Monitoring method, device and equipment for grounding resistance in low-voltage transformer area in power grid, storage medium and program product

Abstract

The embodiment of the invention provides a monitoring method, device and equipment for grounding resistance in a low-voltage transformer area in a power grid, a storage medium and a program product. The method comprises the following steps: acquiring a first resistance value and an environment parameter of a grounding resistor in a low-voltage transformer area in a power grid at a historical moment; for the grounding resistor in the low-voltage transformer area, based on the first resistance values of other grounding resistors in the low-voltage transformer area at the historical moment, performing optimization processing on the first resistance value of the grounding resistor in the low-voltage transformer area at the historical moment to obtain a target resistance value of the grounding resistor in the low-voltage transformer area at the historical moment; determining and displaying monitoring information of the grounding resistor in the low-voltage transformer area according to the target resistance value of the grounding resistor in the low-voltage transformer area at the historical moment and the environmental parameters; wherein the monitoring information represents whether the grounding resistor has a fault or not. The method is used for improving the fault monitoring accuracy of the grounding resistor in the low-voltage transformer area in the power grid.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to a method, apparatus, equipment, storage medium, and program product for monitoring the grounding resistance in low-voltage distribution areas of a power grid. Background Technology

[0002] In power systems, monitoring the grounding resistance in low-voltage distribution areas to obtain fault information is a crucial step in ensuring the safe operation of the power grid.

[0003] In related technologies, the grounding resistance value is measured, and the measured resistance values ​​of each grounding resistance are analyzed and processed to obtain the monitoring results. However, the measured resistance value of grounding resistance in low-voltage distribution areas is easily affected by other grounding resistances and environmental changes. Therefore, the related technologies suffer from inaccurate monitoring results for grounding resistance.

[0004] Therefore, improving the accuracy of grounding resistance monitoring results in low-voltage distribution areas of the power grid has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a method, apparatus, equipment, storage medium, and program product for monitoring grounding resistance in low-voltage distribution areas of a power grid, in order to improve the accuracy of monitoring results for grounding resistance in low-voltage distribution areas of a power grid.

[0006] In a first aspect, embodiments of this application provide a method for monitoring the grounding resistance in a low-voltage distribution area of ​​a power grid, comprising:

[0007] Obtain the first resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area of ​​the power grid at a historical time.

[0008] For the grounding resistance in the low-voltage distribution area, based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, the first resistance value of the grounding resistance in the low-voltage distribution area at a historical time is optimized to eliminate the influence of the other grounding resistances on the first resistance value of the grounding resistance, so as to obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time.

[0009] Based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times, the monitoring information of the grounding resistance in the low-voltage distribution area is determined and displayed; wherein, the monitoring information indicates whether the grounding resistance has failed.

[0010] In one possible implementation, for the grounding resistance in the low-voltage distribution area, based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, the first resistance value of the grounding resistance in the low-voltage distribution area at a historical time is optimized to obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time, including:

[0011] For each grounding resistor, repeat the following steps until the preset conditions are met:

[0012] Based on the second resistance value of each of the other grounding resistors at a historical time, an adjustment resistance value for each grounding resistor at a historical time is generated; wherein, the initial value of the second resistance value is the first resistance value;

[0013] The second resistance value of each grounding resistor at a historical time is updated based on the second resistance value, the adjustment resistance value, and the first resistance value of each grounding resistor at a historical time.

[0014] Specifically, when the preset conditions are met, the second resistance value of each grounding resistor at a historical time is determined as the target resistance value of each grounding resistor at that historical time.

[0015] In one possible implementation, for each grounding resistor, an adjustment resistance value for each grounding resistor at a historical time is generated based on the second resistance value of each of the other grounding resistors at a historical time, including:

[0016] For each grounding resistor, the derivatives of the second resistance values ​​of the other grounding resistors at historical times are summed to obtain the adjustment resistance value of each grounding resistor at historical times.

[0017] In one possible implementation, the updated second resistance value for each grounding resistor is:

[0018] ;

[0019] in, This represents the updated second resistance value of the i-th grounding resistance at the historical time after the k-th update operation; This represents the first resistance value of the i-th grounding resistor at a historical moment; This represents the adjusted resistance value of the i-th grounding resistor at the historical time during the k-th update operation; This represents the second resistance value of the i-th grounding resistor at a historical time during the k-th update operation.

[0020] In one possible implementation, based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at a historical time, the monitoring information of the grounding resistance in the low-voltage distribution area at a historical time is determined and displayed, including:

[0021] For each of the grounding resistors, the environmental difference of the grounding resistor at adjacent times is obtained based on the difference in the values ​​of the environmental parameters of the grounding resistor at adjacent times.

[0022] For each of the grounding resistors, if it is determined that the target resistance value of the grounding resistor is greater than a preset resistance threshold in consecutive adjacent time periods, and it is determined that the environmental difference value of the grounding resistor is less than a preset environmental difference threshold in consecutive adjacent time periods, then it is determined that the monitoring information of the grounding resistor indicates that the grounding resistor has a fault.

[0023] In one possible implementation, the method further includes:

[0024] Based on a preset regression model, the first resistance value of the grounding resistor at the current moment and environmental parameters are processed to predict the first resistance value of the grounding resistor at a future moment.

[0025] In one possible implementation, the method further includes:

[0026] Based on the environmental parameters of the grounding resistance at each historical moment, a regression model is established to show how the resistance influence value of the grounding resistance changes with the environmental parameters; wherein, the resistance influence value represents the resistance difference of the grounding resistance between any two adjacent historical moments due to environmental influence.

[0027] Based on a preset objective function, the regression model is optimized by adjusting the parameters of the grounding resistance at each historical moment according to the environmental parameters of the grounding resistance at each historical moment, thereby obtaining the preset regression model; wherein, the objective function is used to minimize the sum of the resistance influence values ​​of the grounding resistance at multiple historical moments.

[0028] In one possible implementation, the environmental parameters include at least one of the following:

[0029] Information on the temperature, humidity, and electromagnetic interference of the environment in which the grounding resistance is located.

[0030] Secondly, embodiments of this application provide a monitoring device for grounding resistance in low-voltage distribution areas of a power grid, comprising:

[0031] The acquisition module is used to acquire the first resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area of ​​the power grid at a historical time.

[0032] The optimization module is used to optimize the first resistance value of the grounding resistance in the low-voltage distribution area based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, so as to eliminate the influence of the other grounding resistances on the first resistance value of the grounding resistance, and obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time.

[0033] The monitoring module is used to determine and display the monitoring information of the grounding resistance in the low-voltage distribution area based on the target resistance value and environmental parameters at historical times; wherein the monitoring information indicates whether the grounding resistance has failed.

[0034] Thirdly, embodiments of this application provide a monitoring device for grounding resistance in low-voltage distribution areas of a power grid, comprising: a memory and a processor;

[0035] The memory stores computer-executed instructions;

[0036] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0037] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0038] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0039] The method, apparatus, equipment, storage medium, and program product for monitoring grounding resistance in low-voltage distribution areas of the power grid provided in this application embodiment acquire the resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times; optimize the grounding resistance in the low-voltage distribution area based on the resistance values ​​of other grounding resistances in the low-voltage distribution area at historical times to obtain an optimized target resistance value; determine monitoring information characterizing whether a fault has occurred in the grounding resistance based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times; and improve the accuracy of the monitoring results of grounding resistance in low-voltage distribution areas of the power grid by considering the influence of the resistance values ​​of other grounding resistances in the low-voltage distribution area on the resistance value of the grounding resistance in the low-voltage distribution area, and by considering the influence of changes in the environment on the resistance value of the grounding resistance. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0041] Figure 1 A schematic diagram illustrating a scenario for a method of monitoring grounding resistance in a low-voltage distribution area of ​​a power grid, as provided in an embodiment of this application.

[0042] Figure 2 A flowchart illustrating the method for monitoring grounding resistance in low-voltage distribution areas of a power grid, as provided in this application embodiment;

[0043] Figure 3 A schematic diagram of the structure of a monitoring device for grounding resistance in a low-voltage distribution area of ​​a power grid provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the structure of a monitoring device for grounding resistance in a low-voltage distribution area of ​​a power grid, provided in an embodiment of this application.

[0045] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0047] Figure 1 This is a schematic diagram illustrating a scenario for a method of monitoring grounding resistance in a low-voltage distribution area of ​​a power grid, as provided in an embodiment of this application. Figure 1 As shown, for the grounding resistance 10 in the low-voltage distribution area of ​​the power grid, the monitoring equipment 11 is used to monitor the change of the resistance value of the grounding resistance 10 in the low-voltage distribution area; the analysis system performs fault analysis on the monitoring data so as to maintain the grounding resistance 10 in the low-voltage distribution area according to the fault analysis results, thereby ensuring the safe and stable operation of the power grid.

[0048] Regarding the monitoring and fault analysis of grounding resistance 10 in low-voltage distribution areas, related technologies involve measuring the resistance value of each grounding resistance and analyzing the measured resistance values ​​to obtain the monitoring results. However, the measured resistance value of grounding in low-voltage distribution areas is easily affected by other grounding resistances and environmental changes.

[0049] Based on the above scenarios, it can be seen that the relevant technologies have a technical problem of inaccurate monitoring results of grounding resistance.

[0050] The method, apparatus, equipment, storage medium, and program products for monitoring grounding resistance in low-voltage distribution areas of the power grid provided in this application are intended to solve the above-mentioned technical problems.

[0051] The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0052] Figure 2 The flowchart illustrates the method for monitoring grounding resistance in low-voltage distribution areas of the power grid provided in this application. Figure 2 As shown, the method includes:

[0053] S21. Obtain the first resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area of ​​the power grid at a historical time.

[0054] It should be noted that various sensors can be installed in the low-voltage distribution area to collect the resistance value of the grounding resistor and environmental parameters in real time. Since the resistance value of the grounding resistor in the low-voltage distribution area is easily affected by the temperature, humidity, and electromagnetic interference of the surrounding environment, in some specific embodiments, the environmental parameters include at least one of the following: the temperature, humidity, and electromagnetic interference information of the environment where the grounding resistor is located.

[0055] In these implementations, by acquiring information on the temperature, humidity, and electromagnetic interference of the environment in which the grounding resistor is located in the low-voltage distribution area, the influence of the environment on the resistance value of the grounding resistor can be fully considered, so as to optimize the resistance value of the grounding resistor and obtain a more accurate resistance value.

[0056] For example, high-precision resistance sensors can be installed at critical grounding points in low-voltage distribution areas to collect the resistance value of the grounding resistor. Specifically, based on the four-wire measurement principle, a stable excitation current can be provided to the grounding resistor through an independent power supply circuit (this independent power supply circuit adopts a constant current source design to provide a reliable excitation signal for the measurement of the grounding resistance value), and the resistance sensor can be used to collect the current and voltage values ​​of the grounding resistor. Simultaneously, the resistance sensor can have a built-in microprocessor to perform preprocessing on the collected voltage signal, including filtering, amplification, digitization, and noise removal, and calculate and output the resistance value of the grounding resistor based on the collected current and voltage values.

[0057] For example, environmental monitoring sensors can be installed at key locations within the low-voltage distribution area to collect information on the temperature, humidity, and electromagnetic interference of the environment in which the grounding resistor is located.

[0058] S22. For the grounding resistance in the low-voltage distribution area, based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, optimize the first resistance value of the grounding resistance in the low-voltage distribution area at a historical time to eliminate the influence of other grounding resistances on the first resistance value of the grounding resistance, and obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time.

[0059] It should be noted that the cloud computing platform within the monitoring system can be used to analyze the collected grounding resistance data from the low-voltage distribution area. The collected grounding resistance values ​​and environmental parameters from the low-voltage distribution area can be transmitted wirelessly to the cloud computing platform within the monitoring system.

[0060] The grounding resistance in a low-voltage distribution area is affected not only by the environment but also by the resistance values ​​of other grounding resistors connected in parallel with the grounding resistance in the low-voltage distribution area. Therefore, the first resistance value of each of the other grounding resistors in the low-voltage distribution area at a historical time can be used to optimize the first resistance value of the grounding resistance in the low-voltage distribution area at a historical time, thereby eliminating the influence of other grounding resistors on the resistance value of the grounding resistance.

[0061] In some implementations of these embodiments, the optimization operation in step S22 may include the following sub-steps:

[0062] For each grounding resistor, repeat the following steps until the preset conditions are met:

[0063] First, based on the second resistance values ​​of each of the other grounding resistors at historical time, generate the adjustment resistance value of each grounding resistor at historical time; wherein, the initial value of the second resistance value is the first resistance value;

[0064] Second, based on the second resistance value, adjustment resistance value, and first resistance value of each grounding resistor at a historical time, the second resistance value of each grounding resistor at a historical time is updated.

[0065] Specifically, when the preset conditions are met, the second resistance value of each grounding resistor at a historical time is determined, which is the target resistance value of each grounding resistor at that historical time.

[0066] For the first step described above, for each grounding resistor, based on the second resistance value of each of the other grounding resistors at a historical time, an adjustment resistance value for each grounding resistor at a historical time is generated, including:

[0067] For each grounding resistor, the derivatives of the second resistance values ​​of the other grounding resistors at historical times are summed to obtain the adjustment resistance value of each grounding resistor at historical times.

[0068] For example, the adjustment resistance value of each grounding resistance at a historical time can be obtained by the following formula (1):

[0069] (1);

[0070] In the formula, This represents the adjusted resistance value of the i-th grounding resistance at the historical time during the k-th update operation; N represents the total number of grounding resistances in the low-voltage distribution area. This represents the second resistance value of the j-th grounding resistance at the historical time during the k-th update operation.

[0071] For the second step above, the updated second resistance value for each grounding resistor is:

[0072] ;

[0073] in, This represents the updated second resistance value of the i-th grounding resistance at the historical time after the k-th update operation; This represents the first resistance value of the i-th grounding resistor at a historical moment; This represents the adjusted resistance value of the i-th grounding resistor at the historical time during the k-th update operation; This represents the second resistance value of the i-th grounding resistance at a historical time during the k-th update operation.

[0074] As an example, for each grounding resistor, the preset condition could be that the number of times the update operation is performed reaches a preset threshold.

[0075] As another example, for each grounding resistance, the preset conditions can be determined using the following formula (2):

[0076] (2);

[0077] In the formula, max represents the maximum value function; This represents the threshold value representing the difference between the updated second resistance value of the i-th grounding resistance at a historical time after the k-th update operation and the second resistance value of the i-th grounding resistance at a historical time during the k-th update operation. Specifically, It equals 0.001.

[0078] In these implementations, for each grounding resistor, the resistance value of the grounding resistor is optimized using the historical resistance values ​​of other grounding resistors in the low-voltage distribution area. That is, by iteratively solving the problem, the influence of other grounding resistors on the resistance value of the grounding resistor is gradually reduced, thereby accurately eliminating the influence of other grounding resistors in the low-voltage distribution area on the resistance value of the grounding resistor, thus improving the accuracy of the resistance value of the grounding resistor.

[0079] S23. Based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times, determine and display the monitoring information of the grounding resistance in the low-voltage distribution area; wherein, the monitoring information indicates whether the grounding resistance has a fault.

[0080] It should be noted that the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times can be stored in the data storage module of the monitoring system's cloud computing platform. This data storage module can use a distributed file system to classify and store the resistance values, environmental parameters, and historical data of the grounding resistance acquired in the low-voltage distribution area.

[0081] Grounding resistance faults can include persistent faults and temporary disturbances. For any grounding resistor, if its resistance value exceeds the normal range at a historical time, accompanied by a sudden change in environmental parameters, then the grounding resistance is considered to be experiencing a temporary disturbance. If the grounding resistance value exceeds the normal range for multiple consecutive historical times, and the environmental parameters are normal, then the grounding resistance is determined to have a persistent fault.

[0082] For persistent faults, in some implementations of these embodiments, S23 includes the following sub-steps:

[0083] For each grounding resistance, the environmental difference between adjacent times is obtained based on the difference in the values ​​of the environmental parameters of the grounding resistance at adjacent times.

[0084] For each grounding resistor, if the target resistance value of the grounding resistor is determined to be greater than the preset resistance threshold in consecutive adjacent time periods, and the environmental difference value of the grounding resistor is determined to be less than the preset environmental difference threshold in consecutive adjacent time periods, then the monitoring information of the grounding resistor indicates that a fault has occurred in the grounding resistor.

[0085] For example, the resistance value of the grounding resistor is usually between 0 ohms and 10 ohms. If the monitoring system detects that the resistance value of the grounding resistor is greater than 10 ohms for four consecutive historical moments, and the temperature difference, humidity difference, and magnetic field interference intensity difference between any two adjacent historical moments are less than a preset temperature difference threshold, a preset humidity difference threshold, and a preset magnetic field interference intensity difference threshold, then it can be determined that the grounding resistor has a continuous fault; otherwise, it is determined that the grounding resistor has no continuous fault.

[0086] In these implementations, the monitoring information of grounding resistance is determined by analyzing the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times. The influence of environmental parameters on the resistance value of grounding resistance is considered, rather than simply considering the fluctuation of the resistance value, thereby making the monitoring results more accurate.

[0087] In some implementations of these embodiments, the above method further includes: processing the first resistance value of the grounding resistance at the current moment and environmental parameters based on a preset regression model to predict the first resistance value of the grounding resistance at a future moment.

[0088] Specifically, for the preset regression model, based on the environmental parameters of the grounding resistance at each historical moment, a regression model is established to show how the resistance influence value of the grounding resistance changes with the environmental parameters; where the resistance influence value represents the resistance difference of the grounding resistance between any two adjacent historical moments due to environmental influence.

[0089] Based on the preset objective function, the regression model is optimized by adjusting the parameters according to the environmental parameters of the grounding resistance at each historical moment to obtain the preset regression model; wherein, the objective function is used to minimize the sum of the resistance influence values ​​of the grounding resistance at multiple historical moments.

[0090] For example, for each grounding resistance, the established regression model can be expressed by the following formula (3):

[0091] (3);

[0092] In the formula, This represents the resistance difference between the grounding resistance i at times t-1 and t due to environmental influences. This represents the difference in temperature parameters between the grounding resistance i at times t-1 and t. This represents the difference in humidity parameters between the grounding resistance i at times t-1 and t. This represents the difference in magnetic field interference intensity between the grounding resistance i at times t-1 and t. Regression coefficients representing the differences in temperature parameters; Regression coefficients representing the differences in humidity parameters; The regression coefficient represents the difference in electromagnetic interference intensity parameters.

[0093] For the regression model corresponding to the grounding resistance i, the objective function of the regression model can be expressed by the following formula (4):

[0094] (4);

[0095] In the formula, min represents the minimization function; T represents the total number of historical moments; This represents the difference in grounding resistance i between times t-2 and t-1 due to environmental influences.

[0096] In these implementations, a regression model is established to show how the resistance value of the grounding resistance changes with environmental parameters. The parameters of the regression model are then optimized according to the objective function. The resulting preset regression model is used to predict the resistance value of the grounding resistance at future times, thereby determining whether the grounding resistance may fail in the future. This allows for the timely detection of potential fault signals and the implementation of measures to reduce the impact of the fault.

[0097] The method for monitoring grounding resistance in low-voltage distribution areas of a power grid provided in this application embodiment obtains the resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times; optimizes the grounding resistance in the low-voltage distribution area based on the resistance values ​​of other grounding resistances in the low-voltage distribution area at historical times to obtain an optimized target resistance value; and determines monitoring information characterizing whether a fault has occurred in the grounding resistance based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area. Because the method considers the influence of the resistance values ​​of other grounding resistances in the low-voltage distribution area on the resistance value of the grounding resistance in the low-voltage distribution area, and also considers the influence of changes in the environment on the resistance value of the grounding resistance, the accuracy of the monitoring results of grounding resistance in low-voltage distribution areas of the power grid is improved.

[0098] Figure 3 A schematic diagram of the structure of the monitoring device for grounding resistance in low-voltage distribution areas of the power grid provided in this application is shown below. Figure 3 As shown, the grounding resistance monitoring device 30 in the low-voltage distribution area of ​​the power grid provided in this embodiment includes:

[0099] The acquisition module 301 is used to acquire the first resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area of ​​the power grid at a historical time.

[0100] The optimization module 302 is used to optimize the first resistance value of the grounding resistance in the low-voltage distribution area based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, so as to eliminate the influence of other grounding resistances on the resistance value of the grounding resistance, and obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time.

[0101] The monitoring module 303 is used to determine and display the monitoring information of the grounding resistance in the low-voltage distribution area based on the target resistance value and environmental parameters at historical times; wherein, the monitoring information indicates whether the grounding resistance has a fault.

[0102] In one possible implementation, the optimization module 302 is further configured to repeat the following steps for each grounding resistor until a preset condition is met:

[0103] Based on the second resistance values ​​of each of the other grounding resistors at historical time, an adjustment resistance value for each grounding resistor at historical time is generated; wherein, the initial value of the second resistance value is the first resistance value;

[0104] For each grounding resistor, the second resistance value of each grounding resistor at the historical time is updated based on the second resistance value, the adjustment resistance value, and the first resistance value at the historical time.

[0105] Specifically, when the preset conditions are met, the second resistance value of each grounding resistor at a historical time is determined, which is the target resistance value of each grounding resistor at that historical time.

[0106] In one possible implementation, the optimization module 302 is further configured to sum the derivatives of the second resistance values ​​of each of the other grounding resistors at historical times for each grounding resistor, so as to obtain the adjustment resistance value of each grounding resistor at historical times.

[0107] In one possible implementation, the updated second resistance value for each grounding resistor is:

[0108] ;

[0109] in, This represents the updated second resistance value of the i-th grounding resistance at the historical time after the k-th update operation; This represents the first resistance value of the i-th grounding resistor at a historical moment; This represents the adjustment resistance value of the i-th grounding resistor at a historical moment; This represents the second resistance value of the i-th grounding resistor at the historical time during the k-th update operation.

[0110] In one possible implementation, the monitoring module 303 is further configured to, for each grounding resistor, obtain the resistance difference of the grounding resistor at adjacent time points based on the difference of the target resistance value of the grounding resistor at adjacent time points, and obtain the environmental difference of the grounding resistor at adjacent time points based on the difference of the values ​​of the environmental parameters of the grounding resistor at adjacent time points.

[0111] For each grounding resistor, if the resistance difference between consecutive adjacent moments is greater than a preset resistance difference threshold, and the environmental difference between consecutive adjacent moments is less than a preset environmental difference threshold, then the monitoring information of the grounding resistor indicates that a fault has occurred in the grounding resistor.

[0112] In one possible implementation, the grounding resistance monitoring device 30 in the low-voltage distribution area of ​​the power grid further includes a prediction module, which processes the first resistance value of the grounding resistance at the current moment and environmental parameters based on a preset regression model to predict the first resistance value of the grounding resistance at a future moment.

[0113] In one possible implementation, the prediction module is further configured to establish a regression model of the resistance influence value of the grounding resistance as the environmental parameters change at each historical moment, based on the environmental parameters of the grounding resistance at each historical moment; wherein the resistance influence value characterizes the resistance difference of the grounding resistance between any two adjacent historical moments due to environmental influence.

[0114] Based on the preset objective function, the regression model is optimized by adjusting the parameters according to the environmental parameters of the grounding resistance at each historical moment to obtain the preset regression model; wherein, the objective function is used to minimize the sum of the resistance influence values ​​of the grounding resistance at multiple historical moments.

[0115] In one possible implementation, the environmental parameters include at least one of the following:

[0116] Information on the temperature, humidity, and electromagnetic interference of the environment in which the grounding resistance is located.

[0117] The grounding resistance monitoring device in the low-voltage distribution area of ​​the power grid provided in this embodiment can perform the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0118] Figure 4 A schematic diagram of the structure of the monitoring equipment for grounding resistance in low-voltage distribution areas of the power grid provided in this application. (See attached diagram.) Figure 4As shown, the grounding resistance monitoring device 40 in a low-voltage distribution area of ​​the power grid provided in this embodiment includes at least one processor 401 and a memory 402. Optionally, the grounding resistance monitoring device 40 in the low-voltage distribution area of ​​the power grid further includes a communication component 403. The processor 401, memory 402, and communication component 403 are connected via a bus 404.

[0119] In a specific implementation, at least one processor 401 executes computer execution instructions stored in memory 402, causing at least one processor 401 to perform the above-described method.

[0120] The specific implementation process of processor 401 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0121] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0122] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0123] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0124] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0125] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0126] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0127] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0128] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0129] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0130] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0131] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0132] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0133] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for monitoring grounding resistance in low-voltage distribution areas of a power grid, characterized in that, include: Obtain the first resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area of ​​the power grid at a historical time. For the grounding resistance in the low-voltage distribution area, based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, the first resistance value of the grounding resistance in the low-voltage distribution area at a historical time is optimized to eliminate the influence of the other grounding resistances on the first resistance value of the grounding resistance, so as to obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time. Based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times, the monitoring information of the grounding resistance in the low-voltage distribution area is determined and displayed; wherein, the monitoring information indicates whether the grounding resistance has failed.

2. The method according to claim 1, characterized in that, Regarding the grounding resistance in the low-voltage distribution area, based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, the first resistance value of the grounding resistance in the low-voltage distribution area at a historical time is optimized to obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time, including: For each grounding resistor, repeat the following steps until the preset conditions are met: Based on the second resistance value of each of the other grounding resistors at a historical time, an adjustment resistance value for each grounding resistor at a historical time is generated; wherein, the initial value of the second resistance value is the first resistance value; The second resistance value of each grounding resistor at a historical time is updated based on the second resistance value, the adjustment resistance value, and the first resistance value of each grounding resistor at a historical time. Specifically, when the preset conditions are met, the second resistance value of each grounding resistor at a historical time is determined as the target resistance value of each grounding resistor at that historical time.

3. The method according to claim 2, characterized in that, For each grounding resistor, an adjustment resistance value for each grounding resistor at a historical time is generated based on the second resistance value of each of the other grounding resistors at a historical time, including: For each grounding resistor, the derivatives of the second resistance values ​​of the other grounding resistors at historical times are summed to obtain the adjustment resistance value of each grounding resistor at historical times.

4. The method according to claim 2, characterized in that, The updated second resistance value for each grounding resistor is: ； in, This represents the updated second resistance value of the i-th grounding resistance at the historical time after the k-th update operation; This represents the first resistance value of the i-th grounding resistor at a historical moment; This represents the adjustment resistance value of the i-th grounding resistor at the historical time during the k-th update operation; the... The second resistance value of the i-th grounding resistor at a historical time during the k-th update operation.

5. The method according to claim 1, characterized in that, Based on the target resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area at historical times, the monitoring information of the grounding resistance in the low-voltage distribution area at historical times is determined and displayed, including: For each of the grounding resistors, the environmental difference of the grounding resistor at adjacent times is obtained based on the difference in the values ​​of the environmental parameters of the grounding resistor at adjacent times. For each of the grounding resistors, if it is determined that the target resistance value of the grounding resistor is greater than a preset resistance threshold in consecutive adjacent time periods, and it is determined that the environmental difference value of the grounding resistor is less than a preset environmental difference threshold in consecutive adjacent time periods, then it is determined that the monitoring information of the grounding resistor indicates that the grounding resistor has a fault.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: Based on a preset regression model, the first resistance value of the grounding resistor at the current moment and environmental parameters are processed to predict the first resistance value of the grounding resistor at a future moment.

7. The method according to claim 6, characterized in that, The method further includes: Based on the environmental parameters of the grounding resistance at each historical moment, a regression model is established to show how the resistance influence value of the grounding resistance changes with the environmental parameters; wherein, the resistance influence value represents the resistance difference of the grounding resistance between any two adjacent historical moments due to environmental influence. Based on a preset objective function, the regression model is optimized by adjusting the parameters of the grounding resistance at each historical moment according to the environmental parameters of the grounding resistance at each historical moment, thereby obtaining the preset regression model; wherein, the objective function is used to minimize the sum of the resistance influence values ​​of the grounding resistance at multiple historical moments.

8. The method according to any one of claims 1-5, characterized in that, The environmental parameters include at least one of the following: Information on the temperature, humidity, and electromagnetic interference of the environment in which the grounding resistance is located.

9. A monitoring device for grounding resistance in a low-voltage distribution area of ​​a power grid, characterized in that, include: The acquisition module is used to acquire the first resistance value and environmental parameters of the grounding resistance in the low-voltage distribution area of ​​the power grid at a historical time. The optimization module is used to optimize the first resistance value of the grounding resistance in the low-voltage distribution area based on the first resistance value of each other grounding resistance in the low-voltage distribution area at a historical time, so as to eliminate the influence of the other grounding resistances on the first resistance value of the grounding resistance, and obtain the target resistance value of the grounding resistance in the low-voltage distribution area at a historical time. The monitoring module is used to determine and display the monitoring information of the grounding resistance in the low-voltage distribution area based on the target resistance value and environmental parameters at historical times; wherein the monitoring information indicates whether the grounding resistance has failed.

10. A monitoring device for grounding resistance in low-voltage distribution areas of a power grid, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-7.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-7.

12. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method described in any one of claims 1-7.

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