Method and system for measuring and calculating influence of transformer replacement on line loss of power grid

Abstract

The invention provides a method and system for measuring and calculating the influence of transformer replacement on power grid line loss, and relates to the technical field of power distribution, and the method comprises the steps: obtaining the data of the influence of transformer replacement on the power grid line loss, the data of the influence of transformer replacement on the power grid line loss comprising transformer data and power grid data; performing energy efficiency evaluation on the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer; based on the power grid simulation analysis model, combining the energy efficiency evaluation data of the transformer and the power grid data to obtain a power grid simulation result; and according to a power grid simulation result, extracting measurement and calculation data related to the influence of transformer replacement on the power grid line loss, performing loss reduction effect calculation according to the measurement and calculation data, and obtaining a measurement and calculation result of the influence of transformer replacement on the power grid line loss. According to the method, the energy efficiency factor of the transformer is considered when the influence of transformer replacement on the power grid line loss is calculated, and the calculation value of the influence of transformer replacement on the power grid line loss is accurately calculated in combination with power grid model simulation analysis software.

Description

Technical Field

[0001] The present invention relates to the field of power distribution technology, and in particular to a method and system for calculating the impact of transformer replacement on power grid line loss. Background Art

[0002] With the optimization of energy structure and the increasing demand for electricity, energy efficiency management and energy saving and consumption reduction of power grids have become important research directions in the power industry. Among them, as an important equipment in the power grid, the energy efficiency of the transformer directly affects the overall energy consumption and line loss of the power grid. Therefore, how to improve the energy efficiency of the transformer and reduce the line loss of the power grid has become a technical problem that needs to be solved urgently. In traditional power grid management, the energy efficiency evaluation and replacement decision of the transformer are often based on simple capacity matching and load rate analysis, lacking in-depth research on the relationship between transformer energy efficiency and power grid line loss. At the same time, due to the complexity and uncertainty of the power grid, accurate line loss calculation and optimization decision-making are also very difficult. In recent years, with the development of smart grid technology and the application of advanced technologies such as big data and artificial intelligence, the energy efficiency management and optimization decision-making capabilities of the power grid have been significantly improved. By real-time monitoring and analysis of the operation data of the power grid, the energy efficiency of the transformer and the line loss of the power grid can be accurately evaluated, providing a scientific basis for the replacement and optimization decision of the transformer.

[0003] The existing technology collects transformer operation data, calculates its energy efficiency index, and analyzes the impact of transformer replacement on grid line loss in combination with the topology and load conditions of the grid. However, when calculating the impact of transformer replacement on grid line loss in the above manner, there is a lack of in-depth research on the relationship between transformer energy efficiency and grid line loss; at the same time, due to the dynamic changes and uncertainty of the grid, it is impossible to accurately reflect the real-time status of the grid, and thus it is impossible to accurately obtain the calculated value of the impact of transformer replacement on grid line loss. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a method for measuring the impact of transformer replacement on power grid line loss, comprising:

[0005] Obtain data on the impact of transformer replacement on power grid line losses. The data on the impact of transformer replacement on power grid line losses includes transformer data and power grid data.

[0006] Performing energy efficiency evaluation on the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer;

[0007] Based on the power grid simulation analysis model, the power grid simulation results are obtained by combining the transformer energy efficiency evaluation data and power grid data;

[0008] According to the power grid simulation results, the measured data related to the impact of transformer replacement on power grid line losses are extracted, and the loss reduction effect is calculated based on the measured data to obtain the measured results of the impact of transformer replacement on power grid line losses.

[0009] Preferably, the transformer data includes parameter information of the transformer; the parameter information is used to reflect the performance characteristics and operating status of the transformer;

[0010] The parameter information includes one or more of the following: capacity, impedance, voltage ratio, iron loss, copper loss, and load rate.

[0011] Preferably, performing energy efficiency evaluation on the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer includes:

[0012] The working state parameters of the transformer are obtained through static measurement, and the energy efficiency evaluation data of the transformer is obtained according to the working state parameters and parameter information;

[0013] Alternatively, the response performance of the transformer is obtained through dynamic measurement, and energy efficiency evaluation data of the transformer is obtained based on the response performance and parameter information.

[0014] Preferably, based on the power grid simulation analysis model, combined with the energy efficiency evaluation data of the transformer and the power grid data, the power grid simulation results are obtained, including:

[0015] Combine the energy efficiency evaluation data of the transformer and the power grid data, and simulate the actual operation status of the power grid based on the power grid simulation analysis model;

[0016] In the power grid simulation analysis model, the transformer replacement process is simulated by adjusting the transformer parameter information to obtain the energy efficiency evaluation data after the transformer replacement;

[0017] The grid simulation results are obtained based on the actual operating status of the grid and the energy efficiency evaluation data after transformer replacement.

[0018] Preferably, based on the power grid simulation analysis model, simulating the actual operation state of the power grid includes:

[0019] The simulation time parameters are adjusted in the power grid simulation analysis model to simulate the dynamically changing operating state of the power grid.

[0020] Preferably, the loss reduction effect is calculated based on the measured data to obtain the measured results of the impact of transformer replacement on the power grid line loss, including:

[0021] Substituting the measured data into the pre-established loss reduction electric quantity calculation formula of the influence of transformer replacement on the line loss of the power grid to calculate the loss reduction effect, the measurement result of the influence of transformer replacement on the line loss of the power grid is obtained;

[0022] Among them, the calculation formula for the power loss reduction effect of transformer replacement on power grid line loss is as follows:

[0023] Δ(ΔA)={(P 01 -P 02 )+k 2 β 2 (P k1 -P k2 )+[(I 01 %S N1 -I 02 %S N2 )+k 2 β 2 (U k1 %S N1 -U k2 %S N2 )]K Q ×10 -2}T

[0024] Among them, Δ(ΔA) is the power loss reduction caused by transformer replacement on power grid line loss, P 01 is the no-load loss of the transformer before replacement, P 02 is the no-load loss of the transformer after replacement, P k1 is the rated load loss of the transformer before replacement, P k2 is the rated load loss of the transformer after replacement, k is the shape factor, β is the average load factor of the transformer, I 01 % is the no-load current of the transformer before replacement, I 02 % is the no-load current of the transformer after replacement, S N1 is the rated capacity of the transformer before replacement, S N2 is the rated capacity of the transformer after replacement, U k1 % is the short-circuit impedance of the transformer before replacement, U k2 % is the short-circuit impedance of the transformer after replacement, K Q is the reactive economic equivalent, and T is the operating time.

[0025] Preferably, the data on the impact of transformer replacement on power grid line loss also includes: environmental condition data, which affects the heat dissipation effect and operating efficiency of the transformer;

[0026] Environmental condition data includes one or more of the following: temperature, humidity, and altitude.

[0027] Preferably, the power grid data includes one or more of the following: power grid topology, power grid line parameters, power grid load distribution, and power grid historical operation data.

[0028] Preferably, obtaining data on the impact of transformer replacement on power grid line losses includes:

[0029] Obtain initial data on the impact of transformer replacement on grid line losses;

[0030] Preprocessing the initial data to obtain preprocessed data;

[0031] Among them, the methods of preprocessing the initial data include one or more of the following: data cleaning, data standardization, data integration, and data verification.

[0032] Based on the same inventive concept, the present invention also provides a system for measuring the impact of transformer replacement on power grid line loss, the system comprising:

[0033] A line loss impact data acquisition module is used to acquire data on the impact of transformer replacement on power grid line loss. The data on the impact of transformer replacement on power grid line loss includes transformer data and power grid data.

[0034] An energy efficiency evaluation data acquisition module is used to evaluate the energy efficiency of the transformer according to the transformer data and obtain the energy efficiency evaluation data of the transformer;

[0035] A circuit simulation result acquisition module is used to obtain power grid simulation results based on a power grid simulation analysis model and in combination with the energy efficiency evaluation data of the transformer and power grid data;

[0036] The line loss calculation result acquisition module is used to extract the measurement data related to the impact of transformer replacement on the power grid line loss according to the power grid simulation results, calculate the loss reduction effect according to the measurement data, and obtain the measurement results of the impact of transformer replacement on the power grid line loss.

[0037] Preferably, the transformer data includes parameter information of the transformer; the parameter information is used to reflect the performance characteristics and operating status of the transformer;

[0038] The parameter information includes one or more of the following: capacity, impedance, voltage ratio, iron loss, copper loss, and load rate.

[0039] Preferably, the energy efficiency evaluation data acquisition module includes:

[0040] A static evaluation submodule is used to obtain working state parameters of the transformer through static measurement, and obtain energy efficiency evaluation data of the transformer according to the working state parameters and parameter information;

[0041] Alternatively, the dynamic evaluation submodule is used to obtain the response performance of the transformer through dynamic measurement, and obtain energy efficiency evaluation data of the transformer according to the response performance and parameter information.

[0042] Preferably, the circuit simulation result acquisition module includes:

[0043] The operation status simulation submodule is used to combine the energy efficiency evaluation data of the transformer and the power grid data, and simulate the actual operation status of the power grid based on the power grid simulation analysis model;

[0044] The energy efficiency evaluation data acquisition submodule is used to simulate the transformer replacement process by adjusting the parameter information of the transformer in the power grid simulation analysis model to obtain the energy efficiency evaluation data after the transformer is replaced;

[0045] The power grid simulation result acquisition submodule is used to obtain the power grid simulation results according to the actual operation status of the power grid and the energy efficiency evaluation data after the transformer is replaced.

[0046] Preferably, the running status simulation submodule is specifically used for:

[0047] The simulation time parameters are adjusted in the power grid simulation analysis model to simulate the dynamically changing operating state of the power grid.

[0048] Preferably, the line loss measurement result acquisition module is specifically used to:

[0049] Substituting the measured data into the pre-established loss reduction electric quantity calculation formula of the influence of transformer replacement on the line loss of the power grid to calculate the loss reduction effect, the measurement result of the influence of transformer replacement on the line loss of the power grid is obtained;

[0050] Among them, the calculation formula for the power loss reduction effect of transformer replacement on power grid line loss is as follows:

[0051] Δ(ΔA)={(P 01 -P 02 )+k 2 β 2 (P k1 -P k2 )+[(I 01 %S N1 -I 02 %S N2 )+k 2 β 2 (U k1 %S N1 -U k2 %S N2 )]K Q ×10 -2}T

[0052] Among them, Δ(ΔA) is the power loss reduction caused by transformer replacement on power grid line loss, P 01 is the no-load loss of the transformer before replacement, P 02 is the no-load loss of the transformer after replacement, P k1 is the rated load loss of the transformer before replacement, P k2 is the rated load loss of the transformer after replacement, k is the shape factor, β is the average load factor of the transformer, I 01 % is the no-load current of the transformer before replacement, I 02 % is the no-load current of the transformer after replacement, SN1 is the rated capacity of the transformer before replacement, S N2 is the rated capacity of the transformer after replacement, U k1 % is the short-circuit impedance of the transformer before replacement, U k2 % is the short-circuit impedance of the transformer after replacement, K Q is the reactive economic equivalent, and T is the operating time.

[0053] Preferably, the data on the impact of transformer replacement on power grid line loss also includes: environmental condition data, which affects the heat dissipation effect and operating efficiency of the transformer;

[0054] Environmental condition data includes one or more of the following: temperature, humidity, and altitude.

[0055] Preferably, the power grid data includes one or more of the following: power grid topology, power grid line parameters, power grid load distribution, and power grid historical operation data.

[0056] Preferably, the line loss impact data acquisition module is specifically used for:

[0057] Obtain initial data on the impact of transformer replacement on grid line losses;

[0058] Preprocessing the initial data to obtain preprocessed data;

[0059] Among them, the methods of preprocessing the initial data include one or more of the following: data cleaning, data standardization, data integration, and data verification.

[0060] Based on the same inventive concept, the present invention also provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0061] The memory is used to store one or more programs;

[0062] When the one or more programs are executed by the at least one processor, the method for calculating the impact of transformer replacement on power grid line loss as described above is implemented.

[0063] Based on the same inventive concept, the present invention also provides a readable storage medium having an execution program stored thereon. When the execution program is executed, the method for calculating the impact of transformer replacement on power grid line loss as described above is implemented.

[0064] Compared with the closest prior art, the present invention has the following beneficial effects:

[0065] The present invention provides a method for calculating the impact of transformer replacement on power grid line loss, obtaining data on the impact of transformer replacement on power grid line loss, the data on the impact of transformer replacement on power grid line loss including transformer data and power grid data; performing energy efficiency evaluation on the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer; based on a power grid simulation analysis model, combining the energy efficiency evaluation data of the transformer and the power grid data, obtaining power grid simulation results; based on the power grid simulation results, extracting measurement data related to the impact of transformer replacement on power grid line loss, calculating the loss reduction effect according to the measurement data, and obtaining the measurement results of the impact of transformer replacement on power grid line loss. The present invention takes into account the transformer energy efficiency factor when calculating the impact of transformer replacement on power grid line loss, and combines the power grid model simulation analysis software to accurately calculate the measurement value of the impact of transformer replacement on power grid line loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic flow chart of a method for calculating the impact of transformer replacement on power grid line loss provided by the present invention;

[0067] Figure 2 A specific flow chart of a method for calculating the impact of transformer replacement on power grid line loss provided by the present invention;

[0068] Figure 3 The load and loss curves of the S-200 series transformers with different energy efficiency levels provided by the present invention;

[0069] Figure 4 A structural diagram of a system for measuring the impact of transformer replacement on power grid line loss provided by the present invention;

[0070] Figure 5 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0071] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0072] Embodiment 1:

[0073] The present invention provides a method for calculating the impact of transformer replacement on power grid line loss, specifically, Figure 1 A flow chart of a method for calculating the effect of transformer replacement on power grid line loss provided in an embodiment of the present invention includes the following steps as shown in the figure:

[0074] S1: Obtain data on the impact of transformer replacement on power grid line loss. The data on the impact of transformer replacement on power grid line loss includes transformer data and power grid data.

[0075] S2: Evaluate the energy efficiency of the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer;

[0076] S3: Based on the power grid simulation analysis model, the power grid simulation results are obtained by combining the energy efficiency evaluation data of the transformer and the power grid data;

[0077] S4: According to the power grid simulation results, the measurement data related to the impact of transformer replacement on the power grid line loss is extracted, and the loss reduction effect is calculated based on the measurement data to obtain the measurement results of the impact of transformer replacement on the power grid line loss.

[0078] The present invention takes into account the energy efficiency factor of the transformer when calculating the impact of transformer replacement on the power grid line loss, and combines with the power grid model simulation analysis software to accurately calculate the estimated value of the impact of transformer replacement on the power grid line loss, providing a scientific basis for transformer replacement and optimization decisions, and providing strong technical support for the optimized operation of the power system.

[0079] Data collection is the first step to obtain the information required for the impact of transformer replacement on grid line losses. In one implementation, in order to accurately calculate the measurement results of the impact of transformer replacement on grid line losses, the collected data can be preprocessed. For example, the data on the impact of transformer replacement on grid line losses obtained in S1 include: obtaining initial data on the impact of transformer replacement on grid line losses; preprocessing the initial data to obtain preprocessed data.

[0080] Acquiring initial data on the impact of transformer replacement on grid line loss is the first step in the present invention, and its goal is to obtain detailed data on the transformer and the grid, providing a basis for subsequent energy efficiency evaluation, grid modeling, and simulation analysis. In the present invention, the data on the impact of transformer replacement on grid line loss includes transformer data and grid data.

[0081] Among them, obtaining transformer data includes obtaining detailed parameter information of existing transformers and candidate transformers, such as capacity, impedance, voltage ratio, iron loss, copper loss, load rate, etc. The detailed parameter information of the transformer reflects the performance characteristics and operating status of the transformer, and is an important basis for evaluating energy efficiency and formulating replacement plans.

[0082] Obtaining grid data includes obtaining the topological structure of the grid, the line parameters of the grid (such as resistance, inductance, etc.), the load distribution of the grid, the historical operation data of the grid, etc. These data reflect the structure and operation status of the grid and are key input data for building grid models, conducting simulation analysis, and calculating line losses.

[0083] In addition, the data on the impact of transformer replacement on grid line loss also includes environmental condition data, such as temperature, humidity, altitude, etc., which may affect the heat dissipation effect and operating efficiency of the transformer. In order to further improve the accuracy of energy efficiency evaluation, the transformer can be considered when conducting energy efficiency evaluation.

[0084] There are many ways to obtain the initial data of the impact of transformer replacement on the line loss of the power grid, such as directly obtaining real-time data from the monitoring system of the power system, extracting historical data from the historical database, obtaining equipment parameters from the equipment manufacturer or supplier, etc. The way to obtain the initial data of the impact of transformer replacement on the line loss of the power grid is not limited here, and any feasible way to obtain the initial data of the impact of transformer replacement on the line loss of the power grid is within the scope of protection claimed by the present invention.

[0085] After obtaining the initial data on the impact of transformer replacement on power grid line loss, a series of preprocessing operations can be performed to preprocess the initial data to obtain preprocessed data. This ensures the accuracy and consistency of the data and lays the foundation for subsequent analysis and calculation. The preprocessing of initial data mainly includes but is not limited to the following methods: data cleaning, data standardization, data integration and data verification.

[0086] Data cleaning is used to remove duplicate, erroneous or abnormal initial data, such as missing values, invalid values ​​or values ​​outside a reasonable range. For missing values, interpolation, mean or median can be used to fill in the missing values ​​according to the distribution of the initial data.

[0087] Data standardization is used to standardize the data to make it have a unified measurement standard because different data sources and measurement units may cause dimensional differences between the initial data. Commonly used standardization methods include minimum-maximum standardization and Z-score standardization.

[0088] Data integration is used to integrate various types of initial data obtained to form a complete data set. During the integration process, it is necessary to ensure the correspondence and consistency of the data to facilitate subsequent analysis and calculation.

[0089] Data verification is used to verify the data preprocessed in the above way to ensure the accuracy and completeness of the data. Cross-validation, comparative validation and other methods can be used to verify and ensure the reliability of the data.

[0090] By obtaining the initial data of the impact of transformer replacement on power grid line loss and preprocessing the initial data, a complete, accurate and consistent data set can be obtained, providing strong support for subsequent energy efficiency evaluation and power grid model simulation analysis. These data serve as the basis for the implementation of the technical solution of the present invention and provide a decision-making basis for the optimized operation of the power system.

[0091] In S2, the energy efficiency of the transformer is evaluated according to the obtained transformer data, and the energy efficiency evaluation data of the transformer is obtained. Energy efficiency evaluation can be performed in a variety of ways, such as static measurement method, dynamic measurement method, etc. Specifically, the working state parameters of the transformer are directly measured by static measurement, and the energy efficiency evaluation data of the transformer is obtained according to the working state parameters and the parameter information of the transformer. This method is suitable for loaded transformers. The dynamic measurement method is to measure the response performance of the transformer, and the energy efficiency evaluation data of the transformer is obtained according to the response performance and the parameter information of the transformer. This method is suitable for transformers under no-load or small-load conditions. A reasonable transformer energy efficiency evaluation method can be selected according to the actual load conditions of the transformer.

[0092] In addition, the economic operating range of the transformer can also be considered to determine its energy efficiency performance under different load conditions. Through energy efficiency evaluation, alternative transformers with higher energy efficiency can be screened out, providing a basis for the subsequent formulation of transformer replacement methods. The standard system in this invention adopts the new version of the energy efficiency standard GB20052-2020 "Energy Efficiency Limit Values ​​and Energy Efficiency Grades for Power Transformers". The energy efficiency standard provides a reference basis and test conditions for evaluating the energy efficiency of transformers.

[0093] The present invention fully considers the comprehensive influence of multiple factors when evaluating the energy efficiency of the transformer, including iron loss, copper loss, load rate, etc., which solves the problem that the prior art overly relies on a single data or indicator to evaluate the energy efficiency of the transformer, ignores the comprehensive influence of multiple factors, and thus leads to inaccurate energy efficiency evaluation results, affecting the scientific nature of the transformer replacement decision.

[0094] After obtaining the energy efficiency evaluation data of the transformer, S3 obtains the grid simulation results based on the grid simulation model by combining the energy efficiency evaluation data of the transformer and the grid data.

[0095] Combine the energy efficiency evaluation data of the transformer and the power grid data, and simulate the actual operation status of the power grid based on the power grid simulation model; simulate the process of transformer replacement by adjusting the parameter information of the transformer in the power grid simulation analysis model, and obtain the energy efficiency evaluation data after the transformer replacement; obtain the power grid simulation results based on the actual operation status of the power grid and the energy efficiency evaluation data after the transformer replacement. You can also set parameters such as simulation time and step size in the power grid simulation analysis model, and simulate the dynamically changing operation status of the power grid by adjusting the simulation time parameters and step size parameters.

[0096] Specifically, the power grid simulation analysis model is used, combined with the acquired data, such as topological structure data, line parameters, equipment characteristics, etc., to calculate and reflect the actual operation status of the power grid and the energy efficiency characteristics of the transformer. The process of transformer replacement is simulated in the power grid simulation analysis model, and the impact of different replacement schemes on the line loss of the power grid is analyzed. Specifically, this can be achieved by adjusting the transformer parameter information in the model and observing the change of the line loss of the power grid. According to the actual topological structure, line parameters, equipment characteristics, etc. of the power grid, the existing professional power grid simulation analysis model is used to set the parameters of the transformer in detail in the model, including capacity, impedance, loss, etc., to reflect the energy efficiency characteristics of the transformer. Parameters such as simulation time and step size are set to ensure that the simulation process can fully reflect the dynamic changes of the power grid. Different operation scenarios can be set as needed, such as different load levels, different transformer operation states, etc. Simulation operation is carried out in the constructed power grid model to simulate the actual operation status of the power grid and record key data in the simulation process, such as voltage, current, power flow, line loss, etc.

[0097] S4 extracts the measured data related to the impact of transformer replacement on grid line loss based on the grid simulation results. Specifically, the simulation results are analyzed in depth to extract key data related to the calculation of loss reduction effect of transformer replacement. For example, line loss values ​​under different operating scenarios, transformer loss conditions, power factor of the grid, etc. The extracted data is sorted and classified according to different operating scenarios or transformer parameters, and applied to the subsequent calculation of loss reduction effect of transformer replacement. Ensure the accuracy and completeness of the data to provide a reliable basis for the subsequent calculation of loss reduction effect.

[0098] After extracting the measured data related to the impact of transformer replacement on grid line loss, the measured data is substituted into the pre-established loss reduction electricity calculation formula for the impact of transformer replacement on grid line loss to calculate the loss reduction effect, and the measurement result of the impact of transformer replacement on grid line loss is obtained.

[0099] The formula for calculating the power loss reduction caused by transformer replacement on power grid line loss is as follows:

[0100] Δ(ΔA)={(P 01 -P 02 )+k 2 β 2 (P k1 -P k2 )+[(I 01 %S N1 -I 02 %S N2 )+k 2 β 2 (U k1 %S N1 -U k2 %S N2)]K Q ×10 -2}T

[0101] Among them, Δ(ΔA) is the power loss reduction caused by transformer replacement on power grid line loss, P 01 is the no-load loss of the transformer before replacement, P 02 is the no-load loss of the transformer after replacement, P k1 is the rated load loss of the transformer before replacement, P k2 is the rated load loss of the transformer after replacement, k is the shape factor, β is the average load factor of the transformer, I 01 % is the no-load current of the transformer before replacement, I 02 % is the no-load current of the transformer after replacement, S N1 is the rated capacity of the transformer before replacement, S N2 is the rated capacity of the transformer after replacement, U k1 % is the short-circuit impedance of the transformer before replacement, U k2 % is the short-circuit impedance of the transformer after replacement, K Q is the reactive economic equivalent, and T is the operating time.

[0102] Substitute the relevant data of the impact of transformer replacement on grid line loss into the loss reduction electric quantity calculation formula of the impact of transformer replacement on grid line loss to obtain the loss reduction electric quantity of the impact of transformer replacement on grid line loss.

[0103] When Δ(ΔA)>0, the amount of power loss reduction caused by transformer replacement on the grid line loss is positive, that is, transformer replacement reduces the amount of power grid line loss; when Δ(ΔA)<0, the amount of power loss reduction caused by transformer replacement on the grid line loss is negative, that is, transformer replacement increases the amount of power grid line loss; when Δ(ΔA)=0, transformer replacement has no effect on the power grid line loss.

[0104] In practical applications, due to the complexity of the actual situation of high-energy-consuming transformer replacement, in the process of calculating the line loss power correction of transformer transformation at each voltage level, typical high-energy-consuming transformer transformation cases at each voltage level can be selected to estimate the power saving. Specifically, first use the loss reduction power calculation formula for the impact of transformer replacement on power grid line loss to estimate the loss reduction power of a single transformer transformation, and then calculate the line loss power correction caused by transformer transformation = single transformer transformation loss reduction power × total number of transformers transformed.

[0105] According to the relevant measurement data extracted from the power grid simulation analysis model, combined with the loss reduction power calculation formula of the transformer replacement on the power grid line loss, the measurement results of the transformer replacement on the power grid line loss are obtained. The obtained measurement results can be expressed in absolute loss reduction (such as the number of kilowatt-hours reduced) or relative loss reduction rate (such as the percentage of reduction). The obtained measurement results can assist in optimizing decisions. According to the calculation results of the loss reduction effect, combined with factors such as economy and feasibility, the on-site business staff can be assisted in selecting the optimal transformer replacement plan.

[0106] like Figure 2 The above is a specific flow chart of a method for measuring the impact of transformer replacement on power grid line loss provided by the present invention. First, data collection is performed to obtain one or more of existing transformer data, candidate transformer data, topology data, operation data, and environmental condition data. Secondly, the collected data is preprocessed, and the preprocessing method includes one or more of data cleaning, data standardization, data integration, and data verification. Then, the transformer energy efficiency is evaluated based on the transformer data, and then the power grid simulation analysis model is used for simulation analysis, and the model simulation results are output. Then, the simulation data before and after the transformer update is extracted, and the extracted simulation data includes no-load loss, rated load loss, no-load current, short-circuit impedance, rated capacity, etc. Then, according to the extracted simulation data and the loss reduction power calculation formula of the transformer replacement on the power grid line loss, the line loss power change caused by the transformer replacement is calculated, and finally, according to the line loss power change, the on-site business staff are assisted to optimize the decision and select the optimal transformer replacement plan.

[0107] The present invention solves the following problems existing in the prior art when calculating the influence of transformer replacement on power grid line loss by proposing a method for calculating the influence of transformer replacement on power grid line loss:

[0108] First, existing technologies often over-rely on a single data or indicator to evaluate the energy efficiency of transformers, ignoring the combined impact of multiple factors. This simplified evaluation method leads to inaccurate energy efficiency evaluation results, thus affecting the scientific nature of transformer replacement decisions.

[0109] Second, existing technologies have limitations and inaccuracies in line loss calculation. The topology of the power grid is complex, and factors such as current distribution and line impedance may have a significant impact on line loss. However, existing technologies fail to fully consider these factors, resulting in deviations between the calculated line loss value and the actual situation.

[0110] Third, existing technologies often lack consideration of the dynamic changes of the power grid. The load and operating status of the power grid change in real time, but existing technologies only calculate and analyze based on static data, which cannot accurately reflect the real-time status of the power grid, resulting in poor results of transformer replacement solutions in actual operation, and even increasing line losses in the power grid.

[0111] Fourth, existing technologies are also insufficient in decision support. Although the technical methods proposed by existing technologies can calculate the line loss after transformer replacement, they lack in-depth analysis and suggestions for optimization solutions. It is difficult for decision makers to formulate effective optimization measures based on these results, thus limiting the effectiveness of the technology in practical applications.

[0112] Therefore, the existing technology has many shortcomings in the measurement of the impact of transformer replacement on the line loss of the power grid, and needs to be further improved and perfected. The present invention aims to overcome the shortcomings of the existing technology and improve the scientificity and accuracy of transformer replacement decision-making by comprehensively considering multiple factors, accurately calculating line loss, considering dynamic changes in the power grid, and providing decision support.

[0113] In view of the shortcomings of the prior art in calculating the impact of transformer replacement on power grid line losses, the present invention aims to provide a more comprehensive, accurate and practical calculation method.

[0114] Improve the accuracy of transformer energy efficiency assessment. By comprehensively considering the transformer energy efficiency factors, including iron loss, copper loss, load rate, etc., as well as the real-time operation status and load conditions of the power grid, the transformer energy efficiency level can be more accurately assessed, providing a more scientific basis for transformer replacement decisions.

[0115] Accurately calculate the impact of transformer replacement on power grid line loss. By using advanced power grid simulation analysis software, the simulation results are deeply analyzed to extract key data related to the calculation of transformer replacement loss reduction effect; these data include line loss values ​​under different operating scenarios, transformer loss conditions, power grid power factor, etc.; the extracted data are sorted and classified according to different operating scenarios or transformer parameters, and applied to the subsequent transformer replacement loss reduction effect calculation. The power grid line loss after transformer replacement can be calculated more accurately, providing more reliable reference data for decision makers. Through a comprehensive analysis process involving multiple factors, it aims to select the best transformer replacement solution to achieve the greatest loss reduction effect.

[0116] Optimization and adjustment measures and decision support. By comparing the energy efficiency before and after transformer replacement and analyzing the changes in line losses, targeted optimization and adjustment suggestions are given to help decision makers develop more reasonable transformer replacement plans to improve grid energy efficiency and reduce line losses.

[0117] The purpose of the present invention is to provide a more comprehensive, accurate and practical method for measuring the impact of transformer replacement on line loss for power system planners and managers by comprehensively considering the energy efficiency factors of the transformer, accurately calculating the line loss of the power grid, providing optimization adjustment measures and decision support, so as to promote the optimized operation and sustainable development of the power system.

[0118] The method for calculating the impact of transformer replacement on power grid line loss provided by the present invention includes a detailed design and process of the calculation method, covering key steps such as the algorithm process and calculation rules. In addition, by introducing advanced power grid simulation analysis software and calculation tools, combined with transformer energy efficiency evaluation and power grid modeling technology, a new method for calculating the impact of transformer replacement on line loss considering energy efficiency is proposed: a method for calculating the loss reduction effect of transformer replacement. This loss reduction technical method not only improves the accuracy and efficiency of the measurement, but also provides new ideas and means for the optimized operation of the power system.

[0119] The method for calculating the impact of transformer replacement on power grid line loss provided by the present invention has the following effects:

[0120] First, the present invention significantly improves the accuracy and effectiveness of transformer replacement decisions. Traditional methods for measuring the impact of transformer replacement on grid line losses often only focus on the capacity and load rate of the transformer, while ignoring the key factor of energy efficiency. The present invention can more accurately reflect the operating efficiency of the transformer and its impact on grid line losses by introducing energy efficiency evaluation. At the same time, when calculating the line loss of the grid, the resistance of the line, the distribution of the current, the impedance of the transformer, etc. are comprehensively considered. Through precise modeling and simulation, the impact of the above factors on the grid line loss is considered, so as to accurately calculate the grid line loss after the transformer is replaced. By comprehensively considering the energy efficiency factors of the transformer, the actual situation and needs of the grid, the present invention can accurately evaluate the impact of transformer replacement on grid line losses and provide decision makers with a reliable decision-making basis. This helps to avoid blind or unreasonable replacement, reduce decision-making risks, and improve the economic benefits and energy efficiency of the power system.

[0121] Second, the present invention helps to achieve energy conservation and consumption reduction in the power grid. In the process of transformer replacement, how to select the appropriate transformer model, capacity and location to minimize line loss is an important technical issue. The present invention accurately calculates the line loss of the power grid by comprehensively considering factors such as the energy efficiency of the transformer, the topological structure of the power grid, and the load distribution. The present invention can find out the links with low energy efficiency in the power grid, so as to formulate targeted optimization and adjustment measures and optimize the transformer replacement plan. This helps to reduce the energy consumption and operating costs of the power grid and improve the overall energy efficiency level of the power system.

[0122] Third, the present invention also provides decision support. The present invention not only provides energy efficiency comparison and line loss change before and after transformer replacement, but also provides optimization and adjustment measures to provide decision support for power system planners and managers. It helps to reduce the energy consumption of the power grid, improve energy utilization efficiency, and promote the sustainable development of the power system.

[0123] Fourth, the present invention is also highly practical and universal. The technical solution of the present invention is not only applicable to specific types of transformers and power grid structures, but can also be flexibly adjusted and optimized according to the actual conditions and needs of different power grids. Therefore, the present invention has broad application prospects and promotion value.

[0124] Fifth, the present invention is innovative. By introducing advanced power grid simulation analysis software and calculation tools, combined with transformer energy efficiency evaluation and power grid modeling technology, the present invention proposes a new method for calculating the impact of transformer replacement on line loss that takes energy efficiency into consideration. This method not only improves the accuracy and efficiency of the calculation, but also provides new ideas and means for the optimized operation of the power system.

[0125] In summary, the present invention has achieved remarkable results in improving the accuracy and effectiveness of transformer replacement decisions, achieving energy saving and consumption reduction in power grids, enhancing practicality and versatility, and promoting technological innovation, etc. These effects will help promote the optimized operation and sustainable development of power systems.

[0126] The following is a detailed description of a specific example of the method for calculating the impact of transformer replacement on power grid line losses provided by the present invention.

[0127] According to the new version of the energy efficiency standard GB20052-2020 "Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers", the transformer energy efficiency grade is divided into 3 levels, among which Level 1 has the highest energy efficiency and the lowest loss, and Level 1 and Level 2 are energy-saving transformers.

[0128] Taking a certain local power grid as an example, there are 87,998 distribution transformers in operation, 4,103 of which are energy-saving (1 and 2 energy efficiency) distribution transformers, accounting for 4.7%, and 83,895 are non-energy-saving (3 and below energy efficiency) distribution transformers, accounting for 95.3%. Among them, there are 32,259 level 3 energy efficiency distribution transformers, accounting for 38.4%, and 51,636 below level 3 energy efficiency distribution transformers, accounting for 61.6%; the transformation potential is large. Among them, Table 1 shows the energy efficiency level of distribution transformers in operation in a certain local power grid company in 2023.

[0129] Energy efficiency rating Quantity (unit) Proportion (%) Main models Level 1 183 0.2 S22, S25 Level 2 3920 4.5 S20 Level 3 32259 36.6 S13, S15 Level 3 and below 51636 58.7 S9, S11

[0130] Table 1

[0131] At present, the energy-saving transformation of transformers mainly adopts two methods: equal capacity transformation or capacity expansion transformation. Taking the transformation of energy-efficient distribution transformers S9-200, S11-200 below level 3 and energy-efficient distribution transformers S13-200 of level 3 into energy-efficient distribution transformers S20 of level 2 as an example, the load and loss curves of S-200 series transformers with different energy efficiency levels are shown in the figure below. Figure 3 shown.

[0132] At different load levels, the impact on grid losses is as follows:

[0133] 1) For non-energy-saving distribution transformers operating at low load levels (load factor 0.1). Table 2 compares the transformation schemes for distribution transformers at low load levels. When the equal-capacity transformation scheme is adopted, the annual power saving of S9, S11 and S13 is 2803, 1226, and 262 kWh, respectively, and the static payback periods are 48.61, 153.96, and 825.38 years, respectively; when the capacity-increasing transformation scheme is adopted, the annual power saving of S9, S11 and S13 is 1927.2, 350.4, and -613.2 kWh, respectively, and the static payback periods are 97.94, 538.67, and -307.81 years, respectively. It can be seen that the energy-saving effect and economy of equal-capacity transformation of non-energy-saving distribution transformers operating at low load levels are better than those of capacity expansion transformation, and the energy-saving effect of transforming the 3-level energy-efficient distribution transformer is not obvious, and even the energy-saving effect of capacity expansion transformation is negative. Therefore, there is little necessity for energy-saving transformation of the 3-level energy-efficient distribution transformer at low load levels.

[0134]

[0135] Table 2

[0136] 2) For non-energy-saving distribution transformers operating at the economic load level (load factor 0.35). Table 3 compares the transformation schemes of distribution transformers under the economic load level. When the equal-capacity transformation scheme is adopted, the annual power saving of S9, S11 and S13 is 3416.4, 1839.6 and 876 kWh respectively, and the static payback period is 39.88, 74.07 and 155.54 years respectively; when the capacity increase transformation scheme is adopted, the annual power saving of S9, S11 and S13 is 4029.6, 2452.8 and 1489.2 kWh respectively, and the static payback period is 46.84, 76.95 and 126.75 years respectively. It can be seen that the equal-capacity or capacity increase transformation of non-energy-saving distribution transformers operating at the economic load level has obvious energy-saving effects. The energy-saving effect of capacity increase transformation is better than that of equal-capacity transformation, but the economy of equal-capacity transformation is higher.

[0137]

[0138]

[0139] Table 3

[0140] 3) For non-energy-saving distribution transformers operating at high load levels (load factor 0.8) in local areas. Comparison of distribution transformer transformation schemes under high load levels. Using the capacity expansion transformation scheme, 200kVA is replaced with 315kVA distribution transformers. The annual power saving of S9, S11 and S13 is 12439, 10862 and 9899 kWh respectively, and the static payback period is 15.17, 17.38 and 19.07 years respectively; 200kVA is replaced with 400kVA distribution transformers. The annual power saving of S9, S11 and S13 is 13403, 11826 and 10862 kWh respectively, and the static payback period is 16.13, 18.29 and 19.91 years respectively. It can be seen that the energy-saving effect of increasing the capacity of high-load non-energy-saving distribution transformers is obvious. Considering the regional load growth, energy-saving effect and economy, it is recommended to replace the original distribution transformer with a 400kVA large-capacity distribution transformer.

[0141]

[0142] Table 4

[0143] To sum up, it is recommended to formulate a reasonable distribution transformer transformation strategy based on the service life, transformation effect and cost of the distribution transformer, focus on transforming non-energy-saving distribution transformers operating at high load levels, and steadily promote the transformation of other non-energy-saving distribution transformers.

[0144] First, for non-energy-saving distribution transformers operating at low load levels, there is little need to replace level 3 energy efficiency distribution transformers. It is recommended to gradually carry out equal capacity transformation for energy efficiency distribution transformers below level 3. Second, for non-energy-saving distribution transformers operating at medium load levels, equal capacity or capacity expansion transformation should be gradually carried out for level 3 and below energy efficiency distribution transformers according to energy consumption levels, and the transformation capacity should be selected based on the distribution transformer being close to the economic load level after transformation. Third, for non-energy-saving distribution transformers operating at high load levels, capacity expansion transformation should be gradually carried out for level 3 and below energy efficiency distribution transformers according to energy consumption levels, and large-capacity distribution transformers should be selected that can bring the distribution transformer close to the economic load level after replacement.

[0145] According to calculations, the power grid company's energy-saving transformation of its existing non-energy-saving distribution transformers according to the above strategy is expected to save 73,000 kWh of electricity annually, reduce the comprehensive line loss rate by 0.11 percentage points, and have a static payback period of 30.15 years.

[0146] Embodiment 2:

[0147] Based on the same inventive concept, the present invention also provides a system 400 for calculating the impact of transformer replacement on power grid line loss. The system structure is as follows: Figure 4 As shown, the system 400 includes: a line loss impact data acquisition module 401, an energy efficiency evaluation data acquisition module 402, a circuit simulation result acquisition module 403, and a line loss measurement result acquisition module 404;

[0148] A line loss impact data acquisition module is used to acquire data on the impact of transformer replacement on power grid line loss. The data on the impact of transformer replacement on power grid line loss includes transformer data and power grid data.

[0149] An energy efficiency evaluation data acquisition module is used to evaluate the energy efficiency of the transformer according to the transformer data and obtain the energy efficiency evaluation data of the transformer;

[0150] A circuit simulation result acquisition module is used to obtain power grid simulation results based on a power grid simulation analysis model and in combination with the energy efficiency evaluation data of the transformer and power grid data;

[0151] The line loss calculation result acquisition module is used to extract the measurement data related to the impact of transformer replacement on the power grid line loss according to the power grid simulation results, calculate the loss reduction effect according to the measurement data, and obtain the measurement results of the impact of transformer replacement on the power grid line loss.

[0152] Preferably, the transformer data includes parameter information of the transformer; the parameter information is used to reflect the performance characteristics and operating status of the transformer;

[0153] The parameter information includes one or more of the following: capacity, impedance, voltage ratio, iron loss, copper loss, and load rate.

[0154] Preferably, the energy efficiency evaluation data acquisition module includes:

[0155] A static evaluation submodule is used to obtain working state parameters of the transformer through static measurement, and obtain energy efficiency evaluation data of the transformer according to the working state parameters and parameter information;

[0156] Alternatively, the dynamic evaluation submodule is used to obtain the response performance of the transformer through dynamic measurement, and obtain energy efficiency evaluation data of the transformer according to the response performance and parameter information.

[0157] Preferably, the circuit simulation result acquisition module includes:

[0158] The operation status simulation submodule is used to combine the energy efficiency evaluation data of the transformer and the power grid data, and simulate the actual operation status of the power grid based on the power grid simulation analysis model;

[0159] The energy efficiency evaluation data acquisition submodule is used to simulate the transformer replacement process by adjusting the parameter information of the transformer in the power grid simulation analysis model to obtain the energy efficiency evaluation data after the transformer is replaced;

[0160] The power grid simulation result acquisition submodule is used to obtain the power grid simulation results according to the actual operation status of the power grid and the energy efficiency evaluation data after the transformer is replaced.

[0161] Preferably, the running status simulation submodule is specifically used for:

[0162] The simulation time parameters are adjusted in the power grid simulation analysis model to simulate the dynamically changing operating state of the power grid.

[0163] Preferably, the line loss measurement result acquisition module is specifically used to:

[0164] Substituting the measured data into the pre-established loss reduction electric quantity calculation formula of the influence of transformer replacement on the line loss of the power grid to calculate the loss reduction effect, the measurement result of the influence of transformer replacement on the line loss of the power grid is obtained;

[0165] Among them, the calculation formula for the power loss reduction effect of transformer replacement on power grid line loss is as follows:

[0166] Δ(ΔA)={(P 01 -P 02 )+k 2 β 2 (P k1 -P k2 )+[(I 01 %S N1 -I 02 %S N2 )+k 2 β 2 (U k1 %S N1 -U k2 %S N2 )]K Q ×10 -2}T

[0167] Among them, Δ(ΔA) is the power loss reduction caused by transformer replacement on power grid line loss, P 01 is the no-load loss of the transformer before replacement, P 02 is the no-load loss of the transformer after replacement, P k1 is the rated load loss of the transformer before replacement, P k2 is the rated load loss of the transformer after replacement, k is the shape factor, β is the average load factor of the transformer, I 01 % is the no-load current of the transformer before replacement, I 02 % is the no-load current of the transformer after replacement, S N1 is the rated capacity of the transformer before replacement, S N2 is the rated capacity of the transformer after replacement, U k1 % is the short-circuit impedance of the transformer before replacement, U k2 % is the short-circuit impedance of the transformer after replacement, K Q is the reactive economic equivalent, and T is the operating time.

[0168] Preferably, the data on the impact of transformer replacement on power grid line loss also includes: environmental condition data, which affects the heat dissipation effect and operating efficiency of the transformer;

[0169] Environmental condition data includes one or more of the following: temperature, humidity, and altitude.

[0170] Preferably, the power grid data includes one or more of the following: power grid topology, power grid line parameters, power grid load distribution, and power grid historical operation data.

[0171] Preferably, the line loss impact data acquisition module is specifically used for:

[0172] Obtain initial data on the impact of transformer replacement on grid line losses;

[0173] Preprocessing the initial data to obtain preprocessed data;

[0174] Among them, the methods of preprocessing the initial data include one or more of the following: data cleaning, data standardization, data integration, and data verification.

[0175] Embodiment 3:

[0176] Based on the same inventive concept, Figure 5 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0177] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a readable storage medium to implement the corresponding method flow or corresponding functions, so as to realize the steps of the method for measuring the impact of transformer replacement on power grid line loss in the above-mentioned embodiment.

[0178] Embodiment 4:

[0179] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in the electronic device for storing programs and data. It can be understood that the readable storage medium here can include both the built-in storage medium in the electronic device and the extended storage medium supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk storage. The processor can load and execute one or more instructions stored in the storage medium to implement the steps of the method for calculating the impact of transformer replacement on power grid line loss in the above embodiment.

[0180] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0181] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0182] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0183] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A method for calculating the impact of transformer replacement on power grid line loss, characterized in that: include: Acquire data on the impact of transformer replacement on power grid line loss, wherein the data on the impact of transformer replacement on power grid line loss includes transformer data and power grid data; Performing energy efficiency evaluation on the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer; Based on the power grid simulation analysis model, combining the energy efficiency evaluation data of the transformer and the power grid data, obtaining a power grid simulation result; According to the power grid simulation results, the measured data related to the impact of transformer replacement on power grid line loss are extracted, and the loss reduction effect is calculated based on the measured data to obtain the measured results of the impact of transformer replacement on power grid line loss.

2. The method according to claim 1, characterized in that The transformer data includes parameter information of the transformer; the parameter information is used to reflect the performance characteristics and operating status of the transformer; The parameter information includes one or more of the following: capacity, impedance, voltage ratio, iron loss, copper loss, and load rate.

3. The method according to claim 2, characterized in that The step of performing energy efficiency evaluation on the transformer according to the transformer data to obtain energy efficiency evaluation data of the transformer includes: Obtaining working state parameters of the transformer through static measurement, and obtaining energy efficiency evaluation data of the transformer according to the working state parameters and the parameter information; Alternatively, the response performance of the transformer is obtained through dynamic measurement, and the energy efficiency evaluation data of the transformer is obtained according to the response performance and the parameter information.

4. The method according to claim 1, characterized in that: The power grid simulation analysis model is based on the energy efficiency evaluation data of the transformer and the power grid data to obtain the power grid simulation result, including: Combining the energy efficiency evaluation data of the transformer and the power grid data, simulating the actual operation state of the power grid based on a power grid simulation analysis model; In the power grid simulation analysis model, the transformer replacement process is simulated by adjusting the parameter information of the transformer to obtain energy efficiency evaluation data after the transformer is replaced; The power grid simulation result is obtained according to the actual operating status of the power grid and the energy efficiency evaluation data after the transformer is replaced.

5. The method according to claim 4, characterized in that The actual operation state of the power grid is simulated based on the power grid simulation analysis model, including: The simulation time parameters are adjusted in the power grid simulation analysis model to simulate the dynamically changing operation state of the power grid.

6. The method according to claim 1, characterized in that The loss reduction effect calculation is performed according to the measured data to obtain the measurement result of the influence of transformer replacement on the power grid line loss, including: Substituting the measured data into a pre-established loss reduction electric quantity calculation formula for the influence of transformer replacement on power grid line loss to calculate the loss reduction effect, and obtaining a measurement result of the influence of transformer replacement on power grid line loss; The calculation formula for the power loss reduction caused by transformer replacement on the power grid line loss is as follows: Δ(ΔA)={(P 01 -P 02 )+k 2 β 2 (P k1 -P k2 )+[(I 01 %S N1 -I 02 %S N2 )+k 2 β 2 (U k1 %S N1 -U k2 %S N2 )]K Q ×10 -2 }T Among them, Δ(ΔA) is the power loss reduction caused by transformer replacement on power grid line loss, P 01 is the no-load loss of the transformer before replacement, P 02 is the no-load loss of the transformer after replacement, P k1 is the rated load loss of the transformer before replacement, P k2 is the rated load loss of the transformer after replacement, k is the shape factor, β is the average load factor of the transformer, I 01 % is the no-load current of the transformer before replacement, I 02 % is the no-load current of the transformer after replacement, S N1 is the rated capacity of the transformer before replacement, S N2 is the rated capacity of the transformer after replacement, U k1 % is the short-circuit impedance of the transformer before replacement, U k2 % is the short-circuit impedance of the transformer after replacement, K Q is the reactive economic equivalent, and T is the operating time.

7. The method according to claim 1, characterized in that The data on the impact of transformer replacement on grid line loss also includes: environmental condition data, which affects the heat dissipation effect and operating efficiency of the transformer; The environmental condition data includes one or more of the following: temperature, humidity, and altitude.

8. The method according to claim 1, characterized in that The power grid data includes one or more of the following: power grid topology, power grid line parameters, power grid load distribution, and power grid historical operation data.

9. The method according to claim 1, characterized in that: The data for obtaining the impact of transformer replacement on power grid line loss includes: Obtain initial data on the impact of transformer replacement on grid line losses; Preprocessing the initial data to obtain preprocessed data; The method of preprocessing the initial data includes one or more of the following: data cleaning, data standardization, data integration, and data verification.

10. A system for measuring the impact of transformer replacement on power grid line loss, characterized in that: include: A line loss impact data acquisition module is used to acquire data on the impact of transformer replacement on power grid line loss, wherein the data on the impact of transformer replacement on power grid line loss includes transformer data and power grid data; An energy efficiency evaluation data acquisition module, used to perform energy efficiency evaluation on the transformer according to the transformer data, and obtain energy efficiency evaluation data of the transformer; A circuit simulation result acquisition module, used to obtain a power grid simulation result based on a power grid simulation analysis model and in combination with the energy efficiency evaluation data of the transformer and the power grid data; The line loss calculation result acquisition module is used to extract the measurement data related to the impact of transformer replacement on the power grid line loss according to the power grid simulation results, calculate the loss reduction effect according to the measurement data, and obtain the measurement result of the impact of transformer replacement on the power grid line loss.

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