Self-healing control method and system of power distribution network

Abstract

The invention belongs to the field of intelligent operation and maintenance, and particularly relates to a self-healing control method and system of a power distribution network. Comprising the following steps: if a permanent fault occurs in a power distribution network, controlling a corresponding power distribution terminal to perform opening processing after a fault point is positioned, and reporting a load node to be transferred and the capacity thereof to other middle stations with load transfer capacity; other middle stations determine load gaps according to the capacity meeting the capacity of the load nodes and the difference between the capacity of the load nodes which are powered by the middle stations currently and the capacity of the load nodes which need to be powered by the middle stations and need to be powered by the load nodes to be transferred; under the condition that a load gap exists, taking the condition that the total capacity of the load nodes needing power supply and stopping power supply is not smaller than the load gap as a constraint condition, constructing a target function according to the minimum load loss obtained by the capacity of the load nodes needing power supply and stopping power supply and a load weight coefficient, and solving the power supply state of the node; other middle stations control power supply of the power distribution terminal according to the solving result; the higher the importance degree of the load nodes is, the larger the load weight coefficient is.

Description

Technical Field

[0001] The present invention belongs to the field of intelligent operation and maintenance, and specifically relates to a self-healing control method and system for a distribution network. Background Art

[0002] The distribution network refers to a power grid that receives electric energy from the transmission network or regional power plants and distributes it locally or step by step according to voltage to various users through distribution facilities. It is composed of overhead lines, cables, towers, distribution transformers, disconnectors, reactive power compensators and some ancillary facilities, and plays an important role in distributing electric energy in the power grid. The main task of the distribution network is to further transmit electricity from the transmission network of the power system to users to realize the distribution and supply of electric energy.

[0003] Since the distribution network bears important responsibilities for power transmission, once a distribution network fails, it will cause multiple impacts, including but not limited to power supply interruption, equipment damage, reduced user experience, economic losses, and reduced stability of the power system. Therefore, the operation and maintenance of the distribution network should be strengthened, and the failure should be discovered and handled in a timely manner to ensure the safe and stable operation of the distribution network.

[0004] When a fault occurs in the distribution network, the measure usually taken is to directly open the distribution switch of the distribution terminal at the located fault point after the fault is located to achieve fault isolation. At this time, some load nodes that have not failed are often affected by the opening of the distribution switch at the fault point and cannot be powered normally. In this case, other distribution terminals are usually used to transfer power to eliminate the impact. However, the load capacity that can be transferred by other distribution terminals is often limited, and the distribution terminals used for transfer also need to supply power to their own load nodes. It is possible that it is difficult to take into account the capacity requirements of the load nodes that need to be transferred and the capacity requirements of their own original load nodes, resulting in the inability to provide timely power supply to some key nodes or even the overall transfer failure. Summary of the invention

[0005] The purpose of the present invention is to provide a self-healing control method and system for a distribution network, which is used to solve the problem in the prior art that when transferring load to some non-faulty load nodes affected by the opening of distribution switches at the fault point by adopting other distribution terminals to transfer load, it may lead to the inability to provide timely power supply to some key nodes or even the overall transfer failure.

[0006] In order to achieve the above object, the present invention provides a self-healing control method for a distribution network, the method comprising:

[0007] If a permanent fault occurs in the distribution network, the distribution switch of the distribution terminal corresponding to the fault point will be controlled to open after the fault point is located, and the determined load node to be transferred and its capacity will be reported to other middle stations with load transfer capabilities;

[0008] The other middle stations determine the load gap based on their own ability to meet the load node capacity and the difference between the capacity of the load nodes that need power supply, including the load nodes currently powered by themselves and the load nodes to be transferred; when a load gap exists, the total capacity of the load nodes that need power supply and have stopped power supply is not less than the load gap as a constraint condition, and the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need power supply and have stopped power supply and a load weight coefficient that is not less than 0, and the power supply status of the load nodes that need power supply is solved. The other middle stations control the power supply of the distribution terminal according to the solution results; the higher the importance of the load node, the greater the load weight coefficient.

[0009] Beneficial effect: The present invention provides a new self-healing control method for a distribution network, which disconnects the distribution switch of the distribution terminal corresponding to the fault point determined to be a permanent fault to isolate the fault, and other middle stations with load transfer capability transfer the load to the load node by cutting off their own load nodes (that is, stopping power supply to their own less important load nodes to supply power to the load nodes to be transferred); that is, the other middle station determines the load gap based on the difference between its own ability to meet the load node capacity and the capacity of the load nodes that need to be powered, including the load nodes currently powered by itself and the load nodes to be transferred, and then uses the load gap as a constraint condition to obtain the load loss minimum objective function; by solving the objective function, the result is obtained as the power supply status of each load node that needs power supply (the power supply status is divided into two types: power supply status and power supply stop status), and the power supply of the distribution terminal is controlled according to the solution result. After isolating the fault point, the method can realize load transfer to the load nodes that are affected and cause power outage; the load transfer is carried out by other middle stations with load transfer capabilities to the current middle station based on the load nodes to be transferred and their capacities; this load transfer method enables the middle station providing load transfer to provide relatively accurate and timely power supply to the middle station to be transferred while meeting its own original load node capacity requirements (that is, without affecting the normal power supply of the middle station providing load transfer to its key nodes).

[0010] Furthermore, if a transient fault occurs in the distribution network, the power supply to the areas within the range of the middle station of the distribution network is restored through the middle station corresponding to the faulty area.

[0011] Further, the method of determining whether a transient fault or a permanent fault occurs in the distribution network includes: when a fault occurs in the distribution network, the distribution terminal and the fault indicator send the fault information to the corresponding middle station; the middle station searches in the topological network of the distribution network according to the fault information to preliminarily determine the fault area;

[0012] The switches in the fault area are controlled by the middle station to reclose, and the fault type of the lines in the fault area is determined.

[0013] Furthermore, it also includes: when there is no load gap, the total capacity of the load nodes that need power supply and stop power supply is not less than the load gap as a constraint condition, and the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need power supply and stop power supply and the load weight coefficient not less than 0, and the power supply status of the load nodes that need power supply is solved, and the other middle stations control the power supply of the distribution terminal according to the solution results.

[0014] Furthermore, it also includes: when there is no load gap, the other middle stations directly control the power supply according to the load nodes to be transferred and their capacities.

[0015] Furthermore, if a permanent fault occurs in the distribution network, the method for locating the fault point includes: after the middle station controls the switches in the fault area to reclose, if it is determined that a permanent fault occurs in the distribution network, the switches in the fault area are controlled to trip, and the middle station locates the fault point based on the information obtained from the tripping operation.

[0016] Furthermore, the method for determining the load node to be transferred includes: according to the topological network within the substation corresponding to the fault point and the location of the fault point, determining as the load node to be transferred a load node that is not at fault and whose power supply is stopped at the same time due to the topological relationship with the fault point when the distribution terminal corresponding to the fault point is controlled for tripping; the topological network within the substation of the middle station is obtained by obtaining the ID attribute information and neighbor information of the distribution terminals and fault indication devices of the distribution network in the substation by the middle station, and establishing and updating the topological network of the distribution terminals and fault indicators of the distribution network in the substation.

[0017] Furthermore, the total capacity of the load nodes that need to be powered and whose power supply is stopped is not less than the load gap as a constraint condition, and the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need to be powered and whose power supply is stopped and the load weight coefficient set, and the power supply status of the load nodes that need to be powered is solved as follows:

[0018] and

[0019] Where N is the sum of the number of load nodes that need power supply; when a i When 1 is taken, a i Indicates that the load node i that needs power supply is in the power supply state; when a i When it is 0, a i Indicates that the load node i that needs to be powered is in the power supply stop state; λ i is the load weight coefficient of the load node i that needs power supply; P iis the active power corresponding to the capacity of load node i; P 缺 is the load gap; solving F gives a i The value of a i Whether the value is 0 or 1 determines the power supply status of the load node that needs power supply.

[0020] The present invention also provides a self-healing control system for a distribution network, comprising a processor for executing a computer program to implement the steps of a self-healing control method for a distribution network.

[0021] The self-healing control system of the distribution network can achieve the same beneficial effects as the above-mentioned self-healing control method of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an example flow chart of the self-healing control method of the distribution network in the embodiment of the self-healing control method of the distribution network of the present invention;

[0023] Figure 2 This is an example diagram of the application of the self-healing control method for a distribution network in an embodiment of the self-healing control method for a distribution network of the present invention in a middle station system. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Embodiment of self-healing control method for distribution network

[0026] This embodiment provides a self-healing control method for a distribution network. After determining the fault point of a permanent fault within the range of a middle station and isolating the fault, other middle stations with load transfer capability transfer load to the load nodes (i.e., load nodes to be transferred) that are affected by the fault point and cause a power outage; the load transfer uses the calculated load gap corresponding to the load transfer of all load nodes to be transferred that the middle station used for load transfer needs to achieve as a constraint condition, and refers to the importance of the node, and constructs an objective function based on the principle of minimizing load loss. It only needs to solve the objective function to obtain the power supply status of all load nodes that need to be powered on (i.e., load nodes to be transferred and load nodes that other middle stations that perform load transfer need to power on) that minimize load losses on the basis of satisfying the constraints; other middle stations with load transfer capability control the distribution terminals to supply power to the load nodes to be transferred based on the solution results. By using this method to transfer load, other middle stations with load transfer capabilities can measure their actual transfer capabilities to transfer power, that is, while satisfying the normal power supply of more important nodes within their own range, they can provide timely and more accurate power supply to more important load nodes to be transferred, effectively avoiding the overall transfer failure while ensuring priority power supply to more important nodes. The method specifically includes:

[0027] If a permanent fault occurs in the distribution network, the fault point will be located and the corresponding distribution terminal will be controlled to open the switch (i.e. the distribution switch of the corresponding distribution terminal will be controlled to open the switch), and the load nodes to be transferred and their capacities will be reported to other middle stations with load transfer capabilities;

[0028] Other middle stations determine the load gap based on the difference between their own ability to meet the load node capacity and the capacity of the load nodes that need to be powered, including the load nodes currently powered by themselves and the load nodes to be transferred (that is, the load nodes that need to be powered include two types of nodes, namely the load nodes currently powered by themselves and the load nodes to be transferred of other middle stations with load transfer capabilities); when a load gap exists, the total capacity of the load nodes that need to be powered and have stopped power supply is not less than the load gap as a constraint condition, and the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need to be powered and have stopped power supply and a load weight coefficient that is not less than 0, and the power supply status of the load nodes that need to be powered is solved, and other middle stations control the power supply of the distribution terminals according to the solution results; the higher the importance of the load node, the greater the load weight coefficient.

[0029] The method provided in this embodiment is actually that when a permanent fault occurs in the present middle station, other middle stations with load transfer capabilities supply power to the load nodes to be transferred (i.e., normal load nodes that are forced to lose power due to the fault point) of the present middle station; and the demand for load transfer (i.e., the power supply status of each load node that needs power supply) is obtained by solving the constructed load loss minimum objective function based on the calculated load gap as a constraint. Since this method can achieve relatively accurate load transfer, load transfer through this method can enable the middle station providing load transfer to take into account its own original load node capacity requirements and the load nodes to be transferred and their capacities, that is, to provide relatively accurate and timely power supply to the middle station to be transferred without affecting its own normal power supply needs.

[0030] It also includes: when there is no load gap, the total capacity of the load nodes that need power supply and stop power supply is not less than the load gap as a constraint condition, and the objective function is constructed to minimize the load loss obtained according to the capacity of the load nodes that need power supply and stop power supply and the load weight coefficient that is not less than 0, and the power supply status of the load nodes that need power supply is solved. Other middle stations control the power supply of the distribution terminals according to the solution results.

[0031] It also includes: when there is no load gap, other middle stations directly control the power supply according to the load nodes to be transferred and their capacity.

[0032] Specifically, Figure 1As shown, when a fault occurs in the distribution network, the fault type of the distribution network is first determined, that is, whether the fault is a permanent fault or a transient fault. If the fault is a permanent fault, after locating the fault point, the middle station A corresponding to the fault point sends a fault isolation command to the distribution terminal of the fault point to control the opening of the distribution switch at the fault point to achieve fault isolation; at the same time, the load transfer demand is reported to the load transfer middle station B (that is, other middle stations with load transfer capabilities, which must not be the same as the middle station A; the premise of having load transfer capabilities is to have the ability to connect the load node to be transferred through the closing operation to supply power to the transfer load node); the content of the load transfer demand includes: the load node to be transferred and its capacity.

[0033] The load transfer station B determines the load gap P based on the difference between its own ability to meet the load node capacity and the capacity of the load nodes that need to be powered, including the load nodes currently powered by itself and the load nodes to be transferred. 缺 ; According to the load gap P 缺 The different states of load transfer affect the control of the distribution terminal of the middle station B to supply power to the middle station A in the following two situations:

[0034] Case 1: Load gap P 缺 exists; in this case, the way to control power supply includes: taking the total capacity of the load node that needs to be powered and stops power supply as a constraint condition that is not less than the load gap, constructing an objective function with the minimum load loss obtained according to the capacity of the load node that needs to be powered and stops power supply and a load weight coefficient that is not less than 0 (the load weight coefficient is a weight coefficient introduced according to the importance of the load node, that is, different load weight coefficients are set according to the importance of different load nodes; the higher the importance of the load node, the larger the load weight coefficient), and solving the power supply state of the load node that needs to be powered; specifically as follows:

[0035] and

[0036] Where N is the sum of the number of load nodes that need to be powered (i.e., the number of load nodes currently powered by the load transfer station B + the number of load nodes to be transferred that were previously powered by the station A); i When 1 is taken, a i Indicates that the load node i that needs power supply is in the power supply state; when a i When it is 0, a i Indicates that the load node i that needs to be powered is in the power supply stop state; λ i is the load weight coefficient of the load node i that needs power supply; P i is the active power corresponding to the capacity of load node i; P 缺 is the load gap; solving F gives a iThe value of a i Whether it is 0 or 1 determines the power supply status of the load node that needs power supply. Figure 2 As shown, after the above solution is obtained, the load transfer station B controls the corresponding distribution terminal according to the solution result, and the distribution terminal executes the load reduction tripping command (that is, the load reduction tripping command obtained according to the solution result, the content of the command is to control the load node that needs to be cut off within the range of the load transfer station B to perform the tripping operation). After the load node is cut off, the contact closing can be executed to restore power supply to the non-fault area within the range of the station A, and upload the fault information, processing results and emergency repair information to the distribution automation master station. The way of changing the power supply state of the load node i that needs power supply is based on the power supply state of the load node i that needs power supply determined by the above objective function (divided into power supply / no power supply) and the previous power supply state of the load node i that needs power supply (divided into power supply / no power supply), which is specifically divided into the following four cases:

[0037] 1) When the solution is a i =1, if the load node i that needs power supply was in the power supply state before, its power supply state will be maintained unchanged;

[0038] 2) When the solution is a i =1, if the load node i that needs power supply is in the power-off state before, the power supply operation is performed on it to change it from the power-off state to the power-on state;

[0039] 3) When the solution is a i =0, if the load node i that needs power supply was in the power supply state before, the power supply state is cut off to change it from the power supply state to the power supply stop state;

[0040] 4) When the solution is a i =0, if the power supply load node i was previously in the power supply stop state, its power supply stop state is maintained unchanged.

[0041] Case 2: Load gap P 缺 does not exist; in this case, you can choose one of the following two ways to control the power supply ( Figure 1 The "①OR②" shown here means you can choose one of these two options):

[0042] Method ①: With the total capacity of the load nodes that need to be powered and the power supply stopped being not less than the load gap as a constraint condition, the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need to be powered and the load weight coefficient that is not less than 0 (the load weight coefficient is consistent with the load weight coefficient in case one), and the power supply status of the load nodes that need to be powered is solved; the method and the four situations of controlling the corresponding power supply of the distribution terminal according to the solution results are the same as those in case one, and will not be repeated here.

[0043] Method ②: Load gap P缺 does not exist, other middle stations directly control power supply according to the load nodes to be transferred and their capacities; that is, all solutions can be satisfied as a i =1 (i.e., supplying power to all load nodes to be transferred), there is no need to solve the condition and control the power supply of the corresponding distribution terminal according to the solution result.

[0044] Moreover, the result obtained by solving the problem through method ① is usually consistent with the case where the power supply is directly controlled according to method ②, so any one of them can be selected; selecting method ① can make the power supply control method of case 2 consistent with the power supply control method of case 1, and the two cases can share a set of algorithm programs corresponding to the power supply control, without the need to set up additional algorithm programs for different cases, saving development costs; and selecting method ② can make the power supply control method of case 2 simpler than the power supply control method of case 1, with smaller calculation amount and less error-prone, saving calculation costs and improving control efficiency; the specific selection of method ① or method ② can be flexibly selected according to actual needs and the advantages of both.

[0045] In this embodiment, if a transient fault occurs in the distribution network, the power supply to the areas within the range of the middle station of the distribution network is restored through the middle station corresponding to the faulty area.

[0046] Specifically, Figure 1 As shown in the figure, after determining the fault area, if the result of judging the fault type of the distribution network is a transient fault, the power supply is restored to the areas within the range of the distribution network (i.e., the range of the controllable distribution terminals corresponding to the middle station) directly through the middle station corresponding to the fault area; for transient faults, additional repair work is usually not required, because the fault has been eliminated by itself, so the power supply can be restored by the control of this middle station. However, it is still necessary to patrol and inspect the lines to ensure that there are no other potential problems.

[0047] In this embodiment, the method of determining whether a transient fault or a permanent fault occurs in the distribution network includes: when a fault occurs in the distribution network, the distribution terminal and the fault indicator send the fault information to the corresponding middle station; the middle station searches in the topological network of the distribution network according to the fault information to preliminarily determine the fault area;

[0048] The switches in the fault area are controlled by the middle station to reclose and the fault type of the lines in the fault area is determined.

[0049] Specifically, when a fault occurs in the distribution network, the type of fault that occurs in the distribution network is first determined, that is, whether the fault is a permanent fault or a transient fault; the way to make this judgment is: the fault information detected by each is sent to the middle station to which it belongs (that is, the corresponding middle station) through the distribution terminal and the fault indicator. The middle station implements data interaction and topology identification with the distribution terminals and fault indicators within the range of the middle station, and establishes a unified self-describing model. Through this model, the topological network of the distribution network is searched according to the received fault information to preliminarily determine the fault area. In other embodiments, other devices with fault detection capabilities can also upload the collected fault information to the middle station, identify it through the unified self-describing model established by the middle station, and preliminarily determine the fault area through different information provided by different devices. Since the method of identifying through the unified self-describing model established by the middle station and preliminarily determining the fault area through different information provided by different devices belongs to the existing technology, it will not be repeated here; the middle station will then reclose the switches in the preliminarily determined fault area (that is, after the fault occurs and the circuit breaker trips, the circuit breaker is automatically turned on as needed to try to restore power supply) to determine whether the fault type is a permanent fault or a transient fault. The specific judgment method is as follows:

[0050] If the reclosing is successful (i.e. the line can operate stably after the circuit breaker is reclosed and there is no re-tripping), it means that the fault is a transient fault; transient faults are caused by short-term factors, and once these factors disappear, the fault is also eliminated.

[0051] If the reclosing fails (i.e. the circuit breaker trips again immediately or within a short period of time after being reclosed), it indicates that the fault is a permanent fault (since a permanent fault still exists after the line is disconnected, even if the reclosing action closes the circuit breaker again, the line will be disconnected again by the circuit breaker operated by the relay protection, causing the reclosing to fail).

[0052] In this embodiment, if a permanent fault occurs in the distribution network, the method for locating the fault point includes: after the middle station controls the switch in the fault area to reclose, if it is determined that a permanent fault occurs in the distribution network, the switch in the fault area is controlled to perform a tripping operation, and the middle station locates the fault point according to the information obtained by the tripping operation. In fact, the load node to be transferred is a normal load node that is disconnected and de-energized due to the fault point when the tripping operation is performed in the initially determined fault area (that is, a load node without a fault that is simultaneously de-energized due to the topological relationship with the fault point when the distribution switch of the distribution terminal corresponding to the control fault point is disconnected).

[0053] Specifically, Figure 1As shown, after determining the fault area, if the result of judging the fault type of the distribution network is a permanent fault, the switch in the fault area is controlled to perform a tripping operation (i.e., the reclosing device is locked to prevent another attempt at reclosing), and the middle station locates the fault point based on the information obtained by the tripping operation. Since the method and principle of locating the fault point based on the information obtained by the tripping operation belongs to the prior art, it will not be repeated here.

[0054] In this embodiment, the method for determining the load node to be transferred includes: according to the topological network within the substation of the middle station corresponding to the fault point and the location of the fault point, determining as the load node to be transferred the load node that is not at fault and whose power supply is stopped at the same time due to the topological relationship with the fault point when the distribution switch of the distribution terminal corresponding to the fault point is opened; the topological network within the substation of the middle station is obtained by obtaining the ID attribute information and neighbor information of the distribution terminals and fault indication devices of the distribution network in the substation by the middle station, and establishing and updating the topological network of the distribution terminals and fault indicators of the distribution network in the substation.

[0055] Specifically, in this embodiment, the topological network of the middle station is established by exchanging data with the distribution terminals and fault indicators within the station area through the middle station to obtain their ID attribute information and neighbor information, and then establishing a topological network including the distribution terminals and fault indicators within the range of the middle station, and being able to update it.

[0056] Self-healing control system implementation example of distribution network

[0057] This embodiment provides a self-healing control system for a distribution network, the system includes a processor, the processor stores executable program instructions, the executable program instructions are used to implement the self-healing control method for the distribution network in the above-mentioned embodiment of the self-healing control method for the distribution network.

[0058] Since the specific working mode and working principle of the self-healing control system of the distribution network of this embodiment have been described in detail in the above-mentioned embodiment of the self-healing control method of the distribution network, they will not be repeated here.

[0059] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, but do not constitute a limitation to the present invention.

Claims

1. A self-healing control method for a distribution network, characterized in that: include: If a permanent fault occurs in the distribution network, the fault point will be located and the corresponding distribution terminal will be controlled to open the switch, and the load nodes to be transferred and their capacities will be reported to other middle stations with load transfer capabilities; The other middle station determines the load gap according to the difference between its own ability to meet the load node capacity and the capacity of the load nodes that need to be powered, including the load nodes currently powered by itself and the load nodes to be transferred; When a load gap exists, the total capacity of the load nodes that need power supply and stop power supply is not less than the load gap as a constraint condition, and the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need power supply and stop power supply and the load weight coefficient that is not less than 0, and the power supply status of the load nodes that need power supply is solved. The other middle stations control the power supply of the distribution terminals according to the solution results; the higher the importance of the load node, the greater the load weight coefficient.

2. A self-healing control method for a distribution network according to claim 1, characterized in that: If a transient fault occurs in the distribution network, the power supply will be restored to all areas within the range of the middle station of the distribution network controlled by the middle station corresponding to the faulty area.

3. A self-healing control method for a distribution network according to claim 2, characterized in that: The method of determining whether a transient fault or a permanent fault occurs in the distribution network includes: when a fault occurs in the distribution network, the distribution terminal and the fault indicator send the fault information to the corresponding middle station; the middle station searches in the topological network of the distribution network according to the fault information to preliminarily determine the fault area; The switches in the fault area are controlled by the middle station to reclose, and the fault type of the lines in the fault area is determined.

4. A self-healing control method for a distribution network according to any one of claims 1 to 3, characterized in that: Also includes: When there is no load gap, the total capacity of the load nodes that need power supply and stop power supply is not less than the load gap as a constraint condition, and the objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need power supply and stop power supply and the load weight coefficient that is not less than 0, and the power supply status of the load nodes that need power supply is solved. The other middle stations control the power supply of the distribution terminals according to the solution results.

5. A self-healing control method for a distribution network according to any one of claims 1 to 3, characterized in that: Also includes: When there is no load gap, the other middle stations directly control the power supply according to the load nodes to be transferred and their capacities.

6. A self-healing control method for a distribution network according to claim 3, characterized in that: If a permanent fault occurs in the distribution network, the method for locating the fault point includes: after the middle station controls the switches in the fault area to reclose, if it is determined that a permanent fault occurs in the distribution network, the switches in the fault area are controlled to trip, and the middle station locates the fault point based on the information obtained from the tripping operation.

7. A self-healing control method for a distribution network according to any one of claims 1 to 3, characterized in that: The method for determining the load node to be transferred includes: according to the topological network within the substation area of ​​the middle station corresponding to the fault point and the location of the fault point, determining the load node without fault that is stopped from supplying power at the same time due to the topological relationship with the fault point when the distribution terminal corresponding to the fault point is controlled for tripping as the load node to be transferred; the topological network within the substation area of ​​the middle station is obtained by obtaining the ID attribute information and neighbor information of the distribution terminals and fault indication devices of the distribution network in the substation area by the middle station, and establishing and updating the topological network of the distribution terminals and fault indicators of the distribution network in the substation area.

8. A self-healing control method for a distribution network according to any one of claims 1 to 3, characterized in that: The constraint condition is that the total capacity of the load nodes that need to be powered and whose power supply is stopped is not less than the load gap. The objective function is constructed by minimizing the load loss obtained according to the capacity of the load nodes that need to be powered and their set load weight coefficient. The power supply status of the load nodes that need to be powered is solved as follows: and Where N is the sum of the number of load nodes that need power supply; when a i When 1 is taken, a i Indicates that the load node i that needs power supply is in the power supply state; when a i When it is 0, a i Indicates that the load node i that needs to be powered is in the power supply stop state; λ i is the load weight coefficient of the load node i that needs power supply; P i is the active power corresponding to the capacity of load node i; P 缺 is the load gap; solving F gives a i The value of a i Whether the value is 0 or 1 determines the power supply status of the load node that needs power supply.

9. A self-healing control system for a distribution network, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the self-healing control method for a distribution network as described in any one of claims 1-8.

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