Power distribution network fault first-aid repair method and device under flood disaster, electronic equipment and storage medium

Abstract

The invention discloses a power distribution network fault first-aid repair method and device under flood disasters, electronic equipment and a storage medium, and belongs to the technical field of power distribution network management.The method comprises the steps that according to power distribution network fault data, the maximum load recovery amount in the power distribution network fault first-aid repair process serves as a target; constructing a power distribution network fault first-aid repair objective function and a corresponding constraint condition; and solving the target function under the constraint of the constraint condition to obtain a scheduling path of an emergency drainage vehicle, a time arrangement of the emergency drainage vehicle, a scheduling path of a first-aid repair construction team, a time arrangement of the first-aid repair construction team, a fault isolation scheme and a power supply area recovery path when the load recovery amount in the power distribution network fault first-aid repair process is maximum. Therefore, by implementing the power distribution network fault emergency repair method, the problem that a power distribution network fault emergency repair method after flood disasters is lacked in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network management, and particularly to a method, device, electronic equipment and storage medium for repairing distribution network faults under flood disasters. Background Art

[0002] With the intensification of global climate change, the frequency of extreme weather events has increased significantly, seriously threatening the safe and stable operation of urban distribution networks. As a typical monsoon climate region, China is often affected by heavy precipitation during typhoon and rainy seasons. In some cities, due to low-lying terrain, poor road permeability and insufficient drainage facilities construction, urban waterlogging is extremely likely to occur. In response to the distribution network fault problems caused by flood disasters, effective emergency response and restoration strategies are urgently needed to improve the disaster resistance ability and restoration efficiency of the distribution network.

[0003] In terms of reducing the impact of flood disasters on the distribution network, some studies have proposed to improve the disaster resistance ability of the power grid through grid equipment reinforcement measures (such as underground cable transformation, transmission line reinforcement, substation upgrading and redundant line construction). However, due to the long cycle of grid planning and transformation, it is difficult to improve the grid response ability in a short time. Moreover, although pre-disaster prevention measures can reduce the probability of distribution equipment failures, it is still difficult to completely avoid failures and power outages caused by flood disasters. Therefore, in order to restore the original topological structure and power supply capacity of the distribution network, a method for repairing distribution network faults under flood disasters is urgently needed to dispatch repair construction teams to repair faulty equipment after flood disasters occur, so as to improve the restoration ability of the distribution network under flood disasters. Summary of the Invention

[0004] The present invention provides a method, device, electronic equipment and storage medium for repairing distribution network faults under flood disasters, which can solve the technical problem that although pre-disaster prevention measures in the prior art can reduce the probability of distribution equipment failures, it is still difficult to completely avoid failures and power outages caused by flood disasters, and there is a lack of a method for repairing distribution network faults after flood disasters occur.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for repairing distribution network faults under flood disasters, including:

[0006] Obtain distribution network fault data; wherein, the distribution network fault data includes: the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access state value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the state value of the construction team starting construction work, the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions.

[0007] Construct an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for the emergency repair of distribution network faults based on the distribution network fault data;

[0008] Based on the emergency drainage vehicle operation model, the repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model, construct an objective function and corresponding constraint conditions for the emergency repair of distribution network faults with the goal of maximizing the load restoration amount during the emergency repair process of the distribution network;

[0009] Solve the objective function under the constraints of the constraint conditions to obtain the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area restoration path when the load restoration amount during the emergency repair process of the distribution network is maximized. Then, based on the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area restoration path, perform emergency repairs on the distribution network.

[0010] As an optimal solution, the construction of the emergency drainage vehicle operation model, the repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model for the emergency repair of distribution network faults based on the distribution network fault data includes:

[0011] Based on the distribution network fault data, construct an emergency drainage vehicle operation model for the emergency repair of distribution network faults with the flooded area of the distribution substation, the water depth of the accumulated water in the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access state value of the emergency drainage vehicle at the time step, and the time step of the drainage operation of the emergency drainage vehicle as inputs and the available state value of the distribution substation after drainage as the output;

[0012] Based on the distribution network fault data, construct a repair construction team operation model for the emergency repair of distribution network faults with the workload required for fault point repair, the workload completed by a single construction team per unit time step, the start construction state value of the construction team, and the available state value of the distribution substation after drainage as inputs and the repair state value of the distribution substation after fault repair as the output;

[0013] Based on the distribution network fault data, construct an emergency vehicle scheduling model for the emergency repair of distribution network faults with emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions as inputs and the scheduling plan for each emergency vehicle as the output;

[0014] Based on the distribution network fault data, taking the fault status value of each substation node, the total number of substation nodes, the substation set of the distribution network, and the distributed power source set of the distribution network as inputs, and taking the fault isolation scheme of the fault area and the restoration path of the power supply area as outputs, a fault area division model for distribution network fault emergency repair is constructed.

[0015] As an optimal solution, the operation model of the emergency drainage vehicle is:

[0016]

[0017] Among them, S i is the flooded area of substation node i, h i is the water accumulation depth of substation node i, Q d is the unit time-step flow rate of emergency drainage vehicle d, is the access status value of emergency drainage vehicle d at time step τ, t is the time step of the drainage operation, is the completion time of the drainage operation, is the available state variable after the substation is drained.

[0018] As an optimal solution, the operation model of the emergency repair construction team is:

[0019]

[0020] Among them, W i is the workload required for the repair completion of substation node i, D c is the workload completed by a single construction team per unit time step, is the status value when the construction team starts construction work, is the completion time of the emergency repair operation, is the repair status value after the substation fault is repaired.

[0021] As an optimal solution, the emergency vehicle scheduling model is:

[0022]

[0023] Among them, is the emergency vehicle information in the scheduling area d / c, E is the initial position of the drainage vehicle and the construction team, tr i,j is the vehicle movement time required from substation node i to substation node j.

[0024] As an optimal solution, the fault area division model is:

[0025]

[0026] Among them, is the fault status value of substation node i, The repair status value of distribution substation node i, z i,j,t is the line switch status value, is whether distribution substation node i is in the fault area at time t, f i,i,t is the starting point of the power supply area restoration path, Ω S and Ω DG are the substation set and the distributed power generation node set respectively, f i,j,t is the restoration path from distribution substation node i to j, and N is the total number of nodes in the distribution network.

[0027] As an optimal solution, the constraint conditions include: distributed power generation output constraint, node load constraint, line power flow constraint, node power constraint, and node voltage constraint;

[0028] The distributed power generation output constraint is:

[0029]

[0030] Among them, and are the active scheduling output and reactive scheduling output of the distributed power generation respectively, and are the maximum output ranges of the units;

[0031] The node load constraint is:

[0032]

[0033] Among them, is the node load restoration amount, is the maximum load demand value of the node load;

[0034] The line power flow constraint is:

[0035]

[0036] Among them, P i,j,t and Q i,j,t are the active power flow and reactive power flow on distribution substation node i-j respectively, and are the maximum line capacities;

[0037] The node power constraint is:

[0038]

[0039]

[0040] Among them, k i,t is the node load power factor;

[0041] The node voltage constraint is as follows:

[0042]

[0043] where U i,t is the node voltage, R i,j and X i,j are the resistance coefficient and reactance coefficient of the line respectively, and U i and are the minimum range and maximum range of the voltage respectively;

[0044] The objective function is as follows:

[0045]

[0046] where ρ i is the load weight of the distribution substation node i.

[0047] Based on the above embodiments, another embodiment of the present invention provides a distribution network fault repair device under flood disasters, including: a distribution network fault data acquisition module, a distribution network fault repair model construction module, an objective function construction module, and a distribution network fault repair module;

[0048] The distribution network fault data acquisition module is used to acquire distribution network fault data; wherein, the distribution network fault data includes: the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access state value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the state value of the construction team starting construction work, the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions;

[0049] The distribution network fault repair model construction module is used to construct an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for distribution network fault repair according to the distribution network fault data;

[0050] The objective function construction module is used to construct the objective function and the corresponding constraint conditions for distribution network fault repair with the maximum load recovery amount during the distribution network fault repair process as the goal according to the emergency drainage vehicle operation model, the repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model;

[0051] The distribution network fault repair module is used to solve the objective function under the constraints of the above-mentioned constraint conditions, so as to obtain the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, the power supply area restoration path, and the maximum load restoration amount when the load restoration amount during the distribution network fault repair process is the largest. Then, according to the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area restoration path, the distribution network is repaired for faults.

[0052] On the basis of the above embodiments, another embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the distribution network fault repair method under flood disasters described in the above embodiments of the present invention.

[0053] On the basis of the above embodiments, another embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program runs, it controls the device where the storage medium is located to execute the distribution network fault repair method under flood disasters described in the above embodiments of the present invention.

[0054] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0055] The present invention provides a method for emergency repair of distribution network faults under flood disasters, which acquires distribution network fault data. The distribution network fault data includes: the flooded area of the distribution substation, the water depth in the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access status value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle's drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the status value of the construction team starting the construction operation, the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions. According to the distribution network fault data, an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for emergency repair of the distribution network are constructed. According to the emergency drainage vehicle operation model, the repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model, with the goal of maximizing the load recovery amount during the emergency repair process of the distribution network, an objective function and corresponding constraint conditions for emergency repair of the distribution network are constructed. Under the constraints of the constraint conditions, the objective function is solved to obtain the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area recovery path when the load recovery amount during the emergency repair process of the distribution network is the largest. Then, according to the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area recovery path, the distribution network is repaired for faults. Through the present invention, a method for emergency repair of distribution network faults under flood disasters can be provided. After a flood disaster occurs, according to the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area recovery path, the repair construction team is dispatched to repair the faults of the distribution network to improve the recovery ability of the distribution network under flood disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic flowchart of a method for emergency repair of a distribution network fault provided by an embodiment of the present invention;

[0057] Figure 2 is a schematic diagram of faults and power supply areas in the distribution network;

[0058] Figure 3 is a topology diagram of the test system;

[0059] Figure 4 is a schematic diagram of the scheduling scheme for different types of emergency supply vehicles;

[0060] Figure 5 is a schematic diagram of the recovery process of the distribution network;

[0061] Figure 6It is a schematic diagram of load recovery for three different recovery methods;

[0062] Figure 7 It is a schematic structural diagram of a distribution network fault repair device provided by an embodiment of the present invention. Detailed implementation manners

[0063] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0066] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0068] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0070] Embodiment 1

[0071] Please refer to Figure 1 , to solve the problem of the lack of a method for repairing distribution network faults after flood disasters in the existing technology, a flowchart of a method for repairing distribution network faults under flood disasters provided by an embodiment of the present invention includes the following specific steps:

[0072] S1. Obtain distribution network fault data; wherein, the distribution network fault data includes: the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access status value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the start construction operation status value of the construction team, the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions;

[0073] Specifically, the present invention proposes a method for repairing urban distribution network faults under flood disasters to solve the problems of low repair resource scheduling efficiency, incomplete fault isolation, and untimely load restoration in the existing technology.

[0074] First, a repair resource scheduling model is constructed based on the situation of urban distribution network faults under urban waterlogging, including the operation and scheduling models of emergency drainage vehicles and construction teams, to optimize the allocation and scheduling path of repair resources;

[0075] First, obtain distribution network fault data: the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access status value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the start construction operation status value of the construction team, the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions, and then construct a repair resource scheduling model according to the distribution network fault data.

[0076] S2. Construct a distribution network fault data and fault area division model based on the said distribution network fault data;

[0077] Preferably, the construction of an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model and a fault area division model for distribution network fault repair according to the said distribution network fault data includes: Based on the said distribution network fault data, taking the flooded area of the distribution substation, the water depth in the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access state value of the emergency drainage vehicle at the time step, and the time step of the drainage operation of the emergency drainage vehicle as inputs, and taking the available state value after the distribution substation is drained as the output, construct an emergency drainage vehicle operation model for distribution network fault repair; Based on the said distribution network fault data, taking the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the start state value of the construction team for construction operations, and the available state value after the distribution substation is drained as inputs, and taking the repair state value after the distribution substation fault is repaired as the output, construct a repair construction team operation model for distribution network fault repair; Based on the said distribution network fault data, taking the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions as inputs, and taking the scheduling plan for each emergency vehicle as the output, construct an emergency vehicle scheduling model for distribution network fault repair; Based on the said distribution network fault data, taking the fault state values of each distribution substation node, the total number of distribution substation nodes, the substation set of the distribution network and the distributed power source set of the distribution network as inputs, and taking the fault isolation plan for the fault area and the restoration path for the power supply area as the output, construct a fault area division model for distribution network fault repair.

[0078] Preferably, the emergency drainage vehicle operation model is:

[0079]

[0080] where S i is the flooded area of distribution substation node i, h i is the water depth in distribution substation node i, Q d is the unit time-step flow rate of emergency drainage vehicle d, is the access state value of emergency drainage vehicle d at time step τ, t is the time step of the drainage operation, is the completion time of the drainage operation, is the available state variable after the distribution substation is drained.

[0081] Preferably, the repair construction team operation model is:

[0082]

[0083] where W i is the workload required to complete the repair of distribution substation node i, D cThe workload completed by a single construction team per time step, is the status value when the construction team starts construction operations, is the completion time of the emergency repair operation, is the repair status value after the failure of the power distribution room is repaired.

[0084] Preferably, the emergency vehicle scheduling model is:

[0085]

[0086] Among them, is the emergency vehicle information within the dispatching area d / c, E is the initial positions of the drainage trucks and the construction teams, tr i,j is the vehicle movement time required from the power distribution room node i to the power distribution room node j.

[0087] Preferably, the fault area division model is:

[0088]

[0089]

[0090] Among them, is the fault status value of the power distribution room node i, the repair status value of the power distribution room node i, z i,j,t is the line switch status value, is whether the power distribution room node i is in the fault area at time t, f i,i,t is the starting point of the power supply area restoration path, Ω S and Ω DG are the substation set and the distributed power source node set respectively, f i,j,t is the restoration path from the power distribution room node i to j, and N is the total number of distribution network nodes.

[0091] Specifically, the specific steps for constructing the emergency repair resource scheduling model according to the distribution network fault data are as follows:

[0092] (1) Emergency drainage truck operation model:

[0093] Due to the insufficient drainage capacity in areas such as substations and power distribution rooms in the urban distribution network, flood disasters will cause the grid facilities to be flooded with water, and the pumping operation needs to be completed by the emergency drainage truck before the repair operation of the affected equipment can be carried out. The emergency drainage truck operation model constructed by the present invention is:

[0094]

[0095] In formulas (1) and (2), the flooded area S of the substation or power distribution room node i i and the water depth h i, the unit time-step flow rate Q of the emergency drainage vehicle d d , the access status value of the emergency drainage vehicle d at time step τ And the time step t of the drainage operation is the input of the emergency drainage vehicle operation model, and the completion time of the drainage operation As an intermediate transition state variable, the available state variable after drainage Is the output. The steps to implement the drainage operation using this model:

[0096] 1. Input parameters: S i , h i , Q d , t;

[0097] 2. Calculate the completion status value of the drainage operation: Use formula (1) to calculate the completion status value of the drainage operation of each node i at time step t If the total drainage volume of the drainage vehicle is greater than or equal to the accumulated water volume, then Indicates that the drainage operation is completed; otherwise,

[0098] 3. Calculate the available state value after drainage: Use formula (2) to calculate the available state value after drainage of each node i at time step t

[0099] 4. Output the result: The completion situation of the drainage operation

[0100] (2) Repair construction team operation model:

[0101] When the drainage of the affected substation and power distribution room is completed, the flooded power grid facilities can undergo repair operations such as flushing, drying, and replacement. After the affected equipment is repaired, it is put into normal use. In existing research, the repair operation process of the construction team is mainly represented by the fault repair time constant. However, due to the difference in the repair efficiency of different construction teams, the repair time will change, and the constant repair time constant cannot handle the scenario of multiple construction teams jointly repairing a single fault point. Therefore, the present invention constructs a fault repair workload model. On the premise that the drainage is completed, the repair of a single or multiple construction teams is greater than or equal to the workload required for the fault point, indicating that the repair operation is completed:

[0102]

[0103] In formulas (3) and (4), the workload W required to complete the repair of fault point i i , the workload D completed by a single construction team per unit time step c , the completion status value of the fault point drainage And the start status value of the construction team's construction operation The input for the emergency repair construction team operation model, the completion time of the emergency repair operation As an intermediate state variable, the repair status value after the fault is repaired Is the output of the emergency repair construction team operation model. The steps to implement the emergency repair operation using this model are as follows:

[0104] 1. Drainage completed: First, ensure that the drainage work of the affected substation or distribution room has been completed;

[0105] 2. Evaluate the workload: Determine the workload W required for repairing each fault point i i , which includes evaluating the damage degree of the equipment and the required repair steps;

[0106] 3. Construction team allocation: According to the number of fault points and the efficiency of each construction team, allocate one or more construction teams to carry out the emergency repair operation, and the workload D completed by each construction team per time step c ;

[0107] 4. Emergency repair operation: The construction team starts the construction operation, and the status value is represented by . During the operation, continuously monitor the repair progress of each fault point;

[0108] 5. Judgment of repair completion: According to formula (3), judge whether the repair workload of each fault point reaches or exceeds the required workload W i . If it reaches, then indicates that the repair is completed; otherwise,

[0109] 6. Update the repair status value: According to formula (4), update the repair status value of each fault point This indicates whether the fault point has been repaired;

[0110] 7. Put into normal use: Once the repair status values of all fault points indicate that the repair is completed, the affected equipment can be put into normal use.

[0111] (3) Emergency vehicle scheduling model:

[0112] Although different types of emergency supplies have different uses, they all start from the warehouse after the start of the distribution network emergency repair, go to different fault points in turn to participate in the emergency repair process, and return to the starting point after completing the distribution network repair task. The scheduling processes of different emergency supplies are similar and can be uniformly modeled as a general emergency vehicle scheduling model including travel time:

[0113] A single emergency vehicle can be connected to at most one location point at the same time:

[0114]

[0115] The relationship between the dispatching variables and the access status values of emergency vehicles is as follows:

[0116]

[0117] After the emergency vehicle departs from the warehouse starting point, the dispatching route and travel time of the emergency vehicle at two location points can be expressed as:

[0118]

[0119]

[0120] The inputs of the model are the emergency vehicle information (dispatching status values of drainage trucks and construction teams ), the warehouse starting point information (initial positions E of drainage trucks and construction teams), the travel time information (travel time tr at different positions i,j ), and the dispatching and time constraints (Formulas (5)-(8)); the outputs of the model are the dispatching plans, commissioning status values, and optimized paths of each emergency vehicle, specifically manifested as the access positions, movement status values, and optimal path planning of the vehicle at different time points. The steps to implement emergency resource dispatching using this model are:

[0121] 1. Model initialization: Input the emergency vehicle, warehouse starting point, and travel time information, and set the dispatching and time constraints as shown in Formulas (5)-(8);

[0122] 2. Optimized path planning: Based on the above constraints, optimize the dispatching plan of each emergency vehicle, and determine the access positions, movement status values, and optimal path planning of the vehicle at different time points;

[0123] 3. Output the dispatching plan: Output the dispatching plans, commissioning status values, and optimized paths of each emergency vehicle, specifically manifested as the access positions, movement status values, and optimal path planning of the vehicle at different time points.

[0124] Specifically, after constructing the repair resource dispatching model, the present invention also constructs a fault isolation and power supply area division model. Combining the fault isolation strategy, it divides the power supply area and the fault area to ensure the effective isolation of the fault area and the normal power supply of the non-fault area. The specific steps are as follows:

[0125] Construction of the fault area division model:

[0126] When a power distribution network equipment failure is caused by a flood disaster, it is necessary to isolate the fault node through switch operations. At the same time, according to the fault isolation situation, the power distribution network can be divided into a fault area and a power supply area. Please refer to Figure 2, is a schematic diagram of faults and power supply areas in the distribution network. In the fault area, due to the influence of system fault nodes, power sources such as distributed power sources in this area cannot operate normally, and the fault state will spread along the line until it is isolated by switches. In the power supply area, it can be directly powered by a substation, or a distributed power source forms an island microgrid to provide power support for important loads.

[0127] (1) Fault area:

[0128] When a fault occurs at a distribution substation node in the distribution network due to a flood disaster, it will cause the fault impact to spread in the power grid topology until it is isolated by a line switch, and the load in the fault area cannot be restored.

[0129] The area where the fault node is located before it is repaired is the fault state:

[0130]

[0131] In addition, the fault state will spread within the closed line. To reduce the scope of the fault area, it is necessary to isolate the fault propagation through switch operations. The fault isolation model is as follows:

[0132]

[0133] In formulas (9)-(11), the fault state value of node i repair state value and the line switch state value z i,j,t are the inputs of the fault isolation model, and whether node i is in the fault area at time t is the output.

[0134] Steps to implement fault isolation using this model:

[0135] 1. Detect the fault node: First, the system detects that a fault occurs at a certain node i, that is

[0136] 2. Determine the fault area: According to formula (9), determine whether node i is in the fault area. If node i has not been repaired (i.e., ), then indicates that node i is in the fault area;

[0137] 3. Isolate the fault propagation: By operating the line switch z i,j,t , disconnect the line connected to the fault node to prevent the fault state from spreading to other nodes. Specifically, when z i,j,t = 0, the fault states of nodes i and j are not related, thus isolating the fault;

[0138] 4. Repair the fault node: After the fault node is repaired, update the repair state value Recalculate the status value of the fault area according to the model To determine whether the fault area has been eliminated

[0139] (2) Power supply area:

[0140] Assume that the distributed power sources connected to the distribution network have black start capabilities. Then, in the power supply area, a restoration path starting from a substation or a distributed power source can be established to provide power support for important loads and reduce power outage losses

[0141] The restoration path can start from a substation node that can operate normally:

[0142]

[0143] Distributed power source nodes located in the non-fault area can also be used as the starting point of the restoration path:

[0144]

[0145] There can be at most one restoration path on a closed line:

[0146]

[0147] There can be a restoration path outflow only when there is a restoration path inflow to the distribution network node:

[0148]

[0149] When the distribution network is restored, a tree structure needs to be maintained, and radial constraints are used to ensure that each node can have at most one upstream node of the restoration path:

[0150]

[0151] When there is a restoration path inflow to the distribution network node and it is not located in the fault area, the node can be restored:

[0152]

[0153] In formulas (12)-(18), f i,i,t is 1 indicating the starting point of the restoration path, Ω S and Ω DG are the sets of substation and distributed power source nodes respectively, f i,j,t is the restoration path from node i to j, and N is the total number of distribution network nodes. When choosing whether to use a substation node or a distributed power source node as the starting point of the restoration path, the following factors need to be considered:

[0154] 1. Fault status: According to formulas (12) and (13), if the substation node is in a fault state Then it cannot be used as the starting point of the restoration path. Similarly, if the distributed power source node is within the fault area it also cannot be used as the starting point of the restoration path;

[0155] 2. Availability: If both the substation node and the distributed power source node are in a non-fault state, it is necessary to evaluate their availability and reliability. Substations usually have higher power output and stability, while distributed power sources may have black start capabilities and can quickly restore power supply after a power outage;

[0156] 3. Network topology: Considering the topology of the distribution network, select the node that can most effectively cover important loads as the starting point. Substations are usually located in the central position of the network and can cover a wider area, while distributed power sources may be located at the edge of the network and are suitable for local restoration;

[0157] 4. Complexity of the restoration path: According to formulas (14) and (15), the establishment of the restoration path needs to consider the closed state of the lines and the inflow and outflow relationships of the path. Select the node that can simplify the establishment and management of the restoration path as the starting point.

[0158] S3. According to the emergency drainage vehicle operation model, the emergency repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model, with the goal of maximizing the load restoration volume during the distribution network fault repair process, construct the objective function and corresponding constraint conditions for the distribution network fault repair;

[0159] Preferably, the constraint conditions include: distributed power output constraint, node load constraint, line power flow constraint, node power constraint, and node voltage constraint;

[0160] The distributed power output constraint is:

[0161]

[0162] Wherein, and are the active scheduling output and reactive scheduling output of the distributed power source respectively, and are the maximum output ranges of the units;

[0163] The node load constraint is:

[0164]

[0165] Wherein, is the node load restoration volume, is the maximum load demand value of the node load;

[0166] The line power flow constraint is:

[0167]

[0168] Among them, P i,j,t and Q i,j,t are the active power flow and reactive power flow on the distribution substation node i-j respectively, and are the maximum line capacities;

[0169] The node power constraint is:

[0170]

[0171] Among them, k i,t is the node load power factor;

[0172] The node voltage constraint is:

[0173]

[0174] Among them, U i,t is the node voltage, R i,j and X i,j are the resistance coefficient and reactance coefficient of the line respectively, U i and are the minimum range and maximum range of the voltage respectively;

[0175] The objective function is:

[0176]

[0177] Among them, ρ i is the load weight of the distribution substation node i.

[0178] Specifically, the present invention establishes a distribution network fault repair scheduling optimization model. Based on the distribution network operation constraints, with the maximum load restoration amount as the goal, a repair scheduling optimization model is constructed and linearized into a mixed integer linear programming (MILP) form to improve the solution efficiency.

[0179] (1) Distribution network operation model:

[0180] The distribution network operation model needs to model the constraints such as the output of distributed power sources, line power flow, and node voltage in the distribution network:

[0181] During the distribution network restoration process, the distributed power sources in the power supply area can be used to provide power support for important loads:

[0182]

[0183] In the formula: and represent the active and reactive power dispatch outputs of the distributed power sources, and is the maximum output range of the unit.

[0184] After the distribution network node is restored, the load at this node can be restored and powered, and it needs to be within the maximum load limit:

[0185]

[0186] In the formula: represents the load restoration amount of the node, is the maximum load demand value of this load.

[0187] For the line power flow, there is line power only when there is a restoration path on the line, and it cannot exceed the line power flow capacity:

[0188]

[0189] In the formula: P i,j,t and Q i,j,t respectively represent the active and reactive power flows on line i-j, and represent the maximum capacity of the line.

[0190] During the restoration process of the distribution network, for the line nodes, it is necessary to ensure the balance of active and reactive power:

[0191]

[0192] In the formula: k i,t represents the node load power factor.

[0193] During the restoration process of the distribution network, for the line nodes, it is necessary to ensure the voltage balance and the voltage must be within the deviation range:

[0194]

[0195]

[0196] In the formula: U i,t represents the node voltage, R i,j and X i,j respectively represent the line resistance and reactance coefficients, U i and respectively represent the minimum and maximum ranges of the voltage.

[0197] (2) Objective function:

[0198] During the emergency repair process of the urban distribution network under flood disasters, by dispatching various types of emergency resources such as emergency drainage vehicles and emergency repair construction teams, and adjusting the operation mode of the distribution network, it is used to accelerate the repair speed of the distribution network and reduce load losses. Its decision-making goal is to maximize the weighted load restoration amount during the emergency repair process, and the objective function is as follows:

[0199]

[0200] In the formula: ρ i represents the load weight of node i.

[0201] S4. Solve the objective function under the constraints of the above-mentioned constraints. When the load restoration amount during the emergency repair process of the distribution network is maximized, obtain the dispatching path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the dispatching path of the emergency repair construction team, the time arrangement of the emergency repair construction team, the fault isolation plan, and the power supply area restoration path. Then, based on the dispatching path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the dispatching path of the emergency repair construction team, the time arrangement of the emergency repair construction team, the fault isolation plan, and the power supply area restoration path, carry out emergency repair on the distribution network.

[0202] Specifically, by constructing an emergency drainage vehicle operation model, an emergency repair construction team operation model, an emergency vehicle dispatching model, a fault area division model, and a distribution network operation model (constraints of the objective function), and at the same time, according to the steps of the above models, solve the objective function with the goal of maximizing the load restoration amount during the emergency repair process of the distribution network, and obtain the dispatching path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the dispatching path of the emergency repair construction team, the time arrangement of the emergency repair construction team, the fault isolation plan, and the power supply area restoration path, specifically:

[0203] Optimal emergency repair resource dispatching plan: including the optimal dispatching path and time arrangement of the emergency drainage vehicle and the emergency repair construction team to ensure the efficient utilization of emergency repair resources;

[0204] Fault isolation and power supply area division plan: ensure that the fault area is effectively isolated, the non-fault area can be normally powered, and the load loss is reduced;

[0205] Maximum weighted load restoration amount: Under the condition of meeting the operation constraints of the distribution network, maximize the weighted load restoration amount during the emergency repair process to ensure the priority restoration of important loads;

[0206] Specific outputs: emergency repair resource dispatching plan, fault isolation and power supply area division diagram, load restoration situation, optimized target value.

[0207] Finally, according to the solution results of the objective function (the dispatching path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the dispatching path of the emergency repair construction team, the time arrangement of the emergency repair construction team, the fault isolation plan, and the power supply area restoration path), the fault repair of the distribution network is carried out.

[0208] Finally, through simulation verification on the improved IEEE 33-node distribution network system, the effectiveness of the proposed method in improving the repair efficiency and the amount of restored load is proved.

[0209] In a specific embodiment, the present invention tests and verifies the above process on the improved IEEE-33 system. Please refer to Figure 3 , which is the topology diagram of the test system. 101-104 are the substation buses, K1-K6 are the line switches, and three distributed power sources are located at nodes 5, 22, and 31 respectively. Affected by the flood disaster, there are 2 substations and 4 distribution substations at nodes in the distribution network that are flooded and malfunction, and it is assumed that the flooding degree and repair workload at different fault locations are known. In order to realize the power outage restoration of the urban distribution network, 2 emergency drainage vehicles and 3 groups of emergency repair construction teams are deployed for rapid repair. The entire restoration process is assumed to be 7.5 hours, divided into 15 time steps, each time step being 30 minutes.

[0210] The rapid restoration scheduling method for the distribution network under flood disasters proposed by the present invention uses emergency material vehicles such as drainage vehicles and construction teams in coordination to quickly repair faulty equipment and reduce the system power outage loss. Please refer to Figure 4 , which is a schematic diagram of the dispatching scheme for different types of emergency material vehicles. The operation times of the drainage vehicle and the construction team are represented by differently colored squares, the symbol "→" indicates that the emergency material vehicle is on the move, and the gray squares indicate the vehicle waiting time or the completion of the operation and withdrawal from the repair process.

[0211] According to the fault repair process of the distribution network under flood disasters, it is first necessary to drain the waterlogged areas affected by the disaster before carrying out repair operations on the power grid facilities. Drainage trucks #1 and #2 first depart from the starting point and reach the distribution substations at nodes N33 and N25 respectively, and complete the drainage operation at t = 3. Subsequently, construction teams #1 and #2 can start repairing N33 and N25. Among them, due to the incomplete drainage, construction team #2 waited for one time step. After that, construction teams #1 and #2 completed the fault repair at t = 4 and t = 5 time steps respectively. Drainage trucks #1 and #2 then went to node N26 and node N7 respectively. When the drainage operations were completed respectively, construction team #2 completed the repair of N7 at t = 8. Construction team #3 was used to repair node N26 and did not complete the repair until t = 9. Subsequently, drainage trucks #1 and #2 were respectively dispatched to N12 and N11. At the same time, construction team #1 waited for the drainage to be completed and then started the repair operation of N12, and did not complete the repair until t = 10. After that, construction team #2 started repairing node N11 at t = 9 time step, and construction team #3 started repairing node N11 at t = 10 time step. Finally, construction teams #2 and #3 jointly repaired N11 and completed the operation at t = 12 time step.

[0212] According to the scheduling plan of the drainage trucks and construction teams, the distribution network reduces the load loss by adjusting the switch status to isolate faults and construct island microgrids. The action status of the distribution network line switches is shown in Table 1. Four time steps of t = 2, t = 4, t = 7, and t = 11 are selected as typical time sections. Please refer to Figure 5 , which is a schematic diagram of the restoration process of the distribution network.

[0213]

[0214] Table 1 Action status of line switches

[0215] When the distribution network is affected by flood disasters and multiple faults occur, the load in the fault area cannot be restored normally and the distributed power sources cannot operate normally. At the same time, the fault area will expand with the propagation of the line. To reduce the impact of the fault area, the line switches will immediately disconnect to isolate the fault. As Figure 5 (a) and Table 1 show, the distributed power source DG1 is located in the fault area and cannot operate. 8 line switches are all disconnected to prevent the fault from affecting other feeders. For the load in the non-fault area, power support can be provided through substation emergency support or distributed power sources to ensure the power supply of important loads. For example, nodes 1-3 and 14-18 are provided with power support by the normally operating substations S1 and S2; nodes 29-31 build an island microgrid through the output of the distributed power source DG3 to reduce the power outage loss of important loads.

[0216] When the repair of step N33 is completed at t = 4, the line switch K7 closes, and the load demand of nodes 29 - 33 is transferred to substation S3 through the closing of the tie-line switch K5. The operation state of the distribution network is as Figure 5 (b) shown. When the repair of the fault node N25 is completed at t = 7, the line switch K8 closes, and the load demand of nodes 19 - 25 is transferred to substation S4 through the closing of switch K8. The operation state of the distribution network is as Figure 5 (c) shown. When the repairs of faults N7 and N12 are completed at t = 11, switch K1 closes to connect nodes 4 - 9 to substation S1. The operation state of the distribution network is as Figure 5 (d) shown. When all the fault nodes are repaired, switches K1, K4, and K6 are opened to reduce the load loss caused by line capacity limitations and ensure open-loop operation.

[0217] To illustrate the influence of different types of emergency supplies on the repair and restoration effect of distribution network faults under flood disasters, in this section, two other restoration methods are used to compare with the method proposed in the present invention in terms of the restoration effect. The two restoration methods do not consider fault repair and distributed power sources respectively. Please refer to Figure 6 , which is the load restoration schematic diagram of three different restoration methods.

[0218] For the method that does not consider fault repair, since there is a lack of drainage trucks and construction teams to repair the damaged components in the distribution network, the power-off load in the fault area cannot be restored normally, and the load restoration amount cannot reach 100%. For the method that does not consider distributed power sources, since DG2 and DG3 can provide power support and build island microgrids in the non-fault areas, when the distributed power sources are lacking to provide power support for important loads, the load loss during the restoration process of this method increases significantly. Finally, from the analysis of the comparison results of the three methods, it can be concluded that the fault repair scheduling method of coordinating multiple types of emergency supplies proposed in the present invention can effectively coordinate drainage trucks and construction teams, and utilize the distributed power sources to provide power support, effectively accelerating the fault restoration speed of the distribution network and reducing the load loss.

[0219] Embodiment 2

[0220] Please refer to Figure 7 , which is the structural schematic diagram of a distribution network fault repair device provided by an embodiment of the present invention. The device includes: a distribution network fault data acquisition module, a distribution network fault repair model construction module, an objective function construction module, and a distribution network fault repair module;

[0221] The distribution network fault data acquisition module is used to acquire distribution network fault data; among them, the distribution network fault data includes: the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access state value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the state value of the construction team starting construction operations, emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions;

[0222] The distribution network fault repair model construction module is used to construct an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for distribution network fault repair according to the distribution network fault data;

[0223] The objective function construction module is used to construct the objective function and corresponding constraint conditions for distribution network fault repair with the goal of maximizing the load restoration amount during the distribution network fault repair process according to the emergency drainage vehicle operation model, the repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model;

[0224] The distribution network fault repair module is used to solve the objective function under the constraints of the constraint conditions to obtain the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, the power supply area restoration path, and the maximum load restoration amount when the load restoration amount during the distribution network fault repair process is the largest. Then, according to the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area restoration path, the distribution network is repaired for faults.

[0225] It should be noted that the device embodiments described above are only illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement without creative labor.

[0226] Those skilled in the art can clearly understand that for the convenience and conciseness, the specific working process of the device described above can refer to the corresponding process in the foregoing method embodiments, and will not be elaborated here.

[0227] Embodiment III

[0228] Correspondingly, an embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the method for repairing a distribution network fault under a flood disaster described in the above-mentioned embodiment of the invention is implemented.

[0229] The electronic device may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The device may include, but is not limited to, a processor and a memory.

[0230] The so-called processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc. The processor is the control center of the device, and connects various parts of the entire device through various interfaces and lines.

[0231] Embodiment IV

[0232] Correspondingly, an embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program runs, the device where the storage medium is located is controlled to execute the method for repairing a distribution network fault under a flood disaster described in the above-mentioned embodiment of the invention.

[0233] The memory can be used to store the computer program. By running or executing the computer program stored in the memory and invoking the data stored in the memory, the processor realizes various functions of the device. The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include high-speed random access memory, and can also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

[0234] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0235] The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A method for emergency repair of distribution network faults under flood disasters, characterized in that, Including: Obtaining distribution network fault data; wherein, the distribution network fault data includes: the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access status value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the status value of the construction team starting construction work, emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions; According to the distribution network fault data, constructing an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for distribution network fault repair; According to the emergency drainage vehicle operation model, the repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model, with the goal of maximizing the load recovery amount during the distribution network fault repair process, constructing an objective function and corresponding constraint conditions for distribution network fault repair; Under the constraints of the constraint conditions, solving the objective function to obtain the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area recovery path when the load recovery amount during the distribution network fault repair process is the largest. Then, according to the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the repair construction team, the time arrangement of the repair construction team, the fault isolation plan, and the power supply area recovery path, carrying out fault repair on the distribution network.

2. The method for emergency repair of distribution network faults under flood disasters as described in claim 1, wherein, The constructing an emergency drainage vehicle operation model, a repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for distribution network fault repair according to the distribution network fault data includes: According to the distribution network fault data, using the flooded area of the distribution substation, the water depth of the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access status value of the emergency drainage vehicle at the time step, and the time step of the emergency drainage vehicle for drainage operation as inputs, and using the available status value of the distribution substation after drainage as the output, constructing an emergency drainage vehicle operation model for distribution network fault repair; According to the distribution network fault data, using the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the status value of the construction team starting construction work, and the available status value of the distribution substation after drainage as inputs, and using the repair status value of the distribution substation after fault repair as the output, constructing a repair construction team operation model for distribution network fault repair; According to the distribution network fault data, using the emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions as inputs, and using the scheduling plan of each emergency vehicle as the output, constructing an emergency vehicle scheduling model for distribution network fault repair; According to the distribution network fault data, using the fault status values of each distribution substation node, the total number of distribution substation nodes, the substation set of the distribution network, and the distributed power source set of the distribution network as inputs, and using the fault isolation plan for the fault area and the recovery path of the power supply area as the output, constructing a fault area division model for distribution network fault repair.

3. The method for emergency repair of distribution network faults under flood disasters according to claim 2, wherein The emergency drainage vehicle operation model is: Among them, S i is the flooded area of the distribution substation node i, h i is the water accumulation depth of the distribution substation node i, Q d is the unit time-step flow rate of the emergency drainage vehicle d, is the access status value of the emergency drainage vehicle d at the time step τ, t is the time step of the drainage operation, is the completion time of the drainage operation, is the available state variable after the distribution substation is drained.

4. The method for repairing faults in a distribution network under flood disasters according to claim 3, characterized in that, The operation model of the emergency repair construction team is as follows: Among them, W i is the workload required to complete the repair of the distribution substation node i, D c is the workload completed by a single construction team per time step, is the status value when the construction team starts construction operations, is the completion time of the emergency repair operation, is the repair status value after the distribution substation fault is repaired.

5. The method for emergency repair of distribution network faults under flood disasters according to claim 4, characterized in that The emergency vehicle scheduling model is as follows: Among them, is the emergency vehicle information within the dispatching area d / c, E is the initial positions of the drainage trucks and construction teams, tr i,j is the vehicle moving time required from the power distribution room node i to the power distribution room node j.

6. The method for emergency repair of distribution network faults under flood disasters according to claim 5, characterized in that, The fault area division model is as follows: Among them, is the fault status value of substation node i, the repair status value of substation node i, z i,j,t is the line switch status value, is whether substation node i is in the fault area at time t, f i,i,t is the starting point of the power supply area restoration path, Ω S and Ω DG are the substation set and the distributed power generation node set respectively, f i,j,t is the restoration path from substation node i to j, and N is the total number of distribution network nodes.

7. The method for emergency repair of distribution network faults under flood disasters according to claim 6, characterized in that, The constraint conditions include: distributed power generation output constraint, node load constraint, line power flow constraint, node power constraint, and node voltage constraint; The distributed power generation output constraint is as follows: Among them, and are the active power dispatch output and the reactive power dispatch output of the distributed power source respectively, and are the maximum output ranges of the units; The node load constraint is as follows: Among them, is the node load recovery amount, is the maximum load demand value of the node load; The line power flow constraint is as follows: Among them, Pi ,j,t and Q i,j,t are the active power flow and reactive power flow on the distribution substation node i-j respectively, and are the maximum line capacities; The node power constraint is as follows: where k i,t is the node load power factor; The node voltage constraint is as follows: Among them, U i,t is the node voltage, R i,j and X i,j are the resistance coefficient and reactance coefficient of the line respectively, U i and are the minimum range and maximum range of the voltage respectively; The objective function is as follows: Among them, ρ i is the load weight of distribution substation node i.

8. A distribution network fault repair device under flood disasters, characterized in that, It includes: A distribution network fault data acquisition module, a distribution network fault emergency repair model construction module, an objective function construction module, and a distribution network fault emergency repair module; The distribution network fault data acquisition module is used to acquire distribution network fault data; among them, the distribution network fault data includes: the flooded area of the distribution substation, the water depth in the distribution substation, the unit time-step flow rate of the emergency drainage vehicle, the access status value of the emergency drainage vehicle at the time step, the time step of the emergency drainage vehicle for drainage operation, the workload required for repairing the fault point, the workload completed by a single construction team per unit time step, the status value of the construction team starting construction work, emergency vehicle information, the initial position of the drainage vehicle, the initial position of the construction team, and the vehicle movement time required for different positions; The distribution network fault emergency repair model construction module is used to construct an emergency drainage vehicle operation model, an emergency repair construction team operation model, an emergency vehicle scheduling model, and a fault area division model for distribution network fault emergency repair according to the distribution network fault data; The objective function construction module is used to construct the objective function and the corresponding constraint conditions for distribution network fault emergency repair with the goal of maximizing the load restoration amount during the distribution network fault emergency repair process according to the emergency drainage vehicle operation model, the emergency repair construction team operation model, the emergency vehicle scheduling model, and the fault area division model; The distribution network fault emergency repair module is used to solve the objective function under the constraints of the constraint conditions to obtain the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the emergency repair construction team, the time arrangement of the emergency repair construction team, the fault isolation plan, the power supply area restoration path, and the maximum load restoration amount when the load restoration amount during the distribution network fault emergency repair process is the largest, and then perform fault emergency repair on the distribution network according to the scheduling path of the emergency drainage vehicle, the time arrangement of the emergency drainage vehicle, the scheduling path of the emergency repair construction team, the time arrangement of the emergency repair construction team, the fault isolation plan, and the power supply area restoration path.

9. An electronic device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the distribution network fault emergency repair method under flood disasters as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium includes a stored computer program. When the computer program runs, it controls the device where the storage medium is located to execute the distribution network fault emergency repair method under flood disasters as described in any one of claims 1 to 7.

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