Power distribution network fault recovery method, computer program product, and electronic device

Abstract

The application provides a power distribution network fault recovery method, a computer program product and an electronic device, the method comprising: acquiring power distribution network data at a fault time; acquiring meteorological data of a location of the power distribution network during fault recovery; constructing a light-storage-charging integrated power station model according to the meteorological data and determining a total adjustable power interval thereof; drawing a moving track of a meteorological disaster according to the meteorological data and determining a moving speed of the meteorological disaster, dividing the fault recovery period according to the moving speed to obtain a plurality of time periods; reconstructing a network topology structure of the power distribution network in the time periods according to the power distribution network data to obtain a target topology structure; calculating a loop-inrush current according to the target topology structure and performing safety checking on the loop-inrush current; when the loop-inrush current does not pass the safety checking, adjusting the power of the light-storage-charging integrated power station according to the total adjustable power interval. The application solves the problem of low safety in the fault recovery process of the power distribution network in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a power distribution network fault recovery method, a computer readable storage medium, a computer program product and an electronic device. BACKGROUND

[0002] When a power distribution network fault caused by extreme weather disasters occurs, fast and effective fault recovery is an important means to improve the resilience of the power distribution network. Existing research on power distribution network fault recovery and resilience improvement mainly focuses on investment cost, network loss, switch action frequency, voltage fluctuation and power supply reliability indicators, and provides guidance for post-disaster power distribution network reconstruction by constructing a multi-objective optimization model. The fault recovery of power distribution network containing a high proportion of DGs is faced with the problems of DG output difference, randomness and load time variability, etc., which makes the traditional static power distribution network reconstruction scheme no longer applicable.

[0003] For faults caused by weather factors, existing research lacks consideration of the uncertainty of line faults under extreme disaster conditions, and the collaborative regulation method of multiple resources in the distribution network is more inclined to optimize the configuration, and lacks research on the multi-source collaborative regulation method after the fault. The adoption of multiple energy sources in collaboration and complementation is conducive to mitigating the disadvantage of large DG fluctuations in the fault recovery process, and the recovery method is more reasonable and reliable. The integrated photovoltaic, energy storage and electric vehicle station integrates multiple resources such as photovoltaic, energy storage and electric vehicle, has the advantages of intensiveness, in-station energy complementation and mitigation of electric vehicle load fluctuation, and is conducive to improving the safety, reliability, stability, economy and environmental protection of the power grid.

[0004] The existing technology pays less attention to the transient security of the power distribution network fault recovery scheme, and does not consider the transient changes of electrical quantities and their influence in the implementation process of fault recovery, resulting in low safety of the fault recovery of the power distribution network. SUMMARY

[0005] The main purpose of the present application is to provide a power distribution network fault recovery method, a computer readable storage medium, a computer program product and an electronic device, to at least solve the problem that the existing technology does not consider the transient changes of electrical quantities and their influence in the process of power distribution network fault recovery, resulting in low safety.

[0006] To achieve the above objectives, according to one aspect of this application, a fault recovery method for a distribution network is provided, comprising: acquiring distribution network data at the time of the fault, wherein the distribution network data includes distribution network structural parameters, distributed generation status parameters, load status parameters, unit cost of switching operations, and user power outage cost; the distribution network structural parameters include the branch connection status of the distribution network and corresponding geographical latitude and longitude information; the distributed generation status parameters include the output of distributed generation sources in the distribution network; the load status parameters characterize the power of node loads in the distribution network and the priority of the node loads; the unit cost of switching operations represents the cost incurred for each switching operation in the distribution network; the user power outage cost characterizes the economic loss suffered by users due to power supply interruption; and the time of the fault characterizes the moment when the distribution network fault occurs; acquiring meteorological data of the location of the distribution network during the fault recovery period, wherein the fault recovery period characterizes the period during which the distribution network is restored after the fault occurs; and constructing an integrated photovoltaic-storage-charging power station model based on the meteorological data, and determining... The total adjustable power range of the integrated photovoltaic-storage-charging power station model is defined. This model includes a photovoltaic power generation system model, an energy storage system model, and a charging station model. The total adjustable power range represents the total power range that the integrated photovoltaic-storage-charging power station can adjust within its operating range. Based on meteorological data, the movement trajectory of a meteorological disaster is plotted, and the movement speed of the disaster is determined based on the trajectory and the meteorological data. The fault recovery period is then divided into multiple different time periods based on the movement speed. Based on the distribution network data, the network topology of the distribution network within each time period is reconstructed to obtain a target topology. Based on the target topology, the loop-closing inrush current is calculated, and a safety check is performed on the loop-closing inrush current. The loop-closing inrush current represents the transient current generated when the target topology performs a loop-closing operation. If the loop-closing inrush current fails the safety check, the power of the integrated photovoltaic-storage-charging power station is adjusted according to the total adjustable power range to ensure that the loop-closing inrush current passes the safety check.

[0007] Optionally, based on the distribution network data, the network topology of the distribution network within the time period is reconstructed to obtain a target topology, including: determining the objective function based on the distribution network data. And determine the equality constraints as follows: Where ε is the set of lines in the distribution network, c′ ij and c ij c′ is a binary variable. ij c represents the open / closed state of line ij before reconstruction. ij This represents the open / closed state of line ij after reconfiguration, N is the set of node loads in the distribution network, and ω ibi is a load weight of the ith node load i Pi is a binary variable representing a charged state of the ith node load loadi Pi is a binary variable representing a charged state of the ith node load ij Pi is a binary variable representing a charged state of the ith node load ij Pi is a binary variable representing a charged state of the ith node load ij Pi is a binary variable representing a charged state of the ith node load ij Pi is a binary variable representing a charged state of the ith node load

[0008] Optionally, according to the target topology structure, a closed-loop impulse current is calculated, including: according to the target topology structure, impedance of a passive loop network is simplified as a series circuit, in which a resistor R and an inductor L are connected in series, the passive loop network representing a network topology part of the target topology structure that does not contain a power supply; and the closed-loop impulse current is determined as

[0009]

[0010] wherein, τ1=L / R, i(t) represents the closed-loop impulse current at time t, I m is a steady-state current amplitude of the target topology structure after the loop closing, U2 is a voltage amplitude of a first end of a loop closing point, U3 is a voltage amplitude of a second end of the loop closing point, δ2 is a voltage phase angle of the first end of the loop closing point, δ3 is a voltage phase angle of the second end of the loop closing point, τ1 is a decay constant, t0 is a time when the target topology structure performs the loop closing operation, and ω is an angular frequency.

[0011] Optionally, the closed-loop impulse current is safety checked, including: determining whether the closed-loop impulse current satisfies a first condition, the first condition being i(t) max ≤I l，max wherein, i(t) max is a maximum value of the closed-loop impulse current, I l，maxThe preset line maximum allowable current represents a maximum current value allowed to pass through a line in the target topology; in a case where the loop-inrush current does not satisfy the first condition, it is determined that the loop-inrush current fails the safety check; in a case where the loop-inrush current satisfies the first condition, it is determined that the loop-inrush current passes the safety check.

[0012] Optionally, adjusting the power of the integrated optical storage and charging power station according to the total adjustable power interval so that the loop-inrush current passes the safety check comprises: adjusting the power of the integrated optical storage and charging power station according to the total adjustable power interval so that U2 and U3 satisfy a second condition, the second condition being wherein,

[0013] Optionally, constructing an integrated optical storage and charging power station model according to the meteorological data and determining a total adjustable power interval of the integrated optical storage and charging power station comprises: establishing a photovoltaic power generation system model according to the meteorological data and determining an adjustable power interval of the photovoltaic power generation system; establishing a storage system model according to the meteorological data and determining an adjustable power interval of the storage system; establishing a charging station model according to the meteorological data and determining an adjustable power interval of the charging station; and determining the total adjustable power interval as wherein, the total adjustable power interval at t, the adjustable power interval of the photovoltaic power generation system at t, the adjustable power interval of the storage system at t, the adjustable power interval of the charging station at t.

[0014] Optionally, adjusting the power of the integrated optical storage and charging power station according to the total adjustable power interval comprises: determining whether a target adjustment power is located within the adjustable power interval of the storage system, the target adjustment power representing a power required to be adjusted so that the loop-inrush current passes the safety check; and adjusting the power of the storage system in a case where the target adjustment power is located within the adjustable power interval of the storage system.

[0015] According to another aspect of the present application, a computer readable storage medium is provided, which comprises a stored program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to execute any of the power distribution network fault recovery methods when the program is run.

[0016] According to still another aspect of the present application, there is provided a computer program product comprising computer instructions which, when executed by a processor, implement any of the power distribution network fault recovery methods.

[0017] According to yet another aspect of the present application, there is provided an electronic device comprising one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise instructions for implementing any of the power distribution network fault recovery methods.

[0018] By applying the technical solution of the present application, firstly, the power distribution network data at the fault time is acquired, and the meteorological data of the place where the power distribution network is located during the fault recovery is acquired, then according to the meteorological data, the light-storage-charging integrated power station model is constructed, and the total adjustable power interval of the light-storage-charging integrated power station model is determined, then according to the meteorological data, the moving track of the meteorological disaster is drawn, and the moving speed of the meteorological disaster is determined, according to the moving speed, the fault recovery period is divided into multiple different time periods, and according to the power distribution network data, the network topology structure of the power distribution network in the time period is reconstructed to obtain the target topology structure, then according to the target topology structure, the loop-inrush current is calculated, and the loop-inrush current is safety checked, when the loop-inrush current fails to pass the safety check, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop-inrush current passes the safety check. Compared with the prior art which does not consider the transient change of electrical quantity in the power distribution network fault recovery process and its influence, leading to low safety, the present application calculates the loop-inrush current according to the target topology structure, and safety checks the loop-inrush current, when the loop-inrush current fails to pass the safety check, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop-inrush current passes the safety check, that is, the transient safety problem in the switching process is considered, the utilization of the grid adjustable resource (i.e. the light-storage-charging integrated power station) is included in the fault recovery method, which is conducive to ensuring that the safety of the power distribution network fault recovery process is high; in addition, by combining the moving track of the meteorological disaster obtained by the meteorological data, the spatio-temporal evolution characteristics of the power distribution network fault under extreme meteorological disasters are considered, which ensures that the adaptability to the meteorological disaster caused by extreme weather is good. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of the present description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings are provided to explain embodiments of the present application and not to limit the present application. In the drawings:

[0020] Figure 1A hardware structure block diagram of a mobile terminal for performing a power distribution network fault recovery method is shown according to an embodiment of the present application;

[0021] Figure 2 A flowchart of a power distribution network fault recovery method is shown according to an embodiment of the present application;

[0022] Figure 3 An internal component structure diagram of a light storage and charging integrated power station is shown according to an embodiment of the present application;

[0023] Figure 4 A power distribution network diagram including a light storage and charging integrated power station is shown according to an embodiment of the present application.

[0024] Among the above drawings, the following reference signs are included:

[0025] 102, processor; 104, memory; 106, transmission device; 108, input and output device. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] As described in the background section, the prior art does not take into account the transient changes in electrical quantities and their impact during the fault recovery process of the distribution network, resulting in low safety. To solve the above problems, embodiments of this application provide a fault recovery method for the distribution network, a computer-readable storage medium, a computer program product, and an electronic device.

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a power distribution network fault recovery method according to an embodiment of the present invention. (See diagram below.) Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0032] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as the computer program corresponding to the power distribution network fault recovery method in the embodiments of the present application. The processor 102 can execute various functional applications and data processing, i.e., implement the above method, by running the computer program stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a nonvolatile memory, such as one or more magnetic storage devices, flash memories, or other nonvolatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, and the remote memory can be connected to the mobile terminal through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data through a network. The specific examples of the network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0033] In the embodiments, a power distribution network fault recovery method running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 2 is a flowchart of the power distribution network fault recovery method according to the embodiments of the present application. As shown in Figure 2 , the method includes the following steps:

[0035] In step S201, power distribution network data at a fault time is acquired, the power distribution network data including power distribution network structure parameters, distributed power supply state parameters, load state parameters, switch action unit cost, and user power failure cost, the power distribution network structure parameters including branch connection conditions of the power distribution network and corresponding geographic latitude and longitude information, the distributed power supply state parameters including output size of distributed power supply in the power distribution network, the load state parameters representing power of node load in the power distribution network and priority conditions of the node load, the switch action unit cost representing cost generated by each time of performing switch operation in the power distribution network, and the user power failure cost representing economic loss brought to users due to power supply interruption, and the fault time representing a time when the power distribution network fails;

[0036] In step S202, meteorological data of a place where the power distribution network is located during a fault recovery period is acquired, the fault recovery period representing a period during which the power distribution network is recovered after the power distribution network fails.

[0037] In step S203, according to the meteorological data, a light-storage-charging integrated power station model is constructed, and total adjustable power interval of the light-storage-charging integrated power station model is determined, the light-storage-charging integrated power station model including a photovoltaic power generation system model, an energy storage system model, and a charging station model, and the total adjustable power interval representing total power interval that can be adjusted by the light-storage-charging integrated power station in an operating range.

[0038] In step S204, a moving track of a meteorological disaster is drawn according to the meteorological data, and a moving speed of the meteorological disaster is determined according to the moving track and the meteorological data, and the fault recovery period is divided into different time periods according to the moving speed.

[0039] In step S205, according to the power distribution network data, network topology structure of the power distribution network in the time periods is reconstructed to obtain a target topology structure.

[0040] In step S206, according to the target topology structure, a loop closing impact current is calculated, and the loop closing impact current is safety checked, the loop closing impact current representing transient current generated when the target topology structure performs loop closing operation.

[0041] In step S207, in a case where the loop closing impact current does not pass the safety check, power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop closing impact current passes the safety check.

[0042] By the above embodiment, first, the power distribution network data at the fault time is acquired, and the meteorological data of the place where the power distribution network is located during the fault recovery is acquired, then according to the meteorological data, the light-storage-charging integrated power station model is constructed, and the total adjustable power interval of the light-storage-charging integrated power station model is determined, then according to the meteorological data, the moving track of the meteorological disaster is drawn, and the moving speed of the meteorological disaster is determined, according to the moving speed, the fault recovery period is divided to obtain a plurality of different time periods, and according to the power distribution network data, the network topology structure of the power distribution network in the time period is reconstructed to obtain a target topology structure, then according to the target topology structure, the loop closing impact current is calculated, and the loop closing impact current is safety checked, when the loop closing impact current does not pass the safety check, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop closing impact current passes the safety check. Compared with the prior art which does not consider the transient change of electrical quantity in the power distribution network fault recovery process and its influence, leading to low safety, the application calculates the loop closing impact current according to the target topology structure, and safety checks the loop closing impact current, when the loop closing impact current does not pass the safety check, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop closing impact current passes the safety check, that is, the transient safety problem in the switching process is considered, and the utilization of the grid adjustable resource (i.e. the light-storage-charging integrated power station) is included in the fault recovery method, which is beneficial to ensure that the safety of the power distribution network fault recovery process is high; in addition, by combining the moving track of the meteorological disaster obtained by the meteorological data, the spatio-temporal evolution characteristics of the power distribution network fault under extreme meteorological disasters are considered, and the adaptability to the meteorological disaster caused by extreme weather is good.

[0043] Specifically, for the fault caused by meteorological factors, meteorological data of the region can be acquired, specifically including wind speed, rainfall and irradiance, etc., and the spatio-temporal resolution of the meteorological data is 0.03°×0.03° / h.

[0044] Specifically, the plurality of time periods are continuous. For example, the length of the above fault recovery period is 3 hours, and the 3 hours can be divided into 3 different time periods, and the length of each time period is 1 hour.

[0045] In an optional solution, according to the above power distribution network data, the network topology structure of the above power distribution network in the above time period is reconstructed to obtain a target topology structure, including: according to the above power distribution network data, determining the target function as and determining the equality constraint condition as wherein ε is a line set in the above power distribution network, c' ij and c ij are binary variables, and c ij represents the open-close state of the line ij before reconstruction. ij, N is a set of node loads in the power distribution network, and ω i is a load weight of the i-th node load, b i is a binary variable, indicating the charging state of the i-th node load, P loadi is the active power of the i-th node load, Δt represents the duration of the fault, β1 represents the first weight, and β2 represents the second weight, P ij represents the active power of line ij, Q ij represents the reactive power of line ij, U ij represents the voltage of line ij, I ij represents the current of line ij; according to the network structure constraint condition, the power distribution network operation constraint condition and the above equation constraint condition, the objective function is solved to minimize F1, and the target topology structure is obtained, wherein the network structure constraint condition represents the constraint condition of the network topology structure of the power distribution network, and the power distribution network operation constraint condition represents the constraint condition of the power distribution network in the operation process. In this embodiment, the objective function is established, and the objective function is solved according to the network structure constraint condition, the power distribution network operation constraint condition and the equation constraint condition, so as to minimize F1 (that is, to minimize the operation cost and maximize the important load power supply recovery rate), so as to ensure that the obtained target topology structure is better.

[0046] In actual application process, the first weight and the second weight can be set according to experience value by those skilled in the art, or can be obtained through multiple experiments, and the present application does not make specific limitation.

[0047] Specifically, within the spatio-temporal accuracy of available meteorological data, the moving track of meteorological disasters is drawn, the time period is divided according to the moving speed, the continuous reconstruction optimization of the power distribution network during fault recovery is carried out, and the reconstruction scheme is output. In order to realize the improvement of power grid resilience, the present application selects the weighted load equivalent recovery rate (i.e. ) and the total number of switch actions (i.e. ) during the fault recovery of the distribution network as the index of the recovery scheme, and constructs the objective function by assigning the corresponding cost weight (i.e. β1, β2).

[0048] Specifically, during the entire fault process, in order to maintain the safe and reliable operation of the power grid, the radial network constraint and the fault branch set constraint are selected as the network structure constraint, and the branch current safety constraint, the node voltage safety constraint, the power supply power constraint and the branch power transmission constraint are selected as the distribution network operation constraint. Among them, the radial network constraint: ensures that the distribution network maintains a radial structure, that is, radiates outward from a power supply point, and each node is connected to only one superior node to simplify network management and fault location; the fault branch set constraint: in the fault branch set, it needs to consider how to isolate the fault area through network reconstruction, while ensuring the power supply of the non-fault area; the branch current safety constraint: ensures that the current of all branches in the distribution network does not exceed the maximum allowable value to prevent overload and equipment damage; the node voltage safety constraint: ensures that the voltage of all nodes in the distribution network is maintained within a safe range, neither below the minimum voltage requirement nor above the maximum voltage limit; the power supply power constraint: ensures that the output power of the power supply does not exceed its maximum available power, while also not lower than the minimum output requirement; the branch power transmission constraint: ensures that the power transmission of each branch in the distribution network does not exceed its thermal limit to ensure the safe operation of the equipment.

[0049] In other embodiments, according to the target topology structure, the closing-loop impulse current is calculated, including: simplifying the impedance of the passive loop network into a series circuit according to the target topology structure, in which the resistance R and the inductance L are connected in series, and the passive loop network represents the network topology part of the target topology structure that does not contain power supply; determining the closing-loop impulse current as

[0050] wherein, τ1=L / R, i(t) represents the closing-loop impulse current at time t, I m is the steady-state current amplitude of the target topology structure after closing-loop, U2 is the voltage amplitude of the first end of the closing-loop point, U3 is the voltage amplitude of the second end of the closing-loop point, δ2 is the voltage phase angle of the first end of the closing-loop point, δ3 is the voltage phase angle of the second end of the closing-loop point, τ1 is the decay constant, t0 is the time when the target topology structure performs the closing-loop operation, and ω is the angular frequency. In this embodiment, the closing-loop impulse current is calculated by using specific formulas, which ensures that the obtained closing-loop impulse current is relatively accurate, and ensures that the safety evaluation of the closing-loop operation is relatively accurate, thereby further ensuring that the safety of the distribution network fault recovery process is relatively high.

[0051] Specifically, the closing-loop power flow calculation is performed on the target topology structure to complete the safety check of the closing-loop impulse current. By constructing a closing-loop transient impulse equivalent model, the equivalent impedance Z eq of the passive loop network is simplified into a series circuit of R and L, and the closing-loop impulse current of the closing-loop branch can be solved.

[0052] In some optional solutions, the safety check on the closing impulse current comprises: determining whether the closing impulse current satisfies a first condition, the first condition being i(t) max ≤ I l，max , wherein i(t) max is the maximum value of the closing impulse current, and I l，max is a preset line maximum allowable current, the line maximum allowable current representing a maximum current value allowed to pass through a line in the target topology; in a case where the closing impulse current does not satisfy the first condition, it is determined that the closing impulse current fails the safety check; in a case where the closing impulse current satisfies the first condition, it is determined that the closing impulse current passes the safety check. In this embodiment, by comparing the maximum value of the closing impulse current with the preset line maximum allowable current, it can be ensured that the current passing through the line during the closing operation does not exceed the bearing limit of the line, thereby avoiding damage or safety accidents of the line caused by excessively large current. When it is determined that the closing impulse current fails the safety check, the power of the integrated optical storage and charging power station can be adjusted according to the total adjustable power interval, so as to meet the safety standard. Such adjustment helps to optimize the operation of the power grid and make it more efficient and safe during fault recovery.

[0053] Specifically, the maximum value i(t) max of the closing impulse current is the maximum instantaneous current of the line.

[0054] In some other optional solutions, the power of the integrated optical storage and charging power station is adjusted according to the total adjustable power interval, so that the closing impulse current passes the safety check, which comprises: the power of the integrated optical storage and charging power station is adjusted according to the total adjustable power interval, so that U2 and U3 satisfy a second condition, the second condition being wherein, In this embodiment, by adjusting the power of the integrated optical storage and charging power station, it is ensured that the voltages at both ends of the closing point satisfy the second condition, thereby further improving the safety of the distribution network during fault recovery.

[0055] Specifically, when the safety check fails, the closing initial phase angle is adjusted to suppress the closing impulse current, that is, to satisfy as much as possible. The voltages at both ends of the closing point should satisfy the second condition at this time. To adjust the closing initial phase angle to suppress the closing impulse current, the network power flow is changed by adjusting the power of the integrated optical storage and charging power station, so that the voltages at both ends of the closing point meet the requirements.

[0056] In some example embodiments, according to the above meteorological data, a light-storage-charging integrated power station model is constructed, and a total adjustable power interval of the light-storage-charging integrated power station model is determined, including: according to the above meteorological data, a photovoltaic power generation system model is established, and an adjustable power interval of the photovoltaic power generation system is determined; according to the above meteorological data, a storage system model is established, and an adjustable power interval of the storage system is determined; according to the above meteorological data, a charging station model is established, and an adjustable power interval of the charging station is determined; according to the above adjustable power interval of the photovoltaic power generation system, the above adjustable power interval of the storage system, and the above adjustable power interval of the charging station, the total adjustable power interval is determined as wherein, is the total adjustable power interval at t, is the adjustable power interval of the photovoltaic power generation system at t, is the adjustable power interval of the storage system at t, is the adjustable power interval of the charging station at t. In this embodiment, by separately modeling and determining the adjustable power intervals of the photovoltaic power generation system, the storage system and the charging station, these resources can be more effectively managed and allocated, and it is ensured that each energy source can be reasonably utilized during fault recovery.

[0057] Specifically, for the construction of the photovoltaic power generation system model, the photovoltaic output needs to be estimated in order to optimize the output curve. According to the power generation principle of solar cell photovoltaic effect, as well as the empirical formula and reasonable empirical coefficient of photoelectric conversion, when the solar radiation value is determined, the photovoltaic power generation output power can be calculated as: wherein, P PV (t) is the time-varying output of the photovoltaic power generation system, p is the temperature influence coefficient, generally -0.35% / °C~0.5% / °C, I s (t) is the time-varying solar radiation at the photovoltaic panel, A PV is the area of the photovoltaic panel, N PV is the number of photovoltaic panels in the photovoltaic power generation system, η PV is the rated photoelectric conversion efficiency, I STC is the irradiance intensity tested under standard conditions, I PV，s is the rated output of the photovoltaic system.

[0058] Specifically, for the construction of the storage system model, the real-time maximum charge-discharge power constraint of the storage system, the upper and lower limit constraints of the storage capacity, and the charge-discharge cycle process need to be considered. The charge-discharge model of the storage system in the light-storage-charging integrated power station is:

[0059]

[0060] wherein, Pch，t P is the charging active power at time t, dis，t Q is the discharging active power at time t, ch，t Q is the charging reactive power at time t, dis，t M is the discharging reactive power at time t, ESS E is the energy storage charging / discharging flag binary variable (0 represents discharging, 1 represents charging), t E is the remaining energy of the energy storage system at time t, Full S is the full energy of the energy storage system, max T is the capacity of the energy storage system, T is the length of each time period divided, and SOC t SOC is the state of charge of the energy storage device at time t.

[0061] Specifically, for the construction of the charging station (i.e. electric vehicle) model, the error of the electric vehicle number prediction and the random behavior of part of the users in the fault period need to be fully considered. According to the number of electric vehicles on the grid and the state of charge of the electric vehicle, the interval power P D,EV,t and the energy E D,EV,t that the charging station can participate in fault recovery at time t can be calculated: n EV，t P is the lower limit of the number of electric vehicles on the grid predicted, P is the upper limit of the number of electric vehicles on the grid predicted, P EV,i,t P is the lower limit of the charging and discharging active power of the i-th electric vehicle at time t, P is the upper limit of the charging and discharging active power of the i-th electric vehicle at time t, E EV,i,t E is the lower limit of the energy of the i-th electric vehicle at time t, E is the upper limit of the energy of the i-th electric vehicle at time t.

[0062] Specifically, P is the output interval of the photovoltaic power generation system, P is the output power interval of the energy storage system, P is the adjustable power interval of the EV (i.e. electric vehicle).

[0063] ​In some example embodiments, the power of the photovoltaic energy storage and charging integrated power station is adjusted according to the total adjustable power interval, including: determining whether the target adjustment power is within the adjustable power interval of the energy storage system, the target adjustment power representing the power needed to be adjusted to make the loop current pass the safety check; and adjusting the power of the energy storage system if the target adjustment power is within the adjustable power interval of the energy storage system. In this embodiment, by determining whether the target adjustment power is within the adjustable power interval of the energy storage system, it can be ensured that the adjustment operation is within a safe and feasible range, avoiding power adjustment beyond the adjustment capacity of the energy storage system, thereby protecting the energy storage system from being damaged.

[0064] Specifically, as shown in Figure 3 The photovoltaic energy storage and charging integrated power station includes a photovoltaic system (PV), an energy storage system (ESS), an electric vehicle (EV), and an energy management system. The energy management system is used to adjust the photovoltaic system, the energy storage system, and the electric vehicle. After a fault occurs in the power distribution network, the energy management system sends an instruction to stop the photovoltaic energy storage and charging integrated power station from providing charging services for electric vehicles. The photovoltaic system, the energy storage system, and the electric vehicle enter a standby state. Real-time information of each subsystem (i.e., the photovoltaic system, the energy storage system, and the electric vehicle) is collected through an information channel, and the adjustable power interval of the photovoltaic energy storage and charging integrated power station is calculated. Within the adjustable power interval of the photovoltaic energy storage and charging integrated power station, when the target adjustment power is within the adjustable interval of the energy storage system, the energy storage system is preferentially adjusted. When the power to be adjusted exceeds the upper limit of the adjustable power of the energy storage system, the photovoltaic system and the electric vehicle are further considered to support the charging power.

[0065] Specifically, Figure 3 The energy management system includes a station monitoring system, a PV monitoring system, an EV monitoring system, and an ESS monitoring system. The station monitoring system is used to monitor the load (i.e., node load) of the station, the PV monitoring system is used to monitor the photovoltaic system, the EV monitoring system is used to monitor the electric vehicle, and the ESS monitoring system is used to monitor the energy storage system. The energy management system collects real-time information of each subsystem (i.e., the photovoltaic system, the energy storage system, the electric vehicle, and the node load) through an information channel. Figure 3 In some example embodiments, AC / DC represents the conversion between alternating current and direct current.

[0066] Specifically, as shown in Figure 4As shown, the power distribution network including a photovoltaic energy storage and charging integrated power station is built, comprising a node 0, a node 1 and a node 2, G1 represents a generator, PSCIS represents the photovoltaic energy storage and charging integrated power station, Z1 and Z2 represent line impedance, U N represents a rated voltage, is a voltage of each node, the node 2 is on the side of the loop closing point, the power regulation demand of the photovoltaic energy storage and charging integrated power station is analyzed; taking the node 0 as a balance node, ignoring the line-to-ground admittance and network loss, the following equation set can be established by the forward-backward substitution method:

[0067] wherein, is the transmission power of the line between the node 0 and the node 1, is the transmission power of the line between the node 1 and the node 2, is the load power of the node 1, is the load power of the node 2, is the output power of the photovoltaic energy storage and charging integrated power station at the loop closing point, is a voltage of each node. Solving the equation set can obtain the active power P PSCIS (U m2 , δ m2 ) and the reactive power Q PSCIS (U m2 , δ m2 ) input by the photovoltaic energy storage and charging integrated power station to the power distribution network:

[0068] wherein the actual regulation power of the photovoltaic energy storage and charging integrated power station should be within the pre-calculated total adjustable power range , and the specific expression is as follows:

[0069] Specifically, in order to meet the functional requirement of temporary island operation, in the short-term island operation mode, the PQ control method is switched to the grid-forming control method of the virtual synchronous generator, so as to improve the stability and dynamic response capability of the inverter power supply in the power system.

[0070] The conventional generator realizes the control of the output active power by adjusting the mechanical torque, while the control based on the virtual synchronous generator can introduce the frequency deviation feedback instruction ΔP f while adjusting the virtual mechanical power P m , so as to realize the regulation of the active power instruction P ref of the grid-connected inverter. After introducing the active-frequency droop characteristic control of the synchronous generator, in the steady state, it is assumed that the frequency deviation feedback instruction satisfies ΔP f =-k f (f-f0), corresponding to the virtual mechanical power P mThe arrangement can be represented as: P m = P ref -k f (f-f0), wherein k f is an active regulation coefficient, f is the terminal voltage frequency of the virtual synchronous generator, and f0 is the rated frequency of the power distribution network.

[0071] The conventional generator controls the output reactive power and the terminal voltage by adjusting the excitation, while the control based on the virtual synchronous generator controls the above parameters by adjusting the virtual potential E. The virtual potential instruction value E includes three parts: the no-load potential E0 of the virtual synchronous generator, the adjustment of the reactive power ΔE Q , and the output ΔE U corresponding to the excitation adjustment or voltage adjustment of the synchronous generator. After introducing the reactive-voltage droop characteristic control of the synchronous generator, i.e., E = E0 + ΔE U + ΔE Q , the introduction of the reactive-voltage droop control makes ΔE Q = K Q (Q ref -Q), K Q is a reactive regulation coefficient based on the reactive power difference, Q ref is the output reactive power reference instruction of the inverter, and Q is the actual value of the output reactive power of the inverter; ΔE U = K U (U ref -U), K U is a reactive regulation coefficient based on the voltage difference, U ref is the output voltage reference instruction of the inverter, and U is the actual output voltage.

[0072] Specifically, the finally generated target topology structure and the light-storage-charging integrated power station regulation scheme of each time period are uploaded to the regulation center, and after being checked to be correct, the corresponding recovery instruction is issued to ensure the feasibility in the entire fault recovery interval and improve the continuous power supply capacity of the key load.

[0073] Specifically, in view of the deficiencies of the prior art and the fault recovery demand of the power distribution network under extreme weather, the application takes into account the space-time evolution characteristics of the power distribution network fault under extreme weather disasters and the over-limit problem of the reclosing inrush current, and takes into account the interactive influence of the fault repair resources and the recovery method, by constructing a light-storage-charging integrated power station model, a method for supporting the post-disaster load power supply and assisting the reclosing of the power distribution network by using the adjustable potential of the light-storage-charging integrated power station (i.e., the fault recovery method of the power distribution network) is proposed.

[0074] Specifically, the power distribution network fault recovery method of the present application considers the transient security problem in the switch switching process while ensuring the minimization of operation cost and the maximization of important load power supply recovery rate, and incorporates the utilization of grid adjustable resources into the fault recovery method, which is beneficial to improve the process safety and implementability of power distribution network fault recovery; by combining the disaster moving track obtained by short-term weather forecast information, the power distribution network fault recovery method of the present application considers the space-time evolution characteristics, overcomes the limitation of single event section generated recovery scheme, and has better adaptability to disasters caused by extreme weather.

[0075] In order for those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the power distribution network fault recovery method of the present application will be described in detail below in combination with specific embodiments.

[0076] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0077] The computer readable storage medium of the embodiment of the present application stores a program, wherein the program controls the device where the computer readable storage medium is located to execute the power distribution network fault recovery method when the program is running.

[0078] Specifically, the power distribution network fault recovery method comprises:

[0079] In step S201, the power distribution network data at the fault time is obtained, the power distribution network data comprising power distribution network structure parameters, distributed power state parameters, load state parameters, switch action unit cost and user power failure cost, the power distribution network structure parameters comprising branch connection conditions and corresponding geographic latitude and longitude information of the power distribution network, the distributed power state parameters comprising output size of distributed power in the power distribution network, the load state parameters representing power of node load in the power distribution network and priority conditions of the node load, the switch action unit cost representing cost generated by each time of executing switch operation in the power distribution network, and the user power failure cost representing economic loss brought to users due to power supply interruption, and the fault time representing the time when the power distribution network fails;

[0080] In step S202, meteorological data of the place where the power distribution network is located during the fault recovery period is obtained, the fault recovery period representing the period during which the power distribution network is recovered after the fault occurs;

[0081] Step S203, constructing a light-storage-charging integrated power station model according to the meteorological data, and determining a total adjustable power interval of the light-storage-charging integrated power station model, the light-storage-charging integrated power station model comprising a photovoltaic power generation system model, a storage system model and a charging station model, and the total adjustable power interval representing a total power interval that can be adjusted by the light-storage-charging integrated power station within an operating range;

[0082] Step S204, drawing a moving track of a meteorological disaster according to the meteorological data, and determining a moving speed of the meteorological disaster according to the moving track and the meteorological data, and dividing the fault recovery period into a plurality of different time periods according to the moving speed;

[0083] Step S205, reconstructing a network topology of the power distribution network in the time period according to the power distribution network data, to obtain a target topology structure;

[0084] Step S206, calculating a closing loop impact current according to the target topology structure, and performing a safety check on the closing loop impact current, the closing loop impact current representing a transient current generated by the target topology structure when a closing loop operation is performed;

[0085] Step S207, in a case where the closing loop impact current fails to pass the safety check, adjusting a power of the light-storage-charging integrated power station according to the total adjustable power interval, so that the closing loop impact current passes the safety check.

[0086] Optionally, reconstructing a network topology of the power distribution network in the time period according to the power distribution network data, to obtain a target topology structure, comprises: determining a target function as and determining an equality constraint condition as wherein ε is a line set in the power distribution network, c' ij and c ij are binary variables, c' ij represents an on-off state of a line ij before reconstruction, c ij represents an on-off state of the line ij after reconstruction, N is a node load set in the power distribution network, ω i is a load weight of an i-th node load, b i is a binary variable, representing a live state of the i-th node load, P loadi is an active power of the i-th node load, Δt represents a fault duration, β1 represents a first weight, β2 represents a second weight, P ij represents an active power of the line ij, Q ij represents a reactive power of the line ij, U ij represents a voltage of the line ij, and I ijrepresenting a current of the line ij; and solving the objective function according to a network structure constraint condition, a power distribution network operation constraint condition, and the above-mentioned equation constraint condition, so as to minimize F1, and obtaining the target topology structure, wherein the network structure constraint condition represents a constraint condition of a network topology structure of the power distribution network, and the power distribution network operation constraint condition represents a constraint condition of the power distribution network in the operation process.

[0087] Optionally, according to the target topology structure, the loop-inrush current is calculated, including: simplifying an impedance of a passive loop network into a series circuit according to the target topology structure, wherein the resistance R and the inductance L are connected in series in the series circuit, and the passive loop network represents a network topology part of the target topology structure which does not contain a power supply; and determining the loop-inrush current as

[0088] wherein, τ1=L / R, i(t) represents the loop-inrush current at t, I m is a steady-state current amplitude of the target topology structure after the loop-in, U2 is a voltage amplitude of a first end of the loop-in point, U3 is a voltage amplitude of a second end of the loop-in point, δ2 is a voltage phase angle of the first end of the loop-in point, δ3 is a voltage phase angle of the second end of the loop-in point, τ1 is an attenuation constant, t0 is a time when the target topology structure performs the loop-in operation, and ω is an angular frequency.

[0089] Optionally, the loop-inrush current is safety checked, including: determining whether the loop-inrush current satisfies a first condition, the first condition being i(t) max ≤I l，max , wherein i(t) max is a maximum value of the loop-inrush current, I l，max is a preset maximum allowable current of the line, the maximum allowable current of the line representing a maximum current value allowed to pass through the line in the target topology structure; in a case where the loop-inrush current does not satisfy the first condition, it is determined that the loop-inrush current fails the safety check; and in a case where the loop-inrush current satisfies the first condition, it is determined that the loop-inrush current passes the safety check.

[0090] Optionally, according to the total adjustable power interval, the power of the integrated optical storage and charging power station is adjusted so that the loop-inrush current passes the safety check, including: according to the total adjustable power interval, the power of the integrated optical storage and charging power station is adjusted so that U2 and U3 satisfy a second condition, the second condition being wherein,

[0091] Optionally, according to the meteorological data, a light-storage-charging integrated power station model is constructed, and a total adjustable power interval of the light-storage-charging integrated power station model is determined, including: according to the meteorological data, a photovoltaic power generation system model is established, and an adjustable power interval of the photovoltaic power generation system is determined; according to the meteorological data, an energy storage system model is established, and an adjustable power interval of the energy storage system is determined; according to the meteorological data, a charging station model is established, and an adjustable power interval of the charging station is determined; according to the adjustable power interval of the photovoltaic power generation system, the adjustable power interval of the energy storage system, and the adjustable power interval of the charging station, the total adjustable power interval is determined as wherein, is the total adjustable power interval at t, is the adjustable power interval of the photovoltaic power generation system at t, is the adjustable power interval of the energy storage system at t, is the adjustable power interval of the charging station at t.

[0092] Optionally, according to the total adjustable power interval, the power of the light-storage-charging integrated power station is adjusted, including: it is determined whether a target adjustment power is located in the adjustable power interval of the energy storage system, the target adjustment power representing the power required to be adjusted to make the closed-loop inrush current pass the safety check; in the case that the target adjustment power is located in the adjustable power interval of the energy storage system, the power of the energy storage system is adjusted.

[0093] The application further provides a computer program product comprising computer instructions which, when executed by a processor, implement the following method steps: step S201, obtaining power distribution network data at a fault time, wherein the power distribution network data comprises power distribution network structure parameters, distributed power supply state parameters, load state parameters, switch operation unit cost and user power failure cost, the power distribution network structure parameters comprise branch connection conditions of the power distribution network and corresponding geographic latitude and longitude information, the distributed power supply state parameters comprise output size of a distributed power supply in the power distribution network, the load state parameters represent power of a node load in the power distribution network and priority conditions of the node load, the switch operation unit cost represents cost generated by each time of performing a switch operation in the power distribution network, the user power failure cost represents economic loss brought to a user due to power supply interruption, and the fault time represents a time when the power distribution network fails; step S202, obtaining meteorological data of a location of the power distribution network during a fault recovery period, wherein the fault recovery period represents a period during which the power distribution network is recovered after the power distribution network fails; step S203, constructing a light-storage-charging integrated power station model according to the meteorological data, and determining a total adjustable power interval of the light-storage-charging integrated power station model, wherein the light-storage-charging integrated power station model comprises a photovoltaic power generation system model, an energy storage system model and a charging station model, and the total adjustable power interval represents a total power interval that can be adjusted by the light-storage-charging integrated power station within an operating range; step S204, drawing a moving track of a meteorological disaster according to the meteorological data, determining a moving speed of the meteorological disaster according to the moving track and the meteorological data, and dividing the fault recovery period according to the moving speed to obtain a plurality of different time periods; step S205, reconstructing a network topology structure of the power distribution network in the time periods according to the power distribution network data to obtain a target topology structure; step S206, calculating a loop-inrush current according to the target topology structure, and performing safety checking on the loop-inrush current, wherein the loop-inrush current represents a transient current generated by the target topology structure when a loop-in operation is performed; and step S207, adjusting power of the light-storage-charging integrated power station according to the total adjustable power interval when the loop-inrush current does not pass the safety checking, so that the loop-inrush current passes the safety checking.

[0094] Optionally, reconstructing a network topology structure of the power distribution network in the time periods according to the power distribution network data to obtain a target topology structure comprises: determining a target function as and determining an equation constraint condition as wherein ε is a line set in the power distribution network, c′ ij and c ij are binary variables, and c′ ijdenotes the open-closed state of line ij before reconstruction, c ij denotes the open-closed state of line ij after reconstruction, N is a set of node loads in the power distribution network, ω i is a load weight of the ith node load, b i is a binary variable, indicating the energized state of the ith node load, P loadi is the active power of the ith node load, Δt represents the duration of the fault, β1 represents the first weight, β2 represents the second weight, P ij denotes the active power of line ij, Q ij denotes the reactive power of line ij, U ij denotes the voltage of line ij, I ij denotes the current of line ij; according to the network structure constraint condition, the power distribution network operation constraint condition and the above equation constraint condition, the above objective function is solved to minimize F1, and the target topology structure is obtained, wherein the network structure constraint condition represents the constraint condition of the network topology structure of the power distribution network, and the power distribution network operation constraint condition represents the constraint condition of the power distribution network in the operation process.

[0095] Optionally, according to the target topology structure, the loop-inrush current is calculated, including: simplifying the impedance of a passive loop network into a series circuit according to the target topology structure, wherein the resistance R and the inductance L are connected in series in the series circuit, and the passive loop network represents a network topology part of the target topology structure which does not contain a power supply; determining the loop-inrush current as

[0096]

[0097] wherein, τ1=L / R, i(t) represents the loop-inrush current at time t, I m is the steady-state current amplitude of the target topology structure after loop-in, U2 is the voltage amplitude of the first end of the loop point, U3 is the voltage amplitude of the second end of the loop point, δ2 is the voltage phase angle of the first end of the loop point, δ3 is the voltage phase angle of the second end of the loop point, τ1 is the attenuation constant, t0 is the time when the target topology structure performs the loop-in operation, and ω is the angular frequency.

[0098] Optionally, the loop-inrush current is safety checked, including: determining whether the loop-inrush current satisfies a first condition, the first condition being i(t) max ≤I l，max , wherein i(t) max is the maximum value of the loop-inrush current, I l，maxThe preset line maximum allowable current is a maximum current value allowed to pass through a line in the target topology; in a case where the closing loop impulse current does not satisfy the first condition, it is determined that the closing loop impulse current fails the safety check; in a case where the closing loop impulse current satisfies the first condition, it is determined that the closing loop impulse current passes the safety check.

[0099] Optionally, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the closing loop impulse current passes the safety check, including: the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that U2 and U3 satisfy a second condition, the second condition being wherein,

[0100] Optionally, the light-storage-charging integrated power station model is constructed according to the meteorological data, and the total adjustable power interval of the light-storage-charging integrated power station model is determined, including: the photovoltaic power generation system model is established according to the meteorological data, and the adjustable power interval of the photovoltaic power generation system is determined; the energy storage system model is established according to the meteorological data, and the adjustable power interval of the energy storage system is determined; the charging station model is established according to the meteorological data, and the adjustable power interval of the charging station is determined; the total adjustable power interval is determined according to the adjustable power interval of the photovoltaic power generation system, the adjustable power interval of the energy storage system, and the adjustable power interval of the charging station wherein, The total adjustable power interval at t is The adjustable power interval of the photovoltaic power generation system at t is The adjustable power interval of the energy storage system at t is The adjustable power interval of the charging station at t is.

[0101] Optionally, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, including: it is determined whether a target adjustment power is located in the adjustable power interval of the energy storage system, the target adjustment power representing a power required to be adjusted so that the closing loop impulse current passes the safety check; in a case where the target adjustment power is located in the adjustable power interval of the energy storage system, the power of the energy storage system is adjusted.

[0102] The embodiment of the present application further provides an electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise program code for executing any one of the power distribution network fault recovery methods.

[0103] Obviously, those skilled in the art should understand that each module or each step of the present application described above can be realized by a general computing device, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by the computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in different sequences, or they can be respectively manufactured into each integrated circuit module, or multiple modules or steps among them can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0104] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0105] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device implemented in the flowcharts and / or block diagrams. Figure 1 The device that implements the function specified in one flow or multiple flows and / or blocks. Figure 1 The device that implements the function specified in one flow or multiple flows and / or blocks.

[0106] These computer program instructions can also be stored in a computer readable storage medium capable of guiding the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a product including instruction devices, which implement the flowcharts and / or block diagrams. Figure 1 The device that implements the function specified in one flow or multiple flows and / or blocks. Figure 1the function(s) specified in the block or blocks.

[0107] These computer program instructions can also be loaded into computer or other programmable data processing devices to cause a series of operational steps to be performed on the computer or other programmable devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable devices provide steps for implementing the flowchart Figure 1 the flowchart or flowchart and / or block Figure 1 the function(s) specified in the block or blocks.

[0108] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0109] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the computer stores information about an operating system or application programs and / or non-volatile memory, such as read only memory (ROM), flash memory, or the like, about which the computer stores information, such as firmware for the processing device. Thus, the memory is an example of computer readable media.

[0110] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0111] It should also be noted that the terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0112] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0113] In the power distribution network fault recovery method of the present application, first, the power distribution network data at the fault time is obtained, and the meteorological data of the place where the power distribution network is located during the fault recovery is obtained, then according to the meteorological data, the light-storage-charging integrated power station model is constructed, and the total adjustable power interval of the light-storage-charging integrated power station model is determined, then according to the meteorological data, the moving track of the meteorological disaster is drawn, and the moving speed of the meteorological disaster is determined, according to the moving speed, the fault recovery period is divided to obtain multiple different time periods, and according to the power distribution network data, the network topology structure of the power distribution network in the time period is reconstructed to obtain the target topology structure, then according to the target topology structure, the loop-inrush current is calculated, and the loop-inrush current is safety checked, when the loop-inrush current fails to pass the safety check, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop-inrush current passes the safety check. Compared with the prior art which does not consider the transient change of electrical quantity in the power distribution network fault recovery process and its influence, resulting in low safety, the present application calculates the loop-inrush current according to the target topology structure, and safety checks the loop-inrush current, when the loop-inrush current fails to pass the safety check, the power of the light-storage-charging integrated power station is adjusted according to the total adjustable power interval, so that the loop-inrush current passes the safety check, that is, the transient safety problem in the switching process is considered, the utilization of the grid adjustable resource (i.e. the light-storage-charging integrated power station) is included in the fault recovery method, which is conducive to ensuring that the safety of the power distribution network fault recovery process is high; in addition, by combining the moving track of the meteorological disaster obtained from the meteorological data, the spatio-temporal evolution characteristics of the power distribution network fault under extreme meteorological disasters are considered, which ensures good adaptability to meteorological disasters caused by extreme weather.

[0114] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of fault restoration for a power distribution network, characterized by, The method comprises the following steps: obtaining power distribution network data at a fault time, wherein the power distribution network data comprises power distribution network structure parameters, distributed power state parameters, load state parameters, switch action unit cost and user outage cost, the power distribution network structure parameters comprise branch connection conditions and corresponding geographic latitude and longitude information of the power distribution network, the distributed power state parameters comprise output size of distributed power in the power distribution network, the load state parameters represent power of node load in the power distribution network and priority conditions of the node load, the switch action unit cost represents cost generated by each switch operation in the power distribution network, and the user outage cost represents economic loss brought to users due to power supply interruption, and the fault time represents a time when the power distribution network fails; obtaining meteorological data of a place where the power distribution network is located during a fault recovery period, wherein the fault recovery period represents a period during which the power distribution network is recovered after the power distribution network fails; constructing a light-storage-charging integrated power station model according to the meteorological data, and determining a total adjustable power interval of the light-storage-charging integrated power station model, wherein the light-storage-charging integrated power station model comprises a photovoltaic power generation system model, an energy storage system model and a charging station model, and the total adjustable power interval represents a total power interval that can be adjusted within an operating range of the light-storage-charging integrated power station; drawing a moving track of a meteorological disaster according to the meteorological data, determining a moving speed of the meteorological disaster according to the moving track and the meteorological data, and dividing the fault recovery period into a plurality of different time periods according to the moving speed; reconfiguring a network topology structure of the power distribution network in the time periods according to the power distribution network data to obtain a target topology structure; calculating a loop closing impact current according to the target topology structure, and performing safety checking on the loop closing impact current, wherein the loop closing impact current represents a transient current generated when the target topology structure is subjected to loop closing operation; in a case where the loop closing impact current fails to pass the safety checking, adjusting power of the light-storage-charging integrated power station according to the total adjustable power interval, so that the loop closing impact current passes the safety checking.

2. The power distribution network fault restoration method of claim 1, wherein, reconfiguring a network topology structure of the power distribution network in the time periods according to the power distribution network data to obtain a target topology structure, comprising: According to the power distribution network data, a target function is determined as and an equation constraint condition is determined as wherein, is a line set in the power distribution network, and is a binary variable, represents an on-off state of a line before reconstruction, represents an on-off state of a line after reconstruction, N is a node load set in the power distribution network, is a load weight of an i-th node load, is a binary variable, representing a live state of the i-th node load, is an active power of the i-th node load, represents a fault duration, represents a first weight, represents a second weight, represents an active power of a line , represents a reactive power of a line , represents a voltage of a line , represents a current of a line . solving the target function according to network structure constraint conditions, power distribution network operation constraint conditions and the equality constraint conditions, so as to minimize F1 and obtain the target topology structure, wherein the network structure constraint conditions represent constraint conditions of the network topology structure of the power distribution network, and the power distribution network operation constraint conditions represent constraint conditions of the power distribution network in the operation process.

3. The power distribution network failure recovery method of claim 1, wherein, calculating a loop closing impact current according to the target topology structure, comprising: simplifying impedance of a passive ring network into a series circuit according to the target topology structure, wherein a resistor R and an inductor L are connected in series in the series circuit, and the passive ring network represents a network topology part of the target topology structure that does not contain a power source; determining the closing-impulse current as wherein, , , , denotes the closing-impulse current at time t, is the steady-state current amplitude of the target topology after closing, is the voltage amplitude at the first end of the closing point, is the voltage amplitude at the second end of the closing point, is the phase angle of the voltage at the first end of the closing point, is the phase angle of the voltage at the second end of the closing point, is a decay constant, and t0 is the time at which the target topology performs the closing operation, is an angular frequency.

4. The power distribution network failure recovery method according to claim 3, characterized by, performing safety checking on the loop closing impact current, comprising: determining whether the loop-inrush current satisfies a first condition, the first condition being wherein, is a maximum value of the loop-inrush current, is a preset line maximum allowable current, the line maximum allowable current representing a maximum current value allowed to pass through a line in the target topology. In a case where the loop-inrush current does not satisfy the first condition, it is determined that the loop-inrush current fails the safety check; In a case where the loop-inrush current satisfies the first condition, it is determined that the loop-inrush current passes the safety check.

5. The method of claim 4, wherein, According to the total adjustable power interval, adjusting the power of the integrated light-storage-charging power station so that the loop-inrush current passes the safety check, comprising: According to the total adjustable power interval, the power of the optical storage and charging integrated power station is adjusted so as to and satisfy a second condition, the second condition being wherein .

6. The power distribution network failure recovery method of claim 1, wherein, According to the meteorological data, constructing an integrated light-storage-charging power station model and determining a total adjustable power interval of the integrated light-storage-charging power station model, comprising: According to the meteorological data, establishing the photovoltaic power generation system model and determining an adjustable power interval of the photovoltaic power generation system; According to the meteorological data, establishing the energy storage system model and determining an adjustable power interval of the energy storage system; According to the meteorological data, establishing the charging station model and determining an adjustable power interval of the charging station; determining the total adjustable power interval as wherein, the total adjustable power interval at time t, the adjustable power interval of the photovoltaic power generation system at time t, the adjustable power interval of the energy storage system at time t, the adjustable power interval of the charging station at time t.

7. The method of claim 6, wherein, According to the total adjustable power interval, adjusting the power of the integrated light-storage-charging power station, comprising: Determining whether a target adjustment power is located in the adjustable power interval of the energy storage system, the target adjustment power representing the power needed to be adjusted so that the loop-inrush current passes the safety check; In a case where the target adjustment power is located in the adjustable power interval of the energy storage system, adjusting the power of the energy storage system.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the computer readable storage medium controls the device where the computer readable storage medium is located to execute the power distribution network fault recovery method of any one of claims 1 to 7 when the program is running.

9. A computer program product comprising computer instructions, characterized in that, The computer instructions are executed by the processor to implement the power distribution network fault recovery method of any one of claims 1 to 7.

10. An electronic device, comprising: Comprising: One or more processors, memories, and one or more programs, wherein the one or more programs are stored in the memories and configured to be executed by the one or more processors, and the one or more programs comprise a program for executing the power distribution network fault recovery method of any one of claims 1 to 7.

Images