Power distribution network arc simulation method and device

Abstract

The embodiment of the invention discloses a power distribution network arc simulation method and device. The method comprises the following steps: establishing a first expression of arc heat per unit length under airflow interference and a second expression of arc diameter under airflow interference; the second expression is substituted into the first expression, then approximate solution is carried out to obtain a third expression of the arc dissipation power per unit length under the airflow interference, and the third expression describes the relation between the arc dissipation power per unit length under the airflow interference and the arc current and the wind speed; a Mayr arc model is improved based on the third expression, and an arc model for the outdoor open scene is obtained; and for the outdoor open scene, performing power distribution network arc simulation by using the arc model for the outdoor open scene. According to the method, the accuracy of power distribution network arc simulation in an outdoor open scene and a closed space scene can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method and device for simulating arcs in a distribution network. Background Art

[0002] At present, the Mayr arc model is often used for arc simulation of distribution networks, but the Mayr arc model makes a lot of simplifications and assumptions when describing arc behavior. In outdoor open scenes, arc grounding faults are affected by multiple physical field factors, such as wind speed. The traditional Mayr arc model cannot accurately reflect the impact of these complex environmental factors on arc behavior, resulting in insufficient simulation accuracy. The prior art lacks a solution to improve the accuracy of arc simulation of distribution networks in outdoor open scenes. Summary of the invention

[0003] In order to solve at least one technical problem in the above-mentioned background technology, the present invention proposes a distribution network arc simulation method and device.

[0004] In order to achieve the above object, according to one aspect of the present invention, a distribution network arc simulation method is provided, the method comprising:

[0005] Establishing a first expression for arc heat per unit length under airflow interference and a second expression for arc diameter under airflow interference, wherein the first expression describes the relationship between arc heat per unit length under airflow interference and wind speed, arc diameter and meteorological constants, and the second expression describes the relationship between arc diameter under airflow interference and arc current and wind speed;

[0006] Substituting the second expression into the first expression, and then approximately solving to obtain a third expression of arc dissipation power per unit length under airflow interference, wherein the third expression describes the relationship between the arc dissipation power per unit length under airflow interference and the arc current and wind speed;

[0007] The Mayr arc model is improved based on the third expression to obtain an arc model for outdoor open scenes;

[0008] For outdoor open scenes, the arc model for outdoor open scenes is used to simulate the arc in the distribution network.

[0009] Optionally, the first expression for establishing the arc heat per unit length under airflow interference includes:

[0010] Obtaining a fourth expression of arc heat per unit length and a fifth expression of heat capacity coefficient per unit volume of air, wherein the fourth expression describes the relationship between arc heat per unit length and heat capacity coefficient per unit volume of air, arc diameter and temperature, and the fifth expression describes the relationship between heat capacity coefficient per unit volume of air and temperature;

[0011] Substituting the fifth expression into the fourth expression, a sixth expression of arc heat per unit length is obtained;

[0012] The sixth expression is approximated in combination with experimental data to obtain the first expression.

[0013] Optionally, the first expression is:

[0014]

[0015] Among them, P K is the arc heat per unit length under airflow interference, k2 is the meteorological constant, d arc is the arc diameter and ν is the wind speed.

[0016] Optionally, the third expression is:

[0017]

[0018] Among them, P loss is the arc power dissipation per unit length under airflow disturbance, I is the arc current, and ν is the wind speed.

[0019] Optionally, the distribution network arc simulation method further includes:

[0020] Obtain the cybernetics model transformed from the Mayr arc model;

[0021] For the confined space scenario, the cybernetics model is used to simulate arc in the distribution network.

[0022] Optionally, the expression of the cybernetics model is:

[0023]

[0024] Among them, g is the instantaneous conductance, t is the time, τ is the time characteristic, G is the static conductance, i is the arc current, Vc is the field strength of the arc gap, Lc is the arc length, and β is the coefficient.

[0025] In order to achieve the above object, according to another aspect of the present invention, a distribution network arc simulation device is provided, the device comprising:

[0026] An expression establishing unit, used to establish a first expression for arc heat per unit length under airflow interference and a second expression for arc diameter under airflow interference, wherein the first expression describes the relationship between arc heat per unit length under airflow interference and wind speed, arc diameter and meteorological constants, and the second expression describes the relationship between arc diameter under airflow interference and arc current and wind speed;

[0027] An arc dissipation power expression determination unit, used for substituting the second expression into the first expression, and then approximately solving to obtain a third expression of the arc dissipation power per unit length under airflow interference, wherein the third expression describes the relationship between the arc dissipation power per unit length under airflow interference and the arc current and wind speed;

[0028] An arc model improvement unit, used for improving the Mayr arc model based on the third expression to obtain an arc model for an outdoor open scene;

[0029] The outdoor open scene simulation unit is used for performing distribution network arc simulation for outdoor open scenes by using the arc model for outdoor open scenes.

[0030] Optionally, the expression building unit includes:

[0031] An acquisition module, used to acquire a fourth expression of arc heat per unit length and a fifth expression of heat capacity coefficient per unit volume of air, wherein the fourth expression describes the relationship between the arc heat per unit length and the heat capacity coefficient per unit volume of air, the arc diameter and the temperature, and the fifth expression describes the relationship between the heat capacity coefficient per unit volume of air and the temperature;

[0032] A calculation processing module, used for substituting the fifth expression into the fourth expression to obtain a sixth expression of arc heat per unit length;

[0033] An expression approximation processing module is used to perform approximation processing on the sixth expression in combination with experimental data to obtain the first expression.

[0034] Optionally, the distribution network arc simulation device further includes:

[0035] A cybernetic model acquisition unit, used for acquiring a cybernetic model transformed from a Mayr arc model;

[0036] The confined space scenario simulation unit is used to perform arc simulation of the distribution network using the cybernetics model for confined space scenarios.

[0037] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned distribution network arc simulation method when executing the computer program.

[0038] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a computer-readable storage medium is further provided, on which a computer program / instruction is stored, and when the computer program / instruction is executed by a processor, the steps of the above-mentioned distribution network arc simulation method are implemented.

[0039] In order to achieve the above object, according to another aspect of the present invention, a computer program product is further provided, comprising a computer program / instruction, which implements the steps of the above distribution network arc simulation method when executed by a processor.

[0040] The beneficial effects of the present invention are:

[0041] The present invention improves the arc dissipation power in the Mayr arc model, proposes an arc model for outdoor open scenarios, improves the accuracy of arc simulation of distribution networks in outdoor open scenarios, provides strong support for ground fault detection, positioning and protection of distribution networks in outdoor open scenarios, and helps to improve the safety and reliability of power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0043] Figure 1 is a first flow chart of the arc simulation method for a distribution network according to an embodiment of the present invention;

[0044] Figure 2 is a second flow chart of the arc simulation method for a distribution network according to an embodiment of the present invention;

[0045] Figure 3 is a third flow chart of the distribution network arc simulation method according to an embodiment of the present invention;

[0046] Figure 4 It is a first structural block diagram of the arc simulation device for a distribution network according to an embodiment of the present invention;

[0047] Figure 5 is a second structural block diagram of the arc simulation device for a distribution network according to an embodiment of the present invention;

[0048] Figure 6 is a third structural block diagram of the arc simulation device for a distribution network according to an embodiment of the present invention;

[0049] Figure 7 It is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0051] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take 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.) containing computer-usable program code.

[0052] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus 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 apparatus.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] It should be noted that the distribution network arc simulation method of the present invention can be used for distribution network grounding fault simulation to achieve detection and location of distribution network grounding fault.

[0055] Figure 1 is a first flow chart of the arc simulation method for distribution network according to an embodiment of the present invention, such as Figure 1 As shown, in one embodiment of the present invention, the distribution network arc simulation method of the present invention includes steps S101 to S104.

[0056] Step S101, establish a first expression for the arc heat per unit length under airflow interference and a second expression for the arc diameter under airflow interference, wherein the first expression describes the relationship between the arc heat per unit length under airflow interference and the wind speed, arc diameter and meteorological constants, and the second expression describes the relationship between the arc diameter under airflow interference and the arc current and wind speed.

[0057] In one embodiment of the present invention, the first expression is:

[0058]

[0059] Among them, P K is the arc heat per unit length under airflow interference, k2 is the meteorological constant, d arc is the arc diameter and ν is the wind speed.

[0060] In one embodiment of the present invention, the second expression is:

[0061]

[0062] Among them, d arc is the arc diameter, ν is the wind speed, and I is the arc current.

[0063] In one embodiment of the present invention, the second expression is obtained by experimental fitting.

[0064] Step S102, substitute the second expression into the first expression, and then approximately solve to obtain a third expression of arc dissipation power per unit length under airflow disturbance, wherein the third expression describes the relationship between arc dissipation power per unit length under airflow disturbance and arc current and wind speed.

[0065] In one embodiment of the present invention, the third expression is:

[0066]

[0067] Among them, P loss is the arc power dissipation per unit length under airflow disturbance, I is the arc current, and ν is the wind speed.

[0068] In the present invention, formula (1) can be first substituted into formula (2) to obtain:

[0069]

[0070] Then simplify the calculation to get:

[0071]

[0072] Then determine the value of k2 through experiments, and substitute it into the above formula to get:

[0073]

[0074] Arcs in an open environment or arcs affected by air currents rely on convection to transfer heat to the outside. K It accounts for more than 80% of the total energy dissipation. The arc dissipation power is mainly heat convection, so it can be approximately considered that:

[0075] P K =P loss Formula (7)

[0076] Therefore, the expression of arc dissipation power per unit length under airflow interference can be obtained as the above formula (3).

[0077] Step S103: improving the Mayr arc model based on the third expression to obtain an arc model for outdoor open scenes.

[0078] In the present invention, the Mayr arc model is specifically:

[0079]

[0080] Where g is the arc conductance, represents the rate of change of conductivity with time, e and i are the voltage and current at both ends of the arc, respectively, τ M is the arc time constant, p loss is the dissipated power.

[0081] In the present invention, this step specifically replaces the dissipated power p in the Mayr arc model with the third expression loss , and obtain the arc model for outdoor open scenes.

[0082] In one embodiment of the present invention, the arc time constant τ in the arc model for outdoor open scenes of the present invention is M The expression is:

[0083]

[0084] Among them, α is the empirical coefficient, which can be verified to be 2.85×10-5; I is the arc current, in A; Lc is the arc length, in cm, which can be the discharge gap during a fault.

[0085] Step S104: for an outdoor open scene, use the arc model for the outdoor open scene to perform arc simulation on the distribution network.

[0086] In some embodiments of the present invention, the method of the present invention further comprises:

[0087] Based on the distribution network arc simulation results, distribution network grounding fault detection is performed to obtain detection results.

[0088] It can be seen that the present invention improves the arc dissipation power in the Mayr arc model, proposes an arc model for outdoor open scenarios, improves the accuracy of arc simulation of distribution networks in outdoor open scenarios, provides strong support for grounding fault detection, positioning and protection of distribution networks in outdoor open scenarios, and helps to improve the safety and reliability of the power system.

[0089] When an arc grounding fault occurs in an overhead distribution line, due to the open environment, the arc burning process will be affected by factors such as multiple physical fields, such as wind speed, humidity, temperature, etc. Since the temperature is very high during the arc burning process, the effect of temperature on the arc can be approximately ignored, and the main influencing factors in the air are still humidity and wind speed. The dissipated power during the arc burning process mainly includes heat convection, heat radiation, and heat conduction, among which heat convection is the main one. Therefore, the present invention proposes an improved Mayr arc model based on adjustable dissipation, which can better meet the arc fault modeling in outdoor open scenarios and meet the actual needs of engineering.

[0090] The arc model proposed by the present invention for outdoor open scenes has the following advantages:

[0091] 1. Environmental adaptability: The model of the present invention can more accurately simulate the arc combustion process in an open outdoor scene by considering the influence of environmental factors such as wind speed and humidity on the arc dissipation power. In particular, the influence of wind speed on arc diameter and dissipation power is calculated by formula derivation, making the model closer to reality.

[0092] 2. Adjustable dissipated power: The dissipated power in the model of the present invention is adjustable, which means that the model parameters can be adjusted according to the actual environmental conditions to more accurately predict the behavior of the arc. This flexibility makes the model more adaptable in dealing with different weather and geographical conditions;

[0093] 3. Engineering practicability: The model of the present invention not only has theoretical value, but more importantly, it has been applied in engineering practice. It can provide strong support for arc fault detection, positioning and protection of outdoor distribution lines, and improve the safety and reliability of the power system.

[0094] like Figure 2 As shown, in one embodiment of the present invention, the above step S101 of establishing a first expression of arc heat per unit length under airflow interference specifically includes steps S201 to S203.

[0095] Step S201, obtain the fourth expression of arc heat per unit length and the fifth expression of heat capacity coefficient per unit volume of air, wherein the fourth expression describes the relationship between arc heat per unit length and heat capacity coefficient per unit volume of air, arc diameter and temperature, and the fifth expression describes the relationship between heat capacity coefficient per unit volume of air and temperature.

[0096] In the present invention, when an arc fault occurs in an empty distribution line, the arc will be affected by the wind speed, that is, the air moves relative to the arc at a speed v, and the arc diameter is approximately considered to be d arc The surrounding air will be heated from temperature T0 to the average arc temperature T1, and the arc heat per unit length P K for:

[0097]

[0098] Wherein, c is the heat capacity coefficient per unit volume of air, and T is the temperature. Formula (10) is the fourth expression.

[0099] According to the approximate relationship of temperature, the relationship between the unit volume heat capacity coefficient c of air and temperature T is expressed as:

[0100]

[0101] Wherein, k1 is an empirical constant, and the value thereof can be 0.41 as verified by experiments. Formula (11) is the fifth expression.

[0102] Step S202, substituting the fifth expression into the fourth expression to obtain a sixth expression of arc heat per unit length.

[0103] The present invention combines formula (10) and formula (11) to obtain:

[0104]

[0105] Formula (12) is the sixth expression.

[0106] Step S203, approximating the sixth expression in combination with experimental data to obtain the first expression.

[0107] Arc faults occur in open air. When air flows through, the arc is disturbed by the air. The relative air flow velocity v affects the convective transfer of heat, thereby changing the rate of heat dissipation. Since the arc is affected by wind speed, the air flows through the arc at a relative velocity v, resulting in the air being heated and the heat convection rate being related to v.

[0108] After research, the actual heat dissipation P Kmay be closer to the power relationship of speed v, so the formula (6) can be Part of it is replaced by the power relationship with v. Then through experiments, a more accurate fitting formula can be obtained, that is, P K Expressed as a function of speed v, the first expression above is obtained after fitting:

[0109]

[0110] In the formula, P K The unit is W / m, d arc The unit of is m, the unit of ν is m / s, k2 is a meteorological constant which is related to the meteorology and is 1 in normal weather.

[0111] In addition, the present invention also proposes a distribution network arc simulation method for a confined space scenario, which is used to improve the accuracy of distribution network arc simulation in a confined space scenario, provide strong support for distribution network grounding fault detection, positioning and protection in a confined space scenario, and help improve the safety and reliability of the power system. The specific examples are shown in the following embodiments.

[0112] Figure 3 is a third flow chart of the arc simulation method for distribution network according to an embodiment of the present invention, such as Figure 3 As shown, in one embodiment of the present invention, the distribution network arc simulation method of the present invention further includes step S301 and step S302.

[0113] Step S301, obtaining a cybernetics model transformed from the Mayr arc model.

[0114] Step S302: for a confined space scenario, use the cybernetics model to perform arc simulation on the distribution network.

[0115] In one embodiment of the present invention, the expression of the cybernetics model is:

[0116]

[0117] Where g is the instantaneous conductivity, t is the time, τ is the time characteristic, G is the static conductivity, i is the arc current, Vc is the field strength of the arc gap, I c is the characteristic current when the arc occurs, c is the arc length, and β is the coefficient.

[0118] In one embodiment of the present invention, V c =15V / cm, the coefficient β takes the empirical value of 2.85×10 - 5.I C Select according to system parameters, generally take the current when single-phase is grounded, unit kA.

[0119] In a confined space, arc faults occur in the distribution network, mainly concentrated in the cabinet. Since the temperature of the arc will get higher and higher during the burning process in a confined space, the arc tends to burn stably, which will cause serious safety accidents. In this scenario, it is more reasonable to use the control theory (arc) model to simulate the fault. Moreover, the control theory (arc) model is a function of the arc length. In a confined environment, the arc length can be considered to be approximately constant.

[0120] The advantages of using cybernetic models for simulation of confined space scenarios are as follows:

[0121] 1. Stability simulation: The cybernetic arc model can simulate the stable combustion process of the arc in a confined space, which is of great significance for predicting and evaluating the degree of damage caused by arc faults;

[0122] 2. Arc length constant assumption: In a closed environment, the arc length can be considered to be approximately constant. This assumption simplifies the complexity of the model while retaining the key features of the arc behavior, making the model more concise and easy to apply;

[0123] 3. Parameter adjustability: The parameters in the model (such as arc length, voltage gradient, coefficient, etc.) can be adjusted according to system parameters and experimental data to more accurately reflect the actual situation of the arc in the confined space;

[0124] 4. Safety assessment: By simulating the burning process of an arc in a confined space, the model can provide power system designers and operation and maintenance personnel with important information about the degree of hazard of arc faults, which helps to formulate effective safety protection measures.

[0125] 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.

[0126] Based on the same inventive concept, an embodiment of the present invention also provides a distribution network arc simulation device, which can be used to implement the distribution network arc simulation method described in the above embodiment, as described in the following embodiment. Since the principle of solving the problem by the distribution network arc simulation device is similar to that of the distribution network arc simulation method, the embodiment of the distribution network arc simulation device can refer to the embodiment of the distribution network arc simulation method, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0127] Figure 4is a first structural block diagram of the arc simulation device for a distribution network according to an embodiment of the present invention, such as Figure 4 As shown, in one embodiment of the present invention, the distribution network arc simulation device of the present invention includes:

[0128] An expression establishing unit 1 is used to establish a first expression for arc heat per unit length under airflow interference and a second expression for arc diameter under airflow interference, wherein the first expression describes the relationship between arc heat per unit length under airflow interference and wind speed, arc diameter and meteorological constants, and the second expression describes the relationship between arc diameter under airflow interference and arc current and wind speed;

[0129] The arc dissipation power expression determination unit 2 is used to substitute the second expression into the first expression, and then approximately solve to obtain a third expression of the arc dissipation power per unit length under airflow interference, wherein the third expression describes the relationship between the arc dissipation power per unit length under airflow interference and the arc current and wind speed;

[0130] An arc model improving unit 3, configured to improve the Mayr arc model based on the third expression to obtain an arc model for an outdoor open scene;

[0131] The outdoor open scene simulation unit 4 is used for performing arc simulation of the distribution network for the outdoor open scene by using the arc model for the outdoor open scene.

[0132] like Figure 5 As shown, in one embodiment of the present invention, the expression building unit 1 specifically includes:

[0133] An acquisition module 101 is used to acquire a fourth expression of arc heat per unit length and a fifth expression of heat capacity coefficient per unit volume of air, wherein the fourth expression describes the relationship between arc heat per unit length and heat capacity coefficient per unit volume of air, arc diameter and temperature, and the fifth expression describes the relationship between heat capacity coefficient per unit volume of air and temperature;

[0134] A calculation processing module 102, used for substituting the fifth expression into the fourth expression to obtain a sixth expression of arc heat per unit length;

[0135] The expression approximation processing module 103 is used to perform approximation processing on the sixth expression in combination with experimental data to obtain the first expression.

[0136] like Figure 6 As shown, in one embodiment of the present invention, the distribution network arc simulation device of the present invention further includes:

[0137] A cybernetic model acquisition unit 5, used for acquiring a cybernetic model transformed from a Mayr arc model;

[0138] The confined space scenario simulation unit 6 is used to use the cybernetics model to perform arc simulation on the distribution network for the confined space scenario.

[0139] In order to achieve the above object, according to another aspect of the present application, a computer device is also provided. Figure 7 As shown, the computer device includes a memory, a processor, a communication interface and a communication bus. A computer program that can be executed on the processor is stored in the memory. When the processor executes the computer program, the steps in the above-mentioned embodiment method are implemented.

[0140] The processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0141] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs and units, such as the corresponding program units in the above method embodiments of the present invention. The processor executes various functional applications of the processor and works data processing by running the non-transitory software programs, instructions and modules stored in the memory, that is, implementing the method in the above method embodiments.

[0142] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0143] The one or more units are stored in the memory, and when executed by the processor, the method in the above embodiment is performed.

[0144] The specific details of the above-mentioned computer device can be understood by referring to the corresponding related descriptions and effects in the above-mentioned embodiments, and will not be repeated here.

[0145] In order to achieve the above purpose, according to another aspect of the present application, a computer-readable storage medium is also provided, wherein the computer-readable storage medium stores a computer program, and the computer program implements the steps in the above-mentioned distribution network arc simulation method when executed in a computer processor. Those skilled in the art can understand that the implementation of all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and the program can include the processes of the embodiments of the above-mentioned methods when executed. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (Flash Memory), a hard disk (Hard Disk Drive, abbreviated as: HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0146] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a computer program product is also provided, including a computer program / instruction, which implements the steps of the above-mentioned distribution network arc simulation method when executed by a processor.

[0147] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0148] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distribution network arc simulation method, characterized in that: include: Establishing a first expression for arc heat per unit length under airflow interference and a second expression for arc diameter under airflow interference, wherein the first expression describes the relationship between arc heat per unit length under airflow interference and wind speed, arc diameter and meteorological constants, and the second expression describes the relationship between arc diameter under airflow interference and arc current and wind speed; Substituting the second expression into the first expression, and then approximately solving to obtain a third expression of arc dissipation power per unit length under airflow interference, wherein the third expression describes the relationship between the arc dissipation power per unit length under airflow interference and the arc current and wind speed; The Mayr arc model is improved based on the third expression to obtain an arc model for outdoor open scenes; For outdoor open scenes, the arc model for outdoor open scenes is used to simulate the arc in the distribution network.

2. The arc simulation method for distribution network according to claim 1, characterized in that: The first expression for establishing the arc heat per unit length under airflow interference includes: Obtaining a fourth expression of arc heat per unit length and a fifth expression of heat capacity coefficient per unit volume of air, wherein the fourth expression describes the relationship between arc heat per unit length and heat capacity coefficient per unit volume of air, arc diameter and temperature, and the fifth expression describes the relationship between heat capacity coefficient per unit volume of air and temperature; Substituting the fifth expression into the fourth expression, a sixth expression of arc heat per unit length is obtained; The sixth expression is approximated in combination with experimental data to obtain the first expression.

3. The distribution network arc simulation method according to claim 1 or 2, characterized in that: The first expression is: Among them, P K is the arc heat per unit length under airflow interference, k2 is the meteorological constant, d arc is the arc diameter and ν is the wind speed.

4. The arc simulation method for distribution network according to claim 1, characterized in that: The third expression is: Among them, P loss is the arc power dissipation per unit length under airflow disturbance, I is the arc current, and ν is the wind speed.

5. The arc simulation method for distribution network according to claim 1, characterized in that: Also includes: Obtain the cybernetics model transformed from the Mayr arc model; For the confined space scenario, the cybernetics model is used to simulate arc in the distribution network.

6. The arc simulation method for distribution network according to claim 5, characterized in that: The expression of the cybernetics model is: Among them, g is the instantaneous conductance, t is the time, τ is the time characteristic, G is the static conductance, i is the arc current, Vc is the field strength of the arc gap, Lc is the arc length, and β is the coefficient.

7. A distribution network arc simulation device, characterized in that: include: An expression establishing unit, used to establish a first expression for arc heat per unit length under airflow interference and a second expression for arc diameter under airflow interference, wherein the first expression describes the relationship between arc heat per unit length under airflow interference and wind speed, arc diameter and meteorological constants, and the second expression describes the relationship between arc diameter under airflow interference and arc current and wind speed; An arc dissipation power expression determination unit, used for substituting the second expression into the first expression, and then approximately solving to obtain a third expression of the arc dissipation power per unit length under airflow interference, wherein the third expression describes the relationship between the arc dissipation power per unit length under airflow interference and the arc current and wind speed; An arc model improvement unit, used for improving the Mayr arc model based on the third expression to obtain an arc model for an outdoor open scene; The outdoor open scene simulation unit is used for performing distribution network arc simulation for outdoor open scenes by using the arc model for outdoor open scenes.

8. The arc simulation device for distribution network according to claim 7, characterized in that: The expression building unit comprises: An acquisition module, used to acquire a fourth expression of arc heat per unit length and a fifth expression of heat capacity coefficient per unit volume of air, wherein the fourth expression describes the relationship between the arc heat per unit length and the heat capacity coefficient per unit volume of air, the arc diameter and the temperature, and the fifth expression describes the relationship between the heat capacity coefficient per unit volume of air and the temperature; A calculation processing module, used for substituting the fifth expression into the fourth expression to obtain a sixth expression of arc heat per unit length; An expression approximation processing module is used to perform approximation processing on the sixth expression in combination with experimental data to obtain the first expression.

9. The arc simulation device for distribution network according to claim 7, characterized in that: Also includes: A cybernetic model acquisition unit, used for acquiring a cybernetic model transformed from a Mayr arc model; The confined space scenario simulation unit is used to perform arc simulation of the distribution network using the cybernetics model for confined space scenarios.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

11. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

12. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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