Submarine cable state evaluation method and system

Abstract

The invention discloses a submarine cable state evaluation method and system, relates to the technical field of electric power, and aims to remove redundant data by adopting a multi-level screening mode so as to ensure that key data can be screened out preferentially and focus points can be adjusted in the current submarine cable state evaluation process, and the evaluation efficiency of the submarine cable state can be improved. The evaluation key point is ensured to always meet the current actual demand, so that the current evaluation precision is improved, the current evaluation reliability is enhanced, the scientificity and accuracy of the evaluation result are effectively ensured, and a powerful guarantee is provided for long-term safe operation of the submarine cable.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method and system for evaluating the status of a submarine cable. Background Art

[0002] Submarine cables are an indispensable part of modern communication and power transmission systems, and are widely used in transoceanic communications, offshore wind farm power supply and other fields. As the environment in which submarine cables are located is complex and changeable, and they are affected by various factors such as seawater corrosion, mechanical stress, and biological attachment for a long time, their status monitoring and evaluation are particularly important. Existing submarine cable status assessment methods usually include the following aspects: first, data is collected through a variety of sensors installed at key locations on the submarine cable, and then the collected data is analyzed to obtain a quantitative indicator of the submarine cable health index. Finally, a detailed assessment report is generated based on the indicator. Although the existing submarine cable status assessment method has made certain progress, there are still some significant defects in practical applications, which are mainly reflected in the following aspects: The data redundancy problem includes: 1. There are a large number of sensors installed on the existing submarine cables. Each sensor will generate a large amount of real-time data, which contains a large amount of redundant information, increasing the complexity of data processing; 2. Processing a large amount of data requires powerful computing resources, resulting in low computing efficiency, especially in large-scale and long-term data monitoring; 3. The existence of redundant data will affect the accuracy of the evaluation results and easily lead to misjudgment.

[0003] Therefore, the prior art urgently needs a technical solution for a submarine cable status assessment method and system. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for evaluating the status of a submarine cable, which is characterized by comprising the following steps: Step S1, obtaining at least two kinds of real-time operation data through sensors arranged on the submarine cable; The real-time operation data includes electrical performance data, mechanical performance data, environmental impact data, data communication performance data, physical location and burial depth data; Step S2, screening at least two kinds of real-time operation data, and analyzing the influence of each kind of real-time operation data retained after screening on the state of the submarine cable, to obtain a health index of the submarine cable state under each kind of real-time operation data retained; Step S2a, analyzing the importance of at least two real-time operation data, and scoring them according to the analysis results; Step S2b, setting a threshold for the score, when the score of the real-time operation data is greater than or equal to the threshold, it is retained; when the score of the real-time operation data is less than the threshold, it is removed; Step S2c, further analyzing each type of retained real-time operation data to obtain a health index of the submarine cable status under each type of retained real-time operation data; Step S2c1, obtaining sub-parameters in each type of retained real-time operation data, and performing importance analysis, sorting the sub-parameters according to the analysis results, and screening out the top N sub-parameters based on the sorting results; Step S2c2, based on each of the retained real-time operation data, obtain the data of the top N sub-parameters, and establish a data set, analyze the correlation between each of the top N sub-parameters according to the data set, and further screen out the sub-parameters with high positive correlation and high negative correlation according to the analysis results; Step S2c3, analyzing the correlation between each sub-parameter obtained through two screenings in step S2c1 and step S2c2 in each of the retained real-time operation data and the state of the submarine cable, obtaining a correlation coefficient between each sub-parameter obtained through two screenings in each of the retained real-time operation data and the state of the submarine cable, assigning a first weight to each sub-parameter obtained through two screenings according to the correlation coefficient, and assigning a second weight to each sub-parameter obtained through two screenings based on the importance analysis result in step S2c1; Step S2c4, combining the first weight and the second weight to obtain a comprehensive weight of each sub-parameter obtained by twice screening in each type of retained real-time operation data; Step S2c5, according to the correlation coefficient between each sub-parameter obtained by two screenings in each retained real-time operation data and the submarine cable status, the comprehensive weight of each sub-parameter obtained by two screenings in each retained real-time operation data, and the score of each retained real-time operation data, obtain the health index of the submarine cable status under each retained real-time operation data; Among them, the calculation formula for the health index of the submarine cable status under each retained real-time operation data is: ; in, Represents the health index of the submarine cable status under the i-th type of real-time operation data retained; Represents the number of types of real-time operation data retained; represents the score of the i-th type of real-time running data retained; Represents the number of sub-parameters obtained by two screenings in the i-th real-time running data retained; represents the correlation coefficient of the jth sub-parameter obtained by two screenings in the i-th real-time operation data retained; Represents the comprehensive weight of the jth sub-parameter obtained by twice screening in the i-th real-time operation data retained; Step S3, comprehensively analyzing the health index of the submarine cable status under each of the real-time operation data retained, and obtaining a comprehensive health value of the submarine cable status; Among them, the calculation formula for the comprehensive health value of the submarine cable status is: ; in, A comprehensive health value representing the status of the submarine cable; Represents the number of types of real-time operation data retained; represents the score of the i-th type of real-time running data retained; Represents the health index of the submarine cable status under the i-th type of real-time operation data retained.

[0005] Step S4: Generate a comprehensive report on the status of the submarine cable according to the comprehensive health value of the submarine cable status.

[0006] A submarine cable status assessment system, using a submarine cable status assessment method as described in any one of the above items, comprises the following modules: Data acquisition module: used to obtain at least two kinds of real-time operation data through sensors arranged on the submarine cable; Data screening and analysis module: connected to the data acquisition module, used to screen at least two real-time operation data, and analyze the influence of each retained real-time operation data on the submarine cable status, and obtain the health index of the submarine cable status under each retained real-time operation data; Comprehensive health value calculation module: connected to the data screening and analysis module, used to comprehensively calculate the health index of the submarine cable status under the retained real-time operation data to obtain the comprehensive health value of the submarine cable status; Comprehensive report generation module: connected to the comprehensive health value calculation module, used to generate a comprehensive report on the submarine cable status according to the comprehensive health value of the submarine cable status.

[0007] The embodiments of the present invention have the following technical effects: The present invention removes redundant data by adopting a multi-level screening method to ensure that in the process of current submarine cable status assessment, key data can be preferentially screened out, the focus is adjusted, and the focus of the assessment is always in line with the current actual needs, so as to improve the accuracy of the current assessment and enhance the reliability of the current assessment; firstly, the real-time operation data that is not important or has low importance for the current submarine cable status assessment is eliminated by means of importance scoring and setting a threshold, and then the importance degree analysis is also performed on the retained real-time operation data, and the importance degree is sorted, and the sub-parameters with high importance are preferentially screened out in a top N manner, and then the selected sub-parameters are further screened by a correlation analysis method, and mainly the sub-parameters with high positive correlation and high negative correlation are further selected, so that the redundant data can be further effectively removed and the effect of reducing the data processing pressure can be achieved, which can not only further reduce the calculation amount of data processing and improve the calculation efficiency, but also does not affect the accuracy of the final evaluation result, on the contrary, it can be more targeted and effectively evaluate the current submarine cable status, which is particularly important for large-scale and long-term data monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 is a flow chart of a method for evaluating submarine cable status provided by an embodiment of the present invention; Figure 2 It is a framework diagram of a submarine cable status assessment system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0011] Embodiment 1: Figure 1 As shown, the present invention provides a method for evaluating the status of a submarine cable, comprising the following steps: Step S1, obtaining at least two kinds of real-time operation data through sensors arranged on the submarine cable; The real-time operation data includes electrical performance data, mechanical performance data, environmental impact data, data communication performance data, physical location and burial depth data; It is worth noting that the five types of real-time operation data mentioned above cover most of the real-time operation data types, and therefore can provide sufficient information to assess the status of submarine cables. However, specific circumstances still need to be considered, that is, additional specific real-time operation data types still need to be added based on specific circumstances. Exemplarily, electrical performance data include but are not limited to data such as voltage, current, insulation resistance, leakage current, power factor, etc.; mechanical performance data include but are not limited to data such as stress, strain, vibration, displacement, pressure, acceleration, etc.; environmental impact data include but are not limited to data such as temperature, humidity, salinity, pH value, dissolved oxygen content, biological attachment, corrosion, etc.; data communication performance data include but are not limited to data such as bit error rate, signal strength, delay, bandwidth utilization, data transmission rate, etc.; physical location and burial data include but are not limited to location coordinates, burial depth, inclination angle, motion state data, etc. of the cable; The acquisition of electrical performance data includes but is not limited to the use of voltage sensors, current sensors, insulation resistance testers, leakage current sensors, etc. Among them, voltage sensors and current sensors should be installed at the joints or terminals of the cables to ensure that the working voltage and current of the cables can be accurately monitored. Insulation resistance testers should be used regularly, usually during maintenance. Leakage current sensors should be installed at the joints or terminals of the cables to monitor whether the cables have abnormal leakage currents. The acquisition of mechanical performance data includes but is not limited to the use of stress / strain sensors, vibration sensors, displacement sensors, pressure sensors, etc.; among them, stress / strain sensors should be embedded inside the cable or installed at key locations of the cable, such as joints and bends; vibration sensors should be installed on the supporting structure of the cable to monitor whether the cable is affected by external vibration; pressure sensors should be installed inside or outside the protective layer of the cable to monitor the surrounding pressure changes; displacement sensors should be installed at the fixed points of the cable to monitor the position changes and deformation of the cable; The acquisition of environmental impact data includes, but is not limited to, the use of salinity sensors, pH sensors, dissolved oxygen sensors, biological attachment sensors, temperature sensors, etc.; among which, salinity sensors, pH sensors and dissolved oxygen sensors should be installed on the seabed bracket near the cable to regularly monitor the chemical composition of seawater, biological attachment sensors should be installed on or near the cable surface to monitor biological attachment on the cable surface, and temperature sensors should be installed on the seabed bracket near the cable to monitor temperature changes in seawater; The acquisition of data communication performance data includes, but is not limited to, the use of bit error rate testers, signal strength testers, delay testers, bandwidth utilization testers, etc.; among which, the bit error rate testers, signal strength testers, delay testers, and bandwidth utilization testers should be installed in the terminal equipment of the cable, such as land stations or submarine nodes, and real-time monitoring should be carried out through dedicated software; The acquisition of physical location and burial data includes but is not limited to the use of GPS positioning systems, sonar rangefinders, inclination sensors, accelerometers, etc.; among them, the GPS positioning system should be installed on the cable terminal equipment or maintenance vessel to monitor the position of the cable in real time through the satellite positioning system; the sonar rangefinder should be installed on the cable laying vessel or maintenance vessel to regularly measure the buried depth of the cable; the inclination sensor should be installed at the key position of the cable to monitor the inclination angle of the cable; the accelerometer should be installed at the fixed point of the cable to monitor the movement state and stability of the cable.

[0012] Step S2, screening at least two kinds of real-time operation data, and analyzing the influence of each kind of real-time operation data retained after screening on the state of the submarine cable, to obtain a health index of the submarine cable state under each kind of real-time operation data retained; It is worth noting that each time the above five types of real-time operating data are used to evaluate the status of the submarine cable, the real-time operating data that are screened and eliminated are different. This is because: First, the environmental conditions and working conditions of the submarine cable are constantly changing. For example, the temperature, salinity, and biological attachment in the marine environment will change with the seasons and geographical locations. Therefore, these data need to be re-analyzed each time the evaluation is performed to ensure the timeliness and accuracy of the evaluation results; Second, by screening and eliminating unimportant data, resources and energy can be concentrated on the most critical data to improve evaluation efficiency, which can reduce unnecessary computing and storage burdens while ensuring the validity of the evaluation results; Third, different failure modes will appear at different time points. For example, in a certain period of time, electrical performance data issues will be the main focus, while in another period of time, mechanical performance data or environmental impact data are more critical. Through regular screening, the focus can be adjusted in time to ensure that the focus of the evaluation always meets the current actual needs.

[0013] Step S2a, analyzing the importance of at least two real-time operation data, and scoring them according to the analysis results; For example, in actual operation, it is necessary to perform importance analysis on the above five types of real-time operation data, and score each type of real-time operation data according to the analysis results. The following is a detailed embodiment: 1. Electrical performance data: Importance analysis: Electrical performance data is directly related to the transmission capacity and signal quality of the cable, and is the basis for the normal operation of the cable. Therefore, the score is: 0.87; 2. Mechanical performance data: Importance analysis: Mechanical performance data reflects the physical integrity and durability of the cable, which is crucial for long-term reliability, so the score is: 0.83; 3. Environmental impact data: Importance analysis, environmental factors such as seawater salinity, temperature, biological activity, etc. have a great impact on the long-term stable operation of cables, so the score is: 0.8; 4. Data communication performance data: importance analysis, communication performance data includes bit error rate, signal delay, etc., which directly affects the quality of data transmission, so the score is: 0.8; 5. Physical location and burial data: Importance analysis, physical location and burial data are very important to prevent external interference and protect cables from damage, so the score is: 0.7.

[0014] Step S2b, setting a threshold for the score, when the score of the real-time operation data is greater than or equal to the threshold, it is retained; when the score of the real-time operation data is less than the threshold, it is removed; Exemplarily, a threshold is set for the above score, and the threshold is set in the form of the average of all scores. Taking the above score as an example, the threshold is 0.8, so the real-time operation data eliminated are the physical location and deep burial data.

[0015] Step S2c, further analyzing each type of retained real-time operation data to obtain a health index of the submarine cable status under each type of retained real-time operation data; In step S2b, the following four types of real-time operation data have been determined to be retained: electrical performance data, mechanical performance data, environmental impact data, and data communication performance data; next, the importance of the sub-parameters included in these real-time operation data is analyzed, and the sub-parameters are sorted according to the analysis results, and finally the top N most important sub-parameters are screened out; Step S2c1, obtaining sub-parameters in each type of retained real-time operation data, and performing importance analysis, sorting the sub-parameters according to the analysis results, and screening out the top N sub-parameters based on the sorting results; Exemplarily, in the electrical performance data, sub-parameters included include, but are not limited to: voltage, current, insulation resistance, leakage current; Perform importance analysis on these sub-parameters: Voltage: directly affects the normal working state of the cable, very important; Current: reflects the working load of the cable, very important; Insulation resistance: affects the safety and reliability of the cable, very important; Leakage current: indicates whether there is a potential insulation problem in the cable, which is more important; Therefore, the corresponding scores are: voltage: 0.9, current: 0.85, insulation resistance: 0.8, leakage current: 0.75; Then, the above sub-parameters are sorted as follows: voltage > current > insulation resistance > leakage current; assuming N = 3, the top 3 sub-parameters are selected, namely: voltage, current, insulation resistance; The remaining real-time running data can be analyzed and operated as above, and will not be described in detail here.

[0016] Step S2c2, based on each of the retained real-time operation data, obtain the data of the top N sub-parameters, and establish a data set, analyze the correlation between each of the top N sub-parameters according to the data set, and further screen out the sub-parameters with high positive correlation and high negative correlation according to the analysis results; In this embodiment, only the top 3 sub-parameters in the electrical performance data are taken as an example to further screen the sub-parameters. First, the data of voltage, current, and insulation resistance within a period of time are obtained respectively, and a data set is established. The data set of voltage is , the current data set is ,Next, the sliding window method is used and the window size is set to 5 to divide each data set into multiple windows; Therefore, the window one of the voltage data set is, , the window 2 of the voltage data set is , and the rest of the windows are set in the same way, as well as the windows of the current data set; then the correlation calculation formula is used to analyze the correlation between each sub-parameter in each window one by one, and finally based on the analysis and calculation results, a high positive correlation threshold and a high negative correlation threshold need to be set in this process. Finally, under the premise of comprehensively analyzing the calculation results of each window and after comparing the high positive correlation threshold and the high negative correlation threshold, it can be obtained that each sub-parameter has a high positive correlation or a high negative correlation with each other, so as to further screen out sub-parameters with high positive correlation and high negative correlation.

[0017] Step S2c3, analyzing the correlation between each sub-parameter obtained through two screenings in step S2c1 and step S2c2 in each of the retained real-time operation data and the state of the submarine cable, obtaining a correlation coefficient between each sub-parameter obtained through two screenings in each of the retained real-time operation data and the state of the submarine cable, assigning a first weight to each sub-parameter obtained through two screenings according to the correlation coefficient, and assigning a second weight to each sub-parameter obtained through two screenings based on the importance analysis result in step S2c1; In this embodiment, the sub-parameters obtained by further screening in step S2c2 of the electrical performance data are still taken as an example, and a data set of the sub-parameters is obtained, including a data set of voltage and five windows of the voltage data set, and then a data set of the submarine cable status is obtained. The acquisition process includes obtaining the performance of the submarine cable status over a period of time, including excellent, good, general, poor, and bad, and a total of ten groups of performance results are obtained, and there must be repeated performance results in the performance results, and the above performance results are quantified accordingly, and the submarine cable status data set that can be obtained is, , and after dividing the data set of submarine cable status into windows, the window one is obtained as, , window two is, , the data sets of other windows can be set as above; Next, using the same data set as window one, that is, , , the correlation coefficient between the voltage and the submarine cable state in the window 1 data set is calculated , and then calculate the correlation coefficient between voltage and submarine cable status in windows 2, 3, 4, and 5. The correlation coefficient in window 2 is , the window three-time correlation coefficient is , the window four-time correlation coefficient is , the correlation coefficient for window 5 is Then, we combine the above five correlation coefficients and take the average, and finally we can get the correlation coefficient between voltage and submarine cable status. Finally, according to the calculated correlation coefficient, the first weight is assigned to the voltage sub-parameter. The same is true for the subsequent assignment of the first weight of the current sub-parameter. The first weight of each sub-parameter obtained after two screenings, including the subsequent mechanical performance data, environmental impact data, and data communication performance data, can also be obtained by the above analysis and calculation, so they will not be elaborated here.

[0018] Step S2c4, combining the first weight and the second weight to obtain a comprehensive weight of each sub-parameter obtained by twice screening in each type of retained real-time operation data; Step S2c5, according to the correlation coefficient between each sub-parameter obtained by two screenings in each retained real-time operation data and the submarine cable status, the comprehensive weight of each sub-parameter obtained by two screenings in each retained real-time operation data, and the score of each retained real-time operation data, obtain the health index of the submarine cable status under each retained real-time operation data; Among them, the calculation formula for the health index of the submarine cable status under each retained real-time operation data is: ; in, Represents the health index of the submarine cable status under the i-th type of real-time operation data retained; Represents the number of types of real-time operation data retained; represents the score of the i-th type of real-time running data retained; Represents the number of sub-parameters obtained by two screenings in the i-th real-time running data retained; represents the correlation coefficient of the jth sub-parameter obtained by two screenings in the i-th real-time operation data retained; Represents the comprehensive weight of the jth sub-parameter obtained by twice screening in the retained i-th real-time operation data.

[0019] Step S3, comprehensively analyzing the health index of the submarine cable status under each of the real-time operation data retained, and obtaining a comprehensive health value of the submarine cable status; Among them, the calculation formula for the comprehensive health value of the submarine cable status is: ; in, A comprehensive health value representing the status of the submarine cable; Represents the number of types of real-time operation data retained; represents the score of the i-th type of real-time running data retained; Represents the health index of the submarine cable status under the i-th type of real-time operation data retained.

[0020] Step S4: Generate a comprehensive report on the status of the submarine cable according to the comprehensive health value of the submarine cable status.

[0021] Embodiment 2: Figure 2 As shown, the present invention also proposes a submarine cable status assessment system, which executes a submarine cable status assessment method as described above, and includes the following modules: Data acquisition module: used to obtain at least two kinds of real-time operation data through sensors arranged on the submarine cable; Data screening and analysis module: connected to the data acquisition module, used to screen at least two real-time operation data, and analyze the influence of each retained real-time operation data on the submarine cable status, and obtain the health index of the submarine cable status under each retained real-time operation data; Comprehensive health value calculation module: connected to the data screening and analysis module, used to comprehensively calculate the health index of the submarine cable status under the retained real-time operation data to obtain the comprehensive health value of the submarine cable status; Comprehensive report generation module: connected to the comprehensive health value calculation module, used to generate a comprehensive report on the submarine cable status according to the comprehensive health value of the submarine cable status.

[0022] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present application. As shown in the present specification, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0023] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A method for assessing submarine cable status, characterized in that: The following steps are involved: Step S1, obtaining at least two kinds of real-time operation data through sensors arranged on the submarine cable; Step S2, screening at least two kinds of real-time operation data, and analyzing the influence of each kind of real-time operation data retained after screening on the state of the submarine cable, to obtain a health index of the state of the submarine cable under each kind of real-time operation data retained; Step S3, comprehensively analyzing the health index of the submarine cable status under each of the real-time operation data retained, and obtaining a comprehensive health value of the submarine cable status; Step S4: Generate a comprehensive report on the status of the submarine cable according to the comprehensive health value of the submarine cable status.

2. A method for evaluating submarine cable status according to claim 1, characterized in that: The real-time operation data includes electrical performance data, mechanical performance data, environmental impact data, data communication performance data, physical location and burial depth data.

3. A method for evaluating submarine cable status according to claim 1, characterized in that: The screening of at least two real-time operation data and analyzing the influence of each retained real-time operation data on the state of the submarine cable to obtain a health index of the submarine cable state under each retained real-time operation data includes: Step S2a, analyzing the importance of at least two real-time operation data, and scoring them according to the analysis results; Step S2b, setting a threshold for the score, when the score of the real-time operation data is greater than or equal to the threshold, it is retained; when the score of the real-time operation data is less than the threshold, it is removed; Step S2c: further analyze each type of retained real-time operation data to obtain a health index of the submarine cable status under each type of retained real-time operation data.

4. A method for evaluating submarine cable status according to claim 3, characterized in that: The further analysis of each retained real-time operation data to obtain a health index of the submarine cable status under each retained real-time operation data includes: Step S2c1, obtaining sub-parameters in each type of retained real-time operation data, and performing importance analysis, sorting the sub-parameters according to the analysis results, and screening out the top N sub-parameters based on the sorting results; Step S2c2, based on each of the retained real-time operation data, obtain the data of the top N sub-parameters, and establish a data set, analyze the correlation between each of the top N sub-parameters according to the data set, and further screen out the sub-parameters with high positive correlation and high negative correlation according to the analysis results; Step S2c3, analyzing the correlation between each sub-parameter obtained through two screenings in step S2c1 and step S2c2 in each of the retained real-time operation data and the state of the submarine cable, obtaining a correlation coefficient between each sub-parameter obtained through two screenings in each of the retained real-time operation data and the state of the submarine cable, assigning a first weight to each sub-parameter obtained through two screenings according to the correlation coefficient, and assigning a second weight to each sub-parameter obtained through two screenings based on the importance analysis result in step S2c1; Step S2c4, combining the first weight and the second weight to obtain a comprehensive weight of each sub-parameter obtained by twice screening in each type of retained real-time operation data; Step S2c5, according to the correlation coefficient between each sub-parameter obtained by two screenings in each retained real-time operation data and the submarine cable status, the comprehensive weight of each sub-parameter obtained by two screenings in each retained real-time operation data, and the score of each retained real-time operation data, the health index of the submarine cable status under each retained real-time operation data is obtained.

5. A method for evaluating submarine cable status according to claim 4, characterized in that: The calculation formula of the health index of the submarine cable status under each retained real-time operation data is: ; in, Represents the health index of the submarine cable status under the i-th type of real-time operation data retained; Represents the number of types of real-time operation data retained; represents the score of the i-th type of real-time running data retained; Represents the number of sub-parameters obtained by two screenings in the i-th real-time running data retained; represents the correlation coefficient of the jth sub-parameter obtained by two screenings in the i-th real-time operation data retained; Represents the comprehensive weight of the jth sub-parameter obtained by twice screening in the retained i-th real-time operation data.

6. A method for evaluating submarine cable status according to claim 1, characterized in that: The calculation formula for obtaining the comprehensive health value of the submarine cable status is: ； in, A comprehensive health value representing the status of the submarine cable; Represents the number of types of real-time operation data retained; represents the score of the i-th type of real-time running data retained; Represents the health index of the submarine cable status under the i-th type of real-time operation data retained.

7. A submarine cable status assessment system, used to execute a submarine cable status assessment method according to any one of claims 1 to 6, characterized in that: The system comprises: Data acquisition module: used to obtain at least two kinds of real-time operation data through sensors arranged on the submarine cable; Data screening and analysis module: connected to the data acquisition module, used to screen at least two real-time operation data, and analyze the influence of each retained real-time operation data on the submarine cable status, and obtain the health index of the submarine cable status under each retained real-time operation data; Comprehensive health value calculation module: connected to the data screening and analysis module, used to comprehensively calculate the health index of the submarine cable status under the retained real-time operation data to obtain the comprehensive health value of the submarine cable status; Comprehensive report generation module: connected to the comprehensive health value calculation module, used to generate a comprehensive report on the submarine cable status according to the comprehensive health value of the submarine cable status.

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