Main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics

Abstract

The invention discloses a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics, and the method comprises the steps: constructing a high-frequency nonlinear winding modeling method for a main transformer winding, and carrying out the dynamic adjustment through a frequency response function; designing a multi-layer iron core magnetic saturation dynamic adjustment module, dividing the iron core into a plurality of magnetization partitions, and modeling magnetic conductivity change; a self-adaptive transient recovery voltage TRV control module is arranged, and the rising rate of the TRV is dynamically adjusted by monitoring transient recovery voltage characteristics of a winding and an iron core under overvoltage; on the basis of TRV control, the dynamic adjusting device based on the coupling capacitor suppresses transient overvoltage in the cable, and the overvoltage protection effect is optimized. Through the high-frequency nonlinear modeling and dynamic adjusting technology, the accurate simulation capability of the main transformer under high-frequency overvoltage is improved, and multi-level protection of equipment such as a winding, an iron core, a cable and a circuit breaker is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of main transformer overvoltage protection, and in particular to a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics. Background Art

[0002] In the power system, due to its complex electromagnetic characteristics, the main transformer is prone to overvoltage fluctuations and reduced insulation strength when subjected to high-frequency overvoltage shocks. In particular, when the circuit breaker disconnects the unloaded transformer or a transient overvoltage occurs, the transient recovery voltage (TRV) rises rapidly, which may cause the arc to reignite and cause equipment damage. Existing technologies mainly suppress overvoltages through simple filtering or resistance-capacitance absorption, but under high-frequency, nonlinear transient conditions, these methods are often limited in effect and difficult to achieve dynamic adaptive adjustment. In addition, nonlinear factors such as the magnetic saturation characteristics of the core, the frequency dependence of the winding, and the transient response characteristics of the cable coupling capacitor are particularly important under high-frequency overvoltages, and existing modeling methods are difficult to fully reflect the dynamic changes of these factors. Summary of the invention

[0003] In view of the above existing problems, the present invention is proposed.

[0004] Therefore, the present invention provides a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics, aiming to solve the problem that the high-frequency nonlinear characteristics of the main transformer cannot be accurately simulated in the prior art, resulting in insufficient overvoltage simulation accuracy and poor protection effect. To this end, the present invention designs a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics, which can comprehensively consider the multi-dimensional response characteristics of transformer windings, cores, cables and circuit breakers under high-frequency overvoltage by introducing dynamically adjusted high-frequency nonlinear winding modeling, multi-level core magnetic saturation adjustment, adaptive TRV control module and transient overvoltage suppression means based on coupling capacitors, thereby solving the problem of inaccurate equipment response and lagging protection mechanism caused by overvoltage fluctuations.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions, which are main transformer overvoltage simulation and protection methods based on high-frequency nonlinear characteristics, including:

[0006] Construct a high-frequency nonlinear winding modeling method for the main transformer winding, and dynamically adjust the winding inductance, capacitance and resistance parameters through the frequency response function;

[0007] Design a multi-level core magnetic saturation dynamic adjustment module, divide the core into multiple magnetization partitions, and model the permeability changes of each partition under different high-frequency voltage conditions;

[0008] According to the core model, an adaptive transient recovery voltage TRV control module is set up to dynamically adjust the rising rate of TRV by monitoring the transient recovery voltage characteristics of the winding and the core under overvoltage;

[0009] On the basis of TRV control, the dynamic adjustment device based on coupling capacitor suppresses transient overvoltage in the cable, adjusts the coupling capacitance value of the cable in real time, and works together with the TRV control module to optimize the overvoltage protection effect.

[0010] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, wherein: the high-frequency nonlinear winding modeling includes dynamically adjusting the winding parameters based on the frequency response of the voltage waveform to achieve the winding having adaptive inductance, capacitance and resistance characteristics under high-frequency conditions;

[0011] By measuring the inductance, capacitance and resistance parameters of the winding under the preset frequency conditions, the frequency response data of the winding is obtained. The data comes from the actual test of the winding or is calculated by electromagnetic simulation software to form a complete high-frequency nonlinear frequency response curve; based on the response curve, a dynamic adjustment function of the winding parameters is constructed, and the inductance, capacitance and resistance parameters are associated with the frequency. A multi-dimensional nonlinear interpolation method is used to make the winding parameters transition smoothly when the frequency changes. At the same time, an adaptive algorithm is introduced to monitor the voltage waveform frequency under overvoltage conditions, and the inductance, capacitance and resistance characteristics of the winding are adjusted in real time according to the feedback loop;

[0012] In the inductance adjustment mechanism, the winding inductance value is set as a nonlinear function of frequency to reflect the influence of skin effect on current distribution. A high-frequency capacitance adjustment module is added to the winding model to simulate the capacitance characteristics under high-frequency overvoltage by adjusting the effective capacitance value of the winding.

[0013] Based on the frequency response, a dynamic adjustment mechanism of equivalent resistance is set in the model to increase the equivalent resistance value under high frequency conditions to reflect the loss corresponding to the frequency;

[0014] The feedback control loop is used to dynamically adjust the frequency response function in real time, and automatically calculate and adjust parameters according to the frequency component of the voltage waveform to keep the inductance, capacitance and resistance parameters of the winding consistent with the current frequency.

[0015] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, the multi-level core magnetic saturation dynamic adjustment module includes dividing the core into multiple magnetization partitions based on high-frequency magnetization characteristics, and each partition corresponds to a different magnetization curve and saturation point.

[0016] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, wherein: the multi-level core magnetic saturation dynamic adjustment module includes dividing the core from the outer layer to the inner layer into multiple regions by analyzing the magnetic saturation characteristics of the core at high frequency, and the magnetization characteristic parameters of each region are dynamically set according to its relative position and saturation characteristics;

[0017] The permeability of each magnetization partition is adjusted nonlinearly with the applied frequency and voltage to simulate the dynamic permeability under high-frequency overvoltage conditions.

[0018] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, the TRV control module includes dynamically adjusting the rising rate of TRV by real-time monitoring the changes of the transient recovery voltage TRV during the circuit breaker opening process and using the performance curve of the circuit breaker as a reference.

[0019] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, the TRV control module has a built-in voltage monitor to continuously collect and analyze the real-time waveform of TRV, and combined with the insulation recovery characteristics of the circuit breaker, automatically judges whether TRV is likely to exceed the critical tolerance value of the circuit breaker; when it is monitored that the rising rate of TRV may cause the risk of arc reignition, the module immediately adjusts the voltage rising rate, delays or suppresses the TRV from rising to the critical value, thereby controlling the risk of arc reignition within a safe range.

[0020] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, the TRV control module includes a voltage control unit with dynamic feedback, which is linked with the overvoltage monitoring system to adjust the breaking rate of the circuit breaker according to transient overvoltage fluctuations.

[0021] As a preferred solution of the main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics described in the present invention, wherein: the transient overvoltage suppression method based on coupling capacitors realizes the regulation of the transient overvoltage of the cable by setting a dynamic coupling capacitor adjustment device at the cable connection port;

[0022] The dynamic coupling capacitor adjustment device has a built-in frequency monitoring and voltage acquisition module, which can obtain the frequency characteristics and voltage amplitude information of overvoltage in real time and adjust the size of the coupling capacitor according to the data;

[0023] By controlling the capacitance adjustment unit, the device automatically increases or decreases the coupling capacitance when a high-frequency overvoltage occurs.

[0024] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, steps of a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics are implemented.

[0025] A computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the steps of a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics are implemented.

[0026] Beneficial effects of the present invention: The present invention improves the ability to accurately simulate the main transformer under high-frequency overvoltage through high-frequency nonlinear modeling and dynamic adjustment technology, and realizes multi-level protection of equipment such as windings, cores, cables and circuit breakers. The method can respond quickly when transient overvoltage occurs, ensure the adaptive adjustment of electrical parameters of each component at different frequencies, and avoid equipment failures caused by overvoltage fluctuations. In addition, the present invention provides a dynamic control module based on actual electrical characteristics, which is flexible and widely applicable, can improve the safety and reliability of the power system, extend the service life of equipment, and has significant application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 work.

[0028] Figure 1 A schematic flow chart of a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics, including:

[0036] S1: Construct a high-frequency nonlinear winding modeling method for the main transformer winding, and dynamically adjust the inductance, capacitance, and resistance parameters of the winding through the frequency response function.

[0037] S2: Design a multi-level core magnetic saturation dynamic adjustment module, divide the core into multiple magnetization partitions, and model the permeability changes of each partition under different high-frequency voltage conditions.

[0038] S3: According to the core model, an adaptive transient recovery voltage TRV control module is set to dynamically adjust the rising rate of TRV by monitoring the transient recovery voltage characteristics of the winding and the core under overvoltage.

[0039] S4: On the basis of TRV control, the dynamic adjustment device based on coupling capacitor suppresses the transient overvoltage in the cable, adjusts the coupling capacitance value of the cable in real time, and works in conjunction with the TRV control module to optimize the overvoltage protection effect.

[0040] The high-frequency nonlinear winding modeling includes dynamically adjusting winding parameters based on the frequency response of the voltage waveform to achieve adaptive inductance, capacitance and resistance characteristics of the winding under high-frequency conditions;

[0041] By measuring the inductance, capacitance and resistance parameters of the winding under the preset frequency conditions, the frequency response data of the winding is obtained. The data comes from the actual test of the winding or is calculated by electromagnetic simulation software to form a complete high-frequency nonlinear frequency response curve; based on the response curve, a dynamic adjustment function of the winding parameters is constructed, and the inductance, capacitance and resistance parameters are associated with the frequency. A multi-dimensional nonlinear interpolation method is used to make the winding parameters transition smoothly when the frequency changes. At the same time, an adaptive algorithm is introduced to monitor the voltage waveform frequency under overvoltage conditions, and the inductance, capacitance and resistance characteristics of the winding are adjusted in real time according to the feedback loop;

[0042] In the inductance adjustment mechanism, the winding inductance value is set as a nonlinear function of frequency to reflect the influence of skin effect on current distribution. A high-frequency capacitance adjustment module is added to the winding model to simulate the capacitance characteristics under high-frequency overvoltage by adjusting the effective capacitance value of the winding.

[0043] Based on the frequency response, a dynamic adjustment mechanism of equivalent resistance is set in the model to increase the equivalent resistance value under high frequency conditions to reflect the loss corresponding to the frequency;

[0044] The feedback control loop is used to dynamically adjust the frequency response function in real time, and automatically calculate and adjust parameters according to the frequency component of the voltage waveform to keep the inductance, capacitance and resistance parameters of the winding consistent with the current frequency.

[0045] The frequency response function includes assuming that the equivalent inductance L(f), equivalent capacitance C(f), and equivalent resistance R(f) of the winding are all functions of the frequency f. Its dynamic characteristics are described by the following frequency modulation function:

[0046] Considering the influence of skin effect and proximity effect, the equivalent inductance of the winding will decrease as the frequency increases. Assuming the initial inductance value is L0, the frequency modulation of inductance adopts a nonlinear exponential decay model:

[0047]

[0048] Among them, α and β are frequency-dependent modulation coefficients, and their specific values ​​are determined according to the physical characteristics of the winding and experimental data.

[0049] The winding has a significant parasitic capacitance effect at high frequencies, and its equivalent capacitance will increase with increasing frequency. Assuming the initial equivalent capacitance of the winding is C0, the frequency modulation of the capacitance adopts a polynomial growth model:

[0050] C(f)=C0+γf n

[0051] Among them, γ and n are modulation coefficients determined according to the parasitic capacitance characteristics of the winding, reflecting the nonlinear increase of capacitance with frequency; C(f) is the equivalent capacitance function.

[0052] Under high frequency conditions, the skin effect causes the resistance to increase with increasing frequency. Assuming the initial equivalent resistance is R0, the resistance modulation adopts a linear growth model:

[0053] R(f)=R0(1+δf)

[0054] Among them, δ is the modulation coefficient of the frequency response, which represents the positive correlation between resistance and frequency; R(f) is the equivalent resistance function.

[0055] In order to describe the dynamic characteristics of the winding at different frequencies, the frequency-dependent impedance Z(f) of the winding is defined as:

[0056]

[0057] A dynamic impedance model is constructed by frequency-dependent parameters L(f), C(f), and R(f) to reflect the impedance characteristics of the winding under high-frequency nonlinear overvoltage.

[0058] The multi-level core magnetic saturation dynamic adjustment module includes dividing the core into a plurality of magnetization partitions based on high-frequency magnetization characteristics, each partition corresponding to a different magnetization curve and saturation point.

[0059] The multi-level core magnetic saturation dynamic adjustment module includes dividing the core from the outer layer to the inner layer into multiple regions by analyzing the magnetic saturation characteristics of the core at high frequency, and dynamically setting the magnetization characteristic parameters of each region according to its relative position and saturation characteristics;

[0060] The permeability of each magnetization partition is adjusted nonlinearly with the applied frequency and voltage to simulate the dynamic permeability under high-frequency overvoltage conditions.

[0061] The TRV control module includes monitoring the change of transient recovery voltage TRV in the process of circuit breaker opening in real time and dynamically adjusting the rising rate of TRV by using the performance curve of the circuit breaker as a reference.

[0062] The TRV control module has a built-in voltage monitor to continuously collect and analyze the real-time waveform of TRV, and automatically determines whether TRV is likely to exceed the critical tolerance value of the circuit breaker in combination with the insulation recovery characteristics of the circuit breaker. When it is monitored that the rising rate of TRV may cause the risk of arc reignition, the module immediately adjusts the voltage rising rate, delays or suppresses the rise of TRV to the critical value, thereby controlling the risk of arc reignition within a safe range.

[0063] The TRV control module includes a voltage control unit with dynamic feedback, which is linked with the overvoltage monitoring system to adjust the breaking rate of the circuit breaker according to transient overvoltage fluctuations.

[0064] The transient overvoltage suppression method based on coupling capacitors achieves regulation of the transient overvoltage of the cable by setting a dynamic coupling capacitor adjustment device at the cable connection port;

[0065] The dynamic coupling capacitor adjustment device has a built-in frequency monitoring and voltage acquisition module, which can obtain the frequency characteristics and voltage amplitude information of overvoltage in real time and adjust the size of the coupling capacitor according to the data;

[0066] By controlling the capacitance adjustment unit, the device automatically increases or decreases the coupling capacitance when a high-frequency overvoltage occurs.

[0067] 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.

[0068] Example 2

[0069] The second embodiment of the present invention is different from the previous embodiment in that:

[0070] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0071] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0072] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0074] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0075] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics, characterized in that: include, Construct a high-frequency nonlinear winding modeling method for the main transformer winding, and dynamically adjust the winding inductance, capacitance, and resistance parameters through the frequency response function; Design a multi-level core magnetic saturation dynamic adjustment module, divide the core into multiple magnetization partitions, and model the permeability changes of each partition under different high-frequency voltage conditions; According to the core model, an adaptive transient recovery voltage TRV control module is set up to dynamically adjust the rising rate of TRV by monitoring the transient recovery voltage characteristics of the winding and the core under overvoltage; On the basis of TRV control, the dynamic adjustment device based on coupling capacitor suppresses transient overvoltage in the cable, adjusts the coupling capacitance value of the cable in real time, and works together with the TRV control module to optimize the overvoltage protection effect.

2. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 1 is characterized in that: The high-frequency nonlinear winding modeling includes dynamically adjusting winding parameters based on the frequency response of the voltage waveform to achieve adaptive inductance, capacitance and resistance characteristics of the winding under high-frequency conditions; By measuring the inductance, capacitance and resistance parameters of the winding under the preset frequency conditions, the frequency response data of the winding is obtained. The data comes from the actual test of the winding or is calculated by electromagnetic simulation software to form a complete high-frequency nonlinear frequency response curve; Based on the response curve, a dynamic adjustment function of the winding parameters is constructed, and the inductance, capacitance and resistance parameters are associated with the frequency. A multi-dimensional nonlinear interpolation method is used to make the winding parameters transition smoothly when the frequency changes. At the same time, an adaptive algorithm is introduced to monitor the voltage waveform frequency under overvoltage conditions, and the inductance, capacitance and resistance characteristics of the winding are adjusted in real time according to the feedback loop; In the inductance adjustment mechanism, the winding inductance value is set as a nonlinear function of frequency to reflect the influence of skin effect on current distribution. A high-frequency capacitance adjustment module is added to the winding model to simulate the capacitance characteristics under high-frequency overvoltage by adjusting the effective capacitance value of the winding. Based on the frequency response, a dynamic adjustment mechanism of equivalent resistance is set in the model to increase the equivalent resistance value under high frequency conditions to reflect the loss corresponding to the frequency; The feedback control loop is used to dynamically adjust the frequency response function in real time, and automatically calculate and adjust parameters according to the frequency component of the voltage waveform to keep the inductance, capacitance and resistance parameters of the winding consistent with the current frequency.

3. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 2 is characterized in that: The multi-level core magnetic saturation dynamic adjustment module includes dividing the core into a plurality of magnetization partitions based on high-frequency magnetization characteristics, each partition corresponding to a different magnetization curve and saturation point.

4. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 3 is characterized in that: The multi-level core magnetic saturation dynamic adjustment module includes dividing the core from the outer layer to the inner layer into multiple regions by analyzing the magnetic saturation characteristics of the core at high frequency, and dynamically setting the magnetization characteristic parameters of each region according to its relative position and saturation characteristics; The permeability of each magnetization partition is adjusted nonlinearly with the applied frequency and voltage to simulate the dynamic permeability under high-frequency overvoltage conditions.

5. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 4 is characterized in that: The TRV control module includes monitoring the change of transient recovery voltage TRV in the process of circuit breaker opening in real time and dynamically adjusting the rising rate of TRV by using the performance curve of the circuit breaker as a reference.

6. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 5 is characterized in that: The TRV control module has a built-in voltage monitor to continuously collect and analyze the real-time waveform of TRV, and automatically determines whether TRV is likely to exceed the critical tolerance value of the circuit breaker in combination with the insulation recovery characteristics of the circuit breaker. When it is monitored that the rising rate of TRV may cause the risk of arc reignition, the module immediately adjusts the voltage rising rate, delays or suppresses the rise of TRV to the critical value, thereby controlling the risk of arc reignition within a safe range.

7. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 6 is characterized in that: The TRV control module includes a voltage control unit with dynamic feedback, which is linked with the overvoltage monitoring system to adjust the breaking rate of the circuit breaker according to transient overvoltage fluctuations.

8. The main transformer overvoltage simulation and protection method based on high-frequency nonlinear characteristics according to claim 7 is characterized in that: The transient overvoltage suppression method based on coupling capacitors achieves regulation of the transient overvoltage of the cable by setting a dynamic coupling capacitor adjustment device at the cable connection port; The dynamic coupling capacitor adjustment device has a built-in frequency monitoring and voltage acquisition module, which can obtain the frequency characteristics and voltage amplitude information of overvoltage in real time and adjust the size of the coupling capacitor according to the data; By controlling the capacitance adjustment unit, the device automatically increases or decreases the coupling capacitance when a high-frequency overvoltage occurs.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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