Relay protection method, device, equipment and medium for radiated power grid

Abstract

The present invention provides a relay protection method, device, equipment, and medium for a radiation power grid, which can be applied to the field of power system automation protection technology. The relay protection method includes: obtaining topological relationship information of a target radiation power grid; determining multiple target paths of the target radiation power grid according to attribute information and hierarchical relationship information; starting from the overcurrent protection device connected to the end node, configuring the initial delay protection duration for multiple overcurrent protection devices on each target path in order along each target path in a step-by-step manner according to the hierarchical relationship information between the nodes, to obtain the initial delay protection duration corresponding to each of the multiple overcurrent protection devices; and in response to multiple initial delay protection durations corresponding to the same overcurrent protection device, determining the maximum value of the multiple initial delay protection durations as the target delay protection duration.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation protection, and in particular to a relay protection method, device, equipment and medium for a radiation power grid. Background Art

[0002] The radial power grid is a common topological structure of low-voltage transmission and distribution networks. The relay protection of the main grid has been quite mature after years of development, while the relay protection of the distribution network has only been valued and developed in recent years. Therefore, most distribution network professionals have little understanding of the coordination between the relay protection of the distribution network and the terminal settings of the distribution line. Most of the terminal settings are set using the experience of other power supply bureaus, and the terminal setting principles and coordination with the distribution network relay protection in each case are unclear. Therefore, a method that can automatically calculate the overcurrent protection of the feeder terminal unit (FTU) or the distribution transformer unit (DTU) is needed to guide distribution network professionals to carry out the setting of distribution network protection settings.

[0003] The radial distribution network needs to reasonably set the overcurrent protection setting of each switch. The overcurrent protection setting is composed of the current amplitude setting Izd and the delay setting T. Among them, the delay setting T is an important guarantee for achieving the selectivity of overcurrent protection. When multiple branches of the radial power grid are configured with overcurrent protection, the selectivity of overcurrent protection action can be achieved through the coordination of time difference. However, the relay protection setting of the current distribution network is the same empirical value for the entire radial power grid. This results in the entire radial power grid tripping when a fault occurs at a node, resulting in a large power outage range and poor selectivity of overcurrent protection action. Summary of the invention

[0004] In view of the above problems, the present invention provides a relay protection method, device, equipment and medium for a radiation power grid.

[0005] According to one aspect of the present invention, a relay protection method for a radiation power grid is provided, comprising: obtaining topological relationship information of a target radiation power grid, wherein the topological relationship information represents attribute information of each node in the target radiation power grid and hierarchical relationship information between each node; determining multiple target paths of the target radiation power grid according to the attribute information and the hierarchical relationship information, wherein the target paths indicate information of multiple overcurrent protection devices installed on multiple lines from an initial node to multiple terminal nodes; configuring initial delay protection durations for multiple overcurrent protection devices on each target path in a step-by-step and incremental manner along each target path according to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the terminal node, to obtain initial delay protection durations corresponding to each of the multiple overcurrent protection devices; and in response to multiple initial delay protection durations corresponding to the same overcurrent protection device, determining the maximum value of the multiple initial delay protection durations as the target delay protection duration, so that when a fault occurs at the terminal node of the target radiation power grid, the multiple overcurrent protection devices perform relay protection actions according to the target delay protection duration.

[0006] According to an embodiment of the present invention, according to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the end node, initial delay protection durations are configured for multiple overcurrent protection devices on each target path step by step along each target path, and initial delay protection durations corresponding to each of the multiple overcurrent protection devices are obtained, including: according to the hierarchical relationship information between each node, determining the hierarchical order of the multiple overcurrent protection devices corresponding to each target path; according to the hierarchical order, starting from the overcurrent protection device connected to the end node, according to the predetermined protection interval duration, initial delay protection durations are configured for the multiple overcurrent protection devices step by step.

[0007] According to an embodiment of the present invention, in hierarchical order, starting from the overcurrent protection device connected to the end node, initial delay protection durations are configured for multiple overcurrent protection devices in sequence and step by step according to the predetermined protection interval duration, including: determining the predetermined delay protection duration of the overcurrent protection device connected to the end node; determining the hierarchical coefficients corresponding to each of the multiple overcurrent protection devices according to the hierarchical order; obtaining the delay protection parameters corresponding to each of the multiple overcurrent protection devices according to the hierarchical coefficients, the predetermined delay protection duration and the predetermined protection interval duration corresponding to each of the multiple overcurrent protection devices; and configuring the initial delay protection duration for the multiple overcurrent protection devices according to the delay protection parameters corresponding to each of the multiple overcurrent protection devices.

[0008] According to an embodiment of the present invention, the action execution durations of multiple overcurrent protection devices are obtained; and in response to the action execution duration of the overcurrent protection device of the kth level being greater than or equal to the initial delayed protection duration of the overcurrent protection device of the k+1th level, the predetermined protection interval duration is adjusted so that the initial delayed protection duration of the overcurrent protection device of the k+1th level is greater than the action execution duration of the overcurrent protection device of the kth level.

[0009] According to an embodiment of the present invention, the action execution durations of multiple overcurrent protection devices are obtained; and in response to the action execution duration of the overcurrent protection device of the k-th level being greater than or equal to the initial delayed protection duration of the overcurrent protection device of the k+1-th level, the initial delayed protection duration of the overcurrent protection device of the k+1-th level is adjusted so that the initial delayed protection duration of the overcurrent protection device of the k+1-th level is greater than the action execution duration of the overcurrent protection device of the k+1-th level.

[0010] According to an embodiment of the present invention, multiple target paths of a target radial power grid are determined based on attribute information and hierarchical relationship information, including: determining multiple terminal nodes from the target radial power grid based on the attribute information and hierarchical relationship information; and starting from the multiple terminal nodes, recursively searching the target radial power grid level by level to obtain multiple target paths.

[0011] According to an embodiment of the present invention, the information of multiple overcurrent protection devices includes an overcurrent protection device identification; in response to multiple initial delay protection time periods corresponding to the same overcurrent protection device, the maximum value of the multiple initial delay protection time periods is determined as the target delay protection time period, including: determining the multiple initial delay protection time periods corresponding to each overcurrent protection device in multiple target paths according to the overcurrent protection device identification; and obtaining the target delay protection time period corresponding to each overcurrent protection device by sequentially comparing the multiple initial delay protection time periods corresponding to the same overcurrent protection device.

[0012] Another aspect of the present invention provides a relay protection device for a radiated power grid, comprising: an acquisition module, a first determination module, a configuration module and a second determination module.

[0013] The acquisition module is used to acquire the topological relationship information of the target radiation power grid, wherein the topological relationship information represents the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node. The first determination module is used to determine multiple target paths of the target radiation power grid according to the attribute information and the hierarchical relationship information, wherein the target path indicates the information of multiple overcurrent protection devices installed on multiple lines from the initial node to multiple terminal nodes. The configuration module is used to configure the initial delay protection duration for multiple overcurrent protection devices on each target path in a step-by-step manner along each target path according to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the terminal node, to obtain the initial delay protection duration corresponding to each of the multiple overcurrent protection devices. The second determination module is used to determine the maximum value of the multiple initial delay protection durations as the target delay protection duration in response to multiple initial delay protection durations corresponding to the same overcurrent protection device, so that when a fault occurs at the terminal node of the target radiation power grid, multiple overcurrent protection devices perform relay protection actions according to the target delay protection duration.

[0014] The third aspect of the present invention provides an electronic device, comprising: one or more processors; a memory for storing one or more computer programs, wherein the one or more processors execute the one or more computer programs to implement the above-mentioned relay protection method for the radiation power grid.

[0015] The fourth aspect of the present invention further provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enables the processor to implement the above-mentioned relay protection method for the radiation power grid.

[0016] According to an embodiment of the present invention, by acquiring the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node, a target path containing information of multiple overcurrent protection devices is determined. According to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the end node, the initial delay protection duration is configured for the multiple overcurrent protection devices on each target path in a step-by-step manner along each target path, and the initial delay protection duration corresponding to each of the multiple overcurrent protection devices is obtained, and the maximum value of the multiple initial delay protection durations is determined as the target delay protection duration, so as to achieve the shortest delay protection duration and the fastest tripping of the end node, and the delay protection duration is gradually extended along the radiation power grid, so that when a fault occurs, the overcurrent protection switch close to the fault point will trip, reducing the scope of tripping and power outage, improving the selectivity of the overcurrent protection action, and optimizing the distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0018] Figure 1 An application scenario diagram of a relay protection method for a radiation power grid according to an embodiment of the present invention is shown;

[0019] Figure 2 A flow chart of a relay protection method for a radiation power grid according to an embodiment of the present invention is shown;

[0020] Figure 3 A flowchart of a method for configuring an initial delay protection duration according to an embodiment of the present invention is shown;

[0021] Figure 4 A flow chart showing a method for determining a predetermined delay protection duration by adjusting a predetermined protection interval duration according to an embodiment of the present invention is shown;

[0022] Figure 5 A flow chart showing a method for determining a predetermined delayed protection duration by adjusting an initial delayed protection duration of an upper-level overcurrent protection device according to an embodiment of the present invention is shown;

[0023] Figure 6 A flow chart of determining a target path according to an embodiment of the present invention is shown;

[0024] Figure 7 A schematic diagram of a line path obtained by searching a radial power grid according to an embodiment of the present invention is shown;

[0025] Figure 8 A structural block diagram of a relay protection device for a radiation power grid according to an embodiment of the present invention is shown;

[0026] Fig. 9 A block diagram of an electronic device suitable for implementing a relay protection method for a radiation power grid according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0027] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0028] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0029] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0030] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0031] The radial grid is a common topological structure for low-voltage transmission and distribution networks. The coordination relationship of the overcurrent protection devices installed in the line needs to be determined by the topological structure. For example, 220kV distance protection and 10kV overcurrent protection need to determine the coordination relationship between the various levels of relay protection according to the topological structure of the protected line. Since the coordination relationship between the various levels of protection is relatively complex and the protection coordination relationship modeling is complex, it is difficult to automatically determine the coordination relationship of the various levels of protection by a computer.

[0032] Remote control feeder automatic control systems are usually established through computer monitoring network systems and communication networks. The most important device it must use is the feeder terminal unit (FTU) with data collection and communication capabilities. Its functions are as follows: (1) When the power grid remains in normal working conditions, it can not only monitor the working conditions of remote feeder section switches and interconnecting switches in real time, but also monitor the corresponding feeder current and voltage changes, thereby achieving the purpose of remote opening and closing control of line switches; (2) Under fault conditions, fault records can be extracted, and automatic diagnosis and isolation of fault areas on the feeder can also be performed, and normal power supply to non-fault areas can be restored.

[0033] The terminal setting of the distribution transformer unit (DTU) of the distribution network relay protection and the centralized line is basically the coordination of the current setting and the time difference. The relay protection of the main grid has been quite mature after many years of development, while the distribution network has only been valued and developed in recent years. The complete equipment configuration and layout planning of the 10kV feeder automation line have only been determined in the past two years. Therefore, except for those who have done relay protection work before, most distribution network professionals do not understand the coordination between the relay protection of the distribution network and the terminal setting of the distribution line. Most of the terminal setting settings use the experience values ​​of other power supply bureaus, and are not clear about the terminal setting principles and coordination with the distribution network relay protection in each case. Therefore, a method that can automatically calculate the FTU or DTU overcurrent protection is needed to guide distribution network professionals to carry out the setting of distribution network protection settings.

[0034] The radial distribution network needs to reasonably set the overcurrent protection setting of each switch. The overcurrent protection setting is composed of the current amplitude setting Izd and the delay setting T. Among them, the delay setting T is an important guarantee for achieving the selectivity of overcurrent protection. When multiple branches of the radial power grid are configured with overcurrent protection, the selectivity of overcurrent protection action can be achieved through the coordination of time difference. However, the relay protection setting of the current distribution network is the same empirical value for the entire radial power grid. This results in the entire radial power grid tripping when a fault occurs at a node, resulting in a large power outage range and poor selectivity of overcurrent protection action.

[0035] In view of this, an embodiment of the present invention provides a relay protection method for a radiation power grid, which determines a target path containing multiple overcurrent protection device information by obtaining the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node. According to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the end node, the initial delay protection duration is configured for the multiple overcurrent protection devices on each target path step by step along each target path, and the initial delay protection duration corresponding to each of the multiple overcurrent protection devices is obtained, and the maximum value of the multiple initial delay protection durations is determined as the target delay protection duration, so as to achieve the shortest delay protection duration and the fastest tripping of the end node, and the delay protection duration is extended step by step along the radiation power grid, so that when a fault occurs, the overcurrent protection switch close to the fault point will trip, reduce the tripping power outage range, improve the selectivity of the overcurrent protection action, and optimize the distribution system.

[0036] Figure 1 An application scenario diagram of a relay protection method for a radiation power grid according to an embodiment of the present invention is shown.

[0037] like Figure 1 As shown, the application scenario 100 according to this embodiment may include a first terminal device 101, a network 102 and a server 103. The network 102 is used to provide a medium for a communication link between the first terminal device 101 and the server 103. The network 102 may include various connection types, such as wired, wireless communication links or optical fiber cables, etc.

[0038] The user can use the first terminal device 101 to interact with the server 103 through the network 102 to receive or send messages, etc. Various communication client applications can be installed on the first terminal device 101, such as shopping applications, web browser applications, search applications, instant messaging tools, email clients, social platform software, etc. (only for example).

[0039] The first terminal device 101 may be any electronic device with a display screen and supporting web browsing, including a laptop computer and a desktop computer, etc. The topological relationship of the target radiation power grid is input into the first terminal device 101 , and interacts with the server 103 through the network 102 .

[0040] The server 103 may be a server that provides various services, such as a background management server (only as an example) that provides support for websites browsed by the user using the first terminal device 101. The background management server may analyze and process the received data such as user requests, and feed back the processing results (such as web pages, information, or data obtained or generated according to user requests) to the terminal device.

[0041] It should be noted that the relay protection method for the radiation power grid provided in the embodiment of the present invention can generally be executed by the server 103. Accordingly, the relay protection device for the radiation power grid provided in the embodiment of the present invention can generally be set in the server 103. The relay protection method for the radiation power grid provided in the embodiment of the present invention can also be executed by a server or server cluster that is different from the server 103 and can communicate with the first terminal device 101 and / or the server 103. Accordingly, the relay protection device for the radiation power grid provided in the embodiment of the present invention can also be set in a server or server cluster that is different from the server 103 and can communicate with the first terminal device 101 and / or the server 103.

[0042] Alternatively, the relay protection method for the radiated power grid provided in the embodiment of the present invention may also be executed by the first terminal device 101, or may also be executed by other terminal devices different from the first terminal device 101. Accordingly, the relay protection device for the radiated power grid provided in the embodiment of the present invention may also be provided in the first terminal device 101, or may be provided in other terminal devices different from the first terminal device 101.

[0043] It should be understood that Figure 1 The number of terminal devices, networks and servers in the embodiment is only for illustration. Any number of terminal devices, networks and servers may be provided according to implementation requirements.

[0044] The following will be based on Figure 1 The scene described by Figure 2~Figure 7 The relay protection method for the radiation power grid according to the embodiment of the present invention is described in detail.

[0045] Figure 2 A flow chart of a relay protection method for a radiated power grid according to an embodiment of the present invention is shown.

[0046] like Figure 2 As shown, the relay protection method 200 of the radiated power grid of this embodiment includes operations S210 to S240.

[0047] In operation S210, topology relationship information of a target radiation power grid is acquired.

[0048] In operation S220, a plurality of target paths of the target radiation power grid are determined according to the attribute information and the hierarchical relationship information.

[0049] In operation S230, according to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the end node, the initial delay protection duration is configured for each target path in sequence along each target path in an incremental manner, and the initial delay protection duration corresponding to each of the multiple overcurrent protection devices is obtained.

[0050] In operation S240, in response to a plurality of initial delayed protection time periods corresponding to the same overcurrent protection device, a maximum value among the plurality of initial delayed protection time periods is determined as a target delayed protection time period.

[0051] According to an embodiment of the present invention, the topological relationship information represents the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node. Generally speaking, the attribute information includes the type, voltage level, load condition, and possible power supply point of each node in the radiation power grid. Among them, the node type can be a substation, a distribution transformer, a user node, etc. The hierarchical relationship information describes how the nodes are connected through lines to form a hierarchical structure from the power supply node to the end user.

[0052] According to an embodiment of the present invention, the target path indicates information of multiple overcurrent protection devices installed on multiple lines from the initial node to multiple terminal nodes. The overcurrent protection device may be a relay protection switch. For example, the target path is {substation switch, relay protection switch K1, relay protection switch K5, relay protection switch K9, relay protection switch K 10}.

[0053] According to an embodiment of the present invention, starting from the overcurrent protection device connected to the end node, the initial delay protection duration is configured for multiple overcurrent protection devices on each target path in order along each target path step by step, which means that the delay protection duration of the node closest to the fault point is the shortest, and the delay protection duration increases step by step in hierarchical order. For example: the delay protection duration of the overcurrent protection device of the end node n of a target path is configured to be 0.1s, the delay protection duration of the overcurrent protection device of the upper node n+1 is configured to be 0.35s, and the delay protection duration of the overcurrent protection device of the upper node n+2 is configured to be 0.6s.

[0054] According to an embodiment of the present invention, the same overcurrent protection device can belong to different target paths. Therefore, when the delayed protection durations are configured step by step for different target paths, the same overcurrent protection device will obtain multiple different initial delayed protection durations.

[0055] For example, the target path P1 is {substation switch, switch k1, switch k3}, and the target path P2 is {substation switch, switch k1, switch k5, switch k8}. It can be seen that switch k1 belongs to both the target path P1 and the target path P2. The initial delay protection time length is configured for the overcurrent protection device step by step. The configuration parameters of the target path P1 are {T ks =0.3, T1=0.2, T3=0.1}, the configuration parameters of the target path P2 are {T ks =0.4, T1=0.3, T5=0.2, T8=0.1}. Therefore, the initial delay protection time configured for switch k1 and substation switch has multiple values, namely T1=0.2s, 0.3s; T ks =0.3s, 0.4s.

[0056] If the maximum value in the set is not selected as the target delay protection duration, the target path P1 is {T ks =0.3, T1=0.2, T3=0.1}, the configuration parameters of the target path P2 are changed to {T ks =0.3, T1=0.2, T5=0.2, T8=0.1}, where T1=T5, which means that the tripping time of switch k1 after the fault occurs is the same as the tripping time of switch k5 which is closer to the fault point, and the protection over-tripping phenomenon will occur, increasing the scope of power outage. The maximum value in the set is selected as the target delay protection duration, and the target path obtained is: The target path P1 is {T ks =0.4, T1=0.3, T3=0.1}, the target path P2 is {T ks =0.4, T ,1 =0.3, T5=0.2, T8=0.1}, no protection over-tripping occurred.

[0057] Therefore, it is necessary to determine the maximum value among multiple initial delay protection durations as the target delay protection duration, so that when a fault occurs at the terminal node of the target radiation power grid, multiple overcurrent protection devices perform relay protection actions according to the target delay protection duration. If the target delay protection duration is not the maximum value among multiple initial delay protection durations, the tripping time of the current level protection will be equal to or less than the protection action time of the downstream power supply path, and the protection over-tripping phenomenon will occur.

[0058] According to an embodiment of the present invention, by obtaining the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node, a target path containing multiple overcurrent protection device information is determined. According to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the end node, the initial delay protection duration is configured for each of the multiple overcurrent protection devices on each target path step by step along each target path, and the initial delay protection duration corresponding to each of the multiple overcurrent protection devices is obtained, and the maximum value of the multiple initial delay protection durations is determined as the target delay protection duration. In order to achieve the shortest delay protection duration and the fastest tripping of the end node, and to extend the delay protection duration step by step along the radiation power grid, when a fault occurs, the overcurrent protection switch close to the fault point will trip, reducing the scope of tripping and power outage, improving the selectivity of overcurrent protection action, and optimizing the distribution system.

[0059] According to an embodiment of the present invention, according to the hierarchical relationship information between each node, starting from the overcurrent protection device connected to the end node, initial delay protection durations are configured for multiple overcurrent protection devices on each target path step by step along each target path, and initial delay protection durations corresponding to each of the multiple overcurrent protection devices are obtained, including: according to the hierarchical relationship information between each node, determining the hierarchical order of the multiple overcurrent protection devices corresponding to each target path; according to the hierarchical order, starting from the overcurrent protection device connected to the end node, according to the predetermined protection interval duration, initial delay protection durations are configured for the multiple overcurrent protection devices step by step.

[0060] According to an embodiment of the present invention, the hierarchical order of multiple overcurrent protection devices corresponding to each target path is determined according to the hierarchical relationship information between each node, for example: the end node is level 0, and it increases step by step toward the initial node along the target path, for example, it increases step by step toward the substation switch.

[0061] According to an embodiment of the present invention, the predetermined protection interval duration can be represented by ΔT, and the size of the predetermined protection interval duration can be determined according to actual line conditions, and is used to configure initial delayed protection durations for multiple overcurrent protection devices in a step-by-step manner.

[0062] According to an embodiment of the present invention, the hierarchical order of multiple overcurrent protection devices corresponding to each target path is determined according to the hierarchical relationship information between each node, and the initial delay protection duration of multiple overcurrent protection devices is gradually increased by setting a predetermined protection interval duration, rather than multiple overcurrent protection devices being configured with the same initial delay protection duration. This method can ensure that the end node closest to the fault point trips the fastest, and gradually extend the delay duration along the radiating power grid, thereby reducing the tripping range.

[0063] Figure 3A flow chart of a method for configuring an initial delay protection duration according to an embodiment of the present invention is shown.

[0064] like Figure 3 As shown, the method 300 for configuring the initial delay protection duration of this embodiment includes operations S331 to S335.

[0065] In operation S331, the hierarchical order of a plurality of overcurrent protection devices corresponding to each target path is determined according to the hierarchical relationship information between the nodes.

[0066] In operation S332, a hierarchical coefficient corresponding to each of the plurality of overcurrent protection devices is determined according to the hierarchical order.

[0067] In operation S333 , a predetermined delayed protection time length of the overcurrent protection device connected to the end node is determined.

[0068] In operation S334, delay protection parameters corresponding to each of the multiple overcurrent protection devices are obtained according to the level coefficients, predetermined delay protection durations, and predetermined protection interval durations corresponding to each of the multiple overcurrent protection devices.

[0069] In operation S335, initial delay protection durations are configured for the multiple overcurrent protection devices according to the delay protection parameters corresponding to the multiple overcurrent protection devices.

[0070] According to an embodiment of the present invention, the level coefficient is represented by s, which represents the level difference between the upper level overcurrent protection device and the current level overcurrent protection device. For example, the end node is level 0, and the upper level node is level 1. At this time, the level coefficient s between the two is 1. The predetermined delay protection time is represented by T0. The predetermined delay protection time represents the tripping time of the end node of the target path. The setting of T0 value can be set according to the actual situation and is the shortest delay value.

[0071] According to an embodiment of the present invention, the delay protection parameter includes a level coefficient s of the overcurrent protection device, a predetermined delay protection duration T0, and a predetermined protection interval duration ΔT. Configuring the initial delay protection duration for multiple overcurrent protection devices according to the delay protection parameters corresponding to each of the multiple overcurrent protection devices can be performed according to the following formula:

[0072] T = T0 + △T × s (1)

[0073] Where T represents the initial delay protection duration, T0 represents the predetermined delay protection duration, △T represents the predetermined protection interval duration, and s represents the level coefficient. Formula (1) means that the tripping time of the upper switch is set to T0+△T. Similarly, the tripping time of the upper switch with a phase difference of s levels is T0+△T×s.

[0074] For example: according to the topological relationship, set the predetermined delay protection time T0=0.1, △T=0.2, the end node is level 0, the upper node is level 1, and the initial node is level 2. Determine the delay protection parameters of each overcurrent protection device: T0=0.1, △T=0.2, s=0 of the end node; T0=0.1, △T=0.2, s=1 of the upper node; T0=0.1, △T=0.2, s=2 of the initial node. According to the above delay protection parameters, the initial delay protection time of each overcurrent protection device is obtained according to formula (1): T0=0.1 of the end node; T1=0.3 of the upper node; T2=0.5 of the initial node.

[0075] According to an embodiment of the present invention, by determining the delayed protection parameters of multiple overcurrent protection devices including the hierarchical coefficient, the predetermined delayed protection duration and the predetermined protection interval duration, the initial delayed protection duration is configured for multiple overcurrent protection devices. By reasonably establishing the relationship between the hierarchical coefficient, the predetermined delayed protection duration and the predetermined protection interval duration and the initial delayed protection duration, the initial delayed protection duration of the overcurrent protection device is gradually increased, the parameters of the overcurrent protection device are accurately configured, and the action efficiency when a fault occurs is improved.

[0076] According to an embodiment of the present invention, the overcurrent protection device may be a relay protection switch. It takes a certain amount of time for the relay protection switch to receive a tripping instruction and complete the tripping action instruction, rather than completing the instruction upon receiving the instruction. This leads to the following problem: when the action execution time (time to execute the tripping action) of the relay protection switch of a certain node n is greater than the initial delay protection time of the switch of the previous node n+1, the switch of a certain node n will not completely trip before the switch of n also starts to execute the tripping action, which will cause the relay protection switch far from the fault point to trip, resulting in a large power outage range. Therefore, it is necessary to meet the requirement that the initial delay protection time of the overcurrent protection device of the previous level is greater than the action execution time of the overcurrent protection device of this level.

[0077] Figure 4 A flow chart of determining a predetermined delay protection duration by adjusting a predetermined protection interval duration according to an embodiment of the present invention is shown.

[0078] like Figure 4 As shown, the method of determining a predetermined delay protection duration by adjusting a predetermined protection interval duration 400 in this embodiment includes operations S401 to S404.

[0079] In operation S401, the action execution durations of multiple overcurrent protection devices are obtained.

[0080] In operation S402, determine whether the action execution duration of the k-th level overcurrent protection device is greater than or equal to the initial delayed protection duration of the k+1-th level overcurrent protection device. If so, perform operation S403; if not, perform operation S404.

[0081] In operation S403, the predetermined protection interval duration is adjusted so that the initial delayed protection duration of the overcurrent protection device at the k+1th level is greater than the action execution duration of the overcurrent protection device at the kth level.

[0082] In operation S404, a predetermined delay protection duration is determined.

[0083] According to an embodiment of the present invention, when configuring the initial delayed protection duration of an overcurrent protection device, in the delay protection parameters involved, the setting of the predetermined protection interval duration △T can be adjusted according to actual conditions. Therefore, by adjusting the predetermined protection interval duration, the initial delayed protection duration of the overcurrent protection device at the k+1th level can be made greater than the action execution duration of the overcurrent protection device at the kth level.

[0084] For example, if the preset protection interval of the overcurrent protection device is 0.1s, the action execution time of the overcurrent protection device of the first level is 0.25s, and the initial delay protection time of the overcurrent protection device of the second level is 0.1s, then the action execution time of the overcurrent protection device of the first level is longer than the initial delay protection time of the overcurrent protection device of the second level. At this time, the preset protection interval is adjusted to 0.2s, and the updated initial delay protection time of the overcurrent protection device of the second level is 0.3s, which satisfies the requirement that the initial delay protection time of the overcurrent protection device of the k+1th level is longer than the action execution time of the overcurrent protection device of the kth level, and the initial delay protection time of the overcurrent protection device of the second level is determined to be 0.3s.

[0085] According to an embodiment of the present invention, the initial delayed protection duration of the overcurrent protection device at the previous level is adjusted by adjusting the predetermined protection interval duration, so that the initial delayed protection duration of the overcurrent protection device at the previous level is greater than the action execution duration of the overcurrent protection device at this level, which can avoid large-scale tripping and improve the selectivity of the action of the overcurrent protection device.

[0086] According to an embodiment of the present invention, generally speaking, the situation where the initial delayed protection duration of the overcurrent protection device at the k+1th level is shorter than the action execution duration of the overcurrent protection device at the kth level is only an individual case. Therefore, the above conditions can be met by individually fine-tuning the initial delayed protection duration of the overcurrent protection device at the k+1th level.

[0087] Figure 5 A flow chart is shown for determining a predetermined delayed protection duration by adjusting an initial delayed protection duration of an upper-level overcurrent protection device according to an embodiment of the present invention.

[0088] like Figure 5 As shown, the method of determining a predetermined delayed protection duration 500 by adjusting an initial delayed protection duration of an upper-level overcurrent protection device in this embodiment includes operations S501 to S504.

[0089] In operation S501, the action execution durations of multiple overcurrent protection devices are obtained.

[0090] In operation S502, determine whether the action execution duration of the k-th level overcurrent protection device is greater than or equal to the initial delayed protection duration of the k+1-th level overcurrent protection device. If so, perform operation S503; if not, perform operation S504.

[0091] In operation S503, the initial delayed protection duration of the overcurrent protection device at the k+1th level is adjusted so that the initial delayed protection duration of the overcurrent protection device at the k+1th level is greater than the action execution duration of the overcurrent protection device at the kth level.

[0092] In operation S504, a predetermined delay protection duration is determined.

[0093] According to an embodiment of the present invention, when configuring the initial delay protection duration of the overcurrent protection device, the parameter configuration is performed in a step-by-step manner. Therefore, when the initial delay protection duration of the overcurrent protection device at the k+1th level is less than the action execution duration of the overcurrent protection device at the kth level, the initial delay protection duration of the overcurrent protection device at the k+1th level can be directly fine-tuned.

[0094] For example, if the action execution time of the overcurrent protection device at the first level is 0.15s, and the initial delay protection time of the overcurrent protection device at the second level is 0.1s, then the action execution time of the overcurrent protection device at the first level is longer than the initial delay protection time of the overcurrent protection device at the second level. At this time, the initial delay protection time of the overcurrent protection device at the second level is directly adjusted to 0.2s, and the initial delay protection time of the overcurrent protection device at the k+1th level is longer than the action execution time of the overcurrent protection device at the kth level, then the initial delay protection time of the overcurrent protection device at the second level is determined to be 0.2s.

[0095] According to the embodiment of the present invention, by directly adjusting the initial delay protection duration of the overcurrent protection device of the k+1th level that does not meet the conditions, the requirement that the initial delay protection duration of the overcurrent protection device of the previous level is greater than the action execution duration of the overcurrent protection device of this level is achieved, thereby avoiding large-scale tripping and improving the selectivity of the overcurrent protection device action. In addition, individual fine-tuning achieves precise adjustment without adjusting the initial delay protection duration of all overcurrent protection devices, saving adjustment time and improving the operating efficiency of parameter adjustment.

[0096] Figure 6 A flow chart for determining a target path according to an embodiment of the present invention is shown.

[0097] like Figure 6 As shown, the target path determination 600 of this embodiment includes operations S621 to S622.

[0098] In operation S621 , a plurality of end nodes are determined from a target radiation grid according to the attribute information and the hierarchical relationship information.

[0099] In operation S622 , starting from a plurality of terminal nodes, a target radial grid is recursively searched level by level to obtain a plurality of target paths.

[0100] According to an embodiment of the present invention, the attribute information includes the node type. It is important to determine and distinguish the power node and the terminal node based on the attribute information. The hierarchical relationship information can be described as From power node A to node B, From node B to node C, From node C to terminal node D.

[0101] According to an embodiment of the present invention, based on attribute information and hierarchical relationship information, determining multiple terminal nodes from a target radial power grid includes: (1) searching for nodes in the distribution network that are characterized by appearing only at one end of the line; and (2) removing nodes whose node attribute is power supply, and the remaining nodes are terminal nodes.

[0102] According to an embodiment of the present invention, the recursive search can be performed by using a depth-first search (DFS) recursive search method to search for the line path from the power node to the terminal node. For each line on each path, if there is a switch on the line, the switch is stored in the protection path, thereby generating a protection path for installing protection through the line path, that is, generating a target path. The protection in each target path has a superior-subordinate coordination relationship.

[0103] According to an embodiment of the present invention, the level-by-level recursive search may also adopt a breadth-first search (Breadth-First Search, BFS) method.

[0104] According to an embodiment of the present invention, based on attribute information and hierarchical relationship information, multiple terminal nodes are determined from the target radiation power grid, and starting from the multiple terminal nodes, the target radiation power grid is recursively searched step by step to obtain multiple target paths. Through attribute information and hierarchical relationship information, it is possible to effectively distinguish between power supply nodes and terminal nodes to quickly obtain target path information. By recursively searching step by step to obtain multiple target paths, it can be ensured that all possible multiple possible paths from the power source to the end user are traversed. First, the line path is searched, and then the target path is generated, which realizes the decoupling of the topological connection relationship and the protection configuration relationship. When only the protection configuration changes, there is no need to search the topological connection relationship, which greatly reduces the amount of calculation.

[0105] According to an embodiment of the present invention, the information of multiple overcurrent protection devices includes an overcurrent protection device identification; in response to multiple initial delay protection time periods corresponding to the same overcurrent protection device, the maximum value of the multiple initial delay protection time periods is determined as the target delay protection time period, including: determining the multiple initial delay protection time periods corresponding to each overcurrent protection device in multiple target paths according to the overcurrent protection device identification; and obtaining the target delay protection time period corresponding to each overcurrent protection device by sequentially comparing the multiple initial delay protection time periods corresponding to the same overcurrent protection device.

[0106] According to an embodiment of the present invention, the overcurrent protection device identifier indicates different overcurrent protection devices. For example, the device identifier of the relay protection switch may be switch k1, switch k5, substation switch ks, etc. According to the overcurrent protection device identifier, multiple initial delay protection durations corresponding to each overcurrent protection device in multiple target paths are determined. For example, according to the overcurrent protection device identifier "substation switch ks", the corresponding initial delay protection duration is determined as "T ks ”.

[0107] According to an embodiment of the present invention, for a switch equipped with overcurrent protection, assuming that it belongs to m protection paths, the initial delay protection duration can be calculated by formula (1) as T1, T2, ..., T m The target delay protection time of the switch is T = max{T1, T2, ..., T m}.

[0108] According to an embodiment of the present invention, sequentially comparing multiple initial delayed protection time lengths corresponding to the same overcurrent protection device includes comparing the differences between the multiple initial delayed protection time lengths corresponding to the same overcurrent protection device, calculating the ratio between the multiple initial delayed protection time lengths corresponding to the same overcurrent protection device for comparison, etc.

[0109] According to an embodiment of the present invention, based on the overcurrent protection device identification, the multiple initial delay protection durations corresponding to each overcurrent protection device in multiple target paths are determined, which helps to quickly distinguish different overcurrent protection devices and configure the corresponding initial delay protection durations. By sequentially comparing the multiple initial delay protection durations corresponding to the same overcurrent protection device, the maximum value of the multiple initial delay protection durations is obtained to ensure that the tripping time of the current level protection is greater than the protection action time of the downstream power supply path, avoid the protection over-tripping phenomenon, and reduce the scope of power outages.

[0110] Figure 7 A schematic diagram of a line path obtained by searching a radial power grid according to an embodiment of the present invention is shown.

[0111] by Figure 7 Taking the line path shown as an example, the relay protection method for the radiation power grid according to the embodiment of the present invention is fully described.

[0112] First, by analyzing the topological connection relationship data table, the topological relationship information of the target radiation power grid is obtained, including the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node. According to the above information, the first end node 701, the second end node 702, the third end node 703, and the fourth end node 704 can be obtained. Removing the node connected to the power supply, the end nodes are the second end node 702, the third end node 703, and the fourth end node 704.

[0113] Use a depth-first recursive search method to search for the target path, such as Figure 7 As shown in the figure, three line paths can be searched out in the example network, and different paths are represented by short dashes, solid lines, and dotted lines respectively.

[0114] In the line path, the switches installed for protection include switch ks, switch k1, switch k4, switch k6, switch k8, switch k 10 .

[0115] Generate three target paths: (1) {ks, switch k1}; (2) {ks, switch k4, switch k6}; (3) {ks, switch k4, switch k8, switch k 10}.

[0116] After determining the target path, determine the target delay protection duration of the switch path by path.

[0117] Taking T0=0.1, △T=0.15 as an example, multiple initial delay protection durations of switches on each path are obtained.

[0118] Target path P1: {ks, switch k1}, T1=0.1, T ks =0.25

[0119] Target path P2: {ks, switch k4, switch k6}, T6=0.1, T4=0.25, T ks =0.4

[0120] Target path P3: {ks, switch k4, switch k8, switch k 10}, T 10 =0.1, T8=0.25, T4=0.4, T ks =0.55.

[0121] The maximum value among multiple initial delay protection durations is determined as the target delay protection duration of each switch: T ks =max{0.55,0.4,0.25}, so T ks =0.55; T1=max{0.1}, so T1=0.1; T4=max{0.25,0.4}, so T4=0.4; T6=max{0.1}, so T6=0.1; T8=max{0.25}, so T8=0.25; T 10 =max{0.1}, so T 10 =0.1.

[0122] The relay protection method for the radial power grid in the embodiment of the present invention performs a topological analysis on the radial distribution network, and automatically calculates the target delayed protection time T of the overcurrent protection according to the input overcurrent protection installation position, thereby realizing the intelligent setting of the delay setting in the distribution network overcurrent protection setting.

[0123] Intelligent setting of overcurrent protection in distribution networks is of great significance. Through automatic setting, the parameters of protection devices can be adjusted quickly and accurately to ensure timely action when a fault occurs, isolate the fault area, prevent the fault from expanding, reduce the scope and duration of power outages, and thus ensure the continuity and stability of power supply. At the same time, automatic setting technology optimizes protection coordination through intelligent algorithms and real-time data analysis, avoids false operation and refusal to operate, ensures that protection devices cooperate correctly when a fault occurs, and avoids secondary faults.

[0124] In addition, automatic setting has greatly improved operating efficiency, saved human resources, and reduced human errors. Faced with the ever-changing structure of the power grid, especially factors such as distributed energy access and load fluctuations, automatic setting technology can dynamically adjust protection parameters based on real-time monitoring data, adapt to changes in the power grid operating environment, and ensure the safe and stable operation of the power grid.

[0125] Data-driven automatic setting also optimizes protection strategies, improves the reliability and accuracy of protection devices, and provides a reference for the planning and transformation of power grids, ultimately reducing maintenance costs, reducing the need for manual intervention, reducing equipment failure rates, and extending equipment life. Therefore, the automatic setting of distribution network overcurrent protection not only improves the protection level of the power grid, but also lays the foundation for the intelligent development of the power grid, and helps to build a safer, more reliable, and more efficient modern power system.

[0126] Based on the above-mentioned relay protection method for the radiation power grid, the present invention also provides a relay protection device for the radiation power grid. Figure 8 The device is described in detail.

[0127] Figure 8 A structural block diagram of a relay protection device for a radiation power grid according to an embodiment of the present invention is shown.

[0128] like Figure 8 As shown, the abnormal device identification device 800 of this embodiment includes an acquisition module 810 , a first determination module 820 , a configuration module 830 and a second determination module 840 .

[0129] The acquisition module 810 is used to acquire the topological relationship information of the target radiation power grid, wherein the topological relationship information represents the attribute information of each node in the target radiation power grid and the hierarchical relationship information between each node. In one embodiment, the acquisition module 810 can be used to perform the operation S210 described above, which will not be repeated here.

[0130] The first determination module 820 is used to determine multiple target paths of the target radial power grid according to the attribute information and the hierarchical relationship information, wherein the target path indicates information of multiple overcurrent protection devices installed on multiple lines from the initial node to multiple terminal nodes. In one embodiment, the first determination module 820 can be used to perform the operation S220 described above, which will not be repeated here.

[0131] The configuration module 830 is used to configure the initial delay protection duration for the multiple overcurrent protection devices on each target path in order, starting from the overcurrent protection device connected to the end node, according to the hierarchical relationship information between the nodes, step by step along each target path, to obtain the initial delay protection duration corresponding to each of the multiple overcurrent protection devices. In one embodiment, the configuration module 830 can be used to perform the operation S230 described above, which will not be repeated here.

[0132] The second determination module 840 is used to determine the maximum value of the multiple initial delay protection time lengths as the target delay protection time length in response to multiple initial delay protection time lengths corresponding to the same overcurrent protection device, so that when a fault occurs at the end node of the target radiation power grid, the multiple overcurrent protection devices perform relay protection actions according to the target delay protection time length. In one embodiment, the second determination module 840 can be used to perform the operation S240 described above, which will not be repeated here.

[0133] According to an embodiment of the present invention, the configuration module may include a hierarchical order determination submodule and a configuration submodule.

[0134] The hierarchical order determination submodule is used to determine the hierarchical order of multiple overcurrent protection devices corresponding to each target path according to the hierarchical relationship information between the nodes. The configuration submodule is used to configure the initial delay protection duration for multiple overcurrent protection devices in sequence, starting from the overcurrent protection device connected to the end node, according to the predetermined protection interval duration, in a hierarchical order.

[0135] According to an embodiment of the present invention, the configuration submodule may include a first determining unit, a second determining unit, a third determining unit and a configuration unit.

[0136] The first determining unit is used to determine the predetermined delayed protection duration of the overcurrent protection device connected to the end node. The second determining unit is used to determine the hierarchical coefficient corresponding to each of the multiple overcurrent protection devices according to the hierarchical order. The third determining unit is used to obtain the delayed protection parameters corresponding to each of the multiple overcurrent protection devices according to the hierarchical coefficients, the predetermined delayed protection duration and the predetermined protection interval duration corresponding to each of the multiple overcurrent protection devices. The configuration unit is used to configure the initial delayed protection duration for the multiple overcurrent protection devices according to the delayed protection parameters corresponding to each of the multiple overcurrent protection devices.

[0137] According to an embodiment of the present invention, the above-mentioned device further includes: a first action execution duration acquisition module and a first adjustment module.

[0138] The first action execution duration acquisition module is used to acquire the action execution durations of multiple overcurrent protection devices. The first adjustment module is used to adjust the predetermined protection interval duration in response to the action execution duration of the overcurrent protection device at the kth level being greater than or equal to the initial delayed protection duration of the overcurrent protection device at the k+1th level, so that the initial delayed protection duration of the overcurrent protection device at the k+1th level is greater than the action execution duration of the overcurrent protection device at the kth level.

[0139] According to an embodiment of the present invention, the above-mentioned device further includes: a second action execution duration acquisition module and a second adjustment module.

[0140] The second action execution duration acquisition module is used to acquire the action execution durations of multiple overcurrent protection devices. The second adjustment module is used to adjust the initial delayed protection duration of the overcurrent protection device at the k+1th level in response to the action execution duration of the overcurrent protection device at the kth level being greater than or equal to the initial delayed protection duration of the overcurrent protection device at the k+1th level, so that the initial delayed protection duration of the overcurrent protection device at the k+1th level is greater than the action execution duration of the overcurrent protection device at the kth level.

[0141] According to an embodiment of the present invention, the first determining module includes a first determining submodule and a second determining submodule.

[0142] The first determination submodule is used to determine multiple terminal nodes from the target radiation power grid according to the attribute information and the hierarchical relationship information. The second determination submodule is used to recursively search the target radiation power grid level by level starting from the multiple terminal nodes to obtain multiple target paths.

[0143] According to an embodiment of the present invention, the information of the plurality of overcurrent protection devices includes overcurrent protection device identifiers. The second determination module includes a third determination submodule and a fourth determination submodule.

[0144] The third determination submodule is used to determine the multiple initial delay protection durations corresponding to each overcurrent protection device in the multiple target paths according to the overcurrent protection device identifier. The fourth determination submodule is used to obtain the target delay protection duration corresponding to each overcurrent protection device by sequentially comparing the multiple initial delay protection durations corresponding to the same overcurrent protection device.

[0145] According to an embodiment of the present invention, any multiple modules among the acquisition module 810, the first determination module 820, the configuration module 830, and the second determination module 840 can be combined into one module for implementation, or any one of the modules can be split into multiple modules. Alternatively, at least part of the functions of one or more of these modules can be combined with at least part of the functions of other modules and implemented in one module. According to an embodiment of the present invention, at least one of the acquisition module 810, the first determination module 820, the configuration module 830, and the second determination module 840 can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation methods of software, hardware, and firmware, or in any appropriate combination of any of them. Alternatively, at least one of the acquisition module 810, the first determination module 820, the configuration module 830, and the second determination module 840 can be at least partially implemented as a computer program module, and when the computer program module is run, the corresponding function can be executed.

[0146] Fig. 9 A block diagram of an electronic device suitable for implementing a relay protection method for a radiation power grid according to an embodiment of the present invention is shown.

[0147] like Fig. 9 As shown, the electronic device 900 according to an embodiment of the present invention includes a processor 901, which can perform various appropriate actions and processes according to the program stored in the ROM 902 or the program loaded from the storage part 908 to the RAM 903. The processor 901 may include, for example, a general-purpose microprocessor (such as a CPU), an instruction set processor and / or a related chipset and / or a special-purpose microprocessor (for example, an application-specific integrated circuit (ASIC)), etc. The processor 901 may also include an onboard memory for caching purposes. The processor 901 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present invention.

[0148] In RAM903, various programs and data required for the operation of electronic device 900 are stored. Processor 901, ROM902 and RAM903 are connected to each other via bus 904. Processor 901 performs various operations of the method flow according to an embodiment of the present invention by executing the program in ROM902 and / or RAM903. It should be noted that the program can also be stored in one or more memories other than ROM902 and RAM903. Processor 901 can also perform various operations of the method flow according to an embodiment of the present invention by executing the program stored in one or more memories.

[0149] According to an embodiment of the present invention, the electronic device 900 may further include an I / O interface 905, which is also connected to the bus 904. The electronic device 900 may further include one or more of the following components connected to the I / O interface 905: an input portion 906 including a keyboard, a mouse, etc.; an output portion 907 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage portion 908 including a hard disk, etc.; and a communication portion 909 including a network interface card such as a LAN card, a modem, etc. The communication portion 909 performs communication processing via a network such as the Internet. A drive 910 is also connected to the I / O interface 905 as needed. A removable medium 911, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 910 as needed, so that a computer program read therefrom is installed into the storage portion 908 as needed.

[0150] The present invention also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiment; or may exist independently without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present invention is implemented.

[0151] According to an embodiment of the present invention, a computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, an apparatus or a device. For example, according to an embodiment of the present invention, a computer-readable storage medium may include the ROM902 and / or RAM903 described above and / or one or more memories other than ROM902 and RAM903.

[0152] The embodiment of the present invention also includes a computer program product, which includes a computer program, and the computer program contains program code for executing the method shown in the flowchart. When the computer program product is run in a computer system, the program code is used to enable the computer system to implement the relay protection method for the radiation power grid provided by the embodiment of the present invention.

[0153] The computer program executes the above functions defined in the system / device of the embodiment of the present invention when it is executed by the processor 901. According to the embodiment of the present invention, the system, device, module, unit, etc. described above can be implemented by a computer program module.

[0154] In one embodiment, the computer program may be based on a tangible storage medium such as an optical storage device, a magnetic storage device, etc. In another embodiment, the computer program may also be transmitted and distributed in the form of a signal on a network medium, and downloaded and installed through the communication part 909, and / or installed from a removable medium 911. The program code contained in the computer program may be transmitted using any appropriate network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0155] In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 909, and / or installed from the removable medium 911. When the computer program is executed by the processor 901, the above functions defined in the system of the embodiment of the present invention are performed. According to the embodiment of the present invention, the system, device, means, module, unit, etc. described above can be implemented by a computer program module.

[0156] According to an embodiment of the present invention, the program code for executing the computer program provided by the embodiment of the present invention can be written in any combination of one or more programming languages. Specifically, these computing programs can be implemented using high-level process and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, Java, C++, python, "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, partially on the remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0157] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0158] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

[0159] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A relay protection method for a radiation power grid, characterized in that: include: Acquire topological relationship information of a target radiation power grid, wherein the topological relationship information represents attribute information of each node in the target radiation power grid and hierarchical relationship information between each node; Determine multiple target paths of the target radial power grid according to the attribute information and the hierarchical relationship information, wherein the target paths indicate information of multiple overcurrent protection devices installed on multiple lines from an initial node to multiple terminal nodes; According to the hierarchical relationship information between the nodes, starting from the overcurrent protection device connected to the end node, an initial delay protection duration is configured for each of the multiple overcurrent protection devices on the target path in sequence and in increasing order along each target path, so as to obtain the initial delay protection duration corresponding to each of the multiple overcurrent protection devices; Obtaining the execution time of actions of the multiple overcurrent protection devices; In response to the action execution time length of the overcurrent protection device at the kth level being greater than or equal to the initial delayed protection time length of the overcurrent protection device at the k+1th level, adjusting the predetermined protection interval time length so that the initial delayed protection time length of the overcurrent protection device at the k+1th level is greater than the action execution time length of the overcurrent protection device at the kth level; or in response to the action execution duration of the overcurrent protection device at the kth level being greater than or equal to the initial delayed protection duration of the overcurrent protection device at the k+1th level, adjusting the initial delayed protection duration of the overcurrent protection device at the k+1th level so that the initial delayed protection duration of the overcurrent protection device at the k+1th level is greater than the action execution duration of the overcurrent protection device at the kth level; In response to multiple delay protection time periods corresponding to the same overcurrent protection device, the delay protection time period is an initial delay protection time period or an adjusted delay protection time period; the maximum value of the multiple delay protection time periods is determined as a target delay protection time period, so that when a fault occurs at an end node of the target radiating power grid, the multiple overcurrent protection devices perform relay protection actions according to the target delay protection time period.

2. The method according to claim 1, characterized in that According to the hierarchical relationship information between the nodes, starting from the overcurrent protection device connected to the end node, an initial delay protection duration is configured for each of the multiple overcurrent protection devices on the target path in sequence and in increasing order along each target path, to obtain the initial delay protection duration corresponding to each of the multiple overcurrent protection devices, including: Determining the hierarchical order of the multiple overcurrent protection devices corresponding to each target path according to the hierarchical relationship information between the nodes; According to the hierarchical order, starting from the overcurrent protection device connected to the end node, the initial delayed protection durations are configured for the multiple overcurrent protection devices in sequence and in a step-by-step manner according to the predetermined protection interval duration.

3. The method according to claim 2, characterized in that The method of configuring the initial delayed protection durations for the multiple overcurrent protection devices in sequence, starting from the overcurrent protection device connected to the end node according to the hierarchical order and according to the predetermined protection interval duration, step by step and incrementally includes: Determining a predetermined delay protection duration of an overcurrent protection device connected to the end node; Determining, according to the hierarchical order, a hierarchical coefficient corresponding to each of the plurality of overcurrent protection devices; Obtaining a delay protection parameter corresponding to each of the multiple overcurrent protection devices according to the level coefficients corresponding to each of the multiple overcurrent protection devices, the predetermined delay protection duration, and the predetermined protection interval duration; and The initial delay protection durations are configured for the multiple overcurrent protection devices according to the delay protection parameters corresponding to each of the multiple overcurrent protection devices.

4. The method according to claim 1, characterized in that: The step of determining a plurality of target paths of the target radiation power grid according to the attribute information and the hierarchical relationship information includes: Determining a plurality of end nodes from the target radiation power grid according to the attribute information and the hierarchical relationship information; and Starting from the multiple terminal nodes, the target radial power grid is recursively searched level by level to obtain the multiple target paths.

5. The method according to claim 1, characterized in that The information of the multiple overcurrent protection devices includes an overcurrent protection device identifier; the response to the multiple initial delay protection durations corresponding to the same overcurrent protection device, determining the maximum value of the multiple initial delay protection durations as the target delay protection duration, including: Determining, according to the overcurrent protection device identifier, a plurality of initial delay protection durations corresponding to each overcurrent protection device in a plurality of target paths; and By sequentially comparing multiple initial delayed protection durations corresponding to the same overcurrent protection device, the target delayed protection duration corresponding to each overcurrent protection device is obtained.

6. A relay protection device for a radiation power grid, characterized in that: include: An acquisition module, used to acquire topological relationship information of a target radiation power grid, wherein the topological relationship information represents attribute information of each node in the target radiation power grid and hierarchical relationship information between each node; A first determination module is used to determine multiple target paths of the target radial power grid according to the attribute information and the hierarchical relationship information, wherein the target paths indicate information of multiple overcurrent protection devices installed on multiple lines from an initial node to multiple terminal nodes; A configuration module, configured to configure an initial delay protection duration for each of the multiple overcurrent protection devices on the target path in sequence, starting from the overcurrent protection device connected to the end node, according to the hierarchical relationship information between the nodes, step by step along each target path, to obtain an initial delay protection duration corresponding to each of the multiple overcurrent protection devices; An acquisition submodule, used for acquiring the action execution duration of the multiple overcurrent protection devices; A first adjustment submodule is configured to adjust the predetermined protection interval duration in response to the action execution duration of the overcurrent protection device of the kth level being greater than or equal to the initial delayed protection duration of the overcurrent protection device of the k+1th level, so that the initial delayed protection duration of the overcurrent protection device of the k+1th level is greater than the action execution duration of the overcurrent protection device of the kth level; or a second adjustment submodule, configured to adjust the initial delayed protection duration of the overcurrent protection device at the k+1th level in response to the action execution duration of the overcurrent protection device at the kth level being greater than or equal to the initial delayed protection duration of the overcurrent protection device at the k+1th level, so that the initial delayed protection duration of the overcurrent protection device at the k+1th level is greater than the action execution duration of the overcurrent protection device at the kth level; The second determination module is used to respond to multiple delayed protection time lengths corresponding to the same overcurrent protection device, where the delayed protection time length is an initial delayed protection time length or an adjusted delayed protection time length; and determine the maximum value of the multiple delayed protection time lengths as the target delayed protection time length, so that when a fault occurs at the end node of the target radiation power grid, the multiple overcurrent protection devices perform relay protection actions according to the target delayed protection time length.

7. An electronic device, characterized in that: include: one or more processors; a memory for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having executable instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor implements the method according to any one of claims 1 to 5.

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