Method and system for correcting the current-carrying capacity calculation of a submarine cable under marine biofouling

Abstract

The application discloses a kind of marine biological attachment undersea cable's current-carrying capacity calculation correction method and system, utilize finite element simulation software to establish undersea cable three-dimensional model, in three-dimensional frequency domain solving Maxwell-Ampere equation, obtain three-phase conductor loss;According to three-phase conductor loss calculation without attachment condition under the current-carrying capacity size and with IEC series standard formula calculated current-carrying capacity result comparison verification model accuracy;Change the thickness of attachment material simulates the influence of different marine biological attachment thickness on the size of current-carrying capacity, under marine biological attachment thickness to undersea cable three-dimensional model is simulated calculation, the current-carrying capacity size calculated;Analysis the current-carrying capacity size under different marine biological attachment thickness, calculate correction coefficient;From IEC 60287 series standard calculated current-carrying capacity calculation formula is corrected.The application can make the current-carrying capacity size of undersea cable J-shaped pipe section more accurate.

Description

Technical Field

[0001] This invention relates to a method and system for calculating and correcting the current carrying capacity of a three-core submarine cable with marine organism attachment, belonging to the field of cable technology. Background Technology

[0002] With rapid economic development and deepening urbanization, the demand for electricity is increasing daily, making cross-sea power transmission increasingly urgent. Three-core submarine cable transmission projects are a crucial component of cross-sea power grid interconnection projects, playing a significant role in realizing the internationalization of power grids and the interconnection of regional power grids. Offshore power transmission primarily relies on three-core submarine cables. The distribution structure for offshore wind power starts from the substation platform, passes through J-shaped pipe sections, submarine sections, tidal flat sections, landing sections, and finally enters the onshore terminal station. The J-shaped pipe, positioned between the platform and the seabed, serves as the channel for the three-core submarine cable. In shallow waters, it is subject to significant tidal differences and wave impacts, leading to marine organism attachment in the splash zone and low tide line area. Due to tidal influences, it is exposed to air for extended periods, affecting cable heat dissipation and causing overheating. Submarine cables typically have a lifespan of 30 years, after which marine organisms accumulate to a considerable thickness on the J-shaped pipe. Submarine cables are expensive, difficult to maintain in the marine environment, and have long maintenance cycles. A failure could paralyze the offshore wind power transmission line, causing severe economic losses. Therefore, studying the impact of marine organism attachment on the current carrying capacity of the J-shaped section is of great significance for the power transmission of the entire cable. It can reduce the probability of power transmission failure, improve the stability of power transmission, and facilitate the selection of a reasonable cable cross-section from a safety perspective during the engineering design stage. Summary of the Invention

[0003] The purpose of this invention is to propose a method and system for calculating and correcting the current carrying capacity of a three-core submarine cable with marine organism attachment. The current carrying capacity calculation formula of the IEC 60287 series standards is revised to make the current carrying capacity of the J-shaped pipe section more accurate.

[0004] The technical solution of this invention is a method for calculating and correcting the current carrying capacity of submarine cables with marine organism attachment, the steps of which are as follows:

[0005] Step S1: Obtain environmental information on the site topography of the submarine cable and structural data of the submarine cable; establish a three-dimensional model of the submarine cable using finite element simulation software;

[0006] Step S2: Add the corresponding materials and parameters to the 3D model of the submarine cable, add a magnetic field and current, add three coils in the magnetic field, apply an excitation current to each coil and add Ampere's law to the metal shield and armor; add current conservation to the metal shield and armor in the current, and ground the bottom metal shield and armor.

[0007] Step S3: Simulate the three-dimensional model of the submarine cable using finite element software, solve the Maxwell-Ampere equation in the three-dimensional frequency domain, and obtain the three-phase conductor loss.

[0008] Step S4: Calculate the current carrying capacity under no-attachment conditions based on the three-phase conductor loss, and compare it with the current carrying capacity under no-attachment conditions calculated based on the IEC 60287 series standards to verify the correctness of the submarine cable three-dimensional model. Adjust the parameter conditions of the submarine cable three-dimensional model until the current carrying capacity obtained by simulation calculation is within the error range of the calculation result based on the IEC 60287 series standards.

[0009] Step S5: Based on verifying the correctness of the three-dimensional model of the submarine cable, the thickness of the attachment material is changed to simulate the effect of different marine organism attachment thicknesses on the current carrying capacity. The three-dimensional model of the submarine cable is simulated and calculated under the marine organism attachment thickness to obtain the corresponding three-phase conductor loss. The current carrying capacity is calculated based on the three-phase conductor loss.

[0010] Step S6: Analyze the flow rate under different marine organism attachment thicknesses, calculate the average flow rate under different marine organism attachment thicknesses, and compare it with the flow rate calculated without marine organism attachment to calculate the correction coefficient.

[0011] Step S7: Correct the current carrying capacity calculation formula based on the IEC 60287 series standards using the correction factor, and then calculate the current carrying capacity of the submarine cable with attached marine organisms.

[0012] Further preferably, the correction coefficient is:

[0013]

[0014] In the formula, α is the correction coefficient for the impact of marine organism attachment on the carrying capacity; I i Ii represents the current carrying capacity of a single conductor simulated under the thickness of the i-th type of marine organism attachment; I0 represents the current carrying capacity of a single conductor simulated under the condition of no attachment.

[0015] The formula for calculating the current-carrying capacity of submarine cables with attached marine organisms using a correction factor is as follows:

[0016]

[0017] In the formula, I′ is the corrected current carrying capacity; Δθ is the conductor temperature rise above ambient temperature; R is the AC resistance per unit length of the conductor at the highest operating temperature; W dT1 is the dielectric loss per unit length of conductor insulation; T2 is the thermal resistance per unit length between a conductor and a metal tube; T3 is the thermal resistance per unit length of the inner lining between the metal shield and the armor; T4 is the thermal resistance per unit length of the cable outer sheath; T5 is the thermal resistance per unit length of the cable outer sheath. * To account for the correction value of the external thermal resistance of the cable in the air under sunlight; n is the number of conductors in the cable carrying the load; λ1 is the ratio of cable sheath loss to the total loss of all conductors; λ2 is the ratio of cable armor loss to the total loss of all conductors. σ is the outer diameter of the cable; H is the absorption coefficient when sunlight shines on the cable surface; σ is the solar radiation intensity.

[0018] Further optimization involves using the calcium material built into the finite element software in step S5 to set corresponding thickness parameters and simulate marine organism attachment.

[0019] Further optimization involves considering environmental information about the submarine cable site topography, including direct sunlight temperature, wind speed, and local meteorological data.

[0020] Further optimization involves selecting structural data for submarine cables, including conductor diameter, insulation thickness, armor thickness, inner shield, outer shield, metallic shield, PE sheath, inner liner, and outer sheath diameter.

[0021] This invention also provides a current-carrying capacity calculation and correction system for submarine cables under marine organism attachment, comprising a submarine cable three-dimensional model module, a three-phase conductor loss calculation module, a marine organism attachment simulation module, and a current-carrying capacity correction module. The submarine cable three-dimensional model module establishes a three-dimensional model of the submarine cable based on acquired environmental information and structural parameters; the three-phase conductor loss calculation module calculates the three-phase conductor loss based on the submarine cable three-dimensional model; the marine organism attachment simulation module simulates the thickness of marine organism attachment; and the current-carrying capacity correction module calculates the current-carrying capacity according to the IEC standard current-carrying capacity calculation formula and corrects the current-carrying capacity using a correction factor.

[0022] This invention provides a non-volatile computer storage medium storing computer-executable instructions that can execute a current-carrying capacity calculation and correction method for submarine cables with marine organism attachment in any of the above embodiments.

[0023] This invention provides a computer program virtual device, which includes a computer program stored on a non-volatile computer storage medium. The computer program includes program instructions, which, when executed by a computer, cause the computer to perform a current-carrying capacity calculation and correction method for submarine cables with marine organism attachment as described in the above embodiment.

[0024] The present invention provides an electronic device, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform a method for calculating and correcting the current carrying capacity of a submarine cable with marine organism attachment.

[0025] This invention considers the impact of marine organisms attaching to J-shaped pipe sections on current carrying capacity. Marine organisms attach to the J-shaped pipe at high and low tide levels and in the splash zone, and prolonged exposure to air affects heat dissipation of the submarine cable. A three-dimensional cable model is established using finite element method (FEM) software, and the corresponding current carrying capacity is calculated and verified against the current carrying capacity calculated according to the IEC 60287 standard. Based on the cable current carrying capacity calculation formula described in the IEC standard, this invention uses FEM software to establish a three-dimensional model of the submarine power cable, simulates and calculates the current carrying capacity of a three-core submarine cable inside a J-shaped pipe with different thicknesses of marine organism attachment, and compares it with the current carrying capacity of a three-core submarine cable inside a J-shaped pipe without considering marine organism attachment. The analysis examines the impact of different amounts of marine organism attachment on the current carrying capacity of the J-shaped pipe section, thereby revising the current carrying capacity calculation formula.

[0026] This invention simplifies the three-dimensional model of a three-core submarine cable into a conductor, conductor shield, armor shield, insulation layer, and outer sheath. All structural data of the three-core submarine cable are acquired, and the corresponding geometric figures are drawn and combined in finite element software. Based on the conductivity, relative permeability, and relative permittivity of the corresponding materials, the corresponding materials and parameters are added in the finite element software. Magnetic fields and currents are added; three coils are added to the magnetic field, and an excitation current is applied to each coil, while Ampere's law is applied to the conductor shield and armor shield. Current conservation is applied to the conductor shield and armor shield in the current calculation, and the bottom conductor shield and armor shield are grounded. To mesh the three-dimensional model of the three-core submarine cable, the conductor, conductor shield, and armor shield are further subdivided, improving runtime and the accuracy of calculation results. Attached Figure Description

[0027] Figure 1 This is a flowchart of the method of the present invention.

[0028] Figure 2 This is a three-dimensional model of a three-core submarine cable.

[0029] Figure 3 Mesh partitioning diagram for modeling.

[0030] Figure 4 This is a simulation result diagram of a three-dimensional three-core submarine cable.

[0031] Figure 5This is a comparison chart showing the relationship between different thicknesses of the deposit and the current carrying capacity. Detailed Implementation

[0032] The present invention will be further explained in detail below with reference to the embodiments.

[0033] Reference Figures 1-5 A method for correcting the current-carrying capacity calculation of submarine cables with marine organism attachment, the steps of which are as follows:

[0034] Step S1: Obtain environmental information such as solar direct temperature, wind speed, and local meteorological data of the submarine cable site topography; obtain structural data such as conductor diameter, insulation thickness, armor thickness, inner shield, outer shield, metal shield, PE sheath, inner lining layer, and outer sheath diameter of the submarine cable; and establish a three-dimensional model of the submarine cable using finite element simulation software.

[0035] HYJQF41-26 / 35kV-3×300mm 2 Taking a three-core submarine cable as an example, data such as conductivity, relative permeability, and relative permittivity of all structures and corresponding materials of the three-core submarine cable are obtained, as shown in Table 1. Based on the conductor diameter, metal shielding thickness, armor thickness, and outer sheath diameter given in Table 1, a three-dimensional model of the three-core submarine cable is finally established. Figure 2 As shown.

[0036] HYJQF41-26 / 35 3×300 Submarine Cable

[0037]

[0038] Table 1 HYJQF41-26 / 35kV-3×300mm 2 Submarine cable structure data diagram

[0039] Step S2: Add the corresponding materials and parameters to the 3D model of the submarine cable, add a magnetic field and current, add three coils in the magnetic field, apply an excitation current to each coil and add Ampere's law to the metal shield and armor; add current conservation to the metal shield and armor in the current, and ground the bottom metal shield and armor.

[0040] Step S3: When the three-phase core conductors of the submarine cable are energized, conductor losses will inevitably occur, and a magnetic field will be generated in the surrounding area. The metal shielding and armor structures in the magnetic field will generate induced electromotive force, thereby generating induced current and losses. Therefore, the three-dimensional model of the submarine cable is simulated using finite element software, and the Maxwell-Ampère equation is solved in the three-dimensional frequency domain to obtain the three-phase conductor losses.

[0041] Step S4: Calculate the current carrying capacity under no-attachment conditions based on the three-phase conductor loss, and compare it with the current carrying capacity under no-attachment conditions calculated based on the IEC 60287 series standards to verify the correctness of the submarine cable three-dimensional model. Calculate the error of the obtained results and control it within 5%. Adjust the parameter conditions of the submarine cable three-dimensional model until the current carrying capacity calculated by simulation is within the error range of the calculation results based on the IEC 60287 series standards.

[0042] The method for calculating the current carrying capacity under no-attachment conditions based on the three-phase conductor losses is as follows:

[0043]

[0044] In the formula, I0 is the current carrying capacity of a single conductor obtained by simulation under no-attachment conditions, W0 is the three-phase conductor loss obtained by simulation under no-attachment conditions, and R is the AC resistance per unit length of the conductor at the highest operating temperature, Ω / m.

[0045] The current carrying capacity calculated based on the IEC 60287 series standards in this embodiment is 444.4A. The current carrying capacity of a single conductor obtained by simulation under no-attachment conditions is 430.6A. This indicates that the error in the current carrying capacity obtained by three-phase modeling is about 3%, which shows that the three-dimensional model of the submarine cable meets the requirements and can be used to simulate and calculate the current carrying capacity.

[0046] Based on the current carrying capacity calculation formula in the IEC 60287 series standards:

[0047]

[0048] In the formula, I z The current carrying capacity of a single conductor, calculated based on the IEC 60287 series standards, is expressed in A; Δθ is the conductor temperature rise above ambient temperature, expressed in K; R is the AC resistance per unit length of the conductor at the highest operating temperature, expressed in Ω / m; W. d T1 is the dielectric loss per unit length of conductor insulation, W / m; T2 is the thermal resistance per unit length between a conductor and a metal tube, (K·m) / W; T3 is the thermal resistance per unit length of the inner lining between the metal shield and the armor, (K·m) / W; T4 is the thermal resistance per unit length of the cable outer sheath, (K·m) / W; * To account for the correction value of the external thermal resistance of the cable in air under sunlight, (K·m) / W; n is the number of conductors carrying the load in the cable; λ1 is the ratio of cable sheath loss to total loss of all conductors; λ2 is the ratio of cable armor loss to total loss of all conductors. σ is the outer diameter of the cable (m); σ is the absorption coefficient when sunlight shines on the cable surface; H is the solar radiation intensity.

[0049] Based on the thermal resistance calculation formula in the IEC 60287 series standards:

[0050]

[0051] In the formula, T4 * To account for the correction value of the external thermal resistance of the cable in air under sunlight, (K·m) / W; h is the heat dissipation coefficient, W / (m 2 ·k 5 / 4 ); Where θ is the outer diameter of the cable, in meters; Δθ s The temperature rise of the cable surface relative to the ambient temperature is expressed in K.

[0052] Based on the insulation dielectric loss calculation formula in the IEC 60287 series standards:

[0053]

[0054] In the formula, W d ω is the dielectric loss per unit length of conductor insulation, W / m; U0 is the voltage to ground, V; arctanδ is the dielectric loss factor of insulation at power frequency and operating temperature; C is the capacitance per unit length of cable, F / m; ω is the angular velocity of the cable.

[0055] Based on the formula for calculating the AC resistance per unit length of a conductor at operating temperature in the IEC 60287 series standards:

[0056]

[0057] In the formula, R is the AC resistance per unit length of the conductor at the highest operating temperature, Ω / m; R′ is the DC resistance per unit length of the conductor at the highest operating temperature, Ω / m; y s y is the skin effect factor; p The proximity effect factor; α 20 θ is the temperature coefficient of the conductor at 20℃, 1 / K; θ is the maximum allowable operating temperature of the submarine cable, ℃; R0 is the resistance of the conductor at 0℃, Ω / m.

[0058] Step S5: Based on verifying the correctness of the three-dimensional model of the submarine cable, the thickness of the attachment material is changed to simulate the effect of different marine organism attachment thicknesses on the current carrying capacity. Simulation calculations are performed on the three-dimensional model of the submarine cable under the conditions of marine organism attachment thickness of 10mm, 20mm, 30mm, 40mm and 50mm respectively to obtain the corresponding three-phase conductor losses. Then, the current carrying capacity is calculated according to the following formula.

[0059]

[0060] In the formula, I iW represents the current-carrying capacity of a single conductor simulated under the thickness of the i-th type of marine organism attachment. i R represents the simulated three-phase conductor loss under the thickness of the i-th type of marine organism attachment, and R is the AC resistance per unit length of the conductor at the highest operating temperature, in Ω / m.

[0061] In this embodiment, based on research on marine organism attachment, the main attachment organisms are algae, scallops, etc., and their main elements are calcium carbonate. Through extensive literature review, the density, resistivity, conductivity, and relative permittivity of marine organism attachments were obtained. Using the calcium material built into the finite element method software, the corresponding thickness parameters were set to simulate marine organism attachment.

[0062] Step S6: Analyze the flow rate under different marine organism attachment thicknesses, calculate the average flow rate under different marine organism attachment thicknesses, and compare it with the flow rate calculated without marine organism attachment to calculate the correction factor:

[0063]

[0064] In the formula, α is the correction coefficient for the impact of marine organism attachment on the carrying capacity; I i Ii represents the current carrying capacity of a single conductor simulated under the thickness of the i-th type of marine organism attachment; I0 represents the current carrying capacity of a single conductor simulated under the condition of no attachment.

[0065] Step S7: Correct the current-carrying capacity calculation formula based on the IEC 60287 series standards using correction factors, and then calculate the current-carrying capacity of the submarine cable with attached marine organisms:

[0066]

[0067] In the formula, I′ is the corrected current carrying capacity, A; Δθ is the conductor temperature rise above ambient temperature, K; R is the AC resistance per unit length of the conductor at the highest operating temperature, Ω / m; W d T1 is the dielectric loss per unit length of conductor insulation, W / m; T2 is the thermal resistance per unit length between a conductor and a metal tube, (K·m) / W; T3 is the thermal resistance per unit length of the inner lining between the metal shield and the armor, (K·m) / W; T4 is the thermal resistance per unit length of the cable outer sheath, (K·m) / W; * To account for the correction value of the external thermal resistance of the cable in air under sunlight, (K·m) / W; n is the number of conductors carrying the load in the cable; λ1 is the ratio of cable sheath loss to total loss of all conductors; λ2 is the ratio of cable armor loss to total loss of all conductors. σ is the outer diameter of the cable (m); σ is the absorption coefficient when sunlight shines on the cable surface; H is the solar radiation intensity.

[0068] In this experiment, the change in current carrying capacity was approximately 0.01A when the thickness of the marine organism attachment changed, which had a negligible impact on the current carrying capacity. After simulation verification with three-core submarine cables of various cross-sections and types, the correction factor α obtained after the correction calculation was 0.985. The final corrected current carrying capacity calculation formula is as follows:

[0069] I′=0.985I z (9)

[0070] In the formula, I′ represents the corrected current carrying capacity.

[0071] This embodiment also provides a current-carrying capacity calculation and correction system for submarine cables with marine organism attachment, including a submarine cable three-dimensional model module, a three-phase conductor loss calculation module, a marine organism attachment simulation module, and a current-carrying capacity correction module. The submarine cable three-dimensional model module establishes a three-dimensional model of the submarine cable based on the acquired environmental information and structural parameters; the three-phase conductor loss calculation module calculates the three-phase conductor loss based on the submarine cable three-dimensional model; the marine organism attachment simulation module simulates the thickness of marine organism attachment; and the current-carrying capacity correction module calculates the current-carrying capacity according to the IEC standard current-carrying capacity calculation formula and corrects the current-carrying capacity through a correction factor.

[0072] In another embodiment, a non-volatile computer storage medium is provided, which stores computer-executable instructions that can execute a current-carrying capacity calculation and correction method for a submarine cable with marine organism attachment in any of the above embodiments.

[0073] This embodiment also provides a computer program virtual device, which includes a computer program stored on a non-volatile computer storage medium. The computer program includes program instructions, which, when executed by a computer, cause the computer to execute a current-carrying capacity calculation and correction method for submarine cables with marine organism attachment as described in the above embodiment.

[0074] This embodiment provides an electronic device, including: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to execute a method for calculating and correcting the current carrying capacity of a submarine cable with marine organism attachment.

[0075] The specific embodiments described above further illustrate the purpose, technical solution, and technical effects of the present invention in detail. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for calculating and correcting the current-carrying capacity of submarine cables under marine organism attachment, characterized in that, The steps are as follows: Step S1: Obtain environmental information on the site topography of the submarine cable and structural data of the J-shaped submarine cable; establish a three-dimensional model of the submarine cable using finite element simulation software; Step S2: Add the corresponding materials and parameters to the 3D model of the submarine cable, add a magnetic field and current, add three coils in the magnetic field, apply an excitation current to each coil, and add Ampere's law to the metal shield and armor. Add current conservation to the metal shield and armor in the current, and ground the bottom metal shield and armor; Step S3: Simulate the three-dimensional model of the submarine cable using finite element software, solve the Maxwell-Ampere equation in the three-dimensional frequency domain, and obtain the three-phase conductor loss. Step S4: Calculate the current carrying capacity under no-attachment conditions based on the three-phase conductor loss, and compare it with the current carrying capacity under no-attachment conditions calculated based on the IEC60287 series standards to verify the correctness of the submarine cable three-dimensional model. Using the calculation results of the IEC60287 series standards as a benchmark, adjust the parameter conditions of the submarine cable three-dimensional model until the error between the current carrying capacity obtained by simulation calculation and the calculation results based on the IEC60287 series standards is within the allowable range, thereby obtaining the submarine cable three-dimensional model calibrated by the IEC standard. Step S5: Based on the three-dimensional model of the submarine cable calibrated according to IEC standards, the corresponding thickness parameters are set using the calcium material built into the finite element software to simulate marine organism attachment. The thickness of the attachment material is changed to simulate the effect of different marine organism attachment thicknesses on the current carrying capacity. The three-dimensional model of the submarine cable is simulated and calculated under the marine organism attachment thickness to obtain its corresponding three-phase conductor loss. The current carrying capacity is calculated based on the three-phase conductor loss. Step S6: Analyze the flow rate under different marine organism attachment thicknesses, calculate the average flow rate under different marine organism attachment thicknesses, and compare it with the flow rate calculated without marine organism attachment to calculate the correction factor: ； In the formula, This is a correction factor for the impact of marine organism attachment on the carrying capacity. The current carrying capacity of a single conductor is simulated under the thickness of the attachment of the i-th type of marine organism. This represents the current carrying capacity of a single conductor obtained from simulations under no-attachment conditions. Step S7: Correct the current carrying capacity calculation formula based on the IEC60287 series standards using the correction factor, and then calculate the current carrying capacity of the submarine cable with attached marine organisms. ； In the formula, This is the corrected current carrying capacity. R represents the temperature rise of the conductor above ambient temperature; R is the AC resistance per unit length of the conductor at the highest operating temperature. Dielectric loss per unit length of conductor insulation; The thermal resistance per unit length between a conductor and a metal tube; The thermal resistance per unit length of the inner lining layer between the metal shield and the armor; Thermal resistance per unit length of the cable's outer sheath; To account for the correction value of the external thermal resistance of the cable in the air under sunlight; n is the number of conductors in the cable carrying the load; This is the ratio of cable sheath loss to total loss of all conductors. This is the ratio of cable armor loss to total loss of all conductors. The outer diameter of the cable; The absorption coefficient is the amount of sunlight that hits the surface of the cable. This represents the intensity of solar radiation.

2. The method for calculating and correcting the current-carrying capacity of submarine cables under marine organism attachment as described in claim 1, characterized in that, The method for calculating the current carrying capacity under no-attachment conditions based on the three-phase conductor losses is as follows: ； In the formula, This represents the current-carrying capacity of a single conductor obtained from simulations under no-attachment conditions. R represents the three-phase conductor loss obtained from simulation under no-attachment conditions, and R is the AC resistance per unit length of the conductor at the highest operating temperature, in Ω / m.

3. The method for calculating and correcting the current-carrying capacity of submarine cables under marine organism attachment as described in claim 1, characterized in that, The current-carrying capacity of a single conductor, simulated under different marine organism attachment thicknesses, is calculated using the following formula: ； In the formula, Let represent the simulated current-carrying capacity of a single conductor under the thickness of the i-th type of marine organism attachment. R represents the simulated three-phase conductor loss under the thickness of the i-th type of marine organism attachment, and R is the AC resistance per unit length of the conductor at the highest operating temperature, in Ω / m.

4. The method for calculating and correcting the current-carrying capacity of submarine cables under marine organism attachment as described in claim 1, characterized in that, Environmental information on the site topography of submarine cables includes direct sunlight temperature, wind speed, and local meteorological data; structural data of submarine cables includes conductor diameter, insulation thickness, armor thickness, inner shield, outer shield, metal shield, PE sheath, inner lining layer, and outer sheath diameter.

5. A current-carrying capacity calculation and correction system for submarine cables with marine organism attachment, characterized in that, Includes a 3D model module for submarine cables, a three-phase conductor loss calculation module, a marine organism attachment simulation module, and a current carrying capacity correction module; The submarine cable 3D model module creates a 3D model of the submarine cable based on the acquired environmental information and structural parameters. The three-phase conductor loss calculation module calculates the three-phase conductor loss based on the three-dimensional model of the submarine cable, calculates the current carrying capacity under no-attachment conditions based on the three-phase conductor loss, and compares it with the current carrying capacity under no-attachment conditions calculated based on the IEC60287 series standards to verify the correctness of the submarine cable three-dimensional model. Based on the calculation results of the IEC60287 series standards, the parameters of the submarine cable three-dimensional model are adjusted until the error between the current carrying capacity calculated by simulation and the calculation results based on the IEC60287 series standards is within the allowable range, thus obtaining the submarine cable three-dimensional model calibrated by the IEC standard. The marine organism attachment simulation module, based on the 3D model of the submarine cable calibrated according to IEC standards, uses the built-in calcium material in the finite element software to set the corresponding thickness parameters to simulate marine organism attachment. It simulates the effect of different marine organism attachment thicknesses on the current carrying capacity by changing the thickness of the attachment material. The 3D model of the submarine cable is simulated and calculated under the marine organism attachment thickness to obtain the corresponding three-phase conductor loss, and the current carrying capacity is calculated based on the three-phase conductor loss. The flow rate correction module is used to analyze the flow rate under different marine organism attachment thicknesses, calculate the average flow rate under different marine organism attachment thicknesses, and compare it with the flow rate calculated without marine organism attachment to calculate the correction coefficient. ； In the formula, This is a correction factor for the impact of marine organism attachment on the carrying capacity. The current carrying capacity of a single conductor is simulated under the thickness of the attachment of the i-th type of marine organism. This represents the current carrying capacity of a single conductor obtained from simulations under no-attachment conditions. The current carrying capacity calculation formula based on the IEC60287 series standards was corrected using a correction factor, and then the current carrying capacity of submarine cables with attached marine organisms was calculated. ； In the formula, This is the corrected current carrying capacity. R represents the temperature rise of the conductor above ambient temperature; R is the AC resistance per unit length of the conductor at the highest operating temperature. Dielectric loss per unit length of conductor insulation; The thermal resistance per unit length between a conductor and a metal tube; The thermal resistance per unit length of the inner lining layer between the metal shield and the armor; Thermal resistance per unit length of the cable's outer sheath; To account for the correction value of the external thermal resistance of the cable in the air under sunlight; n is the number of conductors in the cable carrying the load; This is the ratio of cable sheath loss to total loss of all conductors. This is the ratio of cable armor loss to total loss of all conductors. The outer diameter of the cable; The absorption coefficient is the amount of sunlight that hits the surface of the cable. This represents the intensity of solar radiation.

6. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer can execute instructions to perform the current carrying capacity calculation and correction method for a submarine cable with marine organism attachment as described in claim 1.

7. A computer program virtual device, comprising a computer program stored on a non-volatile computer storage medium, characterized in that, The computer program includes program instructions, which, when executed by the computer, cause the computer to perform the current-carrying capacity calculation and correction method for submarine cables with marine organism attachment as described in claim 1.

8. An electronic device, comprising: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, characterized in that the instructions are executed by the at least one processor to enable the at least one processor to execute the current carrying capacity calculation correction method for a submarine cable with marine organism attachment as described in claim 1.

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