A method, system, electronic device and storage medium for adjusting RC time constant of DC voltage divider

Abstract

The present invention discloses a method, system, electronic device and storage medium for adjusting RC time constant of a DC voltage divider, including: inputting power frequency voltage into a DC voltage divider and a standard voltage transformer; automatically obtaining the initial AC ratio difference of the DC voltage divider through a transformer calibration system; calculating the relationship before and after the low-voltage arm capacitance modification, and determining the target capacitance value after the low-voltage arm adjustment; inside the low-voltage arm circuit, adjusting the capacitance by introducing an adjustable capacitor component, and obtaining the adjusted low-voltage arm capacitance value; obtaining the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted through the transformer calibration system again; automatically judging whether the ratio difference test record of the calibration system host computer meets the qualified standard through a database, outputting the AC ratio difference after judgment, and ensuring that the RC time constants of the high-voltage arm and the low-voltage arm remain consistent. The present invention makes the RC time constants of the high-voltage arm and the low-voltage arm basically consistent, and improves the calibration efficiency and accuracy of the DC voltage divider RC time constant adjustment.

Description

Technical Field

[0001] The present invention relates to the field of measurement and calibration technology, and in particular to a method, system, electronic device and storage medium for adjusting a DC voltage divider RC time constant. Background Art

[0002] With the transformation of the global energy structure, the continuous growth of electricity demand and the rapid development of renewable energy, efficient and stable power transmission technology is particularly important. As a new type of power transmission technology, it has many advantages such as high efficiency, low loss and flexibility. Compared with conventional direct current transmission technology, flexible direct current transmission technology can realize high-efficiency long-distance transmission of large-scale clean energy.

[0003] Flexible DC transmission technology is developed on the basis of conventional DC transmission technology. Due to its own characteristics, it puts forward higher requirements on the design and manufacture of control and protection. As the basic core equipment of DC control and protection, DC voltage divider has always been the focus of attention of all parties. In large-capacity and ultra-high voltage flexible DC transmission systems, DC voltage divider is a new type of measurement device, especially in the measurement of the outlet voltage on the converter transformer side. It requires stable performance and accurate AC and DC voltage measurement. It has been widely used in various flexible DC transmission projects, and the voltage level has been upgraded from the early , To date ; The DC voltage dividers currently used in DC engineering are all based on the principle of resistor-capacitor voltage dividers, and the output signals are sent to protection and measurement and control devices.

[0004] In actual engineering applications, the existing DC voltage divider mainly includes a high-voltage arm and a low-voltage arm, which are composed of resistors and capacitors of different specifications. The DC accuracy mainly depends on the resistance of the high and low voltage arms, and the current technology can meet the requirements within 0.2%; the AC accuracy mainly depends on the RC time constant of the high and low voltage arms. Theoretically, when the RC time constants are equal, the resistance and capacitance parameters are symmetrically matched, the voltage division ratio of the DC voltage divider is independent of the frequency, and the voltage divider has the best frequency characteristics. However, due to the bottleneck of the current high-voltage DC capacitor manufacturing process, the current capacitance cannot meet the 0.2% requirement, resulting in the DC voltage divider being unable to ensure the consistency of the RC time constants of the high and low voltage arms during the production process, affecting the AC accuracy and frequency characteristics of the DC voltage divider.

[0005] Therefore, a method for adjusting the RC time constant of a DC voltage divider is urgently needed. Summary of the invention

[0006] In view of the above existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a method, system, electronic device and storage medium for adjusting the RC time constant of a DC voltage divider to solve the problem of asymmetric matching of resistance and capacitance parameters of a DC voltage divider in the prior art.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] In a first aspect, the present invention provides a method for adjusting a DC voltage divider RC time constant, comprising:

[0010] Based on the power frequency voltage generated by the power frequency voltage generator, the power frequency voltage is input to a DC voltage divider and a standard voltage transformer;

[0011] Based on the output difference between the DC voltage divider and the standard voltage transformer, the initial AC ratio difference of the DC voltage divider is automatically obtained through the transformer calibration system;

[0012] Based on the obtained initial AC ratio difference, the relationship between the low-voltage arm capacitance before and after modification is calculated to determine the target capacitance value of the low-voltage arm after adjustment;

[0013] Based on the target capacitance value, an adjustable capacitance component is introduced inside the low-voltage arm circuit to adjust the capacitance, thereby obtaining an adjusted low-voltage arm capacitance value;

[0014] Based on the adjusted low-voltage arm capacitance value, the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted is obtained again through the mutual inductor calibration system;

[0015] Extract the latest adjustment data of the transformer calibration system through the calibration system host computer and automatically generate the ratio difference test record;

[0016] The database automatically determines whether the ratio difference test record of the upper computer of the calibration system meets the qualified standard, and outputs the AC ratio difference value after judgment to ensure that the RC time constants of the high-voltage arm and the low-voltage arm are consistent;

[0017] As a preferred solution of the method for adjusting the RC time constant of a DC voltage divider of the present invention, the method of automatically calibrating the AC error of the DC voltage divider comprises the following steps:

[0018] The DC voltage divider includes distributing the power frequency voltage through capacitors on the high voltage arm and the low voltage arm. The relationship between the output voltage of the low voltage arm and the primary voltage is expressed as: ,in, Represents the primary voltage of the DC voltage divider, Represents the output voltage of the low voltage arm of the DC voltage divider, Indicates the high voltage arm capacitance value, Indicates the low voltage arm capacitance value.

[0019] As a preferred solution of the DC voltage divider RC time constant adjustment method of the present invention, wherein: the output difference between the DC voltage divider and the standard voltage transformer is obtained by using a transformer calibration system.

[0020] Automatically obtain the initial AC ratio difference of the DC voltage divider, including the transformer calibration system calculating the average value of the secondary output voltage of the DC voltage divider and the standard voltage transformer according to the determined window time, and comparing them to obtain the initial AC ratio difference of the DC voltage divider .

[0021] As a preferred solution of the DC voltage divider RC time constant adjustment method of the present invention, wherein: the initial AC ratio difference of the DC voltage divider It is expressed as: ,in, Represents the output voltage of the low voltage arm of the DC voltage divider, Represents the second

[0022] Secondary output voltage.

[0023] As a preferred solution of the DC voltage divider RC time constant adjustment method of the present invention, wherein: based on the obtained initial AC ratio difference, the relationship between the low voltage arm capacitance before and after modification is calculated to determine the low voltage arm capacitance.

[0024] The target capacitance value after the pressure arm adjustment is expressed as:

[0025] ,

[0026] ,

[0027] ,

[0028] ,in, It represents the output voltage after the capacitance of the low voltage arm of the DC voltage divider is modified. Indicates the target capacitance value after low voltage arm adjustment, Indicates the high voltage arm capacitance value, Represents the original capacitance value of the low voltage arm, Indicates the primary voltage of the DC voltage divider.

[0029] As a preferred solution of the method for adjusting the RC time constant of a DC voltage divider according to the present invention, the method for adjusting the capacitance by introducing an adjustable capacitance component comprises the following steps:

[0030] An adjustable capacitor component is introduced into the low-voltage arm of the DC voltage divider, and the capacitance value of the low-voltage arm is adjusted by adjusting the capacitance value;

[0031] If the capacitance adjustment value is positive, increase the capacitance value and add a capacitor equal to the capacitance fine-tuning value in the parallel adjustment position;

[0032] If the capacitance adjustment value is negative, reduce the capacitance value and install appropriate capacitance in the series adjustment position to ensure that the total capacitance reduction of the branch matches the capacitance adjustment value.

[0033] As a preferred solution of the DC voltage divider RC time constant adjustment method of the present invention, the capacitance adjustment value is expressed as:

[0034] .

[0035] In a second aspect, the present invention provides a DC voltage divider RC time constant adjustment system, comprising:

[0036] An input module, for inputting the power frequency voltage to a DC voltage divider and a standard voltage transformer based on the power frequency voltage generated by the power frequency voltage generator;

[0037] An acquisition module, used for automatically acquiring an initial AC ratio difference of the DC voltage divider through a transformer calibration system based on an output difference between the DC voltage divider and a standard voltage transformer;

[0038] A calculation module, used to calculate the relationship between the capacitance of the low-voltage arm before and after modification based on the obtained initial AC ratio difference, and determine the target capacitance value of the low-voltage arm after adjustment;

[0039] An adjustment module is used for adjusting the capacitance of the low-voltage arm by introducing an adjustable capacitance component inside the low-voltage arm circuit based on the target capacitance value to obtain an adjusted low-voltage arm capacitance value;

[0040] A re-acquisition module is used to obtain the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted through the mutual inductor calibration system based on the adjusted low-voltage arm capacitance value;

[0041] The extraction module is used to extract the latest adjustment data of the transformer calibration system through the calibration system host computer and automatically generate the ratio difference test record;

[0042] The judgment module is used to automatically judge whether the ratio difference test record of the upper computer of the calibration system meets the qualified standard through the database, and output the AC ratio difference value after judgment to ensure that the RC time constants of the high-voltage arm and the low-voltage arm remain consistent.

[0043] In a third aspect, the present invention provides a computing device, comprising:

[0044] Memory, used to store programs;

[0045] The processor is used to execute the computer executable instructions, and the computer executable instructions, when executed by the processor, implement the steps of the DC voltage divider RC time constant adjustment method.

[0046] In a fourth aspect, the present invention provides a computer-readable storage medium, comprising: when the program is executed by a processor, the steps of implementing the method for adjusting the RC time constant of a DC voltage divider are implemented.

[0047] Beneficial effects of the present invention: By adjusting the capacitance of the low-voltage arm, the present invention can keep the RC time constants of the high-voltage arm and the low-voltage arm consistent, thereby optimizing the overall performance of the DC voltage divider. This means that the DC voltage divider can respond faster and more accurately when facing a changing signal, thereby improving the dynamic performance and stability of the device. By adopting a transformer calibration system and automated database management, the technical solution greatly simplifies the calibration process, reduces manual intervention, reduces the error rate, and improves work efficiency. This not only saves time and cost, but also ensures the standardization of the calibration process and the reliability of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0049] Figure 1 A basic flow chart of a method for adjusting the RC time constant of a DC voltage divider provided by an embodiment of the present invention;

[0050] FIG2 is a structural diagram of a conventional DC voltage divider of a DC voltage divider RC time constant adjustment method provided by an embodiment of the present invention;

[0051] FIG. 3 is a flowchart of an automated calibration of a method for adjusting a DC voltage divider RC time constant provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0054] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0055] Example 1

[0056] Reference Figure 1-Figure 3 , is an embodiment of the present invention, and provides a method for adjusting the RC time constant of a DC voltage divider, such as Figure 1 As shown, the following steps are included:

[0057] As shown in FIG2 , a conventional DC voltage divider is shown. The DC voltage divider includes a high voltage arm and a low voltage arm. The high voltage arm includes a high voltage arm resistor. and high voltage arm capacitor , the low voltage arm includes the low voltage arm resistor and low voltage arm capacitor , high voltage arm resistance and high voltage arm capacitor Form a parallel circuit, the low voltage arm resistor and low voltage arm capacitor In addition, a parallel circuit is formed, and the two parallel circuits are connected to each other through a common node to perform resistance-capacitance voltage division.

[0058] like Figure 2 As shown, the time constant of the high voltage arm of the DC voltage divider is , the time constant of the low voltage arm is , , and The resistance or capacitance value can reach the requirement of 0.1%, The capacitance value accuracy can only meet the 3% requirement due to technical limitations. The DC voltage division is achieved through and Therefore, in order to make the AC accuracy of the DC voltage divider meet 0.2%, only fine-tuning The capacitance value makes the RC time constant of the high-voltage arm and the low-voltage arm as consistent as possible.

[0059] S1: Based on the power frequency voltage generated by the power frequency voltage generator, the power frequency voltage is input to the DC voltage divider and the standard voltage transformer.

[0060] Furthermore, the DC voltage divider distributes the voltage through the capacitors on the high-voltage arm and the low-voltage arm. The relationship between the output voltage of the low-voltage arm and the primary voltage is expressed as:

[0061] ,in, Represents the primary voltage of the DC voltage divider, Represents the output voltage of the low voltage arm of the DC voltage divider, Indicates the high voltage arm capacitance value, Indicates the low voltage arm capacitance value.

[0062] S2: Based on the output difference between the DC voltage divider and the standard voltage transformer, the initial AC ratio difference of the DC voltage divider is automatically obtained through the transformer calibration system.

[0063] Furthermore, based on the output difference between the DC voltage divider and the standard voltage transformer, the initial AC ratio difference of the DC voltage divider is automatically obtained through the transformer verification system, that is, the transformer verification system calculates the average value of the secondary output voltage of the DC voltage divider and the standard voltage transformer according to the determined window time, and

[0064] By comparison, we can get the initial AC ratio difference of the DC voltage divider. .

[0065] Furthermore, the initial AC ratio difference The calculation is expressed as: ,in, Represents the output voltage of the low voltage arm of the DC voltage divider, Represents the secondary output voltage of a standard transformer.

[0066] It should be noted that the capacitance values ​​of the high and low voltage arms of the DC voltage divider are fixed. Under AC voltage, the DC voltage divider divides the voltage through capacitance and outputs a secondary voltage value on the low voltage arm, which can be compared with the secondary voltage of the standard voltage transformer in real time. The accuracy of the standard voltage transformer can reach above level 0.05.

[0067] It should be noted that when a DC voltage divider is used with a standard voltage transformer, it is necessary to know the voltage divider ratio of the DC voltage divider and the voltage divider ratio of the standard voltage transformer, set the voltage divider ratio in the transformer calibration system, and know that the voltage value applied to the primary end of the DC voltage divider and the standard voltage transformer is at least 10% of the rated voltage (for example ).

[0068] S3: Based on the obtained initial AC ratio difference, the relationship between the low-voltage arm capacitance before and after modification is calculated to determine the target capacitance value of the low-voltage arm after adjustment.

[0069] Furthermore, the relationship between the low-voltage arm capacitance before and after modification is expressed as:

[0070] ,

[0071] ,

[0072] ,

[0073] ,

[0074] in, It represents the output voltage after the capacitance of the low voltage arm of the DC voltage divider is modified. Indicates the target capacitance value after low voltage arm adjustment, Represents the original capacitance value of the low voltage arm, Indicates the high voltage arm capacitance value, Indicates the primary voltage of the DC voltage divider.

[0075] Furthermore, the target capacitance value after the low-voltage arm adjustment is calculated. Generally, the high-voltage arm of the DC voltage divider adopts a capacitor of pF level, and the low-voltage arm adopts a capacitor of μF level, that is, << , the adjusted target capacitance value includes,

[0076] .

[0077] S3: Based on the target capacitance value, an adjustable capacitance component is introduced inside the low-voltage arm circuit to adjust the capacitance, thereby obtaining an adjusted low-voltage arm capacitance value.

[0078] Furthermore, the capacitance is adjusted by introducing an adjustable capacitor component, including the following steps:

[0079] An adjustable capacitor component is introduced into the low-voltage arm of the DC voltage divider, and the capacitance value of the low-voltage arm is adjusted by adjusting the capacitance value;

[0080] If the capacitance adjustment value is positive, increase the capacitance value and add a capacitor equal to the capacitance fine-tuning value in the parallel adjustment position;

[0081] If the capacitance adjustment value is negative, reduce the capacitance value and install appropriate capacitance in the series adjustment position to ensure that the total capacitance reduction of the branch matches the capacitance adjustment value.

[0082] Furthermore, the capacitance adjustment value is expressed as:

[0083] .

[0084] As shown in Figure 3, the low voltage arm part includes the low voltage arm capacitor Connected in series between the high-voltage arm and the ground, the high-voltage arm capacitor is used to divide the voltage under AC voltage or high-frequency voltage, and the low-voltage arm capacitor is used to divide the voltage under AC voltage or high-frequency voltage. Space is reserved on the parallel and series branches to form an adjustable capacitor component, which can adjust the capacitance value of the low-voltage arm.

[0085] As shown in FIG3 , the low-voltage arm is specifically shown as follows: the low-voltage arm of the DC voltage divider includes a low-voltage arm resistor , low voltage arm capacitor , adjustable capacitor components and , discharge tube and varistor , where the discharge tube and the varistor are connected in series and in parallel with the low-voltage arm resistor. and After concatenation and In parallel, and overall and low voltage arm resistance Before the RC time constant is adjusted, Use silver-plated copper wire for short circuit. is disconnected, so the low voltage arm capacitance is ; After adjusting the RC time constant, it is necessary to or Add the corresponding capacitance, the low voltage arm capacitance is the equivalent capacitance .

[0086] Furthermore, as shown in FIG3 , the complete process is to use a power frequency voltage generator to simultaneously apply a power frequency voltage to the high voltage end of the DC voltage divider and the standard voltage transformer; and the secondary output voltage of the standard voltage transformer Transmitted to the transformer calibration system;

[0087] The host computer of the system obtains the data provided by the transformer verification system, automatically determines whether the data collated by the host computer of the verification system is qualified through the database, and forms a factory test report.

[0088] Furthermore, as shown in FIG3 , the DC voltage divider is a device consisting of a high voltage arm and a low voltage arm, wherein the high voltage arm includes a high voltage arm resistor. and high voltage arm capacitor , high voltage arm resistance and high voltage arm capacitor The low voltage arm forms a parallel circuit, and the low voltage arm forms another parallel circuit.

[0089] They are connected to each other through a common node for DC voltage division; the power frequency voltage generator is connected to the standard voltage transformer, the standard voltage transformer is connected to the DC voltage divider, the secondary sides of the DC voltage divider and the standard voltage transformer are connected to the transformer verification system, the transformer verification system is connected to the verification system host computer, and the verification system host computer is connected to the database.

[0090] S5: Based on the adjusted low-voltage arm capacitance value, the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted is obtained again through the transformer calibration system.

[0091] S6: The latest adjustment data of the transformer calibration system is extracted through the calibration system host computer, and the ratio difference test record is automatically generated.

[0092] Furthermore, the functions of the verification system host computer include obtaining data provided by the transformer verification system, including primary test voltage, primary standard voltage, AC ratio difference, number of channels and other data, matching the obtained data one by one according to a fixed format, and forming a test report.

[0093] S7: Automatically judge whether the ratio difference test record of the upper computer of the calibration system meets the qualified standard through the database, and output the AC ratio difference value after judgment to ensure that the RC time constants of the high-voltage arm and the low-voltage arm remain consistent.

[0094] Furthermore, the functions of the database include automatically determining whether the data collated by the upper computer of the calibration system is qualified, and automatically archiving it according to the product number to form a factory test report.

[0095] Furthermore, the automatic determination of whether the ratio difference test record of the calibration system host computer meets the qualified standard also includes: if the AC ratio difference of the DC voltage divider meets the requirement of 0.2%, the data is judged to be qualified and the final AC ratio difference is recorded as the calibration result; if the AC ratio difference of the DC voltage divider does not meet the requirement of 0.2%, then

[0096] If the data is judged to be unqualified, the calibration is repeated iteratively until the RC time constants of the high and low voltage arms are consistent or meet the preset accuracy requirements.

[0097] It should be noted that the present invention provides a method for adjusting the RC time constant of a DC voltage divider. In this method, it is not necessary to require the ratio difference of the high-voltage arm capacitance value to be within 0.2%. It is only necessary to adjust the capacitance value of the low-voltage arm according to the fixed capacitance value of the high-voltage arm, so that the RC time constants of the high-voltage and low-voltage arms are basically the same, and the AC accuracy is improved.

[0098] The grade can reach 0.2, which greatly reduces the difficulty of product manufacturing; and, in the entire process of the automated calibration method of the present invention, data recording, verification and report generation are all automated simulations, without the need for human participation, which greatly improves the efficiency of precision calibration and avoids errors caused by human factors; secondly, the fine-tuning capacitor method of the low-voltage arm of the DC voltage divider of the present invention is simple, reliable, and highly accurate, and its convenience is greatly improved.

[0099] It should be noted that the RC time constant refers to the time required for a capacitor to charge or discharge to 63.2% of the final voltage value in a circuit composed of resistors and capacitors, which directly affects the circuit's response characteristics to signals. By adjusting the capacitance value of the low-voltage arm, you are actually adjusting the RC time constant of the low-voltage arm to make it as close to the RC time constant of the high-voltage arm as possible.

[0100] It should be noted that, through the automatic judgment function of the database, it can be ensured that the adjusted low-voltage arm capacitance value makes the RC time constants of the high-voltage arm and the low-voltage arm consistent or within an acceptable ratio difference range.

[0101] It should be noted that by automating the calibration process, the low voltage arm capacitor value is adjusted to match the RC time constant of the high voltage arm, achieving the two goals simultaneously. However, it is worth noting that ensuring the consistency of the RC time constant is one of the key steps to reduce the AC ratio difference, because the difference in RC time constant

[0102] This will cause the circuit to respond differently to the AC signal, thereby generating a measurement ratio difference. Therefore, the present invention simultaneously solves the AC ratio difference calibration and RC time constant consistency problems by adjusting the capacitance value, which is a comprehensive solution.

[0103] This embodiment also provides a DC voltage divider RC time constant adjustment system, including:

[0104] An input module, for inputting the power frequency voltage to a DC voltage divider and a standard voltage transformer based on the power frequency voltage generated by the power frequency voltage generator;

[0105] An acquisition module, used for automatically acquiring an initial AC ratio difference of the DC voltage divider through a transformer calibration system based on an output difference between the DC voltage divider and a standard voltage transformer;

[0106] A calculation module, used to calculate the relationship between the capacitance of the low-voltage arm before and after modification based on the obtained initial AC ratio difference, and determine the target capacitance value of the low-voltage arm after adjustment;

[0107] An adjustment module is used for adjusting the capacitance of the low-voltage arm by introducing an adjustable capacitance component inside the low-voltage arm circuit based on the target capacitance value to obtain an adjusted low-voltage arm capacitance value;

[0108] A re-acquisition module is used to obtain the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted through the mutual inductor calibration system based on the adjusted low-voltage arm capacitance value;

[0109] The extraction module is used to extract the latest adjustment data of the transformer calibration system through the calibration system host computer and automatically generate the ratio difference test record;

[0110] The judgment module is used to automatically judge whether the ratio difference test record of the upper computer of the calibration system meets the qualified standard through the database, and output the AC ratio difference value after judgment to ensure that the RC time constants of the high-voltage arm and the low-voltage arm remain consistent.

[0111] Furthermore, it also includes:

[0112] Memory, used to store programs;

[0113] A processor is used for loading the program to execute the DC voltage divider RC time constant adjustment method.

[0114] This embodiment further provides a computer-readable storage medium storing a program, and when the program is executed by a processor, the method for adjusting the RC time constant of a DC voltage divider is implemented.

[0115] The storage medium proposed in this embodiment and the DC voltage divider RC time constant adjustment method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0116] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0117] Example 2

[0118] Refer to Table 1 and Figure 3, is an embodiment of the present invention, and provides a method for adjusting the RC time constant of a DC voltage divider. In order to verify its beneficial effects, specific test results are provided.

[0119] This example uses the Liubei Converter Station of the Wudongde DC Project Taking the calibration of DC voltage divider as an example, the AC ratio difference of DC voltage divider is automatically calibrated to obtain the AC ratio difference. , and according to the actual test product low voltage arm capacitance value Calculate the adjusted target capacitance value , modify the low voltage arm capacitance value according to Figure 3,

[0120] The AC ratio difference of each voltage test point of the DC voltage divider was tested again. After calibration, the ratio difference of each measurement point between 5% and 150% of the boost measurement was shown in Table 1.

[0121] Table 1: Ratio difference table of each measurement point

[0122]

[0123] As shown in Table 1, the method provided by the present invention calibrates the AC ratio difference once, and the ratio difference of the DC voltage divider at different measurement points (20%, 80%, 100%, 120% rated value) is within a small range, which can achieve an accuracy level of 0.2. Therefore, the method provided by the present invention is simple, accurate and has high precision, which improves

[0124] Calibration efficiency and accuracy of DC voltage divider RC time constant adjustment.

[0125] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for adjusting a DC voltage divider RC time constant, characterized in that: include: Based on the power frequency voltage generated by the power frequency voltage generator, the power frequency voltage is input to a DC voltage divider and a standard voltage transformer; Based on the output difference between the DC voltage divider and the standard voltage transformer, the initial AC ratio difference of the DC voltage divider is automatically obtained through the transformer calibration system; Based on the obtained initial AC ratio difference, the relationship between the low-voltage arm capacitance before and after modification is calculated to determine the target capacitance value of the low-voltage arm after adjustment; Based on the target capacitance value, an adjustable capacitance component is introduced inside the low-voltage arm circuit to adjust the capacitance, thereby obtaining an adjusted low-voltage arm capacitance value; Based on the adjusted low-voltage arm capacitance value, the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted is obtained again through the mutual inductor calibration system; Extract the latest adjustment data of the transformer calibration system through the calibration system host computer and automatically generate the ratio difference test record; The database automatically determines whether the ratio difference test record of the upper computer of the calibration system meets the qualified standard, and outputs the AC ratio difference value after judgment to ensure that the RC time constants of the high-voltage arm and the low-voltage arm are consistent; Based on the obtained initial AC ratio difference, the relationship between the low-voltage arm capacitance before and after modification is calculated, and the target capacitance value of the low-voltage arm after adjustment is determined to be expressed as: δ=(U2-U2′) / U2′ U2=C1U1 / (C1+C2) U2′=C1U1 / (C1+C2′) C2′=C2(1+δ)+δC1 Wherein, δ represents the initial AC ratio difference of the DC voltage divider, U2 represents the output voltage of the low-voltage arm of the DC voltage divider, U2′ represents the output voltage of the low-voltage arm of the DC voltage divider after the capacitance is modified, C2′ represents the target capacitance value of the low-voltage arm after adjustment, C1 represents the capacitance value of the high-voltage arm, C2 represents the original capacitance value of the low-voltage arm, and U1 represents the primary voltage of the DC voltage divider; The initial AC ratio difference δ of the DC voltage divider is expressed as: δ=(U2-U0) / U0 Among them, U2 represents the output voltage of the low-voltage arm of the DC voltage divider, and U0 represents the secondary output voltage of the standard voltage transformer.

2. The method for adjusting the RC time constant of a DC voltage divider according to claim 1, wherein: The DC voltage divider includes distributing the power frequency voltage through capacitors on the high voltage arm and the low voltage arm. The relationship between the output voltage of the low voltage arm and the primary voltage is expressed as: U2 / U1=C1 / (C1+C2) Among them, U1 represents the primary voltage of the DC voltage divider, U2 represents the output voltage of the low-voltage arm of the DC voltage divider, C1 represents the capacitance value of the high-voltage arm, and C2 represents the capacitance value of the low-voltage arm.

3. The method for adjusting the RC time constant of a DC voltage divider according to claim 1 or 2, characterized in that: Based on the output difference between the DC voltage divider and the standard voltage transformer, the initial AC ratio difference of the DC voltage divider is automatically obtained through the transformer verification system, including the transformer verification system calculating the average values ​​of the secondary output voltage quantities of the DC voltage divider and the standard voltage transformer according to the determined window time, and comparing them to obtain the initial AC ratio difference δ of the DC voltage divider.

4. The method for adjusting the RC time constant of a DC voltage divider as claimed in claim 3, wherein: The method of adjusting capacitance by introducing an adjustable capacitance component comprises the following steps: An adjustable capacitor component is introduced into the low-voltage arm of the DC voltage divider, and the capacitance value of the low-voltage arm is adjusted by adjusting the capacitance value; If the capacitance adjustment value is positive, increase the capacitance value and add a capacitor equal to the capacitance fine-tuning value in the parallel adjustment position; If the capacitance adjustment value is negative, the capacitance value is reduced and appropriate capacitance is installed in the series adjustment position to ensure that the total capacitance reduction of the current branch matches the capacitance adjustment value.

5. The method for adjusting the RC time constant of a DC voltage divider as claimed in claim 4, wherein: The capacitance adjustment value C2δ is expressed as: C2 ′ -C2=C2δ。 6. A system based on the DC voltage divider RC time constant adjustment method according to claim 1, characterized in that: An input module, for inputting the power frequency voltage to a DC voltage divider and a standard voltage transformer based on the power frequency voltage generated by the power frequency voltage generator; An acquisition module, used for automatically acquiring an initial AC ratio difference of the DC voltage divider through a transformer calibration system based on an output difference between the DC voltage divider and a standard voltage transformer; A calculation module, used to calculate the relationship between the capacitance of the low-voltage arm before and after modification based on the obtained initial AC ratio difference, and determine the target capacitance value of the low-voltage arm after adjustment; An adjustment module is used for adjusting the capacitance of the low-voltage arm by introducing an adjustable capacitance component inside the low-voltage arm circuit based on the target capacitance value to obtain an adjusted low-voltage arm capacitance value; A re-acquisition module is used to obtain the AC ratio difference of the DC voltage divider after the low-voltage arm capacitance value is adjusted through the mutual inductor calibration system based on the adjusted low-voltage arm capacitance value; The extraction module is used to extract the latest adjustment data of the transformer calibration system through the calibration system host computer and automatically generate the ratio difference test record; The judgment module is used to automatically judge whether the ratio difference test record of the upper computer of the calibration system meets the qualified standard through the database, and output the AC ratio difference value after judgment to ensure that the RC time constants of the high-voltage arm and the low-voltage arm remain consistent.

7. An electronic device, characterized in that: include: Memory, used to store programs; A processor, used for loading the program to execute the steps of the method for adjusting the RC time constant of a DC voltage divider according to any one of claims 1 to 5.

8. A computer-readable storage medium storing a program, characterized in that: When the program is executed by a processor, the steps of the method for adjusting the RC time constant of a DC voltage divider as described in any one of claims 1 to 5 are implemented.

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