Boundary condition setting method for enhancing simulation initial stability and related device

Abstract

The invention discloses a boundary condition setting method for enhancing simulation initial stability and a related device, and the method comprises the steps: carrying out the arc starting through an actual current instead of adding a transition current when the actual arc starting current is smaller than 4kA, and guaranteeing the stability of initial solution; when the arcing current is 4 kA or above, due to the fact that the initial current area in the model is wide, the problem that numerical values are unstable or not converged easily occurs when parameters in the model are calculated, and therefore transition small current is added before the actual current is led in. According to the method, the transition time is designed to be increased according to different working conditions of the arc starting current, so that the simulation calculation stability is ensured. Meanwhile, it is also ensured that the combustion rule is consistent with the actual arc combustion rule in the circuit breaker. An effective mathematical simulation model is provided for improving the performance of the high-voltage circuit breaker, and powerful support is provided for improving the reliability of a power system.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage circuit breakers, and in particular to a boundary condition setting method and related devices for enhancing initial stability of simulation. Background Art

[0002] In power systems, high-voltage circuit breakers are often used to handle circuit protection under high current and high load conditions. In recent years, with the continuous advancement of research and development technology, high-voltage circuit breakers have gradually acquired stronger breaking capacity and higher reliability. Modern high-voltage circuit breakers use advanced arc extinguishing technologies, such as gas-insulated circuit breakers and vacuum circuit breakers, which enable circuit breakers to quickly and effectively cut off current at higher current levels, thereby protecting power systems from overload and short-circuit faults. With the expansion of the scale of power systems and the increase in requirements for safety and stability, the design and manufacturing technology of high-voltage circuit breakers with a current level of 80kA and above is also constantly upgrading to ensure that they can operate stably and provide reliable protection under various harsh conditions.

[0003] Finite element simulation calculation plays a key role in improving the performance of high-voltage circuit breakers. In research, finite element simulation is often used to model and analyze the electromagnetic, thermal and mechanical characteristics of circuit breakers in detail, so as to provide ideas for optimizing the structure of circuit breakers. The type test of circuit breakers is carried out under three working conditions: short arc, medium arc and long arc. Therefore, the arc burning trend under these three working conditions should also be simulated during the simulation process. The three working conditions are handled differently in the simulation: for short arc and long arc conditions, the arc is generally started at the minimum current; for medium arc conditions, the arc is usually started near the peak value.

[0004] At present, there are still some shortcomings in the finite element simulation calculation for the medium arcing conditions above 80kA current level. For example, the arc behavior is very complex under high current, which makes it difficult to establish a very accurate physical model; the accuracy and stability of the model calculation results depend on the initial data and boundary conditions. If the initial solution results are unstable, it will hinder the smooth progress of the simulation. Under some conditions, if the arc starting current is too large, the initial current set in the circuit breaker is large, which will lead to poor stability of the initial solution, thereby reducing the efficiency and accuracy of the simulation solution. Therefore, in order to enhance the stability of the breaking arc plasma simulation under the medium arcing conditions above 80kA current level, it is urgent to design a boundary condition setting method that enhances the initial stability of the simulation. Summary of the invention

[0005] The present application provides a boundary condition setting method and related devices for enhancing the initial stability of simulation, which are used to enhance the stability of arc-breaking plasma simulation under arcing conditions above 80kA current level.

[0006] In view of this, the first aspect of the present application provides a method for setting boundary conditions for enhancing initial stability of simulation, the method comprising:

[0007] The scenarios of applying small current are divided into several types according to the arc starting current, including: when the absolute value of the arc starting current is less than 4kA, and when the absolute value of the arc starting current is greater than 4kA;

[0008] When the absolute value of the arc starting current is less than 4 kA, the arc is started by the actual current without applying a small transition current;

[0009] When the absolute value of the arc starting current is greater than 4 kA, the applied current value and the corresponding transition time value are determined according to the current level.

[0010] Optionally, when the absolute value of the arc starting current is greater than 4 kA, determining the applied current value and the corresponding transition time value according to the current level includes:

[0011] When the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, empirical data of transition time under multiple current levels are obtained, and the empirical data are fitted to derive a first fitting formula, and the values ​​of the transition time from small current to large current under different current levels are obtained through the first fitting formula;

[0012] When the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, empirical data of the transition time under multiple current levels are obtained, and the empirical data are fitted to derive a second fitting formula. Through the second fitting formula, the numerical value of the transition time from small current to large current under different current levels is obtained.

[0013] Optionally, the first fitting formula is:

[0014] ;

[0015] In the formula, For transition time, is the arc starting current.

[0016] Optionally, the second fitting formula is:

[0017] ;

[0018] In the formula, For transition time, is the arc starting current.

[0019] A second aspect of the present application provides a boundary condition setting system for enhancing initial stability of simulation, the system comprising:

[0020] A division unit is used to divide the situation of applying a small current into several situations according to the arc starting current, including: when the absolute value of the arc starting current is less than 4kA, and when the absolute value of the arc starting current is greater than 4kA;

[0021] A first setting unit is used to start the arc by using the actual current and not applying a small transition current when the absolute value of the arc starting current is less than 4 kA;

[0022] The second setting unit is used to determine the applied current value and the corresponding transition time value according to the current level when the absolute value of the arc starting current is greater than 4kA.

[0023] Optionally, the second setting unit includes:

[0024] A first setting subunit is used for obtaining empirical data of transition time under multiple current levels when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, and fitting the empirical data to derive a first fitting formula, and obtaining the numerical value of the transition time from a small current to a large current under different current levels through the first fitting formula;

[0025] The second setting subunit is used to obtain empirical data of transition time under multiple current levels when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, and fit the empirical data to derive a second fitting formula. Through the second fitting formula, the numerical value of the transition time from small current to large current at different current levels is obtained.

[0026] Optionally, the first fitting formula is:

[0027] ;

[0028] In the formula, For transition time, is the arc starting current.

[0029] Optionally, the second fitting formula is:

[0030] ;

[0031] In the formula, For transition time, is the arc starting current.

[0032] A third aspect of the present application provides a boundary condition setting device for enhancing initial stability of simulation, the device comprising a processor and a memory:

[0033] The memory is used to store program code and transmit the program code to the processor;

[0034] The processor is used to execute the steps of the boundary condition setting method for enhancing the initial stability of simulation as described in the first aspect according to the instructions in the program code.

[0035] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the boundary condition setting method for enhancing the initial stability of simulation described in the first aspect above.

[0036] It can be seen from the above technical solutions that this application has the following advantages:

[0037] The present application provides a method for setting boundary conditions to enhance the initial stability of simulation. For different arc starting current conditions, the transition time is increased to ensure the stability of simulation calculation. At the same time, it is also guaranteed to be consistent with the actual arc burning law in the circuit breaker. The present application provides an effective mathematical simulation model for improving the performance of high-voltage circuit breakers and provides strong support for improving the reliability of power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic flow chart of a method for setting boundary conditions for enhancing initial stability of simulation provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of the structure of a boundary condition setting system for enhancing the initial stability of a simulation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] 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 are within the scope of protection of this application.

[0041] Terminology explanation:

[0042] Circuit breaker: A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use.

[0043] Medium arcing condition: Medium arcing time refers to the duration of arcing of the circuit breaker under medium load or medium fault conditions. Usually, this period is determined by the shortest arcing time of the circuit breaker, which is between the short arcing time and the long arcing time. This length of time has a significant impact on the performance of the circuit breaker and its ability to protect the circuit.

[0044] Electric arc: Electric arc is a gas discharge phenomenon, which is an instantaneous spark produced by current passing through some insulating medium (such as air). When the circuit is interrupted in the atmosphere, as long as the voltage exceeds 12-20V and the interrupted current exceeds 0.25-1A, a ball of extremely high temperature, strong light and conductive cylindrical gas is usually generated in the contact gap (also called arc gap). This is the electric arc. Electric arc is a gas discharge phenomenon and also a plasma.

[0045] Plasma: Plasma is the fourth state of matter, along with solid, liquid, and gas. With 50,000K as the boundary, plasma can be divided into two categories: high-temperature plasma and low-temperature plasma. Arc belongs to the latter.

[0046] Finite element simulation: Finite element simulation refers to a method of solving complex problems by simplifying them into simpler ones. It regards the solution area as consisting of many small interconnected sub-areas called finite elements. For each finite element, a suitable approximate solution is assumed, and then a solution that satisfies the conditions of the entire area is derived.

[0047] Initial solution stability: Initial solution stability refers to the stability of the initial solution when solving a problem in areas such as mathematical optimization, computational science, or control systems. This usually involves the following aspects: initial solution stability, numerical stability, and algorithm convergence. Initial solution stability is an important indicator for evaluating the robustness and reliability of the initial solution, ensuring that the system can effectively cope with initial conditions and disturbances during the calculation or control process.

[0048] Arc starting current: Arc starting current refers to the current at the point where the contacts and fingers just separate during the circuit breaker opening process.

[0049] See also Figure 1 A method for setting boundary conditions for enhancing initial stability of simulation provided in an embodiment of the present application includes:

[0050] Step 101 : Divide the situation of applying a small current into several situations according to the arc starting current, including: when the absolute value of the arc starting current is less than 4 kA, and when the absolute value of the arc starting current is greater than 4 kA.

[0051] It should be noted that, according to the size of the arc starting current, the situation of applying a small current is divided into when the absolute value of the arc starting current is less than 4 kA and when the absolute value of the arc starting current is greater than 4 kA.

[0052] Further, in one embodiment, when the absolute value of the arc-starting current is greater than 4kA, it also includes: when the absolute value of the arc-starting current is greater than 4kA and the arc is started after the peak value, and when the absolute value of the arc-starting current is greater than 4kA and the arc is started before the peak value.

[0053] Step 102: When the absolute value of the arc starting current is less than 4 kA, the arc is started by the actual current without applying a small transition current.

[0054] It should be noted that when the absolute value of the arcing current is less than 4kA, the arcing current in the circuit breaker is small. When the finite element method is used for simulation, the current region set in the initial situation is relatively narrow, and the stable state can be reached relatively quickly during calculation and iteration, and it is consistent with the arcing situation under actual working conditions. Therefore, when the absolute value of the current at the moment of arcing is below 4kA, the arcing can be directly started by the actual current, without adding a small transition current, which can meet the stability and accuracy required for the simulation.

[0055] Step 103: When the absolute value of the arc starting current is greater than 4 kA, the applied current value and the corresponding transition time value are determined according to the current level.

[0056] It should be noted that when the arc starting current is 4kA or above, the initial current region in the model is relatively wide, and numerical instability or non-convergence problems are prone to occur when calculating the parameters in the model. Therefore, a small transition current should be added before the actual current is introduced. Please see the following description for details.

[0057] In one embodiment, step 103 includes:

[0058] Step 1031, when the absolute value of the arc starting current is greater than 4kA, and the arc starts after the peak value, obtain empirical data of the transition time under multiple current levels, and fit the empirical data to derive a first fitting formula. Through the first fitting formula, the numerical value of the transition time from small current to large current at different current levels is obtained.

[0059] Among them, the first fitting formula is:

[0060] ;

[0061] In the formula, For transition time, is the arc starting current.

[0062] It should be noted that when the absolute value of the arc starting current is above 4kA, the current region in the initial model is relatively wide. If the arc is started directly from the original current, it is difficult to ensure the stability of the initial solution in the simulation calculation. At this time, it is necessary to set a transition current so that the current gradually rises to the arc starting current value within a certain transition time. The working conditions targeted by this application are all working currents with a frequency of 50Hz.

[0063] This application summarizes the influence of different arc starting currents on the solution stability and fits the obtained empirical data to derive the corresponding fitting formula. The fitting formula can be used to obtain the value of the transition time from small current to large current at different current levels. The formula for the relationship between the transition time (in milliseconds) and the arc starting current (in kiloamperes) is as shown in the first fitting formula above.

[0064] Through the analysis of the first fitting formula, the following conclusions can be drawn: In the mapping relationship involved in this application, the increase in arc starting current does not cause a monotonic increase in the transition time, but presents a nonlinear trend that changes with the current level. Specifically, in the current level range of 50-100kA, the transition time increases with the increase of current; however, when the current level reaches 100-150kA, the transition time is shortened; when the current level exceeds 150kA, the transition time increases significantly. This rule is consistent with the calculation stability requirements in the simulation process, indicating that when the arc starting current level increases, the transition time needs to be appropriately extended or shortened to ensure the smooth progress of the iteration process and the accuracy of the simulation results.

[0065] Step 1032, when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, obtain empirical data of the transition time under multiple current levels, and fit the empirical data to derive a second fitting formula. Through the second fitting formula, the numerical value of the transition time from small current to large current at different current levels is obtained.

[0066] Among them, the second fitting formula is:

[0067] ;

[0068] In the formula, For transition time, is the arc starting current.

[0069] It should be noted that this situation (when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value) is similar to the previous one (when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value). Since the actual arc starting current is large and the current value gradually increases after the arc starting, the actual current cannot be used directly to start the arc in the simulation, but a small current transition is used. Similar to the method in the previous case, the empirical data of the transition time under multiple current levels are first used, and then the data is fitted to obtain the fitting formula such as the second fitting formula mentioned above.

[0070] It can be seen from the above second fitting formula that when the arc starting current level is below 250 kA, the transition time increases with the increase of the arc starting current.

[0071] In summary, when the absolute value of the actual arc starting current is less than 4kA, since the initial arc starting area is relatively narrow, the stability during the simulation calculation process is better, so there is no need to set the transition current. However, when the absolute value of the actual arc starting current reaches or exceeds 4kA, directly setting a wider initial arc starting area may cause a large residual in the initial calculation iteration process, thereby affecting the feasibility of the calculation. At this time, it is necessary to set a certain transition time so that the current gradually transitions from small to large to ensure that the simulation process can proceed smoothly while maintaining a high degree of consistency with the actual arc plasma combustion conditions. The method of the present application is to obtain a fitting curve by fitting empirical data under multiple known current levels, thereby providing a reliable reference basis for researchers to reasonably set the transition time under different current levels.

[0072] The present application provides a method for setting boundary conditions to enhance the initial stability of the simulation, which mainly focuses on how to apply a small current in different situations during the simulation process, and determine the transition time from small current to large current based on the arc starting current, current frequency and arcing time. The selection of the transition time must not only meet the stability of the initial solution in the simulation, but also conform to the actual law of the arcing process. The present application specifically includes the precise determination of the transition time based on parameters such as the arc current size, current frequency and arcing time in different situations, so as to ensure that the current transition during the simulation process is reasonable and accurate, and the simulation situation is highly consistent with the actual working conditions.

[0073] The above is a method for setting boundary conditions for enhancing the initial stability of simulation provided in an embodiment of the present application, and the following is a system for setting boundary conditions for enhancing the initial stability of simulation provided in an embodiment of the present application.

[0074] See also Figure 2 , a boundary condition setting system for enhancing initial stability of simulation provided in an embodiment of the present application includes:

[0075] The division unit 201 is used to divide the situation of applying a small current into several situations according to the arc starting current, including: when the absolute value of the arc starting current is less than 4kA, and when the absolute value of the arc starting current is greater than 4kA.

[0076] The first setting unit 202 is used to start the arc by using the actual current without applying a small transition current when the absolute value of the arc starting current is less than 4 kA.

[0077] The second setting unit 203 is used to determine the applied current value and the corresponding transition time value according to the current level when the absolute value of the arc starting current is greater than 4kA.

[0078] In one embodiment, the second setting unit 203 includes:

[0079] The first setting subunit 2031 is used to obtain empirical data of transition time under multiple current levels when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, and to fit the empirical data to derive a first fitting formula. Through the first fitting formula, the numerical value of the transition time from a small current to a large current at different current levels is obtained.

[0080] Among them, the first fitting formula is:

[0081] ;

[0082] In the formula, For transition time, is the arc starting current.

[0083] The second setting subunit 2032 is used to obtain empirical data of transition time under multiple current levels when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, and to fit the empirical data to derive a second fitting formula. Through the second fitting formula, the numerical value of the transition time from small current to large current at different current levels is obtained.

[0084] Among them, the second fitting formula is:

[0085] ;

[0086] In the formula, For transition time, is the arc starting current.

[0087] Furthermore, an embodiment of the present application also provides a boundary condition setting device for enhancing the initial stability of a simulation, the device comprising a processor and a memory:

[0088] The memory is used to store program code and transmit the program code to the processor;

[0089] The processor is used to execute the steps of the boundary condition setting method for enhancing the initial stability of simulation as described in the above method embodiment according to the instructions in the program code.

[0090] Furthermore, a computer-readable storage medium is provided in an embodiment of the present application, and the computer-readable storage medium is used to store program code, and the program code is used to execute the boundary condition setting method for enhancing the initial stability of simulation described in the above method embodiment.

[0091] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0092] The terms "first", "second", "third", "fourth", etc. (if any) in the specification 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, for example. 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 that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0093] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0094] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0095] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0096] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0097] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0098] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for setting boundary conditions to enhance initial stability of simulation, characterized in that: include: The scenarios of applying small current are divided into several types according to the arc starting current, including: when the absolute value of the arc starting current is less than 4kA, and when the absolute value of the arc starting current is greater than 4kA; When the absolute value of the arc starting current is less than 4 kA, the arc is started by the actual current without applying a small transition current; When the absolute value of the arc starting current is greater than 4 kA, the applied current value and the corresponding transition time value are determined according to the current level.

2. The method for setting boundary conditions for enhancing initial stability of simulation according to claim 1, characterized in that: When the absolute value of the arc starting current is greater than 4 kA, the applied current value and the corresponding transition time value are determined according to the current level, including: When the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, empirical data of transition time under multiple current levels are obtained, and the empirical data are fitted to derive a first fitting formula, and the values ​​of the transition time from small current to large current under different current levels are obtained through the first fitting formula; When the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, empirical data of the transition time under multiple current levels are obtained, and the empirical data are fitted to derive a second fitting formula. Through the second fitting formula, the numerical value of the transition time from small current to large current under different current levels is obtained.

3. The method for setting boundary conditions for enhancing initial stability of simulation according to claim 2, characterized in that: The first fitting formula is: ； In the formula, For transition time, is the arc starting current.

4. The method for setting boundary conditions for enhancing initial stability of simulation according to claim 2, characterized in that: The second fitting formula is: ； In the formula, For transition time, is the arc starting current.

5. A boundary condition setting system for enhancing the initial stability of simulation, characterized in that: include: A division unit is used to divide the situation of applying a small current into several situations according to the arc starting current, including: when the absolute value of the arc starting current is less than 4kA, and when the absolute value of the arc starting current is greater than 4kA; A first setting unit is used to start the arc by using the actual current and not applying a small transition current when the absolute value of the arc starting current is less than 4 kA; The second setting unit is used to determine the applied current value and the corresponding transition time value according to the current level when the absolute value of the arc starting current is greater than 4kA.

6. The boundary condition setting system for enhancing the initial stability of simulation according to claim 5, characterized in that: The second setting unit includes: A first setting subunit is used for obtaining empirical data of transition time under multiple current levels when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, and fitting the empirical data to derive a first fitting formula, and obtaining the numerical value of the transition time from a small current to a large current under different current levels through the first fitting formula; The second setting subunit is used to obtain empirical data of transition time under multiple current levels when the absolute value of the arc starting current is greater than 4kA and the arc starts after the peak value, and fit the empirical data to derive a second fitting formula. Through the second fitting formula, the numerical value of the transition time from small current to large current at different current levels is obtained.

7. The boundary condition setting system for enhancing initial stability of simulation according to claim 6, characterized in that: The first fitting formula is: ； In the formula, For transition time, is the arc starting current.

8. The boundary condition setting system for enhancing initial stability of simulation according to claim 6, characterized in that: The second fitting formula is: ； In the formula, For transition time, is the arc starting current.

9. A boundary condition setting device for enhancing the initial stability of simulation, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the boundary condition setting method for enhancing the initial stability of simulation according to any one of claims 1-4 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program codes, and the program codes are used to execute the boundary condition setting method for enhancing the initial stability of simulation as described in any one of claims 1-4.

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