Method and system for handling multiple cascade faults of power grid

Abstract

The invention discloses a processing method and system for power grid multi-cascade faults, and relates to the field of power system fault processing, and the processing method for the power grid multi-cascade faults comprises the steps: constructing a multi-cascade fault rapid judgment knowledge graph; fault event information is obtained through the comprehensive intelligent alarm information, and the real-time operation state of the power grid is monitored; identifying a fault type, and obtaining equipment associated information; querying the fault plan knowledge graph, matching the fault disposal process plan, and establishing a fault disposal group for outputting fault disposal process operation prompts and information intercommunication; judging whether an out-of-limit risk exists or not; an adjustment strategy is adopted for existing out-of-limit risks until all out-of-limit risks are eliminated; and analyzing actual conditions to carry out equipment power restoration and state recovery operation. According to the method, the problems that fault handling mainly depends on artificial experience and the intelligent level is low are solved, meanwhile, the power grid multi-cascade fault handling efficiency is improved, and the workload of regulation and control personnel is relieved.

Description

Technical Field

[0001] The present invention relates to the field of power system fault handling, and in particular to a method and system for handling multiple cascading faults in a power grid. Background Art

[0002] With the formation of large AC / DC hybrid power grids in my country, the grid structure is becoming increasingly complex, and the operation mode is flexible and changeable, which leads to increasingly complex control business. If the grid fault is not handled in time, it will cause a chain reaction of faults between AC and DC systems, posing a serious threat to the safety and stability of the grid. The dispatching pressure to deal with large-scale power outages, severe disaster weather, and public emergencies is huge.

[0003] Power systems are bound to experience failures due to natural factors, improper operation, circuit breakers / short circuit faults, incorrect operation of relay protection and circuit breakers, or external interference. If the fault is not diagnosed in time and relevant measures are not taken to restore power supply, the fault may cause a major accident in the power system or even a large-scale power outage, resulting in huge economic losses and unpredictable social impacts.

[0004] In the actual operation of the power grid system, when a power grid failure occurs, the system will provide the controller with a large number of relevant substation alarm signals and accident maps within the control range, making it difficult for the controller to deal with the power grid failure in real time and accurately, thereby achieving precise control. Therefore, how to extract effective fault information from the system and realize the fusion application of multiple information to solve the problem of real-time and accurate diagnosis and handling of power grid failures is of great theoretical and practical significance.

[0005] The prior art document (CN115549293A) discloses a system for multi-person online collaborative handling of network-level provincial power grid faults, including a fault information perception module, a fault handling process module, a fault risk analysis module, a risk elimination decision module, a power transmission auxiliary decision module, a network-level collaborative module, and a fault handling electronic trace module. The fault risk analysis module also includes N-1 indicator analysis related functions, and also proposes a method for multi-person online collaborative handling of network-level provincial power grid faults. This existing document mainly proposes a method for determining multiple cascading faults. For multiple related faults, they are combined into a multiple cascading fault for handling, which can avoid invalid repetitive work and greatly reduce the workload of dispatchers; at the same time, the impact of these faults on the operation of the power grid itself is also related. Combining them into a multiple cascading fault for handling is more in line with the actual situation of power grid fault handling and ensures the safety and stability of power grid operation.

[0006] The deficiency of the prior art is that it is unable to analyze the essential causes of multiple faults, including whether there is over-tripping caused by switch refusal to operate, poor switch operation characteristics, current transformer failure, etc. The present invention constructs a knowledge graph for judging multiple cascading faults in the power grid based on knowledge graph technology, which improves the deficiencies of the prior art, helps to improve the power grid's accident handling capabilities, prevents the continued expansion of the area of ​​potential power safety hazards, and prevents large-scale power outages. Summary of the invention

[0007] In order to solve the deficiencies in the prior art, the present invention provides a method and system for handling multiple cascading faults in power grids, which constructs a judgment of multiple cascading faults in power grids through a knowledge graph, thereby improving the efficiency of power grid fault handling and reducing the workload of control personnel.

[0008] The present invention adopts the following technical solution. A first aspect of the present invention provides a method for handling multiple cascading faults in a power grid, comprising the following steps:

[0009] Construct a knowledge graph for rapid judgment of multiple cascading failures;

[0010] Obtain power grid fault event information through comprehensive intelligent alarm information and monitor the real-time operation status of the power grid; analyze multiple cascading faults in the power grid by combining fault event information with the knowledge graph for rapid judgment of multiple cascading faults, identify fault types, and obtain equipment-related information;

[0011] According to the fault event information and equipment-related information, the fault plan knowledge graph is queried to match the fault handling process plan, and a fault handling group is established to output fault handling process operation prompts and information exchange; based on the power grid after fault handling, the real-time operation status of the power grid and the fault event information are used to determine whether there are risks of main transformers, line over-limit, main transformer and busbar power outages, and section over-limit situations;

[0012] Based on the results of the risk assessment, the unit output adjustment strategy is prioritized for the existing risk of over-limit; when the unit adjustment strategy cannot eliminate the risk of over-limit, the load adjustment strategy is adopted until all the risk of over-limit is eliminated;

[0013] Based on the power grid after eliminating the risk of over-limit, analyze the actual situation and perform equipment power restoration and status recovery operations. The above technical solution also includes the following steps: generating and storing a power grid fault report based on the power grid fault event, fault handling process, and corresponding adjustment strategies and operations.

[0014] Building a knowledge graph for rapid judgment of multiple cascading failures includes the following steps:

[0015] Build a basic knowledge graph to collect and organize power regulation data;

[0016] Build a business process management knowledge graph to collect and organize typical application scenarios;

[0017] Build the relationship between the basic knowledge graph and the business process management knowledge graph, integrate the characteristics of the control data and scenarios, and obtain a knowledge graph for rapid judgment of multiple cascading failures.

[0018] According to the fault event information and equipment association information, the fault plan knowledge graph is queried to match the fault handling process plan, and a fault handling group is established for outputting fault handling process operation prompts and information exchange, including the following steps:

[0019] Based on the equipment association information, the matching fault handling plan is obtained by querying the fault plan knowledge graph;

[0020] Based on the fault handling plan, combined with data and experience, establish operational prompts for the fault handling process;

[0021] According to the fault event information, determine the fault and the operation and maintenance unit to which it belongs, obtain the personnel information of the operation and maintenance unit, and establish a communication platform as a fault handling group;

[0022] Based on the established operation prompts and fault handling groups, the operation prompts of the fault handling process are updated in real time through the fault handling group, and information is exchanged. The operation prompts of the fault handling process are used to characterize the handling operations and their sequence for eliminating the fault; each handling operation of the fault handling process is set with a status display; when it is determined that the operator has not performed a certain handling operation, the status corresponding to the handling operation is displayed as pending; when the operator completes a certain handling operation, the status corresponding to the certain handling operation is changed to completed.

[0023] Determining whether there is a risk of over-limit includes: determining whether there is a risk of main transformer, line over-limit, main transformer and busbar power failure, and section over-limit; determining whether there is a risk of main transformer, line over-limit includes:

[0024] Real-time comparison of the active power and rated capacity data of the main transformer of the power grid. If the real-time value of the active power of the main transformer exceeds the rated capacity of the main transformer, it means that there is a risk of the main transformer exceeding the limit; otherwise, there is no risk of the main transformer exceeding the limit;

[0025] Compare the line current and current upper limit data of the power grid in real time. If the real-time value of the line phase current exceeds the line current upper limit, it means that there is a risk of line over-limit; otherwise, there is no risk of line over-limit;

[0026] Judging whether there is a risk of main transformer and busbar power failure includes:

[0027] Monitor the real-time main transformer current of the power grid. If the currents on all sides of the main transformer are zero, it means that there is a risk of power failure in the main transformer; otherwise, there is no risk of power failure in the main transformer.

[0028] Monitor the real-time bus voltage of the power grid. If the three-phase voltages of the bus are all zero, it means that there is a risk of power loss on the bus; otherwise, there is no risk of power loss on the bus.

[0029] Judging whether there is a risk of cross-section exceeding the limit includes:

[0030] Comparing the real-time section active power and steady-state limit data of the power grid, if the real-time value of the section active power flow exceeds the section steady-state limit value, it means that there is a risk of section exceeding the limit; otherwise, there is no risk of section exceeding the limit.

[0031] The unit output adjustment strategy includes: based on the sensitivity analysis method, respectively obtaining the sensitivity values ​​of the over-limit section and branch to the unit; sorting the positive and negative sensitivity values ​​corresponding to the over-limit section and branch in descending order according to the absolute value of the sensitivity, respectively obtaining the sensitivity information of the top-ranked units corresponding to the over-limit section and branch; respectively calculating the sensitivity information of the top-ranked units to obtain the section active power reduction and the branch active power reduction; if the section active power reduction exceeds the section remaining over-limit amount, and the branch active power reduction exceeds the branch remaining over-limit amount, then the output adjustment of the unit is terminated; otherwise, the output adjustment of the adjustable units is continued; the standard for the output adjustment to fail to eliminate the risk is that after all adjustable units have participated, the section remaining over-limit amount and the branch remaining over-limit amount cannot be eliminated.

[0032] The load adjustment strategy includes: using a sensitivity analysis method to obtain the positive sensitivity values ​​of the section and branch to any load, respectively, sorting the positive sensitivity values ​​of the section and branch to the load in descending order according to the sensitivity, and obtaining the load sensitivity information corresponding to the section and branch with the top ranking; calculating the above-mentioned top positive sensitivity values ​​to obtain the section active power flow reduction and the branch active power flow reduction respectively; if the section active power flow reduction exceeds the section residual over-limit, and the branch active power flow reduction exceeds the branch residual over-limit, the load adjustment strategy is terminated; otherwise, the load continues to be subject to accident power rationing until the section residual over-limit and the branch residual over-limit are eliminated or all positive sensitivities have been selected.

[0033] Analyze the actual situation including: based on the power grid after eliminating the risk of over-limit, analyze whether the protection is operating normally, whether the line is listed, whether there is a maintenance application form for the line, whether the line is an overhead line, whether the weather is not typhoon weather, and whether the current on each side of the transformer of the fault-connected substation is within the limit;

[0034] The equipment power restoration and status recovery operations include: checking the equipment power transmission, orderly power consumption, busbar connection adjustment, conventional load transfer, and status recovery;

[0035] If the busbar connection is adjusted, the conventional load is transferred, and the equipment loses power, determine whether the fault meets the conditions for forced power transmission. If it meets the conditions for forced power transmission, perform forced power transmission; if it does not meet the conditions for forced power transmission, determine whether to ignore the judgment result of the conditions for forced power transmission and directly perform forced power transmission; if the external instruction chooses to ignore, perform forced power transmission directly; if the external instruction chooses not to ignore, perform equipment decommissioning; determining whether the conditions for forced power transmission are met include: determining whether the protection is operating normally, and the fault is not listed, and there is no maintenance application form for the fault, and the fault is an overhead line, and the weather is not typhoon weather, and the current on each side of the transformer of the substation connected to the fault is within the limit.

[0036] The second aspect of the present invention provides a system for handling multiple cascading faults in a power grid, comprising a knowledge graph construction module, a fault information perception module, a multiple cascading fault module, a fault handling process module, a risk perception module, a risk handling module, a fault handling closing module and a fault reporting module.

[0037] Knowledge graph construction module, used to construct a knowledge graph for rapid judgment of multiple cascading faults in power grids;

[0038] Fault information perception module, used to obtain fault event information of the power grid through comprehensive intelligent alarm information, and collect real-time operation status of the power grid;

[0039] The multiple cascading fault module is connected with the fault information perception module and the knowledge graph construction module. Based on the fault event information obtained by the fault information perception module and the knowledge graph of multiple cascading faults of the power grid obtained by the knowledge graph construction module, the multiple cascading faults of the power grid are identified and the equipment association information is obtained.

[0040] The fault handling process module is connected with the fault information perception module and the multiple cascading fault module. It is used to query the fault plan knowledge graph based on the fault event information obtained by the fault information perception module and the equipment association information obtained by the multiple cascading fault module, match the fault handling process plan, and establish a communication channel for fault handling process operation prompts and information interaction;

[0041] The risk perception module is connected with the fault information perception module and the fault handling process module. Based on the power grid whose fault handling is completed obtained by the fault handling process module, the real-time operation status information of the power grid obtained by the fault information perception module and the fault event information, it determines whether there is an over-limit risk. If it is determined that there is no risk, it jumps to the fault handling closing module.

[0042] The risk handling module is connected to the risk perception module. Based on the judgment result of the risk perception module on the over-limit risk, if there is an over-limit risk, the unit output adjustment strategy is adopted first; when the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all over-limit risks are eliminated;

[0043] The fault handling and finishing module is connected with the risk perception module and the risk handling module, and performs equipment power restoration and status recovery operations based on the power grid after eliminating the over-limit risk obtained by the risk perception module and the risk handling module;

[0044] The fault reporting module is connected with the fault information perception module, the multiple cascade fault module, the fault handling process module, the risk perception module, the risk handling module, and the fault handling closing module, and is used to generate and store power grid fault reports based on fault event processing information.

[0045] A third aspect of the present invention provides a terminal, including a processor and a storage medium;

[0046] The storage medium is used to store instructions;

[0047] The processor is configured to operate according to the instructions to perform any step of the method.

[0048] The fourth aspect of the present invention provides a computer-readable storage medium, on which is stored a program for a method for handling multiple cascading failures in a power grid. When the program is executed by a processor, it implements any step of a method for handling multiple cascading failures in a power grid described in the above technical solution.

[0049] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention realizes the rapid collection of effective information and fault location by collecting and integrating information related to fault events in the integrated intelligent alarm system and the SCADA system. The judgment of multiple cascading faults is realized by establishing a knowledge graph of multiple cascading faults; the real-time operation risk analysis caused by power grid faults is completed by using network analysis technologies such as topological search, and the power grid risk is analyzed by eventing and objectifying information related to power grid faults, and the control personnel are assisted in executing the phased power grid fault handling in an automatic process-based guidance manner, realizing the full process monitoring of the handling process, ensuring the efficiency and standardization of the handling process, effectively improving the efficiency of power grid fault handling, reducing the workload of control personnel, and improving the work level of dispatching safety production. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the process of the present invention;

[0051] Figure 2 It is a schematic diagram of a module of the present invention;

[0052] Figure 3 This is a knowledge graph relationship diagram for rapid judgment of multiple cascading faults of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0054] like Figure 1 As shown, embodiment 1 of the present invention provides a method for handling multiple cascading faults in a power grid, comprising the following steps:

[0055] Step 1: Construct a knowledge graph for rapid judgment of multiple cascading failures;

[0056] Preferably, step 1 specifically includes the following steps:

[0057] A method for constructing a knowledge graph for rapid judgment of multiple cascading faults includes the following steps:

[0058] Step 1.1: Build a basic knowledge graph to collect and organize power regulation data.

[0059] The basic knowledge graph is the basic knowledge graph of electric power, including the electric power dispatching knowledge base entity. The subordinate entities of the electric power dispatching knowledge base include: control experience, dispatching procedures and dispatching details;

[0060] The subordinate entities of the control experience include: protection configuration status and protection action logic;

[0061] Subordinate entities of the dispatching regulations include: dispatching operation management experience and power grid fault handling experience;

[0062] Subordinate entities of the dispatching rules include: regional operation mode of the power grid and the scope of power grid dispatching.

[0063] Step 1.2: Build a business process management knowledge graph and collect and organize typical application scenarios.

[0064] Construct a business process management knowledge graph including typical scenario entities.

[0065] Step 1.3: Construct the relationship between the basic knowledge graph obtained in step 1.1 and the business process management knowledge graph in step 1.2, integrate the characteristics of the control data and the scenario, and obtain the knowledge graph for rapid judgment of multiple cascading failures

[0066] in,

[0067] A typical scenario is a subordinate entity of the power dispatch knowledge base;

[0068] Typical scenario entities can query the control experience and return the protection configuration and protection action logic;

[0069] Typical scenario entities can query the dispatching procedures and return the dispatching operation management procedures and power grid fault handling procedures;

[0070] Typical scenario entities can be queried from the dispatch details and return the grid regional operation mode and grid dispatch scope.

[0071] Preferably, in Example 1, the application scenarios of regulation are analyzed through the business process management knowledge graph, the regulation data are analyzed through the power basic knowledge graph, the characteristics of data and scenarios are integrated, all application scenarios of regulation are classified based on the scenario stratification mechanism, the regulation data used in each scenario is determined, and the regulation data associated with the application scenario is determined through statistical analysis, thereby forming a power regulation knowledge graph based on the scenario classification.

[0072] Based on the knowledge graph of power control, the above fault characteristics such as equipment tripping, protection action, switch displacement, fault phase, reclosing action, etc. are organically integrated to form complete fault analysis information and reveal the root cause of power grid faults. The identified entities and entity relationships are stored in the form of triples to obtain a knowledge graph for rapid judgment of multiple cascading faults in the power grid, such as Figure 3 shown.

[0073] The power regulation knowledge graph includes the knowledge graph for rapid judgment of multiple cascading failures in power grids.

[0074] It is worth noting that, as one of the outstanding essential features of the present invention, the identification of multiple cascading faults is established based on the knowledge graph.

[0075] The knowledge graph is developed on the basis of the knowledge base. It is essentially a semantic network. The basic unit is the "entity-relationship-entity" or "entity-entity-relationship" triple structure. It aims to describe the concepts, entities, events and the complex relationships between them in the objective world in a structured form. Entities and attributes are represented by nodes, and relationships are represented by directed edges. They are stored in a graph database and have a fast logical reasoning speed. The knowledge graph can be constructed through the steps of knowledge collection, knowledge processing, knowledge extraction, knowledge representation, and knowledge storage. Among them, knowledge extraction is the core step, and the extraction method of entities and relationships is a hot topic in academic research.

[0076] The knowledge graph has strong logical reasoning ability and currently demonstrates its powerful power in the fields of intelligent search, dialogue question and answer, and has become the core driving force for the development of artificial intelligence. In view of the efficient reasoning ability of the knowledge graph, the present invention can integrate the control procedures, experience, and details into knowledge, and form a knowledge graph for rapid judgment of multiple cascading faults in the power grid in combination with typical scenarios. By automatically sensing the fault comprehensive intelligent alarm signal issued by the comprehensive intelligent alarm, matching the knowledge graph for rapid judgment of multiple cascading faults in the power grid, and combining the actual operation of the power grid, the disposal strategy is automatically generated, and the line fault disposal is completed in a guided manner under human-computer interaction.

[0077] Step 2: Obtain the fault event information of the power grid through comprehensive intelligent alarm information and monitor the real-time operation status of the power grid;

[0078] Among them, the comprehensive intelligent alarm information described in step 2 specifically includes: fault name, voltage level, fault time, fault phase, head-end plant station, and terminal plant station.

[0079] Fault event information includes three-span information of the fault, line type information, maintenance information, meteorological information, and fault recording information. Three-span information includes fault, name of the object being crossed, type of the object being crossed, span of the crossing line, and tower number of the crossing line; line type information includes line category and line length; maintenance information includes application form number, decommissioning approval start time, decommissioning approval end time, work content, safety measures, and physical equipment name; meteorological information includes weather text forecast, wind direction, wind speed, temperature, and level.

[0080] Step 3: Based on the fault event information obtained in step 2, the knowledge graph of multiple cascading faults in the power grid obtained in step 1 is analyzed to identify the fault type, query the dispatching experience, rules and regulations, and obtain the equipment-related information;

[0081] In a further preferred but non-limiting embodiment of the present invention, step 3 specifically includes: performing a multiple cascade fault analysis of the power grid through information such as protection action signals and switch position change signals within a time span in the fault event information, identifying the type of the current fault, returning the cause of the fault and the faulty device, and obtaining device-related information through the faulty device;

[0082] Step 4: Based on the fault event information obtained in step 2 and the equipment association information obtained in step 3, query the fault plan knowledge graph, match the fault handling process plan, and establish a communication group for outputting fault handling process operation prompts and information exchange;

[0083] Step 4.1: Based on the equipment association information obtained in step 3, obtain a matching fault handling plan by querying the fault plan knowledge graph;

[0084] Step 4.2: Based on the fault handling plan obtained in step 4.1, establish the operation prompts of the fault handling process in combination with the dispatching experience, rules and regulations;

[0085] Step 4.3: According to the fault event information obtained in step 2, determine the fault and the operation and maintenance unit to which it belongs, obtain the personnel information of the operation and maintenance unit, and establish a communication platform as a fault handling group;

[0086] Step 4.4: Based on the operation prompts established in step 4.2 and the fault handling communication group established in step 4.3, the operation prompts of the fault handling process are updated in real time through the fault handling group, and information exchange is carried out.

[0087] Preferably, the fault and the operation and maintenance unit to which it belongs are determined based on the fault event information, the personnel information of the operation and maintenance unit is obtained, and a communication platform is established as a fault handling group.

[0088] According to the fault event information, the accident plan, fault handling experience and dispatching procedures are matched to establish a fault handling process and a fault handling group for outputting fault handling process operation prompts and information exchange; the fault event handling process is a handling process generated after analyzing the accident plan, fault handling experience, accident handling manual and dispatching procedures. At the same time, each process has two states: pending and completed, which is convenient for the control personnel to direct the fault handling, and at the same time establish a group of fault-related operation and maintenance and repair units.

[0089] Specifically, when a certain power grid equipment fails and returns comprehensive intelligent alarm information, the multi-level collaborative module locates the equipment and returns the attribute information of the equipment. The fault handling process module determines the fault and the operation and maintenance unit to which it belongs based on the fault event information, obtains the personnel information of the operation and maintenance unit and establishes a communication platform. The system internal communication software or other instant messaging software can be used as a fault handling group. By querying the fault plan knowledge graph, a matching fault handling plan is obtained; the fault handling plan is combined with the dispatching procedures, accident handling manuals, and fault handling experience to establish a fault handling process to guide the dispatcher to handle the fault. The knowledge graph of the fault handling process is used to characterize the handling operations and their sequence for achieving fault elimination; each handling operation of the fault handling process is set with a status display; when it is determined that the operator has not performed a certain handling operation, the status corresponding to the handling operation is displayed as pending; when the operator completes a certain handling operation, the status corresponding to the certain handling operation is changed to completed.

[0090] Step 5: Based on the power grid after fault handling obtained in step 4, and the real-time operation status and fault event information obtained in step 2, determine whether there is a risk of over-limit;

[0091] In the above technical solution, the above-mentioned risk judgment of over-limit specifically includes:

[0092] The risk judgment process of whether there is a main transformer or line over-limit includes:

[0093] Real-time comparison of the active power and rated capacity data of the main transformer of the power grid. If the real-time value of the active power of the main transformer exceeds the rated capacity of the main transformer, it means that there is a risk of the main transformer exceeding the limit; otherwise, there is no risk of the main transformer exceeding the limit;

[0094] Compare the line current and current upper limit data of the power grid in real time. If the real-time value of the line phase current exceeds the line current upper limit, it means that there is a risk of line over-limit; otherwise, there is no risk of line over-limit;

[0095] The risk determination process of whether there is a main transformer and busbar power failure includes:

[0096] Monitor the real-time main transformer current of the power grid. If the currents on all sides of the main transformer are zero, it means that there is a risk of power failure in the main transformer; otherwise, there is no risk of power failure in the main transformer.

[0097] Monitor the real-time bus voltage of the power grid. If the three-phase voltages of the bus are all zero, it means that there is a risk of power loss on the bus; otherwise, there is no risk of power loss on the bus.

[0098] The process of judging whether there is a cross-section risk includes:

[0099] Comparing the real-time section active power and steady-state limit data of the power grid, if the real-time value of the section active power flow exceeds the section steady-state limit value, it means that there is a risk of section exceeding the limit; otherwise, there is no risk of section exceeding the limit.

[0100] Step 6: Based on the over-limit risk judgment result obtained in step 4, the unit output adjustment strategy is preferentially adopted for the over-limit risk; when the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all over-limit risks are eliminated;

[0101] After determining that there is an over-limit risk, the unit output adjustment strategy is adopted first. When the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all risks are eliminated. The information of the unit output adjustment strategy includes the unit name, the plant to which it belongs, sensitivity, adjustment amount, value before adjustment, value after adjustment, upper and lower limits, affected equipment and affected amount; the information of the load adjustment strategy includes priority, load name, plant to which it belongs, sensitivity, total power limit, and affected amount.

[0102] The unit output adjustment strategy includes: based on the sensitivity analysis method, respectively obtaining the sensitivity values ​​of the over-limit section and branch to the unit; sorting the positive and negative sensitivity values ​​corresponding to the over-limit section and branch in descending order according to the absolute value of the sensitivity, respectively obtaining the sensitivity information of the top-ranked units corresponding to the over-limit section and branch; respectively calculating the sensitivity information of the top-ranked units to obtain the section active power reduction and the branch active power reduction; if the section active power reduction exceeds the section remaining over-limit amount, and the branch active power reduction exceeds the branch remaining over-limit amount, then the output adjustment of the unit is terminated; otherwise, the output adjustment of the adjustable units is continued; the standard for the output adjustment to fail to eliminate the risk is that after all adjustable units have participated, the section remaining over-limit amount and the branch remaining over-limit amount cannot be eliminated.

[0103] The load adjustment strategy includes: using a sensitivity analysis method to obtain the positive sensitivity values ​​of the section and branch to any load, respectively, sorting the positive sensitivity values ​​of the section and branch to the load in descending order according to the sensitivity, and obtaining the load sensitivity information corresponding to the section and branch with the top ranking; calculating the above-mentioned top positive sensitivity values ​​to obtain the section active power flow reduction and the branch active power flow reduction respectively; if the section active power flow reduction exceeds the section residual over-limit, and the branch active power flow reduction exceeds the branch residual over-limit, the load adjustment strategy is terminated; otherwise, the load continues to be subject to accident power rationing until the section residual over-limit and the branch residual over-limit are eliminated or all positive sensitivities have been selected.

[0104] Step 7: Based on the results of eliminating the risk of over-limit obtained in step 6, the equipment is restored to power and status after analyzing the actual situation, including forced power supply, orderly power consumption, busbar connection adjustment, conventional load transfer, and status recovery after inspection of the equipment.

[0105] If the equipment loses power after busbar connection adjustment and conventional load transfer, the forced power supply condition is judged. If it meets the conditions, the forced power supply operation is carried out; if it does not meet the conditions, the judgment on whether to ignore the judgment result and directly force power supply is carried out; if it is ignored, the forced power supply operation is carried out; if it is not ignored, the equipment is decommissioned.

[0106] The analysis of the actual situation in step 7 refers to whether the protection is operating normally, whether the line is listed, whether there is a maintenance application form for the line, whether the line is an overhead line, whether the weather is not typhoon weather, and whether the current on each side of the transformer of the fault-connected substation is within the limit;

[0107] The protection action information includes: line name, protection device type, protection device model, protection action time, whether failure protection is activated, whether main protection action is activated, and whether backup protection is activated. When it is determined that failure protection, main protection action, and backup protection are all activated normally, the corresponding protection device is considered to be in normal action.

[0108] The line signage information includes: line name, whether live work signage is available, and whether maintenance work signage is available. When both live work signage and maintenance work signage are determined to be yes, it is considered that the corresponding line has line signage information.

[0109] The line maintenance application form information includes: application form number, physical equipment name, physical equipment ID, decommissioning approval start time, and decommissioning approval end time. Match the fault ID (ID_DEV) of the integrated intelligent alarm table with the physical equipment ID (DEV_ID) of the maintenance application form in the control cloud. If the match is successful, determine whether the current time is within the decommissioning approval start time (PASS_BEGIN_TIME) and decommissioning approval end time (PASS_END_TIME). If it is within this time, it is considered that the corresponding line has maintenance application form information, otherwise there is no maintenance application form information.

[0110] The current on each side of the transformer of the faulty connected substation does not exceed the limit (when the current value is less than the set current). The information includes: transformer name, plant name, high-voltage side current value, medium-voltage side current value, and low-voltage side current value.

[0111] Whether the protection is working normally is divided into three categories:

[0112] Category 1: Failure protection does not operate, at least one set of main protection operates, and backup protection may or may not operate, indicating normal protection operation;

[0113] Category 2: Failure protection and main protection do not operate, only backup protection operates, which is an abnormal protection operation;

[0114] Category 3: Only the failure protection action is abnormal. In the above technical scheme, the conditions for forced power transmission are: the protection action is normal, and the fault is not listed, and there is no maintenance application form for the fault, and the fault is an overhead line, and the weather is not typhoon weather, and the current on each side of the transformer of the substation connected to the fault does not exceed the limit.

[0115] Based on the fault event information, fault handling measures, over-limit risk judgment elimination and adjustment, equipment power restoration and status recovery obtained in steps 1-6, a power grid fault report is generated and stored.

[0116] The grid fault report information includes: fault name, fault time, fault location, fault equipment, fault cause, fault voltage level, fault discoverer, weather and other basic fault-related information. The generated report is stored in the historical fault handling information for post-fault pictures, statistical tables and explanatory texts to be reviewed after the fault is handled.

[0117] like Figure 2As shown, embodiment 2 of the present invention provides a system for handling multiple cascading faults in a power grid, the system comprising a knowledge graph construction module for quickly judging multiple cascading faults in a power grid, a fault information perception module, a multiple cascading fault module, a fault handling process module, a risk perception module, a risk handling module, a fault handling closing module and a fault reporting module;

[0118] The knowledge graph construction module is used to construct a knowledge graph for rapid judgment of multiple cascading faults in power grids;

[0119] The fault information sensing module is used to obtain the fault event information of the power grid through the comprehensive intelligent alarm information, and collect the real-time operation status of the power grid;

[0120] In a preferred but non-limiting embodiment of the present invention, the comprehensive intelligent alarm information includes fault name, voltage level, fault time, fault phase, head-end plant station, and terminal plant station.

[0121] Fault event information includes three-span information of the fault, line type information, maintenance information, meteorological information, and fault recording information. Three-span information includes fault, name of the object being crossed, type of the object being crossed, span of the crossing line, and tower number of the crossing line; line type information includes line category and line length; maintenance information includes application form number, decommissioning approval start time, decommissioning approval end time, work content, safety measures, and physical equipment name; meteorological information includes weather text forecast, wind direction, wind speed, temperature, and level.

[0122] The multiple cascading fault module is connected with the fault information perception module and the knowledge graph construction module, and is used to identify multiple cascading faults of the power grid through the knowledge graph of multiple cascading faults of the power grid obtained by the knowledge graph construction module based on the fault event information obtained by the fault information perception module, and obtain equipment association information;

[0123] In a preferred but non-limiting embodiment of the present invention, the multiple cascading fault identification logic is as follows:

[0124] Multiple cascading fault identification is established based on knowledge graphs. Knowledge graphs are developed on the basis of knowledge bases. They are essentially a semantic network with a basic unit of "entity-relationship-entity" or "entity-entity-relationship" triple structure. They are designed to describe concepts, entities, events and the complex relationships between them in the objective world in a structured form. Entities and attributes are represented by nodes, and relationships are represented by directed edges. They are stored in graph databases and have a fast logical reasoning speed. Knowledge graphs can be constructed through steps such as knowledge collection, knowledge processing, knowledge extraction, knowledge representation, and knowledge storage. Among them, knowledge extraction is the core step, and the extraction method of entities and relationships is a hot topic in academic research. Knowledge graphs have strong logical reasoning capabilities. At present, they have demonstrated their powerful power in the fields of intelligent search and dialogue question and answer, and have become the core driving force for the development of artificial intelligence.

[0125] The specific steps of the knowledge graph for rapid judgment of multiple cascading faults in this embodiment are as follows:

[0126] Based on the knowledge graph of power control, the above fault characteristics such as equipment tripping, protection action, switch displacement, fault phase, reclosing action, etc. are organically integrated to form complete fault analysis information and reveal the root cause of power grid faults. The identified entities and entity relationships are stored in the form of triples, as shown in the following figure. Figure 3 The knowledge graph for rapid judgment of multiple cascading faults in power grids is shown.

[0127] The fault handling process module is connected with the fault information perception module and the multiple cascading fault module, and based on the fault event information obtained by the fault information perception module and the equipment association information obtained by the multiple cascading fault module, queries the fault plan knowledge graph, matches the fault handling process plan, and establishes a communication group for outputting fault handling process operation prompts and information interaction;

[0128] In this embodiment, based on the efficient reasoning ability of the knowledge graph, the control procedures and experience can be integrated into knowledge to form a knowledge graph for rapid judgment of multiple cascading faults in the power grid. By automatically sensing the comprehensive intelligent alarm signal issued by the comprehensive intelligent alarm, matching the knowledge graph for rapid judgment of multiple cascading faults in the power grid, and combining the actual operation of the power grid, the disposal strategy is automatically generated, and the line fault disposal is completed in a guided manner under human-computer interaction.

[0129] In a preferred but non-restrictive embodiment of the present invention, the fault handling process module is used to match the accident plan, fault handling experience and scheduling procedures according to the fault event information, so as to establish a fault handling process and a fault handling group for outputting fault handling process operation prompts and information exchange; the fault event handling process is a handling process generated after analyzing the accident plan, fault handling experience, accident handling manual and scheduling procedures. At the same time, each process has two states: to be processed and completed, which is convenient for the control personnel to direct the fault handling, and at the same time establish a group of fault-related operation and maintenance and repair units.

[0130] Specifically, when a certain power grid equipment fails and returns comprehensive intelligent alarm information, the multi-level collaborative module locates the equipment and returns the attribute information of the equipment. The fault handling process module determines the fault and the operation and maintenance unit to which it belongs based on the fault event information, obtains the personnel information of the operation and maintenance unit, and establishes a communication platform (the system internal communication software or other instant messaging software can be used) as a fault handling group. Through the fault plan knowledge graph, a query is performed to find a matching fault handling plan, and then a handling process is established in combination with the dispatching procedures, accident handling manuals, and fault handling experience to guide the dispatcher to handle the fault. The knowledge graph of the fault handling process is used to characterize the handling operations and their sequence for achieving fault elimination; each handling operation of the fault handling process is set with a status display; when it is determined that the operator has not performed a certain handling operation, the status corresponding to the handling operation is displayed as pending; when the operator completes a certain handling operation, the status corresponding to the certain handling operation is changed to completed.

[0131] The risk perception module is connected to the fault information perception module and the fault handling process module, and determines whether there is an over-limit risk based on the power grid whose fault handling is completed obtained by the fault handling process module, the real-time operation status information of the power grid obtained by the fault information perception module, and the fault event information.

[0132] In a preferred but non-limiting embodiment of the present invention, the risk perception module is used to determine whether there is a risk of main transformer, line over-limit, main transformer and busbar power failure, and section over-limit after the fault event handling process is completed according to the real-time operation status of the power grid and the fault event information. If it is determined that there is no risk, jump to the fault handling closing module.

[0133] The risk handling module is connected to the risk perception module. Based on the judgment result of the risk perception module on the over-limit risk, if there is an over-limit risk, the unit output adjustment strategy is preferentially adopted; when the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all over-limit risks are eliminated;

[0134] In a preferred but non-restrictive embodiment of the present invention, the risk handling module is used to prioritize the unit output adjustment strategy after determining that there is an over-limit risk, and when the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all risks are eliminated. The information of the unit output adjustment strategy includes the unit name, the plant to which it belongs, the sensitivity, the adjustment amount, the value before adjustment, the value after adjustment, the upper and lower limits, the affected equipment and the affected amount; the information of the load adjustment strategy includes the priority, the load name, the plant to which it belongs, the sensitivity, the total amount of power restriction, and the affected amount.

[0135] Specifically, the unit output adjustment strategy is based on the sensitivity analysis method, giving priority to adjusting the units with higher sensitivity, and determining the unit adjustment amount through the upper and lower limit outputs of the units until the section and branch over-limit values ​​are eliminated or all units have been used up.

[0136] Specifically, the load output adjustment strategy is based on the sensitivity analysis method, which gives priority to adjusting the loads with the highest sensitivity, and determines the corresponding over-limit adjustment amount according to the over-limit value of the section and branch. As long as the over-limit adjustment amount is not zero, the load adjustment will continue until the over-limit value of the section and branch is eliminated or all the loads are used up.

[0137] The fault handling and finishing module is connected to the risk perception module and the risk handling module. Based on the power grid after the risk of over-limit is eliminated obtained by the risk perception module and the risk handling module, the equipment is restored to power and the status is recovered, including: checking the equipment's forced power supply, orderly power consumption, busbar connection adjustment, conventional load transfer, and status recovery.

[0138] If the equipment loses power after busbar connection adjustment and conventional load transfer, the forced power supply condition is judged. If it meets the conditions, the forced power supply operation is carried out; if it does not meet the conditions, the judgment on whether to ignore the judgment result and directly force power supply is carried out; if it is ignored, the forced power supply operation is carried out; if it is not ignored, the equipment is decommissioned.

[0139] In a preferred but non-restrictive embodiment of the present invention, the fault handling and finishing module is used to analyze the actual situation after eliminating the risk of over-limit. If there is power failure of equipment after busbar connection adjustment and conventional load transfer, it is determined whether the fault meets the conditions for forced power transmission. If it meets the conditions for forced power transmission, forced power transmission is automatically performed; if not, it is determined whether to ignore the judgment result and directly force power transmission according to external instructions; if the external manual operation chooses to ignore, forced power transmission is performed; if the external manual operation chooses not to ignore, the equipment is decommissioned.

[0140] The analysis of the actual situation in the fault handling closing module refers to whether the protection is operating normally, whether the line is listed, whether there is a maintenance application form for the line, whether the line is an overhead line, whether the weather is not typhoon weather, and whether the current on each side of the transformer of the fault-connected substation is within the limit;

[0141] The protection action information includes: line name, protection device type, protection device model, protection action time, whether failure protection is activated, whether main protection action is activated, and whether backup protection is activated. When it is determined that failure protection, main protection action, and backup protection are all activated normally, the corresponding protection device is considered to be in normal action.

[0142] The line signage information includes: line name, whether live work signage is available, and whether maintenance work signage is available. When both live work signage and maintenance work signage are determined to be yes, it is considered that the corresponding line has line signage information.

[0143] The line maintenance application form information includes: application form number, physical equipment name, physical equipment ID, decommissioning approval start time, and decommissioning approval end time. Match the fault ID (ID_DEV) of the integrated intelligent alarm table with the physical equipment ID (DEV_ID) of the maintenance application form in the control cloud. If the match is successful, determine whether the current time is within the decommissioning approval start time (PASS_BEGIN_TIME) and decommissioning approval end time (PASS_END_TIME). If it is within this time, it is considered that the corresponding line has maintenance application form information, otherwise there is no maintenance application form information.

[0144] The current on each side of the transformer of the faulty connected substation does not exceed the limit (when the current value is less than the set current). The information includes: transformer name, plant name, high-voltage side current value, medium-voltage side current value, and low-voltage side current value.

[0145] Whether the protection is working normally is divided into three categories:

[0146] Category 1: Failure protection does not operate, at least one set of main protection operates, and backup protection may or may not operate, indicating normal protection operation;

[0147] Category 2: Failure protection and main protection do not operate, only backup protection operates, which is an abnormal protection operation;

[0148] Category 3: Only the failure protection action is abnormal.

[0149] The fault reporting module is connected to the fault information perception module, the multiple cascade fault module, the fault handling process module, the risk handling module, and the fault handling closing module, and is used to generate and store a power grid fault report based on the fault event processing information.

[0150] In a preferred but non-limiting embodiment of the present invention, the fault handling report module is used to generate and store a power grid fault report based on the fault event and the corresponding adjustment strategy and operation. The power grid fault report information includes: fault name, fault occurrence time, fault location, fault equipment, fault cause, fault voltage level, fault discoverer, weather and other basic information related to the fault. The generated report is stored in the historical fault handling information for the review of pictures, statistical tables and explanatory texts after the fault is handled.

[0151] In a preferred but non-limiting embodiment of the present invention, the present invention can be implemented using a D5000 platform or a control cloud platform.

[0152] Embodiment 3 of the present invention provides a terminal, including a processor and a storage medium;

[0153] The storage medium is used to store instructions;

[0154] The processor is configured to operate according to the instructions to execute any step of the method.

[0155] Embodiment 4 of the present invention provides a computer-readable storage medium, on which is stored a program for a method for handling multiple cascading failures in a power grid. When the program is executed by a processor, any step of a method for handling multiple cascading failures in a power grid described in the above technical solution is implemented.

[0156] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention realizes the rapid collection of effective information and fault location by collecting and integrating information related to fault events in the integrated intelligent alarm system and the SCADA system. The judgment of multiple cascading faults is realized by establishing a knowledge graph of multiple cascading faults; the real-time operation risk analysis caused by power grid faults is completed by using network analysis technologies such as topological search, and the power grid risk is analyzed by eventing and objectifying information related to power grid faults, and the control personnel are assisted in executing the phased power grid fault handling in an automatic process-based guidance manner, realizing the full process monitoring of the handling process, ensuring the efficiency and standardization of the handling process, effectively improving the efficiency of power grid fault handling, reducing the workload of control personnel, and improving the work level of dispatching safety production.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for handling multiple cascading faults in a power grid, characterized in that: The following steps are involved: Construct a knowledge graph for rapid judgment of multiple cascading failures; Obtain grid fault event information through comprehensive intelligent alarm information and monitor the real-time operation status of the grid; Based on the fault event information, combined with the knowledge graph of multiple cascading faults rapid judgment, the fault type is identified and the device-related information is obtained; According to the fault event information and equipment related information, query the fault plan knowledge map, match the fault handling process plan, and establish a fault handling group for outputting fault handling process operation prompts and information exchange; Based on the power grid after fault handling, determine whether there is a risk of over-limit according to the real-time operation status of the power grid and fault event information; Based on the risk assessment results, the unit output adjustment strategy is prioritized for the existing risk of over-limit; When the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all over-limit risks are eliminated; based on the power grid after the over-limit risk is eliminated, the actual situation is analyzed to perform equipment power restoration and status recovery operations.

2. A method for handling multiple cascading failures in a power grid according to claim 1, characterized in that: A power grid fault report is generated and stored based on the fault event information, fault handling process, and corresponding adjustment strategies and operations.

3. A method for handling multiple cascading failures in a power grid according to claim 1, characterized in that: Building a knowledge graph for rapid judgment of multiple cascading failures includes the following steps: Build a basic knowledge graph to collect and organize power regulation data; Build a business process management knowledge graph to collect and organize typical application scenarios; Build the relationship between the basic knowledge graph and the business process management knowledge graph, integrate the characteristics of the control data and scenarios, and obtain a knowledge graph for rapid judgment of multiple cascading failures.

4. A method for handling multiple cascading failures in a power grid according to claim 1, characterized in that: According to the fault event information and equipment association information, the fault plan knowledge graph is queried to match the fault handling process plan, and a fault handling group is established for outputting fault handling process operation prompts and information exchange, including the following steps: Based on the equipment association information, the matching fault handling plan is obtained by querying the fault plan knowledge graph; Based on the fault handling plan, combined with data and experience, establish operational prompts for the fault handling process; According to the fault event information, determine the fault and the operation and maintenance unit to which it belongs, obtain the personnel information of the operation and maintenance unit, and establish a communication platform as a fault handling group; Based on the established operation prompts and fault handling groups, the operation prompts for updating the fault handling process are output in real time through the fault handling group, and information exchange is carried out.

5. A method for handling multiple cascading faults in a power grid according to claim 4, characterized in that: The operational prompts of the fault handling process are used to characterize the handling operations and their sequence for eliminating the fault; each handling operation of the fault handling process is set with a status display; when it is determined that the operator has not performed a certain handling operation, the status corresponding to the handling operation is displayed as pending; when the operator completes a certain handling operation, the status corresponding to the handling operation is changed to completed.

6. A method for handling multiple cascading failures in a power grid according to claim 1, characterized in that: Judging whether there is an over-limit risk includes: judging whether there is a risk of main transformer, line over-limit, main transformer and busbar power failure, and section over-limit; Judging whether there is a risk of main transformer or line exceeding the limit includes: Real-time comparison of the active power and rated capacity data of the main transformer of the power grid. If the real-time value of the active power of the main transformer exceeds the rated capacity of the main transformer, it means that there is a risk of the main transformer exceeding the limit; otherwise, there is no risk of the main transformer exceeding the limit; Compare the line current and current upper limit data of the power grid in real time. If the real-time value of the line phase current exceeds the line current upper limit, it means that there is a risk of line over-limit; otherwise, there is no risk of line over-limit; Judging whether there is a risk of main transformer and busbar power failure includes: Monitor the real-time main transformer current of the power grid. If the currents on all sides of the main transformer are zero, it means that there is a risk of power failure in the main transformer; otherwise, there is no risk of power failure in the main transformer. Monitor the real-time bus voltage of the power grid. If the three-phase voltages of the bus are all zero, it means that there is a risk of power failure on the bus; otherwise, there is no risk of power failure on the bus; Judging whether there is a risk of cross-section exceeding the limit includes: Comparing the real-time section active power and steady-state limit data of the power grid, if the real-time value of the section active power flow exceeds the section steady-state limit value, it means that there is a risk of section exceeding the limit; otherwise, there is no risk of section exceeding the limit.

7. A method for handling multiple cascading failures in a power grid according to claim 1, characterized in that: The strategies for adjusting the unit output include: Based on the sensitivity analysis method, the sensitivity values ​​of the over-limit section and branch to the unit are obtained respectively; the positive and negative sensitivity values ​​corresponding to the over-limit section and branch are sorted in descending order according to the absolute value of the sensitivity, and the sensitivity information of the top-ranked units corresponding to the over-limit section and branch are obtained respectively; the sensitivity information of the top units is calculated respectively to obtain the section active power reduction and the branch active power reduction; if the section active power reduction exceeds the section remaining over-limit amount, and the branch active power reduction exceeds the branch remaining over-limit amount, the output adjustment of the unit is terminated; otherwise, the output adjustment of the adjustable unit continues.

8. A method for handling multiple cascading failures in a power grid according to claim 1, characterized in that: Load adjustment strategies include: A sensitivity analysis method is adopted to obtain the positive sensitivity values ​​of the section and branch to any load respectively, and the positive sensitivity values ​​corresponding to the section and branch are sorted in descending order according to the sensitivity, and the load sensitivity information corresponding to the section and branch with the top sorting is obtained respectively; the top positive sensitivity values ​​are calculated to obtain the section active power flow reduction and the branch active power flow reduction respectively; if the section active power flow reduction exceeds the section residual over-limit, and the branch active power flow reduction exceeds the branch residual over-limit, the load adjustment strategy is terminated; otherwise, the load is continuously subjected to accident power rationing until the section residual over-limit and the branch residual over-limit are eliminated or all positive sensitivities have been selected.

9. A method for handling multiple cascading faults in a power grid according to claim 1, characterized in that: The analysis of the actual situation includes: based on the power grid after eliminating the risk of over-limit, analyzing whether the protection is operating normally, whether the line is listed, whether there is a maintenance application form for the line, whether the line is an overhead line, whether the weather is not typhoon weather, and whether the current on each side of the transformer of the faulty connected substation is within the limit.

10. A method for handling multiple cascading faults in a power grid according to claim 9, characterized in that: The equipment power restoration and status recovery operations include: checking the equipment power transmission, orderly power consumption, busbar connection adjustment, conventional load transfer, and status recovery; If the busbar connection is adjusted, the conventional load is transferred, and the equipment loses power, it is determined whether the fault meets the conditions for forced power transmission. If it meets the conditions, forced power transmission is performed; if it does not meet the conditions, it is determined whether to ignore the judgment result of the forced power transmission conditions and directly perform forced power transmission; if the external command is ignored, the forced power transmission is performed directly; if the external command is not ignored, the equipment is decommissioned; The conditions for determining whether to meet the requirements for forced power transmission include: Determine whether the protection is in normal operation, the fault is not listed, there is no maintenance application form for the fault, the fault is an overhead line, the weather is not typhoon weather, and the current on each side of the transformer of the substation connected to the fault is within the limit.

11. A system for handling multiple cascading faults in a power grid, running a method for handling multiple cascading faults in a power grid as claimed in any one of claims 1 to 10, comprising: The knowledge graph construction module, the fault information perception module, the multiple cascading fault module, the fault handling process module, the risk perception module, the risk handling module, the fault handling closing module and the fault reporting module are characterized in that: Knowledge graph construction module, used to construct a knowledge graph for rapid judgment of multiple cascading faults in power grids; Fault information perception module, used to obtain fault event information of the power grid through comprehensive intelligent alarm information, and collect real-time operation status of the power grid; The multiple cascading fault module is connected with the fault information perception module and the knowledge graph construction module. Based on the fault event information obtained by the fault information perception module and the knowledge graph of multiple cascading faults of the power grid obtained by the knowledge graph construction module, the multiple cascading faults of the power grid are identified and the equipment association information is obtained. The fault handling process module is connected with the fault information perception module and the multiple cascading fault module. It is used to query the fault plan knowledge graph based on the fault event information obtained by the fault information perception module and the equipment association information obtained by the multiple cascading fault module, match the fault handling process plan, and establish a communication channel for fault handling process operation prompts and information interaction; The risk perception module is connected with the fault information perception module and the fault handling process module. Based on the power grid whose fault handling is completed obtained by the fault handling process module, the real-time operation status information of the power grid obtained by the fault information perception module and the fault event information, it determines whether there is an over-limit risk. If it is determined that there is no risk, it jumps to the fault handling closing module. The risk handling module is connected to the risk perception module. Based on the judgment result of the risk perception module on the over-limit risk, if there is an over-limit risk, the unit output adjustment strategy is adopted first; when the unit adjustment strategy cannot eliminate the over-limit risk, the load adjustment strategy is adopted until all over-limit risks are eliminated; The fault handling and finishing module is connected with the risk perception module and the risk handling module, and performs equipment power restoration and status recovery operations based on the power grid after eliminating the over-limit risk obtained by the risk perception module and the risk handling module; The fault reporting module is connected with the fault information perception module, the multiple cascade fault module, the fault handling process module, the risk perception module, the risk handling module, and the fault handling closing module, and is used to generate and store power grid fault reports based on fault event processing information.

12. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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