the present invention, wherein the cable includes a grating array vibration sensing optical fiber, and the device 200 includes: A first vibration data acquisition module 201 is used to acquire first vibration data of the cable within a preset time period through the grating array vibration sensing optical fiber; the first vibration data includes amplitude data and vibration frequency data; A first time spectrum image data acquisition module 202, configured to convert the first vibration data into first time spectrum image data by Fourier transform; The current vibration state judgment module 203 is used to input the first time spectrum image data into the trained cable vibration state recognition model to obtain the current vibration state of the cable; the current vibration state includes: at least one of normal working condition, breeze vibration and dancing.

[0046] It should be noted that the implementation principle or implementation process of the above modules can refer to the embodiment of the above-mentioned cable vibration state monitoring method, and will not be described one by one here.

[0047] In one embodiment, the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of any of the above-mentioned cable vibration status monitoring methods are implemented.

[0048] In one embodiment, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by the processor, the steps of any one of the cable vibration status monitoring methods described above are implemented.

[0049] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A cable vibration state monitoring method, characterized in that: The cable includes a grating array vibration sensing optical fiber, and the method includes: Acquiring first vibration data of the cable within a preset time period through the grating array vibration sensing optical fiber; the first vibration data includes amplitude data and vibration frequency data; converting the first vibration data into first time spectrum image data by Fourier transform; The first time spectrum image data is input into a trained cable vibration state recognition model to obtain the current vibration state of the cable; the current vibration state includes: at least one of normal working conditions, breeze vibration and dancing.

2. The cable vibration state monitoring method according to claim 1, characterized in that: The converting the first vibration data into first time spectrum image data by Fourier transform comprises: Performing bandpass filtering on the first vibration data to obtain second vibration data within a preset frequency range; Dividing the second vibration data according to preset time windows to obtain third vibration data corresponding to each of the time windows; Converting the third vibration data corresponding to each of the time windows into second time spectrum image data by short-time Fourier transform; The second time-spectrum image data are combined to obtain first time-spectrum image data.

3. The cable vibration state monitoring method according to claim 1, characterized in that: The cable vibration state recognition model is trained in the following way: Acquire target sample time spectrum image data; Determining a real vibration state corresponding to the target sample time spectrum image data; Inputting the target sample time spectrum image data into the cable vibration state recognition model to obtain the predicted vibration state of the target sample time spectrum image data; The cable vibration state identification model is adjusted based on the actual vibration state and the predicted vibration state.

4. The cable vibration state monitoring method according to claim 1, characterized in that: The step of acquiring target sample time spectrum image data comprises: Acquire initial sample time spectrum image data; The initial sample time spectrum image data is preprocessed to obtain target sample time spectrum image data; wherein the preprocessing includes sliding window segmentation processing and data enhancement processing.

5. The cable vibration state monitoring method according to claim 4, characterized in that: The initial sample time spectrum image data includes: first initial sample time spectrum image data obtained by monitoring the actual working condition, and second initial sample time spectrum image data obtained by testing the simulation model.

6. The cable vibration state monitoring method according to claim 1, characterized in that: The cable is an optical fiber overhead ground wire composite cable, which includes an optical fiber unit surrounded by a steel pipe, and the optical fiber unit includes a communication optical fiber and the grating array vibration sensing optical fiber.

7. The cable vibration state monitoring method according to claim 1, characterized in that: The method further comprises: When the current vibration state is dancing, an alarm message is generated.

8. A cable vibration status monitoring device, characterized in that: The cable includes a grating array vibration sensing optical fiber, and the device includes: A first vibration data acquisition module, used to acquire first vibration data of the cable within a preset time period through the grating array vibration sensing optical fiber; the first vibration data includes amplitude data and vibration frequency data; A first time spectrum image data acquisition module, used for converting the first vibration data into first time spectrum image data through Fourier transform; The current vibration state judgment module is used to input the first time spectrum image data into the trained cable vibration state recognition model to obtain the current vibration state of the cable; the current vibration state includes: at least one of normal working conditions, breeze vibration and dancing.

9. An electronic device, characterized in that: comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the cable vibration status monitoring method described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store computer-readable programs, wherein when the program or instructions are executed by a processor, the steps in the cable vibration status monitoring method described in any one of claims 1 to 7 can be implemented.

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