Simulation method, system and device considering circuit breaker closing pre-breakdown characteristics

Abstract

The application provides a simulation method, system and device considering the closing pre-breakdown characteristics of a circuit breaker, and belongs to the technical field of SF6 circuit breaker simulation. The method comprises the following steps: S1, establishing an SF6 circuit breaker controlled element model in simulation software, wherein the controlled element model comprises the relationship between the closing state in the closing process of the circuit breaker and the SF6 gas parameters, and the relationship between the SF6 circuit breaker gap voltage; and the relationship between the arc resistance value in the closing process of the circuit breaker and the arc parameters, the SF6 circuit breaker gap voltage, and the passing current of the SF6 circuit breaker; S2, building an SF6 circuit breaker test circuit simulating a power system and connecting the SF6 circuit breaker controlled element model to the SF6 circuit breaker test circuit; and S3, loading the SF6 gas parameters and the arc parameters, adjusting the real-time gap voltage and the real-time passing current, and performing the system electromagnetic transient process simulation of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit.

Description

Technical Field

[0001] This invention relates to the field of SF6 circuit breaker simulation technology, and in particular to a simulation method, system and equipment that considers the pre-breakdown characteristics of circuit breaker closing. Background Technology

[0002] SF6 circuit breakers, with their advantages of high breaking capacity, long electrical life, and high insulation level, are crucial components in the power grid and significantly impact its operational reliability. In actual power system operation, SF6 circuit breakers frequently operate in scenarios such as capacitor bank switching. The large inrush current during closing can cause severe erosion of the circuit breaker's arc contacts, leading to surface roughness, cracks, and the accumulation of metal particles on the nozzle surface. This can even cause arc contact deformation, making the contacts sharper, severely affecting the electric field distribution within the arc-extinguishing chamber, increasing the probability of reignition during the breaking process, generating operational overvoltages, damaging the insulation performance of the circuit breaker and adjacent equipment, and significantly reducing the electrical life of the switch. Therefore, it is necessary to study the pre-breakdown process of SF6 circuit breakers during closing.

[0003] Research on the pre-breakdown during closing of SF6 circuit breakers generally employs two methods: simulation and experimentation. Compared to experimental methods, simulation studies of circuit breakers can reduce experimental costs and the randomness of testing, thus offering certain economic advantages. However, existing simulation software uses relatively simple modeling methods for SF6 circuit breakers, only superficially representing changes in the circuit breaker's opening and closing states, without considering the changes in arc resistance during the closing process, resulting in low simulation accuracy. Summary of the Invention

[0004] In view of this, the present invention provides a simulation method, system and equipment that considers the pre-breakdown characteristics of circuit breakers during closing, taking into account the dynamic changes in arc resistance during the pre-breakdown process of SF6 circuit breakers, thereby improving the simulation accuracy of SF6 circuit breakers simulating actual working conditions.

[0005] The technical solution adopted by the embodiments of the present invention to solve its technical problem is as follows:

[0006] A simulation method considering the pre-breakdown characteristics of circuit breaker closing is provided, including:

[0007] Step S1: Establish a controlled component model of the SF6 circuit breaker in the simulation software. The controlled component model includes the relationship between the closing state and SF6 gas parameters during the circuit breaker closing process, as well as the relationship between the arc resistance value and arc parameters, the SF6 circuit breaker breaking voltage, and the current flowing through the SF6 circuit breaker during the circuit breaker closing process.

[0008] Step S2: Build an SF6 circuit breaker test circuit to simulate a power system and connect the SF6 circuit breaker controlled element model to the SF6 circuit breaker test circuit.

[0009] Step S3: Load the SF6 gas parameters and the arc parameters, adjust the real-time voltage and real-time current of the break point, and simulate the electromagnetic transient process of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit.

[0010] Preferably, the SF6 gas parameters include the SF6 gas calculation coefficient b and the SF6 gas density ρ, the closing state during circuit breaker closing is related to the SF6 gas parameters, and the SF6 circuit breaker disconnect voltage U. SF6 The relationship between them is:

[0011] When U SF6 When <U, the SF6 circuit breaker did not experience pre-breakdown during closing, where U is the real-time insulation strength of the SF6 circuit breaker;

[0012] When U SF6 When the voltage is ≥U, the SF6 circuit breaker experiences a pre-breakdown during closing, resulting in an arc.

[0013] U = TRV - at

[0014] a = TRV / t end

[0015] TRV=bρD max

[0016] Where TRV is the maximum value that the circuit breaker insulation strength can withstand, a is a calculation coefficient, and t is the duration of the circuit breaker contact closing action. end D is the time required for the closing action to complete. max This refers to the maximum contact opening distance of the SF6 circuit breaker.

[0017] Preferably, the relationship between the arc resistance value and the arc parameters, the SF6 circuit breaker break voltage, and the SF6 circuit breaker current during circuit breaker closing is as follows:

[0018] When the SF6 circuit breaker does not experience pre-breakdown during closing, the arc resistance is equivalent to a large resistance.

[0019] When the SF6 circuit breaker experiences a pre-breakdown during closing, an electric arc is generated. The arc resistance is calculated as follows:

[0020]

[0021] Where ω(i) is the arc weighting function, R c R is the arc resistance of the Cassie model.m For the arc resistance in the Mayr model;

[0022]

[0023]

[0024] Where τ is the arc time constant, E is the steady arc voltage, P0 is the arc power, u is the circuit breaker voltage, and i is the circuit breaker current.

[0025] The expression for the arc weight function ω(i) is:

[0026]

[0027] Where i0 is the transition current and k is the transition coefficient.

[0028] This invention provides a simulation system considering the pre-breakdown characteristics of SF6 circuit breakers during closing, comprising:

[0029] The component model establishment module is used to establish a controlled component model of the SF6 circuit breaker in the simulation software. The controlled component model includes the relationship between the closing state and SF6 gas parameters during the circuit breaker closing process, as well as the relationship between the arc resistance value and arc parameters, the SF6 circuit breaker break voltage, and the current flowing through the SF6 circuit breaker during the circuit breaker closing process.

[0030] The circuit model building module is used to build an SF6 circuit breaker test circuit that simulates a power system and connect the controlled component model of the SF6 circuit breaker to the SF6 circuit breaker test circuit.

[0031] The simulation module is used to load the SF6 gas parameters and the arc parameters, adjust the real-time voltage and real-time current of the break point, and simulate the electromagnetic transient process of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit.

[0032] The present invention provides an electronic device, 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 the one or more processors, the one or more processors cause the one or more processors to implement the aforementioned method.

[0033] The present invention provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the aforementioned method.

[0034] The present invention provides a computer program product, the computer program product comprising a computer program, which, when executed by a processor, is used to implement the aforementioned method.

[0035] As can be seen from the above technical solution, the simulation method and system considering the pre-breakdown characteristics of circuit breaker closing provided by the embodiments of the present invention first establishes a controlled component model of the SF6 circuit breaker in simulation software. The controlled component model includes the relationship between the closing state and SF6 gas parameters during the circuit breaker closing process, as well as the relationship between the arc resistance value and arc parameters, SF6 circuit breaker break voltage, and SF6 circuit breaker current during the circuit breaker closing process. Next, an SF6 circuit breaker test circuit simulating a power system is built, and the controlled component model of the SF6 circuit breaker is connected to the SF6 circuit breaker test circuit. Finally, the SF6 gas parameters and arc parameters are loaded, and the real-time break voltage and real-time current are adjusted to simulate the electromagnetic transient process of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit. The simulation method of the present invention considers the dynamic change of arc resistance during the SF6 circuit breaker closing pre-breakdown process, which can improve the simulation accuracy of SF6 circuit breakers simulating actual operating conditions. Attached Figure Description

[0036] Figure 1 A flowchart of a simulation method that takes into account the pre-breakdown characteristics of circuit breaker closing.

[0037] Figure 2 This is a schematic diagram of a custom SF6 circuit breaker controlled component model.

[0038] Figure 3 A flowchart for programming control of the circuit resistance of an SF6 circuit breaker.

[0039] Figure 4 This is a simulation circuit diagram used in the embodiment.

[0040] Figure 5 The waveforms of the break voltage and dielectric strength when pre-breakdown occurs are shown in the example.

[0041] Figure 6 The waveform of the arc voltage during the pre-breakdown of the SF6 circuit breaker in the embodiment is shown.

[0042] Figure 7 A block diagram of an electronic device used to perform simulation operations.

[0043] Figure 8 The simulation system structure diagram takes into account the pre-breakdown characteristics of the circuit breaker closing. Detailed Implementation

[0044] The technical solution and effects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] like Figure 1 As shown, this invention provides a simulation method considering the pre-breakdown characteristics of circuit breaker closing, comprising:

[0046] Step S1: Establish a controlled component model of the SF6 circuit breaker in the simulation software. The controlled component model includes the relationship between the closing state and SF6 gas parameters and the voltage of the SF6 circuit breaker during the circuit breaker closing process. It also includes the relationship between the arc resistance value and arc parameters, the voltage of the SF6 circuit breaker at the break point, and the current flowing through the SF6 circuit breaker during the circuit breaker closing process.

[0047] Step S2: Construct an SF6 circuit breaker test circuit simulating a power system and connect the controlled component model of the SF6 circuit breaker to the SF6 circuit breaker test circuit. The test circuit is as follows: Figure 4 As shown, the connection sequence is as follows: AC power supply, AC power supply impedance, circuit breaker controlled element model, parallel capacitor, and series reactor. A discharge coil TV is connected in parallel to the parallel capacitor, and the two ends of the test circuit are grounded. The test procedure is as follows: Figure 3 As shown;

[0048] Step S3: Load SF6 gas parameters and arc parameters, adjust the real-time voltage and current through the break point, and simulate the electromagnetic transient process of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit.

[0049] In step S1, the controlled element model of the SF6 circuit breaker is as follows: Figure 2 As shown, the opening and closing states of the SF6 circuit breaker are controlled by the SF6 circuit breaker state control program, which is called using simulation software and an external programming language interface. The control of the SF6 circuit breaker's closing state is based on the comparison between the break voltage and the dielectric strength between the contacts. After the closing command is issued, if the circuit breaker break voltage is less than the dielectric strength between the contacts, no pre-breakdown occurs; as the dielectric strength between the contacts decreases, if the break voltage is greater than the dielectric strength, pre-breakdown occurs; when the circuit breaker is fully closed, the arc is extinguished. The dielectric strength between the SF6 circuit breaker contacts is programmed based on the following analysis:

[0050] When a circuit breaker closes, the contacts move towards each other at high speed, and the dielectric strength between the contacts decreases accordingly. Once the voltage across the contacts exceeds the insulation strength, the dielectric will break down and an arc will occur. Therefore, the dielectric strength between the contacts of an SF6 circuit breaker is an important parameter for analyzing the pre-breakdown process during circuit breaker closing. During circuit breaker closing, the dielectric strength between the contacts decreases as the distance between them decreases; the relationship between the two is basically linear, and therefore can be approximated as a linear equation for calculation.

[0051] U = TRV - at (1)

[0052] a = TRV / t end (2)

[0053] Where U is the real-time insulation strength of the SF6 circuit breaker, TRV is the maximum value that the circuit breaker's insulation strength can withstand, i.e., the dielectric strength at the maximum closing distance, a is a calculation coefficient, and t is the duration of the circuit breaker's contact closing action. end This is the time required for the closing action to complete;

[0054] For SF6 circuit breakers, the breakdown process of SF6 gas can be explained using the streamer theory. According to the streamer theory, the dielectric strength of the entire arc gap is calculated based on the weakest point of the dielectric. Therefore, we can obtain:

[0055] TRV=bρD max (3)

[0056] Among them, D max ρ is the maximum contact spacing of the SF6 circuit breaker, b is the SF6 gas calculation coefficient, and ρ is the SF6 gas density.

[0057] When U SF6 When <U, the SF6 circuit breaker did not experience pre-breakdown during closing;

[0058] When U SF6 When the voltage is ≥U, the SF6 circuit breaker experiences pre-breakdown during closing, resulting in arcing.

[0059] In summary, by inputting the SF6 gas parameters b and ρ, and combining them with the real-time voltage at the circuit breaker contacts, the closing state of the SF6 circuit breaker can be controlled. In this embodiment, b is set to 1.167, and ρ is set to 32.2 kg / mm². 3 .

[0060] In step S1, the opening and closing state of the SF6 circuit breaker is controlled by the arc resistance control program. The arc resistance during the pre-breakdown process of the SF6 circuit breaker closing is dynamically changing. When no pre-breakdown occurs, the circuit is open, and the arc resistance is equivalent to a large resistance, which is set to 10MΩ in this embodiment; when the circuit breaker closes, the arc is extinguished, and the arc resistance is equivalent to zero; when pre-breakdown occurs, the arc burns, and the arc resistance can be calculated using the following formula:

[0061]

[0062] Where ω(i) is the arc weighting function, R c R is the arc resistance of the Cassie model. m For the arc resistance in the Mayr model;

[0063] R c The expression satisfies:

[0064]

[0065] R m The expression satisfies:

[0066]

[0067] Where τ is the arc time constant, E is the steady arc voltage (preset value), P0 is the arc power dissipation (preset value), and u is the circuit breaker voltage, which is equivalent to the aforementioned break voltage U in the simulation. SF6 i is the current flowing through the circuit breaker;

[0068] The expression for the arc weight function ω(i) is:

[0069]

[0070] Where i0 is the transition current, which is an adjustable parameter in the simulation process; k is the transition coefficient.

[0071] As shown in the above expressions, after presetting the arc time constant τ, stable arc voltage E, and arc discharge power P0, the arc input parameters i0 and k can be changed in the simulation. Combined with the real-time voltage u and current i at the circuit breaker opening, the arc resistance during the pre-breakdown of the circuit breaker can be adjusted. In this embodiment, i0 is taken as 0.063kA, and k is taken as 2.

[0072] A custom controlled element model of an SF6 circuit breaker is established in the simulation software. The program written in steps 1 and 2 is called through the interface between the simulation software and an external programming language. The resistance value of the element connected to the circuit is controlled by the input SF6 gas parameters, arc parameters, and the voltage and current of the element. The inductance and capacitance of the SF6 circuit breaker model are determined by the actual parameters of the simulated circuit breaker. In this embodiment, L = 0.01mH and C = 100pF.

[0073] In the simulation software, the SF6 circuit breaker model established in step 3 is connected to the circuit for electromagnetic transient simulation. This embodiment simulates the connection of a capacitor; the circuit diagram is shown below. Figure 4 As shown. When the closing phase angle is 40°, the circuit breaker sends a closing signal. The waveforms of the circuit breaker's break voltage and current are observed using the software's measuring elements. When the break voltage phase angle is 90°, the voltage exceeds the dielectric strength between the breaks, resulting in pre-breakdown, as shown. Figure 5 As shown in the figure. The arc voltage waveform during the pre-breakdown of the SF6 circuit breaker during closing is as follows. Figure 6 As shown.

[0074] This invention discloses a simulation method considering the pre-breakdown characteristics of SF6 circuit breakers during closing. It involves programming to control the changes in SF6 dielectric strength and arcing between the contacts during the SF6 circuit breaker's closing process, and establishing a custom SF6 circuit breaker model in simulation software. This model can call the programmed code, and after inputting SF6 gas parameters and arcing parameters, it combines real-time voltage and current data from the circuit breaker's contact points to control the resistance value of the SF6 circuit breaker connected to the circuit for simulation. The SF6 circuit breaker simulation model established by this invention takes into account the transient process of SF6 circuit breaker pre-breakdown during closing, making the simulation results of SF6 circuit breaker closing more accurate.

[0075] This invention establishes a dynamic arc model for the pre-breakdown process of SF6 circuit breaker closing, which can simulate the complex arc combustion process and explore its impact on the closing transient of SF6 circuit breaker, making the circuit breaker model more consistent with actual engineering conditions. It can be simulated using conventional power system simulation software and can be controlled by programming, which can save investment in simulation systems, has high flexibility and strong compatibility, and better simulates the actual pre-breakdown transient process of SF6 circuit breaker closing.

[0076] like Figure 8 As shown, the simulation system considering the pre-breakdown characteristics of SF6 circuit breakers includes component model building module 21, circuit model building module 22, and simulation module 23.

[0077] The component model establishment module 21 is used to establish the controlled component model of the SF6 circuit breaker in the simulation software. The controlled component model includes the relationship between the closing state and SF6 gas parameters during the circuit breaker closing process, as well as the relationship between the arc resistance value and arc parameters, the SF6 circuit breaker break voltage, and the current flowing through the SF6 circuit breaker during the circuit breaker closing process.

[0078] The circuit model building module 22 is used to build an SF6 circuit breaker test circuit that simulates a power system and to connect the controlled component model of the SF6 circuit breaker to the SF6 circuit breaker test circuit.

[0079] Simulation module 23 is used to load SF6 gas parameters and arc parameters, adjust the real-time voltage and current through the break, and simulate the electromagnetic transient process of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit.

[0080] Any one or more of the modules, submodules, and units disclosed in the embodiments of the present invention, or at least part of the functions of any one or more of them, can be implemented in one module. Any one or more of the modules, submodules, and units disclosed in the embodiments of the present invention can be implemented by dividing them into multiple modules. Any one or more of the modules, submodules, and units disclosed in the embodiments of the present invention can be at least partially implemented as hardware circuits, such as Field Programmable Gate Arrays (FPGAs), Programmable Logic Arrays (PLAs), Systems-on-Chip, Systems-on-Substrate, Systems-on-Package, Application-Specific Integrated Circuits (ASICs), or implemented by hardware or firmware through any other reasonable means of integrating or packaging circuits, or implemented by any one or a suitable combination of software, hardware, and firmware. Alternatively, one or more of the modules, submodules, and units disclosed in the embodiments of the present invention can be at least partially implemented as computer program modules, which, when run, can perform corresponding functions.

[0081] For example, any plurality of the component modeling module 21, circuit modeling module 22, and simulation module 23 can be combined into one module / submodule / unit, or any one of these modules / submodules / units can be split into multiple modules / submodules / units. Alternatively, at least part of the functionality of one or more of these modules / submodules / units can be combined with at least part of the functionality of other modules / submodules / units and implemented in one module / submodule / unit. According to the embodiments disclosed in this invention, at least one of the component modeling module 21, circuit modeling module 22, and simulation module 23 can be at least partially implemented as a hardware circuit, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or implemented in hardware or firmware by any other reasonable means of integrating or packaging the circuit, or implemented in software, hardware, or firmware, or in any suitable combination of any of these three implementation methods. Alternatively, at least one of the component model building module 21, circuit model building module 22, and simulation module 23 can be at least partially implemented as a computer program module, which can perform corresponding functions when the computer program module is run.

[0082] It should be noted that the data query device part in the embodiments disclosed in this invention corresponds to the data query method part in the embodiments disclosed in this invention. The specific description of the data query device part is referred to in the data query method part, and will not be repeated here.

[0083] Figure 7 A block diagram of an electronic device suitable for implementing the methods described above, according to an embodiment of the present invention, is shown schematically. Figure 7 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the disclosed embodiments of the present invention.

[0084] like Figure 7 As shown, an electronic device 700 according to an embodiment of the present invention includes a processor 701, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 702 or a program loaded from storage portion 708 into random access memory (RAM) 703. The processor 701 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 701 may also include onboard memory for caching purposes. The processor 701 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present invention.

[0085] RAM 703 stores various programs and data required for the operation of electronic device 700. Processor 701, ROM 702, and RAM 703 are interconnected via bus 704. Processor 701 executes various operations of the method flow according to embodiments of the present invention by executing programs in ROM 702 and / or RAM 703. It should be noted that the programs may also be stored in one or more memories other than ROM 702 and RAM 703. Processor 701 may also execute various operations of the method flow according to embodiments of the present invention by executing programs stored in said one or more memories.

[0086] According to embodiments disclosed in this invention, the electronic device 700 may further include an input / output (I / O) interface 705, which is also connected to a bus 704. The electronic device 700 may also include one or more of the following components connected to the I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 710 as needed so that computer programs read from it can be installed into the storage section 708 as needed.

[0087] According to embodiments disclosed in this invention, the method flow of the disclosed embodiments can be implemented as a computer software program. For example, embodiments disclosed in this invention include a computer program product comprising a computer program carried on a computer-readable storage medium, the computer program containing program code for performing the methods shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711. When the computer program is executed by processor 701, it performs the functions defined in the system of the disclosed embodiments of this invention. According to embodiments disclosed in this invention, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0088] This invention also discloses a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs, which, when executed, implement the method according to the embodiments disclosed herein.

[0089] According to embodiments disclosed in this invention, a computer-readable storage medium can be a non-volatile computer-readable storage medium. Examples include, but are not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0090] For example, according to embodiments disclosed in this invention, a computer-readable storage medium may include one or more memories other than ROM 702 and / or RAM 703 and / or ROM 702 and RAM 307 described above.

[0091] The embodiments disclosed in this invention also include a computer program product, which includes a computer program containing program code for performing the methods provided in the embodiments of this invention. When the computer program product is run on an electronic device, the program code is used to enable the electronic device to implement the data query method provided in the embodiments of this invention.

[0092] When the computer program is executed by the processor 701, it performs the functions defined in the system / apparatus of the disclosed embodiments of the present invention. According to the embodiments disclosed in the present invention, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0093] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and may be downloaded and installed via the communication section 709, and / or installed from a removable medium 711. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0094] According to the embodiments disclosed in this invention, program code for executing the computer programs provided in the embodiments of this invention can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0095] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions. Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined and / or combined in various ways, even if such combinations are not explicitly stated in the present invention disclosure. In particular, the features described in the various embodiments and / or claims of this invention can be combined and / or combined in various ways without departing from the spirit and teachings of this invention. All such combinations and / or combinations fall within the scope of this invention.

[0096] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A simulation method considering the breaker closing pre-breakdown characteristic, characterized in that, The method comprises the following steps: Step S1, establishing an SF6 circuit breaker controlled element model in simulation software, wherein the controlled element model comprises the relationship between the closing state in the closing process of the circuit breaker and the SF6 gas parameters and the SF6 circuit breaker gap voltage, and the relationship between the arc resistance value in the closing process of the circuit breaker and the arc parameters, the SF6 circuit breaker gap voltage and the SF6 circuit breaker through current; Step S2, building an SF6 circuit breaker test circuit simulating a power system and connecting the SF6 circuit breaker controlled element model to the SF6 circuit breaker test circuit; Step S3, loading the SF6 gas parameters and the arc parameters, adjusting the real-time gap voltage and the real-time through current, and performing the system electromagnetic transient process simulation of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit; The relationship between the arc resistance value and the arc parameters, the SF6 circuit breaker gap voltage and the SF6 circuit breaker through current in the closing process of the circuit breaker is as follows: When the SF6 circuit breaker does not occur closing pre-breakdown, the arc resistance is equivalent to a large resistance; When the SF6 circuit breaker occurs closing pre-breakdown, the arc burns, and the calculation method of the arc resistance is as follows: ; where ω(i) is the arc weight function, R c is the Cassie model arc resistance, R m is the Mayr model arc resistance; ; ; Wherein, τ is the arc time constant, E is the stable arc voltage, P0 is the arc dissipated power, u is the circuit breaker voltage, and i is the circuit breaker through current; The expression of the arc weight function ω(i) is as follows: ω(i)= ? Wherein, i0 is the transition current, and k is the transition coefficient.

2. The simulation method of claim 1, wherein the pre-breakdown characteristic of the circuit breaker is considered when the circuit breaker is closed. The SF6 gas parameters include an SF6 gas calculation coefficient b and an SF6 gas density p, and a relationship between the closing state in the closing process of the circuit breaker and the SF6 gas parameters and the SF6 circuit breaker fracture voltage U SF6 is: When U SF6 When U, the SF6 circuit breaker does not occur closing pre-breakdown, U is the real-time insulation strength of the SF6 circuit breaker; When U SF6 When U ≥ U, the SF6 circuit breaker occurs closing pre-breakdown, arc occurs: U=TRV-at; a = TRV / t end ; TRV = bρD max ; Wherein, TRV is the maximum value that the insulation strength of the circuit breaker can withstand, a is a calculation coefficient, t is the duration of the closing operation of the circuit breaker contact, t end is the duration required for the closing operation to be completed, D max is the maximum opening distance of the contact of the SF6 circuit breaker.

3. The simulation method of claim 2, wherein the pre-breakdown characteristic of the circuit breaker is considered when the circuit breaker is closed. The SF6 circuit breaker test circuit comprises an alternating current power supply, an alternating current power supply impedance, a circuit breaker controlled element model, a parallel capacitor and a series reactor connected in series, a discharge coil TV is connected in parallel to the parallel capacitor, and the SF6 circuit breaker test circuit is grounded at both ends.

4. A simulation system considering the closing pre-breakdown characteristic of SF6 circuit breaker, characterized in that, The method comprises the following steps: The element model establishing module is used to establish an SF6 circuit breaker controlled element model in simulation software, wherein the controlled element model comprises the relationship between the closing state in the closing process of the circuit breaker and the SF6 gas parameters and the SF6 circuit breaker gap voltage, and the relationship between the arc resistance value in the closing process of the circuit breaker and the arc parameters, the SF6 circuit breaker gap voltage and the SF6 circuit breaker through current; The circuit model establishing module is used to build an SF6 circuit breaker test circuit simulating a power system and connect the SF6 circuit breaker controlled element model to the SF6 circuit breaker test circuit; The simulation module is used to load the SF6 gas parameters and the arc parameters, adjust the real-time gap voltage and the real-time through current, and perform the system electromagnetic transient process simulation of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit; The relationship between the arc resistance value and the arc parameters, the SF6 circuit breaker gap voltage and the SF6 circuit breaker through current in the closing process of the circuit breaker is as follows: When the SF6 circuit breaker does not occur closing pre-breakdown, the arc resistance is equivalent to a large resistance; When the SF6 circuit breaker occurs closing pre-breakdown, the arc burns, and the calculation method of the arc resistance is as follows: ; where ω(i) is the arc weight function, R c is the Cassie model arc resistance, R m is the Mayr model arc resistance; ; ; Wherein, τ is arc time constant, E is stable arc voltage, P0 is arc dissipated power, u is circuit breaker voltage, i is circuit breaker through current; The arc weight function ω(i) expression is: ω(i)= ? Wherein, i0 is transition current; k is transition coefficient.

5. The simulation system considering the pre-breakdown characteristics of SF6 circuit breakers during closing, according to claim 4, characterized in that, The SF6 gas parameters include an SF6 gas calculation coefficient b and an SF6 gas density p, and a relationship between the closing state in the closing process of the circuit breaker and the SF6 gas parameters and the SF6 circuit breaker fracture voltage U SF6 is: When U SF6 When U, the SF6 circuit breaker does not have a closing pre-breakdown, U being the real-time insulation strength of the SF6 circuit breaker; When U SF6 When U ≥ U, the SF6 circuit breaker occurs closing pre-breakdown, arc occurs: U = TRV - at; a = TRV / t end ; TRV = bρD max ; Wherein, TRV is the maximum value that the insulation strength of the circuit breaker can withstand, a is a calculation coefficient, t is the duration of the closing operation of the circuit breaker contact, t end is the duration required for the closing operation to be completed, D max is the maximum opening distance of the contact of the SF6 circuit breaker.

6. An electronic device, comprising: Comprising: One or more processors and memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 1-3.

7. A computer readable storage medium characterized in that, A computer program product comprising a computer program stored thereon, which, when executed by a processor, causes the processor to implement the method of any one of claims 1-3.

8. A computer program product, characterised in that, The computer program product comprises a computer program, which, when executed by a processor, is used to implement the method of any one of claims 1-3.

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