Power distribution network fault adaptive processing method, device and equipment based on boundary switch

Abstract

The invention relates to a power distribution network fault adaptive processing method, device and equipment based on a boundary switch. The method comprises the following steps: acquiring a static topological structure of a power distribution network; acquiring voltage data and current data of each boundary switch in the static topological structure in real time, and calculating active power data according to the voltage data and the current data; determining a daytime tidal current direction for the daytime real-time active power data according to each boundary switch, and updating a node area according to the daytime tidal current direction to obtain a first updated real-time topological structure; determining a night tidal current direction for the night real-time active power data according to each boundary switch, and updating a node area according to the night tidal current direction and the daytime tidal current direction to obtain a second updated real-time topological structure; when the power distribution network breaks down, self-adaptive setting processing is carried out on the over-current threshold value of the fault boundary switch, fault protection of the power distribution network and self-adaptive updating of the topological structure are achieved, self-adaptive adjustment is carried out on the over-current threshold value of the fault boundary switch based on the fault of the power distribution network, and self-adaptive processing of the fault of the power distribution network is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of distribution network faults, and in particular to a method, device and equipment for adaptively processing distribution network faults based on a boundary switch. Background Art

[0002] Fault handling logic for distribution network boundary switches is a key technology for improving power supply reliability. The core goal of distribution networks is to rapidly isolate faulty areas and restore power to non-faulty areas through automated means. In traditional distribution networks, boundary switches typically implement fault isolation based on voltage-time or overcurrent protection principles. When an overcurrent or voltage anomaly is detected on a distribution network line, the switch operates according to a preset sequence (e.g., the upstream switch trips first with a delay, while the downstream switch locks out due to the lack of fault current detection). This, combined with communication coordination between the master station (SCADA / DMS) and the terminal (FTU / DTU), enables precise location and isolation of the faulted area. Typical applications include "trip first, then lockout" logic for user-side faults and multi-level timing coordination strategies for trunk lines. However, with the large-scale integration of distributed generation (DG) into distribution networks, distribution networks have evolved from a single-source radial structure to a complex network with multiple sources. The direction and magnitude of fault currents are uncertain, making traditional overcurrent protection prone to misjudging the fault direction. Furthermore, islanding at the DG connection point can cause unplanned power outages.

[0003] Existing methods address this issue from two perspectives: first, by introducing directional protection technology, which enhances fault direction identification by comparing voltage phase and current amplitude changes before and after a fault, combined with the frequency active support characteristics of the distributed generation (DG) grid-connected inverter; and second, by improving communication coordination logic, leveraging 5G or optical fiber to enable real-time data exchange between the master station, distributed generation controller, and demarcation switch, dynamically adjusting protection settings and implementing coordinated blocking strategies. Therefore, existing methods for handling demarcation switch faults in distributed capacitors connected to the distribution network cannot address the actual distribution network topology, leading to misjudgments that can impact the power supply reliability of the distribution network. Summary of the Invention

[0004] The present application provides a distribution network fault adaptive processing method, device and equipment based on a boundary switch, which is used to solve the technical problem that the existing boundary switch fault processing method for distributed capacitors connected to the distribution network cannot handle the fault according to the actual distribution network topology, and there is a misjudgment that affects the power supply reliability of the distribution network.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] On the one hand, a method for adaptively handling distribution network faults based on a boundary switch is provided, comprising the following steps:

[0007] Acquire a topological structure of the distribution network, and construct a static topological structure of the distribution network consisting of a substation, a boundary switch, and a node area according to the topological structure;

[0008] Acquire voltage data and current data of each demarcation switch in the static topology structure in real time; calculate based on the voltage data and current data of each demarcation switch to obtain active power data corresponding to each demarcation switch;

[0009] Determining the daytime flow direction of the corresponding demarcation switch according to the real-time active power data of each demarcation switch during the daytime; updating the node substation connected to the corresponding demarcation switch according to the daytime flow direction of each demarcation switch to obtain a first updated real-time topology structure;

[0010] Determining the nighttime power flow direction corresponding to each demarcation switch according to the real-time active power data of each demarcation switch at night; updating the node substation connected to the corresponding demarcation switch according to the nighttime power flow direction and the daytime power flow direction of each demarcation switch to obtain a second updated real-time topology structure;

[0011] If a fault occurs in the distribution network, adaptive setting processing is performed according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure to achieve fault protection of the distribution network.

[0012] Preferably, determining the daytime power flow direction corresponding to the demarcation switch according to the real-time active power data of each demarcation switch during the daytime or determining the nighttime power flow direction corresponding to the demarcation switch according to the real-time active power data of each demarcation switch at night comprises:

[0013] If the active power data is greater than a first threshold, the daytime current direction or the nighttime current direction is a positive current;

[0014] If the active power data is less than a first threshold, the daytime current direction or the nighttime current direction is a reverse current.

[0015] Preferably, updating the node substation connected to the corresponding demarcation switch according to the daytime flow direction of each demarcation switch to obtain a first updated real-time topology structure includes:

[0016] If the daytime flow direction of each of the boundary switches is a reverse flow, the node area connected to the boundary switch is changed to a distributed power source;

[0017] If the daytime flow direction of each of the boundary switches is a forward flow, the node area connected to the boundary switch is changed to a pure area user.

[0018] Preferably, updating the node substation connected to the corresponding demarcation switch according to the nighttime tidal flow direction and the daytime tidal flow direction of each demarcation switch to obtain the second updated real-time topology structure includes:

[0019] If the night flow direction of each demarcation switch is a reverse flow, the node area connected to the demarcation switch is changed to a distributed power source with energy storage;

[0020] If the daytime flow direction of each demarcation switch is consistent with its nighttime flow direction, the node area connected to the demarcation switch is changed to a pure area user;

[0021] If the daytime flow direction of each of the boundary switches is inconsistent with its nighttime flow direction, the node substation connected to the boundary switch is changed to a distributed power source.

[0022] Preferably, performing adaptive setting processing according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure to implement fault protection of the distribution network includes:

[0023] Obtain the faulty demarcation switch and record it as the fault demarcation switch. If the node area connected to the fault demarcation switch is a distributed power source, adjust the overcurrent threshold of the fault demarcation switch during the daytime and lock the overcurrent threshold of the fault demarcation switch for the reverse flow at night.

[0024] If the node area connected to the fault demarcation switch is a distributed power source with energy storage, the overcurrent threshold of the power flow of the fault demarcation switch is adjusted;

[0025] If the node substation connected to the fault demarcation switch is a pure substation user, the overcurrent threshold of the forward power flow of the fault demarcation switch is adjusted.

[0026] On the other hand, a distribution network fault adaptive processing device based on a demarcation switch is provided, comprising a topology construction module, a data acquisition module, a first topology update module, a second topology update module and a fault adaptive processing module;

[0027] The topology construction module is used to obtain the topology structure of the distribution network and construct a static topology structure of the distribution network consisting of a substation-demarcation switch-node area according to the topology structure;

[0028] The data acquisition module is used to acquire voltage data and current data of each demarcation switch in the static topology structure in real time; and calculate the active power data corresponding to each demarcation switch based on the voltage data and current data of each demarcation switch;

[0029] The first topology updating module is configured to determine the daytime power flow direction corresponding to each demarcation switch based on the real-time active power data of each demarcation switch during the daytime; and update the node substation connected to the corresponding demarcation switch based on the daytime power flow direction of each demarcation switch to obtain a first updated real-time topology structure.

[0030] The second topology updating module is configured to determine the night power flow direction corresponding to each demarcation switch based on the real-time active power data of each demarcation switch at night; and update the node substation connected to the corresponding demarcation switch based on the night power flow direction and the day power flow direction of each demarcation switch to obtain a second updated real-time topology structure.

[0031] The fault adaptive processing module is used to perform adaptive setting processing according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure according to the occurrence of a fault in the distribution network, so as to realize fault protection of the distribution network.

[0032] Preferably, the first topology update module is also used to change the node substation connected to each of the boundary switches into a distributed power source based on the daytime flow direction of each of the boundary switches being a reverse flow; and to change the node substation connected to the boundary switch into a pure substation user based on the daytime flow direction of each of the boundary switches being a forward flow.

[0033] Preferably, the second topology update module is also used to change the node substation connected to each boundary switch to a distributed power supply with energy storage according to the fact that the night flow direction of each boundary switch is a reverse flow; to change the node substation connected to the boundary switch to a pure substation user according to the fact that the daytime flow direction of each boundary switch is consistent with its nighttime flow direction; and to change the node substation connected to the boundary switch to a distributed power supply according to the fact that the daytime flow direction of each boundary switch is inconsistent with its nighttime flow direction.

[0034] Preferably, the fault adaptive processing module is also used to obtain the faulty boundary switch and record it as a fault boundary switch. If the node substation connected to the fault boundary switch is a distributed power source, the overcurrent threshold of the fault boundary switch flow during the day is adjusted, and the overcurrent threshold of the fault boundary switch for the reverse flow at night is locked; according to the fact that the node substation connected to the fault boundary switch is a distributed power source containing energy storage, the overcurrent threshold of the fault boundary switch flow is adjusted; according to the fact that the node substation connected to the fault boundary switch is a pure substation user, the overcurrent threshold of the forward flow of the fault boundary switch is adjusted.

[0035] In another aspect, a terminal device is provided, comprising a processor and a memory;

[0036] The memory is used to store program code and transmit the program code to the processor;

[0037] The processor is configured to execute the above-mentioned method for adaptively processing distribution network faults based on a boundary switch according to instructions in the program code.

[0038] The invention relates to a method, device and equipment for adaptively processing distribution network faults based on boundary switches. The method comprises obtaining a topological structure of the distribution network, and constructing a static topological structure of the distribution network consisting of a substation, a boundary switch and a node substation according to the topological structure; obtaining voltage data and current data of each boundary switch in the static topological structure in real time; calculating active power data corresponding to each boundary switch based on the voltage data and current data of each boundary switch; determining the daytime flow direction of the corresponding boundary switch based on the real-time active power data of each boundary switch during the daytime; updating the node substation connected to the corresponding boundary switch based on the daytime flow direction of each boundary switch to obtain a first updated real-time topological structure; determining the nighttime flow direction of the corresponding boundary switch based on the real-time active power data of each boundary switch at night; updating the node substation connected to the corresponding boundary switch based on the nighttime flow direction and daytime flow direction of each boundary switch to obtain a second updated real-time topological structure; and if a fault occurs in the distribution network, adaptive setting processing is performed based on the overcurrent threshold of the boundary switch in the first updated real-time topological structure or the second updated real-time topological structure to achieve fault protection of the distribution network.

[0039] It can be seen from the above technical solutions that the present application has the following advantages: the distribution network fault adaptive processing method based on the boundary switch determines the flow direction through active power data, and replaces the node substation connected to the boundary switch according to the flow direction of the boundary switch, thereby realizing the adaptive update of the distribution network topology structure. Based on the failure of the distribution network, the overcurrent threshold of the fault boundary switch of the first updated real-time topology structure or the second updated real-time topology structure is adaptively adjusted, and fault protection on the grid side and the distributed power supply side is automatically realized, thereby realizing adaptive processing of distribution network faults, solving the technical problem that the existing boundary switch fault processing method for distributed capacitors connected to the distribution network cannot perform fault processing according to the actual distribution network topology, and there is a misjudgment that affects the power supply reliability of the distribution network.

[0040] The distribution network fault adaptive processing device based on the boundary switch determines the flow direction through active power data through a topology construction module, a data acquisition module, a first topology update module, a second topology update module and a fault adaptive processing module, replaces the node substation connected to the boundary switch according to the flow direction of the boundary switch, and realizes the adaptive update of the distribution network topology structure. Based on the failure of the distribution network, the overcurrent threshold of the fault boundary switch of the first updated real-time topology structure or the second updated real-time topology structure is adaptively adjusted, and fault protection on the grid side and the distributed power supply side is automatically realized, thereby realizing adaptive processing of distribution network faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] Figure 1 This is a flowchart of the steps of the distribution network fault adaptive processing method based on the boundary switch according to the embodiment of the present application;

[0043] Figure 2 A topological relationship diagram of a static topological structure in the distribution network fault adaptive processing method based on a demarcation switch according to an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the fault location of the distribution network topology in the distribution network fault adaptive processing method based on the demarcation switch according to the embodiment of the present application;

[0045] Figure 4 This is a schematic diagram of a framework of a distribution network fault adaptive processing device based on a boundary switch according to an embodiment of the present application;

[0046] Figure 5 This is a schematic diagram of the terminal device described in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; internal connections between two components, or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0050] This patent application term:

[0051] Setting means that before electrical equipment is put into normal operation, the normal operating current of the equipment must be tested to see if it is within the setting current range of the upper protection switch.

[0052] Positive power flow refers to the same direction as the substation flow.

[0053] Reverse power flow refers to the flow direction opposite to that of the substation.

[0054] The embodiments of the present application provide a method, device and equipment for adaptively handling distribution network faults based on a boundary switch, which solves the technical problem that the existing method for handling boundary switch faults for distributed capacitors connected to the distribution network cannot handle faults according to the actual distribution network topology, and there is a possibility of misjudgment affecting the power supply reliability of the distribution network.

[0055] Example 1:

[0056] Figure 1 This is a flowchart of the steps of the distribution network fault adaptive processing method based on the boundary switch according to the embodiment of the present application. Figure 2 This is a topology relationship diagram of the static topology structure in the distribution network fault adaptive processing method based on the boundary switch described in the embodiment of the present application.

[0057] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a distribution network fault adaptive processing method based on a boundary switch, comprising the following steps:

[0058] S1. Obtain the topological structure of the distribution network, and construct a static topological structure of the distribution network consisting of a substation, a boundary switch, and a node area based on the topological structure.

[0059] It should be noted that the topology of the distribution network is obtained in step S1, and then the static topology of the distribution network consisting of substation-boundary switch-station area is established according to the terminal nodes of the topology, such as Figure 2 In this embodiment, the node area can be a pure area user, a distributed power supply, and a distributed power supply with energy storage. The distribution network fault adaptive processing method based on the boundary switch also includes uniformly configuring parameters of each boundary switch to obtain topology information.

[0060] S2. Acquire voltage data and current data of each demarcation switch in the static topology structure in real time; calculate based on the voltage data and current data of each demarcation switch to obtain active power data corresponding to each demarcation switch.

[0061] It should be noted that in step S2, the static topology structure is obtained according to step S1, and then the distribution network is operated according to the static topology structure and the configured topology information, and the voltage data and current data of each boundary switch in the static topology structure are obtained in real time; then, the active power data corresponding to each boundary switch is obtained by multiplying the voltage data and current data obtained for each boundary switch.

[0062] S3. Determine the daytime flow direction of the corresponding boundary switch according to the real-time active power data of each boundary switch during the day; update the node area connected to the corresponding boundary switch according to the daytime flow direction of each boundary switch to obtain the first updated real-time topology.

[0063] It should be noted that in step S3, the daytime flow direction is determined based on the active power data of each demarcation switch during the day obtained in step S2, and the topology of the distribution network is adaptively updated based on the data to obtain the first updated real-time topology.

[0064] S4. Determine the night flow direction of the corresponding boundary switch according to the real-time active power data of each boundary switch at night; update the node station area connected to the corresponding boundary switch according to the night flow direction and day flow direction of each boundary switch to obtain a second updated real-time topology structure.

[0065] It should be noted that in step S3, the nighttime flow direction is determined based on the active power data of each demarcation switch obtained in step S2, and the topology of the distribution network is adaptively updated based on the active power data and the daytime flow direction of the same demarcation switch to obtain a second updated real-time topology, which provides a topology for adaptively adjusting the overcurrent threshold of the faulty demarcation switch when a fault occurs in the subsequent distribution network. This distribution network fault adaptive processing method based on the demarcation switch determines the flow direction by obtaining the active power data in step S2, and then replaces the node substation connected to the demarcation switch according to the flow direction of the demarcation switch, so that the distribution network can adaptively update the topology relationship according to construction and transformation, and can also realize the construction of a topological structure with topological relationships including pure substation users, distributed power sources, and distributed power sources with energy storage.

[0066] S5. If a fault occurs in the distribution network, adaptive setting processing is performed according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure to achieve fault protection of the distribution network.

[0067] It should be noted that in step S5, based on the occurrence of a distribution network fault, the overcurrent threshold of the fault demarcation switch of the first updated real-time topology structure obtained in step S3 or the second updated real-time topology structure obtained in step S4 is adaptively adjusted to automatically implement fault protection on the grid side and the distributed power supply side, thereby achieving adaptive processing of distribution network faults. For example, if the distribution network fault occurs during the day, the overcurrent threshold of the fault demarcation switch of the first updated real-time topology structure is adaptively adjusted to automatically implement fault protection on the grid side and the distributed power supply side, thereby achieving adaptive processing of distribution network faults. If the distribution network fault occurs at night, the overcurrent threshold of the fault demarcation switch of the second updated real-time topology structure is adaptively adjusted to automatically implement fault protection on the grid side and the distributed power supply side, thereby achieving adaptive processing of distribution network faults. In this embodiment, the distribution network fault adaptive processing method based on the demarcation switch solves the problem of distributed power supply already connected to the distribution network, pure substation users being retrofitted and connected, and pure substation users being adaptive fault processing of the demarcation switch, making the fault resolution process simpler, reducing the verification response time, alleviating the burden of distribution network equipment transformation, and reducing the massive processing work of large-scale distributed power supply access to the distribution network.

[0068] The present application provides a method for adaptively processing distribution network faults based on boundary switches, comprising obtaining a topological structure of the distribution network, and constructing a static topological structure of the distribution network consisting of a substation-boundary switch-node substation according to the topological structure; obtaining voltage data and current data of each boundary switch in the static topological structure in real time; calculating active power data corresponding to each boundary switch based on the voltage data and current data of each boundary switch; determining the daytime flow direction of the corresponding boundary switch based on the real-time active power data of each boundary switch during the day; updating the node substation connected to the corresponding boundary switch based on the daytime flow direction of each boundary switch to obtain a first updated real-time topological structure; determining the nighttime flow direction of the corresponding boundary switch based on the real-time active power data of each boundary switch at night; updating the node substation connected to the corresponding boundary switch based on the nighttime flow direction and daytime flow direction of each boundary switch to obtain a second updated real-time topological structure; if a fault occurs in the distribution network, adaptive adjustment processing is performed based on the overcurrent threshold of the boundary switch in the first updated real-time topological structure or the second updated real-time topological structure to achieve fault protection of the distribution network. The adaptive processing method for distribution network faults based on the boundary switch determines the flow direction through active power data, replaces the node substation connected to the boundary switch according to the flow direction of the boundary switch, realizes the adaptive update of the distribution network topology structure, and adaptively adjusts the overcurrent threshold of the fault boundary switch of the first updated real-time topology structure or the second updated real-time topology structure based on the distribution network fault, automatically realizes fault protection on the grid side and the distributed power supply side, and further realizes the adaptive processing of distribution network faults, which solves the technical problem that the existing method for processing the boundary switch fault of the distributed capacitor connected to the distribution network cannot process the fault according to the actual distribution network topology and has the problem of misjudgment affecting the power supply reliability of the distribution network.

[0069] In one embodiment of the present application, determining the daytime power flow direction of the corresponding demarcation switch according to the real-time active power data of each demarcation switch during the daytime or determining the nighttime power flow direction of the corresponding demarcation switch according to the real-time active power data of each demarcation switch at nighttime includes:

[0070] If the active power data is greater than the first threshold, the daytime current direction or the nighttime current direction is a positive current;

[0071] If the active power data is less than the first threshold, the daytime current direction or the nighttime current direction is a reverse current.

[0072] It should be noted that the first threshold can be set according to needs. In this embodiment, the first threshold can be 0.

[0073] In one embodiment of the present application, updating the node substation connected to the corresponding demarcation switch according to the daytime flow direction of each demarcation switch to obtain the first updated real-time topology structure includes:

[0074] If the daytime flow direction of each boundary switch is reverse flow, the node area connected to the boundary switch is changed to a distributed power source;

[0075] If the daytime flow direction of each boundary switch is forward flow, the node substation connected to the boundary switch will be changed to a pure substation user.

[0076] It should be noted that during the day, the forward and reverse flow relationship of each boundary switch node is identified based on the active power data passing through the boundary switch itself; the node substation in the topology of the distribution network is updated and identified. If the flow is reverse, the node substation connected to the boundary switch is changed to a distributed power source. If the flow remains unchanged (such as forward flow), the node substation connected to the boundary switch is replaced with a pure substation user, and the topological relationship of the distribution network is updated to obtain the first updated real-time topology structure.

[0077] In one embodiment of the present application, updating the node area connected to the corresponding demarcation switch according to the nighttime flow direction and the daytime flow direction of each demarcation switch to obtain the second updated real-time topology structure includes:

[0078] If the night flow direction of each boundary switch is reverse flow, the node area connected to the boundary switch is changed to a distributed power source with energy storage;

[0079] If the daytime flow direction of each demarcation switch is consistent with its nighttime flow direction, the node area connected to the demarcation switch will be changed to a pure area user;

[0080] If the daytime flow direction of each boundary switch is inconsistent with its nighttime flow direction, the node area connected to the boundary switch will be changed to a distributed power source.

[0081] It should be noted that at night, the relationship between the forward and reverse power flows of each demarcation switch node is identified through the active power data of each demarcation switch itself; the node substations of the distribution network topology are updated and identified. If the power flow is reversed, the node substation connected to the demarcation switch is changed to a distributed power source with energy storage. If the power flow direction of the demarcation switch during the day is consistent with the power flow direction of the demarcation switch at night, the node substation connected to the demarcation switch is replaced with a pure substation user. If the power flow direction of the demarcation switch during the day is inconsistent with the power flow direction of the demarcation switch at night, the node substation connected to the demarcation switch is retained as a distributed power source, and the topology of the distribution network is updated to obtain a second updated real-time topology structure.

[0082] In an embodiment of the present application, the distribution network fault adaptive processing method based on the boundary switch responds to the newly connected distributed power sources and the cancelled distributed power sources of the pure substation users through steps S1 to S4, and updates the topology of the distribution network in real time.

[0083] Figure 3 This is a schematic diagram of the fault point location of the distribution network topology in the distribution network fault adaptive processing method based on the boundary switch described in the embodiment of the present application.

[0084] like Figure 3 As shown, in the case of a distributed power source, if a fault occurs on both sides of the demarcation switch (also known as the fault demarcation switch) connected to the distributed power source, the overcurrent value of the fault demarcation switch will be significantly different. If a fault occurs on the large side of the fault demarcation switch (such as fault point 2), the current value at the fault demarcation switch and the switch to the substation is large, with the same amplitude and direction. If a fault occurs on the small side of the fault demarcation switch (such as fault point 1), the current value at the fault demarcation switch and the switch to the substation has a large amplitude difference and is in the opposite direction. Therefore, in one embodiment of the present application, adaptive setting processing is performed based on the overcurrent threshold of the demarcation switch in the first updated real-time topology structure or the second updated real-time topology structure to achieve fault protection of the distribution network, including:

[0085] Obtain the faulty boundary switch and record it as the fault boundary switch. If the node area connected to the fault boundary switch is a distributed power source, adjust the overcurrent threshold of the fault boundary switch flow during the day and block the overcurrent threshold of the fault boundary switch for reverse flow at night.

[0086] If the node area connected to the fault boundary switch is a distributed power source with energy storage, the overcurrent threshold of the fault boundary switch power flow is adjusted;

[0087] If the node substation connected to the fault boundary switch is a pure substation user, the overcurrent threshold of the forward power flow of the fault boundary switch shall be adjusted.

[0088] It should be noted that the overvoltage threshold and overcurrent threshold for forward power flow of distributed generation (DGs) connected to the fault demarcation switch during the day are set to protect against faults on both the grid and DG sides of the fault demarcation switch. The overcurrent threshold for reverse power flow of the fault demarcation switch is blocked at night. The overcurrent threshold for the power flow of DGs with energy storage connected to the fault demarcation switch (regardless of forward and reverse power flow during the day or night) is set to protect against faults on both the grid and DG sides of the fault demarcation switch. The overcurrent threshold for forward power flow of substation-only users (regardless of day or night) connected to the fault demarcation switch is set to protect against substation faults.

[0089] Example 2:

[0090] Figure 4 This is a schematic diagram of the framework of the distribution network fault adaptive processing device based on the boundary switch according to the embodiment of the present application.

[0091] like Figure 4 As shown, the embodiment of the present application provides a distribution network fault adaptive processing device based on a demarcation switch, including a topology construction module 10, a data acquisition module 20, a first topology update module 30, a second topology update module 40 and a fault adaptive processing module 50;

[0092] A topology construction module 10 is used to obtain the topology structure of the distribution network and construct a static topology structure of the distribution network consisting of a substation, a boundary switch, and a node area according to the topology structure;

[0093] The data acquisition module 20 is used to obtain the voltage data and current data of each demarcation switch in the static topology structure in real time; and calculate the active power data corresponding to each demarcation switch based on the voltage data and current data of each demarcation switch;

[0094] A first topology updating module 30 is configured to determine the daytime power flow direction of each demarcation switch based on the daytime real-time active power data of each demarcation switch; and to update the node substation connected to the corresponding demarcation switch based on the daytime power flow direction of each demarcation switch to obtain a first updated real-time topology structure.

[0095] The second topology updating module 40 is configured to determine the nighttime power flow direction of each demarcation switch based on the real-time active power data of each demarcation switch at night; and to update the node substation connected to the corresponding demarcation switch based on the nighttime power flow direction and the daytime power flow direction of each demarcation switch to obtain a second updated real-time topology structure.

[0096] The fault adaptive processing module 50 is used to perform adaptive setting processing according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure according to a fault in the distribution network, so as to realize fault protection of the distribution network.

[0097] It should be noted that the contents of the modules in the apparatus of Example 2 have been described in the contents of the steps in the method of Example 1. In this embodiment, the contents of the modules of the distribution network fault adaptive processing apparatus based on the demarcation switch are not repeated. In this embodiment, the distribution network fault adaptive processing apparatus based on the demarcation switch determines the flow direction through active power data through the topology construction module, the data acquisition module, the first topology update module, the second topology update module and the fault adaptive processing module, and replaces the node substation connected to the demarcation switch according to the flow direction of the demarcation switch to achieve adaptive update of the distribution network topology structure. Based on the occurrence of a fault in the distribution network, the overcurrent threshold of the fault demarcation switch of the first updated real-time topology structure or the second updated real-time topology structure is adaptively adjusted to automatically achieve fault protection on the grid side and the distributed power supply side, thereby achieving adaptive processing of distribution network faults.

[0098] In an embodiment of the present application, the first topology update module 30 is also used to change the node substation connected to each boundary switch to a distributed power source if the daytime flow direction of the boundary switch is a reverse flow; and to change the node substation connected to the boundary switch to a pure substation user if the daytime flow direction of each boundary switch is a forward flow.

[0099] In an embodiment of the present application, the second topology update module 40 is also used to change the node substation connected to each boundary switch to a distributed power supply with energy storage based on the night flow direction of each boundary switch being a reverse flow; to change the node substation connected to the boundary switch to a pure substation user based on the daytime flow direction of each boundary switch being consistent with its nighttime flow direction; and to change the node substation connected to the boundary switch to a distributed power supply based on the daytime flow direction of each boundary switch being inconsistent with its nighttime flow direction.

[0100] In an embodiment of the present application, the fault adaptive processing module 50 is also used to obtain the faulty boundary switch and record it as a fault boundary switch. If the node substation connected to the fault boundary switch is a distributed power source, the overcurrent threshold of the fault boundary switch flow during the day is adjusted, and the overcurrent threshold of the fault boundary switch for the reverse flow at night is locked; according to the fact that the node substation connected to the fault boundary switch is a distributed power source containing energy storage, the overcurrent threshold of the fault boundary switch flow is adjusted; according to the fact that the node substation connected to the fault boundary switch is a pure substation user, the overcurrent threshold of the forward flow of the fault boundary switch is adjusted.

[0101] Example 3:

[0102] Figure 5 This is a schematic diagram of the terminal device described in an embodiment of the present application.

[0103] like Figure 5 As shown, an embodiment of the present application provides a terminal device, including a processor and a memory;

[0104] A memory, configured to store program codes and transmit the program codes to a processor;

[0105] The processor is configured to execute the above-mentioned distribution network fault adaptive processing method based on the boundary switch according to the instructions in the program code.

[0106] It should be noted that the processor is configured to execute the steps of the embodiment of the above-mentioned method for adaptively handling distribution network faults based on a demarcation switch according to the instructions in the program code. Alternatively, the processor implements the functions of the modules / units in the above-mentioned system / device embodiments when executing the computer program.

[0107] For example, a computer program may be divided into one or more modules / units, one or more of which are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0108] Terminal devices can be computing devices such as desktop computers, laptops, PDAs, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will appreciate that this does not constitute a limitation on terminal devices and may include more or fewer components than shown, or a combination of certain components, or different components. For example, terminal devices may also include input / output devices, network access devices, buses, and the like.

[0109] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0110] Memory can be an internal storage unit of a terminal device, such as a hard drive or memory. It can also be an external storage device, such as a plug-in hard drive, a SmartMedia Card (SMC), a Secure Digital (SD) card, or a flash memory card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or is about to be output.

[0111] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0112] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0113] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0114] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0115] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0116] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A distribution network fault adaptive processing method based on a boundary switch, characterized in that: The following steps are involved: Acquire a topological structure of the distribution network, and construct a static topological structure of the distribution network consisting of a substation, a boundary switch, and a node area according to the topological structure; Acquire voltage data and current data of each demarcation switch in the static topology structure in real time; calculate based on the voltage data and current data of each demarcation switch to obtain active power data corresponding to each demarcation switch; Determining the daytime flow direction of the corresponding demarcation switch according to the real-time active power data of each demarcation switch during the daytime; updating the node substation connected to the corresponding demarcation switch according to the daytime flow direction of each demarcation switch to obtain a first updated real-time topology structure; Determining the nighttime power flow direction corresponding to each demarcation switch according to the real-time active power data of each demarcation switch at night; updating the node substation connected to the corresponding demarcation switch according to the nighttime power flow direction and the daytime power flow direction of each demarcation switch to obtain a second updated real-time topology structure; If a fault occurs in the distribution network, adaptive setting processing is performed according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure to achieve fault protection of the distribution network.

2. The method for adaptively processing distribution network faults based on a boundary switch according to claim 1, characterized in that: Determining the daytime power flow direction corresponding to the demarcation switch according to the real-time active power data of each demarcation switch during the daytime or determining the nighttime power flow direction corresponding to the demarcation switch according to the real-time active power data of each demarcation switch at nighttime includes: If the active power data is greater than a first threshold, the daytime current direction or the nighttime current direction is a positive current; If the active power data is less than a first threshold, the daytime current direction or the nighttime current direction is a reverse current.

3. The method for adaptively processing distribution network faults based on a boundary switch according to claim 1, characterized in that: The first updated real-time topology structure is obtained by updating the node area connected to the corresponding demarcation switch according to the daytime flow direction of each demarcation switch. If the daytime flow direction of each of the boundary switches is a reverse flow, the node area connected to the boundary switch is changed to a distributed power source; If the daytime flow direction of each of the boundary switches is a forward flow, the node area connected to the boundary switch is changed to a pure area user.

4. The method for adaptively processing distribution network faults based on a boundary switch according to claim 1, characterized in that: The second updated real-time topology structure is obtained by updating the node area connected to the corresponding demarcation switch according to the nighttime tidal flow direction and the daytime tidal flow direction of each demarcation switch. If the night flow direction of each demarcation switch is a reverse flow, the node area connected to the demarcation switch is changed to a distributed power source with energy storage; If the daytime flow direction of each demarcation switch is consistent with its nighttime flow direction, the node area connected to the demarcation switch is changed to a pure area user; If the daytime flow direction of each of the boundary switches is inconsistent with its nighttime flow direction, the node substation connected to the boundary switch is changed to a distributed power source.

5. The method for adaptively processing distribution network faults based on a boundary switch according to any one of claims 1 to 4, characterized in that: Performing adaptive setting processing according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure to implement fault protection of the distribution network includes: Obtain the faulty demarcation switch and record it as the fault demarcation switch. If the node area connected to the fault demarcation switch is a distributed power source, adjust the overcurrent threshold of the fault demarcation switch during the daytime and lock the overcurrent threshold of the fault demarcation switch for the reverse flow at night. If the node area connected to the fault demarcation switch is a distributed power source with energy storage, the overcurrent threshold of the fault demarcation switch power flow is adjusted; If the node substation connected to the fault demarcation switch is a pure substation user, the overcurrent threshold of the forward power flow of the fault demarcation switch is adjusted.

6. A distribution network fault adaptive processing device based on a boundary switch, characterized in that: include: A topology construction module, a data acquisition module, a first topology update module, a second topology update module, and a fault adaptive processing module; The topology construction module is used to obtain the topology structure of the distribution network and construct a static topology structure of the distribution network consisting of a substation-demarcation switch-node area according to the topology structure; The data acquisition module is used to acquire voltage data and current data of each demarcation switch in the static topology structure in real time; and calculate the active power data corresponding to each demarcation switch based on the voltage data and current data of each demarcation switch; The first topology updating module is configured to determine the daytime power flow direction corresponding to each demarcation switch based on the real-time active power data of each demarcation switch during the daytime; and update the node substation connected to the corresponding demarcation switch based on the daytime power flow direction of each demarcation switch to obtain a first updated real-time topology structure. The second topology updating module is configured to determine the night power flow direction corresponding to each demarcation switch based on the real-time active power data of each demarcation switch at night; and update the node substation connected to the corresponding demarcation switch based on the night power flow direction and the day power flow direction of each demarcation switch to obtain a second updated real-time topology structure. The fault adaptive processing module is used to perform adaptive setting processing according to the overcurrent threshold of the boundary switch in the first updated real-time topology structure or the second updated real-time topology structure according to the occurrence of a fault in the distribution network, so as to realize fault protection of the distribution network.

7. The distribution network fault adaptive processing device based on a boundary switch according to claim 6, characterized in that: The first topology update module is also used to change the node substation connected to each demarcation switch to a distributed power source based on the daytime flow direction of each demarcation switch being a reverse flow; and to change the node substation connected to each demarcation switch to a pure substation user based on the daytime flow direction of each demarcation switch being a forward flow.

8. The distribution network fault adaptive processing device based on a boundary switch according to claim 6, characterized in that: The second topology update module is further configured to change the node area connected to each demarcation switch to a distributed power supply with energy storage based on the night flow direction of each demarcation switch being a reverse flow; and to change the node area connected to each demarcation switch to a pure area user based on the day flow direction of each demarcation switch being consistent with its night flow direction; According to the inconsistency between the daytime flow direction of each demarcation switch and its nighttime flow direction, the node substation connected to the demarcation switch is changed to a distributed power source.

9. The distribution network fault adaptive processing device based on a boundary switch according to any one of claims 6 to 8, characterized in that: The fault adaptive processing module is also used to obtain the faulty boundary switch and record it as the fault boundary switch. If the node substation connected to the fault boundary switch is a distributed power source, the overcurrent threshold of the fault boundary switch flow during the day is adjusted, and the overcurrent threshold of the fault boundary switch for the reverse flow at night is locked; according to the fact that the node substation connected to the fault boundary switch is a distributed power source with energy storage, the overcurrent threshold of the fault boundary switch flow is adjusted; according to the fact that the node substation connected to the fault boundary switch is a pure substation user, the overcurrent threshold of the forward flow of the fault boundary switch is adjusted.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the distribution network fault adaptive processing method based on a boundary switch according to any one of claims 1 to 5 according to the instructions in the program code.

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