Method and system for improving operation efficiency of power distribution system

Abstract

The invention provides a power distribution system operation efficiency improving method and system, and relates to the field of data processing systems or methods, and the method comprises the steps: obtaining a first type of transformer substation main transformer meeting a light load condition in a first preset region; obtaining a target substation main transformer meeting a heavy load condition in a second preset range by taking each first type of substation main transformer as a center; if the main transformer of the target transformer substation and the main transformer of the first type of transformer substation conform to the exchange condition, the placement positions of the two are exchanged to obtain a light load exchange plan; obtaining a second type of transformer substation main transformer meeting the heavy load condition in the first preset area; determining the main transformer capacity increase of each second type of transformer substation main transformer according to the historical load data and the local power demand plan, and obtaining a heavy load capacity increase plan; and generating a power distribution system operation efficiency improvement scheme according to the light load exchange plan and the heavy load capacity increase plan. By implementing the method, the utilization efficiency of power grid equipment can be improved, the overload risk is reduced, and resource configuration is optimized.

Description

Technical Field

[0001] The present application relates to the field of data processing systems or methods, and in particular to a method and system for improving the operating efficiency of a power distribution system. Background Art

[0002] With the rapid development of social industry, the demand for electricity is growing. In some places with vast territory and sparse population, due to different economic foundations, load distribution and load development levels, with the continuous improvement of social and economic levels in recent years, the migration and aggregation of population, the load distribution of high-voltage substation equipment in these places is unbalanced, and the problem of light and heavy overload of equipment is widespread in various districts and counties.

[0003] In the related technologies, the management of the distribution system is mainly based on the historical load data of the main transformers of the substations in each region, and the future load of the main transformers is predicted, and then the capacity increase of the main transformers of the substations in each region and the replacement plan of the main transformers of the substations in each region are determined.

[0004] However, the load forecasting of the main transformers of substations in various regions based only on historical load data has a certain lag in the forecast results, which makes it difficult for the replacement plan determined based on the forecast results to cope with the local variable electricity demand in the future, resulting in the coexistence of light and heavy overloads in the main transformers of local substations, resulting in low utilization efficiency of power grid equipment. Summary of the invention

[0005] The present application provides a method and system for improving the operating efficiency of a power distribution system, which is used to solve the problem that light and heavy overloads coexist in the current power distribution system, resulting in low utilization efficiency of power grid equipment.

[0006] In a first aspect, the present application provides a method for improving the operating efficiency of a power distribution system, which is applied to a power distribution system, and the method comprises: Obtain a first-category substation main transformer that meets the light-load condition in a first preset area; Taking each of the first-type substation main transformers as the center, obtaining a target substation main transformer that meets the heavy load condition within a second preset area, where the second preset area is smaller than the first preset area; If there is a main transformer of the target substation that meets the exchange conditions with the main transformer of the first type of substation, the positions of the two are exchanged to obtain a light load exchange plan; Obtain a second type substation main transformer that meets the heavy load condition in the first preset area; Determine the capacity increase of each main transformer of the second type substation based on historical load data and local power demand planning, and obtain a heavy load capacity increase plan; A distribution system operation efficiency improvement plan is generated based on the light-load replacement plan and the heavy-load capacity expansion plan.

[0007] Through the above embodiment, the distribution system first exchanges the main transformer of the light-load substation with the main transformer of the heavy-load substation that meets the exchange conditions, and then increases the capacity of the main transformer of the heavy-load substation that has not been exchanged according to the local historical load data and power demand planning, thereby improving the utilization efficiency of the power grid equipment, reducing the risk of overload, and optimizing resource allocation.

[0008] In some embodiments, before the step of swapping the positions of the target substation main transformer and the first type substation main transformer if they meet the swap condition to obtain a light load swap plan, the method further includes: Determine the main transformer capacity of the main transformer of the first type substation; Obtain the historical load data of the main transformer of the target substation and the local power demand plan; Determine the main transformer capacity requirement based on the historical load data and local power demand planning; Determine whether the conditions for exchange between the main transformer capacity and the main transformer capacity requirement are met.

[0009] Through the above embodiment, before executing the main transformer replacement, the distribution system first determines the capacity of the main transformer of each substation and the capacity demand based on historical load data and power demand planning, and judges whether the replacement conditions are met based on this, thereby ensuring the practical applicability and accuracy of the replacement plan.

[0010] In some embodiments, the step of determining whether the main transformer capacity and the main transformer capacity requirement meet the replacement condition includes: Obtaining the service life and equipment specifications of the main transformer of the first type substation and the main transformer of the target substation, wherein the service life is used to determine whether the two are aging equipment, and the equipment specifications are used to determine whether the two are compatible; If it is detected that the two are incompatible or one of them is an aged device, it is determined that the two do not meet the conditions for exchange; If it is detected that the two are compatible and neither is an aged device, then it is determined that the two meet the conditions for exchange.

[0011] Through the above embodiments, the power distribution system determines whether the main transformers of two substations meet the replacement conditions based on service life and compatibility, thereby reducing the risk of failure caused by equipment aging or specification mismatch, and additional replacement costs.

[0012] In some embodiments, the step of acquiring a target substation main transformer that meets the heavy load condition within a second preset range with each of the first-type substation main transformers as the center specifically includes: Constructing a digital model of the power grid topology of the first preset area according to the location of each main transformer of the substation in the first preset area and the corresponding transmission line; Based on the digital model of the power grid topology, the minimum spanning tree algorithm is used to calculate the optimal transmission path between the main transformer of the first type of substation and the main transformer of the target substation, and the transmission path set is obtained; According to the transmission path set and the historical load data of the main transformer of the target substation, the power flow distribution of each optimal transmission path is calculated to obtain the power flow distribution data; Based on the power flow distribution data, the stability index of the optimal transmission path is calculated. The stability index includes the voltage stability margin and power transmission margin corresponding to the main transformer of the target substation; The target substation main transformer is screened based on the stability index, and the target substation main transformer that meets the preset stability index is determined as the target substation main transformer that meets the replacement conditions.

[0013] Through the above-mentioned embodiments, the distribution system calculates the optimal transmission path between the main transformer of the first type of substation and the main transformer of the target substation by constructing a digital model of the power grid topology and combining the minimum spanning tree algorithm, thereby avoiding the power grid stability risk that may be caused by replacing the main transformer based only on geographical distance in the traditional method. At the same time, by calculating the power flow distribution of the optimal transmission path and introducing the voltage stability margin and power transmission margin as stability indicators, the impact of the main transformer replacement on the power grid operation can be comprehensively evaluated to ensure that the selected target substation main transformer can solve the light and heavy load problems after replacement, and can ensure the safe and stable operation of the power grid. This multi-dimensional evaluation method based on power grid topology and power flow analysis makes the main transformer replacement plan more scientific and reliable, and can better solve the problem of coexistence of light and heavy overloads in the power distribution system, and improve the utilization efficiency of power grid equipment.

[0014] In some embodiments, the step of determining the main transformer capacity increase of each main transformer of the second type substation according to the historical load data and the local electricity demand plan to obtain the heavy load capacity increase plan specifically includes: Obtain historical load data of the main transformer of the second type substation within a preset time range to obtain the historical load average; Obtain relevant documents on local development planning and determine the electricity demand planning for local projects to be built; The main transformer capacity increase of the second type substation main transformer is determined according to the historical load average and the power demand plan, and a heavy load capacity increase plan is obtained.

[0015] Through the above embodiments, the power distribution system determines the future load capacity according to the historical load average and the local development plan, and then obtains the heavy load capacity expansion plan, so that the capacity expansion plan can effectively cope with the future power consumption growth, ensure the stability and reliable power supply of the power grid, and adapt to the changes in regional economic development and power demand.

[0016] In some embodiments, after the step of determining the capacity increase of each main transformer of the second type substation according to the historical load data and the local power demand plan to obtain the heavy load capacity increase plan, the step further includes: Obtaining location information of each main transformer of the second type substation; A third type of substation main transformer is determined from the second type of substation main transformers according to the location information and the corresponding main transformer capacity increase, and the capacity increase ratio of the third type of substation main transformer is higher than the capacity increase ratio of the second type of substation main transformer.

[0017] Through the above embodiment, the distribution system obtains location information and analyzes the capacity increase ratio of the main transformer to determine the third-type substation main transformer that needs additional capacity increase, so as to share the power consumption pressure for other adjacent areas in an emergency.

[0018] In some embodiments, after the step of determining the main transformer capacity increase of each second-type substation main transformer according to the historical load data and the local power demand plan to obtain the heavy load capacity increase plan, the step further includes: Obtain equipment parameters and historical operation data of the main transformer of the first type substation, the main transformer of the target substation, and the main transformer of the second type substation; Based on equipment parameters and historical operation data, calculate the equipment correlation index between the main transformer of the first type of substation and the main transformer of the target substation, and the load correlation index between the main transformer of the target substation and the main transformer of the second type of substation; Perform weighted calculation on the equipment correlation index and the load correlation index to obtain the system comprehensive correlation degree; Based on the comprehensive correlation of the system, a butterfly effect propagation model is established, and the system impact is obtained by calculating the impact of load transfer and voltage distribution; Based on the system impact, the light-load replacement plan and heavy-load capacity expansion plan are prioritized to generate the optimal implementation order.

[0019] Through the above-mentioned embodiments, the distribution system comprehensively considers the matching relationship between the main transformers of different types of substations by introducing the calculation of equipment-related indicators and load-related indicators, and obtains the comprehensive correlation of the system through weighted calculation, which provides a quantitative basis for the overall evaluation of the replacement and capacity increase of the main transformer. In particular, by establishing a butterfly effect propagation model, the chain reaction of the replacement and capacity increase of the main transformer on the load distribution and voltage level of the power grid can be predicted, thereby obtaining the system impact, avoiding the problem of local optimization that may occur in traditional solutions and causing overall performance degradation. Prioritizing light-load replacement plans and heavy-load capacity increase plans based on the system impact not only ensures the coordination of various transformation measures, but also ensures a smooth transition in the implementation process. It can more effectively solve the problem of coexistence of light and heavy overloads in the power grid and achieve an overall improvement in the utilization efficiency of power grid equipment.

[0020] In a second aspect, the present application provides a power distribution system, the power distribution system comprising: one or more processors and a memory; The memory is coupled to the one or more processors, and the memory is used to store computer program code, which includes computer instructions. The one or more processors call the computer instructions so that the power distribution system can implement a method for improving the operating efficiency of a power distribution system provided in the above-mentioned embodiment, which will not be repeated here.

[0021] In a third aspect, the present application provides a computer-readable storage medium, including instructions. When the instructions are executed on a power distribution system, the power distribution system can implement a method for improving the operating efficiency of a power distribution system provided in the above-mentioned embodiment, which will not be repeated here.

[0022] In a fourth aspect, the present application provides a computer program product. When the computer program product runs on a power distribution system, the power distribution system can implement a method for improving the operating efficiency of a power distribution system provided in the above-mentioned embodiment, which will not be repeated here.

[0023] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. The distribution system replaces the qualified light-load substation main transformers with the heavy-load substation main transformers, and then increases the capacity of the heavy-load substation main transformers that have not been replaced based on local historical load data and power demand planning. The combination of replacement and capacity increase strategies not only improves the utilization efficiency of power grid equipment, but also effectively reduces the overload risk and optimizes resource allocation.

[0024] 2. The distribution system calculates the optimal transmission path between the main transformer of the first type of substation and the main transformer of the target substation by constructing a digital model of the power grid topology and combining it with the minimum spanning tree algorithm, thus avoiding the grid stability risk that may be caused by replacing the main transformer based only on geographical distance in the traditional method. At the same time, by calculating the power flow distribution of the optimal transmission path and introducing the voltage stability margin and power transmission margin as stability indicators, the impact of the main transformer replacement on the grid operation can be comprehensively evaluated to ensure that the selected target substation main transformer can solve the light and heavy load problems after replacement, and ensure the safe and stable operation of the grid. This multi-dimensional evaluation method based on power grid topology and power flow analysis makes the main transformer replacement plan more scientific and reliable, and can better solve the problem of coexistence of light and heavy overloads in the power distribution system, and improve the utilization efficiency of power grid equipment.

[0025] 3. The distribution system comprehensively considers the matching relationship between main transformers of different types of substations by introducing the calculation of equipment-related indicators and load-related indicators, and obtains the comprehensive correlation of the system through weighted calculation, providing a quantitative basis for the overall evaluation of main transformer replacement and capacity increase. In particular, by establishing a butterfly effect propagation model, the chain reaction of main transformer replacement and capacity increase on the load distribution and voltage level of the power grid can be predicted, thereby obtaining the system impact, avoiding the problem of overall performance degradation caused by local optimization that may occur in traditional solutions. Prioritizing light-load replacement plans and heavy-load capacity increase plans based on system impact not only ensures the coordination of various transformation measures, but also ensures a smooth transition in the implementation process. It can more effectively solve the problem of coexistence of light and heavy overloads in the power grid and achieve an overall improvement in the utilization efficiency of power grid equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a method for improving the operating efficiency of a power distribution system in an embodiment of the present application; Figure 2 is another flow chart of a method for improving the operating efficiency of a power distribution system in an embodiment of the present application; Figure 3 This is a schematic diagram of an exemplary scenario of the division of the first preset area and the second preset area in an embodiment of the present application; Figure 4 It is a schematic diagram of the structure of a physical device of the power distribution system in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations comprising one or more listed items.

[0028] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0029] For ease of understanding, the following is a flow chart of the method provided in this implementation. Figure 1The figure is a flow chart of a method for improving the operating efficiency of a power distribution system in an embodiment of the present application.

[0030] S101. Obtain a main transformer of a first type substation that meets a light load condition in a first preset area.

[0031] The power distribution system first defines an area including multiple substation main transformers as the first preset area (such as a province or county). The demarcation of this area can be determined based on a variety of factors such as administrative divisions, geographical locations, and power grid structures, which are not limited here.

[0032] After determining the first preset area, the power distribution system collects the operation data of all substations in the area, especially the real-time load conditions of the substation main transformers. By analyzing these data, the power distribution system selects the substation main transformers that meet the light load conditions and classifies them as the first type of substation main transformers.

[0033] Among them, the main transformer of the substation that meets the light load conditions has been in operation for more than 3 years and the average load rate is less than 10%.

[0034] S102: Taking each first-category substation main transformer as the center, obtain a target substation main transformer that meets the heavy load condition within a second preset range.

[0035] After identifying the first type of light-load substation main transformer, the distribution system further determines the specific replacement object of each light-load main transformer. Specifically, the distribution system defines a second preset range with the geographical location of each first type of substation main transformer as the center, and searches for other substation main transformers that meet the heavy-load conditions within the second preset range as the replacement target.

[0036] The second preset range is smaller than the first preset range, and is usually centered on the main transformer of the first type of substation, and a suitable selection radius is determined by considering factors such as equipment transportation conditions, power grid structure, and geographical environment. Of course, administrative regions can also be directly used as the division method of the second preset range, which is not limited here.

[0037] In addition, the main transformer of the substation that meets the heavy load conditions is opposite to the main transformer of the substation that meets the light load conditions. Its commissioning time is greater than 3 years, and its maximum load rate is greater than 70%, and its average load rate is greater than 30%.

[0038] Furthermore, the distribution system collects the geographic location information of all substation main transformers in the first preset area, as well as the transmission line information connecting them. The geographic location information is accurate to longitude and latitude, and the transmission line information includes line length, conductor model, resistance, reactance and other parameters. Based on this data, the distribution system uses graph theory and topology principles to abstract each substation main transformer into a node and the transmission line into an edge connecting the nodes, and builds a digital model that can reflect the grid structure and electrical connection relationship.

[0039] Next, the main transformer of the first type of substation is set as the starting node, and the main transformer of the target substation is set as the end node. The minimum spanning tree algorithm starts from the starting node, compares the weights of each edge (the weight is usually determined based on the length, resistance, reactance and other parameters of the transmission line, and the weight of the line with small resistance and reactance and short length is low), selects the edge with the smallest weight to connect the nodes in sequence until all the main transformer nodes of the target substation are included, and a minimum spanning tree is formed. The path in the tree is the optimal transmission path. Then, the flow path of the current is determined according to the set of transmission paths, and the historical load data of the main transformer of the target substation (including active power and reactive power requirements in different periods) is combined with the power flow calculation method (such as Newton-Raphson method) for calculation. These methods are based on the basic equations of the power system (such as the power flow equation and the node voltage equation), and the voltage amplitude and phase angle of each node are obtained by iterative solution, and then the active power and reactive power distribution on each transmission path, that is, the power flow distribution data, is calculated.

[0040] For the voltage stability margin, the distribution system calculates it through a specific formula based on the node voltage amplitude in the power flow distribution data. For example, a common method is to calculate the distance from the current operating point to the critical point of voltage collapse. The larger the distance, the higher the voltage stability margin. For the power transmission margin, it is calculated based on the active power and reactive power transmission conditions in the power flow distribution data, combined with parameters such as the thermal stability limit and transient stability limit of the line. The distribution system pre-sets the thresholds for the voltage stability margin and the power transmission margin, which are determined according to the actual operation requirements and safety standards of the power grid. The calculated stability index corresponding to the main transformer of each target substation is compared with the preset threshold. Only when the voltage stability margin is greater than or equal to the preset voltage stability margin threshold, and the power transmission margin is greater than or equal to the preset power transmission margin threshold, the main transformer of the target substation is judged to meet the preset stability index and meet the replacement conditions.

[0041] S103. If there is a main transformer of the target substation and a main transformer of the first type substation that meet the replacement conditions, the positions of the two are swapped to obtain a light load replacement plan.

[0042] After determining the potential replacement targets for each light-load main transformer, the distribution system further evaluates whether they meet the replacement conditions. Specifically, the distribution system compares the capacity specifications of the light-load main transformer and the target main transformer. Only when the capacity of the light-load main transformer meets the power demand of the area where the heavy-load main transformer is located, and the capacity of the heavy-load main transformer also meets the power demand of the area where the light-load main transformer is located, can it be determined that the heavy-load main transformer and the light-load main transformer can be replaced, and the positions and numbers of the heavy-load main transformer and the light-load main transformer are combined and recorded to obtain a light-load replacement plan.

[0043] In addition, the replacement conditions must also consider the service life of the two main transformers. Generally speaking, it is not advisable to replace old main transformers with newly commissioned main transformers, because old equipment may have safety hazards, and frequent migration will increase the risk of failure. The ideal replacement method is to carry out replacement between main transformers with similar service life and technical status.

[0044] S104: Obtain a main transformer of a second type substation that meets the heavy load condition in the first preset area.

[0045] If there is a target substation main transformer and a first-category substation main transformer that meet the replacement conditions, after executing step S103, the heavy-load main transformer confirmed as the light-load replacement plan will be excluded in the first preset area, and the second-category substation main transformer that meets the heavy-load conditions will be obtained again. The specific screening process is the same as the principle of step S101 and will not be repeated here.

[0046] S105. Determine the capacity increase of the main transformer of each second-category substation based on historical load data and local electricity demand planning to obtain a heavy-load capacity increase plan.

[0047] After identifying the main transformers of the second-class heavy-load substation, the distribution system further determines the specific capacity expansion plan for each main transformer and formulates a complete heavy-load capacity expansion plan. Specifically, the distribution system collects and organizes the historical operation data of the main transformers of the second-class substation, especially the daily and hourly load data of the past 3-5 years. By statistically analyzing the massive data, the load characteristics of the substation can be accurately evaluated, including load rate, load curve, peak-to-valley difference, seasonal changes, etc., to determine its current power supply capacity and the capacity difference required by the main transformer.

[0048] Based on the load data analysis, the load forecast is also carried out for the current area (the area covered by the main transformer responsible for power supply). Specifically, the distribution system reads the information uploaded by relevant technical personnel or the documents released on the official website platform, and obtains the new power demand in a certain period of time in the future from the industry development plan, key project construction plan, new power application and other document information, and then determines the main transformer capacity increase by combining the current power supply capacity of the main transformer and the capacity difference required by the main transformer. Similarly, the main transformer capacity increase of other second-type substation main transformers is obtained, and the heavy load capacity increase plan in the first preset area is integrated.

[0049] For example, in a specific embodiment, the heavy-load capacity expansion plan of a certain substation is: to expand and transform the No. 1 and No. 2 main transformers, and increase the original 2*50 MVA main transformer capacity to 2*63 MVA, with a voltage level of 110 / 35 / 10 kV.

[0050] S106. Generate a distribution system operation efficiency improvement plan based on the light-load replacement plan and the heavy-load capacity expansion plan.

[0051] After the light-load replacement plan and heavy-load capacity increase plan are formulated, the distribution system combines the two types of optimization measures to form a complete operation efficiency improvement plan. Specifically, the distribution system establishes a ledger for all substations involved in light-load replacement and heavy-load capacity increase, and clarifies the current status, target status and optimization path of each substation main transformer. On this basis, combined with the geographical distribution of substations and their power supply areas, as well as the actual conditions of power grid currents and network losses, the timing arrangement of optimization and adjustment of each substation is determined to avoid power supply risks caused by the simultaneous construction of adjacent substations.

[0052] In the above embodiment, the power distribution system first exchanges the main transformer of the light-load substation that meets the exchange conditions with the main transformer of the heavy-load substation, and then increases the capacity of the main transformer of the heavy-load substation that has not been exchanged based on the local historical load data and power demand planning, thereby improving the utilization efficiency of the power grid equipment, reducing the risk of overload, and optimizing resource allocation.

[0053] Furthermore, the distribution system can also collect relevant data from multiple data sources. For example, equipment parameters can be obtained by reading the equipment files of the substation and checking the equipment nameplate. These parameters include the rated capacity and voltage level of the main transformer. Historical operation data is obtained from the power monitoring system and the Supervisory Control and Data Acquisition (SCADA), including real-time operation data such as active power and reactive power in different time periods, as well as equipment start and stop records, fault records, etc.

[0054] The equipment association index is determined by comparing the equipment parameters of the main transformer of the first type of substation and the main transformer of the target substation. For example, the capacity matching degree can be calculated by the ratio of the rated capacities of the two; the voltage level compatibility is calculated. If the voltage levels are exactly the same, the compatibility is 1, and if they are different, the corresponding compatibility value is assigned according to the degree of difference; the matching of parameters such as short-circuit impedance, winding connection method, and cooling method can also be considered, and the equipment association index is determined by combining these factors. For load association index, the load characteristics in the historical operation data of the main transformer of the target substation and the main transformer of the second type of substation can be analyzed. To calculate the similarity of the load curves of the two, the correlation analysis method can be used to calculate the correlation coefficient of the active power and reactive power change curves in different time periods; the consistency of the load rate change trend can also be analyzed to determine the load association index.

[0055] Next, the distribution system determines the weights of the equipment-related indicators and the load-related indicators according to the actual situation. The weights can be determined based on expert experience, the analysis results of historical operation data, and the key requirements of power grid operation. For example, if the current power grid pays more attention to equipment compatibility, the weight of the equipment-related indicators can be appropriately increased; if more attention is paid to load balance, the weight of the load-related indicators can be increased. After the weights are determined, the comprehensive correlation of the system is calculated according to the weighted calculation formula.

[0056] Then the distribution system establishes a butterfly effect propagation model based on the comprehensive correlation of the system. The model is based on the basic principles of the power system, such as Kirchhoff's current law and voltage law. Specifically, the input parameters of the model are determined, including the equipment parameters, operation data, and comprehensive correlation of the system of each substation main transformer. Then the main transformer replacement or capacity increase operation is simulated to analyze the transfer of load in the power grid. For example, when the main transformer of the first type of substation is replaced with the main transformer of the target substation, the redistribution of current is calculated according to the grid topology and line parameters, and then the load change of each node is obtained. At the same time, considering the impact of load change on voltage distribution, the changes in voltage amplitude and phase angle of each node are calculated by power flow calculation methods (such as Newton-Raphson method). The system impact is determined by comprehensively considering the changes in load transfer and voltage distribution.

[0057] Finally, the distribution system uses the calculated system impact as an important basis to prioritize the light-load replacement plan and heavy-load capacity expansion plan. Plans with less system impact are implemented first because they have relatively less impact on grid operation and lower risks during implementation.

[0058] The following is a more detailed description of the process of the method provided by this embodiment. Figure 2 As shown, it is another flow chart of a method for improving the operating efficiency of a power distribution system in an embodiment of the present application.

[0059] S201. Determine the main transformer capacity of the main transformer of the first type substation.

[0060] After screening out the main transformers of the first type of light-load substations, the distribution system further determines the capacity specifications of each main transformer. Among them, the main transformer capacity refers to the actual power that the transformer can continuously output under rated conditions, in kilovolt-amperes (kVA) or megavolt-amperes (MVA). The distribution system can determine its capacity by querying the equipment files of the substation and obtaining the nameplate parameters of the main transformer. For example, the nameplate of a light-load main transformer is marked as "S9-31500 / 110", where "31500" means the rated capacity is 31500kVA, or 31.5MVA.

[0061] S202: Obtain historical load data of the main transformer of the target substation and local power demand planning.

[0062] In the first preset area, the distribution system demarcates a second preset area (such as a 50-kilometer radius around the substation) with the substation where each first-class light-load substation main transformer is located as the center, and identifies one or more target substation main transformers that meet the heavy-load conditions in this area. Next, the distribution system obtains the historical load data of each target substation main transformer and the power demand development plan of the location. Among them, the historical load data reflects the actual power consumption of the main transformer in the past period of time (such as 3 to 5 years), including parameters such as the maximum load, average load, and load rate year by year or month. The local power demand plan reflects the impact of factors such as economic development, population growth, and industrial layout in the region on future power demand. Planning documents are usually compiled by local official departments and have a relatively accurate forecast of the new power load in a certain period of time.

[0063] For example, in one embodiment, the power distribution system found through statistical analysis that the average annual maximum load of a certain heavy-load main transformer in the area has increased from 21 million kWh to 28 million kWh in the past three years, a year-on-year increase of 15%. The latest local power plan predicts that by 2025, two large industrial parks will be added in the area, with an annual power consumption of more than 500 million kWh. Based on this, the power demand of the main transformer in the next five years can be determined.

[0064] S203. Determine the main transformer capacity requirement based on historical load data and local electricity demand planning.

[0065] Specifically, the power distribution system can use a weighted average method to assign different weights to historical data and planned data to calculate the main transformer capacity demand. The weight coefficient can be determined based on factors such as the reliability and timeliness of the data, which are not limited here.

[0066] For example, in a specific embodiment, historical data from the past five years show that the average annual maximum load of a main transformer has increased from 15 million kWh to 22 million kWh, with an average annual compound growth rate of 8%. The load forecast based on historical data is: 2200×(1+8%)^5=3131 (million kWh). Furthermore, the local plan predicts that the annual electricity consumption in the area will increase by 18 million kWh by 2025. Assuming that the additional amount is shared by the main transformer and another main transformer in the vicinity, with a sharing ratio of 6:4, the main transformer will also need to add a new load: 1800×60%=10.8 million (million kWh). Taking the weight of the predicted value of historical data as 0.6 and the weight of the predicted value of planned data as 0.4, the expected maximum load of the main transformer by 2025 is: 3131×0.6+1080×0.4=2311 (10,000 kWh), and then calculating the capacity demand of the main transformer to be 48.15MVA (assuming the load rate is 60%).

[0067] In the above embodiment, before executing the main transformer replacement, the distribution system first determines the capacity of the main transformer of each substation and the capacity demand based on historical load data and power demand planning, and judges whether the replacement conditions are met based on this, ensuring the practical applicability and accuracy of the replacement plan.

[0068] S204. Obtain the service life and equipment specifications of the main transformer of the first-category substation and the main transformer of the target substation.

[0069] After determining the capacity matching degree of the light-load main transformer and the heavy-load main transformer, the distribution system further determines whether they meet the replacement conditions. Specifically, the distribution system obtains the service life and equipment specifications of the first-class substation main transformer and the target substation main transformer by reading equipment files, nameplate information, etc., and determines whether the two are aging equipment based on the service life and whether the two are compatible to determine whether they meet the replacement conditions.

[0070] S205, both are compatible and are not aging devices.

[0071] Specifically, in a specific embodiment, if it is detected that the service life of both devices is no more than 20 years, and the difference between the two devices is no more than 5 years, then it is determined that both devices are not aging devices, otherwise, they are determined to be aging devices and cannot be replaced. In addition, if it is detected that the models and specifications of the main transformers of the two devices are basically matched, such as the capacity, voltage level, cooling method, etc., then it is determined that the two devices are compatible, otherwise, they are determined to be incompatible and cannot be replaced.

[0072] On this basis, if it is detected that the two are compatible and do not belong to aging equipment, step S206 is entered. Otherwise, if the first type of substation main transformer and all target substation main transformers do not meet the above conditions (the two are compatible and do not belong to aging equipment), step S209 is entered.

[0073] S206. Obtain location information of all target substation main transformers that meet the replacement conditions within the second preset range.

[0074] After screening in step S205, the power distribution system determines one or more light-load-heavy-load main transformer combinations that meet the exchange conditions. Before actually executing the exchange plan, the power distribution system obtains their location information (such as longitude and latitude coordinates). The location information can be obtained from the layout file of the main transformer installation or from the location coordinates uploaded by relevant technicians, which is not limited here.

[0075] In the above embodiment, the power distribution system determines whether the main transformers of two substations meet the replacement conditions based on service life and compatibility, thereby reducing the risk of failure caused by equipment aging or specification mismatch, and additional replacement costs.

[0076] S207. Calculate the replacement cost of the main transformer of the target substation at different locations based on the location information.

[0077] After determining the target substation main transformer that meets the replacement conditions, the distribution system obtains the location information of each candidate target substation main transformer and calculates the replacement cost at different locations.

[0078] The location information includes the specific geographical location of the substation main transformer, the distance from the first-class substation main transformer, the transportation route, etc. Based on these data, the distribution system can estimate the cost expenditure of each link such as disassembly, transportation, and installation of each target substation main transformer, thereby obtaining the complete replacement cost.

[0079] S208. Swap the position of the target substation main transformer whose replacement cost is lower than the capacity increase cost with the first type substation main transformer to obtain a light load replacement plan.

[0080] After calculating the replacement cost of the main transformer of the target substation at different locations, the distribution system compares it with the capacity increase cost to decide whether to replace or increase capacity.

[0081] Specifically, the distribution system first estimates the required main transformer capacity based on the historical load data of the main transformer and the local power demand plan (the specific process can be seen in step S203), and then calculates the overall capacity increase cost based on the cost level of the unit capacity. Then, the distribution system compares the replacement cost of each target substation main transformer with the capacity increase cost. If the replacement cost is lower, the target substation main transformer will be included in the light load replacement plan; conversely, if the capacity increase cost is lower, the replacement should be abandoned and the status quo should be maintained.

[0082] Among them, the capacity expansion cost refers to the expense of meeting the load demand by increasing the capacity of the main transformer, which mainly depends on the capacity demand of the main transformer of the first type of substation.

[0083] In the above embodiment, when the distribution system selects the target substation main transformer for replacement, it calculates the replacement costs at different locations and selects the target substation main transformer with the highest cost-effectiveness as the replacement target, which can reduce operating costs, achieve optimal allocation of resources, and improve the economic operation efficiency of the distribution system.

[0084] S209: Obtain a main transformer of a second type substation that meets the heavy load condition in the first preset area.

[0085] This step is the same as step S104 and will not be repeated here.

[0086] S210, obtaining the electricity demand plan of the local project to be built and the historical load average of the main transformer of the second-type substation within a preset time range.

[0087] The distribution system obtains the medium- and long-term development plans compiled by local official departments, especially the energy and power special plans involved. According to the capacity indicators of new, under-construction and planned projects mentioned in the plan, the new electricity demand in the region is determined. In addition, by obtaining the historical operation data of the main transformer of the second-class substation in the past 3-5 years, focusing on the statistical characteristics of its load curve in typical time periods (peak days, holidays, seasons, etc.), the load averages of different time scales are calculated accordingly.

[0088] S211. Determine the capacity increase of the main transformer of the second type substation based on the historical load average and the power demand plan, and obtain a heavy load capacity increase plan.

[0089] This step is the same as step S105 and will not be repeated here.

[0090] S212. Determine the main transformer of the third type of substation from the main transformers of the second type of substation according to the capacity increase of the main transformer.

[0091] The distribution system obtains the location information of each second-class heavy-load substation and calculates the main transformer capacity increase of each heavy-load substation main transformer in the capacity increase plan. By comparing the capacity increase of main transformers of different substations, the substation main transformers with the largest preset number of main transformer capacity increase are determined, and then the substation main transformers with the largest preset number are classified as third-class substation main transformers, so as to make further modifications to the heavy-load capacity increase plan.

[0092] In the above embodiment, the power distribution system obtains location information and analyzes the capacity increase ratio of the main transformer to determine the third-type substation main transformer that needs additional capacity increase, so as to share the power consumption pressure for other adjacent areas in an emergency.

[0093] S213. Determine the peak power consumption period and the low power consumption period of the main transformer of each second-category substation based on the historical load data.

[0094] After formulating the replacement and capacity expansion plan for the main transformer of the substation, the distribution system can also arrange the implementation time to reduce the impact on the normal power supply. Specifically, by analyzing the historical load data of the main transformer of the second type of heavy-load substation, the distribution system can determine the periodic law of its power load. For example, the peak power consumption period of each day usually occurs at 9:00-12:00 and 14:00-16:00, while 23:00-7:00 the next day is often the low power consumption period. During the week, the power load on weekdays from Monday to Friday is generally higher than that on weekends.

[0095] The power distribution system can more accurately predict the peak and off-peak periods of power consumption of the main transformers of each heavy-load substation by analyzing historical data.

[0096] S214. Implement a plan to improve the operating efficiency of the power distribution system during the low-peak electricity consumption period.

[0097] After reasonably determining the implementation time (i.e., the low-peak period of electricity consumption), the power distribution system generates a detailed implementation plan, including the specific date of the replacement and capacity increase of the main transformers of each substation, the required construction force, emergency plans, etc., to ensure that the transformation is completed efficiently within the specified time and the impact on power supply is minimized.

[0098] In the above embodiment, the power distribution system determines the peak and off-peak periods of power use based on historical load data, and implements the improvement plan during the low-load period. This reduces the impact on users, and at the same time, uses the off-peak period to optimize and adjust the system, which can more effectively utilize resources and reduce risks and costs during the implementation process.

[0099] For ease of understanding, the division of the first preset area and the second preset area in the embodiment of the present application is introduced below. Figure 3 As shown in FIG. 1 , it is a schematic diagram of an exemplary scenario in which the first preset area and the second preset area are divided in an embodiment of the present application. Among them, the first preset area is the area where the distribution system operation efficiency needs to be improved. The area is generally large and has multiple substation main transformers, such as Figure 3 As shown by black dots or white dots, black dots represent heavy-load substation main transformers (second-class substation main transformers), and white dots represent light-load substation main transformers (first-class substation main transformers). The second preset area is a circular area with a preset radius centered on any first-class substation main transformer that meets the light-load condition. Of course, it can also be other irregular shapes, which are not limited here. All heavy-load substation main transformers (such as Figure 3 The black dot in the middle is the main transformer of the target substation.

[0100] The power distribution system of the embodiment of the present invention is applied to electronic equipment. Figure 4 A schematic diagram of the architecture of an electronic device suitable for implementing an embodiment of the present invention is shown.

[0101] It should be noted that Figure 4 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0102] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by instructions (computer programs), or by controlling related hardware through instructions (computer programs), and the instructions can be stored in a computer-readable storage medium and loaded and executed by a processor. The electronic device of this embodiment includes a storage medium and a processor, wherein a plurality of instructions are stored in the storage medium, and the instructions can be loaded by the processor to execute any step of the method provided in the embodiment of the present invention.

[0103] Specifically, the storage medium and the processor are electrically connected directly or indirectly to realize data transmission or interaction. For example, these elements can be electrically connected to each other through one or more signal lines. The storage medium stores computer execution instructions for implementing the data access control method, including at least one software function module that can be stored in the storage medium in the form of software or firmware. The processor executes various functional applications and data processing by running the software program and module stored in the storage medium. The storage medium can be, but is not limited to, random access storage medium (Random Access Memory, referred to as: RAM), read-only storage medium (Read Only Memory, referred to as: ROM), programmable read-only storage medium (Programmable Read-Only Memory, referred to as: PROM), erasable read-only storage medium (Erasable Programmable Read-Only Memory, referred to as: EPROM), electrically erasable read-only storage medium (Electric Erasable Programmable Read-Only Memory, referred to as: EEPROM), etc. Among them, the storage medium is used to store programs, and the processor executes the program after receiving the execution instruction.

[0104] Furthermore, the software programs and modules in the above-mentioned storage medium may also include an operating system, which may include various software components and / or drivers for managing system tasks (such as memory management, storage device control, power management, etc.), and may communicate with various hardware or software components to provide an operating environment for other software components. The processor may be an integrated circuit chip having signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc., which may implement or execute the various methods, steps, and logic flow diagrams disclosed in this embodiment. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0105] Since the instructions stored in the storage medium can execute the steps in any method provided in the embodiments of the present invention, the beneficial effects of any method provided in the embodiments of the present invention can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0106] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for improving the operating efficiency of a power distribution system, applied to a power distribution system, characterized in that: The method comprises: Obtain a first-category substation main transformer that meets the light-load condition in a first preset area; Taking each of the first-type substation main transformers as the center, obtaining a target substation main transformer that meets the heavy load condition within a second preset area, where the second preset area is smaller than the first preset area; If there is a main transformer of the target substation that meets the replacement conditions with the main transformer of the first type of substation, the positions of the two are swapped to obtain a light load replacement plan; Obtain a second type substation main transformer that meets the heavy load condition in the first preset area; Determine the main transformer capacity increase of each second-category substation main transformer according to historical load data and local power demand planning to obtain a heavy-load capacity increase plan; A distribution system operation efficiency improvement plan is generated based on the light-load replacement plan and the heavy-load capacity expansion plan.

2. The method according to claim 1, characterized in that Before the step of swapping the positions of the target substation main transformer and the first type substation main transformer if they meet the swap condition to obtain a light load swap plan, the step further includes: Determining the main transformer capacity of the main transformer of the first type of substation; Obtaining historical load data of the main transformer of the target substation and local electricity demand planning; Determine the main transformer capacity requirement based on the historical load data and local power demand planning; Whether the main transformer capacity and the main transformer capacity requirement meet the replacement conditions is determined based on the main transformer capacity and the main transformer capacity requirement.

3. The method according to claim 2, characterized in that The step of determining whether the main transformer capacity and the main transformer capacity requirement meet the replacement condition includes: Obtaining the service life and equipment specifications of the main transformer of the first type substation and the main transformer of the target substation, wherein the service life is used to determine whether the two are aging equipment, and the equipment specifications are used to determine whether the two are compatible; If it is detected that the two are incompatible or one of them is an aged device, it is determined that the two do not meet the conditions for exchange; If it is detected that the two are compatible and neither of them is an aged device, then it is determined that the two meet the conditions for exchange.

4. The method according to claim 1, characterized in that The step of taking each of the first-type substation main transformers as the center and acquiring the target substation main transformer that meets the heavy load condition within the second preset range specifically includes: Constructing a digital model of the power grid topology of the first preset area according to the location of each main transformer of the substation in the first preset area and the corresponding transmission line; Based on the grid topology digital model, a minimum spanning tree algorithm is used to calculate an optimal transmission path between the first type substation main transformer and the target substation main transformer to obtain a transmission path set; Calculating the power flow distribution of each of the optimal power transmission paths according to the power transmission path set and the historical load data of the main transformer of the target substation to obtain power flow distribution data; Based on the power flow distribution data, calculating the stability index of the optimal power transmission path, the stability index including the voltage stability margin and power transmission margin corresponding to the main transformer of the target substation; The target substation main transformer is screened based on the stability index, and the target substation main transformer that meets the preset stability index is determined as the target substation main transformer that meets the replacement condition.

5. The method according to claim 1, characterized in that The step of swapping the positions of the target substation main transformer and the first type substation main transformer if they meet the swap condition to obtain a light load swap plan specifically includes: Obtaining location information of all target substation main transformers that meet the replacement conditions within the second preset range; Calculate the replacement cost of the main transformer of the target substation at different locations based on the location information; The target substation main transformer whose replacement cost is lower than the capacity increase cost is exchanged with the first type of substation main transformer to obtain a light load replacement plan, and the capacity increase cost is determined according to the capacity demand of the main transformer.

6. The method according to claim 1, characterized in that The step of determining the main transformer capacity increase of each second-type substation main transformer according to the historical load data and the local power demand plan to obtain the heavy load capacity increase plan specifically includes: Obtain historical load data of the main transformer of the second type substation within a preset time range to obtain the historical load average; Obtain relevant documents on local development planning and determine the electricity demand plan for local projects to be built; The main transformer capacity increase of the second type of substation main transformer is determined according to the historical load average and the electricity demand plan to obtain a heavy load capacity increase plan.

7. The method according to claim 1, characterized in that After the step of determining the capacity increase of each second-type substation main transformer according to the historical load data and the local power demand plan to obtain a heavy load capacity increase plan, the method further includes: Obtain equipment parameters and historical operation data of the first-type substation main transformer, the target substation main transformer, and the second-type substation main transformer; Based on the equipment parameters and historical operation data, calculating the equipment correlation index between the first type of substation main transformer and the target substation main transformer, and the load correlation index between the target substation main transformer and the second type of substation main transformer; Performing weighted calculation on the equipment correlation index and the load correlation index to obtain a comprehensive system correlation degree; According to the comprehensive correlation of the system, a butterfly effect propagation model is established, and the system impact is obtained by calculating the impact of load transfer and voltage distribution; Based on the system impact, the light-load replacement plan and the heavy-load capacity expansion plan are prioritized to generate an optimal implementation order.

8. A power distribution system, characterized in that: The power distribution system includes: one or more processors and memory; The memory is coupled to the one or more processors, and the memory is used to store computer program codes, wherein the computer program codes include computer instructions, and the one or more processors call the computer instructions to enable the power distribution system to perform the method according to any one of claims 1 to 7.

9. A computer-readable storage medium comprising instructions, characterized in that: When the instructions are executed on a power distribution system, the power distribution system is caused to execute the method according to any one of claims 1 to 7.

10. A computer program product, characterized in that When the computer program product is run on a power distribution system, the power distribution system is caused to perform the method according to any one of claims 1 to 7.

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