A high current carrying performance power supply system and a control method thereof

Abstract

The application relates to the technical field of power supply, in particular to a high-current performance power supply system and a control method thereof. The system comprises a power cable and a circulating cooling part. The power cable comprises a plurality of conductor parts and a plurality of temperature measuring optical fibers. The conductor parts are arranged in an array, the temperature measuring optical fibers are arranged at the junctions of adjacent conductor parts and the central axis of the conductor parts. The outer side of the conductor parts is covered with an inner envelope layer, the outer side of the inner envelope layer is surrounded by a plurality of cooling carrier channels, and the cooling carrier channels are provided with fluid media. The outer side of the cooling carrier channels is covered with an outer envelope layer. The circulating cooling part is communicated with the cooling carrier channels, and the system further comprises a control terminal. The application can detect the temperature of the power cable, control the temperature of the whole power cable by using the fluid media, reduce the influence of temperature on the current-carrying performance, and improve the current-carrying performance.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and specifically to a high current-carrying power supply system and its control method. Background Technology

[0002] In the understanding of traditional power cables, the current-carrying capacity of power cables is fixed, and conventional power cables are easily affected by the temperature of the laying environment, causing changes in the current-carrying capacity and making it impossible to guarantee the stable operation of the power system. Traditional solutions increase the current-carrying capacity of power cables by increasing the conductor cross-section. However, this method of increasing current-carrying capacity has limitations and can easily lead to high power system costs. Summary of the Invention

[0003] The technical problem that the invention aims to solve

[0004] To address the technical problem that the current-carrying capacity of traditional power supply systems is greatly affected by temperature and is difficult to improve, this invention provides a high-current-carrying-performance power supply system and its control method. It consists of an improved power cable and a circulating cooling unit, which can detect the temperature of the power cable and use a control terminal to control the operation of the circulating cooling unit based on the measured temperature data. The overall temperature control of the power cable is achieved by using a fluid medium, which reduces the impact of temperature on current-carrying performance and improves current-carrying performance.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by the present invention is as follows:

[0007] A high current-carrying power supply system includes a power cable and a circulating cooling section. The power cable includes several conductor sections and several temperature-sensing optical fibers. The conductor sections are arranged in a surrounding array, and the temperature-sensing optical fibers are disposed at the junctions of adjacent conductor sections and at the surrounding axis of the conductor sections. Each conductor section is covered by an inner cladding layer, and several cooling carrier channels are arranged around the outer side of the inner cladding layer. A fluid medium is disposed within each cooling carrier channel. Each cooling carrier channel is covered by an outer cladding layer. The circulating cooling section is connected to the cooling carrier channels and includes a control terminal. The temperature-sensing optical fibers are electrically connected to the control terminal, and the circulating cooling section is electrically connected to the control terminal.

[0008] Optionally, one end of an adjacent cooling carrier channel is connected, and the other ends of two adjacent cooling carrier channels are respectively connected to the input and output ends of the circulating cooling section.

[0009] Optionally, the inner cladding layer is provided with a filler, which is distributed in the gap between the conductor portion, the temperature-sensing optical fiber, and the inner cladding layer.

[0010] Optionally, the filler is polypropylene filled rope.

[0011] Optionally, the inner enveloping layer includes a double-sided water-blocking strip, which covers the outer periphery of the conductor portion. An isolation sleeve covers the outside of the double-sided water-blocking strip, and the cooling carrier channel surrounds the outside of the isolation sleeve. The outer enveloping layer includes an inner sheath, which envelops the outside of the cooling carrier channel. A metal armor layer covers the outside of the inner sheath, and an outer sheath covers the outside of the metal armor layer.

[0012] Optionally, the conductor portion includes a wire core conductor, the wire core conductor is surrounded by a conductor shielding layer, the conductor shielding layer is surrounded by a cross-linked polyethylene insulation layer, the cross-linked polyethylene insulation layer is surrounded by an insulating shielding layer, and a metal strip shielding layer is disposed outside the insulating shielding layer, the metal strip shielding layer being in contact with the temperature measuring optical fiber.

[0013] Optionally, the fluid medium is liquid nitrogen.

[0014] Optionally, the cooling carrier channel is an aluminum alloy hollow tube.

[0015] A control method is provided for the aforementioned high current-carrying power supply system. Each of the temperature-sensing optical fibers detects the real-time temperature at different locations on the power cable and feeds it back to a control terminal. The control terminal has a preset operating temperature threshold for the power cable. The control terminal compares the real-time temperature with the operating temperature threshold. When the real-time temperature is lower than the operating temperature threshold, the control terminal controls the circulating cooling unit to operate in standby mode, maintaining a constant circulation flow rate and velocity, with fluid medium flowing through all or part of the cooling carrier channels. When the real-time temperature is greater than or equal to the operating temperature threshold, it is determined that the temperature within a local arc range of the power cable exceeds the operating temperature threshold, or that the overall temperature of the power cable exceeds the operating temperature threshold. When the overall temperature of the power cable exceeds the operating temperature threshold, the control terminal controls the circulating cooling unit. The number of cooling carrier channels through which fluid medium is introduced is uniformly increased in the circumferential direction of the power cable; or the flow rate of the fluid medium in the cooling carrier channels that have already been introduced is increased; or both the number of cooling carrier channels through which fluid medium is introduced is uniformly increased and the flow rate of the fluid medium in the cooling carrier channels that have already been introduced is increased; when cooling is required within a local arc range of the power cable, the control terminal controls the circulating cooling unit to increase the number of cooling carrier channels through which fluid medium is introduced within the local arc range; or the flow rate of the fluid medium in the cooling carrier channels that have already been introduced within the corresponding arc range is increased; or both the number of cooling carrier channels through which fluid medium is introduced within the corresponding arc range is increased and the flow rate of the fluid medium in the cooling carrier channels that have already been introduced is increased.

[0016] Optionally, the input end of each of the cooling carrier channels is connected to the output end of each of the circulating cooling units, and the control terminal controls the opening and closing of each output end of the circulating cooling unit to control the number of cooling carrier channels through which the fluid medium is introduced.

[0017] Beneficial effects

[0018] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0019] To address the technical problem that the current-carrying capacity of traditional power supply systems is greatly affected by temperature and is difficult to improve, this invention consists of an improved power cable and a circulating cooling unit. It can detect the temperature of the power cable and use a control terminal to control the operation of the circulating cooling unit based on the measured temperature data. By using a fluid medium, the overall temperature of the power cable is controlled, reducing the impact of temperature on current-carrying performance and improving current-carrying performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the power cable proposed in an embodiment of the present invention. Detailed Implementation

[0021] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection 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. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0023] Example 1

[0024] Combined with appendix Figure 1 This embodiment proposes a high current-carrying power supply system, including a power cable and a circulating cooling section. The power cable includes several conductor sections 100 and several temperature-sensing optical fibers 6. The conductor sections 100 are arranged in a surrounding array, and the temperature-sensing optical fibers 6 are disposed at the junctions of adjacent conductor sections 100 and the surrounding axis of the conductor sections 100. The conductor sections 100 are covered with an inner cladding layer 200, and several cooling carrier channels 10 are arranged around the outer side of the inner cladding layer 200. A fluid medium is disposed in the cooling carrier channels 10. The cooling carrier channels 10 are covered with an outer cladding layer 300. The circulating cooling section is connected to the cooling carrier channels 10 and also includes a control terminal. The temperature-sensing optical fibers 6 are electrically connected to the control terminal, and the circulating cooling section is electrically connected to the control terminal.

[0025] This embodiment of a high current-carrying power supply system consists of an improved power cable and a circulating cooling section. It can detect the temperature of the power cable and use a control terminal to control the operation of the circulating cooling section based on the measured temperature data. The system uses a fluid medium to achieve overall temperature control of the power cable, thereby reducing the impact of temperature on current-carrying performance.

[0026] The power cable in this embodiment improves upon the traditional cable structure. Through the reasonable layout of the temperature-sensing optical fiber 6, it better detects the temperature of the multi-core cable. The cooling carrier channel 10 carries the fluid medium, which controls the temperature of the conductor 100 within a suitable working range, reducing the influence of ambient temperature and working temperature and improving current-carrying performance.

[0027] In this embodiment, the conductor section 100 is provided with multiple paths to ensure that the power cable has a large current-carrying capacity. The conductor sections 100 are arranged in a surrounding array to make the overall structure of the power cable more compact and reasonable. In one embodiment, the conductor section 100 has at least three paths, and the temperature-sensing optical fiber 6 is correspondingly arranged with three paths surrounding the conductor section 100 and one path located at the center of the surrounding array, for a total of four paths.

[0028] Based on the surrounding array arrangement of the conductor section 100, this embodiment further improves the layout of the temperature-sensing fiber 6. The temperature-sensing fiber 6 is arranged at the junction of adjacent conductor sections 100 and at the surrounding axis of the conductor section 100. This arrangement is beneficial to achieve more accurate temperature detection as follows: (2) The temperature-sensing fiber 6 is arranged at the junction of adjacent conductor sections 100, so the temperature of each group of conductor sections 100 can be detected by taking adjacent conductor sections 100 as a group; (2) The temperature-sensing fiber 6 is arranged at the surrounding axis of the body, so the center temperature of the entire conductor section 100 can be accurately measured; (3) Since some of the temperature-sensing fibers 6 are arranged at the junction of adjacent conductor sections 100, it is also equivalent to a surrounding array arrangement. Therefore, the temperature-sensing fiber 6 can also detect the temperature at various points within the local arc range of the power cable, so as to further determine the temperature distribution on the overall circumference of the power cable.

[0029] In this embodiment, the inner cladding layer 200 is used to enclose the conductor portion 100 arranged around the array and the corresponding temperature measuring optical fiber 6, so that the layout of the two is wrapped and fixed, and also plays a certain protective role.

[0030] In this embodiment, a plurality of cooling carrier channels 10 are arranged around the outer side of the inner cladding layer 200. The fluid medium within the cooling carrier channels 10 can carry away the heat of the conductor section 100 through its own flow, so that the temperature of the conductor section 100 is maintained within a suitable operating temperature range, thereby further improving the current carrying capacity of the power cable and providing better temperature adaptability. It is conceivable that a circulating cooling unit is connected to the cooling carrier channels 10. The circulating cooling unit can be a conventional liquid cooling circulation device or a gas circulation device, and the fluid medium achieves circulating cooling through the circulating cooling unit.

[0031] In this embodiment, the temperature data of the temperature-sensing optical fiber 6 is collected by the control terminal, and the control terminal adjusts the operation of the circulating cooling unit according to the temperature data. The control terminal is conceivably an industrial controller, such as an MCU, PLC, or various single-chip microcomputers. The circulating cooling unit works in conjunction with the temperature-sensing optical fiber 6, which monitors the temperature of the entire power cable and its internal conductor section 100 in real time. The temperature-sensing optical fiber 6 is connected to the control terminal, which adjusts the operating conditions of the circulating cooling unit based on the temperature information transmitted by the temperature-sensing optical fiber 6. For example, it adjusts the flow rate of the fluid medium in the cooling carrier channel 10, or changes the number of cooling carrier channels 10 to regulate the flow rate of the fluid medium within the power cable. This ensures that the overall temperature of the power cable is always within a suitable operating temperature range, and thus maintains a suitable temperature difference between the overall temperature of the power cable and the ambient temperature, thereby ensuring the high current-carrying capacity of the power cable.

[0032] When a high current-carrying power supply system is operating, not all cooling carrier channels 10 are circulated with fluid. As long as the power cable temperature meets the operating requirements, some cooling carrier channels 10 may not circulate with fluid. During the adjustment of the power cable temperature, the temperature within a local arc range of the power cable, as well as the overall temperature of the power cable, can be adjusted.

[0033] The working method of the high current carrying capacity power supply system is as follows: each temperature measuring fiber 6 detects the real-time temperature at different locations of the power cable and feeds it back to the control terminal. The control terminal has a preset operating temperature threshold for the power cable and compares the real-time temperature with the operating temperature threshold.

[0034] When the real-time temperature is lower than the operating temperature threshold, the control terminal controls the circulating cooling unit to standby mode. The circulating cooling unit controls the circulation flow rate and circulation velocity to remain constant, and fluid medium flows through all or part of the cooling carrier channel 10.

[0035] When the real-time temperature is greater than or equal to the operating temperature threshold, it is determined that the temperature within the local arc range of the power cable is greater than the operating temperature threshold, or the overall temperature of the power cable is greater than the operating temperature threshold.

[0036] When the overall temperature of the power cable exceeds the operating temperature threshold, the control terminal controls the circulating cooling section to uniformly increase the number of cooling carrier channels 10 through which fluid medium is introduced in the circumferential direction of the power cable; or to increase the flow rate of the fluid medium in the cooling carrier channels 10 through which fluid medium is introduced; or to both uniformly increase the number of cooling carrier channels 10 through which fluid medium is introduced and increase the flow rate of the fluid medium in the cooling carrier channels 10 through which fluid medium is introduced.

[0037] When it is necessary to cool down a local arc range of the power cable, the control terminal controls the circulating cooling unit to increase the number of cooling carrier channels 10 through which fluid medium is introduced within the local arc range; or to increase the flow rate of the fluid medium in the cooling carrier channels 10 that have already been introduced within the corresponding arc range; or to both increase the number of cooling carrier channels 10 through which fluid medium is introduced within the corresponding arc range and increase the flow rate of the fluid medium in the cooling carrier channels 10 that have already been introduced.

[0038] As the primary carrier of power transmission, the current-carrying capacity of power cables is correlated with their laying environment. Different laying environments result in different initial operating temperatures for power cables. Factors affecting the current-carrying capacity of power cables include the temperature difference between the power cable and the ambient temperature; increasing the temperature difference increases the cable's current-carrying capacity. Therefore, this embodiment of a high-current-carrying-capacity power supply system can measure the ambient temperature and the temperature of the power cable itself using a temperature-sensing optical fiber 6. By utilizing a cooling carrier channel 10 and its internal fluid medium, the overall temperature of the power cable can be controlled, thereby reducing the impact of temperature rise during power transmission and the influence of the ambient temperature, improving the current-carrying capacity of the power cable, and enhancing overall safety and stability.

[0039] As an optional implementation of this embodiment, one end of each adjacent cooling carrier channel 10 is connected, and the other ends of two adjacent cooling carrier channels 10 are respectively connected to the input and output ends of the circulating cooling section. In this embodiment, the adjacent cooling carrier channels 10 are connected at one end, and the other ends of two adjacent cooling carrier channels 10 are respectively connected to the input and output ends of the circulating cooling section, thereby forming a circulation loop, allowing the fluid medium to circulate and cool, and facilitating the connection layout between the circulating cooling section and the cooling carrier channels 10.

[0040] As an optional implementation of this embodiment, a filler 7 is disposed within the inner cladding layer 200, and the filler 7 is distributed within the gaps between the conductor portion 100, the temperature-sensing optical fiber 6, and the inner cladding layer 200. In this embodiment, the filler 7 is disposed within the gaps between the conductor portion 100, the temperature-sensing optical fiber 6, and the inner cladding layer 200, thereby maintaining a stable arrangement of the conductor portion 100 and the temperature-sensing optical fiber 6 and improving the stability of the structure.

[0041] As an optional implementation method in this embodiment, the filler 7 is a polypropylene filler rope. This embodiment is one way of setting the filler 7. Selecting polypropylene filler rope as the filler 7 provides good flexibility, is suitable for the application scenarios of cables, and matches the flexibility required for power cables.

[0042] As an optional implementation of this embodiment, the inner cladding layer 200 includes a double-sided water-blocking tape 8, which covers the outer periphery of the conductor portion 100. An isolation sleeve 9 covers the outer side of the double-sided water-blocking tape 8, and the cooling carrier channel 10 surrounds the outer side of the isolation sleeve 9. The outer cladding layer 300 includes an inner sheath 11, which covers the outer side of the cooling carrier channel 10. A metal armor layer 12 covers the outer side of the inner sheath 11, and an outer sheath 13 covers the outer side of the metal armor layer 12. This embodiment relates to one configuration of the inner cladding layer 200, wherein the double-sided water-blocking tape 8 is mainly composed of polyester fiber nonwoven fabric, adhesive, high-speed expanding water-absorbing resin, etc. The double-sided water-blocking tape 8 covers the outer periphery of the conductor portion 100 and can absorb moisture that may be generated during the heating and cooling process, preventing moisture from entering the interior of the power cable and causing metal oxidation. The double-sided water-blocking strip 8 is covered with an isolation sleeve 9, and the cooling carrier channel 10 is surrounded by the isolation sleeve 9. The isolation sleeve 9 plays a certain role in isolation and protection, preventing the cooling carrier channel 10 from being worn by the double-sided water-blocking strip 8, or the internal conductor part 100, temperature measuring optical fiber 6 and other structures.

[0043] This embodiment also relates to a configuration of the outer cladding layer 300, wherein the inner sheath 11 serves as a structure that isolates the metal armor layer 12 from the cooling carrier channel 10, preventing them from wearing each other. It is conceivable that the inner sheath 11 can be made of different materials depending on the application environment. For example, when used in densely populated areas, halogen-free, low-smoke, flame-retardant polyolefin materials should be used.

[0044] In this embodiment, a metal armor layer 12 is wrapped around the outer side of the inner sheath 11. Since the material of the temperature measuring fiber 6 is not resistant to bending, the addition of a metal armor layer 12 to the outside of the temperature measuring fiber 6 greatly improves the bending resistance of the temperature measuring fiber 6.

[0045] In this embodiment, the outer sheath 13 is the outer surface of the power cable. It is conceivable that the outer sheath 13 can be made of different materials depending on the usage environment. For example, when used in densely populated areas, halogen-free, low-smoke, flame-retardant polyolefin materials should be used.

[0046] As an optional implementation of this embodiment, the conductor portion 100 includes a core conductor 1, a conductor shielding layer 2 surrounding the core conductor 1, a cross-linked polyethylene insulation layer 3 surrounding the conductor shielding layer 2, an insulating shielding layer 4 surrounding the cross-linked polyethylene insulation layer 3, and a metal strip shielding layer 5 disposed outside the insulating shielding layer 4. The metal strip shielding layer 5 is in contact with the temperature-sensing optical fiber 6. This embodiment is one implementation of the conductor portion 100, where the core conductor 1 is used for electrical energy transmission. The conductor shielding layer 2, made of cross-linked semi-conductive shielding material, surrounds the core conductor 1 to homogenize the electric field on the conductor surface. The cross-linked polyethylene insulation layer 3 surrounds the conductor shielding layer 2, and the insulating shielding layer 4 surrounds the cross-linked polyethylene insulation layer 3 to achieve an insulating shielding effect.

[0047] A metal strip shielding layer 5 is provided on the outside of the insulating shielding layer 4. The metal strip shielding layer 5 is preferably made of copper strip to shield electromagnetic interference and serve as a channel for carrying short-circuit current. The temperature-sensing optical fiber 6 is in contact with the metal strip shielding layer 5. The metal has good thermal conductivity and can better transfer the heat of the conductor part 100 to better monitor the operating temperature of each core conductor 1.

[0048] As an optional implementation method in this embodiment, the fluid medium is liquid nitrogen.

[0049] As an optional implementation method in this embodiment, the cooling carrier channel 10 is an aluminum alloy hollow tube. This embodiment is a preferred configuration of the cooling carrier channel 10, in which the cooling carrier channel 10 is an aluminum alloy hollow tube to serve as a flow channel for the fluid medium. The aluminum alloy hollow tube has certain tensile strength, which can ensure the integrity of the cooling carrier channel 10.

[0050] Example 2

[0051] In conjunction with Embodiment 1, this embodiment proposes a control method for a high current-carrying power supply system of Embodiment 1. Each of the temperature-measuring optical fibers 6 detects the real-time temperature at different locations of the power cable and feeds it back to the control terminal. The control terminal has a preset operating temperature threshold for the power cable, and the control terminal compares the real-time temperature with the operating temperature threshold.

[0052] When the real-time temperature is lower than the working temperature threshold, the control terminal controls the circulating cooling unit to standby, and the circulating cooling unit controls the circulation flow rate and circulation velocity to remain constant. All or part of the cooling carrier channel 10 is filled with fluid medium.

[0053] When the real-time temperature is greater than or equal to the operating temperature threshold, it is determined that the temperature within the local arc range of the power cable is greater than the operating temperature threshold, or the overall temperature of the power cable is greater than the operating temperature threshold.

[0054] When the overall temperature of the power cable exceeds the operating temperature threshold, the control terminal controls the circulating cooling section to uniformly increase the number of cooling carrier channels 10 through which the fluid medium is introduced in the circumferential direction of the power cable; or to increase the flow rate of the fluid medium in the cooling carrier channels 10 through which the fluid medium has been introduced; or to both uniformly increase the number of cooling carrier channels 10 through which the fluid medium is introduced and increase the flow rate of the fluid medium in the cooling carrier channels 10 through which the fluid medium has been introduced.

[0055] When it is necessary to cool down a local arc range of the power cable, the control terminal controls the circulating cooling unit to increase the number of cooling carrier channels 10 through which fluid medium is introduced within the local arc range; or to increase the flow rate of the fluid medium in the cooling carrier channels 10 that have already been introduced within the corresponding arc range; or to both increase the number of cooling carrier channels 10 through which fluid medium is introduced within the corresponding arc range and increase the flow rate of the fluid medium in the cooling carrier channels 10 that have already been introduced.

[0056] As an optional implementation of this embodiment, the input end of each cooling carrier channel 10 is connected to the output end of each circulating cooling unit, and the control terminal controls the opening and closing of each output end of the circulating cooling unit to control the number of cooling carrier channels 10 through which the fluid medium is introduced.

[0057] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high current-carrying power supply system, characterized in that, Includes power cables and circulating cooling units; The power cable includes several conductor sections and several temperature-sensing optical fibers; the conductor sections are arranged in a surrounding array, and the temperature-sensing optical fibers are located at the junctions of adjacent conductor sections and around the axis of the conductor sections; each conductor section is covered by an inner cladding layer, and several cooling carrier channels are arranged around the outer side of the inner cladding layer, each group of cooling carrier channels corresponding to a local arc region of the cable circumference; the input end of each cooling carrier channel is connected to each output end of the circulating cooling section, and the control terminal controls the opening and closing of each output end of the circulating cooling section and controls the number of cooling carrier channels through which the fluid medium is introduced; The cooling carrier channel is provided with a fluid medium; the cooling carrier channel is covered with an outer envelope layer. The circulating cooling section is connected to the cooling carrier channel and also includes a control terminal. The temperature measuring optical fiber is electrically connected to the control terminal.

2. The high current-carrying capacity power supply system according to claim 1, characterized in that, One end of each adjacent cooling carrier channel is connected, and the other ends of the two adjacent cooling carrier channels are respectively connected to the input and output ends of the circulating cooling section.

3. The high current-carrying capacity power supply system according to claim 1, characterized in that, The inner cladding layer is provided with a filler material, which is distributed in the gap between the conductor, the temperature measuring optical fiber and the inner cladding layer.

4. A high current-carrying power supply system according to claim 3, characterized in that, The filler is polypropylene filled rope.

5. A high current-carrying power supply system according to claim 1, characterized in that, The inner cladding layer includes a double-sided water-blocking strip, which covers the outer periphery of the conductor portion. An isolation sleeve covers the outside of the double-sided water-blocking strip, and the cooling carrier channel surrounds the outside of the isolation sleeve. The outer envelope layer includes an inner sheath that encloses the outside of the cooling carrier channel. The outer side of the inner sheath is covered with a metal armor layer, and the outer side of the metal armor layer is covered with an outer sheath.

6. A high current-carrying power supply system according to claim 1, characterized in that, The conductor portion includes a wire core conductor, a conductor shielding layer is wrapped around the outside of the wire core conductor, a cross-linked polyethylene insulation layer is wrapped around the outside of the conductor shielding layer, an insulating shielding layer is wrapped around the outside of the cross-linked polyethylene insulation layer, and a metal strip shielding layer is disposed outside the insulating shielding layer, the metal strip shielding layer being in contact with the temperature measuring optical fiber.

7. A high current-carrying power supply system according to claim 1, characterized in that, The fluid medium is liquid nitrogen.

8. A high current-carrying power supply system according to claim 1, characterized in that, The cooling carrier channel is an aluminum alloy hollow tube.

9. A control method for a high current-carrying power supply system according to any one of claims 1-8, characterized in that, Each of the temperature-measuring optical fibers detects the real-time temperature at different locations of the power cable and feeds it back to the control terminal. The control terminal has a preset operating temperature threshold for the power cable and compares the real-time temperature with the operating temperature threshold. When the real-time temperature is lower than the operating temperature threshold, the control terminal controls the circulating cooling unit to standby, and the circulating cooling unit controls the circulating flow rate and circulating speed to remain constant, with fluid medium flowing in all or part of the cooling carrier channels. When the real-time temperature is greater than or equal to the operating temperature threshold, it is determined that the temperature within the local arc range of the power cable is greater than the operating temperature threshold, or the overall temperature of the power cable is greater than the operating temperature threshold. When the overall temperature of the power cable exceeds the operating temperature threshold, the control terminal controls the circulating cooling section to uniformly increase the number of cooling carrier channels through which the fluid medium is introduced in the circumferential direction of the power cable; or to increase the flow rate of the fluid medium in the cooling carrier channels through which the fluid medium has been introduced. Alternatively, the number of cooling carrier channels into which the fluid medium is introduced can be increased uniformly, while the flow rate of the fluid medium in the cooling carrier channels into which the fluid medium has already been introduced can be increased. When it is necessary to cool down a local arc range of a power cable, the control terminal controls the circulating cooling unit to increase the number of cooling carrier channels through which fluid medium is introduced within the local arc range; or to increase the flow rate of the fluid medium in the cooling carrier channels that have already been introduced within the corresponding arc range. Alternatively, it can both increase the number of cooling carrier channels through which fluid medium is introduced within the corresponding arc range, and increase the flow rate of the fluid medium in the cooling carrier channels through which fluid medium has already been introduced.

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