A method for quantifying the transfer power supply capacity of a distribution network and a related device

Abstract

The present application discloses a method for quantifying the transfer power supply capacity of a distribution network and a related device, the method comprising: segmenting the target distribution network into trunk lines and branch lines according to the layout of the automated circuit breaker to obtain multiple transfer power supply line sections; counting the total number of transfer power supply users in other sections of the target distribution network in each transfer power supply line section during the fault stage; calculating the self-healing rate of each transfer power supply line section according to the total number of transfer power supply users, and taking the minimum self-healing rate as a quantitative indicator of the transfer power supply capacity of the target distribution network. The self-healing rate in the present application is refined to each section of the feeder line, which can accurately reflect the transfer power supply and restoration capacity of each section line, reduce the granularity of the description indicator, and be more targeted. Therefore, the present application can alleviate the technical problem that the indicator granularity of the prior art is too large, lacks pertinence, and cannot accurately reflect the actual transfer power supply capacity of the distribution network.

Description

Technical Field

[0001] The present application relates to the technical field of power transfer capacity analysis of a distribution network, and in particular to a method for quantifying the power transfer capacity of a distribution network and a related device. Background Art

[0002] With the in-depth application of distribution automation technology, the operation and management requirements of distribution networks in various places have also been upgraded, and indicators such as power supply reliability have been proposed in the field of operation and management of distribution networks. In particular, in terms of the transfer capacity of the distribution network, the transfer capacity has been greatly improved through the extensive application of distribution automation. The specific principle is: by configuring automated circuit breakers at key nodes of the feeder, using optical fiber or encrypted wireless communication to access the automation master station, in the event of a fault, the segmented automated switch will remove the fault on-site according to the current time difference (pre-isolation), the master station will summarize and analyze the tripping and alarm information of each switch, automatically locate the fault point, and automatically remotely control the corresponding switch to isolate the fault to the smallest section according to the best self-healing strategy, and then restore the supply to the non-fault section through remote control closing, thus realizing automatic removal of the fault and power supply restoration.

[0003] The current evaluation of the power supply transfer capacity of the distribution network is for the entire target area, that is, the indicator evaluation object is for the entire line area, and no analysis is performed on the feeder segment, resulting in a mismatch between the theoretical analysis and the actual power supply transfer capacity, and the selected evaluation indicators are distorted. Summary of the invention

[0004] The present application provides a method and related device for quantifying the power transfer capacity of a distribution network, which are used to alleviate the technical problems in the prior art that the indicator granularity is too large, lacks specificity, and cannot accurately reflect the actual power transfer capacity of the distribution network.

[0005] In view of this, the first aspect of the present application provides a method for quantifying the power transfer capacity of a distribution network, comprising:

[0006] The target distribution network is segmented into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections;

[0007] Counting the total number of users who have their power restored in other sections of the target distribution network during the fault phase of each of the power transfer line sections;

[0008] The self-healing rate of each of the power transfer line sections is calculated according to the total number of power transfer and restoration users, and the minimum self-healing rate is used as a quantitative indicator of the power transfer capacity of the target distribution network.

[0009] Optionally, the target distribution network is segmented into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections, including:

[0010] According to the location points of the automatic circuit breakers on the trunk line of the target distribution network, the trunk line is segmented to obtain the power supply trunk line section;

[0011] Segmenting the branch line according to the position points of the automatic circuit breakers on the branch line associated with the trunk line to obtain power supply branch line sections;

[0012] The power transfer line section includes the power transfer trunk line section and the power transfer branch line section.

[0013] Optionally, the self-healing rate of each of the power transfer line sections is calculated according to the total number of power transfer restoration users, and the minimum self-healing rate is used as a quantitative indicator of the power transfer capacity of the target distribution network, and then further includes:

[0014] The target distribution network is analyzed and evaluated for its power transfer capacity according to the power transfer point capacity quantification index to obtain an evaluation result.

[0015] Optionally, the power transfer capacity of the target distribution network is analyzed and evaluated according to the power transfer point capacity quantification index to obtain an evaluation result, and then the method further includes:

[0016] The distribution points of the automated circuit breakers in the target distribution network are adjusted according to the evaluation results.

[0017] A second aspect of the present application provides a device for quantifying the power transfer capacity of a distribution network, comprising:

[0018] A block division unit is used to segment the target distribution network into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections;

[0019] A fault statistics unit, used for counting the total number of users who are restored to power in other sections of the target distribution network during the fault phase of each of the power transfer line sections;

[0020] The quantitative calculation unit is used to calculate the self-healing rate of each of the power transfer line sections according to the total number of power transfer and restoration users, and use the minimum self-healing rate as a quantitative indicator of the power transfer capacity of the target distribution network.

[0021] Optionally, the block division unit is specifically used to:

[0022] According to the location points of the automatic circuit breakers on the trunk line of the target distribution network, the trunk line is segmented to obtain the power supply trunk line section;

[0023] Segmenting the branch line according to the position points of the automatic circuit breakers on the branch line associated with the trunk line to obtain power supply branch line sections;

[0024] The power transfer line section includes the power transfer trunk line section and the power transfer branch line section.

[0025] Optionally, also include:

[0026] The evaluation unit is used to analyze and evaluate the power transfer capacity of the target distribution network according to the quantitative index of the transfer point capacity to obtain an evaluation result.

[0027] Optionally, also include:

[0028] The optimization unit is used to adjust the layout of the automatic circuit breakers in the target distribution network according to the evaluation result.

[0029] A third aspect of the present application provides a device for quantifying the power transfer capacity of a distribution network, the device comprising a processor and a memory;

[0030] The memory is used to store program code and transmit the program code to the processor;

[0031] The processor is used to execute the method for quantifying the power transfer capacity of the distribution network described in the first aspect according to the instructions in the program code.

[0032] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the method for quantifying the power transfer capacity of the distribution network described in the first aspect.

[0033] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0034] In the present application, a method for quantifying the power transfer capacity of a distribution network is provided, comprising: segmenting a target distribution network into trunk lines and branch lines according to the layout of an automated circuit breaker to obtain a plurality of power transfer line sections; counting the total number of users who are restored to power in other sections of the target distribution network during the fault phase of each power transfer line section; calculating the self-healing rate of each power transfer line section according to the total number of users who are restored to power, and taking the minimum self-healing rate as a quantitative indicator of the power transfer capacity of the target distribution network.

[0035] The method for quantifying the transfer power supply capacity of the distribution network provided in this application, in order to be able to conduct a more detailed quantitative analysis of the entire target distribution network, divides the target distribution network into multiple transfer power supply line sections, and then calculates the self-healing rate for each section. The self-healing rate in this application is refined to each section of the feeder line, which can accurately reflect the transfer power supply and restoration capacity of each section line, reduce the granularity of the description index, and be more targeted. Therefore, this application can alleviate the technical problem that the granularity of the index of the prior art is too large, lacks pertinence, and cannot accurately reflect the actual transfer power supply capacity of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a flow chart of a method for quantifying the power transfer capacity of a distribution network provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a device for quantifying the power transfer capacity of a distribution network provided in an embodiment of the present application;

[0038] Figure 3 This is an example diagram of the distribution network automation circuit breaker layout provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] For easier understanding, see Figure 1 , an embodiment of a method for quantifying the power transfer capacity of a distribution network provided in the present application includes:

[0041] Step 101: segment the target distribution network into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections.

[0042] Furthermore, step 101 includes:

[0043] According to the location points of the automatic circuit breakers on the trunk line of the target distribution network, the trunk line is segmented to obtain the power supply trunk line section;

[0044] The branch line is segmented according to the position points of the automatic circuit breakers on the branch line associated with the trunk line to obtain the power supply branch line sections;

[0045] The power transfer line section includes the power transfer trunk line section and the power transfer branch line section.

[0046] See also Figure 3 , Figure 3This is an example of a target distribution network, which includes feeder 701, the trunk line where the automatic circuit breakers T10, T20 and T30 are located, and the branch lines where the automatic circuit breakers T5, T9 and T19 are located, and the branch line where the automatic circuit breaker T15 is located; in addition, T30 and T19 are automated contact points, that is, they are usually connected to other feeders in a normally open state, and in the event of a fault, the power supply can be transferred by closing the switch.

[0047] The connection point from the outgoing line switch of the substation to another feeder is set as the trunk line, the automatic circuit breaker on the trunk line is set as the segmentation point, and each segment is set as a trunk section; and the branch line divided by the automatic circuit breaker on the non-trunk line is divided into an independent branch section. Each connected line and equipment formed by the automatic circuit breaker forms a trunk section and a branch section according to this rule, which can be collectively called a block.

[0048] Compared with ordinary switches, automated circuit breakers can achieve faster and more remote programmed operations. Therefore, when evaluating the contribution of distribution network automation construction to the medium-voltage fault power transfer capacity and the rationality of the grid, only automated circuit breakers are used as the block boundaries of the line. Each automated circuit breaker can be opened and closed through remote control of the automation master station to achieve isolation or power transfer for each block. Since there are only ordinary switches inside the block and it does not have remote control capabilities, it can be viewed as a whole.

[0049] Step 102: Count the total number of users who are restored to power in other sections of the target distribution network for each power transfer line section during the fault phase.

[0050] The fault stage of each power transmission line section refers to the situation where a single fault occurs in the distribution network; in the above example, 6 different blocks are given, that is, 6 different power transmission line sections; a single fault occurs when a few households in a block have faults. Figure 3 The segment division shown can make the following simulation assumptions for the total number of users who are restored to electricity:

[0051] Assume that block 1 fails and 2 households lose voltage, and the other 38 households can be restored to power;

[0052] Assuming that block 2 fails and 14 households lose voltage, the other 26 households can be restored to power;

[0053] Assume that block 3 fails and 8 households lose voltage, and the other 32 households can be restored to power;

[0054] Assuming that block 4 fails and 7 households lose voltage, the remaining 33 households can be restored to power;

[0055] Assuming that block 5 fails and 9 households lose voltage, the remaining 31 households can be restored to power;

[0056] Assuming that block 6 fails and 4 households lose voltage, it is counted that the other 36 households can be restored to power.

[0057] Step 103: Calculate the self-healing rate of each power transfer line section according to the total number of power transfer restoration users, and use the minimum self-healing rate as a quantitative indicator of the power transfer capacity of the target distribution network.

[0058] The calculation of the self-healing rate is to find the ratio of the total number of users who need to be restored to power to the total number of users in the target distribution network area. According to the above fault hypothesis example, the total number of users in the target distribution network area is 40. The self-healing rates under different conditions can be calculated as follows: 38 / 40=95%, 26 / 40=65%, 32 / 40=80%, 33 / 40=82.5%, 31 / 40=77.5%, 36 / 40=90%. The calculated self-healing rates are arranged in descending order. The self-healing rate ranked first has the smallest self-healing rate, which is the quantitative index value of the power transfer capacity of the target distribution network; the quantitative index value of the power transfer capacity in this example is 65%. The above example is only one case in the embodiment method. The method provided in this embodiment is also applicable to more complex distribution networks, and the specific process will not be repeated.

[0059] Furthermore, step 103 further includes:

[0060] According to the quantitative indicators of the transfer point capacity, the target distribution network's power transfer capacity is analyzed and evaluated to obtain the evaluation results.

[0061] A suitable evaluation method or evaluation standard can be selected according to the quantitative index of the power transfer capacity to describe the power transfer capacity of the target distribution network. The specific evaluation can be implemented based on the existing technology and will not be elaborated here.

[0062] Further, the power transfer capacity of the target distribution network is analyzed and evaluated according to the quantitative index of the transfer point capacity to obtain the evaluation result, and then the following steps are included:

[0063] Adjust the layout of automated circuit breakers in the target distribution network based on the evaluation results.

[0064] Using the evaluation results to optimize the layout of automated circuit breakers in the distribution network can improve the power transfer and restoration capabilities of the distribution network, reduce the number of power outages for users during the fault phase, and reduce the resulting losses.

[0065] The method for quantifying the transfer power supply capacity of the distribution network provided in the embodiment of the present application, in order to be able to perform a more detailed quantitative analysis of the entire target distribution network, divides the target distribution network into multiple transfer power supply line sections, and then calculates the self-healing rate for each section. The self-healing rate in this embodiment is refined to each section of the feeder line, which can accurately reflect the transfer power supply and restoration capacity of each section line, reduce the granularity of the description index, and be more targeted. Therefore, this embodiment can alleviate the technical problem that the granularity of the index in the prior art is too large, lacks pertinence, and cannot accurately reflect the actual transfer power supply capacity of the distribution network.

[0066] For easier understanding, see Figure 2 The present application provides an embodiment of a device for quantifying the power transfer capacity of a distribution network, including:

[0067] The block division unit 201 is used to segment the target distribution network into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections;

[0068] A fault statistics unit 202 is used to count the total number of users who are restored to power in other sections of the target distribution network during the fault phase of each power transfer line section;

[0069] The quantitative calculation unit 203 is used to calculate the self-healing rate of each power transfer line section according to the total number of power transfer restoration users, and use the minimum self-healing rate as a quantitative indicator of the power transfer capacity of the target distribution network.

[0070] Furthermore, the block division unit 201 is specifically used for:

[0071] According to the location points of the automatic circuit breakers on the trunk line of the target distribution network, the trunk line is segmented to obtain the power supply trunk line section;

[0072] The branch line is segmented according to the position points of the automatic circuit breakers on the branch line associated with the trunk line to obtain the power supply branch line sections;

[0073] The power transfer line section includes the power transfer trunk line section and the power transfer branch line section.

[0074] Furthermore, it also includes:

[0075] The evaluation unit 204 is used to analyze and evaluate the power transfer capacity of the target distribution network according to the power transfer point capacity quantification index to obtain an evaluation result.

[0076] Furthermore, it also includes:

[0077] The optimization unit 205 is used to adjust the layout of the automatic circuit breakers in the target distribution network according to the evaluation result.

[0078] The present application also provides a device for quantifying the power transfer capacity of a distribution network, the device comprising a processor and a memory;

[0079] The memory is used to store the program code and transmit the program code to the processor;

[0080] The processor is used to execute the method for quantifying the power transfer capacity of the distribution network in the above method embodiment according to the instructions in the program code.

[0081] The present application also provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the method for quantifying the power transfer capacity of the distribution network in the above method embodiment.

[0082] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0083] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0084] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0085] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for executing all or part of the steps of the method described in each embodiment of the present application through a computer device (which can be a personal computer, a server, or a network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0086] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for quantifying the power transfer capacity of a distribution network, characterized in that: include: The target distribution network is segmented into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections. The specific process is as follows: According to the location points of the automatic circuit breakers on the trunk line of the target distribution network, the trunk line is segmented to obtain the power supply trunk line section; Segmenting the branch line according to the position points of the automatic circuit breakers on the branch line associated with the trunk line to obtain power supply branch line sections; The power transfer line section includes the power transfer trunk line section and the power transfer branch line section; Counting the total number of users who have their power restored in other sections of the target distribution network during the fault phase of each of the power transfer line sections; Calculate the self-healing rate of each of the power transfer line sections according to the total number of power transfer users, and use the minimum self-healing rate as a quantitative indicator of the power transfer capacity of the target distribution network; Performing power transfer capacity analysis and evaluation on the target distribution network according to the power transfer capacity quantitative index to obtain an evaluation result; The distribution points of the automated circuit breakers in the target distribution network are adjusted according to the evaluation results.

2. A device for quantifying the power transfer capacity of a distribution network, characterized in that: include: The block division unit is used to segment the target distribution network into trunk lines and branch lines according to the layout of the automatic circuit breaker to obtain multiple power supply line sections. The block division unit is specifically used to: According to the location points of the automatic circuit breakers on the trunk line of the target distribution network, the trunk line is segmented to obtain the power supply trunk line section; Segmenting the branch line according to the position points of the automatic circuit breakers on the branch line associated with the trunk line to obtain power supply branch line sections; The power transfer line section includes the power transfer trunk line section and the power transfer branch line section; A fault statistics unit, used for counting the total number of users who are supplied with power in other sections of the target distribution network during the fault phase of each of the power supply line sections; A quantitative calculation unit, used to calculate the self-healing rate of each of the power transfer line sections according to the total number of power transfer and restoration users, and use the minimum self-healing rate as a quantitative indicator of the power transfer capacity of the target distribution network; An evaluation unit, configured to analyze and evaluate the power transfer capacity of the target distribution network according to the power transfer capacity quantitative index, and obtain an evaluation result; The optimization unit is used to adjust the layout of the automatic circuit breakers in the target distribution network according to the evaluation result.

3. A device for quantifying the power transfer capacity of a distribution network, characterized in that: The device comprises a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the method for quantifying the power transfer capacity of the distribution network according to claim 1 according to the instructions in the program code.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program code, and the program code is used to execute the method for quantifying the power transfer capacity of the distribution network according to claim 1.

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