Small power supply automatic intertripping method and device in case of power grid fault

Abstract

The invention discloses a small power supply automatic intertripping method and device during power grid fault, and relates to the technical field of power grid safety, power grid information is acquired, the power grid information comprises a power grid structure and hardware information in a power grid, and a power grid model is constructed based on the power grid information; monitoring operation information in the power grid in real time, providing the operation information to the power grid model in real time to obtain a power grid operation model, and monitoring the state of the power grid in real time; performing fault analysis on the power grid operation model to obtain fault information, and transmitting the fault information to a corresponding small power supply; and disconnecting the small power supply from the power grid through the small power supply splitting tangent point. Fault information can be transmitted to the small power supply, follow-up intertripping of the power grid and the small power supply is facilitated through the small power supply splitting tangency point, quick response to the power grid fault can be better carried out, and the fault position is obtained through the position of the disconnected simulation node to obtain the corresponding position in the power grid operation model. Fault analysis and judgment can be rapidly carried out, and the method is comprehensive and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid safety, and in particular to a method and device for automatically switching on a small power source when a power grid fails. Background Art

[0002] Failures are inevitable during the operation of the power grid. In order to quickly and accurately handle faults, prevent accidents from expanding, and protect the safety of power grid equipment and power users, the power system needs to take effective fault handling measures. As an important fault handling method, the small power automatic cut-off device can quickly cut off the small power supply when a power grid fault occurs. However, it is difficult to ensure the accuracy of fault analysis during the collection of power grid faults, and then there is no good response capability in the subsequent small power cut-off, and it is difficult to reduce its further impact on the power grid. Summary of the invention

[0003] The purpose of the present invention is to provide a method and device for automatically switching small power sources when a power grid fails, so as to solve the shortcomings of the background technology.

[0004] In order to achieve the above object, the present invention provides the following technical solution: a method for automatically switching a small power source when a power grid fails, comprising the following steps: Acquire power grid information, wherein the power grid information includes power grid structure and hardware information in the power grid, and construct a power grid model based on the power grid information; Monitor the operation information in the power grid in real time, and provide the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid status in real time.

[0005] Perform fault analysis on the power grid operation model to obtain fault information, and transmit the fault information to the corresponding small power source.

[0006] The small power source is disconnected from the grid through the small power source disconnection point.

[0007] In a preferred embodiment, the step of constructing a power grid model based on power grid information includes: Acquire the grid structure and hardware information in the grid as grid information; Construct a physical model as nodes based on the hardware information in the power grid, and connect the nodes according to the power grid structure to obtain a topological structure diagram; The corresponding cloud server is configured according to the topology diagram as the power grid model.

[0008] In a preferred embodiment, the step of monitoring the operation information in the power grid in real time and providing the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid state in real time includes: Real-time monitoring of the operation information in the power grid, where the operation information includes the current and voltage in the power grid structure; Obtain corresponding operation information corresponding to the power grid information, and mark the operation information corresponding to the power grid information in the power grid model; The operation information is stored in the power grid model according to the timestamp to obtain the power grid operation model, and the power grid status is monitored in real time through the power grid operation model.

[0009] In a preferred embodiment, the step of performing fault analysis on the power grid operation model to obtain fault information and transmitting the fault information to the corresponding small power source includes: Formulate a power grid fault library, combine the power grid operation model with the power grid fault library to obtain fault information, wherein the fault information includes the fault type and the fault location; A corresponding small power source is determined based on the fault information and transmitted to the small power source.

[0010] In a preferred embodiment, the step of formulating a power grid fault library and combining the power grid operation model with the power grid fault library to obtain fault information includes: Formulate multiple power grid fault operation information intervals and corresponding fault types as a power grid fault library, wherein the power grid fault operation information interval includes a simulation interval, multiple nodes in the simulation interval, and fault types for multiple nodes in the simulation interval, a single power grid fault operation information interval corresponds to a single fault type for multiple nodes in the simulation interval, and multiple nodes are simulated to be electrically connected to each other; The power grid operation model is copied according to the number of operation information intervals of the power grid fault, and the copied multiple power grid operation models are put into the simulation interval; The nodes covered by the power grid operation model in the simulation interval are taken as simulation nodes, and the simulation nodes are simulated and connected according to the power grid structure; Based on the fault types of multiple nodes in the simulation interval, scenario simulations are performed on multiple nodes respectively to obtain simulated operation information; The fault type and fault location corresponding to the operation information in the power grid operation model corresponding to the simulated operation information are used as fault information.

[0011] In a preferred embodiment, the step of simulating electrical connection between the multiple nodes comprises: A simulation board is set in the simulation interval, and multiple nodes are set in the simulation board; Multiple nodes are connected in pairs to obtain multiple node groups, and corresponding connection rules are formulated in the multiple node groups, wherein the connection rules include connection types and corresponding connection features.

[0012] In a preferred embodiment, the step of determining the corresponding small power source based on the fault information and transmitting it to the small power source includes: Determine the corresponding small power supply based on the fault information; Transmit fault information to small power sources based on the grid operation model.

[0013] In a preferred embodiment, the step of disconnecting the small power source from the power grid by disconnecting the small power source from the grid includes: After the small power source receives the fault information, it confirms the operation information of the corresponding power grid; The confirmed fault information prompts the small power disconnection point, and the small power is disconnected from the power grid through the small power disconnection point.

[0014] The present invention also provides a small power supply automatic switching device when a power grid fails, comprising: An acquisition module is used to acquire power grid information, wherein the power grid information includes power grid structure and hardware information in the power grid, and to construct a power grid model based on the power grid information; The monitoring module is connected to the acquisition module and is used to monitor the operation information in the power grid in real time, and provide the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid status in real time.

[0015] The analysis module is connected to the monitoring module and is used to perform fault analysis on the power grid operation model to obtain fault information and transmit the fault information to the corresponding small power source.

[0016] The disconnection module is connected to the analysis module and is used to disconnect the small power source from the power grid through the small power source disconnection point.

[0017] In the above technical solution, the technical effects and advantages provided by the present invention are: 1. The present invention can obtain the fault location in the power grid operation model according to the fault information, and thus can obtain the small power supply that controls the fault location, and then can transmit the fault information to the small power supply, so as to facilitate the subsequent joint switching of the power grid and the small power supply through the small power supply disconnection point, and can better respond to the power grid fault quickly; 2. The present invention can obtain a simulated node connection relationship of the corresponding power grid operation model through the covered nodes. Nodes other than the simulated nodes do not participate in the connection relationship of the simulated nodes. Then, the simulated nodes are simulated and connected according to the power grid structure. Based on the fault types of multiple nodes in the simulation interval, scenario simulations are performed on multiple nodes respectively to obtain simulated operation information. The fault location is obtained by obtaining the corresponding position in the power grid operation model through the position of the disconnected simulation node, which can quickly analyze and judge the fault in a relatively comprehensive and accurate manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 The figure is a flow chart of the method of the present invention.

[0020] Figure 2 It is a system block diagram of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1, please refer to Figure 1 As shown, the method for automatically switching a small power source when a power grid fails described in this embodiment includes the following steps: S1. Acquire power grid information, wherein the power grid information includes power grid structure and hardware information in the power grid, and construct a power grid model based on the power grid information; S2. Monitor the operation information in the power grid in real time, and provide the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid status in real time.

[0023] S3. Perform fault analysis on the power grid operation model to obtain fault information, and transmit the fault information to the corresponding small power source.

[0024] S4, disconnecting the small power source from the power grid through the small power source disconnection point; As described in the above steps S1-S4, during the operation of the power grid, faults are inevitable. In order to quickly and accurately handle faults, prevent accidents from expanding, and protect the safety of power grid equipment and power users, the power system needs to take effective fault handling measures. As an important fault handling means, the small power supply automatic cutting device can quickly cut off the small power supply when a fault occurs in the power grid. However, it is difficult to ensure the accuracy of fault analysis in the process of collecting power grid faults, and then there is no good response capability when the small power supply is cut in the subsequent process, and it is difficult to reduce its further impact on the power grid. In the present application, the fault location in the power grid operation model can be obtained according to the fault information, so the small power supply that controls the fault location can be obtained, and then the fault information can be transmitted to the small power supply, so that the power grid and the small power supply can be cut in the subsequent process of decoupling the small power supply point, so as to better respond to the power grid fault quickly; a simulated node connection relationship of the corresponding power grid operation model can be obtained through the covered nodes, and the nodes other than the simulated nodes do not participate in the connection relationship of the simulated nodes. Then, the simulated nodes are simulated according to the power grid structure. Based on the fault types of multiple nodes in the simulation interval, scenario simulations are performed on multiple nodes respectively to obtain simulated operation information. The fault location is obtained by the position of the disconnected simulation node corresponding to the position in the power grid operation model, which can quickly analyze and judge the fault, and is relatively comprehensive and accurate.

[0025] In one embodiment, the step S1 of constructing a power grid model based on power grid information includes: S11, obtaining a power grid structure and hardware information in the power grid as power grid information; S12, constructing a physical model as nodes according to the hardware information in the power grid, and connecting the nodes according to the power grid structure to obtain a topological structure diagram; S13, configuring a corresponding cloud server corresponding to the topology diagram as a power grid model; As described in the above steps S11-S13, the power grid structure and the hardware information in the power grid are obtained, wherein the power grid structure is the connection structure of the power grid and the connection structure and method between the hardware in the power grid and the power grid, and the hardware information in the power grid includes the hardware name, function and location in the power grid. The power grid structure and the hardware information in the power grid are used as power grid information. The information of the power grid monitored for fault can be obtained through the power grid information. Then, an irrational model is constructed according to the hardware information in the power grid information as the nodes constructed in the topology structure. The nodes corresponding to the hardware information in the power grid are connected accordingly according to the power grid structure to obtain a topology structure diagram. The topology structure diagram is configured with a corresponding cloud server as a power grid model, which can facilitate the subsequent analysis of the power grid model operation information.

[0026] In one embodiment, the step S2 of real-time monitoring of the operation information in the power grid and providing the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid state in real time includes: S21. Real-time monitoring of operation information in the power grid, wherein the operation information includes current and voltage in the power grid structure; S22, obtaining corresponding operation information corresponding to the power grid information, and marking the operation information corresponding to the power grid information in the power grid model; S23, storing the operation information in the power grid model according to the timestamp to obtain a power grid operation model, and monitoring the power grid state in real time through the power grid operation model; As described in the above steps S21-S23, a plurality of hardware devices for monitoring current and voltage are set in the power grid. When a fault occurs in the power grid, the current near the fault point will suddenly change. By setting a current mutation amount element, this mutation can be detected to determine whether the power grid has a fault. This element is usually used to detect faults such as short circuits; when a fault occurs in the power grid, the bus voltage near the fault point may drop. By detecting whether the bus voltage is lower than the set value, it can be determined whether the power grid has a fault. Low voltage protection is usually used to detect faults such as bus voltage loss. Therefore, it is necessary to collect voltage and current to determine whether there is a fault in the power grid. After that, the collected operation information is marked with information corresponding to the power grid structure. Since the collected operation information is processed according to time, it is necessary to store the operation information in the power grid model according to the timestamp, and then obtain the power grid operation model. The power grid operation model can realize the monitoring of the power grid operation data, and can better link the small power supply to perform joint cutting operation according to the power grid fault.

[0027] In one embodiment, the step S3 of performing fault analysis on the power grid operation model to obtain fault information and transmitting the fault information to the corresponding small power source includes: S31, formulating a power grid fault library, combining the power grid operation model with the power grid fault library to obtain fault information, wherein the fault information includes the fault type and the fault location; S32, determining a corresponding small power source based on the fault information and transmitting the information to the small power source; As described in the above steps S31 and S32, a power grid fault library is formulated, where the power grid fault library includes multiple power grid fault operation information intervals and corresponding fault types. The power grid operation model can obtain the power grid operation information in real time. Therefore, the power grid operation model is combined with the power grid fault library to obtain the fault information existing in the power grid operation model. The fault information includes the fault type and the fault location. Then, the fault location in the power grid operation model can be obtained according to the fault information, so the small power supply that controls the fault location can be obtained. After that, the fault information can be transmitted to the small power supply, so that the power grid and the small power supply can be connected and disconnected through the small power supply disconnection point, so as to better respond to the power grid fault quickly. In one embodiment, the step S31 of formulating a power grid fault library and combining the power grid operation model with the power grid fault library to obtain fault information includes: S311, formulating multiple operation information intervals of power grid faults and corresponding fault types as a power grid fault library, wherein the operation information interval of the power grid fault includes a simulation interval, multiple nodes in the simulation interval, and fault types for multiple nodes in the simulation interval, a single operation information interval of a power grid fault corresponds to a single fault type for multiple nodes in the simulation interval, and multiple nodes are simulated to be electrically connected to each other; S312, duplicating the power grid operation model according to the number of operation information intervals of the power grid fault, and putting the duplicated multiple power grid operation models into the simulation interval; S313, taking the nodes covered by the power grid operation model in the simulation interval as simulation nodes, and performing simulation interconnection on the simulation nodes according to the power grid structure; S314, performing scenario simulations on multiple nodes respectively based on the fault types of multiple nodes in the simulation interval to obtain simulated operation information; S315, taking the fault type and fault location corresponding to the operation information in the power grid operation model corresponding to the simulated operation information as fault information; As described in the above steps S311-S315, multiple operation information intervals of power grid faults and corresponding fault types are formulated as a power grid fault library. The power grid fault library here is a database used to simulate fault types for power grid operation models. The specific operations are: the operation information interval of the power grid fault includes a simulation interval, multiple nodes in the simulation interval, and fault types for multiple nodes in the simulation interval. The operation information interval of a single power grid fault corresponds to a single fault type for multiple nodes in the simulation interval. Multiple nodes are simulated electrically connected to each other. Here, multiple nodes have a simulated electrically connected relationship with each other. The nodes can be connected, and there is a feature of a data relationship of an electrical connection, for example For example, the connection between two nodes can ensure the consistency of current. Here, in order to reflect the characteristics of an electrical connection, there is not an electrical connection, but multiple operation information intervals of power grid faults. Each operation information interval of a power grid fault corresponds to the simulation of a fault type. The power grid operation model is copied according to the number of operation information intervals of the power grid fault to obtain multiple power grid operation models. The copied multiple power grid operation models are put into the simulation interval, and then the nodes covered by the power grid operation model in the simulation interval are used as simulation nodes. The nodes covered by the power grid operation model in the simulation interval are the wires in the power grid operation model and the electricity covered by the hardware. For example, one hardware corresponds to covering one node, even if multiple nodes are covered. point, and randomly select a node representing the hardware. The connection and crossing positions between the wires and other positions are all represented by corresponding nodes. In this way, a simulated node connection relationship of the corresponding power grid operation model can be obtained through the covered nodes. Nodes other than the simulated nodes do not participate in the connection relationship of the simulated nodes. Then, the simulated nodes are simulated and connected according to the power grid structure. Based on the fault types of multiple nodes in the simulation interval, scenario simulations are performed on multiple nodes respectively to obtain simulated operation information. For example, if the fault type is disconnected, each simulated node is disconnected here. For example, there are five nodes, four nodes are normal, and one node is disconnected; or three nodes are normal, two nodes are disconnected, and Corresponding to the disconnection of different nodes, multiple fault types are simulated, which is a scenario simulation here, and then the operation information corresponding to the scenario simulation is obtained. Then, the fault type and fault location corresponding to the operation information in the power grid operation model that corresponds to the simulated operation information are used as fault information. For example, in the scenario simulation with disconnection in the fault type, there is simulated operation information corresponding to the operation information in the collected power grid operation model. Then the fault type and fault location corresponding to the corresponding simulated operation information are used as fault information. The fault location is obtained by the position of the disconnected simulation node and the corresponding position in the power grid operation model. This enables rapid and comprehensive fault analysis and judgment.

[0028] In one embodiment, the step S311 of simulating electrical connection between the multiple nodes includes: S3111, setting a simulation board in the simulation interval, and setting a plurality of nodes in the simulation board; S3112, connecting the multiple nodes in pairs to obtain multiple node groups, and respectively formulating corresponding connection rules in the multiple node groups, wherein the connection rules include connection types and corresponding connection features; As described in the above steps S3111-S3112, the simulation interval serves as a spatial cloud server for running simulation. A simulation board is set in the simulation interval to carry the nodes. Multiple nodes are set in the simulation board. It is possible that any two nodes are connected. Therefore, multiple nodes are connected in pairs to obtain multiple node groups. Corresponding connection rules are formulated for the multiple node groups. The connection rules include connection types and corresponding connection characteristics. The connection types here are the types of connections in the power grid, such as series and parallel electrical connections. The corresponding connection characteristics are the characteristics of the voltage and current of the series connection at the node, and the characteristics of the voltage and current of the parallel connection at the node.

[0029] In one embodiment, the step S32 of determining the corresponding small power source based on the fault information and transmitting it to the small power source includes: S321, determining a corresponding small power source based on the fault information; S322, transmitting fault information to a small power source based on a power grid operation model; As described in the above steps S321-S322, the fault location in the power grid operation model is obtained based on the fault information, and the small power source that controls the power source at the location is obtained according to the fault location. Then, the fault information is transmitted to the small power source through the power grid operation model, which has a good joint switching corresponding effect. In the process of transmitting to the small power source, it is necessary to select the transmission path to send and receive data using their own clocks, namely the sending clock and the receiving clock. The receiving clock of FOX-41S is fixedly extracted from the receiving code stream to ensure that no bit errors and slipping codes are generated during the receiving process. There are two ways to send the clock: 1. Use the internal crystal oscillator clock; 2. Use the receiving clock as the sending clock. Using the internal crystal oscillator clock as the sending clock is often called the internal clock (master clock) mode, and using the receiving clock as the sending clock is often called the external clock (slave clock) mode. There are three ways for the operation of the devices on both sides: both devices on both sides use the slave clock mode; both devices on both sides use the internal clock mode; one device uses the internal clock and the other device uses the slave clock (this method will make the setting value more complicated, so it is not recommended). FOX-41S determines the communication clock mode by setting the control word "communication internal clock". When the control word "communication internal clock" is set to 1, the device automatically uses the internal clock mode; otherwise, it automatically uses the external clock mode. The "communication internal clock" control word of each optical fiber channel is set separately and does not affect each other.For a communication rate of 64 kbit / s, the "communication internal clock" control word is set as follows: when FOX-41S communicates through a dedicated fiber core, the "communication internal clock" control word of FOX-41S on both sides is set to: '1'; when FOX-41S communicates through PCM multiplexing, the "communication internal clock" control word of FOX-41S on both sides is set to: '0'; for a communication rate of 2048 kbit / s, the "communication internal clock" control word is set as follows: when FOX-41S communicates through a dedicated fiber core, the "communication internal clock" control word of FOX-41S on both sides is set to: '1'; when FOX-41S transmits through a multiplexing channel, the "communication internal clock" control word of FOX-41S on both sides is set according to the following principle: When the command information is directly connected to the 2048 kbit / s SDH equipment through a coaxial cable it / s board, and when the "retiming" function of the 2048kbit / s channel in the SDH equipment is turned off, the "communication internal clock" control word of the FOX-41S on both sides is set to 1 (this method is recommended); when the command information is directly connected to the 2048kbit / s board of the SDH equipment through the coaxial cable, and the "retiming" function of the 2048kbit / s channel in the SDH equipment is turned on, the "communication internal clock" control word of the FOX-41S on both sides is set to 0; when the command information is connected to the 2048kbit / s board of the SDH equipment through channel switching and other devices, the "communication internal clock" control word of the FOX-41S on both sides is set, the data is transmitted in one direction, that is, one side of the FOX device on both sides only sends data and does not receive, and the other side device only receives the opposite side data and does not send to the opposite side, so fault information can be sent.

[0030] In one embodiment, the step S4 of disconnecting the small power source from the power grid by disconnecting the small power source from the grid includes: S41, after the small power source receives the fault information, the operation information of the corresponding power grid is confirmed; S42, prompting the small power disconnection point through the confirmed fault information, and disconnecting the small power from the power grid through the small power disconnection point; As described in the above steps S41-S43, after the small power source receives the fault information, the operation information of the corresponding power grid is confirmed. Here, the confirmation is performed through the voltage and current corresponding to the fault information collected at the small power source disconnection point. The small power source disconnection point is a small power source disconnection device. The small power source disconnection device is used to quickly cut off the grid connection point switch when a fault or safety hazard occurs in the power system, so as to disconnect the faulty part from the power grid, so as to prevent the accident from expanding and ensure the stable operation of the power grid.

[0031] Example 2, please refer to Figure 2 As shown, the small power source automatic switching device in case of power grid failure described in this embodiment includes: An acquisition module is used to acquire power grid information, wherein the power grid information includes power grid structure and hardware information in the power grid, and to construct a power grid model based on the power grid information; The monitoring module is connected to the acquisition module and is used to monitor the operation information in the power grid in real time, and provide the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid status in real time.

[0032] The analysis module is connected to the monitoring module and is used to perform fault analysis on the power grid operation model to obtain fault information and transmit the fault information to the corresponding small power source.

[0033] The disconnection module is connected to the analysis module and is used to disconnect the small power source from the power grid through the small power source disconnection point.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for automatically switching small power sources when a power grid fails, characterized in that: The following steps are involved: Acquire power grid information, wherein the power grid information includes power grid structure and hardware information in the power grid, and construct a power grid model based on the power grid information; Monitor the operation information in the power grid in real time, and provide the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid status in real time; Perform fault analysis on the power grid operation model to obtain fault information, and transmit the fault information to the corresponding small power source; The small power source is disconnected from the grid through the small power source disconnection point.

2. The method for automatically switching off a small power source when a power grid fails according to claim 1, characterized in that: The step of constructing a power grid model based on power grid information includes: Acquire the grid structure and hardware information in the grid as grid information; Construct a physical model as nodes based on the hardware information in the power grid, and connect the nodes according to the power grid structure to obtain a topological structure diagram; The corresponding cloud server is configured according to the topology diagram as the power grid model.

3. The method for automatically switching off a small power source when a power grid fails according to claim 1 is characterized in that: The step of monitoring the operation information in the power grid in real time and providing the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid state in real time includes: Real-time monitoring of the operation information in the power grid, where the operation information includes the current and voltage in the power grid structure; Obtain corresponding operation information corresponding to the power grid information, and mark the operation information corresponding to the power grid information in the power grid model; The operation information is stored in the power grid model according to the timestamp to obtain the power grid operation model, and the power grid status is monitored in real time through the power grid operation model.

4. The method for automatically switching off a small power source when a power grid fails according to claim 1 is characterized in that: The step of performing fault analysis on the power grid operation model to obtain fault information and transmitting the fault information to the corresponding small power source includes: Formulate a power grid fault library, combine the power grid operation model with the power grid fault library to obtain fault information, wherein the fault information includes the fault type and the fault location; A corresponding small power source is determined based on the fault information and transmitted to the small power source.

5. The method for automatically switching off a small power source when a power grid fails according to claim 4, characterized in that: The step of formulating a power grid fault library and combining the power grid operation model with the power grid fault library to obtain fault information includes: Formulate multiple power grid fault operation information intervals and corresponding fault types as a power grid fault library, wherein the power grid fault operation information interval includes a simulation interval, multiple nodes in the simulation interval, and fault types for multiple nodes in the simulation interval, a single power grid fault operation information interval corresponds to a single fault type for multiple nodes in the simulation interval, and multiple nodes are simulated to be electrically connected to each other; The power grid operation model is copied according to the number of operation information intervals of the power grid fault, and the copied multiple power grid operation models are put into the simulation interval; The nodes covered by the power grid operation model in the simulation interval are taken as simulation nodes, and the simulation nodes are simulated and connected according to the power grid structure; Based on the fault types of multiple nodes in the simulation interval, scenario simulations are performed on multiple nodes respectively to obtain simulated operation information; The fault type and fault location corresponding to the operation information in the power grid operation model corresponding to the simulated operation information are used as fault information.

6. The method for automatically switching off a small power source when a power grid fails according to claim 5, characterized in that: The step of simulating electrical connection between the multiple nodes comprises: A simulation board is set in the simulation interval, and multiple nodes are set in the simulation board; Multiple nodes are connected in pairs to obtain multiple node groups, and corresponding connection rules are formulated in the multiple node groups, wherein the connection rules include connection types and corresponding connection features.

7. The method for automatically switching off a small power source when a power grid fails according to claim 4, characterized in that: The step of determining the corresponding small power source based on the fault information and transmitting the fault information to the small power source comprises: Determine the corresponding small power supply based on the fault information; Transmit fault information to small power sources based on the grid operation model.

8. The method for automatically switching off a small power source when a power grid fails according to claim 1, characterized in that: The step of disconnecting the small power source from the power grid through the small power source disconnection point includes: After the small power source receives the fault information, it confirms the operation information of the corresponding power grid; The confirmed fault information prompts the small power disconnection point, and the small power is disconnected from the power grid through the small power disconnection point.

9. A device for automatically switching off a small power source when a power grid fails, used to implement a method for automatically switching off a small power source when a power grid fails as claimed in any one of claims 1 to 8, characterized in that: include: An acquisition module is used to acquire power grid information, wherein the power grid information includes power grid structure and hardware information in the power grid, and to construct a power grid model based on the power grid information; The monitoring module is connected to the acquisition module and is used to monitor the operation information in the power grid in real time, and provide the operation information to the power grid model in real time to obtain the power grid operation model to monitor the power grid status in real time. The analysis module is connected to the monitoring module and is used to perform fault analysis on the power grid operation model to obtain fault information and transmit the fault information to the corresponding small power source. The disconnection module is connected to the analysis module and is used to disconnect the small power source from the power grid through the small power source disconnection point.

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