Multi-field coupled lightweight submarine cable current-carrying capacity prediction model construction method
By constructing a lightweight submarine cable current-carrying capacity prediction model with multi-field coupling, and combining U-shaped three-dimensional simulation and optimization technology, the problems of inaccurate current-carrying capacity prediction and circulation loss were solved, achieving accurate prediction and efficient operation.
Patent Information
- Application Number
- CN202511463091.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-14
- Publication Date
- 2026-01-13
AI Technical Summary
Existing submarine cable current carrying capacity prediction models cannot accurately reflect the multi-field coupling effects in actual operation, and traditional test methods are complex and costly. Conventional AC submarine cables also suffer from severe circulating current loss.
A lightweight submarine cable current carrying capacity prediction model with multi-field coupling was constructed. A U-shaped three-dimensional simulation model was used in conjunction with real-time optimization technology. Conductor coating technology and high-strength aluminum alloy wire were used to replace traditional steel wire armor to optimize heat dissipation boundary conditions.
It enables more accurate current carrying capacity prediction, reduces testing costs and time, improves current carrying capacity and operating efficiency, and extends cable service life.
Smart Images
Figure CN121328043A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of submarine cable current carrying capacity prediction technology, and in particular to a method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling. Background Technology
[0002] With the rapid development of marine resource development and new energy projects such as offshore wind power, submarine cables are increasingly widely used in power transmission. 220kV single-core submarine cables, due to their high voltage level and large transmission capacity, have become an important component of offshore power transmission. However, traditional submarine cables have the following problems: 1. Current current current carrying capacity prediction models are mostly based on theoretical calculations and empirical formulas, which are difficult to accurately reflect the multi-field coupling effects in actual operation. These models have certain limitations in practical applications and cannot accurately predict the current carrying capacity of submarine cables under different laying conditions.
[0003] 2. When conducting current-carrying capacity tests on submarine cables, complex testing equipment and setups are usually required, and the test results are affected by a variety of factors, such as the test environment and cable layout. Traditional testing methods are difficult to comprehensively evaluate the performance of submarine cables.
[0004] 3. Existing conventional AC submarine cables typically use lead sheaths and steel wire armor. This structure results in significant circulating current loss, leading to severe cable overheating and limiting the cable's current-carrying capacity. Summary of the Invention
[0005] The purpose of this invention is to provide a method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling, which solves the problems of inaccurate current carrying capacity prediction, high loss, and high verification complexity in the existing technology.
[0006] To achieve the above objectives, this invention provides a method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling, comprising the following steps: Several types of 220kV single-core submarine cable prototypes were selected as test objects, and a three-dimensional simulation model with a U-shaped arrangement was established based on the matching simulation equipment. The first characteristic parameter set is obtained by calculating the first characteristic parameter set in the historical simulation of the three-dimensional simulation model under the direct burial laying condition and the air laying condition. Based on the obtained structural parameters, physical characteristic data, simulation equipment specifications, and first characteristic parameter set of the test object, a multi-field coupled submarine cable current carrying capacity prediction model is constructed. The second characteristic parameters of the three-dimensional simulation model under direct burial and air laying conditions are obtained in real time to obtain the second characteristic parameter set. Based on the second characteristic parameter set, the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model are optimized.
[0007] In some embodiments of this application, the matched simulation equipment includes: power supply, voltage regulator, through-core transformer, current transformer and thermocouple, wherein the structural parameters and physical characteristic data of each simulation equipment are matched with the selected 220kV single-core submarine cable prototype.
[0008] In some embodiments of this application, establishing a three-dimensional simulation model of a U-shaped arrangement based on a matched simulation device includes: Set boundary conditions for direct burial and air-laying conditions in the 3D simulation model; The boundary conditions include soil thermal resistance, air convection coefficient, and ambient temperature, which are used to simulate the heat dissipation conditions in the actual laying environment. Temperature measurement points and current monitoring points are set up in the model to record the temperature distribution and current changes during the simulation process; The temperature measurement points are located at the cable core, the surface of the insulation layer, the sheath layer, and the submarine cable joint. The current monitoring points are located at the input and output ends of the submarine cable, the cable core conductor, the metal sheath, and the armor layer.
[0009] In some embodiments of this application, the first characteristic parameter and the second characteristic parameter both include: temperature distribution parameters and current carrying capacity parameters under direct burial laying conditions and air laying conditions.
[0010] In some embodiments of this application, the first characteristic parameters of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions are calculated to obtain the first characteristic parameter set, which includes: The temperature distribution parameters in the historical simulations of the 3D simulation model under both direct burial and air-laid conditions are calculated using the following expression: f(x,t); in, Let x be the temperature at time t. For ambient temperature, This refers to the heat generated per unit length of the cable. The total thermal resistance of the cable is denoted as , which includes the thermal resistance of the conductor, the thermal resistance of the insulation layer, and the external thermal resistance. f(x,t) is a preset attenuation function. For direct burial installations, the total thermal resistance of the cable for: ; in, For conductor thermal resistance, For the thermal resistance of the insulation layer, For soil thermal resistance; For air-laying applications, the total thermal resistance of the cable for: ; in, The air convection coefficient, This refers to the external heat exchange area of the submarine cable. Calculate the current carrying capacity of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions; For direct burial installations, the expression is: ; in, This represents the maximum current carrying capacity of the cable when directly buried. The maximum allowable temperature rise of the conductor. This represents the total thermal resistance of the cable when it is directly buried. For air-laying applications, the expression is: ; in, This is the maximum current carrying capacity of the cable when laid in air. The total thermal resistance of the cable when laid in air.
[0011] In some embodiments of this application, a multi-field coupled submarine cable current-carrying capacity prediction model is constructed based on the obtained structural parameters of the test object, physical characteristic data, simulation equipment specifications, and a first set of characteristic parameters, including: Structural parameters, physical property data, simulation equipment specifications, temperature distribution parameters, and corresponding current carrying capacity data of multiple test objects in a three-dimensional simulation model were collected, and a regression analysis algorithm was used to fit and obtain the weight coefficient of each parameter. A submarine cable current carrying capacity prediction model is constructed based on various parameters and weighting coefficients, and the expression is: ; in, For the predicted carrying capacity, - All are weighting coefficients. This represents the cross-sectional area of the submarine cable conductor. For conductor resistivity, For the thermal conductivity of insulating materials, For system operating voltage, For the system voltage regulator capacity, This represents the highest temperature of the conductor.
[0012] In some embodiments of this application, optimizing the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model based on the second feature parameter set includes: The second set of characteristic parameters of submarine cables under direct burial and air-laying conditions is acquired in real time. Error analysis is performed between the second set of characteristic parameters and the first set of characteristic parameters. Based on the error analysis results, the soil thermal resistance and air convection coefficient of the submarine cable current carrying capacity prediction model are adjusted.
[0013] In some embodiments of this application, a lightweight submarine cable current-carrying prediction model construction device with multi-field coupling is also disclosed, comprising: The selection module is used to select several types of 220kV single-core submarine cable prototypes as test objects, and to establish a three-dimensional simulation model of a U-shaped arrangement based on the matching simulation equipment. The simulation module is used to calculate the first characteristic parameters of the three-dimensional simulation model in historical simulations under direct burial and air laying conditions, and obtain the first characteristic parameter set. The module is used to construct a multi-field coupled submarine cable current carrying capacity prediction model based on the obtained structural parameters, physical characteristic data, simulation equipment specifications, and first feature parameter set of the test object. The optimization module is used to acquire the second characteristic parameters of the three-dimensional simulation model in real time under the conditions of direct burial and air laying, obtain the second characteristic parameter set, and optimize the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model based on the second characteristic parameter set.
[0014] In some embodiments of this application, the selected module includes: setting boundary conditions for direct burial laying and air laying conditions in a three-dimensional simulation model; The boundary conditions include soil thermal resistance, air convection coefficient, and ambient temperature, which are used to simulate the heat dissipation conditions in the actual laying environment. Temperature measurement points and current monitoring points are set up in the model to record the temperature distribution and current changes during the simulation process; The temperature measurement points are located at the cable core, the surface of the insulation layer, the sheath layer, and the submarine cable joint; the current monitoring points are located at the input and output ends of the submarine cable, the cable core conductor, the metal sheath, and the armor layer. The simulation module includes: calculating the temperature distribution parameters of the 3D simulation model in historical simulations under direct burial and air-laying conditions, expressed as: f(x,t); in, Let x be the temperature at time t. For ambient temperature, This refers to the heat generated per unit length of the cable. The total thermal resistance of the cable is denoted as , which includes the thermal resistance of the conductor, the thermal resistance of the insulation layer, and the external thermal resistance. f(x,t) is a preset attenuation function. For direct burial installations, the total thermal resistance of the cable for: ; in, For conductor thermal resistance, For the thermal resistance of the insulation layer, For soil thermal resistance; For air-laying applications, the total thermal resistance of the cable for: ; in, The air convection coefficient, This refers to the external heat exchange area of the submarine cable. Calculate the current carrying capacity of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions; For direct burial installations, the expression is: ; in, This represents the maximum current carrying capacity of the cable when directly buried. The maximum allowable temperature rise of the conductor. This represents the total thermal resistance of the cable when it is directly buried. For air-laying applications, the expression is: ; in, This is the maximum current carrying capacity of the cable when laid in air. The total thermal resistance of the cable when laid in air; The construction module includes: collecting structural parameters, physical property data, simulation equipment specification parameters, temperature distribution parameters, and corresponding current carrying capacity data of multiple test objects in a three-dimensional simulation model, and using regression analysis algorithm to fit and obtain the weight coefficient of each parameter; A submarine cable current carrying capacity prediction model is constructed based on various parameters and weighting coefficients, and the expression is: ; in, For the predicted carrying capacity, - All are weighting coefficients. This represents the cross-sectional area of the submarine cable conductor. For conductor resistivity, For the thermal conductivity of insulating materials, For system operating voltage, For the system voltage regulator capacity, This is the highest temperature of the conductor; The optimization module includes: real-time acquisition of the second characteristic parameter set of submarine cable under direct burial and air laying conditions, and error analysis between the second characteristic dataset and the first characteristic dataset. Based on the error analysis results, the soil thermal resistance and air convection coefficient of the submarine cable current carrying capacity prediction model are adjusted.
[0015] In some embodiments of this application, a computer-readable storage medium is also disclosed, on which a program is stored. When executed by a processor, the program implements the method for constructing a lightweight submarine cable current-carrying prediction model with multi-field coupling as described in this application.
[0016] The advantages and beneficial effects of this invention compared to the prior art are: 1. This invention constructs a multi-field coupled submarine cable current-carrying capacity prediction model, comprehensively considering the interaction of thermal, electric, and flow fields, which can more accurately reflect the actual operating state of submarine cables under different laying conditions. Compared with traditional models based on theoretical calculations and empirical formulas, the model of this invention can accurately predict the current-carrying capacity of submarine cables, providing a more reliable basis for the design, selection, and operation of submarine cables, and effectively avoiding problems such as cable overheating or insufficient transmission capacity caused by inaccurate current-carrying capacity prediction.
[0017] 2. This invention employs a U-shaped 3D simulation model combined with real-time optimization technology, enabling the simulation of actual submarine cable operation in a virtual environment and allowing for early performance evaluation. This not only reduces reliance on complex testing equipment and setups but also lowers testing costs and time. Optimizing the model using a real-time acquired set of second characteristic parameters ensures the accuracy and reliability of test results. Even under different testing environments and cable layouts, it comprehensively evaluates submarine cable performance, providing strong support for optimized submarine cable design.
[0018] 3. This invention addresses the circulating current loss problem present in existing conventional AC submarine cables by proposing a lightweight design scheme that uses conductor coating technology and high-strength aluminum alloy wire to replace traditional steel wire armor. This not only reduces the cable's weight but also significantly reduces circulating current loss, thereby improving the cable's current-carrying capacity and operating efficiency. Simultaneously, the optimized heat dissipation boundary conditions better adapt to different laying environments, ensuring the cable maintains good heat dissipation performance under various operating conditions, extending the cable's service life and reducing maintenance costs.
[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram illustrating the steps of a method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling in an embodiment of the present invention. Figure 2This is a schematic diagram of a linear arrangement experiment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a U-shaped arrangement experiment according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a single test in an embodiment of the present invention; Figure 5 This is a schematic diagram of the series test circuit structure according to an embodiment of the present invention. Detailed Implementation
[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0023] like Figure 1 As shown, this invention provides a method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling, comprising the following steps: Several types of 220kV single-core submarine cable prototypes were selected as test objects, and a three-dimensional simulation model with a U-shaped arrangement was established based on the matching simulation equipment. The first characteristic parameter set is obtained by calculating the first characteristic parameter set in the historical simulation of the three-dimensional simulation model under the direct burial laying condition and the air laying condition. Based on the obtained structural parameters, physical characteristic data, simulation equipment specifications, and first characteristic parameter set of the test object, a multi-field coupled submarine cable current carrying capacity prediction model is constructed. The second characteristic parameters of the three-dimensional simulation model under direct burial and air laying conditions are obtained in real time to obtain the second characteristic parameter set. Based on the second characteristic parameter set, the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model are optimized.
[0024] In some embodiments of this application, the matched simulation equipment includes: power supply, voltage regulator, through-core transformer, current transformer and thermocouple, wherein the structural parameters and physical characteristic data of each simulation equipment are matched with the selected 220kV single-core submarine cable prototype.
[0025] In some embodiments of this application, establishing a three-dimensional simulation model of a U-shaped arrangement based on a matched simulation device includes: Set boundary conditions for direct burial and air-laying conditions in the 3D simulation model; The boundary conditions include soil thermal resistance, air convection coefficient, and ambient temperature, which are used to simulate the heat dissipation conditions in the actual laying environment. Temperature measurement points and current monitoring points are set up in the model to record the temperature distribution and current changes during the simulation process; The temperature measurement points are located at the cable core, the surface of the insulation layer, the sheath layer, and the submarine cable joint. The current monitoring points are located at the input and output ends of the submarine cable, the cable core conductor, the metal sheath, and the armor layer.
[0026] In some embodiments of this application, the first characteristic parameter and the second characteristic parameter both include: temperature distribution parameters and current carrying capacity parameters under direct burial laying conditions and air laying conditions.
[0027] In some embodiments of this application, the first characteristic parameters of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions are calculated to obtain the first characteristic parameter set, which includes: The temperature distribution parameters in the historical simulations of the 3D simulation model under both direct burial and air-laid conditions are calculated using the following expression: f(x,t); in, Let x be the temperature at time t. For ambient temperature, This refers to the heat generated per unit length of the cable. The total thermal resistance of the cable is denoted as , which includes the thermal resistance of the conductor, the thermal resistance of the insulation layer, and the external thermal resistance. f(x,t) is a preset attenuation function. For direct burial installations, the total thermal resistance of the cable for: ; in, For conductor thermal resistance, For the thermal resistance of the insulation layer, For soil thermal resistance; For air-laying applications, the total thermal resistance of the cable for: ; in, The air convection coefficient, This refers to the external heat exchange area of the submarine cable. Calculate the current carrying capacity of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions; For direct burial installations, the expression is: ; in, This represents the maximum current carrying capacity of the cable when directly buried. The maximum allowable temperature rise of the conductor. This represents the total thermal resistance of the cable when it is directly buried. For air-laying applications, the expression is: ; in, This is the maximum current carrying capacity of the cable when laid in air. The total thermal resistance of the cable when laid in air.
[0028] In the embodiments of this application, three historical simulation test results are presented: (1) Three test subjects are connected in series and arranged in a straight line, such as Figure 2 As shown; use a bare conductor or cable with a current carrying capacity not lower than that of the test object to connect to both ends of the test object to form a circuit, and carry out the test simultaneously.
[0029] (2) Three test objects are connected in series in a U-shape, such as Figure 3 As shown; use a bare conductor or cable with a current carrying capacity not lower than that of the test object to connect to both ends of the test object to form a circuit, and carry out the test simultaneously.
[0030] (3) Each of the three test objects forms a circuit with the connecting conductor, such as Figure 4 As shown; experiments were conducted accordingly.
[0031] Taking a conventional submarine cable as an example, the influence of the test loop temperature field on the conductor temperature is compared under the three arrangement methods mentioned above. Due to the shorter length of the test cable segments, the heat dissipation conditions at both ends of the cable segment are better than in the middle, resulting in significantly lower conductor temperatures at both ends compared to the middle. When the test cable segments are connected in a straight line, the conductor temperature decreases as the length of the vertical segment forming the loop increases. When the vertical segment length is 2m, the conductor temperatures of the three test cable segments are close to the simulation values of the two-dimensional model. The maximum conductor temperature of the two side segments is slightly higher by 0.15℃, and the maximum conductor temperature of the middle cable segment is slightly higher by 0.29℃. When the test cable segments are connected in a U-shape, the conductor temperature of the test cable in the vertical segment is about 0.33℃ higher than the simulation value of the two-dimensional model, while the conductor temperature of the test cable in the horizontal segment is basically equivalent to the simulation value of the two-dimensional model. When current is applied to each cable segment individually, the conductor temperature of the entire cable segment is 1.23℃ lower than the simulation value of the two-dimensional model.
[0032] Comparing the effects of the three arrangement methods on the conductor temperature of the experimental submarine cable, it can be seen that when the three experimental submarine cable segments are connected in a U-shape, the experimental submarine cable segment located in the vertical segment is affected by the temperature field of the horizontal segment, and the conductor temperature is higher; when connected in a straight line, the conductor temperature of the three experimental submarine cable segments is least affected by the test circuit when the vertical segment length is 2m.
[0033] Finally, the vertical segment length of the test circuit under the series-connected straight-line arrangement was optimized. The test circuit consisted of three test submarine cable segments connected in series, arranged in the test hall and buried in the ground respectively, to simulate air and direct burial laying conditions. Inside the test hall, the test submarine cable was placed horizontally on an insulating support, approximately 0.5m above the ground and no less than 2m above the wall. The test circuit layout was as follows. Figure 5 As shown, the vertical section of the test circuit is 2.5m long. The connecting conductor or cable section of the test circuit is kept parallel to the test submarine cable section. The through-core transformer is placed in parallel on the connecting conductor or cable section of the test circuit. When buried in the soil, the test submarine cable is buried at a depth of 1m, basically referring to... Figure 5 The experimental circuit is arranged as shown.
[0034] In some embodiments of this application, a multi-field coupled submarine cable current-carrying capacity prediction model is constructed based on the obtained structural parameters of the test object, physical characteristic data, simulation equipment specifications, and a first set of characteristic parameters, including: Structural parameters, physical property data, simulation equipment specifications, temperature distribution parameters, and corresponding current carrying capacity data of multiple test objects in a three-dimensional simulation model were collected, and a regression analysis algorithm was used to fit and obtain the weight coefficient of each parameter. A submarine cable current carrying capacity prediction model is constructed based on various parameters and weighting coefficients, and the expression is: ; in, For the predicted carrying capacity, - All are weighting coefficients. This represents the cross-sectional area of the submarine cable conductor. For conductor resistivity, For the thermal conductivity of insulating materials, For system operating voltage, For the system voltage regulator capacity, This represents the highest temperature of the conductor.
[0035] In some embodiments of this application, optimizing the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model based on the second feature parameter set includes: The second set of characteristic parameters of submarine cables under direct burial and air-laying conditions is acquired in real time. Error analysis is performed between the second set of characteristic parameters and the first set of characteristic parameters. Based on the error analysis results, the soil thermal resistance and air convection coefficient of the submarine cable current carrying capacity prediction model are adjusted.
[0036] In some embodiments of this application, a lightweight submarine cable current-carrying prediction model construction device with multi-field coupling is also disclosed, comprising: The selection module is used to select several types of 220kV single-core submarine cable prototypes as test objects, and to establish a three-dimensional simulation model of a U-shaped arrangement based on the matching simulation equipment. The simulation module is used to calculate the first characteristic parameters of the three-dimensional simulation model in historical simulations under direct burial and air laying conditions, and obtain the first characteristic parameter set. The module is used to construct a multi-field coupled submarine cable current carrying capacity prediction model based on the obtained structural parameters, physical characteristic data, simulation equipment specifications, and first feature parameter set of the test object. The optimization module is used to acquire the second characteristic parameters of the three-dimensional simulation model in real time under the conditions of direct burial and air laying, obtain the second characteristic parameter set, and optimize the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model based on the second characteristic parameter set.
[0037] In some embodiments of this application, the selected module includes: setting boundary conditions for direct burial laying and air laying conditions in a three-dimensional simulation model; The boundary conditions include soil thermal resistance, air convection coefficient, and ambient temperature, which are used to simulate the heat dissipation conditions in the actual laying environment. Temperature measurement points and current monitoring points are set up in the model to record the temperature distribution and current changes during the simulation process; The temperature measurement points are located at the cable core, the surface of the insulation layer, the sheath layer, and the submarine cable joint; the current monitoring points are located at the input and output ends of the submarine cable, the cable core conductor, the metal sheath, and the armor layer. The simulation module includes: calculating the temperature distribution parameters of the 3D simulation model in historical simulations under direct burial and air-laying conditions, expressed as: f(x,t); in, Let x be the temperature at time t. For ambient temperature, This refers to the heat generated per unit length of the cable. The total thermal resistance of the cable is denoted as , which includes the thermal resistance of the conductor, the thermal resistance of the insulation layer, and the external thermal resistance. f(x,t) is a preset attenuation function. For direct burial installations, the total thermal resistance of the cable for: ; in, For conductor thermal resistance, For the thermal resistance of the insulation layer, For soil thermal resistance; For air-laying applications, the total thermal resistance of the cable for: ; in, The air convection coefficient, This refers to the external heat exchange area of the submarine cable. Calculate the current carrying capacity of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions; For direct burial installations, the expression is: ; in, This represents the maximum current carrying capacity of the cable when directly buried. The maximum allowable temperature rise of the conductor. This represents the total thermal resistance of the cable when it is directly buried. For air-laying applications, the expression is: ; in, This is the maximum current carrying capacity of the cable when laid in air. The total thermal resistance of the cable when laid in air; The construction module includes: collecting structural parameters, physical property data, simulation equipment specification parameters, temperature distribution parameters, and corresponding current carrying capacity data of multiple test objects in a three-dimensional simulation model, and using regression analysis algorithm to fit and obtain the weight coefficient of each parameter; A submarine cable current carrying capacity prediction model is constructed based on various parameters and weighting coefficients, and the expression is: ; in, For the predicted carrying capacity, - All are weighting coefficients. This represents the cross-sectional area of the submarine cable conductor. For conductor resistivity, For the thermal conductivity of insulating materials, For system operating voltage, For the system voltage regulator capacity, This is the highest temperature of the conductor; The optimization module includes: real-time acquisition of the second characteristic parameter set of submarine cable under direct burial and air laying conditions, and error analysis between the second characteristic dataset and the first characteristic dataset. Based on the error analysis results, the soil thermal resistance and air convection coefficient of the submarine cable current carrying capacity prediction model are adjusted.
[0038] In some embodiments of this application, a computer-readable storage medium is also disclosed, on which a program is stored, which, when executed by a processor, implements the method for constructing a lightweight submarine cable current-carrying prediction model with multi-field coupling as described in this application.
[0039] This invention constructs a multi-field coupled submarine cable current-carrying capacity prediction model, comprehensively considering the interaction of thermal, electric, and flow fields, which can more accurately reflect the actual operating state of submarine cables under different laying conditions. Compared with traditional models based on theoretical calculations and empirical formulas, the model of this invention can accurately predict the current-carrying capacity of submarine cables, providing a more reliable basis for the design, selection, and operation of submarine cables, and effectively avoiding problems such as cable overheating or insufficient transmission capacity caused by inaccurate current-carrying capacity prediction. This invention uses a U-shaped three-dimensional simulation model combined with real-time optimization technology to simulate the actual operation of submarine cables in a virtual environment, and evaluate the performance of submarine cables in advance. This not only reduces the dependence on complex test equipment and layout, but also reduces test costs and time. By optimizing the model through the real-time acquisition of the second feature parameter set, the accuracy and reliability of the test results can be ensured. Even under different test environments and cable layout methods, the performance of submarine cables can be comprehensively evaluated, providing strong support for the optimized design of submarine cables.
[0040] 3. This invention addresses the circulating current loss problem present in existing conventional AC submarine cables by proposing a lightweight design scheme that uses conductor coating technology and high-strength aluminum alloy wire to replace traditional steel wire armor. This not only reduces the cable's weight but also significantly reduces circulating current loss, thereby improving the cable's current-carrying capacity and operating efficiency. Simultaneously, the optimized heat dissipation boundary conditions better adapt to different laying environments, ensuring the cable maintains good heat dissipation performance under various operating conditions, extending the cable's service life and reducing maintenance costs.
[0041] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A method for constructing a lightweight submarine cable current-carrying capacity prediction model with multi-field coupling, characterized in that, Includes the following steps: Several types of 220kV single-core submarine cable prototypes were selected as test objects, and a three-dimensional simulation model with a U-shaped arrangement was established based on the matching simulation equipment. The first characteristic parameter set is obtained by calculating the first characteristic parameter set in the historical simulation of the three-dimensional simulation model under the direct burial laying condition and the air laying condition. Based on the obtained structural parameters, physical characteristic data, simulation equipment specifications, and first characteristic parameter set of the test object, a multi-field coupled submarine cable current carrying capacity prediction model is constructed. The second characteristic parameters of the three-dimensional simulation model under direct burial and air laying conditions are obtained in real time to obtain the second characteristic parameter set. Based on the second characteristic parameter set, the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model are optimized.
2. The method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling according to claim 1, characterized in that, The matched simulation equipment includes: power supply, voltage regulator, through-core transformer, current transformer and thermocouple, wherein the structural parameters and physical characteristic data of each simulation equipment are matched with the selected 220kV single-core submarine cable prototype.
3. The method for constructing a lightweight submarine cable current-carrying capacity prediction model with multi-field coupling according to claim 2, characterized in that, The U-shaped three-dimensional simulation model established by the matching-based simulation equipment includes: Set boundary conditions for direct burial and air-laying conditions in the 3D simulation model; The boundary conditions include soil thermal resistance, air convection coefficient, and ambient temperature, which are used to simulate the heat dissipation conditions in the actual laying environment. Temperature measurement points and current monitoring points are set up in the model to record the temperature distribution and current changes during the simulation process; The temperature measurement points are located at the cable core, the surface of the insulation layer, the sheath layer, and the submarine cable joint. The current monitoring points are located at the input and output ends of the submarine cable, the cable core conductor, the metal sheath, and the armor layer.
4. The method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling according to claim 3, characterized in that, The first and second characteristic parameters both include temperature distribution parameters and current carrying capacity parameters under direct burial and air laying conditions.
5. The method for constructing a lightweight submarine cable current-carrying capacity prediction model with multi-field coupling according to claim 4, characterized in that, The calculation of the first characteristic parameter set obtained from the historical simulations of the three-dimensional simulation model under direct burial and air-laying conditions yields the following: The temperature distribution parameters in the historical simulations of the 3D simulation model under both direct burial and air-laid conditions are calculated using the following expression: f(x,t); in, Let x be the temperature at time t. For ambient temperature, This refers to the heat generated per unit length of the cable. The total thermal resistance of the cable is denoted as , which includes the thermal resistance of the conductor, the thermal resistance of the insulation layer, and the external thermal resistance. f(x,t) is a preset attenuation function. For direct burial installations, the total thermal resistance of the cable for: ； in, For conductor thermal resistance, For the thermal resistance of the insulation layer, For soil thermal resistance; For air-laying applications, the total thermal resistance of the cable for: ； in, The air convection coefficient, This refers to the external heat exchange area of the submarine cable. Calculate the current carrying capacity of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions; For direct burial installations, the expression is: ； in, This represents the maximum current carrying capacity of the cable when directly buried. The maximum allowable temperature rise of the conductor. This represents the total thermal resistance of the cable when it is directly buried. For air-laying applications, the expression is: ； in, This is the maximum current carrying capacity of the cable when laid in air. Total thermal resistance of the cable when laid in air.
6. The method for constructing a lightweight submarine cable current-carrying capacity prediction model with multi-field coupling according to claim 5, characterized in that, The construction of a multi-field coupled submarine cable current-carrying capacity prediction model based on the acquired structural parameters, physical characteristic data, simulation equipment specifications, and first characteristic parameter set includes: Structural parameters, physical property data, simulation equipment specifications, temperature distribution parameters, and corresponding current carrying capacity data of multiple test objects in a three-dimensional simulation model were collected, and a regression analysis algorithm was used to fit and obtain the weight coefficient of each parameter. A submarine cable current carrying capacity prediction model is constructed based on various parameters and weighting coefficients, and the expression is: ； in, For the predicted carrying capacity, - All are weighting coefficients. This represents the cross-sectional area of the submarine cable conductor. For conductor resistivity, For the thermal conductivity of insulating materials, For system operating voltage, For the system voltage regulator capacity, This represents the highest temperature of the conductor.
7. The method for constructing a lightweight submarine cable current-carrying capacity prediction model with multi-field coupling according to claim 6, characterized in that, The optimization of the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model based on the second feature parameter set includes: The second set of characteristic parameters of submarine cables under direct burial and air-laying conditions is acquired in real time. Error analysis is performed between the second set of characteristic parameters and the first set of characteristic parameters. Based on the error analysis results, the soil thermal resistance and air convection coefficient of the submarine cable current carrying capacity prediction model are adjusted.
8. A lightweight submarine cable current carrying capacity prediction model construction device with multi-field coupling, characterized in that, include: The selection module is used to select several types of 220kV single-core submarine cable prototypes as test objects, and to establish a three-dimensional simulation model of a U-shaped arrangement based on the matching simulation equipment. The simulation module is used to calculate the first characteristic parameters of the three-dimensional simulation model in historical simulations under direct burial and air laying conditions, and obtain the first characteristic parameter set. The module is used to construct a multi-field coupled submarine cable current carrying capacity prediction model based on the obtained structural parameters, physical characteristic data, simulation equipment specifications, and first feature parameter set of the test object. The optimization module is used to acquire the second characteristic parameters of the three-dimensional simulation model in real time under the conditions of direct burial and air laying, obtain the second characteristic parameter set, and optimize the heat dissipation boundary conditions in the submarine cable current carrying capacity prediction model based on the second characteristic parameter set.
9. The lightweight submarine cable current carrying capacity prediction model construction device with multi-field coupling according to claim 8, characterized in that, The selection module includes: setting boundary conditions for direct burial and air-laying conditions in the three-dimensional simulation model; The boundary conditions include soil thermal resistance, air convection coefficient, and ambient temperature, which are used to simulate the heat dissipation conditions in the actual laying environment. Temperature measurement points and current monitoring points are set up in the model to record the temperature distribution and current changes during the simulation process; The temperature measurement points are located at the cable core, the surface of the insulation layer, the sheath layer, and the submarine cable joint. The current monitoring points are located at the input and output ends of the submarine cable, the cable core conductor, the metal sheath, and the armor layer. The simulation module includes: calculating the temperature distribution parameters of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions, expressed as: f(x,t); in, Let x be the temperature at time t. For ambient temperature, This refers to the heat generated per unit length of the cable. The total thermal resistance of the cable is denoted as , which includes the thermal resistance of the conductor, the thermal resistance of the insulation layer, and the external thermal resistance. f(x,t) is a preset attenuation function. For direct burial installations, the total thermal resistance of the cable for: ； in, For conductor thermal resistance, For the thermal resistance of the insulation layer, For soil thermal resistance; For air-laying applications, the total thermal resistance of the cable for: ； in, The air convection coefficient, This refers to the external heat exchange area of the submarine cable. Calculate the current carrying capacity of the three-dimensional simulation model in historical simulations under direct burial and air-laying conditions; For direct burial installations, the expression is: ； in, This represents the maximum current carrying capacity of the cable when directly buried. The maximum allowable temperature rise of the conductor. This represents the total thermal resistance of the cable when it is directly buried. For air-laying applications, the expression is: ； in, This is the maximum current carrying capacity of the cable when laid in air. The total thermal resistance of the cable when laid in air; The construction module includes: collecting structural parameters, physical property data, simulation equipment specification parameters, temperature distribution parameters, and corresponding current carrying capacity data of multiple test objects in a three-dimensional simulation model, and using a regression analysis algorithm to fit and obtain the weight coefficient of each parameter; A submarine cable current carrying capacity prediction model is constructed based on various parameters and weighting coefficients, and the expression is: ； in, For the predicted carrying capacity, - All are weighting coefficients. This represents the cross-sectional area of the submarine cable conductor. For conductor resistivity, For the thermal conductivity of insulating materials, For system operating voltage, For the system voltage regulator capacity, This is the highest temperature of the conductor; The optimization module includes: acquiring the second set of characteristic parameters of the submarine cable in real time under direct burial and air laying conditions, performing error analysis between the second set of characteristic parameters and the first set of characteristic parameters, and adjusting the soil thermal resistance and air convection coefficient of the submarine cable current carrying capacity prediction model based on the error analysis results.
10. A computer-readable storage medium, characterized in that, It stores a program that, when executed by a processor, implements the method for constructing a lightweight submarine cable current carrying capacity prediction model with multi-field coupling as described in any one of claims 1-7.