Method, device, terminal equipment and storage medium for evaluating breaking capacity of high-voltage gas circuit breaker

Abstract

The present invention discloses a method, device, terminal equipment and storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. The method constructs an initial black box model of the high-voltage gas circuit breaker based on structural parameters and design parameters, and then optimizes the model parameters in the initial black box model based on the first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test to generate a black box model, thereby overcoming the current defect of inaccurate evaluation results due to insufficient parameter accuracy. The simulation loop is then used to perform an asymmetrical short-circuit current breaking test under different test conditions on the black box model, and the breaking performance of the high-voltage gas circuit breaker is determined based on the second experimental result, thereby overcoming the current defect of high economic and time costs of the test evaluation method. Therefore, the present invention combines the test evaluation method with the simulation method in the circuit breaker breaking capacity performance evaluation method, effectively improving the reliability of the evaluation results while also saving test resources and time costs.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a method, device, terminal equipment and storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. Background Art

[0002] As voltage levels continue to rise, grid equipment increases, and network complexity increases, if a fault cannot be promptly removed, it will cause serious damage to the power supply reliability and economic benefits of the power system. High-voltage circuit breakers are important protection and control equipment in the power system, and play a vital role in the reliability and stability of my country's power system. Most of the existing circuit breakers in the power grid are tested and assessed under short-circuit currents with a time constant of 45ms or 75ms. At present, the domestic 220kV and 550kV power grids have already encountered the problem of the DC component of the short-circuit current attenuation time constant exceeding the standard. Upgrading and modifying the existing circuit breakers in operation to adapt to the new operating environment is a relatively economical and convenient way. If all the modified circuit breakers are re-tested, the cost will be greatly increased. Therefore, using a relatively economical and reliable evaluation method to verify the effectiveness of the circuit breaker asymmetric short-circuit current breaking capacity improvement technology is of great significance to the risk control of the DC component of the short-circuit current exceeding the standard.

[0003] Current methods for evaluating circuit breaker breaking capacity include experimental evaluation, empirical formulas, and simulation. However, experimental evaluation incurs significant financial and time costs, while empirical formulas or simulations can lead to inaccurate and unreliable evaluation results due to insufficient parameter precision. Summary of the Invention

[0004] Embodiments of the present invention provide a method, apparatus, terminal device, and storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. By combining the experimental evaluation method with the simulation method in the circuit breaker breaking capacity performance evaluation method, the reliability of the evaluation results is effectively improved while also saving experimental resources and time costs.

[0005] An embodiment of the present invention provides a method for evaluating the breaking capacity of a high-voltage gas circuit breaker, comprising:

[0006] Obtaining structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0007] Constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0008] According to the first experimental result, optimizing the model parameters in the initial black box model to generate a black box model;

[0009] Applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result;

[0010] The breaking performance of the high-voltage gas circuit breaker is determined according to the second experimental result.

[0011] Furthermore, constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters includes:

[0012] Based on the structural parameters and design parameters, several relational functional expressions are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational functional expressions include: a first relational functional expression for characterizing the association between contacts and nozzles of the high-voltage gas circuit breaker during the opening process, a second relational functional expression for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational functional expression for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0013] The initial black box model is constructed according to the plurality of relational functional expressions.

[0014] Furthermore, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0015] The step of optimizing the model parameters in the initial black box model according to the first experimental result to generate a black box model includes:

[0016] Obtaining the first arc current in several symmetrical short-circuit current breaking tests;

[0017] Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0018] The optimization operation includes:

[0019] Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0020] Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0021] Comparing the plurality of arc voltages to be evaluated with corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0022] When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0023] When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

[0024] Furthermore, the second experimental result includes: in each of the asymmetric short-circuit current breaking tests, a second arc voltage and a loop current measured when the high-voltage gas circuit breaker is broken;

[0025] Determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result includes:

[0026] Obtaining an expected zero point of each of the asymmetric short-circuit current breaking tests;

[0027] After the expected zero point is determined, when the loop current remains zero and the arc extinction peak value of the second arc voltage is not lower than a preset arc extinction peak threshold value, it is determined that the high-voltage gas circuit breaker has the breaking performance under the corresponding test conditions;

[0028] After determining the expected zero point, when the loop current is not zero, or an electrical breakdown phenomenon occurs, or a thermal breakdown phenomenon occurs, determining that the high-voltage gas circuit breaker does not have a breaking performance under the corresponding test conditions;

[0029] Furthermore, after obtaining the expected zero point of each asymmetric short-circuit current breaking test, the method further includes:

[0030] After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is lower than the preset arc extinction peak threshold, it is determined that the breaking capacity of the high-voltage gas circuit breaker under the corresponding test conditions cannot be evaluated.

[0031] Another embodiment of the present invention provides a device for evaluating the breaking capacity of a high-voltage gas circuit breaker, comprising:

[0032] A parameter acquisition module, configured to acquire structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0033] A model building module, configured to build an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0034] a model optimization module, configured to optimize the model parameters in the initial black box model according to the first experimental result to generate a black box model;

[0035] A simulation test module, configured to apply the black box model to a preset simulation loop, perform an asymmetric short-circuit current breaking test under different test conditions, and record a second experimental result;

[0036] A performance evaluation module is used to determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

[0037] Furthermore, the model building module builds an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters, including:

[0038] Based on the structural parameters and design parameters, several relational functional expressions are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational functional expressions include: a first relational functional expression for characterizing the association between contacts and nozzles of the high-voltage gas circuit breaker during the opening process, a second relational functional expression for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational functional expression for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0039] The initial black box model is constructed according to the plurality of relational functional expressions.

[0040] Furthermore, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0041] The model optimization module optimizes the model parameters in the initial black box model according to the first experimental result to generate a black box model, including:

[0042] Obtaining the first arc current in several symmetrical short-circuit current breaking tests;

[0043] Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0044] The optimization operation includes:

[0045] Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0046] Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0047] Comparing the plurality of arc voltages to be evaluated with corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0048] When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0049] When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

[0050] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as described in any one of the embodiments is implemented.

[0051] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as described in any of the above embodiments.

[0052] The following beneficial effects are achieved by implementing the present invention:

[0053] The present invention discloses a method, device, terminal equipment and storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. The method first constructs an initial black box model of the high-voltage gas circuit breaker based on the structural parameters and design parameters of the high-voltage gas circuit breaker to be evaluated, and then optimizes the model parameters in the initial black box model based on the first experimental result of the high-voltage gas circuit breaker in the symmetrical short-circuit current breaking test to generate a black box model, thereby overcoming the current defect of inaccurate evaluation results due to insufficient parameter accuracy. Then, a preset simulation loop is used to perform an asymmetrical short-circuit current breaking test under different test conditions on the black box model, and based on the second experimental result, the breaking performance of the high-voltage gas circuit breaker is determined, thereby overcoming the current defect of high economic and time costs of the experimental evaluation method. Therefore, the present invention combines the experimental evaluation method with the simulation method in the circuit breaker breaking capacity performance evaluation method, effectively improving the reliability of the evaluation results while also saving experimental resources and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 The present invention is a flowchart of a method for evaluating the breaking capacity of a high-voltage gas circuit breaker provided by an embodiment of the present invention.

[0055] Figure 2 The figure is a structural diagram of a breaking capacity evaluation device for a high-voltage gas circuit breaker provided by one embodiment of the present invention.

[0056] Figure 3 It is a structural diagram of a simulation loop provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0060] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0064] See also Figure 1 , is a flow chart of a method for evaluating the breaking capacity of a high-voltage gas circuit breaker provided by one embodiment of the present invention, comprising:

[0065] S1. Obtaining structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0066] In a preferred embodiment of the present invention, the structural parameters and design parameters include the contact spacing of the high-voltage gas circuit breaker, the matching relationship between the contacts and the nozzle, the opening speed, etc. A symmetrical short-circuit current breaking test is performed on the high-voltage gas circuit breaker, and the arc voltage and zero-zone current at both ends of the high-voltage gas circuit breaker are simultaneously measured during the test.

[0067] S2. constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0068] Preferably, constructing the initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters includes:

[0069] S21. Generate, based on the structural parameters and design parameters, several relational functional expressions for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational functional expressions include: a first relational functional expression for characterizing the association between contacts and nozzles of the high-voltage gas circuit breaker during the opening process, a second relational functional expression for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational functional expression for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0070] S22. Construct the initial black box model based on the plurality of relational functional expressions.

[0071] In a preferred embodiment of the present invention, a functional relationship is established between the circuit breaker opening process and the design parameters, including but not limited to the coordination between contact movement and nozzle, the relationship between nozzle cross-sectional area and flowing current, arcing time, etc. Based on the established functional relationship, the functional form of the initial black box model suitable for the high-voltage gas circuit breaker is obtained:

[0072]

[0073] Where: T1, T2, T3 are time constants; P1, P2, P3 are arc dissipation powers. For a given circuit breaker T1, T2, T3, the following relationship exists:

[0074]

[0075] It should be noted that the ratio k is related to the design parameters of an actual high-voltage gas circuit breaker and can reflect the actual state of the arc extinguishing chamber. It has currently been applied to circuit breakers with a wide range of ratings and different designs.

[0076] S3. Optimize the model parameters in the initial black box model according to the first experimental results to generate a black box model;

[0077] Preferably, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in several symmetrical short-circuit current breaking tests;

[0078] S31, optimizing the model parameters in the initial black box model according to the first experimental result to generate a black box model, including:

[0079] S32, obtaining the first arc current in several symmetrical short-circuit current breaking tests;

[0080] S33, repeatedly optimizing the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0081] The optimization operation includes:

[0082] S331. Obtain a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0083] S332: Input the first arc current into the black box model to be optimized, and solve the black box model to be optimized to generate an arc voltage to be evaluated;

[0084] S333, comparing the arc voltages to be evaluated with corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0085] S334: When the fitness is not less than a preset fitness threshold, optimize the model parameters in the black box model to be optimized according to the fitness, and generate the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0086] S335: When the fitness is less than a preset fitness threshold, use the black box model to be optimized as the black box model.

[0087] In a preferred embodiment of the present invention, a symmetrical short-circuit current breaking test is performed on a high-voltage gas circuit breaker, and the arc voltage and zero-zone current at both ends of the circuit breaker are synchronously measured. The parameters of the arc black box model are extracted and fitted, so that in a symmetrical short-circuit current breaking test simulation loop with the same test conditions as step S1, the current and arc voltage waveforms calculated after substituting the arc black box model are consistent with the arc voltage waveform measured in the experiment. At this time, the arc black box model is an arc black box model after parameter adjustment.

[0088] The arc voltage and zero-zone current in the first experimental data are extracted, and the steps of unified order of magnitude conversion of the measured data, current zero point calibration and correction, loop bus voltage drop removal, and waveform capture required for fitting are completed in sequence through data processing software such as Matlab or Python.

[0089] Taking the arc current as the known quantity, substitute it into the arc black box model differential equation of the parameters to be fitted and solve the differential equation. Taking the arc voltage as the target quantity, calculate the arc voltage obtained by the differential equation and compare it with the arc voltage measurement value at that moment. Use the least squares method to construct the following fitness function of the arc voltage Uarc:

[0090]

[0091] Genetic algorithm, particle swarm algorithm and other algorithms are used to select the parameter value with the minimum fitness, which is the arc black box model parameter corresponding to the circuit breaker.

[0092] S4. Applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result;

[0093] In a preferred embodiment of the present invention, simulation conditions of asymmetric breaking test current and voltage stress under different time constants are established, and the following is constructed: Figure 3 The corresponding simulation circuit shown simulates the asymmetric short-circuit current breaking test conditions, substitutes the adjusted arc black box model, uses it to replace the circuit breaker for simulation test, controls the circuit breaker to operate at the expected time, and calculates the corresponding zero zone current and arc voltage. Figure 3Among them, Ucs current loop voltage, L1 current loop equivalent inductance, AP arc extension loop, St tested circuit breaker (black box model arc mode l replacement), Cdh voltage loop time delay capacitance, Zh voltage loop equivalent wave impedance, Lh voltage loop inductance, Uh voltage loop charging voltage, Sa auxiliary switch.

[0094] S5. Determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

[0095] Preferably, the second experimental result includes: in each of the asymmetric short-circuit current breaking tests, the second arc voltage and the loop current measured when the high-voltage gas circuit breaker is broken;

[0096] Determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result includes:

[0097] S51. Obtaining the expected zero point of each asymmetric short-circuit current breaking test;

[0098] S52: After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is not lower than a preset arc extinction peak threshold, determining that the high-voltage gas circuit breaker has breaking performance under corresponding test conditions;

[0099] S53. After determining the expected zero point, if the loop current is not zero, or an electrical breakdown phenomenon occurs, or a thermal breakdown phenomenon occurs, determining that the high-voltage gas circuit breaker does not have a breaking performance under corresponding test conditions;

[0100] Preferably, after obtaining the expected zero point of each asymmetric short-circuit current breaking test, the method further includes:

[0101] S54. After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is lower than the preset arc extinction peak threshold, it is determined that the breaking capacity of the high-voltage gas circuit breaker under the corresponding test conditions cannot be evaluated.

[0102] In a preferred embodiment of the present invention, the calculated arc voltage and current are analyzed to evaluate the breaking performance of the modified circuit breaker.

[0103] If the simulation results show that the zero-zone current can be interrupted at the expected current zero point, the current remains zero after the expected zero point, and the arc extinction peak of the arc voltage is not lower than the minimum interruption arc extinction peak value (empirical value), then the circuit breaker is considered to have the asymmetric short-circuit current breaking capability under these conditions.

[0104] If the current is not zero after the expected current zero point, or electrical breakdown or thermal breakdown occurs after zero, the circuit breaker is considered to not have the asymmetric short-circuit current breaking capacity under this condition.

[0105] If the current is zero after the expected current zero point, but the peak value of the arc extinction spike is lower than the minimum arc extinction spike during breaking, the circuit breaker is considered to be in the critical breaking range at this time, and the breaking capacity under this condition can be further evaluated through tests or other evaluation methods.

[0106] This embodiment provides a method for evaluating the breaking capacity of a high-voltage gas circuit breaker. By constructing an initial black box model of the high-voltage gas circuit breaker based on structural parameters and design parameters, and then optimizing the model parameters in the initial black box model based on the first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test, a black box model is generated, which overcomes the current defect of inaccurate evaluation results due to insufficient parameter accuracy. Then, a simulation loop is used to perform an asymmetrical short-circuit current breaking test on the black box model under different test conditions, and the breaking performance of the high-voltage gas circuit breaker is determined based on the second experimental result, thereby overcoming the current defect of high economic and time costs of the experimental evaluation method. Therefore, this embodiment combines the experimental evaluation method with the simulation method in the circuit breaker breaking capacity performance evaluation method, effectively improving the reliability of the evaluation results while saving experimental resources and time costs.

[0107] See also Figure 2 , is a schematic structural diagram of a breaking capacity evaluation device for a high-voltage gas circuit breaker provided by one embodiment of the present invention, comprising:

[0108] A parameter acquisition module, configured to acquire structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0109] A model building module, configured to build an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0110] a model optimization module, configured to optimize the model parameters in the initial black box model according to the first experimental result to generate a black box model;

[0111] A simulation test module, configured to apply the black box model to a preset simulation loop, perform an asymmetric short-circuit current breaking test under different test conditions, and record a second experimental result;

[0112] A performance evaluation module is used to determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

[0113] Furthermore, the model building module builds an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters, including:

[0114] Based on the structural parameters and design parameters, several relational functional expressions are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational functional expressions include: a first relational functional expression for characterizing the association between contacts and nozzles of the high-voltage gas circuit breaker during the opening process, a second relational functional expression for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational functional expression for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0115] The initial black box model is constructed according to the plurality of relational functional expressions.

[0116] Furthermore, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0117] The model optimization module optimizes the model parameters in the initial black box model according to the first experimental result to generate a black box model, including:

[0118] Obtaining the first arc current in several symmetrical short-circuit current breaking tests;

[0119] Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0120] The optimization operation includes:

[0121] Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0122] Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0123] Comparing the plurality of arc voltages to be evaluated with corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0124] When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0125] When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

[0126] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0127] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0128] Another preferred embodiment of the present invention provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as described in any one of the above embodiments is implemented.

[0129] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0130] The processor may be a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, connecting various parts of the entire terminal device using various interfaces and lines.

[0131] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0132] Another preferred embodiment of the present invention provides a storage medium, which is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0133] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker, characterized in that: include: Obtaining structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test; Based on the structural parameters and design parameters, several relational functional expressions are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational functional expressions include: a first relational functional expression for characterizing the association between contacts and nozzles of the high-voltage gas circuit breaker during the opening process, a second relational functional expression for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational functional expression for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process; and an initial black box model is constructed based on the several relational functional expressions; According to the first experimental result, optimizing the model parameters in the initial black box model to generate a black box model; Applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result; The breaking performance of the high-voltage gas circuit breaker is determined according to the second experimental result.

2. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 1, characterized in that: The first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a plurality of symmetrical short-circuit current breaking tests; The step of optimizing the model parameters in the initial black box model according to the first experimental result to generate a black box model includes: Obtaining the first arc current in several symmetrical short-circuit current breaking tests; Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated; The optimization operation includes: Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model; Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated; Comparing the plurality of arc voltages to be evaluated with corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function; When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters; When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

3. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 2, characterized in that: The second experimental result includes: a second arc voltage and a loop current measured when the high-voltage gas circuit breaker is broken in each of the asymmetric short-circuit current breaking tests; Determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result includes: Obtaining an expected zero point of each of the asymmetric short-circuit current breaking tests; After the expected zero point is determined, when the loop current remains zero and the arc extinction peak value of the second arc voltage is not lower than a preset arc extinction peak threshold value, it is determined that the high-voltage gas circuit breaker has the breaking performance under the corresponding test conditions; After the expected zero point is determined, if the loop current is not zero, or an electrical breakdown phenomenon occurs, or a thermal breakdown phenomenon occurs, it is determined that the high-voltage gas circuit breaker does not have a breaking performance under the corresponding test conditions.

4. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 3, characterized in that: After obtaining the expected zero point of each asymmetrical short-circuit current breaking test, the method further includes: After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is lower than the preset arc extinction peak threshold, it is determined that the breaking capacity of the high-voltage gas circuit breaker under the corresponding test conditions cannot be evaluated.

5. A device for evaluating the breaking capacity of a high-voltage gas circuit breaker, characterized in that: include: A parameter acquisition module, configured to acquire structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test; a model construction module, configured to generate, based on the structural parameters and design parameters, a plurality of relational functional expressions for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational functional expressions include: a first relational functional expression for characterizing the association between contacts and nozzles of the high-voltage gas circuit breaker during the opening process, a second relational functional expression for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational functional expression for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process; and constructing an initial black box model based on the plurality of relational functional expressions; a model optimization module, configured to optimize the model parameters in the initial black box model according to the first experimental result to generate a black box model; A simulation test module, configured to apply the black box model to a preset simulation loop, perform an asymmetric short-circuit current breaking test under different test conditions, and record a second experimental result; A performance evaluation module is used to determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

6. The breaking capacity evaluation device for a high-voltage gas circuit breaker according to claim 5, characterized in that: The first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a plurality of symmetrical short-circuit current breaking tests; The model optimization module optimizes the model parameters in the initial black box model according to the first experimental result to generate a black box model, including: Obtaining the first arc current in several symmetrical short-circuit current breaking tests; Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated; The optimization operation includes: Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model; Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated; Comparing the plurality of arc voltages to be evaluated with corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function; When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters; When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

7. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to any one of claims 1 to 4 is implemented.

8. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to any one of claims 1 to 4.

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