Method and device for determining lightning trip-out rate under multiple lightning strokes, equipment, medium and product

Abstract

The invention discloses a method, a device and equipment for determining a lightning trip-out rate under multiple lightning strokes, a medium and a product. The method comprises the following steps: determining the counterattack lightning resistance level and the shielding failure lightning resistance level of a real power transmission line; determining the lightning stroke probability of each frequency and a lightning current amplitude probability function corresponding to different return stroke times and different return stroke sequences; and determining the lightning stroke trip-out rate under multiple lightning strokes according to the counterattack lightning resistance level, the shielding failure lightning resistance level, the lightning stroke probability of each frequency and the lightning current amplitude probability function. According to the technical scheme, the lightning stroke probability of each frequency and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke sequences are considered, calculation of the lightning stroke trip-out rate under multiple lightning strokes is achieved on the basis, and the lightning stroke trip-out rate under multiple lightning strokes can be accurately determined.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of power system technology, and in particular to a method, device, equipment, medium and product for determining a lightning trip rate under multiple lightning strikes. Background Art

[0002] The lightning trip rate is a comprehensive indicator to measure the lightning protection performance of the line. By comparing the trip rates of different lines under the same conditions, the quality of their lightning protection performance can be evaluated. Factors affecting the lightning trip rate include the intensity and frequency of lightning activity, the insulation level of the line, the effectiveness of lightning protection measures, etc. Improving the lightning resistance level of the line and taking effective lightning protection measures can reduce the lightning trip rate.

[0003] At present, the research on lightning trip rate mainly focuses on single lightning strikes. In practical applications, there are often multiple lightning strikes, and the parameters related to lightning strikes of different frequencies are also different. The calculation of lightning trip rate in this case is highly complex. How to accurately determine the lightning trip rate under multiple lightning strikes is an urgent problem to be solved. Summary of the invention

[0004] The present application provides a method, device, equipment, medium and product for determining a lightning trip rate under multiple lightning strikes, so as to accurately determine the lightning trip rate under multiple lightning strikes.

[0005] In a first aspect, an embodiment of the present application provides a method for determining a lightning trip rate under multiple lightning strikes, comprising:

[0006] Determine the strike-back lightning resistance level and shielding lightning resistance level of the actual transmission line;

[0007] Determine the lightning strike probability of each frequency and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders;

[0008] The lightning trip rate under multiple lightning strikes is determined according to the strike-back lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency and the lightning current amplitude probability function.

[0009] In a second aspect, the embodiment of the present application further provides a device for determining a lightning trip rate under multiple lightning strikes, comprising:

[0010] A level determination module is used to determine the strike-back lightning resistance level and shielding lightning resistance level of the actual transmission line;

[0011] A probability determination module is used to determine the probability of lightning strikes of various frequencies and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders;

[0012] The tripping rate determination module is used to determine the lightning tripping rate under multiple lightning strikes according to the counter-strike lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency and the lightning current amplitude probability function.

[0013] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0014] one or more processors;

[0015] A storage device for storing one or more programs;

[0016] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for determining the lightning tripping rate under multiple lightning strikes as described in the first aspect.

[0017] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for determining the lightning tripping rate under multiple lightning strikes as described in the first aspect.

[0018] In a fifth aspect, an embodiment of the present application further provides a computer program product, including a computer program and / or instructions, which, when executed by a processor, implements a method for determining a lightning tripping rate under multiple lightning strikes as described in any of the above embodiments.

[0019] The embodiment of the present application provides a method, device, equipment, medium and product for determining the lightning trip rate under multiple lightning strikes. The method for determining the lightning trip rate under multiple lightning strikes includes: determining the strike-back lightning resistance level and the shielding lightning resistance level of the real transmission line; determining the lightning strike probability of each frequency, and the lightning current amplitude probability function corresponding to different strike-back times and different strike-back orders; determining the lightning trip rate under multiple lightning strikes according to the strike-back lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency and the lightning current amplitude probability function. The above technical scheme takes into account the lightning strike probability of each frequency and the lightning current amplitude probability function corresponding to different strike-back times and different strike-back orders, and on this basis realizes the calculation of the lightning trip rate under multiple lightning strikes, and can accurately determine the lightning trip rate under multiple lightning strikes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0021] Figure 1A flow chart of a method for determining a lightning trip rate under multiple lightning strikes provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a device for determining a lightning trip rate under multiple lightning strikes provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application, rather than all structures, are shown in the accompanying drawings.

[0025] It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the steps as sequential processes, many of the steps therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the steps can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0026] It should be noted that the concepts of "first", "second", etc. mentioned in the embodiments of the present application are only used to distinguish different devices, modules, units or other objects, and are not used to limit the order or interdependence of the functions performed by these devices, modules, units or other objects.

[0027] In addition, the embodiments in the present application and the features in the embodiments may be combined with each other if there is no conflict.

[0028] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0029] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the relevant content of the solution.

[0030] Figure 1A flow chart of a method for determining a lightning trip rate under multiple lightning strikes provided in an embodiment of the present application, and the present embodiment can be applied to scenarios with multiple lightning strikes. Specifically, the method for determining a lightning trip rate under multiple lightning strikes can be performed by a device for determining a lightning trip rate under multiple lightning strikes, and the device for determining a lightning trip rate under multiple lightning strikes can be implemented by software and / or hardware, and integrated in an electronic device. The electronic device includes, but is not limited to, a device with computing functions such as a computer, a smart phone, or a server, and can also be a central processing unit (CPU), a system on chip (SoC), a computer, a field-programmable gate array (FPGA), or a server microcontroller (MCU), etc.

[0031] like Figure 1 As shown, the method specifically comprises the following steps:

[0032] S110. Determine the back-strike lightning resistance level and shielding lightning resistance level of the actual transmission line.

[0033] In this embodiment, the strike-back lightning resistance level refers to the maximum lightning current value of the insulator string that does not flash over when the potential of the tower or lightning conductor rises under the action of lightning on the transmission line. It is an important technical characteristic for measuring the ability of the transmission line to resist lightning strikes. The maximum lightning current value that does not cause the insulator string to flash over can be calculated by simulating the potential change of the tower or lightning conductor under lightning strikes. The shielding lightning resistance level refers to the lightning resistance of the insulator string flashover caused by the increase in the conductor potential when lightning bypasses the lightning conductor and directly hits the conductor. It is usually related to the layout and height of the lightning conductor, the increase in the conductor potential and / or the performance of the insulator.

[0034] S120, determining the lightning strike probability of each frequency and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders.

[0035] Specifically, the probability of lightning strikes of different frequencies can refer to the ratio of lightning strikes with different return stroke times to all lightning strikes, which can be obtained through statistics. The number of lightning return strokes refers to the number of discharges that occur again after the main discharge ends during a lightning discharge process. The order of lightning return strokes refers to the order in which multiple return strokes occur during a lightning discharge process. The probability of lightning current amplitude mainly describes the probability that the lightning current amplitude exceeds a certain value. The determination of the order of lightning return strokes is mainly based on the time interval characteristics during the lightning discharge process.

[0036] S130. Determine a lightning trip rate under multiple lightning strikes according to the strike-back lightning withstand level, the shielding lightning withstand level, the lightning strike probability of each frequency, and the lightning current amplitude probability function.

[0037] In this embodiment, the lightning trip rate under multiple lightning strikes is determined according to the strike-back lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency, and the lightning current amplitude probability function. For example, in the case where the maximum strike back of multiple lightning strikes is n times, the line lightning trip rate of each strike back can be multiplied by the lightning strike probability of the corresponding frequency, and then the multiplication results corresponding to each strike back can be added to obtain the lightning trip rate under multiple lightning strikes. Exemplarily, the lightning trip rate under multiple lightning strikes N multiple It can be expressed as:

[0038]

[0039] Among them, N i is the line lightning trip rate corresponding to different return stroke times (times / (100km·a)); P(b i ) is the probability of lightning strikes of different frequencies, that is, the ratio of lightning strikes with different return strike times to all lightning strikes, and n is the maximum return strike times of multiple lightning strikes. i It is related to the strike-back lightning withstand level, shielding lightning withstand level and lightning current amplitude probability function.

[0040] The embodiment of the present application provides a method for determining the lightning trip-out rate under multiple lightning strikes, which takes into account the probability of lightning strikes of each frequency and the lightning current amplitude probability function corresponding to different return stroke numbers and different return stroke orders. On this basis, the calculation of the lightning trip-out rate under multiple lightning strikes is realized, and the lightning trip-out rate of the transmission line under multiple lightning strikes can be accurately determined, thereby promoting the improvement of the lightning protection level of the power system.

[0041] In one embodiment, the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders can be expressed as: P = 1 / [1+(I / α) β ], where P is the probability of occurrence of lightning current with an amplitude greater than or equal to I, I is the lightning current amplitude, α is the median of the lightning current amplitude, and β is the curve change rate.

[0042] Table 1 shows the parameters of the lightning current amplitude probability function for different return stroke times or different return stroke orders. As shown in Table 1, the α and β of the lightning current amplitude probability function for different return stroke times or different return stroke orders may be different. It should be noted that the values ​​of α and β in Table 1 are only used as an example and may be other values ​​in actual applications.

[0043] Table 1 Parameters of the probability function of the lightning current amplitude of each lightning strike

[0044]

[0045] In one embodiment, the lightning trip rate under multiple lightning strikes is determined according to the strike-back lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency, and the lightning current amplitude probability function, including:

[0046]

[0047] N i =N L ηgP1+P sf

[0048] N L =0.1N g (28h 0.6 +b)

[0049] η=(4.5E 0.75 -14)×10 -2

[0050] E=Un / (2li)

[0051] P sf =N d P2η

[0052]

[0053] Among them, N i is the line lightning tripping rate with different return stroke times (times / (100km·a)); N L is the number of lightning strikes on the line (times / (100km·a)); η is the arcing rate; g is the pole striking rate; N g is the density of ground-to-ground lightning (times / (km 2 a)); h is the height of the tower (m); b is the distance between the two ground wires (m); l i is the length of the insulator string (m); P sf is the circuit breaker tripping rate; I m is the maximum shielding current (kA); P1 is the probability of the lightning current exceeding the strike-back lightning withstand level I1; P2 is the probability of shielding flashover, exceeding the shielding lightning withstand level I2 and less than the maximum shielding lightning current I m The lightning current probability; N d is the number of lightning strikes under the condition of shielding failure; D(I) is the lightning width of the conductor under a certain lightning current (m), that is, the horizontal width of the exposed arc of the conductor; f(I) is the probability of occurrence of a certain lightning current amplitude; L is the line length (km); P(b i ) is the ratio of lightning strikes with different return stroke numbers to all lightning strikes; n is the maximum return stroke number of multiple lightning strikes.

[0054] In one embodiment, determining the counter-strike lightning resistance level and the shielding failure lightning resistance level of the real power transmission line includes: calculating the counter-strike lightning resistance level and the shielding failure lightning resistance level of the real power transmission line using electromagnetic transient simulation software.

[0055] Among them, electromagnetic transient simulation software mainly includes PSCAD / EMTDC and RTDS, which can be used by users to easily create and simulate various transient phenomena in power systems, conduct electromechanical transient simulation of large-scale power systems and electromagnetic transient simulation of local networks. Electromagnetic transient simulation software can be used to calculate the lightning resistance level of the real transmission line and the lightning resistance level of the shielding failure.

[0056] It should be noted that the counter-strike lightning resistance level I1 and the shielding lightning resistance level I2 under multiple lightning strikes need to be considered in real transmission lines. The strike-back time interval of multiple lightning strikes is generally 100ms, at which time the insulation performance of the flashover channel of the line insulator has most likely been restored. Therefore, the simulation of the counter-strike lightning resistance level I1 and the shielding lightning resistance level I2 under multiple lightning strikes can be regarded as the simulation of the counter-strike lightning resistance level I1 and the shielding lightning resistance level I2 under multiple independent single lightning strikes. However, considering that the lightning current waveform parameters of each strike-back of multiple lightning strikes are different, it will affect the calculation results of the line lightning resistance level.

[0057] In one embodiment, determining the lightning strike probability of each frequency and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders includes: using a lightning location system to count the lightning strike probability of each frequency, and analyzing the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders.

[0058] Among them, the lightning location system is a real-time lightning monitoring system that can display various lightning parameters such as the time, location, and number of return strokes of lightning in real time. It can be used to observe and study lightning and conduct lightning warnings. The lightning location system can be used to count the probability of lightning strikes of various frequencies and analyze the lightning current amplitude probability function corresponding to different return stroke numbers and different return stroke orders.

[0059] The following is an example of a method for determining the lightning trip rate under multiple lightning strikes in the embodiment of the present application. Taking a 500kV transmission line as an example, the process of determining the lightning trip rate under multiple lightning strikes includes:

[0060] Step S1, using electromagnetic transient simulation software to calculate the strike lightning withstand level I1 and shielding lightning withstand level I2 of the real transmission line; Table 2 shows the influence of a lightning current waveform on the lightning withstand level of a 500kV overhead transmission line.

[0061] Table 2 Influence of lightning current waveform on lightning withstand level of 500kV overhead transmission line

[0062]

[0063] Step S2, using a lightning location system to count the probability of lightning strikes of various frequencies; Table 3 shows the distribution of positive and negative polarity lightning strikes within a year.

[0064] Table 3 Distribution of positive and negative polarity lightning strikes in Guangdong Province from 2010 to 2021

[0065]

[0066] Step S3, using the lightning location system to analyze the lightning current amplitude probability function of different return stroke times and different return stroke orders; the parameters of the lightning current amplitude probability function of different return stroke times and different return stroke orders can be seen in Table 1.

[0067] Step S4, for the strike-back lightning resistance level I1 and the shielding lightning resistance level I2 in step S1, the lightning strike probability of each frequency in step S2, and the lightning current amplitude probability function in S3, according to the improved lightning trip rate calculation formula, calculate the lightning trip rate N under multiple lightning strikes considering the lightning strike probability of each frequency and the lightning current amplitude probability distribution function multiple .

[0068] Table 4 shows the lightning tripping rate of a line with different return stroke times and different return stroke orders.

[0069] Table 4 Lightning current amplitude probability function parameters and lightning trip rate of multiple lightning strikes

[0070]

[0071] Combined with the proportion of each return stroke of multiple return strokes, the line lightning trip rate N under single lightning stroke and multiple lightning strokes with different return strokes can be calculated. multiple Compared with the value of 0.12217 times / (100km·a) of the line lightning trip rate N1 under single lightning strike, the lightning trip rate increased by about 66%, indicating that the line lightning trip rate increased significantly after considering multiple lightning strikes, and the influence of multiple lightning strikes cannot be ignored in the calculation of the lightning trip rate of overhead lines.

[0072] Figure 2 A schematic diagram of a structure of a device for determining a lightning trip rate under multiple lightning strikes provided in an embodiment of the present application. The device for determining a lightning trip rate under multiple lightning strikes provided in this embodiment includes:

[0073] A level determination module 210, used to determine the strike lightning resistance level and shielding lightning resistance level of the actual transmission line;

[0074] The probability determination module 220 is used to determine the probability of lightning strikes of various frequencies and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders;

[0075] The trip rate determination module 230 is used to determine the lightning trip rate under multiple lightning strikes according to the strike-back lightning withstand level, the shielding lightning withstand level, the lightning strike probability of each frequency and the lightning current amplitude probability function.

[0076] The device uses a neural network model to predetermine the determination parameters of the lightning trip-out rate under multiple lightning strikes corresponding to different complexity levels. In the process of determining the lightning trip-out rate under multiple lightning strikes, the device selects appropriate target determination parameters of the lightning trip-out rate under multiple lightning strikes according to the complexity level, thereby improving the determination quality and efficiency of the lightning trip-out rate under multiple lightning strikes.

[0077] On the basis of the above embodiment, the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders includes:

[0078] P = 1 / [1+(I / α) β ]

[0079] Where P is the probability of occurrence of lightning current with an amplitude greater than or equal to I, I is the lightning current amplitude, α is the median of the lightning current amplitude, and β is the curve change rate. The α and β of the lightning current amplitude probability function are different for different return stroke times or different return stroke orders.

[0080] Based on the above embodiment, the trip rate determination module 230 is specifically used for:

[0081]

[0082] Among them, N i =N L ηgP1+P sf

[0083] N L =0.1N g (28h 0.6 +b)

[0084] η=(4.5E 0.75 -14)×10 -2

[0085] E=Un / (2li)

[0086] P sf =N d P2η

[0087]

[0088] N i is the line lightning trip rate with different return stroke times; N L is the number of lightning strikes on the line; η is the arcing rate; g is the pole striking rate; N gis the density of ground lightning; h is the height of the tower; b is the distance between the two ground wires; l i is the length of the insulator string; P sf is the circuit breaker tripping rate; I m is the maximum shielding current; P1 is the probability of the lightning current I1 exceeding the strike-back lightning withstand level; P2 is the probability of the lightning current I exceeding the strike-back lightning withstand level and less than the maximum shielding current I m The lightning current probability; N d is the number of lightning strikes under the condition of shielding failure; D(I) is the lightning width of the conductor under a certain lightning current; f(I) is the probability of occurrence of a certain lightning current amplitude; L is the line length; P(b i ) is the probability of lightning strikes of each frequency; n is the maximum number of return strikes of multiple lightning strikes.

[0089] Based on the above embodiment, the level determination module 210 is specifically used for:

[0090] Electromagnetic transient simulation software is used to calculate the back-strike lightning resistance level and shielding lightning resistance level of the actual transmission line.

[0091] Based on the above embodiment, the probability determination module 220 is specifically used for:

[0092] The lightning location system is used to count the lightning strike probability of each frequency, and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders is analyzed.

[0093] The device for determining the lightning tripping rate under multiple lightning strikes provided in the embodiment of the present application can be used to execute the method for determining the lightning tripping rate under multiple lightning strikes provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0094] Figure 3 A schematic diagram of an electronic device 10 that can be used to implement an embodiment of the present application is shown. The electronic device 10 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device 10 can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, user equipment, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0095] like Figure 3As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0096] Multiple components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, wireless networks.

[0097] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above.

[0098] In some embodiments, the method of the above embodiment may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform any of the above embodiment methods in any other appropriate manner (e.g., by means of firmware).

[0099] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0100] The computer programs for implementing the methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor, the functions / operations specified in the flow charts and / or block diagrams are implemented. The computer programs may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0101] In the context of the present application, a computer readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device or equipment. A computer readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium may be a machine readable signal medium. A more specific example of a machine readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0102] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device 10 having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device 10. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0103] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0104] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0105] An embodiment of the present application further provides a computer program product, including a computer program and / or instructions, which, when executed by a processor, implements the method for determining the lightning tripping rate under multiple lightning strikes as described in any of the above embodiments.

[0106] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0107] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A method for determining the lightning trip rate under multiple lightning strikes, characterized in that: include: Determine the strike-back lightning resistance level and shielding lightning resistance level of the actual transmission line; Determine the lightning strike probability of each frequency and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders; The lightning trip rate under multiple lightning strikes is determined according to the strike-back lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency and the lightning current amplitude probability function.

2. The method according to claim 1, characterized in that The lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders includes: P=1 / [1+(I / α) β ] Where P is the probability of occurrence of lightning current with an amplitude greater than or equal to I, I is the lightning current amplitude, α is the median of the lightning current amplitude, and β is the curve change rate. The α and β of the lightning current amplitude probability function are different for different return stroke times or different return stroke orders.

3. The method according to claim 1, characterized in that Determining a lightning trip rate under multiple lightning strikes according to the strike-back lightning withstand level, the shielding lightning withstand level, the lightning strike probability of each frequency, and the lightning current amplitude probability function, including: Among them, N i =N L ηgP1+P sf N L =0.1N g (28h 0.6 +b) η=(4.5E 0.75 -14)×10 -2 E=Un / (2li) P sf =N d P2η N i is the line lightning tripping rate with different return stroke times; N L is the number of lightning strikes on the line; η is the arcing rate; g is the pole striking rate; N g is the density of ground lightning; h is the height of the tower; b is the distance between the two ground wires; l i is the length of the insulator string; P sf is the circuit breaker tripping rate; I m is the maximum shielding current; P1 is the probability of the lightning current I1 exceeding the strike-back lightning withstand level; P2 is the probability of the lightning current I exceeding the strike-back lightning withstand level and less than the maximum shielding current I m The lightning current probability; N d is the number of lightning strikes under the condition of shielding failure; D(I) is the lightning width of the conductor under a certain lightning current; f(I) is the probability of occurrence of a certain lightning current amplitude; L is the line length; P(b i ) is the probability of lightning strikes of each frequency; n is the maximum number of return strikes of multiple lightning strikes.

4. The method according to claim 1, characterized in that: Determine the lightning strike resistance level and shielding lightning strike resistance level of the actual transmission line, including: Electromagnetic transient simulation software is used to calculate the back-strike lightning resistance level and shielding lightning resistance level of the actual transmission line.

5. The method according to claim 1, characterized in that Determine the lightning strike probability of each frequency and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders, including: The lightning location system is used to count the lightning strike probability of each frequency, and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders is analyzed.

6. A device for determining a lightning trip rate under multiple lightning strikes, characterized in that: include: A level determination module is used to determine the strike-back lightning resistance level and shielding lightning resistance level of the actual transmission line; A probability determination module is used to determine the probability of lightning strikes of various frequencies and the lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders; The tripping rate determination module is used to determine the lightning tripping rate under multiple lightning strikes according to the counter-strike lightning resistance level, the shielding lightning resistance level, the lightning strike probability of each frequency and the lightning current amplitude probability function.

7. The device according to claim 6, characterized in that The lightning current amplitude probability function corresponding to different return stroke times and different return stroke orders includes: P=1 / [1+(I / α) β ] Where P is the probability of occurrence of lightning current with an amplitude greater than or equal to I, I is the lightning current amplitude, α is the median of the lightning current amplitude, and β is the curve change rate. The α and β of the lightning current amplitude probability function are different for different return stroke times or different return stroke orders.

8. An electronic device, characterized in that: include: at least one processor; a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the lightning tripping rate under multiple lightning strikes as claimed in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for determining the lightning tripping rate under multiple lightning strikes as described in any one of claims 1 to 5 is implemented.

10. A computer program product comprising a computer program and / or instructions, characterized in that: When the computer program and / or the instructions are executed by the processor, the method for determining the lightning tripping rate under multiple lightning strikes as claimed in any one of claims 1 to 5 is implemented.

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