DC Line Galloping Monitoring Method, Device, Storage Medium and Electronic Device

Abstract

The present application provides a method, device, storage medium and electronic device for monitoring the galloping of a DC line, which relates to the technical field of high voltage. Among them, the method includes: establishing a mapping relationship between the induced current of the ground wire and the galloping characteristics of the conductor according to the line structure parameters; monitoring the induced current of the ground wire through a current sensor; when a low-frequency induced current is detected, performing spectrum analysis on the detected low-frequency induced current to obtain at least one frequency component; based on at least one frequency component, judging the galloping condition of the conductor according to the established mapping relationship. The present application adopting the above solution can perceive the galloping situation of the conductor of the DC overhead line in real time and improve the digital level of the DC overhead transmission line.

Description

Technical Field

[0001] The present application relates to the technical field of high voltage, and particularly to a method and device for monitoring direct current line galloping, a storage medium, and an electronic device. Background Art

[0002] Icing galloping is an important disaster threatening the essential safety of transmission line equipment, and often occurs over a large area. Minor galloping can cause flashovers and tripping, while severe galloping can lead to various major power grid accidents such as damage to fittings and insulators, wire breakage, bolt loosening, and tower collapse. In addition, with the development of power grid construction, galloping accidents of overhead transmission lines occur very frequently.

[0003] The wide range of influence and great degree of damage of icing galloping on overhead transmission lines have prompted domestic and foreign scholars, institutions, and units to invest in the research in this field, and gradually formed a set of anti-galloping technology systems covering galloping mechanism, galloping characteristics, galloping monitoring, galloping prediction, and galloping protection.

[0004] Galloping monitoring is an important link in the anti-galloping system, and plays an important role in the research of galloping mechanism and characteristics, the verification of galloping prediction and protection effects, as well as the emergency disposal of galloping and the analysis of post-event causes. At present, galloping monitoring technologies mainly include wire contact galloping monitoring devices represented by displacement / acceleration sensors and Beidou positioning terminals, and non-contact optical galloping monitoring devices mainly based on video monitoring. However, the wire contact galloping monitoring devices need to be installed without power or through live working, are easy to wear, and are very inconvenient for operation and maintenance. Moreover, multiple sets of devices need to be deployed in large-span sections to monitor the galloping characteristics of different half-wave numbers, resulting in high comprehensive costs; while the non-contact optical galloping monitoring devices mainly based on video monitoring are often affected by bad weather during galloping and cannot well monitor the galloping characteristics of the wire. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems in the related art to some extent.

[0006] To this end, the first object of the present application is to propose a method for monitoring direct current line galloping, which solves the technical problems of poor monitoring effect under bad weather or inconvenient installation and operation and maintenance of sensors in the existing methods, realizes the real-time perception of the galloping situation of the wires of direct current overhead lines, has a large monitoring range, and improves the digital level of direct current overhead transmission lines.

[0007] The second object of the present application is to propose a device for monitoring direct current line galloping.

[0008] The third object of the present application is to propose a non-transitory computer-readable storage medium.

[0009] The fourth object of the present application is to propose a computer device.

[0010] To achieve the above object, an embodiment of the first aspect of the present application provides a method for monitoring the galloping of a DC line, including: establishing a mapping relationship between the induced current of the ground wire and the galloping characteristics of the conductor according to the line structure parameters; monitoring the induced current of the ground wire through a current sensor; when a low-frequency induced current is detected, performing a spectrum analysis on the detected low-frequency induced current to obtain at least one frequency component; and judging the galloping condition of the conductor based on the at least one frequency component according to the mapping relationship.

[0011] The method for monitoring the galloping of a DC line according to the embodiment of the present application analyzes the induced electromotive force generated in the ground wire loop when the conductor gallops, and then analyzes the induced current generated, establishes a mapping relationship between the frequency and amplitude of the induced current and the frequency and amplitude of the conductor galloping, and then performs an inverse deduction based on this relationship when the conductor gallops, so as to accurately judge the galloping condition of the conductor.

[0012] Optionally, in an embodiment of the present application, the DC overhead line includes a first conductor, a second conductor, a first ground wire, and a second ground wire. The first ground wire and the second ground wire adopt a tower-by-tower grounding operation mode. The first ground wire and the second ground wire form a ground wire loop. The first conductor and the first ground wire are on the same side, and the second conductor and the second ground wire are on the same side. The DC overhead line operates in a bipolar mode, with the first conductor / second conductor as the positive pole and the second conductor / first conductor as the negative pole.

[0013] Optionally, in an embodiment of the present application, establishing a mapping relationship between the induced current of the ground wire and the galloping characteristics of the conductor according to the line structure parameters includes:

[0014] Calculating the magnetic flux formed by each conductor acting on the ground wire loop when the conductor does not gallop, and superimposing the magnetic fluxes formed by all conductors to obtain the total magnetic flux on the ground wire loop;

[0015] Calculating the periodically changing total magnetic flux of the ground wire loop caused by the periodic change of the conductor height when the first conductor or the second conductor gallops, performing a time differentiation on the total magnetic flux to obtain the induced electromotive force of the ground wire loop, and determining the induced current generated on the ground wire when the conductor gallops based on the induced electromotive force of the ground wire loop and combining the internal resistance of the ground wire loop;

[0016] Constructing a mapping relationship between the galloping characteristics of the first conductor or the second conductor and the induced current of the ground wire based on the galloping condition of the first conductor or the second conductor and the determined induced current of the ground wire generated when the conductor gallops, where the frequency of the induced current of the ground wire is equal to the galloping frequency of the conductor, the current polarities in the first conductor and the second conductor are different, and the waveform phases of the induced current of the ground wire caused by the conductor galloping are different.

[0017] Optionally, in an embodiment of the present application, the magnetic field intensity generated by the DC current in the conductor in space is expressed as:

[0018]

[0019] Wherein, I is the magnitude of the current in the wire, and r is the distance from the wire;

[0020] When the first wire does not dance, the magnetic flux formed on the loop composed of two ground wires is expressed as:

[0021]

[0022] Wherein, l represents the span of the line, μ represents the magnetic permeability of air, I represents the magnitude of the current in the wire, D 12 represents the distance between the first wire and the second ground wire, D 11 represents the distance between the first wire and the first ground wire, D' 12 represents the mirror image distance of the first wire and the second ground wire with respect to the ground, D' 11 represents the mirror image distance of the first wire and the first ground wire with respect to the ground;

[0023] When the second wire does not dance, the calculation method of the magnetic flux formed on the loop composed of two ground wires is the same as that of the first wire;

[0024] When the wire dances, the average height of the wire from the ground is expressed as:

[0025] h = h0 + Asin(2πf + θ)

[0026] Wherein, A is the amplitude of the wire dance, f is the frequency of the wire dance, θ is the phase angle of the wire dance, and h0 is the initial height of the wire when it does not dance;

[0027] The induced electromotive force of the ground wire loop obtained by time-differentiating the magnetic flux is expressed as:

[0028]

[0029] Wherein, Ψ is the total magnetic flux on the ground wire loop, and Ψ is the algebraic sum of the magnetic fluxes formed by the first wire and the second wire on the ground wire loop.

[0030] Optionally, in an embodiment of the present application, based on at least one frequency component, judging the wire dancing condition according to the mapping relationship includes:

[0031] Judging that the first wire and / or the second wire is dancing based on the phase of the ground wire induced current waveform of each frequency component in at least one frequency component;

[0032] When the first wire and / or the second wire is dancing, according to the corresponding frequency component and based on the established mapping relationship, the dancing amplitude and frequency of the corresponding wire are deduced reversely.

[0033] To achieve the above object, an embodiment of the second aspect of the present application provides a DC line galloping monitoring device, including a current sensor and a monitoring device. Among them,

[0034] The monitoring device is configured to establish a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters;

[0035] The current sensor is configured to monitor the ground wire induced current and send the monitored ground wire induced current data to the monitoring device;

[0036] The monitoring device is further configured to perform spectral analysis on the low-frequency induced current when it is determined that the low-frequency induced current appears in the ground wire induced current data to obtain at least one frequency component;

[0037] The monitoring device is further configured to judge the conductor galloping condition based on at least one frequency component according to the mapping relationship.

[0038] Optionally, in an embodiment of the present application, the DC overhead line includes a first conductor, a second conductor, a first ground wire, and a second ground wire. The first ground wire and the second ground wire adopt a tower-by-tower grounding operation mode. The first ground wire and the second ground wire form a ground wire loop. The first conductor and the first ground wire are on the same side, and the second conductor and the second ground wire are on the same side. The DC overhead line operates in a bipolar mode. The first conductor / second conductor is the positive pole, and the second conductor / first conductor is the negative pole.

[0039] Optionally, in an embodiment of the present application, establishing a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters includes:

[0040] Calculate the magnetic flux formed by each conductor acting on the ground wire loop when the conductor is not galloping, and superimpose the magnetic fluxes formed by all conductors to obtain the total magnetic flux on the ground wire loop;

[0041] Calculate the periodically changing total magnetic flux of the ground wire loop caused by the periodic change of the conductor height when the first conductor or the second conductor is galloping, perform time differentiation on the total magnetic flux to obtain the induced electromotive force of the ground wire loop, and determine the induced current generated on the ground wire when the conductor is galloping based on the induced electromotive force of the ground wire loop and combined with the internal resistance of the ground wire loop;

[0042] Construct a mapping relationship between the galloping characteristics of the first conductor or the second conductor and the ground wire induced current based on the galloping condition of the first conductor or the second conductor and the determined ground wire induced current generated when the conductor is galloping. Among them, the frequency of the ground wire induced current is equal to the conductor galloping frequency, the current polarities in the first conductor and the second conductor are different, and the waveform phases of the ground wire induced current caused by the conductor galloping are different.

[0043] Optionally, in an embodiment of the present application, the magnetic field intensity generated by the DC current in the conductor in space is expressed as:

[0044]

[0045] Wherein, I is the magnitude of the current in the wire, and r is the distance from the wire;

[0046] When the first wire does not dance, the magnetic flux formed on the loop composed of two ground wires is expressed as:

[0047]

[0048] Wherein, l represents the line span, μ represents the magnetic permeability of air, I represents the magnitude of the current in the wire, D 12 represents the distance between the first wire and the second ground wire, D 11 represents the distance between the first wire and the first ground wire, D' 12 represents the mirror image distance of the first wire and the second ground wire with respect to the ground, D' 11 represents the mirror image distance of the first wire and the first ground wire with respect to the ground;

[0049] When the second wire does not dance, the calculation method of the magnetic flux formed on the loop composed of two ground wires is the same as that of the first wire;

[0050] When the wire dances, the average height of the wire from the ground is expressed as:

[0051] h = h0 + Asin(2πf + θ)

[0052] Wherein, A is the amplitude of wire dancing, f is the frequency of wire dancing, θ is the phase angle of wire dancing, and h0 is the initial height of the wire when it does not dance;

[0053] The induced electromotive force of the ground wire loop obtained by time-differentiating the magnetic flux is expressed as:

[0054]

[0055] Wherein, Ψ is the total magnetic flux on the ground wire loop, and Ψ is the algebraic sum of the magnetic fluxes formed by the first wire and the second wire on the ground wire loop.

[0056] Optionally, in an embodiment of the present application, based on at least one frequency component, judging the wire dancing condition according to the mapping relationship includes:

[0057] Judging that the first wire and / or the second wire is dancing based on the phase of the ground wire induced current waveform of each frequency component in at least one frequency component;

[0058] When the first wire and / or the second wire is dancing, according to the corresponding frequency component and based on the established mapping relationship, the dancing amplitude and frequency of the corresponding wire are deduced reversely.

[0059] To achieve the above object, an embodiment of the third aspect of the present application provides a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by a processor, the above-mentioned DC line galloping monitoring method can be executed.

[0060] To achieve the above object, an embodiment of the fourth aspect of the present application provides a computer 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, the above-mentioned DC line galloping monitoring method is implemented.

[0061] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0062] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0063] Figure 1 is a schematic flowchart of a DC line galloping monitoring method provided by Embodiment 1 of the present application;

[0064] Figure 2 is a structural diagram of an overhead DC line according to an embodiment of the present application;

[0065] Figure 3 is a schematic diagram of the monitoring process according to an embodiment of the present application;

[0066] Figure 4 is a schematic waveform diagram of the ground wire induced current when the conductors 1 and 2 respectively gallop according to an embodiment of the present application;

[0067] Figure 5 is a schematic diagram of the change in the effective value of the ground wire induced current under different galloping amplitudes and frequencies according to an embodiment of the present application;

[0068] Figure 6 is a schematic waveform diagram of the ground wire induced current when two conductors gallop simultaneously according to an embodiment of the present application;

[0069] Figure 7 is a schematic diagram of the spectrum analysis result of the ground wire induced current waveform when two conductors gallop simultaneously according to an embodiment of the present application;

[0070] Figure 8 is a schematic structural diagram of a DC line galloping monitoring device provided by an embodiment of the present application. Detailed Embodiments

[0071] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application.

[0072] The DC line galloping monitoring method, device, storage medium and electronic device according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0073] Figure 1 It is a schematic flowchart of a DC line galloping monitoring method provided by Embodiment 1 of the present application.

[0074] As Figure 1 shown, the DC line galloping monitoring method includes the following steps:

[0075] Step 101: Establish a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters;

[0076] Step 102: Monitor the ground wire induced current through a current sensor;

[0077] Step 103: When a low-frequency induced current is detected, perform spectrum analysis on the detected low-frequency induced current to obtain at least one frequency component;

[0078] Step 104: Based on at least one frequency component, judge the conductor galloping condition according to the established mapping relationship.

[0079] The DC line galloping monitoring method according to the embodiments of the present application analyzes the induced electromotive force generated in the ground wire loop when the conductor gallops, and then the induced current generated, establishes the relationship between the frequency and amplitude of the induced current and the frequency and amplitude of the conductor galloping, and then performs reverse inference based on this relationship when the conductor gallops, so as to accurately judge the conductor galloping condition.

[0080] Taking the operation mode in which both ground wires are grounded tower by tower as an example, the technical solution of the DC line galloping monitoring method will be described in this embodiment. Considering the overhead DC line structure as Figure 2 shown, the DC line operates in a bipolar mode. Let DC conductor 1 be the positive pole and conductor 2 be the negative pole. The span is set to 500 m, the resistivity of the ground wire is selected as 0.8 Ω / km, and the line operating current is set to 4000 A. It is considered that the earth is an ideal earth.

[0081] Taking the Figure 2 overhead DC line structure as an example, the monitoring process of this embodiment is as Figure 3 shown.

[0082] When the conductor does not gallop, the magnetic field generated by the direct current in the conductor in space can be calculated by the following formula for the magnetic field strength:

[0083]

[0084] In the formula, is the magnitude of the current in the conductor, r is the distance from the conductor, and the direction of the magnetic field strength conforms to the right-hand rule with the current direction. Thus, the magnetic linkage formed by a certain conductor acting on the loop composed of two ground wires can be calculated.

[0085] The following formula shows the calculation method of the magnetic linkage generated by the DC conductor 1 on the ground wire loop:

[0086]

[0087] In the formula, l represents the line span, μ represents the magnetic permeability of air, I represents the magnitude of the current in the conductor, D 12 represents the distance between the first conductor and the second ground wire, D 11 represents the distance between the first conductor and the first ground wire, D′ 12 represents the mirror image distance of the first conductor and the second ground wire with respect to the ground, D′ 11 represents the mirror image distance of the first conductor and the first ground wire with respect to the ground. Similarly, the magnetic linkage generated by the DC conductor 2 on the ground wire loop can be calculated, and the superposition of the two magnetic linkages is the total magnetic linkage Ψ of the ground wire loop.

[0088] Since the current in the DC line conductor is constant, the magnetic linkage of the ground wire loop does not change under normal circumstances. Therefore, there is no magnetic induction voltage or current on the ground wire. Now assume that conductor 1 gallops and conductor 2 does not gallop.

[0089] Galloping is a low-frequency, large-amplitude self-excited vibration of the conductor. When galloping, the spatial position change of the conductor has a certain periodicity. When galloping, the displacement of the conductor in the vertical direction is much larger than that in the horizontal direction. Therefore, the horizontal displacement of the conductor is ignored in the analysis. Therefore, the average height of the conductor from the ground during galloping can be expressed by Equation (3):

[0090] h = h0 + Asin(2πf + θ)

[0091] In the formula, A is the galloping amplitude of the conductor, f is the galloping frequency of the conductor, θ is the phase angle of the conductor galloping, and h0 is the initial height of the conductor when it does not gallop. The ground wire has a small diameter, high stress, and single split, and generally does not gallop easily or has a small galloping amplitude. Therefore, the distances between conductor 1 and the two ground wires change periodically. From the magnetic linkage calculation formula of conductor 1, it can be seen that the magnetic linkage acting on the loop composed of the two ground wires by conductor 1 also changes periodically. Since it is assumed that conductor 2 does not gallop, the total magnetic linkage of the ground wire loop changes periodically. As shown in the following formula, by taking the time derivative of the magnetic linkage, the induced electromotive force generated by the ground wire loop due to the change of the magnetic linkage can be obtained:

[0092]

[0093] Combined with the internal resistance of the ground wire loop, the induced current on the DC overhead line ground wire during galloping can be obtained.

[0094] Figure 4 The waveforms of the induced current on the ground wire when conductors 1 and 2 gallop respectively are shown and compared. According to the results, it can be seen that when the conductor gallops, obvious induced current waveforms will appear on the DC overhead ground wire. Moreover, the frequency of this induced current is equal to the galloping frequency of the conductor. Since the current polarities in conductors 1 and 2 are different, the phase of the induced current waveforms on the ground wire caused by conductor galloping differs by 180 degrees. Based on this, it is possible to distinguish which conductor is galloping.

[0095] By changing the amplitude and frequency of conductor galloping, the relationship mapping between the effective value of the induced current on the ground wire and the galloping characteristics of the conductor is obtained, as Figure 5 shown. According to the results, it can be seen that the effective value of the induced current on the ground wire shows a good linear relationship with the galloping amplitude of the conductor. At the same time, under the same galloping amplitude, the higher the galloping frequency of the conductor, the stronger the induced current on the ground wire. The reason for this phenomenon is that the higher the galloping frequency of the conductor, the faster the change of the spatial electromagnetic field it generates, the faster the change of the magnetic flux linkage on the ground wire, and thus the more intense the electromagnetic induction. Based on Figure 5 the mapping relationship, after determining the galloping frequency of the conductor based on the induced current on the ground wire, the reverse deduction from the ground wire current to the galloping amplitude of the conductor can be realized.

[0096] When conductors 1 and 2 gallop simultaneously, their galloping frequencies cannot be exactly the same. Assuming that the difference in their galloping frequencies is 10%, that is, the galloping frequency of the positive conductor 1 is 1 Hz and the galloping frequency of the negative conductor 2 is 1.1 Hz, the waveform of the induced current on the ground wire in this case is as Figure 6 shown. At this time, the waveform of the induced current on the ground wire is the superposition of sine waves of two frequencies. By performing spectral analysis on it, as Figure 7 shown, different galloping frequencies can be distinguished. Then, according to the phase of the corresponding frequency component, it can be determined which conductor's galloping causes this frequency component. Therefore, the present application can handle the situation where two conductors on the DC overhead line gallop simultaneously.

[0097] To implement the above embodiments, the present application also proposes a DC line galloping monitoring device.

[0098] Figure 8 It is a structural schematic diagram of a DC line galloping monitoring device provided by an embodiment of the present application.

[0099] As Figure 8 shown, the DC line galloping monitoring device includes a current sensor and a monitoring device, where

[0100] A monitoring device, configured to establish a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters;

[0101] A current sensor, configured to monitor the ground wire induced current and send the monitored ground wire induced current data to the monitoring device;

[0102] The monitoring device is further configured to perform a spectrum analysis on the low-frequency induced current when it is determined that the low-frequency induced current appears in the ground wire induced current data, so as to obtain at least one frequency component;

[0103] The monitoring device is further configured to determine the conductor galloping condition based on at least one frequency component according to the mapping relationship.

[0104] Optionally, in an embodiment of the present application, the DC overhead line includes a first conductor, a second conductor, a first ground wire, and a second ground wire. The first ground wire and the second ground wire adopt a tower-by-tower grounding operation mode. The first ground wire and the second ground wire form a ground wire loop. The first conductor and the first ground wire are on the same side, and the second conductor and the second ground wire are on the same side. The DC overhead line operates in a bipolar mode, with the first conductor / second conductor as the positive pole and the second conductor / first conductor as the negative pole.

[0105] Optionally, in an embodiment of the present application, establishing a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters includes:

[0106] Calculating the magnetic flux formed by each conductor acting on the ground wire loop when the conductor is not galloping, and superimposing the magnetic fluxes formed by all conductors to obtain the total magnetic flux on the ground wire loop;

[0107] Calculating the periodically changing total magnetic flux of the ground wire loop caused by the periodic change of the conductor height when the first conductor or the second conductor is galloping, performing a time differentiation on the total magnetic flux to obtain the induced electromotive force of the ground wire loop, and determining the induced current generated on the ground wire when the conductor is galloping based on the induced electromotive force of the ground wire loop and in combination with the internal resistance of the ground wire loop;

[0108] Constructing a mapping relationship between the galloping characteristics of the first conductor or the second conductor and the ground wire induced current based on the galloping condition of the first conductor or the second conductor and the determined ground wire induced current generated when the conductor is galloping, wherein the frequency of the ground wire induced current is equal to the conductor galloping frequency, the current polarities in the first conductor and the second conductor are different, and the waveform phases of the ground wire induced current caused by the conductor galloping are different.

[0109] Optionally, in an embodiment of the present application, the magnetic field intensity generated by the direct current in the conductor in space is expressed as:

[0110]

[0111] Wherein, I is the magnitude of the current in the wire, and r is the distance from the wire;

[0112] When the first wire does not dance, the magnetic flux formed on the loop constituted by the two ground wires is expressed as:

[0113]

[0114] Wherein, l represents the line span, μ represents the magnetic permeability of air, I represents the magnitude of the current in the wire, D 12 represents the distance between the first wire and the second ground wire, D 11 represents the distance between the first wire and the first ground wire, D′ 12 represents the mirror image distance of the first wire and the second ground wire with respect to the ground, D′ 11 represents the mirror image distance of the first wire and the first ground wire with respect to the ground;

[0115] When the second wire does not dance, the calculation method of the magnetic flux formed on the loop constituted by the two ground wires is the same as that of the first wire;

[0116] The average height of the wire from the ground when the wire dances is expressed as:

[0117] h = h0 + Asin(2πf + θ)

[0118] Wherein, A is the amplitude of the wire dance, f is the frequency of the wire dance, θ is the phase angle of the wire dance, and h0 is the initial height of the wire when it does not dance;

[0119] The induced electromotive force of the ground wire loop obtained by differentiating the magnetic flux with respect to time is expressed as:

[0120]

[0121] Wherein, Ψ is the total magnetic flux on the ground wire loop, and Ψ is the algebraic sum of the magnetic fluxes formed by the first wire and the second wire on the ground wire loop.

[0122] Optionally, in an embodiment of the present application, based on at least one frequency component, judging the wire dancing condition according to the mapping relationship includes:

[0123] Judging that the first wire and / or the second wire dances based on the phase of the ground wire induced current waveform of each frequency component in at least one frequency component;

[0124] When the first wire and / or the second wire dances, according to the corresponding frequency component and based on the established mapping relationship, the dancing amplitude and frequency of the corresponding wire are deduced inversely.

[0125] It should be noted that the foregoing explanation of the embodiments of the DC line galloping monitoring method also applies to the DC line galloping monitoring device of this embodiment, and will not be elaborated here.

[0126] To implement the above embodiments, the present application also proposes a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method of the above embodiments is implemented.

[0127] To implement the above embodiments, the present application also proposes a computer 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, the method described in the above embodiments is implemented.

[0128] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean 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. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0129] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0130] Any process or method description shown in the flowchart or described in other ways herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in an order opposite to that shown or discussed, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0131] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0132] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0133] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the methods of the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0134] In addition, each functional unit in various embodiments of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0135] The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A method for monitoring the galloping of a DC line, characterized in that, Comprising: Establish a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters; Monitor the ground wire induced current through a current sensor; When a low-frequency induced current is detected, perform a spectral analysis on the detected low-frequency induced current to obtain at least one frequency component; Based on the at least one frequency component, judge the conductor galloping condition according to the mapping relationship; Wherein, the DC overhead line includes a first conductor, a second conductor, a first ground wire and a second ground wire. The first ground wire and the second ground wire adopt a tower-by-tower grounding operation mode. The first ground wire and the second ground wire form a ground wire loop. The first conductor and the first ground wire are on the same side, the second conductor and the second ground wire are on the same side. The DC overhead line operates in a bipolar mode. The first conductor is the positive pole and the second conductor is the negative pole, or the first conductor is the negative pole and the second conductor is the positive pole; The establishing a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters includes: Calculate the magnetic flux formed on the ground wire loop by each conductor when the conductor is not galloping, and superimpose the magnetic fluxes formed by all conductors to obtain the total magnetic flux on the ground wire loop; Calculate the periodically changing total magnetic flux of the ground wire loop caused by the periodically changing conductor height when the first conductor or the second conductor is galloping, and perform a time differential on the total magnetic flux to obtain the induced electromotive force of the ground wire loop. Based on the induced electromotive force of the ground wire loop and combined with the internal resistance of the ground wire loop, determine the induced current generated on the ground wire when the conductor is galloping; Construct a mapping relationship between the galloping characteristics of the first conductor or the second conductor and the ground wire induced current based on the galloping condition of the first conductor or the second conductor and the determined ground wire induced current generated when the conductor is galloping. Among them, the frequency of the ground wire induced current is equal to the conductor galloping frequency, the current polarities in the first conductor and the second conductor are different, and the waveform phases of the ground wire induced current caused by conductor galloping are different; The magnetic field intensity generated by the DC current in the conductor in space is expressed as: Among them, is the magnitude of the current in the wire, is the distance from the wire; When the first conductor is not galloping, the magnetic flux formed on the loop composed of two ground wires is expressed as: Among them, represents the line span, represents the air permeability, represents the magnitude of the current in the conductor, represents the distance between the first conductor and the second ground wire, represents the distance between the first conductor and the first ground wire, represents the mirror image distance of the first conductor and the second ground wire with respect to the ground, represents the mirror image distance of the first conductor and the first ground wire with respect to the ground; The calculation method of the magnetic flux formed on the loop composed of two ground wires when the second conductor is not galloping is the same as that of the first conductor; The average height of the conductor from the ground when the conductor is galloping is expressed as: Among them, is the amplitude of conductor galloping, is the frequency of conductor galloping, is the phase angle of conductor galloping, is the initial height of the conductor when the conductor is not galloping; The induced electromotive force of the ground wire loop obtained by performing a time differential on the magnetic flux is expressed as: Among them, is the total magnetic flux on the ground wire loop, is the algebraic sum of the magnetic fluxes formed by the first wire and the second wire on the ground wire loop.

2. The DC line galloping monitoring method according to claim 1, wherein The judging the conductor galloping condition according to the mapping relationship based on the at least one frequency component includes: If there is one frequency component, judge that one conductor is galloping. If there are two frequency components, judge that two conductors are galloping. For each frequency component in the ground wire induced current, judge the corresponding conductor is galloping according to its phase; When the conductor is galloping, based on the corresponding frequency component and the established mapping relationship, inversely deduce the galloping amplitude and frequency of the corresponding conductor.

3. A DC line galloping monitoring device, characterized in that, Including a current sensor and a monitoring device, wherein, The monitoring device is used to establish a mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters; The current sensor is used to monitor the ground wire induced current and send the monitored ground wire induced current data to the monitoring device; The monitoring device is further configured to perform a spectrum analysis on the low-frequency induced current when it is determined that the low-frequency induced current appears in the ground wire induced current data, so as to obtain at least one frequency component; The monitoring device is further configured to judge the conductor galloping condition according to the mapping relationship based on the at least one frequency component; Wherein, the DC overhead line includes a first conductor, a second conductor, a first ground wire and a second ground wire. The first ground wire and the second ground wire adopt an operation mode of grounding tower by tower. The first ground wire and the second ground wire form a ground wire loop. The first conductor and the first ground wire are on the same side, and the second conductor and the second ground wire are on the same side. The DC overhead line operates in a bipolar mode. The first conductor is the positive pole and the second conductor is the negative pole, or the first conductor is the negative pole and the second conductor is the positive pole; The establishment of the mapping relationship between the ground wire induced current and the conductor galloping characteristics according to the line structure parameters includes: Calculating the magnetic flux formed by each conductor acting on the ground wire loop when the conductor is not galloping, and superimposing the magnetic fluxes formed by all conductors to obtain the total magnetic flux on the ground wire loop; Calculating the periodically changing total magnetic flux of the ground wire loop caused by the periodic change of the conductor height when the first conductor or the second conductor is galloping, and performing a time differentiation on the total magnetic flux to obtain the induced electromotive force of the ground wire loop. Based on the induced electromotive force of the ground wire loop and combined with the internal resistance of the ground wire loop, determining the induced current generated on the ground wire when the conductor is galloping; Constructing a mapping relationship between the galloping characteristics of the first conductor or the second conductor and the ground wire induced current based on the galloping condition of the first conductor or the second conductor and the determined ground wire induced current generated when the conductor is galloping. Wherein, the frequency of the ground wire induced current is equal to the conductor galloping frequency, the current polarities in the first conductor and the second conductor are different, and the waveform phases of the ground wire induced current caused by the conductor galloping are different; The magnetic field intensity generated by the direct current in the conductor in space is expressed as: Among them, is the magnitude of the current in the wire, is the distance from the wire; When the first conductor is not galloping, the magnetic flux formed by acting on the loop composed of the two ground wires is expressed as: Among them, represents the line span, represents the air permeability, represents the magnitude of the current in the wire, represents the distance between the first wire and the second ground wire, represents the distance between the first wire and the first ground wire, represents the mirror image distance of the first wire and the second ground wire with respect to the ground, represents the mirror image distance of the first wire and the first ground wire with respect to the ground; The calculation method of the magnetic flux formed by acting on the loop composed of the two ground wires when the second conductor is not galloping is the same as that of the first conductor; The average height of the conductor from the ground when the conductor is galloping is expressed as: Among them, is the amplitude of conductor galloping, is the frequency of conductor galloping, is the phase angle of conductor galloping, is the initial height of the conductor when the conductor is not galloping; The induced electromotive force of the ground wire loop obtained by performing a time differentiation on the magnetic flux is expressed as: Among them, is the total magnetic flux on the ground wire loop, is the algebraic sum of the magnetic fluxes formed by the first wire and the second wire on the ground wire loop.

4. The DC line galloping monitoring device according to claim 3, characterized in that, The judging the conductor galloping condition according to the mapping relationship based on the at least one frequency component includes: If there is one frequency component, it is judged that one conductor is galloping. If there are two frequency components, it is judged that two conductors are galloping. For each frequency component in the ground wire induced current, judge the corresponding conductor that is galloping according to its phase; When the conductor is galloping, based on the corresponding frequency component and the established mapping relationship, the galloping amplitude and frequency of the corresponding conductor are inversely deduced.

5. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the DC line galloping monitoring method according to any one of claims 1-2.

6. A computer device, characterized in that, It includes 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 implements the DC line galloping monitoring method according to any one of claims 1-2.

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