Power transfer switching method and device, terminal and storage medium

Abstract

The present application relates to the technical field of power grid operation control, and particularly relates to a transfer power supply switching method and device, a terminal and a storage medium, which first obtains the priority of each outgoing line of a first transformer substation and the state of each line before the power failure of the whole station, and judges whether the operation can be performed by referring to the state of each line before the power failure, so that the safety of the operation can be improved, and blind transfer power supply can be prevented, so as to cause power grid accidents or personal accidents. In the process of transfer power supply, first, each switch of the first transformer substation is opened to realize the isolation of each unit, so as to prevent subsequent transfer power supply from causing accidents or expansion of accidents. Then, when closing, the residual capacity and the priority are considered, and the closing operation is performed according to the residual capacity, the priority and the state of each line before the power failure, so that the repeated use of the residual capacity can be ensured, and the electric energy can be distributed to the outgoing line with the most urgent power consumption as much as possible.

Description

Technical Field

[0001] This invention relates to the field of power grid operation control technology, and in particular to a power supply switching method, device, terminal and storage medium. Background Technology

[0002] The power distribution network consists of overhead lines, cables, poles, distribution transformers, disconnect switches, reactive power compensation devices, and some auxiliary facilities. It plays an important role in distributing electrical energy within the power grid.

[0003] Loop-connection power supply is an operation that converts two or more distribution lines of the same voltage level from radial connection to loop connection by closing a tie switch. It is an effective means to reduce the number of households affected by power outages due to maintenance and improve power supply reliability.

[0004] Currently, in the process of power distribution network loop transfer, one method involves power workers comprehensively judging the status of both sides of the power transfer and operating accordingly. Although there is a general power transfer workflow, the actual operation involves the interaction of multiple parties and parameters, which often leads to various drawbacks in the judgment and operation process. For example, the procedures are cumbersome, or errors in the work process may lead to an expansion of the power outage area, and in severe cases, may lead to catastrophic accidents.

[0005] Therefore, it is necessary to develop a power supply switching method to improve the problems of cumbersome procedures and long time consumption in the existing power supply technology. Summary of the Invention

[0006] The present invention provides a method, apparatus, terminal and storage medium for switching power supply, which solves the problem of cumbersome procedures for switching power supply in the prior art.

[0007] In a first aspect, embodiments of the present invention provide a power supply switching method, comprising:

[0008] Obtain the priority of each outgoing line of the first substation and the status of each line before the entire substation is shut down; if the status of each line before the entire substation is shut down meets the predetermined conditions, then execute the switching procedure:

[0009] Open all switches in the first substation;

[0010] The tie switch is closed, and the tie switch includes: a switch for connecting the secondary busbar of the first substation and the secondary busbar of the second substation, and a switch for connecting each section of the secondary busbar of the first substation; the real-time remaining capacity is obtained, and the real-time remaining capacity includes the capacity of the second substation.

[0011] Based on the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the power outage, the outgoing line switches are opened or closed, and the outgoing lines are electrically connected to the secondary bus of the first substation through the outgoing line switches.

[0012] In one possible implementation, the status of the lines includes: transformer outgoing switch tripping signal, protection action signal, and station-wide interlocking signal. If the status of each line before the station-wide power outage meets predetermined conditions, then a switching procedure is executed, including:

[0013] If the transformer outgoing switch tripping signal is not set, the protection action signal is not set, and the station-wide interlocking signal is not set, then the switching step is executed.

[0014] If at least one of the following conditions occurs: the transformer outgoing switch tripping signal is set, the protection action signal is set, and the station-wide interlocking signal is set, then the switching procedure will not be executed.

[0015] In one possible implementation, prior to closing the tie switch, the following is included:

[0016] Stop grid-connected power generation from distributed power sources, wherein the distributed power source is a distributed power source connected to the secondary bus of the first substation.

[0017] In one possible implementation, the remaining capacity further includes: the capacity of the distributed power source, prior to obtaining the real-time remaining capacity, including:

[0018] The distributed power source is activated and connected to the grid for power generation.

[0019] In one possible implementation, the priority includes: an activation priority and a deactivation priority. The step of opening or closing the switches of each outgoing line based on the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the total power outage includes:

[0020] If the real-time remaining capacity is greater than the first threshold, then each outgoing switch is closed sequentially according to the commissioning priority of each outgoing line and the status of each line before the power outage of the entire station, until the real-time remaining capacity is less than or equal to the first threshold.

[0021] If the real-time remaining capacity is less than the second threshold, the switches of each outgoing line are sequentially tripped according to the disconnection priority of each outgoing line until the real-time remaining capacity is greater than or equal to the second threshold.

[0022] In one possible implementation, the state of the line includes: the position of the outgoing line switches; and the step of sequentially closing each outgoing line switch according to the activation priority of each outgoing line and the state of each line before the total power outage includes:

[0023] Closing procedure: If the real-time remaining capacity is greater than the first threshold, then select the outgoing line with the highest priority from all outgoing lines whose outgoing switch position was closed before the power outage and whose current outgoing switch position is open.

[0024] Close the outgoing switch of the outgoing line with the highest priority.

[0025] If the real-time remaining capacity is greater than the first threshold, then proceed to the closing step.

[0026] In one possible implementation, the state of the line includes: the load of the outgoing lines; and the step of sequentially closing each outgoing line switch according to the commissioning priority of each outgoing line and the state of each line before the total power outage includes:

[0027] Closing procedure: If the real-time remaining capacity is greater than the first threshold, then select the outgoing line with the highest priority from all outgoing lines where the difference between the real-time remaining capacity and the outgoing load is greater than or equal to the second threshold and the current outgoing switch position is the open position.

[0028] Close the outgoing switch of the outgoing line with the highest priority.

[0029] If the real-time remaining capacity is greater than the first threshold, then proceed to the closing step.

[0030] Secondly, embodiments of the present invention provide a power supply switching device, comprising:

[0031] The data acquisition module is used to acquire the priority of each outgoing line of the first substation and the status of each line before the whole station is shut down.

[0032] The condition verification module is used to determine whether the status of each line before the power outage of the entire station meets the predetermined conditions;

[0033] The whole station tripping module is used to trip each switch of the first substation when the status of each line before the whole station power outage meets the predetermined conditions.

[0034] The tie switch closing module is used to close the tie switch when the status of each line before the power outage of the entire station meets the predetermined conditions.

[0035] A real-time remaining capacity acquisition module is used to acquire the real-time remaining capacity when the status of each line before the power outage of the entire station meets predetermined conditions; and,

[0036] The switching module is used to open or close each outgoing switch according to the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the power outage of the entire station. The outgoing lines are electrically connected to the secondary bus of the first substation through the outgoing switches.

[0037] Thirdly, embodiments of the present invention provide a terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation thereof.

[0038] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation thereof.

[0039] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows:

[0040] This invention discloses a power transfer switching method. First, it obtains the priority of each outgoing line of a first substation and the status of each line before a station-wide power outage. Based on the status of each line before the outage, it determines whether operation is permissible. Therefore, it improves operational safety and prevents blind power transfer that could lead to grid accidents or personal injuries. During the power transfer process, each switch of the first substation is first opened to isolate each unit and prevent subsequent power transfers from causing or escalating accidents. Then, when closing the switches, it considers remaining capacity and priority, performing the closing operation based on the remaining capacity, priority, and the status of each line before the outage. This ensures the reuse of remaining capacity and allocates power to the outgoing lines with the most urgent power needs. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a typical power grid structure diagram provided by the embodiments of the present invention;

[0043] Figure 2 This is a flowchart of the power supply switching method provided in the embodiments of the present invention;

[0044] Figure 3 This is a functional block diagram of the power supply switching device provided in the embodiments of the present invention;

[0045] Figure 4 This is a terminal function block diagram provided by an embodiment of the present invention. Detailed Implementation

[0046] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, so as to provide a thorough understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0048] The embodiments of the present invention will be described in detail below. This example is implemented based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. However, the protection scope of the present invention is not limited to the following embodiments.

[0049] Figure 1 This illustrates a typical power grid structure for power transfer.

[0050] The diagram includes two substations with the same voltage level. Each substation includes: an incoming busbar 101, a transformer incoming switch 102, a transformer 103, a transformer outgoing switch 104, a secondary busbar 109, a secondary busbar sectionalizing switch 105, and an outgoing switch 106. In some application scenarios, a distributed power source 107 may also be included. The incoming busbar 101 supplies power to the transformer 103. The primary side of the transformer 103 is connected to the incoming busbar 101 via the transformer incoming switch 102. The secondary side of the transformer 103 is connected to the secondary busbar 109 via the transformer outgoing switch 104. In some embodiments, the secondary busbar 109 is segmented, with each segment connected via the secondary busbar sectionalizing switch 105. The secondary busbar 109 is connected to various outgoing lines or the distributed power source 107 via the outgoing switch 106.

[0051] The two substations operate independently of each other. For example, in one application scenario, if the primary bus of one substation is de-energized, it will not affect the primary side of the other substation.

[0052] Therefore, when a substation experiences a complete power outage, power can be supplied using the remaining capacity of another substation, such as... Figure 1 If the transformer 113 of the second substation has remaining capacity, the secondary busbars of the two substations can be connected together through the tie switch 108.

[0053] Based on the above-mentioned typical power grid structure for power transfer, the present invention will be discussed in detail.

[0054] Figure 2 A flowchart of a power supply switching method provided for an embodiment of the present invention.

[0055] like Figure 2 The diagram illustrates the implementation flowchart of the power supply switching system provided by an embodiment of the present invention, which is described in detail below:

[0056] In step 201, the priority of each outgoing line of the first substation and the status of each line before the power outage of the entire station are obtained.

[0057] For example, outgoing lines refer to lines connected to loads. Different loads have different attributes, and different priorities are assigned according to the attributes of the loads. The order of power supply and disconnection is selected according to the priority. Generally speaking, lines with higher priority should be guaranteed power supply first, and therefore should be supplied first. For outgoing lines with lower priority, disconnection should be performed first when power resources are scarce. Obtaining the priority of outgoing lines is the foundational work for subsequent power supply or disconnection operations.

[0058] The status of each line includes: the line load, which is the parameter of the actual electrical energy consumed by the line; the status of the line switch, such as whether the switch is open or closed; and in some cases, the reason for the opening may be indicated, such as the opening due to overcurrent or grounding; primary and secondary bus voltages; secondary bus current, etc. These parameters are all part of the status of the line. Those skilled in the art should understand that the above description is only an example provided for ease of understanding and is not a limitation.

[0059] In step 202, if the status of each line before the power outage of the entire station meets the predetermined conditions, the switching step is executed.

[0060] In some embodiments, the status of the line includes: transformer outgoing switch tripping signal, protection action signal, and station-wide interlocking signal. Step 202 includes:

[0061] If the transformer outgoing switch tripping signal is not set, the protection action signal is not set, and the station-wide interlocking signal is not set, then the switching step is executed.

[0062] If at least one of the following conditions occurs: the transformer outgoing switch tripping signal is set, the protection action signal is set, and the station-wide interlocking signal is set, then the switching procedure will not be executed.

[0063] For example, the transformer outgoing line switch tripping signal includes: a manual tripping signal indicating manual tripping operation of the transformer outgoing line switch and a remote tripping signal indicating remote tripping operation of the transformer. The transformer protection action signals include: overcurrent protection, grounding protection and differential protection. The station-wide blocking signal is used to indicate that the station does not meet the conditions for operation.

[0064] Therefore, we cannot supply power to the various loads on the line that are experiencing any one or more of the above signals, including power transfer, otherwise it may cause an accident.

[0065] Those skilled in the art should understand that the above description of signals is merely an example for ease of understanding and not a limitation.

[0066] In step 203, each switch of the first substation is tripped.

[0067] For example, after the target substation (i.e., the first substation mentioned above) is completely shut down, the load and power supply should be isolated. The purpose is to prevent the power from being supplied back to the transformer side after the power supply is transferred.

[0068] In step 204, the tie switch is closed. The tie switch includes: a switch for connecting the secondary busbar of the first substation and the secondary busbar of the second substation, and a switch for connecting each section of the secondary busbar of the first substation; the real-time remaining capacity is obtained, and the real-time remaining capacity includes the capacity of the second substation.

[0069] The tie switch includes: a switch for connecting the secondary busbar of the substation supplying the residual load to the secondary busbar of the target substation, for Figure 1 The diagram shows a tie switch 108 and two switches connected to it; a section switch for connecting busbar sections, for Figure 1 The diagram shows section switch 105. When each tie switch is closed, the secondary busbar of the target substation is connected to the secondary busbar of the substation supplying the remaining load, thus enabling the target substation to initially meet the power supply requirements.

[0070] In step 205, the real-time remaining capacity is obtained, which includes the capacity of the second substation.

[0071] For example, the remaining capacity includes the capacity of the second substation, and in some cases may also include the capacity of the distributed power source. Obtaining the remaining capacity is a guarantee step for performing the closing operation to prevent insufficient remaining capacity from blindly closing the circuit and causing the fault to escalate.

[0072] In step 206, each outgoing switch is opened or closed according to the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the power outage of the entire station. The outgoing lines are electrically connected to the secondary bus of the first substation through the outgoing switches.

[0073] In some implementations, the priority includes: input priority and cutoff priority, and step 205 includes:

[0074] If the real-time remaining capacity is greater than the first threshold, then each outgoing switch is closed sequentially according to the commissioning priority of each outgoing line and the status of each line before the power outage of the entire station, until the real-time remaining capacity is less than or equal to the first threshold.

[0075] If the real-time remaining capacity is less than the second threshold, the switches of each outgoing line are sequentially tripped according to the disconnection priority of each outgoing line until the real-time remaining capacity is greater than or equal to the second threshold.

[0076] In some embodiments, the state of the line includes the position of the outgoing switch, and step 205 includes:

[0077] Closing procedure: If the real-time remaining capacity is greater than the first threshold, then select the outgoing line with the highest priority from all outgoing lines whose outgoing switch position was closed before the power outage and whose current outgoing switch position is open.

[0078] Close the outgoing switch of the outgoing line with the highest priority.

[0079] If the real-time remaining capacity is greater than the first threshold, then proceed to the closing step.

[0080] For example, the switching process should focus on the current remaining capacity, the priority of each outgoing line, and the status of each line before the entire station is shut down.

[0081] Specifically, the status of each line before the power outage should be considered first. Outgoing lines that were in the open position before the power outage should obviously be excluded when closing the switch. Otherwise, if personnel are performing maintenance on the open lines before the power outage, closing the switch could cause an accident.

[0082] Then, the real-time remaining capacity should be considered, which is the first threshold mentioned above. If the remaining capacity is small, considering that the remaining capacity will fluctuate, it will further lead to frequent closing and opening of the outgoing lines, which will bring instability to the power supply.

[0083] Finally, priority should be considered. The closing should be carried out in stages. After connecting a portion of the outgoing lines, the real-time remaining capacity should be obtained. When the remaining capacity is sufficient, the next round of outgoing line connection should be carried out until the remaining capacity is less than or equal to the first threshold.

[0084] When the remaining capacity is less than a certain amount during operation, all outgoing lines should be disconnected. In some application scenarios, the disconnection priority is different from the commissioning priority. That is to say, some lines may be commissioned first and then disconnected as early as possible.

[0085] In addition, it should be noted that in some application scenarios, the highest priority load may be higher than the remaining capacity, and the remaining capacity may be higher than the first threshold. In this case, putting the highest priority outgoing line into operation will cause the remaining load to be completely exhausted, which will further cause the transformer providing the remaining capacity to go into protection mode, resulting in a complete power outage of both substations.

[0086] Therefore, obtaining the capacity just before the power outage is necessary. This application scenario should be considered when deploying the system. First, obtain the current remaining capacity and ensure that it is greater than a first threshold.

[0087] Then, outgoing lines whose remaining capacity differs from their outgoing load by more than a second threshold are selected. Among these selected outgoing lines, they are then put into operation according to priority until the remaining capacity is less than the first threshold.

[0088] As we can see, the above-mentioned investment methods ensured the safety of the two substations.

[0089] In addition, some application scenarios involve distributed power sources, including wind power and solar power. For application scenarios with distributed power sources, the grid connection process during power transfer should be considered.

[0090] In step 2031, prior to closing the tie switch, the following is included:

[0091] Stop grid-connected power generation from distributed power sources, wherein the distributed power source is a distributed power source connected to the secondary bus of the first substation.

[0092] For example, the distributed power source should be stopped from generating electricity at the latest before the tie switch is closed. Figure 1 In the example above, this can be achieved by disconnecting the switches of the distributed power sources. Disconnecting the distributed power sources is to prevent them from being out of sync with the power sources they are supplying to the grid, which could cause grid accidents.

[0093] Before step 206, step 2501 is also included: the capacity of the distributed power source, which includes the following before obtaining the real-time remaining capacity:

[0094] The distributed power source is activated and connected to the grid for power generation.

[0095] For example, after the tie switch is closed, the target substation initially has the ability to transfer power, and the secondary busbar is connected to the target substation. At this time, distributed power sources can be connected to maximize the remaining capacity.

[0096] Because the capacity is maximized by connecting distributed power sources, the distributed power sources should be connected to the secondary bus to achieve grid-connected power generation before obtaining the real-time capacity.

[0097] The present invention provides a method for switching power supply. First, it obtains the priority of each outgoing line of the first substation and the status of each line before a station-wide power outage. Based on the status of each line before the outage, it determines whether operation is permissible. Therefore, it improves operational safety and prevents blind power transfer that could lead to grid accidents or personal injuries. During the power transfer process, each switch of the first substation is first opened to isolate each unit, preventing subsequent power transfers from causing accidents or escalating existing ones. Then, when closing the switches, it considers remaining capacity and priority, performing the closing operation based on the remaining capacity, priority, and the status of each line before the outage. This ensures the reuse of remaining capacity and allocates power to the outgoing lines with the most urgent power needs.

[0098] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0099] The following are embodiments of the apparatus of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0100] Figure 3 This is a functional block diagram of the power supply switching device provided in the embodiments of the present invention, with reference to... Figure 3 The power metering equipment operation and maintenance device 3 includes: a data acquisition module 301, a condition verification module 302, a station-wide tripping module 303, a tie switch closing module 304, a real-time remaining capacity acquisition module 305, and a switching module 306.

[0101] The data acquisition module 301 is used to acquire the priority of each outgoing line of the first substation and the status of each line before the power outage of the entire station.

[0102] Condition verification module 302 is used to determine whether the status of each line before the power outage of the entire station meets the predetermined conditions;

[0103] The whole station tripping module 303 is used to trip each switch of the first substation when the status of each line before the whole station power outage meets the predetermined conditions.

[0104] The tie switch closing module 304 is used to close the tie switch when the status of each line before the power outage of the entire station meets the predetermined conditions.

[0105] The real-time remaining capacity acquisition module 305 is used to acquire the real-time remaining capacity when the status of each line before the power outage of the entire station meets the predetermined conditions.

[0106] The switching module 306 is used to open or close each outgoing switch according to the real-time remaining capacity, the priority of each outgoing line and the status of each line before the power outage of the entire station, when the status of each line before the power outage of the entire station meets the predetermined conditions. The outgoing lines are electrically connected to the secondary bus of the first substation through the outgoing switches.

[0107] Figure 4 This is a functional block diagram of the terminal provided in an embodiment of the present invention. For example... Figure 4 As shown, the terminal 4 in this embodiment includes: a processor 400, a memory 401, and a computer program 402 stored in the memory 401 and executable on the processor 400. When the processor 400 executes the computer program 402, it implements the steps of the various power switching methods and embodiments described above, for example... Figure 2 Steps 201 to 206 are shown.

[0108] For example, the computer program 402 may be divided into one or more modules / units, which are stored in the memory 401 and executed by the processor 400 to complete the present invention.

[0109] The terminal 4 can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The terminal 4 may include, but is not limited to, a processor 400 and a memory 401. Those skilled in the art will understand that... Figure 4 This is merely an example of terminal 4 and does not constitute a limitation on terminal 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0110] The processor 400 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0111] The memory 401 can be an internal storage unit of the terminal 4, such as a hard disk or memory of the terminal 4. The memory 401 can also be an external storage device of the terminal 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the terminal 4. Furthermore, the memory 401 can include both internal storage units and external storage devices of the terminal 4. The memory 401 is used to store the computer program and other programs and data required by the terminal. The memory 401 can also be used to temporarily store data that has been output or will be output.

[0112] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments 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. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the aforementioned method embodiments, and will not be repeated here.

[0113] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0114] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0115] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and 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 through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0116] 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, depending on actual needs.

[0117] Furthermore, 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. The integrated unit can be implemented in hardware or as a software functional unit.

[0118] If the integrated module / unit 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, all or part of the processes in the above-described embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the various power transfer switching methods and power transfer switching devices described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0119] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for switching power supply, characterized in that, include: Obtain the priority of each outgoing line of the first substation and the status of each line before the entire station is shut down. If the status of each line before the power outage meets the predetermined conditions, then the switching procedure is executed: Open all switches in the first substation; The tie switch is closed, and the tie switch includes: a switch for connecting the secondary busbar of the first substation and the secondary busbar of the second substation, and a switch for connecting each section of the secondary busbar of the first substation; the real-time remaining capacity is obtained, and the real-time remaining capacity includes the capacity of the second substation. Based on the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the power outage, the outgoing line switches are opened or closed, and the outgoing lines are electrically connected to the secondary bus of the first substation through the outgoing line switches. The priorities include: activation priority and deactivation priority. The step of opening or closing the switches of each outgoing line based on the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the total power outage includes: If the real-time remaining capacity is greater than the first threshold, then each outgoing switch is closed sequentially according to the commissioning priority of each outgoing line and the status of each line before the power outage of the entire station, until the real-time remaining capacity is less than or equal to the first threshold. If the real-time remaining capacity is less than the second threshold, the switches of each outgoing line are sequentially tripped according to the disconnection priority of each outgoing line until the real-time remaining capacity is greater than or equal to the second threshold. The status of the lines includes: the load of the outgoing lines and the position of the outgoing line switches. The step of sequentially closing each outgoing line switch according to the activation priority of each outgoing line and the status of each line before the total power outage includes: Closing procedure: If the real-time remaining capacity is greater than the first threshold, then select the outgoing line with the highest priority from all outgoing lines where the difference between the real-time remaining capacity and the outgoing load is greater than or equal to the second threshold and the current outgoing switch position is the open position. Close the outgoing switch of the outgoing line with the highest priority. If the real-time remaining capacity is greater than the first threshold, then proceed to the closing step.

2. The power supply switching method according to claim 1, characterized in that, The status of the lines includes: transformer outgoing switch tripping signal, protection action signal, and station-wide interlocking signal. If the status of each line before the station-wide power outage meets predetermined conditions, then the switching procedure is executed, including: If the transformer outgoing switch tripping signal is not set, the protection action signal is not set, and the station-wide interlocking signal is not set, then the switching step is executed. If at least one of the following conditions occurs: the transformer outgoing switch tripping signal is set, the protection action signal is set, and the station-wide interlocking signal is set, then the switching procedure will not be executed.

3. The power supply switching method according to claim 1, characterized in that, Before the connection switch is closed, the following is included: Stop grid-connected power generation from distributed power sources, wherein the distributed power source is a distributed power source connected to the secondary bus of the first substation.

4. The power supply switching method according to claim 3, characterized in that, The remaining capacity also includes: the capacity of the distributed power source, which includes, before obtaining the real-time remaining capacity: The distributed power source is activated and connected to the grid for power generation.

5. A power supply switching device, characterized in that, For implementing the power supply switching method as described in any one of claims 1-4, the power supply switching device comprises: The data acquisition module is used to acquire the priority of each outgoing line of the first substation and the status of each line before the whole station is shut down. The condition verification module is used to determine whether the status of each line before the power outage of the entire station meets the predetermined conditions; The whole station tripping module is used to trip each switch of the first substation when the status of each line before the whole station power outage meets the predetermined conditions. The tie switch closing module is used to close the tie switch when the status of each line before the power outage of the entire station meets the predetermined conditions. A real-time remaining capacity acquisition module is used to acquire the real-time remaining capacity when the status of each line before the power outage of the entire station meets predetermined conditions; and, The switching module is used to open or close each outgoing switch according to the real-time remaining capacity, the priority of each outgoing line, and the status of each line before the power outage of the entire station. The outgoing lines are electrically connected to the secondary bus of the first substation through the outgoing switches.

6. A terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 4 above.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 4 above.

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