10kV power system overvoltage protection and optimization method based on EMTP simulation technology

Abstract

The invention discloses a 10kV power system overvoltage protection and optimization method based on an EMTP simulation technology, and the method comprises the steps: constructing a multi-layer simulation model, and carrying out the simulation analysis; modeling and predicting the overvoltage trend of the power system by collecting simulation data and utilizing a machine learning algorithm; in the simulation process, cable modeling parameters including resistance, capacitance and inductance are dynamically updated in real time, and the actual operation state of the cable is simulated; based on a high-frequency transient electromagnetic interference signal detected in real time, an interference elimination scheme is automatically generated and adjusted; performing parallel operation on the simulation scene by adopting quantum calculation, and synchronously performing overvoltage protection optimization; and summarizing and optimizing the simulation data to generate an improved protection scheme. According to the invention, the anti-interference capability and the operation reliability of the power system are obviously improved, the safe operation of the system in various complex operation scenes is ensured, the service life of power equipment is effectively prolonged, and the operation fault risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of overvoltage protection of power systems, and in particular to an overvoltage protection and optimization method for a 10kV power system based on EMTP simulation technology. Background Art

[0002] With the continuous expansion of the scale of power systems, especially the increasing popularity of high-voltage transmission and large-scale power generation units connected to the grid, the overvoltage problem in power systems has become increasingly prominent. Overvoltage phenomena are usually caused by lightning strikes, circuit breaker disconnection, load surges or switching, fault clearing and other operations. The resulting high-frequency transient voltage fluctuations may cause serious damage to the equipment in the system, resulting in unstable operation of the power system and even causing systemic failures. Traditional overvoltage protection methods rely on static equipment parameter adjustments and are difficult to quickly respond to the rapidly changing overvoltage conditions in complex power systems. In addition, with the increasing complexity of the power system structure, a single simulation technology is difficult to quickly process massive data in multiple scenarios, resulting in insufficient response speed of overvoltage protection and poor protection effect.

[0003] Electromagnetic transient simulation technology (EMTP) is a widely used power system simulation method that can simulate and analyze overvoltage phenomena in power systems. However, most existing simulation technologies rely on classical calculation methods, with low simulation efficiency, and it is difficult to meet the real-time protection needs of different scenarios in power systems. Therefore, how to improve the simulation speed and enhance the response capability of protection equipment has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a 10kV power system overvoltage protection and optimization method based on EMTP simulation technology, which mainly solves the problems of insufficient overvoltage protection response, low simulation efficiency and poor adaptability of protection schemes in power systems. Overvoltage phenomena in power systems are usually caused by lightning strikes, circuit breaker disconnection, load surge or switching, fault clearing and other operations. These emergencies lead to high-frequency transient overvoltages, which may cause serious damage to system equipment. Existing protection means often rely on static equipment configuration, and cannot quickly adjust protection parameters according to real-time changes in the power system, resulting in insufficient response to overvoltage. At the same time, traditional simulation methods rely on classical computing methods, which are less efficient when facing complex calculations in multiple scenarios, and cannot generate protection schemes in time. In addition, due to the complexity and variability of overvoltage phenomena, a single protection strategy is difficult to adapt to the needs of different scenarios, resulting in poor protection effects. The present invention can process overvoltage responses in real time and automatically adjust the parameters of protection equipment by introducing quantum computing technology, machine learning algorithms and multi-scenario parallel simulation, thereby realizing adaptive protection of the system and effectively improving the protection response speed and accuracy of the power system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions, which are 10kV power system overvoltage protection and optimization methods based on EMTP simulation technology, including:

[0007] Construct a multi-level simulation model to simulate and analyze low-frequency, medium-frequency and high-frequency overvoltages respectively;

[0008] By collecting simulation data, machine learning algorithms are used to model and predict the overvoltage trend of the power system;

[0009] During the simulation process, the cable modeling parameters, including resistance, capacitance and inductance, are dynamically updated in real time to simulate the actual operation status of the cable;

[0010] Automatically generate and adjust interference elimination schemes based on high-frequency transient electromagnetic interference signals detected in real time;

[0011] Use quantum computing to parallelize simulation scenarios and optimize overvoltage protection simultaneously;

[0012] Summarize and optimize the simulation data to generate improved protection solutions.

[0013] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, wherein: the multi-level simulation model includes a comprehensive simulation analysis of the steady-state voltage, transient voltage and high-frequency overvoltage caused by lightning in the 10kV power system, and simulates the response of the power system in different operation scenarios respectively;

[0014] The simulation objects include steady-state voltage in the low-frequency band, transient voltage in the medium-frequency band and transient overvoltage in the high-frequency band, which are used to simulate the normal operation of the system, load changes, circuit breaker opening and voltage fluctuations under lightning strikes.

[0015] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, wherein: the multi-level simulation model includes processing the voltage fluctuations of each frequency band during the simulation process through spectrum analysis to reveal the frequency components in the voltage fluctuations, especially the key frequency characteristics in overvoltages in different frequency bands;

[0016] Based on the results of spectrum analysis, the protection design of the power system is optimized for low-frequency steady-state, medium-frequency transient and high-frequency transient phenomena, including adjusting the voltage regulation equipment, optimizing the arcing characteristics of the circuit breaker and configuring the response parameters of the lightning arrester. By comprehensively analyzing the simulation results of each frequency band, the overvoltage response characteristics of the whole system are formed, which provides a basis for the protection equipment in the power system and implements corresponding protection measures.

[0017] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, the simulation analysis includes: if the power system is in normal operation, simulating the fluctuation of steady-state voltage; when the load is running smoothly, evaluating the long-term stability and trend change of the system voltage;

[0018] If the power system encounters a sudden increase in load, the voltage fluctuation when the load is suddenly connected or removed is simulated; when the load changes drastically, the transient voltage response of the system in a short time is evaluated, and the voltage rise or fall is monitored;

[0019] If the circuit breaker is opened, the arc behavior during the circuit breaker opening process is simulated; when the circuit breaker is opened, the possible overvoltage is simulated, and the impact of the arc duration on the transient voltage is evaluated.

[0020] If the load switches, the voltage fluctuation when the load switches from one line to another is simulated; when the load switches, the fluctuation caused by voltage discontinuity is evaluated, and the voltage recovery process after switching is analyzed.

[0021] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, the parallel operation of the simulation scenario includes: if the power system encounters a lightning strike, simulating the transient high-frequency overvoltage caused by the lightning strike; when the lightning strike occurs, evaluating the response process of the lightning arrester, and analyzing the voltage recovery after the lightning strike and its impact on the system;

[0022] If the power system short-circuit fault is cleared, the voltage fluctuation when the system returns to normal from the abnormal state is simulated; when the fault is cleared, the transient response during the voltage recovery process and the transient overvoltage after the fault is cleared are evaluated;

[0023] If equipment maintenance is being performed, the voltage fluctuations when the equipment is disconnected from the grid or reconnected are simulated; when equipment maintenance is being performed, the voltage instability caused by disconnection or reconnection is evaluated, and the voltage fluctuations during equipment maintenance are analyzed;

[0024] If the generator sets are connected to the grid on a large scale, the transient overvoltage generated when the generator sets are connected to the grid is simulated; when the generator sets are connected to the grid, the transient voltage fluctuations of the system are evaluated, and the voltage recovery process and system stability after grid connection are analyzed.

[0025] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, wherein: the parallel operation of the simulation scenario includes, if the system is in normal operation, the voltage, current and load changes in the system are processed by quantum computing in parallel to evaluate the stability of the system voltage; when the voltage fluctuation is close to an abnormal value, the system can automatically adjust the parameters of the voltage regulation equipment to ensure smooth operation;

[0026] If the load increases suddenly, quantum computing can process the sudden changes in voltage and current in parallel and evaluate the transient voltage response of the system; when the transient overvoltage caused by the sudden increase in load exceeds the predetermined threshold, the system will automatically generate and adjust the resistance and capacitance parameters of the RC absorber to prevent the voltage fluctuation from expanding.

[0027] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, wherein: the parallel operation of the simulation scene includes: if the circuit breaker performs an opening operation, the quantum computing parallelly processes the transient high-frequency interference caused by the arc, and calculates the arc duration and its impact on the system; when the opening causes a high-frequency overvoltage, the system will automatically optimize the parameters of the resistor-capacitor absorber and the electromagnetic shielding to reduce the impact of the transient overvoltage;

[0028] If the load switches, quantum computing will process the voltage fluctuations during load switching in parallel and evaluate the voltage recovery process after switching. When load switching causes transient voltage instability, the system will dynamically adjust the configuration of the voltage regulation device and the resistor-capacitor absorber to ensure that the voltage quickly returns to normal.

[0029] As a preferred solution of the 10kV power system overvoltage protection and optimization method based on EMTP simulation technology described in the present invention, wherein: the parallel operation of the simulation scenario includes that if the system encounters a lightning strike, the quantum computing can process the transient high-frequency overvoltage caused by the lightning strike in parallel and quickly evaluate the response of the lightning arrester; when the lightning strike signal is detected, the system automatically adjusts the discharge voltage parameters of the lightning arrester and optimizes the configuration of the resistor-capacitor absorber to suppress the overvoltage;

[0030] If the fault in the power system is cleared, quantum computing processes the fluctuations in voltage recovery in parallel and evaluates the transient response after the fault is cleared. When the fault clearing causes transient voltage fluctuations, the system optimizes the parameters of the RC absorber in real time to ensure that no additional overvoltage is generated during voltage recovery.

[0031] If the system is performing equipment maintenance, quantum computing will parallelly process voltage fluctuations during equipment disconnection or reconnection. When the voltage is unstable during maintenance, the system will dynamically adjust the parameters of the protection equipment to ensure that transient overvoltage is not caused when the equipment is connected or disconnected from the network.

[0032] If the generator sets are connected to the grid on a large scale, quantum computing will process the transient voltage fluctuations caused by the grid connection in parallel and simultaneously evaluate the voltage changes in other scenarios. When the generator sets are connected to the grid, the system will automatically adjust the configuration of the voltage regulation equipment and the resistor-capacitor absorber to ensure the overall stability of the system during the grid connection process.

[0033] 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 10kV power system overvoltage protection and optimization method based on EMTP simulation technology are implemented.

[0034] A computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the computer program implements the steps of a 10kV power system overvoltage protection and optimization method based on EMTP simulation technology.

[0035] Beneficial effects of the present invention: The present invention realizes rapid simulation and overvoltage protection optimization in multiple scenarios in the power system by combining quantum computing, machine learning and real-time protection optimization technology. The parallel computing capability of quantum computing enables the system to handle multiple complex simulation scenarios (such as normal operation, sudden load increase, lightning strike, etc.) at the same time, greatly improving the simulation speed and processing efficiency. Combined with the machine learning algorithm, the system can model and predict the voltage fluctuation trend, automatically generate and adjust the configuration of the protection equipment in real time, and ensure that the system can respond quickly and perform dynamic protection under complex operating conditions. The present invention is also specifically aimed at overvoltages caused by high-frequency transient electromagnetic interference, by automatically generating interference suppression schemes, adjusting the parameters of resistors and capacitors and electromagnetic shielding equipment, and ensuring the stability of the system under high-frequency interference. In general, the present invention significantly improves the anti-interference ability and operational reliability of the power system, ensures the safe operation of the system in various complex operating scenarios, effectively improves the service life of power equipment and reduces the risk of operational failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 A schematic flow chart of a 10kV power system overvoltage protection and optimization method based on EMTP simulation technology provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a 10kV power system overvoltage protection and optimization method based on EMTP simulation technology, including:

[0045] S1: Construct a multi-level simulation model to simulate and analyze low-frequency, medium-frequency and high-frequency overvoltages respectively.

[0046] S2: By collecting simulation data, the overvoltage trend of the power system is modeled and predicted using machine learning algorithms. During the simulation process, the cable modeling parameters, including resistance, capacitance, and inductance, are dynamically updated in real time to simulate the actual operating status of the cable.

[0047] S3: Based on the high-frequency transient electromagnetic interference signal detected in real time, the interference elimination scheme is automatically generated and adjusted.

[0048] S4: Use quantum computing to perform parallel operations on simulation scenarios and simultaneously optimize overvoltage protection.

[0049] S5: Summarize and optimize the simulation data to generate an improved protection plan.

[0050] The multi-level simulation model includes a comprehensive simulation analysis of steady-state voltage, transient voltage and high-frequency overvoltage caused by lightning strikes occurring in a 10kV power system, and simulates the response of the power system under different operation scenarios;

[0051] The simulation objects include steady-state voltage in the low-frequency band, transient voltage in the medium-frequency band and transient overvoltage in the high-frequency band, which are used to simulate the normal operation of the system, load changes, circuit breaker opening and voltage fluctuations under lightning strikes.

[0052] The multi-level simulation model includes processing the voltage fluctuations in each frequency band during the simulation process through spectrum analysis to reveal the frequency components in the voltage fluctuations, especially the key frequency characteristics in the overvoltages in different frequency bands;

[0053] Based on the results of spectrum analysis, the protection design of the power system is optimized for low-frequency steady-state, medium-frequency transient and high-frequency transient phenomena, including adjusting the voltage regulation equipment, optimizing the arcing characteristics of the circuit breaker and configuring the response parameters of the lightning arrester. By comprehensively analyzing the simulation results of each frequency band, the overvoltage response characteristics of the whole system are formed, which provides a basis for the protection equipment in the power system and implements corresponding protection measures.

[0054] The simulation analysis includes simulating the fluctuation of steady-state voltage if the power system is in normal operation; evaluating the long-term stability and trend change of system voltage when the load is running smoothly;

[0055] If the power system encounters a sudden increase in load, the voltage fluctuation when the load is suddenly connected or removed is simulated; when the load changes drastically, the transient voltage response of the system in a short time is evaluated, and the voltage rise or fall is monitored;

[0056] If the circuit breaker is opened, the arc behavior during the circuit breaker opening process is simulated; when the circuit breaker is opened, the possible overvoltage is simulated, and the impact of the arc duration on the transient voltage is evaluated.

[0057] If the load switches, the voltage fluctuation when the load switches from one line to another is simulated; when the load switches, the fluctuation caused by voltage discontinuity is evaluated, and the voltage recovery process after switching is analyzed.

[0058] By collecting simulation data, the overvoltage trend of the power system is modeled and predicted using machine learning algorithms, including:

[0059] The operation data of the power system is collected from the EMTP simulation system, including voltage V(t), current I(t), load L(t), frequency f(t) and their time-varying characteristic values. The simulation data is normalized to make the dimensions of each data the same. The LSTM long short-term memory network of the machine learning algorithm is used to model the overvoltage trend of the power system.

[0060] The LSTM model is trained using the collected simulation data, and the model parameters W and b are adjusted through back propagation and gradient descent to minimize the loss function.

[0061] The loss function can be the mean square error (MSE):

[0062]

[0063] Where: N is the number of data points; V pred (t i ) is the voltage value predicted by the model; V true (t i ) is the voltage value in the actual simulation.

[0064] The trained LSTM model is used to predict the voltage trend V in the future time period pred (t), based on the input time series data, the model will output the future voltage changes.

[0065] Prediction formula:

[0066] V pred (t+1)=LSTM(F t )

[0067] Where: V pred (t+1) is the predicted voltage value at the next moment; F t is the input feature data at the current moment.

[0068] By transforming the prediction result V pred (t) and the actual simulation data V true (t) Compare and verify the accuracy of the model.

[0069] The generalization ability of the model was further verified through cross-validation and test data sets.

[0070] During the simulation process, the purpose of real-time dynamic updating of cable modeling parameters is to dynamically adjust the electrical parameters (resistance, capacitance and inductance) of the cable through the real-time physical state of the cable (such as temperature, load change, aging degree, etc.), so that the simulation model can be closer to the actual operation of the cable performance. The following is the specific content of the process and the corresponding mathematical model.

[0071] The resistance R(t) of the cable is affected by the temperature T(t) and the current load I(t). When the temperature rises or the cable ages, the resistance of the cable increases, so the resistance value of the cable must be updated in real time.

[0072] The dynamic formula for cable resistance is:

[0073] R(t)=R 0 [1+α(T(t)-T 0 )]

[0074] Where: R(t) is the real-time cable resistance; R 0 is the reference temperature T 0 is the cable resistance at the time of the test; α is the temperature coefficient of the cable material; T(t) is the real-time temperature of the cable.

[0075] Cable temperature T(t) and current I(t) and ambient temperature T env (t) is related, and based on the Joule heating effect, the cable temperature is dynamically updated by the following formula:

[0076]

[0077] Where: T env (t) is the ambient temperature of the cable; I(t) is the current flowing in the cable; C th is the thermal capacity of the cable.

[0078] The capacitance C(t) of the cable is affected by the aging of the cable insulation medium and the material properties. As time goes by and environmental conditions change (such as humidity, insulation medium degradation, etc.), the capacitance value of the cable will change. Therefore, the dynamic formula for cable capacitance is:

[0079]

[0080] Where: C(t) is the real-time cable capacitance; ∈ r (t) is the relative dielectric constant of the dielectric material, which may change with time and environmental factors; 0 is the dielectric constant of vacuum; A is the effective area between the conductors; and d is the distance between the conductors.

[0081] The insulation aging of the cable will lead to the dielectric constant ∈ r The change of (t) usually decreases exponentially with time, and the aging model can be expressed as:

[0082]

[0083] in: is the dielectric constant at the initial moment; λ is the aging constant, which determines the aging rate of the insulating medium; t is time.

[0084] The inductance L(t) of the cable is affected by the cable geometry and the material magnetic permeability μ(t). The cable inductance changes with the magnetic field of the current and the installation method of the cable (such as the spacing and arrangement of the cables). Therefore, the dynamic formula of the cable inductance is:

[0085] Where: L(t) is the real-time cable inductance; μ(t) is the relative magnetic permeability of the cable material, which may change with cable aging and magnetization; μ 0 is the magnetic permeability of vacuum; l is the length of the cable; A is the effective cross-sectional area of ​​the cable.

[0086] The magnetic permeability μ(t) of the cable material will change with temperature, material stress and cable aging. Its update model is specifically expressed as:

[0087] μ(t)=μ 0 ·(1+β·T(t))

[0088] Where: μ 0 is the initial magnetic permeability; β is the temperature influence coefficient, which reflects the sensitivity of the material's magnetic permeability to temperature changes.

[0089] The cable parameters in the simulation process are dynamically updated in real time with time and cable operating conditions (such as current load, temperature, insulation aging, etc.). The total impedance Z(t) of the cable is composed of the real-time resistance R(t), capacitance C(t) and inductance L(t), expressed as:

[0090]

[0091] Where: Z(t) is the real-time impedance of the cable; ω is the angular frequency of the power system.

[0092] If the system is in normal operation, it has a high tolerance for high-frequency interference. At this time, the system will only trigger the adjustment of the RC absorber or electromagnetic shielding when the interference amplitude is large or the duration is long. The automatically generated elimination plan aims at minimum interference to avoid affecting the normal operation of the system.

[0093] If the load suddenly increases, the system may generate greater electromagnetic interference. At this time, the system dynamically adjusts the parameters of the RC absorber according to the strength and frequency of the interference signal, especially adjusts the resistor R and capacitor C to improve the ability to suppress transient interference caused by the sudden increase in load.

[0094] If the circuit breaker is opened, the system may generate transient high-frequency interference. At this time, the system will quickly detect the high-frequency signal caused by the transient arc and quickly adjust the capacitor C of the absorber to adapt to the high-frequency interference. In addition, the electromagnetic shielding parameters will also be automatically adjusted according to the interference frequency to reduce the impact of transient high-frequency signals on other equipment.

[0095] If the load is switched, the system will generate strong transient voltage fluctuations. The system will adjust the parameters of the RC absorber in real time to adapt to the voltage instability during load switching and reduce the high-frequency interference caused by transient fluctuations.

[0096] If there is a lightning strike, the system will detect very strong high-frequency electromagnetic interference. According to the frequency and intensity of the lightning signal, the system will automatically generate a resistor-capacitor absorber with a larger capacitance value and quickly adjust the electromagnetic shielding characteristics to reduce the strong transient high-frequency interference caused by the lightning strike.

[0097] If the fault is cleared, the system may generate more complex high-frequency interference signals. The system determines the frequency range of the interference signal through real-time spectrum analysis, and dynamically adjusts the absorber parameters and shielding characteristics to reduce the high-frequency transient interference generated during the fault clearing process.

[0098] If the equipment is disconnected from the grid or reconnected during equipment maintenance, voltage fluctuations may occur. The system will dynamically monitor the high-frequency interference signals during this process and ensure the stability of the grid during maintenance by adjusting the parameters of the absorber and shielding equipment.

[0099] If the generator sets are connected to the grid on a large scale, the system needs to pay special attention to the high-frequency interference signals caused by the instant of grid connection, and automatically adjust the capacitance and resistance of the RC absorber to ensure the interference elimination effect during the generator set grid connection process.

[0100] The parallel operation of the simulation scenarios includes: if the power system is struck by lightning, simulating the transient high-frequency overvoltage caused by the lightning strike; when the lightning strike occurs, evaluating the response process of the lightning arrester, and analyzing the voltage recovery after the lightning strike and its impact on the system;

[0101] If the power system short-circuit fault is cleared, the voltage fluctuation when the system returns to normal from the abnormal state is simulated; when the fault is cleared, the transient response during the voltage recovery process and the transient overvoltage after the fault is cleared are evaluated;

[0102] If equipment maintenance is being performed, the voltage fluctuations when the equipment is disconnected from the grid or reconnected are simulated; when equipment maintenance is being performed, the voltage instability caused by disconnection or reconnection is evaluated, and the voltage fluctuations during equipment maintenance are analyzed;

[0103] If the generator sets are connected to the grid on a large scale, the transient overvoltage generated when the generator sets are connected to the grid is simulated; when the generator sets are connected to the grid, the transient voltage fluctuations of the system are evaluated, and the voltage recovery process and system stability after grid connection are analyzed.

[0104] The parallel operation of the simulation scenario includes: if the system is in normal operation, the voltage, current and load changes in the system are processed in parallel by quantum computing to evaluate the stability of the system voltage; when the voltage fluctuation is close to an abnormal value, the system can automatically adjust the parameters of the voltage regulation device to ensure smooth operation;

[0105] If the load increases suddenly, quantum computing can process the sudden changes in voltage and current in parallel and evaluate the transient voltage response of the system; when the transient overvoltage caused by the sudden increase in load exceeds the predetermined threshold, the system will automatically generate and adjust the resistance and capacitance parameters of the RC absorber to prevent the voltage fluctuation from expanding.

[0106] The parallel operation of the simulation scenario includes: if the circuit breaker is opened, the quantum computing parallelly processes the transient high-frequency interference caused by the arc, and calculates the arc duration and its impact on the system; when the opening causes high-frequency overvoltage, the system will automatically optimize the parameters of the resistor-capacitor absorber and the electromagnetic shielding to reduce the impact of the transient overvoltage;

[0107] If the load switches, quantum computing will process the voltage fluctuations during load switching in parallel and evaluate the voltage recovery process after switching. When load switching causes transient voltage instability, the system will dynamically adjust the configuration of the voltage regulation device and the resistor-capacitor absorber to ensure that the voltage quickly returns to normal.

[0108] The parallel operation of the simulation scenario includes that if the system encounters a lightning strike, quantum computing can process the transient high-frequency overvoltage caused by the lightning strike in parallel and quickly evaluate the response of the lightning arrester; when the lightning strike signal is detected, the system automatically adjusts the discharge voltage parameters of the lightning arrester and optimizes the configuration of the resistor-capacitor absorber to suppress the overvoltage;

[0109] If the fault in the power system is cleared, quantum computing processes the fluctuations in voltage recovery in parallel and evaluates the transient response after the fault is cleared. When the fault clearing causes transient voltage fluctuations, the system optimizes the parameters of the RC absorber in real time to ensure that no additional overvoltage is generated during voltage recovery.

[0110] If the system is performing equipment maintenance, quantum computing will parallelly process voltage fluctuations during equipment disconnection or reconnection. When the voltage is unstable during maintenance, the system will dynamically adjust the parameters of the protection equipment to ensure that transient overvoltage is not caused when the equipment is connected or disconnected from the network.

[0111] If the generator sets are connected to the grid on a large scale, quantum computing will process the transient voltage fluctuations caused by the grid connection in parallel and simultaneously evaluate the voltage changes in other scenarios. When the generator sets are connected to the grid, the system will automatically adjust the configuration of the voltage regulation equipment and the resistor-capacitor absorber to ensure the overall stability of the system during the grid connection process.

[0112] 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.

[0113] Example 2

[0114] The second embodiment of the present invention is different from the previous embodiment in that:

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0119] 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.

[0120] 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. 10kV power system overvoltage protection and optimization method based on EMTP simulation technology, characterized by: include, Construct a multi-level simulation model to simulate and analyze low-frequency, medium-frequency and high-frequency overvoltages respectively; By collecting simulation data, the overvoltage trend of the power system is modeled and predicted using machine learning algorithms. During the simulation process, the cable modeling parameters, including resistance, capacitance and inductance, are dynamically updated in real time to simulate the actual operating status of the cable. Automatically generate and adjust interference elimination schemes based on high-frequency transient electromagnetic interference signals detected in real time; Use quantum computing to parallelize simulation scenarios and optimize overvoltage protection simultaneously; Summarize and optimize the simulation data to generate improved protection solutions.

2. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 1, characterized in that: The multi-level simulation model includes a comprehensive simulation analysis of steady-state voltage, transient voltage and high-frequency overvoltage caused by lightning in the 10kV power system, and simulates the response of the power system in different operation scenarios; The simulation objects include steady-state voltage in the low-frequency band, transient voltage in the medium-frequency band and transient overvoltage in the high-frequency band, which are used to simulate the normal operation of the system, load changes, circuit breaker opening and voltage fluctuations under lightning strikes.

3. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 2 is characterized in that: The multi-level simulation model includes processing the voltage fluctuations in each frequency band during the simulation process through spectrum analysis to reveal the frequency components in the voltage fluctuations, especially the key frequency characteristics in the overvoltages in different frequency bands; Based on the results of spectrum analysis, the protection design of the power system is optimized for low-frequency steady-state, medium-frequency transient and high-frequency transient phenomena, including adjusting the voltage regulation equipment, optimizing the arcing characteristics of the circuit breaker and configuring the response parameters of the lightning arrester. By comprehensively analyzing the simulation results of each frequency band, the overvoltage response characteristics of the whole system are formed, which provides a basis for the protection equipment in the power system and implements corresponding protection measures.

4. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 3 is characterized in that: The simulation analysis includes simulating the fluctuation of steady-state voltage if the power system is in normal operation; evaluating the long-term stability and trend change of system voltage when the load is running smoothly; If the power system encounters a sudden increase in load, the voltage fluctuation when the load is suddenly connected or removed is simulated; when the load changes drastically, the transient voltage response of the system in a short time is evaluated, and the voltage rise or fall is monitored; If the circuit breaker is opened, the arc behavior during the circuit breaker opening process is simulated; when the circuit breaker is opened, the possible overvoltage is simulated, and the impact of the arc duration on the transient voltage is evaluated. If the load switches, the voltage fluctuation when the load switches from one line to another is simulated; when the load switches, the fluctuation caused by voltage discontinuity is evaluated, and the voltage recovery process after switching is analyzed.

5. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 4, characterized in that: The parallel operation of the simulation scene includes: If the power system is struck by lightning, the transient high-frequency overvoltage caused by the lightning strike is simulated; when a lightning strike occurs, the response process of the lightning arrester is evaluated, and the voltage recovery after the lightning strike and its impact on the system are analyzed; If the power system short-circuit fault is cleared, the voltage fluctuation when the system returns to normal from the abnormal state is simulated; when the fault is cleared, the transient response during the voltage recovery process and the transient overvoltage after the fault is cleared are evaluated; If equipment maintenance is being performed, the voltage fluctuations when the equipment is disconnected from the grid or reconnected are simulated; when equipment maintenance is being performed, the voltage instability caused by disconnection or reconnection is evaluated, and the voltage fluctuations during equipment maintenance are analyzed; If the generator sets are connected to the grid on a large scale, the transient overvoltage generated when the generator sets are connected to the grid is simulated; when the generator sets are connected to the grid, the transient voltage fluctuations of the system are evaluated, and the voltage recovery process and system stability after grid connection are analyzed.

6. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 5, characterized in that: The parallel operation of the simulation scenario includes: if the system is in normal operation, the voltage, current and load changes in the system are processed in parallel by quantum computing to evaluate the stability of the system voltage; when the voltage fluctuation is close to an abnormal value, the system can automatically adjust the parameters of the voltage regulation device to ensure smooth operation; If the load increases suddenly, quantum computing can process the sudden changes in voltage and current in parallel and evaluate the transient voltage response of the system; when the transient overvoltage caused by the sudden increase in load exceeds the predetermined threshold, the system will automatically generate and adjust the resistance and capacitance parameters of the RC absorber.

7. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 6, characterized in that: The parallel operation of the simulation scenario includes: if the circuit breaker is opened, the quantum computing parallelly processes the transient high-frequency interference caused by the arc, and calculates the arc duration and its impact on the system; when the opening causes high-frequency overvoltage, the system will automatically optimize the parameters of the resistor-capacitor absorber and the electromagnetic shielding to reduce the impact of the transient overvoltage; If the load switches, quantum computing will process the voltage fluctuations during load switching in parallel and evaluate the voltage recovery process after switching. When load switching causes transient voltage instability, the system will dynamically adjust the configuration of the voltage regulator and the resistor-capacitor absorber to ensure that the voltage quickly returns to normal.

8. The 10kV power system overvoltage protection and optimization method based on EMTP simulation technology as claimed in claim 7, characterized in that: The parallel operation of the simulation scenario includes that if the system encounters a lightning strike, quantum computing can process the transient high-frequency overvoltage caused by the lightning strike in parallel and evaluate the response of the lightning arrester; when the lightning strike signal is detected, the system automatically adjusts the discharge voltage parameters of the lightning arrester and optimizes the configuration of the resistor-capacitor absorber to suppress the overvoltage; If the fault in the power system is cleared, quantum computing processes the fluctuations in voltage recovery in parallel and evaluates the transient response after the fault is cleared. When the fault clearing causes transient voltage fluctuations, the system optimizes the parameters of the RC absorber in real time to ensure that no additional overvoltage is generated during voltage recovery. If the system is performing equipment maintenance, quantum computing will parallelly process voltage fluctuations during equipment disconnection or reconnection. When the voltage is unstable during maintenance, the system will dynamically adjust the parameters of the protection equipment to ensure that transient overvoltage is not caused when the equipment is connected or disconnected from the network. If the generator sets are connected to the grid on a large scale, quantum computing will process the transient voltage fluctuations caused by the grid connection in parallel and simultaneously evaluate the voltage changes in other scenarios. When the generator sets are connected to the grid, the system will automatically adjust the configuration of the voltage regulation equipment and the resistor-capacitor absorber to ensure the overall stability of the system during the grid connection process.

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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