Line loss level evaluation method for power grid characteristic difference

Abstract

The invention provides a line loss level evaluation method for power grid characteristic difference, and belongs to the technical field of line optimization, and the method comprises the steps: determining the actual trend and laying route of a target cable through the combination of related data and on-site detection, and determining the line loss condition of the cable; determining the position of each main electric device in the area; speculating the electric quantity demand condition of each electric device according to the historical data, and generating a plurality of power supply schemes meeting the demand condition by taking the power supply point and the main power supply line as starting points and the electric devices as terminal points; a plurality of power supply schemes are sorted and screened according to factors of line loss, transformation cost and construction period, and the most required power supply scheme is taken as an improvement measure of a corresponding cable. According to the line loss level evaluation method for the power grid characteristic difference, power supply to a plurality of electric devices under the condition of low line loss is realized, energy is saved, and more importantly, the generated scheme is relatively high in performability and relatively great in reference significance.

Description

Technical Field

[0001] The present invention belongs to the technical field of line optimization, and more specifically, relates to a line loss level evaluation method involving differences in power grid characteristics. Background Art

[0002] The power system is an integral whole consisting of power plants, transmission networks, distribution networks and power users. The function of the distribution network is to distribute electric energy directly from hub substations to users, or to distribute it to users via distribution substations. Therefore, in the power system, as an important infrastructure to ensure people's livelihood, the distribution network is the final link directly facing the end power users. Its safe and stable operation is directly related to the electricity benefits, quality and reliability of each user.

[0003] Line loss is the abbreviation of active energy loss generated during network transmission. Line loss calculation and analysis is an important part of the power industry. Through line loss analysis, managers can formulate more targeted loss reduction measures, save electricity, and increase economic benefits. Existing improvement methods cannot improve the line loss of distribution networks during the transmission of electricity for multiple power-consuming devices, resulting in serious energy waste, and the generated solutions cannot be effectively implemented. Summary of the invention

[0004] The purpose of the present invention is to provide a method for evaluating line loss levels of power grid characteristics differences, aiming to solve the problem that the line loss of the distribution network during the transmission of electric energy cannot be improved for multiple power-consuming devices, resulting in serious energy waste.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a line loss level evaluation method for power grid characteristic differences, including:

[0006] The upper and lower hierarchical relationships of the distribution network are determined based on the topological relationship, and the actual direction and laying route of the target cable are determined in combination with relevant information and on-site inspections, and the line loss of the cable is determined; the locations of the main power-consuming equipment in the area are determined, and the locations of the power supply points in the area and the actual direction of the main power supply lines are calibrated; the power demand of each power-consuming equipment is inferred based on historical data, and multiple power supply plans that meet the demand are generated with the power supply points and the main power supply lines as the starting points and the power-consuming equipment as the end points; the multiple power supply plans are sorted and screened based on the line loss size, transformation cost and construction period factors, and the power supply plan with the most requirements is used as the improvement measure corresponding to the cable.

[0007] In a possible implementation, the actual direction and laying route of the target cable determined by combining relevant data and on-site detection includes:

[0008] The higher the level in the topological relationship, the higher the target level is set, and the actual laying conditions of the cables that are not less than the target level are determined respectively.

[0009] In a possible implementation, the actual direction and laying route of the target cable determined by combining relevant data and on-site detection includes:

[0010] In combination with the topological relationship, the line loss of each cable is monitored in real time, and the total line loss level is determined.

[0011] In a possible implementation, the actual direction and laying route of the target cable determined by combining relevant data and on-site detection includes:

[0012] Creating a spatial model of the cable and creating a structure for supporting and positioning the cable based on the model;

[0013] The underground and above-ground conditions around the cables and the structure are restored in proportion according to the actual situation.

[0014] In a possible implementation, the calibrating the location of the power supply point in the area and the actual direction of the main power supply line includes:

[0015] Detecting the outer diameter, material, rust condition, level in the topology structure and internal resistance value of the cable;

[0016] The parameters of the model are set so that the model and the cable have the same line loss level under the same external conditions.

[0017] In a possible implementation, the actual direction and laying route of the target cable are determined by combining relevant data and on-site detection, and the line loss of the cable is determined, including:

[0018] The parameters of the cable during the power transmission process are detected in real time to determine the line loss of the cable and the reasons causing the change in the line loss.

[0019] In a possible implementation, the improvement measure corresponding to the cable using the most required power supply scheme includes:

[0020] Conducting an overall evaluation of the line loss level of the distribution network;

[0021] If the internal resistance of the cable is large, replace it with a material with a lower internal resistance to reduce the line loss level;

[0022] On the basis of meeting the power supply requirements, the length of the cable is appropriately shortened;

[0023] The cables with different directions are integrated to reduce the overall line loss value.

[0024] In a possible implementation, the improvement measure corresponding to the cable using the most required power supply scheme includes:

[0025] Based on the improvement measures for the cable, the line loss of the cable before and after the improvement and the total line loss level of the distribution network are calculated.

[0026] In a possible implementation, the improvement measure corresponding to the cable using the most required power supply scheme includes:

[0027] During the simulation, a transformer is added to increase the voltage in the cable so as to reduce line loss;

[0028] The power consumption of each of the electrical devices is set to a fixed value. On the basis of meeting the power consumption of each of the electrical devices, lines connecting the power supply point and the main power supply line with the electrical devices are randomly generated, and some section lines with the same direction are integrated to determine the current value and resistance value in the integrated lines, thereby determining the line loss situation.

[0029] In a possible implementation, the generating of multiple power supply schemes that meet the demand conditions with the power supply point and the main power supply line as the starting point and the power-consuming device as the end point includes:

[0030] Compare the differences in the actual cable directions before and after the improvement measures, and analyze the degree of change in the cable support and positioning method after the improvement;

[0031] Based on the line loss level and transformation cost, multiple power supply schemes are screened.

[0032] The beneficial effect of the line loss level evaluation method for power grid characteristic differences provided by the present invention is that: compared with the prior art, the line loss level evaluation method for power grid characteristic differences provided by the present invention first determines the upper and lower hierarchical relationship of the distribution network based on the topological relationship, and determines the actual direction and laying route of the target cable in combination with relevant information and on-site detection, thereby determining the line loss of the cable. By determining the location of each major power-consuming device in the area, the location of the power supply point in the area and the actual direction of the main power supply line are calibrated. After the power supply point and the main power supply line used to provide electric energy are determined, the power demand of each power-consuming device is inferred based on historical data, and multiple power supply plans are generated. The power supply plan takes the power supply point and the main power supply line as the starting point and the power-consuming device as the end point, and the power supply plan can meet the power demand of the power-consuming device. Multiple power supply plans are sorted and screened, and the most required power supply plan is used as the improvement measure for the corresponding cable.

[0033] In this application, by comparing multiple generated power supply schemes, it is possible to power multiple electrical devices with low line loss, saving energy. More importantly, the generated scheme is highly executable and has great reference value. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A flow chart of a method for evaluating line loss levels based on grid characteristic differences provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] See also Figure 1 The line loss level evaluation method for power grid characteristic differences provided by the present invention is now described. The line loss level evaluation method for power grid characteristic differences includes:

[0038] The upper and lower hierarchical relationships of the distribution network are determined based on the topological relationship. The actual direction and laying route of the target cable are determined in combination with relevant information and on-site inspections, and the line loss of the cable is determined. The locations of the main power-consuming equipment in the area are determined, and the locations of the power supply points in the area and the actual direction of the main power supply lines are calibrated. The power demand of each power-consuming equipment is inferred based on historical data, and multiple power supply plans that meet the demand are generated with the power supply points and main power supply lines as the starting points and the power-consuming equipment as the end points. Multiple power supply plans are sorted and screened based on the size of line loss, transformation cost and construction period, and the power supply plan with the most requirements is used as the improvement measure for the corresponding cable.

[0039] The beneficial effect of the line loss level evaluation method for power grid characteristic differences provided by the present invention is that: compared with the prior art, the line loss level evaluation method for power grid characteristic differences provided by the present invention first determines the upper and lower hierarchical relationship of the distribution network based on the topological relationship, and determines the actual direction and laying route of the target cable in combination with relevant information and on-site detection, thereby determining the line loss of the cable. By determining the location of each major power-consuming device in the area, the location of the power supply point in the area and the actual direction of the main power supply line are calibrated. After the power supply point and the main power supply line used to provide electric energy are determined, the power demand of each power-consuming device is inferred based on historical data, and multiple power supply plans are generated. The power supply plan takes the power supply point and the main power supply line as the starting point and the power-consuming device as the end point, and the power supply plan can meet the power demand of the power-consuming device. Multiple power supply plans are sorted and screened, and the most required power supply plan is used as the improvement measure for the corresponding cable.

[0040] In this application, by comparing multiple generated power supply schemes, it is possible to power multiple electrical devices with low line loss, saving energy. More importantly, the generated scheme is highly executable and has great reference value.

[0041] Compared with the transmission network, the topology of the distribution network will face more frequent changes. The main reasons include the following three aspects: First, since the distribution network is being transformed, expanded and upgraded every day, new substations, new lines, and new user loads often occur in the distribution system. Second, the distribution network is equipped with a large number of switches or knife switches. In order to ensure the flexibility of operation and the reliability of power supply, their opening and closing states will constantly change, thereby changing the connection relationship of the power devices accordingly. Third, the large-scale deployment of electric vehicle charging piles and the access of high-penetration and large-scale distributed power sources make the topology of the distribution network more and more complex. In addition, the topology identification of the distribution network system is of great significance to its fault line identification, flow calculation and distribution, and stability control. Therefore, it is particularly important to perform real-time and accurate topology identification of the distribution network system.

[0042] Theoretically, calculating the line loss of the distribution network is not a problem, but due to the time-varying nature of the load at each node in the actual system, the network flow distribution and network loss power have the characteristics of time-varying. Compared with the high-voltage transmission network, the low-voltage distribution network system is more complex and faces more difficulties in calculating the line loss.

[0043] Electricity and line loss rate are the core operating indicators of power grid enterprises. They are the most important data that directly reflect the income and cost of the power sector. In particular, the line loss rate indicator comprehensively reflects the losses in various links of power grid operation, and concentrates on the management level of various core businesses such as production, dispatching, and marketing. At present, a small number of literatures have given the abnormal analysis process and processing strategy of line loss rate from the perspective of management, but they lack quantitative analysis, and no corresponding mathematical model has been built and specific processing methods have been proposed.

[0044] The distribution network refers to a mesh power supply network consisting of multiple power supply lines, which is a large-scale power supply line. Optimizing the economic operation of the distribution network means reasonably adjusting the load current and operating voltage of the power supply network to minimize the load of the transformer at the power supply end of the power grid and the line loss of the power grid, thereby reducing the total loss of the entire power supply line. Through effective theoretical line loss calculation, the working voltage and current of the transformer at the power supply end can be reasonably adjusted based on the actual power demand of the power consumption area to achieve the purpose of reducing line loss.

[0045] In some embodiments of the line loss level evaluation method for power grid characteristic differences provided in the present application, the actual direction and laying route of the target cable are determined by combining relevant information and on-site detection, including:

[0046] The higher the level is in the topological relationship, the target level is set, and the actual laying conditions of the cables not less than the target level are determined respectively.

[0047] Line loss is inevitable in the process of power transmission. Due to the existence of line loss, there will be energy loss in the process of power transmission on the cable. After the power plant generates electricity, it needs to be transmitted through the transmission network. During the transmission process of the transmission network, the voltage needs to be increased by a transformer. Only through the above settings can the line loss be effectively reduced. After the transmission network is transmitted for a certain distance, it is transmitted to the distribution network through a transformer, and the distribution network transmits the electricity to the power-consuming equipment.

[0048] During transmission in the transmission network, the current value in the cable is lower due to the presence of the transformer. However, during power transmission in the distribution network, due to safety considerations, the voltage level on the distribution network is smaller and the current value is relatively larger. In addition, the total length of the distribution network in the city is longer, which leads to the line loss in the distribution network being greater than the line loss in the transmission network.

[0049] However, it should be pointed out that the overall structure of the distribution network is relatively complex. How to reduce line losses in the distribution network involves many factors and is relatively difficult.

[0050] In some embodiments of the line loss level evaluation method for power grid characteristic differences provided in the present application, the actual direction and laying route of the target cable are determined by combining relevant information and on-site detection, including:

[0051] Combined with the topological relationship, the line loss of each cable is monitored in real time, and the total line loss level is determined.

[0052] In order to evaluate the line loss of the current power transmission line, it is necessary to first determine the specific transmission paths of the transmission network and the distribution network, because only after the paths of the above-mentioned power grids are explored can the line loss of the current line be accurately determined. It should be pointed out that the structure of the transmission network is relatively simple, so the form and specific lines of the transmission network can be accurately determined through the construction data related to the transmission network and the data detected by the satellite.

[0053] The structure of the distribution network is more complex than that of the transmission network, and the line loss is also more serious. It is precisely for the above reasons that how to accurately explore the structure of the distribution network is a key issue. Therefore, for the distribution network, the structure of the current distribution network can be explored with the help of real-time identification of network topology relationships.

[0054] In some embodiments of the line loss level evaluation method for power grid characteristic differences provided in the present application, the actual direction and laying route of the target cable are determined by combining relevant information and on-site detection, including:

[0055] Create a spatial model of the cable and create structures to support and position the cable based on the model.

[0056] Restore the underground and above-ground conditions around cables and structures in proportion based on actual conditions.

[0057] After the topology of the distribution network is explored, the specific laying route of the distribution network needs to be determined. Although the topology can clarify the specific upper and lower layer relationship of the entire distribution network, the line loss is related to the material, length and deformation of the cable. In order to evaluate the line loss of the distribution network, it is necessary to determine the specific direction and length of the cables connecting the upper and lower levels. For the above reasons, it is necessary to determine the specific direction of the entire distribution network based on the network topology and relevant historical information and data.

[0058] In the embodiment, the distribution network direction to be determined not only needs to determine the specific structure of each cable but also needs to determine the current specification parameters of each cable, including the outer diameter, material, rust condition, hierarchical position in the network topology, and current internal resistance value of the cable. Because only when the above conditions are determined can the line loss status of the current distribution network be accurately and intuitively determined.

[0059] In order to achieve the above-mentioned technical effects, relevant personnel are required to collect relevant data and perform three-dimensional visualization of the distribution network, and conduct on-site inspections of different lines.

[0060] In some embodiments of the line loss level evaluation method for power grid characteristic differences provided in the present application, calibrating the location of the power supply point in the area and the actual direction of the main power supply line includes:

[0061] Detect the cable's outer diameter, material, rust condition, topology level and internal resistance.

[0062] The parameters of the model are set so that the model and the cable have the same line loss level under the same external conditions.

[0063] It should be pointed out that in actual application, it is not necessary to detect and measure the directions of all lines in the distribution network, because if the cable is located at a lower level in the network topology, then its internal current value is smaller and due to its shorter length, the corresponding line loss is also lower.

[0064] In order to reduce the workload and improve the efficiency of analysis, this application only needs to monitor the relevant parameters and operating status of cables with relatively higher levels to determine their specific direction and other parameters.

[0065] But more importantly, before conducting on-site monitoring of the corresponding cables, it is necessary to clarify the number and corresponding locations of the electrical equipment connected to them, because only after the above information is clear can the corresponding cables be optimized in a targeted manner in accordance with actual requirements.

[0066] In some embodiments of the line loss level evaluation method for power grid characteristic differences provided in the present application, the actual direction and laying route of the target cable are determined in combination with relevant information and on-site detection, and the line loss of the cable is determined including:

[0067] Real-time detection of cable parameters during power transmission to determine cable line loss and the reasons for changes in line loss.

[0068] After monitoring the cables at a higher level, the parameters of the cables can be determined. The purpose of this application is to reduce the internal line loss of the cables at a higher level by improving them, and ultimately achieve the goal of saving energy. To this end, it is necessary to monitor the operation status of the cables in real time. The ultimate goal is to generate corresponding improvement measures by analyzing the current line loss.

[0069] In order to achieve the above-mentioned technical effects, in this application, it is necessary to install corresponding metering devices on the cables that need to be improved, and determine the parameter information such as voltage, current and resistance of the current cable through the metering devices. After the above-mentioned parameter information is determined, the line loss situation on the cable can be determined. After the line loss situation is determined, a solution to reduce the line loss of the cable can be generated accordingly.

[0070] In some embodiments of the line loss level evaluation method for grid characteristic differences provided in the present application, taking the most required power supply scheme as the improvement measure for the corresponding cable includes:

[0071] Make an overall evaluation of the line loss level of the distribution network.

[0072] If the internal resistance of the cable is large, replace it with a material with lower internal resistance to reduce the line loss level.

[0073] On the basis of meeting the power supply requirements, shorten the cable length appropriately.

[0074] Integrate cables with different directions to reduce the overall line loss.

[0075] In order to achieve the technical effect of reducing line loss, one method is to replace some cables, that is, to replace cables with relatively large internal resistance with materials with smaller internal resistance. The above-mentioned improvement method can significantly reduce the line loss level, thereby reducing the waste of resources.

[0076] Another method is to optimize the existing distribution network structure, that is, to analyze the unreasonable sections in the current distribution network, and then re-plan some routes based on scientific planning routes. The main principle of planning is to reduce the length of the entire line and avoid unnecessary and redundant line laying, and the above method is used to achieve line loss.

[0077] The last method is to integrate the existing lines by adjusting the number and position of transformers and integrating the existing cable laying lines. It should be pointed out that after integration, the voltage needs to be appropriately increased to avoid the problem of serious line loss due to the increase in current. For this purpose, the transformer can be used to increase the voltage and reduce the current value of the cable.

[0078] In some embodiments of the line loss level evaluation method for grid characteristic differences provided in the present application, taking the most required power supply scheme as the improvement measure for the corresponding cable includes:

[0079] Based on the cable improvement measures, the cable line loss before and after the improvement and the total line loss level of the distribution network are calculated.

[0080] For a more detailed explanation, the grid topology is first integrated with the actual detected distribution network data to identify the cables at a higher level and their actual directions. At the same time, the network topology can be used to determine the scope of power supply, that is, to determine which electrical equipment the cable is currently supplying power to.

[0081] When the above conditions are determined, it is necessary to combine the relevant metering devices to determine the operating status of each cable. When the operating status is determined, the corresponding line loss can also be obtained. After the line loss is determined, it is necessary to determine what material cable to use for replacement based on the relevant information provided by the database, etc., so as to improve the current line loss situation.

[0082] Not only can materials be replaced, but the present application also requires changing the structure of the current distribution network, that is, re-planning the route of the distribution network. Based on the above reasons, it is first necessary to clarify the specific location of each electrical equipment, and then infer the main location of the upper power supply cable, and clarify multiple currently feasible power supply points, so as to re-plan the power supply route.

[0083] In some embodiments of the line loss level evaluation method for grid characteristic differences provided in the present application, taking the most required power supply scheme as the improvement measure for the corresponding cable includes:

[0084] During the simulation, a transformer is added to increase the voltage in the cable and reduce line losses.

[0085] The power consumption of each electrical equipment is set to a fixed value. On the basis of meeting the power consumption of each electrical equipment, lines connecting the power supply point, the main power supply line and the electrical equipment are randomly generated. Some sections of lines with the same direction are integrated, and the current and resistance values ​​in the integrated lines are determined, thereby determining the line loss situation.

[0086] In order to explain in more detail, we first construct a rough distribution map of the entire area. Once the distribution map is determined, the location of each electrical equipment and the locations of multiple available power supply points in the surrounding area are marked. Once the above situation is determined, in order to save renovation costs while ensuring the normal construction of the entire improvement project, the existing buildings and towers used to support power supply facilities can be marked on the map.

[0087] When all known conditions are determined, multiple power supply plans are generated in the host computer on the basis of meeting the power requirements of each electrical equipment. With the help of the host computer's computing power, the corresponding line loss, laying length, transformation area and improvement cost are determined. Through the above multiple simulations, multiple feasible technical solutions can be generated, and then a feasible target route can be determined through screening.

[0088] In the actual application process, it is necessary to ensure that the power provided by the power supply point can supply power to multiple electrical devices. More importantly, it is necessary to achieve power transmission without affecting normal traffic and aesthetics. Based on the above reasons, basic principles need to be followed in the process of simulating the power transmission route in the host computer.

[0089] It should be pointed out that, through the above-mentioned improvements, the electrical equipment belonging to a unit or company may no longer be powered by one power supply line, because only in this way can the line loss be minimized.

[0090] In some embodiments of the line loss level evaluation method for grid characteristic differences provided in the present application, taking the power supply point and the main power supply line as the starting point and the power consumption equipment as the end point, generating multiple power supply schemes that meet the demand conditions includes:

[0091] The differences in the actual cable routes before and after the improvement measures were compared, and the degree of change in the cable support and positioning method after the improvement was analyzed.

[0092] Based on the line loss level and transformation cost, multiple power supply solutions are screened.

[0093] How to reduce the line loss of the current distribution network is the ultimate goal. Based on the above reasons, through multiple schemes simulated in the host computer, the generated schemes are sorted in the host computer according to the principle of minimum line loss. After the sorting is completed, the schemes that do not meet the requirements can be eliminated according to the actual situation of the current urban distribution and the basic principles of the line. Finally, several alternative schemes that meet the basic requirements will be obtained.

[0094] After the alternative plan is determined, the current actual situation is compared with the alternative plan. By comparing the differences, the corresponding improvement methods and routes are determined, and finally the optimization of distribution network line losses is completed.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A line loss level evaluation method for power grid characteristic differences, characterized in that: include: Determine the upper and lower hierarchical relationships of the distribution network based on the topological relationship, determine the actual direction and laying route of the target cable in combination with relevant data and on-site detection, and determine the line loss of the cable; determine the location of each major power-consuming device in the area, calibrate the location of the power supply point in the area and the actual direction of the main power supply line; infer the power demand of each power-consuming device based on historical data, and generate multiple power supply plans that meet the demand with the power supply point and the main power supply line as the starting point and the power-consuming device as the end point; The plurality of power supply schemes are sorted and screened based on line loss, transformation cost and construction period, and the power supply scheme with the highest requirements is used as the improvement measure corresponding to the cable.

2. The method for evaluating line loss level of power grid characteristic differences according to claim 1, characterized in that: The actual direction and laying route of the target cable determined by combining relevant information and on-site testing includes: The higher the level in the topological relationship, the higher the target level is set, and the actual laying conditions of the cables that are not less than the target level are determined respectively.

3. The method for evaluating line loss level of power grid characteristic differences according to claim 1, characterized in that: The actual direction and laying route of the target cable determined by combining relevant information and on-site testing includes: In combination with the topological relationship, the line loss of each cable is monitored in real time, and the total line loss level is determined.

4. The method for evaluating line loss level of power grid characteristic differences according to claim 1, characterized in that: The actual direction and laying route of the target cable determined by combining relevant information and on-site testing includes: Creating a spatial model of the cable and creating a structure for supporting and positioning the cable based on the model; The underground and above-ground conditions around the cables and the structure are restored in proportion according to the actual situation.

5. The method for evaluating line loss level of power grid characteristic differences according to claim 4, characterized in that: Determining the location of the power supply point in the area and the actual direction of the main power supply line includes: Detecting the outer diameter, material, rust condition, level in the topology structure and internal resistance value of the cable; The parameters of the model are set so that the model and the cable have the same line loss level under the same external conditions.

6. The method for evaluating line loss level of power grid characteristic differences according to claim 1, characterized in that: The actual direction and laying route of the target cable are determined by combining relevant data and on-site testing, and the line loss of the cable is determined, including: The parameters of the cable during the power transmission process are detected in real time to determine the line loss of the cable and the reasons causing the change in the line loss.

7. The method for evaluating line loss level of power grid characteristic differences according to claim 1, characterized in that: The improvement measures corresponding to the cable with the most required power supply scheme include: Conducting an overall evaluation of the line loss level of the distribution network; If the internal resistance of the cable is large, replace it with a material with a lower internal resistance to reduce the line loss level; On the basis of meeting the power supply requirements, the length of the cable is appropriately shortened; The cables with different directions are integrated to reduce the overall line loss value.

8. The method for evaluating line loss level of power grid characteristic differences according to claim 7, characterized in that: The improvement measures corresponding to the cable with the most required power supply scheme include: Based on the improvement measures for the cable, the line loss of the cable before and after the improvement and the total line loss level of the distribution network are calculated.

9. The method for evaluating line loss level of power grid characteristic differences according to claim 8, characterized in that: The improvement measures corresponding to the cable with the most required power supply scheme include: During the simulation, a transformer is added to increase the voltage in the cable so as to reduce line loss; The power consumption of each of the electrical devices is set to a fixed value. On the basis of meeting the power consumption of each of the electrical devices, lines connecting the power supply point and the main power supply line with the electrical devices are randomly generated, and some section lines with the same direction are integrated to determine the current value and resistance value in the integrated lines, thereby determining the line loss situation.

10. The method for evaluating line loss level of power grid characteristic differences according to claim 9, characterized in that: The generating of multiple power supply schemes that meet the demand conditions with the power supply point and the main power supply line as the starting point and the power-consuming device as the end point comprises: Compare the differences in the actual cable directions before and after the improvement measures, and analyze the degree of change in the cable support and positioning method after the improvement; Based on the line loss level and transformation cost, multiple power supply schemes are screened.

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