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

Abstract

The application 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: obtaining magnetic flux density information, voltage information and current information of a converter transformer to be analyzed; constructing a corresponding relationship 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 relationship; determining a preset magnetic flux density threshold corresponding to the target working condition information; 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; and controlling the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information. The method can improve the stability of the operation of the converter transformer.

Description

TECHNICAL FIELD

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

[0002] In the field of electric power, protecting the converter transformer is crucial for ensuring the stable operation of the power system.

[0003] In the prior art, when protecting the converter transformer, a detection signal based on current and voltage is generally used for judgment. However, in the case of magnetizing inrush current of the converter transformer, this method is prone to errors, which leads to the triggering of false actions of the relay protection device connected to the converter transformer, and further causes the low stability of the operation of the converter transformer. SUMMARY

[0004] Therefore, it is necessary to provide a converter transformer protection method, device, computer equipment, computer readable storage medium and computer program product capable of improving the stability of the operation of the converter transformer.

[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 a converter transformer to be analyzed;

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

[0008] determining target working condition information of the converter transformer to be analyzed according to the corresponding relationship;

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

[0010] 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;

[0011] controlling the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information.

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

[0013] obtaining 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 correspondence relationship as the target correspondence relationship;

[0016] determining the target working condition information of the analyzed converter transformer according to the correspondence relationship, comprises:

[0017] determining the target working condition information of the analyzed converter transformer according to the target correspondence relationship.

[0018] In one embodiment, the target instruction information of the relay protection device associated with the analyzed converter transformer is determined according to the difference between the magnetic flux density information and the preset magnetic flux density threshold value, comprising:

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

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

[0021] In one embodiment, the target working condition information of the analyzed converter transformer is determined according to the correspondence relationship, comprising:

[0022] determining the magnetic flux characteristic information of the analyzed converter transformer according to the correspondence relationship;

[0023] the working condition information corresponding to the magnetic flux characteristic information is taken as the target working condition information.

[0024] In one embodiment, the preset magnetic flux density threshold value corresponding to the target working condition information is determined, comprising:

[0025] inputting the target working condition information into a pre-constructed magnetic flux density threshold value prediction model to obtain a plurality of candidate magnetic flux density threshold values corresponding to the target working condition information and a prediction probability corresponding to each candidate magnetic flux density threshold value;

[0026] from each of the candidate magnetic flux density threshold values, the candidate magnetic flux density threshold value with the maximum prediction probability is selected as the preset magnetic flux density threshold value.

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

[0028] obtain voltage grade information and application scenario information of the candidate converter transformers;

[0029] From each of the candidate converter transformers, a candidate converter transformer whose voltage grade information and application scenario information both satisfy a preset condition is selected as the converter transformer to be analyzed.

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

[0031] An information obtaining module is configured to obtain magnetic flux density information, voltage information and current information of a converter transformer to be analyzed.

[0032] A relationship constructing module is configured to construct a corresponding relationship among the magnetic flux density information, the voltage information and the current information.

[0033] A working condition determining module is configured to determine target working condition information of the converter transformer to be analyzed according to the corresponding relationship.

[0034] A threshold value determining module is configured to determine a preset magnetic flux density threshold value corresponding to the target working condition information.

[0035] An instruction determining module is configured 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 value.

[0036] A transformer protection module is configured 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, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the following steps when executing the computer program:

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

[0039] construct a corresponding relationship among the magnetic flux density information, the voltage information and the current information.

[0040] determine target working condition information of the converter transformer to be analyzed according to the corresponding relationship.

[0041] determine a preset magnetic flux density threshold value corresponding to the target working condition information.

[0042] 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 value.

[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] Establishing a correspondence between the magnetic flux density information, the voltage information, and the current information;

[0047] Determining target operating condition information of the converter transformer to be analyzed according to the corresponding relationship;

[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, comprising a computer program, which, when executed by a processor, implements the following steps:

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

[0053] Establishing a correspondence between the magnetic flux density information, the voltage information, and the current information;

[0054] Determining target operating condition information of the converter transformer to be analyzed according to the corresponding relationship;

[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 correspondence between the magnetic flux density information, voltage information and current information. Then, based on the correspondence, the target operating condition information of the converter transformer to be analyzed is determined. Then, a 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, 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 problem that when an excitation inrush current occurs in the converter transformer, the judgment method based on the current and voltage detection signals is prone to errors, 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 following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. 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 any creative work.

[0060] Figure 1 1 is a flow chart of a converter transformer protection method according to an embodiment;

[0061] Figure 2 1 is a flow chart of a converter transformer protection method according to another embodiment;

[0062] Figure 3 1 is a flow chart of a method for optimizing a converter transformer relay protection device based on flux braking in one embodiment;

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

[0064] Figure 5A schematic diagram of the optimized action area and braking area division of the relay protection device in an embodiment;

[0065] Figure 6 A structure block diagram of the converter transformer protection device in an embodiment;

[0066] Figure 7 An internal structure diagram of the computer device in an embodiment. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not 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 for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0069] In an exemplary embodiment, as shown in Figure 1 A converter transformer protection method is provided, and the present embodiment takes the method applied to a server as an example; 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 realized through the interaction between the terminal and the server. The terminal can be, but is not limited to, various personal computers, notebook computers, smart phones and tablet computers; the server can be realized by an independent server or a server cluster composed of multiple servers. In the present embodiment, the method includes the following steps:

[0070] In step S101, the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed are acquired.

[0071] The converter transformer to be analyzed refers to the converter transformer that needs to be protected and processed.

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

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

[0074] The current information is used to represent the current value changing 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 magnetic flux density sensor, voltage transformer and current transformer corresponding to the converter transformer to be analyzed; then, the server collects the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed through the magnetic flux density sensor, voltage transformer and current transformer corresponding to the converter transformer to be analyzed.

[0076] Step S102: constructing a correspondence between magnetic flux density information, voltage information, and current information.

[0077] The corresponding relationship is used to represent the association 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 preprocessed magnetic flux density information, preprocessed voltage information and preprocessed current information of the converter transformer to be analyzed; then, the server constructs a correspondence 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 magnetic flux density information, voltage information, and 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 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 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 a 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: Control the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information.

[0093] For example, 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 converter transformer protection method, the magnetic flux density information, the voltage information and the current information of the converter transformer to be analyzed are acquired first, and a corresponding relationship among the magnetic flux density information, the voltage information and the current information is constructed, then the target working condition information of the converter transformer to be analyzed is determined according to the corresponding relationship, next, the preset magnetic flux density threshold corresponding to the target working condition information is determined, then the target instruction information of the relay protection device associated with the converter transformer to be analyzed is determined according to the difference between the magnetic flux density information and the preset magnetic flux density threshold, and finally, the relay protection device is controlled to perform protection processing on the converter transformer to be analyzed according to the target instruction information. In this way, when the converter transformer is protected, the corresponding relationship among the magnetic flux density information, the voltage information and the 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 the determination accuracy of the target instruction information can be improved, so that the relay protection device connected with the converter transformer can more accurately protect the converter transformer, and the stability of the operation of the converter transformer is improved. Moreover, the method avoids the defect that the detection signal based on the current and the voltage is prone to error in the case of the excitation inrush current of the converter transformer, which causes the relay protection device connected with the converter transformer to trigger a false action, and further improves the stability of the operation of the converter transformer.

[0095] In one exemplary embodiment, before the target working condition information of the converter transformer to be analyzed is determined according to the corresponding relationship in the step S103, the step S103 specifically includes the following contents: acquiring inductance information of the converter transformer to be analyzed; constructing a target corresponding relationship among the magnetic flux density information, the voltage information, the current information and the inductance information; and updating the corresponding relationship to the target corresponding relationship.

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

[0097] The inductance information is used to represent the inductance value changing with time in the converter transformer to be analyzed.

[0098] The target corresponding relationship is used to represent the association 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 between the magnetic flux density information, voltage information, current information and inductance information, and updates the correspondence between the magnetic flux density information, voltage information and current information to the target correspondence; then, the server classifies the target correspondence to obtain the operating condition information that matches the target correspondence as the target operating condition information of the converter transformer to be analyzed.

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

[0101] in, 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 conducive 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-mentioned 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, specifically including 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 pre-set magnetic flux change rate threshold used to determine 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 magnetic 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. Compared with judging based on only a single parameter, this method can more comprehensively reflect the operating status of the converter transformer and reduce the possibility of misjudgment and missed judgment.

[0108] In an exemplary embodiment, the above step S103 determines the target operating condition information of the converter transformer to be analyzed based on the corresponding relationship, which specifically includes the following contents: determining the flux characteristic information of the converter transformer to be analyzed based on the corresponding relationship; and using 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 magnetic flux characteristic information of the converter transformer to be analyzed is determined through precise correspondence, 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-mentioned 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-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, 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 the 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 a 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 predicted 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 selects the candidate magnetic flux density threshold with the largest predicted 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-mentioned 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; from each candidate converter transformer, screening out the candidate converter transformers whose voltage level information and application scenario information both meet the preset conditions as the converter transformer to be analyzed.

[0119] 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 a use environment of the candidate converter transformer, and includes altitude information and temperature difference information.

[0121] The preset condition refers to a pre-set judgment condition, and is used for judging the voltage level information and the application scenario information of the candidate converter transformer.

[0122] For example, the server filters, from the candidate converter transformers, the candidate converter transformer whose voltage level information is extra-high voltage, whose altitude information is within a preset altitude threshold, and whose temperature difference information is within a preset temperature difference threshold, as the converter transformer to be analyzed.

[0123] In this embodiment, by simultaneously considering the voltage level information and the application scenario information of the candidate converter transformer, the converter transformer meeting the actual demand can be more accurately filtered from multiple dimensions, and the determination accuracy of the converter transformer to be analyzed is improved.

[0124] In one example embodiment, as shown in Figure 2 Another converter transformer protection method is provided, which is applied to a server as an example and includes the following steps.

[0125] In step S201, voltage level information and application scenario information of a candidate converter transformer are obtained.

[0126] In step S202, the candidate converter transformer whose voltage level information and application scenario information both meet preset conditions is filtered from the candidate converter transformers, as the converter transformer to be analyzed.

[0127] In step S203, a corresponding relationship among the magnetic flux density information, the voltage information, and the current information is constructed.

[0128] In step S204, the magnetic flux characteristic information of the converter transformer to be analyzed is determined according to the corresponding relationship.

[0129] In step S205, the working condition information corresponding to the magnetic flux characteristic information is taken as the target working condition information.

[0130] In step S206, the target working condition information is input into a pre-constructed magnetic flux density threshold prediction model, to obtain a plurality of candidate magnetic flux density thresholds corresponding to the target working condition information, and a prediction probability corresponding to each candidate magnetic flux density threshold.

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

[0134] Step S210: Control the relay protection device to perform protection processing on the converter transformer to be analyzed according to the target instruction information.

[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 based on 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 problem that when an excitation inrush current occurs in the converter transformer, the judgment method based on the current and voltage detection signals is prone to errors, 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.

[0136] In an exemplary embodiment, in order to more clearly illustrate the converter transformer protection method provided by the embodiment of the present application, the converter transformer protection method is specifically described below using a specific embodiment. In one 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 a converter transformer, the magnetic flux density information, voltage information, and current information of the converter transformer to be analyzed are first obtained, and a correspondence between the magnetic flux density information, voltage information, and current information is established. Then, based on the correspondence, the target operating condition information of the converter transformer to be analyzed is determined. Then, a 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. 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 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 of the magnetic flux , the corrected magnetic flux calculation formula is:

[0143] , formula (2)

[0144] in, It is the flux-dependent inductance, which shows how the inductance value changes with the 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 magnetic 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 magnetic flux characteristics of each working condition.

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

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

[0151] , formula (3)

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

[0153] The magnetic flux change during the closing excitation inrush is a nonlinear characteristic, represented as:

[0154] Equation (4)

[0155] Where, 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] Equation (5)

[0158] Where, , , are the magnetic flux density, voltage, and current at the fault time, respectively, is the fault resistance.

[0159] Characteristic Summary: The magnetic flux characteristics of the three conditions are summarized, laying the foundation for setting thresholds in the subsequent.

[0160] 3. According to the threshold, the braking area and the action area are determined:

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

[0162] When the magnetic flux meets or , the system enters the action area, and the relay protection device starts the protection action to prevent damage caused by faults or abnormal inrush current.

[0163] Conversely, if the magnetic flux does not exceed and is less than , the system will enter the braking area and continue to monitor without triggering tripping.

[0164] Dynamic protection mechanism: At each magnetic flux data update, 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 ability to optimize threshold settings and adjustments.

[0165] In the above embodiment, when protecting a converter transformer, a correspondence is established between the magnetic flux density information, voltage information, and current information of the converter transformer to be analyzed. Based on this correspondence, the operating condition of the converter transformer can be accurately determined, thereby accurately obtaining the corresponding preset magnetic flux density threshold. This can further improve the accuracy of determining the target instruction information, thereby enabling the relay protection device connected to the converter transformer to more accurately protect the converter transformer, which is beneficial for improving the stability of the converter transformer operation. Moreover, this method avoids the defect that when a magnetizing inrush current occurs in the converter transformer, judgment based on current and voltage detection signals is prone to errors, which can lead to malfunction of the relay protection device connected to the converter transformer, thereby causing low stability in the operation of the converter transformer. Furthermore, this method further improves the stability of the converter transformer operation. Furthermore, by introducing the principle of magnetic flux braking, this solution can effectively distinguish between normal operating conditions, magnetizing inrush current, and fault conditions based on the nonlinear mapping relationship between magnetic flux density, voltage, and current. Compared to traditional current- and voltage-based relay protection devices, this approach significantly improves the protection device's identification accuracy, particularly reducing false tripping caused by magnetizing inrush current, ensuring system reliability under complex operating conditions. This solution sets different braking and operating thresholds based on the magnetic flux characteristics under different operating conditions, specifically introducing a time-decay threshold adjustment method for magnetizing inrush current. By dynamically adjusting the braking threshold, the relay protection device can more intelligently respond to transient changes, avoiding the limitations of traditional fixed thresholds and improving the real-time and flexibility of protection actions. This solution is applicable to various complex power operating conditions, especially in the face of abnormal conditions such as transformer short-circuit faults and magnetizing inrush current. Through more detailed magnetic flux characteristic analysis and precise protection action judgment, it effectively ensures the safe and stable operation of the power system. This solution proposes a dynamic protection mechanism based on real-time monitoring of magnetic flux density, which automatically adjusts the braking and operating zones with each flux data update. Furthermore, the system has self-learning capabilities, continuously optimizing threshold settings based on operating conditions, making the relay protection device more adaptable. By precisely dividing the braking zone and the action zone, this solution can quickly initiate protection actions when the system is in abnormal operating conditions, 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 various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed 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 portion of steps or stages in other steps.

[0167] Based on the same inventive concept, embodiments of the present application further provide a converter transformer protection device for implementing the aforementioned converter transformer protection method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more converter transformer protection device embodiments provided below can be found in the above-described limitations of the converter transformer protection method and are not further elaborated here.

[0168] In an exemplary embodiment, Figure 6 As shown, a converter transformer protection device is provided, comprising: an information acquisition module 601, a relationship construction module 602, an operating 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 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 for obtaining the inductance information of the converter transformer to be analyzed; constructing a target correspondence between the magnetic flux density information, voltage information, current information and inductance information; updating the correspondence to a target correspondence; and an operating condition determination module 603 for determining the target operating condition information of the converter transformer to be analyzed based on the target correspondence.

[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; and to determine the target instruction information of the relay protection device associated with the converter transformer to be analyzed 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.

[0177] In an exemplary embodiment, the operating condition determination module 603 is further configured 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 for obtaining 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 both meet preset conditions is screened out as the converter transformer to be analyzed.

[0180] Each module in the converter transformer protection device described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of 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 in the figure. 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 the 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 capability. 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 magnetic flux density information, voltage information, current information and other data. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with the terminal outside through the network connection. The computer program is executed by the processor to realize a converter transformer protection method.

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

[0183] In an exemplary embodiment, a computer device is also provided, including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to realize the steps in each of the above method embodiments.

[0184] In an exemplary embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to realize the steps in each of the above method embodiments.

[0185] In an exemplary embodiment, a computer program product is provided, including a computer program, and the computer program is executed by a processor to realize the steps in each of the above method embodiments.

[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. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present 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 storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric 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 but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0187] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0188] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended 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; Establishing a correspondence between the magnetic flux density information, the voltage information, and the current information; Determining target operating condition information of the converter transformer to be analyzed according to the corresponding relationship; 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; screening out the candidate magnetic flux density threshold with the highest prediction probability from the candidate magnetic flux density thresholds as the preset magnetic flux density threshold corresponding to the target operating condition information; 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 based on the magnetic flux density information; and determining target instruction information of a relay protection device associated with the converter transformer to be analyzed based on a difference between the magnetic flux density information and the preset magnetic flux density threshold, and a difference between the magnetic flux change rate and the preset magnetic flux change rate 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; Establishing 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 target operating condition information of the converter transformer to be analyzed based on the corresponding relationship includes: According to the target corresponding relationship, target operating condition information of the converter transformer to be analyzed is determined.

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

4. The method according to any one of claims 1 to 3, characterized in that Before obtaining the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed, the following steps are also included: Obtain 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.

5. A converter transformer protection device, characterized in that: The device comprises: An information acquisition module is used to obtain the magnetic flux density information, voltage information and current information of the converter transformer to be analyzed; a relationship building module, configured to build a corresponding relationship among the magnetic flux density information, the voltage information, and the current information; an operating condition determination module, configured to determine target operating condition information of the converter transformer to be analyzed based on the corresponding relationship; a threshold determination module, configured to input the target operating condition information into a pre-established magnetic flux density threshold prediction model, 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; and select, from the candidate magnetic flux density thresholds, the candidate magnetic flux density threshold with the greatest prediction probability as the preset magnetic flux density threshold corresponding to the target operating condition information; an instruction determination module, configured to 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 based on the magnetic flux density information; and determine target instruction information for a relay protection device associated with the converter transformer to be analyzed based on a difference between the magnetic flux density information and the preset magnetic flux density threshold, and a difference between the magnetic flux change rate and the preset magnetic flux change rate 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.

6. The device according to claim 5, characterized in that The device also includes a relationship updating module, which is used to obtain the inductance information of the converter transformer to be analyzed; establish a target correspondence between the magnetic flux density information, the voltage information, the current information and the inductance information; and update the correspondence to the target correspondence; the operating condition determination module is also used to determine the target operating condition information of the converter transformer to be analyzed based on the target correspondence.

7. The device according to claim 5, characterized in that The operating condition determination module is further configured to determine the magnetic flux characteristic information of the converter transformer to be analyzed based on the corresponding relationship; and use the operating condition information corresponding to the magnetic flux characteristic information as the target operating condition 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 4 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 4 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 4 are implemented.

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