A method and apparatus for analyzing light loads in substations

Abstract

This invention discloses a method and apparatus for light-load analysis of substations. It performs a primary light-load analysis by acquiring the rated capacity of different transformers within the substation. When the rated capacities of different transformers are the same, it determines whether the main transformer load rate is balanced. If the main transformer load rate is balanced, a secondary light-load analysis is performed, and the results are output. By performing a hierarchical state analysis of the substation, the accuracy of analyzing the causes of light loads can be improved, thereby analyzing the deeper causes of light loads in the substation. Different remedial measures are required for the identified problems, effectively identifying the causes of light loads in the substation and providing solutions.

Description

Technical Field

[0001] This invention relates to the field of substation light load problem analysis technology, and in particular to a substation light load analysis method and apparatus. Background Technology

[0002] With rapid economic development, the planning and optimization of power grids have received increasing attention. However, light-load problems frequently occur in 220kV-35kV substations. The causes of light loads in substations are varied, and the corresponding solutions differ depending on the cause. Typically, analyzing substation data by professionals is required to determine the cause of the light load and then identify a suitable solution. While professional analysis and judgment can effectively resolve light load issues, it is inefficient and increases the workload for professionals, resulting in the inefficient resolution of substation light-load problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and apparatus for analyzing light load in substations, which can effectively identify the causes of light load in substations and provide solutions.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for light-load analysis of substations, comprising the following steps:

[0006] Obtain the rated capacity of different transformers in the substation and perform a primary light-load analysis on the substation;

[0007] Determine whether the rated capacity of different transformers is the same. If so, determine whether the load rate of the transformers is balanced. If not, output the analysis results.

[0008] If the load is balanced, a secondary light load analysis is performed on the substation, and the results of the secondary light load analysis are output.

[0009] Based on the analysis results, obtain the preset solution corresponding to the analysis results.

[0010] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows:

[0011] A substation light-load analysis device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the various steps of the substation light-load analysis method described above.

[0012] The beneficial effects of this invention are as follows: by obtaining the rated capacity of different transformers in the substation, a primary light load analysis of the substation is performed. When the rated capacity of different transformers is the same, it is determined whether the main transformer load rate is balanced. When the main transformer load rate is balanced, a secondary light load analysis of the substation is performed, and the results of the secondary light load analysis are output. By performing a hierarchical state analysis of the substation, the accuracy of the analysis of the causes of light load can be improved, thereby analyzing the deep-seated causes of light load in the substation. For the problems identified, different governance measures need to be adopted to deal with the problems, thus effectively identifying the causes of light load in the substation and providing solutions. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating the steps of a substation light-load analysis method according to an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of a substation light-load analysis device according to an embodiment of the present invention;

[0015] Figure 3 This is a flowchart of another step in a substation light-load analysis method according to an embodiment of the present invention. Detailed Implementation

[0016] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0017] Please refer to Figure 1 A method for analyzing light-load conditions in substations, comprising the following steps:

[0018] Obtain the rated capacity of different transformers in the substation and perform a primary light-load analysis on the substation;

[0019] Determine whether the rated capacity of different transformers is the same. If so, determine whether the load rate of the transformers is balanced. If not, output the analysis results.

[0020] If the load is balanced, a secondary light load analysis is performed on the substation, and the results of the secondary light load analysis are output.

[0021] Based on the analysis results, obtain the preset solution corresponding to the analysis results.

[0022] As described above, the beneficial effects of this invention are as follows: by obtaining the rated capacity of different transformers in the substation, a primary light load analysis of the substation is performed. When the rated capacity of different transformers is the same, it is determined whether the main transformer load rate is balanced. When the main transformer load rate is balanced, a secondary light load analysis of the substation is performed, and the results of the secondary light load analysis are output. By performing a hierarchical state analysis of the substation, the accuracy of the analysis of the causes of light load can be improved, thereby analyzing the deep-seated causes of light load in the substation. For the problems identified, different governance measures need to be adopted to handle the problems, thus effectively identifying the causes of light load in the substation and providing solutions.

[0023] Furthermore, determining whether the transformer load rate is balanced includes:

[0024] Calculate the transformer load rate according to the transformer load rate calculation formula;

[0025] Where cos∮ is the power factor; U is the voltage; and I is the feeder current.

[0026] Determine whether the difference in transformer load rate between different transformers at the same time is greater than 50%. If not, it is unbalanced, and the result of the uneven transformer load rate is output.

[0027] As described above, the transformer load rate is calculated by acquiring the transformer voltage, feeder current value, and transformer capacity under a preset power factor. Based on the obtained transformer load rate, it is determined whether the difference in transformer load rate between different transformers at the same time is greater than 50%. When the result is unbalanced, the result of uneven transformer load rate is output, so that the substation can adjust the transformer load rate according to the output result to solve the light load problem.

[0028] Furthermore, determining whether the rated capacities of different transformers are the same includes:

[0029] If the rated capacities of different transformers are not the same, then determine whether the load rates of the transformers are balanced. If they are balanced, then no solution is needed.

[0030] If the load is uneven, the result of the uneven transformer load rate will be output.

[0031] As can be seen from the above description, when the main transformer load rate is determined to be balanced, it means that there is no light load problem in the current substation, and the substation does not need to operate; when the result is unbalanced, the result of the uneven main transformer load rate is output, so that the substation can adjust the transformer load rate according to the output result to solve the light load problem.

[0032] Furthermore, the secondary light-load analysis of the substation includes:

[0033] Obtain the number of transformer bays already in use and the total number of transformer bays in the substation;

[0034] The substation's bay utilization rate is obtained based on the number of transformer bays already in use and the total number of transformer bays.

[0035] Determine whether the interval utilization rate is within a preset range. If it is less than the preset range, conduct a production analysis; if it is greater than the preset range, conduct a dedicated line ratio analysis.

[0036] As described above, the substation bay utilization rate is calculated by obtaining the number of used transformer bays and the total number of transformer bays in the substation. Based on the bay utilization rate, it is determined whether the substation is within the normal operating range. If it is lower than the normal operating range, a commissioning analysis is performed; if it exceeds the normal operating range, a dedicated line ratio analysis is performed. This allows for different analyses to be performed for different operating conditions of the substation, improving the accuracy of the analysis of light load problems in substations.

[0037] Furthermore, the production launch analysis includes:

[0038] Obtain the planning information and commissioning date of the substation;

[0039] Determine whether the commissioning date is less than the preset commissioning time. If so, determine that the substation is a newly commissioned substation; otherwise, output planning items based on the planning information.

[0040] As described above, by obtaining the planning information and commissioning date of the substation, if the commissioning date of the substation is less than the preset commissioning time, it is determined to be a newly commissioned substation. That is, it is acceptable for a newly commissioned substation to encounter light load problems in the initial stage. However, if it is determined to be a non-newly commissioned substation, the planning information is used to determine whether the project is hindered, and reasonable planning matters are specified according to the planning information to solve the light load problem.

[0041] Furthermore, the analysis of the proportion of dedicated lines includes:

[0042] Obtain the dedicated line load and bus load of the substation;

[0043] The dedicated line load rate is obtained based on the dedicated line load and the bus load.

[0044] Determine whether the dedicated line load rate is greater than a preset value. If yes, perform resource analysis; otherwise, perform regional load analysis.

[0045] As described above, by acquiring the dedicated line load and bus load of the substation and calculating the dedicated line load rate, the current working status of the substation is determined based on the magnitude of the dedicated line load rate. If it is lower than the preset load rate value, a regional load analysis is performed; if it is higher than the preset load rate value, a dedicated line proportion analysis is performed. This allows for different analyses to be performed for different dedicated line load rates in the substation, improving the accuracy of the analysis of the substation's light load problem.

[0046] Furthermore, the resource analysis includes:

[0047] Obtain the load rate of each line in the substation;

[0048] The average load rate of the dedicated line is obtained by averaging the load rates of each line.

[0049] Determine whether the average load rate of the dedicated line is greater than the threshold load rate. If not, determine that the dedicated line is occupying excess power grid resources and issue a comprehensive power supply command to the dedicated line.

[0050] As described above, by obtaining the load rate of each line in the substation and calculating the average load rate of the dedicated line based on the arithmetic mean of the load rates of each line, the current working status of the substation is determined based on the magnitude of the average load rate of the dedicated line. If it is lower than the threshold load rate, it is determined that the dedicated line is occupying excess grid resources, and comprehensive power supply is implemented for the dedicated line. That is, when the average load rate of the dedicated line is low, a power supply suggestion for dedicated line users with long-term low load rates is given to solve the problem of light load in the substation caused by the low average load rate of the dedicated line.

[0051] Furthermore, the regional load analysis includes:

[0052] Obtain the area information of the substation, determine whether the substation is a new area, and if not, issue a substation access command to connect the substation in the same area.

[0053] As described above, by obtaining the regional information of the substation, when the maturity of the area is determined to be that of a new area, the future load development needs of the new area are fully considered, and the light load problem in the new area can be left unresolved to meet the construction needs of the new area; while when the maturity of the area is determined to be that of a new area, it indicates that the area is a slow-developing area, and the load of the area is increased by guiding the substations in the same area to connect, thereby solving the light load problem of the substation.

[0054] Furthermore, the regional load analysis also includes:

[0055] Based on the substation's regional information, determine whether the substation is located in a special load area; if so, do not resolve the issue.

[0056] As can be seen from the above description, when there are special loads in the analyzed area, they will not be addressed. For example, the convention and exhibition substation in a certain area is a special load substation that requires dedicated power supply to meet special power supply needs. Therefore, considering the special nature of the substation, its light load problem will not be addressed, thus meeting the needs of substations with different purposes.

[0057] Please refer to Figure 2 Another embodiment of the present invention provides a substation light load analysis device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the various steps of the substation light load analysis method described above.

[0058] The substation light load analysis method and apparatus of the present invention can accurately analyze the light load problem in substations caused by different reasons, analyze the underlying causes of the light load, and adopt different treatment measures to deal with the problems found. The following is a detailed description of the specific implementation:

[0059] Example 1

[0060] Please refer to Figure 1 and Figure 3 A method for analyzing light-load conditions in substations, comprising the following steps:

[0061] S1. Obtain the rated capacity of different transformers in the substation and perform a primary light load analysis on the substation; the rated capacity of the transformer is also called the main transformer capacity, which is a measurable parameter of the transformer, such as the main transformer capacity of 50MVA = 50 * 1,000,000VA.

[0062] S2. Determine whether the rated capacity of different transformers is the same. If so, determine whether the load rate of the transformers is balanced. If not, output the analysis result. Specifically, calculate the load rate of the transformers according to the transformer load rate calculation formula.

[0063]

[0064] Where cos∮ is the power factor, i.e., the cosine function of the phase difference between voltage and current; U is the voltage, such as 35kV; I is the feeder current value, I = line load of each feeder * load rate; since the transformer uses a delta connection, the line current of the load is equal to The phase current is doubled, and the line voltage of the load with a star connection is equal to... The phase voltage multiplication formula uses the line current and line voltage of the load, therefore, additional parameters are needed.

[0065] Based on the calculation results, determine whether the difference in transformer load rate corresponding to different transformers at the same time is greater than 50%. If not, it is unbalanced, and the result of the uneven transformer load rate is output.

[0066] If the rated capacities of different transformers are not the same, it is determined whether the load rates of the transformers are balanced. If they are balanced, no action is taken; if they are unbalanced, the result of the uneven load rates of the transformers is output. That is, a difference greater than 50% indicates that the load levels of different transformers are too different.

[0067] S3. If the load is balanced, perform a secondary light load analysis on the substation and output the results. Specifically:

[0068] The process involves obtaining the number of transformer bays already in use and the total number of transformer bays within the substation; determining the bay utilization rate based on these figures; judging whether the bay utilization rate falls within a preset range; if it is less than the preset range, a commissioning analysis is performed; if it is greater than the preset range, a dedicated line ratio analysis is performed; for example, the bay utilization rate is analyzed based on the voltage level of the 220-35kV substation; if the substation voltage is 220kV, the 110kV bay utilization rate is analyzed; if the substation voltage is 110-35kV, the 10kV bay utilization rate is analyzed; and analysis is performed for two cases: bay utilization rate ≤ 30% and bay utilization rate > 70%; that is, the preset range is (30%, 70%); the bay utilization rate is the actual utilization rate, and bays that have been planned but not yet commissioned are not included in the bay utilization rate; the formula for the substation bay utilization rate is as follows:

[0069] Substation bay utilization rate = Number of bays used by main transformers in the substation / Total number of bays of main transformers in the substation;

[0070] Used bays are those with actual connected lines; the total number of bays is obtained directly from the substation by the system and does not need to be calculated.

[0071] Scenario 1: When the bay utilization rate within the substation is ≤30%, a commissioning analysis is performed:

[0072] Obtain the planning information and commissioning date of the substation; determine whether the commissioning date is less than the preset commissioning time. If so, determine that the substation is a newly commissioned substation, that is, for a newly commissioned substation, the light load problem is a normal phenomenon; if not, output planning items according to the planning information.

[0073] Specifically, in one optional implementation, the system determines whether a substation is a newly commissioned substation by obtaining the planned substation information and commissioning date from the planning project database. If the system obtains the commissioning date of the substation and the commissioning time is less than five years, the system determines that the substation is a newly commissioned substation and ignores the light load problem of the substation. If the system obtains the planning information of the substation in the planning project database but does not obtain the commissioning date of the substation, the system determines that there is a planned but not yet commissioned project for the substation, and notifies the technical personnel to determine the reason for the project's obstruction and to expedite the project's progress. If the system does not obtain the planning information and commissioning date of the substation, the system determines that there is no planned but not yet commissioned project, and notifies the technical personnel to carry out relevant project planning matters.

[0074] Scenario 2: When the utilization rate of the bay within the power station is >70%, a dedicated line proportion analysis is performed:

[0075] Obtain the dedicated line load and bus load of the substation; obtain the dedicated line load rate based on the dedicated line load and bus load; determine whether the dedicated line load rate is greater than a preset value. If so, perform resource analysis; for example, analyze and judge two cases with a preset value of 30%.

[0076] Specifically, for cases where the proportion of dedicated lines is greater than 30%, the system obtains the load rate of each line in the substation; it calculates the average load rate of the dedicated lines based on the arithmetic mean of the load rates of each line; it then determines whether the average load rate of the dedicated lines is greater than a threshold load rate. If not, it determines that the dedicated line is occupying excess grid resources and issues a comprehensive power supply command to the dedicated line; if the average load rate of all dedicated lines is less than 30%, it is determined that the dedicated line is occupying excess grid resources, and suggestions are given for setting up an extended ring main unit within the substation or for dedicated line users with consistently low load rates to share power supply. The formula for calculating the average load rate of the dedicated lines is as follows:

[0077] Average load rate of dedicated line = arithmetic mean of load rates of all lines;

[0078] Dedicated Line: Based on the public / dedicated nature of the 10kV line, the system directly obtains the corresponding attributes to determine whether the line is a public or dedicated line; Line Load Rate: The system directly obtains this information from the substation and does not require calculation.

[0079] If not, then perform regional load analysis;

[0080] Specifically, for cases where the proportion of dedicated lines is ≤30%, the system obtains the substation's regional information to determine if the substation is a new area. If not, it issues a substation access command to connect substations in the same area. Based on the substation's regional information, the system also determines if the substation is in a special load area. If so, no action is taken. For example, if the analyzed area has special loads (such as the Xiamen Convention and Exhibition Center), the system ignores the substation's light load issue. If the area's maturity is determined to be a new area, indicating early construction and future load development needs, the system ignores the substation's light load issue. If the area's maturity is determined to be a slow-developing area, it is recommended to guide loads in the same area to connect. The system also stores substations belonging to special loads and generates data on the development maturity of different areas for different years based on the input regional division chart.

[0081] S4. Obtain a preset solution corresponding to the analysis results; that is, output the solution generated above.

[0082] Example 2

[0083] Please refer to Figure 2 A substation light-load analysis device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the various steps in the substation light-load analysis method as described in Embodiment 1.

[0084] In summary, the present invention provides a substation light load analysis method and apparatus. By acquiring the main transformer capacity, transformer load rate, transformer voltage, and feeder current values ​​of the substation, the method analyzes the main transformer capacity, the balance of the main transformer load, the utilization rate of the substation bays, and the proportion of dedicated lines. Through multi-level light load analysis of the substation and providing solutions corresponding to the analysis results, the method not only improves the accuracy of the analysis of the causes of light load, but also analyzes the deeper causes of light load in the substation. Furthermore, it identifies the problems and proposes different remedial measures to address them, thus effectively identifying the causes of light load in the substation and providing solutions.

[0085] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for analyzing light-load conditions in substations, characterized in that, Including the following steps: Obtain the rated capacity of different transformers in the substation and perform a primary light-load analysis on the substation; Determine whether the rated capacity of different transformers is the same. If so, determine whether the load rate of the transformers is balanced. If not, output the analysis results. If the load is balanced, a secondary light load analysis is performed on the substation, and the results of the secondary light load analysis are output. Based on the analysis results, obtain a preset solution corresponding to the analysis results; The secondary light-load analysis of the substation includes: Obtain the number of transformer bays already in use and the total number of transformer bays in the substation; The substation's bay utilization rate is obtained based on the number of transformer bays already in use and the total number of transformer bays. Determine whether the interval utilization rate is within a preset range. If it is less than the preset range, then conduct a production analysis; if it is greater than the preset range, then conduct a dedicated line proportion analysis. The analysis of the proportion of dedicated lines includes: Obtain the dedicated line load and bus load of the substation; The dedicated line load rate is obtained based on the dedicated line load and the bus load. Determine whether the dedicated line load rate is greater than a preset value. If yes, perform resource analysis; otherwise, perform regional load analysis. The resource analysis includes: Obtain the load rate of each line in the substation; The average load rate of the dedicated line is obtained by averaging the load rates of each line. Determine whether the average load rate of the dedicated line is greater than the threshold load rate. If not, determine that the dedicated line is occupying excess power grid resources and issue a comprehensive power supply command to the dedicated line. The regional load analysis includes: Obtain the area information of the substation, determine whether the substation is a new area, and if not, issue a substation access command to connect the substation in the same area. The regional load analysis also includes: Based on the substation's regional information, determine whether the substation is located in a special load area; if so, do not resolve the issue.

2. The substation light-load analysis method according to claim 1, characterized in that, The determination of whether the transformer load rate is balanced includes: Calculate the transformer load rate according to the transformer load rate calculation formula; ;in, U is the power factor; U is the voltage; I is the feeder current. Determine whether the difference in transformer load rate between different transformers at the same time is greater than 50%. If so, it is unbalanced, and the result of the uneven transformer load rate is output.

3. The substation light-load analysis method according to claim 2, characterized in that, The determination of whether the rated capacities of different transformers are the same includes: If the rated capacities of different transformers are not the same, then determine whether the load rates of the transformers are balanced. If they are balanced, then no solution is needed. If the load is uneven, the result of the uneven transformer load rate will be output.

4. The substation light-load analysis method according to claim 1, characterized in that, The production launch analysis includes: Obtain the planning information and commissioning date of the substation; Determine whether the commissioning date is less than the preset commissioning time. If so, determine that the substation is a newly commissioned substation; otherwise, output planning items based on the planning information.

5. A substation light-load analysis device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements each step of the substation light load analysis method as described in any one of claims 1-4.

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