A resource efficiency analysis method for 10 kV bays in substations

Abstract

The present invention discloses a 10 kV interval resource efficiency analysis method for a substation, comprising the following steps: constructing four quadrants for interval resource efficiency analysis to obtain four quadrant boundaries; dynamically correcting the four quadrant boundaries by clustering analysis to predict the growth trend of load combined with N-1 verification; analyzing the characteristics of the substation in different quadrants based on the dynamically corrected four-quadrant boundaries to obtain the impact data of the substation in each quadrant; constructing a cross-quadrant collaborative optimization mechanism, and outputting the efficiency improvement strategy of the substation in different quadrants according to the impact data of the substation in each quadrant. The present invention solves the problem that the interval resource analysis method is relatively one-sided and does not propose an accurate substation efficiency improvement strategy by constructing four quadrants for resource efficiency analysis and proposing targeted efficiency improvement strategies for the substations in each quadrant.

Description

Technical Field

[0001] The present invention relates to the technical field of 10 kV interval resource efficiency analysis for substations, and in particular to a 10 kV interval resource efficiency analysis method for substations. Background Art

[0002] With the increasing saturation of urban construction, the land for substation facilities is becoming increasingly tight, which puts higher requirements on the utilization efficiency of substations in operation and those to be put into operation in the future. As a necessary carrier for releasing the power supply capacity of substations, whether the 10kV outgoing line interval is used properly directly affects the utilization efficiency of substations. At present, 110kV substations generally have the problem that the 10kV outgoing line interval has been basically used up, but the power supply capacity of the main transformer has not been effectively released, which affects the high-quality development of the power grid itself.

[0003] After summarizing the practice of power grid construction, operation and management in recent years, power grid companies have attached more and more importance to the 10 kV outgoing line interval resources of substations. At present, how to conduct a more comprehensive, systematic and accurate analysis of the efficiency of 10 kV outgoing line interval resources of substations, so as to standardize the use of 10 kV outgoing line intervals of substations, promote the improvement of substation utilization efficiency, and guide the reasonable layout of substations, is an issue that power grid companies urgently need to study and solve.

[0004] Substations are important facilities in power systems that convert voltage levels and ensure power quality. Its functions include boosting, reducing, distributing, and regulating current. Substations usually connect high-voltage transmission lines and low-voltage distribution systems. In power systems, equipment in substations is generally divided and managed according to different voltage levels. A 10 kV bay refers to a part of a substation that is primarily responsible for the distribution and management of power at a 10 kV voltage level. Usually, a substation is divided into different "bay" areas, with each bay responsible for power supply and power regulation at a certain voltage or area. 10 kV is a common voltage level in medium and low voltage power systems, and is usually used to supply power to larger areas such as residential areas and industrial parks.

[0005] Resource efficiency analysis refers to ensuring efficient use of resources by evaluating and optimizing the use of resources. In substations, energy efficiency analysis is mainly used to evaluate the relationship between the energy consumed and the transmitted electric energy during power transmission and conversion in the substation. Its purpose is to discover energy waste and improve the efficiency of power use.

[0006] For example, the invention patent with announcement number: CN110729707A discloses an intelligent substation interval protection control system, and the technical problem to be solved is to improve the speed and reliability of intelligent substation protection and improve the operation and maintenance efficiency. The present invention adopts the following technical scheme: an intelligent substation interval protection control system, which is provided with a management module, an application module, an input and output module and an analog-to-digital conversion module. Compared with the prior art, the present invention sets an intelligent substation interval protection control system in an interval, realizes the collection of AC voltage and AC current, circuit breaker and isolation switch opening and closing position information, analog-to-digital conversion, control and protection in this interval, improves the action speed of protection, improves the operation reliability of the intelligent substation, and greatly improves the operation and maintenance efficiency of the intelligent substation.

[0007] For example, the invention patent with announcement number: CN101789160B discloses an IoT-based intelligent video substation interval anti-mistaken entry system, which is mainly composed of a video surveillance camera, a video storage server, an audio-visual alarm device at the substation site and an intelligent video analysis server, a video storage server, and an audio-visual alarm device at the centralized control center. The various parts of the system are connected together through the power communication network. The system uses intelligent video technology to achieve the function of preventing mistaken entry of substation operators.

[0008] The above disclosed technical solutions have at least the following technical problems:

[0009] The existing substation resource efficiency analysis system has not established a systematic evaluation and analysis model. The interval resource analysis method is relatively one-sided and has not proposed an accurate substation efficiency improvement strategy. The interval resource analysis method is not in-depth enough and has not formed a standardized evaluation and analysis paradigm. The interval resource analysis method is difficult to promote.

[0010] In view of the above problems, the present invention proposes a solution. Summary of the invention

[0011] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a 10 kV interval resource efficiency analysis method for substations. By constructing four quadrants for resource efficiency analysis and proposing targeted efficiency improvement strategies for substations in each quadrant, it solves the problem that the interval resource analysis method is relatively one-sided and does not propose accurate substation efficiency improvement strategies.

[0012] To achieve the above object, the present invention provides the following technical solutions:

[0013] A method for analyzing the efficiency of 10 kV interval resources of a substation comprises the following steps: constructing four quadrants for interval resource efficiency analysis to obtain four-quadrant boundaries; dynamically correcting the four-quadrant boundaries by predicting the growth trend of load through cluster analysis combined with N-1 verification; analyzing the characteristics of the substation in different quadrants based on the dynamically corrected four-quadrant boundaries to obtain the impact data of the substation in each quadrant; constructing a cross-quadrant collaborative optimization mechanism to output the efficiency improvement strategy of the substation in different quadrants according to the impact data of the substation in each quadrant.

[0014] In a preferred embodiment, the construction of the four quadrants for interval resource efficiency analysis is as follows: analyzing the interval resource efficiency of the substation, identifying the characteristics of the load rate and the interval utilization rate; determining the dimensions of the four quadrants, dividing the interval resources of the substation into four quadrants, and obtaining the boundaries of the four quadrants; obtaining the substation operation data and historical data, and performing data processing on the operation data and historical data, and calculating the interval utilization rate and load rate of each substation; drawing a scatter plot with the interval utilization rate as the horizontal axis and the load rate as the vertical axis.

[0015] In a preferred embodiment, the specific steps of dynamically correcting the four-quadrant boundaries are as follows: obtaining historical data on the load rate and interval utilization rate of the substation, clustering the historical data with the substation load rate and interval utilization rate as the main features, and identifying different load modes; predicting the future load growth trend of each cluster through time series analysis combined with the clustering results; adjusting the substation load rate boundary and interval utilization rate boundary according to the load growth prediction results; and updating the four-quadrant division according to the new load rate boundary and interval utilization rate boundary.

[0016] In a preferred embodiment, the construction of a cross-quadrant collaborative optimization mechanism is specifically as follows: based on the four-quadrant division results, identify the substations in the first quadrant and the third quadrant; determine the physical connection path between the high-load station and the low-load station through power grid topology analysis; evaluate the load status of the physical connection path through dynamic topology technology, and determine the load transfer path based on the evaluation results; mark and activate feasible load transfer paths in the power grid dispatching system; transfer load according to the load curve of the high-load station and the capacity margin of the low-load station; after the load transfer is completed, re-evaluate the load rate changes of the high-load station and the low-load station; analyze the idle resources of each substation, establish a resource list, evaluate the priority of substation resource sharing, and dynamically dispatch according to the priority.

[0017] In a preferred embodiment, the efficiency improvement strategy for the first quadrant is specifically as follows: analyzing the load levels of substations surrounding the first quadrant substation, and transferring the 10 kV feeder load that exceeds the threshold load to surrounding substations with loads below the threshold by adjusting the operating mode and load shedding measures; adding new points in the surrounding areas of the first quadrant substation, and maintaining the substation load and interval utilization rate within a preset range through grid optimization and load shedding.

[0018] In a preferred embodiment, the efficiency improvement strategy of the second quadrant is specifically as follows: real-time monitoring of the load conditions of the outgoing line intervals, analysis of the load rate, load curve and peak load of each interval, identification of high-load intervals, archiving of the load data of each interval, and establishment of a historical load database; analysis of the load of the high-load intervals, identification of transferable loads, and establishment of diversion priorities; re-planning of the low-load intervals to ensure that they can bear the load after diversion and improve interval utilization.

[0019] In a preferred embodiment, the efficiency improvement strategy for the third quadrant is specifically as follows: optimizing the 10 kV grid of the third quadrant substation to evenly distribute the load; transferring part of the load of high-load substations around the third quadrant substation to the third quadrant substation to balance the load distribution in the area and increase the load level of the third quadrant substation; and adjusting the 10 kV feeder load to the third quadrant substation through load shearing.

[0020] In a preferred embodiment, the efficiency improvement strategy for the fourth quadrant is specifically as follows: merging the light-load line loads and cutting part of the load of the surrounding substations with loads above the threshold to the current substation; obtaining the load conditions and transfer requirements of the fourth quadrant substation, formulating a load transfer plan, and conducting safety and stability assessments, implementing load transfer, and monitoring and optimizing the substation after the transfer; tracking and promoting the recovery and adjustment of the 10 kV dedicated line interval, and reclaiming the dedicated line interval for users whose long-term maximum load rate of the dedicated line is less than the light load.

[0021] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] 1. By constructing a four-quadrant analysis method, combined with the load rate and interval utilization rate of the substation, the operating status of the substation is comprehensively analyzed from multiple dimensions. Different from the traditional single evaluation method, this comprehensive analysis can more comprehensively understand the use of substation resources and power supply reliability, and can more accurately identify potential problems.

[0023] 2. The four additional boundaries form a "reasonable range" that provides a clear ideal operating range for the substation, clarifying which states are the best for optimizing resources and power supply reliability. The introduction of reasonable ranges provides a clear reference standard for the operating efficiency and reliability of the substation, helping to ensure that substation resources are used reasonably.

[0024] 3. By analyzing whether the substation is located in a reasonable range, potential problems in resource utilization and load distribution of the substation can be discovered in time, early warning can be given and appropriate response measures can be taken, thus avoiding the late reaction lag that may exist in traditional technologies.

[0025] 4. Optimization measures for load balancing and interval use of substations in different time periods and quadrants help improve power supply stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart of a method for analyzing the resource efficiency of a 10 kV interval in a substation provided in an embodiment of the present application;

[0027] Figure 2 A four-quadrant schematic diagram of interval resource analysis provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the structure of a 10 kV interval resource efficiency analysis method system for a substation provided in an embodiment of the present application; DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0031] Embodiment 1, Figure 1 The present invention provides a method for analyzing the resource efficiency of a 10 kV interval in a substation, comprising the following steps:

[0032] Step S1, constructing four quadrants for interval resource efficiency analysis and obtaining four quadrant boundaries;

[0033] Obtain the substation load rate and interval utilization rate, use the interval utilization rate as the horizontal coordinate and the substation load rate as the vertical coordinate to construct the four quadrants of interval resource analysis. The construction method of the four quadrants is as follows:

[0034] Analyze the bay resource efficiency of the substation and identify the characteristics of load factor and bay utilization rate;

[0035] Determine the dimensions of the four quadrants, divide the bay resources of the substation into four quadrants, and obtain the boundaries of the four quadrants;

[0036] Obtain substation operation data and historical data, process the operation data and historical data, and calculate the interval utilization rate and load rate of each substation;

[0037] Draw a scatter plot with the interval utilization rate as the horizontal axis and the load rate as the vertical axis;

[0038] Analyze the characteristics of substations in each quadrant;

[0039] The growth trend of load is predicted through cluster analysis and combined with N-1 verification to dynamically correct the boundaries of the four quadrants;

[0040] If the substation equipment is seriously aged, the substation will be classified as a high-risk quadrant even if the load factor does not reach the threshold.

[0041] Step S2, dynamically correct the four-quadrant boundaries by predicting the growth trend of the load through cluster analysis combined with N-1 verification.

[0042] In this embodiment, the specific steps of dynamically correcting the four-quadrant boundaries are as follows:

[0043] Obtain historical data of load rate and interval utilization rate of the substation, cluster the historical data with the substation load rate and interval utilization rate as main features, and identify different load modes, wherein the load modes include steady growth, seasonal fluctuation, and rapid ramp-up;

[0044] By combining time series analysis with clustering results, the future load growth trend of each cluster is predicted;

[0045] Adjust the substation load rate boundary and interval utilization rate boundary according to the load growth forecast results;

[0046] The four-quadrant division is updated according to the new load rate boundary and interval utilization rate boundary.

[0047] The calculation formula for adjusting the substation load rate boundary is as follows:

[0048]

[0049] The calculation formula for adjusting the substation interval utilization rate boundary is as follows:

[0050]

[0051] Where: is the new load rate boundary after the load change, is the load rate boundary of the current system, is the predicted load factor increase, is a safety margin to cope with forecast errors or sudden loads. is the new load rate boundary after the load change, The current system load rate boundary, is the load growth adjustment factor, is the load fluctuation correction factor.

[0052] It should be noted that if future load growth causes the load rate to exceed the current boundary (50%), the N-1 verification will fail. Therefore, it is necessary to readjust the load rate boundary according to the load growth trend. The load growth adjustment coefficient is 1 for steady growth, 1.2 for rapid growth, and 0.8 for slow growth. The load fluctuation correction coefficient reflects seasonal fluctuations or sudden load changes. It is 1.1 when the fluctuation is large and 1 for steady growth.

[0053] It should be noted that this embodiment uses 70% interval utilization as the boundary between quadrants 1 and 4 and quadrants 2 and 3 for the following reasons:

[0054] Considering the balance between effective utilization and reservation of substation bay resources, when the bay utilization rate reaches 70%, it means that most bays have been used, but there is still a certain margin (30% of unused bays) to cope with possible future load growth or backup needs in emergencies. Such a setting helps ensure that the substation is neither overcrowded nor too idle, thereby optimizing the efficiency of resource utilization.

[0055] It should be noted that this embodiment uses 50% substation load rate as the boundary between quadrants 1 and 2 and quadrants 3 and 4 for the following reasons:

[0056] The 50% substation load rate is selected as the quadrant boundary based on the consideration of N-1 verification. In the power system, N-1 verification means that after any component (such as a transformer) fails and stops operating, the system can still operate normally and meet the power supply demand. Therefore, setting a 50% load rate as the boundary means that in the event of a single main transformer failure, the remaining main transformers still have sufficient capacity to bear the load of the entire substation, ensuring the reliability and stability of power supply.

[0057] The setting of these boundaries helps to divide the substation's operating status into four quadrants, each of which represents a different level of resource utilization efficiency and power supply reliability. By analyzing which quadrant a substation falls into, we can intuitively understand whether its resource utilization is sufficient and whether its power supply is reliable, so as to take corresponding measures to optimize it.

[0058] In order to further conform to the actual situation, four additional boundaries are added to enclose the reasonable distribution interval of substations. The reasonable interval refers to the area surrounded by the four additional boundaries (upper boundary, right boundary, left boundary and lower boundary) in the four-quadrant diagram. This area represents the ideal state of substation resource utilization efficiency and power supply reliability, among which:

[0059] Upper boundary: substation heavy load line (80% load factor);

[0060] Right border: interval utilization rate 100%;

[0061] Left boundary: Set the outgoing line intervals to be overloaded. When the interval utilization rate reaches a certain level, the substation will be overloaded. At this time, the coordinate origin (i.e., 0 outgoing line, 0 load rate) and the critical point (60% interval utilization rate, 80% load rate) are connected into a line as the left boundary. The rated load of the interval operation is about 8 MW. Considering the interval load rate of 80%, it is about 6.4 MW. Considering the line simultaneous rate of 0.9, a total of about 14 intervals will cause the substation to be overloaded. At this time, the substation load converted to the substation level reaches about 80 MW, that is, the interval utilization rate is about 60%, which will cause the substation to be overloaded;

[0062] Lower boundary: assume that all outgoing lines of the substation interval are lightly loaded. At this time, the coordinate origin (i.e., 0 outgoing line, 0 load rate) and the critical point (100% interval utilization rate, 35% load rate) are connected into a line as the lower boundary. The rated load of the interval operation is about 8 MW, and the interval load rate of 20% is about 1.6 MW. When the interval utilization rate is 100%, considering the line simultaneous rate of 0.9, the substation load reaches about 35 MW when converted to the substation level, that is, when the interval utilization rate is 100%, the substation load rate reaches about 35%.

[0063] The formation of the left boundary critical point is based on the situation that when the utilization rate of the substation interval reaches a certain level, the substation is overloaded. This overload means that the substation is overloaded due to the increase in the number of outgoing lines in multiple intervals, thus exceeding the carrying capacity of the substation. The method for obtaining the critical point of the left boundary is as follows:

[0064] When the interval utilization rate of each interval increases, a load variation line graph of the substation is obtained;

[0065] Find the number of outgoing lines in the load variation line graph of the substation when the load of the substation begins to exceed the maximum carrying capacity of the substation;

[0066] The interval load rate and interval utilization rate corresponding to the number of interval outgoing lines are calculated to obtain the critical point of the left boundary.

[0067] The formation of the lower boundary critical point is based on the relationship between the substation load and the bay utilization rate when the substation outgoing lines are all in a light-load state. At this time, the substation load is relatively low, and the bay utilization rate fully meets the light-load operation requirements of the substation. The method for obtaining the lower boundary critical point is as follows:

[0068] When the bay is lightly loaded, a line graph is constructed showing the load of the substation changing with the bay utilization rate;

[0069] In the above line graph, the load rate corresponding to each interval when it is lightly loaded is calculated, and the load rate when the interval utilization rate reaches 100% is the critical point of the lower boundary.

[0070] It should be noted that in the line graph of the above-mentioned substation load changing with the interval utilization rate, focus is placed on the changing trend of the overall substation load when the interval outgoing line load is lighter; heavy load and light load are numerical standards generally considered in the electrical industry, with heavy load being 80% and light load being 30%.

[0071] Setting a reasonable range is important for the following reasons:

[0072] Optimize resource utilization: The interval utilization rate and load rate of substations falling within the reasonable range are both in a relatively ideal state, which means that the substation is neither overcrowded nor too idle, and resources are effectively utilized;

[0073] Improve power supply reliability: Substations within a reasonable range can still maintain high power supply reliability in the event of a single main transformer failure. This is because their load rate is moderate, and even if one main transformer is out of operation, the remaining main transformers can still meet the power supply demand;

[0074] Preventing potential risks: By analyzing whether the substation is within the reasonable range, potential operating risks can be discovered in time. This includes the following: If the substation is in the first quadrant but not within the reasonable range, it may mean that it is overused and there are certain operating risks. At this time, appropriate measures can be taken for early warning and intervention to avoid accidents.

[0075] Step S3, based on the dynamically corrected four-quadrant boundaries, analyzing the characteristics of the substation in different quadrants to obtain the impact data of the substation in each quadrant;

[0076] Calculate the substation load rate and interval utilization rate of the substation to be evaluated to form a set of coordinates (x, y). According to the "four-quadrant" analysis method, the substation coordinates can be divided into four quadrants (including reasonable intervals).

[0077] The calculation method of substation load factor is as follows:

[0078]

[0079] Where: is the calculation formula of substation load factor, Refers to the total load currently carried by all main transformers in the substation. Refers to the maximum load-bearing capacity of the main transformer during design, that is, the rated capacity of the main transformer.

[0080] Furthermore, by analyzing the timing characteristics of photovoltaic output (such as diurnal changes and seasonal fluctuations), the total load and main transformer rated capacity in the load factor calculation model are corrected.

[0081] The interval utilization is calculated as follows:

[0082]

[0083] Where: is the calculation formula of interval utilization rate, is the number of 10 kV bays in use in the substation, Refers to the total number of 10 kV bays designed in the substation.

[0084] The first quadrant is an area with both high interval utilization rate and main transformer load rate, indicating that the substation interval is fully utilized, the main transformer power supply capacity is also fully released, and the substation 10kV interval efficiency is high. If the substation falls in the first quadrant and is in a reasonable range (shaded area), it is an ideal state; if it falls in the first quadrant but is not in a reasonable range (shaded area), the substation is overused and there are certain operational risks, which should be resolved by measures;

[0085] The second quadrant is an area with low interval utilization but high main transformer load rate, indicating that the substation interval is relatively underutilized, but the main transformer power supply capacity is fully released. The main reason for this phenomenon is that the average load of the used 10 kV interval is large, and the main transformer load has reached a high level before the 10 kV interval is fully utilized, which is an unequal distribution of the main transformer power supply capacity in the 10 kV interval. If the substation falls within the reasonable interval (shaded area), the overall operation is still relatively reasonable; if it falls outside the reasonable interval (shaded area), it is recommended to appropriately divert the load of the outgoing interval;

[0086] The third quadrant is an area with "double low" interval utilization rate and main transformer load rate, indicating that the substation interval is not fully utilized and the main transformer power supply capacity is not fully released. The reason for this phenomenon is generally that the substation has been in operation for a short time and the power supply capacity is in the process of gradual release; it may also be that the load development in the substation supply area is not as expected, resulting in the delay in the release of the substation power supply capacity. If the substation falls within a reasonable interval (shaded area), you only need to wait for the load to climb; if it falls outside the reasonable interval (shaded area), it is recommended to strengthen the control of the remaining intervals to prevent the substation from entering the fourth or second quadrant;

[0087] The fourth quadrant is an area with high bay utilization and low main transformer load rate, indicating that the substation bay is fully utilized, but the main transformer power supply capacity is not fully released, and the substation 10kV bay efficiency is low. The main reason for this phenomenon is that the average load of the used 10kV bay is small, and the 10kV bay has been fully used before the main transformer load has reached a reasonable level, which seriously affects the subsequent load access and substation operation efficiency.

[0088] Step S4, constructing a cross-quadrant collaborative optimization mechanism, and outputting efficiency improvement strategies for substations in different quadrants according to the impact data of substations in each quadrant.

[0089] In this embodiment, a cross-quadrant collaborative optimization mechanism is constructed, as follows:

[0090] Based on the four-quadrant division results, identify the substations in the first quadrant (high load rate, high interval utilization rate) and the third quadrant (low load rate, low interval utilization rate);

[0091] Through grid topology analysis, the physical connection paths between high-load stations and low-load stations are determined. The load status of each potential transfer path is evaluated through dynamic topology technology. Based on the evaluation results, feasible load transfer paths are determined to ensure that load transfer does not cause new problems.

[0092] Mark and activate feasible load transfer channels in the power grid dispatch system to ensure they can be quickly put into use when needed;

[0093] According to the load curve of the high-load station and the capacity margin of the low-load station, formulate a load transfer plan, specify the transfer time, transfer load amount and target substation;

[0094] Execute load transfer operations through the dispatching system or automation tools. After the load transfer is completed, re-evaluate the load rate changes of high-load stations and low-load stations to ensure that the transfer effect achieves the expected goal;

[0095] Analyze the idle resources of each substation, establish a resource list, evaluate the priority of resource sharing, and dynamically schedule according to the priority.

[0096] The specific steps of performing load status evaluation on the physical connection path are as follows:

[0097] A load status evaluation model is constructed through the SDN-based load balancing algorithm based on path transmission capacity margin, load rate deviation and path length;

[0098] The physical connection paths are sorted in descending order according to the evaluation results, and the paths with high scores are preferentially selected for load transfer;

[0099] Perform N-1 safety checks on the selected path. If the check fails, it will automatically switch to the suboptimal path.

[0100] The path transmission capacity margin formula is as follows:

[0101]

[0102] The load state evaluation formula is as follows:

[0103]

[0104] Where: is the load state, is the path transmission capacity margin, is the load factor deviation, is the path length, , and is the weight coefficient and , is the total transmission capacity of path i, is the current load of path i.

[0105] The resource sharing priority evaluation model is as follows:

[0106]

[0107] Where: is the actual amount of resources allocated to substation i, is the maximum amount of resources that substation i can dispatch, is the idle resource of substation i.

[0108] Further, the advantages of the cross-quadrant collaborative optimization mechanism are explained:

[0109] Through load transfer, the load of each substation in the power grid is effectively balanced to reduce overload and underload phenomena;

[0110] The structure and security of the power grid are considered during load transfer to ensure that load transfer does not have a negative impact on the power grid. The security of the path is evaluated through dynamic topology technology to avoid potential security risks.

[0111] Analyze and share idle resources of substations, improve resource utilization efficiency, and dynamically schedule according to resource sharing priorities to ensure reasonable allocation and use of resources;

[0112] Through cross-quadrant collaborative optimization, the intelligent operation and management of the power grid can be realized, manual intervention and decision-making time can be reduced, and the operation efficiency and response speed of the power grid can be improved.

[0113] For substations that fall within the reasonable range, there is generally no need to carry out special performance improvement; for substations that fall outside the reasonable range, it is necessary to carry out special performance improvement according to their specific quadrants. The specific strategies are as follows:

[0114] For the first quadrant substation, firstly, we focus on analyzing the load levels of surrounding substations, and transfer the 10 kV feeder load that exceeds the threshold load to surrounding substations with load below the threshold by adjusting the operating mode and load shedding measures; secondly, we add new points in the surrounding areas of the first quadrant substation, and through grid optimization and load shedding, keep the substation load and interval utilization rate within the preset range.

[0115] For the second quadrant substation, real-time monitoring of the load conditions of the outgoing line intervals is carried out, the load rate, load curve and peak load of each interval are analyzed, the high-load intervals are identified, the load data of each interval are archived, and a historical load database is established; the load of the high-load intervals is analyzed, the load that can be transferred (such as non-critical loads, adjustable loads, etc.) is identified, and diversion priorities are set; the low-load intervals are re-planned to ensure that they can bear the diverted load and improve the interval utilization rate.

[0116] For the third quadrant substation, we focus on analyzing the substation commissioning time, the load type of the supply area, the land development plan, and the load transfer needs of the surrounding substations, and formulate interval efficiency improvement measures according to local conditions. First, optimize the 10kV grid of the third quadrant substation to make the load evenly distributed; second, transfer part of the load of the high-load substations around the third quadrant substation to the third quadrant substation, balance the load distribution in the area, and improve the load level of the third quadrant substation; third, adjust the 10kV feeder load to the third quadrant substation through load shearing and modification.

[0117] For the fourth quadrant substation, the first step is to merge the light-load line loads and cut part of the load of the surrounding substations with loads above the threshold to the current substation; the second step is to obtain the load situation and transfer needs of the fourth quadrant substation, formulate a load transfer plan, conduct safety and stability assessments, implement load transfer, and monitor and optimize the substation after the transfer; the third step is to track and promote the recovery and adjustment of the 10 kV dedicated line interval, and reclaim the dedicated line interval for users whose long-term maximum load rate of the dedicated line is less than the light load.

[0118] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0119] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product.

[0120] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0121] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0122] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0123] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for analyzing the resource efficiency of a 10 kV interval in a substation, characterized in that: The steps include: Construct four quadrants for interval resource efficiency analysis and obtain the boundaries of the four quadrants; Predict the growth trend of load through cluster analysis and dynamically modify the boundaries of the four quadrants; Based on the dynamically corrected four-quadrant boundaries, the characteristics of substations in different quadrants are analyzed to obtain the impact data of substations in each quadrant; Build a cross-quadrant collaborative optimization mechanism to output efficiency improvement strategies for substations in different quadrants based on the impact data of substations in each quadrant; The four quadrants for interval resource efficiency analysis are constructed as follows: Analyze the efficiency of the interval resources of the substation, identify the characteristics of the load rate and the interval utilization rate, divide the interval resources of the substation into four quadrants with the interval utilization rate as the horizontal axis and the load rate as the vertical axis, and obtain the four-quadrant boundaries; The cross-quadrant collaborative optimization mechanism is constructed as follows: Based on the four-quadrant division results, identify the substations in the first and third quadrants; Determine the physical connection path between high-load stations and low-load stations through grid topology analysis; Use dynamic topology technology to evaluate the load status of physical connection paths and determine the load transfer path based on the evaluation results; Mark and activate feasible load transfer paths in the grid dispatch system; Load transfer is performed through load transfer paths according to the load curve of the high-load station and the capacity margin of the low-load station; After the load transfer is completed, re-evaluate the load rate changes of the high-load station and the low-load station.

2. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 1 is characterized in that: The specific steps of dynamically correcting the four-quadrant boundaries are as follows: Obtain the historical data of the load rate and interval utilization rate of the substation, cluster the historical data based on the characteristics of the substation load rate and interval utilization rate, and identify different load modes; By combining time series analysis with clustering results, the future load growth trend of each cluster is predicted; Adjust the substation load rate boundary and interval utilization rate boundary according to the load growth forecast results; The four-quadrant division is updated according to the new load rate boundary and interval utilization rate boundary.

3. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 2 is characterized in that: The specific steps of performing load status evaluation on the physical connection path are as follows: A load status evaluation model is constructed through the SDN-based load balancing algorithm based on path transmission capacity margin, load rate deviation and path length; The physical connection paths are sorted in descending order according to the evaluation results, and the paths with high scores are preferentially selected for load transfer; Perform N-1 safety checks on the selected path. If the check fails, it will automatically switch to the suboptimal path.

4. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 3 is characterized in that: The performance improvement strategies of the different quadrants include the first quadrant, and the performance improvement strategies of the first quadrant are as follows: Analyze the load levels of the surrounding substations in the first quadrant, and transfer the 10 kV feeder load that exceeds the threshold load to the surrounding substations with loads below the threshold by adjusting the operation mode and load shedding measures; New points are added in the surrounding areas of the first quadrant substation, and the substation load and interval utilization rate are maintained within the preset range through grid optimization and load shedding.

5. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 4 is characterized in that: The performance improvement strategies of different quadrants include the second quadrant, and the performance improvement strategies of the second quadrant are as follows: Monitor the load of the outgoing line intervals in real time, analyze the load rate, load curve and peak load of each interval, identify high-load intervals, archive the load data of each interval, and establish a historical load database; Analyze the load in high-load intervals, identify loads that can be transferred, and set diversion priorities; Reschedule low-load intervals.

6. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 5 is characterized in that: The performance improvement strategies of the different quadrants include the third quadrant, and the performance improvement strategies of the third quadrant are as follows: Optimize the 10 kV grid of the third quadrant substation to ensure balanced load distribution; Transfer part of the load of high-load substations around the third quadrant substation to the third quadrant substation to balance the load distribution in the area and increase the load level of the third quadrant substation; Through load shearing and modification, the 10 kV feeder load is adjusted to the third quadrant substation.

7. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 6 is characterized in that: The performance improvement strategies of the different quadrants include the fourth quadrant, and the performance improvement strategies of the fourth quadrant are as follows: Merge the lightly loaded lines and cut part of the load from the surrounding substations with loads above the threshold to the current substation; Obtain the load conditions and transfer requirements of the fourth quadrant substation, formulate a load transfer plan, conduct safety and stability assessments, implement load transfer, and monitor and optimize the substation after transfer; Track and promote the recovery and adjustment of 10 kV dedicated line intervals, and reclaim the dedicated line intervals for users whose long-term maximum load rate of dedicated lines is less than light load.

8. The method for analyzing the resource efficiency of a 10 kV interval in a substation according to claim 7 is characterized in that: The calculation formula for adjusting the substation load rate boundary is as follows: The calculation formula for adjusting the substation interval utilization rate boundary is as follows: The load status evaluation formula is as follows: Where: is the new load rate boundary after the load change, is the load rate boundary of the current system, is the predicted load factor increase, is a safety margin to cope with forecast errors or sudden loads. is the new load rate boundary after the load change, The current system load rate boundary, is the load growth adjustment factor, is the load fluctuation correction factor, is the load state, is the path transmission capacity margin, is the load factor deviation, is the path length, , and is the weight coefficient and .

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