Power grid self-healing method, device, terminal and storage medium

Abstract

The present invention relates to the field of power grid operation control technology, and in particular to a power grid self-healing method, device, terminal and storage medium, wherein the power grid self-healing method comprises: obtaining an identifier of a faulty line; determining a switch to be opened and a switch to be closed according to the identifier of the faulty line; opening the switch to be opened; and closing the switch to be closed. The power grid self-healing method disclosed in the embodiment of the present invention determines isolation, power transfer and grid connection schemes according to the location of the faulty line, and is clear in structure and purpose, thereby accelerating the self-healing process and reducing the time of power outage.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid planning, operation and control, and in particular to a power grid self-healing method, device, terminal and storage medium. Background Art

[0002] Electricity is a clean secondary energy source. In order to ensure the sustainable development of society, more and more new energy sources and new energy storage devices will be applied to the power system. A large part of the application of new energy sources such as wind energy, solar energy, and biomass energy is decentralized and has a small capacity. These decentralized power generation devices with a capacity ranging from several kilowatts to tens of megawatts, environmentally compatible, and energy-saving, such as gas turbines, internal combustion engines, small photovoltaic power stations, fuel cells, wind turbines, etc., which are arranged near the power load, are called distributed generation (DG).

[0003] Distributed power sources are connected to the power grid system through the distribution network. The distribution network is composed of overhead lines, cables, towers, distribution transformers, disconnectors, reactive power compensation devices and some ancillary facilities, and plays an important role in distributing electric energy in the power grid.

[0004] There is an existing view that although distributed power sources can make use of renewable energy as much as possible, they bring considerable troubles to the safe operation of the power grid and the power generation of power stations. For example, the grid-connected power generation of distributed power sources is unstable, and these instabilities will cause the protection devices in the distribution network to malfunction, reducing the reliability of power use. On the other hand, the power grid with distributed power sources brings considerable difficulties to the troubleshooting and self-healing of the power grid when a fault occurs.

[0005] It can be seen that distributed power generation has brought challenges to grid planning, control and operation safety. Based on this, it is necessary to develop and design a grid self-healing method to solve the problem that the grid structure with distributed power generation in the prior art cannot be quickly checked and self-healed when a fault occurs. Summary of the invention

[0006] The embodiments of the present invention provide a power grid self-healing method, device, terminal and storage medium, which are used to solve the problem that the self-healing process of the power grid structure with distributed power sources in the prior art is difficult.

[0007] In a first aspect, an embodiment of the present invention provides a power grid self-healing method, which is applied to a power grid with distributed power sources, and the method includes:

[0008] Obtain the identification of the faulty line;

[0009] Determine the switch to be opened and the switch to be closed according to the identification of the fault line, wherein the switch to be opened is used to isolate the fault line, and the switch to be closed is used to connect the power outage area and the target distributed power source to the power transfer line, the power outage area is the power outage area affected by the fault line, the target distributed power source is the distributed power source connected to the fault line, and the power transfer line is the line that transfers power to the power outage area;

[0010] Opening the switch to be opened;

[0011] Close the switch to be closed.

[0012] In a possible implementation manner, obtaining the identifier of the faulty line includes:

[0013] Obtaining a switch identifier, wherein the switch identifier is an identifier of a switch that generates a protection action;

[0014] The identifier of the faulty line is determined according to the switch identifier.

[0015] In a possible implementation manner, determining the identifier of the faulty line according to the switch identifier includes:

[0016] If the switch identifier is the identifier of the incoming switch, the fault line is a bus section, and the identifier of the bus section is obtained as the identifier of the fault line, wherein the bus section is the bus section connected to the incoming switch;

[0017] If the switch identifier is an identifier of a ring network switch, the faulty line is an incoming line, and the identifier of the incoming line is obtained as the identifier of the faulty line, wherein the incoming line is an incoming line connected to the ring network switch;

[0018] If the switch identifier is an identifier of a grid-connected switch, the faulty line is a grid-connected line, and the identifier of the grid-connected line is obtained as the identifier of the faulty line, wherein the grid-connected line is a line connected to the grid-connected switch.

[0019] In a possible implementation, determining a switch to be opened and a switch to be closed according to the fault line includes:

[0020] If the fault line is a bus section, the switch to be opened includes: a switch connecting the target distributed power source and the fault line and an outgoing switch connected to the bus section, and the switch to be closed includes: a second grid-connected switch and a tie switch, wherein the second grid-connected switch is a switch connecting the target distributed power source and the transfer power supply line, and the tie switch is a switch connecting the transfer power supply line;

[0021] If the faulty line is an incoming line, the switch to be opened includes: a switch connecting the incoming line and a ring network, wherein the ring network is a ring network connected to the incoming line, and the switch to be closed includes: each outgoing line switch on the same power supply line as the faulty line;

[0022] If the fault line is a grid-connected line, the switch to be opened includes: an incoming line switch and a switch connecting the incoming line and the ring network, wherein the switch to be closed includes: a third grid-connected switch and each outgoing line switch on the same power supply line as the incoming line, wherein the third grid-connected switch is a switch connecting the target distributed power source and the outgoing line.

[0023] In one possible implementation, if the faulty line is a busbar section, the transfer power supply line is a normal power supply line in the same power distribution room as the faulty line.

[0024] In a possible implementation, if the faulty line is a bus section, closing the switch to be closed includes:

[0025] Obtaining the remaining capacity of the power transfer line and the load of the faulty line, wherein the load of the faulty line is the load of the faulty line before the fault occurs;

[0026] If the difference between the remaining capacity of the power transfer line and the load of the faulty line is greater than a threshold, closing the switch to be closed;

[0027] If the difference between the remaining capacity of the transfer power supply line and the load of the fault line is less than or equal to the threshold, then the switch to be closed will be closed when the difference between the remaining capacity of the transfer power supply line and the load of the fault line is greater than the threshold.

[0028] In a second aspect, an embodiment of the present invention provides a power grid self-healing device, characterized in that it includes:

[0029] A fault line identification acquisition module, used to acquire the identification of the fault line;

[0030] An opening and closing judgment module is used to determine the switch to be opened and the switch to be closed according to the identification of the fault line, wherein the switch to be opened is used to isolate the fault line, and the switch to be closed is used to connect the power outage area and the target distributed power source to the power transfer line, the power outage area is the power outage area affected by the fault line, the target distributed power source is the distributed power source connected to the fault line, and the power transfer line is the line that transfers power to the power outage area;

[0031] A trip signal output module is used to output a signal indicating that the switch to be tripped is tripped; and

[0032] The closing signal output module is used to output a signal indicating that the switch to be closed is closed.

[0033] In a third aspect, an embodiment of the present invention provides a power grid self-healing terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method described in the first aspect or any possible implementation of the first aspect.

[0034] In a fourth aspect, an embodiment of the present invention provides a power grid self-healing system, comprising the power grid self-healing terminal described in the first aspect, and further comprising: a power distribution room terminal; the power distribution room terminal is signal-connected to the power grid self-healing terminal;

[0035] The power distribution room terminal is used to collect the actions of each switch, and when the switch protection action is collected, the switch identifier is sent to the power grid self-healing terminal, wherein the switch identifier is the identifier of the switch that generates the protection action;

[0036] The power distribution room terminal is also used to control the opening of the switch to be opened according to the opening signal output by the power grid self-healing terminal, and to control the closing of the switch to be closed according to the closing signal output by the power grid self-healing terminal.

[0037] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation of the first aspect are implemented.

[0038] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0039] The embodiment of the present invention discloses a power grid self-healing method, which determines isolation, power transfer and grid connection schemes according to the location of the fault line. The method is clear and targeted, thus speeding up the self-healing process and reducing the power outage time. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 It is a schematic diagram of a power grid structure with a distributed power source provided in an embodiment of the present invention;

[0042] Figure 2is a flow chart of a power grid self-healing method provided by an embodiment of the present invention;

[0043] Figure 3 is a functional block diagram of a power grid self-healing device provided in an embodiment of the present invention;

[0044] Figure 4 is a functional block diagram of a power grid self-healing terminal provided in an embodiment of the present invention;

[0045] Figure 5 It is a functional block diagram of a power grid self-healing system provided in an embodiment of the present invention.

[0046] In the figure:

[0047] 110 First Ring Network;

[0048] 111 Ring network switch;

[0049] 120 Second Ring Network;

[0050] 130 Power distribution room;

[0051] 131 First power supply line;

[0052] 132 Second power supply line;

[0053] 133 first contact switch;

[0054] 134 Incoming switch;

[0055] 135 outlet switch;

[0056] 136 busbar section;

[0057] 141 first switch;

[0058] 142 second switch;

[0059] 143 Third switch;

[0060] 144 fourth switch;

[0061] 150 substations;

[0062] 160 Distributed power supply. DETAILED DESCRIPTION

[0063] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary details.

[0064] In order to make the purpose, technical solutions and advantages of the present invention more clear, a specific implementation method will be described below in conjunction with the accompanying drawings.

[0065] The following is a detailed description of an embodiment of the present invention. This example is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0066] Figure 1 The schematic diagram of the power grid structure with distributed power generation is shown.

[0067] In conjunction with the above-mentioned power grid self-healing method principle diagram, the implementation mode of the present invention is discussed in detail.

[0068] The embodiment of the present invention provides a power grid self-healing method, including: a first ring network 110, a second ring network 120, a distribution room 130 and a first switch 141; the first ring network 110 and the second ring network 120 are respectively used to connect to two different substations 150.

[0069] The distribution room 130 includes: a first power supply line 131, a second power supply line and a first connecting switch 133. The first power supply line 131 and the second power supply line are respectively connected to two ring networks. One end of the first connecting switch 133 is connected to the first power supply line 131, and the other end of the first connecting switch 133 is connected to the second power supply line.

[0070] The first switch 141 station includes: a first end, a second end and a third end, the first end is connected to the first power supply line 131, the second end is used to connect to the distributed power source 160, and the third end is connected to the second power supply line.

[0071] Specifically, the first ring network 110 and the second ring network 120 are two independently operated ring networks, each of which is powered by two substations 150 .

[0072] The function of the power distribution room 130 is to reduce the voltage of the electric energy from the ring network and then distribute it to the next level of lines. The ring network is the source of its electric energy. In the embodiment of the present invention, two power supply lines are provided in the power distribution room 130, and the two power supply lines are respectively connected to the two ring networks. Therefore, when one of the ring networks stops running, the corresponding power supply line connected thereto will be out of power. After taking other measures (usually troubleshooting and isolating), the electric energy of the other ring network can be transferred to the outage power supply line by closing the connecting switch, so as to achieve the purpose of ensuring the operation of the power supply line.

[0073] The switch station is the access end of the distributed power source 160, which includes common renewable energy power generation methods such as wind power generation, solar power generation, etc. that we are familiar with, and may also include distributed power source 160 forms such as energy storage power stations. Those skilled in the art should know that the above enumeration is only a specific implementation method provided for ease of understanding, and is not a limitation.

[0074] The distributed power source 160 is usually connected to a line of a lower voltage level, and in terms of design, if it is as close to the load as possible, the smaller the transmission loss is, the more beneficial it is for the application of the distributed power source 160.

[0075] One end of the switch station is connected to the distributed power source 160, and the other two ends are connected to two power supply lines respectively. By changing the connection relationship between the three ends, the distributed power source 160 can be used to supply power to any power supply line. For example, in one application scenario, the second end is connected to the third end to transmit electric energy to the second power supply line. In another application scenario, the second end is disconnected from the first end and the third end, so that the distributed power source 160 stops grid-connected power generation.

[0076] In one embodiment, the first switch 141 station includes: a first switch 141 and a second switch 142;

[0077] The first end of the first switch 141 is connected to the first power supply line 131 , and the second end of the second switch 142 is connected to the second power supply line; the second end of the first switch 141 and the first end of the second switch 142 are both used to connect to the distributed power source 160 .

[0078] Specifically, one implementation of the first switch station 141 is two switches for connecting to the distributed power source 160, one end of the two switches is used to connect to the distributed power source 160, and the other two ends are respectively connected to two power supply lines to achieve the purpose of controlling the connection or disconnection of the distributed power source 160 and the power supply line.

[0079] In one embodiment, the first power supply line 131 of the power distribution room 130 and the second power supply line of the power distribution room 130 both include: an incoming switch 134, an outgoing switch 135 and a bus section 136. The second end of the incoming switch 134 and the first end of the outgoing switch 135 are respectively connected to the bus section 136; the first end of the incoming switch 134 of the first power supply line 131 is used to access the first ring network 110, and the first end of the incoming switch 134 of the second power supply line is used to access the second ring network 120. One end of the first contact switch 133 is connected to the bus section 136 of the first power supply line 131, and the other end of the first contact switch 133 is connected to the bus of the second power supply line.

[0080] Specifically, each power supply line in the power distribution room 130 has two switches and a bus section 136. One end of each of the two switches is connected to the bus section 136, and one end of each of the two switches is connected to the ring network. Therefore, when one of the switches or the line connected to the switch fails (such as a grounding fault), the switch can be opened and the other switch can be closed to achieve the purpose of supplying power from the other switch. As can be seen from the above description, the power supply line with two switches has more ways to deal with line faults and its reliability is greatly improved.

[0081] In one implementation, a first end of the first switch 141 is connected to a first end of the incoming switch 134 of the first power supply line 131 , and a first end of the second switch 142 is connected to a first end of the incoming switch 134 of the second power supply line.

[0082] Specifically, based on the above embodiment, the switch connection mode of the switch station is set to be connected to the side of the incoming switch 134 close to the ring network, so that when the power supply line of the distribution room 130 fails (such as a ground fault), the switch of the distribution room 130 is actuated, and the purpose of disconnecting the distributed power source 160 from generating electricity is achieved at the same time, thereby ensuring the reliable operation of the distributed power source 160 and the safety of the power supply line in the distribution room 130.

[0083] In one embodiment, there are at least two power distribution rooms 130 .

[0084] The distribution rooms 130 are connected in series from head to tail, the first inlet end of the distribution room 130 at the head end and the first outlet end of the distribution room 130 at the tail end are respectively connected to the first ring network 110, the second inlet end of the distribution room 130 at the head end and the second outlet end of the distribution room 130 at the tail end are respectively connected to the second ring network 120, the first outlet end of each distribution room 130 is connected to the first inlet end of the distribution room 130 immediately behind it, and the second outlet end of each distribution room 130 is connected to the second inlet end of the distribution room 130 immediately behind it. Among them, the first inlet end is the first end of the inlet switch 134 of the first power supply line 131, the first outlet end is the second end of the outlet switch 135 of the first power supply line 131, the second inlet end is the first end of the inlet switch 134 of the second power supply line, and the second outlet end is the second end of the outlet switch 135 of the second power supply line.

[0085] In one embodiment, the first switch 141 station further includes: a third switch 143 and a fourth switch 144. The second end of the third switch 143 and the first end of the fourth switch 144 are both used to connect to the distributed power source 160; the first end of the third switch 143 is connected to the second end of the outgoing switch 135 of the first power supply line 131, and the second end of the fourth switch 144 is connected to the second end of the outgoing switch 135 of the second power supply line.

[0086] Specifically, when multiple distribution rooms 130 are used, the multiple distribution rooms 130 are connected to the ring network in an end-to-end manner, and the two distribution rooms 130 at the head end and the tail end of the multiple distribution rooms 130 are both connected to the ring network, thereby forming a ring power supply structure. Once the power supply line of one of the distribution rooms 130 fails, the switch of another distribution room 130 can be used to transfer power.

[0087] In contrast, the first switch station 141 is provided with two additional switches, which are respectively used to connect the end of the outgoing switch 135 away from the bus section 136. Therefore, when reverse power supply is performed through the outgoing switch 135, switching can be performed through the additional two switches to achieve the purpose of continuous grid-connected power generation.

[0088] based on Figure 1 The grid structure shown is Figure 2 A flowchart of a power grid self-healing method provided by a first aspect of an embodiment of the present invention is shown, and is described in detail as follows:

[0089] In step 201, the identifier of the faulty line is obtained.

[0090] In some embodiments, step 201 includes:

[0091] A switch identifier is obtained, wherein the switch identifier is an identifier of a switch that generates a protection action.

[0092] The identifier of the faulty line is determined according to the switch identifier.

[0093] In some implementations, determining the identifier of the faulty line according to the switch identifier includes:

[0094] If the switch identifier is the identifier of the incoming switch, the fault line is a bus section, and the identifier of the bus section is obtained as the identifier of the fault line, wherein the bus section is the bus section connected to the incoming switch;

[0095] If the switch identifier is an identifier of a ring network switch, the faulty line is an incoming line, and the identifier of the incoming line is obtained as the identifier of the faulty line, wherein the incoming line is an incoming line connected to the ring network switch;

[0096] If the switch identifier is an identifier of a grid-connected switch, the faulty line is a grid-connected line, and the identifier of the grid-connected line is obtained as the identifier of the faulty line, wherein the grid-connected line is a line connected to the grid-connected switch.

[0097] Exemplarily, a method for identifying a faulty line is to determine it based on an identification of a protection action switch.

[0098] Depend on Figure 1 It can be seen that the lines related to the distribution room include incoming lines, outgoing lines, busbars and lines connecting distributed power sources to the incoming lines. Switches are installed between these lines. When the switch protection is activated, the faulty line can be determined by the switch identification.

[0099] When the incoming switch 134 is protected, since the bus section 136 is connected to it, it can be determined that a fault has occurred in the bus section.

[0100] When the ring network switch 111 is in protective action, since the first power supply line 131 is connected to it, it can be determined that a fault has occurred in the incoming line.

[0101] When the first switch 141 is in protective action, since the grid-connected line is connected to it, it can be determined that a fault has occurred in the grid-connected line.

[0102] Those skilled in the art should understand that the above description is only an example provided for ease of understanding and is not limiting.

[0103] In step 202, a switch to be opened and a switch to be closed are determined according to the identification of the fault line, wherein the switch to be opened is used to isolate the fault line, and the switch to be closed is used to connect the power outage area and the target distributed power source to the power transfer line, the power outage area is the power outage area affected by the fault line, the target distributed power source is the distributed power source connected to the grid with the fault line, and the power transfer line is the line that transfers power to the power outage area.

[0104] In some implementations, step 202 includes:

[0105] If the fault line is a bus section, the switch to be opened includes: a switch connecting the target distributed power source and the fault line and an outgoing switch connected to the bus section, and the switch to be closed includes: a second grid-connected switch and a connecting switch, wherein the second grid-connected switch is a switch connecting the target distributed power source and the transfer power supply line, and the connecting switch is a switch connecting the transfer power supply line.

[0106] If the faulty line is an incoming line, the switch to be opened includes: a switch connecting the incoming line and a ring network, wherein the ring network is a ring network connected to the incoming line, and the switch to be closed includes: each outgoing line switch on the same power supply line as the faulty line.

[0107] If the fault line is a grid-connected line, the switch to be opened includes: an incoming line switch and a switch connecting the incoming line and the ring network, wherein the switch to be closed includes: a third grid-connected switch and each outgoing line switch on the same power supply line as the incoming line, wherein the third grid-connected switch is a switch connecting the target distributed power source and the outgoing line.

[0108] In some implementations, if the faulty line is a busbar section, the transfer power supply line is a normal power supply line in the same distribution room as the faulty line.

[0109] In step 203, the switch to be opened is opened.

[0110] In step 204, the switch to be closed is closed.

[0111] For example, for Figure 1 In the grid structure shown in , if the fault line is bus section 136, we can see that at this time, it is obvious that the load powered by bus section 136 cannot obtain power supply. In addition, due to the fault of bus section 136, the distributed power source 160 cannot be normally connected to the grid for power generation. Therefore, the bus 136 should be isolated and repaired. During isolation, the first switch 141 should be opened to disconnect the distributed power source from the bus 136, and the ring network switch 111 should be opened to disconnect the bus 136 from the first ring network 110. At this time, the bus 136 is in maintenance conditions and can be repaired. For the distributed power source 160, the distributed power source should be connected to the second power supply line 132 for power generation by closing the second switch 142. For power restoration, the electric energy of the second power supply line 132 should be transferred to the power outage area by closing the first contact switch 133.

[0112] If the faulty line is the first power supply line 131, we can see that although the first power supply line 131 is faulty, the power supply of the first ring network can be fed back to the bus section 136 through the outgoing switch 135. Before performing the operation, the incoming switch 134 should be opened. After opening, the outgoing switch 135 on the first power supply line 131 in the power distribution room on the right side of the figure can be closed.

[0113] If the faulty line is a grid-connected line, i.e., the line between the first switch 141 and the incoming switch 134 in the figure, this section of the line should be repaired, and the connection between this section of the line and the power supply line should be disconnected before the repair. Therefore, the bus section 136 and the ring network switch 111 should be opened. Then close the outgoing switch 135 on the first power supply line 131 in the power distribution room on the right side of the figure to realize the reverse transmission of the first ring network 110 back to the bus section 136, and finally close 143 to realize grid-connected power generation.

[0114] In some implementations, in step 204, if the faulty line is a bus section, closing the switch to be closed includes:

[0115] The remaining capacity of the power transfer line and the load of the faulty line are obtained, wherein the load of the faulty line is the load of the faulty line before the fault occurs.

[0116] If the difference between the remaining capacity of the power transfer line and the load of the faulty line is greater than a threshold, the switch to be closed is closed.

[0117] If the difference between the remaining capacity of the transfer power supply line and the load of the fault line is less than or equal to the threshold, then the switch to be closed will be closed when the difference between the remaining capacity of the transfer power supply line and the load of the fault line is greater than the threshold.

[0118] For example, it is important to note that when a busbar section fails, power is transferred through other power supply lines. The capacity of the power transfer line should be considered. Figure 1 As shown in , when the bus section 136 fails, necessary isolation should be taken and the electric energy of the second power supply line 132 should be transferred to the power outage area by closing the first connecting switch 133. This operation may cause the load of the second power supply line 132 to increase to a level that exceeds its bearing capacity. Therefore, in this case, the relationship between the remaining capacity and the load of the power outage area should be considered. The transfer operation can only be performed when the remaining capacity is sufficient.

[0119] The embodiment of the present invention provides a self-healing method for a power grid structure with distributed power sources. The method determines isolation, power transfer and grid connection plans according to the location of the fault line. The method is clear and targeted, thus speeding up the self-healing process and reducing the power outage time.

[0120] Figure 3 It is a functional block diagram of a power grid self-healing device provided in an embodiment of the present invention.

[0121] A second aspect of an embodiment of the present invention provides a power grid self-healing device, which includes: a fault line identification acquisition module 301, an opening and closing judgment module 302, an opening signal output module 303 and a closing signal output module 304.

[0122] The fault line identification acquisition module 301 is used to acquire the identification of the fault line.

[0123] The opening and closing judgment module 302 is used to determine the switch to be opened and the switch to be closed according to the identification of the fault line, wherein the switch to be opened is used to isolate the fault line, and the switch to be closed is used to connect the power outage area and the target distributed power source to the power supply transfer line, the power outage area is the power outage area affected by the fault line, the target distributed power source is the distributed power source connected to the grid with the fault line, and the power supply transfer line is the line that transfers power to the power outage area.

[0124] The opening signal output module 303 is used to output a signal indicating that the switch to be opened is opened.

[0125] The closing signal output module 304 is used to output a signal indicating that the switch to be closed is closed.

[0126] Figure 4 is a functional block diagram of a terminal provided by an embodiment of the present invention. Figure 4 As shown, the terminal 4 of 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, the steps in the above-mentioned power grid self-healing methods and embodiments are implemented, for example Figure 2 Steps 201 to 204 are shown.

[0127] Exemplarily, the computer program 402 may be divided into one or more modules / units, and the one or more modules / units are stored in the memory 401 and executed by the processor 400 to implement the present invention.

[0128] The terminal 4 may be a computing device such as a desktop computer, a notebook, a PDA, or a 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 appreciate that Figure 4 It is only an example of terminal 4 and does not constitute a limitation on terminal 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal may also include input and output devices, network access devices, buses, etc.

[0129] The processor 400 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), 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, etc.

[0130] The memory 401 may be an internal storage unit of the terminal 4, such as a hard disk or memory of the terminal 4. The memory 401 may also be an external storage device of the terminal 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal 4. Further, the memory 401 may also include both an internal storage unit and an external storage device 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 may also be used to temporarily store data that has been output or is to be output.

[0131] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned function allocation can be completed by 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 implementation method can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method implementation method, which will not be repeated here.

[0132] In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0134] In the embodiments provided by the present 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 only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0135] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0136] In addition, each functional unit in each embodiment of the present invention 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.

[0137] If the integrated module / 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 present invention implements all or part of the processes in the above-mentioned implementation method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various power grid self-healing methods and power grid self-healing device implementation methods can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0138] Figure 5 A functional block diagram of a power grid self-healing system is provided. The system includes a power grid self-healing terminal 4, and also includes:

[0139] The power distribution room terminal 501 is signal-connected to the power grid self-healing terminal 4 .

[0140] The power distribution room terminal 501 is used to collect the actions of each switch, and send the switch identifier to the power grid self-healing terminal 4 when the switch protection action is collected, wherein the switch identifier is the identifier of the switch that generates the protection action.

[0141] The power distribution room terminal 501 is also used to control the switch to be opened to be opened according to the opening signal output by the power grid self-healing terminal 4, and to control the switch to be closed to be closed according to the closing signal output by the power grid self-healing terminal 4.

[0142] Exemplarily, the distribution room terminal 501 is a monitoring terminal that monitors the load of the lines in the distribution room and the status of switches. In some embodiments, the monitoring terminal also has the function of recording the voltage and power waveform of the lines. When some line outputs are abnormal, the monitoring terminal will control the corresponding switch action, or receive external signals to control the action of the corresponding switch.

[0143] The power grid self-healing terminal 4 is connected to multiple power distribution room terminals 501 by signal. In one implementation, the power grid self-healing terminal 4 and the power distribution room terminal 501 are both connected to the 5G network and communicate through the network. When the switch protection is activated, the power distribution room terminal 501 sends the identification of the activated switch to the power grid self-healing terminal 4. Since the power grid self-healing terminal 4 receives signals from each power distribution room terminal 501, it can comprehensively judge the status of the power supply line and determine the actions that each power distribution room should perform.

[0144] After the self-healing terminal 4 outputs the opening signal and the closing signal through the method in the embodiment of the present invention, the signal is sent to the corresponding distribution room terminal 501, and the distribution room terminal 501 controls the corresponding switch and performs the corresponding action to realize the self-healing of the power grid.

[0145] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A power grid self-healing method, characterized in that: Applied to a power grid with distributed power sources, the method comprises: Obtain the identification of the faulty line; Determine the switch to be opened and the switch to be closed according to the identification of the fault line, wherein the switch to be opened is used to isolate the fault line, and the switch to be closed is used to connect the power outage area and the target distributed power source to the power transfer line, the power outage area is the power outage area affected by the fault line, the target distributed power source is the distributed power source connected to the fault line, and the power transfer line is the line that transfers power to the power outage area; Opening the switch to be opened; Closing the switch to be closed; in, The step of determining a switch to be opened and a switch to be closed according to the fault line comprises: If the fault line is a bus section, the switch to be opened includes: a switch connecting the target distributed power source and the fault line and an outgoing switch connected to the bus section, and the switch to be closed includes: a second grid-connected switch and a tie switch, wherein the second grid-connected switch is a switch connecting the target distributed power source and the transfer power supply line, and the tie switch is a switch connecting the transfer power supply line; If the faulty line is an incoming line, the switch to be opened includes: a switch connecting the incoming line and a ring network, wherein the ring network is a ring network connected to the incoming line, and the switch to be closed includes: each outgoing line switch on the same power supply line as the faulty line; If the fault line is a grid-connected line, the switch to be opened includes: an incoming line switch and a switch connecting the incoming line and the ring network, wherein the switch to be closed includes: a third grid-connected switch and each outgoing line switch on the same power supply line as the incoming line, wherein the third grid-connected switch is a switch connecting the target distributed power source and the outgoing line.

2. The power grid self-healing method according to claim 1, characterized in that: The obtaining of the identifier of the faulty line includes: Obtaining a switch identifier, wherein the switch identifier is an identifier of a switch that generates a protection action; The identifier of the faulty line is determined according to the switch identifier.

3. The power grid self-healing method according to claim 2, characterized in that: The step of determining the identifier of the faulty line according to the switch identifier comprises: If the switch identifier is the identifier of the incoming switch, the fault line is a bus section, and the identifier of the bus section is obtained as the identifier of the fault line, wherein the bus section is the bus section connected to the incoming switch; If the switch identifier is an identifier of a ring network switch, the faulty line is an incoming line, and the identifier of the incoming line is obtained as the identifier of the faulty line, wherein the incoming line is an incoming line connected to the ring network switch; If the switch identifier is an identifier of a grid-connected switch, the faulty line is a grid-connected line, and the identifier of the grid-connected line is obtained as the identifier of the faulty line, wherein the grid-connected line is a line connected to the grid-connected switch.

4. The power grid self-healing method according to claim 1, characterized in that: If the faulty line is a busbar section, the transfer power supply line is a normal power supply line in the same distribution room as the faulty line.

5. The power grid self-healing method according to claim 1 or 4, characterized in that: If the fault line is a busbar section, closing the switch to be closed includes: Obtaining the remaining capacity of the power transfer line and the load of the faulty line, wherein the load of the faulty line is the load of the faulty line before the fault occurs; If the difference between the remaining capacity of the power transfer line and the load of the faulty line is greater than a threshold, closing the switch to be closed; If the difference between the remaining capacity of the transfer power supply line and the load of the fault line is less than or equal to the threshold, then the switch to be closed will be closed when the difference between the remaining capacity of the transfer power supply line and the load of the fault line is greater than the threshold.

6. A power grid self-healing device, characterized in that: Used to implement the power grid self-healing method according to any one of claims 1 to 5, the power grid self-healing device comprises: A fault line identification acquisition module, used to acquire the identification of the fault line; An opening and closing judgment module is used to determine the switch to be opened and the switch to be closed according to the identification of the fault line, wherein the switch to be opened is used to isolate the fault line, and the switch to be closed is used to connect the power outage area and the target distributed power source to the power transfer line, the power outage area is the power outage area affected by the fault line, the target distributed power source is the distributed power source connected to the fault line, and the power transfer line is the line that transfers power to the power outage area; A trip signal output module is used to output a signal indicating that the switch to be tripped is tripped; and The closing signal output module is used to output a signal indicating that the switch to be closed is closed.

7. A power grid self-healing 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, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A power grid self-healing system, characterized in that: include: The power grid self-healing terminal according to claim 7, further comprising: a power distribution room terminal; the power distribution room terminal is signal-connected to the power grid self-healing terminal; The power distribution room terminal is used to collect the actions of each switch, and when the switch protection action is collected, the switch identifier is sent to the power grid self-healing terminal, wherein the switch identifier is the identifier of the switch that generates the protection action; The power distribution room terminal is also used to control the switch to be opened to be opened according to the opening signal output by the power grid self-healing terminal, and to control the switch to be closed to be closed according to the closing signal output by the power grid self-healing terminal.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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