Intelligent ice melting method and system for ground wire of power transmission line

Abstract

According to the technical scheme, the power transmission line comprises a plurality of lines, and the method comprises the following steps: calculating the ice thickness prediction value of each ice melting section based on the real-time ice thickness prediction value of each ice melting section, the bearing capacity of a tower, the tension and crossing distance of a ground wire, and the load of a hardware fitting and an insulator; calculating the real-time icing safety degree of each ice melting section; sequencing all the ice melting sections according to the real-time icing safety degree of each ice melting section to form an ice melting sequence set, and selecting the ice melting section with the highest ice melting urgency degree according to the ice melting sequence set to execute ice melting operation; in the ice melting process, ice melting current is intelligently regulated and controlled according to real-time monitoring data, a fastest ice melting mode or a common ice melting mode is selected according to an external instruction, and three strategies of aggressive, balanced and conservative are further subdivided in different modes; according to the invention, efficient and safe ice melting operation can be realized under complex working conditions, and the operation reliability and the ice melting efficiency of the power transmission line are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmission lines, and particularly relates to an intelligent ice melting method and system for ground wires of transmission lines. Background Art

[0002] With the continuous growth of global energy demand, the operation safety and reliability of the power transmission system become particularly important. During the operation of long-distance transmission lines, due to complex climate conditions, icing of the lines occurs from time to time. Especially in extreme environments such as winter or mountainous areas, line icing may lead to line overload, mechanical structure damage, and even large-scale power outages. Therefore, how to efficiently and safely perform ice melting on transmission lines is an important technical challenge for the power grid to resist icing disasters.

[0003] Currently, the main features of the ice melting methods for transmission line ground wires are as follows: (1) Constant current ice melting Generally, ice melting of transmission lines is carried out by applying a constant direct current to the lines for heating, so that the surface temperature of the lines rises to the ice melting temperature. This constant current is an empirical current value under fixed meteorological conditions and cannot be dynamically adjusted according to the real-time working conditions of the lines, which is likely to result in the risk of unsuccessful ice melting due to insufficient current, too long ice melting time, or overheating of the ground wire due to too high current.

[0004] (2) Ice melting in divided sections Generally, the line is divided into several sections and ice melting operations are carried out section by section. However, the decision-making for section switching often relies on manual judgment and lacks a systematic method for evaluating the urgency of ice melting.

[0005] (3) Ice melting based on online monitoring Existing ice melting technologies introduce online monitoring devices, which provide ice melting references by collecting data such as ambient temperature, ice thickness, and ground wire temperature. However, these methods are only limited to monitoring and recording data and do not directly associate the monitoring data with ice melting strategies, resulting in ice melting decisions still mainly based on fixed rules and failing to fully utilize real-time monitoring information to optimize ice melting operations.

[0006] (4) Single ice melting strategy The current ice melting technology strategy is to use a constant current for ice melting to ensure that the temperature of the ground (conducting) wire does not exceed the maximum allowable temperature. There is no adoption of advanced ice melting strategies and a lack of comprehensive optimization capabilities for multiple lines and multiple working conditions.

[0007] Although the existing technologies have made certain progress in the field of transmission line ice melting, there are still the following technical problems: (1) Lack of dynamic adaptive ice melting current control The deicing current of existing deicing technologies is usually a preset constant value or an empirical value, and it cannot be adjusted dynamically in real time according to different environmental conditions and ice coating thicknesses, resulting in low deicing efficiency or potential safety hazards.

[0008] (2) Lack of systematic index evaluation for deicing decision-making When existing deicing technologies select deicing lines or optimize deicing sequences, there is a lack of a comprehensive safety index evaluation system. For example, key factors such as tower bearing capacity, conductor and ground wire tension, cross-span distance, and ultimate loads of fittings and insulators are not systematically considered, and the judgment of deicing priority mainly relies on manual experience.

[0009] (3) Insufficient efficiency of multi-line collaborative deicing In a multi-line operating environment, existing methods usually cannot effectively distinguish the urgency of different lines during the deicing process, lack a multi-line collaborative deicing optimization strategy based on real-time monitoring data, and may lead to uneven resource allocation or unreasonable deicing sequences.

[0010] (4) Inflexible switching of deicing strategies During deicing operations, different deicing strategies can be adopted for different working conditions (such as large ice coating thickness and harsh environmental conditions). However, existing deicing technologies are insufficient in strategy switching, unable to flexibly switch different deicing modes such as conservative, balanced, and aggressive according to real-time data, which is likely to lead to improper operations or resource waste. Summary of the Invention

[0011] The purpose of the present invention is to solve the deficiencies existing in the above-mentioned background technology, and provide an intelligent deicing method and system for the ground wire of a transmission line, which can achieve efficient and safe deicing operations under complex working conditions, and significantly improve the operation reliability and deicing efficiency of the transmission line.

[0012] The technical solution adopted by the present invention is: an intelligent deicing method for the ground wire of a transmission line, the transmission line includes multiple lines, and the method includes the following steps: Based on the predicted values of the real-time ice coating thickness, tower bearing capacity, conductor and ground wire tension, cross-span distance, and loads of fittings and insulators in each deicing section, calculate the real-time ice coating safety degree of each deicing section; Sort all deicing sections according to the real-time ice coating safety degree of each deicing section to form a deicing sequence set, and select the deicing section with the highest deicing urgency in the deicing sequence set to perform deicing operations: Select the fastest deicing mode or the normal deicing mode according to an external instruction. Both the fastest deicing mode and the normal deicing mode include an aggressive deicing strategy, a balanced deicing strategy, and a conservative deicing strategy in which the deicing current values are distributed in sequence from small to large. Switch the corresponding deicing mode or deicing strategy according to the current deicing constraint conditions of the deicing section; adjust the deicing current according to the monitoring data of the deicing section.

[0013] In the above technical solution, monitoring points are arranged at three or more tower positions that are most prone to icing and three or more tower positions that are least prone to icing on each ice melting section, for monitoring environmental temperature, ground wire temperature, wind speed, and ice thickness.

[0014] In the above technical solution, the calculation process of the current ice melting safety degree of any ice melting section includes: first, using the analytic hierarchy process to calculate the risk weight coefficients of ice thickness, tower poles, (conductors) ground wires, fittings, and insulators, and then calculating the ratio of the predicted value of the current ice thickness to its limit value, the ratio of the bearing capacity of the tower pole to its limit value, the ratio of the tension and cross-span distance of the conductor and ground wire to their limit values, the ratio of the load of the fittings to its limit value, and the ratio of the load of the insulator to its limit value for each monitoring point in this ice melting section. Finally, according to the maximum value of each type of ratio and the corresponding weight, the ice melting safety index of this ice melting section is calculated.

[0015] In the above technical solution, only the ice melting sections where the predicted value of the current ice thickness reaches the set threshold within the set time are added to the ice melting sequence set.

[0016] In the above technical solution, the ice melting strategy switching process in the fastest ice melting mode includes: First, execute the conservative ice melting strategy: take the smaller value between the minimum value of the maximum full-ice melting current of all monitoring points and the minimum value of the maximum non-full-ice melting current as the ice melting current; this ice melting current should be greater than the minimum value of the minimum ice melting current of all monitoring points, otherwise jump to the balanced strategy; Balanced ice melting strategy: take the smaller value between the average value of the maximum full-ice melting current of all monitoring points and the minimum value of the maximum non-full-ice melting current as the ice melting current; this ice melting current should be greater than the minimum value of the minimum ice melting current of all monitoring points, otherwise jump to the aggressive strategy; Aggressive strategy: take the smaller value between the maximum value of the maximum full-ice melting current of all monitoring points and the minimum value of the maximum non-full-ice melting current as the ice melting current; this ice melting current should be greater than the minimum value of the minimum ice melting current of all monitoring points, otherwise prompt that the ice melting cannot be completed.

[0017] In the above technical solution, the ice melting strategy switching process in the normal ice melting mode includes: First, execute the conservative ice melting strategy: take the smaller value between the minimum value of the remaining time ice melting current of all monitoring points and the minimum value of the maximum non-full-ice melting current as the ice melting current; this ice melting current should be greater than the minimum value of the minimum ice melting current of all monitoring points, otherwise jump to the balanced strategy; Balanced ice melting strategy: Take the smaller value between the average of the remaining-time ice melting currents of all monitoring points and the minimum of the maximum non-full-ice-coverage ice melting currents as the ice melting current; this ice melting current should be greater than the minimum of the minimum ice melting currents of all monitoring points, otherwise jump to the aggressive strategy; Aggressive strategy: Take the smaller value between the maximum of the remaining-time ice melting currents of all monitoring points and the minimum of the maximum non-full-ice-coverage ice melting currents as the ice melting current; this ice melting current should be greater than the minimum of the minimum ice melting currents of all monitoring points, otherwise jump to the fastest ice melting mode.

[0018] In the above technical solution, the ice melting operation process of any ice melting section includes: All monitoring points in this ice melting section detect in real time whether the temperature of the ground (conductor) wire is less than the set limit value; if so, this ice melting section continues to perform ice melting operation according to the ice melting current of the current strategy, otherwise the ice melting current is reduced under the current strategy.

[0019] In the above technical solution, the ice melting operation process of any ice melting section further includes: When the ice coating thicknesses of all monitoring points in this ice melting section reach the set target value, the ice melting operation of this ice melting section ends.

[0020] In the above technical solution, the remaining-time ice melting current I of any monitoring point R is calculated using the following formula: ; where D represents the outer diameter of the ground wire after ice coating, d represents the outer diameter of the ground wire, g0 represents the specific gravity of ice, b represents the ice coating thickness, △t represents the difference between the ground wire temperature and the ambient air temperature, T R represents the remaining time, R T0 represents the equivalent thermal resistance of the ice layer conduction, R T1 represents the equivalent thermal resistance of convection and radiation, and R0 represents the resistance of the ground wire at 0°C air temperature.

[0021] The present invention provides an intelligent ice melting system for the ground wire of a transmission line. The transmission line includes multiple lines, including: An ice coating safety index calculation module, used to calculate the real-time ice coating safety degree of each ice melting section based on the real-time predicted ice coating thickness, tower bearing capacity, conductor and ground wire tension, crossing distance, and loads of fittings and insulators in each ice melting section; An ice melting sequence set generation module, used to sort all ice melting sections according to the real-time ice coating safety degree of each ice melting section to form an ice melting sequence set, and select the ice melting section with the highest ice melting urgency to perform ice melting operation; An ice melting operation module. The ice melting process for any ice melting section includes: Select to execute the fastest ice melting mode or the normal ice melting mode; Both the fastest ice melting mode and the normal ice melting mode include an aggressive ice melting strategy, a balanced ice melting strategy, and a conservative ice melting strategy in which the ice melting current values are distributed in a generally decreasing order. The corresponding ice melting strategy is selected or the ice melting mode is switched according to the current ice melting current constraint conditions in the ice melting section.

[0022] The beneficial effects of the present invention are as follows: Based on the historical and real-time data of the on-line monitoring device, the ice accretion growth rate of the ground wire of the transmission line is predicted, so as to obtain the predicted ice thickness values of each ice melting section; the ice accretion safety degree is calculated based on the real-time data of each ice melting section to form an ice melting sequence set, the urgent line is selected for ice melting operation, and the normal mode and the fastest mode are distinguished, and the ice melting operation is carried out in combination with the dynamic ice melting strategy. The present invention sorts based on the real-time ice accretion safety degree to ensure that the line with the highest ice accretion urgency is preferentially melted, improving the resource allocation efficiency. Select the normal mode or the fastest mode according to external instructions to adapt to different working conditions (such as emergencies or planned operations). Combining the aggressive, balanced and conservative strategies can balance the ice melting speed and equipment safety and improve the adaptability of the operation.

[0023] Further, the present invention arranges monitoring points at 3 or more tower positions on the ground wire line that are most prone to icing and least prone to icing, monitors the ambient temperature, ground wire temperature, wind speed and ice thickness, and by arranging at the key positions that are most prone to icing and least prone to icing, it is ensured that the data of the monitoring points can represent the overall working conditions of the line. Multi-point monitoring can obtain more comprehensive environmental and equipment status data, support more accurate current adjustment and strategy switching, and real-time monitoring provides a dynamic data basis under multiple working conditions to support the adjustment of ice melting current and strategy.

[0024] Further, when the present invention calculates the ice accretion safety degree, it comprehensively considers the ice thickness, tower bearing capacity, conductor and ground wire tension, crossing distance, loads of fittings and insulators and their limit values, and calculates the index value in combination with weights; considering multiple factors, the safety risk of each ice melting section is quantified to avoid deviations that may be caused by a single index judgment; sorting is carried out based on the comprehensive safety index to ensure that high-risk sections are preferentially melted, improving the overall safety; real-time index calculation supports rapid evaluation and adjustment under different working conditions to adapt to complex operating environments.

[0025] Further, only the lines whose predicted current ice thickness values reach the set threshold within the set time are added to the ice melting sequence set; the sections that do not meet the threshold conditions are excluded to ensure that the ice melting resources are concentrated on the urgent line sections; the scale of the ice melting sequence set is reduced through pre-screening to reduce the calculation and scheduling complexity; the ice melting operation combines the prediction data to determine the ice melting line in advance and optimize the ice melting decision.

[0026] Furthermore, in the fastest ice melting mode of the present invention, the ice melting current (conservative, balanced, aggressive) is adjusted according to the current strategy switching logic; it supports dynamic switching between different strategies to adapt to the real-time changes of equipment temperature, ice melting progress, and safety constraints; through the strategy switching mechanism, it avoids equipment damage or temperature overlimit caused by excessive current, ensuring the safety of ice melting operations; the aggressive strategy preferentially uses the maximum load-bearing capacity of the equipment to accelerate the ice melting process.

[0027] Furthermore, in the normal ice melting mode of the present invention, according to the remaining time ice melting current adjustment strategy, the conservative, balanced, and aggressive modes are switched; in the normal mode, the current value is dynamically adjusted based on the remaining time ice melting current to ensure that the ice melting task is completed as planned; in the normal mode, unnecessary energy consumption is reduced by gradually decreasing the current (such as the conservative ice melting strategy); it also supports the strategy switching mechanism to adapt to the requirements of complex working conditions.

[0028] Furthermore, during the ice melting operation of any ground wire line of the present invention, the ground wire temperature at all monitoring points is monitored in real time, and the current or strategy is adjusted according to the temperature limit value; through monitoring and real-time adjustment, it prevents the ground wire temperature from exceeding the allowable value designed for the equipment, protecting the equipment from damage; according to the real-time temperature feedback, the current is dynamically adjusted or the strategy is switched to improve the ice melting efficiency and safety; it avoids the degradation of the mechanical properties of the ground wire caused by long-term high temperature.

[0029] Furthermore, when the ice thickness at all monitoring points of a certain ground wire line reaches the set target value, the ice melting operation of this line is automatically ended; without manual intervention, the system can automatically end the ice melting according to the target, saving manpower; it ensures that the ice melting current is timely turned off after reaching the target, avoiding the equipment running at high temperature or high current for a long time; after the ice melting operation is ended in a timely manner, the system can transfer resources to other lines to optimize the overall efficiency.

[0030] Furthermore, the present invention calculates the remaining time ice melting current of any monitoring point based on parameters such as the outer diameter of the ground wire ice coating and the temperature difference; the remaining time ice melting current is accurately calculated based on the thermodynamics and electrical models to ensure that the ice melting current value is reasonable; through the control of the remaining time current, it ensures that neither time is wasted nor equipment is damaged; considering real-time parameters such as the outer diameter of the ice coating and temperature, it adapts to various operating conditions and improves the ice melting effect. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the method flow of the present invention; Figure 2 It is a flow chart of the ice melting strategy switching of the present invention; Figure 3 It is the software application interface a of a specific embodiment; Figure 4 It is the software application interface b of a specific embodiment; Figure 5 Software application interface c for specific embodiments. Specific implementation manners

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, which is convenient for clearly understanding the present invention, but they do not limit the present invention.

[0033] Embodiment 1 As Figure 1 shown, the present invention provides an intelligent ice melting method dedicated to the ground wire in a transmission line. The ground wire in the transmission line not only undertakes important functions such as lightning protection and shielding, but also has a particularly significant impact on the system safety in an icing environment. Therefore, all ice melting steps of the present invention are designed according to the actual working conditions of the ground wire, and the specific steps include: 1. Prediction of ice thickness Based on the historical and real-time data collected by the on-line monitoring device, the ice growth rate of the ground wire of the transmission line is predicted, so as to obtain the estimated ice thickness value of each ice melting section.

[0034] 2. Calculation of real-time ice covering safety degree Using the real-time ice thickness prediction values of each ice melting section, and combining with key parameters such as tower bearing capacity, conductor and ground wire tension, crossing distance, and loads of fittings and insulators, calculate the real-time ice covering safety degree of each ice melting section, and focus on evaluating the safe operation status of the ground wire in the icing state.

[0035] 3. Formation and selection of ice melting sequence Sort all the ground wire ice melting sections according to the real-time ice covering safety degree to form a set of ice melting sequences, and select the section with the lowest safety degree (i.e., the highest ice melting urgency) for ice melting operation according to the preset number of urgencies.

[0036] 4. Intelligent regulation of ice melting current and strategy switching During the ice melting process, intelligently regulate the ice melting current according to the real-time monitoring data; select the fastest ice melting mode or the normal ice melting mode according to external instructions. Whether it is the fastest or the normal mode, the ice melting current values are distributed in ascending order according to the aggressive, balanced, and conservative ice melting strategies, and are automatically switched according to the current ice melting requirements of the ground wire to ensure that the operation is both efficient and safe.

[0037] An ice melting section refers to an independent operation unit that is continuous and has similar working conditions and is divided from the entire line according to the geographical environment, structural characteristics, and real-time monitoring data (such as indicators such as ice thickness, tower bearing capacity, conductor and ground wire tension, crossing distance, and loads of fittings and insulators) during the ice melting operation of the transmission line. Each ice melting section is used as a separate object for safety evaluation and ice melting operation, so as to achieve precise, dynamic, and targeted ice layer removal and ensure the safety and stability of the line operation.

[0038] The principle of the present invention will be further described below in conjunction with specific embodiments.

[0039] Based on the historical and real-time data of the on-line monitoring device, this embodiment uses a machine learning model for predicting the icing of transmission lines. This embodiment adopts the technical solution described in the patent application with the application number 202311669638X and the invention creation name of "Overhead Line Icing Thickness Prediction Method and System" to predict the icing of the ground wire of the transmission line.

[0040] Based on the characteristics of the transmission line, this embodiment constructs a hierarchical structure model for evaluating the icing safety degree of the transmission line, aiming to systematically evaluate the influence of each factor on the overall safety degree of the line.

[0041] The target layer of the hierarchical structure model is the evaluation of the icing safety degree of the transmission line, the criterion layer is the icing thickness, tower pole, ground wire, hardware fittings and insulators, and the scheme layer is the tower poles corresponding to each section of the line for evaluation.

[0042] The main objective of the evaluation is the icing safety degree of the transmission line. This is the highest layer of the entire hierarchical structure model, representing the ultimate goal of the decision-making. The criterion layer is the next layer of the target layer, including several key factors that have a greater impact on the icing safety degree of the transmission line. The scheme layer lists the specific schemes to be evaluated on the basis of the criterion layer, that is, the tower poles of each transmission line. Each tower pole is a specific decision-making scheme that needs to be compared in the evaluation. According to the above determined objectives, criteria and schemes, a hierarchical structure diagram is drawn to clearly show the relationship between each layer.

[0043] Specifically, the safety indicators set in this embodiment are as follows: 1. Icing thickness index I 覆冰 : Evaluate the ratio of the currently predicted icing thickness of the line to the designed icing thickness, reflecting the relative degree of the icing load of the line. This ratio indicates that the icing thickness within the future specified time reaches or exceeds the designed value, and at this time the line faces higher risks. This index directly characterizes the future icing degree of the line and can quickly reflect the urgency of the ice melting requirement.

[0044] 2. Tower pole bearing capacity index: Evaluate the bearing capacity of the tower pole under icing and specific working conditions (such as accident, normal, uneven icing working conditions) to ensure its structural safety.

[0045] ① Accident (broken wire) working condition Check the tower pole according to the load conditions of the static load (horizontal, vertical load), tension and broken wire tension difference of the iron tower under different ice thickness conditions. The ice area is determined according to the change of the icing thickness. The load combination coefficient of the broken wire working condition is considered as 0.9, and determine the minimum icing thickness at which the tower pole exceeds the bearing capacity.

[0046] ; Wherein, N 杆塔 represents the current stress of the pole tower, N 极限,断线 represents the ultimate bearing capacity of the pole tower under the broken wire condition.

[0047] ② Uneven ice coating condition Check the pole tower according to the load conditions of the static load (horizontal and vertical loads), tension of the iron tower and the unbalanced tension under the uneven ice coating condition under different ice thickness conditions. The ice area is determined according to the change of ice thickness. The load combination coefficient under the uneven ice coating condition is considered as 0.9, and determine the minimum ice thickness when the pole tower exceeds its bearing capacity.

[0048] ; Wherein, N 极限,不均匀 represents the ultimate bearing capacity of the pole tower under the uneven condition.

[0049] ③ Under the normal ice coating condition Check the pole tower according to the load conditions of the static load (horizontal and vertical loads), tension of the iron tower, the tension difference under the actual span and terrain conditions under different ice thickness conditions. The ice area is determined according to the change of ice thickness. The load combination coefficient under the ice coating condition is considered as 1.0, and determine the minimum ice thickness when the pole tower exceeds its bearing capacity.

[0050] a. The structural importance coefficient is considered as 1.0 when calculating the load capacity of the ground wire support and the main / diagonal members of the iron tower.

[0051] b. Determine the ice area according to the ice thickness according to the principle of taking the higher value. For example, if the ice thickness is 12mm, it is considered according to the ice area of 15mm in Category I. The combination of the broken wire condition, the uneven ice coating condition and the calculation parameters related to the ice area are determined according to the corresponding codes and specifications for different ice areas.

[0052] ; Wherein, N 极限,正常 represents the ultimate bearing capacity of the pole tower under the normal condition.

[0053] Comprehensive bearing capacity index value of the pole tower: I 杆塔 = max(I 杆塔,断线 , I 杆塔,不均匀 , I杆塔,正常 ) Conductor and ground wire tension and cross-span distance index: Evaluate whether the tension and cross-span distance of the conductor and ground wire under ice coating conditions meet the safety requirements.

[0054] ① Conductor and ground wire tension check index: Take 90% of 95% of the designed breaking strength (rated breaking strength) of the conductor and ground wire as the over-limit tension of the conductor and ground wire caused by ice coating, and evaluate whether the tension of the conductor and ground wire under ice coating conditions exceeds its limit value.

[0055] ; Among them, I 张力 Indicates the ground wire tension calibration index; T 当前 Indicates the current tension of the ground conductor under ice conditions; T 极限 Indicates the maximum allowable tension of the ground wire, which is defined as 90% of the designed breaking force. 张力 ≥1 indicates that the ground wire tension exceeds the limit requirement. This indicator is used to determine whether ice coverage causes the tension to exceed the limit and to verify the safety of the line.

[0056] ② Insufficient crossing distance index: Considering the entire line to be evenly covered with ice, the sag under high temperature sag is calculated under icing conditions as the limit crossing verification condition for insufficient crossing distance, to evaluate whether the ground wire meets the crossing safety requirements under high temperature icing sag conditions.

[0057] ; Among them, I 交跨 Indicates the insufficient cross-span distance indicator; H high temperature sag refers to the high temperature sag of the ground conductor under ice cover; H 极限 Indicates the maximum distance of the conductor to the ground or the crossover.

[0058] When I 交跨 ≥1 indicates that the crossing distance is insufficient and there may be a line safety risk. This indicator is used to assess whether the ground wire has excessive sag due to ice covering, affecting the safety of the line crossing area or ground equipment.

[0059] Hardware Load Index I 金具 :Evaluate whether the load on the hardware exceeds its design limit under icing conditions.

[0060] ;

[0061] L 当前 Indicates real-time hardware load; L 极限 It represents 90% of the rated breaking load of the fittings.

[0062] The hardware load index directly reflects the mechanical load risk caused by icing. 金具 When ≥1, the hardware is at risk of damage.

[0063] Insulator load index: Evaluate whether the load on the insulator under icing conditions exceeds its design limit: ;

[0064] L当前 Indicates the real-time insulator load; L 极限 Indicates 90% of the rated breaking load of the insulator. Similar to the fitting hardware index, the insulator load index is used to judge its mechanical safety. When I 绝缘子 ≥1, there is a greater risk of damage to the insulator.

[0065] For each pair of factors in the criterion layer and the scheme layer, pairwise comparison is required to form a comparison judgment matrix. The decision maker needs to fill in the relative weights in the comparison matrix according to their subjective judgment and professional knowledge. This step can quantify the importance between different factors and provide a data basis for subsequent calculations. Through brainstorming and expert scoring, the judgment matrix of the criterion layer is obtained. B1 - B5 respectively represent the above 5 evaluation indicators, as shown in Table 1: Table 1 Judgment Matrix A B1 B2 B3 B4 B5 B1 1 3 5 7 7 B2 1 / 3 1 2 3 3 B3 1 / 5 1 / 2 1 2 2 B4 1 / 7 1 / 3 1 / 2 1 1 B5 1 / 7 1 / 3 1 / 2 1 1 Perform column normalization on the judgment matrix of the criterion layer to obtain the normalized matrix of the judgment matrix of the criterion layer as shown in Table 2.

[0066] Table 2 Normalized Matrix of the Judgment Matrix of the Criterion Layer A B1 B2 B3 B4 B5 B1 0.54973822 0.580645 0.555556 0.5 0.5 B2 0.183246073 0.193548 0.222222 0.214286 0.214286 B3 0.109947644 0.096774 0.111111 0.142857 0.142857 B4 0.078534031 0.064516 0.055556 0.071429 0.071429 B5 0.078534031 0.064516 0.055556 0.071429 0.071429 Calculate the row sum and then perform column normalization to obtain the weight vector (eigenvector) as shown in Table 3.

[0067] Table 3 Eigenvector Table A Matrix after row sum Eigenvector B1 2.685938937 0.537188 B2 1.027588111 0.205518 B3 0.603547234 0.120709 B4 0.341462859 0.068293 B5 0.341462859 0.068293 The weight vector (eigenvector) w is: (0.537, 0.206, 0.121, 0.068, 0.068) T , reflecting the importance of each factor in the criterion layer relative to the goal.

[0068] Multiply the judgment matrix A by the eigenvector w to obtain: Aw = (2.713, 1.036, 0.604, 0.342, 0.342) T Since Aw = λ max w, the maximum eigenvalue can be calculated as: λ max = (2.713 / 0.537188, 1.036 / 0.205518, 0.604 / 0.120709, 0.342 / 0.068293, 0.342 / 0.068293) / 5 = 5.023 To avoid interference from other factors to the judgment matrix, the analytic hierarchy process needs to conduct a consistency test on the judgment matrix. The so-called consistency test refers to determining the allowable range of inconsistency for A. Among them, the only non-zero eigenvalue of an n-order consistent matrix is n, and the largest eigenvalue λ of an n-order positive reciprocal matrix A max ≥n, and A is a consistent matrix if and only if λ max =n. Since λ max depends continuously on a ij , then the more λ max exceeds n, the more serious the inconsistency of A. The consistency index is calculated by CI. The smaller CI is, the greater the consistency. Using the eigenvector corresponding to the largest eigenvalue as the weight vector of the influence degree of the compared factors on a certain upper-level factor, the greater its inconsistency, the greater the judgment error caused. Therefore, the magnitude of the value of λ max -n can be used to measure the inconsistency degree of A.

[0069] ; CR < 0.1, and the judgment matrix of the criterion layer passes the consistency test, indicating that the consistency degree of the judgment matrix A is considered within the allowable range. At this time, the eigenvector of A can be used to calculate the weight vector.

[0070] To sum up, the calculated weight coefficients of each risk factor are shown in Table 4.

[0071] Table 4 List of Risk Factor Weights

[0072] The comprehensive weight of the ice coating thickness is 53.7%, which is the most important risk factor; the comprehensive weights of the tower and the ground wire both exceed 10%, which are the second most important risk factors; the comprehensive weights of the fittings and insulators are both less than 10%, which are general risk factors.

[0073] To construct a unified safety evaluation system, it is recommended to consider the specific load ratio of each influencing factor to the design boundary conditions or the ultimate load-bearing capacity of the equipment as a sub-index for evaluation, as shown in Table 5: Table 5 Risk Factors

[0074] When evaluating the safety index of a single de-icing section, multiple monitoring points with relatively harsh operating conditions should be selected for safety assessment. The calculation formula for the ice coating safety index of a single de-icing section is as follows: ; Among them, S is the ice coating safety index of a single de-icing section; i is the i-th monitoring point within a single de-icing section; k Iis the line importance coefficient. For example, for UHV lines, it can be taken as 1.25, and for EHV lines, it can be taken as 1.0. The icing safety index score can be used to obtain the risk quantification value. The higher the comprehensive score, the greater the urgency of de-icing considering the five indicators.

[0075] The risk factors at each monitoring point should match. For example, with the tower as the center, the ground wire should be the ordinary ground wire or OPGW on the front and back sides of the tower, the fittings and insulators should be the ground wire strings on the tower under study, and the icing value should be the monitored or deduced value at the tower location or the adjacent spans.

[0076] In this embodiment, the order of de-icing the ground wire comprehensively considers the development of icing and the urgency of de-icing of multiple lines.

[0077] First, according to the predicted icing development of the line, i.e., the icing safety index, the line is added to the ground wire de-icing sequence; within the de-icing sequence, the urgency of de-icing of multiple sections, i.e., the size of the icing safety index score, is judged, sorted from largest to smallest according to the icing safety index score, and a de-icing order decision is made. The lines with the highest rankings are selected according to the preset quantity for de-icing operations. The de-icing sequence and its order change in real time, and the corresponding de-icing current also changes.

[0078] Comprehensively considering the decision-making process of de-icing and the time required for ground wire de-icing, it is recommended to use the icing thickness of the line reaching the design icing thickness within 5 hours as the start threshold for the line to be added to the de-icing sequence set. The de-icing sequence set is dynamically adjusted based on the predicted icing conditions of the de-icing-capable lines.

[0079] In this embodiment, the fastest de-icing mode calculates the maximum and minimum de-icing currents according to the "Technical Specification for DC De-icing System Design" (DL / T 5511-2016). The de-icing current should be selected between the minimum de-icing current and the maximum de-icing current in combination with the de-icing time. When the de-icing current is less than the minimum de-icing current, the de-icing will be ineffective; when the de-icing current is greater than the maximum de-icing current, the ground wire will undergo permanent deformation, resulting in an increase in sag or damage to the mechanical strength of the ground wire.

[0080] The minimum de-icing current refers to the minimum current required to melt the icing on the ground wire under the corresponding ambient air temperature and wind speed conditions. The actual de-icing current should be greater than the minimum de-icing current.

[0081] The minimum de-icing current adopts the Bülsdorff calculation formula: ; where: I min —— the minimum de-icing current (A); △t—— the difference between the ground wire temperature and the ambient air temperature (°C). When the icing ambient temperature is -5°C and the non-icing temperature of the ground wire is 2°C, △t is taken as 7°C; R T0—— Equivalent thermal resistance of ice layer conduction (℃·cm / W); R T1 —— Equivalent thermal resistance of convection and radiation (℃·cm / W); R0 —— Resistance of the ground wire at 0℃ (Ω / m), R0 = R 20 (1 - 20α), where R 20 is the resistance of the ground wire at 20℃ (Ω / m); α is the temperature coefficient of resistance of the ground wire (1 / ℃), taking 0.00403 for aluminum stranded wire and aluminum conductor steel-reinforced wire, 0.00347 for aluminum alloy stranded wire and aluminum alloy conductor steel-reinforced wire, 0.00366 for aluminum-clad steel stranded wire, and 0.0046 for galvanized steel stranded wire; D —— Outer diameter of the ground wire after icing (cm); d —— Outer diameter of the ground wire (cm); λ b —— Thermal conductivity of ice [W / (℃·cm)], taking 0.0227 for glaze and 0.0012 for rime; V —— Synchronous wind speed during de-icing (m / s), taking 3 m / s to 5 m / s.

[0082] For non-full-line icing lines, or when the icing distribution on the de-icing section is uneven, the maximum de-icing current of the ground wire can be calculated by the following formula: ; In the formula: I max —— Maximum de-icing current (A); W R —— Radiation heat dissipation power of the ground wire (W / m); W F —— Convection heat dissipation power of the ground wire (W / m); W S —— Solar radiation heat absorption power of the ground wire (W / m); R m —— Resistance of the ground wire at the allowable temperature (Ω / m); E 1 —— Radiation heat dissipation coefficient of the ground wire surface, preferably taking 0.9; S 1 —— Stefan-Boltzmann constant, taking 5.67×10 -8 (W / m 2 ); D 1 —— Outer diameter of the ground wire (m); t m —— Allowable temperature of the ground wire (℃); t —— Ambient air temperature (℃), preferably taking 10℃ to 15℃; λ f——Heat transfer coefficient of the air on the surface of the ground wire [W / (m·℃)]; R e ——Reynolds number; α s ——Heat absorption coefficient of the ground wire surface, preferably taken as 0.9; J s ——Sunshine intensity of sunlight on the ground wire, preferably taken as 900 W / m 2 .

[0083] For the entire line with ice coating, the maximum de-icing current of the ground wire can be calculated by the following formula: ; In the formula: ε n ——Ice layer radiation coefficient, 0.64 for glaze and 0.32 for rime; t ——Ambient air temperature (℃), preferably taken as -3℃ to -5℃.

[0084] When calculating the maximum de-icing current, the allowable temperature of the ground wire should preferably comply with the provisions of Table 6: Table 6 Allowable temperature values of ground wires of different models

[0085] The magnitude of the DC de-icing voltage is mainly related to the ground wire resistance and the de-icing current, and shows a linear relationship. Under the condition of neglecting the internal resistance of the de-icing device and considering the infinite impedance of the ground wire to the ground, it can be known that the de-icing voltage and the de-icing current follow Ohm's law, then the de-icing voltage is calculated by the following formula: ; In the formula: U R ——De-icing voltage (kV); P——De-icing capacity (kV); I R ——Actual de-icing current (kA); R 20 ——Resistance of the wire or ground wire in the de-icing circuit at 20℃ (Ω / km); L ——Length of the ground wire (km); n ——Number of splits.

[0086] Given the magnitude of the de-icing current, the formula for calculating the de-icing time is as follows: ; In the formula: T R ——De-icing time (h); g0——Specific gravity of ice (g / cm3), 0.9 for glaze and 0.3 for rime; b —— Ice thickness (cm).

[0087] In this embodiment, for each ice melting section, icing on-line monitoring devices are arranged at three or more tower positions that are most prone to icing and least prone to icing to monitor data such as ambient temperature, ground wire temperature, wind speed, and ice thickness. The parameters are named t Hi , t Di , v Hi , D Hi (i is the i-th monitoring device).

[0088] Since the ice melting time can be set according to external instructions in this embodiment, during the ice melting operation, for the remaining time ice melting current I at any monitoring point R is calculated using the following formula: ; where D represents the outer diameter of the ground wire after icing, d represents the outer diameter of the ground wire, g0 represents the specific gravity of ice, b represents the ice thickness, △t represents the difference between the ground wire temperature and the ambient air temperature, T R represents the remaining time, R T0 represents the equivalent thermal resistance of the ice layer conduction, R T1 represents the equivalent thermal resistance of convection and radiation, and R0 represents the resistance of the ground wire at 0°C air temperature.

[0089] After starting ice melting, calculate the ice melting current based on the monitoring data of the ice-prone section, check whether the ice melting current is within the limit (the ground wire current-carrying capacity of the non-ice-prone section), and whether the ground wire temperature is within the limit. Adjust the ice melting current at a fixed time step. When the monitored ice thickness is less than the target value, the ice melting ends.

[0090] As Figure 2 shown, the real-time regulation strategy of the ice melting current is as follows: (1) Calculate the ice melting current in real time According to the on-line monitoring data of all monitoring points in the ice melting section where the current ice melting operation is being performed, calculate the m-hour ice melting current at the i-th monitoring point to obtain I hi ; calculate the minimum ice melting current to obtain I mini ; calculate the maximum ice melting current for full icing to obtain I Qmaxi ; calculate the maximum ice melting current for non-full icing to obtain I FQmaxi . If the icing value at the monitoring point is greater than 0, do not calculate the maximum ice melting current for non-full icing.

[0091] The user selects the fastest ice melting mode or the m-hour ice melting mode (i.e., the ordinary ice melting mode) according to the demand. Under different ice melting modes, different ice melting strategies can be selected as needed: 1) Fastest ice melting mode a. Aggressive ice melting strategy According to the on-line monitoring data, calculate the minimum value of the minimum de-icing current at all monitoring points (MIN{I mini}), the maximum value of the maximum full-ice-covered de-icing current ((MAX{I Qmaxi}), the minimum value of the maximum non-full-ice-covered de-icing current ((MIN{I FQmaxi}), and take the smaller value between MAX{I Qmaxi} and MIN{I FQmaxi} as the de-icing current. This de-icing current should be greater than MIN{I mini}, otherwise the allowed de-icing current is less than the minimum de-icing current and de-icing cannot be completed.

[0092] b. Balanced de-icing strategy According to the on-line monitoring data, calculate the minimum value of the minimum de-icing current at all monitoring points (MIN{I mini}), the average value of the maximum full-ice-covered de-icing current ((AVERAGE{I Qmaxi}), the minimum value of the maximum non-full-ice-covered de-icing current ((MIN{I FQmaxi}), and take the smaller value between AVERAGE{I Qmaxi} and MIN{I FQmaxi} as the de-icing current. This de-icing current should be greater than MIN{I mini}, otherwise it is prompted that de-icing cannot be performed under the current strategy, and it can automatically jump to the aggressive strategy for judgment.

[0093] c. Conservative mode According to the on-line monitoring data, calculate the minimum value of the minimum de-icing current at all monitoring points (MIN{I mini}), the minimum value of the maximum full-ice-covered de-icing current ((MIN{I Qmaxi}), the minimum value of the maximum non-full-ice-covered de-icing current ((MIN{I FQmaxi}), and take the smaller value between MIN{I Qmaxi} and MIN{I FQmaxi} as the de-icing current. This de-icing current should be greater than MIN{I mini}, otherwise it is prompted that de-icing cannot be performed under the current strategy, and it can automatically jump to the balanced strategy for judgment.

[0094] 2) m-hour de-icing mode a. Aggressive de-icing strategy According to the on-line monitoring data, calculate the minimum value of the minimum de-icing current at all monitoring points (MIN{I mini}), the maximum value of the de-icing current at (m - de-icing time) hours ((MAX{I hi}), the minimum value of the maximum non-full-ice-covered de-icing current ((MIN{I FQmaxi}), take the smaller value of MAX{I hi} and MIN{I FQmaxi} as the de-icing current, and this de-icing current should be greater than MIN{I mini}, otherwise the allowed de-icing current is less than the minimum de-icing current and the m-hour de-icing cannot be completed, and it can automatically jump to the fastest de-icing mode.

[0095] b. Balanced de-icing strategy According to the on-line monitoring data, calculate the minimum value of the minimum de-icing current of all monitoring points (MIN{I mini}), the average value of the de-icing current for (m - de-icing time elapsed) hours (AVERAGE{I hi}), and the minimum value of the maximum non-full-ice-covering de-icing current (MIN{I FQmaxi}). Take the smaller value of AVERAGE{I hi} and MIN{I FQmaxi} as the de-icing current, and this de-icing current should be greater than MIN{I mini}, otherwise it is prompted that de-icing cannot be performed under the current strategy, and it can automatically jump to the aggressive strategy for judgment.

[0096] c. Conservative mode According to the on-line monitoring data, calculate the minimum value of the minimum de-icing current of all monitoring points (MIN{I mini}), the minimum value of the de-icing current for (m - de-icing time elapsed) hours (MIN{I hi}), and the minimum value of the maximum non-full-ice-covering de-icing current (MIN{I FQmaxi}). Take the smaller value of MIN{I hi} and MIN{I FQmaxi} as the de-icing current, and this de-icing current should be greater than MIN{I mini}, otherwise it is prompted that de-icing cannot be performed under the current strategy, and it can automatically jump to the balanced strategy for judgment.

[0097] (2) Monitor the ground wire temperature Verify whether the ground wire temperature t of all monitoring points Di is less than the ground wire operating temperature t m . If so, the verification passes; if not, a prompt message "The ground wire temperature exceeds the allowable temperature. It is recommended to cancel the de-icing of this line or reduce the de-icing current" needs to be given. If the ground wire temperature exceeds the allowable temperature value, at this time, the adjustment method of the de-icing current is no longer executed according to the set strategy in the fastest de-icing mode or the ordinary de-icing mode, and the following method can be adopted: In the normal mode, if it is found that the temperature exceeds the limit, adjust the current de-icing current to I R ', and give priority to achieving it by extending the remaining de-icing time: ; Among them, T 允许 represents the allowable value of the ground wire temperature, and T 当前 represents the current value of the ground wire temperature.

[0098] In the fastest mode, based on the current de-icing current, it is adjusted by decreasing according to a set ratio.

[0099] (3)Monitor the ice coating thickness According to a fixed time step (such as 30 s, which can be set), calculate the de-icing current under the selected mode based on the real-time data of the line and adjust the de-icing current in real time, and monitor the ice coating thickness.

[0100] Set the target value D of the ice coating thickness MB , if D Hi are all less than D MB , the de-icing of this de-icing section is completed, and a prompt message "De-icing has been completed" is given.

[0101] According to the above rules, a software for real-time regulation and control of the ground wire de-icing current can be compiled in C# language. The software takes meteorological data such as the ambient temperature, ground wire temperature, wind speed, and ice coating thickness monitored by the transmission line and the ground wire parameters of the line as inputs, and is used to regulate the de-icing current mode in real time, and display the de-icing status of the line ground wire, meteorological conditions, and the ice coating situation of the line.

[0102] The main interface of the software for regulating and controlling the ground wire de-icing current is as Figure 3 shown.

[0103] The software can display external parameters such as the real-time ambient temperature, wind speed, and ice coating thickness of different monitoring points in real time, calculate the minimum de-icing current, maximum non-full ice coating de-icing current, maximum full ice coating de-icing current, timed de-icing current, etc. of each monitoring point, and automatically select the de-icing current of the line according to the de-icing mode and strategy built in the algorithm.

[0104] The software can set and modify the ground wire parameters of the line and the calculation parameters of the de-icing current. The software can set and modify the ground wire parameters of the line and the calculation parameters of the de-icing current, as Figure 4 shown. The software can set the de-icing mode and strategy, and specify the de-icing calculation interval time. If the current de-icing mode and strategy do not meet the requirements, the software can automatically jump to a more suitable de-icing mode and strategy and give a prompt, as Figure 5 shown.

[0105] Embodiment 2 The present invention provides an intelligent ground wire de-icing system for a transmission line. The transmission line includes multiple lines, including: An ice-covering safety index calculation module, which is used to calculate the real-time ice-covering safety degree of each line segment based on the predicted value of the real-time ice-covering thickness of each line segment, the tower bearing capacity, the conductor and ground wire tension, the crossing distance, and the loads of fittings and insulators; An ice melting sequence set generation module, which is used to sort all lines according to the real-time ice-covering safety degree of each line segment to form an ice melting sequence set; An ice melting operation module, which is used to select a preset number of lines with the highest ice melting urgency from the ice melting sequence set to perform ice melting operations; the ice melting process for any line includes: Selecting to execute the fastest ice melting mode or the normal ice melting mode; Both the fastest ice melting mode and the normal ice melting mode include an aggressive ice melting strategy, a balanced ice melting strategy, and a conservative ice melting strategy in which the ice melting current values are distributed in ascending order. According to the current ice melting current constraint conditions of the line, the corresponding ice melting strategy is selected or the ice melting mode is switched.

[0106] The content not detailed in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. An intelligent ice melting method for the ground wire of a transmission line, the transmission line comprising a plurality of lines, characterized in that: Including the following steps: Based on the real-time predicted ice thickness, tower bearing capacity, conductor and ground wire tension, crossing distance, and loads of fittings and insulators in each de-icing section, calculate the real-time ice-covering safety degree of each de-icing section; Sort all de-icing sections according to the real-time ice-covering safety degree of each de-icing section to form a de-icing sequence set, and select the de-icing section with the highest de-icing urgency in the de-icing sequence set to perform the de-icing operation: Select the fastest de-icing mode or the normal de-icing mode according to an external instruction. Both the fastest de-icing mode and the normal de-icing mode include an aggressive de-icing strategy, a balanced de-icing strategy, and a conservative de-icing strategy in which the de-icing current values are distributed in sequence from approximately small to large. Switch the corresponding de-icing mode or de-icing strategy according to the current de-icing constraint conditions of the de-icing section; adjust the de-icing current according to the monitoring data of the de-icing section.

2. The method according to claim 1, wherein: On several tower positions that are most prone to icing and least prone to icing on each de-icing section, monitoring points are arranged respectively for monitoring environmental temperature, ground wire temperature, wind speed, and ice thickness.

3. The method according to claim 1, wherein: The calculation process of the current ice-covering safety degree of any de-icing section includes: Use the analytic hierarchy process to calculate the risk weight coefficients of ice thickness, towers, conductors and ground wires, fittings, and insulators; Calculate the ratios of the current predicted ice thickness value to its limit value, the tower bearing capacity to its limit value, the conductor and ground wire tension and crossing distance to their limit values, the load of the fittings to its limit value, and the insulator load to its limit value for each monitoring point in this de-icing section respectively; According to the maximum value of each type of ratio and the corresponding weight, calculate the ice-covering safety index of this de-icing section.

4. The method according to claim 1, wherein: Only the de-icing sections whose current predicted ice thickness values reach the set threshold within the set time are added to the de-icing sequence set.

5. The method according to claim 2, wherein: The de-icing strategy switching process in the fastest de-icing mode includes: Give priority to executing the conservative de-icing strategy: Take the smaller value between the minimum value of the maximum full-ice de-icing current of all monitoring points and the minimum value of the maximum non-full-ice de-icing current as the de-icing current; this de-icing current should be greater than the minimum value of the minimum de-icing current of all monitoring points, otherwise jump to the balanced strategy; Balanced de-icing strategy: Take the smaller value between the average value of the maximum full-ice de-icing current of all monitoring points and the minimum value of the maximum non-full-ice de-icing current as the de-icing current; this de-icing current should be greater than the minimum value of the minimum de-icing current of all monitoring points, otherwise jump to the aggressive strategy; Aggressive strategy: Take the smaller value between the maximum value of the maximum full-ice de-icing current of all monitoring points and the minimum value of the maximum non-full-ice de-icing current as the de-icing current; this de-icing current should be greater than the minimum value of the minimum de-icing current of all monitoring points, otherwise prompt that the de-icing cannot be completed.

6. The method according to claim 4, characterized in that: The de-icing strategy switching process in the normal de-icing mode includes: Give priority to executing the conservative de-icing strategy: Take the smaller value between the minimum value of the remaining-time de-icing current of all monitoring points and the minimum value of the maximum non-full-ice de-icing current as the de-icing current; this de-icing current should be greater than the minimum value of the minimum de-icing current of all monitoring points, otherwise jump to the balanced strategy; Balanced ice melting strategy: Take the smaller value between the average of the remaining-time ice melting currents at all monitoring points and the minimum value among the maximum non-full-ice-coverage ice melting currents as the ice melting current; this ice melting current should be greater than the minimum value among the minimum ice melting currents at all monitoring points, otherwise jump to the aggressive strategy. Aggressive strategy: Take the smaller value between the maximum value of the remaining-time ice melting currents at all monitoring points and the minimum value among the maximum non-full-ice-coverage ice melting currents as the ice melting current; this ice melting current should be greater than the minimum value among the minimum ice melting currents at all monitoring points, otherwise jump to the fastest ice melting mode.

7. The method according to claim 4, wherein: The ice melting operation process for any ice melting section includes: All monitoring points in this ice melting section detect in real time whether the ground wire temperature is less than the set limit value; if so, this ice melting section continues to perform ice melting operation according to the ice melting current of the current strategy, otherwise reduce the ice melting current under the current strategy.

8. The method according to claim 1, wherein: The ice melting operation process for any ice melting section also includes: When the ice thickness at all monitoring points in this ice melting section reaches the set target value, end the ice melting operation for this ice melting section.

9. The method according to claim 5, wherein: The remaining time thawing current I at any monitoring point R is calculated by the following formula: ； Among them, D represents the outer diameter of the ground wire after ice coating, d represents the outer diameter of the ground wire, g0 represents the specific gravity of ice, b represents the ice coating thickness, △t represents the difference between the temperature of the ground wire and the ambient air temperature, T R represents the remaining time, R T0 represents the equivalent heat conduction resistance of the ice layer, R T1 represents the equivalent heat resistance of convection and radiation, and R0 represents the resistance of the ground wire at 0°C ambient air temperature.

10. An intelligent ice melting system for the ground wire of a transmission line, wherein the transmission line includes multiple lines, and is characterized in that: Including: An ice-covered safety index calculation module, used to calculate the real-time ice-covered safety degree of each ice melting section based on the real-time predicted ice thickness, tower bearing capacity, conductor and ground wire tension, crossing distance, and loads of fittings and insulators in each ice melting section. An ice melting sequence set generation module, used to sort all lines according to the real-time ice-covered safety degree of each ice melting section to form an ice melting sequence set, and select the ice melting section with the highest ice melting urgency to perform ice melting operation. An ice melting operation module, and the ice melting process for any ice melting section includes: Select to execute the fastest ice melting mode or the normal ice melting mode. Both the fastest ice melting mode and the normal ice melting mode include aggressive ice melting strategies, balanced ice melting strategies, and conservative ice melting strategies with ice melting current values distributed roughly from small to large. Select the corresponding ice melting strategy or perform ice melting mode switching according to the current ice melting current constraint conditions of the ice melting section.

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