New energy station network-related relay protection setting value verification method and system

Abstract

The invention relates to the technical field of power system relay protection verification, in particular to a new energy station network-related relay protection constant value verification method and system. Comprising the following steps: establishing a relay protection equipment digital twinborn model by using primary system data information; generating a constant value single template with a calculation formula based on the constant value single reverse estimation calculation formula of the station to be verified, and loading the constant value single template to the digital twinborn model of the relay protection equipment; constructing a power grid system operation fault simulation model, performing simulation analysis on relay protection equipment, and calculating a theoretical constant value based on a protection action by using a constant value single template; and calculating the difference value between the theoretical verification result and the actual verification result, marking the relay protection equipment of which the difference value exceeds the verification threshold value, and downloading the theoretical constant value to the marked relay protection equipment. The problems that constant value verification is efficiently completed, the verified constant value is updated, and safe fusion of a new energy field station and a power grid is guaranteed are solved.

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 in new energy stations. Background Art

[0002] As the proportion of new energy sites such as wind farms and photovoltaic power plants in the power system has risen rapidly. The traditional power system mainly relies on conventional energy such as thermal power and hydropower for power generation, and its operating characteristics are relatively stable and predictable. In contrast, the output power of new energy sites is complex and changeable due to the natural intermittent and volatile energy used. Furthermore, at the current stage of batch commissioning of new energy sites, facing numerous sites, massive protection devices and frequently updated operating conditions, traditional verification methods are difficult to meet the actual needs of fast and accurate verification.

[0003] Due to the instability of power generation at new energy stations, the operation mode of the power grid needs to be constantly adjusted to adapt to power changes, which leads to the need for frequent updates of grid-related relay protection settings. However, the existing verification methods lack efficiency, and each update of the setting requires repeated tedious manual operations. In addition, traditional verification methods often focus on the verification of the setting under steady-state conditions, which makes it difficult to fully simulate the complex transient processes of new energy stations, such as rapid switching of power electronic converters, high-frequency oscillations at the moment of power grid failure, etc., making the reliability of the setting low.

[0004] To sum up, in view of 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 power grids. Summary of the invention

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

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

[0007] A method for checking the fixed value of a grid-related relay protection in 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 set values ​​based on protection actions and using a set value single template, conduct simulation verification analysis on the theoretical set values ​​to obtain theoretical verification results;

[0011] Obtain the actual set values ​​of the relay protection equipment that have been 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, wherein 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, and 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 in a minimum mode, and system reactance in a maximum mode;

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

[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. 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 checked, 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 , the theoretical action accuracy rate P1 under the qualified action time. If there is no action within the qualified action time, the theoretical constant value is recalculated;

[0024] Perform logic check on the theoretical set value, and conduct the next level check for the set value that passes the logic check, and recalculate the theoretical set value if it fails;

[0025] Perform 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.

[0026] Furthermore, simulation verification analysis is performed to obtain actual verification results, 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 P2 of the action under qualified action time.

[0027] Furthermore, the difference between the calculated theoretical verification result and the actual verification result is expressed by the formula: Verify threshold value with Δ th It indicates that the verification threshold ranges from 0.05 to 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 value entered into the relay protection device from the OMS system, load the actual set value into the digital twin model of the relay protection device, perform simulation verification analysis and obtain the actual verification result;

[0033] The constant 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 to the marked relay protection equipment through the OMS system to complete the update of the relay protection constant.

[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 in a new energy station.

[0035] In a fourth aspect, the present invention provides a terminal device including a processor and a computer-readable storage medium, the processor being used to implement various instructions; the computer-readable storage medium being used to store a plurality of instructions, the instructions being suitable for being loaded by the processor and executing the method for checking the constant value of a grid-related relay protection in a new energy station.

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

[0037] 1. The present invention proposes a method and system for checking the fixed value of grid-related relay protection in a new energy station. With the help of digital twin technology, the actual operating conditions of the station are accurately reproduced in digital form. Based on the fixed value calculation formula of the station to be checked, a fixed value single template with a calculation formula is generated. Combined with the actual data obtained from the OMS system, the standardization and automation of the fixed value calculation are realized. Compared with the traditional manual repeated calculation of the fixed value, the manpower input is greatly reduced, and the fixed value verification can be completed quickly under the variable operating conditions of the new energy station.

[0038] 2. The present invention proposes a method and system for checking the fixed value of relay protection in a new energy station, and constructs a power grid system operation fault simulation model, which covers fault types such as infinite impedance fault and zero impedance fault, and simulates the steady-state and transient working conditions that the new energy station may encounter in actual operation, making up for the deficiency of the traditional verification method that focuses on steady-state working condition verification. The theoretical fixed value and the actual fixed value are verified from multiple dimensions such as sensitivity, action time, logic and rules, and the rationality of the fixed value is considered in all aspects.

[0039] 3. The present invention proposes a method and system for checking the fixed value of network-related relay protection in a new energy station, which has intelligent fixed 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 fixed value needs to be updated. Once the difference exceeds the threshold, the system automatically marks and downloads the theoretical fixed value to the corresponding relay protection equipment through the OMS system, realizing the intelligent updating of the fixed value. Even if an erroneous fixed value is manually input due to misoperation, 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 Example 1 of the present invention. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0042] Example 1

[0043] Reference Figure 1 A method for checking the fixed value of a grid-related relay protection of a new energy station in this embodiment includes:

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

[0047] Digital twin model of staged current protection: The action current threshold is set according to the three-stage principle of current protection. For example, for the quick-break current protection section, the action current constant 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 action time is set to 0s (instantaneous action). In the time-limited current quick-break protection section, the action current is smaller than that of the quick-break section, and the action 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 action current is set according to the maximum load current and the return coefficient (usually 0.85-0.95) is considered. The action time is coordinated according to the step principle and can be up to several seconds.

[0048] Distance protection digital twin model: Using the impedance parameters of the line, the line is divided into multiple sections for protection. The measurement impedance is calculated based on the ratio of bus voltage to line current, and the action characteristics use circular characteristics or polygonal characteristics. For example, for phase-to-phase distance protection, the mho circular characteristic is used, and its setting value is calculated based on factors such as line length and system impedance. The action time is also calculated according to the step coordination principle. The action time of short lines is shorter, and that of long lines is relatively longer.

[0049] Longitudinal current differential digital twin model: By comparing the magnitude and phase of the current at both ends of the line, the full-line fast-acting protection is realized. Its action criterion is that the current difference at both ends is greater than the differential action current setting value, which is determined based on factors such as line capacitance current and unbalanced current and combined with the reliability coefficient, and the action time is close to 0s.

[0050] Digital twin model of braking current differential protection: mainly used for busbar protection. It compares the current difference flowing into and out of the busbar and introduces a braking coefficient (generally 0.8-1.2) to prevent false operation. The action 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 the backup protection of the busbar, the operating current is determined by avoiding the maximum load current of the normal operation of the busbar and taking into account a certain margin. The operating time is coordinated with the protection of adjacent components and is generally around 1-2s.

[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 continues to exist 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] Digital twin model for circuit breaker failure protection: In case of line or component failure and circuit breaker refusal to operate, the model detects that the fault current persists and the circuit breaker tripping signal has not returned. After a delay (generally 0.2-0.4s), the adjacent circuit breakers are tripped to expand the power outage scope and prevent the fault from further expanding.

[0055] S2. 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 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 in a minimum mode, and system reactance in a maximum mode;

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

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

[0060] System reactance under minimum mode: determined by 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 checked, 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. 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 stage I setting;

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

[0068] Parameter meaning: Z op is the action impedance constant, 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 It 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 that 60000A, the current transformer ratio 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 according to the fixed value calculation formula. rel is 1.25.

[0080] S3. Construct 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, perform simulation verification analysis on the theoretical fixed values ​​and obtain theoretical verification results;

[0081] The construction of the power grid system operation fault simulation model includes building a circuit fault simulation model based on the digital twin model of the relay protection device and using a π-type equivalent circuit based on distributed parameters, and the line is equivalent to a π-type circuit according to the actual parameters of the line, wherein the series resistance and reactance simulate the line transmission characteristics, and the parallel capacitor simulates the line-to-ground capacitance. The circuit fault type is added to the π-type equivalent circuit.

[0082] Infinite impedance fault: simulates the open circuit condition of the line. 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 behavior of the protection under the 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, testing the protection's ability to respond quickly to short circuit faults.

[0084] Parameter drift fault: simulate line parameter changes due to aging, environment 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: The ground resistance is set 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), and examines 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, and analyze the protection performance under this special 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 , the theoretical action accuracy rate P1 under the qualified action time. If there is no action within the qualified action time, the theoretical constant value is recalculated;

[0090] Perform logic check on the theoretical set value. For the set value that passes the logic check, perform the next level check. If it fails, recalculate the theoretical set value. The logic check is used to check the coordination logic between different protections, such as whether the action sequence of stage current protection and distance protection at different fault locations is correct. Taking the short-circuit fault in the near area as an example, the quick-break current protection should be activated first. If the quick-break protection refuses to operate, the time-limited current quick-break protection should operate within the specified time. The distance protection is used as a backup, and its action time should be later than the time-limited current quick-break protection. If the logic does not match, recalculate the theoretical set value.

[0091] The theoretical set value is checked by rules. For the set value that passes the rule check, the theoretical set value is checked. If it fails, the theoretical set value is recalculated. The rule check is used to check whether the theoretical set value meets the requirements according to the rules of the power grid operation procedures, technical specifications of relay protection equipment, etc. For example, it is stipulated that the action time of a certain protection cannot exceed a certain limit, and the result of the set value calculation cannot exceed the allowable range of the equipment (such as the action current cannot be greater than 5 times the rated current of the equipment). If it does not meet the requirements, the theoretical set value is recalculated.

[0092] S4. Obtain the actual set values ​​of the relay protection equipment that have been 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;

[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 calculated theoretical verification result and the actual verification result is expressed by the formula:

[0096] Verify threshold value with Δ th It indicates that the verification threshold ranges from 0.05 to 0.15.

[0097] When Δ>Δ th , the relay protection device whose marking difference exceeds the verification threshold means that the setting of the device is unreasonable. The theoretical setting needs to be downloaded to the marking device through the OMS system to complete the setting 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 value entered into the relay protection device from the OMS system, load the actual set value into the digital twin model of the relay protection device, perform simulation verification analysis and obtain the actual verification result;

[0104] The constant 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 to the marked relay protection equipment through the OMS system to complete the update of the relay protection constant.

[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 checking 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 checking the constant value of a grid-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 protection scope 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 protection scope 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 set values ​​based on protection actions and using a set value single template, conduct simulation verification analysis on the theoretical set values ​​to obtain theoretical verification results; Obtain the actual set values ​​of the relay protection equipment that have been 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 checking the fixed value of the grid-related relay protection of the 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 in a minimum mode, and system reactance in a maximum mode; Use the data in the relay protection setting database and the setting calculation formula of the station to be checked to infer the setting value; 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. The fixed value calculation formula is embedded in the fixed value single template.

3. The method for checking the fixed value of relay protection for a new energy station according to claim 1 is characterized in that: 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 checked, 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.

4. The method for checking the fixed value of relay protection for a new energy station according to claim 1 is characterized in that: The method of constructing a power grid system operation fault simulation model includes constructing a circuit fault simulation model based on a digital twin model of a relay protection device using a π-type equivalent circuit based on distributed parameters, and adding a circuit fault type to the π-type equivalent circuit.

5. The method for checking the fixed value of relay protection for a new energy station according to claim 1 is characterized in that: The simulation verification analysis of the theoretical fixed value to obtain the theoretical verification result includes: 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 , the theoretical action accuracy rate P1 under the qualified action time. If there is no action within the qualified action time, the theoretical constant value is recalculated; Perform logic check on the theoretical set value, and conduct the next level check for the set value that passes the logic check, and recalculate the theoretical set value if it fails; Perform 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.

6. The method for checking the fixed value of relay protection for a 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 K based on simulation verification analysis sen2 , the actual action accuracy P2 of the action under qualified action time.

7. The method for checking the fixed value of relay protection for a new energy station according to claim 1 is characterized in that: The difference between the calculated theoretical verification result and the actual verification result is expressed by the formula: The verification threshold ranges from 0.05 to 0.

15.

8. 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 actual set value verification module is configured to obtain the actual set value entered into the relay protection device from the OMS system, load the actual set value into the digital twin model of the relay protection device, perform simulation verification analysis and obtain the actual verification result; The constant 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 to the marked relay protection equipment through the OMS system to complete the update of the relay protection constant.

9. A computer-readable storage medium storing a plurality of instructions, characterized in that: The instruction is suitable for being loaded by a processor of a terminal device and executing a method for checking the constant value of grid-related relay protection in a new energy station as described in claim 1.

10. A terminal device, comprising a processor and a computer-readable storage medium, wherein the processor is used to implement each instruction; and the computer-readable storage medium is used to store multiple instructions, characterized in that: The instruction is suitable for being loaded by a processor and executing a method for checking the constant value of grid-related relay protection in a new energy station as described in claim 1.

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