Cooperative overvoltage control method for main transformer and circuit breaker of hydropower station

Abstract

The cooperative overvoltage control method comprises the following steps: monitoring load change of a power system in real time, and dynamically adjusting operation parameters of the main transformer and the circuit breaker based on the load change; based on the historical operation data and the real-time electric power parameters, a potential overvoltage condition is predicted through an artificial intelligence algorithm, and preventive adjustment is carried out before overvoltage occurs according to a prediction result; cooperative adjustment of the main transformer and the circuit breaker is realized through electromagnetic coupling feedback control, and the nonlinear impedance matching circuit is switched according to different overvoltage types. And dynamically adjusting the voltage limiting setting of the main transformer and the circuit breaker based on the temperature change. By designing a multi-level cooperative control method, the limitation of a traditional method is solved from the aspects of load regulation, intelligent prediction, feedback control, impedance matching and the like, and the anti-overvoltage capability of the system is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of overvoltage control, and in particular to a method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station. Background Art

[0002] In modern hydropower station power systems, the coordinated operation of the main transformer and the circuit breaker is crucial to the stability and safety of the system. However, due to various reasons such as system load fluctuations, circuit breaker opening and closing operations, and sudden external factors (such as lightning strikes), hydropower stations are prone to overvoltage, resulting in equipment damage and system instability. Most of the existing overvoltage control methods rely on a single overvoltage suppression device, which makes it difficult to dynamically adjust the control strategy according to different overvoltage conditions, resulting in insufficient system anti-interference ability. In addition, existing technologies often lack real-time feedback mechanisms and accurate prediction capabilities, and cannot make effective preventive adjustments before overvoltage occurs, increasing the risk of failure in the power system. Therefore, there is an urgent need for a new control method to achieve coordinated overvoltage control of the main transformer and circuit breaker to improve the adaptability and stability of the hydropower station power system under a variety of complex overvoltage conditions. Summary of the invention

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

[0004] Therefore, the present invention provides a method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station, aiming to solve the insufficiency of overvoltage control in the power system of a hydropower station, specifically including the following technical problems: first, how to automatically adjust the parameters of the main transformer and circuit breaker by real-time monitoring of the dynamic changes of the system load to adapt to the overvoltage risk caused by load fluctuations; second, how to use artificial intelligence algorithms to accurately predict potential overvoltage conditions and take preventive measures before overvoltage occurs; third, how to achieve electromagnetic coupling feedback control between the main transformer and the circuit breaker to optimize the coordination of equipment operation and avoid the occurrence of instantaneous overvoltage; fourth, how to automatically switch the nonlinear impedance matching circuit according to different types of overvoltage characteristics to achieve adaptive control of various overvoltage conditions. The present invention solves the limitations of traditional methods from the aspects of load regulation, intelligent prediction, feedback control and impedance matching by designing a multi-level coordinated control method, and enhances the system's ability to resist overvoltage.

[0005] In order to solve the above technical problems, the present invention provides the following technical solution, a method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station, comprising:

[0006] Monitor power system load changes in real time and dynamically adjust the operating parameters of the main transformer and circuit breaker based on load changes;

[0007] Based on historical operating data and real-time power parameters, artificial intelligence algorithms are used to predict potential overvoltage conditions, and preventive adjustments are made before overvoltage occurs based on the prediction results;

[0008] The coordinated regulation of the main transformer and the circuit breaker is achieved through electromagnetic coupling feedback control, and the nonlinear impedance matching circuit is switched according to different overvoltage types;

[0009] Dynamically adjust the voltage limit settings of the main transformer and circuit breaker based on temperature changes.

[0010] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station described in the present invention, the real-time monitoring of load changes in the power system is achieved through a load sensor, which is installed between the main transformer and the circuit breaker and is used to collect data on generator output power and user-end load in real time.

[0011] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station described in the present invention, the method comprises: dynamically adjusting the operating parameters of the main transformer and the circuit breaker based on load changes includes: real-time monitoring of the load changes of the power system, automatically adjusting the turns ratio of the main transformer according to the changes in load conditions, so that the output voltage matches the current load state, and automatically updating the action setting value of the circuit breaker according to its current cutting capacity to meet the preset operating requirements under load changes; when it is detected that the load fluctuation exceeds the preset threshold, starting the predetermined operation of the current limiting reactor or the shunt load.

[0012] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station described in the present invention, the preventive adjustment includes: when it is predicted that an overvoltage is about to occur, the system adjusts the excitation control parameters of the main transformer, and balances the output voltage of the main transformer by adjusting the excitation current to make it correspond to the current demand of the power grid; the excitation current is adjusted based on the transient response characteristics of the power grid and the excitation curve setting of the transformer, ensuring that the operating parameters of the transformer under overvoltage conditions meet the preset standards;

[0013] The system optimizes the operating time window of the circuit breaker according to the predicted overvoltage amplitude, and avoids the peak of the voltage wave by accurately controlling its opening moment, so as to prevent the circuit breaker from switching at an inappropriate time, causing further grid fluctuations;

[0014] Based on preset load management rules, the system intelligently distributes non-critical loads in the power grid, identifies low-priority loads, and automatically cuts off non-critical loads when the overvoltage prediction value exceeds the set threshold, thereby alleviating instantaneous pressure on the power grid.

[0015] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station described in the present invention, the non-critical loads include auxiliary equipment, backup equipment, non-productive loads, and low-priority power transmission lines.

[0016] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station described in the present invention, the electromagnetic coupling feedback control includes installing an electromagnetic signal feedback device between the main transformer and the circuit breaker for real-time collection of electromagnetic field data of the two, and the feedback device continuously monitors the electromagnetic field changes of the main transformer and the circuit breaker under different loads and operating conditions;

[0017] When the circuit breaker is opening and closing, the feedback device transmits the collected electromagnetic field data to the main transformer, and transmits the instantaneous electromagnetic change signal of the circuit breaker to the control system of the main transformer through the feedback loop; based on the feedback data, the control system of the main transformer adjusts the output voltage according to the preset adjustment rules to coordinate the operating behavior of the circuit breaker and ensure that the output voltage of the main transformer matches the operating status of the circuit breaker during the opening process.

[0018] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station according to the present invention, wherein: the switching of the nonlinear impedance matching circuit according to different overvoltage types includes configuring a nonlinear impedance matching circuit in the system, each matching circuit having different impedance characteristics; a detection circuit is provided in the system for real-time identification and analysis of characteristic parameters of the overvoltage, including voltage amplitude, frequency, and rising rate;

[0019] The detection circuit determines the specific type of the current overvoltage based on the characteristic parameters and transmits the identification result to the switching control device. According to the identified overvoltage type, the switching control device automatically switches to the most matching nonlinear impedance circuit and adjusts the current and voltage characteristics until the specific overvoltage requirements are met.

[0020] As a preferred solution of the method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station described in the present invention, the nonlinear impedance matching circuit is composed of multiple impedance units, and the impedance characteristics of each impedance unit include different resistance, inductance and capacitance parameters; the nonlinear impedance matching circuit is switched to an adapted impedance unit through a control unit when an overvoltage is triggered.

[0021] A computer device comprises 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 method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station are implemented.

[0022] A computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the steps of a method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station are implemented.

[0023] Beneficial effects of the present invention: The method for coordinated overvoltage control of the main transformer and circuit breaker of a hydropower station proposed in the present invention has achieved relatively significant technical effects through a number of innovative measures. First, the dynamic adjustment technology based on load changes enables the main transformer and circuit breaker to adapt to different load states in real time, thereby effectively controlling the risk of overvoltage generation. Secondly, the intelligent prediction module that integrates the artificial intelligence algorithm can identify potential overvoltage conditions in advance and make preventive adjustments, thereby improving the active protection capability of the system. In addition, the electromagnetic coupling feedback control between the main transformer and the circuit breaker realizes the coordinated optimization between the operations of the two, reducing the instantaneous voltage fluctuations when the circuit breaker is switched. Finally, the nonlinear impedance matching circuit of the present invention can adaptively adjust the matching circuit according to the characteristic parameters of the overvoltage to cope with a variety of overvoltage scenarios, thereby enhancing the stability and safety of the system under complex power grid conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic flow chart of a method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station is provided as an embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station, comprising:

[0033] S1: Monitor the load changes of the power system in real time and dynamically adjust the operating parameters of the main transformer and circuit breaker based on the load changes.

[0034] S2: Based on historical operating data and real-time power parameters, artificial intelligence algorithms are used to predict potential overvoltage situations, and preventive adjustments are made before overvoltage occurs based on the prediction results.

[0035] S3: The coordinated regulation of the main transformer and the circuit breaker is achieved through electromagnetic coupling feedback control, and the nonlinear impedance matching circuit is switched according to different overvoltage types.

[0036] S4: Dynamically adjust the voltage limit settings of the main transformer and circuit breaker based on temperature changes.

[0037] The real-time monitoring of the load change of the power system is achieved through a load sensor, which is installed between the main transformer and the circuit breaker and is used to collect data on the generator output power and the user-end load in real time.

[0038] The dynamic adjustment of the operating parameters of the main transformer and the circuit breaker based on load changes includes: real-time monitoring of the load changes of the power system, automatically adjusting the turns ratio of the main transformer according to the changes in load conditions, so that the output voltage matches the current load state, and automatically updating its action setting value according to the current cutting capacity of the circuit breaker to meet the preset operating requirements under load changes; when it is detected that the load fluctuation exceeds the preset threshold, starting the predetermined operation of the current limiting inductor or the shunt load.

[0039] The artificial intelligence algorithm prediction includes: assuming that the system operation data is X={x t ,x t-1 ,…,x t-n}, where x t It represents the real-time parameter data of load, voltage, temperature and frequency at time t, where n is the data length.

[0040] The model input data X needs to be normalized:

[0041]

[0042] Where μ and σ are the mean and standard deviation of the data respectively.

[0043] The normalized data is input into the improved LSTM layer to extract the time dependency in the sequence. Considering the characteristics of overvoltage data, an adaptive memory unit is added. The formula is as follows:

[0044] h t =f ( W h ·X norm +U h ·h t-1 +b h )

[0045] Among them, h t is the hidden state at time t, W h and U h is the weight matrix, b h is the bias vector.

[0046] The feature h extracted by LSTM t Input to the DNN layer for nonlinear mapping and output of overvoltage time and amplitude prediction. Specifically, the output Y of the DNN layer is calculated as follows:

[0047] Y=σ (W o ·h t +b o )

[0048] Among them, W o and b o are the weights and biases of DNN, and σ is the activation function.

[0049] The improved mean square error (MSE) loss function is used to optimize the accuracy of overvoltage amplitude prediction. Considering the weighted average of amplitude prediction error and occurrence time prediction error:

[0050]

[0051] Where α and β are weighting coefficients, and They represent the predicted overvoltage amplitude and occurrence time respectively, while V and T are the actual values.

[0052] Output obtained by prediction in represents the overvoltage amplitude prediction, Indicates the time point when the overvoltage occurs.

[0053] The preventive adjustment includes, when it is predicted that overvoltage is about to occur, the system adjusts the excitation control parameters of the main transformer, and balances the output voltage of the main transformer by adjusting the excitation current to make it correspond to the current demand of the power grid; the adjustment of the excitation current is based on the transient response characteristics of the power grid and the excitation curve setting of the transformer, ensuring that the operating parameters of the transformer under overvoltage conditions meet the preset standards;

[0054] The system optimizes the operating time window of the circuit breaker according to the predicted overvoltage amplitude, and avoids the peak of the voltage wave by accurately controlling its opening moment, so as to prevent the circuit breaker from switching at an inappropriate time, causing further grid fluctuations;

[0055] Based on preset load management rules, the system intelligently distributes non-critical loads in the power grid, identifies low-priority loads, and automatically cuts off non-critical loads when the overvoltage prediction value exceeds the set threshold, thereby alleviating instantaneous pressure on the power grid.

[0056] The non-critical loads include auxiliary equipment, backup equipment, non-productive loads, and low-priority power transmission lines.

[0057] The electromagnetic coupling feedback control includes installing an electromagnetic signal feedback device between the main transformer and the circuit breaker to collect electromagnetic field data of the two in real time, and the feedback device continuously monitors the changes in the electromagnetic fields of the main transformer and the circuit breaker under different loads and operating conditions;

[0058] When the circuit breaker is opening and closing, the feedback device transmits the collected electromagnetic field data to the main transformer, and transmits the instantaneous electromagnetic change signal of the circuit breaker to the control system of the main transformer through the feedback loop; based on the feedback data, the control system of the main transformer adjusts the output voltage according to the preset adjustment rules to coordinate the operating behavior of the circuit breaker and ensure that the output voltage of the main transformer matches the operating status of the circuit breaker during the opening process.

[0059] The switching of the nonlinear impedance matching circuit according to different overvoltage types includes configuring a nonlinear impedance matching circuit in the system, each matching circuit having different impedance characteristics; providing a detection circuit in the system for real-time identification and analysis of characteristic parameters of the overvoltage, including voltage amplitude, frequency, and rising rate;

[0060] The detection circuit determines the specific type of the current overvoltage based on the characteristic parameters and transmits the identification result to the switching control device. According to the identified overvoltage type, the switching control device automatically switches to the most matching nonlinear impedance circuit and adjusts the current and voltage characteristics until the specific overvoltage requirements are met.

[0061] The nonlinear impedance matching circuit is composed of a plurality of impedance units, and the impedance characteristics of each impedance unit include different resistance, inductance and capacitance parameters; the nonlinear impedance matching circuit is switched to an adapted impedance unit through a control unit when an overvoltage is triggered.

[0062] 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 can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

[0063] Example 2

[0064] The second embodiment of the present invention is different from the previous embodiment in that:

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station, characterized in that: include, Monitor power system load changes in real time and dynamically adjust the operating parameters of the main transformer and circuit breaker based on load changes; Based on historical operating data and real-time power parameters, artificial intelligence algorithms are used to predict potential overvoltage conditions, and preventive adjustments are made before overvoltage occurs based on the prediction results; The coordinated regulation of the main transformer and the circuit breaker is achieved through electromagnetic coupling feedback control, and the nonlinear impedance matching circuit is switched according to different overvoltage types; Dynamically adjust the voltage limit settings of the main transformer and circuit breaker based on temperature changes.

2. A method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station as claimed in claim 1, characterized in that: The real-time monitoring of the load change of the power system is achieved through a load sensor, which is installed between the main transformer and the circuit breaker and is used to collect data on the generator output power and the user-end load in real time.

3. A method for coordinated overvoltage control of a main transformer and a circuit breaker in a hydropower station as claimed in claim 2, characterized in that: The dynamic adjustment of the operating parameters of the main transformer and the circuit breaker based on load changes includes: real-time monitoring of the load changes of the power system, automatically adjusting the turns ratio of the main transformer according to the changes in load conditions, so that the output voltage matches the current load state, and automatically updating its action setting value according to the current cutting capacity of the circuit breaker to meet the preset operating requirements under load changes; when it is detected that the load fluctuation exceeds the preset threshold, starting the predetermined operation of the current limiting inductor or the shunt load.

4. A method for controlling overvoltage in coordination between a main transformer and a circuit breaker of a hydropower station as claimed in claim 3, characterized in that: The preventive adjustment includes, when it is predicted that overvoltage is about to occur, the system adjusts the excitation control parameters of the main transformer, and balances the output voltage of the main transformer by adjusting the excitation current to make it correspond to the current demand of the power grid; the adjustment of the excitation current is based on the transient response characteristics of the power grid and the excitation curve setting of the transformer, ensuring that the operating parameters of the transformer under overvoltage conditions meet the preset standards; The system optimizes the operating time window of the circuit breaker according to the predicted overvoltage amplitude, and avoids the peak of the voltage wave by accurately controlling its opening moment, so as to prevent the circuit breaker from switching at an inappropriate time, causing further grid fluctuations; Based on preset load management rules, the system intelligently distributes non-critical loads in the power grid, identifies low-priority loads, and automatically cuts off non-critical loads when the overvoltage prediction value exceeds the set threshold, thereby alleviating instantaneous pressure on the power grid.

5. A method for controlling overvoltage in coordination between a main transformer and a circuit breaker of a hydropower station as claimed in claim 4, characterized in that: The non-critical loads include auxiliary equipment, backup equipment, non-productive loads, and low-priority power transmission lines.

6. A method for controlling overvoltage in coordination between a main transformer and a circuit breaker of a hydropower station as claimed in claim 5, characterized in that: The electromagnetic coupling feedback control includes installing an electromagnetic signal feedback device between the main transformer and the circuit breaker to collect electromagnetic field data of the two in real time, and the feedback device continuously monitors the electromagnetic field changes of the main transformer and the circuit breaker under different loads and operating conditions; When the circuit breaker is opened, the feedback device transmits the collected electromagnetic field data to the main transformer, and transmits the instantaneous electromagnetic change signal of the circuit breaker to the control system of the main transformer through the feedback loop; Based on the feedback data, the control system of the main transformer adjusts the output voltage according to the preset regulation rules to coordinate the operating behavior of the circuit breaker and ensure that the output voltage of the main transformer matches the operating status of the circuit breaker during the breaking process.

7. A method for controlling overvoltage in coordination between a main transformer and a circuit breaker of a hydropower station as claimed in claim 6, characterized in that: The switching of the nonlinear impedance matching circuit according to different overvoltage types includes configuring a nonlinear impedance matching circuit in the system, each matching circuit having different impedance characteristics; providing a detection circuit in the system for real-time identification and analysis of characteristic parameters of the overvoltage, including voltage amplitude, frequency, and rising rate; The detection circuit determines the specific type of the current overvoltage based on the characteristic parameters and transmits the identification result to the switching control device. According to the identified overvoltage type, the switching control device automatically switches to the most matching nonlinear impedance circuit and adjusts the current and voltage characteristics until the specific overvoltage requirements are met.

8. A method for controlling overvoltage in coordination between a main transformer and a circuit breaker of a hydropower station as claimed in claim 7, characterized in that: The nonlinear impedance matching circuit is composed of a plurality of impedance units, and the impedance characteristics of each impedance unit include different resistance, inductance and capacitance parameters; the nonlinear impedance matching circuit is switched to an adapted impedance unit through a control unit when an overvoltage is triggered.

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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