Anti-islanding protection method and device based on transformer area intelligent terminal and electronic equipment

Abstract

The invention provides an anti-islanding protection method and device based on a transformer area intelligent terminal and electronic equipment, and the method comprises the steps: obtaining a to-be-processed distributed photovoltaic power distribution system which comprises a plurality of power distribution transformers; based on the conduction condition of the adjacent distribution transformers, the distributed photovoltaic power distribution system to be processed is partitioned to obtain a plurality of electrical island areas, and the adjacent distribution transformers in each electrical island area are in a conduction state; for any electrical island area, determining whether the electrical island area is in a passive island state or not according to the power supply operation state of the electrical island area, the electrical quantity value of the electrical equipment corresponding to the electrical island area acquired by the transformer area intelligent distribution transformer fusion terminal, and the electrical quantity value uploaded by the photovoltaic inverter corresponding to the electrical island area; and under the condition that the electrical island area is in the passive island state, performing network disconnection operation on the electrical island area. And the stability and the safety of the distributed photovoltaic power distribution system are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power system distribution network, and in particular to an anti-islanding protection method, device and electronic equipment based on a smart terminal in an area. Background Art

[0002] Distributed photovoltaic power generation, as an emerging and decentralized way of energy utilization, is gradually becoming an important part of the energy field. This technology mainly relies on photovoltaic accessories, and realizes the green and renewable utilization of energy by efficiently converting absorbed solar energy resources into electrical energy. Especially today when the urbanization process is accelerating, distributed photovoltaic power generation has been widely used in cities due to its flexibility and strong adaptability.

[0003] However, as the proportion of distributed photovoltaic power generation connected to the grid continues to increase, it has also brought a series of new challenges. Among them, the "island effect" problem is particularly prominent. The island effect refers to the fact that in a distributed photovoltaic power generation system, when the power grid is out of power due to a fault or other reasons, the photovoltaic power generation system may continue to supply power to the outage area, forming an electric island independent of the main power grid. Although this phenomenon can maintain the power supply in the outage area to a certain extent, it may also have a serious impact on the stability and safety of the system. For example, the island effect may cause abnormal fluctuations in voltage and frequency, affecting the normal operation of power equipment; at the same time, when the power grid resumes power supply, if the island area fails to disconnect from the main power grid in time, it may also cause reclosing failure, further aggravating the scope of the power grid failure.

[0004] Therefore, how to solve the islanding effect problem in distributed photovoltaic distribution systems and ensure the stability and security of the power grid has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present invention provides an anti-islanding protection method, device and electronic equipment based on intelligent terminals in a substation area, which are used to solve the islanding effect problem in a distributed photovoltaic power distribution system in the prior art and achieve the stability and safety of the distributed photovoltaic power distribution system.

[0006] The present invention provides an anti-islanding protection method based on an intelligent terminal in a substation, the method comprising: obtaining a distributed photovoltaic distribution system to be processed, wherein the distributed photovoltaic distribution system to be processed comprises a plurality of distribution transformers; based on the conduction conditions of adjacent distribution transformers, zoning the distributed photovoltaic distribution system to be processed to obtain a plurality of electrical island areas, wherein adjacent distribution transformers in each electrical island area are in a conduction state; for any electrical island area, determining whether the electrical island area is in a passive islanding state according to the power supply operation state of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution transformer fusion terminal in the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area; and when the electrical island area is in a passive islanding state, disconnecting the electrical island area from the network.

[0007] According to an anti-islanding protection method based on a substation intelligent terminal provided by the present invention, the method determines whether the electrical island area is in a passive islanding state according to the power supply operation state of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the substation intelligent distribution and transformation fusion terminal, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area. Specifically, it includes: when the power supply operation state of the electrical island area is a non-powered operation state, based on the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the substation intelligent distribution and transformation fusion terminal, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined whether the distribution transformer in the electrical island area has a voltage value; when the distribution transformer in the electrical island area has a voltage value, it is determined that the electrical island area is in a passive islanding state; when the distribution transformer in the electrical island area does not have a voltage value, it is determined that the electrical island area is not in a passive islanding state.

[0008] According to an anti-islanding protection method based on a substation intelligent terminal provided by the present invention, the power supply operation status of the electrical island area is determined, and the following method is adopted: the switch closing state of the power supply side switch corresponding to the electrical island area is obtained; if the switch closing state of the power supply side switch corresponding to the electrical island area is in an unclosed state, the power supply operation status of the electrical island area is determined to be a non-powered operation state.

[0009] According to an anti-islanding protection method based on a substation intelligent terminal provided by the present invention, the voltage value of the distribution transformer in the electrical island area is determined, and the following method is adopted: when the electrical value of the electrical equipment corresponding to the electrical island area collected by the substation intelligent distribution and transformation fusion terminal is greater than the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, the distribution transformer in the electrical island area is determined to have a voltage value.

[0010] According to an anti-islanding protection method based on a substation intelligent terminal provided by the present invention, when the electrical island area is in a passive islanding state, the electrical island area is disconnected from the grid, specifically comprising: when the electrical island area is in a passive islanding state, the grid-connected line switch of the electrical island area is disconnected within a first time period; if the grid-connected line switch of the electrical island area is not disconnected within the first time period, the main distribution transformer switch of the distributed photovoltaic distribution system to be processed is disconnected within a second time period.

[0011] According to an anti-islanding protection method based on intelligent terminals in a substation provided by the present invention, before the distributed photovoltaic distribution system to be processed is partitioned based on the conduction status of adjacent distribution transformers to obtain multiple electrical island areas, the method also includes: based on the distributed photovoltaic distribution system to be processed, constructing a distribution network connection diagram corresponding to the distributed photovoltaic distribution system to be processed, wherein the distribution network connection diagram is an undirected graph composed of multiple nodes and multiple connection edges, the nodes correspond to the distribution transformers, and the connection edges correspond to the feeders in the distributed photovoltaic distribution system to be processed; for the adjacent distribution transformers, obtaining the closing status of the connecting switch on the feeder connecting the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed; the distributed photovoltaic distribution system to be processed is partitioned based on the conduction status of the adjacent distribution transformers to obtain multiple electrical island areas. The island area specifically includes: when the connecting switch on the feeder used to connect the adjacent distribution transformers is in a closed state, determining that the adjacent distribution transformers are in a conducting state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area; repeatedly executing the steps of obtaining the closing status of the connecting switch on the feeder used to connect the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed for the adjacent distribution transformers, to when the connecting switch on the feeder used to connect the adjacent distribution transformers is in a closed state, determining that the adjacent distribution transformers are in a conducting state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area, until the merging processing of all the distribution transformers is completed, so as to realize the partitioning processing of the distributed photovoltaic distribution system to be processed and obtain multiple electrical island areas.

[0012] According to a method for anti-islanding protection based on intelligent terminals in a substation provided by the present invention, the method also includes: when the electrical island area is pre-set as a black start area, if it is determined that the electrical island area is in a passive islanding state, black start processing of the electrical island area is implemented based on a grid-connected inverter and an energy storage device corresponding to the electrical island area.

[0013] According to a method for preventing islanding based on intelligent terminals in a substation provided by the present invention, the method for preventing islanding based on intelligent terminals in a substation is applied to the cloud of the Internet of Things; for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal in the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, determining whether the electrical island area is in a passive island state, specifically includes: based on the cloud of the Internet of Things, for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal in the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, determining whether the electrical island area is in a passive island state; when the electrical island area is in a passive island state, disconnecting the electrical island area from the network, specifically includes: when the electrical island area is in a passive island state, initiating a disconnection operation instruction to the electrical island area based on the cloud of the Internet of Things to disconnect the electrical island area.

[0014] The present invention also provides an anti-islanding protection device based on a substation intelligent terminal, the device comprising: an acquisition module, used to acquire a distributed photovoltaic distribution system to be processed, wherein the distributed photovoltaic distribution system to be processed comprises a plurality of distribution transformers; a processing module, used to partition the distributed photovoltaic distribution system to be processed based on the conduction conditions of adjacent distribution transformers to obtain a plurality of electrical island areas, wherein adjacent distribution transformers in each electrical island area are in a conduction state; an analysis module, used to determine, for any of the electrical island areas, whether the electrical island area is in a passive islanding state according to the power supply operation state of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area obtained by the substation intelligent distribution and transformation fusion terminal, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area; a network disconnection operation module, used to perform a network disconnection operation on the electrical island area when the electrical island area is in a passive islanding state.

[0015] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements any of the above-mentioned anti-islanding protection methods based on intelligent terminals in a substation area.

[0016] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the anti-islanding protection method based on intelligent terminals in a substation area as described above is implemented.

[0017] The present invention also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned anti-islanding protection methods based on intelligent terminals in a substation.

[0018] The present invention provides an anti-islanding protection method, device and electronic device based on an intelligent terminal in an area, and obtains a distributed photovoltaic distribution system to be processed, wherein the distributed photovoltaic distribution system to be processed includes multiple distribution transformers; based on the conduction conditions of adjacent distribution transformers, the distributed photovoltaic distribution system to be processed is partitioned to obtain multiple electrical island areas; for any electrical island area, according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution transformer fusion terminal in the area, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined whether the electrical island area is in a passive islanding state; when the electrical island area is in a passive islanding state, the electrical island area is disconnected from the network, so that it can be accurately judged whether there is an islanding effect in the electrical island area, and when there is an islanding effect in the electrical island area, the island is quickly disconnected, thereby improving the stability and safety of the distributed photovoltaic distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of the anti-islanding protection method based on the intelligent terminal in the substation area provided by the present invention.

[0021] Figure 2 It is a flow chart provided by the present invention for determining whether an electrical island area is in a passive island state based on the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area.

[0022] Figure 3 It is a flow chart of disconnecting the electrical island area from the network when the electrical island area is in a passive island state, as provided by the present invention.

[0023] Figure 4 The present invention provides a flow chart for performing zoning processing on a distributed photovoltaic distribution system to be processed based on the conduction conditions of adjacent distribution transformers to obtain multiple electrical island areas.

[0024] Figure 5 It is a structural schematic diagram of the anti-islanding protection device based on the intelligent terminal in the substation provided by the present invention.

[0025] Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The anti-islanding protection method based on the intelligent terminal in the substation provided by the present invention is used to solve a problem called "islanding effect" in the distributed photovoltaic power generation system (corresponding to the distributed photovoltaic power distribution system to be processed in the previous text), which may affect the stability and safety of the system. When photovoltaic power generation stops running due to a fault, the photovoltaic grid-connected power generation system installed at each user end fails to detect the power outage in time and disconnects itself from the municipal power network. This photovoltaic grid-connected system supplies power to the surrounding loads to form an island, and the power company cannot grasp the status of its power supply.

[0028] The anti-islanding protection method based on the intelligent terminal in the substation provided by the present invention determines whether there is an island by real-time monitoring of the electrical data of the substation and controls the substation to quickly cut off the island, thereby improving the stability of the power system, establishing a protection logic algorithm and a protection control strategy, and avoiding grid losses caused by missed judgment and misjudgment of the islanding effect.

[0029] Figure 1 It is a flow chart of the anti-islanding protection method based on the intelligent terminal in the substation area provided by the present invention.

[0030] The following will be combined Figure 1 The process of the anti-islanding protection method based on the intelligent terminal in the substation provided by the present invention is explained.

[0031] In an exemplary embodiment of the present invention, Figure 1 It can be known that the anti-islanding protection method based on the intelligent terminal in the substation area may include steps 110 to 140, and each step will be introduced below.

[0032] In step 110, a distributed photovoltaic power distribution system to be processed is obtained, wherein the distributed photovoltaic power distribution system to be processed includes a plurality of distribution transformers.

[0033] In step 120, based on the conduction status of adjacent distribution transformers, the distributed photovoltaic distribution system to be processed is partitioned to obtain multiple electrical island areas, wherein adjacent distribution transformers in each electrical island area are in a conduction state.

[0034] In one embodiment, a distributed photovoltaic power distribution system to be processed may be obtained, wherein the distributed photovoltaic power distribution system to be processed may include a plurality of distribution transformers. In another example, the distributed photovoltaic power distribution system to be processed may also include a feeder and a tie switch. The tie switch is located on the feeder, and if the tie switch is in a closed state, the distribution transformers connected through the feeder are in a conducting state.

[0035] In another embodiment, the distributed photovoltaic distribution system to be processed can be partitioned according to the conduction conditions of adjacent distribution transformers, so as to obtain multiple electrical island areas, wherein the adjacent distribution transformers in each electrical island area are in a conducting state. It should be noted that the conduction conditions of adjacent distribution transformers may include two states: conducting and non-conducting. Among them, adjacent distribution transformers in a conducting state can be divided into the same electrical island area, and adjacent distribution transformers in a non-conducting state can be divided into different electrical island areas.

[0036] In step 130, for any electrical island area, it is determined whether the electrical island area is in a passive island state based on the power supply operation status of the electrical island area, the electrical values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area.

[0037] In step 140, when the electrical island area is in a passive island state, a network disconnection operation is performed on the electrical island area.

[0038] In another embodiment, for any of the electrical island areas in the distributed photovoltaic power distribution system to be processed, it is possible to determine whether the electrical island area is in a passive island state based on the power supply operation status of the electrical island area (including both operation and power outage states), the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area. In other words, in this embodiment, the redundant information will be combined to collaboratively determine whether the partition (corresponding to the electrical island area) is in a passive island, that is, the power supply side (corresponding to the power supply operation status of the electrical island area) and the user side (the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area) will be combined to collaboratively determine whether the electrical island area is in a passive island state. By comparing information from different data sources, the accuracy of the judgment can be increased.

[0039] In another embodiment, when it is determined that the electrical island area is in a passive island state, the electrical island area can be disconnected from the grid, thereby quickly disconnecting the island and improving the stability of the power system.

[0040] The anti-islanding protection method based on the intelligent terminal in the substation provided by the present invention determines whether there is an island by real-time monitoring of the electrical data of the substation and controls the substation to quickly cut off the island, thereby improving the stability of the power system, establishing a protection logic algorithm and a protection control strategy, and avoiding grid losses caused by missed judgment and misjudgment of the islanding effect.

[0041] Figure 2 It is a flow chart provided by the present invention for determining whether an electrical island area is in a passive island state based on the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area.

[0042] The following will be combined Figure 2 The present invention describes a process for determining whether an electrical island area is in a passive island state based on the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area.

[0043] In an exemplary embodiment of the present invention, Figure 2It can be seen that according to the power supply operation status of the electrical island area, the electrical values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, determining whether the electrical island area is in a passive island state can include steps 210 to 230, and each step will be introduced below.

[0044] In step 210, when the power supply operation state of the electrical island area is the non-power supply operation state, based on the electrical values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined whether the distribution transformer in the electrical island area has a voltage value.

[0045] In step 220, when the distribution transformers in the electrical island area have voltage values, it is determined that the electrical island area is in a passive island state.

[0046] In step 230, when the distribution transformers in the electrical island area do not have a voltage value, it is determined that the electrical island area is not in a passive island state.

[0047] In one embodiment, when the power supply operation state of the electrical island area is the non-power supply operation state, that is, when the electrical island area should be in a power outage, it can be further determined whether the distribution transformer in the electrical island area has a voltage value by combining the electrical values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation and the electrical values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area.

[0048] In yet another embodiment, when the electrical island area should be in a power outage, if the distribution transformer in the electrical island area has a voltage value, it can be determined that the electrical island area is in a passive island state.

[0049] In yet another embodiment, when the electrical island area should be in a power outage, if the distribution transformer in the electrical island area does not have a voltage value, it can be determined that the electrical island area is not in a passive island state.

[0050] In the aforementioned embodiment, based on comparing information from different data sources, including power supply side information and user side information, the accuracy of determining whether the electrical island area is in a passive island state can be increased.

[0051] In another exemplary embodiment of the present invention, continuing with the above Figure 2 The above embodiment is used as an example for explanation, wherein determining the power supply operation status of the electrical island area can be implemented in the following manner: Obtaining a switch closing state of a power supply side switch corresponding to an electrical island region; If the switch closing state of the power supply side switch corresponding to the electrical island area is in the unclosed state, it is determined that the power supply operation state of the electrical island area is the non-power supply operation state.

[0052] In one embodiment, since the interconnection switch in the distributed photovoltaic distribution system to be processed may also include the real-time status of the power side switch which has been uploaded to the distribution management system (Distribution Management System), the real-time status of the interconnection switch is queried through the DMS, and the real-time status of some interconnection switches that are not connected to the network can be obtained through maintenance records or on-site verification. In the application process, the switch closing state of the power side switch corresponding to the electrical island area can be obtained through the DMS query. If the power side switch is in the open state, it indicates that the area should be powered off; if it is in the closed state, it indicates that the area should be running, that is, when the switch closing state of the power side switch corresponding to the electrical island area is in the unclosed state, the power supply operation state of the electrical island area is determined to be the non-power supply operation state (corresponding to the power outage state in the previous text); when the switch closing state of the power side switch corresponding to the electrical island area is in the closed state, the power supply operation state of the electrical island area is determined to be the power supply operation state (corresponding to the operation state in the previous text).

[0053] In another exemplary embodiment of the present invention, continuing with the above Figure 2 The above embodiment is used as an example for explanation, wherein determining the voltage value of the distribution transformer in the electrical island area can be implemented in the following manner: When the electrical quantity value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation is greater than the electrical quantity value uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined that the distribution transformer in the electrical island area has a voltage value.

[0054] In one embodiment, if the electrical quantity value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation is greater than the electrical quantity value uploaded by the photovoltaic inverter corresponding to the electrical island area, it means that there is a energized distribution transformer in the electrical island area, that is, it is determined that the distribution transformer in the electrical island area has a voltage value, thereby laying the foundation for further accurate judgment of whether the electrical island area is in a passive island state.

[0055] Figure 3 It is a flow chart of disconnecting the electrical island area from the network when the electrical island area is in a passive island state, as provided by the present invention.

[0056] In another exemplary embodiment of the present invention, Figure 3It can be seen that when the electrical island area is in a passive island state, disconnecting the electrical island area from the network may include step 310 and step 320, and each step will be described below.

[0057] In step 310, when the electrical island area is in a passive island state, the grid-connected line switches of the electrical island area are disconnected within a first time period.

[0058] In step 320, if the grid-connected line switch in the electrical island area has not been disconnected in the first time period, the main distribution transformer switch of the distributed photovoltaic power distribution system to be processed is disconnected in the second time period.

[0059] In one embodiment, the distribution network anti-islanding relay protection strategy uses the I and II time limits (corresponding to the first time period and the second time period, respectively) for coordination. During the application process, when the electrical island area is in a passive island state, the grid-connected line switch in the electrical island area can be disconnected within the first time period; if the grid-connected line switch refuses to move and the island still exists, that is, the grid-connected line switch in the electrical island area has not been disconnected within the first time period, then the main distribution transformer switch of the distributed photovoltaic distribution system to be processed can be disconnected within the second time period, that is, the switches on both sides of the main transformer connected to the distributed power source grid are tripped, so that the control console area can quickly cut off the island, improving the stability of the power system.

[0060] Figure 4 The present invention provides a flow chart for performing zoning processing on a distributed photovoltaic distribution system to be processed based on the conduction conditions of adjacent distribution transformers to obtain multiple electrical island areas.

[0061] The following will be combined Figure 4 The process of partitioning a distributed photovoltaic distribution system to be processed based on the conduction conditions of adjacent distribution transformers to obtain multiple electrical island areas provided by the present invention is described.

[0062] In an exemplary embodiment of the present invention, Figure 4 It can be seen that based on the conduction conditions of adjacent distribution transformers, partitioning the distributed photovoltaic distribution system to be processed to obtain multiple electrical island areas may include steps 410 to 440, and each step will be introduced below.

[0063] In step 410, based on the distributed photovoltaic distribution system to be processed, a distribution network connection graph corresponding to the distributed photovoltaic distribution system to be processed is constructed, wherein the distribution network connection graph is an undirected graph consisting of multiple nodes and multiple connection edges, the nodes correspond to the distribution transformers, and the connection edges correspond to the feeders in the distributed photovoltaic distribution system to be processed.

[0064] In one embodiment, a distribution network connection diagram corresponding to the distributed photovoltaic distribution system to be processed can be constructed based on the distributed photovoltaic distribution system to be processed, wherein the distribution network connection diagram is an undirected graph consisting of multiple nodes and multiple connection edges, the nodes correspond to the distribution transformers, and the connection edges correspond to the feeders in the distributed photovoltaic distribution system to be processed. In one example, the distribution network connection diagram can be defined as Points and An undirected graph consisting of edges (corresponding to connecting edges).

[0065] In step 420, for the adjacent distribution transformer, the closing status of the tie switch on the feeder line connecting the adjacent distribution transformer in the distributed photovoltaic power distribution system to be processed is obtained.

[0066] In step 430, when the tie switch on the feeder connecting the adjacent distribution transformers is in a closed state, it is determined that the adjacent distribution transformers are in a conducting state, the adjacent distribution transformers are merged, and the merged adjacent distribution transformers are merged into the same electrical island area.

[0067] In another embodiment, for adjacent distribution transformers, the closing status of the interconnecting switches on the feeders used to connect the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed can be obtained; when the interconnecting switches on the feeders used to connect the adjacent distribution transformers are in a closed state, it can be determined that the adjacent distribution transformers are in a conducting state, the adjacent distribution transformers can be merged, and the merged adjacent distribution transformers can be merged into the same electrical island area.

[0068] In another embodiment, the power distribution network connection diagram is defined as Points and The undirected graph composed of edges (corresponding to connecting edges) is used as an example to explain that the connected undirected graph state can be initialized. Numbered in sequence, each node number is the electrical island number of the node number, that is, the original distribution network connection undirected graph has Set all line branches to the on state and all switches to the off state.

[0069] Further, merge and connect electrical islands. From 1 to Add edges one by one, and let the node numbers at both ends of the edge be , , each belongs to an electrical island and Electrical Island , if the edge is conducting (which can be achieved by judging that the tie switch on the feeder connecting the adjacent distribution transformer is in the closed state), if Less than , you can place the electrical island The electrical island number of all nodes in is set to , added to the electrical island Centralize the nodes and then delete the electrical islands All nodes in It becomes an empty set, that is, the adjacent distribution transformers that are turned on are merged, and the merged adjacent distribution transformers are merged into the same electrical island area.

[0070] In step 440, the step of obtaining the closing status of the interconnecting switches on the feeders for connecting the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed for the adjacent distribution transformers is repeated until the interconnecting switches on the feeders for connecting the adjacent distribution transformers are in a closed state, determining that the adjacent distribution transformers are in a conducting state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area is repeated until the merging processing of all distribution transformers is completed, so as to partition the distributed photovoltaic distribution system to be processed and obtain multiple electrical island areas.

[0071] In one embodiment, the step of obtaining the closing status of the feeder tie switch for connecting the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed (corresponding to step 420) for the adjacent distribution transformers can be repeatedly performed until the feeder tie switch for connecting the adjacent distribution transformers is in a closed state, determining that the adjacent distribution transformer is in a conducting state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area (corresponding to step 430) until the merging process of all distribution transformers is completed, so as to partition the distributed photovoltaic distribution system to be processed and obtain multiple electrical island areas. It can be understood that the multiple electrical island areas obtained are all non-empty electrical islands in the undirected graph and the nodes contained in the electrical islands.

[0072] In another exemplary embodiment of the present invention, continuing with the above Figure 1 Taking the above embodiment as an example, the anti-islanding protection method based on the intelligent terminal in the station area can also include the following steps: In the case where the electrical island area is pre-set as a black start area, if it is determined that the electrical island area is in a passive island state, a black start process of the electrical island area is implemented based on a grid-connected inverter and an energy storage device corresponding to the electrical island area.

[0073] In one embodiment, if a certain area (corresponding to the electrical island area) is determined in advance as a black start area, that is, the area can achieve an island black start through a grid-connected inverter combined with an energy storage device when the grid is powered off, then the area will not trigger anti-islanding protection when an island state is detected. By monitoring the status of the grid-connected inverter and the energy storage system, it can be determined whether the area is an active island. If it is an active island, the system will allow the area to continue to operate to support the recovery of critical loads or the grid.

[0074] In yet another exemplary embodiment of the present invention, Figure 1 The embodiment described above is used as an example for explanation, wherein the anti-islanding protection method based on the intelligent terminal in the substation is applied to the cloud of the Internet of Things, and can also be a federal master station applied to the cloud of the Internet of Things. Among them, for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal in the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined whether the electrical island area is in a passive islanding state (corresponding to step 130), which can be implemented in the following way: Based on the IoT cloud (or the federal master station of the IoT cloud), for any electrical island area, according to the power supply operation status of the electrical island area, the electrical value of the power-consuming equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the electrical island area is in a passive island state; When the electrical island area is in a passive island state, disconnecting the electrical island area from the network (corresponding to step 140) can be achieved in the following ways: When the electrical island area is in a passive island state, a disconnection operation instruction is initiated to the electrical island area based on the IoT cloud (or the federal master station of the IoT cloud) to disconnect the electrical island area.

[0075] In one embodiment, the substation can collect electrical quantity information of distributed photovoltaic terminals, such as voltage, current, power, frequency, etc. Furthermore, the substation uploads the collected electrical quantity information to the federal master station of the Internet of Things cloud through a wireless private network / wireless public network; the federal master station of the Internet of Things cloud, for any electrical island area, determines whether the electrical island area is in a passive island state based on the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the substation's intelligent distribution and transformation fusion terminal, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area.

[0076] When it is determined that the electrical island area is in a passive island state, the IoT cloud (or the federal master station of the IoT cloud) can issue protection control instructions to the substation terminal, thereby controlling distributed photovoltaic and other equipment to disconnect from the network.

[0077] According to the foregoing description, the anti-islanding protection method based on the intelligent terminal in the substation provided by the present invention determines whether there is an island by real-time monitoring of the electrical data of the substation and controls the substation to quickly cut off the island, thereby improving the stability of the power system, establishing a protection logic algorithm and a protection control strategy, and avoiding grid losses caused by missed judgment and misjudgment of the islanding effect.

[0078] The anti-islanding protection device based on intelligent terminals in a metropolitan area provided by the present invention is described below. The anti-islanding protection device based on intelligent terminals in a metropolitan area described below and the anti-islanding protection method based on intelligent terminals in a metropolitan area described above can be referred to each other.

[0079] Figure 5 It is a structural schematic diagram of the anti-islanding protection device based on the intelligent terminal in the substation provided by the present invention.

[0080] The following will be combined Figure 5 The structure of the anti-islanding protection device based on the intelligent terminal in the substation provided by the present invention is described.

[0081] In an exemplary embodiment of the present invention, Figure 5 It can be seen that the anti-islanding protection device based on the intelligent terminal in the substation area can include an acquisition module 510, a processing module 520, an analysis module 530, and a network disconnection operation module 540. Each module will be introduced below.

[0082] The acquisition module 510 may be configured to acquire a distributed photovoltaic power distribution system to be processed, wherein the distributed photovoltaic power distribution system to be processed includes a plurality of distribution transformers; The processing module 520 may be configured to perform partition processing on the distributed photovoltaic power distribution system to be processed based on the conduction status of the adjacent distribution transformers to obtain a plurality of electrical island areas, wherein the adjacent distribution transformers in each electrical island area are in a conduction state; The analysis module 530 may be configured to determine, for any of the electrical island areas, whether the electrical island area is in a passive island state according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area; The network disconnection operation module 540 may be configured to perform a network disconnection operation on the electrical island area when the electrical island area is in a passive island state.

[0083] In an exemplary embodiment of the present invention, the analysis module 530 can be implemented in the following manner to determine whether the electrical island area is in a passive island state according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area: In the case where the power supply operation state of the electrical island area is a non-power supply operation state, based on the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the distribution transformer in the electrical island area has a voltage value; In the case where the distribution transformer in the electrical island area has a voltage value, determining that the electrical island area is in a passive island state; In the case where the distribution transformer in the electrical island area does not have a voltage value, it is determined that the electrical island area is not in a passive island state.

[0084] In an exemplary embodiment of the present invention, the analysis module 530 may determine the power supply operation status of the electrical island area in the following manner: Acquiring a switch closing state of a power supply side switch corresponding to the electrical island area; If the switch closing state of the power supply side switch corresponding to the electrical island area is in an unclosed state, it is determined that the power supply operation state of the electrical island area is a non-power supply operation state.

[0085] In an exemplary embodiment of the present invention, the analysis module 530 may determine the voltage value of the distribution transformer in the electrical island area in the following manner: When the electrical quantity value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation is greater than the electrical quantity value uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined that the distribution transformer in the electrical island area has a voltage value.

[0086] In an exemplary embodiment of the present invention, the network disconnection operation module 540 can implement the network disconnection operation on the electrical island area when the electrical island area is in a passive island state in the following manner: When the electrical island area is in a passive island state, disconnecting the grid-connected line switch of the electrical island area within a first time period; If the grid-connected line switch in the electrical island area is not disconnected within the first time period, the main distribution transformer switch of the distributed photovoltaic power distribution system to be processed is disconnected within the second time period.

[0087] In an exemplary embodiment of the present invention, the processing module 520 may implement partitioning of the distributed photovoltaic power distribution system to be processed based on the conduction status of the adjacent distribution transformers to obtain multiple electrical island areas in the following manner: Based on the distributed photovoltaic power distribution system to be processed, construct a distribution network connection graph corresponding to the distributed photovoltaic power distribution system to be processed, wherein the distribution network connection graph is an undirected graph consisting of a plurality of nodes and a plurality of connection edges, the nodes correspond to the distribution transformers, and the connection edges correspond to the feeders in the distributed photovoltaic power distribution system to be processed; For the adjacent distribution transformer, obtaining the closing status of the tie switch on the feeder line connected to the adjacent distribution transformer in the distributed photovoltaic distribution system to be processed; When the tie switch on the feeder connecting the adjacent distribution transformers is in a closed state, determining that the adjacent distribution transformers are in a conducting state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area; Repeat the steps of obtaining the closing status of the tie switches on the feeders used to connect the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed for the adjacent distribution transformers, and determining that the adjacent distribution transformers are in the on state when the tie switches on the feeders used to connect the adjacent distribution transformers are in the closed state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area, until the merging process of all the distribution transformers is completed, so as to realize the partitioning process of the distributed photovoltaic distribution system to be processed and obtain multiple electrical island areas.

[0088] In an exemplary embodiment of the present invention, the anti-islanding protection device based on the intelligent terminal in the substation also includes a black start module, wherein the black start module can be configured to: when the electrical island area is pre-set as a black start area, if it is determined that the electrical island area is in a passive islanding state, then black start processing of the electrical island area is implemented based on the grid-connected inverter and energy storage device corresponding to the electrical island area.

[0089] In an exemplary embodiment of the present invention, the anti-islanding protection device based on the intelligent terminal in the substation is applied to the cloud of the Internet of Things; the analysis module 530 can be implemented in the following manner to determine whether any of the electrical island areas is in a passive islanding state according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal in the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area: Based on the IoT cloud, for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the electrical island area is in a passive island state; The network disconnection operation module 540 can implement the network disconnection operation on the electrical island area when the electrical island area is in a passive island state in the following manner: When the electrical island area is in a passive island state, a network disconnection operation instruction is initiated to the electrical island area based on the Internet of Things cloud to perform a network disconnection operation on the electrical island area.

[0090] Figure 6 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6 As shown, the electronic device may include: a processor (processor) 610 , a communication interface (Communications Interface) 620 , a memory (memory) 630 and a communication bus 640 , wherein the processor 610 , the communication interface 620 , and the memory 630 communicate with each other through the communication bus 640 . The processor 610 can call the logic instructions in the memory 630 to execute the anti-islanding protection method based on the intelligent terminal in the substation, which method includes: obtaining a distributed photovoltaic distribution system to be processed, wherein the distributed photovoltaic distribution system to be processed includes multiple distribution transformers; based on the conduction status of adjacent distribution transformers, zoning the distributed photovoltaic distribution system to be processed to obtain multiple electrical island areas, wherein the adjacent distribution transformers in each electrical island area are in a conducting state; for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the electrical island area is in a passive island state; when the electrical island area is in a passive island state, disconnect the electrical island area from the network.

[0091] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0092] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the anti-islanding protection method based on the intelligent terminal in the substation provided by the above methods, the method comprising: obtaining a distributed photovoltaic distribution system to be processed, wherein the distributed photovoltaic distribution system to be processed includes multiple distribution transformers; based on the conduction status of adjacent distribution transformers, the distributed photovoltaic distribution system to be processed is partitioned to obtain multiple electrical island areas, wherein the adjacent distribution transformers in each electrical island area are in a conducting state; for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical value uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the electrical island area is in a passive island state; when the electrical island area is in a passive island state, disconnect the electrical island area from the network.

[0093] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the anti-islanding protection method based on the intelligent terminal in the substation provided by the above-mentioned methods, the method comprising: obtaining a distributed photovoltaic distribution system to be processed, wherein the distributed photovoltaic distribution system to be processed comprises a plurality of distribution transformers; based on the conduction conditions of adjacent distribution transformers, zoning the distributed photovoltaic distribution system to be processed to obtain a plurality of electrical island areas, wherein adjacent distribution transformers in each electrical island area are in a conduction state; for any of the electrical island areas, determining whether the electrical island area is in a passive islanding state according to the power supply operation state of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution transformer fusion terminal in the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area; and when the electrical island area is in a passive islanding state, disconnecting the electrical island area from the network.

[0094] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preventing islanding based on intelligent terminals in a substation, characterized in that: The method comprises: Acquire a distributed photovoltaic power distribution system to be processed, wherein the distributed photovoltaic power distribution system to be processed includes a plurality of distribution transformers; Based on the conduction status of the adjacent distribution transformers, the distributed photovoltaic distribution system to be processed is partitioned to obtain a plurality of electrical island areas, wherein the adjacent distribution transformers in each electrical island area are in a conduction state; For any of the electrical island areas, determine whether the electrical island area is in a passive island state according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area; When the electrical island area is in a passive island state, the electrical island area is disconnected from the network.

2. The anti-islanding protection method based on intelligent terminals in a substation area according to claim 1 is characterized in that: The determining whether the electrical island area is in a passive island state according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area specifically includes: In the case where the power supply operation state of the electrical island area is a non-power supply operation state, based on the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the distribution transformer in the electrical island area has a voltage value; In the case where the distribution transformer in the electrical island area has a voltage value, determining that the electrical island area is in a passive island state; In the case where the distribution transformer in the electrical island area does not have a voltage value, it is determined that the electrical island area is not in a passive island state.

3. The anti-islanding protection method based on intelligent terminals in a substation area according to claim 2 is characterized in that: Determining the power supply operation status of the electrical island area is achieved by: Acquiring a switch closing state of a power supply side switch corresponding to the electrical island area; If the switch closing state of the power supply side switch corresponding to the electrical island area is in an unclosed state, it is determined that the power supply operation state of the electrical island area is a non-power supply operation state.

4. The anti-islanding protection method based on intelligent terminals in a substation area according to claim 2 is characterized in that: Determining the voltage value of the distribution transformer in the electrical island area is achieved by: When the electrical quantity value of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation is greater than the electrical quantity value uploaded by the photovoltaic inverter corresponding to the electrical island area, it is determined that the distribution transformer in the electrical island area has a voltage value.

5. The anti-islanding protection method based on intelligent terminals in a substation area according to claim 1 is characterized in that: When the electrical island area is in a passive island state, disconnecting the electrical island area from the network specifically includes: When the electrical island area is in a passive island state, disconnecting the grid-connected line switch of the electrical island area within a first time period; If the grid-connected line switch in the electrical island area is not disconnected within the first time period, the main distribution transformer switch of the distributed photovoltaic power distribution system to be processed is disconnected within the second time period.

6. The anti-islanding protection method based on intelligent terminals in a substation area according to claim 1 is characterized in that: Before partitioning the distributed photovoltaic power distribution system to be processed based on the conduction status of the adjacent distribution transformers to obtain a plurality of electrical island areas, the method further includes: Based on the distributed photovoltaic power distribution system to be processed, construct a distribution network connection graph corresponding to the distributed photovoltaic power distribution system to be processed, wherein the distribution network connection graph is an undirected graph consisting of a plurality of nodes and a plurality of connection edges, the nodes correspond to the distribution transformers, and the connection edges correspond to the feeders in the distributed photovoltaic power distribution system to be processed; For the adjacent distribution transformer, obtaining the closing status of the tie switch on the feeder line connected to the adjacent distribution transformer in the distributed photovoltaic distribution system to be processed; Based on the conduction status of the adjacent distribution transformers, the distributed photovoltaic distribution system to be processed is partitioned to obtain multiple electrical island areas, specifically including: When the tie switch on the feeder connecting the adjacent distribution transformers is in a closed state, determining that the adjacent distribution transformers are in a conducting state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area; Repeat the steps of obtaining the closing status of the tie switches on the feeders used to connect the adjacent distribution transformers in the distributed photovoltaic distribution system to be processed for the adjacent distribution transformers, and determining that the adjacent distribution transformers are in the on state when the tie switches on the feeders used to connect the adjacent distribution transformers are in the closed state, merging the adjacent distribution transformers, and merging the merged adjacent distribution transformers into the same electrical island area, until the merging process of all the distribution transformers is completed, so as to realize the partitioning process of the distributed photovoltaic distribution system to be processed and obtain multiple electrical island areas.

7. The anti-islanding protection method based on intelligent terminals in a substation area according to claim 1 is characterized in that: The method further comprises: In the case where the electrical island area is pre-set as a black start area, if it is determined that the electrical island area is in a passive island state, a black start process of the electrical island area is implemented based on a grid-connected inverter and an energy storage device corresponding to the electrical island area.

8. The anti-islanding protection method based on intelligent terminals in a substation area according to any one of claims 1 to 7, characterized in that: The anti-islanding protection method based on intelligent terminals in the substation area is applied to the cloud side of the Internet of Things; For any of the electrical island areas, determining whether the electrical island area is in a passive island state is performed according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, specifically including: Based on the IoT cloud, for any of the electrical island areas, according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area, determine whether the electrical island area is in a passive island state; When the electrical island area is in a passive island state, disconnecting the electrical island area from the network specifically includes: When the electrical island area is in a passive island state, a network disconnection operation instruction is initiated to the electrical island area based on the Internet of Things cloud to perform a network disconnection operation on the electrical island area. 9.An anti-islanding protection device based on intelligent terminal in the substation area, characterized in that: The device comprises: An acquisition module, used for acquiring a distributed photovoltaic power distribution system to be processed, wherein the distributed photovoltaic power distribution system to be processed includes a plurality of distribution transformers; A processing module, configured to perform partition processing on the distributed photovoltaic distribution system to be processed based on the conduction status of the adjacent distribution transformers to obtain a plurality of electrical island areas, wherein the adjacent distribution transformers in each electrical island area are in a conduction state; An analysis module is used to determine, for any of the electrical island areas, whether the electrical island area is in a passive island state according to the power supply operation status of the electrical island area, the electrical quantity values ​​of the electrical equipment corresponding to the electrical island area collected by the intelligent distribution and transformation fusion terminal of the substation area, and the electrical quantity values ​​uploaded by the photovoltaic inverter corresponding to the electrical island area; The network disconnection operation module is used to perform a network disconnection operation on the electrical island area when the electrical island area is in a passive island state.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the anti-islanding protection method based on the intelligent terminal in the substation is implemented as described in any one of claims 1 to 8.

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