Method and device for calculating current-carrying unbalance degree of cable and computer equipment

Abstract

The invention relates to a cable current-carrying unbalance degree calculation method and device and computer equipment. The method comprises the following steps: acquiring electrical parameters, laying environment data and cable structure data of parallel cables in the same direction, and constructing an environment impedance matrix of the parallel cables in the same direction; constructing an environment cable section model of the same-direction parallel cable based on the data, and identifying each associated parameter of the same-direction parallel cable; constructing a full-line equivalent circuit model of the same-direction parallel cables based on the correlation parameters; and on the basis of the full-line equivalent circuit model, identifying current-carrying distribution information of the same-direction parallel cables, and on the basis of the current-carrying distribution information, calculating the current-carrying unbalance degree of the same-direction parallel cables. By adopting the method, the safety and the operation efficiency of the power system can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of power cables, and in particular to a method, device and computer equipment for calculating cable current imbalance. Background Art

[0002] In modern power systems, cable parallel connection is a common means of increasing capacity. By running multiple cables in parallel, the power transmission capacity can be effectively improved. However, due to differences in cable length, impedance, contact resistance and other factors, the current carrying capacity of the same-phase parallel cables often suffers from current imbalance in actual operation. This imbalance can cause some cables to be overloaded, which accelerates aging and even causes failures. At the same time, other cables are not fully utilized, reducing the overall efficiency of the system.

[0003] In the prior art, the main methods for solving current imbalance include impedance matching, current monitoring and numerical simulation. The impedance matching method reduces the current imbalance by accurately measuring and matching the resistance, inductance and other parameters of each cable, but this method requires high-precision measurement equipment and complex calculation processes, and the cable impedance may change due to environmental changes and aging, affecting the matching effect, so that this method requires high-precision measurement and complex calculation processes, and it is difficult to cope with the dynamic changes of cable parameters. Therefore, there is an urgent need for a simpler and more efficient method to calculate and optimize the current imbalance of in-phase parallel cables, so as to improve the safety and operation efficiency of the power system. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for calculating cable current imbalance in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a method for calculating the current imbalance of a cable. The method comprises:

[0006] Acquire various electrical parameters of the unidirectional parallel cables, laying environment data of the unidirectional parallel cables, and cable structure data of the unidirectional parallel cables, and construct an environmental impedance matrix of the unidirectional parallel cables based on the electrical parameters;

[0007] Based on the laying environment data and the co-directional parallel cable structure data, an environmental cable cross-section model of the co-directional parallel cable is constructed, and based on the environmental cable cross-section model and the environmental impedance matrix, various associated parameters of the co-directional parallel cable are identified;

[0008] Based on the associated parameters, construct an equivalent circuit model of the entire line of the parallel cables in the same direction;

[0009] Based on the full-line equivalent circuit model, the current distribution information of the parallel cables in the same direction is identified, and based on the current distribution information, the current imbalance of the parallel cables in the same direction is calculated.

[0010] Optionally, constructing the environmental impedance matrix of the co-directional parallel cables based on the electrical parameters includes:

[0011] Based on the electrical parameters, the impedance value of each impedance type is identified, and based on the impedance value of each impedance type, an initial impedance matrix of the co-directional parallel cables is constructed; the impedance types include environmental impedance types and non-environmental impedance types;

[0012] Based on the impedance value of the environmental impedance type, the initial impedance matrix is ​​subjected to matrix transformation processing to obtain the impedance matrix of the co-directional parallel cables, and the impedance matrix is ​​used as the environmental impedance matrix of the co-directional parallel cables.

[0013] Optionally, constructing an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the co-directional parallel cable structure data includes:

[0014] Based on the co-directional parallel cable structure data, identifying the structure parameters of each structure component of the co-directional parallel cable, and based on the laying environment data, identifying the medium structure parameters of different environmental media;

[0015] Based on the structural parameters of each structural component of the parallel cables in the same direction, a sub-cable cross-section model of the parallel cables in the same direction is constructed through a modeling program, and based on the medium structural parameters of each of the environmental media, an environmental cross-section model of the parallel cables in the same direction is constructed through the modeling program;

[0016] The relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables are obtained, and based on the relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables, the sub-cable cross-section model and the environmental cross-section model are spliced ​​to obtain the environmental cable cross-section model of the unidirectional parallel cables.

[0017] Optionally, the identifying the associated parameters of the co-directional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix includes:

[0018] Based on the environmental cable cross-section model and the environmental impedance matrix, the current transmission process of the parallel cables in the same direction is simulated through a unit current response strategy to obtain simulated detection information of the parallel cables in the same direction;

[0019] Based on the simulation detection information, the relevant magnetic flux corresponding to each cable in the parallel cables in the same direction is calculated, and based on the relevant magnetic flux corresponding to each of the cables, the total impedance matrix of the parallel cables in the same direction is calculated through an algorithm optimization strategy;

[0020] The total impedance matrix is ​​used as the bulk electromagnetic parameter of the co-directional parallel cable, and actual component information of each cable-related component of the co-directional parallel cable is obtained;

[0021] Based on the actual component information of each cable-related component, an associated component model of each cable-related component is constructed, and the component parameters corresponding to each associated component model and the main electromagnetic parameters are used as the associated parameters of the same-direction parallel cables.

[0022] Optionally, the total impedance matrix of the cables connected in parallel in the same direction is calculated by an algorithm optimization strategy based on the relevant magnetic flux corresponding to each of the cables, including:

[0023] For each cable, based on the relevant magnetic flux corresponding to the cable, the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors are identified, and based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, the self-induction impedance matrix of the cable and the mutual induction impedance matrix between the cable and other cables are calculated;

[0024] Based on the self-inductive impedance and each of the mutual inductive impedances, the self-impedance matrix of the cable is calculated, and impedance superposition processing is performed on the sub-impedance matrices of all cables to obtain the total impedance matrix of the co-directional parallel cables.

[0025] Optionally, constructing a full-line equivalent circuit model of the co-directional parallel cables based on the associated parameters includes:

[0026] The electrical connection relationship between each of the cable-related components and the unidirectional parallel cables is obtained, and based on the electrical connection relationship, the component parameters of each of the cable-related components and the main electromagnetic parameters of the unidirectional parallel cables are processed in series to obtain a full-line equivalent circuit model of the unidirectional parallel cables.

[0027] Optionally, the identifying the current distribution information of the parallel cables in the same direction based on the full line equivalent circuit model, and calculating the current imbalance of the parallel cables in the same direction based on the current distribution information, includes:

[0028] Acquire the current value of each cable in the same-direction parallel cables, and based on the current value of each cable, identify the actual current distribution information of each cable through the full-line equivalent circuit model;

[0029] Based on the actual current distribution information of each cable, the sub-current unbalance of each cable is calculated respectively by a current unbalance algorithm, and the sub-current unbalance of all cables is used as the current unbalance of the parallel cables in the same direction.

[0030] In a second aspect, the present application also provides a device for calculating the cable current imbalance. The device comprises:

[0031] An acquisition module, used to acquire electrical parameters of the unidirectional parallel cables, laying environment data of the unidirectional parallel cables, and cable structure data of the unidirectional parallel cables, and construct an environmental impedance matrix of the unidirectional parallel cables based on the electrical parameters;

[0032] An identification module, configured to construct an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the structural data of the co-directional parallel cables, and to identify various associated parameters of the co-directional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix;

[0033] A construction module, used to construct an equivalent circuit model of the entire line of the parallel cables in the same direction based on the associated parameters;

[0034] A calculation module is used to identify the current distribution information of the parallel cables in the same direction based on the full-line equivalent circuit model, and calculate the current imbalance of the parallel cables in the same direction based on the current distribution information.

[0035] Optionally, the acquisition module is specifically used to:

[0036] Based on the electrical parameters, the impedance value of each impedance type is identified, and based on the impedance value of each impedance type, an initial impedance matrix of the co-directional parallel cables is constructed; the impedance types include environmental impedance types and non-environmental impedance types;

[0037] Based on the impedance value of the environmental impedance type, the initial impedance matrix is ​​subjected to matrix transformation processing to obtain the impedance matrix of the co-directional parallel cables, and the impedance matrix is ​​used as the environmental impedance matrix of the co-directional parallel cables.

[0038] Optionally, the identification module is specifically used to:

[0039] Based on the co-directional parallel cable structure data, identifying the structure parameters of each structure component of the co-directional parallel cable, and based on the laying environment data, identifying the medium structure parameters of different environmental media;

[0040] Based on the structural parameters of each structural component of the parallel cables in the same direction, a sub-cable cross-section model of the parallel cables in the same direction is constructed through a modeling program, and based on the medium structural parameters of each of the environmental media, an environmental cross-section model of the parallel cables in the same direction is constructed through the modeling program;

[0041] The relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables are obtained, and based on the relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables, the sub-cable cross-section model and the environmental cross-section model are spliced ​​to obtain the environmental cable cross-section model of the unidirectional parallel cables.

[0042] Optionally, the identification module is specifically used to:

[0043] Based on the environmental cable cross-section model and the environmental impedance matrix, the current transmission process of the parallel cables in the same direction is simulated through a unit current response strategy to obtain simulated detection information of the parallel cables in the same direction;

[0044] Based on the simulation detection information, the relevant magnetic flux corresponding to each cable in the parallel cables in the same direction is calculated, and based on the relevant magnetic flux corresponding to each of the cables, the total impedance matrix of the parallel cables in the same direction is calculated through an algorithm optimization strategy;

[0045] The total impedance matrix is ​​used as the bulk electromagnetic parameter of the co-directional parallel cable, and actual component information of each cable-related component of the co-directional parallel cable is obtained;

[0046] Based on the actual component information of each cable-related component, an associated component model of each cable-related component is constructed, and the component parameters corresponding to each associated component model and the main electromagnetic parameters are used as the associated parameters of the same-direction parallel cables.

[0047] Optionally, the identification module is specifically used to:

[0048] For each cable, based on the relevant magnetic flux corresponding to the cable, the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors are identified, and based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, the self-induction impedance matrix of the cable and the mutual induction impedance matrix between the cable and other cables are calculated;

[0049] Based on the self-inductive impedance and each of the mutual inductive impedances, the self-impedance matrix of the cable is calculated, and impedance superposition processing is performed on the sub-impedance matrices of all cables to obtain the total impedance matrix of the co-directional parallel cables.

[0050] Optionally, the building module is specifically used to:

[0051] The electrical connection relationship between each of the cable-related components and the unidirectional parallel cables is obtained, and based on the electrical connection relationship, the component parameters of each of the cable-related components and the main electromagnetic parameters of the unidirectional parallel cables are processed in series to obtain a full-line equivalent circuit model of the unidirectional parallel cables.

[0052] Optionally, the computing module is specifically used to:

[0053] Acquire the current value of each cable in the same-direction parallel cables, and based on the current value of each cable, identify the actual current distribution information of each cable through the full-line equivalent circuit model;

[0054] Based on the actual current distribution information of each cable, the sub-current unbalance of each cable is calculated respectively by a current unbalance algorithm, and the sub-current unbalance of all cables is used as the current unbalance of the parallel cables in the same direction.

[0055] In a third aspect, the present application provides a computer device, wherein the computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of any one of the methods in the first aspect are implemented.

[0056] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of any one of the methods in the first aspect are implemented.

[0057] In a fifth aspect, the present application provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of any one of the methods in the first aspect are implemented.

[0058] The above-mentioned cable current unbalance calculation method, device and computer equipment obtain various electrical parameters of the unidirectional parallel cables, the laying environment data of the unidirectional parallel cables, and the cable structure data of the unidirectional parallel cables, and construct the environmental impedance matrix of the unidirectional parallel cables based on the various electrical parameters; construct the environmental cable cross-section model of the unidirectional parallel cables based on the laying environment data and the unidirectional parallel cable structure data, and identify various associated parameters of the unidirectional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix; construct the full-line equivalent circuit model of the unidirectional parallel cables based on the various associated parameters, and identify the current distribution information of the unidirectional parallel cables based on the full-line equivalent circuit model; calculate the current unbalance of the unidirectional parallel cables based on the current distribution information. This solution decomposes the cable transmission line into the power supply side, cable body, cable accessories and load side, and performs equivalent circuit modeling in turn. The parameter acquisition of the cable body is processed through a two-dimensional field model, which greatly reduces the complexity of field calculation and ensures the accuracy of line parameters. Compared with the traditional road model, it has higher accuracy and higher calculation efficiency than the traditional numerical simulation calculation model. This solution reduces the complexity of the finite element model, reduces the calculation complexity, and improves the calculation efficiency; combined with the field-road coupling idea, the final calculation is converted to the road model calculation, which can significantly shorten the calculation time while ensuring the calculation accuracy; and this solution has no additional hardware requirements, does not require additional hardware equipment, reduces the installation and maintenance costs of the system, and provides strong technical support for the safe and stable operation of the power system, thereby improving the safety and operation efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 1 is a flow chart of a method for calculating cable current unbalance in one embodiment;

[0060] Figure 2 A schematic diagram of a flow chart of an example of calculating cable current unbalance in one embodiment;

[0061] Figure 3 is a structural block diagram of a device for calculating cable current unbalance in one embodiment;

[0062] Figure 4 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0064] The method for calculating the current unbalance of the cable provided in the embodiment of the present application can be applied to the application environment of the current unbalance calculation of the same-phase parallel cable. The method can be applied to the terminal, the server, and the system including the terminal and the server, and is realized through the interaction between the terminal and the server. Among them, the terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, etc. Among them, the terminal decomposes the cable transmission line into the power side, the cable body, the cable accessories and the load side in turn to perform equivalent circuit modeling, and the parameter acquisition of the cable body part is processed by the two-dimensional field model, which greatly reduces the complexity of the field calculation, and at the same time ensures the accuracy of the line parameters, and has higher accuracy than the traditional road model, and has higher calculation efficiency than the traditional numerical simulation calculation model. This scheme reduces the complexity of the finite element model, reduces the calculation complexity, and improves the calculation efficiency; combined with the field-road coupling idea, the final calculation is converted to the road model calculation, which can significantly shorten the calculation time while ensuring the calculation accuracy; and this scheme has no additional hardware requirements, does not require additional hardware equipment, reduces the installation and maintenance costs of the system, and provides strong technical support for the safe and stable operation of the power system, thereby improving the safety and operation efficiency of the power system.

[0065] In one embodiment, Figure 1 As shown, a method for calculating the cable current unbalance is provided, and the method is applied to a terminal as an example for explanation, including the following steps:

[0066] Step S101, acquiring electrical parameters of the same-direction parallel cables, laying environment data of the same-direction parallel cables, and cable structure data of the same-direction parallel cables, and constructing an environmental impedance matrix of the same-direction parallel cables based on the electrical parameters.

[0067] In this embodiment, the terminal responds to the user's cable data upload operation and obtains the electrical parameters of the parallel cables in the same direction measured by the user, wherein the electrical parameters include the self-impedance Z of the parallel cables in the same direction. ii , the mutual impedance Z affected by other conductors (including other cores, metal shielding structures) ij and environmental influences (the mutual inductance between the environment and the conductors affects Z sj , Z is , the earth's own impedance Z within the return range ss ), generally represented by the impedance matrix parameter Z.

[0068]

[0069] In the formula, Z phase The impedance matrix between the 12×12 conductors, Z phase-earth and Zearth-phase The mutual impedance matrix between the environment and the conductor for 12×1 and 1×12, Z earth Is the environmental self-impedance. Then, the terminal constructs the environmental impedance matrix of the unidirectional parallel cables based on various electrical parameters. The specific process of constructing the environmental impedance matrix will be described in detail later. Then, the terminal obtains the laying environment data of the unidirectional parallel cables and the cable structure data of the unidirectional parallel cables. Among them, the laying environment data includes but is not limited to the environmental data corresponding to the laying environment of the three-layer medium of tunnel-soil-air, and the cable structure data includes but is not limited to the conductor-conductor shield-insulating layer-insulating shield-buffer layer-metal shielding layer-outer sheath layered cable body structure data, and also includes the material data of each body structure, etc.

[0070] Step S102, constructing an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the co-directional parallel cable structure data, and identifying various associated parameters of the co-directional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix.

[0071] In this embodiment, the terminal constructs an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the co-directional parallel cable structure data, and identifies the associated parameters of the co-directional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix. Figure 2 As shown, it is a schematic diagram of the visualized model cross section of the constructed environmental cable cross section model, which includes the positional relationship of each cable of the parallel cables in the same direction, the cross section model of each cable, and the environmental cross section model of the environment in which the parallel cables in the same direction are located. The specific construction process will be described in detail later. Then, the terminal identifies the associated parameters of the parallel cables in the same direction based on the environmental cable cross section model and the environmental impedance matrix. The associated parameters include the electromagnetic parameters of the cable body of the parallel cables in the same direction, the power parameters corresponding to the power model, the load parameters corresponding to the load model, and the accessory parameters corresponding to the accessory information of the cable. The specific identification process will be described in detail later.

[0072] Step S103, constructing a full-line equivalent circuit model of the same-direction parallel cables based on the associated parameters.

[0073] In this embodiment, the terminal constructs a full line equivalent circuit model of the same-direction parallel cables based on the associated parameters. The full line equivalent circuit model is a line current calculation model of the same-phase parallel cables obtained by connecting the cable body parameters, power supply parameters, load parameters and accessory parameters in series according to the electrical connection relationship, such as Figure 3 As shown in FIG. 1 , the equivalent circuit model of the entire line is shown, and the model includes the circuit connection relationship between the cable-related accessories and the cable conductor corresponding to each associated parameter. The specific construction process will be described in detail later.

[0074] Step S104: identifying the current distribution information of the parallel cables in the same direction based on the full line equivalent circuit model, and calculating the current imbalance of the parallel cables in the same direction based on the current distribution information.

[0075] In this embodiment, the terminal identifies the current distribution information of the parallel cables in the same direction based on the full line equivalent circuit model, and calculates the current imbalance of the parallel cables in the same direction based on the current distribution information. The specific calculation process will be described in detail later.

[0076] Based on the above scheme, the cable transmission line is decomposed into the power supply side, cable body, cable accessories and load side, and equivalent circuit modeling is performed in turn. The parameter acquisition of the cable body is processed through a two-dimensional field model, which greatly reduces the complexity of field calculation and ensures the accuracy of line parameters. Compared with the traditional road model, it has higher accuracy and higher calculation efficiency than the traditional numerical simulation calculation model. This scheme reduces the complexity of the finite element model, reduces the calculation complexity, and improves the calculation efficiency; combined with the field-road coupling idea, the final calculation is converted to the road model calculation, which can significantly shorten the calculation time while ensuring the calculation accuracy; and this scheme has no additional hardware requirements, does not require additional hardware equipment, reduces the installation and maintenance costs of the system, and provides strong technical support for the safe and stable operation of the power system, thereby improving the safety and operation efficiency of the power system.

[0077] Optionally, based on various electrical parameters, an environmental impedance matrix of the co-directional parallel cables is constructed, including: based on various electrical parameters, identifying the impedance value of each impedance type, and constructing an initial impedance matrix of the co-directional parallel cables based on the impedance value of each impedance type; the impedance types include environmental impedance types and non-environmental impedance types; based on the impedance values ​​of the environmental impedance types, the initial impedance matrix is ​​subjected to matrix transformation processing to obtain the impedance matrix of the co-directional parallel cables, and the impedance matrix is ​​used as the environmental impedance matrix of the co-directional parallel cables.

[0078] In this embodiment, the terminal identifies the impedance value of each impedance type based on each electrical parameter, and constructs the initial impedance matrix of the co-directional parallel cable based on the impedance value of each impedance type. The impedance type includes an environmental impedance type and a non-environmental impedance type. Specifically, the environmental impedance type includes an environmental self-impedance type and a mutual impedance type between the environment and the conductor; the non-environmental impedance type includes the mutual impedance affected by other conductors of the cable (including other cores and metal shielding structures) and the self-impedance of the co-directional parallel cable.

[0079] The terminal performs matrix transformation processing on the initial impedance matrix based on the impedance value of the environmental impedance type to obtain the impedance matrix of the co-directional parallel cables, and uses the impedance matrix as the environmental impedance matrix of the co-directional parallel cables.

[0080] Specifically, the terminal uses the matrix transformation idea to decouple the environmental impact and obtain a new 12×12 impedance matrix Z'. The conversion formula is as follows:

[0081]

[0082] In the above formula, Z phase The impedance matrix between the 12×12 conductors, Z phase-earth and Z earth-phase The mutual impedance matrix between the environment and the conductor for 12×1 and 1×12, Z earth is the environmental self-impedance

[0083] Based on the above scheme, the environmental influence is decoupled through matrix transformation processing, so that the obtained environmental impedance matrix is ​​a mathematical model of the electromagnetic induction of the cable body that eliminates the influence of the laying environment, thereby improving the accuracy of identifying the impedance information of the same-direction parallel cable body.

[0084] Optionally, based on the laying environment data and the structural data of the same-direction parallel cables, an environmental cable cross-section model of the same-direction parallel cables is constructed, including: based on the structural data of the same-direction parallel cables, identifying the structural parameters of each structural component of the same-direction parallel cables, and based on the laying environment data, identifying the medium structural parameters of different environmental media; based on the structural parameters of each structural component of the same-direction parallel cables, constructing a sub-cable cross-section model of the same-direction parallel cables through a modeling program, and based on the medium structural parameters of each environmental medium, constructing an environmental cross-section model of the same-direction parallel cables through a modeling program; obtaining the relative position relationship between the laying environment and the same-direction parallel cables, as well as the relative position relationship between each same-direction parallel cable, and based on the relative position relationship between the laying environment and the same-direction parallel cables, as well as the relative position relationship between each same-direction parallel cable, splicing the sub-cable cross-section model with the environmental cross-section model to obtain the cable cross-section model of the same-direction parallel cables.

[0085] In this embodiment, the terminal identifies the structural parameters of each structural component of the unidirectional parallel cable based on the structural data of the unidirectional parallel cable, and identifies the dielectric structural parameters of different environmental media based on the laying environment data. The different environmental media include the environmental medium of the three-layer medium of tunnel-soil-air. Then, the terminal constructs the sub-cable cross-section model of the unidirectional parallel cable through a modeling program based on the structural parameters of each structural component of the unidirectional parallel cable, and constructs the environmental cross-section model of the unidirectional parallel cable through a modeling program based on the dielectric structural parameters of each environmental medium. Each cross-section model constructed is a finite element model of the coupled electromagnetic field and circuit module constructed by the terminal based on the finite element simulation program.

[0086] Then, the terminal obtains the relative position relationship between the laying environment and the parallel cables in the same direction, as well as the relative position relationship between each parallel cable in the same direction, and based on the relative position relationship between the laying environment and the parallel cables in the same direction, as well as the relative position relationship between each parallel cable in the same direction, splices the sub-cable cross-section model with the environmental cross-section model to obtain the environmental cable cross-section model of the parallel cables in the same direction.

[0087] Based on the above scheme, the cable cross-section model of the co-directional parallel cables is constructed by laying the environment data and the co-directional parallel cable structure data, thereby improving the accuracy of the constructed model.

[0088] Optionally, based on the environmental cable cross-section model and the environmental impedance matrix, the associated parameters of the unidirectional parallel cables are identified, including: based on the environmental cable cross-section model and the environmental impedance matrix, the current transmission process of the unidirectional parallel cables is simulated through a unit current response strategy to obtain simulation detection information of the unidirectional parallel cables; based on the simulation detection information, the relevant magnetic flux corresponding to each cable in the unidirectional parallel cables is calculated, and based on the relevant magnetic flux corresponding to each cable, the total impedance matrix of the unidirectional parallel cables is calculated through an algorithm optimization strategy; the total impedance matrix is ​​used as the main electromagnetic parameters of the unidirectional parallel cables, and the actual component information of each cable-associated component of the unidirectional parallel cables is obtained; based on the actual component information of each cable-associated component, an associated component model of each cable-associated component is constructed, and the component parameters corresponding to each associated component model and the main electromagnetic parameters are used as the associated parameters of the unidirectional parallel cables.

[0089] In this embodiment, the terminal simulates the current transmission process of the parallel cables in the same direction through the unit current response strategy based on the environmental cable cross-section model and the environmental impedance matrix, and obtains the simulation detection information of the parallel cables in the same direction. Among them, the unit current response strategy is to apply a unit current to one of the cables in the parallel cables in the same direction, so as to identify the magnetic flux information of other parallel cables. Then, based on the simulated detection information, the terminal calculates the relevant magnetic flux corresponding to each cable in the parallel cables in the same direction, and calculates the total impedance matrix of the parallel cables in the same direction through the algorithm optimization strategy based on the relevant magnetic flux corresponding to each cable. Among them, the relevant magnetic flux includes the magnetic flux generated by the cable conductor and the magnetic flux of the cable conductor and other cable conductors. The specific process of calculating the total impedance matrix will be described in detail later. Then, the terminal uses the total impedance matrix as the main electromagnetic parameter of the parallel cables in the same direction, and obtains the actual component information of each cable-related component of the parallel cables in the same direction. The actual component information includes power supply information, cable-related accessory information, and cable power flow information. After that, the terminal constructs the associated component model of each cable-related component based on the actual component information of each cable-related component.

[0090] Specifically, the terminal obtains power supply information, cable-related accessory information, and cable power flow information, and then sets a non-ideal power supply model. The power supply model can be set to a model of an ideal voltage source series impedance, and the phase angle and amplitude of the three-phase power supply can be adjusted according to actual conditions. The terminal sets a load model for power flow control. The load model adopts a constant power model. Assuming that the power flow at the load is S, where the power factor is cosφ, then its equivalent load impedance (R L +jX L ) is calculated as follows:

[0091]

[0092]

[0093] The terminal constructs the equivalent circuit model of the cable accessories. The cable accessories mainly include the intermediate joint and the terminal. For the intermediate joint, the contact coefficient k is introduced to describe its contact resistance R s1 Size, the corresponding formula is as follows:

[0094] R S1 =kR

[0095] In the above formula, R represents the unit resistance of the body. For the terminal, the metal shielding layer is generally grounded. The two metal shields of the same phase are generally connected in parallel through the connection terminal and then grounded. The grounding resistance is set to R s2 , its range is generally less than 4Ω.

[0096] Finally, the terminal uses the component parameters corresponding to each associated component model and the main electromagnetic parameters as the associated parameters of the same-direction parallel cable.

[0097] Based on the above scheme, the electrical line parameters of the cable body, cable accessories, power supply side and load side are solved respectively by constructing the environmental cable cross-section model and the environmental impedance matrix, which improves the accuracy of the calculated parameters.

[0098] Optionally, based on the relevant magnetic flux corresponding to each cable, the total impedance matrix of the parallel cables in the same direction is calculated through an algorithm optimization strategy, including: for each cable, based on the relevant magnetic flux corresponding to the cable, identifying the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, and based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, calculating the self-induction impedance matrix of the cable and the mutual induction impedance matrix between the cable and other cables; based on the self-induction impedance and each mutual induction impedance, calculating the self-impedance matrix of the cable, and performing impedance superposition processing on the sub-impedance matrices of all cables to obtain the total impedance matrix of the parallel cables in the same direction.

[0099] In this embodiment, for each cable, the terminal identifies the magnetic flux generated by the cable conductor and the magnetic flux interlinked by the cable conductor and other cable conductors based on the relevant magnetic flux corresponding to the cable, and calculates the self-inductive impedance matrix of the cable and the mutual inductive impedance matrix between the cable and other cables based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked by the cable conductor and other cable conductors. Then, the terminal calculates the self-impedance matrix of the cable based on the self-inductive impedance and each mutual inductive impedance, and performs impedance superposition processing on the sub-impedance matrices of all cables to obtain the total impedance matrix of the same-direction parallel cables.

[0100] Specifically, based on the environmental cable cross-section model and the environmental impedance matrix, it can be obtained that the cable body satisfies the following volt-ampere characteristic equation:

[0101] U Phase = Z′I Phase

[0102] In the above formula, U P is a 12×1 phase voltage matrix, which represents the voltage at both ends of each sub-cable core and the voltage at both ends of the metal shielding layer. Similarly, I P It is also a 12×1 phase current matrix, which represents the current of each sub-cable core and the metal shielding layer current, and Z' is the environmental impedance matrix.

[0103] Then, the terminal uses the unit current response method to apply a unit current source to each conductor one by one, and solves the magnetic flux response Φ of each conductor at a 50Hz power frequency. P , calculate the mutual inductance matrix (i.e.) as follows:

[0104] Z mutual =Φ P I -1

[0105] The self-impedance Z of the parallel cable body obtained in step S101 is self , then the total impedance matrix of the cable body is:

[0106] Z′=Z mutual +Z self

[0107] Based on the above scheme, by combining the unit current response strategy and the environmental impedance matrix, the total impedance matrix of the cable body is analyzed to avoid and improve the efficiency and accuracy of the analysis.

[0108] Optionally, based on each associated parameter, a full-line equivalent circuit model of the same-direction parallel cables is constructed, including: obtaining the electrical connection relationship between each cable-associated component and the same-direction parallel cables, and based on the electrical connection relationship, connecting the component parameters of each cable-associated component and the main electromagnetic parameters of the same-direction parallel cables in series to obtain the full-line equivalent circuit model of the same-direction parallel cables.

[0109] In this embodiment, the terminal obtains the electrical connection relationship between each cable-related component and the parallel cable in the same direction, and based on the electrical connection relationship, the component parameters of each cable-related component and the main electromagnetic parameters of the parallel cable in the same direction are processed in series to obtain the full-line equivalent circuit model of the parallel cable in the same direction. Among them, the electrical connection relationship between each cable-related component and the parallel cable in the same direction includes the electrical connection relationship between the power supply and each cable of the parallel cable in the same direction, the electrical connection relationship between the related accessories of the cable and each cable of the parallel cable in the same direction, and the electrical connection relationship between the load module of the cable and each cable of the parallel cable in the same direction.

[0110] Based on the above scheme, the cable transmission line is decomposed into the power side, cable body, cable accessories and load side, and equivalent circuit modeling is performed in turn. The parameter acquisition of the cable body is processed through a two-dimensional field model, which greatly reduces the complexity of the field calculation and ensures the accuracy of the line parameters. Compared with the traditional road model, it has higher accuracy and higher computational efficiency than the traditional numerical simulation calculation model.

[0111] Optionally, based on the equivalent circuit model of the entire line, the current distribution information of the same-direction parallel cables is identified, and based on the current distribution information, the current imbalance of the same-direction parallel cables is calculated, including: obtaining the current value of each cable in the same-direction parallel cables, and based on the current value of each cable, identifying the actual current distribution information of each cable through the equivalent circuit model of the entire line; based on the actual current distribution information of each cable, calculating the sub-current imbalance of each cable separately through a current imbalance algorithm, and using the sub-current imbalance of all cables as the current imbalance of the same-direction parallel cables.

[0112] In this embodiment, the terminal obtains the current value of each cable in the same-direction parallel cable, and based on the current value of each cable, identifies the actual current distribution information of each cable through the equivalent circuit model of the entire line. The actual current distribution information of the ground cable is the actual current magnitude of each phase cable. The current current value of each cable is the loading current value loaded on the cable of each phase.

[0113] Based on the actual current distribution information of each cable, the terminal calculates the sub-current imbalance of each cable through the current imbalance algorithm, and uses the sub-current imbalance of all cables as the current imbalance of the same-direction parallel cables.

[0114] The calculation formula of the current imbalance algorithm is as follows:

[0115]

[0116]

[0117]

[0118] In the formula, I A1 ,I A2 is the current of each sub-cable of A; I B1 ,I B2 is the current of each sub-cable of phase B; I C1 ,I C2 is the current size of each sub-cable of phase C.

[0119] Based on the above scheme, an algorithm for characterizing the imbalance of current distribution is implemented by calculating the current difference between the two sub-cables compared to the sum of the currents. Compared with the traditional imbalance calculation method, the calculation result of the method of the present invention is more intuitive and clear, and the calculation efficiency is higher while ensuring the calculation accuracy.

[0120] This application also provides an example of calculating the cable current imbalance, such as Figure 2 As shown, the specific processing process includes the following steps:

[0121] Step S201, acquiring various electrical parameters of the same-direction parallel cables, laying environment data of the same-direction parallel cables, and cable structure data of the same-direction parallel cables.

[0122] Step S202, based on each electrical parameter, the impedance value of each impedance type is identified, and based on the impedance value of each impedance type, an initial impedance matrix of the co-directional parallel cables is constructed; the impedance types include environmental impedance type and non-environmental impedance type.

[0123] Step S203, based on the impedance value of the environmental impedance type, the initial impedance matrix is ​​subjected to matrix transformation processing to obtain the impedance matrix of the co-directional parallel cables, and the impedance matrix is ​​used as the environmental impedance matrix of the co-directional parallel cables.

[0124] Step S204, based on the structural data of the parallel cables in the same direction, the structural parameters of the structural components of the parallel cables in the same direction are identified, and based on the laying environment data, the medium structural parameters of the medium in different environments are identified.

[0125] Step S205, based on the structural parameters of each structural component of the co-directional parallel cable, a sub-cable cross-section model of the co-directional parallel cable is constructed through a modeling program, and based on the medium structural parameters of each environmental medium, an environmental cross-section model of the co-directional parallel cable is constructed through a modeling program.

[0126] Step S206, obtaining the relative position relationship between the laying environment and the parallel cables in the same direction, as well as the relative position relationship between each parallel cable in the same direction, and based on the relative position relationship between the laying environment and the parallel cables in the same direction, as well as the relative position relationship between each parallel cable in the same direction, splicing the sub-cable cross-section model with the environmental cross-section model to obtain the environmental cable cross-section model of the parallel cables in the same direction.

[0127] Step S207, based on the environmental cable cross-section model and the environmental impedance matrix, the current transmission process of the parallel cables in the same direction is simulated through a unit current response strategy to obtain simulated detection information of the parallel cables in the same direction.

[0128] Step S208, based on the simulation detection information, calculate the relevant magnetic flux corresponding to each cable in the same-direction parallel cables.

[0129] Step S209, for each cable, based on the corresponding relevant magnetic flux of the cable, identify the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, and based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, calculate the self-inductance impedance matrix of the cable and the mutual inductance impedance matrix between the cable and other cables.

[0130] Step S210, based on the self-inductive impedance and each mutual inductive impedance, the self-impedance matrix of the cable is calculated, and impedance superposition processing is performed on the sub-impedance matrices of all cables to obtain the total impedance matrix of the cables connected in parallel in the same direction.

[0131] Step S211: taking the total impedance matrix as the bulk electromagnetic parameter of the co-directional parallel cable, and obtaining actual component information of each cable-related component of the co-directional parallel cable.

[0132] Step S212, based on the actual component information of each cable-related component, construct an associated component model of each cable-related component, and use the component parameters corresponding to each associated component model and the main electromagnetic parameters as the associated parameters of the same-direction parallel cables.

[0133] Step S213, obtaining the electrical connection relationship between each cable-related component and the same-direction parallel cable, and based on the electrical connection relationship, serially processing the component parameters of each cable-related component and the main electromagnetic parameters of the same-direction parallel cable to obtain the full-line equivalent circuit model of the same-direction parallel cable.

[0134] Step S214, obtaining the current value of each cable in the same-direction parallel cables, and based on the current value of each cable, identifying the actual current distribution information of each cable through the full-line equivalent circuit model.

[0135] Step S215, based on the actual current distribution information of each cable, the sub-current unbalance of each cable is calculated by the current unbalance algorithm, and the sub-current unbalance of all cables is used as the current unbalance of the cables connected in parallel in the same direction.

[0136] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0137] Based on the same inventive concept, the embodiment of the present application also provides a device for calculating the cable current imbalance degree for implementing the method for calculating the cable current imbalance degree involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more device for calculating the cable current imbalance degree provided below can refer to the limitations of the method for calculating the cable current imbalance degree above, and will not be repeated here.

[0138] In one embodiment, Figure 3 As shown, a device for calculating the cable current unbalance is provided, comprising: an acquisition module 310, an identification module 320, a construction module 330 and a calculation module 340, wherein:

[0139] An acquisition module 310 is used to acquire electrical parameters of the parallel cables in the same direction, laying environment data of the parallel cables in the same direction, and cable structure data of the parallel cables in the same direction, and to construct an environmental impedance matrix of the parallel cables in the same direction based on the electrical parameters;

[0140] An identification module 320 is used to construct an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the co-directional parallel cable structure data, and to identify various associated parameters of the co-directional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix;

[0141] A construction module 330 is used to construct an equivalent circuit model of the entire line of the parallel cables in the same direction based on the associated parameters;

[0142] The calculation module 340 is used to identify the current distribution information of the parallel cables in the same direction based on the full line equivalent circuit model, and calculate the current imbalance of the parallel cables in the same direction based on the current distribution information.

[0143] Optionally, the acquisition module 310 is specifically configured to:

[0144] Based on the electrical parameters, the impedance value of each impedance type is identified, and based on the impedance value of each impedance type, an initial impedance matrix of the co-directional parallel cables is constructed; the impedance types include environmental impedance types and non-environmental impedance types;

[0145] Based on the impedance value of the environmental impedance type, the initial impedance matrix is ​​subjected to matrix transformation processing to obtain the impedance matrix of the co-directional parallel cables, and the impedance matrix is ​​used as the environmental impedance matrix of the co-directional parallel cables.

[0146] Optionally, the identification module 320 is specifically configured to:

[0147] Based on the co-directional parallel cable structure data, identifying the structure parameters of each structure component of the co-directional parallel cable, and based on the laying environment data, identifying the medium structure parameters of different environmental media;

[0148] Based on the structural parameters of each structural component of the parallel cables in the same direction, a sub-cable cross-section model of the parallel cables in the same direction is constructed through a modeling program, and based on the medium structural parameters of each of the environmental media, an environmental cross-section model of the parallel cables in the same direction is constructed through the modeling program;

[0149] The relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables are obtained, and based on the relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables, the sub-cable cross-section model and the environmental cross-section model are spliced ​​to obtain the environmental cable cross-section model of the unidirectional parallel cables.

[0150] Optionally, the identification module 320 is specifically configured to:

[0151] Based on the environmental cable cross-section model and the environmental impedance matrix, the current transmission process of the parallel cables in the same direction is simulated through a unit current response strategy to obtain simulated detection information of the parallel cables in the same direction;

[0152] Based on the simulation detection information, the relevant magnetic flux corresponding to each cable in the parallel cables in the same direction is calculated, and based on the relevant magnetic flux corresponding to each of the cables, the total impedance matrix of the parallel cables in the same direction is calculated through an algorithm optimization strategy;

[0153] The total impedance matrix is ​​used as the bulk electromagnetic parameter of the co-directional parallel cable, and actual component information of each cable-related component of the co-directional parallel cable is obtained;

[0154] Based on the actual component information of each cable-related component, an associated component model of each cable-related component is constructed, and the component parameters corresponding to each associated component model and the main electromagnetic parameters are used as the associated parameters of the same-direction parallel cables.

[0155] Optionally, the identification module 320 is specifically configured to:

[0156] For each cable, based on the relevant magnetic flux corresponding to the cable, the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors are identified, and based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, the self-induction impedance matrix of the cable and the mutual induction impedance matrix between the cable and other cables are calculated;

[0157] Based on the self-inductive impedance and each of the mutual inductive impedances, the self-impedance matrix of the cable is calculated, and impedance superposition processing is performed on the sub-impedance matrices of all cables to obtain the total impedance matrix of the co-directional parallel cables.

[0158] Optionally, the construction module 330 is specifically used to:

[0159] The electrical connection relationship between each of the cable-related components and the unidirectional parallel cables is obtained, and based on the electrical connection relationship, the component parameters of each of the cable-related components and the main electromagnetic parameters of the unidirectional parallel cables are processed in series to obtain a full-line equivalent circuit model of the unidirectional parallel cables.

[0160] Optionally, the calculation module 340 is specifically used to:

[0161] Acquire the current value of each cable in the same-direction parallel cables, and based on the current value of each cable, identify the actual current distribution information of each cable through the full-line equivalent circuit model;

[0162] Based on the actual current distribution information of each cable, the sub-current unbalance of each cable is calculated respectively by a current unbalance algorithm, and the sub-current unbalance of all cables is used as the current unbalance of the parallel cables in the same direction.

[0163] Each module in the above-mentioned cable current unbalance calculation device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0164] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for calculating the current imbalance of a cable is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0165] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0166] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps of any one of the methods in the first aspect are implemented.

[0167] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the methods in the first aspect are implemented.

[0168] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of any one of the methods in the first aspect.

[0169] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0170] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0171] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for calculating cable current unbalance, characterized in that: The method comprises: Acquire various electrical parameters of the unidirectional parallel cables, laying environment data of the unidirectional parallel cables, and cable structure data of the unidirectional parallel cables, and construct an environmental impedance matrix of the unidirectional parallel cables based on the electrical parameters; Based on the laying environment data and the co-directional parallel cable structure data, an environmental cable cross-section model of the co-directional parallel cable is constructed, and based on the environmental cable cross-section model and the environmental impedance matrix, various associated parameters of the co-directional parallel cable are identified; Based on the associated parameters, construct an equivalent circuit model of the entire line of the parallel cables in the same direction; Based on the full-line equivalent circuit model, the current distribution information of the parallel cables in the same direction is identified, and based on the current distribution information, the current imbalance of the parallel cables in the same direction is calculated.

2. The method according to claim 1, characterized in that The step of constructing an environmental impedance matrix of the co-directional parallel cables based on the electrical parameters includes: Based on the electrical parameters, the impedance value of each impedance type is identified, and based on the impedance value of each impedance type, an initial impedance matrix of the co-directional parallel cables is constructed; the impedance types include environmental impedance types and non-environmental impedance types; Based on the impedance value of the environmental impedance type, the initial impedance matrix is ​​subjected to matrix transformation processing to obtain the impedance matrix of the co-directional parallel cables, and the impedance matrix is ​​used as the environmental impedance matrix of the co-directional parallel cables.

3. The method according to claim 2, characterized in that The step of constructing an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the co-directional parallel cable structure data includes: Based on the co-directional parallel cable structure data, identifying the structure parameters of each structure component of the co-directional parallel cable, and based on the laying environment data, identifying the medium structure parameters of different environmental media; Based on the structural parameters of each structural component of the parallel cables in the same direction, a sub-cable cross-section model of the parallel cables in the same direction is constructed through a modeling program, and based on the medium structural parameters of each of the environmental media, an environmental cross-section model of the parallel cables in the same direction is constructed through the modeling program; The relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables are obtained, and based on the relative position relationship between the laying environment and the unidirectional parallel cables, as well as the relative position relationship between each of the unidirectional parallel cables, the sub-cable cross-section model and the environmental cross-section model are spliced ​​to obtain the environmental cable cross-section model of the unidirectional parallel cables.

4. The method according to claim 1, characterized in that: The identifying the associated parameters of the parallel cables in the same direction based on the environmental cable cross-section model and the environmental impedance matrix includes: Based on the environmental cable cross-section model and the environmental impedance matrix, the current transmission process of the parallel cables in the same direction is simulated through a unit current response strategy to obtain simulated detection information of the parallel cables in the same direction; Based on the simulation detection information, the relevant magnetic flux corresponding to each cable in the parallel cables in the same direction is calculated, and based on the relevant magnetic flux corresponding to each of the cables, the total impedance matrix of the parallel cables in the same direction is calculated through an algorithm optimization strategy; The total impedance matrix is ​​used as the bulk electromagnetic parameter of the co-directional parallel cable, and actual component information of each cable-related component of the co-directional parallel cable is obtained; Based on the actual component information of each cable-related component, an associated component model of each cable-related component is constructed, and the component parameters corresponding to each associated component model and the main electromagnetic parameters are used as the associated parameters of the same-direction parallel cables.

5. The method according to claim 4, characterized in that The total impedance matrix of the cables connected in parallel in the same direction is calculated based on the relevant magnetic flux corresponding to each of the cables through an algorithm optimization strategy, including: For each cable, based on the relevant magnetic flux corresponding to the cable, the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors are identified, and based on the magnetic flux generated by the cable conductor and the magnetic flux interlinked between the cable conductor and other cable conductors, the self-induction impedance matrix of the cable and the mutual induction impedance matrix between the cable and other cables are calculated; Based on the self-inductive impedance and each of the mutual inductive impedances, the self-impedance matrix of the cable is calculated, and impedance superposition processing is performed on the sub-impedance matrices of all cables to obtain the total impedance matrix of the co-directional parallel cables.

6. The method according to claim 4, characterized in that The step of constructing a full-line equivalent circuit model of the co-directional parallel cables based on the associated parameters includes: The electrical connection relationship between each of the cable-related components and the unidirectional parallel cables is obtained, and based on the electrical connection relationship, the component parameters of each of the cable-related components and the main electromagnetic parameters of the unidirectional parallel cables are processed in series to obtain a full-line equivalent circuit model of the unidirectional parallel cables.

7. The method according to claim 1, characterized in that The identifying the current distribution information of the parallel cables in the same direction based on the full line equivalent circuit model, and calculating the current imbalance of the parallel cables in the same direction based on the current distribution information, comprises: Acquire the current value of each cable in the same-direction parallel cables, and based on the current value of each cable, identify the actual current distribution information of each cable through the full-line equivalent circuit model; Based on the actual current distribution information of each cable, the sub-current unbalance of each cable is calculated respectively by a current unbalance algorithm, and the sub-current unbalance of all cables is used as the current unbalance of the parallel cables in the same direction.

8. A device for calculating cable current unbalance, characterized in that: The device comprises: An acquisition module, used to acquire electrical parameters of the unidirectional parallel cables, laying environment data of the unidirectional parallel cables, and cable structure data of the unidirectional parallel cables, and construct an environmental impedance matrix of the unidirectional parallel cables based on the electrical parameters; An identification module, configured to construct an environmental cable cross-section model of the co-directional parallel cables based on the laying environment data and the structural data of the co-directional parallel cables, and to identify various associated parameters of the co-directional parallel cables based on the environmental cable cross-section model and the environmental impedance matrix; A construction module, used to construct an equivalent circuit model of the entire line of the parallel cables in the same direction based on the associated parameters; A calculation module is used to identify the current distribution information of the parallel cables in the same direction based on the full-line equivalent circuit model, and calculate the current imbalance of the parallel cables in the same direction based on the current distribution information.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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