Substation interval resource optimization system and method

Abstract

The invention discloses a transformer substation interval resource optimization system and method. The system comprises a creation module used for dividing a transformer substation into four quadrants through a four-quadrant analysis method; the analysis module is used for analyzing reasons of the transformer substations with problems in interval resource utilization; and the optimization module is used for forming corresponding resource optimization strategies for the four-quadrant transformer substation under different conditions from two aspects of technology and management, and realizing overall planning and scientific decision-making of interval resource use. According to the method, transformer substation interval resources are analyzed through a four-quadrant analysis method, a transformer substation interval resource utilization model is established, a transformer substation with an interval utilization problem is obtained, reason analysis is carried out on the transformer substation with the interval utilization problem, and finally an optimization thought and an optimization method are put forward. The problem that a traditional power distribution network planning method is incomplete in utilization of the transformer substation intervals is solved, the utilization efficiency and management of the power grid intervals are improved, and then the operation efficiency of a power system is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network planning, and in particular to a substation interval resource optimization system and method. Background Art

[0002] The distribution network is an important part of the power system. It is directly facing power users and is an important infrastructure for improving people's livelihood and ensuring economic and social development. It not only undertakes power supply services for power users, but also is related to the economic benefits of enterprises. Substation interval refers to the relevant equipment connected to a corresponding outgoing line in the station, generally including disconnectors, circuit breakers, current transformers, voltage transformers, lightning arresters, and other unit groups that constitute outgoing lines and busbars. The substation interval is the channel for load access to the substation, and its capacity and quantity determine the load access capacity. With the development of urban scale and the access of user loads, substation interval resources are becoming increasingly tense. How to reasonably allocate substation interval resources according to potential user needs has become an important issue for optimizing the utilization of urban electric energy resources and improving the efficiency of power grid operation, because improving the efficiency and management of power grid intervals can effectively improve the operating efficiency of the power system.

[0003] In traditional distribution network planning reports and power grid diagnosis and analysis reports, the description of interval utilization is often briefly mentioned, and there is a lack of scientific and systematic analysis methods. This incomplete description and lack of in-depth analysis methods make it impossible to fully evaluate and optimize the interval utilization efficiency of the power grid. In fact, the rationality of interval utilization is a crucial part of power grid planning and operation. By fully understanding and analyzing the interval utilization of the power grid, it is possible to determine whether there is a waste of resources or bottleneck problems, and it can also guide the improvement and optimization measures of the power grid.

[0004] There is currently no effective solution to the above problems. Summary of the invention

[0005] In view of the above technical problems in the related art, the present invention proposes a substation interval resource optimization system and method, which can overcome the above deficiencies in the prior art.

[0006] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: A substation bay resource optimization system, comprising: Creation module: used to divide the substation into four quadrants by four-quadrant analysis method; Specifically: construct four quadrants with the interval utilization rate as the horizontal axis and the substation load rate as the vertical axis; improve the four quadrants, consider the appropriate power supply capacity of the substation and the substation passing the "N-1" verification, select the interval occupancy rate of 70% and the load rate of 50% to construct the four-quadrant boundaries, and add a reasonable distribution interval of substations; Analysis module: used to analyze the substation causes of problems in bay resource utilization; Optimization module: It is used to form corresponding resource optimization strategies for four-quadrant substations in different situations from both technical and management levels, and realize overall planning and scientific decision-making on the use of interval resources.

[0007] Furthermore, the first quadrant is characterized by a high interval utilization rate and a load rate greater than 80%, indicating that this type of substation has hidden dangers in safe operation; the second quadrant is characterized by a high load rate but a low interval utilization rate, indicating that this type of substation has high operating efficiency but interval resources have not been fully released; the third quadrant is characterized by a low interval utilization rate and a low load rate, indicating that this type of substation needs to be checked to see if it is a newly built substation; the fourth quadrant is characterized by a high interval utilization rate but a low load rate, indicating that this type of substation has low operating efficiency and needs to focus on analyzing the causes and formulating solutions.

[0008] Furthermore, the upper boundary of the four-quadrant boundary is 80% load rate of the substation heavy-load line, and the right boundary is 100% interval occupancy rate.

[0009] Furthermore, the left boundary of the four-quadrant boundary is set to 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 and the critical point are connected to form a line as the left boundary; the origin is 0 outgoing line and 0 load rate; the critical point is 60% interval utilization rate and 80% load rate.

[0010] Furthermore, the lower boundary of the four-quadrant boundary is to set the substation interval outgoing lines to be lightly loaded. At this time, the coordinate origin and the critical point are connected to form a line as the lower boundary; the origin is 0 outgoing lines and 0 load rate; the critical point is 100% interval utilization rate and 35% load rate.

[0011] A method for optimizing substation interval resources comprises the following steps: S1 divides the substation into four quadrants through the four-quadrant analysis method; constructs four quadrants with the interval utilization rate as the horizontal axis and the substation load rate as the vertical axis; improves the four quadrants, considers the appropriate power supply capacity of the substation and the substation passes the "N-1" verification, selects the interval occupancy rate of 70% and the load rate of 50% to construct the four-quadrant boundaries, and adds a reasonable distribution interval of substations; S2 Analyze the substation causes of problems in bay resource utilization; S3 forms corresponding resource optimization strategies for four-quadrant substations in different situations from both technical and management perspectives, and realizes overall planning and scientific decision-making on the use of interval resources.

[0012] Furthermore, the first quadrant is characterized by a high interval utilization rate and a load rate greater than 80%, indicating that this type of substation has hidden dangers in safe operation; the second quadrant is characterized by a high load rate but a low interval utilization rate, indicating that this type of substation has high operating efficiency but interval resources have not been fully released; the third quadrant is characterized by a low interval utilization rate and a low load rate, indicating that this type of substation needs to be checked to see if it is a newly built substation; the fourth quadrant is characterized by a high interval utilization rate but a low load rate, indicating that this type of substation has low operating efficiency and needs to focus on analyzing the causes and formulating solutions.

[0013] Furthermore, the upper boundary of the four-quadrant boundary is 80% load rate of the substation heavy-load line, and the right boundary is 100% interval occupancy rate.

[0014] Furthermore, the left boundary of the four-quadrant boundary is set to 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 and the critical point are connected to form a line as the left boundary; the origin is 0 outgoing line and 0 load rate; the critical point is 60% interval utilization rate and 80% load rate.

[0015] Furthermore, the lower boundary of the four-quadrant boundary is to set the substation interval outgoing lines to be lightly loaded. At this time, the coordinate origin and the critical point are connected to form a line as the lower boundary; the origin is 0 outgoing lines and 0 load rate; the critical point is 100% interval utilization rate and 35% load rate.

[0016] Beneficial effects of the present invention: The present invention analyzes substation interval resources through the four-quadrant analysis method, establishes a substation interval resource utilization model, obtains substations with interval utilization problems, then conducts cause analysis on the substations with interval resource utilization problems, and finally proposes optimization ideas and methods, which solves the problem of imperfect substation interval utilization in traditional distribution network planning methods, improves the utilization efficiency and management of power grid intervals, and thus effectively improves the operation efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of the substation interval resource optimization method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying 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 belong to the scope of protection of the present invention.

[0020] like Figure 1 As shown, a substation interval resource optimization system according to an embodiment of the present invention includes: Creation module: used to divide the substation into four quadrants by four-quadrant analysis method; Specifically: construct four quadrants with the interval utilization rate as the horizontal axis and the substation load rate as the vertical axis; improve the four quadrants, consider the appropriate power supply capacity of the substation and the substation passing the "N-1" verification, select the interval occupancy rate of 70% and the load rate of 50% to construct the four-quadrant boundaries, and add a reasonable distribution interval of substations; Analysis module: used to analyze the substation causes of problems in bay resource utilization; Optimization module: It is used to form corresponding resource optimization strategies for four-quadrant substations in different situations from both technical and management levels, and realize overall planning and scientific decision-making on the use of interval resources.

[0021] The first quadrant is characterized by a high interval utilization rate and a load rate greater than 80%, indicating that this type of substation has hidden dangers in safe operation; the second quadrant is characterized by a high load rate but a low interval utilization rate, indicating that this type of substation has a high operating efficiency but the interval resources have not been fully released; the third quadrant is characterized by a low interval utilization rate and a low load rate, indicating that this type of substation needs to be checked to see if it is a newly built substation; the fourth quadrant is characterized by a high interval utilization rate but a low load rate, indicating that this type of substation has a low operating efficiency and needs to focus on analyzing the reasons and formulating solutions.

[0022] The upper boundary of the four-quadrant boundary is 80% load rate of the substation heavy load line, and the right boundary is 100% interval occupancy rate.

[0023] The left boundary of the four-quadrant boundary is that all the outgoing line intervals are set to be overloaded. When the interval utilization rate reaches a certain level, the substation will be overloaded. At this time, the coordinate origin and the critical point are connected to form a line as the left boundary; the origin is 0 outgoing line and 0 load rate; the critical point is 60% interval utilization rate and 80% load rate.

[0024] The lower boundary of the four-quadrant boundary is to assume that all the outgoing lines of the substation interval are lightly loaded. At this time, the coordinate origin and the critical point are connected to form a line as the lower boundary; the origin is 0 outgoing lines and 0 load rate; the critical point is 100% interval utilization rate and 35% load rate.

[0025] A method for optimizing substation interval resources comprises the following steps: S1 divides the substation into four quadrants through the four-quadrant analysis method; constructs four quadrants with the interval utilization rate as the horizontal axis and the substation load rate as the vertical axis; improves the four quadrants, considers the appropriate power supply capacity of the substation and the substation passes the "N-1" verification, selects the interval occupancy rate of 70% and the load rate of 50% to construct the four-quadrant boundaries, and adds a reasonable distribution interval of substations; S2 Analyze the substation causes of problems in bay resource utilization; S3 forms corresponding resource optimization strategies for four-quadrant substations in different situations from both technical and management perspectives, and realizes overall planning and scientific decision-making on the use of interval resources.

[0026] The first quadrant is characterized by a high interval utilization rate and a load rate greater than 80%, indicating that this type of substation has hidden dangers in safe operation; the second quadrant is characterized by a high load rate but a low interval utilization rate, indicating that this type of substation has a high operating efficiency but the interval resources have not been fully released; the third quadrant is characterized by a low interval utilization rate and a low load rate, indicating that this type of substation needs to be checked to see if it is a newly built substation; the fourth quadrant is characterized by a high interval utilization rate but a low load rate, indicating that this type of substation has a low operating efficiency and needs to focus on analyzing the reasons and formulating solutions.

[0027] The upper boundary of the four-quadrant boundary is 80% load rate of the substation heavy load line, and the right boundary is 100% interval occupancy rate.

[0028] The left boundary of the four-quadrant boundary is that all the outgoing line intervals are set to be overloaded. When the interval utilization rate reaches a certain level, the substation will be overloaded. At this time, the coordinate origin and the critical point are connected to form a line as the left boundary; the origin is 0 outgoing line and 0 load rate; the critical point is 60% interval utilization rate and 80% load rate.

[0029] The lower boundary of the four-quadrant boundary is to assume that all the outgoing lines of the substation interval are lightly loaded. At this time, the coordinate origin and the critical point are connected to form a line as the lower boundary; the origin is 0 outgoing lines and 0 load rate; the critical point is 100% interval utilization rate and 35% load rate.

[0030] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0031] In specific use, a substation interval resource optimization system and method according to the present invention solves the problem of imperfect substation interval utilization in traditional distribution network planning methods, so as to achieve the purpose of guiding the improvement of substation utilization efficiency.

[0032] Step 1: Propose a substation bay resource assessment method based on the four-quadrant analysis method. By constructing two dimensions, the substation load rate and bay utilization rate, the four quadrants are constructed with the bay utilization rate as the horizontal axis and the substation load rate as the vertical axis. The substation is divided into four quadrants using the four-quadrant analysis method: the first quadrant is a high bay utilization rate and the load rate is greater than 80%, which poses a safety operation hazard; the second quadrant is a high load rate but a low bay utilization rate. This type of substation has a high operating efficiency but the bay resources are not fully released; the third quadrant is a low bay utilization rate and a low load rate. This type needs to be checked to see if it is a newly built substation; the fourth quadrant is a high bay utilization rate but a low load rate. This type of substation has a low operating efficiency and needs to focus on analyzing the reasons and formulating solutions.

[0033] Considering that the substation has a certain power supply capacity, the interval occupancy rate of 70% is selected as the boundary. Considering that the substation has passed the "N-1" verification, the load rate of 50% is selected as the boundary to construct the four-quadrant boundary. In order to make up for the shortcomings of the four-quadrant analysis method, this analysis adds a reasonable substation distribution interval, which is surrounded by 4 boundaries. Among them: Upper boundary: substation heavy load line (80% load factor); Right border: interval occupancy 100%; 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 8MW, and the interval load rate of 80% is about 6.4MW. 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 80MW, that is, the interval utilization rate is about 60%, which will cause the substation to be overloaded.

[0034] Lower boundary: The substation interval outgoing lines are all lightly loaded. At this time, the coordinate origin (i.e., 0 outgoing lines, 0 load rate) and the critical point (100% interval utilization rate, 35% load rate) are connected into a line as the lower boundary. The interval operation rated load is about 8MW, and considering the interval load rate of 20%, it is about 1.6MW. When the interval utilization rate is 100%, considering the line simultaneous rate of 0.9, converted to the substation level, the substation load reaches about 35MW, that is, when the interval utilization rate is 100%, the substation load rate reaches about 35%.

[0035] Step 2: Analyze the reasons for the substations with problems in interval resource utilization. The substations distributed in the first quadrant are mainly high-load rate and high interval utilization rate. This type of substation is mainly distributed in the core area of ​​the city, where the load density is relatively high. The distribution network is relatively complete, and the interval utilization rate is relatively high. The load rate has reached more than 80%, which poses a safety hazard to operation. The substations distributed in the second quadrant are mainly high-load rate and low interval utilization rate. This type of substation is mainly located in industrial areas. There are fewer substation outgoing lines, but the substation load rate is relatively high. The substations distributed in the third quadrant are mainly low-load rate and low interval utilization rate. This type of substation is usually because the substation has been put into operation for a short time and the supporting projects have not been fully completed; or the load in the area is relatively dispersed, resulting in low load rate and interval utilization rate. The substations located in the fourth quadrant have high interval utilization, low load rate, and the lowest interval utilization efficiency. After a focused investigation and analysis of the substations in this quadrant, the main reasons are found to be as follows: The first is the supply area factor. The substation supplies electricity to the township area, where the load is small and dispersed, resulting in more outgoing lines between substations, but a lower load rate.

[0036] Second, the main supply is for residential use with a large load. The residential power supply lines are funded by the government, but one line only supplies a few communities, and the power load is small, resulting in a waste of resources. This phenomenon is more prominent in urban areas.

[0037] Third, after the substation was put into operation, although the supporting projects had been implemented, the relevant loads had not yet been transferred.

[0038] Fourth, there are other reasons, including planned retirement, voltage upgrading and transformation, reduced factory capacity, and industrial adjustment.

[0039] Step 3: Propose optimization ideas and formulate optimization strategies. In view of the increasingly scarce distribution network interval resources, the management of interval resource use should be strengthened. How to use limited interval resources to meet the growing demand for power access requires joint efforts from both technical and management levels, and form corresponding resource optimization strategies for four-quadrant substations in different situations to achieve overall planning and scientific decision-making on the use of interval resources.

[0040] Technical level. The load rate and interval utilization rate of the first quadrant substation are relatively high, which means that the utilization of the interval resources of the substation is relatively tight. It is necessary to consider taking appropriate measures to reduce the load of the substation. The main strategies are as follows: 1) Adjust the substation supply area. Under the premise of not implementing the grid-type new construction / renovation plan, optimize the substation supply area by adjusting the position of the interconnection switch. 2) Improve inter-station communication. When the original opposite-side interconnection substation cannot transfer load, increase the load transfer margin by adding a new distribution network load transfer channel. 3) Build a new substation. When the distribution network means are ineffective, consider using the main network means such as the new substation to transfer heavy loads. The load rate of the second quadrant substation is high and the interval utilization rate is low. The substation load is heavy and the power supply capacity is tight. This type of substation is mainly located in industrial parks. The line load rate is high, which can be solved by replacing large-capacity main transformers, switching loads to other substations, and building new substations. The load rate and interval utilization rate of the third quadrant substation are both low. This type of substation is usually due to the expected load has not yet fully formed scale. This type of substation is mainly divided into three situations. Scenario 1: For substations that have been in operation for less than three years, the load rate and interval utilization rate are low mainly because they are newly put into operation and the load has not yet fully increased. In this case, no additional processing is required for the time being, and it is enough to wait for the load to explode. Scenario 2: For substations that have been in operation for three to five years, the load rate and interval utilization rate are low mainly because the load in the surrounding area is relatively scattered and the land has not been fully developed. In this case, it is possible to consider expanding the substation supply area and incorporating more users. Scenario 3: For substations that have been in operation for more than five years or even more than eight years, although the load rate has increased, it has not yet reached the expected level. The natural growth rate of the load in its supply area has been small, indicating that there are problems with the substation layout. In this case, it is possible to consider replacing a small-capacity main transformer. The fourth quadrant substation has a high interval utilization, a low load rate, and the lowest interval utilization efficiency. This type of substation is mainly divided into four situations. The first situation is the supply area factor. The substation supplies the township area, where the load growth is not large and is relatively scattered, resulting in more lines between substations, but a low load rate. In this case, the substation can predict the future load development space. If the future load growth is limited, it can be considered to replace it with a small-capacity main transformer with tight power supply capacity, so that both main transformers can operate efficiently; the second situation is policy reasons. The community power supply lines in Suqian are funded by the government, but one line only supplies a few communities, and the load cannot be increased, resulting in a waste of resources. This phenomenon is more prominent in urban areas. In this case, the substation can consider negotiating with the government to merge low-load rate lines, recover dedicated line assets, or connect to other government investment projects nearby to improve line utilization; the third situation is that the substation is newly put into operation (including the newly stepped-up transformation substation), and the load has not yet reached a scale. In this case, the substation does not need to deal with it and can wait for the load to grow; the fourth situation is other reasons, including planned retirement, factory capacity reduction, etc. In this case, the substation will conduct a specific analysis based on the specific reasons.

[0041] Management level. For substations that no longer have spare bays in the list, the project management center shall formulate a bay integration and utilization plan to free up 1~2 bays in use and convert them into spare bays; for substations in the supply area where land development has matured, or the grid target grid has been built, or the main supply area is rural areas, 0~1 spare bays may be retained as appropriate. After the application for the activation of the spare bay is approved, the status is changed to the standby bay, and it should be put into operation as soon as possible according to the application instructions. For the standby bay that has not been put into operation within half a year after the application is approved, the control center will adjust the bay status back to the standby bay and update and maintain the bay information. For the activation of the substation standby bay, the urgency should be considered when verifying the additional demand for the bay. The standby bay should not be activated when the problem can be solved by merging the existing low-efficiency bays. For substations to be put into operation, the focus should be on advanced planning and fine control of the 10 (20) kV bays of the substation based on information such as supply area division, load demand, and grid construction.

[0042] To sum up, with the help of the above-mentioned technical scheme of the present invention, the substation interval resources are analyzed by the four-quadrant analysis method, a substation interval resource utilization model is established, and the substations with interval utilization problems are obtained. Then, the causes of the substations with interval resource utilization problems are analyzed, and finally, optimization ideas and optimization methods are proposed, which solves the problem of imperfect substation interval utilization in traditional distribution network planning methods, improves the utilization efficiency and management of power grid intervals, and effectively improves the operation efficiency of the power system.

[0043] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A substation interval resource optimization system, characterized in that: include: Creation module: used to divide the substation into four quadrants by four-quadrant analysis method; Specifically: construct four quadrants with the interval utilization rate as the horizontal axis and the substation load rate as the vertical axis; Improve the four quadrants, consider the appropriate power supply capacity of the substation and the substation passing the "N-1" verification, select the interval occupancy rate of 70% and the load rate of 50% to construct the four-quadrant boundaries, and add a reasonable distribution interval of substations; Analysis module: used to analyze the substation causes of problems in bay resource utilization; Optimization module: It is used to form corresponding resource optimization strategies for four-quadrant substations in different situations from both technical and management levels, and realize overall planning and scientific decision-making on the use of interval resources.

2. The substation interval resource optimization system according to claim 1, characterized in that: The first quadrant is characterized by a high interval utilization rate and a load rate greater than 80%, indicating that this type of substation has hidden dangers in safe operation; the second quadrant is characterized by a high load rate but a low interval utilization rate, indicating that this type of substation has a high operating efficiency but the interval resources have not been fully released; the third quadrant is characterized by a low interval utilization rate and a low load rate, indicating that this type of substation needs to be checked to see if it is a newly built substation; the fourth quadrant is characterized by a high interval utilization rate but a low load rate, indicating that this type of substation has a low operating efficiency and needs to focus on analyzing the reasons and formulating solutions.

3. The substation interval resource optimization system according to claim 2, characterized in that: The upper boundary of the four-quadrant boundary is 80% load rate of the substation heavy load line, and the right boundary is 100% interval occupancy rate.

4. The substation interval resource optimization system according to claim 2, characterized in that: The left boundary of the four-quadrant boundary is that all the outgoing line intervals are set to be overloaded. When the interval utilization rate reaches a certain level, the substation will be overloaded. At this time, the coordinate origin and the critical point are connected to form a line as the left boundary; the origin is 0 outgoing line and 0 load rate; the critical point is 60% interval utilization rate and 80% load rate.

5. The substation interval resource optimization system according to claim 2, characterized in that: The lower boundary of the four-quadrant boundary is to assume that all the outgoing lines of the substation interval are lightly loaded. At this time, the coordinate origin and the critical point are connected to form a line as the lower boundary; the origin is 0 outgoing lines and 0 load rate; the critical point is 100% interval utilization rate and 35% load rate.

6. A method for optimizing substation interval resources, characterized in that: The steps include: S1 divides the substation into four quadrants through the four-quadrant analysis method; constructs four quadrants with the interval utilization rate as the horizontal axis and the substation load rate as the vertical axis; improves the four quadrants, considers the appropriate power supply capacity of the substation and the substation passes the "N-1" verification, selects the interval occupancy rate of 70% and the load rate of 50% to construct the four-quadrant boundaries, and adds a reasonable substation distribution interval; S2 Analyze the substation causes of problems in bay resource utilization; S3 forms corresponding resource optimization strategies for four-quadrant substations in different situations from both technical and management perspectives, and realizes overall planning and scientific decision-making on the use of interval resources.

7. The substation interval resource optimization method according to claim 6, characterized in that: The first quadrant is characterized by a high interval utilization rate and a load rate greater than 80%, indicating that this type of substation has hidden dangers in safe operation; the second quadrant is characterized by a high load rate but a low interval utilization rate, indicating that this type of substation has a high operating efficiency but the interval resources have not been fully released; the third quadrant is characterized by a low interval utilization rate and a low load rate, indicating that this type of substation needs to be checked to see if it is a newly built substation; the fourth quadrant is characterized by a high interval utilization rate but a low load rate, indicating that this type of substation has a low operating efficiency and needs to focus on analyzing the reasons and formulating solutions.

8. The substation interval resource optimization method according to claim 7, characterized in that: The upper boundary of the four-quadrant boundary is 80% load rate of the substation heavy load line, and the right boundary is 100% interval occupancy rate.

9. The substation interval resource optimization method according to claim 7, characterized in that: The left boundary of the four-quadrant boundary is that all the outgoing line intervals are set to be overloaded. When the interval utilization rate reaches a certain level, the substation will be overloaded. At this time, the coordinate origin and the critical point are connected to form a line as the left boundary; the origin is 0 outgoing line and 0 load rate; the critical point is 60% interval utilization rate and 80% load rate.

10. The substation interval resource optimization method according to claim 7, characterized in that: The lower boundary of the four-quadrant boundary is to assume that all the outgoing lines of the substation interval are lightly loaded. At this time, the coordinate origin and the critical point are connected to form a line as the lower boundary; the origin is 0 outgoing lines and 0 load rate; the critical point is 100% interval utilization rate and 35% load rate.

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