Ground wire tension calculation method and device of overhead transmission line, electronic equipment and storage medium

Abstract

The invention discloses an overhead ground wire tension calculation method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a vibration acceleration signal, span, tension and mass per unit length of a ground wire; and converting the vibration acceleration signal to generate an acceleration spectrogram. All peak frequencies are extracted according to the acceleration spectrogram to generate a peak frequency sequence, the lowest frequency is marked as a first-order inherent frequency, the other peak frequencies are high-order inherent frequencies, the ratio of each high-order inherent frequency to the first-order inherent frequency is calculated to generate a theoretical order, and a target peak frequency is screened according to an error threshold value. And according to the first-order inherent frequency, the target peak frequency, the theoretical order, the span, the tension and the mass per unit length, calculating the tension of the ground wire. According to the invention, the accuracy and stability of tension measurement can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission lines, and particularly to a method, device, electronic device and storage medium for calculating the tension of conductors and ground wires of overhead transmission lines. Background Art

[0002] In overhead transmission lines, the tension of conductors and ground wires is a key factor determining their operating safety and stability. However, as the operating time of the conductors increases, affected by factors such as temperature, wind load, and icing, the conductor tension may change significantly, thereby affecting the performance and safety of the transmission line. To achieve real-time monitoring and accurate assessment of the tension of conductors and ground wires, current research and applications mainly rely on traditional tension measurement methods, including direct measurement methods and indirect calculation methods based on the reverse sag algorithm. These methods calculate the tension value by measuring specific parameters, such as the sag and span of the conductor, and combining theoretical models.

[0003] However, the existing methods have insufficient extraction and utilization of conductor state information and often rely on a variety of complex measurement parameters and mathematical models. Limited by changes in environmental conditions, these methods rely highly on measurement accuracy and are difficult to adapt to complex on-site working conditions. Therefore, how to reduce the influence of environmental conditions on the calculation results through the dynamic characteristics of conductors and ground wires and improve the accuracy of calculating the tension of conductors and ground wires has become a technical problem to be solved urgently. Summary of the Invention

[0004] Embodiments of the present invention provide a method, device, electronic device and storage medium for calculating the tension of conductors and ground wires of overhead transmission lines. By implementing the present invention, the calculation error caused by the large influence of changes in environmental conditions in the prior art can be solved, and the accuracy of calculating the tension of conductors and ground wires can be improved.

[0005] An embodiment of the present invention provides a method for calculating the tension of conductors and ground wires of overhead transmission lines, including:

[0006] Obtain the vibration acceleration signal, span, tension, and mass per unit length of the conductor and ground wire;

[0007] Perform transformation processing on the vibration acceleration signal of the conductor and ground wire to generate an acceleration frequency spectrum diagram;

[0008] Extract all peak frequencies according to the acceleration frequency spectrum diagram to generate a peak frequency sequence;

[0009] Denote the peak frequency with the lowest frequency in the peak frequency sequence as the first-order natural frequency, and denote the other peak frequencies in the peak frequency sequence except the first-order natural frequency as the higher-order natural frequencies;

[0010] Calculate the ratio of each higher-order natural frequency to the first-order natural frequency in turn to generate the theoretical order corresponding to the higher-order natural frequency;

[0011] Calculate the order error of each high-order natural frequency according to the first-order natural frequency, high-order natural frequencies, and the corresponding theoretical orders of the high-order natural frequencies; use the high-order natural frequencies with order errors not exceeding a preset error threshold as the target peak frequencies.

[0012] Calculate and generate the conductor tension according to the first-order natural frequency, each target peak frequency, the corresponding theoretical order of each target peak frequency, the span of the conductor, the tension of the conductor, and the mass per unit length of the conductor.

[0013] Further, a vibration acceleration sensor is provided on the surface of the conductor, and the obtaining of the vibration acceleration signal of the conductor includes:

[0014] Collect the vibration acceleration data of the vibration acceleration sensor after an impact hammer strikes a preset position on the conductor with a preset force to obtain the vibration acceleration signal of the conductor.

[0015] Further, the transforming and processing of the vibration acceleration signal of the conductor to generate an acceleration spectrogram includes:

[0016] Perform modal decomposition on the vibration acceleration signal of the conductor to generate a number of modal components;

[0017] Calculate the correlation coefficients between the modal components, and mark the modal components with correlation coefficients not exceeding a preset threshold with respect to other modal components as noise modal components;

[0018] Perform signal reconstruction on the modal components except the noise modal components to generate a reconstructed vibration acceleration signal;

[0019] Perform Fourier transform on the reconstructed vibration acceleration signal to generate an acceleration spectrogram.

[0020] Further, the extracting of all peak frequencies from the acceleration spectrogram to generate a peak frequency sequence includes:

[0021] Determine the frequency-domain peaks in the acceleration spectrogram through the following formula:

[0022]

[0023] where a is the acceleration spectrum amplitude; f is the frequency;

[0024] Mark the frequency where the frequency-domain peak is located as the peak frequency, and generate a peak frequency sequence according to all peak frequencies.

[0025] Further, calculate the order error of the high-order natural frequency through the following formula:

[0026]

[0027] Among them, σ n is the order error of the high-order natural frequency w n ; w n is the high-order natural frequency; n is the theoretical order corresponding to the high-order natural frequency; w 1 is the first-order natural frequency.

[0028] Furthermore, calculating and generating the tension of the ground wire according to the first-order natural frequency, each target peak frequency, the theoretical order corresponding to each target peak frequency, the span of the ground wire, the tension of the ground wire, and the mass per unit length of the ground wire includes:

[0029] Calculating the tension corresponding to each target peak frequency through the following formula:

[0030]

[0031] Among them, T n is the tension corresponding to the target peak frequency w′ n ; L is the span of the ground wire; m is the mass per unit length of the ground wire; n′ is the theoretical order corresponding to the target peak frequency w′ n ; π is the pi;

[0032] Performing an average calculation on the tensions corresponding to each target peak frequency to generate the tension of the ground wire.

[0033] Based on the above method item embodiments, the present invention correspondingly provides device item embodiments.

[0034] An embodiment of the present invention provides a device for calculating the tension of a ground wire of an overhead transmission line, including: a ground wire data acquisition module, an acceleration spectrogram generation module, a peak frequency sequence generation module, a high-order natural frequency generation module, a theoretical order generation module, a target peak frequency generation module, and a ground wire tension calculation module;

[0035] The ground wire data acquisition module is used to acquire the vibration acceleration signal, span, tension, and mass per unit length of the ground wire;

[0036] The acceleration spectrogram generation module is used to perform a transformation process on the vibration acceleration signal of the ground wire to generate an acceleration spectrogram;

[0037] The peak frequency sequence generation module is used to extract all peak frequencies according to the acceleration spectrogram to generate a peak frequency sequence;

[0038] The high-order natural frequency generation module is configured to record the peak frequency with the lowest frequency in the peak frequency sequence as the first-order natural frequency, and record the other peak frequencies in the peak frequency sequence except the first-order natural frequency as high-order natural frequencies;

[0039] The theoretical order generation module is configured to calculate the ratio of each high-order natural frequency to the first-order natural frequency in sequence, and generate the theoretical order corresponding to the high-order natural frequency;

[0040] The target peak frequency generation module is configured to calculate the order error of each high-order natural frequency according to the first-order natural frequency, the high-order natural frequency, and the theoretical order corresponding to the high-order natural frequency; and use the high-order natural frequency whose order error does not exceed a preset error threshold as the target peak frequency;

[0041] The conductor tension calculation module is configured to calculate and generate the conductor tension according to the first-order natural frequency, each target peak frequency, the theoretical order corresponding to each target peak frequency, the span of the conductor, the tension of the conductor, and the mass per unit length of the conductor.

[0042] Further, for the conductor tension calculation device of the overhead transmission line, the acceleration spectrogram generation module transforms the vibration acceleration signal of the conductor to generate an acceleration spectrogram, including:

[0043] Performing modal decomposition on the vibration acceleration signal of the conductor to generate a plurality of modal components;

[0044] Calculating the correlation coefficients between the modal components, and recording the modal components whose correlation coefficients with other modal components do not exceed a preset threshold as noise modal components;

[0045] Performing signal reconstruction on the modal components except the noise modal components to generate a reconstructed vibration acceleration signal;

[0046] Performing Fourier transform on the reconstructed vibration acceleration signal to generate an acceleration spectrogram.

[0047] Based on the above method item embodiments, the present invention correspondingly provides an electronic device item embodiment.

[0048] An embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it can implement the conductor tension calculation method for the overhead transmission line described in any one of the above method item embodiments.

[0049] Based on the above method item embodiments, the present invention correspondingly provides a storage medium item embodiment.

[0050] An embodiment of the present invention provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, it can implement the conductor tension calculation method for overhead transmission lines described in any one of the above method embodiments.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] An embodiment of the present invention provides a method, device, electronic device, and storage medium for calculating the tension of conductors in overhead transmission lines. Based on the vibration characteristics of the conductors, by obtaining vibration acceleration signals, span, tension, and mass per unit length, the vibration acceleration signals are transformed to generate an acceleration frequency spectrum diagram, and the peak frequencies therein are extracted. By defining the lowest frequency as the first natural frequency and calculating the ratio of the higher-order natural frequency to the first-order frequency to generate the theoretical order, the higher-order frequencies with order errors within a preset range are further selected as the target peak frequencies. Finally, using the first-order frequency, the target peak frequencies, and their theoretical orders, combined with the structural parameters of the conductors, the conductor tension is calculated, realizing efficient and accurate tension measurement.

[0053] The present invention extracts the natural frequencies in the conductors through vibration acceleration signals and matches them with the theoretical orders, and calculates the tension of the conductors by using the inherent relationship between the natural frequencies and the tension of the conductors, thereby avoiding the interference of external environmental changes, solving the calculation errors caused by the large influence of environmental conditions in the prior art, and improving the accuracy of conductor tension calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a schematic flowchart of a method for calculating the tension of conductors in an overhead transmission line provided by an embodiment of the present invention.

[0055] Figure 2 is an acceleration frequency spectrum diagram of a conductor provided by an embodiment of the present invention.

[0056] Figure 3 is a schematic diagram of the force analysis of a conductor provided by an embodiment of the present invention.

[0057] Figure 4 is a schematic structural diagram of a device for calculating the tension of conductors in an overhead transmission line provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0059] As Figure 1 shown, an embodiment of the present invention provides a method for calculating the tension of the conductor and ground wire of an overhead transmission line, which at least includes the following steps:

[0060] Step S1: Obtain the vibration acceleration signal, span, tension, and mass per unit length of the conductor and ground wire;

[0061] In a preferred embodiment, a vibration acceleration sensor is provided on the surface of the conductor and ground wire. The obtaining of the vibration acceleration signal of the conductor and ground wire includes:

[0062] Collecting the vibration acceleration data of the vibration acceleration sensor after an impact hammer strikes the conductor and ground wire at a preset position with a preset force to obtain the vibration acceleration signal of the conductor and ground wire.

[0063] Step S2: Perform transformation processing on the vibration acceleration signal of the conductor and ground wire to generate an acceleration frequency spectrum diagram;

[0064] As Figure 2 shown, in a preferred embodiment, the performing transformation processing on the vibration acceleration signal of the conductor and ground wire to generate an acceleration frequency spectrum diagram includes:

[0065] Performing modal decomposition on the vibration acceleration signal of the conductor and ground wire to generate several modal components;

[0066] Calculating the correlation coefficients between the modal components, and recording the modal components whose correlation coefficients with other modal components do not exceed a preset threshold as noise modal components;

[0067] Performing signal reconstruction on the modal components except the noise modal components to generate a reconstructed vibration acceleration signal;

[0068] Performing Fourier transform on the reconstructed vibration acceleration signal to generate an acceleration frequency spectrum diagram.

[0069] Specifically, the vibration acceleration signal of the ground wire is decomposed by mode. By using the empirical mode decomposition (EMD) or ensemble empirical mode decomposition (EEMD) method, the original signal is decomposed into several mode components with different characteristic frequencies, and each mode component reflects different frequency components of the vibration signal. Subsequently, the correlation coefficients between the mode components are calculated to quantify the similarity between them. The mode components whose correlation coefficients with other mode components do not exceed a preset threshold are marked as noise mode components, and these noise mode components usually reflect the interference characteristics of measurement errors or environmental noise. By removing the noise mode components, signal reconstruction is performed on the remaining effective mode components, so as to generate a reconstructed vibration acceleration signal closer to the actual vibration characteristics of the ground wire. Finally, the reconstructed vibration acceleration signal is processed by fast Fourier transform (FFT) and converted into frequency-domain data to generate an acceleration spectrogram. This spectrogram clearly shows the frequency distribution characteristics of the ground wire vibration signal, providing a reliable frequency-domain basis for the subsequent extraction of natural frequencies and tension calculation.

[0070] Step S3: According to the acceleration spectrogram, extract all peak frequencies to generate a peak frequency sequence;

[0071] In a preferred embodiment, the extracting all peak frequencies according to the acceleration spectrogram to generate a peak frequency sequence includes:

[0072] Determine the frequency-domain peaks in the acceleration spectrogram through the following formula:

[0073]

[0074] where a is the acceleration spectrum amplitude; f is the frequency;

[0075] Record the frequency where the frequency-domain peak is located as the peak frequency, and generate a peak frequency sequence according to all peak frequencies.

[0076] Step S4: Denote the peak frequency with the lowest frequency in the peak frequency sequence as the first-order natural frequency, and denote the other peak frequencies in the peak frequency sequence except the first-order natural frequency as the higher-order natural frequencies;

[0077] Step S5: Calculate the ratio of each higher-order natural frequency to the first-order natural frequency in turn to generate the theoretical order corresponding to the higher-order natural frequency;

[0078] It should be explained here that the following is the theoretical derivation for generating the theoretical order corresponding to the higher-order natural frequency:

[0079] Such as Figure 3As shown in the figure, Step 1: Study on the vibration characteristics of the ground wire. The vibration of the ground wire is generally approximated to the vibration of a string. By performing a dynamic analysis on the overhead ground wire, the mechanical and moment balance expressions for the vibration of the ground wire are obtained:

[0080]

[0081] Among them, m is the mass per unit length, with the unit of kg / m; Q c is the shear force, with the unit of N; M is the bending moment, with the unit of N;

[0082] Step 2: Simplify the mechanical and moment balance expressions. The relationship between the bending moment and the deflection of the beam is Substitute it into Equation (2) for simplification, and then use the method of separation of variables to solve. Set the solution as y = U(x)V(t), and we can get:

[0083]

[0084] Among them, EI is the stiffness of the ground wire; U(x) is the (main) vibration mode function; V(t) is the time-related function, which describes the change of each mode with time;

[0085] Since the left side of the equation is only a function of x and the right side is only a function of t, for the equation to hold, both sides must be equal to a constant. Let this constant be w 2 , then Equation (3) can be simplified to

[0086]

[0087] Step 3: Substitute the boundary conditions to determine the state equation of the ground wire vibration. Since both ends of the ground wire are fixed, the boundary conditions are shown as the following equations:

[0088]

[0089] Substitute Equation (5) into Equation (4), and the expression for the natural frequency of the ground wire vibration can be obtained:

[0090]

[0091] Among them, L is the span, with the unit of m

[0092] Step 4: Simplified analysis of the natural frequency of the ground wire. Considering the length of the micro-segment of the ground wire, its stiffness cannot be ignored. When the length of the ground wire is several hundred meters, it can be equivalent to a flexible rope, and the stiffness of the ground wire can be ignored. Therefore, Equation (6) can be simplified to:

[0093]

[0094] Since the tension, length, and mass per unit length of the overhead line are constant, Equation (7) is a constant Ψ. That is, the nth-order vibration frequency is n times the first-order frequency, and the difference between two adjacent natural frequencies is the first-order vibration frequency.

[0095] Step S6: Calculate the order error of each high-order natural frequency based on the first-order natural frequency, high-order natural frequencies, and the theoretical order numbers corresponding to the high-order natural frequencies; regard the high-order natural frequencies with order errors not exceeding the preset error threshold as the target peak frequencies.

[0096] In a preferred embodiment, the order error of the high-order natural frequency is calculated by the following formula:

[0097]

[0098] where σ n is the order error of the high-order natural frequency w n ; w n is the high-order natural frequency; n is the theoretical order number corresponding to the high-order natural frequency; w 1 is the first-order natural frequency. Specifically, if the calculated order error is less than or equal to ±5%, it is considered that the order error is acceptable.

[0099] Step S7: Calculate and generate the tension of the ground wire based on the first-order natural frequency, each target peak frequency, the theoretical order numbers corresponding to each target peak frequency, the span of the ground wire, the tension of the ground wire, and the mass per unit length of the ground wire.

[0100] In a preferred embodiment, calculating and generating the tension of the ground wire based on the first-order natural frequency, each target peak frequency, the theoretical order numbers corresponding to each target peak frequency, the span of the ground wire, the tension of the ground wire, and the mass per unit length of the ground wire includes:

[0101] Calculate the tension corresponding to each target peak frequency by the following formula:

[0102]

[0103] where T n is the tension corresponding to the target peak frequency w' n ; L is the span of the ground wire; m is the mass per unit length of the ground wire; n' is the theoretical order number corresponding to the target peak frequency w' n ; π is the pi.

[0104] Perform an average calculation on the tensions corresponding to each target peak frequency to generate the tension of the ground wire.

[0105] Based on the above method embodiment, the present invention correspondingly provides a device embodiment.

[0106] AsFigure 4 As shown in the figure, an embodiment of the present invention provides a device for calculating the tension of the conductor and ground wire of an overhead transmission line, including: a conductor and ground wire data acquisition module, an acceleration spectrogram generation module, a peak frequency sequence generation module, a high-order natural frequency generation module, a theoretical order generation module, a target peak frequency generation module, and a conductor and ground wire tension calculation module;

[0107] The conductor and ground wire data acquisition module is used to acquire the vibration acceleration signal, span, tension, and mass per unit length of the conductor and ground wire;

[0108] The acceleration spectrogram generation module is used to perform transformation processing on the vibration acceleration signal of the conductor and ground wire to generate an acceleration spectrogram;

[0109] The peak frequency sequence generation module is used to extract all peak frequencies according to the acceleration spectrogram to generate a peak frequency sequence;

[0110] The high-order natural frequency generation module is used to record the peak frequency with the lowest frequency in the peak frequency sequence as the first-order natural frequency, and record the other peak frequencies in the peak frequency sequence except the first-order natural frequency as high-order natural frequencies;

[0111] The theoretical order generation module is used to calculate the ratio of each high-order natural frequency to the first-order natural frequency in turn to generate the theoretical order corresponding to the high-order natural frequency;

[0112] The target peak frequency generation module is used to calculate the order error of each high-order natural frequency according to the first-order natural frequency, high-order natural frequencies, and the theoretical order corresponding to the high-order natural frequency; and use the high-order natural frequency with the order error not exceeding the preset error threshold as the target peak frequency;

[0113] The conductor and ground wire tension calculation module is used to calculate and generate the conductor and ground wire tension according to the first-order natural frequency, each target peak frequency, the theoretical order corresponding to each target peak frequency, the span of the conductor and ground wire, the tension of the conductor and ground wire, and the mass per unit length of the conductor and ground wire.

[0114] In a preferred embodiment, for the device for calculating the tension of the conductor and ground wire of the overhead transmission line, the acceleration spectrogram generation module, which performs transformation processing on the vibration acceleration signal of the conductor and ground wire to generate an acceleration spectrogram, includes:

[0115] Performing modal decomposition on the vibration acceleration signal of the conductor and ground wire to generate a number of modal components;

[0116] Calculating the correlation coefficients between the modal components, and recording the modal component whose correlation coefficients with other modal components do not exceed the preset threshold as the noise modal component;

[0117] Reconstruct the signal of the modal components except the noise modal component to generate a reconstructed vibration acceleration signal;

[0118] Perform Fourier transform on the reconstructed vibration acceleration signal to generate an acceleration spectrogram.

[0119] It should be noted that the embodiments of the device described above correspond to the above embodiments of the present invention and can implement the calculation method of the conductor and ground wire tension of the overhead transmission line described in any one of the above of the present invention. In addition, the embodiments of the above device are merely illustrative. The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement without creative work.

[0120] Based on the above method embodiment of the present invention, a corresponding embodiment of an electronic device is provided.

[0121] An embodiment of the present invention provides an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the calculation method of the conductor and ground wire tension of the overhead transmission line described in any one of the present invention, or when the processor executes the computer program, it implements the functions of each module in the above device embodiments.

[0122] Exemplarily, the computer program can be divided into one or more modules. The one or more modules are stored in the memory and executed by the processor to complete the present invention. The one or more modules can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the terminal device.

[0123] The terminal device can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory.

[0124] The so-called processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the terminal device and connects various parts of the entire terminal device through various interfaces and lines.

[0125] The memory can be used to store the computer program and / or modules. The processor realizes various functions of the terminal device by running or executing the computer program and / or modules stored in the memory, and by calling the data stored in the memory. The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include high-speed random access memory, and can also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash device, or other volatile solid-state storage devices.

[0126] Based on the above method item embodiments, the present invention correspondingly provides storage medium item embodiments;

[0127] Another embodiment of the present invention provides a storage medium. The storage medium includes a stored computer program. When the computer program runs, it controls the device where the storage medium is located to execute the method for calculating the tension of the ground wire of any overhead transmission line in the present invention.

[0128] Among them, the above storage medium is a computer-readable storage medium, and the computer program includes computer program code, which can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0129] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0130] The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A method for calculating the tension of a ground conductor of an overhead transmission line, characterized in that: include: Obtain the vibration acceleration signal, span, tension and mass per unit length of the ground wire; The vibration acceleration signal of the ground wire is transformed and processed to generate an acceleration spectrum diagram; According to the acceleration spectrum, all peak frequencies are extracted to generate a peak frequency sequence; The lowest peak frequency in the peak frequency sequence is recorded as the first-order natural frequency, and the other peak frequencies in the peak frequency sequence except the first-order natural frequency are recorded as high-order natural frequencies; The ratio of each higher-order natural frequency to the first-order natural frequency is calculated in turn to generate the theoretical order corresponding to the higher-order natural frequency; According to the first-order natural frequency, the high-order natural frequency and the theoretical order corresponding to the high-order natural frequency, the order error of each high-order natural frequency is calculated; the high-order natural frequency whose order error does not exceed a preset error threshold is taken as the target peak frequency; The tension of the ground wire is calculated and generated according to the first-order natural frequency, each target peak frequency, the theoretical order corresponding to each target peak frequency, the span of the ground wire, the tension of the ground wire and the mass per unit length of the ground wire.

2. The method for calculating the tension of the ground conductor of an overhead power transmission line according to claim 1, characterized in that: A vibration acceleration sensor is disposed on the surface of the ground wire, and obtaining a vibration acceleration signal of the ground wire includes: The vibration acceleration data of the vibration acceleration sensor is collected after the impact hammer strikes the preset position of the ground wire with a preset force to obtain a vibration acceleration signal of the ground wire.

3. The method for calculating the tension of the ground conductor of an overhead power transmission line according to claim 2, characterized in that: The step of transforming the vibration acceleration signal of the ground wire to generate an acceleration spectrum diagram includes: Perform modal decomposition on the vibration acceleration signal of the ground wire to generate several modal components; Calculate the correlation coefficients between the modal components, and record the modal components whose correlation coefficients with other modal components do not exceed a preset threshold as noise modal components; Reconstructing the signals of the modal components except the noise modal components to generate a reconstructed vibration acceleration signal; The reconstructed vibration acceleration signal is subjected to Fourier transform to generate an acceleration spectrum.

4. The method for calculating the tension of the ground conductor of an overhead power transmission line according to claim 3, characterized in that: The method of extracting all peak frequencies according to the acceleration spectrum diagram and generating a peak frequency sequence includes: The frequency domain peak value in the acceleration spectrum is determined by the following formula: Where, a is the acceleration spectrum amplitude; f is the frequency; The frequency where the frequency domain peak is located is recorded as the peak frequency, and a peak frequency sequence is generated based on all the peak frequencies.

5. The method for calculating the tension of the ground conductor of an overhead power transmission line according to claim 4, characterized in that: The order error of higher-order natural frequencies is calculated by the following formula: Among them, σ n is the high-order natural frequency w n The order error of w n is the higher-order natural frequency; n is the theoretical order corresponding to the higher-order natural frequency; w1 is the first-order natural frequency.

6. The method for calculating the tension of the ground conductor of an overhead power transmission line according to claim 5, characterized in that: The method of calculating and generating the tension of the ground wire according to the first-order natural frequency, each target peak frequency, the theoretical order corresponding to each target peak frequency, the pitch of the ground wire, the tension of the ground wire and the mass per unit length of the ground wire comprises: The tension corresponding to each target peak frequency is calculated using the following formula: Among them, T n is the target peak frequency w′ n The corresponding tension; L is the spacing of the ground wire; m is the mass per unit length of the ground wire; n' is the target peak frequency w' n The corresponding theoretical order; π is the circumference of a circle; The tension corresponding to each target peak frequency is averaged to generate the ground wire tension.

7. A device for calculating the tension of a ground conductor of an overhead power transmission line, characterized in that: include: Ground wire data acquisition module, acceleration spectrum generation module, peak frequency sequence generation module, high-order natural frequency generation module, theoretical order generation module, target peak frequency generation module and ground wire tension calculation module; The ground wire data acquisition module is used to obtain the vibration acceleration signal, gear spacing, tension and unit length mass of the ground wire; The acceleration spectrum diagram generating module is used to transform the vibration acceleration signal of the ground wire to generate an acceleration spectrum diagram; The peak frequency sequence generation module is used to extract all peak frequencies according to the acceleration spectrum diagram and generate a peak frequency sequence; The high-order natural frequency generation module is used to record the lowest peak frequency in the peak frequency sequence as the first-order natural frequency, and record the other peak frequencies in the peak frequency sequence except the first-order natural frequency as the high-order natural frequencies; The theoretical order generation module is used to calculate the ratio of each high-order natural frequency to the first-order natural frequency in turn, and generate the theoretical order corresponding to the high-order natural frequency; The target peak frequency generation module is used to calculate the order error of each high-order natural frequency according to the first-order natural frequency, the high-order natural frequency and the theoretical order corresponding to the high-order natural frequency; and take the high-order natural frequency whose order error does not exceed a preset error threshold as the target peak frequency; The ground wire tension calculation module is used to calculate and generate the ground wire tension according to the first-order natural frequency, each target peak frequency, the theoretical order corresponding to each target peak frequency, the ground wire spacing, the ground wire tension and the unit length mass of the ground wire.

8. The device for calculating the tension of the ground conductor of an overhead power transmission line according to claim 7, characterized in that: The acceleration spectrum diagram generation module transforms the vibration acceleration signal of the ground wire to generate the acceleration spectrum diagram, including: Perform modal decomposition on the vibration acceleration signal of the ground wire to generate several modal components; Calculate the correlation coefficients between the modal components, and record the modal components whose correlation coefficients with other modal components do not exceed a preset threshold as noise modal components; Reconstructing the signals of the modal components except the noise modal components to generate a reconstructed vibration acceleration signal; The reconstructed vibration acceleration signal is subjected to Fourier transform to generate an acceleration spectrum.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for calculating the tension of the ground conductor of the overhead transmission line according to any one of claims 1 to 6 can be implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it can implement the method for calculating the tension of the ground conductor of an overhead transmission line as described in any one of claims 1 to 6.

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