Phase sequence correction method and device, nonvolatile storage medium and electronic equipment

Abstract

The invention discloses a phase sequence correction method and device, a nonvolatile storage medium and electronic equipment. The method comprises the following steps: acquiring current load data of a target cable under an initial phase sequence condition; based on the current load data, determining cable sheath current corresponding to the target cable under a plurality of preset first candidate phase sequence conditions; determining target probabilities respectively corresponding to a plurality of first candidate phase sequences according to cable sheath currents respectively corresponding to the target cable under the condition of a plurality of preset first candidate phase sequences; determining the phase sequence with the maximum target probability in the plurality of first candidate phase sequences as a target phase sequence; the initial phase sequence of the target cable is corrected into the target phase sequence, and the sheath grounding current of the target cable adopting the target phase sequence is smaller than the sheath grounding current of the target cable adopting the initial phase sequence. The technical problem of overlarge sheath current caused by non-ideal cable phase sequence selection in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular, to a phase sequence correction method, device, non-volatile storage medium and electronic equipment. Background Art

[0002] With the continuous development of the power system, the proportion of cable lines in the power system is getting larger and larger. The cable sheath will be affected by electromagnetic fields of different directions and intensities to generate cable sheath current. As the voltage level of the power system and the transmission capacity of the transmission line increase, the cable sheath current also increases. Excessive cable sheath current will damage the metal sheath, reduce the service life of the cable, and affect the safe operation of the power system. The cable phase sequence has a direct impact on the distribution and size of the cable sheath current, so the cable sheath current can be reduced by optimizing the cable phase sequence. In the related technology, the selection and optimization of the cable phase sequence depends on the experience and intuition of the staff, which is time-consuming and labor-intensive, and is prone to design deviations, making it difficult to accurately optimize the cable phase sequence. There is a problem of excessive sheath current caused by unsatisfactory cable phase sequence selection.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present application provide a phase sequence correction method, device, non-volatile storage medium and electronic device to at least solve the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection existing in the related art.

[0005] According to one aspect of an embodiment of the present application, a phase sequence correction method is provided, including: obtaining current load data of a target cable in an initial phase sequence; determining, based on the current load data, cable sheath currents corresponding to the target cable in a plurality of predetermined first candidate phase sequences; determining target probabilities corresponding to a plurality of first candidate phase sequences according to the cable sheath currents corresponding to the target cable in a plurality of predetermined first candidate phase sequences, wherein the target probability represents the probability that a grounding current of the target cable is less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; determining a phase sequence with the largest target probability among the plurality of first candidate phase sequences as the target phase sequence; and correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable adopting the target phase sequence is less than the sheath grounding current of the target cable adopting the initial phase sequence.

[0006] Optionally, based on the current load data, the cable sheath currents corresponding to the target cable in multiple predetermined first candidate phase sequences are determined, including: based on the current frequency and the earth equivalent loop depth, the inductance parameters corresponding to the target cable in multiple first candidate phase sequences are determined, wherein the earth equivalent loop depth represents the response characteristics of the earth to the current in the target cable at the current frequency; according to the current load data, the inductance parameters corresponding to the multiple first candidate phase sequences, and the configuration of the target cable, the cable sheath currents corresponding to the multiple first candidate phase sequences are obtained.

[0007] Optionally, the inductance parameters include cable self-inductance and cable mutual inductance, and according to current load data, the inductance parameters corresponding to multiple first candidate phase sequences, and the configuration mode of the target cable, the cable sheath currents corresponding to multiple first candidate phase sequences are obtained, including: based on the cable self-inductance corresponding to multiple first candidate phase sequences, obtaining the cable sheath impedances corresponding to multiple first candidate phase sequences; based on the cable mutual inductance corresponding to the first candidate phase sequences, and the current load data, determining the core induced electromotive force corresponding to multiple first candidate phase sequences; determining the cable sheath currents corresponding to multiple first candidate phase sequences according to the configuration mode, as well as the cable sheath impedances and the core induced electromotive force corresponding to multiple first candidate phase sequences.

[0008] Optionally, the cable sheath current includes single-phase sheath currents corresponding to the three-phase electricity included in the target cable, and the target probabilities corresponding to the multiple first candidate phase sequences are determined according to the cable sheath currents corresponding to the target cable in multiple predetermined first candidate phase sequences, including: for one candidate phase sequence among the multiple first candidate phase sequences, in the case of one candidate phase sequence, determining the maximum sheath current among the single-phase sheath currents corresponding to the three-phase electricity; based on the maximum sheath current, determining the target probability corresponding to a candidate phase sequence; and determining the target probabilities corresponding to multiple first candidate phase sequences by determining the target probability corresponding to a candidate phase sequence.

[0009] Optionally, the method also includes: when there are multiple phase sequences with the highest target probabilities among multiple first candidate phase sequences, the multiple phase sequences with the highest target probabilities are set as multiple second candidate phase sequences; based on the cable sheath current and AC resistance corresponding to the target cable, the heating powers corresponding to the multiple second candidate phase sequences are determined; and the phase sequence with the lowest heating power among the multiple second candidate phase sequences is determined as the target phase sequence.

[0010] Optionally, the method also includes: determining multiple third candidate phase sequences; determining the effective current values ​​corresponding to the target cable under the multiple third candidate phase sequences; removing phase sequences with the same effective current values ​​from the multiple third candidate phase sequences to obtain multiple first candidate phase sequences.

[0011] Optionally, the method also includes: acquiring three-dimensional spatial data and texture data of the target cable; rendering based on the three-dimensional spatial data and texture data to obtain a simulated structure of the target cable; and visually annotating the simulated structure using a target phase sequence according to a configuration of the target cable.

[0012] According to another aspect of an embodiment of the present application, a phase sequence correction device is provided, including: a current load data acquisition module, used to acquire current load data of a target cable in an initial phase sequence; a cable sheath current determination module, used to determine, based on the current load data, the cable sheath currents corresponding to the target cable in a plurality of predetermined first candidate phase sequences; a target probability determination module, used to determine the target probabilities corresponding to a plurality of first candidate phase sequences according to the cable sheath currents corresponding to the target cable in a plurality of predetermined first candidate phase sequences, wherein the target probability represents the probability that a grounding current of the target cable is less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; a target phase sequence determination module, used to determine a phase sequence with the largest target probability among the plurality of first candidate phase sequences as the target phase sequence; an initial phase sequence correction module, used to correct the initial phase sequence of the target cable to a target phase sequence, wherein the sheath grounding current of the target cable adopting the target phase sequence is less than the sheath grounding current of the target cable adopting the initial phase sequence.

[0013] According to another aspect of an embodiment of the present application, a non-volatile storage medium is provided, wherein the non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing any one of the phase sequence correction methods.

[0014] According to another aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors implement any one of the phase sequence correction methods.

[0015] In the embodiment of the present application, the current load data of the target cable in the initial phase sequence is obtained; based on the current load data, the cable sheath current corresponding to the target cable in the predetermined multiple first candidate phase sequences is determined; according to the cable sheath current corresponding to the target cable in the predetermined multiple first candidate phase sequences, the target probability corresponding to the multiple first candidate phase sequences is determined, wherein the target probability represents the probability that the grounding current of the target cable is less than the predetermined threshold value when the corresponding first candidate phase sequence is adopted; the phase sequence with the largest target probability among the multiple first candidate phase sequences is determined as the target phase sequence; the initial phase sequence of the target cable is corrected to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. The purpose of determining the optimal phase sequence of the cable based on the current load data and the cable configuration mode is achieved, and the technical effect of reducing the cable sheath current by correcting the cable phase sequence is achieved, thereby solving the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 is a flow chart of an optional phase sequence correction method provided according to an embodiment of the present application;

[0018] Figure 2 is a first circuit schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0019] Figure 3 is a second circuit schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0021] Figure 5 is a first current load schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0022] Figure 6 is a second current load schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0023] Figure 7 is a first model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0024] Figure 8is a second model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0025] Fig. 9 is a target probability schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0026] Fig.10 is a first current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0027] Fig.11 is a second current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0028] Fig.12 is a third current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0029] Fig.13 is a fourth current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0030] Fig.14 is a third model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0031] Fig.15 is a fourth model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application;

[0032] Fig.16 It is a schematic diagram of an optional phase sequence correction device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0036] Digital twin technology is a simulation process that integrates multiple disciplines, multiple physical quantities, multiple scales, and multiple probabilities. It can create digital mappings of physical entities in virtual space to reflect the entire life cycle of physical entities from design, manufacturing, operation to maintenance and scrapping, and provide accurate and efficient support for the optimal design, predictive maintenance, fault diagnosis and health monitoring of products and systems.

[0037] A 3D digital model is a virtual three-dimensional space representation created in a computer system. It can reproduce real objects or scenes in detail, including their geometric shape, physical properties and functional characteristics, and provides a powerful visualization tool and data foundation for design, analysis, display and management.

[0038] A transmission corridor, also known as a power corridor or power tunnel, is an underground or ground channel structure used to centrally accommodate, lay and maintain power cables, communication cables and other electrical equipment. Transmission corridors have long distances and large capacities and are often used in urban underground power grids, large industrial areas, cross-sea cable systems and other scenarios.

[0039] Angular resolution (AR) refers to the ability of a sensor or measuring device to distinguish between two adjacent targets in space. It is usually used to describe the spatial positioning accuracy of optical, radar, sonar, laser scanner and other systems.

[0040] Laser Point Cloud Technology (LPCT) is a method that uses laser scanning equipment to emit laser pulses and receive light signals reflected from the surface of an object, measures the time from laser emission to return or the change in light intensity, and then obtains three-dimensional spatial data.

[0041] According to an embodiment of the present application, a method embodiment of phase sequence correction is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0042] Figure 1 is a flow chart of an optional phase sequence correction method provided according to an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0043] Step S102, obtaining current load data of the target cable in an initial phase sequence;

[0044] It can be understood that the current load data of the target cable under the initial phase sequence is obtained. The above initial phase sequence refers to the actual phase sequence of the cable. The above current load data is the actual load data of the load current combination in a fixed period of time, which is used to determine the magnitude of the target cable core current. By obtaining the current load data of the target cable under the initial phase sequence and optimizing the phase sequence of the target cable, it can ensure a comprehensive understanding of the operating characteristics of the cable under a specific phase sequence, and provide a scientific basis for sheath circulation suppression, cable heating control, and power system performance improvement.

[0045] Step S104, determining the cable sheath currents corresponding to the target cable under a plurality of predetermined first candidate phase sequences based on the current load data;

[0046] It can be understood that according to the configuration mode of the target cable, the phase sequence combinations that can be composed of the target cable are enumerated and simplified to obtain multiple first candidate phase sequences of the target cable, and the cable sheath currents corresponding to these multiple first candidate phase sequences are calculated. By enumerating and simplifying the phase sequence combinations of the target cable and calculating the cable sheath current under each phase sequence, not only can the impact of different phase sequences on cable performance be comprehensively evaluated, but also the calculation efficiency can be improved to ensure the safety and stability of cable operation.

[0047] In an optional embodiment, based on current load data, the cable sheath currents corresponding to the target cable in multiple predetermined first candidate phase sequences are determined, including: based on current frequency and earth equivalent loop depth, the inductance parameters corresponding to the target cable in multiple first candidate phase sequences are determined, wherein the earth equivalent loop depth represents the response characteristics of the earth to the current in the target cable at the current frequency; according to the current load data, the inductance parameters corresponding to the multiple first candidate phase sequences, and the configuration of the target cable, the cable sheath currents corresponding to the multiple first candidate phase sequences are obtained.

[0048] It can be understood that according to the cable layout cross-sectional drawings, electrical parameters, load parameters and environmental parameters, a cross-connection model of the target cable is constructed, and based on the cross-connection model of the target cable, an equivalent circuit diagram of the cross-connection of the target cable is established. According to the cross-connection equivalent circuit diagram of the target cable, the sheath current of the target cable is calculated. First, based on the current frequency and the depth of the earth equivalent loop, the inductance parameter of the target cable, that is, the inductive reactance of the target cable, is determined, wherein the above-mentioned earth equivalent loop depth can be used to measure the response characteristics of the earth to the current in the target cable at the current frequency. Secondly, based on the current load, inductance parameters and configuration mode of the target cable, the sheath current of the target cable is obtained. Through the above steps, the cable sheath currents corresponding to the multiple first candidate phase sequences of the target cable can be obtained. Constructing a cross-connection model of the target cable and calculating the cable sheath current under different phase sequences can not only improve the efficiency of cable line design, operation and maintenance, and fault prevention, but also ensure that the power system maintains the best performance under various operating conditions, which is of great significance to improving the reliability of the power system.

[0049] In an optional embodiment, the inductance parameters include cable self-inductance and cable mutual inductance, and according to current load data, the inductance parameters corresponding to multiple first candidate phase sequences, and the configuration mode of the target cable, the cable sheath currents corresponding to multiple first candidate phase sequences are obtained, including: based on the cable self-inductance corresponding to multiple first candidate phase sequences, the cable sheath impedances corresponding to multiple first candidate phase sequences are obtained; based on the cable mutual inductance corresponding to the first candidate phase sequences, and the current load data, the core induced electromotive force corresponding to multiple first candidate phase sequences is determined; according to the configuration mode, and the cable sheath impedances and core induced electromotive force corresponding to multiple first candidate phase sequences, the cable sheath currents corresponding to multiple first candidate phase sequences are determined.

[0050] It can be understood that the inductance parameters include cable self-inductance and cable mutual inductance. Cable self-inductance refers to an impedance characteristic generated by electromagnetic induction between the cable and the surrounding medium; cable mutual inductance refers to an impedance characteristic generated by electromagnetic induction between cables. Based on the self-inductance of the target cable, the target cable sheath impedance can be determined. Based on the mutual inductance and current load data of the target cable, the core induced electromotive force can be obtained, that is, the induced electromotive force generated by the core current on the cable sheath. According to the configuration mode of the target cable, based on the above-mentioned target cable sheath impedance and core induced electromotive force, the sheath current of the target cable can be obtained. Through the above steps, the cable sheath currents corresponding to multiple first candidate phase sequences of the target cable can be obtained. By calculating the cable sheath current under different phase sequences in the above manner, accurate cable sheath current results can be obtained, which provides data support for subsequent scientific decisions on optimizing cable operation safety, cable maintenance and life management, and phase sequence optimization.

[0051] Optionally, Figure 2 is a first circuit diagram of an optional phase sequence correction method provided according to an embodiment of the present application, such as Figure 2 The figure shows a predetermined cable cross-connection grounding model, which is constructed based on information such as cable layout cross-section drawings, electrical parameters, load parameters, and environmental parameters. Figure 2 In the cable cross-interconnection grounding model, the cable adopts a single-circuit, three-phase cross configuration, in which each phase of the three-phase cable includes a core and a metal sheath, the two ends of the cable are directly grounded, and the middle is grounded by cross-interconnection.

[0052] Figure 3 is a second circuit diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Figure 3 is based on Figure 2 The equivalent circuit diagram of the cable cross-connection grounding model is established. Figure 3 In, R g Represents earth resistance, R d1 and R d2 They represent the grounding resistance at both ends of the cable, Z1, Z2 and Z3 represent the impedance of the three-phase cable, and Respectively represent the sheath current of the three-phase cable, Indicates the ground current of the cable, It represents the induced electromotive force generated by the core current. The induced electromotive force i and a generated by the sheath current represent the i-th phase and the a-th phase of the tertiary cable respectively.

[0053] Optionally, for a single-circuit three-phase cable, the self-inductance per unit length of the i-th phase cable sheath is X i , with the unit of Ω / m (ohm / meter):

[0054]

[0055] Where, π represents pi; f represents the core current frequency, the unit is Hz (Hertz); D e Indicates the depth of the earth's equivalent loop, in m (meter); r i,GMR represents the geometric mean radius of the i-th phase cable sheath, in m; ρ g Represents the earth resistivity, the unit is Ω·m (ohm·meter); d b1i Indicates the inner diameter of the cable sheath of phase i, in mm (millimeter); d b2i Represents the outer diameter of the cable sheath of the i-th phase, in mm.

[0056] The mutual inductance between the i-th phase cable and the a-th phase cable is X ia(i=1, 2, 3; a=1, 2, 3), unit is Ω / m:

[0057]

[0058] Among them, d ia It represents the center distance between the i-th phase cable and the a-th phase cable, in meters.

[0059] Optionally, for a single-circuit three-phase cable, the three phases are numbered 1, 2, and 3 respectively, and the induced electromotive force generated on the sheath includes the induced electromotive force generated by the three-phase core current on the sheath and the induced electromotive force generated by the other two-phase sheath currents. for:

[0060]

[0061] in, and They represent the three-phase core currents of the cable respectively; l1, l2 and l3 represent the cross-connection lengths of the three cable sections respectively, and j represents the sign of the imaginary part.

[0062] The induced electromotive force generated by the sheath current on the three-phase sheath for:

[0063]

[0064] According to Kirchhoff's law, we can get:

[0065]

[0066] Substituting the above formulas (5) and (6) into formula (7), we can get the three-phase sheath current of the cable: and and ground current of the cable

[0067] Alternatively, for the calculation of multi-circuit cable sheath current, it is only necessary to expand the matrices of formulas (5), (5) and (7).

[0068] In an optional embodiment, the method also includes: determining multiple third candidate phase sequences; determining the effective current values ​​corresponding to the target cable under multiple third candidate phase sequences; removing phase sequences with the same effective current values ​​from the multiple third candidate phase sequences to obtain multiple first candidate phase sequences.

[0069] It can be understood that the harm caused by excessive sheath current is only related to the effective value of the current and has nothing to do with the phase. Therefore, the cable phase sequence can be simplified according to the effective value of the current. First, according to the configuration mode of the cable and the number of phases of the cable, the enumeration method is used to determine multiple third candidate phase sequences of the cable, that is, all phase sequence combinations of the cable. Determine the effective current values ​​corresponding to the multiple third candidate phase sequences of the target cable, and retain one of them in the phase sequence group with the same effective current value, and remove the rest. All the retained phase sequences are the multiple first candidate phase sequences of the above-mentioned target cable. Simplifying the cable phase sequence based on the effective value of the current not only improves the calculation efficiency and decision-making quality, reduces data redundancy, but also promotes the intelligence of cable design, operation and maintenance, and fault prevention, which is of great significance to ensure the safe and stable operation and optimized design of the power system.

[0070] Step S106, determining target probabilities corresponding to multiple first candidate phase sequences respectively according to the cable sheath currents corresponding to the target cable under multiple predetermined first candidate phase sequences, wherein the target probability represents the probability of the target cable having a grounding current less than a predetermined threshold value when the corresponding first candidate phase sequence is used;

[0071] It can be understood that after obtaining the cable sheath current of the target cable, the target probability, that is, the probability that the grounding current does not exceed the standard, is obtained based on the maximum value of the sheath current of different phases in the cable sheath current and the current load data. The above target probability indicates that when this phase sequence is used, under the above current load data, the probability that the grounding current of the target cable does not exceed the predetermined threshold value. Through the above steps, the target probabilities corresponding to multiple first candidate phase sequences of the target cable can be calculated. By determining the probability that the cable sheath grounding current does not exceed the standard under different phase sequences, it can not only promote the scientific and intelligent operation and maintenance decision-making, but also improve the safety and stability of the power system operation.

[0072] In an optional embodiment, the cable sheath current includes single-phase sheath currents corresponding to the three-phase electricity included in the target cable, and the target probabilities corresponding to the multiple first candidate phase sequences are determined according to the cable sheath currents corresponding to the target cable in multiple predetermined first candidate phase sequences, including: for one candidate phase sequence among the multiple first candidate phase sequences, in the case of a candidate phase sequence, determining the maximum sheath current among the single-phase sheath currents corresponding to the three-phase electricity; based on the maximum sheath current, determining the target probability corresponding to a candidate phase sequence; and determining the target probabilities corresponding to multiple first candidate phase sequences by determining the target probability corresponding to a candidate phase sequence.

[0073] It can be understood that the target cable is a three-phase cross-interconnected cable, that is, the three-phase electricity included in the target cable has a sheath current in each phase. Under a certain phase sequence (the phase sequence belongs to multiple first candidate phase sequences of the target cable), the maximum sheath current is obtained according to the calculation result of the three-phase sheath current of the target cable, and the target probability of the determined phase sequence is obtained based on the above maximum sheath current. In the above manner, the target probabilities corresponding to multiple first candidate phase sequences of all target cables can be obtained. Through the quantified target probability, the risk level of cable sheath current exceeding the standard under different phase sequences can be accurately evaluated, providing operation and maintenance personnel with a scientific basis for phase sequence optimization decision-making, and reducing safety hazards in cable operation.

[0074] Optionally, the target probability of the target cable, that is, the probability that the cable sheath grounding current does not exceed the standard P c for:

[0075]

[0076] Wherein, n represents the nth current load data, N represents the number of current load data; c represents the cth phase sequence among the multiple first candidate phase sequences of the target cable; U c，n Indicates the maximum sheath current of the three-phase sheath current of the cable, U' c，n Indicates whether the cth phase sequence among the multiple first candidate phase sequences of the target cable under the nth current load data condition exceeds a predetermined threshold. If U' c，n =1, indicating that the phase sequence does not exceed the predetermined threshold. If U' c，n =0, indicating that the phase sequence exceeds the predetermined threshold. From formula (8), it can be seen that the probability P of the cable sheath grounding current not exceeding the standard c The larger the value is, the smaller the possibility of the target cable grounding current exceeding the standard in the cth phase sequence is under the condition of the N current load data, and the better the phase sequence is. c The smaller it is, the greater the possibility that the target cable grounding current of the cth phase sequence exceeds the standard under the N current load data conditions.

[0077] Optionally, the absolute value of the grounding current of a single-circuit cable line should be less than 100A (ampere), so the sheath current value of each phase cable should be less than 33.3A, that is, the predetermined threshold value of the grounding current of the target cable is 100A, and the predetermined threshold value of the sheath current of each phase cable is 33.3A.

[0078] Step S108, determining a phase sequence with the highest target probability among the plurality of first candidate phase sequences as the target phase sequence;

[0079] It can be understood that based on the target probabilities corresponding to the multiple first candidate phase sequences of the target cable, the phase sequence with the largest target probability is determined and used as the target phase sequence. The maximum risk of the cable can be determined by the target probability, and corresponding decision optimization, risk avoidance and fault prevention can be performed to improve the safety and reliability of the power system.

[0080] In an optional embodiment, the method also includes: when there are multiple phase sequences with the highest target probabilities among multiple first candidate phase sequences, the multiple phase sequences with the highest target probabilities are set as multiple second candidate phase sequences; based on the cable sheath current and AC resistance corresponding to the target cable, the heating powers corresponding to the multiple second candidate phase sequences are determined; and the phase sequence with the lowest heating power among the multiple second candidate phase sequences is determined as the target phase sequence.

[0081] It can be understood that the target probabilities corresponding to the multiple first candidate phase sequences of the target cable can be obtained through the maximum sheath current of the cable. The phase sequence with the largest target probability is the optimal phase sequence of the target cable. When the optimal phase sequence is unique, the optimal phase sequence is the target phase sequence of the target cable. When the optimal phase sequence is not unique, the above multiple optimal phase sequences (i.e., the phase sequence with the largest target probability) are used as multiple second candidate phase sequences of the target cable. Based on the cable sheath current and AC resistance corresponding to the target cable, the heating powers corresponding to the multiple second candidate phase sequences are determined, and the phase sequence with the smallest heating power is selected as the target phase sequence of the target cable. By further selecting the phase sequence with the smallest heating power as the target phase sequence among the multiple phase sequences with the largest target probabilities, decision support can be provided for the phase sequence optimization and risk assessment of the cable, and the safety, stability and operation efficiency of the power system can be improved.

[0082] Optionally, when there are multiple target probabilities among the multiple first candidate phase sequences of the target cable, the heating power of the multiple target probabilities of the phase sequences with the maximum probability is calculated. Determine the target phase sequence of the target cable. The formula is:

[0083]

[0084] Where K represents the number of cable configurations, I k The maximum sheath current of the three-phase sheath current of the k-th cable, R k Represents the AC resistance of the kth cable.

[0085] Step S110, correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is smaller than the sheath grounding current of the target cable using the initial phase sequence.

[0086] It can be understood that the target phase sequence of the target cable determined based on the target probability and heating power can effectively reduce the sheath current of the target cable. Therefore, the initial phase sequence of the target cable is corrected to the target phase sequence to achieve the purpose of reducing the sheath grounding current of the target cable. Determining the optimal phase sequence based on the target probability and heating power and adjusting the initial phase sequence of the cable can not only significantly reduce the sheath grounding current and cable heating, improve the safety and stability of the power system operation, but also promote the intelligent operation and maintenance of the power system, and provide support for the optimal design of the cable and the allocation of power system resources.

[0087] In an optional embodiment, the method further includes: acquiring three-dimensional spatial data and texture data of the target cable; rendering based on the three-dimensional spatial data and texture data to obtain a simulation structure of the target cable; and visually annotating the simulation structure using a target phase sequence according to a configuration of the target cable.

[0088] It can be understood that the three-dimensional spatial data and texture data of the target cable are obtained, and the three-dimensional spatial data and texture data are preprocessed. Based on the preprocessed three-dimensional spatial data and texture data, a simulation structure of the target cable is constructed using three-dimensional modeling software. By constructing the simulation structure of the target cable, the target phase sequence of the target cable and the simulation structure of the target cable are associated, and the configuration method and target phase sequence of the target cable are visualized in the simulation structure of the target cable. By constructing the simulation structure of the target cable, the complex cable configuration method and phase sequence optimization results can be presented in the form of intuitive three-dimensional images, which helps operation and maintenance personnel or decision makers to understand the operating status of the cable and the optimized phase sequence more quickly and accurately, and improve the intuitiveness and efficiency of decision-making.

[0089] Through the above step S102, the current load data of the target cable in the initial phase sequence is obtained; step S104, based on the current load data, the cable sheath current corresponding to the target cable in the predetermined multiple first candidate phase sequences is determined; step S106, according to the cable sheath current corresponding to the target cable in the predetermined multiple first candidate phase sequences, the target probability corresponding to the multiple first candidate phase sequences is determined, wherein the target probability represents the probability that the target cable has a grounding current less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; step S108, the phase sequence with the largest target probability among the multiple first candidate phase sequences is determined as the target phase sequence; step S110, the initial phase sequence of the target cable is corrected to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. The purpose of determining the optimal phase sequence of the cable based on the current load data and the cable configuration mode can be achieved, and the technical effect of reducing the cable sheath current by correcting the cable phase sequence is achieved, thereby solving the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in the related art.

[0090] Based on the above-mentioned embodiments and optional embodiments, the present application proposes an optional implementation method for correcting the initial phase sequence of the cable, and using a cable simulation structure to visually mark the corrected cable phase sequence. Figure 4 is a schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, such as Figure 4 As shown in the figure, the cable phase sequence correction is divided into three parts: corridor three-dimensional modeling, that is, building the simulation structure of the target cable, establishing the phase sequence database, and three-dimensional model display and interaction. For the simulation structure of the target cable, it includes the three-dimensional structure of the cable and the three-dimensional structure of the transmission corridor where the cable is located. For corridor three-dimensional modeling, the point cloud data of the transmission corridor and the target cable can be obtained by three-dimensional laser scanning, and the point cloud data can be preprocessed to obtain the spatial data of the transmission corridor and the target cable; the texture data of the transmission corridor and the target cable can be obtained by texture mapping acquisition and texture mapping production. Based on the above spatial data and texture data, the transmission corridor and the target cable are three-dimensionally modeled to obtain the simulation structure of the target cable. For the establishment of the phase sequence database, the current load data within a certain period of time is obtained through the current load curve, the cross-interconnection grounding model of the target cable is constructed based on the electrical parameters and environmental parameters, and the phase sequence combination of the target cable is enumerated and simplified according to the configuration mode of the target cable. Based on the above current load data, the cross-interconnection grounding model of the target cable and the simplified phase sequence of the target cable, the sheath current of the target cable under each simplified phase sequence is obtained. Based on the sheath current of the target cable under each simplified phase sequence, the probability of the grounding current not exceeding the standard (i.e., target probability) and the expected sheath heating power (i.e., heating power) of the target cable under each simplified phase sequence are obtained. Based on the target probability and heating power of the target cable, the target phase sequence of the target cable under the current load data is obtained, and a phase sequence database is constructed. For the three-dimensional model display and interaction, the phase sequence database is associated with the corridor three-dimensional model, and the corridor roaming program and the cable phase sequence interaction interface are established. By clicking on the corresponding cable line model, the corresponding cable line attribute parameters, grounding current deduction process and optimal phase sequence recommendation visualization results can be obtained.

[0091] For the three-dimensional modeling of the corridor, the simulation structure of the target cable is constructed. The first is the acquisition of the three-dimensional data of the outer contour of the transmission corridor. The three-dimensional information of the outer contour of the transmission corridor can be obtained by setting up a three-dimensional laser scanner on the ground. The three-dimensional laser scanner needs to be stationary for a period of time for the first scan to improve the accuracy of the inclination sensor inside the instrument. Set the scanning angular resolution, field of view, point cloud channel and other parameters according to actual needs, and select the appropriate three-dimensional laser scanner station location according to the visual conditions in the corridor. The point cloud data obtained by the three-dimensional laser scanner is preprocessed, and the preprocessing can be performed by splicing and denoising. First, select the same-name points through rough splicing, align the overlapping parts between two adjacent stations, and then finely splice the point cloud data, that is, perform overall adjustment processing on the rough spliced ​​point cloud data according to the data of targets, control points, etc., and finally use statistical filtering methods to remove noise points in the point cloud and manually remove point cloud data that is not related to the acquisition target. Based on the above process, the three-dimensional spatial data of the outer contour of the transmission corridor can be obtained. The second is the data collection inside the transmission corridor, including the collection of spatial data and the collection of data. Laser point cloud technology and robot cruising can be used to collect 3D spatial data in the transmission corridor, and comprehensive texture data in the transmission corridor can be obtained by integrating existing drawings, equipment information and other materials. Based on the 3D spatial data of the outer contour of the transmission corridor, the 3D spatial data in the transmission corridor and the texture data in the transmission corridor, the simulation structure of the target cable is constructed using 3D modeling software, and the model is refined using methods such as texture mapping and lighting rendering.

[0092] The phase sequence database of the target cable is established. First, the current load data within a certain period of time is obtained through the current load curve. For the cable lines that are actually put into operation or have load predictions, the actual load data can be obtained for the load current combination within a fixed period of time. Figure 5 1 is a first current load schematic diagram of an optional phase sequence correction method provided in an embodiment of the present application, taking a double-circuit parallel cable line as an example, Figure 5 The first cable line takes a set of current load data every hour in one year. The horizontal axis of the curve represents time, and the vertical axis represents current load. A total of 8760 sets of data are obtained, forming the following Figure 5 The current load curve is shown. Figure 6 1 is a second current load schematic diagram of an optional phase sequence correction method provided in an embodiment of the present application, taking a double-circuit parallel cable line as an example, Figure 6 The second cable line takes a set of current load data every hour in one year. The horizontal axis of the curve represents time, and the vertical axis represents current load. A total of 8760 sets of data are obtained, forming the following Figure 6 The current load curve is shown.

[0093] Secondly, the target cable cross-connection grounding model is constructed based on electrical parameters and environmental parameters, and the phase sequence combination of the target cable is enumerated and simplified according to the target cable configuration mode. The target cable cross-connection grounding model is established by obtaining information such as the target cable laying cross-section drawing, electrical parameters, load parameters and environmental parameters, and the target cable cross-connection equivalent circuit diagram is established based on the cross-connection grounding model. Figure 2 That is, a predetermined cable cross-connection grounding model, 3 is based on Figure 2 The equivalent circuit diagram of the cable cross-connection grounding model is established. Since the damage caused by excessive sheath current is only related to the effective value of the current and has nothing to do with the phase, the phase sequence of the target cable can be enumerated and simplified according to the target cable configuration method. For phase sequence enumeration, take a multi-circuit parallel laying and configuration cable line as an example. If the number of circuits is k, there are 3k cables in total, and the phase sequence arrangement methods that can be formed are (3!) k For phase sequence simplification, since the damage caused by excessive sheath current is only related to the effective value of the current and has nothing to do with the phase, if the three-phase load current of each circuit is balanced, (3!) k The phase sequence arrangement is simplified to 2×6 n-1 Taking a double-circuit parallel cable line as an example, A, B, and C represent the three-phase sequence numbers of the cable. The cable sheath current results obtained under the phase sequence of BCA / BCA and CAB / CAB are the same as the effective value of the cable sheath current obtained under the phase sequence of ABC / ABC.

[0094] Then, based on the above current load data, the cross-connected grounding model of the target cable and the simplified phase sequence of the target cable, the sheath current of the target cable under each simplified phase sequence is obtained. Based on the current frequency and the earth equivalent loop depth, the inductance parameter of the target cable, that is, the inductive reactance of the target cable, is determined, wherein the above earth equivalent loop depth can be used to measure the response characteristics of the earth to the current in the target cable at the current frequency. Secondly, based on the current load, inductance parameters and configuration mode of the target cable, the sheath current of the target cable is obtained. Through the above steps, the cable sheath currents corresponding to multiple first candidate phase sequences (that is, simplified target cable phase sequences) of the target cable can be calculated.

[0095] The above-mentioned inductance parameters include cable self-inductance and cable mutual inductance. Cable self-inductance refers to an impedance characteristic generated by electromagnetic induction between the cable and the surrounding medium; cable mutual inductance refers to an impedance characteristic generated by electromagnetic induction between cables. Based on the self-inductance of the target cable, the target cable sheath impedance can be determined. Based on the mutual inductance and current load data of the target cable, the core induced electromotive force can be obtained, that is, the induced electromotive force generated by the core current on the cable sheath. According to the configuration mode of the target cable, based on the above-mentioned target cable sheath impedance and core induced electromotive force, the sheath current of the target cable can be obtained. Through the above steps, the cable sheath currents corresponding to multiple first candidate phase sequences of the target cable can be calculated. By calculating the cable sheath current under different phase sequences in the above-mentioned manner, accurate cable sheath current results can be obtained, which provides data support for subsequent scientific decisions on optimizing cable operation safety, cable maintenance and life management, and phase sequence optimization.

[0096] Optionally, for a single-circuit three-phase cable, the self-inductance per unit length of the i-th phase cable sheath is X i , with the unit of Ω / m (ohm / meter):

[0097]

[0098] Where, π represents pi; f represents the core current frequency, the unit is Hz (Hertz); D e Indicates the depth of the earth's equivalent loop, in m (meter); r i,GMR represents the geometric mean radius of the i-th phase cable sheath, in m; ρ g Represents the earth resistivity, the unit is Ω·m (ohm·meter); d b1i Indicates the inner diameter of the cable sheath of phase i, in mm (millimeter); d b2i Represents the outer diameter of the cable sheath of the i-th phase, in mm.

[0099] The mutual inductance between the i-th phase cable and the a-th phase cable is X ia (i=1, 2, 3; a=1, 2, 3), unit is Ω / m:

[0100]

[0101] Among them, d ia It represents the center distance between the i-th phase cable and the a-th phase cable, in meters.

[0102] Optionally, due to electromagnetic induction between metal conductors, when current passes through the cable core, current will be induced on the metal sheath, and the induced electromotive force on the sheath is jointly generated by the core current and the sheath current. For a single-circuit three-phase cable, let the three phases A, B, and C be numbered 1, 2, and 3 respectively. The induced electromotive force generated on its sheath includes the induced electromotive force generated on the sheath by the three-phase core current and the induced electromotive force generated by the other two-phase sheath current.

[0103] The induced electromotive force generated by the core current on the three-phase sheath of the cable for:

[0104]

[0105] in, and They represent the three-phase core currents of the cable respectively; l1, l2 and l3 represent the cross-connection lengths of the three cable sections respectively, and j represents the sign of the imaginary part.

[0106] The induced electromotive force generated by the sheath current on the three-phase sheath for:

[0107]

[0108] According to Kirchhoff's law, we can get:

[0109]

[0110] Substituting the above formulas (5) and (6) into formula (7), we can get the three-phase sheath current of the cable: and and ground current of the cable

[0111] Alternatively, for the calculation of multi-circuit cable sheath current, it is only necessary to expand the matrices of formulas (5), (5) and (7).

[0112] Finally, based on the sheath current of the target cable under each simplified phase sequence, the probability that the grounding current does not exceed the standard (i.e., the target probability) and the expected sheath heating power (i.e., the heating power) of the target cable under each simplified phase sequence are obtained. Based on the target probability and heating power of the target cable, the target phase sequence of the target cable under the current load data is obtained, and a phase succession database is constructed. After obtaining the cable sheath current of the target cable, the target probability, i.e., the probability that the grounding current does not exceed the standard, is obtained based on the maximum value of the sheath current of different phases in the cable sheath current and the current load data. The above target probability represents the probability that the grounding current of the target cable does not exceed the predetermined threshold value under the above current load data when the phase sequence is adopted. Through the above steps, the target probabilities corresponding to the multiple first candidate phase sequences of the target cable can be obtained. The target probabilities corresponding to the multiple first candidate phase sequences of the target cable can be obtained by the maximum sheath current of the cable. The phase sequence with the largest target probability is the optimal phase sequence of the target cable. When the optimal phase sequence is unique, the optimal phase sequence is the target phase sequence of the target cable. When the optimal phase sequence is not unique, the above multiple optimal phase sequences (i.e. the phase sequence with the highest target probability) are used as multiple second candidate phase sequences of the target cable. Based on the cable sheath current and AC resistance corresponding to the target cable, the heating power corresponding to the multiple second candidate phase sequences is determined, and the phase sequence with the lowest heating power is selected as the target phase sequence of the target cable. By further selecting the phase sequence with the lowest heating power as the target phase sequence among the multiple phase sequences with the highest target probability, decision support can be provided for the phase sequence optimization and risk assessment of the cable, and the safety, stability and operation efficiency of the power system can be improved.

[0113] Optionally, for the probability of grounding current not exceeding the standard (i.e., target probability), according to relevant regulations, the absolute value of grounding current of a single-core cable line should be less than 100A, so the sheath circulating current value of each cable should be less than 33.3A. Calculate the probability of grounding current not exceeding the standard P for all simplified phase sequence arrangements c , P c The formula is:

[0114]

[0115] Wherein, n represents the nth current load data, N represents the number of current load data; c represents the cth phase sequence among the multiple first candidate phase sequences of the target cable; U c，n Indicates the maximum sheath current of the three-phase sheath current of the cable, U' c，n Indicates whether the cth phase sequence among the multiple first candidate phase sequences of the target cable under the nth current load data condition exceeds a predetermined threshold. If U' c，n =1, indicating that the phase sequence does not exceed the predetermined threshold. If U' c，n =0, indicating that the phase sequence exceeds the predetermined threshold. From formula (8), it can be seen that the probability P of the cable sheath grounding current not exceeding the standard cThe larger the value is, the smaller the possibility of the target cable grounding current exceeding the standard in the cth phase sequence is under the condition of the N current load data, and the better the phase sequence is. c The smaller it is, the greater the possibility that the target cable grounding current of the cth phase sequence exceeds the standard under the N current load data conditions.

[0116] Optionally, for the expected heating power of the sheath (i.e., heating power), if there are multiple phase sequence arrangements so that the probability P of the sheath grounding current not exceeding the standard is c Maximum and equal, in order to reduce the heating of the cable sheath, calculate the expected value of heating power According to the expected value of heating power The minimum value of determines the target phase sequence. The formula is:

[0117]

[0118] Where, K represents the number of cable configurations, I k The maximum sheath current of the three-phase sheath current of the k-th cable, R k Represents the AC resistance of the kth cable.

[0119] For the three-dimensional model display and interaction, the phase sequence database is associated with the corridor three-dimensional model, and the corridor roaming program and the cable phase sequence interactive interface are established. By clicking on the corresponding cable line model, the corresponding cable line attribute parameters, grounding current deduction process and optimal phase sequence recommendation visualization results can be obtained. The three-dimensional space data and texture data of the target cable are obtained, and the above three-dimensional space data and texture data are preprocessed. Based on the preprocessed three-dimensional space data and texture data, the simulation structure of the target cable is constructed using three-dimensional modeling software. By constructing the simulation structure of the target cable, the target phase sequence of the target cable is associated with the simulation structure of the target cable, and the configuration mode and target phase sequence of the target cable are visually marked in the simulation structure of the target cable. By constructing the simulation structure of the target cable, the complex cable configuration mode and phase sequence optimization results can be presented in the form of intuitive three-dimensional images, which helps operation and maintenance personnel or decision makers to understand the operating status of the cable and the optimized phase sequence more quickly and accurately, and improve the intuitiveness and efficiency of decision-making.

[0120] The phase sequence correction method can be applied to a software application. In this application software, a 220kV (kilovolt) double-circuit cable line in a certain place is taken as an example. A predetermined 3D laser scanner is used to obtain 3D point cloud data in the transmission corridor through ground station setting, and the 3D structure model of the transmission corridor and the 3D structure model of the cable are established in combination with the existing drawings, equipment information and other materials of each equipment in the corridor. Figure 7 is a first model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Figure 7 The three-dimensional structure of the transmission corridor is shown. Figure 7 It includes both the outer contour structure diagram of the transmission corridor and the internal structure diagram of the transmission corridor. Figure 7 The size, structure, internal equipment and other information of the transmission corridor can be seen. Figure 8 is a second model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Figure 8 The three-dimensional structure of the above cable is shown, Figure 8 As shown, the target cable is configured in a double-circuit parallel manner. Figure 8 On the left is a cross-sectional view of the double-circuit parallel cable, in which the three phases of the first circuit cable, i.e. line A cable, are closely arranged in a V-shape, and the second circuit cable, i.e. line C cable, is arranged in a V-shape, with the distance between the lower two phases being 350 mm (millimeter), and the vertical distance between the upper phase and the lower two phases being 450 mm.

[0121] The actual load current data of the line is collected at one-hour intervals within a certain year, and the following is obtained: Figure 5 and Figure 6 The current load curve is shown. The target cable line has a total of 6 cables, and there are 36 phase sequence arrangements as shown in Table 1. Assume that the three-phase load current of each line is balanced, A, B, and C represent the three-phase sequence numbers of the cable, and the sheath circulating current obtained under the phase sequence BCA / BCA and CAB / CAB conditions is the same as the effective value obtained by the phase sequence ABC / ABC. The second column and the third column of Table 1 are 120° behind or ahead of the first column, respectively. The 36 phase sequence arrangements are converted into the 12 phase sequences shown in the first column of Table 1, and the probability of the sheath current of the cable line of the above 12 phase sequences not exceeding is calculated in combination with the data recorded by the load curve.

[0122] Table 1 Phase sequence combination

[0123]

[0124] Fig. 9 is a target probability diagram of an optional phase sequence correction method provided in an embodiment of the present application, Fig. 9 The above 12 phase sequences of cable line sheath current do not exceed the probability results are shown. The horizontal axis represents the phase sequence combination, and the vertical axis represents the probability of cable line sheath current not exceeding the probability. Fig. 9 As shown, when phase sequence No. 6 or No. 8 is used, the probability that the sheath current of the two cables does not exceed 33.3A is 100%.

[0125] Fig.10 is a first current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Fig.10It shows that when the cable adopts phase sequence 6, the sheath current of the first circuit cable changes with the load current, such as Fig.10 As shown, the two dotted lines represent the line with a sheath current of 33.3A. The cable sheath current in the O area above the two dotted lines is greater than 33.3A, the cable sheath current in the D area between the two dotted lines is less than 33.3A, and the cable sheath current in the Q area is greater than 33.3A. Fig.11 is a second current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Fig.11 It shows that when the cable adopts phase sequence 6, the sheath current of the second cable changes with the load current, such as Fig.11 As shown, the two dotted lines represent the line with a sheath current of 33.3A. The cable sheath current in the O area above the two dotted lines is greater than 33.3A, the cable sheath current in the D area between the two dotted lines is less than 33.3A, and the cable sheath current in the Q area is greater than 33.3A. Fig.12 is a third current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Fig.12 It shows that when the cable adopts phase sequence 8, the sheath current of the first circuit cable changes with the load current, such as Fig.12 As shown, the two dotted lines represent the line with a sheath current of 33.3A. The cable sheath current in the O area above the two dotted lines is greater than 33.3A, the cable sheath current in the D area between the two dotted lines is less than 33.3A, and the cable sheath current in the Q area is greater than 33.3A. Fig.13 is a fourth current schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Fig.13 It shows that when the cable adopts phase sequence 8, the sheath current of the second cable changes with the load current, such as Fig.13 As shown, the two dotted lines represent the line with a sheath current of 33.3A. The cable sheath current in the O area above the two dotted lines is greater than 33.3A, the cable sheath current in the D area between the two dotted lines is less than 33.3A, and the cable sheath current in the Q area is greater than 33.3A.

[0126] Since the optimal phase sequence is not unique, it is necessary to further compare the expected values ​​of the heating power of the cable sheath current under the two phase sequences of No. 6 and No. 8. The results are shown in Table 2. When the No. 8 phase sequence is used, the sum of the expected values ​​of the heating power of the sheath current of the two cables is the smallest. Figure 5 Under the current load curve distribution conditions shown, the target phase sequence of the target cable is phase sequence 8. Fig.14 is a third model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Fig.14 The visualization result of the first cable when the target cable is arranged in phase sequence 8 is shown. Fig.14 The phase sequence, arrangement, cable properties and other information of the first cable can be obtained. Fig.15 is a fourth model schematic diagram of an optional phase sequence correction method provided according to an embodiment of the present application, Fig.15 The visualization result of the second cable when the target cable is arranged in phase sequence 8 is shown. Fig.15 The phase sequence, arrangement, cable properties and other information of the second cable can be obtained.

[0127] Table 2 Expected values ​​of heating power of sheath current under different phase sequence arrangements

[0128]

[0129] The above optional implementation manner achieves at least the following effects: the number of cable phase sequence combinations is simplified through the cable configuration method, and the target phase sequence of the cable is selected based on the two judgment conditions of target probability and heating power, which not only improves the calculation efficiency, but also provides decision support for the phase sequence optimization of the cable; by constructing a simulation structure of the cable and linking it with the phase sequence database of the cable, the cable configuration method and the target phase sequence can be visually marked in the simulation structure of the target cable, so that the complex cable configuration method and phase sequence optimization results can be presented in the form of intuitive three-dimensional images.

[0130] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0131] In this embodiment, a phase sequence correction device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the terms "module" and "device" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0132] According to an embodiment of the present application, a device embodiment for implementing a phase sequence correction method is also provided. Fig.16 is a schematic diagram of a phase sequence correction device according to an embodiment of the present application, such as Fig.16 As shown, the above-mentioned phase sequence correction device, current load data acquisition module 1602, cable sheath current determination module 1604, target probability determination module 1606, target phase sequence determination module 1608, initial phase sequence correction module 1610, the device is described below.

[0133] The current load data acquisition module 1602 is used to acquire the current load data of the target cable when it is in the initial phase sequence;

[0134] The cable sheath current determination module 1604 is connected to the current load data acquisition module 1602 and is used to determine the cable sheath currents corresponding to the target cable under a plurality of predetermined first candidate phase sequences based on the current load data;

[0135] The target probability determination module 1606 is connected to the cable sheath current determination module 1604, and is used to determine the target probabilities corresponding to the multiple first candidate phase sequences according to the cable sheath currents corresponding to the target cable under the predetermined multiple first candidate phase sequences, wherein the target probability represents the probability that the grounding current of the target cable is less than the predetermined threshold value when the corresponding first candidate phase sequence is used;

[0136] A target phase sequence determination module 1608, connected to the target probability determination module 1606, is used to determine a phase sequence with the largest target probability among the plurality of first candidate phase sequences as the target phase sequence;

[0137] The initial phase sequence correction module 1610 is connected to the target phase sequence determination module 1608, and is used to correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is smaller than the sheath grounding current of the target cable using the initial phase sequence.

[0138] In a phase sequence correction device provided in an embodiment of the present application, a current load data acquisition module 1602 is set to obtain the current load data of the target cable in the initial phase sequence; a cable sheath current determination module 1604 is connected to the current load data acquisition module 1602, and is used to determine the cable sheath currents corresponding to the target cable in the predetermined multiple first candidate phase sequences based on the current load data; a target probability determination module 1606 is connected to the cable sheath current determination module 1604, and is used to determine multiple cable sheath currents corresponding to the target cable in the predetermined multiple first candidate phase sequences according to the cable sheath currents corresponding to the target cable in the predetermined multiple first candidate phase sequences. The target probabilities corresponding to the first candidate phase sequences are respectively, wherein the target probability indicates the probability of the target cable having a grounding current less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; the target phase sequence determination module 1608 is connected to the target probability determination module 1606, and is used to determine the phase sequence with the largest target probability among the multiple first candidate phase sequences as the target phase sequence; the initial phase sequence correction module 1610 is connected to the target phase sequence determination module 1608, and is used to correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. The purpose of determining the optimal phase sequence of the cable based on the current load data and the cable configuration mode is achieved, and the technical effect of reducing the cable sheath current by correcting the cable phase sequence is achieved, thereby solving the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in the related art.

[0139] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0140] It should be noted that the current load data acquisition module 1602, the cable sheath current determination module 1604, the target probability determination module 1606, the target phase sequence determination module 1608, and the initial phase sequence correction module 1610 correspond to steps S102 to S110 in the embodiment, and the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the above modules can be run in a computer terminal as part of the device.

[0141] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in the embodiment, which will not be repeated here.

[0142] The above-mentioned phase sequence correction device may also include a processor and a memory. The current load data acquisition module 1602, the cable sheath current determination module 1604, the target probability determination module 1606, the target phase sequence determination module 1608, the initial phase sequence correction module 1610, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize the corresponding functions.

[0143] The processor includes a kernel, which retrieves the corresponding program unit from the memory. There can be one or more kernels. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one storage chip.

[0144] An embodiment of the present application provides a non-volatile storage medium on which a program is stored, and when the program is executed by a processor, a phase sequence correction method is implemented.

[0145] The embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program stored in the memory and can be run on the processor. When the processor executes the program, the following steps are implemented: obtaining the current load data of the target cable in the initial phase sequence; based on the current load data, determining the cable sheath current corresponding to the target cable in the predetermined multiple first candidate phase sequences; according to the cable sheath current corresponding to the target cable in the predetermined multiple first candidate phase sequences, determining the target probability corresponding to the multiple first candidate phase sequences, wherein the target probability represents the probability that the target cable has a grounding current less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; determining the phase sequence with the largest target probability among the multiple first candidate phase sequences as the target phase sequence; correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. The device in this article can be a server, a PC, etc.

[0146] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: obtaining current load data of a target cable in an initial phase sequence; determining, based on the current load data, the cable sheath currents corresponding to the target cable in a plurality of predetermined first candidate phase sequences; determining, according to the cable sheath currents corresponding to the target cable in a plurality of predetermined first candidate phase sequences, the target probabilities corresponding to the plurality of first candidate phase sequences, wherein the target probability represents the probability that a grounding current of the target cable is less than a predetermined threshold value when the corresponding first candidate phase sequence is used; determining the phase sequence with the largest target probability among the plurality of first candidate phase sequences as the target phase sequence; and correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

[0147] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0148] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0149] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0151] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0152] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0153] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0154] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0155] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0156] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A phase sequence correction method, characterized in that: include: Acquire current load data of the target cable when it is in the initial phase sequence; Based on the current load data, determining the cable sheath currents corresponding to the target cable under a plurality of predetermined first candidate phase sequences; According to the cable sheath currents corresponding to the target cable under the predetermined multiple first candidate phase sequences, respectively, the target probabilities corresponding to the multiple first candidate phase sequences are determined, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; Determine a phase sequence with the greatest target probability among the plurality of first candidate phase sequences as a target phase sequence; The initial phase sequence of the target cable is corrected to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is smaller than the sheath grounding current of the target cable using the initial phase sequence.

2. The method according to claim 1, characterized in that The determining, based on the current load data, the cable sheath currents corresponding to the target cable under a plurality of predetermined first candidate phase sequences respectively comprises: Determine the inductance parameters of the target cable corresponding to the multiple first candidate phase sequences respectively based on the current frequency and the earth equivalent loop depth, wherein the earth equivalent loop depth represents the response characteristics of the earth to the current in the target cable at the current frequency; According to the current load data, the inductance parameters respectively corresponding to the multiple first candidate phase sequences, and the configuration mode of the target cable, the cable sheath currents respectively corresponding to the multiple first candidate phase sequences are obtained.

3. The method according to claim 2, characterized in that The inductance parameters include cable self-inductance and cable mutual inductance. The cable sheath currents corresponding to the multiple first candidate phase sequences are obtained according to the current load data, the inductance parameters corresponding to the multiple first candidate phase sequences, and the configuration of the target cable, including: Based on the self-inductance of the cables respectively corresponding to the plurality of first candidate phase sequences, obtaining the sheath impedance of the cables respectively corresponding to the plurality of first candidate phase sequences; Determine the core induced electromotive forces corresponding to the plurality of first candidate phase sequences respectively based on the cable mutual inductances corresponding to the first candidate phase sequences respectively and the current load data; According to the configuration, and the cable sheath impedances and the core induced electromotive forces respectively corresponding to the multiple first candidate phase sequences, the cable sheath currents respectively corresponding to the multiple first candidate phase sequences are determined.

4. The method according to claim 1, characterized in that: The cable sheath current includes single-phase sheath currents corresponding to the three-phase electricity included in the target cable, and the target probabilities corresponding to the multiple first candidate phase sequences are determined according to the cable sheath currents corresponding to the target cable under the predetermined multiple first candidate phase sequences, including: For one candidate phase sequence among the plurality of first candidate phase sequences, in case of the one candidate phase sequence, determining the maximum sheath current among the single-phase sheath currents corresponding to the three-phase electricity respectively; Based on the maximum sheath current, determining a target probability corresponding to the one candidate phase sequence; The target probabilities corresponding to the plurality of first candidate phase sequences are determined in a manner of determining the target probability corresponding to the one candidate phase sequence.

5. The method according to claim 1, characterized in that The method further comprises: In the case that there are multiple phase sequences with the highest target probabilities among the multiple first candidate phase sequences, the multiple phase sequences with the highest target probabilities are used as multiple second candidate phase sequences; Determine the heating powers respectively corresponding to the plurality of second candidate phase sequences based on the cable sheath current and the AC resistance corresponding to the target cable; A phase sequence with the minimum heating power among the plurality of second candidate phase sequences is determined as the target phase sequence.

6. The method according to claim 1, characterized in that The method further comprises: determining a plurality of third candidate phase sequences; Determine the effective current values ​​of the target cable respectively corresponding to the plurality of third candidate phase sequences; The plurality of first candidate phase sequences are obtained by removing phase sequences having the same effective current value from the plurality of third candidate phase sequences.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: Acquiring three-dimensional spatial data and texture data of the target cable; Rendering is performed based on the three-dimensional space data and the texture data to obtain a simulation structure of the target cable; According to the configuration of the target cable, the simulation structure is visually annotated using the target phase sequence.

8. A phase sequence correction device, characterized in that: include: A current load data acquisition module is used to acquire current load data of the target cable when it is in an initial phase sequence; A cable sheath current determination module, used to determine the cable sheath currents corresponding to the target cable under a plurality of predetermined first candidate phase sequences based on the current load data; A target probability determination module is used to determine the target probabilities corresponding to the multiple first candidate phase sequences according to the cable sheath currents corresponding to the target cable under the multiple predetermined first candidate phase sequences, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold value when the corresponding first candidate phase sequence is adopted; a target phase sequence determination module, configured to determine a phase sequence with the highest target probability among the plurality of first candidate phase sequences as the target phase sequence; An initial phase sequence correction module is used to correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is smaller than the sheath grounding current of the target cable using the initial phase sequence.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the phase sequence correction method described in any one of claims 1 to 7.

10. An electronic device, characterized in that: include: One or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the phase sequence correction method described in any one of claims 1 to 7.

Images