Converter transformer protection method and device, computer equipment, storage medium and computer program product

Abstract

The invention relates to a converter transformer protection method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring magnetic flux density information, voltage information and current information of a converter transformer to be analyzed; constructing a corresponding relation among the magnetic flux density information, the voltage information and the current information; determining target working condition information of the converter transformer to be analyzed according to the corresponding relation; determining a preset magnetic flux density threshold value corresponding to the target working condition information; determining target instruction information of a relay protection device associated with the to-be-analyzed converter transformer according to the difference between the magnetic flux density information and the preset magnetic flux density threshold; and controlling the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information. By adopting the method, the operation stability of the converter transformer can be improved.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a converter transformer protection method, device, computer equipment, computer-readable storage medium and computer program product. Background Art

[0002] In the electric power sector, protecting converter transformers is crucial to ensuring the stable operation of the power system.

[0003] In traditional technology, when protecting the converter transformer, a judgment method based on current and voltage detection signals is generally adopted; however, when an excitation surge current appears in the converter transformer, this method is prone to errors, causing the relay protection device connected to the converter transformer to trigger false operation, thereby causing the converter transformer to have low operating stability. Summary of the invention

[0004] Based on this, it is necessary to provide a converter transformer protection method, device, computer equipment, computer-readable storage medium and computer program product that can improve the stability of converter transformer operation in response to the above technical problems.

[0005] In a first aspect, the present application provides a converter transformer protection method, comprising:

[0006] Obtaining magnetic flux density information, voltage information and current information of the converter transformer to be analyzed;

[0007] Constructing a corresponding relationship between the magnetic flux density information, the voltage information and the current information;

[0008] According to the corresponding relationship, determining the target operating condition information of the converter transformer to be analyzed;

[0009] Determining a preset magnetic flux density threshold corresponding to the target operating condition information;

[0010] Determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold;

[0011] According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

[0012] In one of the embodiments, before determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship, the method further includes:

[0013] Acquiring inductance information of the converter transformer to be analyzed;

[0014] Constructing a target correspondence relationship among the magnetic flux density information, the voltage information, the current information and the inductance information;

[0015] Updating the corresponding relationship to the target corresponding relationship;

[0016] Determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship includes:

[0017] According to the target corresponding relationship, the target operating condition information of the converter transformer to be analyzed is determined.

[0018] In one embodiment, determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to the difference between the magnetic flux density information and the preset magnetic flux density threshold comprises:

[0019] Determine a preset magnetic flux change rate threshold corresponding to the target operating condition information, and determine the magnetic flux change rate of the converter transformer to be analyzed according to the magnetic flux density information;

[0020] According to the difference between the magnetic flux density information and the preset magnetic flux density threshold, and the difference between the magnetic flux change rate and the preset magnetic flux change rate threshold, the target instruction information of the relay protection device associated with the converter transformer to be analyzed is determined.

[0021] In one embodiment, determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship includes:

[0022] According to the corresponding relationship, determining the magnetic flux characteristic information of the converter transformer to be analyzed;

[0023] The operating condition information corresponding to the magnetic flux characteristic information is used as the target operating condition information.

[0024] In one embodiment, determining a preset magnetic flux density threshold corresponding to the target operating condition information includes:

[0025] Inputting the target operating condition information into a pre-built magnetic flux density threshold prediction model to obtain a plurality of candidate magnetic flux density thresholds corresponding to the target operating condition information and a prediction probability corresponding to each of the candidate magnetic flux density thresholds;

[0026] From the candidate magnetic flux density thresholds, the candidate magnetic flux density threshold with the largest predicted probability is screened out as the preset magnetic flux density threshold.

[0027] In one embodiment, before obtaining the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, the method further includes:

[0028] Obtaining voltage level information and application scenario information of candidate converter transformers;

[0029] From the candidate converter transformers, the candidate converter transformers whose voltage level information and application scenario information both meet preset conditions are screened out as the converter transformer to be analyzed.

[0030] In a second aspect, the present application also provides a converter transformer protection device, comprising:

[0031] An information acquisition module, used to acquire magnetic flux density information, voltage information and current information of the converter transformer to be analyzed;

[0032] A relationship building module, used to build a corresponding relationship between the magnetic flux density information, the voltage information and the current information;

[0033] A working condition determination module, used to determine the target working condition information of the converter transformer to be analyzed according to the corresponding relationship;

[0034] A threshold determination module, used to determine a preset magnetic flux density threshold corresponding to the target operating condition information;

[0035] An instruction determination module, used to determine target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold;

[0036] The transformer protection module is used to control the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information.

[0037] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0038] Obtaining magnetic flux density information, voltage information and current information of the converter transformer to be analyzed;

[0039] Constructing a corresponding relationship between the magnetic flux density information, the voltage information and the current information;

[0040] According to the corresponding relationship, determining the target operating condition information of the converter transformer to be analyzed;

[0041] Determining a preset magnetic flux density threshold corresponding to the target operating condition information;

[0042] Determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold;

[0043] According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

[0044] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0045] Obtaining magnetic flux density information, voltage information and current information of the converter transformer to be analyzed;

[0046] Constructing a corresponding relationship between the magnetic flux density information, the voltage information and the current information;

[0047] According to the corresponding relationship, determining the target operating condition information of the converter transformer to be analyzed;

[0048] Determining a preset magnetic flux density threshold corresponding to the target operating condition information;

[0049] Determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold;

[0050] According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

[0051] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0052] Obtaining magnetic flux density information, voltage information and current information of the converter transformer to be analyzed;

[0053] Constructing a corresponding relationship between the magnetic flux density information, the voltage information and the current information;

[0054] According to the corresponding relationship, determining the target operating condition information of the converter transformer to be analyzed;

[0055] Determining a preset magnetic flux density threshold corresponding to the target operating condition information;

[0056] Determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold;

[0057] According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

[0058] The above-mentioned converter transformer protection method, device, computer equipment, storage medium and computer program product first obtain the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, and establish a corresponding relationship between the magnetic flux density information, voltage information and current information, and then determine the target operating condition information of the converter transformer to be analyzed based on the corresponding relationship, and then determine the preset magnetic flux density threshold corresponding to the target operating condition information, and then, based on the difference between the magnetic flux density information and the preset magnetic flux density threshold, determine the target instruction information of the relay protection device associated with the converter transformer to be analyzed, and finally, according to the target instruction information, control the relay protection device to perform protection processing on the converter transformer to be analyzed. In this way, when protecting the converter transformer, by constructing the correspondence between the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, and based on the correspondence, the operating condition of the converter transformer can be accurately obtained, so that the corresponding preset magnetic flux density threshold can be accurately obtained, and then the accuracy of determining the target instruction information can be improved, so that the relay protection device connected to the converter transformer can protect the converter transformer more accurately, which is beneficial to improving the stability of the operation of the converter transformer; moreover, this method avoids the error-prone judgment method based on the current and voltage detection signals when an excitation surge current occurs in the converter transformer, which leads to the relay protection device connected to the converter transformer triggering malfunction, thereby causing the defect of low stability of the operation of the converter transformer; further improving the stability of the operation of the converter transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 A schematic diagram of a converter transformer protection method according to an embodiment;

[0061] Figure 2 is a flow chart of a converter transformer protection method in another embodiment;

[0062] Figure 3 A schematic flow chart of a method for optimizing a converter transformer relay protection device based on flux braking in one embodiment;

[0063] Figure 4 is a schematic diagram of magnetic flux density under three working conditions in one embodiment;

[0064] Figure 5A schematic diagram of the division of the action area and the braking area of ​​the relay protection device after optimization in one embodiment;

[0065] Figure 6 is a structural block diagram of a converter transformer protection device in one embodiment;

[0066] Figure 7 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0068] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0069] In an exemplary embodiment, Figure 1 As shown, a converter transformer protection method is provided. This embodiment uses the method applied to a server as an example for illustration. It can be understood that the method can also be applied to a terminal, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. The terminal can be, but is not limited to, various personal computers, laptops, smart phones, and tablet computers; the server can be implemented with an independent server or a server cluster consisting of multiple servers. In this embodiment, the method includes the following steps:

[0070] Step S101, obtaining magnetic flux density information, voltage information and current information of the converter transformer to be analyzed.

[0071] The converter transformer to be analyzed refers to a converter transformer that needs protection treatment.

[0072] The magnetic flux density information is used to represent the magnetic flux density value that changes with time in the converter transformer to be analyzed.

[0073] The voltage information is used to represent the voltage value that changes with time in the converter transformer to be analyzed.

[0074] The current information is used to represent the current value that changes with time in the converter transformer to be analyzed.

[0075] Exemplarily, the server responds to the transformer protection instruction for the converter transformer to be analyzed, and determines the flux density sensor, voltage transformer and current transformer corresponding to the converter transformer to be analyzed; then, the server collects the flux density information, voltage information and current information of the converter transformer to be analyzed through the flux density sensor, voltage transformer and current transformer corresponding to the converter transformer to be analyzed.

[0076] Step S102, constructing a corresponding relationship among magnetic flux density information, voltage information and current information.

[0077] The corresponding relationship is used to represent the correlation information among the magnetic flux density information, the voltage information and the current information.

[0078] Exemplarily, the server preprocesses the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed to obtain the preprocessed magnetic flux density information, preprocessed voltage information and preprocessed current information of the converter transformer to be analyzed; then, the server constructs a corresponding relationship between the magnetic flux density information, voltage information and current information based on the preprocessed magnetic flux density information, preprocessed voltage information and preprocessed current information.

[0079] For example, the server can construct the corresponding relationship between the magnetic flux density information, the voltage information and the current information through the following formula:

[0080] , formula (1)

[0081] in, , , is the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed at time t, and R is the winding resistance inside the converter transformer to be analyzed.

[0082] Step S103: determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship.

[0083] The target operating condition information refers to the operating condition information of the converter transformer to be analyzed, including normal operating conditions, magnetizing inrush current conditions and fault conditions.

[0084] Exemplarily, the server classifies the corresponding relationship and obtains the operating condition information matching the corresponding relationship as the target operating condition information of the converter transformer to be analyzed.

[0085] Step S104, determining a preset magnetic flux density threshold corresponding to the target operating condition information.

[0086] The preset magnetic flux density threshold refers to a pre-set magnetic flux density threshold, which is used to judge the magnetic flux density information of the converter transformer to be analyzed. It should be noted that the preset magnetic flux density threshold depends on the situation.

[0087] Exemplarily, the server queries the corresponding relationship between the target operating condition information and the preset magnetic flux density threshold according to the target operating condition information, and obtains the preset magnetic flux density threshold corresponding to the target operating condition information.

[0088] Step S105: determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to the difference between the magnetic flux density information and a preset magnetic flux density threshold.

[0089] Among them, the relay protection device refers to the equipment used to protect the converter transformer to be analyzed.

[0090] The target command information refers to the command information for controlling the relay protection device, including protection commands or braking commands.

[0091] Exemplarily, the server determines the target instruction information of the relay protection device associated with the converter transformer to be analyzed based on the difference between the magnetic flux density information and the preset magnetic flux density threshold; for example, when the magnetic flux density information is monitored to be greater than the preset magnetic flux density threshold, the server determines that the target instruction information of the relay protection device associated with the converter transformer to be analyzed is a protection instruction; when the magnetic flux density information is monitored to be less than or equal to the preset magnetic flux density threshold, the server determines that the target instruction information of the relay protection device associated with the converter transformer to be analyzed is a braking instruction.

[0092] Step S106: According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

[0093] Exemplarily, when the target instruction information is a protection instruction, the server controls the relay protection device to start the protection action to prevent the converter transformer to be analyzed from being damaged due to faults or abnormal inrush currents; when the target instruction information is a braking instruction (indicating that the current operating condition of the converter transformer to be analyzed is within a safe range), the server controls the relay protection device not to start the protection action.

[0094] In the above-mentioned converter transformer protection method, the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed are first obtained, and the corresponding relationship between the magnetic flux density information, voltage information and current information is established. Then, based on the corresponding relationship, the target operating condition information of the converter transformer to be analyzed is determined. Then, the preset magnetic flux density threshold corresponding to the target operating condition information is determined. Then, based on the difference between the magnetic flux density information and the preset magnetic flux density threshold, the target instruction information of the relay protection device associated with the converter transformer to be analyzed is determined. Finally, based on the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed. In this way, when protecting the converter transformer, by constructing the correspondence between the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, and based on the correspondence, the operating condition of the converter transformer can be accurately obtained, so that the corresponding preset magnetic flux density threshold can be accurately obtained, and then the accuracy of determining the target instruction information can be improved, so that the relay protection device connected to the converter transformer can protect the converter transformer more accurately, which is beneficial to improving the stability of the operation of the converter transformer; moreover, this method avoids the error-prone judgment method based on the current and voltage detection signals when an excitation surge current occurs in the converter transformer, which leads to the relay protection device connected to the converter transformer triggering malfunction, thereby causing the defect of low stability of the operation of the converter transformer; further improving the stability of the operation of the converter transformer.

[0095] In an exemplary embodiment, the above step S103, before determining the target operating condition information of the converter transformer to be analyzed based on the corresponding relationship, specifically includes the following contents: obtaining the inductance information of the converter transformer to be analyzed; constructing a target corresponding relationship between the magnetic flux density information, voltage information, current information and inductance information; and updating the corresponding relationship to the target corresponding relationship.

[0096] Then, according to the corresponding relationship, the target operating condition information of the converter transformer to be analyzed is determined, which specifically includes the following contents: according to the target corresponding relationship, the target operating condition information of the converter transformer to be analyzed is determined.

[0097] The inductance information is used to represent the inductance value of the converter transformer to be analyzed that changes with time.

[0098] The target correspondence relationship is used to represent the correlation information among the magnetic flux density information, the voltage information, the current information and the inductance information.

[0099] Exemplarily, the server determines the inductive sensor corresponding to the converter transformer to be analyzed; then, the server collects the inductance information of the converter transformer to be analyzed through the inductive sensor corresponding to the converter transformer to be analyzed; then, the server constructs a target correspondence relationship among the magnetic flux density information, voltage information, current information and inductance information, and updates the correspondence relationship among the magnetic flux density information, voltage information and current information to the target correspondence relationship; then, the server classifies the target correspondence relationship to obtain the operating condition information matching the target correspondence relationship as the target operating condition information of the converter transformer to be analyzed.

[0100] For example, the server can construct the target correspondence between the magnetic flux density information, voltage information, current information and inductance information through the following formula:

[0101] in, It is the inductance information of the converter transformer to be analyzed.

[0102] In this embodiment, by combining the inductance information of the converter transformer to be analyzed, a more accurate target correspondence relationship can be obtained, and then more accurate target operating condition information can be obtained, which is beneficial to improving the accuracy of determining the target operating condition information of the converter transformer to be analyzed and providing a data basis for subsequent analysis.

[0103] In an exemplary embodiment, the above step S105 determines the target instruction information of the relay protection device associated with the converter transformer to be analyzed based on the difference between the magnetic flux density information and the preset magnetic flux density threshold, and specifically includes the following contents: determining the preset magnetic flux change rate threshold corresponding to the target operating condition information, and determining the magnetic flux change rate of the converter transformer to be analyzed based on the magnetic flux density information; determining the target instruction information of the relay protection device associated with the converter transformer to be analyzed based on the difference between the magnetic flux density information and the preset magnetic flux density threshold, and the difference between the magnetic flux change rate and the preset magnetic flux change rate threshold.

[0104] The preset magnetic flux change rate threshold refers to a preset magnetic flux change rate threshold, which is used to judge the magnetic flux change rate of the converter transformer to be analyzed. It should be noted that the preset magnetic flux change rate threshold depends on the situation.

[0105] The flux change rate is used to indicate the change speed of the flux density value of the converter transformer to be analyzed.

[0106] Exemplarily, the server queries the correspondence between the target operating condition information and the preset magnetic flux change rate threshold based on the target operating condition information, and obtains the preset magnetic flux change rate threshold corresponding to the target operating condition information; then, the server performs derivative processing on the magnetic flux density information to obtain the magnetic flux change rate of the converter transformer to be analyzed; then, the server determines the target instruction information of the relay protection device associated with the converter transformer to be analyzed based on the difference between the magnetic flux density information and the preset magnetic flux density threshold, and the difference between the magnetic flux change rate and the preset magnetic flux change rate threshold; for example, when the magnetic flux density information is greater than the preset magnetic flux density threshold, or the magnetic flux change rate is greater than the preset magnetic flux change rate threshold, the server determines that the target instruction information of the relay protection device associated with the converter transformer to be analyzed is a protection instruction; when the magnetic flux density information is less than or equal to the preset magnetic flux density threshold, and the magnetic flux change rate is less than or equal to the preset magnetic flux change rate threshold, the server determines that the target instruction information of the relay protection device associated with the converter transformer to be analyzed is a braking instruction.

[0107] In this embodiment, the target instruction information of the relay protection device is determined by simultaneously considering the difference between the magnetic flux density information and the preset magnetic flux density threshold, as well as the difference between the magnetic flux change rate and the preset magnetic flux change rate threshold. This method can more comprehensively reflect the operating status of the converter transformer and reduce the possibility of misjudgment and missed judgment than judging based on only a single parameter.

[0108] In an exemplary embodiment, the above step S103, based on the corresponding relationship, determines the target operating condition information of the converter transformer to be analyzed, specifically including the following contents: based on the corresponding relationship, determines the flux characteristic information of the converter transformer to be analyzed; and uses the operating condition information corresponding to the flux characteristic information as the target operating condition information.

[0109] The magnetic flux characteristic information is used to represent the characteristics of the magnetic flux characteristic information of the converter transformer to be analyzed.

[0110] Exemplarily, the server determines the flux characteristic information that matches the corresponding relationship based on the corresponding relationship, as the flux characteristic information of the converter transformer to be analyzed; then, the server queries the corresponding relationship between the flux characteristic information and the operating condition information based on the flux characteristic information, and obtains the operating condition information corresponding to the flux characteristic information as the target operating condition information.

[0111] In this embodiment, the flux characteristic information of the converter transformer to be analyzed is determined through precise corresponding relationships, so that the internal magnetic field state of the transformer under different operating conditions can be accurately reflected, and more accurate target operating condition information can be obtained, which is conducive to improving the accuracy of determining the target operating condition information.

[0112] In an exemplary embodiment, the above step S104 determines the preset magnetic flux density threshold corresponding to the target operating condition information, which specifically includes the following contents: inputting the target operating condition information into a pre-constructed magnetic flux density threshold prediction model to obtain multiple candidate magnetic flux density thresholds corresponding to the target operating condition information, and the prediction probability corresponding to each candidate magnetic flux density threshold; from each candidate magnetic flux density threshold, screening out the candidate magnetic flux density threshold with the largest prediction probability as the preset magnetic flux density threshold.

[0113] Among them, the magnetic flux density threshold prediction model refers to a network model that can use the target operating condition information to obtain a preset magnetic flux density threshold corresponding to the target operating condition information, such as a convolutional neural network model, a random forest model, etc.

[0114] The candidate magnetic flux density threshold refers to the magnetic flux density threshold to be selected.

[0115] The prediction probability refers to the possibility that the magnetic flux density threshold prediction model determines that the candidate magnetic flux density threshold is correct.

[0116] Exemplarily, the server inputs the target operating condition information into a pre-built magnetic flux density threshold prediction model to obtain multiple candidate magnetic flux density thresholds corresponding to the target operating condition information, and the prediction probability corresponding to each candidate magnetic flux density threshold; then, the server performs a rationality check on each candidate magnetic flux density threshold to obtain a check result; then, when the check result shows that each candidate magnetic flux density threshold is reasonable, the server screens out the candidate magnetic flux density threshold with the largest prediction probability from each candidate magnetic flux density threshold, and uses the candidate magnetic flux density threshold as the preset magnetic flux density threshold.

[0117] In this embodiment, by using a flux density threshold prediction model and screening candidate flux density thresholds based on the prediction probability, a more accurate preset flux density threshold can be obtained, which is beneficial to improving the accuracy of determining the preset flux density threshold and providing a data basis for subsequent protection processing of the converter transformer to be analyzed.

[0118] In an exemplary embodiment, the above step S101, before obtaining the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, specifically includes the following contents: obtaining the voltage level information and application scenario information of the candidate converter transformers; and screening out, from each candidate converter transformer, the candidate converter transformers whose voltage level information and application scenario information meet the preset conditions as the converter transformer to be analyzed.

[0119] Among them, the voltage level information refers to the rated voltage level of the candidate converter transformer, such as safety voltage, low voltage, high voltage, extra-high voltage and ultra-high voltage.

[0120] The application scenario information refers to the use environment of the candidate converter transformer, including altitude information and temperature difference information.

[0121] Among them, the preset conditions refer to pre-set judgment conditions, which are used to judge the voltage level information and application scenario information of the candidate converter transformer.

[0122] Exemplarily, the server obtains voltage level information and application scenario information of candidate converter transformers; then, the server selects candidate converter transformers whose voltage level information and application scenario information meet preset conditions from each candidate converter transformer as the converter transformer to be analyzed; for example, the server selects candidate converter transformers whose voltage level information is ultra-high voltage, whose altitude information is within a preset altitude threshold, and whose temperature difference information is within a preset temperature difference threshold from each candidate converter transformer as the converter transformer to be analyzed.

[0123] In this embodiment, by simultaneously considering the voltage level information and application scenario information of the candidate converter transformers, a comprehensive consideration is made from multiple dimensions, thereby being able to more accurately screen out converter transformers that meet actual needs, which is beneficial to improving the accuracy of determining the converter transformer to be analyzed.

[0124] In an exemplary embodiment, Figure 2 As shown, another converter transformer protection method is provided, which is described by taking the application of the method to a server as an example, and includes the following steps:

[0125] Step S201, obtaining voltage level information and application scenario information of candidate converter transformers.

[0126] Step S202: Select, from among the candidate converter transformers, the candidate converter transformers whose voltage level information and application scenario information both meet preset conditions as the converter transformer to be analyzed.

[0127] Step S203, constructing a corresponding relationship among the magnetic flux density information, the voltage information and the current information.

[0128] Step S204: determining the magnetic flux characteristic information of the converter transformer to be analyzed according to the corresponding relationship.

[0129] Step S205: taking the operating condition information corresponding to the magnetic flux characteristic information as the target operating condition information.

[0130] Step S206, inputting the target operating condition information into a pre-built magnetic flux density threshold prediction model to obtain a plurality of candidate magnetic flux density thresholds corresponding to the target operating condition information and a prediction probability corresponding to each candidate magnetic flux density threshold.

[0131] Step S207, selecting a candidate magnetic flux density threshold with the highest predicted probability from among the candidate magnetic flux density thresholds as a preset magnetic flux density threshold.

[0132] Step S208, determining a preset magnetic flux change rate threshold corresponding to the target operating condition information, and determining the magnetic flux change rate of the converter transformer to be analyzed according to the magnetic flux density information.

[0133] Step S209, determining target instruction information of the relay protection device associated with the converter transformer to be analyzed according to the difference between the magnetic flux density information and the preset magnetic flux density threshold, and the difference between the magnetic flux change rate and the preset magnetic flux change rate threshold.

[0134] Step S210: According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

[0135] In the above-mentioned converter transformer protection method, when protecting the converter transformer, a correspondence between the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed is constructed, and the operating condition of the converter transformer can be accurately obtained according to the correspondence, so that the corresponding preset magnetic flux density threshold can be accurately obtained, thereby improving the accuracy of determining the target instruction information, so that the relay protection device connected to the converter transformer can protect the converter transformer more accurately, which is beneficial to improving the stability of the operation of the converter transformer; moreover, this method avoids the error-prone judgment method based on the current and voltage detection signals when an excitation surge current occurs in the converter transformer, resulting in the relay protection device connected to the converter transformer triggering malfunction, thereby causing the defect of low stability of the operation of the converter transformer; further improving the stability of the operation of the converter transformer.

[0136] In an exemplary embodiment, in order to more clearly illustrate the converter transformer protection method provided in the embodiment of the present application, the converter transformer protection method is specifically described below with a specific embodiment. Figure 3 As shown, the present application also provides a method for optimizing a converter transformer relay protection device based on flux braking. When protecting the converter transformer, the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed are first obtained, and the corresponding relationship between the magnetic flux density information, voltage information and current information is constructed. Then, according to the corresponding relationship, the target operating condition information of the converter transformer to be analyzed is determined, and then the preset magnetic flux density threshold corresponding to the target operating condition information is determined. Then, according to the difference between the magnetic flux density information and the preset magnetic flux density threshold, the target instruction information of the relay protection device associated with the converter transformer to be analyzed is determined. Finally, according to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed. Specifically, it includes the following contents:

[0137] 1. Establish nonlinear mapping relationship:

[0138] Data collection: During the operation of the converter transformer, voltage, current collection and flux measurement technology are used to collect voltage , Current and magnetic flux density Real-time data;

[0139] Using the collected data, a numerical method is used to establish the converter transformer flux density ,Voltage With current The nonlinear mapping relationship between them; the mapping relationship formula is as follows:

[0140] , formula (1)

[0141] in: , , are the magnetic flux density, voltage and current at time t; R is the winding resistance.

[0142] Considering the core saturation effect, the nonlinear inductance through the magnetic flux , the corrected flux calculation formula is:

[0143] , formula (2)

[0144] in, It is the flux-dependent inductance, which indicates the change of inductance value with magnetic flux.

[0145] Verify the accuracy and reliability of the established mapping relationship model.

[0146] 2. Identification of different working conditions:

[0147] Working condition classification: According to the flux mapping relationship, different operating conditions are classified, mainly including normal operation, excitation inrush current and fault state. Each state is analyzed in detail to identify its characteristics, such as Figure 4 shown.

[0148] Feature extraction: Quantitative analysis of the flux characteristics of each operating condition.

[0149] By analyzing the flux mapping relationship, the flux characteristics under normal operation, magnetizing inrush current and internal fault are determined, including:

[0150] The linear relationship between magnetic flux and current under normal working conditions:

[0151] , formula (3)

[0152] in, is the proportionality coefficient, is the magnetic flux density value at time t.

[0153] The flux change during the closing excitation inrush current is a nonlinear characteristic, which can be expressed as:

[0154] , formula (4)

[0155] in, is the initial magnetic flux, α is the time constant, ω is the electrical angular frequency, and θ is the closing angle.

[0156] Under fault conditions, the magnetic flux changes dramatically, and its rate of change is:

[0157] , formula (5)

[0158] in, , , are the magnetic flux density, voltage and current at the moment of fault, respectively. is the fault resistance.

[0159] Feature summary: Summarize the flux characteristics of the three working conditions to lay the foundation for the subsequent setting of thresholds.

[0160] 3. Delineate the braking area and action area based on the threshold:

[0161] Real-time monitoring of magnetic flux density: The system monitors the magnetic flux density of the transformer in real time and compares it with the set threshold, such as Figure 5 shown.

[0162] When the magnetic flux meets or When the system enters the action zone, the relay protection device starts the protection action to prevent the system from being damaged due to faults or abnormal inrush currents.

[0163] On the contrary, if the flux Not Exceeded and Less than The system will then enter the braking zone and continue monitoring without triggering a trip.

[0164] Dynamic protection mechanism: Every time the flux data is updated, the system automatically determines the current state and switches the braking area and the action area to ensure real-time protection. In addition, the system needs to have self-learning capabilities to optimize threshold settings and adjustments.

[0165] In the above embodiment, when protecting the converter transformer, the corresponding relationship between the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed is constructed, and the working condition of the converter transformer can be accurately obtained according to the corresponding relationship, so that the corresponding preset magnetic flux density threshold can be accurately obtained, and then the determination accuracy of the target instruction information can be improved, so that the relay protection device connected to the converter transformer can protect the converter transformer more accurately, which is conducive to improving the stability of the operation of the converter transformer; moreover, the method avoids the defect that when the converter transformer has an excitation inrush current, the judgment method based on the current and voltage detection signals is prone to error, resulting in the relay protection device connected to the converter transformer triggering malfunction, thereby causing the low stability of the operation of the converter transformer; further improves the stability of the operation of the converter transformer. At the same time, by introducing the magnetic flux braking principle, this scheme can effectively distinguish between normal working conditions, excitation inrush current and fault conditions based on the nonlinear mapping relationship between magnetic flux density, voltage and current. Compared with the traditional relay protection device based on current and voltage, this method greatly improves the identification accuracy of the protection device, especially reduces the false operation caused by the excitation inrush current, and ensures the operation reliability of the system under complex working conditions. This scheme sets different braking and action thresholds according to the magnetic flux characteristics under different working conditions, especially introduces the time decay threshold adjustment method under the condition of excitation inrush current. By dynamically adjusting the braking threshold, the relay protection device can respond to instantaneous changes more intelligently, avoid the limitations of the traditional fixed threshold, and improve the real-time and flexibility of the protection action. This scheme can be applied to various complex power conditions, especially in the face of abnormal conditions such as short-circuit faults and excitation inrush currents of transformers, through more detailed magnetic flux characteristic analysis and accurate protection action judgment, the safe and stable operation of the power system is effectively guaranteed. This scheme proposes a dynamic protection mechanism based on real-time monitoring of magnetic flux density, which can automatically adjust the braking area and action area each time the magnetic flux data is updated. At the same time, the system has self-learning ability, which can continuously optimize the threshold setting according to the operating conditions, so that the relay protection device has higher adaptability. This solution accurately divides the braking area and the action area, and can quickly start the protection action when the system is in an abnormal operating condition, effectively preventing equipment damage caused by faults or abnormal inrush currents, thereby extending the service life of the converter transformer and reducing the maintenance cost of the power system.

[0166] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0167] Based on the same inventive concept, the embodiment of the present application also provides a converter transformer protection device for implementing the converter transformer protection method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more converter transformer protection device embodiments provided below can refer to the limitations of the converter transformer protection method above, and will not be repeated here.

[0168] In an exemplary embodiment, Figure 6 As shown, a converter transformer protection device is provided, including: an information acquisition module 601, a relationship construction module 602, a working condition determination module 603, a threshold determination module 604, an instruction determination module 605 and a transformer protection module 606, wherein:

[0169] The information acquisition module 601 is used to acquire the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed.

[0170] The relationship building module 602 is used to build the corresponding relationship between the magnetic flux density information, the voltage information and the current information.

[0171] The operating condition determination module 603 is used to determine the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship.

[0172] The threshold determination module 604 is used to determine a preset magnetic flux density threshold corresponding to the target operating condition information.

[0173] The instruction determination module 605 is used to determine the target instruction information of the relay protection device associated with the converter transformer to be analyzed according to the difference between the magnetic flux density information and the preset magnetic flux density threshold.

[0174] The transformer protection module 606 is used to control the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information.

[0175] In an exemplary embodiment, the converter transformer protection device also includes a relationship updating module, which is used to obtain the inductance information of the converter transformer to be analyzed; construct a target correspondence relationship between the magnetic flux density information, voltage information, current information and inductance information; and update the correspondence relationship to a target correspondence relationship; the operating condition determination module 603 is also used to determine the target operating condition information of the converter transformer to be analyzed based on the target correspondence relationship.

[0176] In an exemplary embodiment, the instruction determination module 605 is also used to determine a preset flux change rate threshold corresponding to the target operating condition information, and to determine the flux change rate of the converter transformer to be analyzed based on the flux density information; based on the difference between the flux density information and the preset flux density threshold, and the difference between the flux change rate and the preset flux change rate threshold, determine the target instruction information of the relay protection device associated with the converter transformer to be analyzed.

[0177] In an exemplary embodiment, the operating condition determination module 603 is further used to determine the magnetic flux characteristic information of the converter transformer to be analyzed according to the corresponding relationship; and use the operating condition information corresponding to the magnetic flux characteristic information as the target operating condition information.

[0178] In an exemplary embodiment, the threshold determination module 604 is also used to input the target operating condition information into a pre-built magnetic flux density threshold prediction model to obtain multiple candidate magnetic flux density thresholds corresponding to the target operating condition information, and the prediction probability corresponding to each candidate magnetic flux density threshold; from each candidate magnetic flux density threshold, the candidate magnetic flux density threshold with the largest prediction probability is screened out as the preset magnetic flux density threshold.

[0179] In an exemplary embodiment, the converter transformer protection device also includes a transformer screening module, which is used to obtain voltage level information and application scenario information of candidate converter transformers; from each candidate converter transformer, the candidate converter transformer whose voltage level information and application scenario information meet preset conditions is screened out as the converter transformer to be analyzed.

[0180] Each module in the above converter transformer protection device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0181] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 7As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as magnetic flux density information, voltage information, and current information. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a converter transformer protection method is implemented.

[0182] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0183] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0184] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0185] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0186] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0187] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0188] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A converter transformer protection method, characterized in that: The method comprises: Obtaining magnetic flux density information, voltage information and current information of the converter transformer to be analyzed; Constructing a corresponding relationship between the magnetic flux density information, the voltage information and the current information; According to the corresponding relationship, determining the target operating condition information of the converter transformer to be analyzed; Determining a preset magnetic flux density threshold corresponding to the target operating condition information; Determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold; According to the target instruction information, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed.

2. The method according to claim 1, characterized in that Before determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship, the method further includes: Acquiring inductance information of the converter transformer to be analyzed; Constructing a target correspondence relationship among the magnetic flux density information, the voltage information, the current information and the inductance information; Updating the corresponding relationship to the target corresponding relationship; Determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship includes: According to the target corresponding relationship, the target operating condition information of the converter transformer to be analyzed is determined.

3. The method according to claim 1, characterized in that The step of determining target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold comprises: Determine a preset magnetic flux change rate threshold corresponding to the target operating condition information, and determine the magnetic flux change rate of the converter transformer to be analyzed according to the magnetic flux density information; According to the difference between the magnetic flux density information and the preset magnetic flux density threshold, and the difference between the magnetic flux change rate and the preset magnetic flux change rate threshold, the target instruction information of the relay protection device associated with the converter transformer to be analyzed is determined.

4. The method according to claim 1, characterized in that: Determining the target operating condition information of the converter transformer to be analyzed according to the corresponding relationship includes: According to the corresponding relationship, determining the magnetic flux characteristic information of the converter transformer to be analyzed; The operating condition information corresponding to the magnetic flux characteristic information is used as the target operating condition information.

5. The method according to claim 1, characterized in that The determining of a preset magnetic flux density threshold corresponding to the target operating condition information includes: Inputting the target operating condition information into a pre-built magnetic flux density threshold prediction model to obtain a plurality of candidate magnetic flux density thresholds corresponding to the target operating condition information and a prediction probability corresponding to each of the candidate magnetic flux density thresholds; From the candidate magnetic flux density thresholds, the candidate magnetic flux density threshold with the largest predicted probability is screened out as the preset magnetic flux density threshold.

6. The method according to any one of claims 1 to 5, characterized in that Before obtaining the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, it also includes: Obtaining voltage level information and application scenario information of candidate converter transformers; From the candidate converter transformers, the candidate converter transformers whose voltage level information and application scenario information both meet preset conditions are screened out as the converter transformer to be analyzed.

7. A converter transformer protection device, characterized in that: The device comprises: An information acquisition module, used to acquire magnetic flux density information, voltage information and current information of the converter transformer to be analyzed; A relationship building module, used to build a corresponding relationship between the magnetic flux density information, the voltage information and the current information; A working condition determination module, used to determine the target working condition information of the converter transformer to be analyzed according to the corresponding relationship; A threshold determination module, used to determine a preset magnetic flux density threshold corresponding to the target operating condition information; An instruction determination module, used to determine target instruction information of a relay protection device associated with the converter transformer to be analyzed according to a difference between the magnetic flux density information and the preset magnetic flux density threshold; The transformer protection module is used to control the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information.

8. 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 6 are implemented.

9. 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 6 are implemented.

10. A computer program product, comprising a computer program, 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 6 are implemented.

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