Lightning surge protection control method and system based on outdoor power supply

Abstract

The invention relates to a lightning stroke surge protection control method and system based on an outdoor power supply, and the method comprises the steps: obtaining a surge instantaneous voltage when the outdoor power supply is struck by lightning, and carrying out the grounding processing of an access end of the surge instantaneous voltage when the surge instantaneous voltage exceeds a front end voltage peak value of the outdoor power supply, the method comprises the following steps: acquiring an interference voltage on an external circuit of a power supply after a surge voltage is grounded, calculating a surge coupling inductance on the outdoor power supply caused by the surge transient voltage and the interference voltage, calculating a steady-state operation inductance in a normal working state of the outdoor power supply, and calculating the surge impact frequency of the outdoor power supply according to the steady-state operation inductance and the surge coupling inductance. And calculating the differential mode inductance of the outdoor power supply under the lightning stroke surge, performing excitation impedance adjustment on a voltage transformer of the outdoor power supply, and isolating surge interference voltage in the voltage conversion process to obtain lightning stroke surge protection data of the outdoor power supply. The outdoor power supply has the effect of improving the lightning surge protection capability of the outdoor power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply protection, and in particular to a lightning surge protection control method and system based on an outdoor power supply. Background Art

[0002] At present, the power supply voltage required for outdoor electrical equipment such as street lamps is relatively low, and they are usually driven by outdoor power supplies that convert AC power into DC power. However, the outdoor environment is changeable, especially during thunderstorms. Lightning often generates electromagnetic fields in the air during transmission, inducing thousands of volts of voltage to produce surges, which indirectly attack the outdoor power supply. This makes the street lamps themselves and the outdoor power supply vulnerable to lightning surges to a certain extent, and it is necessary to further improve the protection performance of the outdoor power supply under lightning surges.

[0003] Existing power supply lightning surge protection methods usually include installing certain lightning surge protection products in the driving power supply to absorb the ultra-high part of the lightning surge at the front end of the driving power supply. However, due to the complex structure of the internal electronic components of the driving power supply, the front-end surge absorption system of the driving power supply can withstand the lightning surge impact for a short time, but long-term high surge impact is likely to damage the internal electrical components of the power supply and cause the power supply to be in a long-term consumption process, thereby greatly reducing the driving power supply The stability and durability of use, therefore, it is necessary to further optimize the lightning surge protection capability of the outdoor power supply. Summary of the invention

[0004] In order to improve the lightning surge protection capability of an outdoor power supply and improve the use stability and durability of the outdoor power supply, the present application provides a lightning surge protection control method and system based on an outdoor power supply.

[0005] In the first aspect, the above-mentioned invention objective of the present application is achieved through the following technical solutions:

[0006] A lightning surge protection control method based on an outdoor power supply, comprising:

[0007] Obtaining a surge instantaneous voltage when an outdoor power supply is struck by lightning, and when the surge instantaneous voltage exceeds a front-end voltage peak value of the outdoor power supply, grounding an access end of the surge instantaneous voltage;

[0008] Obtaining the interference voltage caused by the surge voltage grounding process to the external line of the outdoor power supply, and calculating the surge coupling inductance caused by the surge instantaneous voltage and the interference voltage to the outdoor power supply;

[0009] Calculate the steady-state operating inductance of the outdoor power supply under normal working conditions, and calculate the differential mode inductance of the outdoor power supply under lightning surge according to the steady-state operating inductance and the surge coupling inductance in combination with the surge impact frequency of the outdoor power supply;

[0010] The excitation impedance of the voltage transformer of the outdoor power supply is adjusted according to the differential mode inductor, the surge interference voltage of the outdoor power supply during the voltage conversion process is isolated, and the lightning surge protection data of the outdoor power supply is obtained.

[0011] In a preferred example, the present application can be further configured as follows: the calculation of the steady-state operating inductance of the outdoor power supply under normal working conditions, combined with the surge impact frequency of the outdoor power supply, and the calculation of the differential mode inductance of the outdoor power supply under lightning surge according to the steady-state operating inductance and the surge coupling inductance, specifically includes:

[0012] The differential mode inductance of the outdoor power supply under lightning surge is calculated by formula (1), which is as follows:

[0013]

[0014] Among them, L (差) Indicates the differential mode inductance of the outdoor power supply under lightning surge, U p Indicates the surge peak voltage, U c Indicates the steady-state operating voltage of the outdoor power supply, L (耦) , L (稳) Respectively represent the surge coupling inductance and steady-state operation inductance, It represents the derivative of the operating current of the outdoor power supply with respect to time, and is used to represent the current change under surge impact, f 运 、f 浪 They respectively represent the inductance conversion frequency of the outdoor power supply under normal working conditions and the surge impact frequency under lightning strike conditions.

[0015] In a preferred example, the present application can be further configured as follows: the obtaining of the interference voltage caused to the external line of the outdoor power supply after the surge voltage grounding process, and the calculation of the surge instantaneous voltage and the surge coupling inductance caused to the outdoor power supply by the interference voltage specifically include:

[0016] The surge coupling inductance caused by the surge transient voltage and interference voltage on the outdoor power supply is calculated by formula (2). Formula (1) is as follows:

[0017]

[0018] Among them, L (耦) represents the surge coupling inductance of the outdoor power supply, A represents the propagation coefficient of the soil medium where the outdoor power supply is located, U 扰 Indicates the interference voltage, U 扰 =U 瞬 -U 峰, t represents the current change time of the outdoor power supply under the current surge impact, τ1 and τ2 represent the pulse width of the surge transient voltage and the common-mode surge pulse width generated by the superposition of the interference voltage and the surge transient voltage, respectively. It represents the time derivative of the current change under surge impact.

[0019] By adopting the above technical solution, when the outdoor power supply is struck by lightning, according to the comparison relationship between the surge instantaneous voltage of the lightning strike and the front-end voltage peak of the outdoor power supply, it is analyzed whether the current lightning strike will cause loss to the outdoor power supply, and when the surge instantaneous voltage exceeds the front-end voltage peak, the access end of the surge instantaneous voltage is grounded in time to reduce the damage of the ultra-high voltage surge impact to the outdoor power supply, and the surge coupling inductance of the outdoor power supply under the current lightning surge is calculated in combination with the indirect interference voltage caused by the surge voltage after grounding to the external line of the outdoor power supply, and the comprehensive impact of the lightning surge on the outdoor power supply is reasonably analyzed to provide a reference for the design of the outdoor power supply. High analysis accuracy, combined with steady-state operating inductance and surge impact frequency, calculates the differential mode inductance of the outdoor power supply under lightning surge, which helps to improve the analysis accuracy of the impact of lightning surge on the internal outdoor power supply, and adjusts the excitation impedance of the voltage transformer according to the differential mode inductance, which helps to isolate the surge interference voltage during the voltage conversion process of the outdoor power supply, improve the protection performance of the outdoor power supply against lightning surge impact, and then improve the lightning surge protection capability of the outdoor power supply, by reducing the impact of lightning surge impact on the internal components of the outdoor power supply, to improve the stability and durability of the outdoor power supply.

[0020] In a preferred example, the present application can be further configured as follows: adjusting the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductor, isolating the surge interference voltage of the outdoor power supply during the voltage conversion process, and obtaining the lightning surge protection data of the outdoor power supply, specifically including:

[0021] Calculating a surge magnetic flux change value at the input end of the outdoor power supply according to the differential mode inductance, and determining whether a single change of the surge magnetic flux exceeds a saturation magnetic flux of the voltage transformer;

[0022] If yes, then a supplementary impedance value corresponding to the surge magnetic flux exceeding the saturation magnetic flux is calculated, and excitation compensation processing is performed on the input end of the voltage transformer according to the supplementary impedance value to obtain primary excitation adjustment data of the voltage transformer;

[0023] According to the primary excitation adjustment data, the surge interference voltage of the outdoor power supply during the voltage conversion process is isolated to obtain the lightning surge protection data of the outdoor power supply.

[0024] By adopting the above technical solution and calculating the surge flux change at the input end of the outdoor power supply in combination with the differential mode inductor, it is helpful to accurately grasp the surge impact of the lightning surge impact on the voltage transformer of the outdoor power supply, and judge whether the single change of the surge flux exceeds the saturation flux of the voltage transformer, so as to reasonably protect the voltage transformer. When the surge flux change exceeds the saturation flux, the input end of the voltage transformer is subjected to excitation compensation processing through the supplementary impedance value corresponding to the excess part of the surge flux, so as to obtain accurate primary excitation adjustment data of the input end of the voltage transformer, which is helpful to accurately isolate the surge interference voltage in the voltage transformation process, and further improve the lightning surge protection performance of the outdoor power supply.

[0025] In a preferred example, the present application can be further configured as follows: adjusting the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductor, isolating the surge interference voltage of the outdoor power supply during the voltage conversion process, and obtaining the lightning surge protection data of the outdoor power supply, and further comprising:

[0026] Calculating the residual magnetism after excitation compensation at the input end of the voltage transformer, adjusting the excitation impedance at the output end of the voltage transformer according to the residual magnetism, and obtaining secondary excitation adjustment data of the voltage transformer;

[0027] According to the primary excitation adjustment data and the secondary excitation adjustment data, voltage isolation processing is performed on the surge interference voltage of the outdoor power supply during the voltage conversion process to obtain lightning surge protection data of the outdoor power supply.

[0028] By adopting the above technical solution, when the surge interference voltage exceeds the maximum isolation threshold of the voltage transformer input end, the excitation impedance of the output end of the voltage transformer is adjusted by calculating the residual magnetism of the voltage transformer input end after excitation compensation, and the primary excitation adjustment result is compensated by the secondary excitation adjustment data, thereby performing coordinated voltage isolation on the surge interference voltage of the outdoor power supply during the voltage conversion process, improving the coordinated adjustment capability of the outdoor power supply to the surge interference voltage, and further improving the protection capability of the outdoor power supply to lightning surge impacts.

[0029] In the second aspect, the above invention objective of the present application is achieved through the following technical solutions:

[0030] A lightning surge protection control system based on an outdoor power supply, the system is applied to the above-mentioned lightning surge protection control method based on an outdoor power supply, the system comprising:

[0031] A data acquisition module is used to acquire a surge instantaneous voltage when an outdoor power supply is struck by lightning, and when the surge instantaneous voltage exceeds a front-end voltage peak value of the outdoor power supply, a grounding treatment is performed on an access end of the surge instantaneous voltage;

[0032] A data calculation module, used for obtaining the interference voltage caused to the external line of the outdoor power supply after the surge voltage grounding treatment, and calculating the surge instantaneous voltage and the surge coupling inductance caused by the interference voltage to the outdoor power supply;

[0033] A data processing module is used to calculate the steady-state operating inductance of the outdoor power supply under normal working conditions, and to calculate the differential mode inductance of the outdoor power supply under lightning surge according to the steady-state operating inductance and the surge coupling inductance in combination with the surge impact frequency of the outdoor power supply;

[0034] The surge protection module is used to adjust the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductance, isolate the surge interference voltage during the voltage conversion process of the outdoor power supply, and obtain the lightning surge protection data of the outdoor power supply.

[0035] By adopting the above technical solution, when the outdoor power supply is struck by lightning, according to the comparison relationship between the surge instantaneous voltage of the lightning strike and the front-end voltage peak of the outdoor power supply, it is analyzed whether the current lightning strike will cause loss to the outdoor power supply, and when the surge instantaneous voltage exceeds the front-end voltage peak, the access end of the surge instantaneous voltage is grounded in time to reduce the damage of the ultra-high voltage surge impact to the outdoor power supply, and the surge coupling inductance of the outdoor power supply under the current lightning surge is calculated in combination with the indirect interference voltage caused by the surge voltage after grounding to the external line of the outdoor power supply, and the comprehensive impact of the lightning surge on the outdoor power supply is reasonably analyzed to provide a reference for the design of the outdoor power supply. High analysis accuracy, combined with steady-state operating inductance and surge impact frequency, calculates the differential mode inductance of the outdoor power supply under lightning surge, which helps to improve the analysis accuracy of the impact of lightning surge on the internal outdoor power supply, and adjusts the excitation impedance of the voltage transformer according to the differential mode inductance, which helps to isolate the surge interference voltage during the voltage conversion process of the outdoor power supply, improve the protection performance of the outdoor power supply against lightning surge impact, and then improve the lightning surge protection capability of the outdoor power supply, by reducing the impact of lightning surge impact on the internal components of the outdoor power supply, to improve the stability and durability of the outdoor power supply.

[0036] On the third aspect, the above-mentioned purpose of the present application is achieved through the following technical solutions:

[0037] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned lightning surge protection control method based on an outdoor power supply are implemented.

[0038] Fourthly, the above-mentioned purpose of the present application is achieved through the following technical solutions:

[0039] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned lightning surge protection control method based on an outdoor power supply are implemented.

[0040] In summary, the present application includes at least one of the following beneficial technical effects:

[0041] 1. When the outdoor power supply is struck by lightning, the comparison relationship between the surge instantaneous voltage of the lightning strike and the peak voltage of the front-end voltage of the outdoor power supply is used to analyze whether the current lightning strike will cause loss to the outdoor power supply. When the surge instantaneous voltage exceeds the peak voltage of the front-end voltage, the access end of the surge instantaneous voltage is grounded in time to reduce the damage of the ultra-high voltage surge impact to the outdoor power supply. In addition, the surge coupling inductance of the outdoor power supply under the current lightning surge is calculated in combination with the indirect interference voltage caused by the surge voltage after grounding to the external line of the outdoor power supply. The comprehensive impact of the lightning surge on the outdoor power supply is reasonably analyzed to improve the accuracy of the analysis. The differential mode inductance of the outdoor power supply under lightning surge is calculated by combining the steady-state operating inductance and the surge impact frequency, which helps to improve the accuracy of the analysis of the impact of lightning surge on the internal part of the outdoor power supply, and adjust the excitation impedance of the voltage transformer according to the differential mode inductance, which helps to isolate the surge interference voltage during the voltage conversion process of the outdoor power supply, improve the protection performance of the outdoor power supply against lightning surge impact, and then improve the lightning surge protection capability of the outdoor power supply, and improve the stability and durability of the outdoor power supply by reducing the impact of lightning surge impact on the internal components of the outdoor power supply;

[0042] 2. Calculating the surge flux change at the input end of the outdoor power supply in combination with the differential mode inductor helps to accurately grasp the surge impact of the lightning surge on the voltage transformer of the outdoor power supply, and judge whether the single change of the surge flux exceeds the saturation flux of the voltage transformer, so as to reasonably protect the voltage transformer. When the surge flux change exceeds the saturation flux, the input end of the voltage transformer is subjected to excitation compensation processing by the supplementary impedance value corresponding to the excess surge flux, so as to obtain accurate primary excitation adjustment data at the input end of the voltage transformer, which helps to accurately isolate the surge interference voltage in the voltage transformation process, and further improve the lightning surge protection performance of the outdoor power supply;

[0043] 3. When the surge interference voltage exceeds the maximum isolation threshold of the voltage transformer input end, the excitation impedance of the voltage transformer output end is adjusted by calculating the residual magnetism of the voltage transformer input end after excitation compensation, and the primary excitation adjustment result is compensated by the secondary excitation adjustment data, thereby performing coordinated voltage isolation on the surge interference voltage of the outdoor power supply during the voltage conversion process, improving the coordinated adjustment capability of the outdoor power supply to the surge interference voltage, and further improving the protection capability of the outdoor power supply to lightning surge impacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a flow chart of an implementation method of a lightning surge protection control method based on an outdoor power supply in this embodiment.

[0045] Figure 2 This is a flowchart for implementing an excitation adjustment in step S40 of the lightning surge protection control method of this embodiment.

[0046] Figure 3 This is a flowchart for implementing the secondary excitation adjustment in step S40 of the lightning surge protection control method of this embodiment.

[0047] Figure 4 This is a structural block diagram of a lightning surge protection control system based on an outdoor power supply in this embodiment.

[0048] Figure 5 Schematic diagram of the internal structure of a computer device used to implement the lightning surge protection control method of this embodiment. DETAILED DESCRIPTION

[0049] The present application is further described in detail below in conjunction with the accompanying drawings.

[0050] In one embodiment, if Figure 1 As shown, the present application discloses a lightning surge protection control method based on an outdoor power supply, which specifically includes the following steps:

[0051] S10: Obtain a surge instantaneous voltage when the outdoor power supply is struck by lightning. When the surge instantaneous voltage exceeds the front-end voltage peak of the outdoor power supply, perform grounding on the access end of the surge instantaneous voltage.

[0052] Specifically, before the outdoor power supply is put into use, a climate and environmental survey is conducted on the actual use site of the outdoor power supply, and a lightning surge generator is set up in combination with actual climate conditions to conduct a lightning surge test on the outdoor power supply. The surge instantaneous voltage when the outdoor power supply is struck by lightning is obtained through a high-voltage probe, and when the surge instantaneous voltage exceeds the front-end voltage peak of the outdoor power supply, the grounding circuit of the outdoor power supply is connected, and the access end of the surge instantaneous voltage is grounded, where the front-end voltage peak refers to the power input end of the outdoor power supply.

[0053] S20: Obtain the interference voltage caused by the surge voltage grounding process to the external line of the outdoor power supply, and calculate the surge coupling inductance caused by the surge instantaneous voltage and the interference voltage to the outdoor power supply.

[0054] Specifically, the surge coupling inductance caused by the surge transient voltage and the interference voltage on the outdoor power supply is calculated by formula (2). Formula (1) is as follows:

[0055]

[0056] Among them, L (耦) represents the surge coupling inductance of the outdoor power supply, A represents the propagation coefficient of the soil medium where the outdoor power supply is located, U 扰 Indicates the interference voltage, U 扰 =U 瞬 -U 峰 , t represents the current change time of the outdoor power supply under the current surge impact, τ1 and τ2 represent the pulse width of the surge transient voltage and the common-mode surge pulse width generated by the superposition of the interference voltage and the surge transient voltage, respectively. It represents the time derivative of the current change under surge impact.

[0057] S30: Calculate the steady-state operating inductance of the outdoor power supply under normal working conditions, and calculate the differential mode inductance of the outdoor power supply under lightning surge based on the steady-state operating inductance and surge coupling inductance in combination with the surge impact frequency of the outdoor power supply.

[0058] Specifically, the steady-state operating inductance of the outdoor power supply under normal working conditions is calculated by formula (3), and formula (3) is as follows:

[0059] L (稳) =μ×Ae×N 2 / l (3)

[0060] Among them, L (稳) It represents the steady-state operating inductance of the outdoor power supply under normal working conditions, μ represents the magnetic permeability of the magnetic core during steady-state operation, Ae represents the cross-sectional area of ​​the magnetic core, N represents the number of coil turns, and l represents the magnetic path length of the magnetic core of the outdoor power supply.

[0061] The differential mode inductance of the outdoor power supply under lightning surge is calculated by formula (1), which is as follows:

[0062]

[0063] Among them, LC (差) Indicates the differential mode inductance of the outdoor power supply under lightning surge, U p Indicates the surge peak voltage, U c Indicates the steady-state operating voltage of the outdoor power supply, L (耦) , L (稳) Respectively represent the surge coupling inductance and steady-state operation inductance, It represents the derivative of the operating current of the outdoor power supply with respect to time, and is used to represent the current change under surge impact, f 运 、f 浪 They respectively represent the inductance conversion frequency of the outdoor power supply under normal working conditions and the surge impact frequency under lightning strike conditions.

[0064] S40: adjusting the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductance, isolating the surge interference voltage during the voltage conversion process of the outdoor power supply, and obtaining the lightning surge protection data of the outdoor power supply.

[0065] Specifically, Figure 2 As shown, step S40 includes:

[0066] S401: Calculate the surge magnetic flux change value at the input end of the outdoor power supply according to the differential mode inductance, and determine whether a single change of the surge magnetic flux exceeds the saturation magnetic flux of the voltage transformer.

[0067] Specifically, the surge flux change value at the input end of the outdoor power supply is calculated according to the differential mode inductance, and it is determined whether the single change value of the surge flux exceeds the saturation flux of the voltage transformer, wherein the saturation flux is related to the steady-state inductance of the voltage transformer under normal operation, and the differential mode inductance and the surge flux change value are expressed by formula (4), which is as follows:

[0068]

[0069] in, It represents the magnetic flux per unit time t.

[0070] S402: If yes, then calculate the supplementary impedance value corresponding to the surge magnetic flux exceeding the saturation magnetic flux, perform excitation compensation processing on the input end of the voltage transformer according to the supplementary impedance value, and obtain primary excitation adjustment data of the voltage transformer.

[0071] Specifically, when a single change of the surge magnetic flux exceeds the saturation magnetic flux of the voltage transformer, the compensation impedance value corresponding to the portion of the surge magnetic flux exceeding the saturation magnetic flux is calculated and expressed by formula (5), and the excitation compensation value at the input end of the voltage transformer is adjusted according to the supplementary impedance value, thereby obtaining the primary excitation adjustment data of the voltage transformer, wherein formula (5) is as follows:

[0072]

[0073] Among them, R m It represents the compensation impedance value corresponding to the partial surge magnetic flux exceeding the saturation magnetic flux, ΔΦ is the partial surge magnetic flux exceeding the saturation magnetic flux, and ΔI represents the output current change of the outdoor power supply within unit time Δt when a lightning surge occurs.

[0074] S403: Isolating the surge interference voltage of the outdoor power supply during the voltage conversion process according to the primary excitation adjustment data, and obtaining the lightning surge protection data of the outdoor power supply.

[0075] Specifically, Figure 3 As shown, step S40 also includes:

[0076] S404: Calculate the residual magnetism at the input end of the voltage transformer after excitation compensation, adjust the excitation impedance at the output end of the voltage transformer according to the residual magnetism, and obtain secondary excitation adjustment data of the voltage transformer.

[0077] Specifically, the residual magnetism at the input end of the voltage transformer after excitation compensation is calculated by formula (6), and the excitation impedance of the output end of the voltage transformer is adjusted according to the residual magnetism, so as to obtain the secondary excitation adjustment data of the voltage transformer, wherein formula (6) is as follows:

[0078] B=μ0(H+M r )-H d (6)

[0079] Among them, B represents the residual magnetism, μ0 represents the vacuum permeability of the voltage transformer, H represents the magnetic field strength under lightning surge interference, M r Represents the residual magnetization, H d Indicates the interference field strength under lightning surge.

[0080] S405: performing voltage isolation processing on the surge interference voltage of the outdoor power supply during the voltage conversion process according to the primary excitation adjustment data and the secondary excitation adjustment data, and obtaining lightning surge protection data of the outdoor power supply.

[0081] Specifically, according to the primary excitation adjustment data and the secondary excitation adjustment data, the surge interference voltage of the outdoor power supply during the voltage conversion process is isolated in layers, thereby reducing the voltage conversion interference of the lightning surge interference voltage on the outdoor power supply, and the outdoor power supply is protected at multiple levels to form lightning surge protection data for the outdoor power supply.

[0082] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0083] In one embodiment, a lightning surge protection control system based on an outdoor power supply is provided, and the lightning surge protection control system based on an outdoor power supply corresponds one-to-one to the lightning surge protection control method based on an outdoor power supply in the above embodiment. Figure 4 As shown, the lightning surge protection control system based on outdoor power supply includes a data acquisition module, a data calculation module, a data processing module and a surge protection module. The detailed description of each functional module is as follows:

[0084] The data acquisition module is used to obtain the surge instantaneous voltage when the outdoor power supply is struck by lightning. When the surge instantaneous voltage exceeds the front-end voltage peak of the outdoor power supply, the access end of the surge instantaneous voltage is grounded.

[0085] The data calculation module is used to obtain the interference voltage caused by the surge voltage grounding process to the external line of the outdoor power supply, and calculate the surge coupling inductance caused by the surge instantaneous voltage and the interference voltage to the outdoor power supply.

[0086] The data processing module is used to calculate the steady-state operating inductance of the outdoor power supply under normal working conditions, and calculate the differential mode inductance of the outdoor power supply under lightning surge according to the steady-state operating inductance and surge coupling inductance in combination with the surge impact frequency of the outdoor power supply.

[0087] The surge protection module is used to adjust the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductance, isolate the surge interference voltage during the voltage conversion process of the outdoor power supply, and obtain the lightning surge protection data of the outdoor power supply.

[0088] Preferably, the surge protection module specifically includes:

[0089] The data judgment submodule is used to calculate the surge magnetic flux change value at the input end of the outdoor power supply according to the differential mode inductance, and to judge whether a single change of the surge magnetic flux exceeds the saturation magnetic flux of the voltage transformer.

[0090] The primary excitation submodule is used to calculate the supplementary impedance value corresponding to the surge magnetic flux exceeding the saturation magnetic flux part, and perform excitation compensation processing on the input end of the voltage transformer according to the supplementary impedance value to obtain the primary excitation adjustment data of the voltage transformer.

[0091] The primary protection submodule is used to isolate the surge interference voltage of the outdoor power supply during the voltage conversion process according to the primary excitation adjustment data, and obtain the lightning surge protection data of the outdoor power supply.

[0092] Preferably, the surge protection module further includes:

[0093] The secondary excitation submodule is used to calculate the residual magnetism at the input end of the voltage transformer after excitation compensation, adjust the excitation impedance at the output end of the voltage transformer according to the residual magnetism, and obtain the secondary excitation adjustment data of the voltage transformer.

[0094] The secondary protection submodule is used to perform voltage isolation processing on the surge interference voltage of the outdoor power supply during the voltage conversion process according to the primary excitation adjustment data and the secondary excitation adjustment data, so as to obtain the lightning surge protection data of the outdoor power supply.

[0095] Preferably, the data processing module specifically includes:

[0096] The differential mode inductance of the outdoor power supply under lightning surge is calculated by formula (1), which is as follows:

[0097]

[0098] Among them, L (差) Indicates the differential mode inductance of the outdoor power supply under lightning surge, U p Indicates the surge peak voltage, U c Indicates the steady-state operating voltage of the outdoor power supply, L (耦) , L (稳) Respectively represent the surge coupling inductance and steady-state operation inductance, It represents the derivative of the operating current of the outdoor power supply with respect to time, and is used to represent the current change under surge impact, f 运 、f 浪 They respectively represent the inductance conversion frequency of the outdoor power supply under normal working conditions and the surge impact frequency under lightning strike conditions.

[0099] Preferably, the data calculation module specifically includes:

[0100] The surge coupling inductance caused by the surge transient voltage and interference voltage on the outdoor power supply is calculated by formula (2). Formula (1) is as follows:

[0101]

[0102] Among them, L (耦) represents the surge coupling inductance of the outdoor power supply, A represents the propagation coefficient of the soil medium where the outdoor power supply is located, U 扰 Indicates the interference voltage, U 扰 =U 瞬 -U 峰 , t represents the current change time of the outdoor power supply under the current surge impact, τ1 and τ2 represent the pulse width of the surge transient voltage and the common-mode surge pulse width generated by the superposition of the interference voltage and the surge transient voltage, respectively. It represents the time derivative of the current change under surge impact.

[0103] For the specific definition of the lightning surge protection control system based on an outdoor power supply, please refer to the definition of the lightning surge protection control method based on an outdoor power supply above, which will not be repeated here. Each module in the above-mentioned lightning surge protection control system based on an outdoor power supply can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0104] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store protection data of outdoor power supplies under lightning surges. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a lightning surge protection control method based on an outdoor power supply is implemented.

[0105] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned lightning surge protection control method based on an outdoor power supply are implemented.

[0106] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0107] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above.

[0108] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A lightning surge protection control method based on an outdoor power supply, characterized in that: include: Obtaining a surge instantaneous voltage when an outdoor power supply is struck by lightning, and when the surge instantaneous voltage exceeds a front-end voltage peak value of the outdoor power supply, grounding an access end of the surge instantaneous voltage; Obtaining the interference voltage caused by the surge voltage grounding process to the external line of the outdoor power supply, and calculating the surge coupling inductance caused by the surge instantaneous voltage and the interference voltage to the outdoor power supply; Calculate the steady-state operating inductance of the outdoor power supply under normal working conditions, and calculate the differential mode inductance of the outdoor power supply under lightning surge according to the steady-state operating inductance and the surge coupling inductance in combination with the surge impact frequency of the outdoor power supply; The excitation impedance of the voltage transformer of the outdoor power supply is adjusted according to the differential mode inductor, the surge interference voltage of the outdoor power supply during the voltage conversion process is isolated, and the lightning surge protection data of the outdoor power supply is obtained.

2. The lightning surge protection control method based on outdoor power supply according to claim 1 is characterized in that: The excitation impedance of the voltage transformer of the outdoor power supply is adjusted according to the differential mode inductance, the surge interference voltage of the outdoor power supply during the voltage conversion process is isolated, and the lightning surge protection data of the outdoor power supply is obtained, which specifically includes: Calculating a surge magnetic flux change value at the input end of the outdoor power supply according to the differential mode inductance, and determining whether a single change of the surge magnetic flux exceeds a saturation magnetic flux of the voltage transformer; If yes, then a supplementary impedance value corresponding to the surge magnetic flux exceeding the saturation magnetic flux is calculated, and excitation compensation processing is performed on the input end of the voltage transformer according to the supplementary impedance value to obtain primary excitation adjustment data of the voltage transformer; According to the primary excitation adjustment data, the surge interference voltage of the outdoor power supply during the voltage conversion process is isolated to obtain the lightning surge protection data of the outdoor power supply.

3. The lightning surge protection control method based on outdoor power supply according to claim 2 is characterized in that: The step of adjusting the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductance, isolating the surge interference voltage of the outdoor power supply during the voltage conversion process, and obtaining the lightning surge protection data of the outdoor power supply further includes: Calculating the residual magnetism after excitation compensation at the input end of the voltage transformer, adjusting the excitation impedance at the output end of the voltage transformer according to the residual magnetism, and obtaining secondary excitation adjustment data of the voltage transformer; According to the primary excitation adjustment data and the secondary excitation adjustment data, voltage isolation processing is performed on the surge interference voltage of the outdoor power supply during the voltage conversion process to obtain lightning surge protection data of the outdoor power supply.

4. The lightning surge protection control method based on outdoor power supply according to claim 1 is characterized in that: The step of calculating the steady-state operating inductance of the outdoor power supply under normal working conditions, combining the surge impact frequency of the outdoor power supply, and calculating the differential mode inductance of the outdoor power supply under a lightning surge according to the steady-state operating inductance and the surge coupling inductance specifically includes: The differential mode inductance of the outdoor power supply under lightning surge is calculated by formula (1), which is as follows: Among them, L (差) Indicates the differential mode inductance of the outdoor power supply under lightning surge, U p Indicates the surge peak voltage, U c Indicates the steady-state operating voltage of the outdoor power supply, L (耦) , L (稳) Respectively represent the surge coupling inductance and steady-state operation inductance, It represents the derivative of the operating current of the outdoor power supply with respect to time, and is used to represent the current change under surge impact, f 运 、f 浪 They respectively represent the inductance conversion frequency of the outdoor power supply under normal working conditions and the surge impact frequency under lightning strike conditions.

5. The lightning surge protection control method based on outdoor power supply according to claim 1 is characterized in that: The obtaining of the interference voltage caused to the external line of the outdoor power supply after the surge voltage grounding process, and the calculation of the surge instantaneous voltage and the surge coupling inductance caused to the outdoor power supply by the interference voltage specifically include: The surge coupling inductance caused by the surge transient voltage and interference voltage on the outdoor power supply is calculated by formula (2). Formula (1) is as follows: Among them, L (耦) represents the surge coupling inductance of the outdoor power supply, A represents the propagation coefficient of the soil medium where the outdoor power supply is located, U 扰 Indicates the interference voltage, U 扰 =U 瞬 -U 峰 , t represents the current change time of the outdoor power supply under the current surge impact, τ1 and τ2 represent the pulse width of the surge transient voltage and the common-mode surge pulse width generated by the superposition of the interference voltage and the surge transient voltage, respectively. It represents the time derivative of the current change under surge impact.

6. A lightning surge protection control system based on an outdoor power supply, characterized in that: The system is applied to the lightning surge protection control method based on an outdoor power supply according to any one of claims 1 to 5 above, and the system comprises: A data acquisition module is used to acquire a surge instantaneous voltage when an outdoor power supply is struck by lightning, and when the surge instantaneous voltage exceeds a front-end voltage peak value of the outdoor power supply, a grounding treatment is performed on an access end of the surge instantaneous voltage; A data calculation module, used for obtaining the interference voltage caused to the external line of the outdoor power supply after the surge voltage grounding treatment, and calculating the surge instantaneous voltage and the surge coupling inductance caused by the interference voltage to the outdoor power supply; A data processing module is used to calculate the steady-state operating inductance of the outdoor power supply under normal working conditions, and to calculate the differential mode inductance of the outdoor power supply under lightning surge according to the steady-state operating inductance and the surge coupling inductance in combination with the surge impact frequency of the outdoor power supply; The surge protection module is used to adjust the excitation impedance of the voltage transformer of the outdoor power supply according to the differential mode inductance, isolate the surge interference voltage during the voltage conversion process of the outdoor power supply, and obtain the lightning surge protection data of the outdoor power supply.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the lightning surge protection control method based on an outdoor power supply as described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the lightning surge protection control method based on an outdoor power supply are implemented as described in any one of claims 1 to 5.

Images