A method and system for calculating the equivalent continuous operating voltage of a lightning arrester resistor

Abstract

The present invention discloses a method and system for calculating the equivalent continuous operating voltage of a lightning arrester resistor. The method forms a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages through the steady-state voltage harmonic spectrum of the lightning arrester of an AC filter, determines the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester, and draws a voltage peak time distribution diagram of the resistor under the main frequency harmonics. The voltage peaks under the main frequency harmonics are applied to the resistors in the lightning arrester in sequence to obtain the total test power consumption generated by the voltage peaks under the main frequency harmonics on the resistors. When a power frequency voltage is applied to the resistors and the amplitude of the power frequency voltage is adjusted until the actual power consumption of the resistors reaches the total test power consumption, the corresponding power frequency voltage is determined to be the equivalent continuous operating voltage of the resistors in the lightning arrester. Thus, only a single-frequency voltage generator is required to generate the corresponding equivalent continuous operating voltage waveform, thereby improving the accuracy of long-term stability verification.

Description

Technical Field

[0001] The present invention relates to the technical field of power lightning arresters, and in particular to a method and system for calculating the equivalent continuous operating voltage of a lightning arrester resistor. Background Art

[0002] For conventional DC projects using thyristor commutated valves (LCCs), a large number of AC filter groups are usually required to be installed on the AC side, such as Figure 1 As shown, Figure 1 The AC filter configuration structure for a DC project is shown in Figure 1. The AC 500kV busbar is equipped with 4 large groups and 15 small groups of AC filters. The AC filters are divided into three types: A, B, and C. The structure of each type is as follows: Figure 1 As shown, C is a capacitor, L is a reactor, R is a resistor, and Fac is a lightning arrester.

[0003] The arrester in an AC filter bank protects low-voltage components. A reasonable AC filter bank arrester configuration must ensure both the arrester's stability during long-term operation and sufficient protection against transient overvoltages (meeting the required residual voltage and through-current energy levels). During long-term operation, the arrester must withstand the harmonic voltage across the AC filter components. This voltage consists of multiple harmonic components, with harmonic frequencies typically concentrated between the 2nd and 50th harmonics.

[0004] In order to verify the thermal stability of the lightning arrester under long-term operating voltage, a long-term stability test is required in the lightning arrester type test. During the test, the lightning arrester resistor is heated to 115°C, and a long-term operating voltage is applied between the resistor ends for 1000 hours. The power consumption on the resistor during the test is measured, and the power consumption time curve is obtained to determine whether the long-term operating voltage test is passed.

[0005] Currently, due to technical limitations of test power supplies, arresters can only use AC power frequency or DC voltage waveforms in long-term operating voltage tests. Therefore, long-term stability test data for each resistor under AC / DC conditions is readily available. Currently, resistors from mainstream domestic arrester manufacturers all demonstrate long-term operating stability under an AC power frequency charge factor of 0.95. However, for arresters used in filters, the long-term stability of the arrester resistors must be verified under the superposition of multiple harmonic voltages. Because their long-term operating voltages contain multiple harmonic components, it is difficult for the test power supply to generate the corresponding equivalent continuous operating voltage waveform, resulting in poor accuracy in long-term stability verification and a high risk of misjudgment. Summary of the Invention

[0006] The present invention provides a method and system for calculating the equivalent continuous operating voltage of a lightning arrester resistor, which solves the technical problem that when verifying the long-term stability of a lightning arrester resistor under the superposition of multiple harmonic voltages, a test power supply is difficult to generate a corresponding equivalent continuous operating voltage waveform, resulting in poor long-term stability verification accuracy and easy misjudgment.

[0007] In view of this, a first aspect of the present invention provides a method for calculating the equivalent continuous operating voltage of a lightning arrester resistor, comprising the following steps:

[0008] According to the steady-state voltage harmonic spectrum of the arrester of the AC filter, a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages is formed;

[0009] Determining the voltage amplitude corresponding to each time point according to the harmonic voltage waveform diagram, and determining the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester;

[0010] Determine the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics;

[0011] Based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, the voltage peak under the main frequency harmonic is applied to the resistor in the lightning arrester in sequence, and the total test power consumption generated by the voltage peak under the main frequency harmonic on the resistor is obtained;

[0012] Apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

[0013] Preferably, the step of forming a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the arrester of the AC filter specifically includes:

[0014] Obtain the steady-state voltage harmonic spectrum information of the arrester of the AC filter;

[0015] According to the steady-state voltage harmonic spectrum information of the lightning arrester of the AC filter, the harmonic waveform signals corresponding to each harmonic voltage of the lightning arrester are determined by a cosine function, wherein the cosine function is:

[0016]

[0017] In the formula, y represents the voltage peak, A represents the harmonic voltage, represents the voltage amplitude, f represents the harmonic frequency, and t represents the time;

[0018] The harmonic waveform signals corresponding to each harmonic voltage of the lightning arrester are linearly superimposed, and the harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages is drawn according to the superposition results.

[0019] Preferably, the step of determining the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and drawing a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics specifically includes:

[0020] Determining the voltage amplitude of the resistor in the arrester under the main frequency harmonic according to the charge factor of the arrester and the reference voltage of the resistor in the arrester;

[0021] Dividing the voltage amplitude of a single resistor in the arrester under the main frequency harmonics into multiple step voltage ranges according to the amplitude ratio, and determining the voltage peak value and the time proportion occupied by each step voltage range;

[0022] A time-step distribution diagram of the voltage peak of the resistor under the main frequency harmonics is drawn according to the voltage peak of each step voltage range and the time proportion occupied by the voltage peak of each step voltage range of the single resistor in the lightning arrester under the main frequency harmonics.

[0023] Preferably, the step of applying the voltage peaks under the main frequency harmonics to the resistors in the arrester in sequence based on the voltage peak time distribution diagram of the resistors under the main frequency harmonics to obtain the total test power consumption generated by the voltage peaks under the main frequency harmonics on the resistors specifically includes:

[0024] Determine the voltage peak value within each step voltage range under the main frequency harmonics and the time proportion occupied by each step voltage range according to the voltage peak time distribution diagram under the main frequency harmonics of the resistor;

[0025] According to the time proportion of each step voltage range, the voltage peaks within each step voltage range under the main frequency harmonics are applied to the resistor in the arrester in sequence, and the power consumption generated by the voltage peaks within each step voltage range under the main frequency harmonics on the resistor is measured respectively. The total test power consumption is calculated by the following formula:

[0026]

[0027] Where P represents the total test power consumption, n represents the number of the step voltage range, a represents the number of step voltage ranges, and W n is the energy loss on the resistor caused by the voltage peak within the nth step voltage range, T is the power frequency period, P n is the power consumption measurement value generated on the resistor by the voltage peak within the nth step voltage range, t n It is the time value occupied by the nth step voltage range.

[0028] Preferably, before the step of determining the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and drawing a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics, the method further includes:

[0029] Determine the proportion of each harmonic voltage amplitude based on the steady-state voltage harmonic spectrum of the AC filter's lightning arrester;

[0030] The proportions of each harmonic voltage are compared, and the harmonic order with the highest proportion of harmonic voltage amplitude is selected as the main frequency harmonic.

[0031] Preferably, after the step of applying a power frequency voltage to the resistor and adjusting the amplitude of the power frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stopping adjusting the amplitude of the power frequency voltage and determining that the corresponding power frequency voltage is the equivalent continuous operating voltage of the resistor in the arrester, the method further includes:

[0032] Determining the equivalent charge factor of the resistor in the arrester according to the equivalent continuous operating voltage of the resistor in the arrester and the reference voltage of the resistor in the arrester;

[0033] The equivalent chargeability of the resistor in the arrester is compared with a preset maximum chargeability threshold. If the equivalent chargeability of the resistor in the arrester is greater than the preset maximum chargeability threshold, it is determined that the harmonic aging capability of the resistor in the arrester is poor.

[0034] In a second aspect, the present invention further provides a calculation system for the equivalent continuous operating voltage of a lightning arrester resistor, comprising:

[0035] A harmonic waveform drawing module is used to form a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the arrester of the AC filter;

[0036] a charge factor calculation module, configured to determine the voltage amplitude corresponding to each time point according to the harmonic voltage waveform diagram, and determine the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester;

[0037] A voltage distribution drawing module is used to determine the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics;

[0038] A test power consumption calculation module is used to apply the voltage peak value under the main frequency harmonic to the resistor in the lightning arrester in sequence based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, and obtain the total test power consumption generated by the voltage peak value under the main frequency harmonic on the resistor;

[0039] An operating voltage calculation module is used to apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

[0040] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor;

[0041] The memory is used to store programs;

[0042] The processor executes the program to implement the above method.

[0043] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0044] In a fifth aspect, the present invention further provides a computer program product comprising at least one computer-readable storage medium, wherein the computer-readable storage medium has computer-executable program code instructions stored therein, wherein the computer-executable program code comprises:

[0045] The first program code portion is configured to form a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the lightning arrester of the AC filter;

[0046] The second program code portion is configured to determine a voltage amplitude corresponding to each time point based on the harmonic voltage waveform diagram, and determine a charge factor of the lightning arrester based on the voltage amplitude and a reference voltage of the lightning arrester;

[0047] The third program code portion is configured to determine the voltage peak of the resistor in the lightning arrester based on the charge factor of the lightning arrester and the reference voltage of the resistor in the lightning arrester, and to draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics;

[0048] The fourth program code portion is configured to apply the voltage peak value under the main frequency harmonic to the resistor in the lightning arrester in sequence based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, and obtain the total test power consumption generated by the voltage peak value under the main frequency harmonic on the resistor;

[0049] The fifth program code portion is configured to apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

[0050] It can be seen from the above technical solutions that the present invention has the following advantages:

[0051] The present invention forms a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages through the steady-state voltage harmonic spectrum of the lightning arrester of the AC filter, determines the voltage amplitude corresponding to each time point, determines the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester, determines the voltage peak of the resistor in the lightning arrester according to the charge factor of the lightning arrester and the reference voltage of the resistor in the lightning arrester, draws a voltage peak time distribution diagram of the resistor under the main frequency harmonics, and based on this diagram, sequentially applies the voltage peak under the main frequency harmonics to the resistor in the lightning arrester to obtain the total test power consumption generated by the voltage peak under the main frequency harmonics on the resistor, applies the power frequency voltage to the resistor and adjusts the amplitude of the power frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, determines the corresponding power frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester, thereby only a single-frequency voltage generator is needed to generate the corresponding equivalent continuous operating voltage waveform and perform long-term stability testing on the lightning arrester resistor, thereby improving the accuracy of long-term stability verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A flowchart of a method for calculating the equivalent continuous operating voltage of a lightning arrester resistor provided by an embodiment of the present invention;

[0053] Figure 2 A harmonic voltage waveform diagram of the lightning arrester provided by an embodiment of the present invention under the superposition of multiple harmonic voltages;

[0054] Figure 3 A time-staircase distribution diagram of voltage peak value provided by an embodiment of the present invention;

[0055] Figure 4 A schematic diagram of the structure of a system for calculating the equivalent continuous operating voltage of a lightning arrester resistor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0057] Currently, due to technical limitations of test power supplies, arresters can only use AC power frequency or DC voltage waveforms in long-term operating voltage tests. Therefore, long-term stability test data for each resistor under AC / DC conditions is readily available. Currently, resistors from mainstream domestic arrester manufacturers all demonstrate long-term operating stability under an AC power frequency charge factor of 0.95. However, for arresters used in filters, the long-term stability of the arrester resistors must be verified under the superposition of multiple harmonic voltages. Because their long-term operating voltages contain multiple harmonic components, it is difficult for the test power supply to generate the corresponding equivalent continuous operating voltage waveform, resulting in poor accuracy in long-term stability verification and a high risk of misjudgment.

[0058] At the same time, in the design of the lightning arrester of the AC filter, a charge factor of 0.8 is generally selected for design, but it is difficult to verify through experiments the thermal stability of the lightning arrester when it is subjected to multiple harmonic voltages with a charge factor of 0.8.

[0059] The power loss of metal oxide resistors mainly takes three forms: 1) conductivity loss; 2) polarization loss; 3) loss caused by structural unevenness.

[0060] According to the principles of electrical engineering, the active power loss P of metal oxide resistor material under voltage is a for:

[0061]

[0062] Where 2πf a CU 2 tanσ is the polarization power loss, is the conductive power loss, C is the capacitance of the resistor, tanσ is the dielectric loss tangent, f a is the voltage frequency, U is the effective value of voltage, and R is the resistance value.

[0063] It can be seen that the polarization loss is related to the power supply frequency. Under the same voltage amplitude, under the action of high-frequency voltage, the power consumption of the resistor will be higher than that under the power frequency voltage.

[0064] For easier understanding, see Figure 1 The present invention provides a method for calculating the equivalent continuous operating voltage of a lightning arrester resistor, comprising the following steps:

[0065] S1. A harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages is formed based on the steady-state voltage harmonic spectrum of the arrester of the AC filter.

[0066] It should be noted that the continuous operating voltage of the arrester resistor is composed of a plurality of harmonics of different voltage amplitudes. In this embodiment, the phase angle between the harmonics of different voltage amplitudes is zero, and the total voltage amplitude is the linear sum of the harmonics of different voltage amplitudes.

[0067] Among them, the steady-state voltage harmonic spectrum of the AC filter's lightning arrester refers to the voltage harmonic spectrum of the AC filter's lightning arrester under steady-state operation, which contains voltage harmonic spectrum information. The voltage harmonic spectrum information includes voltage amplitude, harmonic voltage, harmonic frequency, time, period and other information.

[0068] Among them, the horizontal axis of the harmonic voltage waveform diagram is time, and the vertical axis is the voltage peak.

[0069] S2. Determine the voltage amplitude corresponding to each time point according to the harmonic voltage waveform diagram, and determine the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester.

[0070] The reference voltage of the arrester is preset, and the charge rate of the arrester can be calculated by dividing the voltage amplitude by the reference voltage of the arrester.

[0071] S3. Determine the voltage peak of the resistor in the arrester based on the charge rate of the arrester and the reference voltage of the resistor in the arrester, and draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics.

[0072] The reference voltage of a single resistor in the arrester can be preset. The peak voltage of the resistor in the arrester can be obtained by multiplying the reference voltage of the resistor in the arrester by the charge factor of the arrester.

[0073] Among them, the voltage peak time distribution diagram of the resistor under the main frequency harmonics refers to the distribution of the voltage peak and the time proportion it occupies, the horizontal axis is the time proportion occupied by the voltage peak, and the vertical axis is the voltage peak.

[0074] S4. Based on the voltage peak time distribution diagram of the resistor under the main frequency harmonics, the voltage peak under the main frequency harmonics is applied to the resistor in the lightning arrester in sequence to obtain the total test power consumption generated by the voltage peak under the main frequency harmonics on the resistor.

[0075] The voltage peak under the main frequency harmonic can be applied to the resistors in the arrester in sequence through the harmonic voltage generating device.

[0076] S5. Apply power frequency voltage to the resistor and adjust the amplitude of the power frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, then stop adjusting the amplitude of the power frequency voltage and determine the corresponding power frequency voltage as the equivalent continuous operating voltage of the resistor in the arrester.

[0077] Here, a power-frequency voltage is applied to the resistor, and the amplitude of the power-frequency voltage is adjusted to make the resistor's power consumption equal to the total test power consumption, thereby maximizing the resistor's power consumption. At this point, the power-frequency voltage applied to the resistor is the equivalent continuous operating voltage (power-frequency equivalent continuous operating voltage).

[0078] The present invention forms a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages through the steady-state voltage harmonic spectrum of the lightning arrester of the AC filter, determines the voltage amplitude corresponding to each time point, determines the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester, determines the voltage peak of the resistor in the lightning arrester according to the charge factor of the lightning arrester and the reference voltage of the resistor in the lightning arrester, draws a voltage peak time distribution diagram of the resistor under the main frequency harmonics, and based on this diagram, sequentially applies the voltage peak under the main frequency harmonics to the resistor in the lightning arrester to obtain the total test power consumption generated by the voltage peak under the main frequency harmonics on the resistor, applies the power frequency voltage to the resistor and adjusts the amplitude of the power frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, determines the corresponding power frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester, thereby only a single-frequency voltage generator is needed to generate the corresponding equivalent continuous operating voltage waveform and perform long-term stability testing on the lightning arrester resistor, thereby improving the accuracy of long-term stability verification.

[0079] In one practicable manner, step S1 specifically includes:

[0080] 101. Obtain steady-state voltage harmonic spectrum information of the arrester of the AC filter.

[0081] The steady-state voltage harmonic spectrum information of the arrester of the AC filter includes voltage harmonic spectrum information, and the voltage harmonic spectrum information includes information such as voltage amplitude, harmonic voltage, harmonic frequency, time, and period.

[0082] 102. Based on the steady-state voltage harmonic spectrum information of the arrester of the AC filter, the harmonic waveform signals corresponding to each harmonic voltage of the arrester are determined by using a cosine function, wherein the cosine function is:

[0083]

[0084] In the formula, y represents the voltage peak, A represents the harmonic voltage, represents the voltage amplitude, f represents the harmonic frequency, and t represents time.

[0085] 103. Linearly superimpose the harmonic waveform signals corresponding to the arrester under each harmonic voltage, and draw a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages based on the superposition results.

[0086] It should be noted that the harmonic waveform signals corresponding to each harmonic voltage of the lightning arrester are determined according to the cosine function. In order to make the calculation as accurate as possible, the time interval within one cycle (0-0.02s) is set to calculate a voltage peak data every 0.000001s, and the corresponding data of the voltage peak and time under the harmonic can be obtained. The corresponding data of the voltage peak and time under the harmonic can be connected using a smooth curve to obtain the harmonic voltage waveform signal. The harmonic voltage waveform signals of each subharmonic are linearly superimposed and drawn to obtain the harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages. For example, as shown Figure 2 As shown, Figure 2 The harmonic voltage waveform of the lightning arrester under the superposition of multiple harmonic voltages is shown.

[0087] In one possible implementation, step S3 specifically includes:

[0088] 301. Determine the voltage amplitude of the resistor in the arrester under the main frequency harmonics based on the chargeability of the arrester and the reference voltage of the resistor in the arrester.

[0089] Among them, the reference voltage of the resistor in the lightning arrester is known. By multiplying the reference voltage of the resistor in the lightning arrester with the charge factor of the lightning arrester, the voltage amplitude under the resistor in the lightning arrester can be obtained, and the voltage amplitude of the resistor in the lightning arrester under the main frequency harmonics can be determined.

[0090] In order to determine the main frequency band harmonics, before step S3, the following steps are further included:

[0091] 31. Determine the proportion of each harmonic voltage amplitude based on the steady-state voltage harmonic spectrum of the AC filter's lightning arrester;

[0092] 32. Compare the proportions of each harmonic voltage and select the harmonic order with the highest proportion of harmonic voltage amplitude as the main frequency harmonic.

[0093] For example, as shown in Table 1, Table 1 illustrates the multiple harmonic voltages and percentages of the lightning arrester, where the reference voltage of the lightning arrester is 106.8 kV. From Table 1, it can be calculated that the arithmetic sum of the harmonic voltage amplitudes is 83.3 kV, and the charging rate of the lightning arrester is calculated to be 0.78, and the main frequency band harmonic is the 13th harmonic.

[0094] Table 1

[0095]

[0096]

[0097] 302. Divide the voltage amplitude of a single resistor in the arrester under the main frequency harmonics into multiple step voltage ranges according to the amplitude ratio, and determine the voltage peak value and the time proportion occupied by each step voltage range.

[0098] For example, the voltage amplitude of a single resistor in the arrester under the main frequency harmonics can be divided into step voltage ranges according to 100%, 90%, 80%, 70%, 60%, 50%, 40%, and 30% of the amplitude, and the time proportion occupied by each step voltage range can be read.

[0099] 303. Draw a time-step distribution diagram of the voltage peak of a single resistor in the arrester under the main frequency harmonics based on the voltage peak of each step voltage range and the time proportion occupied by the voltage peak of each step voltage range under the main frequency harmonics.

[0100] Among them, the vertical axis of the voltage peak time step distribution diagram of the resistor under the main frequency harmonic is the voltage peak of the resistor, and the horizontal axis is the time proportion, as shown in the following example: Figure 3 As shown, Figure 3 The voltage peak time step distribution diagram is shown.

[0101] In one practicable manner, step S4 specifically includes:

[0102] 401. Determine the voltage peak value within each step voltage range under the main frequency harmonics and the time proportion occupied by each step voltage range based on the voltage peak time distribution diagram under the main frequency harmonics of the resistor;

[0103] 402. According to the time proportion of each step voltage range, apply the voltage peak value within each step voltage range under the main frequency harmonic to the resistor in the lightning arrester in turn, measure the power consumption generated by the voltage peak value within each step voltage range under the main frequency harmonic on the resistor, and calculate the total test power consumption by the following formula:

[0104]

[0105] Where P represents the total test power consumption, n represents the number of the step voltage range, a represents the number of step voltage ranges, and W n is the energy loss on the resistor caused by the voltage peak within the nth step voltage range, T is the power frequency period, P n is the power consumption measurement value generated on the resistor by the voltage peak within the nth step voltage range, t n It is the time value occupied by the nth step voltage range.

[0106] In one practicable manner, after step S5, the method further includes:

[0107] S61. Determine the equivalent charge factor of the resistor in the arrester according to the equivalent continuous operating voltage of the resistor in the arrester and the reference voltage of the resistor in the arrester.

[0108] S62. Compare the equivalent chargeability of the resistor in the arrester with a preset maximum chargeability threshold. If the equivalent chargeability of the resistor in the arrester is greater than the preset maximum chargeability threshold, determine that the harmonic aging capability of the resistor in the arrester is poor.

[0109] If the equivalent charge factor of the resistor in the arrester is not greater than a preset maximum charge factor threshold, it is determined that the harmonic aging capability of the resistor in the arrester meets the requirements.

[0110] The following is an example of a calculation method for the equivalent continuous operating voltage of a lightning arrester resistor provided in combination with the present invention, to demonstrate the effectiveness of the calculation of the equivalent continuous operating voltage provided by the present invention, as well as the effectiveness of the judgment of the harmonic aging capability of the resistor in the lightning arrester.

[0111] Specifically, as shown in Table 2, Table 2 illustrates the application scenario data for determining the harmonic aging capability of the resistor in the arrester in this example. According to the time proportion corresponding to each equivalent continuous operating voltage (0.30225, 0.10245, 0.1204, 0.1552, 0.222, 0.0558, 0.0272, 0.0147), voltages (1.23, 1.63, 2.04, 2.45, 2.86, 3.27, 3.68, 4.10, in kV) are applied to the resistor in the arrester at 60°C, 100°C, and 160°C, respectively. The total power consumption and the equivalent charge factor of the resistor are obtained. Among them, the maximum charge factor threshold is 0.95.

[0112] Table 2

[0113]

[0114]

[0115] It can be seen from Table 2 that the equivalent charge factor of the resistors at 60°C, 100°C, and 160°C are all lower than 0.95, and the harmonic aging capabilities of each resistor meet the requirements of engineering applications.

[0116] The above is a detailed description of an embodiment of a method for calculating the equivalent continuous operating voltage of a lightning arrester resistor provided by the present invention. The following is a detailed description of an embodiment of a system for calculating the equivalent continuous operating voltage of a lightning arrester resistor provided by the present invention.

[0117] For easier understanding, see Figure 4The present invention also provides a calculation system for the equivalent continuous operating voltage of a lightning arrester resistor, comprising:

[0118] The harmonic waveform drawing module 100 is used to form a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages according to the steady-state voltage harmonic spectrum of the lightning arrester of the AC filter;

[0119] A charge factor calculation module 200 is configured to determine the voltage amplitude corresponding to each time point based on the harmonic voltage waveform, and determine the charge factor of the arrester based on the voltage amplitude and the reference voltage of the arrester;

[0120] The voltage distribution drawing module 300 is used to determine the voltage peak of the resistor in the lightning arrester based on the charge factor of the lightning arrester and the reference voltage of the resistor in the lightning arrester, and draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics;

[0121] The test power consumption calculation module 400 is used to apply the voltage peak value under the main frequency harmonic to the resistor in the lightning arrester in sequence based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, and obtain the total test power consumption generated by the voltage peak value under the main frequency harmonic on the resistor;

[0122] The operating voltage calculation module 500 is used to apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

[0123] The present invention also provides an electronic device, the electronic device comprising a memory and a processor;

[0124] The memory is used to store programs;

[0125] The processor executes the program to implement the above method.

[0126] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above method is implemented.

[0127] The present invention also provides a computer program product comprising at least one computer-readable storage medium having computer-executable program code instructions stored therein, the computer-executable program code comprising:

[0128] The first program code portion is configured to form a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the lightning arrester of the AC filter;

[0129] The second program code portion is configured to determine a voltage amplitude corresponding to each time point based on the harmonic voltage waveform diagram, and determine a charge factor of the lightning arrester based on the voltage amplitude and a reference voltage of the lightning arrester;

[0130] The third program code portion is configured to determine a voltage peak of a resistor in the arrester based on a charge factor of the arrester and a reference voltage of the resistor in the arrester, and to plot a time distribution diagram of the voltage peak of the resistor under harmonics of the main frequency band;

[0131] The fourth program code portion is configured to sequentially apply voltage peaks under the main frequency harmonics to the resistors in the lightning arrester based on a time distribution diagram of voltage peaks under the main frequency harmonics of the resistors, and obtain a total test power consumption generated on the resistors by the voltage peaks under the main frequency harmonics;

[0132] The fifth program code portion is configured to apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

[0133] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, electronic device, and computer-readable storage medium can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0134] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer-readable storage media and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0135] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0136] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0137] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for executing all or part of the steps of the various embodiments of the method of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name: Read-Only Memory, English abbreviation: ROM), random access memory (full name: Random Access Memory, English abbreviation: RAM), magnetic disk or optical disk, and other media that can store program code.

[0138] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for calculating the equivalent continuous operating voltage of a lightning arrester resistor, characterized in that: The following steps are involved: According to the steady-state voltage harmonic spectrum of the arrester of the AC filter, a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages is formed; Determining the voltage amplitude corresponding to each time point according to the harmonic voltage waveform diagram, and determining the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester; Determining the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and drawing a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics, including: Determining the voltage amplitude of the resistor in the arrester under the main frequency harmonic according to the charge factor of the arrester and the reference voltage of the resistor in the arrester; Dividing the voltage amplitude of a single resistor in the arrester under the main frequency harmonics into multiple step voltage ranges according to the amplitude ratio, and determining the voltage peak value and the time proportion occupied by each step voltage range; Draw a time ladder distribution diagram of the voltage peak of the resistor under the main frequency harmonics according to the voltage peak of each step voltage range and the time proportion occupied by the single resistor in the lightning arrester under the main frequency harmonics; Based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, the voltage peak under the main frequency harmonic is applied to the resistor in the lightning arrester in sequence, and the total test power consumption generated by the voltage peak under the main frequency harmonic on the resistor is obtained; Apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

2. The method for calculating the equivalent continuous operating voltage of a lightning arrester resistor according to claim 1, characterized in that: The step of forming a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the arrester of the AC filter specifically includes: Obtain the steady-state voltage harmonic spectrum information of the arrester of the AC filter; According to the steady-state voltage harmonic spectrum information of the lightning arrester of the AC filter, the harmonic waveform signals corresponding to each harmonic voltage of the lightning arrester are determined by a cosine function, wherein the cosine function is: In the formula, y represents the voltage peak, A represents the harmonic voltage, represents the voltage amplitude, f represents the harmonic frequency, and t represents the time; The harmonic waveform signals corresponding to each harmonic voltage of the lightning arrester are linearly superimposed, and the harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages is drawn according to the superposition results.

3. The method for calculating the equivalent continuous operating voltage of a lightning arrester resistor according to claim 1, characterized in that: The step of applying the voltage peak value under the main frequency harmonics to the resistors in the arrester in sequence based on the voltage peak time distribution diagram of the resistors under the main frequency harmonics, and obtaining the total test power consumption generated by the voltage peak value under the main frequency harmonics on the resistors specifically includes: Determine the voltage peak value within each step voltage range under the main frequency harmonics and the time proportion occupied by each step voltage range according to the voltage peak time distribution diagram under the main frequency harmonics of the resistor; According to the time proportion of each step voltage range, the voltage peaks within each step voltage range under the main frequency harmonics are applied to the resistor in the arrester in sequence, and the power consumption generated by the voltage peaks within each step voltage range under the main frequency harmonics on the resistor is measured respectively. The total test power consumption is calculated by the following formula: Where P represents the total test power consumption, n represents the number of the step voltage range, a represents the number of step voltage ranges, and W n is the energy loss on the resistor caused by the voltage peak within the nth step voltage range, T is the power frequency period, P n is the power consumption measurement value generated on the resistor by the voltage peak within the nth step voltage range, t n It is the time value occupied by the nth step voltage range.

4. The method for calculating the equivalent continuous operating voltage of a lightning arrester resistor according to claim 3, characterized in that: Before the step of determining the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and drawing a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics, the method further includes: Determine the proportion of each harmonic voltage amplitude based on the steady-state voltage harmonic spectrum of the AC filter's lightning arrester; The proportions of each harmonic voltage are compared, and the harmonic order with the highest proportion of harmonic voltage amplitude is selected as the main frequency harmonic.

5. The method for calculating the equivalent continuous operating voltage of a lightning arrester resistor according to claim 1, characterized in that: After the step of applying a power frequency voltage to the resistor and adjusting the amplitude of the power frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stopping adjusting the amplitude of the power frequency voltage and determining the corresponding power frequency voltage as the equivalent continuous operating voltage of the resistor in the arrester, the method further includes: Determining the equivalent charge factor of the resistor in the arrester according to the equivalent continuous operating voltage of the resistor in the arrester and the reference voltage of the resistor in the arrester; The equivalent chargeability of the resistor in the arrester is compared with a preset maximum chargeability threshold. If the equivalent chargeability of the resistor in the arrester is greater than the preset maximum chargeability threshold, it is determined that the harmonic aging capability of the resistor in the arrester is poor.

6. A calculation system for the equivalent continuous operating voltage of a lightning arrester resistor, characterized in that: include: A harmonic waveform drawing module is used to form a harmonic voltage waveform diagram of the arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the arrester of the AC filter; a charge factor calculation module, configured to determine the voltage amplitude corresponding to each time point according to the harmonic voltage waveform diagram, and determine the charge factor of the lightning arrester according to the voltage amplitude and the reference voltage of the lightning arrester; A voltage distribution drawing module is used to determine the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics; Determining the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and drawing a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics, including: Determining the voltage amplitude of the resistor in the arrester under the main frequency harmonic according to the charge factor of the arrester and the reference voltage of the resistor in the arrester; Dividing the voltage amplitude of a single resistor in the arrester under the main frequency harmonics into multiple step voltage ranges according to the amplitude ratio, and determining the voltage peak value and the time proportion occupied by each step voltage range; Draw a time ladder distribution diagram of the voltage peak of the resistor under the main frequency harmonics according to the voltage peak of each step voltage range and the time proportion occupied by the single resistor in the lightning arrester under the main frequency harmonics; A test power consumption calculation module is used to apply the voltage peak value under the main frequency harmonic to the resistor in the lightning arrester in sequence based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, and obtain the total test power consumption generated by the voltage peak value under the main frequency harmonic on the resistor; An operating voltage calculation module is used to apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

7. An electronic device, characterized in that: The electronic device includes a memory and a processor; The memory is used to store programs; The processor executes the program to implement the method according to any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

9. A computer program product comprising at least one computer-readable storage medium, characterized in that The computer-readable storage medium has computer-executable program code instructions stored therein, the computer-executable program code comprising: The first program code portion is configured to form a harmonic voltage waveform diagram of the lightning arrester under the superposition of multiple harmonic voltages based on the steady-state voltage harmonic spectrum of the lightning arrester of the AC filter; The second program code portion is configured to determine a voltage amplitude corresponding to each time point based on the harmonic voltage waveform diagram, and determine a charge factor of the lightning arrester based on the voltage amplitude and a reference voltage of the lightning arrester; The third program code portion is configured to determine the voltage peak of the resistor in the lightning arrester based on the charge factor of the lightning arrester and the reference voltage of the resistor in the lightning arrester, and to draw a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics; Determining the voltage peak of the resistor in the arrester according to the charge factor of the arrester and the reference voltage of the resistor in the arrester, and drawing a time distribution diagram of the voltage peak of the resistor under the main frequency harmonics, including: Determining the voltage amplitude of the resistor in the arrester under the main frequency harmonic according to the charge factor of the arrester and the reference voltage of the resistor in the arrester; Dividing the voltage amplitude of a single resistor in the arrester under the main frequency harmonics into multiple step voltage ranges according to the amplitude ratio, and determining the voltage peak value and the time proportion occupied by each step voltage range; Draw a time ladder distribution diagram of the voltage peak of the resistor under the main frequency harmonics according to the voltage peak of each step voltage range and the time proportion occupied by the single resistor in the lightning arrester under the main frequency harmonics; The fourth program code portion is configured to apply the voltage peak value under the main frequency harmonic to the resistor in the lightning arrester in sequence based on the voltage peak time distribution diagram of the resistor under the main frequency harmonic, and obtain the total test power consumption generated by the voltage peak value under the main frequency harmonic on the resistor; The fifth program code portion is configured to apply an industrial frequency voltage to the resistor and adjust the amplitude of the industrial frequency voltage until the actual power consumption of the resistor reaches the total test power consumption, stop adjusting the amplitude of the industrial frequency voltage and determine the corresponding industrial frequency voltage as the equivalent continuous operating voltage of the resistor in the lightning arrester.

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