Fault recovery method of power distribution network, computer program product and electronic equipment

Abstract

The invention provides a fault recovery method of a power distribution network, a computer program product and electronic equipment. The method comprises the following steps: acquiring power distribution network data at a fault moment; acquiring meteorological data of the location of the power distribution network during fault recovery; according to the meteorological data, constructing a light storage and charging integrated power station model, and determining a total adjustable power interval of the light storage and charging integrated power station model; according to the meteorological data, a movement track of the meteorological disaster is drawn, the movement speed of the meteorological disaster is determined, a fault recovery period is divided according to the movement speed, and a plurality of time periods are obtained; according to the power distribution network data, reconstructing a network topology structure of the power distribution network in the time period to obtain a target topology structure; according to the target topological structure, loop closing impact current is calculated, and safety checking is carried out on the loop closing impact current; and when the closed-loop impact current does not pass the safety check, adjusting the power of the optical storage and charging integrated power station according to the total adjustable power interval. The problem that in the prior art, safety is low in the power distribution network fault recovery process is solved.

Description

Technical Field

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

[0002] When a distribution network failure occurs due to extreme weather disasters, fast and effective fault recovery is an important means to improve the resilience of the distribution network. Existing research on distribution network fault recovery and resilience improvement mainly focuses on factors such as investment cost, network loss, number of switch operations, voltage fluctuations, and power supply reliability indicators, and provides guidance for post-disaster distribution network reconstruction by building a multi-objective optimization model. Fault recovery of distribution networks with a high proportion of DG faces problems such as DG output differences, randomness, and time-varying loads, making traditional static distribution network reconstruction schemes no longer applicable.

[0003] For faults caused by meteorological factors, existing research lacks consideration of the uncertainty of line faults under extreme disaster conditions, and the coordinated control methods of multiple types of resources in the distribution network are more inclined to optimize the configuration, while there is a lack of research on multi-source coordinated control methods after faults. The use of multiple energy sources for coordinated complementarity is conducive to smoothing the disadvantage of large DG fluctuations during fault recovery, and the recovery method is more reasonable and reliable. The integrated photovoltaic, energy storage and charging power station integrates multiple resources such as photovoltaics, energy storage, and electric vehicles. It has the advantages of intensiveness, in-station energy complementarity, and smoothing electric vehicle load fluctuations, which is conducive to improving the safety, reliability, stability, economy and environmental protection of the power grid.

[0004] In the prior art, little attention is paid to the transient safety of distribution network fault recovery schemes, and the transient changes of electrical quantities and their impacts during the implementation of fault recovery are not taken into account, resulting in low safety of distribution network fault recovery. Summary of the invention

[0005] The main purpose of the present application is to provide a distribution network fault recovery method, a computer-readable storage medium, a computer program product and an electronic device, so as to at least solve the problem that the prior art does not take into account the transient changes of electrical quantities and their impacts during the distribution network fault recovery process, resulting in low safety.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for fault recovery of a distribution network is provided, comprising: obtaining distribution network data at the time of fault, the distribution network data including distribution network structure parameters, distributed power supply state parameters, load state parameters, switch action unit cost and user power loss cost, the distribution network structure parameters including the branch connection status of the distribution network and the corresponding geographical longitude and latitude information, the distributed power supply state parameters including the output size of the distributed power supply in the distribution network, the load state parameters characterizing the power of the node load in the distribution network and the priority of the node load, the switch action unit cost represents the cost generated each time a switch operation is performed in the distribution network, the user power loss cost represents the economic loss caused to the user due to the power supply interruption, and the fault time represents the time when the distribution network fails; obtaining meteorological data of the location of the distribution network during the fault recovery period, the fault recovery period represents the period of recovery after the distribution network fails; constructing a photovoltaic storage and charging integrated power station model according to the meteorological data, and confirming The total adjustable power range of the photovoltaic storage and charging integrated power station model is determined, and the photovoltaic storage and charging integrated power station model includes a photovoltaic power generation system model, an energy storage system model and a charging station model, and the total adjustable power range represents the total power range that can be adjusted within the operating range of the photovoltaic storage and charging integrated power station; according to the meteorological data, the movement trajectory of the meteorological disaster is drawn, and the movement speed of the meteorological disaster is determined according to the movement trajectory and the meteorological data, and the fault recovery period is divided according to the movement speed to obtain a plurality of different time periods; according to the distribution network data, the network topology structure of the distribution network within the time period is reconstructed to obtain a target topology structure; according to the target topology structure, the closed-loop impulse current is calculated, and the closed-loop impulse current is safety-checked, and the closed-loop impulse current represents the transient current generated by the target topology structure when the closed-loop operation is performed; when the closed-loop impulse current fails to pass the safety check, the power of the photovoltaic storage and charging integrated power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check.

[0007] Optionally, according to the distribution network data, reconstructing the network topology structure of the distribution network within the time period to obtain a target topology structure includes: determining, according to the distribution network data, a target function as follows: And determine the equality constraints as Where ε is the set of lines in the distribution network, c′ ij and c ij is a binary variable, c′ ij represents the open and closed state of line ij before reconstruction, c ij represents the opening and closing state of line ij after reconstruction, N is the node load set in the distribution network, ω iis the load weight of the i-th node load, b i is a binary variable, indicating the charged 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, β2 represents the second weight, P ij represents the active power of line ij, Q ij Represents the reactive power U of line ij ij represents the voltage of line ij, I ij Represents the current of line ij; according to the network structure constraints, the distribution network operation constraints and the equation constraints, the objective function is solved to minimize F1 and obtain the target topology structure, wherein the network structure constraints represent the constraints of the network topology structure of the distribution network, and the distribution network operation constraints represent the constraints of the distribution network during operation.

[0008] Optionally, according to the target topology, calculating the closed-loop impact current includes: according to the target topology, simplifying the impedance of the passive ring network into a series circuit, in which a resistor R and an inductor L are connected in series, and the passive ring network represents a network topology portion of the target topology that does not include a power supply; determining the closed-loop impact current as

[0009]

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

[0011] Optionally, performing a safety check on the closed-loop impulse current includes: determining whether the closed-loop impulse current satisfies a first condition, where the first condition is i(t) max ≤I l，max , where i(t) max is the maximum value of the closed-loop impulse current, I l，maxis a preset maximum allowable current of the line, and the maximum allowable current of the line represents the maximum current value allowed to pass through the line in the target topology structure; when the closed-loop impact current does not meet the first condition, it is determined that the closed-loop impact current has not passed the safety check; when the closed-loop impact current meets the first condition, it is determined that the closed-loop impact current has passed the safety check.

[0012] Optionally, according to the total adjustable power range, adjusting the power of the integrated photovoltaic storage and charging power station so that the closed-loop impact current passes the safety check, including: according to the total adjustable power range, adjusting the power of the integrated photovoltaic storage and charging power station so that U2 and U3 meet the second condition, the second condition is in,

[0013] Optionally, based on the meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and the total adjustable power range of the photovoltaic storage and charging integrated power station model is determined, including: based on the meteorological data, establishing the photovoltaic power generation system model, and determining the adjustable power range of the photovoltaic power generation system; based on the meteorological data, establishing the energy storage system model, and determining the adjustable power range of the energy storage system; based on the meteorological data, establishing the charging station model, and determining the adjustable power range of the charging station; based on the adjustable power range of the photovoltaic power generation system, the adjustable power range of the energy storage system, and the adjustable power range of the charging station, determining the total adjustable power range to be in, is the total adjustable power range at time t, is the adjustable power range of the photovoltaic power generation system at time t, is the adjustable power range of the energy storage system at time t, is the adjustable power range of the charging station at time t.

[0014] Optionally, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range, including: determining whether the target adjustment power is within the adjustable power range of the energy storage system, the target adjustment power representing the power that needs to be adjusted to make the closed-loop impact current pass the safety check; and adjusting the power of the energy storage system when the target adjustment power is within the adjustable power range of the energy storage system.

[0015] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the distribution network fault recovery methods.

[0016] According to another aspect of the present application, a computer program product is provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the distribution network fault recovery methods is implemented.

[0017] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing any one of the distribution network fault recovery methods described.

[0018] By applying the technical solution of the present application, firstly, the distribution network data at the time of the fault is obtained, and the meteorological data of the location of the distribution network during the fault recovery period is obtained; then, based on the meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and the total adjustable power range of the photovoltaic storage and charging integrated power station model is determined; then, based on the meteorological data, the movement trajectory of the meteorological disaster is drawn, and the movement speed of the meteorological disaster is determined; the fault recovery period is divided according to the movement speed to obtain a plurality of different time periods; and based on the distribution network data, the network topology structure of the distribution network within the time period is reconstructed to obtain the target topology structure; then, based on the target topology structure, the closed-loop impulse current is calculated, and the closed-loop impulse current is safety checked; when the closed-loop impulse current fails the safety check, the power of the photovoltaic storage and charging integrated power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check. Compared with the prior art which does not take into account the problem of low safety caused by transient changes in electrical quantities and their impact during the distribution network fault recovery process, the present application calculates the closed-loop impact current according to the target topology and performs a safety check on the closed-loop impact current. When the closed-loop impact current fails to pass the safety check, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range so that the closed-loop impact current passes the safety check. That is, the transient safety problem in the switch switching process is taken into account, and the utilization of the adjustable resources on the grid (that is, the integrated photovoltaic storage and charging power station) is incorporated into the fault recovery method, which is conducive to ensuring a high safety level in the distribution network fault recovery process. In addition, by combining the movement trajectory of meteorological disasters obtained from meteorological data and taking into account the spatiotemporal evolution characteristics of distribution network faults under extreme meteorological disasters, better adaptability to meteorological disasters caused by extreme weather is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1A hardware structure block diagram of a mobile terminal for executing a method for recovering a power distribution network fault provided in an embodiment of the present application is shown;

[0021] Figure 2 A schematic diagram of a flow chart of a method for fault recovery of a distribution network provided according to an embodiment of the present application is shown;

[0022] Figure 3 A schematic diagram of the internal structure of a photovoltaic storage and charging integrated power station provided according to an embodiment of the present application is shown;

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

[0024] The above drawings include the following reference numerals:

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

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. 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 solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

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

[0031] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for recovering a power distribution network fault according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0032] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the fault recovery method of the distribution network in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned 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 via a network. The above-mentioned specific examples of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as 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 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In this embodiment, a fault recovery method for a distribution network 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 FIG. 1 is a flow chart of a method for recovering a distribution network fault according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0035] Step S201, obtaining distribution network data at the time of a fault, wherein the distribution network data includes distribution network structure parameters, distributed power supply state parameters, load state parameters, switch action unit cost, and user power outage cost. The distribution network structure parameters include branch connection conditions of the distribution network and corresponding geographic longitude and latitude information. The distributed power supply state parameters include the output of distributed power supplies in the distribution network. The load state parameters represent the power of node loads in the distribution network and the priority of the node loads. The switch action unit cost represents the cost generated by each switch operation in the distribution network. The user power outage cost represents the economic loss caused to the user due to power supply interruption. The fault time represents the time when the distribution network fails.

[0036] Step S202, obtaining meteorological data of the location of the distribution network during a fault recovery period, wherein the fault recovery period represents a period of recovery after a fault occurs in the distribution network;

[0037] Step S203, constructing a photovoltaic, energy storage and charging integrated power station model according to the above-mentioned meteorological data, and determining the total adjustable power range of the photovoltaic, energy storage and charging integrated power station model, wherein the photovoltaic, energy storage and charging integrated power station model includes a photovoltaic power generation system model, an energy storage system model and a charging station model, and the total adjustable power range represents the total power range that can be adjusted within the operating range of the photovoltaic, energy storage and charging integrated power station;

[0038] Step S204, drawing a moving track of the 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 according to the moving speed to obtain a plurality of different time periods;

[0039] Step S205, reconstructing the network topology structure of the distribution network within the time period according to the distribution network data to obtain a target topology structure;

[0040] Step S206, calculating the closed-loop impact current according to the target topology, and performing a safety check on the closed-loop impact current, wherein the closed-loop impact current represents a transient current generated by the target topology when performing a closed-loop operation;

[0041] Step S207, when the closed-loop impulse current fails to pass the safety check, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check.

[0042] Through the above embodiment, firstly, the distribution network data at the time of the fault is obtained, and the meteorological data of the location of the distribution network during the fault recovery period is obtained. Then, according to the meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and the total adjustable power range of the photovoltaic storage and charging integrated power station model is determined. Then, according to the meteorological data, the movement trajectory of the meteorological disaster is drawn, and the movement speed of the meteorological disaster is determined. The fault recovery period is divided according to the movement speed to obtain multiple different time periods. According to the distribution network data, the network topology structure of the distribution network within the time period is reconstructed to obtain the target topology structure. Then, according to the target topology structure, the closed-loop impulse current is calculated, and the closed-loop impulse current is safety checked. When the closed-loop impulse current fails to pass the safety check, the power of the photovoltaic storage and charging integrated power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check. Compared with the prior art which does not take into account the problem of low safety caused by transient changes in electrical quantities and their impact during the distribution network fault recovery process, the present application calculates the closed-loop impact current according to the target topology and performs a safety check on the closed-loop impact current. When the closed-loop impact current fails to pass the safety check, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range so that the closed-loop impact current passes the safety check. That is, the transient safety problem in the switch switching process is taken into account, and the utilization of the adjustable resources on the grid (that is, the integrated photovoltaic storage and charging power station) is incorporated into the fault recovery method, which is conducive to ensuring a high safety level in the distribution network fault recovery process. In addition, by combining the movement trajectory of meteorological disasters obtained from meteorological data and taking into account the spatiotemporal evolution characteristics of distribution network faults under extreme meteorological disasters, better adaptability to meteorological disasters caused by extreme weather is ensured.

[0043] Specifically, for faults caused by meteorological factors, meteorological data of the area can be obtained, including wind speed, rainfall, radiation intensity, etc. The temporal and spatial resolution of the meteorological data is 0.03°×0.03° / h.

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

[0045] In an optional solution, based on the distribution network data, the network topology structure of the distribution network in the time period is reconstructed to obtain the target topology structure, including: based on the distribution network data, determining the target function as And determine the equality constraints as Where ε is the set of lines in the above distribution network, c′ ij and c ij is a binary variable, c ij represents the open and closed state of line ij before reconstruction, c ijrepresents the opening and closing state of line ij after reconstruction, N is the node load set in the above distribution network, ω i is the load weight of the i-th node load, b i is a binary variable, indicating the charged state of the i-th node load, P loadi is the active power of the i-th node load, Δt represents the fault duration, β1 represents the first weight, β2 represents the second weight, P ij represents the active power of line ij, Q ij Represents the reactive power U of line ij ij represents the voltage of line ij, I ij Represents the current of line ij; according to the network structure constraints, the distribution network operation constraints and the above-mentioned equation constraints, the above-mentioned objective function is solved to minimize F1 and obtain the above-mentioned target topology structure, wherein the above-mentioned network structure constraints characterize the constraints of the network topology structure of the above-mentioned distribution network, and the above-mentioned distribution network operation constraints characterize the constraints of the above-mentioned distribution network during operation. In this embodiment, an objective function is established, and according to the network structure constraints, the distribution network operation constraints and the equation constraints, the objective function is solved to minimize F1 (that is, to minimize the operating cost and maximize the power supply recovery rate of important loads), ensuring that the obtained target topology structure is good.

[0046] In actual application, those skilled in the art may set the first weight and the second weight based on empirical values, or obtain them through multiple experiments, and this application does not impose any specific restrictions on this.

[0047] Specifically, within the spatiotemporal accuracy of available meteorological data, the movement trajectory of meteorological disasters is drawn, and time periods are divided according to the movement speed. The distribution network is continuously reconstructed and optimized during the fault recovery period, and a reconstruction plan is output. In order to improve the resilience of the power grid, the present invention selects the weighted load equivalent recovery rate (i.e. ), total number of switch actions (i.e. ) is used as the indicator of the recovery scheme, and the objective function is constructed by assigning corresponding cost weights (i.e., β1, β2).

[0048] Specifically, in order to maintain the safe and reliable operation of the power grid during the entire fault process, radial network constraints and fault branch set constraints are selected as network structure constraints, and branch current safety constraints, node voltage safety constraints, power supply power constraints and branch power transmission constraints are selected as distribution network operation constraints. Among them, radial network constraints: ensure that the distribution network maintains a radial structure, that is, radiates outward from a power source, and each node is only connected to one upper node to simplify network management and fault location; fault branch set constraints: in the set of faulty branches, it is necessary to consider how to isolate the fault area by reconstructing the network while ensuring the power supply of the non-fault area; branch current safety constraints: ensure that the current of all branches in the distribution network does not exceed its maximum allowable value to prevent overload and equipment damage; node voltage safety constraints: ensure that the voltage of all nodes in the distribution network is maintained within a safe range, neither lower than the minimum voltage requirement nor higher than the maximum voltage limit; power supply power constraints: ensure that the output power of the power supply does not exceed its maximum available power, and at the same time not lower than the minimum output requirement; branch power transmission constraints: ensure 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, the closed-loop impact current is calculated, including: according to the target topology, simplifying the impedance of the passive ring network into a series circuit, in which the resistor R and the inductor L are connected in series, and the passive ring network represents the network topology part that does not include the power supply in the target topology; determining the closed-loop impact current as

[0050] in, τ1=L / R, i(t) represents the above-mentioned closed-loop impulse current at time t, I m is the steady-state current amplitude of the target topology after closing the loop, U2 is the voltage amplitude at the first end of the closing point, U3 is the voltage amplitude at the second end of the closing point, δ2 is the voltage phase angle at the first end of the closing point, δ3 is the voltage phase angle at the second end of the closing point, τ1 is the attenuation constant, t0 is the moment when the target topology performs the closing operation, and ω is the angular frequency. In this embodiment, a specific formula is used to calculate the closing impulse current, which ensures that the obtained closing impulse current is relatively accurate, and ensures that the safety assessment of the closing operation is relatively accurate, thereby further ensuring that the safety of the distribution network fault recovery process is high.

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

[0052] In some other optional solutions, the safety check of the closed-loop impulse current includes: determining whether the closed-loop impulse current satisfies a first condition, wherein the first condition is i(t) max ≤I l，max , where i(t) max is the maximum value of the above-mentioned closed-loop impulse current, I l，max is the preset maximum allowable current of the line, and the above-mentioned maximum allowable current of the line represents the maximum current value allowed to pass through the line in the above-mentioned target topology structure; when the above-mentioned closed-loop impact current does not meet the above-mentioned first condition, it is determined that the above-mentioned closed-loop impact current has not passed the above-mentioned safety check; when the above-mentioned closed-loop impact current meets the above-mentioned first condition, it is determined that the above-mentioned closed-loop impact current has passed the above-mentioned safety check. In this embodiment, by comparing the maximum value of the closed-loop impact current with the preset maximum allowable current of the line, it can be ensured that during the closed-loop operation, the current passing through the line will not exceed its tolerance limit, thereby avoiding line damage or safety accidents caused by excessive current. When it is determined that the closed-loop impact current has not passed the safety check, the power of the integrated photovoltaic storage and charging power station can be adjusted according to the total adjustable power range to meet the safety standards. This 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 of the closed-loop impulse current i(t) max That is, the maximum instantaneous current of the line.

[0054] In some other optional schemes, according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted so that the above-mentioned closed-loop impact current passes the above-mentioned safety check, including: according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted so that U2 and U3 meet the second condition, and the above-mentioned second condition is in, In this embodiment, the power of the integrated photovoltaic storage and charging power station is adjusted to ensure that the voltage at both ends of the loop point meets the second condition, thereby further improving the safety of the distribution network during fault recovery.

[0055] Specifically, when the safety check fails, the initial phase angle of the closed loop is adjusted to suppress the closed loop impact current, that is, to meet the requirements as much as possible. It can be obtained that the voltage at both ends of the closing point should meet the second condition. In order to adjust the initial phase angle of the closing loop to suppress the closing loop impact current, the network flow is changed by adjusting the power of the integrated photovoltaic storage and charging power station, so that the voltage at both ends of the closing point meets the requirements.

[0056] In some exemplary embodiments, a photovoltaic storage and charging integrated power station model is constructed based on the above-mentioned meteorological data, and the total adjustable power range of the photovoltaic storage and charging integrated power station model is determined, including: establishing the above-mentioned photovoltaic power generation system model based on the above-mentioned meteorological data, and determining the adjustable power range of the photovoltaic power generation system; establishing the above-mentioned energy storage system model based on the above-mentioned meteorological data, and determining the adjustable power range of the energy storage system; establishing the above-mentioned charging station model based on the above-mentioned meteorological data, and determining the adjustable power range of the charging station; according to the above-mentioned adjustable power range of the above-mentioned photovoltaic power generation system, the above-mentioned adjustable power range of the above-mentioned energy storage system and the above-mentioned adjustable power range of the above-mentioned charging station, determining that the above-mentioned total adjustable power range is in, is the total adjustable power range at time t, is the adjustable power range of the photovoltaic power generation system at time t, is the adjustable power range of the energy storage system at time t, is the above adjustable power range of the above charging station at time t. In this embodiment, by separately modeling and determining the adjustable power ranges of the photovoltaic power generation system, the energy storage system and the charging station, these resources can be managed and deployed more effectively to ensure that every energy can be reasonably used during the fault recovery period.

[0057] Specifically, for the construction of the photovoltaic power generation system model, it is necessary to estimate the photovoltaic output in order to optimize the output curve. According to the power generation principle of the photovoltaic effect of solar cells, as well as the empirical formula of photoelectric conversion and reasonable empirical coefficients, when the solar radiation value is determined, the photovoltaic power generation output power can be calculated as: Among them, P PV (t) is the time-varying output of the photovoltaic power generation system, ρ is the temperature influence coefficient, which is generally -0.35% / ℃~0.5% / ℃, I s (t) is the time-varying solar radiation at the photovoltaic panel, A PV is the photovoltaic panel area, 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 irradiation intensity obtained under standard conditions, I PV，s It is the rated output of the photovoltaic system.

[0058] Specifically, for the construction of the energy storage system model, it is necessary to take into account the real-time maximum charging and discharging power constraints of the energy storage system, the upper and lower limits of the energy storage capacity, and the charging and discharging cycle process. The charging and discharging model of the energy storage system in the photovoltaic storage and charging integrated power station is:

[0059]

[0060] Among them, Pch，t is the charging active power at time t, P dis，t is the discharge active power at time t, Q ch，t is the charging reactive power at time t, Q dis，t is the discharge reactive power at time t, M ESS is a binary variable for energy storage charge and discharge flag (0 for discharge, 1 for charge), E t is the remaining power of the energy storage system at the end of time t, E Full is the full charge of the energy storage system, S max is the capacity of the energy storage system, T is the duration of each time period, SOC t is the charge state of the energy storage device at time t.

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

[0062] Specifically, is the output range of the photovoltaic power generation system, is the output power range of the energy storage system, It is the adjustable power range of EV (electric vehicle).

[0063] In some other exemplary embodiments, according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted, including: determining whether the target adjustment power is within the above-mentioned adjustable power range of the above-mentioned energy storage system, the above-mentioned target adjustment power represents the power that needs to be adjusted so that the above-mentioned closed-loop impact current passes the above-mentioned safety check; when the above-mentioned target adjustment power is within the above-mentioned adjustable power range of the above-mentioned energy storage system, the power of the above-mentioned energy storage system is adjusted. In this embodiment, by determining whether the target adjustment power is within the adjustable power range of the energy storage system, it can be ensured that the adjustment operation is performed within a safe and feasible range, avoiding power adjustment that exceeds the adjustment capacity of the energy storage system, thereby protecting the energy storage system from damage.

[0064] Specifically, Figure 3 As shown, the integrated photovoltaic, storage and charging power station includes a photovoltaic system (PV) (i.e., photovoltaic power generation system), an energy storage system (ESS, Energy Storage System), an electric vehicle (EV, Electric Vehicle) (i.e., charging station) and an energy management system. The energy management system is used to adjust the photovoltaic power generation system, the energy storage system and the charging station (i.e., electric vehicles on the grid). After a failure occurs in the distribution network, an instruction is sent through the energy management system to stop the charging service of the integrated photovoltaic, storage and charging power station. The photovoltaic, energy storage and (i.e., charging station) all enter the standby state. The real-time information of each subsystem (i.e., photovoltaic power generation system, energy storage system, charging station) is collected through the information channel to calculate the adjustable power range of the integrated photovoltaic, storage and charging power station. Within the adjustable power range of the integrated photovoltaic, storage and charging power station, when the target adjustment power is within the adjustable range of the energy storage system, the energy storage system is adjusted first. When the power to be adjusted exceeds the upper limit of the adjustable power of the energy storage system, the photovoltaic and electric vehicle supplementary power support is further considered.

[0065] Specifically, Figure 3 In the energy management system, the station monitoring system includes the station monitoring system, PV monitoring system, EV monitoring system and ESS monitoring system. The station monitoring system is used to monitor the equipment load (i.e., node load) such as the station lighting, the PV monitoring system is used to monitor the photovoltaic power generation system, the EV monitoring system is used to monitor electric vehicles, 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., photovoltaic power generation system, energy storage system, charging station, node load) through information channels. Figure 3 In the figure, AC (Alternating Current) / DC (Direct Current) represents the conversion between alternating current and direct current.

[0066] Specifically, Figure 4As shown in the figure, a distribution network with a photovoltaic storage and charging integrated power station is built, including nodes 0, 1 and 2. G1 represents the generator, PSCIS represents the photovoltaic storage and charging integrated power station, Z1 and Z2 represent the line impedance, and U N Indicates the rated voltage, is the voltage of each node, node 2 is the closing point, and the power regulation demand of the integrated photovoltaic storage and charging power station is analyzed; node 0 is taken as the balancing node, and the line-to-ground admittance and network loss are ignored. The following set of equations can be established by forward-backward substitution method:

[0067] in, is the transmission power of the line between node 0 and node 1, is the transmission power of the line between node 1 and node 2, is the load power of node 1, is the load power of node 2, is the output power of the integrated photovoltaic storage and charging power station at the closing point, is the voltage of each node. Solving the equations, we can get the active power P input from the photovoltaic storage and charging integrated power station to the distribution network: PSCIS (U m2 , δ m2 ) and reactive power Q PSCIS (U m2 , δ m2 ):

[0068] The actual adjustment power of the integrated photovoltaic storage and charging power station Should be within the pre-calculated total adjustable power range The specific expression is as follows:

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

[0070] Traditional generators control the output active power by adjusting the mechanical torque, while the control based on virtual synchronous generator can adjust the virtual mechanical power P m At the same time, the frequency deviation feedback command ΔP is introduced f , realize the grid-connected inverter active power instruction P ref After the active power-frequency droop characteristic control of the synchronous generator is introduced, in steady state, assuming that the frequency deviation feedback command satisfies ΔP f =-k f (f-f0), corresponding to the virtual mechanical power P of the synchronous generator mIt can be expressed as: P m =P ref -k f (f-f0), where k f is the active power regulation coefficient, f is the terminal voltage frequency of the virtual synchronous generator, and f0 is the rated frequency of the distribution network.

[0071] Traditional generators control the output reactive power and terminal voltage by adjusting the excitation, while the control based on virtual synchronous generators achieves the above parameter control by adjusting the virtual potential E. The virtual potential command value E consists of three parts: the no-load potential E0 of the virtual synchronous generator, the ΔE for adjusting the reactive power, and the Q Output ΔE corresponding to the excitation regulation or voltage regulation of the synchronous generator U After the reactive power-voltage droop characteristic control of the synchronous generator is introduced, that is: E=E0+ΔE U +ΔE Q ; After introducing reactive power-voltage droop control, ΔE Q =K Q (Q ref -Q), K Q is the reactive power regulation coefficient based on reactive power difference, Q ref is the inverter output reactive power reference command, Q is the actual value of the inverter output reactive power; ΔE U =K U (U ref -U), K U is the reactive power regulation coefficient based on voltage difference, U ref is the inverter output voltage reference instruction, and U is the actual output voltage.

[0072] Specifically, the target topology structure and control plan of the integrated photovoltaic storage and charging power station for each time period are finally generated and uploaded to the control center. After verification, the corresponding recovery instructions are issued to ensure feasibility in the entire fault recovery interval and improve the continuous power supply capacity of critical loads.

[0073] Specifically, in response to the shortcomings of the existing technology and the demand for distribution network fault recovery under extreme weather conditions, the present invention takes into account the spatiotemporal evolution characteristics of distribution network faults under extreme meteorological disasters and the problem of exceeding the limit of loop impact current, takes into account the interactive influence of fault repair resources and recovery methods, and proposes a method of supporting post-disaster load power supply and auxiliary loop closing of the distribution network (i.e., a fault recovery method of the distribution network) by utilizing the dispatchable potential of the integrated photovoltaic storage and charging power station through constructing a photovoltaic storage and charging power station model.

[0074] Specifically, the distribution network fault recovery method of the present application takes into account transient safety issues during switch switching while ensuring the minimization of operating costs and the maximization of power supply recovery rates for important loads, and incorporates the utilization of adjustable resources on the grid into the fault recovery method, which is beneficial to improving the process safety and feasibility of distribution network fault recovery; by combining the movement trajectory of disasters obtained from short-term meteorological forecast information, the distribution network fault recovery method of the present application takes into account the temporal and spatial evolution characteristics, overcomes the limitations of generating recovery plans for a single event section, and has better adaptability to disasters caused by extreme weather.

[0075] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the 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 flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0077] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the distribution network fault recovery method.

[0078] Specifically, the fault recovery method of the distribution network includes:

[0079] Step S201, obtaining distribution network data at the time of a fault, wherein the distribution network data includes distribution network structure parameters, distributed power supply state parameters, load state parameters, switch action unit cost, and user power outage cost. The distribution network structure parameters include branch connection conditions of the distribution network and corresponding geographic longitude and latitude information. The distributed power supply state parameters include the output of distributed power supplies in the distribution network. The load state parameters represent the power of node loads in the distribution network and the priority of the node loads. The switch action unit cost represents the cost generated by each switch operation in the distribution network. The user power outage cost represents the economic loss caused to the user due to power supply interruption. The fault time represents the time when the distribution network fails.

[0080] Step S202, obtaining meteorological data of the location of the distribution network during a fault recovery period, wherein the fault recovery period represents a period of recovery after a fault occurs in the distribution network;

[0081] Step S203, constructing a photovoltaic, energy storage and charging integrated power station model according to the above-mentioned meteorological data, and determining the total adjustable power range of the photovoltaic, energy storage and charging integrated power station model, wherein the photovoltaic, energy storage and charging integrated power station model includes a photovoltaic power generation system model, an energy storage system model and a charging station model, and the total adjustable power range represents the total power range that can be adjusted within the operating range of the photovoltaic, energy storage and charging integrated power station;

[0082] Step S204, drawing a moving track of the 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 according to the moving speed to obtain a plurality of different time periods;

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

[0084] Step S206, calculating the closed-loop impact current according to the target topology, and performing a safety check on the closed-loop impact current, wherein the closed-loop impact current represents a transient current generated by the target topology when performing a closed-loop operation;

[0085] Step S207, when the closed-loop impulse current fails to pass the safety check, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check.

[0086] Optionally, based on the distribution network data, reconstructing the network topology of the distribution network within the time period to obtain a target topology includes: determining the target function as follows: And determine the equality constraints as Where ε is the set of lines in the above distribution network, c′ ij and c ij is a binary variable, c′ ij represents the open and closed state of line ij before reconstruction, c ij represents the opening and closing state of line ij after reconstruction, N is the node load set in the above distribution network, ω i is the load weight of the i-th node load, b i is a binary variable, indicating the charged state of the i-th node load, P loadi is the active power of the i-th node load, Δt represents the fault duration, β1 represents the first weight, β2 represents the second weight, P ij represents the active power of line ij, Q ij Represents the reactive power U of line ij ij represents the voltage of line ij, I ijRepresents the current of line ij; according to the network structure constraints, the distribution network operation constraints and the above-mentioned equation constraints, the above-mentioned objective function is solved to minimize F1 and obtain the above-mentioned target topology structure, wherein the above-mentioned network structure constraints represent the constraints of the network topology structure of the above-mentioned distribution network, and the above-mentioned distribution network operation constraints represent the constraints of the above-mentioned distribution network during operation.

[0087] Optionally, according to the target topology, calculating the closed-loop impact current includes: according to the target topology, simplifying the impedance of the passive ring network into a series circuit, in which the resistor R and the inductor L are connected in series, and the passive ring network represents the network topology part that does not include the power supply in the target topology; determining the closed-loop impact current as

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

[0089] Optionally, the safety check of the closed-loop impulse current includes: determining whether the closed-loop impulse current satisfies a first condition, where the first condition is i(t) max ≤I l，max , where i(t) max is the maximum value of the above-mentioned closed-loop impulse current, I l，max is the preset maximum allowable current of the line, and the above-mentioned maximum allowable current of the line represents the maximum current value allowed to pass through the line in the above-mentioned target topology structure; when the above-mentioned closed-loop impact current does not meet the above-mentioned first condition, it is determined that the above-mentioned closed-loop impact current has not passed the above-mentioned safety check; when the above-mentioned closed-loop impact current meets the above-mentioned first condition, it is determined that the above-mentioned closed-loop impact current has passed the above-mentioned safety check.

[0090] Optionally, according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted so that the above-mentioned closed-loop impact current passes the above-mentioned safety check, including: according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted so that U2 and U3 meet the second condition, and the above-mentioned second condition is in,

[0091] Optionally, based on the above-mentioned meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and the total adjustable power range of the above-mentioned photovoltaic storage and charging integrated power station model is determined, including: based on the above-mentioned meteorological data, the above-mentioned photovoltaic power generation system model is established, and the adjustable power range of the photovoltaic power generation system is determined; based on the above-mentioned meteorological data, the above-mentioned energy storage system model is established, and the adjustable power range of the energy storage system is determined; based on the above-mentioned meteorological data, the above-mentioned charging station model is established, and the adjustable power range of the charging station is determined; based on the above-mentioned adjustable power range of the above-mentioned photovoltaic power generation system, the above-mentioned adjustable power range of the above-mentioned energy storage system and the above-mentioned adjustable power range of the above-mentioned charging station, the above-mentioned total adjustable power range is determined to be in, is the total adjustable power range at time t, is the adjustable power range of the photovoltaic power generation system at time t, is the adjustable power range of the energy storage system at time t, is the adjustable power range of the charging station at time t.

[0092] Optionally, according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted, including: determining whether the target adjustment power is within the above-mentioned adjustable power range of the above-mentioned energy storage system, the above-mentioned target adjustment power represents the power that needs to be adjusted so that the above-mentioned closed-loop impact current passes the above-mentioned safety check; when the above-mentioned target adjustment power is within the above-mentioned adjustable power range of the above-mentioned energy storage system, adjusting the power of the above-mentioned energy storage system.

[0093] The present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement at least the following method steps: step S201, obtaining distribution network data at the time of a fault, the distribution network data including distribution network structure parameters, distributed power supply state parameters, load state parameters, switch action unit cost and user power loss cost, the distribution network structure parameters including the branch connection status of the distribution network and the corresponding geographical longitude and latitude information, the distributed power supply state parameters including the output size of the distributed power supply in the distribution network, the load state parameters characterizing the power of the node load in the distribution network and the priority of the node load, the switch action unit cost represents the cost generated by each switch operation in the distribution network, the user power loss cost represents the economic loss caused to the user due to the power supply interruption, and the fault time represents the time when the distribution network fails; step S202, obtaining meteorological data of the location of the distribution network during the fault recovery period, the fault recovery period represents the period of recovery after the distribution network fails; step S203, constructing a photovoltaic storage and charging integrated power station model based on the meteorological data , and determine the total adjustable power range of the above-mentioned integrated photovoltaic storage and charging power station model, the above-mentioned integrated photovoltaic storage and charging power station model includes a photovoltaic power generation system model, an energy storage system model and a charging station model, and the above-mentioned total adjustable power range represents the total power range that can be adjusted by the integrated photovoltaic storage and charging power station within the operating range; step S204, according to the above-mentioned meteorological data, draw the movement trajectory of the meteorological disaster, and according to the above-mentioned movement trajectory and the above-mentioned meteorological data, determine the movement speed of the above-mentioned meteorological disaster, and divide the above-mentioned fault recovery period according to the above-mentioned movement speed to obtain a plurality of different time periods; step S205, according to the above-mentioned distribution network data, reconstruct the network topology structure of the above-mentioned distribution network in the above-mentioned time period to obtain a target topology structure; step S206, according to the above-mentioned target topology structure, calculate the closed-loop impulse current, and perform safety verification on the above-mentioned closed-loop impulse current, the above-mentioned closed-loop impulse current represents the transient current generated by the above-mentioned target topology structure when performing the closed-loop operation; step S207, when the above-mentioned closed-loop impulse current fails to pass the above-mentioned safety verification, adjust the power of the above-mentioned integrated photovoltaic storage and charging power station according to the above-mentioned total adjustable power range, so that the above-mentioned closed-loop impulse current passes the above-mentioned safety verification.

[0094] Optionally, based on the distribution network data, reconstructing the network topology of the distribution network within the time period to obtain a target topology includes: determining the target function as follows: And determine the equality constraints as Where ε is the set of lines in the above distribution network, c′ ij and c ij is a binary variable, c′ ijrepresents the open and closed state of line ij before reconstruction, c ij represents the opening and closing state of line ij after reconstruction, N is the node load set in the above distribution network, ω i is the load weight of the i-th node load, b i is a binary variable, indicating the charged state of the i-th node load, P loadi is the active power of the i-th node load, Δt represents the fault duration, β1 represents the first weight, β2 represents the second weight, P ij represents the active power of line ij, Q ij Represents the reactive power U of line ij ij represents the voltage of line ij, I ij Represents the current of line ij; according to the network structure constraints, the distribution network operation constraints and the above-mentioned equation constraints, the above-mentioned objective function is solved to minimize F1 and obtain the above-mentioned target topology structure, wherein the above-mentioned network structure constraints represent the constraints of the network topology structure of the above-mentioned distribution network, and the above-mentioned distribution network operation constraints represent the constraints of the above-mentioned distribution network during operation.

[0095] Optionally, according to the target topology, calculating the closed-loop impact current includes: according to the target topology, simplifying the impedance of the passive ring network into a series circuit, in which the resistor R and the inductor L are connected in series, and the passive ring network represents the network topology part that does not include the power supply in the target topology; determining the closed-loop impact current as

[0096]

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

[0098] Optionally, the safety check of the closed-loop impulse current includes: determining whether the closed-loop impulse current satisfies a first condition, where the first condition is i(t) max ≤I l，max , where i(t) max is the maximum value of the above-mentioned closed-loop impulse current, I l，maxis the preset maximum allowable current of the line, and the above-mentioned maximum allowable current of the line represents the maximum current value allowed to pass through the line in the above-mentioned target topology structure; when the above-mentioned closed-loop impact current does not meet the above-mentioned first condition, it is determined that the above-mentioned closed-loop impact current has not passed the above-mentioned safety check; when the above-mentioned closed-loop impact current meets the above-mentioned first condition, it is determined that the above-mentioned closed-loop impact current has passed the above-mentioned safety check.

[0099] Optionally, according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted so that the above-mentioned closed-loop impact current passes the above-mentioned safety check, including: according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted so that U2 and U3 meet the second condition, and the above-mentioned second condition is in,

[0100] Optionally, based on the above-mentioned meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and the total adjustable power range of the above-mentioned photovoltaic storage and charging integrated power station model is determined, including: based on the above-mentioned meteorological data, the above-mentioned photovoltaic power generation system model is established, and the adjustable power range of the photovoltaic power generation system is determined; based on the above-mentioned meteorological data, the above-mentioned energy storage system model is established, and the adjustable power range of the energy storage system is determined; based on the above-mentioned meteorological data, the above-mentioned charging station model is established, and the adjustable power range of the charging station is determined; based on the above-mentioned adjustable power range of the above-mentioned photovoltaic power generation system, the above-mentioned adjustable power range of the above-mentioned energy storage system and the above-mentioned adjustable power range of the above-mentioned charging station, the above-mentioned total adjustable power range is determined to be in, is the total adjustable power range at time t, is the adjustable power range of the photovoltaic power generation system at time t, is the adjustable power range of the energy storage system at time t, is the adjustable power range of the charging station at time t.

[0101] Optionally, according to the above-mentioned total adjustable power range, the power of the above-mentioned integrated photovoltaic storage and charging power station is adjusted, including: determining whether the target adjustment power is within the above-mentioned adjustable power range of the above-mentioned energy storage system, the above-mentioned target adjustment power represents the power that needs to be adjusted so that the above-mentioned closed-loop impact current passes the above-mentioned safety check; when the above-mentioned target adjustment power is within the above-mentioned adjustable power range of the above-mentioned energy storage system, adjusting the power of the above-mentioned energy storage system.

[0102] An embodiment of the present application also 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 are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the above-mentioned distribution network fault recovery methods.

[0103] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a 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 a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0104] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0105] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0106] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

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

[0109] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0110] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be 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 disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0111] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

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

[0113] In the fault recovery method of the distribution network of the present application, the distribution network data at the time of the fault is first obtained, and the meteorological data of the location of the distribution network during the fault recovery period is obtained; then, based on the meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and the total adjustable power range of the photovoltaic storage and charging integrated power station model is determined; then, based on the meteorological data, the movement trajectory of the meteorological disaster is drawn, and the movement speed of the meteorological disaster is determined; the fault recovery period is divided according to the movement speed to obtain a plurality of different time periods; and based on the distribution network data, the network topology structure of the distribution network within the time period is reconstructed to obtain the target topology structure; then, based on the target topology structure, the closed-loop impulse current is calculated, and the closed-loop impulse current is safety checked; when the closed-loop impulse current fails the safety check, the power of the photovoltaic storage and charging integrated power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check. Compared with the prior art which does not take into account the problem of low safety caused by transient changes in electrical quantities and their impact during the distribution network fault recovery process, the present application calculates the closed-loop impact current according to the target topology and performs a safety check on the closed-loop impact current. When the closed-loop impact current fails to pass the safety check, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range so that the closed-loop impact current passes the safety check. That is, the transient safety problem in the switch switching process is taken into account, and the utilization of the adjustable resources on the grid (that is, the integrated photovoltaic storage and charging power station) is incorporated into the fault recovery method, which is conducive to ensuring a high safety level in the distribution network fault recovery process. In addition, by combining the movement trajectory of meteorological disasters obtained from meteorological data and taking into account the spatiotemporal evolution characteristics of distribution network faults under extreme meteorological disasters, better adaptability to meteorological disasters caused by extreme weather is ensured.

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

Claims

1. A method for fault recovery of a distribution network, characterized in that: include: Acquire distribution network data at the time of fault, the distribution network data including distribution network structure parameters, distributed power supply state parameters, load state parameters, switch action unit cost and user power outage cost, the distribution network structure parameters including branch connection status of the distribution network and corresponding geographical longitude and latitude information, the distributed power supply state parameters including the output size of the distributed power supply in the distribution network, the load state parameters characterize the power of the node load in the distribution network and the priority of the node load, the switch action unit cost represents the cost generated by each switch operation in the distribution network, the user power outage cost represents the economic loss caused to the user due to the power supply interruption, and the fault time represents the time when the distribution network fails; Acquire meteorological data of the location of the distribution network during a fault recovery period, wherein the fault recovery period represents a period of recovery after a fault occurs in the distribution network; According to the meteorological data, a photovoltaic, energy storage and charging integrated power station model is constructed, and the total adjustable power range of the photovoltaic, energy storage and charging integrated power station model is determined. The photovoltaic, energy storage and charging integrated power station 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 can be adjusted within the operating range of the photovoltaic, energy storage and charging integrated power station; According to the meteorological data, a moving trajectory of the meteorological disaster is drawn, and according to the moving trajectory and the meteorological data, a moving speed of the meteorological disaster is determined, and the fault recovery period is divided according to the moving speed to obtain a plurality of different time periods; Reconstructing the network topology of the distribution network within the time period according to the distribution network data to obtain a target topology; According to the target topology, a closed-loop impact current is calculated, and a safety check is performed on the closed-loop impact current, wherein the closed-loop impact current represents a transient current generated when the target topology performs a closed-loop operation; When the closed-loop impulse current fails to pass the safety check, the power of the integrated photovoltaic storage and charging power station is adjusted according to the total adjustable power range so that the closed-loop impulse current passes the safety check.

2. The method for fault recovery of a distribution network according to claim 1, characterized in that: Reconstructing the network topology of the distribution network within the time period according to the distribution network data to obtain a target topology, including: According to the distribution network data, the objective function is determined as And determine the equality constraints as Where ε is the set of lines in the distribution network, c i ' j and c ij is a binary variable, c i ' j represents the open and closed state of line ij before reconstruction, c ij represents the opening and closing state of line ij after reconstruction, N is the node load set in the distribution network, ω i is the load weight of the i-th node load, b i is a binary variable, indicating the charged 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, β2 represents the second weight, P ij represents the active power of line ij, Q ij Represents the reactive power U of line ij ij represents the voltage of line ij, I ij represents the current of line ij; According to the network structure constraints, the distribution network operation constraints and the equation constraints, the objective function is solved to minimize F1 and obtain the target topology structure, wherein the network structure constraints represent the constraints of the network topology structure of the distribution network, and the distribution network operation constraints represent the constraints of the distribution network during operation.

3. The method for fault recovery of a distribution network according to claim 1, characterized in that: According to the target topology, the closed-loop inrush current is calculated, including: According to the target topology, the impedance of the passive ring network is simplified into a series circuit, in which a resistor R and an inductor L are connected in series, and the passive ring network represents a network topology portion of the target topology that does not include a power supply; Determine the closed-loop impact current as in, τ1=L / R, i(t) represents the closed-loop impulse current at time t, I m is the steady-state current amplitude of the target topology after the loop is closed, U2 is the voltage amplitude at the first end of the loop-closing point, U3 is the voltage amplitude at the second end of the loop-closing point, δ2 is the voltage phase angle at the first end of the loop-closing point, δ3 is the voltage phase angle at the second end of the loop-closing point, τ1 is the attenuation constant, t0 is the moment when the target topology performs the loop-closing operation, and ω is the angular frequency.

4. The method for fault recovery of a distribution network according to claim 3, characterized in that: The closed-loop impulse current is safety checked, including: Determine whether the closed-loop impulse current meets a first condition, wherein the first condition is i(t) max ≤I l,max , where i(t) max is the maximum value of the closed-loop impulse current, I l,max is a preset maximum allowable current of the line, wherein the maximum allowable current of the line represents the maximum current value allowed to pass through the line in the target topology structure; When the closed-loop impulse current does not satisfy the first condition, determining that the closed-loop impulse current fails to pass the safety check; When the closed-loop impact current satisfies the first condition, it is determined that the closed-loop impact current passes the safety check.

5. The method for fault recovery of a distribution network according to claim 4, characterized in that: According to the total adjustable power range, the power of the integrated photovoltaic storage and charging power station is adjusted so that the closed-loop impulse current passes the safety check, including: According to the total adjustable power range, the power of the integrated photovoltaic storage and charging power station is adjusted so that U2 and U3 meet the second condition, which is in, 6. The method for fault recovery of a distribution network according to claim 1, characterized in that: According to the meteorological data, a photovoltaic storage and charging integrated power station model is constructed, and a total adjustable power range of the photovoltaic storage and charging integrated power station model is determined, including: According to the meteorological data, the photovoltaic power generation system model is established, and the adjustable power range of the photovoltaic power generation system is determined; According to the meteorological data, the energy storage system model is established, and the adjustable power range of the energy storage system is determined; Establishing the charging station model according to the meteorological data, and determining an adjustable power range of the charging station; According to the adjustable power range of the photovoltaic power generation system, the adjustable power range of the energy storage system and the adjustable power range of the charging station, the total adjustable power range is determined to be in, is the total adjustable power range at time t, is the adjustable power range of the photovoltaic power generation system at time t, is the adjustable power range of the energy storage system at time t, is the adjustable power range of the charging station at time t.

7. The method for fault recovery of a distribution network according to claim 6, characterized in that: According to the total adjustable power range, adjusting the power of the photovoltaic storage and charging integrated power station includes: Determine whether the target regulated power is within the adjustable power range of the energy storage system, the target regulated power representing the power required to be regulated so that the closed-loop impulse current passes the safety check; When the target adjustment power is within the adjustable power range of the energy storage system, the power of the energy storage system is adjusted.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for fault recovery of the distribution network according to any one of claims 1 to 7.

9. A computer program product comprising computer instructions, characterized in that When the computer instructions are executed by a processor, the fault recovery method for the distribution network described in any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing a fault recovery method for a distribution network as described in any one of claims 1 to 7.

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