Static voltage checking method and device

Abstract

The application discloses a static voltage checking method and device. After obtaining a power flow data file and a set of open elements, the application uses a power flow calculation program to simulate and obtain an initial node voltage set. Each element in the set of open elements is opened one by one and simulated, and it is judged whether the calculation result converges; if the calculation result converges, the corresponding node voltage is read. Then, the node voltages are compared with the initial voltage set, the voltage deviation and the out-of-limit condition are calculated, and finally, a fault voltage out-of-limit table is generated, recording the out-of-limit voltage, the out-of-limit type and the deviation rate of each node. The application not only improves the analysis efficiency of the influence of the power grid fault, but also accurately records the out-of-limit condition, provides specific guidance information for the operation, maintenance and optimization of the power grid, and solves the problem that a large number of voltages in the power system cannot be efficiently checked in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of static voltage calibration, and in particular to a static voltage calibration method and device. Background Art

[0002] After introducing the BPA power system simulation calculation software, the Electric Power Research Institute further developed and improved it to form a Chinese version of the BPA program (PSD-BPA) suitable for power system analysis and calculation, which has been widely used in power system planning and design, grid dispatching and operation, and teaching and scientific research departments.

[0003] The "Statistical Analysis Method of Reactive Voltage by the Southern Power Grid Dispatching Organization" stipulates the power grid voltage quality control standards. Among them, in normal operation mode, the allowable deviation of the 500kV bus voltage is 0% to +10% of the system rated voltage (500kV to 550kV), and the allowable deviation of the 220kV bus voltage is 0% to +10% of the system rated voltage (220kV to 242kV). For buses whose voltage levels have a significant impact on system safety and stability, the dispatching organization should clarify the lower limit of their allowable voltage deviation based on the results of the system safety and stability analysis.

[0004] When preparing annual reactive power and voltage operation plans, power grid dispatching departments need to conduct an N-1 static voltage safety analysis of the power grid system under different operating modes to identify vulnerable buses. Currently, the standard practice for these calculations is to selectively select a group of components (lines or transformers), manually disconnect each component in the BPA power flow data file (with the suffix dat) to perform power flow calculations and check for resulting bus voltage over-limit conditions. This method is not only prone to omissions but also cumbersome and time-consuming. An alternative approach utilizes BPA's N-1 disconnection simulation function, where the program automatically disconnects components in a designated zone to perform an N-1 safety check. However, this method's result file only outputs component overloads and bus voltage over-limit conditions, and does not include voltage fluctuations for buses that do not exceed the voltage limit.

[0005] Currently, calculation personnel either manually disconnect components one by one in the BPA flow data file to perform flow calculations and check for resulting bus voltage over-limit conditions. However, provincial power grids often have a large number of components, and manual calculations and review of relevant voltage data are not only labor-intensive but also slow, inefficient, and prone to errors. Alternatively, they use BPA's N-1 safety check function, but this method only outputs component overloads and bus voltage over-limit conditions in its result file, omitting voltage fluctuations for buses that are within the voltage limit. These issues hinder the efficient verification of a large number of voltages in the power system using existing technologies. Summary of the Invention

[0006] The present invention provides a static voltage calibration method and device to solve the problem in the prior art that a large number of voltages in a power system cannot be efficiently calibrated.

[0007] In a first aspect, the present application provides a static voltage calibration method, comprising:

[0008] Obtain power flow data files and breaking component sets;

[0009] According to the power flow calculation program, the power flow data file is simulated to obtain the initial node voltage set of the partition to be verified;

[0010] According to the power flow calculation program, each component in the switching component set is disconnected one by one and simulated to obtain various simulation calculation results;

[0011] Determine whether the simulation results have converged, and if so, read the voltages of all nodes in the partition to be verified;

[0012] The voltages of all nodes in the partition to be checked are compared with the initial node voltage set, and the voltage deviation and voltage over-limit situation of each node voltage are calculated to obtain a fault voltage over-limit table; wherein the fault voltage over-limit table records each bus name, each over-limit type and each deviation rate of each node over-limit voltage.

[0013] This application provides a detailed data basis for the static voltage safety verification of the power grid by obtaining the power flow data file and the disconnecting element set. Then, the power flow data file is simulated using the power flow calculation program to obtain the initial node voltage set of the partition to be verified, which establishes a benchmark for the voltage distribution of the power grid under normal conditions. Then, by disconnecting and simulating each component in the disconnecting element set one by one, this method can simulate the performance of the power grid under different fault conditions and obtain various simulation calculation results. By judging whether these simulation calculation results converge, this application ensures the reliability of the simulation results. If converged, the voltage of all nodes in the partition to be verified is read. Finally, these node voltages are compared with the initial node voltage set, and the voltage deviation and voltage over-limit of each node voltage are calculated to obtain a fault voltage over-limit table. This step can accurately identify and record voltage anomalies caused by faults in the power grid. By systematically analyzing the voltage changes of the power grid under normal and fault conditions, this application can provide key voltage safety information to power grid operators, so that they can take timely measures to prevent potential voltage instability and power outages, enhance the reliability and safety of the power grid, and solve the problem of the inability to efficiently calibrate a large number of voltages in the power system in the existing technology.

[0014] As a preferred embodiment of the first aspect, the acquiring of the power flow data file and the breaking component set is specifically:

[0015] According to the power flow data file, all nodes, line branches and transformer branches in the power grid are obtained;

[0016] According to the preset screening conditions, all nodes and all line branches and transformer branches are screened to obtain the nodes, line branches and transformer branches of the partition to be verified;

[0017] Identify the record rows corresponding to the line branch and the transformer branch in the power flow file, record the busbar name and reference voltage at both ends of the branch, and the row number of the row, and obtain a breaking component set.

[0018] In this preferred embodiment, the present application first comprehensively collects information on all nodes and line and transformer branches in the power grid to ensure a complete understanding of the power grid structure. Then, using preset screening conditions, the key nodes and branches of the partition to be verified are accurately identified. This step makes the analysis more targeted and can concentrate resources and attention on the most critical parts of the power grid. Finally, by identifying and recording the corresponding record lines of the line branches and transformer branches in the flow file, including the bus name, reference voltage and number of rows, a detailed set of disconnecting elements is formed, which provides accurate data support for subsequent one-by-one disconnection and simulation calculations. The present application improves the accuracy and efficiency of power grid fault analysis by finely managing power grid data, making dynamic monitoring and risk assessment of the power grid more reliable, thereby providing a solid foundation for the safe operation and optimized management of the power grid.

[0019] As a preferred embodiment of the first aspect, the power flow data file is simulated according to the power flow calculation program to obtain the initial node voltage set of the partition to be verified, specifically:

[0020] According to the power flow calculation program, the power flow data file is simulated to obtain the initial voltage of the node of the partition to be verified;

[0021] Determining whether the initial voltages of all the components exceed a limit according to a first preset threshold;

[0022] If the initial voltage of the component is greater than a first preset threshold, confirming that the initial voltage of the component exceeds an upper limit;

[0023] Determining whether the initial voltages of all the components exceed a limit according to a second preset threshold;

[0024] If the initial voltage of the component is less than a second preset threshold, confirming that the initial voltage of the component exceeds a lower limit;

[0025] If the initial voltage of the component is neither greater than the first preset threshold nor less than the second preset threshold, confirming that the initial voltage of the component is within the limit;

[0026] An initial node voltage set is obtained according to the initial voltages that do not exceed the limit.

[0027] In this preferred embodiment, the present application simulates the flow data file using a flow calculation program to obtain the initial voltage of the partition node to be checked, providing benchmark data for the normal operation status of the power grid. Subsequently, by comparing these initial voltages with the preset thresholds, the present application can accurately determine whether the voltage of each component exceeds the safe range. Specifically, if the initial voltage of the component exceeds the upper limit threshold, the system will confirm that the voltage of the component exceeds the upper limit; if it is lower than the lower limit threshold, it will confirm that the voltage exceeds the lower limit. This binary judgment process ensures the rapid identification of voltage over-limit situations, and for those components that do not exceed the limit, their initial voltages will be included in the initial node voltage set. The present application not only improves the efficiency of monitoring the voltage status of the power grid, but also helps to prevent potential power supply problems by accurately identifying voltage over-limit situations, thereby enhancing the stability and reliability of the power grid.

[0028] As a preferred embodiment of the first aspect, the components in the disconnecting component set are disconnected one by one, and a power flow calculation program is called to simulate the power flow data file to obtain the voltage of the node of the partition to be verified, which is compared with the initial node voltage set, and the voltage deviation and voltage limit violation of each node voltage are calculated to obtain a fault voltage limit violation table, which is specifically:

[0029] The node voltage of the partition to be checked obtained by simulation calculation after disconnecting one component each time is subtracted from the initial voltage of the corresponding node in the node voltage set to obtain the voltage deviation of each node voltage in the partition to be checked;

[0030] If the node voltage of the component is greater than a first preset threshold, it is determined that the post-fault voltage of the component exceeds an upper limit;

[0031] If the node voltage of the component is less than a second preset threshold, confirming that the post-fault voltage of the component exceeds a lower limit;

[0032] According to the voltage deviation and over-limit type of each node, a fault voltage over-limit table is obtained.

[0033] In this preferred embodiment, the present application can systematically simulate the voltage response of the power grid under various fault conditions by switching the components in the disconnection component set one by one and calling the flow calculation program for simulation, thereby obtaining the voltage of the partition node to be verified. It allows the node voltage obtained by simulation calculation after each disconnection element to be accurately compared with the initial node voltage set, thereby calculating the voltage deviation of each node. The present application can accurately identify the voltage deviation and determine whether the voltage exceeds the limit, whether it exceeds the upper limit or the lower limit, based on the first preset threshold and the second preset threshold. Through this method, a detailed fault voltage over-limit table can be generated, recording the voltage deviation and over-limit type of each node, providing key voltage safety information for the power grid operator. This information is crucial for quickly identifying potential risks in the power grid, assessing the stability of the power grid, and formulating corresponding preventive measures, thereby improving the reliability and safety of the power grid.

[0034] As a preferred embodiment of the first aspect, if the node voltage of the component is greater than the first preset threshold, the post-fault voltage of the component exceeds the upper limit, further comprising:

[0035] Calculating a voltage exceeding an upper limit rate of a node whose voltage exceeds an upper limit according to the node voltage of the component, a first preset threshold value, and a first formula;

[0036] The first formula is Ui=(U-Umax) / Umax*100;

[0037] Where Umax is the first preset threshold, U is the node voltage that exceeds the upper limit, and Ui is the voltage exceeding the upper limit rate.

[0038] If the node voltage of the component is less than the second preset threshold, the post-fault voltage of the component is above the lower limit, further comprising:

[0039] Calculating a voltage lower limit rate of a node whose voltage is lower than a lower limit according to the node voltage of the component, a second preset threshold, and a second formula;

[0040] The second formula is Ui=(Umin-U) / Umin*100;

[0041] Where Umin is the second preset threshold, U is the node voltage that crosses the lower limit, and Ui is the voltage crossing the lower limit rate.

[0042] In this preferred embodiment, the present application adds a quantitative analysis of voltage over-limit conditions to the static voltage verification method. This method can not only identify nodes where the voltage exceeds a first preset threshold value (Umax) and is lower than a second preset threshold value (Umin) after a fault, but also calculates the voltage over-limit rate and the voltage over-limit rate respectively by applying the first formula Ui=(U-Umax) / Umax*100 and the second formula Ui=(Umin-U) / Umin*100, providing a specific voltage deviation percentage for the power grid operator. This quantitative analysis helps to more accurately evaluate the voltage stability of the power grid under fault conditions, allowing operators to quickly identify the severity of the voltage deviation based on the size of the over-limit rate and formulate corresponding countermeasures accordingly. This method enhances the in-depth understanding of the impact of power grid faults by providing specific numerical values ​​of voltage deviations, thereby improving the efficiency of power grid fault response and the safety of power grid operation, and ensuring the reliability of power supply.

[0043] In a second aspect, the present application provides a static voltage calibration device. The static voltage calibration device comprises an acquisition module, a first simulation module, a second simulation module, a judgment module, and a calibration module;

[0044] The acquisition module is used to obtain the power flow data file and the breaking component set;

[0045] The first simulation module simulates the power flow data file according to the power flow calculation program to obtain the initial node voltage set of the partition to be verified;

[0046] The second simulation module is used to disconnect and simulate each component in the disconnect component set one by one according to the power flow calculation program to obtain various simulation calculation results;

[0047] The judgment module is used to judge whether the simulation calculation results have converged. If converged, the voltage of all nodes in the partition to be checked is read;

[0048] The verification module is used to compare the voltages of all nodes in the partition to be verified with the initial node voltage set, and calculate the voltage deviation and voltage over-limit situation of each node voltage to obtain a fault voltage over-limit table; wherein, the fault voltage over-limit table records the bus name, each over-limit type and each deviation rate of each node over-limit voltage.

[0049] This device uses five modules to divide the work and coordinate the work to better calibrate the static voltage. This application provides a detailed data basis for the static voltage safety calibration of the power grid by obtaining the flow data file and the disconnecting element set. Then, the flow data file is simulated using the flow calculation program to obtain the initial node voltage set of the partition to be checked, which establishes a benchmark for the voltage distribution of the power grid under normal conditions. Then, by disconnecting and simulating each component in the disconnecting element set one by one, this method can simulate the performance of the power grid under different fault conditions and obtain various simulation calculation results. By judging whether these simulation calculation results converge, this application ensures the reliability of the simulation results. If converged, the voltage of all nodes in the partition to be checked is read. Finally, these node voltages are compared with the initial node voltage set, and the voltage deviation and voltage over-limit of each node voltage are calculated to obtain a fault voltage over-limit table. This step can accurately identify and record voltage anomalies caused by faults in the power grid. By systematically analyzing the voltage changes of the power grid under normal and fault conditions, this application can provide key voltage safety information to power grid operators, so that they can take timely measures to prevent potential voltage instability and power outages, enhance the reliability and safety of the power grid, and solve the problem of the inability to efficiently calibrate a large number of voltages in the power system in the existing technology.

[0050] As a preferred embodiment of the second aspect, the acquiring of the power flow data file and the breaking component set is specifically:

[0051] According to the power flow data file, all nodes, line branches and transformer branches in the power grid are obtained;

[0052] According to the preset screening conditions, all nodes and all line branches and transformer branches are screened to obtain the nodes, line branches and transformer branches of the partition to be verified;

[0053] Identify the record rows corresponding to the line branch and the transformer branch in the power flow file, record the busbar name and reference voltage at both ends of the branch, and the row number of the row, and obtain a breaking component set.

[0054] In this preferred embodiment, the present application first comprehensively collects information on all nodes and line and transformer branches in the power grid to ensure a complete understanding of the power grid structure. Then, using preset screening conditions, the key nodes and branches of the partition to be verified are accurately identified. This step makes the analysis more targeted and can concentrate resources and attention on the most critical parts of the power grid. Finally, by identifying and recording the corresponding record lines of the line branches and transformer branches in the flow file, including the bus name, reference voltage and number of rows, a detailed set of disconnecting elements is formed, which provides accurate data support for subsequent one-by-one disconnection and simulation calculations. The present application improves the accuracy and efficiency of power grid fault analysis by finely managing power grid data, making dynamic monitoring and risk assessment of the power grid more reliable, thereby providing a solid foundation for the safe operation and optimized management of the power grid.

[0055] As a preferred embodiment of the second aspect, the power flow data file is simulated according to the power flow calculation program to obtain the initial node voltage set of the partition to be verified, specifically:

[0056] According to the power flow calculation program, the power flow data file is simulated to obtain the initial voltage of the node of the partition to be verified;

[0057] Determining whether the initial voltages of all the components exceed a limit according to a first preset threshold;

[0058] If the initial voltage of the component is greater than a first preset threshold, confirming that the initial voltage of the component exceeds an upper limit;

[0059] Determining whether the initial voltages of all the components exceed a limit according to a second preset threshold;

[0060] If the initial voltage of the component is less than a second preset threshold, confirming that the initial voltage of the component exceeds a lower limit;

[0061] If the initial voltage of the component is neither greater than the first preset threshold nor less than the second preset threshold, confirming that the initial voltage of the component is within the limit;

[0062] An initial node voltage set is obtained according to the initial voltages that do not exceed the limit.

[0063] In this preferred embodiment, the present application simulates the flow data file using a flow calculation program to obtain the initial voltage of the partition node to be checked, providing benchmark data for the normal operation status of the power grid. Subsequently, by comparing these initial voltages with the preset thresholds, the present application can accurately determine whether the voltage of each component exceeds the safe range. Specifically, if the initial voltage of the component exceeds the upper limit threshold, the system will confirm that the voltage of the component exceeds the upper limit; if it is lower than the lower limit threshold, it will confirm that the voltage exceeds the lower limit. This binary judgment process ensures the rapid identification of voltage over-limit situations, and for those components that do not exceed the limit, their initial voltages will be included in the initial node voltage set. The present application not only improves the efficiency of monitoring the voltage status of the power grid, but also helps to prevent potential power supply problems by accurately identifying voltage over-limit situations, thereby enhancing the stability and reliability of the power grid.

[0064] As a preferred embodiment of the second aspect, the components in the disconnecting component set are disconnected one by one, and a power flow calculation program is called to simulate the power flow data file to obtain the voltage of the node of the partition to be verified, which is compared with the initial node voltage set, and the voltage deviation and voltage limit violation of each node voltage are calculated to obtain a fault voltage limit violation table, which is specifically:

[0065] The node voltage of the partition to be checked obtained by simulation calculation after disconnecting one component each time is subtracted from the initial voltage of the corresponding node in the node voltage set to obtain the voltage deviation of each node voltage in the partition to be checked;

[0066] If the node voltage of the component is greater than a first preset threshold, it is determined that the post-fault voltage of the component exceeds an upper limit;

[0067] If the node voltage of the component is less than a second preset threshold, confirming that the post-fault voltage of the component exceeds a lower limit;

[0068] According to the voltage deviation and over-limit type of each node, a fault voltage over-limit table is obtained.

[0069] In this preferred embodiment, the present application can systematically simulate the voltage response of the power grid under various fault conditions by switching the components in the disconnection component set one by one and calling the flow calculation program for simulation, thereby obtaining the voltage of the partition node to be verified. It allows the node voltage obtained by simulation calculation after each disconnection element to be accurately compared with the initial node voltage set, thereby calculating the voltage deviation of each node. The present application can accurately identify the voltage deviation and determine whether the voltage exceeds the limit, whether it exceeds the upper limit or the lower limit, based on the first preset threshold and the second preset threshold. Through this method, a detailed fault voltage over-limit table can be generated, recording the voltage deviation and over-limit type of each node, providing key voltage safety information for the power grid operator. This information is crucial for quickly identifying potential risks in the power grid, assessing the stability of the power grid, and formulating corresponding preventive measures, thereby improving the reliability and safety of the power grid.

[0070] As a preferred embodiment of the second aspect, if the node voltage of the component is greater than the first preset threshold, the post-fault voltage of the component exceeds the upper limit, further comprising:

[0071] Calculating a voltage exceeding an upper limit rate of a node whose voltage exceeds an upper limit according to the node voltage of the component, a first preset threshold value, and a first formula;

[0072] The first formula is Ui=(U-Umax) / Umax*100;

[0073] Where Umax is the first preset threshold, U is the node voltage that exceeds the upper limit, and Ui is the voltage exceeding the upper limit rate.

[0074] If the node voltage of the component is less than the second preset threshold, the post-fault voltage of the component is above the lower limit, further comprising:

[0075] Calculating a voltage lower limit rate of a node whose voltage is lower than a lower limit according to the node voltage of the component, a second preset threshold, and a second formula;

[0076] The second formula is Ui=(Umin-U) / Umin*100;

[0077] Where Umin is the second preset threshold, U is the node voltage that crosses the lower limit, and Ui is the voltage crossing the lower limit rate.

[0078] In this preferred embodiment, the present application adds a quantitative analysis of voltage over-limit conditions to the static voltage verification method. This method can not only identify nodes where the voltage exceeds a first preset threshold value (Umax) and is lower than a second preset threshold value (Umin) after a fault, but also calculates the voltage over-limit rate and the voltage over-limit rate respectively by applying the first formula Ui=(U-Umax) / Umax*100 and the second formula Ui=(Umin-U) / Umin*100, providing a specific voltage deviation percentage for the power grid operator. This quantitative analysis helps to more accurately evaluate the voltage stability of the power grid under fault conditions, allowing operators to quickly identify the severity of the voltage deviation based on the size of the over-limit rate and formulate corresponding countermeasures accordingly. This method enhances the in-depth understanding of the impact of power grid faults by providing specific numerical values ​​of voltage deviations, thereby improving the efficiency of power grid fault response and the safety of power grid operation, and ensuring the reliability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 : A flow chart of an embodiment of the static voltage calibration method provided by the present application;

[0080] Figure 2 : A structural diagram of an embodiment of the base state voltage exceeding the limit provided by the present application;

[0081] Figure 3 : A structural diagram of an embodiment of a calculation failure event case provided by this application;

[0082] Figure 4 : A structural diagram of an embodiment of voltage exceeding the limit after a fault provided by the present application;

[0083] Figure 5 : A structural diagram of an embodiment of the static voltage calibration method provided by the present application;

[0084] Figure 6 : A structural schematic diagram of an embodiment of the static voltage calibration device provided in this application. DETAILED DESCRIPTION

[0085] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0086] Example 1

[0087] Please refer to Figure 1, which is a static voltage calibration method provided by an embodiment of the present invention.

[0088] In this embodiment, the static voltage calibration process in this application is described in detail through steps S01-S05.

[0089] S01: Obtain the power flow data file and the breaking component set.

[0090] As a preferred embodiment of the first embodiment, the process of obtaining the disconnecting element set is specifically as follows:

[0091] (1) Read the power flow file in step S1 line by line, and determine whether the 1st to 2nd columns of the read line are "B" and whether the partition name in the 19th to 20th columns is the partition to be verified;

[0092] (2) If no, perform the operation of step (1) on the next line in the power flow file; if yes, record the bus name (columns 7 to 14) and reference voltage (columns 15 to 18) in the data of this line;

[0093] (3) Repeat (1) to (2) until all rows are read and judged, and generate the data table Tbus of all nodes in the partition to be checked. Each node is uniquely identified by the bus name and bus voltage.

[0094] (4) Read the power flow file in step S1 line by line, and determine whether the first and second columns of the read line are "L" (representing a line branch) or "T" (representing a transformer branch), and execute one of (5) to (7) according to the determination result;

[0095] (5) If the 1st to 2nd columns of the current row are "L", extract the bus name 1 (columns 7 to 14) and reference voltage 1 (columns 15 to 18) of the head end of the row, and the bus name 2 (columns 20 to 27) and reference voltage 2 (columns 28 to 31) of the end end of the row, and determine whether one of them is in the Tbus generated in (3) (one end of the line may be in another partition). If so, record the bus name and reference voltage of both ends of the line, as well as the row number of the row, and add them to the disconnection element set Eset;

[0096] (6) If the 1st to 2nd columns of the current row are "T", extract the first end bus name 1 (columns 7 to 14) and reference voltage 1 (columns 15 to 18), the end bus name 2 (columns 20 to 27) and reference voltage 2 (columns 28 to 31) of the row, and determine whether these two are in the Tbus generated in (3) (both ends of the transformer should be in the same partition). If so, record the bus name and reference voltage at both ends of the transformer branch, as well as the row number of the row, and add them to the disconnection element set Eset;

[0097] (7) If the first and second columns of the current row are neither "L" nor "T", execute (4) until all rows are judged and read, and the disconnection element set is obtained.

[0098] In this preferred embodiment, the present application first obtains all components and connection nodes in the power grid based on the flow data file, providing a comprehensive data basis for subsequent screening. Then, each component and its connection node is screened out according to the preset screening conditions, and further focus is placed on the key parts that need to be analyzed. Then, the corresponding record lines of these components and nodes in the flow file are identified and identifiers are added to obtain the disconnection component set, which enables these components to be quickly and accurately located and processed in the subsequent analysis process. Compared with the traditional method of manually selecting components from a large amount of data, this method is more efficient and accurate, avoiding omissions and errors that may be caused by manual operation, thereby providing reliable data preparation for subsequent flow calculations and voltage safety verification, helping to improve the efficiency and accuracy of the entire static voltage safety verification process, and reducing the workload of computer personnel as well as time and labor costs.

[0099] S02: According to a power flow calculation program, the power flow data file is simulated to obtain an initial node voltage set of the partition to be verified.

[0100] As a preferred embodiment of the first embodiment, the power flow data file is simulated according to the power flow calculation program to obtain the initial node voltage set of the partition to be verified, specifically:

[0101] Call BPA's power flow calculation program PFNT.exe to simulate the power flow data file and obtain the power flow result file;

[0102] Read the power flow result file to obtain the initial voltage U0 of the node in the partition to be checked;

[0103] Determine whether the initial voltage exceeds the limit. For nodes exceeding the voltage upper limit Umax, the limit-exceeding type is recorded as "upper limit exceeded", and the voltage limit-exceeding rate (%) is calculated as (U0-Umax) / Umax*100; for nodes below the voltage lower limit Umin, the limit-exceeding type is recorded as "lower limit exceeded", and the voltage limit-exceeding rate (%) is calculated as (Umin-U0) / Umin*100; the nodes with initial voltage exceeding the limit are recorded in the "base state voltage exceeding the limit" table, and the "base state voltage exceeding the limit" table is as follows: Figure 2 As shown, the nodes do not participate in the subsequent voltage comparison; the nodes whose initial voltages do not exceed the limit have their initial voltages recorded to form the node voltage set Vset.

[0104] In this preferred embodiment, the present application simulates the power flow data file by calling the BPA power flow calculation program PFNT.exe. This method accurately obtains the initial voltage distribution of the power grid under normal operating conditions. This step is crucial because it provides baseline data for subsequent voltage safety analysis. Next, by reading the power flow result file and obtaining the initial voltage U0 of the nodes in the partition to be verified, the method can perform a preliminary assessment of the voltage level at each node. Furthermore, by determining whether the initial voltage exceeds the limit and calculating the voltage limit-exceeding rate, the method can identify nodes that have already exceeded the safety range under normal operating conditions. These nodes are recorded in the "Base State Voltage Exceeding Limit" table and are excluded from subsequent voltage comparisons, thereby ensuring the accuracy and efficiency of the analysis. For nodes whose initial voltage does not exceed the limit, their initial voltage is recorded to form the node voltage set Vset, which provides the necessary data foundation for subsequent interruption simulation and voltage deviation analysis. This process can be inferred that this method not only improves the automation level of voltage safety analysis but also ensures the accuracy of subsequent analysis and the safety of power grid operation by accurately identifying and excluding nodes with base state voltage exceeding the limit.

[0105] S03: According to the power flow calculation program, each component in the switching component set is disconnected one by one and simulated to obtain various simulation calculation results.

[0106] As a preferred embodiment of the first embodiment, the power flow calculation program is used to disconnect and simulate each component in the disconnect component set one by one to obtain various simulation calculation results, specifically:

[0107] The obtained breaking component sets Eset are read one by one, and the lines of the power flow data file are commented out according to the number of the breaking component lines (a “.” is added at the beginning of the line), and the power flow calculation program of BPA is called to perform simulation calculation on the power flow data file.

[0108] S04: Determine whether the simulation calculation results have converged. If so, read the voltages of all nodes in the partition to be verified.

[0109] As a preferred embodiment of the first embodiment, the determination of whether the simulation calculation results have converged, if converged, reading the voltages of all nodes in the partition to be checked. Specifically:

[0110] Determine whether the calculation has converged based on the flow result file. If the calculation does not converge, record it in the "Calculation Failure Event" table, such as Figure 3 As shown; if the calculation converges, read the power flow results and obtain the node voltage after the disconnection element.

[0111] In this preferred embodiment, when the calculation does not converge, the application records these events in the "calculation failure event" table, such as Figure 3As shown, this allows for the rapid identification and location of cases where problems arise during the simulation process, providing clear clues and references for further analysis and problem solving, thereby avoiding ineffective analysis of problematic data and improving work efficiency. Secondly, when the calculation converges, the flow results can be read and the node voltages after the disconnected components can be obtained, providing an accurate data basis for subsequent voltage safety analysis. This data screening process, based on result stability, ensures the accuracy and reliability of the analysis, as only data that passes the convergence test is used in subsequent steps, thereby enhancing the robustness and practicality of the entire voltage safety verification method. By eliminating data that may cause errors at an early stage, this method not only optimizes the use of computing resources but also improves the quality of the overall analysis process, which is crucial for ensuring the stable operation of the power grid and preventing potential power supply problems.

[0112] S05: Compare the voltages of all nodes in the partition to be verified with the initial node voltage set, and calculate the voltage deviation and voltage over-limit situation of each node voltage to obtain a fault voltage over-limit table; wherein the fault voltage over-limit table records the bus name, each over-limit type and each deviation rate of each node over-limit voltage.

[0113] As a preferred embodiment of the first embodiment, the voltages of all nodes in the partition to be checked are compared with the initial node voltage set, and the voltage deviation and voltage over-limit of each node voltage are calculated to obtain a fault voltage over-limit table, which is specifically:

[0114] For the node voltage set Vset, add the post-fault voltage U obtained in the above steps and calculate the voltage deviation △U = U-U0. For nodes exceeding the voltage upper limit Umax, the over-limit type is recorded as "over-upper limit" and the voltage over-limit rate (%) is calculated as (U-Umax) / Umax*100. For nodes below the voltage lower limit Umin, the over-limit type is recorded as "over-lower limit" and the voltage over-limit rate (%) is calculated as (Umin-U) / Umin*100. The over-limit conditions and voltage deviations are recorded to obtain the fault voltage over-limit table, as shown in the figure. Figure 4 shown.

[0115] In this preferred embodiment, the present application adds the node voltage U obtained after the fault to the node voltage set Vset and calculates the deviation △U from the initial voltage U0. This method can accurately quantify the voltage change of the power grid after it experiences a component disconnection fault. The beneficial effect of this step is that it not only provides a direct assessment of the stability of the power grid, but also, by calculating the voltage over-limit rate, can specifically identify the nodes that exceed the voltage upper limit Umax and are lower than the voltage lower limit Umin, record them as "over the upper limit" and "over the lower limit", and calculate the corresponding voltage over-limit rate. This quantitative over-limit analysis enables power grid operators to quickly identify those areas that are most likely to be affected in the event of a fault, so that preventive or remedial measures can be taken. These over-limit situations and voltage deviations are recorded and organized into a fault voltage over-limit table, such as Figure 4 As shown, this method provides valuable data support for grid operation and maintenance, making grid management more scientific and accurate, and improving the understanding and control of grid dynamic responses. By providing detailed voltage deviation and over-limit data, this method significantly enhances the depth and breadth of grid fault analysis, providing strong data support for ensuring safe and stable grid operation.

[0116] As a preferred embodiment of the first embodiment, the overall process of voltage verification is as follows: Figure 5 As shown. By obtaining the flow data file and the disconnecting element set, the present application can fully identify the elements in the power grid and their connection relationships, laying a data foundation for subsequent simulation analysis. By obtaining the flow data file and the disconnecting element set, the present application provides a detailed data foundation for the static voltage safety verification of the power grid. Then, the flow data file is simulated using the flow calculation program to obtain the initial node voltage set of the partition to be verified, which establishes a benchmark for the voltage distribution of the power grid under normal conditions. Then, by disconnecting and simulating each element in the disconnecting element set one by one, this method can simulate the performance of the power grid under different fault conditions and obtain various simulation calculation results. By judging whether these simulation calculation results converge, the present application ensures the reliability of the simulation results. If converged, the voltage of all nodes in the partition to be verified is read. Finally, these node voltages are compared with the initial node voltage set, and the voltage deviation and voltage limit of each node voltage are calculated to obtain a fault voltage limit table. This step can accurately identify and record voltage anomalies caused by faults in the power grid. By systematically analyzing the voltage changes of the power grid under normal and fault conditions, this application can provide key voltage safety information to power grid operators, so that they can take timely measures to prevent potential voltage instability and power outages, enhance the reliability and safety of the power grid, and solve the problem of the inability to efficiently calibrate a large number of voltages in the power system in the existing technology.

[0117] Example 2

[0118] Please refer to Figure 6 , is a static voltage calibration device provided in an embodiment of the present application.

[0119] In this embodiment, the static voltage verification device includes an acquisition module 10 , a first simulation module 20 , a second simulation module 30 , a judgment module 40 and a verification module 50 .

[0120] The acquisition module 10 is used to acquire a power flow data file and a breaking component set.

[0121] As a preferred embodiment of the second embodiment, the process of obtaining the disconnecting element set is specifically as follows:

[0122] (1) Read the power flow file in step S1 line by line, and determine whether the 1st to 2nd columns of the read line are "B" and whether the partition name in the 19th to 20th columns is the partition to be verified;

[0123] (2) If no, perform the operation of step (1) on the next line in the power flow file; if yes, record the bus name (columns 7 to 14) and reference voltage (columns 15 to 18) in the data of this line;

[0124] (3) Repeat (1) to (2) until all rows are read and judged, and generate the data table Tbus of all nodes in the partition to be checked. Each node is uniquely identified by the bus name and bus voltage.

[0125] (4) Read the power flow file in step S1 line by line, and determine whether the first and second columns of the read line are "L" (representing a line branch) or "T" (representing a transformer branch), and execute one of (5) to (7) according to the determination result;

[0126] (5) If the 1st to 2nd columns of the current row are "L", extract the bus name 1 (columns 7 to 14) and reference voltage 1 (columns 15 to 18) of the head end of the row, and the bus name 2 (columns 20 to 27) and reference voltage 2 (columns 28 to 31) of the end end of the row, and determine whether one of them is in the Tbus generated in (3) (one end of the line may be in another partition). If so, record the bus name and reference voltage of both ends of the line, as well as the row number of the row, and add them to the disconnection element set Eset;

[0127] (6) If the 1st to 2nd columns of the current row are "T", extract the first end bus name 1 (columns 7 to 14) and reference voltage 1 (columns 15 to 18), the end bus name 2 (columns 20 to 27) and reference voltage 2 (columns 28 to 31) of the row, and determine whether these two are in the Tbus generated in (3) (both ends of the transformer should be in the same partition). If so, record the bus name and reference voltage at both ends of the transformer branch, as well as the row number of the row, and add them to the disconnection element set Eset;

[0128] (7) If the first and second columns of the current row are neither "L" nor "T", execute (4) until all rows are judged and read, and the disconnection element set is obtained.

[0129] In this preferred embodiment, the present application first obtains all components and connection nodes in the power grid based on the flow data file, providing a comprehensive data basis for subsequent screening. Then, each component and its connection node is screened out according to the preset screening conditions, and further focus is placed on the key parts that need to be analyzed. Then, the corresponding record lines of these components and nodes in the flow file are identified and identifiers are added to obtain the disconnection component set, which enables these components to be quickly and accurately located and processed in the subsequent analysis process. Compared with the traditional method of manually selecting components from a large amount of data, this method is more efficient and accurate, avoiding omissions and errors that may be caused by manual operation, thereby providing reliable data preparation for subsequent flow calculations and voltage safety verification, helping to improve the efficiency and accuracy of the entire static voltage safety verification process, and reducing the workload of computer personnel as well as time and labor costs.

[0130] The first simulation module 20 is used to simulate the power flow data file according to a power flow calculation program to obtain an initial node voltage set of the partition to be verified.

[0131] As a preferred embodiment of the second embodiment, the power flow data file is simulated according to the power flow calculation program to obtain the initial node voltage set of the partition to be verified, specifically:

[0132] Call BPA's power flow calculation program PFNT.exe to simulate the power flow data file and obtain the power flow result file;

[0133] Read the power flow result file to obtain the initial voltage U0 of the node in the partition to be checked;

[0134] Determine whether the initial voltage exceeds the limit. For nodes exceeding the voltage upper limit Umax, the limit-exceeding type is recorded as "upper limit exceeded", and the voltage limit-exceeding rate (%) is calculated as (U0-Umax) / Umax*100; for nodes below the voltage lower limit Umin, the limit-exceeding type is recorded as "lower limit exceeded", and the voltage limit-exceeding rate (%) is calculated as (Umin-U0) / Umin*100; the nodes with initial voltage exceeding the limit are recorded in the "base state voltage exceeding the limit" table, and the "base state voltage exceeding the limit" table is as follows: Figure 2 As shown, the nodes do not participate in the subsequent voltage comparison; the nodes whose initial voltages do not exceed the limit have their initial voltages recorded to form the node voltage set Vset.

[0135] In this preferred embodiment, the present application simulates the power flow data file by calling the BPA power flow calculation program PFNT.exe. This method accurately obtains the initial voltage distribution of the power grid under normal operating conditions. This step is crucial because it provides baseline data for subsequent voltage safety analysis. Next, by reading the power flow result file and obtaining the initial voltage U0 of the nodes in the partition to be verified, the method can perform a preliminary assessment of the voltage level at each node. Furthermore, by determining whether the initial voltage exceeds the limit and calculating the voltage limit-exceeding rate, the method can identify nodes that have already exceeded the safety range under normal operating conditions. These nodes are recorded in the "Base State Voltage Exceeding Limit" table and are excluded from subsequent voltage comparisons, thereby ensuring the accuracy and efficiency of the analysis. For nodes whose initial voltage does not exceed the limit, their initial voltage is recorded to form the node voltage set Vset, which provides the necessary data foundation for subsequent interruption simulation and voltage deviation analysis. This process can be inferred that this method not only improves the automation level of voltage safety analysis but also ensures the accuracy of subsequent analysis and the safety of power grid operation by accurately identifying and excluding nodes with base state voltage exceeding the limit.

[0136] The second simulation module 30 is used to perform a simulation calculation on each component in the switching component set one by one according to a power flow calculation program to obtain various simulation calculation results.

[0137] As a preferred embodiment of the second embodiment, the power flow calculation program is used to disconnect and simulate each component in the disconnect component set one by one to obtain various simulation calculation results, specifically:

[0138] The obtained breaking component sets Eset are read one by one, and the lines of the power flow data file are commented out according to the number of the breaking component lines (a “.” is added at the beginning of the line), and the power flow calculation program of BPA is called to perform simulation calculation on the power flow data file.

[0139] The judgment module 40 is used to judge whether the simulation calculation results have converged. If converged, the voltage of all nodes in the partition to be checked is read.

[0140] As a preferred embodiment of the second embodiment, the determination of whether the simulation calculation results converge, and if so, reading the voltages of all nodes of the partition to be checked, is specifically as follows:

[0141] Determine whether the calculation has converged based on the flow result file. If the calculation does not converge, record it in the "Calculation Failure Event" table, such as Figure 3 As shown; if the calculation converges, read the power flow results and obtain the node voltage after the disconnection element.

[0142] In this preferred embodiment, when the calculation does not converge, the application records these events in the "calculation failure event" table, such as Figure 3As shown, this allows for the rapid identification and location of cases where problems arise during the simulation process, providing clear clues and references for further analysis and problem solving, thereby avoiding ineffective analysis of problematic data and improving work efficiency. Secondly, when the calculation converges, the flow results can be read and the node voltages after the disconnected components can be obtained, providing an accurate data basis for subsequent voltage safety analysis. This data screening process, based on result stability, ensures the accuracy and reliability of the analysis, as only data that passes the convergence test is used in subsequent steps, thereby enhancing the robustness and practicality of the entire voltage safety verification method. By eliminating data that may cause errors at an early stage, this method not only optimizes the use of computing resources but also improves the quality of the overall analysis process, which is crucial for ensuring the stable operation of the power grid and preventing potential power supply problems.

[0143] The verification module 50 is used to compare the voltages of all nodes in the partition to be verified with the initial node voltage set, and calculate the voltage deviation and voltage over-limit situation of each node voltage to obtain a fault voltage over-limit table; wherein, the fault voltage over-limit table records the bus name, each over-limit type and each deviation rate of each node over-limit voltage.

[0144] As a preferred embodiment of the second embodiment, the voltages of all nodes in the partition to be checked are compared with the initial node voltage set, and the voltage deviation and voltage over-limit of each node voltage are calculated to obtain a fault voltage over-limit table, which is specifically:

[0145] For the node voltage set Vset, add the post-fault voltage U obtained in the above steps and calculate the voltage deviation △U = U-U0. For nodes exceeding the voltage upper limit Umax, the over-limit type is recorded as "over-upper limit" and the voltage over-limit rate (%) is calculated as (U-Umax) / Umax*100. For nodes below the voltage lower limit Umin, the over-limit type is recorded as "over-lower limit" and the voltage over-limit rate (%) is calculated as (Umin-U) / Umin*100. The over-limit conditions and voltage deviations are recorded to obtain the fault voltage over-limit table, as shown in the figure. Figure 4 shown.

[0146] In this preferred embodiment, the present application adds the node voltage U obtained after the fault to the node voltage set Vset and calculates the deviation △U from the initial voltage U0. This method can accurately quantify the voltage change of the power grid after it experiences a component disconnection fault. The beneficial effect of this step is that it not only provides a direct assessment of the stability of the power grid, but also, by calculating the voltage over-limit rate, can specifically identify the nodes that exceed the voltage upper limit Umax and are lower than the voltage lower limit Umin, record them as "over the upper limit" and "over the lower limit", and calculate the corresponding voltage over-limit rate. This quantitative over-limit analysis enables power grid operators to quickly identify those areas that are most likely to be affected in the event of a fault, so that preventive or remedial measures can be taken. These over-limit situations and voltage deviations are recorded and organized into a fault voltage over-limit table, such as Figure 4 As shown, this method provides valuable data support for grid operation and maintenance, making grid management more scientific and accurate, and improving the understanding and control of grid dynamic responses. By providing detailed voltage deviation and over-limit data, this method significantly enhances the depth and breadth of grid fault analysis, providing strong data support for ensuring safe and stable grid operation.

[0147] As a preferred embodiment of the second embodiment, the overall process of voltage verification is as follows: Figure 5 As shown. By obtaining the flow data file and the disconnecting element set, the present application can fully identify the elements in the power grid and their connection relationships, laying a data foundation for subsequent simulation analysis. By obtaining the flow data file and the disconnecting element set, the present application provides a detailed data foundation for the static voltage safety verification of the power grid. Then, the flow data file is simulated using the flow calculation program to obtain the initial node voltage set of the partition to be verified, which establishes a benchmark for the voltage distribution of the power grid under normal conditions. Then, by disconnecting and simulating each element in the disconnecting element set one by one, this method can simulate the performance of the power grid under different fault conditions and obtain various simulation calculation results. By judging whether these simulation calculation results converge, the present application ensures the reliability of the simulation results. If converged, the voltage of all nodes in the partition to be verified is read. Finally, these node voltages are compared with the initial node voltage set, and the voltage deviation and voltage limit of each node voltage are calculated to obtain a fault voltage limit table. This step can accurately identify and record voltage anomalies caused by faults in the power grid. By systematically analyzing the voltage changes of the power grid under normal and fault conditions, this application can provide key voltage safety information to power grid operators, so that they can take timely measures to prevent potential voltage instability and power outages, enhance the reliability and safety of the power grid, and solve the problem of the inability to efficiently calibrate a large number of voltages in the power system in the existing technology.

[0148] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A static voltage calibration method, characterized in that: include: Obtaining a power flow data file and a breaking component set; wherein the breaking component set is obtained based on the power flow data file, and all nodes, line branches, and transformer branches in the power grid; According to the preset screening conditions, all nodes and all line branches and transformer branches are screened to obtain the nodes, line branches and transformer branches of the partition to be verified; Identify the record rows corresponding to the line branch and the transformer branch in the power flow file, record the busbar names and reference voltages at both ends of the branch, and the row number of the row; According to the power flow calculation program, the power flow data file is simulated to obtain the initial node voltage set of the partition to be checked; wherein, according to the power flow calculation program, the power flow data file is simulated to obtain the initial node voltage set of the partition to be checked, specifically: According to the power flow calculation program, the power flow data file is simulated to obtain the initial voltage of the node of the partition to be verified; Determining whether the initial voltages of all components exceed a limit according to a first preset threshold; If the initial voltage of the component is greater than a first preset threshold, confirming that the initial voltage of the component exceeds an upper limit; Determining whether the initial voltages of all the components exceed a limit according to a second preset threshold; If the initial voltage of the component is less than a second preset threshold, confirming that the initial voltage of the component exceeds a lower limit; If the initial voltage of the component is neither greater than the first preset threshold nor less than the second preset threshold, confirming that the initial voltage of the component is within the limit; Obtaining an initial node voltage set based on the initial voltages that do not exceed the limit; According to the power flow calculation program, each component in the switching component set is disconnected one by one and simulated to obtain various simulation calculation results; Determine whether the simulation results have converged, and if so, read the voltages of all nodes in the partition to be verified; Comparing the voltages of all nodes in the partition to be checked with the initial node voltage set, and calculating the voltage deviation and voltage over-limit situation of each node voltage to obtain a fault voltage over-limit table; wherein the fault voltage over-limit table records each bus name, each over-limit type, and each deviation rate of each node over-limit voltage; comparing the voltages of all nodes in the partition to be checked with the initial node voltage set, and calculating the voltage deviation and voltage over-limit situation of each node voltage to obtain the fault voltage over-limit table, specifically: Subtract the node voltage of the partition to be checked obtained by simulation calculation after disconnecting one component each time from the initial voltage of the corresponding node in the initial node voltage set to obtain the voltage deviation of each node voltage in the partition to be checked; If the node voltage of the component is greater than a first preset threshold, it is determined that the post-fault voltage of the component exceeds an upper limit; If the node voltage of the component is less than a second preset threshold, confirming that the post-fault voltage of the component exceeds a lower limit; According to the voltage deviation and over-limit type of each node, a fault voltage over-limit table is obtained.

2. The static voltage calibration method according to claim 1, characterized in that: If the node voltage of the component is greater than the first preset threshold, the post-fault voltage of the component exceeds the upper limit, further comprising: Calculating a voltage exceeding an upper limit rate of a node whose voltage exceeds an upper limit according to the node voltage of the component, a first preset threshold value, and a first formula; The first formula is Ui=(U-Umax) / Umax*100; Where Umax is the first preset threshold, U is the node voltage that exceeds the upper limit, and Ui is the voltage exceeding the upper limit rate.

3. The static voltage calibration method according to claim 1, characterized in that: If the node voltage of the component is less than the second preset threshold, the post-fault voltage of the component is above the lower limit, further comprising: Calculating a voltage lower limit rate of a node whose voltage is lower than a lower limit according to the node voltage of the component, a second preset threshold, and a second formula; The second formula is Ui=(Umin-U) / Umin*100; Where Umin is the second preset threshold, U is the node voltage that crosses the lower limit, and Ui is the voltage crossing the lower limit rate.

4. A static voltage calibration device, characterized in that: It includes an acquisition module, a first simulation module, a second simulation module, a judgment module and a verification module; The acquisition module is used to obtain a power flow data file and a breaking component set; wherein the breaking component set is obtained from the power flow data file to obtain all nodes and all line branches and transformer branches in the power grid; According to the preset screening conditions, all nodes and all line branches and transformer branches are screened to obtain the nodes, line branches and transformer branches of the partition to be verified; Identify the record rows corresponding to the line branch and the transformer branch in the power flow file, record the busbar names and reference voltages at both ends of the branch, and the row number of the row; The first simulation module is used to simulate the power flow data file according to the power flow calculation program to obtain an initial node voltage set; wherein, the power flow data file is simulated according to the power flow calculation program to obtain an initial node voltage set of the partition to be verified, specifically: According to the power flow calculation program, the power flow data file is simulated to obtain the initial voltage of the node of the partition to be verified; Determining whether the initial voltages of all components exceed a limit according to a first preset threshold; If the initial voltage of the component is greater than a first preset threshold, confirming that the initial voltage of the component exceeds an upper limit; Determining whether the initial voltages of all the components exceed a limit according to a second preset threshold; If the initial voltage of the component is less than a second preset threshold, confirming that the initial voltage of the component exceeds a lower limit; If the initial voltage of the component is neither greater than the first preset threshold nor less than the second preset threshold, confirming that the initial voltage of the component is within the limit; Obtaining an initial node voltage set based on the initial voltages that do not exceed the limit; The second simulation module is used to disconnect and simulate each component in the disconnect component set one by one according to the power flow calculation program to obtain various simulation calculation results; The judgment module is used to judge whether the simulation calculation results have converged. If converged, the voltage of all nodes in the partition to be checked is read; The verification module is used to compare the voltage of the node in the partition to be verified obtained by simulation calculation after each component is disconnected with the initial voltage of the corresponding node in the node voltage set, and calculate the voltage deviation and voltage over-limit situation of each node voltage to obtain a fault voltage over-limit table; wherein the fault voltage over-limit table records the bus name, over-limit type and voltage deviation rate of the node in the partition to be verified; the voltage of the node in the partition to be verified obtained by simulation calculation after each component is disconnected with the initial voltage of the corresponding node in the node voltage set, and calculate the voltage deviation and voltage over-limit situation of each node voltage to obtain the fault voltage over-limit table, specifically: Subtract the node voltage of the partition to be checked obtained by simulation calculation after disconnecting one component each time from the initial voltage of the corresponding node in the initial node voltage set to obtain the voltage deviation of each node voltage in the partition to be checked; If the node voltage of the component is greater than a first preset threshold, it is determined that the post-fault voltage of the component exceeds an upper limit; If the node voltage of the component is less than a second preset threshold, confirming that the post-fault voltage of the component exceeds a lower limit; According to the voltage deviation and over-limit type of each node, a fault voltage over-limit table is obtained.

5. The static voltage calibration device according to claim 4, characterized in that: If the node voltage of the component is greater than the first preset threshold, the post-fault voltage of the component exceeds the upper limit, further comprising: Calculating a voltage exceeding an upper limit rate of a node whose voltage exceeds an upper limit according to the node voltage of the component, a first preset threshold value, and a first formula; The first formula is Ui=(U-Umax) / Umax*100; Where Umax is the first preset threshold, U is the node voltage that exceeds the upper limit, and Ui is the voltage exceeding the upper limit rate.

6. The static voltage calibration device according to claim 4, characterized in that: If the node voltage of the component is less than the second preset threshold, the post-fault voltage of the component is above the lower limit, further comprising: Calculating a voltage lower limit rate of a node whose voltage is lower than a lower limit according to the node voltage of the component, a second preset threshold, and a second formula; The second formula is Ui=(Umin-U) / Umin*100; Where Umin is the second preset threshold, U is the node voltage that crosses the lower limit, and Ui is the voltage crossing the lower limit rate.

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