Load transfer method and device for feeder line of power distribution network, storage medium and program product
By prioritizing the transfer of distributed generation loads and combining this with the load transfer method based on the carrying capacity of the feeder of the opposite distribution network, the problem of insufficient self-healing capability of the distribution network was solved, and the stability of power supply and rapid recovery of distributed generation were achieved.
Patent Information
- Application Number
- CN202511657099.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-02-10
AI Technical Summary
In existing technologies, the self-healing capability of distribution network feeders is low when they are faulty, which cannot guarantee power supply. Especially in distribution networks with a high proportion of distributed power sources, traditional methods of calculating the transfer capacity may lead to heavy overload of the feeder at the other end, posing a risk to the power grid.
By prioritizing the transfer of the grid-connected load required for the feeder branch of the distributed power source to be connected to the grid, and combining the carrying capacity of the feeder of the opposite distribution network, the branch switch is precisely controlled to transfer the load to the feeder of the opposite distribution network, ensuring that the distributed power source and the opposite distribution network jointly bear the load of the feeder of the faulty grid.
It enhances the self-healing capability of the distribution network, ensures the stability of power supply, reduces the risk of overload on the feeders of the opposite distribution network, and enables the smooth transfer of loads and the rapid recovery of distributed power sources.
Smart Images
Figure CN121507701A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power distribution network technology, and in particular to a load transfer method, device, storage medium and program product for power distribution network feeders. Background Technology
[0002] With the development of power technology, a large number of distributed power sources and users have been connected to the distribution network, making the structure of the distribution network increasingly complex. When a distribution network feeder fails, the loads connected to that feeder will lose power supply, affecting normal production and daily life. Therefore, timely transfer of loads on the distribution network feeder when a fault occurs to ensure stable power supply for users is a key aspect of distribution network maintenance.
[0003] In related technologies, based on the load of the sectionalizing switches in the fault-side distribution network feeder, a combination of sectionalizing switches capable of carrying the load of the sectionalizing switches in the opposite feeder is determined, and the load transfer of the fault-side distribution network feeder is achieved by connecting the sectionalizing switch combination in the opposite feeder. However, this method suffers from low self-healing capability of the distribution network, making it impossible to guarantee the power supply to the distribution network feeders. Summary of the Invention
[0004] This application provides a load transfer method, device, storage medium, and program product for distribution network feeders, which can enhance the self-healing capability of the distribution network and ensure the power supply of the distribution network feeders.
[0005] In a first aspect, embodiments of this application provide a load transfer method for a distribution network feeder, wherein the distribution network feeder is connected to a distributed power source, including:
[0006] In response to a fault in a distribution network feeder, determine the grid-connected load required to restore the grid connection of the feeder branch where the distributed generation is located;
[0007] Determine the load to be transferred based on the grid-connected load;
[0008] The load to be transferred is transferred to the feeder of the distribution network on the other side, which is a feeder that has a connection relationship with the undervoltage section of the distribution network feeder.
[0009] In one possible implementation, determining the load to be transferred based on the grid-connected load includes:
[0010] Obtain the first load margin of the feeder in the opposite distribution network;
[0011] Based on the difference between the first load margin and the grid-connected load, determine the user load that the opposite distribution network feeder can carry;
[0012] From the feeder branches included in the non-faulty section of the distribution network feeder, identify the target feeder branch whose load is less than the user load that the opposite distribution network feeder can carry;
[0013] From the target feeder branch, determine the first branch to be transferred;
[0014] The sum of the load of the first branch line to be transferred and the grid-connected load is determined as the load to be transferred.
[0015] In one possible implementation, determining the first branch to be transferred from the target feeder branch includes:
[0016] The branch combination with the highest load among the target feeder branches is identified as the first branch to be transferred.
[0017] In one possible implementation, the branch is divided into important branch and ordinary branch, and the first branch to be transferred is determined from the target feeder branch, including:
[0018] Determine whether there are any important branches in the target feeder branch. If so, identify the important branches in the target feeder branch as the first branch to be transferred.
[0019] In one possible implementation, it also includes:
[0020] Monitor whether distributed power sources have resumed grid connection;
[0021] In response to the detection that the distributed power source has resumed grid connection, the load of the feeder branch connected to the distributed power source will be transferred to the distributed power source.
[0022] Obtain the second load margin of the opposite distribution network feeder;
[0023] Based on the second load margin, determine the second branch to be transferred from the feeder branches that have not been transferred from the load.
[0024] The load of the second branch line to be transferred is transferred to the feeder of the distribution network on the opposite side.
[0025] In one possible implementation, the target load margin includes either the first load margin or the second load margin, and the target load margin of the opposite distribution network feeder is determined in the following manner:
[0026] Obtain the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network;
[0027] The minimum value of the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network is determined as the target load margin of the feeder of the opposite distribution network.
[0028] In one possible implementation, obtaining the load margin corresponding to any sectionalizing switch in the opposite distribution network feeder includes:
[0029] For any sectionalizing switch in the feeder of the opposite distribution network, obtain the rated load and actual load of the sectionalizing switch;
[0030] The product of the rated load and the preset heavy load ratio is the heavy load.
[0031] The difference between the heavy load and the actual load is determined as the load margin corresponding to the sectionalizing switch.
[0032] Secondly, embodiments of this application provide a load transfer device for a distribution network feeder, wherein the distribution network feeder is connected to a distributed power source, including:
[0033] The first determining module is used to determine the grid-connected load required to restore the grid connection of the feeder branch where the distributed power source is located in response to a fault in the distribution network feeder;
[0034] The second determining module is used to determine the load to be transferred based on the grid-connected load;
[0035] The transfer module is used to transfer the load to be transferred to the feeder of the distribution network on the opposite side. The feeder of the distribution network on the opposite side is a feeder that has a connection relationship with the undervoltage section of the distribution network feeder.
[0036] Thirdly, embodiments of this application provide a load transfer device for a distribution network feeder, including: a memory and a processor;
[0037] The memory stores the instructions that the computer executes;
[0038] The processor executes computer execution instructions stored in memory, causing the processor to perform the methods described in the various possible implementations of the first aspect above.
[0039] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed, are used to implement the methods described in the various possible implementations of the first aspect above.
[0040] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed, implements the methods described in the various possible implementations of the first aspect above.
[0041] The load transfer method, device, storage medium, and program product for distribution network feeders provided in this application, in response to a fault in a distribution network feeder, determine the grid-connected load required to restore the grid connection of the feeder branch where the distributed power source is located; determine the load to be transferred based on the grid-connected load; and transfer the load to be transferred to the opposite distribution network feeder, which is a feeder connected to the undervoltage section of the distribution network feeder. By transferring the grid-connected load required to restore the grid connection of the feeder branch where the distributed power source is located, the distributed power source can restore grid connection as soon as possible, take over the load of the faulty distribution network feeder, and enable more user loads to be transferred to the opposite distribution network feeder, restoring user power consumption, thereby improving the self-healing capability of the distribution network and ensuring the power supply of the distribution network feeders. Attached Figure Description
[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0043] Figure 1 This is a schematic diagram of a load transfer scenario for a distribution network feeder provided in an embodiment of this application;
[0044] Figure 2 Schematic flowchart of the load transfer method for distribution network feeders provided in the embodiments of this application Figure 1 ;
[0045] Figure 3 Schematic flowchart of the load transfer method for distribution network feeders provided in the embodiments of this application Figure 2 ;
[0046] Figure 4 This is a schematic diagram of the structure of the load transfer device for the distribution network feeder provided in the embodiments of this application;
[0047] Figure 5 This is a schematic diagram of the load transfer device for the power distribution network feeder provided in the embodiments of this application.
[0048] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0049] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0050] The self-healing function of a distribution network refers to monitoring the operating status of distribution network feeders, promptly detecting feeder faults, diagnosing and isolating faulty sections, and automatically restoring power to non-faulty sections via feeders on the opposite end of the loop. This self-healing capability enables real-time monitoring of the distribution network status, rapid fault location, automatic isolation, and power restoration, reducing outage time and scope, and improving power supply reliability. Simultaneously, it reduces manual maintenance costs, improves grid operating efficiency, adapts to the development needs of smart grids, ensures power quality for users, and enhances the grid's ability to cope with various complex situations.
[0051] In related technologies, before power transfer, the distribution network self-healing function calculates the remaining capacity of the feeder at the other end and the load of the non-faulty section of the faulty feeder. Only when the calculated remaining capacity of the feeder at the other end can handle the load of the non-faulty section of the faulty feeder will the distribution network self-healing function initiate a tie switch closing strategy, allowing the feeder at the other end to transfer power to the non-faulty section of the faulty feeder. If the calculated remaining capacity of the feeder at the other end can handle the load of the non-faulty section of the faulty feeder, the distribution network self-healing function will not initiate a tie switch closing strategy, ensuring that the feeder at the other end does not experience line overload during power transfer. The load of the non-faulty section is collected by the sectionalizing switches on the distribution network feeder. Therefore, when there are many loads to be transferred, the distribution network's self-healing capability is poor, and a stable power supply to the distribution network feeders cannot be guaranteed.
[0052] Furthermore, the above method for calculating the transfer capacity is applicable in distribution networks with single-end power supply from substations because the load data collected by the feeders in a single-end power supply distribution network is the full load data. However, this method is not applicable in distribution networks with a high proportion of distributed generation, because the distribution network is supplied by distributed generation, and the load data collected by the sectional switches on the distribution network feeders is the remaining load data after subtracting the generation power of the distributed generation. Currently, most distributed generation in distribution networks is grid-connected. When a fault occurs in a distribution network feeder, the substation will first disconnect the power to the faulty feeder. The grid-connected distributed generation will stop generating electricity when it detects the loss of voltage in the distribution network feeder. The actual load in the non-faulty section of the faulty feeder is greater than the load data collected by the automatic switch of the faulty feeder before the fault. If the original method for calculating the transfer capacity is still used, it may cause the feeder at the other end to be heavily overloaded, resulting in grid risks.
[0053] The load transfer method for distribution network feeders provided in this application prioritizes transferring the grid-connected load required for the feeder branch where the distributed power source is located to restore grid connection. This results in less load pressure on the feeder of the opposite distribution network, ensuring smooth load transfer and enabling the distributed power source to restore grid connection as quickly as possible. This allows the distributed power source to bear the load, and the distributed power source and the feeder of the opposite distribution network jointly bear the load of the faulty feeder, effectively improving the self-healing ability of the distribution network and ensuring the power supply of the distribution network feeders.
[0054] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0055] Figure 1 This is a schematic diagram illustrating a load transfer scenario for a distribution network feeder provided in an embodiment of this application. Figure 1 As shown, the tie switch LB connects distribution network feeder A and distribution network feeder B. CB1 is the in-station switch for line A. K1, K2, and K3 are the off-station sectionalizing switches for line A. K7, K8, K9, and K10 are branch switches connected to line A, which are connected to feeder branches, and these feeder branches are connected to branch lines. K7 is connected to a branch line that is not only connected to a branch line but also to a distributed generation (DG). For example, the DG can be a distributed photovoltaic (PV) power source, a distributed wind power source, a small hydropower source, or a biomass power source, etc. The DG is connected to the feeder branch line of line A through the distributed generation grid connection point switch K11. CB2 is the in-station switch for line B. K4, K5, and K6 are the off-station sectionalizing switches for line B. A DG is connected to line A. If a fault occurs between K1 and K2, the feeder segment between K1 and K2 needs to be isolated, and the loads of K2 and K3 need to be transferred.
[0056] Figure 2 Schematic flowchart of the load transfer method for distribution network feeders provided in the embodiments of this application Figure 1 .like Figure 2 As shown, the load transfer method for distribution network feeders provided in this application embodiment is applied to, for example, Figure 1 The distribution network feeder shown is connected to distributed generation sources, and the load transfer methods for the distribution network feeder include:
[0057] S201. In response to a fault in the distribution network feeder, determine the grid-connected load required to restore the grid connection of the feeder branch where the distributed power source is located.
[0058] like Figure 1As shown, a distribution network feeder can be divided into multiple feeder segments, and the load of each feeder segment can be collected through sectionalizing switches. In one embodiment, the load of the feeder segment is represented by the actual power of the sectionalizing switches. Specifically, the actual power values of the switches and sectionalizing switches on the distribution network feeder are collected and recorded at preset time intervals. The actual power of sectionalizing switch K1 is a1, the actual power of sectionalizing switch K2 is a2, the actual power of sectionalizing switch K3 is a3, the actual power of sectionalizing switch K4 is a4, the actual power of sectionalizing switch K5 is a5, the actual power of sectionalizing switch K6 is a6, the actual power of branch switch K7 is a7, the actual power of branch switch K8 is a8, the actual power of branch switch K9 is a9, the actual power of branch switch K10 is a10, the actual power of station switches CB1 is a11, and the actual power of CB2 is a12.
[0059] Optionally, the load of the feeder section of the distribution network feeder can be collected through generator meters, smart measurement terminals, etc.
[0060] When a fault is detected in a distribution network feeder, the nearest sectionalizing switches before and after the fault point are disconnected, isolating the fault. The sectionalizing switch furthest from the local substation at the fault isolation point is selected, and the latest recorded active power value of the load before the fault disconnection is read. Simultaneously, the latest active power values of all distributed power generation grid-connected switches after the sectionalizing switch at the fault isolation point furthest from the local substation are read.
[0061] Assuming the fault point occurs in, for example Figure 1 If the load is between K1 and K2, then K1 and K2 are disconnected. Loads on feeder branches containing distributed generation sources within the non-faulty sections of the distribution network feeder are considered as grid-connected loads.
[0062] When a feeder branch includes distributed generation, there are two power supply directions: when the power generation of the distributed generation is greater than the power generation required by the feeder branch, the feeder branch supplies power to the distribution network; when the power generation of the distributed generation is less than the power generation required by the feeder branch, the distribution network supplies power to the feeder branch.
[0063] The calculation of grid-connected load, that is, the load of the feeder branch where the distributed power source is located, is related to the direction of power supply. For example, such as... Figure 1 As shown, the power supply direction can be determined based on the data collected by K7. When the power supply direction is from the feeder branch to the distribution network, the grid-connected load is equal to the absolute value of the actual power of the distributed generation grid connection point switch K11 minus the absolute value of the actual power of the branch switch K7. When the power supply direction is from the distribution network to the grid feeder branch, the grid-connected load is equal to the sum of the absolute values of the actual power of the branch switch K7 and the absolute values of the actual power of the distributed generation grid connection point switch K11.
[0064] S202. Determine the load to be transferred based on the grid-connected load.
[0065] Based on the grid-connected load, and considering the carrying capacity of the feeder on the opposite side of the grid, the grid-connected load and some user loads are identified as loads to be transferred by precisely controlling the branch switches. This achieves the goal of restoring the power supply of the branch lines to the greatest extent possible while ensuring the priority restoration of grid connection of the feeder branches where the distributed power source is located.
[0066] Specifically, the user load is connected to the main line of the distribution network feeder through a branch switch. When the branch switch is closed, the user load corresponding to the branch switch is identified as the user load to be transferred. By closing the tie switch, the load to be transferred to the distribution network feeder on the other side.
[0067] S203. Transfer the load to be transferred to the feeder of the distribution network on the opposite side. The feeder of the distribution network on the opposite side is a feeder that has a connection relationship with the undervoltage section of the distribution network feeder.
[0068] like Figure 1 As shown, closing the tie switch LB transfers the grid-connected load and some user loads to the distribution network feeder B, thus realizing the partial load transfer of the distribution network feeder A.
[0069] The load transfer method for distribution network feeders provided in this application prioritizes transferring the grid-connected load required for the feeder branch where the distributed power source is located to restore grid connection. This results in less load pressure on the feeder of the opposite distribution network, ensuring smooth load transfer and enabling the distributed power source to restore grid connection as quickly as possible. This allows the distributed power source to bear the load, and the distributed power source and the feeder of the opposite distribution network jointly bear the load of the faulty feeder. The grid-connected load effectively improves the self-healing ability of the distribution network and ensures the power supply of the distribution network feeders.
[0070] Figure 3 Schematic flowchart of the load transfer method for distribution network feeders provided in the embodiments of this application Figure 2 .like Figure 3 As shown, in one possible implementation, determining the load to be transferred based on the grid-connected load includes:
[0071] S301. Obtain the first load margin of the opposite distribution network feeder.
[0072] Specifically, the first load margin of the opposite side distribution network feeder represents the amount of load that the opposite side distribution network feeder can withstand from the faulty side distribution network feeder, provided that it can guarantee its own load supply.
[0073] In some implementations, the determination of the first load margin should fully consider the load-carrying capacity of each sectionalizing switch in the feeder of the opposite distribution network, to avoid overload tripping of the sectionalizing switches due to excessive load transfer. When the transferred load exceeds the load margin of any sectionalizing switch in the feeder of the opposite distribution network, it will cause an overload fault in the sectionalizing switch of the feeder of the opposite distribution network. Therefore, the load margin of the feeder of the opposite distribution network is the minimum value among the load margins corresponding to any sectionalizing switch in the feeder of the opposite distribution network. For example, such as... Figure 1 As shown, the feeder B of the opposite distribution network includes sectionalizing switches K4, K5 and K6. The load margins of sectionalizing switches K4, K5 and K6 are determined respectively, and the minimum load margin among them is determined as the first load margin of the feeder of the opposite distribution network.
[0074] S302. Based on the difference between the first load margin and the grid-connected load, determine the user load that the opposite distribution network feeder can carry.
[0075] In this embodiment, priority is given to transferring grid-connected loads. Therefore, while ensuring that grid-connected loads can be successfully transferred, the carrying capacity of the distribution network feeder on the other side is considered, and some user loads are transferred.
[0076] S303. From the feeder branches included in the non-faulty section of the distribution network feeder, identify the target feeder branch whose load is less than the user load that the opposite distribution network feeder can carry.
[0077] It is understandable that transferring a load greater than the capacity of the opposite distribution network feeder to the faulty side will lead to an overload fault on the opposite feeder. Therefore, identifying a target feeder branch with a load less than the capacity of the opposite distribution network feeder within the faulty side feeder, and selecting load transfer targets from this target feeder branch, can reduce the possibility of overload on the opposite distribution network feeder.
[0078] S304. Determine the first branch to be transferred from the target feeder branch.
[0079] In one implementation, the feeder branch whose load is closest to that that the opposite distribution network can carry is identified as the first feeder branch to be transferred, or the combination of feeder branches whose total load is closest to that that the opposite distribution network can carry is identified as the first feeder branch to be transferred.
[0080] In another implementation, the first branch line to be transferred should include important users, such as hospitals and schools. On the basis of ensuring the power supply of important branches, the branch line combination whose total load is closest to the user load that the opposite distribution network can bear is determined as the first branch line to be transferred.
[0081] S305. Determine the sum of the load of the first branch line to be transferred and the grid-connected load as the load to be transferred.
[0082] The load transfer method for distribution network feeders provided in this application prioritizes grid-connected loads and restores grid connection of feeder branches where distributed power sources are located. It also considers the carrying capacity of the opposite distribution network feeder and identifies some user loads and grid-connected loads as loads to be transferred. While reducing the risk of overload on the opposite distribution network feeder, it transfers the load of the faulty distribution network feeder as much as possible to ensure the power supply of the distribution network.
[0083] In one possible implementation, determining the first branch to be transferred from the target feeder branches includes: determining the combination of branches with the largest load among the target feeder branches as the first branch to be transferred.
[0084] Among them, the target feeder branch is the feeder branch whose load is less than the user load that the distribution network on the other side can carry. Combining the branch with the largest load among the target feeder branches into the first branch to be transferred can reduce the risk of overloading the feeder of the distribution network on the other side and restore the power supply of the faulty feeder to the greatest extent.
[0085] The load transfer method for distribution network feeders provided in this application determines the combination of branches with the largest load among the target feeder branches as the first branch to be transferred, thereby reducing the risk of overloading the distribution network feeder on the opposite side.
[0086] In one possible implementation, the branch is divided into important branch and ordinary branch, and the first branch to be transferred is determined from the target feeder branch, including:
[0087] Determine whether there are any important branches in the target feeder branch. If so, identify the important branches in the target feeder branch as the first branch to be transferred.
[0088] Specifically, tags are predefined for branches, categorized into important branches and ordinary branches. Before determining which branch to transfer, the tags are checked, prioritizing branches tagged as important. Branches containing important users are designated as important branches, while branches without important users are designated as ordinary branches. For example, branches containing users such as schools and hospitals are defined as important branches, while other branches are defined as ordinary branches.
[0089] Optionally, the branch can be subdivided into multiple levels, and the first branch to be transferred can be determined based on the branch level.
[0090] Understandably, in order to transfer the load to the greatest extent possible and restore power supply to the faulty feeder, if there is still a load margin in the distribution network feeder on the other side, the load of ordinary feeders should be transferred as much as possible based on the load margin, while ensuring the power supply to important branch lines.
[0091] The load transfer method for distribution network feeders provided in this application classifies branch lines and prioritizes the transfer of loads from important branch lines during load transfer, thereby ensuring the power supply to important infrastructure in the distribution network.
[0092] In one possible implementation, it also includes:
[0093] Monitor whether the distributed generation has resumed grid connection; in response to the detection that the distributed generation has resumed grid connection, transfer the load of the feeder branch connected to the distributed generation to the distributed generation; obtain the second load margin of the feeder of the opposite distribution network; based on the second load margin, determine the second branch to be transferred from the feeder branch that has not been transferred; transfer the load of the second branch to be transferred to the feeder of the opposite distribution network.
[0094] After the distributed generation (DG) resumes grid connection, its normal operation allows it to take over the load on the feeder branches connected to it. This may cause the load that was originally transferred to the feeder branches of the opposite distribution network to be handled by the DG again. Therefore, the load on the feeder branches of the opposite distribution network decreases, increasing the load margin. The load on the opposite distribution network is then re-detected to obtain a new load margin value, known as the second load margin. Based on this second load margin, feeder branches or combinations of feeder branches with loads less than the load margin are identified from the feeder branches that were not transferred. These are designated as the second feeder branches to be transferred, and their loads are then transferred to the feeder branches of the opposite distribution network.
[0095] The load transfer method for distribution network feeders provided in this application promptly transfers the load to the distributed power source after the distributed power source is restored to grid connection, and re-acquires the load margin of the opposite distribution network feeder. Based on the second load margin, the load of the remaining untransferred feeder branches is transferred to the opposite distribution network feeder to ensure the power supply of the distribution network.
[0096] In one possible implementation, the target load margin includes either the first load margin or the second load margin, and the target load margin of the opposite distribution network feeder is determined in the following manner:
[0097] Obtain the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network; determine the minimum value among the load margins corresponding to any sectionalizing switch in the feeder of the opposite distribution network as the target load margin of the feeder of the opposite distribution network.
[0098] When the transferred load exceeds the load margin of any sectionalizing switch in the opposite distribution network feeder, it will cause an overload fault in the sectionalizing switch of the opposite distribution network feeder. Therefore, the load margin of the opposite distribution network feeder is the minimum value among the load margins corresponding to any sectionalizing switch in the opposite distribution network feeder. For example, Figure 1As shown, the feeder B of the opposite distribution network includes sectionalizing switches K4, K5, and K6. Determine the load margin of sectionalizing switches K4, K5, and K6 respectively, and determine the minimum load margin among them as the load margin of the feeder of the opposite distribution network.
[0099] The load transfer method for distribution network feeders provided in this application fully considers the carrying capacity of each sectionalizing switch in the opposite distribution network feeder when determining the load margin of the opposite distribution network feeder. It determines the minimum value of the load margin corresponding to any sectionalizing switch in the opposite distribution network feeder as the load margin of the opposite distribution network feeder, ensuring that the transferred load does not exceed the load margin of the sectionalizing switches in the opposite distribution network feeder, and reducing the possibility of overload faults in the sectionalizing switches.
[0100] In one possible implementation, obtaining the load margin corresponding to any sectionalizing switch in the opposite distribution network feeder includes:
[0101] For any sectionalizing switch in the feeder of the opposite distribution network, obtain the rated load and actual load of the sectionalizing switch;
[0102] The product of the rated load and the preset heavy load ratio is the heavy load.
[0103] The difference between the heavy load and the actual load is determined as the load margin corresponding to the sectionalizing switch.
[0104] For example, the overload ratio is 80%, such as Figure 1 As shown, the feeder B of the opposite distribution network includes sectionalizing switches K4, K5, and K6. The actual power of sectionalizing switch K4 is a4, and its rated power is b4. Therefore, the load margin of sectionalizing switch K4 is c4 = b4 * 80% - a4. Similarly, the actual power of sectionalizing switch K5 is a5, and its rated power is b5. Therefore, the load margin of sectionalizing switch K5 is c5 = b5 * 80% - a5. The actual power of sectionalizing switch K6 is a6, and its rated power is b6. Therefore, the load margin of sectionalizing switch K6 is c6 = b6 * 80% - a6. The feeder B of the opposite distribution network includes the substation switch CB2. Assuming the actual power of substation switch CB2 is a12, and its rated power is b12, then the load margin of substation switch CB2 is c12 = b12 * 80% - a12. The minimum value among c4, c5, c6, and c12 is the load margin of the feeder of the opposite distribution network.
[0105] The load transfer method for distribution network feeders provided in this application sets a heavy load ratio when calculating the load margin corresponding to the sectionalizing switch, determines the heavy load value based on the heavy load ratio, and uses the difference between the heavy load value and the actual load as the load margin corresponding to the sectionalizing switch. This reduces the possibility of the transferred load causing heavy load on the opposite side of the distribution network feeder, and further reduces the risk of faults in the opposite side of the distribution network feeder.
[0106] Figure 4 This is a schematic diagram of the load transfer device for a distribution network feeder provided in an embodiment of this application. Figure 4 As shown, the distribution network feeder is connected to distributed power sources. The load transfer device 40 for the distribution network feeder provided in this embodiment includes:
[0107] The first determining module 401 is used to determine the grid-connected load required to restore the grid connection of the feeder branch where the distributed power source is located in response to a fault in the distribution network feeder.
[0108] The second determining module 402 is used to determine the load to be transferred based on the grid-connected load;
[0109] The transfer module 403 is used to transfer the load to be transferred to the feeder of the distribution network on the opposite side. The feeder of the distribution network on the opposite side is a feeder that has a connection relationship with the undervoltage section of the distribution network feeder.
[0110] In one possible implementation, the second determining module 402 is specifically used for:
[0111] Obtain the first load margin of the feeder in the opposite distribution network;
[0112] The user load that the opposite distribution network can carry is determined based on the difference between the first load margin and the grid-connected load.
[0113] From the branches included in the non-faulty section of the distribution network feeder, identify the target feeder branch whose load is less than the user load that the opposite distribution network can carry;
[0114] From the target feeder branch, determine the first branch to be transferred;
[0115] The sum of the load of the first branch line to be transferred and the grid-connected load is determined as the load to be transferred.
[0116] In one possible implementation, the second determining module 402 is specifically used for:
[0117] The branch combination with the highest load among the target feeder branches is identified as the first branch to be transferred.
[0118] In one possible implementation, branches are divided into important branches and ordinary branches, and the second determining module 402 is specifically used for:
[0119] Determine if there are any important users in the target feeder branch. If so, identify the important branch in the target feeder branch as the first branch to be transferred.
[0120] In one possible implementation, the transfer module 403 is further configured to:
[0121] Monitor whether distributed power sources have resumed grid connection;
[0122] In response to the detection that the distributed power source has resumed grid connection, the load of the branch line connected to the distributed power source will be transferred to the distributed power source.
[0123] Obtain the second load margin of the opposite distribution network feeder;
[0124] Based on the second load margin, determine the second branch to be transferred from the branches that have not been transferred from the load.
[0125] The load of the second branch line to be transferred is transferred to the feeder of the distribution network on the opposite side.
[0126] In one possible implementation, the target load margin includes either the first load margin or the second load margin, and the target load margin of the opposite distribution network feeder is determined in the following manner:
[0127] Obtain the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network;
[0128] The minimum value of the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network is determined as the target load margin of the feeder of the opposite distribution network.
[0129] In one possible implementation, obtaining the load margin corresponding to any sectionalizing switch in the opposite distribution network feeder includes:
[0130] For any sectionalizing switch in the feeder of the opposite distribution network, obtain the rated load and actual load of the sectionalizing switch;
[0131] The product of the rated load and the preset heavy load ratio is the heavy load.
[0132] The difference between the heavy load and the actual load is determined as the load margin corresponding to the sectionalizing switch.
[0133] The load transfer device for the distribution network feeder provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.
[0134] Figure 5 This is a schematic diagram of the load transfer device for a distribution network feeder provided in an embodiment of this application. Figure 5 As shown, the load transfer device 50 for a power distribution network feeder provided in this embodiment includes at least one processor 501 and a memory 502. Optionally, the load transfer device 50 for the power distribution network feeder further includes a communication interface 503. The processor 501, memory 502, and communication interface 503 are connected via a communication bus 504.
[0135] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.
[0136] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.
[0137] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.
[0138] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.
[0139] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.
[0140] This application also provides a computer program product, including a computer program that, when executed, implements the above-described method.
[0141] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed, implement the above-described method.
[0142] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.
[0143] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an application-specific integrated circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.
[0144] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.
[0145] 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 units can be selected to achieve the purpose of this embodiment according to actual needs.
[0146] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0147] If a function is implemented as 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 this 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 of the various embodiments of this 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.
[0148] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0149] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.
Claims
1. A load transfer method for a distribution network feeder, characterized in that, The distribution network feeder is connected to distributed power sources, including: In response to a fault in the distribution network feeder, determine the grid-connected load required to restore the grid connection of the feeder branch where the distributed power source is located; Based on the grid-connected load, determine the load to be transferred; The load to be transferred is transferred to the feeder of the distribution network on the opposite side, which is a feeder that has a connection relationship with the undervoltage section of the distribution network feeder.
2. The load transfer method for distribution network feeders according to claim 1, characterized in that, The step of determining the load to be transferred based on the grid-connected load includes: Obtain the first load margin of the feeder of the opposite distribution network; The user load that the opposite distribution network feeder can carry is determined based on the difference between the first load margin and the grid-connected load. From the feeder branches included in the non-faulty section of the distribution network feeder, identify the target feeder branch whose user load is less than the user load that the opposite distribution network feeder can carry; From the target feeder branches, determine the first branch to be transferred; The sum of the load of the first branch line to be transferred and the grid-connected load is determined as the load to be transferred.
3. The load transfer method for distribution network feeders according to claim 2, characterized in that, The step of determining the first branch to be transferred from the target feeder branch includes: The branch combination with the highest load among the target feeder branches is identified as the first branch to be transferred.
4. The load transfer method for distribution network feeders according to claim 2, characterized in that, Branch lines are divided into important branch lines and ordinary branch lines. The step of determining the first branch line to be transferred from the target feeder branch lines includes: Determine whether there is an important branch in the target feeder branch. If so, determine the important branch in the target feeder branch as the first branch to be transferred.
5. The load transfer method for a distribution network feeder according to any one of claims 1 to 4, characterized in that, Also includes: Monitor whether the distributed power source has been restored to grid connection; In response to the detection that the distributed power source has resumed grid connection, the load of the feeder branch connected to the distributed power source is transferred to the distributed power source; Obtain the second load margin of the opposite distribution network feeder; Based on the second load margin, determine the second branch to be transferred from the feeder branches that have not been transferred from the load; The load of the second branch to be transferred is transferred to the feeder of the distribution network on the opposite side.
6. The load transfer method for a distribution network feeder according to any one of claims 2 to 4, characterized in that, The target load margin includes either the first load margin or the second load margin, and the target load margin of the opposite distribution network feeder is obtained in the following way: Obtain the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network; The minimum value of the load margin corresponding to any sectionalizing switch in the opposite distribution network feeder is determined as the target load margin of the opposite distribution network feeder.
7. The load transfer method for distribution network feeders according to claim 6, characterized in that, The step of obtaining the load margin corresponding to any sectionalizing switch in the feeder of the opposite distribution network includes: For any sectionalizing switch in the opposite distribution network feeder, obtain the rated load and actual load of the sectionalizing switch; The product of the rated load and the preset heavy load ratio is determined as the heavy load. The difference between the heavy load and the actual load is determined as the load margin corresponding to the sectionalizing switch.
8. A load transfer device for a distribution network feeder, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-7.
9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed, are used to implement the method as described in any one of claims 1-7.
10. A computer program product, characterized in that, Includes a computer program, which, when executed, implements the method according to any one of claims 1-7.