A method and system for optimizing a reactor

Abstract

This invention provides a reactor optimization method and system, belonging to the field of reactor technology. The method includes: obtaining the inter-terminal capacitance, the capacitance between the incoming and outgoing lines to ground, and the capacitance between the outgoing lines to ground of the target reactor; obtaining the inter-terminal capacitance-to-ground ratio based on the inter-terminal capacitance and the outgoing line capacitance to ground, and obtaining the connection capacitance ratio based on the capacitance between the incoming and outgoing lines to ground; obtaining the peak value of an intruding lightning surge, and obtaining the peak inter-terminal voltage based on the inter-terminal capacitance-to-ground ratio, the connection capacitance ratio, and the peak value of the intruding lightning surge; generating an optimized inter-terminal capacitance-to-ground ratio and an optimized connection capacitance ratio based on the peak inter-terminal voltage within a preset safe range; and optimizing the target reactor structure based on the optimized inter-terminal capacitance-to-ground ratio and the optimized connection capacitance ratio. This invention enables the peak inter-terminal voltage of the reactor to be precisely limited within a safe range when subjected to a lightning surge, achieving precise control of the reactor's external insulation safety margin.

Description

Technical Field

[0001] This invention relates to the field of reactor technology, and in particular to a reactor optimization method and system. Background Technology

[0002] Pole smoothing reactors are core main equipment for DC transmission, and their operational performance determines the safety and stability of DC transmission projects. Traditional solutions generally use fixed engineering experience coefficients to determine the external insulation withstand voltage of each series reactor. As DC transmission projects extend to higher altitudes, the reduced air density at high altitudes significantly affects the external insulation withstand voltage level. If traditional solutions are still used, insufficient insulation levels may occur in extreme cases, leading to equipment insulation damage. Furthermore, traditional solutions cannot optimize reactor structure based on operating conditions and environment to improve the external insulation safety margin, making it difficult to adapt to the actual needs of different operating conditions and altitude environments.

[0003] To address the aforementioned issues, existing technologies disclose the establishment of electromagnetic transient simulation models to select the most stringent waveforms and construct multiple lightning current sources. A broadband equivalent circuit model of the reactor is then built to simulate lightning strikes on lines of the same polarity, initially determining the reactor inductance value. Next, the overvoltage from a reverse-polarity lightning impulse on the DC submarine cable is evaluated to determine if it exceeds the tolerance range. The optimal inductance value is then selected to ensure the DC submarine cable meets the requirements for reverse-polarity lightning impulse voltage, thus identifying the best solution for overvoltage suppression and ensuring the surge arrester's electrical stress meets requirements. However, this existing technology fails to fully consider the impact of the difference between the reactor's inter-terminal capacitance and stray capacitance to ground on the voltage distribution between series reactors. It also fails to provide a quantitative assessment of inter-terminal insulation stress and a solution to guide reactor structure optimization. Consequently, when facing varying requirements under different operating conditions and altitudes, it is difficult to accurately set the reactor structure and precisely control the external insulation safety margin. Summary of the Invention

[0004] The present invention aims to provide a reactor optimization method, system and equipment to solve the above-mentioned technical problems and achieve precise control of the safety margin of the external insulation of the reactor.

[0005] To address the aforementioned technical problems, this invention provides a reactor optimization method, comprising the following steps: Obtain the inter-terminal capacitance, input-output line connection-to-ground capacitance, and output-to-ground capacitance of the target reactor; The inter-terminal capacitance to ground ratio is obtained based on the inter-terminal capacitance and the outgoing line to ground capacitance, and the connection capacitance ratio is obtained based on the incoming and outgoing line connection to ground capacitance and the outgoing line to ground capacitance. The peak value of the intruding lightning wave is obtained, and the peak value of the inter-terminal voltage is obtained based on the inter-terminal capacitance ratio to ground, the connection capacitance ratio, and the peak value of the intruding lightning wave. Within a preset safety range, an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio are generated based on the peak inter-terminal voltage. The target reactor structure is optimized based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio.

[0006] The above scheme first obtains the inter-terminal capacitance, the inlet-outlet connection-to-ground capacitance, and the outlet-to-ground capacitance, which determine the charge distribution relationship of the reactor under the action of lightning surge. Then, based on the above capacitances, the inter-terminal-to-ground capacitance ratio and the connection capacitance ratio are obtained, which characterize the relative strength of the reactor's own inter-terminal energy storage and ground leakage path, so as to quantitatively describe the degree of voltage imbalance. Subsequently, based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the lightning surge, this scheme obtains the inter-terminal voltage peak value, which is the maximum value of the lightning impulse voltage actually borne by the reactor terminals. It reflects the stress level borne by the reactor's external insulation. Based on this inter-terminal voltage peak value, the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio that make the inter-terminal voltage peak value fall within the preset safety range can be deduced. Finally, based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio, this scheme optimizes the target reactor structure, which can accurately limit the inter-terminal voltage peak value of the reactor when subjected to lightning surge to within the safe range, and realize precise control of the safety margin of the reactor's external insulation.

[0007] Further, the step of obtaining the peak value of the intruding lightning wave and obtaining the peak value of the inter-terminal voltage based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave includes: obtaining the altitude of the target reactor and the initial peak value of the intruding lightning wave, and generating a high-altitude correction coefficient based on the altitude; correcting the initial peak value of the intruding lightning wave based on the high-altitude correction coefficient to obtain the peak value of the intruding lightning wave; and obtaining the peak value of the inter-terminal voltage based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave.

[0008] Because air density decreases at high altitudes, the external insulation discharge voltage drops accordingly. Directly using the initial peak value of an intruding lightning surge under low-altitude conditions would significantly reduce the accuracy of the inter-terminal voltage peak value, which reflects the actual insulation stress level experienced by the reactor terminals under high-altitude operating conditions. Therefore, the above scheme generates a high-altitude correction coefficient based on altitude. This correction coefficient ensures that the corrected intruding lightning surge peak value accurately represents the true intensity of the lightning surge's effect on the reactor's external insulation under actual altitude conditions. This improves the accuracy of the obtained inter-terminal voltage peak value, preventing subsequent reactor structure optimization from being unsuitable for the actual altitude environment due to neglecting altitude factors, and achieving precise control over the reactor's external insulation safety margin.

[0009] Further, the step of generating an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio based on the peak value of the inter-terminal voltage within a preset safety range includes: if the peak value of the inter-terminal voltage is confirmed to be within the preset safety range, then the inter-terminal-to-ground capacitance ratio is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under a preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio.

[0010] The above scheme first confirms whether the peak value of the inter-terminal voltage falls within the preset safety range. If the peak value is within this range, it indicates that the current reactor structure meets the safety margin requirements. The current inter-terminal-to-ground capacitance ratio is then used as the optimized inter-terminal-to-ground capacitance ratio, and the current connection capacitance ratio is used as the optimized connection capacitance ratio to avoid redundant structural modifications. Furthermore, if the peak value of the inter-terminal voltage does not fall within the preset safety range, it indicates that the current safety margin is insufficient. The capacitance ratio needs to be actively adjusted to reduce the peak value of the inter-terminal voltage, which reflects the stress level borne by the reactor's external insulation. Specifically, the inter-terminal-to-ground capacitance ratio is increased under the preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, thereby increasing the reactor's inter-terminal capacitance. Simultaneously, the connection capacitance ratio is decreased under the preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio, thereby reducing the connection-to-ground capacitance of the incoming and outgoing lines. This causes the peak value of the inter-terminal voltage to converge into the preset safety range, achieving precise control of the external insulation safety margin.

[0011] Furthermore, optimizing the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio includes: adjusting the inter-terminal capacitance of the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio; adjusting the installation distance or wiring method between the intermediate node and ground of the target reactor structure based on the optimized connection capacitance ratio; and canceling the surge arrester of the target reactor structure if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range and within a preset range where no surge arrester is required.

[0012] The above scheme adjusts the inter-terminal capacitance of the target reactor structure based on optimizing the inter-terminal-to-ground capacitance ratio. This increases the inter-terminal capacitance, enhancing the charge storage capacity at the reactor ends. Under the influence of lightning surges, more charge is confined between the terminals rather than flowing to ground through stray capacitance, thereby reducing the peak inter-terminal voltage and thus reducing the insulation stress between terminals. Furthermore, this scheme adjusts the installation distance or wiring method between the intermediate node and ground of the target reactor structure based on optimizing the connection capacitance ratio. Increasing the installation distance between the intermediate node and ground reduces the capacitance to ground of the incoming and outgoing lines, or reducing the connection capacitance ratio by changing the wiring method, can reduce the charge leakage path from the intermediate node to ground, thereby further reducing the peak inter-terminal voltage and thus reducing the insulation stress between terminals. The above synergistic adjustment reduces the peak inter-terminal voltage, allowing the stress level borne by the external insulation to be precisely controlled within a preset safe range. Furthermore, after the above structural adjustments are completed, if it is confirmed that the peak voltage between terminals simultaneously meets the preset safety range and the preset range where surge arresters are not required, it indicates that the external insulation of the reactor body has sufficient withstand capability, and it no longer needs to rely on parallel surge arresters for additional protection. Therefore, the surge arresters in the target reactor structure are eliminated, which reduces the redundant surge arrester protection settings while ensuring the safe operation of the reactor, and improves the precise control of the external insulation safety margin.

[0013] Further, if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under a preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio. The process of increasing the inter-terminal-to-ground capacitance ratio under the preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and decreasing the connection capacitance ratio under the preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio, includes: performing a coarse adjustment step based on the inter-terminal-to-ground capacitance ratio and the connection capacitance ratio to generate an optimized inter-terminal-to-ground capacitance ratio. The coarse adjustment step includes: increasing the inter-terminal-to-ground capacitance ratio under a preset inter-terminal capacitance ratio constraint to generate an increased inter-terminal-to-ground capacitance ratio, and decreasing the connection capacitance ratio under a preset connection capacitance ratio constraint to generate a decreased connection capacitance ratio; obtaining the coarse-adjusted inter-terminal voltage peak based on the increased inter-terminal-to-ground capacitance ratio and the decreased connection capacitance ratio; if it is confirmed that the coarse-adjusted inter-terminal voltage peak is not within a preset safety range, then the increased inter-terminal-to-ground capacitance ratio is used as the inter-terminal-to-ground capacitance ratio, and the decreased connection capacitance ratio is used as the connection capacitance ratio, and the coarse adjustment step is re-executed; otherwise, the coarse adjustment step is stopped, and the increased inter-terminal-to-ground capacitance ratio is used as the optimized inter-terminal-to-ground capacitance ratio, and the decreased connection capacitance ratio is used as the optimized connection capacitance ratio.

[0014] In the coarse adjustment step, the above scheme first increases the inter-terminal-to-ground capacitance ratio under a preset inter-terminal capacitance ratio constraint, generating an increased inter-terminal-to-ground capacitance ratio. Simultaneously, it decreases the connection capacitance ratio under a preset connection capacitance ratio constraint, generating a decreased connection capacitance ratio. This gradually converges the peak value of the coarse-adjusted inter-terminal voltage within the safe range. If the peak value of the coarse-adjusted inter-terminal voltage is not within the preset safe range, the coarse adjustment step is repeated based on the increased inter-terminal-to-ground capacitance ratio and the decreased connection capacitance ratio to further approximate the safe range. This process ensures that the capacitance ratio value can be precisely converged to near the critical value of the safe range, thereby achieving precise control of the safety margin of the reactor's external insulation.

[0015] Further, obtaining the inter-terminal capacitance, input-output line connection to ground capacitance, and output line to ground capacitance of the target reactor includes: obtaining the number of turns, single-turn length, inner and outer diameters of the conductors, ground-mapped area, and ground height of the target reactor, and establishing a series reactor capacitor voltage divider model based on the target reactor; obtaining the inter-terminal capacitance based on the number of turns, single-turn length, inner and outer diameters of the conductors, and the series reactor capacitor voltage divider model; and obtaining the input-output line connection to ground capacitance and output line to ground capacitance based on the ground-mapped area, ground height, and the series reactor capacitor voltage divider model.

[0016] The number of turns, single-turn length, and inner and outer diameters of the conductors obtained by the above scheme determine the geometric dimensions and spatial extension range of the winding conductors. By combining this structural data of the reactor with the capacitor voltage divider model of a series reactor, the equivalent capacitance between adjacent turns and between the ends of the entire winding can be accurately determined, thus obtaining the inter-terminal capacitance. Furthermore, this scheme also obtains the ground-mapped area, which characterizes the size of the projection area of ​​each conductive part of the reactor onto the ground plane, and the ground-mounted height, which characterizes the distance between the conductive part and the ground. By combining the ground-mapped area and ground-mounted height with the capacitor voltage divider model of a series reactor, the input line connection to ground capacitance and the output line to ground capacitance can be obtained. This allows the subsequently obtained inter-terminal to ground capacitance ratio and connection capacitance ratio to accurately reflect the charge distribution characteristics of the reactor under the actual structure, thereby improving the accuracy of the subsequently obtained optimized inter-terminal to ground capacitance ratio and optimized connection capacitance ratio. This improves the accuracy of reactor structural optimization and adjustment, and enables precise control of the reactor's external insulation safety margin.

[0017] This invention also provides a reactor optimization system for implementing any of the reactor optimization methods described above, comprising: a reactor capacitance acquisition module for acquiring the inter-terminal capacitance, the input / output line connection to ground capacitance, and the output line to ground capacitance of the target reactor; a capacitance ratio acquisition module for acquiring the inter-terminal to ground capacitance ratio based on the inter-terminal capacitance and the output line to ground capacitance, and acquiring the connection capacitance ratio based on the input / output line connection to ground capacitance and the output line to ground capacitance; an inter-terminal voltage peak value acquisition module for acquiring the peak value of an intruding lightning surge, and obtaining the inter-terminal voltage peak value based on the inter-terminal to ground capacitance ratio, the connection capacitance ratio, and the intruding lightning surge peak value; an optimized capacitance ratio acquisition module for generating an optimized inter-terminal to ground capacitance ratio and an optimized connection capacitance ratio based on the inter-terminal voltage peak value within a preset safe range; and a reactor structure optimization module for optimizing the target reactor structure based on the optimized inter-terminal to ground capacitance ratio and the optimized connection capacitance ratio.

[0018] Furthermore, the inter-terminal voltage peak acquisition module specifically includes: acquiring the altitude of the target reactor and the initial peak value of the intruding lightning wave, and generating a high-altitude correction coefficient based on the altitude; correcting the initial peak value of the intruding lightning wave according to the high-altitude correction coefficient to obtain the peak value of the intruding lightning wave; and obtaining the inter-terminal voltage peak value based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave.

[0019] Furthermore, the optimized capacitance ratio acquisition module specifically includes: if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under the preset inter-terminal capacitance ratio constraint to generate the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under the preset connection capacitance ratio constraint to generate the optimized connection capacitance ratio.

[0020] Furthermore, the reactor structure optimization module specifically includes: adjusting the inter-terminal capacitance of the target reactor structure according to the optimized inter-terminal-to-ground capacitance ratio; adjusting the installation distance or wiring method between the intermediate node and ground of the target reactor structure according to the optimized connection capacitance ratio; and canceling the surge arrester of the target reactor structure if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range and within a preset range where no surge arrester is required.

[0021] The above-mentioned scheme, after obtaining the inter-terminal capacitance, inlet-outlet connection-to-ground capacitance, and outlet-to-ground capacitance that determine the charge distribution relationship of the reactor under the action of lightning surge, obtains the corresponding inter-terminal-to-ground capacitance ratio and connection capacitance ratio to quantitatively describe the degree of voltage imbalance. This scheme then obtains the inter-terminal voltage peak value, which is the maximum value of the lightning impulse voltage actually borne by the reactor terminals, based on the inter-terminal voltage peak value. Based on this inter-terminal voltage peak value, the optimized inter-terminal-to-ground capacitance ratio and optimized connection capacitance ratio that make the inter-terminal voltage peak value fall within the preset safe range are derived in reverse. Finally, this scheme optimizes the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and optimized connection capacitance ratio, so that the inter-terminal voltage peak value of the reactor can be precisely limited within the safe range when subjected to lightning surge, thus realizing precise control of the safety margin of the reactor's external insulation. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a flowchart illustrating the technical implementation of a reactor optimization method according to an embodiment of the present invention. Figure 2 A series reactor capacitor voltage divider model is provided as an embodiment of the present invention for a reactor optimization method; Figure 3 This is a schematic diagram of a conventional poleline reactor arrangement provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the optimized arrangement of poleline reactors according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a reactor optimization system architecture provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0031] Please see Figure 1 This embodiment provides a reactor optimization method, including the following steps: Step S1: Obtain the inter-terminal capacitance, input-output line connection-to-ground capacitance, and output-output line-to-ground capacitance of the target reactor; Step S2: Obtain the inter-terminal to ground capacitance ratio based on the inter-terminal capacitance and the outgoing line to ground capacitance, and obtain the connection capacitance ratio based on the incoming and outgoing line connection to ground capacitance and the outgoing line to ground capacitance; Step S3: Obtain the peak value of the intruding lightning wave, and obtain the peak value of the inter-terminal voltage based on the inter-terminal capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave; Step S4: Within a preset safety range, generate an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio based on the peak inter-terminal voltage. Step S5: Optimize the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio.

[0032] The above embodiment first obtains the inter-terminal capacitance, the inlet-outlet connection-to-ground capacitance, and the outlet-to-ground capacitance, which determine the charge distribution relationship of the reactor under the action of lightning surge. Then, based on the above capacitances, the inter-terminal-to-ground capacitance ratio and the connection capacitance ratio are obtained, which characterize the relative strength of the reactor's own inter-terminal energy storage and ground leakage path, so as to quantitatively describe the degree of voltage imbalance. Subsequently, this embodiment obtains the inter-terminal voltage peak value, which is the maximum value of the lightning impulse voltage actually borne by the reactor terminals, based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the lightning surge. This reflects the stress level borne by the reactor's external insulation. Based on this inter-terminal voltage peak value, the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio that can make the inter-terminal voltage peak value fall within the preset safety range can be deduced. Finally, this embodiment optimizes the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio, so that the inter-terminal voltage peak value of the reactor under the lightning surge is precisely limited to the safety range, and the safety margin of the reactor's external insulation is precisely controlled.

[0033] To analyze the relationship between voltage division and each capacitor in order to assess and determine the external insulation level of the reactor, this embodiment introduces two dimensionless parameters: the inter-terminal capacitance to ground ratio. and connection capacitor ratio ,and: ; ; in, Inter-terminal capacitance; This refers to the capacitance between the outgoing line and ground. Connect the incoming and outgoing lines to ground capacitors. Obtain the peak value of the intruding lightning surge. And based on the inter-terminal capacitance to ground ratio Connection capacitor ratio and peak value of intruding lightning waves Obtain the peak value of the inter-terminal voltage The peak value of the inter-terminal voltage is obtained. As shown in the following formula: ; It can be seen that the inter-terminal capacitance to ground is greater than that of the inter-terminal capacitance to ground. With the connection capacitance remaining constant, The larger the capacitance, the larger the peak voltage between terminals, i.e., the larger the voltage drop; conversely, the smaller the capacitance, the larger the voltage drop. The smaller the value, the smaller the peak voltage between terminals, meaning a smaller voltage drop. Furthermore, the capacitance ratio is also smaller. Under the condition that remains unchanged, the inter-terminal capacitance to ground is compared with The larger the value, the smaller the peak voltage between terminals, i.e., the smaller the voltage drop; conversely, the smaller the capacitance between terminals to ground. The smaller the value, the larger the peak voltage between terminals, i.e., the larger the voltage drop.

[0034] In one embodiment, the preset safety zone is set to If the peak inter-terminal voltage is within the preset safety range, it indicates that all reactors have achieved voltage equalization, meeting the reactor's safety and stability requirements, and no further adjustment of the inter-terminal-to-ground capacitance ratio and connection capacitance ratio is needed to adapt to the safety margin requirements. However, if the peak inter-terminal voltage is not within the preset safety range, it indicates insufficient safety margin, requiring an increase in the inter-terminal-to-ground capacitance ratio and a decrease in the connection capacitance ratio. Based on the optimized inter-terminal-to-ground capacitance ratio and connection capacitance ratio obtained above, the target reactor structure is optimized and adjusted to ensure that the peak inter-terminal voltage converges within the preset safety range, reducing voltage imbalance among the reactors and improving the external insulation safety margin.

[0035] Further, the step of obtaining the peak value of the intruding lightning wave and obtaining the peak value of the inter-terminal voltage based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave includes: obtaining the altitude of the target reactor and the initial peak value of the intruding lightning wave, and generating a high-altitude correction coefficient based on the altitude; correcting the initial peak value of the intruding lightning wave based on the high-altitude correction coefficient to obtain the peak value of the intruding lightning wave; and obtaining the peak value of the inter-terminal voltage based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave.

[0036] Because air density decreases at high altitudes, the external insulation discharge voltage also decreases. Directly using the initial peak value of an intruding lightning wave under low-altitude conditions would significantly reduce the accuracy of the inter-terminal voltage peak value, which reflects the actual insulation stress level experienced by the reactor terminals under high-altitude operating conditions. Therefore, the above embodiment generates a high-altitude correction coefficient based on altitude. This correction coefficient ensures that the corrected intruding lightning wave peak value accurately represents the true intensity of the lightning intrusion wave's effect on the reactor's external insulation under actual altitude conditions. This improves the accuracy of the obtained inter-terminal voltage peak value, preventing subsequent reactor structure optimization from being unsuitable for the actual altitude environment due to neglecting altitude factors, and achieving precise control of the reactor's external insulation safety margin.

[0037] In one embodiment, the altitude of the target reactor is obtained. and the initial peak value of the intruding lightning wave And based on altitude Generate high altitude correction factor As shown in the following formula: ; Then, based on this high altitude correction factor Initial peak value of intruding lightning wave After correction, the peak value of the intruding lightning wave was obtained. .

[0038] Further, the step of generating an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio based on the peak value of the inter-terminal voltage within a preset safety range includes: if the peak value of the inter-terminal voltage is confirmed to be within the preset safety range, then the inter-terminal-to-ground capacitance ratio is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under a preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio.

[0039] The above embodiment first confirms whether the peak value of the inter-terminal voltage falls within a preset safety range. If the peak value of the inter-terminal voltage falls within this safety range, it indicates that the current reactor structure meets the safety margin requirements. The current inter-terminal-to-ground capacitance ratio is then used as the optimized inter-terminal-to-ground capacitance ratio, and the current connection capacitance ratio is used as the optimized connection capacitance ratio to avoid redundant structural modifications. Furthermore, in this embodiment, if the peak value of the inter-terminal voltage does not fall within the preset safety range, it indicates that the current safety margin is insufficient. The capacitance ratio needs to be actively adjusted to reduce the peak value of the inter-terminal voltage, which reflects the stress level borne by the reactor's external insulation. Specifically, the inter-terminal-to-ground capacitance ratio is increased under the constraint of a preset inter-terminal capacitance ratio to generate an optimized inter-terminal-to-ground capacitance ratio, thereby increasing the reactor's inter-terminal capacitance. Simultaneously, the connection capacitance ratio is decreased under the constraint of a preset connection capacitance ratio to generate an optimized connection capacitance ratio, thereby reducing the connection capacitance to ground of the incoming and outgoing lines. This causes the peak value of the inter-terminal voltage to converge into the preset safety range, achieving precise control of the external insulation safety margin.

[0040] Furthermore, optimizing the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio includes: adjusting the inter-terminal capacitance of the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio; adjusting the installation distance or wiring method between the intermediate node and ground of the target reactor structure based on the optimized connection capacitance ratio; and canceling the surge arrester of the target reactor structure if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range and within a preset range where no surge arrester is required.

[0041] The above embodiments adjust the inter-terminal capacitance of the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio, which increases the inter-terminal capacitance and enhances the charge storage capacity at the reactor ends. This allows more charge to be confined between the terminals under the influence of lightning surge waves rather than flowing to ground through stray capacitance, thereby reducing the peak inter-terminal voltage and reducing the insulation stress between the terminals. Furthermore, this embodiment adjusts the installation distance or wiring method between the intermediate node and ground of the target reactor structure based on the optimized connection capacitance ratio. Increasing the installation distance between the intermediate node and ground reduces the connection capacitance to ground of the incoming and outgoing lines, or reducing the connection capacitance ratio by changing the wiring method, can reduce the charge leakage path from the intermediate node to ground, thereby further reducing the peak inter-terminal voltage and reducing the insulation stress between the terminals. The above synergistic adjustment reduces the peak inter-terminal voltage, allowing the stress level borne by the external insulation to be precisely controlled within a preset safe range. Furthermore, in this embodiment, after the above structural adjustments are completed, if it is confirmed that the peak voltage between terminals simultaneously meets the preset safety range and the preset range where surge arresters are not required, it indicates that the external insulation of the reactor body has sufficient withstand capability, and it no longer needs to rely on parallel surge arresters for additional protection. Therefore, the surge arresters of the target reactor structure are eliminated, so as to reduce the redundant surge arrester protection settings while ensuring the safe operation of the reactor, and improve the precise control of the external insulation safety margin.

[0042] In one embodiment, if the peak value of the inter-terminal voltage is within a preset safe range, the obtained optimized inter-terminal-to-ground capacitance ratio is consistent with the current inter-terminal-to-ground capacitance ratio, and the obtained optimized connection capacitance ratio is consistent with the current connection capacitance ratio. In this case, there is no change in the optimization adjustment of the target reactor structure.

[0043] If the peak value of the inter-terminal voltage is not within the preset safe range, the optimized inter-terminal-to-ground capacitance ratio is larger than the current inter-terminal-to-ground capacitance ratio, and the optimized connection capacitance ratio is smaller than the current connection capacitance ratio. In this case, to correspond to the increased inter-terminal-to-ground capacitance, the inter-terminal capacitance of the target reactor structure is adjusted according to the optimized inter-terminal-to-ground capacitance ratio, which will increase the inter-terminal capacitance of the target reactor structure. Specifically, this can be achieved by setting necessary equalizing rings at both ends of the reactor. In this case, to correspond to the decreased connection capacitance ratio, the installation distance or wiring method between the intermediate node and ground of the target reactor structure is adjusted according to the optimized connection capacitance ratio to increase the installation distance between the intermediate node and ground, reduce the connection capacitance between the incoming and outgoing lines to ground, or change the wiring method. Specifically, this can be achieved by changing the wiring method of the reactor outgoing line to ground capacitance or changing the wiring method of the stray capacitance to ground at the location where the reactor is connected to the intruding lightning wave.

[0044] Furthermore, considering the potential deviations in the obtained capacitor parameters, a certain safety margin needs to be taken into account. Therefore, in this embodiment, after confirming that the peak voltage between terminals is within a preset safety range, and when set to... Only after the preset range of no surge arresters is determined can the optimization of surge arresters for eliminating the target reactor structure be carried out, that is, to eliminate the parallel surge arresters on the reactor and reduce costs.

[0045] Further, if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under a preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio. The process of increasing the inter-terminal-to-ground capacitance ratio under the preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and decreasing the connection capacitance ratio under the preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio, includes: performing a coarse adjustment step based on the inter-terminal-to-ground capacitance ratio and the connection capacitance ratio to generate an optimized inter-terminal-to-ground capacitance ratio. The coarse adjustment step includes: increasing the inter-terminal-to-ground capacitance ratio under a preset inter-terminal capacitance ratio constraint to generate an increased inter-terminal-to-ground capacitance ratio, and decreasing the connection capacitance ratio under a preset connection capacitance ratio constraint to generate a decreased connection capacitance ratio; obtaining the coarse-adjusted inter-terminal voltage peak based on the increased inter-terminal-to-ground capacitance ratio and the decreased connection capacitance ratio; if it is confirmed that the coarse-adjusted inter-terminal voltage peak is not within a preset safety range, then the increased inter-terminal-to-ground capacitance ratio is used as the inter-terminal-to-ground capacitance ratio, and the decreased connection capacitance ratio is used as the connection capacitance ratio, and the coarse adjustment step is re-executed; otherwise, the coarse adjustment step is stopped, and the increased inter-terminal-to-ground capacitance ratio is used as the optimized inter-terminal-to-ground capacitance ratio, and the decreased connection capacitance ratio is used as the optimized connection capacitance ratio.

[0046] In the coarse adjustment step of the above embodiment, the inter-terminal-to-ground capacitance ratio is first increased under a preset inter-terminal capacitance ratio constraint, generating an increased inter-terminal-to-ground capacitance ratio. Simultaneously, the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint, generating a decreased connection capacitance ratio. This causes the peak value of the coarse-adjusted inter-terminal voltage to gradually converge within the safe range. If the peak value of the coarse-adjusted inter-terminal voltage is not within the preset safe range, the coarse adjustment step is repeated based on the increased inter-terminal-to-ground capacitance ratio and the decreased connection capacitance ratio to further approach the safe range. This process in the above embodiment enables the capacitance ratio to be precisely converged to near the critical value of the safe range, thereby achieving precise control of the safety margin of the reactor's external insulation.

[0047] Further, obtaining the inter-terminal capacitance, input-output line connection to ground capacitance, and output line to ground capacitance of the target reactor includes: obtaining the number of turns, single-turn length, inner and outer diameters of the conductors, ground-mapped area, and ground height of the target reactor, and establishing a series reactor capacitor voltage divider model based on the target reactor; obtaining the inter-terminal capacitance based on the number of turns, single-turn length, inner and outer diameters of the conductors, and the series reactor capacitor voltage divider model; and obtaining the input-output line connection to ground capacitance and output line to ground capacitance based on the ground-mapped area, ground height, and the series reactor capacitor voltage divider model.

[0048] The number of turns, single-turn length, and inner and outer diameters of the conductors obtained in the above embodiments determine the geometric dimensions and spatial extension range of the winding conductors. By combining this structural data of the reactor with the capacitor voltage divider model of a series reactor, the equivalent capacitance between adjacent turns and between the ends of the entire winding can be accurately determined to obtain the inter-terminal capacitance. In addition, this embodiment also obtains the ground-mapped area, which characterizes the size of the projection area of ​​each conductive part of the reactor onto the ground plane, and the ground-mounted height, which characterizes the distance between the conductive part and the ground. By combining the ground-mapped area and ground-mounted height with the capacitor voltage divider model of a series reactor, the inlet-outlet connection-to-ground capacitance and the outlet-to-ground capacitance can be obtained. This allows the subsequently obtained inter-terminal-to-ground capacitance ratio and connection capacitance ratio to accurately reflect the charge distribution characteristics of the reactor under the actual structure, thereby improving the accuracy of the subsequently obtained optimized inter-terminal-to-ground capacitance ratio and optimized connection capacitance ratio. This improves the accuracy of the reactor structure optimization and adjustment, and achieves precise control of the reactor's external insulation safety margin.

[0049] Taking the series reactor capacitive voltage divider model, which splits the pole line reactor into two transient equivalent models, as an example, the series reactor capacitive voltage divider model is as follows: Figure 2 As shown, this model is used to analyze the impact of electromagnetic waves and the initial potential distribution at key locations of the reactor.

[0050] and Figure 2 middle, For intruding lightning waves; For the peak value of the intruding lightning wave; This is the ground potential at the location where the first reactor is connected to the intruding lightning surge, and ; This refers to the ground potential at the connection point between the outgoing line of the first reactor and the incoming line of the second reactor. This is the ground potential at the output position of the second reactor; and These are the stray capacitances between the start and end terminals of the first and second reactors, respectively. Considering engineering interchangeability requirements, then... ; and The inductances of the first reactor and the second reactor are respectively. ; and The inductances of the first reactor and the second reactor are respectively. ; The stray capacitance to ground at the location where the first reactor is connected to the intruding lightning wave; The stray capacitance to ground at the connection point between the outgoing line of the first reactor and the incoming line of the second reactor is the ground capacitance at the connection point between the outgoing and incoming lines. ; The stray capacitance to ground at the output location of the second reactor is the output-to-ground capacitance. ; The equivalent resistance to ground at the location where the first reactor is connected to the intruding lightning wave; The equivalent resistance to ground at the connection point of the outgoing line of the first reactor and the incoming line of the second reactor; This is the equivalent resistance to ground at the output position of the second reactor.

[0051] exist Under the action of a standard lightning shock wave, Figure 2 In the capacitor-divided voltage divider model of the series reactor shown, the inductance and resistance are approximately open-circuited at the instant of the wavefront, and their influence is negligible. Therefore, the initial distribution of the transient voltage is mainly determined by the capacitor network. Thus, for two series-connected pole reactors, according to the KCL (Kirchhoff's Current Law) equation: ; ; Therefore, we can conclude that: ; ; in, The peak voltage between the first and last terminals of the first reactor is the inter-terminal peak voltage. ; This represents the peak voltage between the first and last terminals of the second reactor. It can be seen that in the initial voltage distribution of a lightning strike, [the voltage is consistently...]. This means that the voltage drop across the first reactor will be higher than that across the second reactor, resulting in an uneven voltage distribution.

[0052] And combined Figure 2 The capacitor voltage divider model of the series reactor shown includes the stray capacitance between the first and last terminals of the first reactor. It can be obtained through the following formula: ; in, This refers to the number of turns corresponding to the first reactor. This is the single-turn length corresponding to the first reactor; and As the inner and outer diameters of the conductor corresponding to the first reactor, and This refers to the outer diameter of the conductor corresponding to the first reactor. This is the inner diameter of the conductor corresponding to the first reactor; The vacuum permittivity, is the relative permittivity of the insulation material between the turns of the conductor.

[0053] Stray capacitance between the first and last terminals of the second reactor It can be obtained through the following formula: ; in, This refers to the number of turns corresponding to the second reactor; This is the single-turn length corresponding to the second reactor; and As the inner and outer diameters of the conductor corresponding to the second reactor, and This refers to the outer diameter of the conductor corresponding to the second reactor. This is the inner diameter of the conductor corresponding to the second reactor; The vacuum permittivity, is the relative permittivity of the insulation material between the turns of the conductor.

[0054] It should be noted that in the initial voltage distribution of lightning impulses Therefore, the voltage drop across the first reactor will be higher than that of the second, resulting in an uneven voltage distribution. Furthermore, due to interchangeability requirements, poleline DC reactors typically require identical coils for both. , denoted as inter-terminal capacitance .

[0055] And combined Figure 2 The series reactor capacitive voltage divider model shown includes the stray capacitance to ground at the location where the first reactor is connected to the intruding lightning wave. It can be obtained through the following formula: ; in, The ground-mapped area corresponding to the location where the first reactor is connected to the intruding lightning wave; This refers to the ground height at the point where the first reactor connects to the incoming lightning surge. The stray capacitance to ground at the connection point between the outgoing line of the first reactor and the incoming line of the second reactor is also known as the ground capacitance of the incoming-outgoing line connection. It can be obtained through the following formula: ; in, The ground-mapped area corresponding to the connection position of the outgoing line of the first reactor and the incoming line of the second reactor; This refers to the ground height corresponding to the connection position of the outgoing line of the first reactor and the incoming line of the second reactor.

[0056] The stray capacitance to ground at the output line location of the second reactor is the output line-to-ground capacitance. It can be obtained through the following formula: ; in, This represents the ground-mapped area corresponding to the output position of the second reactor. This refers to the ground clearance corresponding to the output position of the second reactor.

[0057] In one embodiment, the above , , , and All of these can be obtained directly using finite element software such as ANSYS Maxwell or COMSOL.

[0058] Furthermore, in order to analyze the relationship between the voltage divider and each capacitor, and to assess and determine the external insulation level of the reactor, this embodiment introduces the inter-terminal-to-ground capacitance ratio. and connection capacitor ratio ,and: ; ; in, Inter-terminal capacitance; This refers to the capacitance between the outgoing line and ground. A capacitor is connected to ground for the incoming and outgoing lines. The resulting peak inter-terminal voltage is... Peak voltage between the first and last terminals of the second reactor As shown in the following formula: ; ; Because polarized reactors are characterized by a large number of turns—sometimes hundreds—with a turn insulation thickness of less than 1mm, and an actual ground clearance ranging from several meters to twenty meters, the inter-terminal capacitance is significant. It will generally be greater than the capacitance to ground of the outgoing line. Connect the input and output lines to the ground capacitor ,Right now .from Figure 3 As shown in the schematic diagram of the pole line reactor arrangement, the input and output lines are connected to the ground capacitor. The actual capacitance is the sum of the capacitances of the two coils connected in parallel to ground at their bottoms, and the height of these capacitances to ground is lower than the height of the coil tops to ground, satisfying the condition... ,Right now A typical value for k is 2.

[0059] In one embodiment, since the above discussion has already explained that always When analyzing the safety conditions of reactor voltage division, only the peak value of the inter-terminal voltage needs to be discussed. And the preset inter-terminal capacitance ratio constraint is determined to be The preset connection capacitance ratio constraint is as follows: .

[0060] Under the above constraints, if fixed ,get The critical partial pressure conditions corresponding to the changes are shown in the table below: It is evident that, at the current altitude, the peak value of the inter-terminal voltage is... The maximum achievable partial pressure is 0.78. If the reactor optimization is based on a fixed empirical coefficient of 0.60 used in traditional methods, insufficient safety margins may occur, potentially even causing equipment damage. Furthermore, due to stray capacitance to ground at intermediate nodes and outgoing terminals, some charge flows to ground via these capacitances. The difference is the voltage drop across the ground capacitance, which conforms to the physical law of capacitance voltage drop, and the result obtained is reasonable.

[0061] And if the peak value of the inter-terminal voltage exist Within a preset safe range, its voltage divider value is considered a safe value, and it satisfies the corresponding condition within that preset safe range. and The values ​​are shown in the table below: And the peak value of the inter-terminal voltage Within the preset safety range, and satisfying the condition of being set to The preset does not require the corresponding surge arrester range. and The values ​​are shown in the table below: If the peak value of the inter-terminal voltage If the circuit falls within the range where surge arresters are not required, the parallel surge arresters on the reactor can be eliminated when optimizing the reactor structure, thus reducing costs.

[0062] Since the voltage imbalance between the two reactors is mainly caused by the capacitance to ground, if the peak voltage between terminals is not within the preset safe range and the external insulation safety margin is insufficient, it can be addressed by increasing the voltage level. Value and decrease The value is adjusted to maximize the inter-terminal capacitance and minimize the capacitance to ground, thereby increasing the external insulation safety margin without altering the basic structure of the existing two series reactors.

[0063] In one embodiment, for optimizing the inter-terminal-to-ground capacitance ratio, i.e. for increasing... The value is increased by increasing the inter-terminal capacitance of the reactor. To achieve this, for example, by installing necessary equalizing rings at both ends of the reactor to improve... The value of is reduced value.

[0064] In one embodiment, for optimizing the connection capacitance ratio, i.e. for reducing The value is increased by increasing the installation distance between the intermediate node and the ground, thereby reducing the stray capacitance of the intermediate node to ground, which in turn reduces the capacitance of the incoming and outgoing line connections to ground. Thus reducing The value of is further reduced. Maximum value; and the conventional wiring method can be changed to, for example Figure 4 The wiring method shown in the schematic diagram of the optimized arrangement of pole line reactors. Figure 4 Compared to the wiring method shown Figure 3 As shown, this can increase the safety margin by approximately 10%.

[0065] Furthermore, considering the potential deviations in the obtained capacitor parameters, a certain safety margin needs to be considered. In this embodiment, the peak voltage between terminals is confirmed to be within a preset safety range, and is set to... Only after the preset range of no surge arresters is determined can the optimization of surge arresters for eliminating the target reactor structure be carried out, that is, to eliminate the parallel surge arresters on the reactor and reduce costs.

[0066] Please see Figure 5 This embodiment also provides a reactor optimization system for implementing any of the reactor optimization methods described above, comprising: a reactor capacitance acquisition module for acquiring the inter-terminal capacitance, the input / output line connection to ground capacitance, and the output line to ground capacitance of the target reactor; a capacitance ratio acquisition module for acquiring the inter-terminal to ground capacitance ratio based on the inter-terminal capacitance and the output line to ground capacitance, and acquiring the connection capacitance ratio based on the input / output line connection to ground capacitance and the output line to ground capacitance; an inter-terminal voltage peak value acquisition module for acquiring the peak value of an intruding lightning surge, and obtaining the inter-terminal voltage peak value based on the inter-terminal to ground capacitance ratio, the connection capacitance ratio, and the intruding lightning surge peak value; an optimized capacitance ratio acquisition module for generating an optimized inter-terminal to ground capacitance ratio and an optimized connection capacitance ratio based on the inter-terminal voltage peak value within a preset safe range; and a reactor structure optimization module for optimizing the target reactor structure based on the optimized inter-terminal to ground capacitance ratio and the optimized connection capacitance ratio.

[0067] Furthermore, the inter-terminal voltage peak acquisition module specifically includes: acquiring the altitude of the target reactor and the initial peak value of the intruding lightning wave, and generating a high-altitude correction coefficient based on the altitude; correcting the initial peak value of the intruding lightning wave according to the high-altitude correction coefficient to obtain the peak value of the intruding lightning wave; and obtaining the inter-terminal voltage peak value based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning wave.

[0068] Furthermore, the optimized capacitance ratio acquisition module specifically includes: if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under the preset inter-terminal capacitance ratio constraint to generate the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under the preset connection capacitance ratio constraint to generate the optimized connection capacitance ratio.

[0069] Furthermore, the reactor structure optimization module specifically includes: adjusting the inter-terminal capacitance of the target reactor structure according to the optimized inter-terminal-to-ground capacitance ratio; adjusting the installation distance or wiring method between the intermediate node and ground of the target reactor structure according to the optimized connection capacitance ratio; and canceling the surge arrester of the target reactor structure if the peak value of the inter-terminal voltage is confirmed to be within a preset safety range and within a preset range where no surge arrester is required.

[0070] The above embodiments, after obtaining the inter-terminal capacitance, in-line connection-to-ground capacitance, and out-line-to-ground capacitance that determine the charge distribution relationship of the reactor under the action of lightning surge, obtain the corresponding inter-terminal-to-ground capacitance ratio and connection capacitance ratio to quantitatively describe the degree of voltage imbalance. This embodiment further obtains the inter-terminal voltage peak value, which is the maximum value of the lightning impulse voltage actually borne by the reactor terminals, based on the inter-terminal-to-ground capacitance ratio, connection capacitance ratio, and peak value of the lightning surge. Based on this inter-terminal voltage peak value, the optimized inter-terminal-to-ground capacitance ratio and optimized connection capacitance ratio that make the inter-terminal voltage peak value fall within the preset safe range are derived in reverse. Finally, this embodiment optimizes the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and optimized connection capacitance ratio, so that the inter-terminal voltage peak value of the reactor can be precisely limited within the safe range when subjected to lightning surge, thus realizing precise control of the safety margin of the reactor's external insulation.

[0071] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A reactor optimization method, characterized in that, Includes the following steps: Obtain the inter-terminal capacitance, input-output line connection-to-ground capacitance, and output-to-ground capacitance of the target reactor; The inter-terminal capacitance to ground ratio is obtained based on the inter-terminal capacitance and the outgoing line to ground capacitance, and the connection capacitance ratio is obtained based on the incoming and outgoing line connection to ground capacitance and the outgoing line to ground capacitance. The peak value of the intruding lightning wave is obtained, and the peak value of the inter-terminal voltage is obtained based on the inter-terminal capacitance ratio to ground, the connection capacitance ratio, and the peak value of the intruding lightning wave. Within a preset safety range, an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio are generated based on the peak inter-terminal voltage. The target reactor structure is optimized based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio.

2. The reactor optimization method as described in claim 1, characterized in that, The step of obtaining the peak value of the intruding lightning surge and obtaining the peak value of the inter-terminal voltage based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio, and the peak value of the intruding lightning surge includes: The altitude of the target reactor and the initial peak value of the intruding lightning wave are obtained, and a high altitude correction coefficient is generated based on the altitude. The initial peak value of the intruding lightning wave is corrected according to the high altitude correction coefficient to obtain the peak value of the intruding lightning wave; The peak value of the inter-terminal voltage is obtained based on the inter-terminal capacitance ratio to ground, the connection capacitance ratio, and the peak value of the intruding lightning wave.

3. The reactor optimization method as described in claim 2, characterized in that, The step of generating an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio based on the peak inter-terminal voltage within a preset safety range includes: If the peak value of the inter-terminal voltage is confirmed to be within a preset safe range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under the preset inter-terminal capacitance ratio constraint to generate the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under the preset connection capacitance ratio constraint to generate the optimized connection capacitance ratio.

4. A reactor optimization method as described in any one of claims 1 to 3, characterized in that, The optimization of the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio includes: Adjust the inter-terminal capacitance of the target reactor structure according to the optimized inter-terminal-to-ground capacitance ratio; Adjust the spacing between the intermediate nodes of the target reactor structure and the ground, or the wiring method, based on the optimized connection capacitance ratio; If the peak value of the inter-terminal voltage is confirmed to be within the preset safety range and within the preset range where no surge arrester is required, then the surge arrester of the target reactor structure is cancelled.

5. The reactor optimization method as described in claim 3, characterized in that, If the peak value of the inter-terminal voltage is confirmed to be within a preset safe range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under a preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio. The process of increasing the inter-terminal-to-ground capacitance ratio under a preset inter-terminal capacitance ratio constraint to generate an optimized inter-terminal-to-ground capacitance ratio, and decreasing the connection capacitance ratio under a preset connection capacitance ratio constraint to generate an optimized connection capacitance ratio, includes: A coarse adjustment step is performed based on the inter-terminal-to-ground capacitance ratio and the connection capacitance ratio to generate an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio. The coarse adjustment step includes: The inter-terminal capacitance ratio to ground is increased under a preset inter-terminal capacitance ratio constraint to generate an increased inter-terminal capacitance ratio, and the connection capacitance ratio is decreased under a preset connection capacitance ratio constraint to generate a decreased connection capacitance ratio. The peak value of the coarse-adjusted inter-terminal voltage is obtained based on the increased inter-terminal capacitance to ground ratio and the decreased connection capacitance ratio. If it is confirmed that the peak value of the coarse-adjusted inter-terminal voltage is not within the preset safe range, then the increased inter-terminal-to-ground capacitance ratio is taken as the inter-terminal-to-ground capacitance ratio, and the decreased connection capacitance ratio is taken as the connection capacitance ratio, and the coarse-adjustment step is re-executed; otherwise, the coarse-adjustment step is stopped, and the increased inter-terminal-to-ground capacitance ratio is taken as the optimized inter-terminal-to-ground capacitance ratio, and the decreased connection capacitance ratio is taken as the optimized connection capacitance ratio.

6. The reactor optimization method as described in claim 1, characterized in that, The acquisition of the inter-terminal capacitance, input-output line connection-to-ground capacitance, and output-output line-to-ground capacitance of the target reactor includes: Obtain the number of turns, single-turn length, inner and outer diameters of the conductor, ground-mapped area, and ground-height of the target reactor, and establish a series reactor capacitive voltage divider model based on the target reactor; The inter-terminal capacitance is obtained based on the number of turns, the length of a single turn, the inner and outer diameters of the conductor, and the voltage divider model of the series reactor. Based on the ground mapping area, the ground height, and the series reactor capacitor voltage divider model, the input line connection to ground capacitance and the output line connection to ground capacitance are obtained.

7. A reactor optimization system, characterized in that, A reactor optimization method as described in any one of claims 1 to 6 is used to implement the following: The reactor capacitance acquisition module is used to acquire the inter-terminal capacitance, input-output line connection to ground capacitance, and output line to ground capacitance of the target reactor. The capacitance ratio acquisition module is used to acquire the inter-terminal-to-ground capacitance ratio based on the inter-terminal capacitance and the outgoing line-to-ground capacitance, and to acquire the connection capacitance ratio based on the incoming and outgoing line connection-to-ground capacitance and the outgoing line-to-ground capacitance. The inter-terminal voltage peak acquisition module is used to acquire the peak value of the intruding lightning wave and obtain the inter-terminal voltage peak value based on the inter-terminal-to-ground capacitance ratio, the connection capacitance ratio and the peak value of the intruding lightning wave. An optimized capacitance ratio acquisition module is used to generate an optimized inter-terminal-to-ground capacitance ratio and an optimized connection capacitance ratio based on the inter-terminal voltage peak value within a preset safety range. The reactor structure optimization module is used to optimize the target reactor structure based on the optimized inter-terminal-to-ground capacitance ratio and the optimized connection capacitance ratio.

8. The reactor optimization system as described in claim 7, characterized in that, The inter-terminal voltage peak acquisition module specifically includes: The altitude of the target reactor and the initial peak value of the intruding lightning wave are obtained, and a high altitude correction coefficient is generated based on the altitude. The initial peak value of the intruding lightning wave is corrected according to the high altitude correction coefficient to obtain the peak value of the intruding lightning wave; The peak value of the inter-terminal voltage is obtained based on the inter-terminal capacitance ratio to ground, the connection capacitance ratio, and the peak value of the intruding lightning wave.

9. The reactor optimization system as described in claim 8, characterized in that, The optimized capacitance ratio acquisition module specifically includes: If the peak value of the inter-terminal voltage is confirmed to be within a preset safe range, then the inter-terminal-to-ground capacitance is used as the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is used as the optimized connection capacitance ratio; otherwise, the inter-terminal-to-ground capacitance ratio is increased under the preset inter-terminal capacitance ratio constraint to generate the optimized inter-terminal-to-ground capacitance ratio, and the connection capacitance ratio is decreased under the preset connection capacitance ratio constraint to generate the optimized connection capacitance ratio.

10. A reactor optimization system as described in any one of claims 7 to 9, characterized in that, The reactor structure optimization module specifically includes: Adjust the inter-terminal capacitance of the target reactor structure according to the optimized inter-terminal-to-ground capacitance ratio; Adjust the spacing between the intermediate nodes of the target reactor structure and the ground, or the wiring method, based on the optimized connection capacitance ratio; If the peak value of the inter-terminal voltage is confirmed to be within the preset safety range and within the preset range where no surge arrester is required, then the surge arrester of the target reactor structure is cancelled.

Images