Power supply switching method, device and electronic equipment for distribution network

Abstract

The present application discloses a power supply switching method, device and electronic equipment for a distribution network, and relates to the technical field of distribution network and the technical field of wireless communication. The method includes: in the event of a fault in the line between the first switch and the second switch in the distribution network, the load current value of the second switch is sent to L contact switches; the power supply arranged on the second side of each contact switch is used as the target power supply; the load current value of the first switch connected to the target power supply is sent to the contact switch belonging to the same current branch as the target power supply; according to the load current value of the second switch received by each contact switch and the load current value of the first switch, a target contact switch is determined from the L contact switches to perform a closing operation. The present application solves the technical problem that the prior art cannot reasonably determine the contact switch that needs to be closed when a fault occurs in the distribution network, resulting in unreasonable power supply switching and the risk of line overload.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution network and the technical field of wireless communication, and in particular to a power supply switching method, device and electronic equipment of a power distribution network. Background Art

[0002] The distribution network is an important part of the power system, and its operating status directly affects the stability and reliability of the power system. However, the distribution network often encounters various faults during operation, such as short circuits and grounding, which may cause the distribution network to be paralyzed, thereby affecting the normal power consumption of users. Therefore, how to quickly and accurately locate and isolate faults, and how to quickly restore power supply to non-fault areas after fault isolation, are urgent issues to be solved in the operation and management of distribution networks. Intelligent distributed feeder automation is an emerging distribution network fault handling technology that realizes real-time monitoring and fault handling of the distribution network by installing a large number of intelligent devices in the distribution network. The intelligent distributed feeder automation system can automatically locate, isolate and repair faults, thereby improving the operating efficiency and reliability of the distribution network.

[0003] Although the existing intelligent distributed technology of distribution network has improved the operation efficiency and reliability of distribution network to a certain extent, and can realize fault self-healing, however, since the distribution network self-healing process usually randomly selects a power supply for power supply switching, there may be overload during the self-healing of the distribution network, resulting in the risk of line overload after self-healing.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The present application provides a power supply switching method, device and electronic equipment for a distribution network, so as to at least solve the technical problem in the prior art that it is impossible to reasonably determine the connecting switch that needs to be closed when a fault occurs in the distribution network, resulting in unreasonable power supply switching and the risk of line overload.

[0006] According to one aspect of the present application, a power supply switching method for a distribution network is provided, which is applied to the distribution network, wherein the distribution network includes L tie switches, and a power supply is respectively arranged on both sides of each tie switch, L is an integer greater than 1, wherein the power supply switching method for the distribution network includes: in the case of detecting that a line between a first switch and a second switch in the distribution network has a fault, sending a load current value of the second switch to the L tie switches, wherein the first switch and the second switch are located on a first side of the L tie switches, and the second switch is closer to the L tie switches than the first switch; using a power supply arranged on the second side of each tie switch as a target power supply, wherein the second side and the first side respectively represent two opposite sides of each tie switch; sending a load current value of a first switch connected to the target power supply to a tie switch belonging to the same current branch as the target power supply; and determining a target tie switch from the L tie switches to perform a closing operation according to the load current value of the second switch received by each tie switch and the load current value of the first switch, so as to switch the power supply of the second switch to the target power supply arranged on the second side of the target tie switch.

[0007] Optionally, in the process of determining a target tie switch from L tie switches to perform a closing operation based on the load current value of the second switch and the load current value of the first switch received by each tie switch, the power supply switching method of the distribution network also includes: summing the load current value of the second switch and the load current value of the first switch received by the Ith tie switch to obtain a target load current value of the Ith tie switch; obtaining a maximum load current value of the first switch corresponding to the Ith tie switch, wherein the first switch corresponding to the Ith tie switch is the first switch of the target power supply of the Ith tie switch; when the target load current value is greater than or equal to the maximum load current value, it is prohibited to select the Ith tie switch as the target tie switch; when the target load current value is less than the maximum load current value, the Ith tie switch is used as an alternative switch.

[0008] Optionally, according to the load current value of the second switch and the load current value of the first switch received by each tie switch, a target tie switch is determined from L tie switches to perform a closing operation, including: when there are X alternative switches, a closing delay time of each alternative switch is obtained, wherein X is a positive integer less than or equal to L, and the closing delay time of each alternative switch represents a preparation time for the alternative switch to complete the closing operation; and according to the closing delay time of each alternative switch, a target tie switch is determined from the X alternative switches to perform a closing operation.

[0009] Optionally, determining a target contact switch from X candidate switches to perform a closing operation according to the closing delay time of each candidate switch includes: sorting the X candidate switches according to the closing delay time of each candidate switch to obtain a sorting result; and according to the sorting result, selecting the candidate switch with the shortest closing delay time as the target contact switch.

[0010] Optionally, determining a target tie switch from the L tie switches to perform a closing operation to switch the power supply of the second switch to a target power supply set on a second side of the target tie switch includes: detecting voltages across the target tie switch; and when it is detected that no voltage exists on a first side of the target tie switch and a voltage exists on a second side of the target tie switch, determining that the target tie switch performs a closing operation to switch the power supply of the second switch to the target power supply set on the second side of the target tie switch.

[0011] Optionally, after detecting the voltage across the target tie switch, the power supply switching method for the distribution network further includes: prohibiting the target tie switch from performing a closing operation when it is detected that voltage exists on both sides of the target tie switch, or when voltage exists on the first side of the target tie switch and no voltage exists on the second side of the target tie switch.

[0012] Optionally, the load current value of the first switch connected to the target power supply is sent to the connecting switch that belongs to the same current branch as the target power supply, including: using a target communication method to send the load current value of the first switch connected to the target power supply to the connecting switch that belongs to the same current branch as the target power supply, wherein the target communication method is used to transmit the load current value of the first switch between adjacent related switches in a closed state until the load current value of the first switch is sent to the connecting switch that belongs to the same current branch as the target power supply.

[0013] Optionally, after selecting the alternative switch with the shortest closing delay as the target connecting switch according to the sorting result, the power supply switching method of the distribution network also includes: when it is detected that the target connecting switch fails to perform the closing operation, selecting an alternative switch from all alternative switches except the target connecting switch according to the sorting result as the new target connecting switch to perform the closing operation.

[0014] According to another aspect of the present application, a power supply switching device for a distribution network is also provided, which is applied to the distribution network, wherein the distribution network includes L tie switches, and a power supply is respectively arranged on both sides of each tie switch, L is an integer greater than 1, wherein the power supply switching device for the distribution network includes: a first processing unit, which is used to send the load current value of the second switch to the L tie switches when a fault is detected in the line between the first switch and the second switch in the distribution network, wherein the first switch and the second switch are located on the first side of the L tie switches, and the second switch is closer to the L tie switches than the first switch; a second processing unit, which is used to use the power supply arranged on the second side of each tie switch as the target power supply, wherein the second side and the first side respectively represent the opposite sides of each tie switch; a third processing unit, which is used to send the load current value of the first switch connected to the target power supply to the tie switch belonging to the same current branch as the target power supply; according to the load current value of the second switch received by each tie switch and the load current value of the first switch, a target tie switch is determined from the L tie switches to perform a closing operation, so as to switch the power supply of the second switch to the target power supply arranged on the second side of the target tie switch.

[0015] According to another aspect of the present application, an electronic device is also provided, wherein the electronic device includes one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors execute any one of the above-mentioned power supply switching methods of the distribution network.

[0016] In the present application, when a fault is detected in a line between a first switch and a second switch in a distribution network, a load current value of the second switch is sent to L tie switches, wherein the first switch and the second switch are located on a first side of the L tie switches, and the second switch is closer to the L tie switches than the first switch; a power supply arranged on the second side of each tie switch is used as a target power supply, wherein the second side and the first side respectively represent two opposite sides of each tie switch; the load current value of the first switch connected to the target power supply is sent to a tie switch belonging to the same current branch as the target power supply; based on the load current value of the second switch received by each tie switch and the load current value of the first switch, a target tie switch is determined from the L tie switches to perform a closing operation to switch the power supply of the second switch to the target power supply arranged on the second side of the target tie switch.

[0017] It can be seen from the above content that, unlike the prior art, the present application does not randomly select a tie switch from L tie switches to perform a closing operation, thereby realizing the switching of the power supply, but determines a target tie switch from L tie switches to perform a closing operation according to the load current value of the second switch and the load current value of the first switch received by each tie switch. After each tie switch is closed, there is a direct connection between the total load current on the branch where the tie switch is located, the load current value of the second switch, and the load current value of the first switch received by the tie switch. Therefore, by adopting the solution of the present application, it is possible to effectively avoid selecting a tie switch that may cause line overload for closing operation, but to selectively select a tie switch that will not cause line overload as much as possible for closing operation.

[0018] It can be seen that through the technical solution of the present application, the purpose of flexibly selecting the interconnecting switch for closing operation is achieved while ensuring that the line will not be overloaded, thereby achieving the technical effect of improving the line stability when the distribution network switches the power supply, and further solving the technical problem that the prior art cannot reasonably determine the interconnecting switch that needs to be closed when a distribution network fails, resulting in unreasonable power supply switching and the risk of line overload. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 is a flow chart of an optional power supply switching method of a distribution network according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of an optional topology of a distribution network according to an embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of an optional power supply switching device of a distribution network according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] It should also be noted that the information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) collected by this application are information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data are in compliance with the relevant laws, regulations and standards of the relevant regions, necessary confidentiality measures are taken, and public order and good customs are not violated, and corresponding operation portals are provided for users to choose to authorize or refuse. For example, an interface is set up between this system and relevant users or institutions. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or institution through the interface, and obtain relevant information after receiving the consent information fed back by the aforementioned user or institution.

[0026] According to an embodiment of the present application, an embodiment of a power supply switching method for a distribution network is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0027] Optionally, the power supply switching method of the distribution network in the embodiment of the present application can be applied to a distribution network, wherein the distribution network includes L connecting switches, and a power supply is arranged on both sides of each connecting switch, and L is an integer greater than 1.

[0028] In an optional embodiment, a distribution network management system (also referred to as an intelligent distributed feeder automation system) can be used as the execution subject of the power supply switching method of the distribution network in the embodiment of the present application, wherein the distribution network management system can be a software system or an embedded system combining software and hardware. In addition, it can be understood by those skilled in the art that, in addition to using the above-mentioned distribution network management system as the execution subject, the execution subject of the power supply switching method of the distribution network in the present application can also be other devices or equipment, and the embodiment of the present application does not specifically limit this. For the convenience of description, the distribution network management system is used as the execution subject below.

[0029] Optionally, Figure 1 is a flow chart of an optional power supply switching method of a distribution network according to an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0030] Step S101: When a fault is detected in a line between a first switch and a second switch in a distribution network, a load current value of the second switch is sent to L tie switches.

[0031] In step S101 , the first switch and the second switch are located at a first side of L tie switches, and the second switch is closer to the L tie switches than the first switch.

[0032] Optionally, Figure 2 is a schematic diagram of an optional topology of a distribution network according to an embodiment of the present application, such as Figure 2 As shown, when a fault occurs at point K1 in the distribution network, the distribution network management system starts immediately, quickly determines the fault location through the built-in fault detection and location algorithm, and issues instructions to trip the trunk switches B2 and B3 to complete the fault isolation. Among them, switch B2 corresponds to the first switch mentioned above, and switch B3 corresponds to the second switch mentioned above. Figure 2 In the figure, A1, A3 and A2 are all power sources, and B6 and B11 are two connecting switches. The power sources on both sides of the connecting switch B6 are A1 and A2 respectively; the power sources on both sides of the connecting switch B11 are A1 and A3 respectively.

[0033] Optionally, after switches B2 and B3 are tripped and fault isolation is completed, the distribution network management system sends the last detected load current value of switch B3 to tie switch B6 and tie switch B11 respectively.

[0034] Step S102: taking the power source provided on the second side of each tie switch as the target power source.

[0035] In step S102 , the second side and the first side represent two opposite sides of each tie switch respectively.

[0036] Optionally, in Figure 2 In the embodiment, the left side of the tie switch can be used as the first side of the tie switch, and the right side of the tie switch can be used as the second side of the tie switch. The target power source corresponding to the tie switch B6 is the power source A2, and the target power source corresponding to the tie switch B11 is the power source A3.

[0037] Step S103: sending the load current value of the first switch connected to the target power source to the tie switch belonging to the same current branch as the target power source.

[0038] Optionally, in Figure 2 In the example, switch B10 is the first switch connected to the target power source A2; switch B15 is the first switch connected to the target power source A3. After switches B3 and B2 are tripped and the fault isolation is completed, the first switch B10 sends its own load current value to the tie switch B6; the first switch B15 sends its own load current value to the tie switch B11.

[0039] Step S104: According to the load current value of the second switch and the load current value of the first switch received by each tie switch, a target tie switch is determined from the L tie switches to perform a closing operation, so as to switch the power supply of the second switch to a target power supply set on the second side of the target tie switch.

[0040] Alternatively, if Figure 2 As shown, the tie switch B6 receives the load current value of the switch B3 and the load current value of the switch B10; the tie switch B11 receives the load current value of the switch B3 and the load current value of the switch B15. The distribution network management system will select a tie switch from the tie switch B6 and the tie switch B11 as the target tie switch to perform the closing operation according to the load current value received by each tie switch.

[0041] Optionally, after the target tie switch is successfully closed, the target power supply corresponding to the target tie switch is called the power supply of the second switch. Figure 2 In the example, assuming that the tie switch B11 is selected as the target tie switch, the power supply A3 will supply power to the switch B3.

[0042] It should be noted that in Figure 2In the example, if there is no fault at point K1, switches B1, B2, B3, B4, and B5 are all powered by power supply A; switches B7, B8, B9, and B10 are powered by power supply A2; and switches B12, B13, B14, and B15 are powered by power supply A3. After a fault occurs at point K1, switches B2 and B3 trip and isolate the fault, so that switches B3, B4, and B5 lose power. On this basis, if the tie switch B6 is closed, power supply A2 will be used as the power supply for switches B3, B4, and B5; if the tie switch B11 is closed, power supply A3 will be used as the power supply for switches B3, B4, and B5.

[0043] Based on the contents of the above steps S101 to S104, it can be known that in the present application, when a fault is detected in the line between the first switch and the second switch in the distribution network, the load current value of the second switch is sent to L connecting switches, wherein the first switch and the second switch are located on the first side of the L connecting switches, and the second switch is closer to the L connecting switches than the first switch; the power supply arranged on the second side of each connecting switch is used as the target power supply, wherein the second side and the first side respectively represent the opposite sides of each connecting switch; the load current value of the first switch connected to the target power supply is sent to the connecting switch belonging to the same current branch as the target power supply; according to the load current value of the second switch received by each connecting switch and the load current value of the first switch, a target connecting switch is determined from the L connecting switches to perform a closing operation to switch the power supply of the second switch to the target power supply arranged on the second side of the target connecting switch.

[0044] It can be seen from the above content that, unlike the prior art, the present application does not randomly select a tie switch from L tie switches to perform a closing operation, thereby realizing the switching of the power supply, but determines a target tie switch from L tie switches to perform a closing operation according to the load current value of the second switch and the load current value of the first switch received by each tie switch. After each tie switch is closed, there is a direct connection between the total load current on the branch where the tie switch is located, the load current value of the second switch, and the load current value of the first switch received by the tie switch. Therefore, by adopting the solution of the present application, it is possible to effectively avoid selecting a tie switch that may cause line overload for closing operation, but to selectively select a tie switch that will not cause line overload as much as possible for closing operation.

[0045] It can be seen that through the technical solution of the present application, the purpose of flexibly selecting the interconnecting switch for closing operation is achieved while ensuring that the line will not be overloaded, thereby achieving the technical effect of improving the line stability when the distribution network switches the power supply, and further solving the technical problem that the prior art cannot reasonably determine the interconnecting switch that needs to be closed when a distribution network fails, resulting in unreasonable power supply switching and the risk of line overload.

[0046] In an optional embodiment, in the process of determining a target tie switch from L tie switches to perform a closing operation according to the load current value of the second switch and the load current value of the first switch received by each tie switch, the distribution network management system can sum the load current value of the second switch and the load current value of the first switch received by the Ith tie switch to obtain the target load current value of the Ith tie switch. In addition, the distribution network management system can also obtain the maximum load current value of the first switch corresponding to the Ith tie switch, wherein the first switch corresponding to the Ith tie switch is the first switch of the target power supply of the Ith tie switch. When the target load current value is greater than or equal to the maximum load current value, the distribution network management system prohibits the selection of the Ith tie switch as the target tie switch; when the target load current value is less than the maximum load current value, the distribution network management system uses the Ith tie switch as an alternative switch.

[0047] Alternatively, if Figure 2 As shown, assuming that the first tie switch is tie switch B6, the sum of the load current value of switch B3 and the load current value of switch B10 is calculated as the target load current value of tie switch B6. If the target load current value of tie switch B6 is greater than or equal to the maximum load current value (also called overload setting value) of switch B10, it is forbidden to select tie switch B6 as the target tie switch, because if tie switch B6 is closed, the branch where tie switch B6 is located may have a line overload problem. In addition, if the target load current value of tie switch B6 is less than the maximum load current value of switch B10, tie switch B6 is used as an alternative switch.

[0048] Similarly, assuming that the first tie switch is tie switch B11, the sum of the load current value of switch B3 and the load current value of switch B15 is calculated as the target load current value of tie switch B11. If the target load current value of tie switch B11 is greater than or equal to the maximum load current value (also called overload setting value) of switch B15, it is prohibited to select tie switch B11 as the target tie switch, because if tie switch B11 is closed, the branch where tie switch B11 is located may have a line overload problem. In addition, if the target load current value of tie switch B11 is less than the maximum load current value of switch B15, tie switch B11 is used as an alternative switch.

[0049] It can be seen from the above content that the technical solution of the present application can effectively avoid the problem of line overload that is likely to occur when switching power supplies.

[0050] In an optional embodiment, in the process of determining a target tie switch from L tie switches to perform a closing operation according to the load current value of the second switch and the load current value of the first switch received by each tie switch, if there are X candidate switches, the distribution network management system can obtain the closing delay time of each candidate switch, where X is a positive integer less than or equal to L, and the closing delay time of each candidate switch represents the preparation time for the candidate switch to complete the closing operation. Then, the distribution network management system determines a target tie switch from the X candidate switches to perform a closing operation according to the closing delay time of each candidate switch.

[0051] Optionally, each contact switch is pre-set with a closing delay time. In the embodiment of the present application, if there are multiple contact switches, the closing delay time is set between the multiple contact switches according to the preset interval time. For example, the preset interval time is set to 0.3 seconds, then the closing delay time of the first contact switch among the multiple contact switches is 0.3 seconds, the closing delay time of the second contact switch is 0.6 seconds, and the closing delay time of the third contact switch is 0.9 seconds, and so on. The overall setting logic follows the principle that the closing delay time of the j+1th contact switch is 0.3 seconds longer than the closing delay time of the jth contact switch. Wherein, j is a positive integer.

[0052] It should be noted that the preset interval duration may also be other values, and this application does not specifically limit this.

[0053] In an optional embodiment, the distribution network management system may sort the X candidate switches according to the closing delay time of each candidate switch to obtain a sorting result. Then, the distribution network management system may also select the candidate switch with the shortest closing delay time as the target tie switch according to the sorting result.

[0054] Optionally, when there are multiple alternative switches, the distribution network management system prioritizes the alternative switch with the shortest closing delay as the target contact switch to perform the closing operation, thereby restoring power supply to the switch at the breakpoint as soon as possible and improving the timeliness of the power supply self-healing rate of the distribution network.

[0055] In an optional embodiment, in the process of determining a target tie switch from the L tie switches to perform a closing operation to switch the power supply of the second switch to the target power supply set on the second side of the target tie switch, the distribution network management system may detect the voltage across the target tie switch, and when it is detected that there is no voltage on the first side of the target tie switch and there is a voltage on the second side of the target tie switch, the distribution network management system determines that the target tie switch performs a closing operation to switch the power supply of the second switch to the target power supply set on the second side of the target tie switch.

[0056] Optionally, when it is detected that voltage exists on both sides of the target tie switch, or voltage exists on a first side of the target tie switch and no voltage exists on a second side of the target tie switch, the distribution network management system prohibits the target tie switch from performing a closing operation.

[0057] Optionally, the target tie switch is allowed to perform the closing operation only when it is determined that the target tie switch is in a single-side voltage loss state (i.e., there is no voltage on the first side of the target tie switch, and there is voltage on the second side of the target tie switch), otherwise the target tie switch is not allowed to perform the closing operation. This design is to ensure the safe operation of the distribution network. If there is voltage on both sides of the target tie switch, closing the target tie switch at this time may easily lead to the risk of short circuit in the distribution network.

[0058] In an optional embodiment, the distribution network management system may use a target communication method to send the load current value of the first switch connected to the target power supply to the connecting switch belonging to the same current branch as the target power supply, wherein the target communication method is used to transmit the load current value of the first switch between adjacent related switches in a closed state until the load current value of the first switch is sent to the connecting switch belonging to the same current branch as the target power supply.

[0059] Optionally, during peer-to-peer communication, load prejudgment can be achieved as long as each tie switch can obtain the load current and load setting value of the power supply points on both sides of the switch. Specifically, in open-loop operation, any tie switch that meets the load transfer conditions (open position and pressure on both sides) has only one path on both sides of the switch connected to the power station, otherwise it is closed-loop operation.

[0060] Optionally, in the embodiment of the present application, the load prediction information transmission (forwarding) logic is designed as follows:

[0061] For the primary switch connected to the power supply, if it is in the closed position, the load current value and overload setting value of the primary switch are sent to the lower switch; if the primary switch is in the open position, the invalid load information is sent;

[0062] For the middle switch that is not the first switch, when the middle switch is closed, the effective load information received on the M side is forwarded to the N side, and the effective load information received on the N side is forwarded to the M side, so as to realize the step-by-step transmission of load prediction information; when the middle switch is open, the effective load information is not forwarded, and the invalid load information is sent directly.

[0063] For the tie switch, load prediction can be completed based on the effective load prediction information received on both sides of the tie switch.

[0064] In an optional embodiment, after selecting the alternative switch with the shortest closing delay as the target tie switch according to the sorting result, when it is detected that the target tie switch fails to perform the closing operation, the distribution network management system selects an alternative switch from all alternative switches except the target tie switch as the new target tie switch to perform the closing operation according to the sorting result.

[0065] Optionally, if it is detected that the target tie switch fails to perform the closing operation, the distribution network management system will select the candidate switch with the second shortest closing delay time among the X candidate switches as the new target tie switch to perform the closing operation. If the new target tie switch also fails to perform the closing operation, the candidate switch with the third shortest closing delay time among the X candidate switches will continue to be selected to perform the closing operation, and so on, until an alternative switch is selected to close successfully.

[0066] It can be seen from the above content that the technical solution of this application can at least achieve the following technical effects:

[0067] Quick response: The intelligent distributed feeder automation system can quickly locate, isolate and repair faults after a distribution network fault occurs, greatly improving the speed and efficiency of fault handling.

[0068] Automatic adjustment: The technical solution of the present application can predict whether the line will be overloaded after the power supply is transferred according to the load current value and the overload setting value before the fault. If the line will be overloaded, the load transfer is locked, thereby realizing automatic adjustment and avoiding the line overload problem caused by load transfer.

[0069] Flexible configuration: In the technical solution of the present application, any switch only has a GOOSE subscription relationship with the adjacent switch. The GOOSE subscription relationship is simple to configure. When the distribution network changes, only the adjacent switch configuration needs to be changed without modifying the terminal software, which improves the configuration flexibility and adaptability of the system.

[0070] High reliability: This application adopts a host-free design, and multiple interconnecting switches are independent of each other. When any interconnecting switch is abnormal, it will not affect the load prediction and transfer of other interconnecting switches, and the native reliability is high.

[0071] Simplified testing: In this technical solution, all trunk switch software logics and configuration principles are the same. System testing for complex grids can be done through local grid configuration testing without the need for global traversal testing, which greatly simplifies the difficulty and workload of testing.

[0072] According to another aspect of an embodiment of the present application, a power supply switching device for a distribution network is further provided, which is applied to a distribution network, wherein the distribution network includes L tie switches, and a power supply is respectively arranged on both sides of each tie switch, and L is an integer greater than 1, wherein, Figure 3 As shown, the power supply switching device of the power distribution network includes: a first processing unit 301 , a second processing unit 302 , a third processing unit 303 , and a fourth processing unit 304 .

[0073] Optionally, the first processing unit 301 is used to send the load current value of the second switch to L tie switches when a fault is detected in the line between the first switch and the second switch in the distribution network, wherein the first switch and the second switch are located on the first side of the L tie switches, and the second switch is closer to the L tie switches than the first switch; the second processing unit 302 is used to use the power supply arranged on the second side of each tie switch as the target power supply, wherein the second side and the first side respectively represent the two opposite sides of each tie switch; the third processing unit 303 is used to send the load current value of the first switch connected to the target power supply to the tie switch belonging to the same current branch as the target power supply; the fourth processing unit 304 is used to determine a target tie switch from the L tie switches to perform a closing operation based on the load current value of the second switch received by each tie switch and the load current value of the first switch, so as to switch the power supply of the second switch to the target power supply arranged on the second side of the target tie switch.

[0074] Optionally, the fourth processing unit 304 includes: a first processing subunit, a first acquisition subunit, a second processing subunit, and a third processing subunit. The first processing subunit is used to calculate the sum of the load current value of the second switch and the load current value of the first switch received by the Ith contact switch to obtain the target load current value of the Ith contact switch; the first acquisition subunit is used to obtain the maximum load current value of the first switch corresponding to the Ith contact switch, wherein the first switch corresponding to the Ith contact switch is the first switch of the target power supply of the Ith contact switch; the second processing subunit is used to prohibit the selection of the Ith contact switch as the target contact switch when the target load current value is greater than or equal to the maximum load current value; the third processing subunit is used to use the Ith contact switch as an alternative switch when the target load current value is less than the maximum load current value.

[0075] Optionally, the fourth processing unit 304 includes: a second acquisition subunit and a first determination subunit. The second acquisition subunit is used to acquire the closing delay time of each candidate switch when there are X candidate switches, wherein X is a positive integer less than or equal to L, and the closing delay time of each candidate switch represents the preparation time for the candidate switch to complete the closing operation; the first determination subunit is used to determine a target contact switch from the X candidate switches according to the closing delay time of each candidate switch to perform the closing operation.

[0076] Optionally, the first determination subunit includes: a sorting module and a first processing module. The sorting module is used to sort the X candidate switches according to the closing delay time of each candidate switch to obtain a sorting result; the first processing module is used to select the candidate switch with the shortest closing delay time as the target contact switch according to the sorting result.

[0077] Optionally, the fourth processing unit 304 includes: a detection unit and a first determination unit. The detection unit is used to detect the voltage across the target contact switch; the first determination unit is used to determine that the target contact switch performs a closing operation when it is detected that there is no voltage on the first side of the target contact switch and there is voltage on the second side of the target contact switch, so as to switch the power supply of the second switch to the target power supply set on the second side of the target contact switch.

[0078] Optionally, the power supply switching device of the distribution network includes: a fifth processing unit, configured to prohibit the target contact switch from performing a closing operation when it is detected that there is voltage on both sides of the target contact switch, or that there is voltage on the first side of the target contact switch and there is no voltage on the second side of the target contact switch.

[0079] Optionally, the third processing unit 303 includes: a sending subunit, used to use a target communication method to send the load current value of the first switch connected to the target power supply to the connecting switch belonging to the same current branch as the target power supply, wherein the target communication method is used to transmit the load current value of the first switch between adjacent related switches in a closed state until the load current value of the first switch is sent to the connecting switch belonging to the same current branch as the target power supply.

[0080] Optionally, the power supply switching device of the distribution network includes: a sixth processing unit, which is used to select an alternative switch from all alternative switches except the target contact switch as a new target contact switch to perform a closing operation according to a sorting result when it is detected that the target contact switch fails to perform a closing operation.

[0081] According to another aspect of the present application, an electronic device is also provided, wherein the electronic device includes one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors execute any one of the above-mentioned power supply switching methods of the distribution network.

[0082] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0083] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0084] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0085] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0086] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0087] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0088] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A power supply switching method for a distribution network, applied to the distribution network, wherein: The distribution network includes L tie switches, and a power supply is provided on both sides of each tie switch, L is an integer greater than 1, and is characterized in that it includes: When a fault is detected in a line between a first switch and a second switch in the distribution network, a load current value of the second switch is sent to the L tie switches, wherein the first switch and the second switch are located on a first side of the L tie switches, and the second switch is closer to the L tie switches than the first switch; Using a power source disposed on a second side of each tie switch as a target power source, wherein the second side and the first side represent two opposite sides of each tie switch respectively; Sending the load current value of the first switch connected to the target power supply to the tie switch belonging to the same current branch as the target power supply; The method includes: sending a load current value of a first switch connected to the target power source to a tie switch belonging to the same current branch as the target power source, comprising: The load current value of the first switch connected to the target power supply is sent to the tie switch that belongs to the same current branch as the target power supply by using a target communication method, wherein the target communication method is used to transmit the load current value of the first switch between adjacent related switches in a closed state until the load current value of the first switch is sent to the tie switch that belongs to the same current branch as the target power supply; According to the load current value of the second switch received by each tie switch and the load current value of the first switch, determine a target tie switch from the L tie switches to perform a closing operation, so as to switch the power supply of the second switch to a target power supply provided on the second side of the target tie switch; In the process of determining a target tie switch from the L tie switches to perform a closing operation according to the load current value of the second switch and the load current value of the first switch received by each tie switch, the method includes: The load current value of the second switch received by the I-th tie switch and the load current value of the first switch are summed up to obtain a target load current value of the I-th tie switch; Obtaining a maximum load current value of a primary switch corresponding to the I-th tie switch, wherein the primary switch corresponding to the I-th tie switch is a primary switch of a target power source of the I-th tie switch; When the target load current value is greater than or equal to the maximum load current value, it is prohibited to select the Ith tie switch as the target tie switch; When the target load current value is less than the maximum load current value, the Ith tie switch is used as an alternative switch.

2. The power supply switching method of the distribution network according to claim 1, characterized in that: According to the load current value of the second switch received by each tie switch and the load current value of the first switch, a target tie switch is determined from the L tie switches to perform a closing operation, including: In the case where there are X alternative switches, a closing delay time length of each alternative switch is obtained, wherein X is a positive integer less than or equal to L, and the closing delay time length of each alternative switch represents the preparation time length for the alternative switch to complete the closing operation; A target tie switch is determined from the X candidate switches according to the closing delay time of each candidate switch to perform a closing operation.

3. The power supply switching method of the distribution network according to claim 2, characterized in that: Determining a target tie switch from the X candidate switches according to the closing delay time of each candidate switch to perform a closing operation includes: Sorting the X candidate switches according to the closing delay time of each candidate switch to obtain a sorting result; According to the sorting result, the candidate switch with the shortest closing delay is used as the target tie switch.

4. The power supply switching method of the distribution network according to claim 1, characterized in that: Determining a target tie switch from the L tie switches to perform a closing operation to switch the power supply of the second switch to a target power supply provided on a second side of the target tie switch, comprising: Detecting the voltage across the target tie switch; When it is detected that there is no voltage on the first side of the target tie switch and there is voltage on the second side of the target tie switch, it is determined that the target tie switch performs a closing operation to switch the power supply of the second switch to a target power supply provided on the second side of the target tie switch.

5. The power supply switching method of the distribution network according to claim 4, characterized in that: After detecting the voltage across the target tie switch, the power supply switching method of the distribution network further includes: When it is detected that voltage exists on both sides of the target tie switch, or when voltage exists on a first side of the target tie switch and no voltage exists on a second side of the target tie switch, the target tie switch is prohibited from performing a closing operation.

6. The power supply switching method of the distribution network according to claim 3, characterized in that: After the candidate switch with the shortest closing delay is selected as the target tie switch according to the sorting result, the power supply switching method of the distribution network further includes: In the case where it is detected that the target tie switch fails to perform the closing operation, a candidate switch is selected from all candidate switches except the target tie switch according to the sorting result as a new target tie switch to perform the closing operation.

7. A power supply switching device for a distribution network, applied to the distribution network, wherein: The distribution network includes L tie switches, and a power supply is respectively arranged on both sides of each tie switch, where L is an integer greater than 1, and is characterized in that the power supply switching device of the distribution network includes: a first processing unit, configured to send a load current value of the second switch to the L tie switches when a fault is detected in a line between a first switch and a second switch in the distribution network, wherein the first switch and the second switch are located on a first side of the L tie switches, and the second switch is closer to the L tie switches than the first switch; A second processing unit, configured to use a power source disposed on a second side of each tie switch as a target power source, wherein the second side and the first side represent two opposite sides of each tie switch respectively; A third processing unit, configured to send the load current value of the first switch connected to the target power source to a tie switch belonging to the same current branch as the target power source; The third processing unit includes: a sending subunit, which is used to send the load current value of the first switch connected to the target power supply to the connecting switch belonging to the same current branch as the target power supply by using the target communication method, wherein the target communication method is used to transmit the load current value of the first switch between adjacent related ones in a closed state until the load current value of the first switch is sent to the connecting switch belonging to the same current branch as the target power supply; a fourth processing unit, configured to determine a target tie switch from the L tie switches to perform a closing operation according to the load current value of the second switch received by each tie switch and the load current value of the first switch, so as to switch the power supply of the second switch to a target power supply provided on a second side of the target tie switch; Wherein, the fourth processing unit comprises: The first processing subunit is used to calculate the sum of the load current value of the second switch and the load current value of the first switch received by the Ith tie switch to obtain a target load current value of the Ith tie switch; A first acquisition subunit is used to acquire a maximum load current value of a primary switch corresponding to an I-th tie switch, wherein the primary switch corresponding to the I-th tie switch is a primary switch of a target power source of the I-th tie switch; The second processing subunit is used to prohibit the selection of the Ith tie switch as the target tie switch when the target load current value is greater than or equal to the maximum load current value; The third processing subunit is used to use the Ith tie switch as a standby switch when the target load current value is less than the maximum load current value.

8. An electronic device, characterized in that: It includes one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors execute the power supply switching method for the distribution network as described in any one of claims 1 to 6.

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