A selection method and system of a controllable surge arrester

Abstract

The application discloses a selection method and system of controllable arrester, comprising: installing controllable arrester at the entrance of the line in the station, obtaining overvoltage data and flashover rate data of different line lengths and different controllable ratios of the extra-high voltage line when the controllable arrester is applied; determining the first controllable ratio range corresponding to different line lengths which meet the preset overvoltage requirement and the preset flashover rate requirement based on the overvoltage data and the flashover rate data; determining the fixed element energy consumption data of the fixed element when the line occurs single-phase ground fault in the normal closing condition and closing based on different controllable ratios corresponding to different line lengths based on the first controllable ratio range; calculating the energy tolerance of the fixed element of the controllable arrester under different controllable ratios, and determining the energy margin based on the energy consumption data and the energy tolerance; determining the second controllable ratio range corresponding to different line lengths based on the energy margin, so as to select the controllable arrester based on the second controllable ratio range.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arresters, and more particularly, to a method and system for selecting a controllable lightning arrester. Background Art

[0002] In the new energy transmission system, the controllable lightning arrester technology is a new technology for limiting switching overvoltage, which can deeply reduce the switching overvoltage, eliminate the circuit breaker closing resistance, and improve the economic efficiency and technical reliability of the new energy project. Figure 1 As shown in the figure, the arrester body is divided into a fixed element MOA1 and a controlled element MOA2. K is a control switch. MOA2 is connected in parallel with K. By controlling the opening and closing of K, the volt-ampere characteristics of the arrester are dynamically adjusted. Figure 2 as shown in (a) and (b).

[0003] The operating principle of the controllable lightning arrester is as follows: (1) Under operating overvoltage, K is closed, MOA2 is short-circuited, and the residual voltage of MOA1 is low, which can significantly reduce the system operating overvoltage. (2) Under system continuous operating voltage, temporary overvoltage, and lightning overvoltage, K is opened, and MOA2 and MOA1 share the system continuous operating voltage, temporary overvoltage, and lightning overvoltage.

[0004] The controllability ratio is a key parameter for the effectiveness of a controlled lightning arrester. It refers to the ratio of the rated voltage of the controlled element, MOA2, to the rated voltage of the arrester itself (including MOA1 and MOA2). The higher the controllability ratio, the better the controlled lightning arrester's ability to limit overvoltage.

[0005] However, the controllability ratio cannot be too large, otherwise the transient thermal stability of the arrester's fixed components will not meet the requirements and the arrester will be damaged. Therefore, it is crucial to determine the range of the controllability ratio. Summary of the Invention

[0006] The present invention proposes a method and system for selecting a controllable lightning arrester to solve the problem of how to determine a controllable lightning arrester that takes into account both the limiting effect of the controllable lightning arrester on the operating overvoltage of a new energy transmission system and the transient thermal stability of the lightning arrester.

[0007] In order to solve the above problem, according to one aspect of the present invention, a method for selecting a controllable lightning arrester is provided, the method comprising:

[0008] Install controllable lightning arresters at the line entrances within the station to obtain overvoltage and flashover rate data for UHV lines at different line lengths and controllability ratios when using controllable lightning arresters.

[0009] Determining, based on the overvoltage data and the flashover rate data, a first controllable ratio range corresponding to different line lengths that simultaneously meet a preset overvoltage requirement and a preset flashover rate requirement;

[0010] Based on the first controllable ratio range, determining energy consumption data of the fixed components of the controllable lightning arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing at different controllable ratios corresponding to different line lengths;

[0011] Calculating the energy tolerance of the fixed components of the controllable lightning arrester under different controllability ratios, and determining the energy margin based on the energy consumption data and the energy tolerance;

[0012] Based on the energy margin, a second controllable ratio range corresponding to different line lengths is determined, so as to select a controllable lightning arrester based on the second controllable ratio range.

[0013] Preferably, the preset overvoltage requirement is that the minimum air gap requirement value for the operating overvoltage is 6.0m; the preset flashover rate requirement is that the line flashover rate during each operation does not exceed 0.002 times / year.

[0014] Preferably, the method calculates the energy tolerance of the fixed element of the controllable lightning arrester in the following manner, including:

[0015]

[0016] Among them, W MOA1max is the energy tolerance of the fixed component; w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

[0017] Preferably, the selection of the controllable arrester based on the second controllable ratio range includes:

[0018] When the line length is less than or equal to 250km, a controllable arrester with a controllable ratio of 15% is selected;

[0019] When the line length is greater than 250km and less than or equal to 300km, a controllable arrester with a controllable ratio of (15%, 17%) is selected;

[0020] When the line length is greater than 300km and less than or equal to 350km, a controllable arrester with a controllable ratio of (17%, 20%) is selected;

[0021] When the line length is greater than 350 km and less than or equal to 400 km, a controllable lightning arrester with a controllable ratio of (20%, 25%) is selected.

[0022] According to another aspect of the present invention, a system for selecting a controllable lightning arrester is provided, the system comprising:

[0023] Overvoltage and flashover rate data acquisition unit, used to install controllable lightning arresters at the line entrance of the station, and obtain overvoltage and flashover rate data of UHV lines under different line lengths and different controllability ratios when controllable lightning arresters are used;

[0024] a first controllable ratio range determining unit, configured to determine, based on the overvoltage data and the flashover rate data, first controllable ratio ranges corresponding to different line lengths that simultaneously meet a preset overvoltage requirement and a preset flashover rate requirement;

[0025] an energy consumption data determining unit, configured to determine, based on the first controllable ratio range, energy consumption data of fixed elements of the controllable lightning arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing, at different controllable ratios corresponding to different line lengths;

[0026] an energy tolerance determination unit, configured to calculate the energy tolerance of the fixed components of the controllable arrester under different controllable ratios, and determine the energy margin based on the energy consumption data and the energy tolerance;

[0027] The selection unit is configured to determine, based on the energy margin, a second controllable ratio range corresponding to different line lengths, so as to select a controllable lightning arrester based on the second controllable ratio range.

[0028] Preferably, the preset overvoltage requirement is that the minimum air gap requirement value for the operating overvoltage is 6.0m; the preset flashover rate requirement is that the line flashover rate during each operation does not exceed 0.002 times / year.

[0029] Preferably, the energy tolerance determination unit calculates the energy tolerance of the fixed element of the controllable lightning arrester in the following manner, including:

[0030]

[0031] Among them, W MOA1max is the energy tolerance of the fixed component; w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

[0032] Preferably, the selection of the controllable arrester based on the second controllable ratio range includes:

[0033] When the line length is less than or equal to 250km, a controllable arrester with a controllable ratio of 15% is selected;

[0034] When the line length is greater than 250km and less than or equal to 300km, a controllable arrester with a controllable ratio of (15%, 17%) is selected;

[0035] When the line length is greater than 300km and less than or equal to 350km, a controllable arrester with a controllable ratio of (17%, 20%) is selected;

[0036] When the line length is greater than 350 km and less than or equal to 400 km, a controllable lightning arrester with a controllable ratio of (20%, 25%) is selected.

[0037] According to another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements any step of a method for selecting a controllable lightning arrester when the program is executed by a processor.

[0038] According to another aspect of the present invention, the present invention provides an electronic device, including:

[0039] The computer-readable storage medium described above; and

[0040] One or more processors are configured to execute the program in the computer-readable storage medium.

[0041] The present invention provides a method and system for selecting a controllable lightning arrester, comprising: installing a controllable lightning arrester at an inlet of an intra-station line, obtaining overvoltage data and flashover rate data of an ultra-high voltage line under different line lengths and different controllable ratios when the controllable lightning arrester is applied; determining, based on the overvoltage data and flashover rate data, a first controllable ratio range corresponding to different line lengths that simultaneously meets preset overvoltage requirements and preset flashover rate requirements; determining, based on the first controllable ratio range, energy consumption data of fixed elements of the controllable lightning arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing at different controllable ratios corresponding to different line lengths; calculating the energy tolerance of the fixed elements of the controllable lightning arrester under different controllable ratios, and determining an energy margin based on the energy consumption data and the energy tolerance; determining, based on the energy margin, a second controllable ratio range corresponding to different line lengths, so as to select the controllable lightning arrester based on the second controllable ratio range. The present invention can select a suitable controllable ratio for the controllable lightning arrester, which can not only ensure the limiting effect of the controllable lightning arrester on the operating overvoltage of the new energy transmission system, but also ensure the transient thermal stability of the lightning arrester, thereby ensuring the operational safety of the lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0043] Figure 1 It is a structural diagram of a controllable lightning arrester;

[0044] Figure 2 (a) and (b) are schematic diagrams of the arrester's volt-ampere characteristics before and after the control switch is actuated;

[0045] Figure 3 A schematic flow chart of a method 300 for selecting a controllable lightning arrester according to an embodiment of the present invention;

[0046] Figure 4 A schematic diagram of typical UHV system wiring and controllable lightning arrester installation according to an embodiment of the present invention;

[0047] Figure 5 Schematic diagram of overvoltage distribution along a 300km line at different controllable ratios according to an embodiment of the present invention;

[0048] Figure 6 Schematic diagram of overvoltage wave front time of a 300km line using a controllable lightning arrester according to an embodiment of the present invention;

[0049] Figure 7 Schematic diagram of overvoltage and arrester energy consumption according to an embodiment of the present invention;

[0050] Figure 8 FIG. 8 is a structural diagram of a controllable lightning arrester selection system 800 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0052] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0053] Figure 3 FIG. 3 is a flow chart of a method 300 for selecting a controllable lightning arrester according to an embodiment of the present invention. Figure 3As shown, the method for selecting a controllable lightning arrester provided in an embodiment of the present invention can select a suitable controllability ratio for the controllable lightning arrester, which can not only ensure the controllable lightning arrester's limiting effect on the operating overvoltage of the new energy transmission system, but also ensure the transient thermal stability of the lightning arrester, thereby ensuring the operational safety of the lightning arrester. The method 300 for selecting a controllable lightning arrester provided in an embodiment of the present invention starts from step 301. In step 301, a controllable lightning arrester is installed at the line entrance of the station, and overvoltage data and flashover rate data of the ultra-high voltage line under different line lengths and different controllability ratios when the controllable lightning arrester is applied are obtained.

[0054] In step 302 , based on the overvoltage data and the flashover rate data, a first controllable ratio range corresponding to different line lengths that simultaneously meet a preset overvoltage requirement and a preset flashover rate requirement is determined.

[0055] Preferably, the preset overvoltage requirement is that the minimum air gap requirement value for the operating overvoltage is 6.0m; the preset flashover rate requirement is that the line flashover rate during each operation does not exceed 0.002 times / year.

[0056] In the present invention, Figure 4 Taking the renewable energy transmission system shown in Figure 1 as an example, the effectiveness of controllable surge arresters in limiting operational overvoltages in this system was studied. The line under study is a double-circuit line with two UHV outgoing lines at both the headend and the terminal, both connected to the 500kV system via transformers. Controllable surge arresters were installed at the line entrances at both the headend and the terminal.

[0057] In this invention, the UHV transmission line adopts a double-circuit transmission line on the same tower. The line length is considered to be from 150km to 400km. The high-voltage reactor configuration is considered to take into account the typical compensation degree. The high-voltage reactor configuration for different line lengths is shown in Table 1.

[0058] Table 1 Line length and high impedance configuration

[0059]

[0060] This study investigates the effect of controlled lightning arresters on the amplitude of overvoltage during closing operations. Table 2 shows the overvoltage calculation results for different line lengths, when the circuit breaker is not equipped with a closing resistor, and when a conventional arrester is used, and when a controlled arrester with a controllable ratio of 10% and 15%, respectively, is used. Table 2 shows that the closing overvoltage is lower with the controlled arrester than with the conventional arrester. The shorter the line, the more effective the controlled arrester is in limiting overvoltage. The higher the controllable ratio, the better the overvoltage limiting effect.

[0061] When the line length is 200 km, the use of controllable arresters with a controllability ratio of 10% or 15% can limit the closing overvoltage to within 1.7 pu. When the line length reaches 300 km or more, the overvoltage is still high even with the use of controllable arresters with a controllability ratio of 10% or 15%, exceeding 1.7 pu.

[0062] Table 2 Closing overvoltage after applying controllable lightning arrester

[0063]

[0064] Taking a 300km line as an example, Figure 5 The overvoltage distribution along the line when different lightning arresters are used is given. It can be seen that the overvoltage level along the line is significantly reduced after the controllable lightning arrester is used.

[0065] This paper studies the influence of controllable lightning arrester on the overvoltage wavefront time of closing operation. When a controllable lightning arrester is used, the circuit breaker will be affected by the overvoltage wavefront time without installing a closing resistor. Taking a 300km line as an example, Figure 6 The time distribution of the overvoltage wavefront in a line with a controllable lightning arrester and no closing resistor in the circuit breaker is shown. It can be seen that for high overvoltage conditions, the wavefront time is 500μs or less, with a minimum of approximately 400μs.

[0066] The voltage front time during UHV line switching impulse tests significantly impacts the discharge voltage across the tower air gap, directly influencing tower head dimensions. Domestic and international testing of tower air gaps using switching impulses indicates that the longer the peak time of the switching impulse wave generated by the impulse generator increases, the higher the discharge voltage across the air gap, a phenomenon known as a U-shaped curve. The relative-to-ground switching overvoltage level of a line generally depends on the operation of closing an unloaded line. When UHV line circuit breakers utilize closing resistors, the switching overvoltage wave front time generated by closing an unloaded line is significantly longer than the standard operating wave (250 / 2500μs). Existing UHV projects all use a 1000μs switching impulse wave as the test voltage. With the elimination of closing resistors using controllable lightning arresters, the shorter wave front time necessitates the use of 250μs standard operating wave test data as the basis for insulation coordination.

[0067] In the present invention, after applying a controllable lightning arrester and eliminating the closing resistor, the overvoltage should meet standard control requirements. According to the national standard GB / Z 24842-2018, "Overvoltage and Insulation Coordination for 1000kV UHV AC Transmission and Transformation Projects," the average operating overvoltage flashover rate of UHV lines should be no higher than 0.01 times / year. For double-circuit lines on the same tower using I strings at altitudes of 500m or less, the minimum operating overvoltage air gap requirement is 6.0m. For stricter considerations, the gap dimensions of the lines in this study were considered based on the above values. Based on the results of overvoltage characteristic research, the overvoltage wavefront time is shorter than when closing resistors are used. Therefore, the flashover rate calculation uses operating impulse test data with a wavefront time of 250us. The 50% discharge voltage under the gap, U50%, is 1845kV (wavefront time 250μs), and the coefficient of variation is considered to be 0.05. Considering the annual number of operations is 5 or less, the line flashover rate during each operation should not exceed 0.002 times / year.

[0068] Table 1 shows the calculation results of overvoltage and flashover rate under different line lengths and different controllable arrester controllability ratios after the application of controllable arresters. It can be seen from the calculation results that for lines within 250km in length, a controllable arrester with a 15% controllability ratio is used, and the overvoltage and flashover rate meet the requirements; for lines within 250-300km in length, a controllable ratio of 15%-17% can be used, and the overvoltage and flashover rate meet the requirements; for lines within 300-350km in length, a controllable arrester with a 17%-20% controllability ratio is used, and the overvoltage and flashover rate meet the requirements; for lines within 350-400km in length, a controllable arrester with a 20%-25% controllability ratio is used, and the overvoltage and flashover rate meet the requirements.

[0069] In step 303, based on the first controllable ratio range, energy consumption data of fixed elements of the controllable arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing are determined for different controllable ratios corresponding to different line lengths.

[0070] In step 304, the energy tolerance of the fixed components of the controllable arrester under different controllable ratios is calculated, and the energy margin is determined based on the energy consumption data and the energy tolerance.

[0071] Preferably, the method calculates the energy tolerance of the fixed element of the controllable lightning arrester in the following manner, including:

[0072]

[0073] Among them, W MOA1max is the energy tolerance of the fixed component; w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

[0074] In this paper, the energy consumption of the arrester's fixed unit under different operating conditions is also obtained, as shown in Table 3. This analysis primarily considers normal closing conditions and conditions where a single-phase grounding fault occurs during closing. Under normal conditions, the maximum energy consumption of the fixed unit is 5.4 MJ under different controllable ratios. Considering fault conditions, the maximum energy consumption of the fixed unit under different controllable ratios is 10.9 MJ. Figure 7 Typical waveforms of overvoltage and arrester energy consumption under positive closing conditions are shown. It can be seen that arrester energy consumption accumulates primarily during the period when the fixed components are subjected to operational overvoltage. After the transient process of the closing operation, the fixed components must withstand power-frequency voltage for a certain period of time. Under normal closing conditions, the system voltage after closing is generally controlled within 1090 kV. During this period, the power-frequency voltage withstood by the fixed components is generally less than 1 p.u., and the duration of the power-frequency voltage action is determined by the control strategy.

[0075] Table 3 Substation overvoltage, line flashover rate and fixed component energy consumption under different controllability ratios

[0076]

[0077]

[0078] In the present invention, the transient energy tolerance and energy margin of the fixed components of the arrester are calculated using the following method. The method for calculating the energy tolerance of the fixed components is:

[0079]

[0080] Where: w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

[0081] For UHV arresters, w can be 300 J / cm³, the resistor diameter can be 10 cm, the height can be 2.2 cm, m can be 216, n can be 4, and r can be 1.1. The UHV controllable arrester's main energy withstand capability is 40 MJ. Table 4 shows the energy withstand capability and energy margin of the controllable arrester's fixed components at different controllability ratios. As can be seen from Table 4, for the selected controllability ratios, both the energy withstand capability and energy margin of the fixed components meet the requirements.

[0082] Table 4 Energy margin of fixed components of controllable arrester with different controllability ratios

[0083]

[0084] In step 305 , based on the energy margin, a second controllable ratio range corresponding to different line lengths is determined, so as to select a controllable lightning arrester based on the second controllable ratio range.

[0085] Preferably, the selection of the controllable arrester based on the second controllable ratio range includes:

[0086] When the line length is less than or equal to 250km, a controllable arrester with a controllable ratio of 15% is selected;

[0087] When the line length is greater than 250km and less than or equal to 300km, a controllable arrester with a controllable ratio of (15%, 17%) is selected;

[0088] When the line length is greater than 300km and less than or equal to 350km, a controllable arrester with a controllable ratio of (17%, 20%) is selected;

[0089] When the line length is greater than 350 km and less than or equal to 400 km, a controllable lightning arrester with a controllable ratio of (20%, 25%) is selected.

[0090] Combined with the contents of Table 4, it can be concluded that after the closing resistor is eliminated, the switching overvoltage can be limited to the range required by the standard by simply installing a controllable lightning arrester at the line entrance in the station. Among them, when the line length is ≤250km, a controllable lightning arrester with a controllable ratio of 15% is adopted; when the line length is (250,300]km, a controllable lightning arrester with a controllable ratio of (15%, 17%] is adopted; when the line length is (300,350]km, a controllable lightning arrester with a controllable ratio of (17%, 20%] is adopted; when the line length is (350,400]km, a controllable lightning arrester with a controllable ratio of (20%, 25%] is adopted.

[0091] Table 5 Applicability of controllable lightning arresters in subsequent UHV AC projects

[0092] UHV project line length L / km Controllable arrester controllable ratio selection ≤250 15％ 250～300 15％～17％ 300～350 17％～20％ 350～400 20％～25％

[0093] In the present invention, based on the calculation results and combined with the conditions of existing and under-construction UHV AC engineering projects, the UHV AC line length and its controllable lightning arrester voltage limiting scheme are given in Table 6.

[0094] Table 6 UHV system conditions and voltage limiting scheme for controllable lightning arresters

[0095]

[0096]

[0097] In addition, with the approval and construction of subsequent UHV AC projects, projects that can adopt switch-type controllable lightning arrester technology are shown in Table 7.

[0098] Table 7 Applicability of controllable lightning arresters in subsequent UHV AC projects

[0099] UHV project name Line length L / km Controllable lightning arrester Beijing West-Shijiazhuang 219 15% controllable lightning arrester Heze-Zaozhuang 225 15% controllable lightning arrester Inner Mongolia-Jinzhong 300 17% controllable lightning arrester

[0100] Figure 8 FIG. 8 is a schematic structural diagram of a controllable lightning arrester selection system 800 according to an embodiment of the present invention. Figure 8 As shown, the controllable lightning arrester selection system 800 provided in an embodiment of the present invention includes: an overvoltage and flashover rate data acquisition unit 801, a first controllable ratio range determination unit 802, an energy consumption data determination unit 803, an energy tolerance determination unit 804 and a selection unit 805.

[0101] Preferably, the overvoltage and flashover rate data acquisition unit 801 is used to install a controllable lightning arrester at the line entrance in the station, and obtain overvoltage data and flashover rate data of the ultra-high voltage line under different line lengths and different controllability ratios when the controllable lightning arrester is applied.

[0102] Preferably, the first controllable ratio range determining unit 802 is configured to determine, based on the overvoltage data and the flashover rate data, a first controllable ratio range corresponding to different line lengths that simultaneously meet preset overvoltage requirements and preset flashover rate requirements.

[0103] Preferably, the preset overvoltage requirement is that the minimum air gap requirement value for the operating overvoltage is 6.0m; the preset flashover rate requirement is that the line flashover rate during each operation does not exceed 0.002 times / year.

[0104] Preferably, the energy consumption data determination unit 803 is used to determine, based on the first controllable ratio range, the energy consumption data of the fixed elements of the controllable lightning arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing at different controllable ratios corresponding to different line lengths.

[0105] Preferably, the energy tolerance determination unit 804 is configured to calculate the energy tolerance of the fixed components of the controllable lightning arrester under different controllability ratios, and determine the energy margin based on the energy consumption data and the energy tolerance.

[0106] Preferably, the energy tolerance determination unit 804 calculates the energy tolerance of the fixed element of the controllable lightning arrester in the following manner, including:

[0107]

[0108] Among them, W MOA1max is the energy tolerance of the fixed component; w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

[0109] Preferably, the selection unit 805 is configured to determine a second controllable ratio range corresponding to different line lengths based on the energy margin, so as to select a controllable lightning arrester based on the second controllable ratio range.

[0110] Preferably, the selection of the controllable arrester based on the second controllable ratio range includes:

[0111] When the line length is less than or equal to 250km, a controllable arrester with a controllable ratio of 15% is selected;

[0112] When the line length is greater than 250km and less than or equal to 300km, a controllable arrester with a controllable ratio of (15%, 17%) is selected;

[0113] When the line length is greater than 300km and less than or equal to 350km, a controllable arrester with a controllable ratio of (17%, 20%) is selected;

[0114] When the line length is greater than 350 km and less than or equal to 400 km, a controllable lightning arrester with a controllable ratio of (20%, 25%) is selected.

[0115] The controllable lightning arrester selection system 800 of the embodiment of the present invention corresponds to the controllable lightning arrester selection method 300 of another embodiment of the present invention, and will not be described in detail here.

[0116] According to another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements any step of a method for selecting a controllable lightning arrester when the program is executed by a processor.

[0117] According to another aspect of the present invention, the present invention provides an electronic device, including:

[0118] The computer-readable storage medium described above; and

[0119] One or more processors are configured to execute the program in the computer-readable storage medium.

[0120] The present invention has been described with reference to a few embodiments. However, it is apparent to those skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the present invention.

[0121] Generally, all terms used in this disclosure are to be interpreted according to their ordinary meaning in the art, unless explicitly defined otherwise herein. All references to "a / the / the [device, component, etc.]" are to be interpreted openly as referring to at least one instance of the device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily need to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0122] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0123] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0124] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0125] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for selecting a controllable lightning arrester, characterized in that: The method comprises: Install controllable lightning arresters at the line entrances within the station to obtain overvoltage and flashover rate data for UHV lines at different line lengths and controllability ratios when using controllable lightning arresters. Determining, based on the overvoltage data and the flashover rate data, a first controllable ratio range corresponding to different line lengths that simultaneously meet a preset overvoltage requirement and a preset flashover rate requirement; Based on the first controllable ratio range, determining energy consumption data of the fixed components of the controllable lightning arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing at different controllable ratios corresponding to different line lengths; Calculating the energy tolerance of the fixed components of the controllable lightning arrester under different controllability ratios, and determining the energy margin based on the energy consumption data and the energy tolerance; determining, based on the energy margin, a second controllable ratio range corresponding to different line lengths, so as to select a controllable lightning arrester based on the second controllable ratio range; The method calculates the energy tolerance of the fixed element of the controllable lightning arrester in the following manner, including: Among them, W MOA1max is the energy tolerance of the fixed component; w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

2. The method according to claim 1, characterized in that The preset overvoltage requirement is that the minimum air gap requirement for operating overvoltage is 6.0m; the preset flashover rate requirement is that the line flashover rate during each operation does not exceed 0.002 times / year.

3. The method according to claim 1, characterized in that The selecting of the controllable lightning arrester based on the second controllable ratio range includes: When the line length is less than or equal to 250km, a controllable arrester with a controllable ratio of 15% is selected; When the line length is greater than 250km and less than or equal to 300km, a controllable arrester with a controllable ratio of (15%, 17%) is selected; When the line length is greater than 300km and less than or equal to 350km, a controllable arrester with a controllable ratio of (17%, 20%) is selected; When the line length is greater than 350 km and less than or equal to 400 km, a controllable lightning arrester with a controllable ratio of (20%, 25%) is selected.

4. A controllable lightning arrester selection system, characterized in that: The system comprises: Overvoltage and flashover rate data acquisition unit, used to install controllable lightning arresters at the line entrance of the station, and obtain overvoltage and flashover rate data of UHV lines under different line lengths and different controllability ratios when controllable lightning arresters are used; a first controllable ratio range determining unit, configured to determine, based on the overvoltage data and the flashover rate data, first controllable ratio ranges corresponding to different line lengths that simultaneously meet a preset overvoltage requirement and a preset flashover rate requirement; an energy consumption data determining unit, configured to determine, based on the first controllable ratio range, energy consumption data of fixed elements of the controllable lightning arrester under normal closing conditions and when a single-phase grounding fault occurs in the line during closing, at different controllable ratios corresponding to different line lengths; an energy tolerance determination unit, configured to calculate the energy tolerance of the fixed components of the controllable arrester under different controllable ratios, and determine the energy margin based on the energy consumption data and the energy tolerance; A selection unit, configured to determine, based on the energy margin, a second controllable ratio range corresponding to different line lengths, so as to select a controllable lightning arrester based on the second controllable ratio range; The energy tolerance determination unit calculates the energy tolerance of the fixed element of the controllable lightning arrester in the following manner, including: Among them, W MOA1max is the energy tolerance of the fixed component; w is the energy absorption capacity of the resistor per unit volume, v is the volume of the resistor, m is the number of resistors in series, n is the number of resistors in parallel, and γ is the current distribution unevenness coefficient.

5. The system according to claim 4, characterized in that The preset overvoltage requirement is that the minimum air gap requirement for operating overvoltage is 6.0m; the preset flashover rate requirement is that the line flashover rate during each operation does not exceed 0.002 times / year.

6. The system according to claim 4, characterized in that The selecting of the controllable lightning arrester based on the second controllable ratio range includes: When the line length is less than or equal to 250km, a controllable arrester with a controllable ratio of 15% is selected; When the line length is greater than 250km and less than or equal to 300km, a controllable arrester with a controllable ratio of (15%, 17%) is selected; When the line length is greater than 300km and less than or equal to 350km, a controllable arrester with a controllable ratio of (17%, 20%) is selected; When the line length is greater than 350 km and less than or equal to 400 km, a controllable lightning arrester with a controllable ratio of (20%, 25%) is selected.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

8. An electronic device, characterized in that: include: The computer-readable storage medium of claim 7; as well as One or more processors are configured to execute the program in the computer-readable storage medium.

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