A method and system for checking fixed value of network-related relay protection in new energy stations

Abstract

The present invention relates to the technical field of relay protection verification of power systems, and in particular to a method and system for verifying constant values of relay protection in power grids of new energy stations. The method comprises establishing a digital twin model of relay protection equipment using primary system data information; inferring a constant value calculation formula based on the constant value list of the station to be verified, generating a constant value single template with the calculation formula, and loading the constant value single template into the digital twin model of relay protection equipment; constructing a power grid system operation fault simulation model, conducting simulation analysis on relay protection equipment, and inferring theoretical constant values based on protection actions and using the constant value single template; calculating the difference between the theoretical verification result and the actual verification result, marking the relay protection equipment whose difference exceeds the verification threshold, and downloading the theoretical constant value to the marked relay protection equipment. The method solves the problem of efficiently completing constant value verification and updating the verified constant value to ensure the safe integration of new energy stations and power grids.

Description

Technical Field

[0001] The present invention relates to the technical field of relay protection verification of power systems, and in particular to a method and system for verifying fixed value of grid-related relay protection at new energy stations. Background Art

[0002] With the rapid increase in the proportion of new energy sites such as wind farms and photovoltaic power plants in the power system, traditional power systems mainly rely on conventional energy sources such as thermal power and hydropower for power generation, and their operating characteristics are relatively stable and highly predictable. In contrast, the output power of new energy sites exhibits complex and variable trends due to the inherent intermittent and fluctuating energy sources they use. Furthermore, at the current stage of mass commissioning of new energy sites, faced with numerous sites, a large number of protection devices, and frequently updated operating conditions, traditional calibration methods are unable to meet the real needs of fast and accurate calibration.

[0003] Due to the unstable power generation of renewable energy stations, the grid's operating mode needs to be constantly adjusted to adapt to power fluctuations. This leads to the need for frequent updates of relay protection settings. However, existing verification methods lack efficiency, and each update requires repeated and tedious manual operations. Furthermore, traditional verification methods often focus on verifying settings under steady-state conditions, making it difficult to fully simulate the complex transient processes that renewable energy stations experience, such as the rapid switching of power electronic converters and high-frequency oscillations at the moment of grid faults. This results in low reliability of the settings.

[0004] In summary, given the unique operating characteristics of new energy stations, a method and system for checking the constant values of grid-related relay protection in new energy stations is needed to efficiently complete the constant value verification and update the verified constant values to ensure the safe integration of new energy stations and the power grid. Summary of the Invention

[0005] In order to solve the problem of efficiently completing constant value verification and updating the verified constant values to ensure the safe integration of new energy stations and power grids, the present invention provides a method and system for verifying constant values of grid-related relay protection in new energy stations.

[0006] In a first aspect, the present invention provides a method for verifying the fixed value of network-related relay protection in a new energy station, which adopts the following technical solution:

[0007] A method for verifying fixed values of grid-related relay protection at a new energy station, comprising:

[0008] Obtain primary system data information and use it to build a digital twin model of relay protection equipment;

[0009] Obtain the set value list of the station to be calibrated from the OMS system, infer the set value calculation formula based on the set value list of the station to be calibrated, generate a set value list template with the calculation formula, and load the set value list template into the digital twin model of the relay protection equipment;

[0010] Construct a power grid system operation fault simulation model, conduct simulation analysis on relay protection equipment, calculate theoretical fixed values based on protection actions and using fixed value single templates, and conduct simulation verification analysis on the theoretical fixed values to obtain theoretical verification results;

[0011] Obtain the actual set values of the relay protection equipment entered from the OMS system, load the actual set values into the digital twin model of the relay protection equipment, perform simulation verification analysis, and obtain the actual verification results;

[0012] Calculate the difference between the theoretical verification result and the actual verification result, introduce a verification threshold, mark the relay protection equipment whose difference exceeds the verification threshold, and download the theoretical setting to the marked relay protection equipment through the OMS system to complete the update of the relay protection setting.

[0013] Furthermore, the acquisition of primary system data information includes deploying a sensor array in the new energy station. The sensor array is a mutual inductor for measuring bus current, voltage and power, and a Hall sensor for capturing high-frequency harmonics and transient impact current. The data collected by the sensor array is aggregated to the station edge computing gateway.

[0014] Furthermore, the establishment of a digital twin model of relay protection equipment includes relay protection equipment modeling and primary system simulation modeling. The relay protection equipment modeling includes a staged current protection digital twin model, a distance protection digital twin model, and a longitudinal current differential digital twin model. The primary system simulation modeling includes a braking current differential protection digital twin model, a bus charging protection digital twin model, a bus overcurrent protection digital twin model, a bus failure protection and dead zone protection digital twin model, and a circuit breaker failure protection digital twin model.

[0015] Furthermore, the generating of a fixed value single template with a calculation formula includes:

[0016] Establishing a relay protection setting database based on the digital twin model of the relay protection device, wherein the relay protection setting database includes bus data, line data, system reactance under the minimum mode, and system reactance under the maximum mode;

[0017] Use the data in the relay protection setting database and the setting value calculation formula of the station to be verified to infer the setting value by single inversion;

[0018] A standardized fixed value single template is created in a table format. The table header includes the protection type, fixed value name, calculation formula, parameter meaning, data source and calculation result, and the fixed value calculation formula is embedded in the fixed value single template.

[0019] Furthermore, the fixed value calculation formula is: E op =K rel ×n ct ×E max , where E op is the fixed value in the fixed value list of the station to be calibrated, K rel is the reliability coefficient, n ct is the transformation ratio of the current transformer or voltage transformer, E max It is the maximum current, voltage or impedance of the protected line.

[0020] Furthermore, the construction of the power grid system operation fault simulation model includes constructing a circuit fault simulation model based on the digital twin model of the relay protection equipment using a π-type equivalent circuit based on distributed parameters, and adding circuit fault types to the π-type equivalent circuit.

[0021] Furthermore, the circuit fault types include infinite impedance fault, zero impedance fault, parameter drift fault, high resistance grounding fault, line flashover fault and series capacitor compensation fault.

[0022] Furthermore, the simulation verification analysis of the theoretical fixed value to obtain the theoretical verification result includes:

[0023] The sensitivity and action time of the theoretical set value are checked, and the theoretical sensitivity K is obtained based on the simulation verification analysis. sen1 , Theoretical action accuracy rate P1 under qualified action time. If there is no action within the qualified action time, the theoretical value is recalculated;

[0024] Perform logic verification on the theoretical set value, and proceed to the next level of verification for the set value that passes the logic verification, and recalculate the theoretical set value if it fails;

[0025] Perform rule verification on the theoretical constants. For the constants that pass the rule verification, complete the theoretical constant verification. If they fail, recalculate the theoretical constants.

[0026] Furthermore, simulation verification analysis is performed and actual verification results are obtained, including sensitivity and action time verification of the actual set value. The actual sensitivity K is obtained based on the simulation verification analysis. sen2 , the actual action accuracy rate P2 of the action under qualified action time.

[0027] Furthermore, the difference between the theoretical verification result and the actual verification result is expressed as follows: Verify threshold value with Δ th Indicates that the verification threshold range is 0.05-0.15.

[0028] In the second aspect, a new energy station grid-related relay protection setting value verification system includes:

[0029] The digital twin model building module is configured to obtain primary system data information and use the primary system data information to build a digital twin model of the relay protection device;

[0030] The setting list template generation module is configured to obtain the setting list of the station to be verified from the OMS system, infer the setting value calculation formula based on the setting list of the station to be verified, generate a setting list template with the calculation formula, and load the setting list template into the digital twin model of the relay protection device;

[0031] The theoretical set value verification module is configured to construct a power grid system operation fault simulation model, perform simulation analysis on the relay protection equipment, calculate the theoretical set value based on the protection action and using the set value single template, and perform simulation verification analysis on the theoretical set value to obtain the theoretical verification result;

[0032] The actual set value verification module is configured to obtain the actual set values entered into the relay protection device from the OMS system, load the actual set values into the digital twin model of the relay protection device, perform simulation verification analysis, and obtain the actual verification results;

[0033] The constant value update module is configured to calculate the difference between the theoretical verification result and the actual verification result, introduce a verification threshold, mark the relay protection equipment whose difference exceeds the verification threshold, and download the theoretical constant value to the marked relay protection equipment through the OMS system to complete the update of the relay protection constant value.

[0034] In a third aspect, the present invention provides a computer-readable storage medium storing a plurality of instructions, wherein the instructions are suitable for being loaded and executed by a processor of a terminal device, for example, a method for verifying the constant values of grid-related relay protection at a new energy station.

[0035] In a fourth aspect, the present invention provides a terminal device comprising a processor and a computer-readable storage medium, wherein the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for being loaded and executed by the processor as a method for verifying the constant values of network-related relay protection in a new energy station.

[0036] In summary, the present invention has the following beneficial technical effects:

[0037] 1. This invention proposes a method and system for verifying the fixed value of relay protection at a new energy station. Leveraging digital twin technology, the system accurately reproduces the actual operating conditions of the station in digital form. This system generates a fixed value template with a calculation formula based on the fixed value calculation formula of the station to be verified. Combined with actual data obtained from the operating management system (OMS), this system standardizes and automates the calculation of fixed values. Compared to traditional manual repetitive value calculations, this method significantly reduces manpower input and enables rapid verification of fixed values under the variable operating conditions of new energy stations.

[0038] 2. This invention proposes a method and system for verifying relay protection constants for renewable energy stations. The system constructs a grid system operational fault simulation model that covers fault types such as infinite impedance faults and zero impedance faults. This model simulates both steady-state and transient operating conditions that renewable energy stations may encounter in actual operation, addressing the shortcomings of traditional verification methods that focus on steady-state conditions. Theoretical and actual constants are verified from multiple perspectives, including sensitivity, action time, logic, and rules, comprehensively evaluating the rationality of the constants.

[0039] 3. The present invention proposes a method and system for checking the constant value of network-related relay protection in a new energy station. It has intelligent constant value updates. By calculating the difference between the theoretical verification result and the actual verification result and introducing a reasonable verification threshold, it can determine whether the constant value needs to be updated. Once the difference exceeds the threshold, the system automatically marks it and downloads the theoretical constant value to the corresponding relay protection equipment through the OMS system, realizing the intelligent update of the constant value. Even if an incorrect constant value is manually input due to an erroneous operation, it can be identified and corrected because the calculated result is greater than the threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flowchart of the method for verifying the constant values of grid-related relay protection in a new energy station according to embodiment 1 of the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] Reference Figure 1 A method for verifying fixed values of network-related relay protection in a new energy station according to this embodiment includes:

[0044] S1. Obtain primary system data information and use the primary system data information to establish a digital twin model of the relay protection equipment.

[0045] The acquisition of primary system data information includes deploying a sensor array in the new energy station. The sensor array is a mutual inductor for measuring bus current, voltage and power, and a Hall sensor for capturing high-frequency harmonics and transient impact current. The data collected by the sensor array is aggregated to the station edge computing gateway.

[0046] The establishment of a digital twin model of relay protection equipment includes relay protection equipment modeling and primary system simulation modeling. The relay protection equipment modeling includes a staged current protection digital twin model, a distance protection digital twin model, and a longitudinal current differential digital twin model. The primary system simulation modeling includes a braking current differential protection digital twin model, a busbar charging protection digital twin model, a busbar overcurrent protection digital twin model, a busbar failure protection and dead zone protection digital twin model, and a circuit breaker failure protection digital twin model.

[0047] Staged current protection digital twin model: The operating current threshold is set based on the three-stage principle of current protection. For example, for the quick-break current protection section, the operating current value is determined based on the maximum short-circuit current of the line and combined with the reliability coefficient (generally 1.2-1.3), and its operating time is set to 0s (instantaneous action). In the time-limited current quick-break protection section, the operating current is smaller than that of the quick-break section, and the operating time is generally set between 0.3-0.5s. The specific value is determined by coordinating with the adjacent line protection. In the overcurrent protection section, the operating current is set according to the maximum load current and taking into account the return coefficient (usually 0.85-0.95). The operating time is coordinated according to the step principle and can be up to several seconds.

[0048] Distance protection digital twin model: Utilizing line impedance parameters, the line is divided into multiple sections for protection. The measured impedance is calculated based on the ratio of bus voltage to line current, and the operating characteristics are circular or polygonal. For example, for phase-to-phase distance protection, a mho circular characteristic is used, with the setting value calculated based on factors such as line length and system impedance. The operating time is also based on a stepped principle, with shorter operating times for short lines and longer operating times for long lines.

[0049] The longitudinal current differential digital twin model achieves fast-acting protection for the entire line by comparing the magnitude and phase of the currents at both ends of the line. Its action criterion is that the current difference between the two ends is greater than the differential action current setting, which is determined based on factors such as line capacitance and unbalanced current, combined with a reliability factor. The action time is close to 0s.

[0050] Digital twin model of brake-type current differential protection: mainly used for busbar protection. It compares the current difference between the inflow and outflow of the busbar and introduces a brake coefficient (generally 0.8-1.2) to prevent false operation. The operating current constant is calculated based on the short-circuit current under the maximum operating mode of the busbar.

[0051] Digital twin model of busbar charging protection: It is put into operation when the busbar is charging. The operating current is set according to the maximum impact current when the busbar circuit breaker is closed, which is usually 3-5 times the rated current of the busbar. The operating time is short, generally 0.1-0.2s.

[0052] Digital twin model of busbar overcurrent protection: As backup protection for the busbar, the operating current is determined by avoiding the maximum load current of the busbar during normal operation and taking into account a certain margin. The operating time is coordinated with the protection of adjacent components and is generally around 1-2 seconds.

[0053] Digital twin model of busbar failure protection and dead zone protection: When the busbar circuit breaker fails, the failure protection is activated. The action criterion is that the fault current persists and the tripping signal of the busbar circuit breaker has not returned. After a certain delay (generally 0.3-0.5s), all circuit breakers connected to the faulty busbar are tripped. The dead zone protection is used to solve the protection dead zone problem between the busbar knife switch and the circuit breaker. The action principle is similar, and the action time is coordinated with the failure protection.

[0054] Circuit breaker failure protection digital twin model: In the event of line or component failure or circuit breaker refusal to operate, the model detects that the fault current persists and the circuit breaker trip signal has not returned. After a delay (generally 0.2-0.4s), the model trips the adjacent circuit breakers to expand the power outage range and prevent the fault from further expanding.

[0055] S2. Obtain the set value sheet of the station to be calibrated from the OMS system, infer the set value calculation formula based on the set value sheet of the station to be calibrated, generate a set value sheet template with the calculation formula, and load the set value sheet template into the digital twin model of the relay protection device;

[0056] The generating of a fixed value single template with a calculation formula includes:

[0057] Establishing a relay protection setting database based on the digital twin model of the relay protection device, wherein the relay protection setting database includes bus data, line data, system reactance under the minimum mode, and system reactance under the maximum mode;

[0058] Bus data: record bus rated voltage, short-circuit capacity (calculated by system impedance), etc.

[0059] Line data: includes line length, resistance per unit length, reactance per unit length, line capacitance, etc. These data are used for calculating line protection settings.

[0060] System reactance under minimum mode: determined through power flow calculation or system impedance measurement, reflecting the equivalent reactance of the system under minimum operating mode, and is an important parameter for calculating protection settings.

[0061] System reactance under maximum mode: used for protection setting verification under different operating modes.

[0062] Using the data in the relay protection setting database and the setting value calculation formula of the station to be checked, the setting value calculation formula is: E op =K rel ×n ct ×E max , where E op is the fixed value in the fixed value list of the station to be calibrated, K rel is the reliability coefficient, n ct is the transformation ratio of the current transformer or voltage transformer, E max It is the maximum current, voltage or impedance of the protected line.

[0063] A standardized fixed value single template is created in a table format. The table header includes the protection type, fixed value name, calculation formula, parameter meaning, data source and calculation result, and the fixed value calculation formula is embedded in the fixed value single template.

[0064] For example, the distance protection for a certain line is as follows:

[0065] Protection type: distance protection;

[0066] Setting name: Phase distance I setting value;

[0067] Calculation formula: Z op =K rel ×Z L ;

[0068] Parameter meaning: Z op is the fixed value of action impedance, K rel is the reliability coefficient, Z L is the positive sequence impedance of the protected line;

[0069] Data source: relay protection setting database;

[0070] Calculation results: K of distance protection rel value

[0071] Taking distance protection as an example, Z op The positive sequence impedance of the protection line is Z, which is 4.32Ω. L is 3.6Ω, and the reliability coefficient K is calculated rel is 1.2.

[0072] The current protection for the line is as follows:

[0073] Protection type: current protection;

[0074] Setting name: quick-break current setting;

[0075] Calculation formula: I op =K rel ×n ct ×I max;

[0076] Parameter meaning: I op is the fixed value in the fixed value list to be verified, K rel is the reliability coefficient, n ct is the current transformer ratio, I max is the maximum current value of the protected line.

[0077] Data source: relay protection setting database;

[0078] Calculation results: K of current protection rel value.

[0079] Taking line current protection as an example, I op Given a current transformer ratio of 60000A, n ct =300 / 5. For a certain collector line, the maximum current I of the protected line is known in the relay protection setting database. max The line reliability factor K is calculated based on the fixed value calculation formula. rel is 1.25.

[0080] S3. Build a power grid system operation fault simulation model, perform simulation analysis on relay protection equipment, calculate theoretical fixed values based on protection actions and using a fixed value single template, and perform simulation verification analysis on the theoretical fixed values to obtain theoretical verification results;

[0081] The power grid system operational fault simulation model is constructed by using a distributed parameter π-type equivalent circuit based on a digital twin model of relay protection equipment to construct a circuit fault simulation model. The line is equivalent to a π-type circuit based on actual line parameters, in which series resistance and reactance simulate line transmission characteristics, and shunt capacitance simulates line-to-ground capacitance. Circuit fault types are then incorporated into the π-type equivalent circuit.

[0082] Infinite impedance fault: simulates an open circuit situation. At this time, the current at the fault point is 0 and the voltage is close to the power supply voltage. It is used to verify the action of the protection under an open circuit fault.

[0083] Zero impedance fault: equivalent to a short circuit fault, the voltage at the fault point is 0, and the current increases instantaneously, which tests the protection's ability to respond quickly to short circuit faults.

[0084] Parameter drift fault: simulate line parameter changes due to aging, environmental factors and other factors, such as a 20% increase in resistance and a ±10% change in reactance, to observe whether the protection setting can still adapt to such changes to ensure long-term operational reliability.

[0085] High-resistance ground fault: Set the ground resistance to several hundred ohms or even thousands of ohms to test whether the protection can operate accurately under this fault.

[0086] Line flashover fault: simulates instantaneous discharge of the line to the ground due to insulation damage and other reasons. The fault duration is short (generally tens of microseconds to several milliseconds) to examine the protection's ability to capture transient faults.

[0087] Series capacitor compensation fault: When the line uses series capacitor compensation to improve the transmission capacity, simulate the capacitor short circuit, open circuit or parameter change fault to analyze the protection performance under this special working condition.

[0088] The simulation verification analysis of the theoretical fixed value to obtain the theoretical verification result includes:

[0089] The sensitivity and action time of the theoretical set value are checked, and the theoretical sensitivity K is obtained based on the simulation verification analysis. sen1 , Theoretical action accuracy rate P1 under qualified action time. If there is no action within the qualified action time, the theoretical value is recalculated;

[0090] Theoretical settings are logically checked. Values that pass this check proceed to the next level of verification; those that fail require a recalculation of the theoretical value. This logic check verifies the coordination logic between different protections, such as whether the sequence of operation of staged current protection and distance protection at different fault locations is correct. For example, in the case of a short-circuit fault in the vicinity, the instantaneous current protection should operate first. If this protection fails to operate, the time-limited current instantaneous protection should operate within the specified timeframe. The distance protection, acting as a backup, should operate later than the time-limited current instantaneous protection. If the logic does not match, the theoretical value is recalculated.

[0091] Theoretical values are checked for compliance with rules. If they pass, the theoretical values are verified; if they fail, they are recalculated. This rule-based verification verifies that theoretical values meet requirements based on grid operating procedures, relay protection equipment technical specifications, and other regulations. For example, if a protection action time cannot exceed a certain limit, or if the calculated value cannot exceed the device's allowable range (e.g., the action current cannot exceed five times the device's rated current), the theoretical values are recalculated if these requirements are not met.

[0092] S4. Obtain the actual set values of the relay protection device that have been entered from the OMS system, load the actual set values into the digital twin model of the relay protection device, perform simulation verification analysis, and obtain the actual verification results;

[0093] Conduct simulation verification analysis and obtain actual verification results, including sensitivity and action time verification of actual set values, and obtain actual sensitivity K based on simulation verification analysis sen2 , the actual action accuracy rate P2 of the action under the qualified action time. Similar to the theoretical verification, the actual sensitivity K is obtained through statistical analysis of actual operation data sen2 And the actual action accuracy rate P2 of the action under the qualified action time.

[0094] S5. Calculate the difference between the theoretical verification result and the actual verification result, introduce a verification threshold, mark the relay protection devices whose difference exceeds the verification threshold, and download the theoretical setting to the marked relay protection devices through the OMS system to complete the update of the relay protection setting.

[0095] The difference between the theoretical verification result and the actual verification result is expressed as follows:

[0096] Verify threshold value with Δ th Indicates that the verification threshold range is 0.05-0.15.

[0097] When Δ>Δ th , the relay protection device whose marking difference exceeds the verification threshold means that the setting value of the device is unreasonable. The theoretical setting value needs to be downloaded to the marking device through the OMS system to complete the setting value update; when Δ≤Δ th , it is considered that the deviation between the actual set value and the theoretical set value is acceptable and will not be updated for the time being.

[0098] Example 2

[0099] This embodiment provides a new energy station grid-related relay protection setting value verification system, including:

[0100] The digital twin model building module is configured to obtain primary system data information and use the primary system data information to build a digital twin model of the relay protection device;

[0101] The setting list template generation module is configured to obtain the setting list of the station to be verified from the OMS system, infer the setting value calculation formula based on the setting list of the station to be verified, generate a setting list template with the calculation formula, and load the setting list template into the digital twin model of the relay protection device;

[0102] The theoretical set value verification module is configured to construct a power grid system operation fault simulation model, perform simulation analysis on the relay protection equipment, calculate the theoretical set value based on the protection action and using the set value single template, and perform simulation verification analysis on the theoretical set value to obtain the theoretical verification result;

[0103] The actual set value verification module is configured to obtain the actual set values entered into the relay protection device from the OMS system, load the actual set values into the digital twin model of the relay protection device, perform simulation verification analysis, and obtain the actual verification results;

[0104] The constant value update module is configured to calculate the difference between the theoretical verification result and the actual verification result, introduce a verification threshold, mark the relay protection equipment whose difference exceeds the verification threshold, and download the theoretical constant value to the marked relay protection equipment through the OMS system to complete the update of the relay protection constant value.

[0105] A computer-readable storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded and executed by a processor of a terminal device, and a method for verifying the constant value of a grid-related relay protection of a new energy station is disclosed.

[0106] A terminal device includes a processor and a computer-readable storage medium, the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for being loaded and executed by the processor. A method for verifying the constant value of network-related relay protection in a new energy station is described.

[0107] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for checking the fixed value of relay protection in a new energy station, characterized in that: include: Obtain primary system data information and use it to build a digital twin model of relay protection equipment; Obtain the set value list of the station to be calibrated from the OMS system, infer the set value calculation formula based on the set value list of the station to be calibrated, generate a set value list template with the calculation formula, and load the set value list template into the digital twin model of the relay protection equipment; Construct a power grid system operation fault simulation model, conduct simulation analysis on relay protection equipment, calculate theoretical fixed values based on protection actions and using fixed value single templates, and conduct simulation verification analysis on the theoretical fixed values to obtain theoretical verification results; The construction of the power grid system operation fault simulation model includes constructing a circuit fault simulation model based on the digital twin model of the relay protection equipment using a π-type equivalent circuit based on distributed parameters, and adding circuit fault types to the π-type equivalent circuit; The simulation verification analysis of the theoretical fixed value to obtain the theoretical verification result includes: Check the sensitivity and action time of the theoretical set value, and obtain the theoretical sensitivity based on simulation verification analysis , Theoretical action accuracy under qualified action time If there is no action within the qualified action time, the theoretical value is recalculated; Perform logic verification on the theoretical set value, and proceed to the next level of verification for the set value that passes the logic verification, and recalculate the theoretical set value if it fails; Conduct rule verification on the theoretical set value. For the set value that passes the rule verification, complete the theoretical set value verification. If it fails, recalculate the theoretical set value. Obtain the actual set values of the relay protection equipment entered from the OMS system, load the actual set values into the digital twin model of the relay protection equipment, perform simulation verification analysis, and obtain the actual verification results; Calculate the difference between the theoretical verification result and the actual verification result, introduce a verification threshold, mark the relay protection equipment whose difference exceeds the verification threshold, and download the theoretical setting to the marked relay protection equipment through the OMS system to complete the update of the relay protection setting.

2. The method for verifying the fixed value of network-related relay protection of a new energy station according to claim 1 is characterized in that: The generating of a fixed value single template with a calculation formula includes: Establishing a relay protection setting database based on the digital twin model of the relay protection device, wherein the relay protection setting database includes bus data, line data, system reactance under the minimum mode, and system reactance under the maximum mode; Use the data in the relay protection setting database and the setting value calculation formula of the station to be verified to infer the setting value by single inversion; A standardized fixed value single template is created in a table format. The table header includes the protection type, fixed value name, calculation formula, parameter meaning, data source and calculation result, and the fixed value calculation formula is embedded in the fixed value single template.

3. The method for checking the fixed value of network-related relay protection of a new energy station according to claim 1 is characterized in that: The fixed value calculation formula is: ,in is the set value in the set value list of the station to be checked, is the reliability coefficient, is the transformation ratio of the current transformer or voltage transformer, It is the maximum current, voltage or impedance of the protected line.

4. The method for verifying the fixed value of the network-related relay protection of the new energy station according to claim 1 is characterized in that: Conduct simulation verification analysis and obtain actual verification results, including sensitivity and action time verification of actual set values, and obtain actual sensitivity based on simulation verification analysis , the actual action accuracy of the action under the qualified action time .

5. The method for checking the fixed value of network-related relay protection of a new energy station according to claim 4 is characterized in that: The difference between the theoretical verification result and the actual verification result is expressed as follows: , the verification threshold range is 0.05-0.

15.

6. A new energy station grid-related relay protection fixed value verification system, characterized in that: include: The digital twin model building module is configured to obtain primary system data information and use the primary system data information to build a digital twin model of the relay protection device; The setting list template generation module is configured to obtain the setting list of the station to be verified from the OMS system, infer the setting value calculation formula based on the setting list of the station to be verified, generate a setting list template with the calculation formula, and load the setting list template into the digital twin model of the relay protection device; The theoretical set value verification module is configured to construct a power grid system operation fault simulation model, perform simulation analysis on the relay protection equipment, calculate the theoretical set value based on the protection action and using the set value single template, and perform simulation verification analysis on the theoretical set value to obtain the theoretical verification result; The construction of the power grid system operation fault simulation model includes constructing a circuit fault simulation model based on the digital twin model of the relay protection equipment using a π-type equivalent circuit based on distributed parameters, and adding circuit fault types to the π-type equivalent circuit; The simulation verification analysis of the theoretical fixed value to obtain the theoretical verification result includes: Check the sensitivity and action time of the theoretical set value, and obtain the theoretical sensitivity based on simulation verification analysis , Theoretical action accuracy under qualified action time If there is no action within the qualified action time, the theoretical value is recalculated; Perform logic verification on the theoretical set value, and proceed to the next level of verification for the set value that passes the logic verification, and recalculate the theoretical set value if it fails; Conduct rule verification on the theoretical set value. For the set value that passes the rule verification, complete the theoretical set value verification. If it fails, recalculate the theoretical set value. The actual set value verification module is configured to obtain the actual set values entered into the relay protection device from the OMS system, load the actual set values into the digital twin model of the relay protection device, perform simulation verification analysis, and obtain the actual verification results; The constant value update module is configured to calculate the difference between the theoretical verification result and the actual verification result, introduce a verification threshold, mark the relay protection equipment whose difference exceeds the verification threshold, and download the theoretical constant value to the marked relay protection equipment through the OMS system to complete the update of the relay protection constant value.

7. A computer-readable storage medium storing a plurality of instructions, characterized in that: The instruction is suitable for being loaded and executed by the processor of the terminal device according to a method for verifying the constant value of network-related relay protection of a new energy station as claimed in claim 1.

8. A terminal device comprising a processor and a computer-readable storage medium, wherein the processor is configured to implement various instructions; and the computer-readable storage medium is configured to store a plurality of instructions, wherein: The instructions are suitable for being loaded and executed by a processor according to a method for verifying the constant values of grid-related relay protection in a new energy station as described in claim 1.

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