Method and device for adaptive adjustment of power distribution network protection

Abstract

This invention provides a method and apparatus for adaptive adjustment of distribution network protection. The method includes: determining the tower numbers according to the distance from the substation, based on the main line and branch lines respectively; re-determining the transformer capacity between any adjacent protection devices based on the determined tower numbers and change information; determining the level corresponding to the target protection device based on the principle of capacity equalization; determining the setting value of the target protection device based on the level corresponding to the target protection device and in combination with the setting rules of the main line or branch line protection devices; and remotely adjusting the target protection device if the setting value of the target protection device changes. This invention achieves real-time protection of the distribution network and automatically completes adaptive setting by monitoring the distribution network equipment in real time, obtaining change information, classifying protection devices into levels, and automatically calculating the setting value of each protection device according to the setting rules of protection devices on different lines.

Description

Technical Field

[0001] This invention relates to the field of power plant management, and more particularly to a method and apparatus for adaptive adjustment of distribution network protection. Background Technology

[0002] With the widespread use of power distribution automation equipment, after the power distribution network protection device is set with a set value, the protection device calculates the current value by measuring physical values ​​such as waveforms on the line, compares it with the set value through logical calculation, and determines whether to issue a trip signal. When a trip signal is received, the protection device performs a trip operation.

[0003] Currently, there are two main methods for setting distribution protection devices: one is to remotely set the device levels and settings by calculating the line data within the distribution automation system, and the other is to manually set the settings at the equipment site. Both methods require on-site personnel to locate all equipment lines on the distribution network, manually calculate the transformer capacity under each switch on the main and branch lines, and classify the switches according to the principle of distributing the capacity under each switch as evenly as possible. The setting values ​​for each switch are then calculated based on these switch levels. However, in distribution automation systems, setting protection devices involves a large amount of calculation, inconsistent calculation methods, and the inability to view device settings in real time. Furthermore, when lines or equipment change, the protection device settings cannot be updated in real time, making it difficult to effectively adapt to the actual applications of distribution automation. Summary of the Invention

[0004] This invention provides a method and apparatus for adaptive adjustment of distribution network protection, which solves the problems in related technologies where the calculation methods for the setting values ​​of protection devices in distribution systems are inconsistent, the setting values ​​of protection devices cannot be viewed in real time, and the setting values ​​of protection devices cannot be changed in real time when lines or equipment are changed, thus failing to effectively adapt to the actual application of distribution automation.

[0005] In a first aspect, the present invention provides a method for adaptive adjustment of distribution network protection, comprising: determining the tower numbering according to the distance from the substation, based on the main line and branch line respectively;

[0006] Based on the tower number and the change information, the transformer capacity between any adjacent protection devices is re-determined as the transformer capacity corresponding to the target protection device; all protection devices are located on the towers, and the target protection device is the protection device with the smaller tower number on which it is located; the change information includes equipment change information and line change information;

[0007] Based on the principle of equal capacity allocation and the transformer capacity corresponding to the target protection device, the level corresponding to the target protection device is determined;

[0008] Based on the level corresponding to the target protection device, and in conjunction with the setting rules of the main line protection device or the setting rules of the branch line protection device, the setting value of the target protection device is determined. The setting value of the target protection device includes the setting current and the tripping duration.

[0009] If it is determined that the setting value of the target protection device has changed compared to the set value, the target protection device is remotely adjusted.

[0010] Optionally, determining the level of the target protection device based on the capacity sharing principle and the transformer capacity corresponding to the target protection device includes:

[0011] Based on the tower number where the target protection device is located, determine whether the target protection device is located on the main line or the branch line;

[0012] If the target protection device is located on the main line, the main line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the main line level includes a maximum of three levels.

[0013] If the target protection device is located on a branch line, the branch line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the branch line level includes a maximum of three levels.

[0014] Optionally, determining the setting value of the target protection device based on the level corresponding to the target protection device, combined with the setting rules of the main line protection device or the setting rules of the branch line protection device, includes:

[0015] Determine whether the target protection device corresponds to the main line level or the branch line level.

[0016] If the target protection device corresponds to the main line level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation.

[0017] If the target protection device corresponds to a branch line level, then the setting value of the target protection device is determined based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device.

[0018] Optionally, if the target protection device corresponds to the main line protection level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation, including:

[0019] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0020] If the first trip duration is a first set value, then based on the first set value rule of the main line protection device in the set value rule of the main line protection device, and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined;

[0021] If the first trip duration is the second set value, then based on the main line second set value rule in the set value rule of the main line protection device and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined.

[0022] The first fixed value is greater than the second fixed value.

[0023] Optionally, if the first tripping duration is a first set value, then based on the first set value rule of the main line in the set value rule of the main line protection device and the main line level of the target protection device, determining the set value current and tripping duration of the target protection device includes:

[0024] Determine the specific level of the main line protection system of the target protection device;

[0025] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the first multiple of the rated current, and the tripping time is the second tripping time;

[0026] If the target protection device belongs to the second level of the main line, then the set current of the target protection device is determined to be the second multiple of the rated current, and the tripping time is the third tripping time;

[0027] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the third multiple of the rated current, and the tripping time is the fourth tripping time.

[0028] The first multiple, the second multiple, and the third multiple decrease sequentially, and the first set value, the second trip duration, the third trip duration, and the fourth trip duration decrease sequentially.

[0029] Optionally, if the first tripping duration is a second set value, then based on the mainline protection device's setting rules and the target protection device's mainline level, determining the target protection device's set current and tripping duration includes:

[0030] Determine the specific level of the main line protection system of the target protection device;

[0031] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the fourth multiple of the rated current, and the tripping time is the fifth tripping time.

[0032] If the target protection device belongs to the secondary level of the main line, then the set current of the target protection device is determined to be the fifth multiple of the rated current, and the tripping time is the sixth tripping time;

[0033] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the sixth multiple of the rated current, and the tripping time is the seventh tripping time;

[0034] The fourth, fifth, and sixth multiples decrease sequentially, as do the second set value, the fifth trip duration, the sixth trip duration, and the seventh trip duration.

[0035] Optionally, if the target protection device corresponds to a branch line level, then based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device, the setting value of the target protection device is determined, including:

[0036] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0037] Determine the specific level of the branch protection device for the target;

[0038] If the target protection device is a branch line level one, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to the branch line level two.

[0039] If the first trip duration is a first fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is the trip duration of the first main line protection device minus the first preset value;

[0040] If the first trip duration is the second fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is zero.

[0041] The first mainline protection device is the protection device located on the mainline that exists between the substation and the target protection device.

[0042] Secondly, the present invention also provides a device for adaptive adjustment of distribution network protection, comprising:

[0043] The numbering module is used to determine the numbering of towers based on their distance from the substation, separately for main lines and branch lines;

[0044] The capacity module is used to redetermine the transformer capacity between any two adjacent protection devices based on the tower number and the change information, and use this as the transformer capacity corresponding to the target protection device; all protection devices are located on the towers, and the target protection device is the protection device with the smaller tower number on which it is located; the change information includes equipment change information and line change information;

[0045] The rating module is used to determine the rating of the target protection device based on the principle of equal capacity allocation and the transformer capacity corresponding to the target protection device.

[0046] The setting value module is used to determine the setting value of the target protection device based on the level corresponding to the target protection device and in combination with the setting rules of the main line protection device or the setting rules of the branch line protection device. The setting value includes the setting current and the tripping duration.

[0047] An adjustment module is used to remotely adjust the target protection device if it is determined that the setting value of the target protection device has changed compared to the set value.

[0048] Thirdly, the present invention also provides an electronic device, including a memory, a transceiver, and a processor;

[0049] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs in the memory and implementing the adaptive adjustment method for power distribution network protection as described in the first aspect above.

[0050] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for adaptive adjustment of distribution network protection as described in the first aspect above.

[0051] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for adaptive adjustment of distribution network protection as described in the first aspect.

[0052] The method and apparatus for adaptive adjustment of distribution network protection provided by this invention obtains equipment information on the lines where protection devices are located through real-time monitoring of distribution network equipment, classifies protection device levels according to the principle of capacity equalization, and automatically calculates the setting value of each protection device according to the setting value rules of protection devices on different lines. The protection devices with changing setting values ​​are adjusted through the distribution automation system, thereby realizing real-time protection of the distribution network, automatically completing adaptive setting, improving the accuracy of circuit protection, improving the effectiveness of distribution network protection management, reducing the burden of grassroots operation and maintenance, and continuously adapting to the needs of distribution network construction scale. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 This is a flowchart illustrating the adaptive adjustment method for distribution network protection provided in an embodiment of the present invention;

[0055] Figure 2 This is a schematic diagram of the structure of the adaptive adjustment device for distribution network protection provided in an embodiment of the present invention;

[0056] Figure 3 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0058] The adaptive adjustment method for distribution network protection proposed in this invention establishes real-time monitoring of changes in field equipment, automatically calculates and distributes the setting values ​​of protection devices, and realizes the full-process application of online automatic setting, configuration, verification and real-time access of protection settings. It promotes the full-process electronic mobile management of distribution network protection settings, ensures that the correct action rate of adaptive protection reaches more than 95%, empowers grassroots teams, effectively improves the work efficiency of grassroots distribution teams, enhances the effectiveness of distribution network protection management, reduces the burden of grassroots operation and maintenance, and continuously adapts to the needs of distribution network construction scale.

[0059] The following is based on Figures 1 to 3 This invention will be used to illustrate the method and apparatus for adaptive adjustment of power distribution network protection.

[0060] Figure 1 This is a flowchart illustrating the adaptive adjustment method for distribution network protection provided in an embodiment of the present invention. Figure 1 As shown, the method includes:

[0061] Step 101: Based on the distance from the substation, determine the tower numbers according to the main line and branch line respectively;

[0062] Specifically, current electrical wiring to households involves laying corresponding poles and towers from substations, supporting the corresponding cables, and transmitting the electricity output from the substations to each household. The deployment of these poles and towers is generally divided into main lines and branch lines. The main lines, branch lines, and substations together form a tree-like structure, with the substation acting as the root, the main lines as the trunk, and the branch lines as the branches. The main lines cover a wider area, while the branch lines cover a smaller area. For example, the main lines transmit the output electricity from the substation to various urban areas, while the branch lines transmit the electricity from a specific urban area to corresponding villages or communities. These main and branch line cables are primarily supported by the deployed poles and towers. In addition, transformers and protection devices can be installed on these poles and towers. However, not every pole and tower has a transformer and protection device installed; they are typically installed at intervals between poles and towers. The specific interval between poles and towers for installing transformers and protection devices depends on the transformer capacity or the power requirements of the connected electronic equipment. Based on their distance from the substation, the towers are first numbered according to the main line, and then according to the branch line. This allows us to determine whether the transformer or protection device installed on the tower belongs to the main line or the branch line, and whether it is far or near the substation, based on the tower number.

[0063] Step 102: Based on the tower number and the change information, redetermine the transformer capacity between any adjacent protection devices as the transformer capacity corresponding to the target protection device; all protection devices are located on the tower, and the target protection device is the protection device with the smaller tower number on which it is located; the change information includes equipment change information and line change information;

[0064] Specifically, within the entire distribution network, corresponding distribution network equipment may need replacement due to its service life requirements, or one or more new devices may be added, or one or more devices may be removed. Line changes, such as the addition, removal, or merging of lines, will also generate corresponding change information. By monitoring the distribution network equipment and lines in real time through a data center, this change information can be obtained instantly. Using this change information, along with the tower numbers, the specific line or corresponding distribution network equipment involved in the change can be identified, along with the nearby protection devices. The transformer capacity of all protection devices in the entire distribution network is then recalculated. The transformer capacity between any two adjacent protection devices is calculated and used as the transformer capacity of the protection device with the smaller tower number among these adjacent protection devices, i.e., the target protection device's transformer capacity. For example, if two adjacent protection devices are protection device A and protection device B, where the tower number of protection device A is smaller than that of protection device B, the transformer capacity corresponding to protection device A (the target protection device) is set to the sum of the transformer capacities between protection device A and protection device B. Following this method, the transformer capacity of all protection devices on the main and branch lines of the entire power grid is recalculated sequentially. The transformer capacity of the protection device furthest from the substation is determined based on the sum of the power of the electronic equipment connected to that protection device.

[0065] Step 103: Based on the principle of equal capacity allocation and the transformer capacity corresponding to the target protection device, determine the level corresponding to the target protection device;

[0066] After re-determining the transformer capacities of all protection devices in the entire distribution network, the protection devices are classified into levels according to the principle of equal capacity distribution. For example, they can be sorted by transformer capacity and the corresponding range for each level can be determined. If the transformer capacity of a certain protection device meets the corresponding range, then the level of that protection device is determined. Alternatively, levels can be divided according to main lines and branch lines, determining whether each protection device belongs to the level of a main line protection device or a branch line protection device. Main line protection devices closer to the substation are classified as Level 1. Main line protection devices can be divided into multiple levels, and the specific number of levels can be set according to actual needs; typically, there are a maximum of three levels for main line protection devices. Branch line protection devices closer to the main line outgoing point are classified as Level 1. Branch line protection devices can also be divided into multiple levels, and the specific number of levels can be set according to actual needs; typically, there are a maximum of three levels for branch line protection devices.

[0067] Step 104: Based on the level corresponding to the target protection device, and in conjunction with the setting rules of the main line protection device or the setting rules of the branch line protection device, determine the setting value of the target protection device. The setting value includes the setting current and the tripping duration.

[0068] Specifically, after determining the level of each protection device and the transformer capacity of each protection device according to the above rules, the setting value of the protection device is determined according to two setting rules.

[0069] If the protection device is located on the main line, the setting current and tripping duration of the protection device shall be determined according to the setting rules of the main line protection device.

[0070] If the protection device is located on a branch line, the setting current and tripping duration of the protection device shall be determined according to the setting rules of the branch line protection device.

[0071] By using setting rules corresponding to different lines, the setting current and tripping time of the protection device can be set more flexibly, and it is also easier to modify and operate in actual application.

[0072] Step 105: If it is determined that the setting value of the target protection device has changed compared with the set value, then the target protection device is remotely adjusted.

[0073] After determining the setting value for each protection device using the above method, the newly calculated setting value for each protection device is compared with its currently set setting value. If the calculated setting value differs from the currently set setting value, it is recorded, and the calculated setting value is transmitted to the distribution automation system via an interface. The distribution automation system then remotely adjusts or sets the protection device adaptively. After the adjustment or setting of the protection device whose setting value has changed is completed, the setting value information of the protection device in the data center is updated.

[0074] The adaptive adjustment method for distribution network protection provided by this invention obtains equipment information on the lines where protection devices are located through real-time monitoring of distribution network equipment, classifies protection device levels according to the principle of capacity equalization, and automatically calculates the setting value of each protection device according to the setting value rules of protection devices on different lines. The method then adjusts the protection devices with changing setting values ​​through the distribution automation system, thereby realizing real-time protection of the distribution network, automatically completing adaptive setting, improving the accuracy of circuit protection, enhancing the effectiveness of distribution network protection management, reducing the burden of grassroots operation and maintenance, and continuously adapting to the needs of distribution network construction scale.

[0075] Optionally, determining the level of the target protection device based on the capacity sharing principle and the transformer capacity corresponding to the target protection device includes:

[0076] Based on the tower number where the target protection device is located, determine whether the target protection device is located on the main line or the branch line;

[0077] If the target protection device is located on the main line, the main line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the main line level includes a maximum of three levels.

[0078] If the target protection device is located on a branch line, the branch line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the branch line level includes a maximum of three levels.

[0079] Specifically, since the poles are numbered based on their distance from the substation, according to the main line and branch line respectively, the location of the target protection device can be determined by the pole number it is on the main line or branch line. In addition, the distance between the target device and the substation can be determined by the size of the number.

[0080] After determining that the target protection device is located on the main line, the protection devices on the main line are classified according to the transformer capacity of the target protection device and the principle of equal capacity distribution. The ones closer to the substation are classified as Level 1. The number of protection device levels on the main line can be set according to the needs, usually up to three levels.

[0081] After determining that the target protection device is located on the branch line, the protection devices on the main line are classified according to the transformer capacity of the target protection device and the principle of equal capacity distribution. The protection devices closer to the main line outlet are classified as Level 1. The number of protection device levels on the branch line can be set according to the needs, usually up to three levels.

[0082] Optionally, determining the setting value of the target protection device based on the level corresponding to the target protection device, combined with the setting rules of the main line protection device or the setting rules of the branch line protection device, includes:

[0083] Determine whether the target protection device corresponds to the main line level or the branch line level.

[0084] If the target protection device corresponds to the main line level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation.

[0085] If the target protection device corresponds to a branch line level, then the setting value of the target protection device is determined based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device.

[0086] Specifically, after determining whether the target protection device corresponds to the main line level or the branch line level, the setting value of the target protection device needs to be determined in conjunction with the corresponding setting rules. For example, if the target protection device is determined to correspond to the main line level, the setting value of the target protection device is determined by combining the setting rules of the main line protection device and the setting value of the substation. Or, if the target protection device is determined to correspond to the branch line level, the setting value of the target protection device is determined based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device.

[0087] Optionally, if the target protection device corresponds to the main line protection level, the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation, including:

[0088] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0089] If the first trip duration is a first set value, then based on the first set value rule of the main line protection device in the set value rule of the main line protection device, and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined;

[0090] If the first trip duration is the second set value, then based on the main line second set value rule in the set value rule of the main line protection device and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined.

[0091] The first fixed value is greater than the second fixed value.

[0092] Specifically, the rated current and first trip duration of the substation are obtained; then, it is determined whether the first trip duration meets a first set value or a second set value, where the first set value is greater than the second set value. This allows for further determination of which sub-rule in the main line protection device setting rules should be applied. Based on the corresponding sub-rule, the setting value of the target protection device is determined, that is, the set current and trip duration of the target protection device. In this way, hierarchical management can be achieved according to different needs and the main line level of the protection devices, allowing for more flexible setting of the setting values ​​of all target protection devices.

[0093] Optionally, if the first tripping duration is a first set value, then based on the first set value rule of the main line in the set value rule of the main line protection device and the main line level of the target protection device, determining the set value current and tripping duration of the target protection device includes:

[0094] Determine the specific level of the main line protection system of the target protection device;

[0095] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the first multiple of the rated current, and the tripping time is the second tripping time;

[0096] If the target protection device belongs to the second level of the main line, then the set current of the target protection device is determined to be the second multiple of the rated current, and the tripping time is the third tripping time;

[0097] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the third multiple of the rated current, and the tripping time is the fourth tripping time.

[0098] The first multiple, the second multiple, and the third multiple decrease sequentially, and the first set value, the second trip duration, the third trip duration, and the fourth trip duration decrease sequentially.

[0099] Specifically, after obtaining the rated current P0 and the first trip duration A1 of the substation through the above method, and after the first trip duration A1 is the first set value, the main line level of the target protection device is determined, which may be main line level one, main line level two, or main line level three.

[0100] When the target protection device is the main line level, the set current of the target protection device is the first multiple of the rated current P1, and the tripping time is the second tripping time A2.

[0101] When the target protection device is the second level of the main line, the set current of the target protection device is the second multiple of the rated current P2, and the tripping time is the third tripping time A3.

[0102] When the target protection device is a main line level three device, the set current of the target protection device is the third multiple of the rated current P3, and the tripping time is the fourth tripping time A4.

[0103] In this context, 1>P1>P2≥P3>0, and A1>A2>A3>A4≥0. Typically, the value of A1 is less than 1. All tripping times are in seconds, and the unit for rated current or set current is amperes.

[0104] Optionally, if the first tripping duration is a second set value, then based on the mainline protection device's setting rules and the target protection device's mainline level, determining the target protection device's set current and tripping duration includes:

[0105] Determine the specific level of the main line protection system of the target protection device;

[0106] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the fourth multiple of the rated current, and the tripping time is the fifth tripping time.

[0107] If the target protection device belongs to the secondary level of the main line, then the set current of the target protection device is determined to be the fifth multiple of the rated current, and the tripping time is the sixth tripping time;

[0108] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the sixth multiple of the rated current, and the tripping time is the seventh tripping time;

[0109] The fourth, fifth, and sixth multiples decrease sequentially, as do the second set value, the fifth trip duration, the sixth trip duration, and the seventh trip duration.

[0110] Specifically, after obtaining the rated current P0 and the first trip duration A1' of the substation through the above method, and after the rated current A1' is the second set value, the main line level of the target protection device is determined, which may be main line level one, main line level two, or main line level three.

[0111] When the target protection device is the main line level, the set current of the target protection device is the fourth multiple of the rated current P4, and the trip duration is the fifth trip duration A5.

[0112] When the target protection device is the main line secondary, the set current of the target protection device is the fifth multiple of the rated current P5, and the trip duration is the sixth trip duration A6.

[0113] When the target protection device is a main line level three device, the set current of the target protection device is the sixth multiple of the rated current P6, and the tripping time is the seventh tripping time A7.

[0114] Among them, 1>P4>P5≥P6>0, A1>A1'>A5>A6>A7≥0. And usually the value of A1' is less than 1 second.

[0115] It is understood that the above is merely illustrative, and the three main line levels are not intended to limit the main line level division in this invention. The number of main line levels can be increased according to actual application needs, and the setting rules for the corresponding main line protection devices can also be adjusted according to the above method, all of which fall within the protection scope of this invention.

[0116] Optionally, if the target protection device corresponds to a branch line level, then based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device, the setting value of the target protection device is determined, including:

[0117] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0118] Determine the specific level of the branch protection device for the target;

[0119] If the target protection device is a branch line level one, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to the branch line level two.

[0120] If the first trip duration is a first fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is the trip duration of the first main line protection device minus the first preset value;

[0121] If the first trip duration is the second fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is zero.

[0122] The first mainline protection device is the protection device located on the mainline that exists between the substation and the target protection device.

[0123] Specifically, by obtaining the rated current and first trip duration of the substation through the above method, when the target protection device is located on a branch line, it is necessary to determine the protection devices adjacent to the target protection device on the same branch line, obtain the capacity of all transformers between the target protection device and the adjacent protection devices, and determine the set current corresponding to the capacity of all transformers between the target protection device and the adjacent protection devices based on the preset relationship between the transformer capacity and the set current, as the standard current.

[0124] The preset relationship between transformer capacity and set current can be expressed as:

[0125] Transformer capacity (kVA): Rated current (A) = Z; where Z is a positive number, and according to relevant data statistics, the optimal value is 17.32. Of course, this value may need to be adjusted depending on changes in environment or application conditions; it is not fixed. However, once set, all subsequent calculations are based on this set value.

[0126] For example, if the capacity of all transformers between the target protection device and adjacent protection devices determined by the above method is M, then the corresponding set current, which is the standard current, is M / Z.

[0127] Determine the specific level of the branch protection device of the target protection device, which may be branch level one, branch level two, branch level three, etc. Also, identify the main line protection device between the substation and the target protection device, i.e., the first main line protection device, and obtain the tripping duration A8 of this first main line protection device.

[0128] Next, the first trip duration of the substation is determined to be either a first set value or a second set value, wherein the first set value is greater than the second set value.

[0129] When the first trip duration of the substation is the first set value, and the target protection device is a branch line level one, the set value current of the target protection device is determined to be the seventh multiple of the standard current P7. The trip duration of the target protection device is A8 minus the first preset value, which is less than the first set value. P7 is a positive integer and can be configured as 3, 4, or 5, with a default value of 3.

[0130] When the first trip duration of the substation is the second set value, and the target protection device is a branch line level one, the set value current of the target protection device is determined to be the seventh multiple of the standard current P7, and the trip duration of the target protection device is zero.

[0131] Furthermore, if the first mainline protection device is not present, the tripping duration of the target protection device is half of the first tripping duration.

[0132] The setting values ​​for the main line and each branch line can also be configured according to the site conditions.

[0133] Similarly, if the target protection device is a secondary branch line protection device, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to the tertiary branch line protection devices.

[0134] When the first trip duration of the substation is the first set value, and the target protection device is a secondary branch line, the set value current of the target protection device is determined to be the seventh multiple of the standard current P7, the trip duration of the target protection device is zero, and the first preset value is less than the first set value.

[0135] When the first trip duration of the substation is the second set value, and the target protection device is a secondary branch line, the set current of the target protection device is determined to be the seventh multiple of the standard current P7, and the trip duration of the target protection device is zero.

[0136] Furthermore, if there are no other protection devices between the substation and the branch line, the tripping time of the target protection device is one-quarter of the first set value.

[0137] Similarly, if the target protection device is a branch line level three, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to branch line level three or branch line level four.

[0138] When the first trip duration of the substation is the first set value and the target protection device is a secondary branch line, the set current of the target protection device is determined to be the seventh multiple of the standard current P7, and the trip duration of the target protection device is zero.

[0139] When the first trip duration of the substation is the second set value, and the target protection device is a secondary branch line, the set value current of the target protection device is determined to be the seventh multiple of the standard current P7, and the trip duration of the target protection device is zero.

[0140] The adaptive adjustment method for distribution network protection provided by this invention obtains equipment information on the lines where protection devices are located through real-time monitoring of distribution network equipment, classifies protection device levels according to the principle of capacity equalization, and automatically calculates the setting value of each protection device according to the setting value rules of protection devices on different lines. The method then adjusts the protection devices with changing setting values ​​through the distribution automation system, thereby realizing real-time protection of the distribution network, automatically completing adaptive setting, improving the accuracy of circuit protection, enhancing the effectiveness of distribution network protection management, reducing the burden of grassroots operation and maintenance, and continuously adapting to the needs of distribution network construction scale.

[0141] The following specific examples illustrate the adaptive adjustment method for distribution network protection provided by this invention.

[0142] (1) Real-time monitoring of changes in the information of equipment and lines in the distribution network of the platform, including changes such as adding equipment, reducing equipment, updating equipment, adding, reducing or merging lines, etc.

[0143] (2) The poles and towers of the line where the equipment is located are sorted according to the main line and the branch line.

[0144] (3) Calculate the transformer capacity between the protection device and the next protection device by the relationship between the tower and the protection device, and between the tower and the transformer.

[0145] (4) Based on the transformer capacity under the protection device, the protection devices on the main line are classified according to the principle of distributing the capacity as evenly as possible. The protection devices closer to the substation are classified as Level 1, and the protection devices on the main line are classified as Level 3 at most.

[0146] (5) Based on the transformer capacity under the protection device, the protection devices on the branch line are classified according to the principle of distributing the capacity as evenly as possible. The protection device closest to the main line outlet is the first level, and the protection device on the branch line is at most the third level.

[0147] (6) The setting value of the protection device is automatically calculated according to the level of the protection device and the setting rules of the main line protection device or the setting rules of the branch line protection device.

[0148] First, determine the tripping duration and rated current of the substation; when the protection device is located on the main line, calculate the setting value of the protection device according to the setting rules of the main line protection device.

[0149] Among them, the setting rules for the main line protection device are as follows:

[0150] When the tripping time of the protection devices in the substation is 0.5s, the set current of the primary protection device of the main line is 0.8 times the rated current of the substation, and the tripping interval is 0.3s; the set current of the secondary protection device of the main line is 0.6 times the rated current of the substation, and the tripping interval is 0.15s; the set current of the tertiary protection device of the main line is 0.6 times the rated current of the substation, and the tripping interval is 0s.

[0151] When the tripping time of the protection devices in the substation is 0.3s, the set current of the primary protection device of the main line is 0.8 times the rated current of the substation, and the tripping interval is 0.15s; the set current of the secondary protection device of the main line is 0.6 times the rated current of the substation, and the tripping interval is 0s; the set current of the tertiary protection device of the main line is 0.6 times the rated current of the substation, and the tripping interval is 0s.

[0152] When the protection device is located on a branch line, the setting value of the protection device shall be calculated in accordance with the setting rules of the branch line protection device.

[0153] Among them, the setting rules for branch line protection devices are as follows:

[0154] When the tripping time of the protection device in the substation is 0.5s, the set current of the branch line primary protection device is k times the set current corresponding to the capacity of all distribution transformers between the two adjacent protection devices of the branch line primary and secondary protection devices, and the tripping interval is the tripping time of the corresponding protection device of the main line minus 0.15s (if there are no other protection devices between the substation and the branch line, the tripping interval of the branch line primary protection device is set to 0.25s); the set current of the branch line secondary protection device is k times the set current corresponding to the capacity of all distribution transformers between the two adjacent protection devices of the branch line secondary and tertiary protection devices, and the tripping interval is 0s (if there are no other protection devices between the substation and the branch line, the tripping interval of the branch line secondary protection device is set to 0.125s); the set current of the branch line tertiary protection device is k times the set current corresponding to the capacity of all distribution transformers between the two adjacent protection devices of the branch line tertiary and tertiary protection devices, and the tripping interval is 0s.

[0155] When the tripping time of the protection device in the substation is 0.3s, the set current of the branch line primary protection device is k times the set current corresponding to the capacity of all distribution transformers between the two adjacent protection devices of the branch line primary and secondary protection devices, and the tripping interval is 0s (if there are no other protection devices between the substation and the branch line, the tripping interval of the branch line primary protection device is set to 0.15s); the set current of the branch line secondary protection device is k times the set current corresponding to the capacity of all distribution transformers between the two adjacent protection devices of the branch line secondary and tertiary protection devices, and the tripping interval is 0s (if there are no other protection devices between the substation and the branch line, the tripping interval of the branch line secondary protection device is set to 0.075s); the set current of the branch line tertiary protection device is k times the set current corresponding to the capacity of all distribution transformers between the two adjacent protection devices of the branch line tertiary and tertiary protection devices, and the tripping interval is 0s.

[0156] Here, 'k' is a configurable item with values ​​of 3, 4, and 5, and a default value of 3. Customers can configure the values ​​for the main line and each branch line according to the site conditions.

[0157] (7) Compare the calculated set values ​​of each protection device with the set values ​​that have been set in the current equipment.

[0158] (8) Record the protection devices whose current setting value is inconsistent with the previous setting value, and transmit the protection device setting value information to the power distribution automation system through the interface.

[0159] (9) The power distribution automation system performs adaptive setting of the protection device remotely.

[0160] (10) After the on-site protection device is set, update the setting value information of the protection device in the data center.

[0161] Figure 2 This is a schematic diagram of the structure of the adaptive adjustment device for distribution network protection provided in an embodiment of the present invention. Figure 2 As shown, the device includes:

[0162] Numbering module 201 is used to determine the numbering of towers based on their distance from the substation, separately for main lines and branch lines;

[0163] The capacity module 202 is used to redetermine the transformer capacity between any two adjacent protection devices based on the tower number and the change information, and use this as the transformer capacity corresponding to the target protection device; the protection devices are all located on the towers, and the target protection device is the protection device with the smaller number on the tower it is located on; the change information includes equipment change information and line change information;

[0164] The rating module 203 is used to determine the rating of the target protection device based on the capacity sharing principle and the transformer capacity corresponding to the target protection device.

[0165] The setting value module 204 is used to determine the setting value of the target protection device based on the level corresponding to the target protection device and in combination with the setting value rules of the main line protection device or the setting value rules of the branch line protection device. The setting value of the target protection device includes the setting current and the tripping duration.

[0166] The adjustment module 205 is used to remotely adjust the target protection device if it is determined that the setting value of the target protection device has changed compared with the set value.

[0167] Optionally, in the process of determining the level corresponding to the target protection device based on the capacity sharing principle and the transformer capacity corresponding to the target protection device, the level module 203 is specifically used for:

[0168] Based on the tower number where the target protection device is located, determine whether the target protection device is located on the main line or the branch line;

[0169] If the target protection device is located on the main line, the main line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the main line level includes a maximum of three levels.

[0170] If the target protection device is located on a branch line, the branch line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the branch line level includes a maximum of three levels.

[0171] Optionally, the setting value module 204, in determining the setting value of the target protection device based on the level corresponding to the target protection device and in conjunction with the setting rules of the main line protection device or the branch line protection device, is specifically used for:

[0172] Determine whether the target protection device corresponds to the main line level or the branch line level.

[0173] If the target protection device corresponds to the main line level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation.

[0174] If the target protection device corresponds to a branch line level, then the setting value of the target protection device is determined based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device.

[0175] Optionally, in the process of determining the setting value of the target protection device based on the setting rules of the main line protection device and the setting value of the substation, if the level corresponding to the target protection device is the main line level, the setting value module 204 is specifically used for:

[0176] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0177] If the first trip duration is a first set value, then based on the first set value rule of the main line protection device in the set value rule of the main line protection device, and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined;

[0178] If the first trip duration is the second set value, then based on the main line second set value rule in the set value rule of the main line protection device and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined.

[0179] The first fixed value is greater than the second fixed value.

[0180] Optionally, when the setting value module 204 determines the setting current and trip duration of the target protection device based on the main line first setting rule in the setting rules of the main line protection device and the main line level of the target protection device, the setting value module 204 is specifically used for:

[0181] Determine the specific level of the main line protection system of the target protection device;

[0182] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the first multiple of the rated current, and the tripping time is the second tripping time;

[0183] If the target protection device belongs to the second level of the main line, then the set current of the target protection device is determined to be the second multiple of the rated current, and the tripping time is the third tripping time;

[0184] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the third multiple of the rated current, and the tripping time is the fourth tripping time.

[0185] The first multiple, the second multiple, and the third multiple decrease sequentially, and the first set value, the second trip duration, the third trip duration, and the fourth trip duration decrease sequentially.

[0186] Optionally, when the setting value module 204 determines that the first tripping duration is a second setting value, based on the mainline second setting rule in the setting rule of the mainline protection device and the mainline level of the target protection device, in the process of determining the setting current and tripping duration of the target protection device, it is specifically used for:

[0187] Determine the specific level of the main line protection system of the target protection device;

[0188] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the fourth multiple of the rated current, and the tripping time is the fifth tripping time.

[0189] If the target protection device belongs to the secondary level of the main line, then the set current of the target protection device is determined to be the fifth multiple of the rated current, and the tripping time is the sixth tripping time;

[0190] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the sixth multiple of the rated current, and the tripping time is the seventh tripping time;

[0191] The fourth, fifth, and sixth multiples decrease sequentially, as do the second set value, the fifth trip duration, the sixth trip duration, and the seventh trip duration.

[0192] Optionally, when the setting value module 204 determines that the target protection device corresponds to a branch line level, based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device, in the process of determining the setting value of the target protection device, it is specifically used for:

[0193] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0194] Determine the specific level of the branch protection device for the target;

[0195] If the target protection device is a branch line level one, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to the branch line level two.

[0196] If the first trip duration is a first fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is the trip duration of the first main line protection device minus the first preset value;

[0197] If the first trip duration is the second fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is zero.

[0198] The first mainline protection device is the protection device located on the mainline that exists between the substation and the target protection device.

[0199] Specifically, the adaptive adjustment device for distribution network protection provided by the present invention can realize all the method steps implemented in the above method embodiments and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail.

[0200] Figure 3 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as... Figure 3 As shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340, wherein the processor 310, the communication interface 320, and the memory 330 communicate with each other via the communication bus 340. The processor 310 can call logic instructions in the memory 330 to execute a method for adaptive adjustment of distribution network protection, the method including:

[0201] Based on the distance from the substation, the tower numbers are determined separately for the main line and branch line;

[0202] Based on the tower number and the change information, the transformer capacity between any adjacent protection devices is re-determined as the transformer capacity corresponding to the target protection device; all protection devices are located on the towers, and the target protection device is the protection device with the smaller tower number on which it is located; the change information includes equipment change information and line change information;

[0203] Based on the principle of equal capacity allocation and the transformer capacity corresponding to the target protection device, the level corresponding to the target protection device is determined;

[0204] Based on the level corresponding to the target protection device, and in conjunction with the setting rules of the main line protection device or the setting rules of the branch line protection device, the setting value of the target protection device is determined. The setting value of the target protection device includes the setting current and the tripping duration.

[0205] If it is determined that the setting value of the target protection device has changed compared to the set value, the target protection device is remotely adjusted.

[0206] Optionally, determining the level of the target protection device based on the capacity sharing principle and the transformer capacity corresponding to the target protection device includes:

[0207] Based on the tower number where the target protection device is located, determine whether the target protection device is located on the main line or the branch line;

[0208] If the target protection device is located on the main line, the main line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the main line level includes a maximum of three levels.

[0209] If the target protection device is located on a branch line, the branch line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the branch line level includes a maximum of three levels.

[0210] Optionally, determining the setting value of the target protection device based on the level corresponding to the target protection device, combined with the setting rules of the main line protection device or the setting rules of the branch line protection device, includes:

[0211] Determine whether the target protection device corresponds to the main line level or the branch line level.

[0212] If the target protection device corresponds to the main line level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation.

[0213] If the target protection device corresponds to a branch line level, then the setting value of the target protection device is determined based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device.

[0214] Optionally, if the target protection device corresponds to the main line protection level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation, including:

[0215] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0216] If the first trip duration is a first set value, then based on the first set value rule of the main line protection device in the set value rule of the main line protection device, and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined;

[0217] If the first trip duration is the second set value, then based on the main line second set value rule in the set value rule of the main line protection device and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined.

[0218] The first fixed value is greater than the second fixed value.

[0219] Optionally, if the first tripping duration is a first set value, then based on the first set value rule of the main line in the set value rule of the main line protection device and the main line level of the target protection device, determining the set value current and tripping duration of the target protection device includes:

[0220] Determine the specific level of the main line protection system of the target protection device;

[0221] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the first multiple of the rated current, and the tripping time is the second tripping time;

[0222] If the target protection device belongs to the second level of the main line, then the set current of the target protection device is determined to be the second multiple of the rated current, and the tripping time is the third tripping time;

[0223] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the third multiple of the rated current, and the tripping time is the fourth tripping time.

[0224] The first multiple, the second multiple, and the third multiple decrease sequentially, and the first set value, the second trip duration, the third trip duration, and the fourth trip duration decrease sequentially.

[0225] Optionally, if the first tripping duration is a second set value, then based on the mainline protection device's setting rules and the target protection device's mainline level, determining the target protection device's set current and tripping duration includes:

[0226] Determine the specific level of the main line protection system of the target protection device;

[0227] If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the fourth multiple of the rated current, and the tripping time is the fifth tripping time.

[0228] If the target protection device belongs to the secondary level of the main line, then the set current of the target protection device is determined to be the fifth multiple of the rated current, and the tripping time is the sixth tripping time;

[0229] If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the sixth multiple of the rated current, and the tripping time is the seventh tripping time;

[0230] The fourth, fifth, and sixth multiples decrease sequentially, as do the second set value, the fifth trip duration, the sixth trip duration, and the seventh trip duration.

[0231] Optionally, if the target protection device corresponds to a branch line level, then based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device, the setting value of the target protection device is determined, including:

[0232] Obtain the setting value of the substation, which includes the rated current and the first trip duration;

[0233] Determine the specific level of the branch protection device for the target;

[0234] If the target protection device is a branch line level one, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to the branch line level two.

[0235] If the first trip duration is a first fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is the trip duration of the first main line protection device minus the first preset value;

[0236] If the first trip duration is the second fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is zero.

[0237] The first mainline protection device is the protection device located on the mainline that exists between the substation and the target protection device.

[0238] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0239] It should be noted that the electronic device provided by the present invention can implement all the method steps implemented in the above method embodiments and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiments will not be described in detail here.

[0240] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the adaptive adjustment method for power distribution network protection provided in the above embodiments.

[0241] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for adaptive adjustment of distribution network protection provided in the above embodiments.

[0242] The processor-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical memory (e.g., CD, DVD, BD, HVD), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)).

[0243] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0244] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0245] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adaptive adjustment of distribution network protection, characterized in that, include: Based on the distance from the substation, the tower numbers are determined separately for the main line and branch line; Based on the tower number and the change information, the transformer capacity between any two adjacent protection devices is re-determined as the transformer capacity corresponding to the target protection device; all protection devices are located on the towers, and the target protection device is the protection device with the smaller tower number among the adjacent protection devices; the change information includes equipment change information and line change information; Based on the principle of equal capacity allocation and the transformer capacity corresponding to the target protection device, the level corresponding to the target protection device is determined; Based on the level corresponding to the target protection device, and in conjunction with the setting rules of the main line protection device or the setting rules of the branch line protection device, the setting value of the target protection device is determined. The setting value of the target protection device includes the setting current and the tripping duration. If it is determined that the setting value of the target protection device has changed compared to the set value, then the target protection device is remotely adjusted. The determination of the protection level corresponding to the target protection device based on the principle of capacity equalization and the transformer capacity corresponding to the target protection device includes: Based on the tower number where the target protection device is located, determine whether the target protection device is located on the main line or the branch line; If the target protection device is located on the main line, the main line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the main line level includes a maximum of three levels. If the target protection device is located on a branch line, the branch line level corresponding to the target protection device is determined based on the transformer capacity corresponding to the target protection device and according to the principle of equal capacity allocation; the branch line level includes a maximum of three levels. The determination of the setting value of the target protection device based on the level corresponding to the target protection device, combined with the setting rules of the main line protection device or the setting rules of the branch line protection device, includes: Determine whether the target protection device corresponds to the main line level or the branch line level. If the target protection device corresponds to the main line level, then the setting value of the target protection device is determined based on the setting rules of the main line protection device and the setting value of the substation. If the target protection device corresponds to a branch line level, then the setting value of the target protection device is determined based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device.

2. The method for adaptive adjustment of distribution network protection according to claim 1, characterized in that, If the target protection device corresponds to the main line protection level, then based on the setting rules of the main line protection device and the setting values ​​of the substation, the setting value of the target protection device is determined, including: Obtain the setting value of the substation, which includes the rated current and the first trip duration; If the first trip duration is a first set value, then based on the first set value rule of the main line protection device in the set value rule of the main line protection device, and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined; If the first trip duration is the second set value, then based on the main line second set value rule in the set value rule of the main line protection device and the main line level of the target protection device, the set value current and trip duration of the target protection device are determined. The first fixed value is greater than the second fixed value.

3. The method for adaptive adjustment of distribution network protection according to claim 2, characterized in that, If the first tripping duration is a first set value, then based on the first set value rule of the main line protection device in the set value rule of the main line protection device, and the main line level of the target protection device, the set value current and tripping duration of the target protection device are determined, including: Determine the specific level of the main line protection system of the target protection device; If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the first multiple of the rated current, and the tripping time is the second tripping time; If the target protection device belongs to the second level of the main line, then the set current of the target protection device is determined to be the second multiple of the rated current, and the tripping time is the third tripping time; If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the third multiple of the rated current, and the tripping time is the fourth tripping time. The first multiple, the second multiple, and the third multiple decrease sequentially, and the first set value, the second trip duration, the third trip duration, and the fourth trip duration decrease sequentially.

4. The method for adaptive adjustment of distribution network protection according to claim 2, characterized in that, If the first tripping duration is a second set value, then based on the mainline protection device's setting rules (second mainline setting rule) and the target protection device's mainline level, the set current and tripping duration of the target protection device are determined, including: Determine the specific level of the main line protection system of the target protection device; If the target protection device belongs to the main line level, then the set current of the target protection device is determined to be the fourth multiple of the rated current, and the tripping time is the fifth tripping time. If the target protection device belongs to the second level of the main line, then the set current of the target protection device is determined to be the fifth multiple of the rated current, and the tripping time is the sixth tripping time; If the target protection device belongs to the third level of the main line, then the set current of the target protection device is determined to be the sixth multiple of the rated current, and the tripping time is the seventh tripping time; The fourth, fifth, and sixth multiples decrease sequentially, as do the second set value, the fifth trip duration, the sixth trip duration, and the seventh trip duration.

5. The method for adaptive adjustment of distribution network protection according to claim 1, characterized in that, If the target protection device corresponds to a branch line level, then based on the setting rules of the branch line protection device and the transformer capacity corresponding to the target protection device, the setting value of the target protection device is determined, including: Obtain the setting value of the substation, which includes the rated current and the first trip duration; Determine the specific level of the branch protection device for the target; If the target protection device is a branch line level one, then the set current corresponding to the capacity of all transformers between adjacent protection devices located on the same branch line as the target protection device is determined as the standard current; the adjacent protection devices are the protection devices belonging to the branch line level two. If the first trip duration is a first fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is the trip duration of the first main line protection device minus the first preset value; If the first trip duration is the second fixed value, then the set current of the target protection device is determined to be the seventh multiple of the standard current, and the trip duration of the target protection device is zero. The first mainline protection device is the protection device located on the mainline that exists between the substation and the target protection device.

6. An apparatus for adaptive adjustment of distribution network protection using the method for adaptive adjustment of distribution network protection as described in any one of claims 1 to 5, characterized in that, The device includes: The numbering module is used to determine the numbering of towers based on their distance from the substation, separately for main lines and branch lines; The capacity module is used to redetermine the transformer capacity between any two adjacent protection devices based on the tower number and the change information, and use this as the transformer capacity corresponding to the target protection device; all protection devices are located on the towers, and the target protection device is the protection device with the smaller tower number among the adjacent protection devices; the change information includes equipment change information and line change information; The rating module is used to determine the rating of the target protection device based on the principle of capacity equalization and the transformer capacity corresponding to the target protection device. The setting value module is used to determine the setting value of the target protection device based on the level corresponding to the target protection device and in combination with the setting rules of the main line protection device or the setting rules of the branch line protection device. The setting value of the target protection device includes the setting current and the tripping duration. An adjustment module is used to remotely adjust the target protection device if it is determined that the setting value of the target protection device has changed compared to the set value.

7. An electronic device employing the adaptive adjustment method for distribution network protection as described in any one of claims 1 to 5, characterized in that, Includes memory, transceiver, and processor; A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: Based on the distance from the substation, the tower numbers are determined separately for the main line and branch line; Based on the tower number and the change information, the transformer capacity between any two adjacent protection devices is re-determined as the transformer capacity corresponding to the target protection device; all protection devices are located on the towers, and the target protection device is the protection device with the smaller tower number among the adjacent protection devices; the change information includes equipment change information and line change information; Based on the principle of equal capacity allocation and the transformer capacity corresponding to the target protection device, the level corresponding to the target protection device is determined; Based on the level corresponding to the target protection device, and in conjunction with the setting rules of the main line protection device or the setting rules of the branch line protection device, the setting value of the target protection device is determined. The setting value of the target protection device includes the setting current and the tripping duration. If it is determined that the setting value of the target protection device has changed compared to the set value, the target protection device is remotely adjusted.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for causing a computer to perform the method for adaptive adjustment of distribution network protection as described in any one of claims 1 to 5.

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