Rapid deicing method and system for overhead lightning protection ground wire based on resonance principle
By applying a periodic vibration force close to the inherent resonant frequency of the ground wire of the overhead transmission line, the ice-covered ground wire is vibrated and broken off by utilizing the resonance principle. This solves the problem of inefficient and safe de-icing of ground wires in existing technologies, and achieves efficient, safe and environmentally friendly de-icing results.
Patent Information
- Application Number
- CN202510902065.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-01
- Publication Date
- 2025-11-21
AI Technical Summary
Existing technologies are difficult to use efficiently and safely to remove ice from ground wires in overhead transmission lines, and are greatly affected by environmental factors, especially in complex terrain where de-icing efficiency is low.
By applying a periodic vibration force close to its inherent resonant frequency to the ground wire, the ice-covered ground wire is vibrated and broken off using the principle of resonance. This is controlled by a vibration device and a photovoltaic power supply system.
It achieves efficient and safe icing removal, reduces damage to ground wires, is suitable for complex terrain, and is environmentally friendly, not relying on chemical agents or large amounts of energy.
Smart Images
Figure CN120999501A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power transmission line disaster prevention and mitigation, and in particular to a resonance principle-based overhead lightning protection ground wire rapid deicing method and system. BACKGROUND
[0002] Line icing refers to the phenomenon that raindrops or wet snow adhere to the power transmission line and freeze rapidly to form a thick ice layer under low temperature conditions, resulting in the line being wrapped in a large area by the ice layer. Line icing can make the originally slender conductor and ground wire become like an "ice stick", significantly increasing the weight of the line. For the main power grid with a long transmission distance, this additional weight can greatly increase the bearing pressure of the tower, and thus may cause conductor breakage, tower collapse and other serious accidents. In order to prevent the safety hazards and economic losses caused by icing, it is necessary to timely remove the ice layer and snow on the power transmission line to reduce the load of the line and ensure the safe and stable operation of the power system.
[0003] At present, the deicing technologies for conductors and ground wires in overhead power transmission lines at home and abroad can be mainly divided into three categories:
[0004] (1) Thermal deicing: by passing a large current through the conductor, the conductor is heated to melt the ice by using the principle of electric resistance heating. Thermal deicing has been relatively maturely applied to power transmission conductors, but it faces many difficulties in ground wire deicing. On the one hand, the ground wire needs to be structurally modified, which has a large construction difficulty and engineering quantity; on the other hand, the ground wire is prone to air gap breakdown when several thousand volts are applied under the icing state, resulting in insulation failure and thus affecting the normal progress of the heating deicing process.
[0005] (2) Passive deicing: usually, specific devices are installed on the cable or anti-icing materials are coated, and deicing or slowing down of ice formation is achieved by means of natural conditions such as wind energy and solar energy. Although it is energy-saving and environmentally friendly, the deicing efficiency is low, and the effect is greatly affected by environmental factors, having strong randomness and uncertainty.
[0006] (3) Mechanical deicing: including manual knocking deicing, line robot deicing and blasting deicing. Among them, manual and blasting deicing rely on manual operation, which is not only low in efficiency and poor in safety, but also is limited by terrain conditions. Although the line robot deicing has certain automation potential, the robot needs to carry heavy batteries, and the weight of the robot itself is large, so the operation is difficult, especially in the case of thick ice layer, the deicing efficiency is also significantly reduced. SUMMARY
[0007] In view of the above or the problems existing in the prior art that the deicing technology for power transmission lines cannot be applied to ground wires and has high deicing efficiency, good safety and small environmental limitation, the present application is proposed.
[0008] Therefore, the purpose of the present application is to provide a lightning protection overhead ground wire rapid deicing method based on resonance principle, which can be applied to the deicing needs of the ground wire, and can achieve high deicing efficiency, good safety and small environmental limitations.
[0009] To solve the above technical problems, the present application provides the following technical solutions: a lightning protection overhead ground wire rapid deicing method based on resonance principle, comprising: taking any specific position of the iced ground wire close to the tower as a deicing force point;
[0010] An external periodic vibration force is applied to the deicing force point, and the frequency of the external periodic vibration force is close to the inherent optimal resonance frequency of the iced ground wire;
[0011] By continuously superimposing the external periodic vibration force, the iced ground wire is rapidly vibrated, thereby causing the ice layer on the iced ground wire to break and fall off.
[0012] As a preferred scheme of the lightning protection overhead ground wire rapid deicing method based on resonance principle, the number of deicing force frequency points is at least two groups, and the external periodic vibration force is repeatedly changed in at least two groups of deicing force frequency points each time.
[0013] As a preferred scheme of the lightning protection overhead ground wire rapid deicing method based on resonance principle, the frequency of the external periodic vibration force is close to the inherent optimal resonance frequency of the iced ground wire, which specifically includes the following steps:
[0014] Obtain the parameter information of the target iced ground wire, including the length, model of the target iced ground wire and the maximum safe tension of the towers at both ends of the target iced ground wire;
[0015] Model the target iced ground wire based on the parameter information, and perform harmonic response frequency analysis based on modal analysis of the target iced ground wire;
[0016] According to the harmonic response frequency analysis result, determine at least two groups of frequency points with the strongest vibration amplitude of the target iced ground wire as the optimal resonance frequency points, and take the frequencies of the two groups of optimal resonance frequency points as the reference for frequency control of the external periodic vibration force.
[0017] As a preferred scheme of the lightning protection overhead ground wire rapid deicing method based on resonance principle, the harmonic response frequency analysis is performed based on modal analysis of the target iced ground wire, which specifically includes the following steps:
[0018] Simulate the application of different vibration orders to the same position of the target iced ground wire to analyze the stress and amplitude characteristics of the target iced ground wire;
[0019] The harmonic form periodic exciting force is applied to the target icing ground wire at different positions to analyze the amplitude response of different resonance points of the target icing ground wire.
[0020] To further solve the above technical problems, the application provides the following technical scheme: a system of an overhead lightning protection ground wire rapid deicing method based on resonance principle, comprising a vibration device installed on the overhead lightning protection ground wire;
[0021] An acceleration sensor is installed at the intermediate position of the vibration device and the No. 1 tower.
[0022] A controller is connected to the vibration device and the acceleration sensor through a cable.
[0023] As a preferred scheme of the system of the overhead lightning protection ground wire rapid deicing method based on resonance principle, the photovoltaic panel is installed on the sun side of the tower.
[0024] A power supply box is installed between the photovoltaic panel and the tower.
[0025] The power supply box stores the power transmitted by the photovoltaic panel and provides power supply for the controller, and the controller provides power supply for the vibration device and the acceleration sensor.
[0026] As a preferred scheme of the system of the overhead lightning protection ground wire rapid deicing method based on resonance principle, the vibration device is installed on the hanging point on any side of the deicing point.
[0027] As a preferred scheme of the system of the overhead lightning protection ground wire rapid deicing method based on resonance principle, the effective working vibration frequency range of the vibration device is controlled within 7-26 Hz, and the minimum frequency adjustment range of the vibration device is controlled within 0.1-0.3 Hz.
[0028] The application has the advantages of high deicing efficiency, good safety, and strong environmental adaptability.
[0029] The system has the advantages of simple structure, remote control, green energy utilization, and is especially suitable for ground wire deicing in complex terrain and areas difficult to intervene manually, effectively improves the reliability of power transmission line operation and the intelligent level of deicing operation. BRIEF DESCRIPTION OF DRAWINGS
[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.
[0031] Figure 1 The schematic diagram of the overall process of the overhead lightning protection ground wire rapid deicing method based on the resonance principle of the present application.
[0032] Figure 2 The schematic diagram of the specific installation position of the system of the overhead lightning protection ground wire rapid deicing method based on the resonance principle of the present application in use.
[0033] Figure 3 The schematic diagram of the 9.584Hz (100th order) mode shape in the simulation analysis of the overhead lightning protection ground wire rapid deicing method based on the resonance principle of the present application.
[0034] Figure 4 The schematic diagram of the 18.43Hz (200th order) mode shape in the simulation analysis of the overhead lightning protection ground wire rapid deicing method based on the resonance principle of the present application.
[0035] Figure 5 The schematic diagram of the 24.77Hz (300th order) mode shape in the simulation analysis of the overhead lightning protection ground wire rapid deicing method based on the resonance principle of the present application.
[0036] Figure 6 The distribution diagram of the resonance frequency points of the iced ground wire in the present application.
[0037] Figure 7 The effect diagram of the iced ground wire before actual vibration based on the overhead lightning protection ground wire rapid deicing method and system based on the resonance principle of the present application.
[0038] Figure 8 The effect diagram of the iced ground wire after actual vibration based on the overhead lightning protection ground wire rapid deicing method and system based on the resonance principle of the present application. DETAILED DESCRIPTION
[0039] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.
[0040] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be practiced in other ways different from the description, and those skilled in the art can make similar generalizations without creative labor, so the present application is not limited to the specific embodiments disclosed below.
[0041] Second, the "one embodiment" or "an embodiment" referred to herein means a specific feature, structure, or characteristic under discussion. Each of the various embodiments presented in this specification are not necessarily all mutually exclusive alternatives from other embodiments presented. It is therefore not a requirement that all of the features of one embodiment be included in all of the embodiments of these applications.
[0042] Embodiment 1
[0043] Reference Figure 1 For the first embodiment of the present application, the embodiment provides a resonance-based overhead lightning protection ground wire rapid deicing method, comprising:
[0044] S1: Any specific position of the iced ground wire near the iron tower is selected as the deicing force point;
[0045] S2: A set of external periodic vibration forces is applied to the deicing force point, so that the frequency of the external periodic vibration forces is close to the inherent optimal resonant frequency of the iced ground wire;
[0046] S3: The iced ground wire is rapidly vibrated by continuously superimposing the external periodic vibration forces, thereby causing the ice layer on the iced ground wire to break and fall off.
[0047] It should be noted that in this embodiment, the object of deicing refers to a certain overhead ground wire between every two adjacent levels of iron towers, and the range of the object of deicing refers to implementing large-scale rapid deicing based on the resonance principle on the ice on a certain overhead ground wire between every two adjacent levels of iron towers.
[0048] Preferably, the deicing force point is selected in the vicinity of the iced ground wire near the iron tower, and the middle region of the entire ground wire is not involved. Since the two ends of the ground wire are connected to the iron tower, the ground wire near the iron tower is firmly fixed and stably supported. When the periodic vibration force is applied near the iron tower, the additional stress impact on the ground wire body structure and the suspension point of the device providing the external periodic vibration force can be effectively reduced, and safety hazards such as ground wire breakage or connection loosening caused by vibration can be avoided. In comparison, the middle region of the ground wire is a free-hanging section, and the stress state is easily affected by external environmental factors. Applying external force in this region can easily cause local stress concentration and increase mechanical risk. In addition, the position near the iron tower is convenient for installing the device providing the external periodic vibration force, and is also convenient for later maintenance and replacement. The middle region is located between two iron towers, usually in high altitude and away from the operation channel, which is not conducive to equipment deployment and daily maintenance.
[0049] It should be noted that the inherent optimal resonant frequency of the iced ground wire refers to the frequency at which the ground wire is most prone to large vibrations under inherent tension, length and icing conditions. When the frequency of the external periodic vibration force is close to the inherent optimal resonant frequency of the iced ground wire, resonance effect is excited, small force drives large force, and the vibration amplitude of the entire ground wire is amplified, which not only improves the ice removal efficiency, but also reduces unnecessary energy consumption.
[0050] Preferably, under the resonance condition, the periodic vibration external force is continuously applied to the ground wire, so that the entire ground wire produces continuous and strong vibration response, and finally causes the ice layer on the surface of the ground wire to break and fall off due to shear stress and fatigue failure.
[0051] In summary, the present application can achieve efficient ice removal of the entire line, and the ice layer can naturally fall off without relying on scraping, heating and other methods, thereby avoiding secondary damage to the ground wire. Moreover, the frequency of the external periodic vibration force and the controllability of the specific ice removal force point are strong, and the vibration time and intensity can be set according to the icing degree, without the need for chemical agents or large energy consumption. The present application is not only environmentally friendly, but also not limited by environmental interference to the actual ice removal effect.
[0052] Embodiment 2
[0053] Reference Figure 1 For the second embodiment of the present application, the embodiment provides a lightning protection overhead ground wire rapid ice removal method based on resonance principle, comprising:
[0054] S1: Any specific position of the iced ground wire close to the tower is selected as an ice removal force point;
[0055] S2: A group of external periodic vibration forces are applied to the ice removal force point, so that the frequency of the external periodic vibration force is close to the inherent optimal resonant frequency of the iced ground wire;
[0056] S3: The iced ground wire is rapidly vibrated by continuously superimposing the external periodic vibration force, thereby causing the ice layer on the iced ground wire to break and fall off.
[0057] Further, the number of ice removal force points is at least two groups, and the actual force point is repeatedly changed in at least two groups of ice removal force points each time the external periodic vibration force is applied.
[0058] It should be noted that the number of ice removal force points is at least two groups, which means that two or more fixed or optional positions in the forceable range of the iced ground wire close to the tower are pre-set as reference ice removal force points, and the best actual ice removal force points of at least two or more groups are determined from the reference ice removal force points according to actual experimental operation, so as to ensure that the best actual ice removal force points suitable for the icing degree can be determined.
[0059] Preferably, when the number of deicing force application points is two groups or more, the control system determines the frequency range of the external periodic vibration force applied to each deicing force application point according to real-time feedback such as vibration amplitude, frequency response, and ice thickness, so as to determine the frequency range of the external periodic vibration force applied to each deicing force application point, and to determine the best resonance frequency range of the icing ground wire under different icing degrees by applying different frequencies to each representative point.
[0060] In summary, the present application can excite various modal vibrations of the ground wire such as first-order, second-order, and third-order harmonics through multi-point excitation, thereby more comprehensively destroying the ice layer structure, and the excitation at different positions helps to compensate for local weak vibration areas and improve overall deicing efficiency. When the icing degree is severe, long-term application of force at a single point can cause local fatigue damage, and rotation of deicing force application points can disperse stress.
[0061] Embodiment 3
[0062] Reference Figure 1 For the third embodiment of the present application, the embodiment provides an overhead lightning protection ground wire rapid deicing method based on resonance principle, comprising:
[0063] S1: Any specific position of the icing ground wire close to the tower is taken as a deicing force application point;
[0064] S2: A group of external periodic vibration forces are applied to the deicing force application point, so that the frequency of the external periodic vibration force is close to the best resonance frequency inherent to the icing ground wire;
[0065] S3: The icing ground wire is rapidly vibrated by continuously superimposing the external periodic vibration force, thereby causing the ice layer on the icing ground wire to break and fall off.
[0066] Further, the number of deicing force application frequency points is at least two groups, and the external periodic vibration force is repeatedly changed among at least two groups of deicing force application frequency points each time.
[0067] Preferably, the amplitude feedback of the ground wire can be viewed and compared by changing the frequency size at the same position, so as to determine the best resonance frequency range of the current icing ground wire, thereby determining the frequency range of the external periodic vibration force applied to each deicing force application point, and determining the best resonance frequency range of the ground wire under different icing degrees by applying different frequencies to each representative point.
[0068] Embodiment 4
[0069] Reference Figure 1 For the fourth embodiment of the present application, the embodiment provides an overhead lightning protection ground wire rapid deicing method based on resonance principle, comprising:
[0070] S1: The icing ground wire is close to any specific position of the iron tower, which is used as the deicing force point;
[0071] S2: A set of external periodic vibration forces is applied to the deicing force point, and the frequency of the external periodic vibration force is close to the inherent optimal resonance frequency of the icing ground wire;
[0072] S3: The icing ground wire is rapidly vibrated by continuously superimposing the external periodic vibration force, thereby causing the ice layer on the icing ground wire to break and fall off.
[0073] Further, the number of deicing force frequency points is at least two groups, and the external periodic vibration force is repeatedly changed in at least two groups of deicing force frequency points each time.
[0074] Further, the number of deicing force frequency points is at least two groups, and the external periodic vibration force is repeatedly changed in at least two groups of deicing force frequency points each time.
[0075] Further, the frequency of the external periodic vibration force is close to the inherent optimal resonance frequency of the icing ground wire, which specifically includes the following steps:
[0076] Obtain the parameter information of the target icing ground wire; including the length, model of the target icing ground wire and the maximum safe tension of the iron tower at both ends of the target icing ground wire;
[0077] Based on the parameter information, the target icing ground wire is modeled, and the harmonic response frequency analysis is performed based on the modal analysis of the target icing ground wire;
[0078] According to the harmonic response frequency analysis result, at least two groups of frequency points with the strongest vibration amplitude of the target icing ground wire are determined as the optimal resonance frequency points, and the frequencies of the two groups of optimal resonance frequency points are used as the reference for frequency control of the external periodic vibration force.
[0079] Further, the harmonic response frequency analysis is performed based on the modal analysis of the target icing ground wire, which specifically includes the following steps:
[0080] Simulate the application of different vibration orders to the same position of the target icing ground wire to analyze the stress and amplitude characteristics of the target icing ground wire;
[0081] Simulate the application of a periodic excitation force in simple harmonic form to different positions of the target icing ground wire to analyze the amplitude response of different resonance points of the target icing ground wire.
[0082] It should be noted that in this embodiment, the mechanical simulation model must be modeled in advance to analyze and obtain the accurate resonance frequency of the icing ground wire. In actual application, the frequency needs to be dynamically adjusted to adapt to different icing thickness and environmental conditions. If the frequency deviates too much, it may not be able to excite resonance, or even cause damage to the ground wire structure. At the same time, the sensor needs to be used to monitor the vibration state of the ground wire in real time to avoid overload.
[0083] It should be noted that the length of the ground wire determines the basic vibration characteristics of the ground wire, and long ground wires are more prone to low-frequency large swings such as dancing, while short ground wires tend to high-frequency small vibrations such as wind vibration; Ground wire models such as GJ-50 and GJ-80, GJ series are commonly used steel strand ground wire models in our country, where "GJ" means "steel strand", and the following numbers such as 50, 80 represent the nominal cross-sectional area in mm 2 Reflecting the physical properties of material density, cross-sectional area, elastic modulus, etc., the cross-sectional area of GJ-50 is about 50 mm 2 , commonly used for medium and low voltage transmission lines, while GJ-80 has a larger cross-sectional area and is suitable for higher voltage levels or large spans, with higher mechanical strength and vibration resistance; The maximum safety tension of the tower refers to the maximum tension value that the tower structure design can withstand, which is used to constrain the tension boundary conditions in modeling to prevent the calculation results from exceeding the safe range of the structure, for example, when simulating ground wire dancing or wind vibration, if the wind load is too large, it will cause the ground wire tension to abnormally rise, by setting the maximum safety tension of the tower, the early warning mechanism or the model parameters can be automatically triggered in the simulation, so as to ensure the rationality and safety of the results.
[0084] Preferably, in the embodiment, when the device providing external periodic vibration force vibrates the iced conductor, the vibration wave is a standing wave, and the positions of the wave crests and troughs are fixed under the standing wave condition, and the damage stress and the swing force of the iced conductor at the wave crests and troughs are the largest, therefore, in order to increase the breaking range of the iced layer, it is necessary to change the positions of the wave crests and troughs by changing the resonance frequency, so as to achieve the maximum range of breaking and falling of the iced layer, the longer the iced ground wire, the longer the period of a single standing wave, therefore, the more resonance frequency points are needed, so that the positions of the wave crests and troughs are more, thereby being more conducive to the ice removal effect.
[0085] The working process of the embodiment is: based on the specific parameters of the target iced ground wire, a mechanical simulation software is used to model the iced ground wire; based on the stress model, further stress analysis is carried out, different order vibration simulation is carried out on the stress model, and the stress and amplitude of the iced ground wire are analyzed, a periodic excitation force in simple harmonic form is applied to different positions of the iced ground wire to analyze the vibration characteristics of the iced ground wire; According to the analysis result, find out multiple preferred resonance frequency points of the iced ground wire and the corresponding external periodic vibration force frequency size, and take at least three groups of best resonance point frequencies as reference parameters for controlling the external periodic vibration force frequency size in the subsequent control;
[0086] Based on the determined at least two groups of best resonance point frequencies, the corresponding device is used to provide the external periodic vibration force, which can generate an external excitation force sufficient to make the target iced ground wire vibrate;
[0087] The device providing external periodic vibration force is installed in the range of the best vibration position calculated by the simulation model, and the best resonance frequency point parameter calculated by the simulation model is written into the vibration controller of the device providing external periodic vibration force as a parameter storage;
[0088] When deicing, the device providing external periodic vibration force is started by the external controller, and the device providing external periodic vibration force starts from 0 Hz frequency and increases the vibration frequency by fixed frequency steps, and when the vibration frequency increases to the first best resonance frequency determined by the simulation result, the acceleration value of the iced ground wire is detected by the external acceleration sensor;
[0089] The vibration frequency is adjusted upward by fixed frequency steps, if the detected acceleration average value increases, continue to adjust upward, if the detected acceleration average value decreases, adjust downward by fixed frequency steps, repeat the adjustment process until the acceleration average value is at the maximum value, the frequency range of the upward and downward adjustment steps is the first best resonance frequency point ± 0.5 Hz, and then continue to vibrate for 5 minutes;
[0090] By analogy, after the frequency adjustment operation of all selected best resonance frequencies and the vibration of the ground wire at these frequencies are completed, the vibration frequency is reduced by fixed frequency steps until the frequency is reduced to 0 Hz, and the whole deicing process is completed.
[0091] Embodiment 5
[0092] Reference Figures 5 to 8 For the fifth embodiment of the application, which is different from the first four embodiments, a lightning protection overhead ground wire rapid deicing system based on resonance principle is provided.
[0093] Specifically, it includes a vibration device 1 installed on the lightning protection overhead ground wire;
[0094] An acceleration sensor 2 is installed at the intermediate position of the vibration device 1 and the No. 1 tower;
[0095] And a controller 3, the controller 3 is connected with the vibration device 1 and the acceleration sensor 2 through a cable.
[0096] Further, a photovoltaic panel 4 is installed on the sun side of the tower;
[0097] And a power supply box 5 is installed between the photovoltaic panel 4 and the tower;
[0098] The power supply box 5 stores the power transmitted by the photovoltaic panel 4 and provides power for the controller 3, and the controller 3 provides power for the vibration device 1 and the acceleration sensor 2.
[0099] Further, the vibration device 1 is installed on the hanging point on any side of the deicing point.
[0100] Furthermore, the effective operating vibration frequency range of the vibration device 1 is controlled between 7Hz and 26Hz, and the minimum frequency adjustment range of the vibration device 1 is controlled between 0.1Hz and 0.3Hz.
[0101] It should be noted that before icing occurs, the photovoltaic panel 4 continuously charges the battery. At this time, the vibration equipment is not working, so there is no power consumption issue. When icing occurs, even if the photovoltaic panel 4 cannot draw power, the battery is sufficient to work continuously for 5 hours. Installing the photovoltaic panel 4 and controller 3 on the transmission tower is a routine operation for the installation of online monitoring devices for transmission lines, which can ensure electrical safety.
[0102] It should be noted that the distance between the vibration device 1 and the No. 1 transmission tower is approximately 8 to 10 meters. This is to avoid the vibration device 1 being too close to the transmission tower, which would make it difficult for the icy ground wire to vibrate, and too far from the transmission tower, which would make installation inconvenient. The power and communication lines of the vibration device 1 are connected to the controller 3 via cables, and the signal line of the acceleration sensor is also connected to the controller 3 via cables. The entire device is powered by photovoltaic panels 4. The DC power obtained by the photovoltaic panels 4 is sent to the power supply box 5. A large-capacity battery and a 24VDC to 220VAC inverter are installed in the power supply box 5 to provide power to the controller 3, which in turn powers the vibration device 1 and the acceleration sensor 2.
[0103] The working process of this embodiment is as follows: First, determine the location of the ground wire where the de-icing device needs to be installed, obtain the length and type of the ground wire on site, and then perform simulation modeling in mechanical simulation software based on the obtained ground wire parameters to analyze the frequency response characteristics of the ground wire.
[0104] like Figure 3 , Figure 4 As shown, it can be seen that when the ground wire vibration modes exhibit sinusoidal characteristics at 100th order (9.58Hz) and 200th order (18.43Hz), the vibration modes are as follows: Figure 5 As shown, when the vibration frequency is further increased to 300th order 24.77Hz, the ground wire waveform changes, exhibiting irregular vibration characteristics. Figures 3 to 5 The red areas in the sine wave indicate the points where the destructive stress and acceleration are greatest, which are most conducive to ice fracturing; from Figures 3 to 4 The changes revealed that as the vibration frequency increased, the red area increased, indicating a better effect on breaking up ice. However, this phenomenon did not continue indefinitely. When the vibration frequency increased to 300th order (24.77Hz), the ground wire waveform changed, exhibiting irregular vibration characteristics, and the red portion decreased, meaning that the effect on breaking up ice deteriorated. Therefore, in this embodiment, the optimal resonant frequency of the ground wire needs to be controlled below 300th order and below 24Hz.
[0105] Based on this, a harmonic response analysis was performed on the ground wire in this embodiment, and the analysis results are as follows:Figure 6 As shown; from Figure 6 As can be seen, the vibration applied to the ground wire in this embodiment will exhibit a sudden increase in amplitude at certain specific frequencies. Figure 6 The location marked by the red circle in the middle, Figure 6 The frequencies corresponding to the positions marked by the red circles are the optimal resonant points for de-icing. For ease of programming the controller 3 software, these frequencies can be selected... Figure 6 The frequencies corresponding to circle 1 and circle 2 are used as the optimal control frequencies. Circle 1 corresponds to 11.4Hz and circle 2 corresponds to 22.5Hz. These two data, 11.4Hz and 22.5Hz, are written into controller 3 as parameters for storage.
[0106] Since the icing conditions of the line during simulated harmonic response analysis are not entirely consistent with the actual icing conditions, it is necessary to control the two resonant points of vibration device 1 during de-icing. Figure 6 The positions of rings 1 and 2 are adjusted adaptively within a small range to find the true optimal resonant point. In this example, the fixed frequency adjustment step is set to 0.1 Hz / second.
[0107] like Figure 7 and Figure 8 As shown, in this embodiment, the vibration motor achieved full-line vibration of the 182-meter iced ground wire with an average power consumption of 240W, and caused a large area of ice removal on the iced line.
[0108] Importantly, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for rapid de-icing of overhead lightning protection ground line based on resonance principle, characterized in that: The method comprises the following steps: selecting an arbitrary position of the iced ground wire close to the iron tower as a deicing force application point; applying a set of external periodic vibration forces to the deicing force application point, so that the frequency of the external periodic vibration forces is close to the optimal resonant frequency inherent to the iced ground wire; vibrating the iced ground wire rapidly by continuously superimposing the external periodic vibration forces, so as to cause the ice layer on the iced ground wire to break and fall off.
2. The method according to claim 1, wherein: the number of the deicing force application frequency points is at least two groups, and the external periodic vibration forces are repeatedly changed among the at least two groups of deicing force application frequency points each time.
3. The overhead lightning protection ground line rapid de-icing method based on resonance principle according to claim 2, characterized in that: The frequency of the external periodic vibration forces is close to the optimal resonant frequency inherent to the iced ground wire, which comprises the following steps: obtaining parameter information of the target iced ground wire, including the length, model and maximum safe tension of the iron tower at both ends of the target iced ground wire; modeling the target iced ground wire based on the parameter information, and performing harmonic response frequency analysis based on modal analysis of the target iced ground wire; determining at least two groups of frequency points with the strongest vibration amplitude of the target iced ground wire as the optimal resonant frequency points based on the results of the harmonic response frequency analysis, and taking the frequencies of the two groups of optimal resonant frequency points as the reference for frequency control of the external periodic vibration forces.
4. The overhead lightning protection ground line rapid de-icing method based on resonance principle according to claim 3, characterized in that: The harmonic response frequency analysis based on the modal analysis of the target iced ground wire comprises the following steps: simulating the application of different vibration orders to the same position of the target iced ground wire to analyze the stress and amplitude characteristics of the target iced ground wire; simulating the application of periodic harmonic excitation forces to different positions of the target iced ground wire to analyze the amplitude response of different resonant points of the target iced ground wire.
5. A system for overhead lightning protection ground wire rapid deicing using the resonance principle-based overhead lightning protection ground wire rapid deicing method according to any one of claims 1 to 4, characterized in that: The system comprises: a vibration device (1) installed on the overhead lightning protection ground wire; an acceleration sensor (2) installed at a position between the vibration device (1) and a No. 1 tower; and a controller (3) connected to the vibration device (1) and the acceleration sensor (2) through a cable.
6. The system for overhead lightning protection ground wire rapid de-icing based on resonance principle according to claim 5, characterized in that: The system further comprises: a photovoltaic panel (4) installed on the sun side of the tower; and a power supply box (5) installed between the photovoltaic panel (4) and the tower; the power supply box (5) stores the power transmitted by the photovoltaic panel (4) and provides power supply for the controller (3), and the controller (3) supplies power to the vibration device (1) and the acceleration sensor (2).
7. The system according to claim 5 or 6, wherein: the vibration device (1) is installed on a hanging point on either side of the deicing point.
8. The system according to claim 7, wherein: the effective working vibration frequency range of the vibration device (1) is controlled within 7 Hz-26 Hz, and the minimum frequency adjustment range of the vibration device (1) is controlled within 0.1 Hz-0.3 Hz.