A current sharing method, device and system for double string operation of power transmission cable lines

Abstract

The present application relates to the technical field of current regulation, and discloses a current sharing method, device and system for double-pair operation of power transmission cable lines. A plurality of non-switched impedance units are installed on each cable line of the double-pair power transmission cable line. Whether current sharing control is needed is determined according to current data of the double-pair operation of the power transmission cable line. When current sharing control is needed, the number of switched impedance units is determined according to the current difference between the two cable lines of the power transmission cable line. Then, the corresponding number of impedance units on the cable line with higher current value are switched according to the number. The present application can effectively regulate the current inside the distribution cable line to achieve current sharing, without power-off operation, without affecting the normal operation of the line and the normal work of the load, and can solve the technical problems of the current sharing method of the existing double-pair cable line, such as the inconvenience of directly connecting impedance in the operation process and adjusting the impedance value.

Description

Technical Field

[0001] This invention relates to the field of current regulation technology, and in particular to a current sharing method, device and system for dual-operation of power transmission cable lines. Background Technology

[0002] Due to the limitation of their maximum current carrying capacity, a single power transmission cable line often cannot meet the load demand. To increase the current carrying capacity, two cables are used in parallel, forming a double-cable line. Because of the differences in line parameters and installation location between the two cables, the output current of the two cables becomes unbalanced during operation. This can cause the cable with the larger output current to fail prematurely, affecting the safe and stable operation of the power transmission cable line.

[0003] In related technologies, current sharing in dual-operation transmission cables is achieved by changing the impedance of the cable line. However, this method requires the transmission cable line to be in a non-operational state, and it is not possible to directly connect impedance devices during operation. Furthermore, the impedance value is not easy to adjust, making adjustment quite difficult. Summary of the Invention

[0004] This invention provides a current sharing method, device, and system for double-span operation of power transmission cable lines, which solves the technical problems of existing current sharing methods for double-span cable lines not being able to directly connect impedance during operation and the inconvenience of impedance value adjustment.

[0005] The first aspect of this invention provides a current-sharing method for dual-operation of power transmission cable lines, wherein the power transmission cable lines include two cable lines operating in parallel, each cable line having multiple unswitched impedance units installed, and the method includes:

[0006] The receiver receives current data collected by the current acquisition unit during the operation of the power transmission cable line, and the current data includes the current of each cable line.

[0007] Determine whether current sharing control is needed based on the difference in current between the two cable lines. If so, determine the number of impedance units to be switched based on the difference in current.

[0008] Based on the number of impedance units switched, a corresponding number of impedance units on the cable line with a higher current value are switched.

[0009] According to one achievable method of the first aspect of the present invention, the step of determining whether current sharing control is required based on the difference in current between the two cable lines includes:

[0010] The current imbalance of the power transmission cable line is calculated based on the difference in current between the two cable lines.

[0011] When the current imbalance meets the preset threshold range, it is determined that current sharing control is required.

[0012] According to one feasible method of the first aspect of the present invention, calculating the current imbalance of the transmission cable line based on the difference in current between the two cable lines includes:

[0013] The current imbalance of the power transmission cable line is calculated using the following formula:

[0014]

[0015] In the formula, η represents the current imbalance of the transmission cable line, ΔI is the difference in current between the two cable lines, and I r This refers to the rated current of a single cable line.

[0016] According to one embodiment of the first aspect of the invention, the impedance unit comprises a capacitor, a switching circuit, and an impedance coupling coil wound around a corresponding cable line, connected in sequence, wherein determining the number of impedance units switched based on the difference in current comprises:

[0017] The number of impedance elements to be switched is calculated using the following formula:

[0018]

[0019] In the formula, n c The input represents the number of impedance elements switched on and off, k is the number of turns in the impedance coupling coil, ω is the power frequency angular frequency, C is the capacitance of the capacitor, U is the operating voltage of the transmission cable line, η represents the current imbalance of the transmission cable line, and I... r This refers to the rated current of a single cable line.

[0020] According to one achievable method of the first aspect of the present invention, the switching of a corresponding number of impedance units on a cable line with a high current value includes:

[0021] The corresponding number of switching circuits on the cable line with a high control current value are in the closed state.

[0022] A second aspect of the present invention provides a current sharing device for dual-operation of power transmission cable lines, comprising:

[0023] A memory for storing instructions; wherein the instructions are instructions capable of implementing the current sharing method for double-unit operation of power transmission cable lines as described in any of the above-mentioned methods;

[0024] A processor for executing instructions in the memory.

[0025] A third aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the current sharing method for dual-operation of power transmission cable lines as described in any of the above embodiments.

[0026] A fourth aspect of the present invention provides a current-sharing system for dual-operation of power transmission cable lines, the power transmission cable lines comprising two cable lines operating in parallel, the system comprising:

[0027] A current acquisition unit is used to acquire current data collected during the operation of the power transmission cable, including the current of each cable line.

[0028] Impedance units, with multiple unswitched impedance units installed on each cable line;

[0029] The current sharing control unit is used to receive the current data, determine whether current sharing control is needed based on the difference in current between the two cable lines, and if so, determine the number of impedance units to be switched based on the difference in current; and switch the corresponding number of impedance units on the cable line with the higher current value based on the number of impedance units to be switched.

[0030] According to one embodiment of the fourth aspect of the present invention, the current sharing control unit includes a determination module for determining whether current sharing control is required based on the difference in current between two cable lines, the determination module comprising:

[0031] The calculation submodule is used to calculate the current imbalance of the power transmission cable line based on the difference in current between the two cable lines.

[0032] The determination submodule is used to determine whether current sharing control is required when the current imbalance meets a preset threshold range.

[0033] According to one achievable method of the fourth aspect of the present invention, the computing submodule is specifically used for:

[0034] The current imbalance of the power transmission cable line is calculated using the following formula:

[0035]

[0036] In the formula, η represents the current imbalance of the transmission cable line, ΔI is the difference in current between the two cable lines, and I r This refers to the rated current of a single cable line.

[0037] According to one embodiment of the fourth aspect of the present invention, the impedance unit includes a capacitor, a switching circuit, and an impedance coupling coil wound on a corresponding cable line connected in sequence. The current sharing control unit further includes a determining module for determining the number of impedance units to be switched based on the difference in the currents. The determining module is specifically used for:

[0038] The number of impedance elements to be switched is calculated using the following formula:

[0039]

[0040] In the formula, n c The number of impedance units switched is indicated by k, the number of turns of the impedance coupling coil is k, the power frequency angular frequency is ω, the capacitance of the capacitor is C, and the operating voltage of the power transmission cable line is U.

[0041] According to one embodiment of the fourth aspect of the invention, the current sharing control unit further includes a control module for switching a corresponding number of impedance units on a cable line with a high current value, the control module specifically being used for:

[0042] The corresponding number of switching circuits on the cable line with a high control current value are in the closed state.

[0043] According to one embodiment of the fourth aspect of the present invention, the current acquisition unit comprises:

[0044] A current sensor used to collect the current in a single cable line.

[0045] According to one embodiment of the fourth aspect of the present invention, the current sharing control unit includes a battery module, and the system further includes:

[0046] The power harvesting unit includes a magnetic core with a coil wound around it and a power management module; the magnetic core is installed on a single cable line, the output end of the coil is connected to the input end of the power management module, and the output end of the power management module is connected to the battery module.

[0047] As can be seen from the above technical solutions, the present invention has the following advantages:

[0048] This invention installs multiple unswitched impedance units on each cable of a double-span transmission cable line. Based on the current data during the double-span operation of the transmission cable line, it determines whether current sharing control is required. When current sharing control is needed, the number of impedance units to be switched is determined based on the current difference between the two cable lines. Then, the corresponding number of impedance units on the cable line with the higher current value are switched according to the number of switches. This invention can effectively regulate and distribute the current within the cable line to achieve current sharing without requiring power outages, and will not affect the normal operation of the line or the normal operation of the load. It solves the technical problems of existing current sharing methods for double-span cable lines, such as the inability to directly connect impedances during operation and the inconvenience of impedance value adjustment. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A structural connection block diagram of a current sharing system for dual-operation of power transmission cable lines is provided as an optional embodiment of the present invention;

[0051] Figure 2 A schematic diagram of the operation of a current sharing system for dual-operation of power transmission cable lines is provided as an optional embodiment of the present invention;

[0052] Figure 3 A flowchart of a current-sharing method for dual-operation of power transmission cable lines, provided as an optional embodiment of the present invention;

[0053] Figure label:

[0054] 1-Current acquisition unit; 2-Impedance unit; 3-Current sharing control unit; 4-Energy harvesting unit; CT-Current sensor; C1-Capacitor; S1-Switching circuit; T1-Impedance coupling coil. Detailed Implementation

[0055] This invention provides a current sharing method, device, and system for double-segment operation of power transmission cable lines, which solves the technical problems of existing current sharing methods for double-segment cable lines not being able to directly connect impedance during operation and the inconvenience of impedance value adjustment.

[0056] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0057] This invention provides a current-sharing system for dual-operation of power transmission cable lines. The power transmission cable line comprises two cable lines used in parallel, namely a first cable line and a second cable line.

[0058] Please see Figure 1 , Figure 1 The diagram shows a structural connection block diagram of a current sharing system for dual-operation of power transmission cable lines provided by an embodiment of the present invention.

[0059] The flow sharing system provided in this embodiment of the invention includes:

[0060] The current acquisition unit 1 is used to acquire current data collected during the operation of the power transmission cable, and the current data includes the current of each cable line.

[0061] Impedance unit 2, n unswitched impedance units 2 are installed on each cable line;

[0062] The current sharing control unit 3 is used to receive the current data, determine whether current sharing control is needed based on the difference in current between the two cable lines, and if so, determine the number of impedance units 2 to be switched based on the difference in current; and switch the corresponding number of impedance units 2 on the cable line with the higher current value based on the number of impedance units 2 to be switched.

[0063] In one implementation, the current acquisition unit 1 includes a current sensor CT for acquiring the current of a single cable line. For example... Figure 2 As shown, a current sensor (CT) is installed on each cable line. This CT measures the current flowing through the cable line during operation based on the principle of electromagnetic induction. Its internal structure consists of a magnetic ring with a certain number of turns. When the cable line is running, the power frequency current flows through the cable conductor, generating an alternating power frequency magnetic field around the cable. Because the magnetic reluctance of the magnetic ring inside the CT is much smaller than the magnetic reluctance of the cable's insulation medium and air, most of the alternating magnetic field is concentrated inside the magnetic ring, thus inducing a voltage on the windings of the magnetic ring. The magnitude of the current inside the cable line can be determined by measuring the magnitude of the induced voltage in the CT.

[0064] The current sharing control unit 3, after receiving the current data, calculates the difference between the currents of the two cable lines in the current data, and then determines whether current sharing control is needed based on the difference. Since current imbalance can lead to a significant current difference between the two cables, in specific implementation, a corresponding current sharing control judgment mechanism can be set, for example, determining that current sharing control is needed when the difference is within a preset difference threshold range.

[0065] In a preferred embodiment, the current sharing control unit 3 includes a judgment module for determining whether current sharing control is needed based on the difference in current between the two cable lines. The judgment module includes:

[0066] The calculation submodule is used to calculate the current imbalance of the power transmission cable line based on the difference in current between the two cable lines.

[0067] The determination submodule is used to determine whether current sharing control is required when the current imbalance meets a preset threshold range.

[0068] In practical implementation, this preset threshold range can be set to [η]. min ,η max ], where η min η is the minimum permissible current imbalance for a power transmission cable line. max This represents the maximum current imbalance that may occur in a power transmission cable line.

[0069] In this embodiment of the invention, the determination of whether current sharing control is required is based on the degree of current imbalance, and the method is simple and convenient.

[0070] In practical implementation, the unbalance calculation formula can be set according to the difference in current between the two cable lines and the actual situation. Preferably, this calculation submodule is specifically used to calculate the current unbalance of the transmission cable lines according to the following formula:

[0071]

[0072] In the formula, η represents the current imbalance of the transmission cable line, ΔI is the difference in current between the two cable lines, and I r This refers to the rated current of a single cable line.

[0073] Impedance unit 2, as a component for realizing the connection impedance of the cable line, can be an impedance device with a control switch. This control switch is turned on and off by the current sharing control unit 3 to achieve intelligent switching of the impedance device. As one implementation method, such as... Figure 2 As shown, the impedance unit 2 includes a capacitor C1, a switching circuit S1, and an impedance coupling coil T1 wound around the corresponding cable line, connected in sequence. Preferably, the switching circuit S1 is a MOSFET switching circuit.

[0074] When the switching circuit S1 is turned on, capacitor C1 is connected across the impedance coupling coil T1. Through the action of the impedance coupling coil T1, capacitor C1 is coupled to the corresponding cable line. The equivalent impedance of capacitor C1 in the cable line is:

[0075]

[0076] In the formula, Z c The ω represents the equivalent impedance of capacitor C1 in the cable line, j represents the imaginary part, C is the capacitance of capacitor C1, k is the number of turns of impedance coupling coil T1, and ω is the power frequency angular frequency.

[0077] As shown in the above formula, the impedance of the cable line can be changed by switching capacitor C1, thereby changing the internal current of the cable. In this embodiment of the invention, the specific structure of the impedance unit 2 and the connection method of each component of the impedance unit 2 are set. The impedance unit 2 is connected to the current sharing control unit 3, which is simple and convenient to install and easy to switch the impedance.

[0078] Based on the impedance unit 2, the current sharing control unit 3 further includes a determining module for determining the number of impedance units 2 to be switched on based on the difference in current. The determining module is specifically used for:

[0079] The number of impedance units 2 to be switched is calculated according to the following formula:

[0080]

[0081] In the formula, n c This indicates the number of impedance units 2 that are switched on or off, and U is the operating voltage of the power transmission cable line.

[0082] Based on the number n of impedance unit 2 c The calculation formula shows that the larger the number of turns of the impedance coupling coil T1, the more switching is required, and the more impedance units 2 are needed for the line. Conversely, the smaller the number of turns, the greater the leakage inductance of the coil and the worse the coupling effect. Considering both the number of impedance units 2 on the line and the coupling effect of the impedance coupling coil T1, the number of turns of the impedance coupling coil T1 can be set to 2 to 3 turns.

[0083] In one feasible implementation, the current sharing control unit 3 further includes a control module for switching a corresponding number of impedance units 2 on cable lines with high current values. Specifically, the control module is used for:

[0084] The corresponding number of switch circuits S1 on the cable line with a higher control current value are in the closed state.

[0085] Furthermore, the current sharing control unit 3 includes a battery module, and the system further includes an energy harvesting unit 4 for supplying power to the current sharing control unit 3, such as... Figure 2 As shown. The energy harvesting unit 4 includes a magnetic core wound with a coil and a power management module. The magnetic core is installed on a single cable line, the output end of the coil is connected to the input end of the power management module, and the output end of the power management module is connected to the battery module. Based on the principle of electromagnetic induction, current flows inside the cable line, generating an alternating magnetic field around the magnetic core. This alternating magnetic field induces a voltage on the coil, which is output through the coil's output end. After rectification and voltage regulation by the power management module, the voltage is finally output to the battery for energy storage.

[0086] In this embodiment of the invention, electrical energy is obtained from the inside of the running cable, eliminating the need for an additional power supply and regular battery replacement, thus enabling maintenance-free operation of the system.

[0087] Based on the current-sharing system for double-unit operation of power transmission cable lines described in the above embodiments, the present invention also provides a current-sharing method for double-unit operation of power transmission cable lines. This current-sharing method can be executed by the current-sharing control unit 3 in the system.

[0088] Please see Figure 3 , Figure 3 The flowchart illustrates a current-sharing method for dual-operation of power transmission cable lines provided by an embodiment of the present invention.

[0089] The flow sharing method provided in this embodiment of the invention includes steps S1-S3.

[0090] Step S1: Receive current data collected by current acquisition unit 1 during the operation of the power transmission cable line. The current data includes the current of each cable line.

[0091] Step S2: Determine whether current sharing control is required based on the difference in current between the two cable lines. If so, determine the number of impedance units 2 to be switched based on the difference in current.

[0092] In one feasible approach, determining whether current sharing control is needed based on the difference in current between the two cable lines includes:

[0093] The current imbalance of the power transmission cable line is calculated based on the difference in current between the two cable lines.

[0094] When the current imbalance meets the preset threshold range, it is determined that current sharing control is required.

[0095] In one feasible manner, calculating the current imbalance of the transmission cable line based on the difference in current between the two cable lines includes:

[0096] The current imbalance of the power transmission cable line is calculated using the following formula:

[0097]

[0098] In the formula, η represents the current imbalance of the transmission cable line, ΔI is the difference in current between the two cable lines, and I r This refers to the rated current of a single cable line.

[0099] In one feasible implementation, the impedance unit 2 includes a capacitor C1, a switching circuit S1, and an impedance coupling coil T1 wound around the corresponding cable line, connected in sequence. Determining the number of impedance units 2 switched on / off based on the current difference includes:

[0100] The number of impedance units 2 to be switched is calculated according to the following formula:

[0101]

[0102] In the formula, n c The number of switching elements in impedance unit 2 is indicated by k, the number of turns in impedance coupling coil T1 is indicated by ω, the power frequency angular frequency is indicated by C, the capacitance of capacitor C1 is indicated by U, and the operating voltage of the power transmission cable line is indicated by U.

[0103] Step S3: Based on the number of impedance units 2 switched, switch the corresponding number of impedance units 2 on the cable line with higher current value.

[0104] In one feasible manner, switching on a corresponding number of impedance units 2 on a cable line with a high current value includes:

[0105] The corresponding number of switch circuits S1 on the cable line with a higher control current value are in the closed state.

[0106] The present invention also provides a current sharing device for double-unit operation of power transmission cable lines, comprising:

[0107] A memory for storing instructions; wherein the instructions are instructions that can implement the current sharing method for double-unit operation of power transmission cable lines as described in any of the above embodiments;

[0108] A processor for executing instructions in the memory.

[0109] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the current sharing method for dual-operation of power transmission cable lines as described in any of the above embodiments.

[0110] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process and effects of the methods described above can be referred to the corresponding processes and effects in the aforementioned system embodiments, and will not be repeated here.

[0111] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, apparatuses, or units, and may be electrical, mechanical, or other forms.

[0112] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0113] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0114] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0115] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A current-sharing method for dual-operation of power transmission cable lines, wherein the power transmission cable lines comprise two cable lines operating in parallel, characterized in that, Each cable line has multiple unswitched impedance units installed, and the method includes: The receiver receives current data collected by the current acquisition unit during the operation of the power transmission cable line, and the current data includes the current of each cable line. Determine whether current sharing control is needed based on the difference in current between the two cable lines. If so, determine the number of impedance units to be switched based on the difference in current. Based on the number of impedance units switched, a corresponding number of impedance units on the cable line with a higher current value are switched. The impedance unit includes a capacitor, a switching circuit, and an impedance coupling coil wound around the corresponding cable line, connected in sequence. Determining the number of impedance units to be switched based on the current difference includes: The number of impedance elements to be switched is calculated using the following formula: In the formula, This indicates the number of impedance units switched on or off. The number of turns of the impedance-coupled coil. It is the power frequency angular frequency. The capacitance is the capacitance of the capacitor. This refers to the operating voltage of the power transmission cable line; The step of determining whether current sharing control is needed based on the difference in current between the two cable lines includes: The current imbalance of the power transmission cable line is calculated based on the difference in current between the two cable lines. When the current imbalance meets the preset threshold range, it is determined that current sharing control is required. The calculation of the current imbalance of the transmission cable line based on the difference in current between the two cable lines includes: The current imbalance of the power transmission cable line is calculated using the following formula: In the formula, This indicates the degree of current imbalance in power transmission cable lines. This represents the difference in current between the two cable lines. This refers to the rated current of a single cable line.

2. The current sharing method for double-unit operation of power transmission cable lines according to claim 1, characterized in that, The switching of a corresponding number of impedance units on a cable line with a high current value includes: The corresponding number of switching circuits on the cable line with a high control current value are in the closed state.

3. A current-sharing device for double-unit operation of power transmission cable lines, characterized in that, include: A memory for storing instructions; wherein the instructions are instructions capable of implementing the current sharing method for double-unit operation of power transmission cable lines as described in any one of claims 1-2; A processor for executing instructions in the memory.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the current sharing method for dual-operation of power transmission cable lines as described in any one of claims 1-2.

5. A current-sharing system for dual-operation of power transmission cable lines, wherein the power transmission cable lines comprise two cable lines operating in parallel, characterized in that, The system includes: A current acquisition unit is used to acquire current data collected during the operation of the power transmission cable, including the current of each cable line. Impedance units, with multiple unswitched impedance units installed on each cable line; The current sharing control unit is used to receive the current data, determine whether current sharing control is needed based on the difference in current between the two cable lines, and if so, determine the number of impedance units to be switched based on the difference in current; and switch the corresponding number of impedance units on the cable line with the higher current value based on the number of impedance units to be switched. The impedance unit includes a capacitor, a switching circuit, and an impedance coupling coil wound on the corresponding cable line, connected in sequence. The current sharing control unit further includes a determining module for determining the number of impedance units to be switched on based on the difference in current. The determining module is specifically used for: The number of impedance elements to be switched is calculated using the following formula: In the formula, This indicates the number of impedance units switched on or off. The number of turns of the impedance-coupled coil. It is the power frequency angular frequency. The capacitance is the capacitance of the capacitor. This refers to the operating voltage of the power transmission cable line; The current sharing control unit includes a judgment module for determining whether current sharing control is needed based on the difference in current between the two cable lines. The judgment module includes: The calculation submodule is used to calculate the current imbalance of the power transmission cable line based on the difference in current between the two cable lines. The determination submodule is used to determine whether current sharing control is required when the current imbalance meets the preset threshold range. The calculation submodule is specifically used for: The current imbalance of the power transmission cable line is calculated using the following formula: In the formula, This indicates the degree of current imbalance in power transmission cable lines. This represents the difference in current between the two cable lines. This refers to the rated current of a single cable line.

6. The current sharing system for double-unit operation of power transmission cable lines according to claim 5, characterized in that, The current sharing control unit further includes a control module for switching a corresponding number of impedance units on cable lines with high current values. Specifically, the control module is used for: The corresponding number of switching circuits on the cable line with a high control current value are in the closed state.

7. The current sharing system for double-unit operation of power transmission cable lines according to any one of claims 5-6, characterized in that, The current acquisition unit includes: A current sensor used to collect the current in a single cable line.

8. The current sharing system for double-unit operation of power transmission cable lines according to any one of claims 5-6, characterized in that, The current sharing control unit includes a battery module, and the system further includes: The power harvesting unit includes a magnetic core with a coil wound around it and a power management module; the magnetic core is installed on a single cable line, the output end of the coil is connected to the input end of the power management module, and the output end of the power management module is connected to the battery module.

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