Overhead conductor rigidity correction method and device, terminal equipment and storage medium

Abstract

The invention discloses an overhead conductor rigidity correction method and device, terminal equipment and a storage medium. The method comprises the following steps: acquiring geometric parameters and vibration characteristic parameters of a to-be-corrected overhead conductor at a first preset temperature; calculating a first conductor stiffness value at a first preset temperature according to the geometric parameter and the vibration characteristic parameter; calculating a second wire rigidity value at a second preset temperature according to the first wire rigidity value, the first preset temperature and the second preset temperature; according to the first conductor rigidity value and the second conductor rigidity value, calculating a conductor rigidity change value after the to-be-corrected overhead conductor is changed from the first preset temperature to the second preset temperature; and correcting the second wire stiffness value according to the wire stiffness change value. Therefore, by implementing the method, the problem of inaccurate wire rigidity calculation and correction caused by the fact that a wire rigidity calculation formula in the prior art does not consider the influence of temperature change and vibration characteristics on wire rigidity calculation can be solved.

Description

Technical Field

[0001] The present invention relates to the field of power grid safety technology, and in particular to an overhead conductor stiffness correction method, device, terminal equipment and storage medium. Background Art

[0002] After installation, power lines are exposed to the external climatic environment for extended periods. Overhead lines, in particular, carrying electricity, must withstand not only static loads but also dynamic loads caused by vibration and wind. Consequently, overhead lines are prone to cracks and strand breakage, impacting the safe operation of the power grid. Steel-core aluminum stranded wire, a common conductor used in overhead transmission lines, has a complex strand structure. Therefore, its bending resistance is characterized by its nominal bending stiffness, or equivalent bending stiffness of the overhead conductor. Fatigue-induced changes in the equivalent bending stiffness near the conductor suspension point and fitting outlet amplify vibration levels at these locations, further impacting the conductor's sag and air gap.

[0003] At present, the equivalent bending stiffness of overhead conductors is mainly calculated by general formulas, such as This formula is used for calculation; where R1 is the equivalent bending stiffness of the overhead conductor, n al is the number of aluminum strands, n st is the number of steel strands, d al is the diameter of the aluminum strand, d st is the diameter of the steel strand, E al is the elastic modulus of the aluminum strand, E st is the elastic modulus of the steel strand. However, this formula does not consider the nonlinear effects of temperature changes on the elastic modulus when calculating the equivalent bending stiffness of overhead conductors, nor does it couple the effects of the conductor's dynamic vibration characteristics (such as natural frequency) on conductor stiffness. This shows that this formula only applies under ideal conditions. In actual engineering, conductor stiffness is affected by the complex coupling of multiple factors such as temperature and frequency. The static calculation formula proposed above is difficult to account for the influence of these factors, resulting in inaccurate calculated conductor stiffness and an inability to ensure the safe and stable operation of the power grid. Summary of the Invention

[0004] The embodiments of the present invention provide a method, apparatus, terminal device and storage medium for correcting the stiffness of an overhead conductor, which can solve the problem that the existing conductor stiffness calculation formula does not take into account the influence of temperature changes and vibration characteristics on the conductor stiffness calculation, resulting in inaccurate conductor stiffness calculation and correction, and further making the calculated conductor stiffness difficult to assist the safe operation of the power grid.

[0005] An embodiment of the present invention provides a method for correcting the stiffness of an overhead conductor, comprising:

[0006] Acquire geometric parameters and vibration characteristic parameters of the overhead wire to be corrected at a first preset temperature; wherein the geometric parameters include: span and mass per unit length, and the vibration characteristic parameters include: acceleration data and wire tension;

[0007] Calculating a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters;

[0008] Calculating a second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature;

[0009] Calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature;

[0010] The second wire stiffness value is corrected according to the wire stiffness change value.

[0011] Furthermore, the calculating of a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters includes:

[0012] The first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated according to the following formula:

[0013]

[0014] Wherein, t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia; w1 represents the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature, and the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature is obtained by Fourier transforming the acceleration data; L represents the span; m represents the mass per unit length; T represents the conductor tension.

[0015] Furthermore, the calculating of a second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature includes:

[0016] The second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated according to the following formula:

[0017]

[0018] Wherein, t2 represents the second preset temperature; represents the elastic modulus of the overhead wire to be corrected at a second preset temperature; represents the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature; η represents the temperature coefficient; t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; It represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia.

[0019] Furthermore, the calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature includes:

[0020] The change in conductor stiffness of the overhead conductor to be corrected is calculated using the following formula:

[0021]

[0022] Wherein, △(EI) represents the change value of the conductor stiffness of the overhead conductor to be corrected; Indicates the second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature; Indicates the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature.

[0023] Based on the above method embodiment, the present invention provides a corresponding device embodiment;

[0024] An embodiment of the present invention provides an overhead conductor stiffness correction device, comprising: a data acquisition module, a first conductor stiffness numerical calculation module, a second conductor stiffness numerical calculation module, a conductor stiffness change numerical calculation module, and a conductor stiffness numerical correction module;

[0025] The data acquisition module is used to obtain geometric parameters and vibration characteristic parameters of the overhead wire to be corrected at a first preset temperature; wherein the geometric parameters include: span and unit length mass, and the vibration characteristic parameters include: acceleration data and wire tension;

[0026] The first conductor stiffness value calculation module is used to calculate the first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters;

[0027] The second conductor stiffness value calculation module is used to calculate the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature based on the first conductor stiffness value, the first preset temperature and the second preset temperature;

[0028] The conductor stiffness change value calculation module is used to calculate the conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature based on the first conductor stiffness value and the second conductor stiffness value;

[0029] The wire stiffness value correction module is used to correct the second wire stiffness value according to the wire stiffness change value.

[0030] Furthermore, the calculating of a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters includes:

[0031] The first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated according to the following formula:

[0032]

[0033] Wherein, t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia; w1 represents the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature, and the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature is obtained by Fourier transforming the acceleration data; L represents the span; m represents the mass per unit length; T represents the conductor tension.

[0034] Furthermore, the calculating of a second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature includes:

[0035] The second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated according to the following formula:

[0036]

[0037] Wherein, t2 represents the second preset temperature; represents the elastic modulus of the overhead wire to be corrected at a second preset temperature; represents the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature; η represents the temperature coefficient; t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; It represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia.

[0038] Furthermore, the calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature includes:

[0039] The change in conductor stiffness of the overhead conductor to be corrected is calculated using the following formula:

[0040]

[0041] Wherein, △(EI) represents the change value of the conductor stiffness of the overhead conductor to be corrected; Indicates the second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature; Indicates the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature.

[0042] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the overhead wire stiffness correction method described in the above-mentioned embodiment of the invention.

[0043] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the overhead wire stiffness correction method described in the above-mentioned embodiment of the invention.

[0044] The following beneficial effects are achieved by implementing the present invention:

[0045] The present invention provides a method, apparatus, terminal device, and storage medium for correcting the stiffness of an overhead conductor. The method obtains geometric parameters and vibration characteristic parameters of the overhead conductor to be corrected at a first preset temperature, and then calculates a first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature based on the geometric parameters and vibration characteristic parameters, taking into account the vibration characteristic parameters and temperature. Furthermore, a second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature is calculated based on the first conductor stiffness value, the first preset temperature, and the second preset temperature. Finally, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from the first preset temperature to the second preset temperature is calculated, and the second conductor stiffness value is corrected based on the conductor stiffness change value. This method solves the problem of inaccurate conductor stiffness calculation and correction caused by the prior art conductor stiffness calculation formula not considering the influence of temperature change and vibration characteristics on conductor stiffness calculation, which in turn makes the calculated conductor stiffness difficult to assist in the safe operation of the power grid. The method realizes the calculation of the conductor stiffness change value considering temperature change and vibration characteristics, and corrects the second conductor stiffness value based on the calculated conductor stiffness change value, thereby improving the accuracy of the correction and ensuring the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The figure is a flow chart of a method for correcting the stiffness of an overhead conductor provided in one embodiment of the present invention.

[0047] Figure 2 Schematic diagram of an overhead conductor experimental platform provided in one embodiment of the present invention.

[0048] Figure 3 It is a schematic diagram of overhead conductor force analysis provided by one embodiment of the present invention.

[0049] Figure 4 It is a structural schematic diagram of an overhead conductor stiffness correction device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] See also Figure 1In order to solve the problem that the existing conductor stiffness calculation formula does not consider the influence of temperature change and vibration characteristics on the conductor stiffness calculation, resulting in inaccurate conductor stiffness calculation and correction, and further resulting in the calculated conductor stiffness being unable to assist the safe operation of the power grid, an embodiment of the present invention provides a method for correcting the stiffness of an overhead conductor, including:

[0052] Step S1: obtaining geometric parameters and vibration characteristic parameters of the overhead wire to be corrected at a first preset temperature; wherein the geometric parameters include: span and mass per unit length; and the vibration characteristic parameters include: acceleration data and wire tension;

[0053] Step S2: calculating a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature according to the geometric parameters and the vibration characteristic parameters;

[0054] Step S3: calculating a second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature;

[0055] Step S4: calculating a change in conductor stiffness of the overhead conductor to be corrected after the temperature changes from a first preset temperature to a second preset temperature based on the first conductor stiffness value and the second conductor stiffness value;

[0056] Step S5: correcting the second wire stiffness value according to the wire stiffness change value.

[0057] For step S1, during actual use, the first preset temperature can be obtained through a thermocouple arranged on the overhead wire to be corrected, the wire tension can be obtained through a tension sensor arranged on the overhead wire to be corrected, the acceleration data can be obtained through an acceleration sensor arranged on the overhead wire to be corrected, and the span and unit length mass of the overhead wire to be corrected can be determined through the fixed geometric parameters of the overhead wire to be corrected.

[0058] In addition, the first preset temperature and vibration characteristic parameters of the present invention can also be obtained by building an experimental platform, such as Figure 2 As shown, an overhead wire to be corrected is selected as the overhead wire to be corrected (the overhead wire to be corrected is Figure 2The wire is then clamped and a high-precision accelerometer is installed on the overhead conductor to be corrected (e.g., a medium gray line segment). An excitation point is selected at the intersection of the suspension clamp and the overhead conductor to be corrected. A high-precision accelerometer is installed with electrical tape at the excitation point, 89 mm from the side of the suspension clamp outlet. The accelerometer is used to detect the acceleration data of the bottom line at the suspension clamp during free-attenuation vibration. The installed accelerometer is a vibration accelerometer with an accuracy of 10k. A winch is installed at one end of the overhead conductor to be corrected, and a tension sensor is installed on one side of the winch. The tension sensor is used to obtain the tension of the conductor when the winch pulls the overhead conductor to be corrected. Thermocouples are also required to be laid on the surface of the overhead conductor to be corrected. The accuracy of the thermocouples is ±0.5°C. When laying the thermocouples, it is necessary to ensure that the excitation point and the temperature measurement point are in the same range. The two sides of the overhead conductor to be corrected are connected to a large current generator through tension clamps. The large current generator applies a current of rated current carrying capacity to the overhead conductor to be corrected, and continuously energizes the conductor to be corrected so that the temperature of the conductor reaches a steady state (the steady state means that the temperature fluctuation of the conductor to be corrected is ≤1°C / 10 minutes). The steady-state temperature obtained at this time can be used as the initial monitoring temperature point, that is, as the above-mentioned first preset temperature.

[0059] It should be noted that during the experiment, acceleration data can be obtained by tapping. Specifically, an impact hammer is used to perform instantaneous vertical tapping at the excitation point at the bottom of the suspension clamp, ensuring that the impact force amplitude of each excitation is stable within the range of 50±5N.

[0060] Preferably, after acquiring the acceleration data, a Fast Fourier Transform (FFT) can be performed on the acceleration data to convert the acceleration data (time domain signal) into a frequency domain signal through the Fourier transform; wherein, in the frequency domain signal, the horizontal axis represents the frequency and the vertical axis represents the amplitude of the corresponding frequency component. The ground wire vibration frequency domain signal obtained by the FFT conversion is analyzed to find the peak point with the largest amplitude. The frequency value corresponding to the peak point is recorded. This frequency value is the first-order natural frequency of the overhead wire to be corrected.

[0061] For step S2, the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated based on the first-order natural frequency and conductor tension obtained after processing the span, unit length mass, and acceleration data measured at the first preset temperature (such as steady-state temperature).

[0062] In a preferred embodiment, the calculating of a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters includes:

[0063] The first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated according to the following formula:

[0064]

[0065] Wherein, t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia; w1 represents the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature, and the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature is obtained by Fourier transforming the acceleration data; L represents the span; m represents the mass per unit length; T represents the conductor tension.

[0066] It should be noted that the above formula (1) is obtained through a series of analyses of the stress on overhead conductors.

[0067] Specifically, such as Figure 3 The figure below is a schematic diagram of the stress analysis of an overhead conductor. Figure 3 The overhead wire in (a) is subjected to force analysis in the horizontal direction (x direction) and the vertical direction (y direction), and the results are: Figure 3 (b) Overhead conductor analysis diagram shown. Figure 3 (b) The overhead conductor force formula shown in formula (2) can be obtained.

[0068]

[0069] Among them, ∑y is the resultant force in the vertical direction; ∑M x is the resultant moment in the horizontal direction; m is the mass per unit length, in kilograms per meter; y represents the vertical direction; Q is the shear force, in Newtons; dx is the partial infinitesimal element of the overhead conductor; T is the tension of the overhead conductor, in Newtons; M is the bending moment, in Newtons; α and β are the angles between the bending infinitesimal element of the conductor and the horizontal direction, which are used to assist in calculations.

[0070] At the same time, the relationship between the bending moment and deflection of the beam is:

[0071]

[0072] Where EI represents the stiffness of the overhead conductor.

[0073] Substitute equation (3) into equation (2) to simplify it, and then use the separation of variables method to solve it. Set the solution to y = U(x)V(t), and we can get:

[0074]

[0075] Where EI is the stiffness of the overhead conductor; U(x) is the (main) vibration mode function; V(t) is a time-dependent function that describes the change of each mode over time. Since the ends of the overhead conductor are fixed, the boundary conditions of the overhead conductor can be obtained as follows:

[0076]

[0077] Substituting formula (5) and formula (3) into formula (2), we can obtain the expression (6) of the natural frequency of the overhead conductor modal order.

[0078]

[0079] Where n is the modal order. When n is 1, w1 is the first-order natural frequency of the overhead conductor. L is the span in meters.

[0080] Taking the modal order in formula (6) as 1, the relationship expression between the first-order natural frequency and the conductor stiffness can be obtained (7).

[0081]

[0082] Convert EI in the above formula (7) into It is used to represent the first conductor stiffness value at the first preset temperature t1. When the geometric parameters and vibration characteristic parameters measured at the first preset temperature t1 are substituted into formula (6), formula (7) can be converted into formula (1).

[0083] For step S3, after the first conductor stiffness value is calculated according to formula (1), in actual application, a second predicted temperature measured within a period of time after the first preset temperature measurement moment is obtained. At this time, the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated based on the first preset temperature, the second preset temperature and the first conductor stiffness value.

[0084] Preferably, if used in an experimental platform, the current of the overhead conductor can be regulated by a large current generator, thereby changing the temperature of the overhead conductor from a first preset temperature to a second preset temperature.

[0085] In a preferred embodiment, the calculating of the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature includes:

[0086] The second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated according to the following formula:

[0087]

[0088] Wherein, t2 represents the second preset temperature; represents the elastic modulus of the overhead wire to be corrected at a second preset temperature; represents the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature; η represents the temperature coefficient; t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; It represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia.

[0089] It should be noted that the above formula (8) is obtained after a series of analyses of the stiffness values ​​of overhead conductors at different temperatures based on material mechanics.

[0090] Specifically, temperature changes affect the stiffness of overhead conductors by simultaneously affecting their elastic modulus E and moment of inertia I. However, temperature typically affects the material's elastic modulus, while the impact on the moment of inertia is typically smaller. This is particularly true for metal materials used in overhead conductors, where the impact is minimal. This minor effect of temperature on the moment of inertia is not considered in this invention, which primarily focuses on correcting the effect of temperature on the elastic modulus. The strands of overhead conductors are made of a multi-material material, and the elastic modulus of the strands at temperature can be expressed as Equation (9).

[0091]

[0092] Among them, E t is the elastic modulus of the strand material of the overhead conductor at temperature t°C; s is the atomic spacing of the strand material; and F is the crystal bonding force in the strand material.

[0093] F in formula (9) is related to formula (10).

[0094]

[0095] Where F(s) is the crystal bonding force in the wire material; U(s) represents the potential energy between atoms of the aluminum wire strand; i is a constant; and P represents the magnitude of the interatomic attraction energy.

[0096] By taking the derivative of both ends of formula (9) with respect to temperature t, we can obtain formula (11).

[0097]

[0098] When the strands of an overhead conductor expand thermally, the distance between atoms also expands, which can be expressed as:

[0099] s=s0(1+αt); (12)

[0100] Where s0 represents the distance between aluminum atoms when the temperature is zero; α is the linear expansion coefficient, and its differential definition is shown in formula (12).

[0101]

[0102] Where η is the elastic modulus E t Temperature coefficient.

[0103] Substituting formula (13) into formula (12) yields formula (14).

[0104]

[0105] By integrating both ends of formula (14) simultaneously, we can obtain formula (15).

[0106] E t =E0(1-(i+3)αt);(15)

[0107] In formula (15), That is, formula (15) can be rewritten as formula (16), which is the relationship expression between temperature t and the elastic modulus of the overhead conductor.

[0108] E t =E0(1-ηt); (16)

[0109] Among them, E0 represents the elastic modulus of the overhead conductor at a temperature of 0°C. Depending on the material of the overhead conductor strands, E0, η, and α will vary. These parameters can be obtained by looking up a table based on the material of the overhead conductor.

[0110] Based on formula (16), the expression of the stiffness value of the overhead conductor at different temperatures can be obtained, as shown in formula (17).

[0111]

[0112] Then, formula (17) can be rewritten to obtain formula (8).

[0113] With respect to step S4, in a preferred embodiment, calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature, includes:

[0114] The change in conductor stiffness of the overhead conductor to be corrected is calculated using the following formula:

[0115]

[0116] Wherein, △(EI) represents the change value of the conductor stiffness of the overhead conductor to be corrected; Indicates the second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature; Indicates the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature.

[0117] In step S5, based on the calculated conductor stiffness change value, the second conductor stiffness value is corrected to restore it to the first conductor stiffness value. If correction is not possible, the overhead conductor to be corrected is considered to be replaced to ensure safe operation of the power grid.

[0118] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0119] like Figure 4 As shown, an embodiment of the present invention provides an overhead conductor stiffness correction device, comprising: a data acquisition module, a first conductor stiffness numerical calculation module, a second conductor stiffness numerical calculation module, a conductor stiffness change numerical calculation module, and a conductor stiffness numerical correction module;

[0120] The data acquisition module is used to obtain geometric parameters and vibration characteristic parameters of the overhead wire to be corrected at a first preset temperature; wherein the geometric parameters include: span and unit length mass, and the vibration characteristic parameters include: acceleration data and wire tension;

[0121] The first conductor stiffness value calculation module is used to calculate the first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters;

[0122] The second conductor stiffness value calculation module is used to calculate the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature based on the first conductor stiffness value, the first preset temperature and the second preset temperature;

[0123] The conductor stiffness change value calculation module is used to calculate the conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature based on the first conductor stiffness value and the second conductor stiffness value;

[0124] The wire stiffness value correction module is used to correct the second wire stiffness value according to the wire stiffness change value.

[0125] In a preferred embodiment, the calculating of a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters includes:

[0126] The first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated according to the following formula:

[0127]

[0128] Wherein, t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia; w1 represents the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature, and the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature is obtained by Fourier transforming the acceleration data; L represents the span; m represents the mass per unit length; T represents the conductor tension.

[0129] In a preferred embodiment, the calculating of the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature includes:

[0130] The second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated according to the following formula:

[0131]

[0132] Wherein, t2 represents the second preset temperature; represents the elastic modulus of the overhead wire to be corrected at a second preset temperature; represents the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature; η represents the temperature coefficient; t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; It represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia.

[0133] In a preferred embodiment, the calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature includes:

[0134] The change in conductor stiffness of the overhead conductor to be corrected is calculated using the following formula:

[0135]

[0136] Wherein, △(EI) represents the change value of the conductor stiffness of the overhead conductor to be corrected; Indicates the second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature; Indicates the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature.

[0137] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0138] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0139] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment.

[0140] An embodiment of the present invention provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements an overhead wire stiffness correction method as described in any one of the present inventions.

[0141] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0142] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, connecting various parts of the entire terminal device using various interfaces and lines.

[0143] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created based on the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0144] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0145] An embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program is running, the device where the storage medium is located is controlled to execute any one of the overhead conductor stiffness correction methods described in the present invention.

[0146] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, the steps of each of the above-mentioned method embodiments can be implemented. The computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0147] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for correcting the stiffness of an overhead conductor, characterized in that: include: Acquire geometric parameters and vibration characteristic parameters of the overhead wire to be corrected at a first preset temperature; wherein the geometric parameters include: span and mass per unit length, and the vibration characteristic parameters include: acceleration data and wire tension; Calculating a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters; Calculating a second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature based on the first conductor stiffness value, the first preset temperature, and the second preset temperature; Calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature; The second wire stiffness value is corrected according to the wire stiffness change value.

2. The method for correcting the stiffness of an overhead conductor according to claim 1, wherein: The calculating of a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature according to the geometric parameters and the vibration characteristic parameters includes: The first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated according to the following formula: Wherein, t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia; w1 represents the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature, and the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature is obtained by Fourier transforming the acceleration data; L represents the span; m represents the mass per unit length; T represents the conductor tension.

3. The method for correcting the stiffness of an overhead conductor according to claim 2, wherein: The calculating, based on the first conductor stiffness value, the first preset temperature, and the second preset temperature, of the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature includes: The second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated according to the following formula: Wherein, t2 represents the second preset temperature; represents the elastic modulus of the overhead wire to be corrected at a second preset temperature; represents the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature; η represents the temperature coefficient; t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; It represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia.

4. The method for correcting the stiffness of an overhead conductor according to claim 3, wherein: The calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature includes: The change in conductor stiffness of the overhead conductor to be corrected is calculated using the following formula: Wherein, △(EI) represents the change value of the conductor stiffness of the overhead conductor to be corrected; Indicates the second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature; Indicates the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature.

5. An overhead conductor stiffness correction device, characterized in that: include: A data acquisition module, a first wire stiffness numerical calculation module, a second wire stiffness numerical calculation module, a wire stiffness change numerical calculation module, and a wire stiffness numerical correction module; The data acquisition module is used to obtain geometric parameters and vibration characteristic parameters of the overhead wire to be corrected at a first preset temperature; wherein the geometric parameters include: span and unit length mass, and the vibration characteristic parameters include: acceleration data and wire tension; The first conductor stiffness value calculation module is used to calculate the first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature based on the geometric parameters and the vibration characteristic parameters; The second conductor stiffness value calculation module is used to calculate the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature based on the first conductor stiffness value, the first preset temperature and the second preset temperature; The conductor stiffness change value calculation module is used to calculate the conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature based on the first conductor stiffness value and the second conductor stiffness value; The wire stiffness value correction module is used to correct the second wire stiffness value according to the wire stiffness change value.

6. The overhead conductor stiffness correction device according to claim 5, characterized in that: The calculating of a first conductor stiffness value of the overhead conductor to be corrected at a first preset temperature according to the geometric parameters and the vibration characteristic parameters includes: The first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature is calculated according to the following formula: Wherein, t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia; w1 represents the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature, and the first-order natural frequency of the overhead conductor to be corrected at the first preset temperature is obtained by Fourier transforming the acceleration data; L represents the span; m represents the mass per unit length; T represents the conductor tension.

7. An overhead conductor stiffness correction device according to claim 6, characterized in that: The calculating, based on the first conductor stiffness value, the first preset temperature, and the second preset temperature, of the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature includes: The second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature is calculated according to the following formula: Wherein, t2 represents the second preset temperature; represents the elastic modulus of the overhead wire to be corrected at a second preset temperature; represents the second conductor stiffness value of the overhead conductor to be corrected at the second preset temperature; η represents the temperature coefficient; t1 represents the first preset temperature; represents the elastic modulus of the overhead wire to be corrected at a first preset temperature; It represents the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature; I represents the section moment of inertia.

8. The overhead conductor stiffness correction device according to claim 7, characterized in that: The calculating, based on the first conductor stiffness value and the second conductor stiffness value, a conductor stiffness change value of the overhead conductor to be corrected after the overhead conductor to be corrected changes from a first preset temperature to a second preset temperature includes: The change in conductor stiffness of the overhead conductor to be corrected is calculated using the following formula: Wherein, △(EI) represents the change value of the conductor stiffness of the overhead conductor to be corrected; Indicates the second conductor stiffness value of the overhead conductor to be corrected at a second preset temperature; Indicates the first conductor stiffness value of the overhead conductor to be corrected at the first preset temperature.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for correcting the stiffness of an overhead conductor according to any one of claims 1 to 4 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the overhead conductor stiffness correction method according to any one of claims 1 to 4.

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