A power plant electrical secondary circuit relay protection safety linkage control method and system

Abstract

The embodiment of the application provides a power plant electrical secondary circuit relay protection safety linkage control method and system, and relates to the technical field of power plant electrical protection. The method first acquires a real-time data set, and obtains an effective data set by performing hierarchical preprocessing on the real-time data set. Then, a relay protection safety linkage judgment model is used to output a state judgment result based on the effective data set. Then, a linkage control strategy is executed according to the state judgment result. Then, a linkage control log is generated by monitoring the execution process of the linkage control strategy, and the relay protection linkage judgment model and the linkage control strategy are dynamically optimized based on the linkage control log. The method adopts a multi-source data acquisition system, cooperates with a double judgment logic of a main criterion and a backup criterion, and improves the accuracy of state identification. The method can also dynamically correct the judgment threshold of the model and the linkage control strategy based on the linkage control log, thereby improving the reliability of the relay protection control.

Description

Technical Field

[0001] This application relates to the field of electrical protection technology for power plants, and in particular to a method and system for safety linkage control of relay protection in secondary electrical circuits of power plants. Background Technology

[0002] The secondary electrical circuits of a power plant are electrical circuits formed by the interconnection of secondary equipment. They reflect the operating status of the primary system, control the primary system, and disable the faulty parts of the primary system when a fault occurs, thus ensuring the stable operation of the power plant. The secondary electrical circuits are the core of ensuring the safe and stable operation of the primary system, undertaking key functions such as relay protection, control, and signal transmission. Their operational reliability directly determines the overall safety level of the entire power plant's electrical system. Therefore, in actual operation, relay protection control is necessary to improve the reliability of the power plant's secondary electrical circuits.

[0003] Relay protection control, or relay control for short, is an automated defense system for power system faults. When a fault occurs in a power component such as a generator, line, or transformer, or the system itself, jeopardizing safe operation, it can issue a warning signal to notify operators or directly issue a trip command to disconnect the faulty equipment, thus preventing the accident from escalating and ensuring the safe and stable operation of the system. Relay protection control can collect secondary circuit data and, in conjunction with set judgment rules, determine the operating status of the secondary circuit. Based on the judgment result, it can issue alarm signals or perform equipment linkage control to adjust the operating mode or operating parameters of each device.

[0004] However, the data acquisition methods of the aforementioned relay protection control are relatively simple, focusing only on some electrical parameters of the secondary circuit and neglecting the acquisition of the relay protection device's own status, the associated status of primary equipment, and environmental interference parameters. This results in incomplete data support, making it prone to judgment errors due to missing parameters, which in turn leads to maloperation or failure to operate of the protection device. Furthermore, due to the complex operating environment of the secondary circuit, with strong and weak current circuits intertwined, electromagnetic interference and harmonic interference are prominent issues. The aforementioned relay protection control lacks effective interference signal suppression methods, reducing the reliability of relay protection judgments. Summary of the Invention

[0005] In view of this, embodiments of this application provide a method and system for safety linkage control of relay protection in power plant electrical secondary circuits to solve the problem of low reliability of relay protection control.

[0006] According to a first aspect of this application, a method for relay protection and safety linkage control of secondary electrical circuits in a power plant is provided, the method comprising: Acquire a real-time dataset, which is multi-source data collected from the secondary circuit; the real-time dataset includes relay protection device status parameters, secondary circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters. By performing hierarchical preprocessing on the real-time dataset, an effective dataset is obtained; The relay protection safety linkage judgment model is used to output the status judgment result based on the effective dataset. The relay protection safety linkage judgment model is a dual judgment logic model that adopts a primary criterion and a backup criterion. The primary criterion is used to determine the initial state by comparing the electrical parameters of the secondary circuit with the preset protection settings. The backup criterion is used to perform collaborative verification based on the initial state, the status parameters of the relay protection device and the associated status parameters of the primary equipment. Execute the linkage control strategy based on the state judgment result; The linkage control strategy generates linkage control logs by monitoring the execution process of the linkage control strategy, and dynamically optimizes the relay protection linkage judgment model and the linkage control strategy based on the linkage control logs.

[0007] In some embodiments, a valid dataset is obtained by performing hierarchical preprocessing on the real-time dataset, including: Extract the raw acquisition data for each parameter from the real-time dataset; Calculate the standard deviation of the original collected data; Error data in the original collected data is removed based on the standard deviation. By combining the historical operating data thresholds of the equipment, invalid data that exceeds the numerical range corresponding to the historical operating data thresholds in the original collected data is removed to obtain valid original data; The valid raw data is converted into standardized data within a unified standard range to obtain the valid dataset.

[0008] In some embodiments, a relay protection safety linkage judgment model is used to output a status judgment result based on the effective dataset, including: Obtain historical linkage control logs, and set the preset protection settings based on the historical linkage control logs and the environmental interference parameters; The main criterion for the relay protection safety linkage judgment model is set based on the preset protection setting value; According to the main criterion, extract the secondary circuit electrical parameters from the valid dataset; Record the first duration during which the electrical parameters of the secondary circuit exceed the preset protection setting; The initial state is generated when the first duration reaches a set duration threshold.

[0009] In some embodiments, the relay protection safety linkage judgment model, based on the effective dataset, outputs a status judgment result, and further includes: The backup criteria of the relay protection safety linkage judgment model are invoked according to the initial state; the backup criteria include a composite criterion applicable to the power drop threshold and voltage rise under zero power conditions; According to the backup criterion, extract the status parameters of the relay protection device and the associated status parameters of the primary equipment from the valid dataset; Calculate composite judgment parameters based on the status parameters of the relay protection device and the associated status parameters of the primary equipment; Record the second duration during which the composite judgment parameter does not satisfy the composite criterion; The state judgment result is generated based on the second duration, and a linkage trigger signal is generated based on the state judgment result.

[0010] In some embodiments, executing a linkage control strategy based on the state determination result includes: Obtain the state level corresponding to the state judgment result; When the state level is higher than a preset level threshold, the level policy mapping table is invoked; the level policy mapping table includes the mapping relationship between state levels and linkage control policies; According to the state level, the linkage control strategy is queried in the level strategy mapping table. The linkage control strategy includes the linkage operation object and the linkage operation content. Based on the aforementioned linkage operation content, hierarchical linkage operation instructions are executed on the linkage operation object.

[0011] In some embodiments, the state determination result is one of the following: normal operation state, minor abnormal disturbance state, severe abnormal disturbance state, transient fault state, and permanent fault state; executing a linkage control strategy based on the state determination result includes: When the state judgment result is the normal operating state, the current operating parameters of the secondary circuit are maintained, and the redundancy check of the dual-configuration protection device is performed according to the set period. When the state judgment result is a slight abnormal disturbance, an audible and visual warning is activated, and the sensitivity parameters of the protection device are adjusted through an adaptive adjustment signal; When the state judgment result is a severe abnormal disturbance state, an emergency warning is issued, and non-critical loads in the secondary circuit are disconnected and switched to the backup circuit; When the state judgment result is a momentary fault state, the protection device is triggered to trip momentarily, and automatically recloses after the fault is cleared, and the fault data is recorded. When the status judgment result is a permanent fault state, the protection device is triggered to trip for an extended period, and the upstream and downstream associated circuits of the fault circuit are disconnected and switched to the standby circuit for operation; and the primary equipment corresponding to the fault circuit is blocked.

[0012] In some embodiments, a linkage control log is generated by monitoring the execution process of the linkage control strategy, including: Record system data, the system data including at least one of the real-time dataset, the effective dataset, the status judgment result, the linkage trigger signal, and the linkage operation content of the linkage control strategy; The process data for monitoring the execution of the linkage control strategy includes the operation time of the linkage control strategy and information on changes in the equipment operating status during the execution of the linkage control strategy; The linkage control log is generated based on the system data and the process data; The linkage control log is stored according to the set storage duration.

[0013] In some embodiments, dynamically optimizing the relay protection linkage judgment model and the linkage control strategy based on the linkage control log includes: The items to be optimized in the log data are statistically analyzed. The items to be optimized include at least one of the following: fault cases and records of invalid actions of protection devices. The fault cases are obtained by analyzing the status judgment results. The invalid actions of protection devices include records of erroneous operation or failure to operate determined based on the information on changes in the operating status of the equipment. The optimization direction is determined based on the statistical frequency of the item to be optimized; Adjust the judgment thresholds corresponding to the main criterion and the backup criterion in the relay protection linkage judgment model according to the optimization direction; Adjust the timing of the actions of the linkage control strategy according to the items to be optimized.

[0014] In some embodiments, the method further includes: Real-time acquisition of insulation and grounding data, including the insulation resistance value and grounding resistance value of the secondary circuit; Obtain the preset insulation resistance value and the grounding resistance threshold; When the insulation resistance value is lower than the preset insulation resistance value, or when the grounding resistance value exceeds the grounding resistance set threshold, an insulation warning and grounding circuit check linkage signal is generated; the grounding circuit check linkage signal is used to synchronously lock the protection device output.

[0015] According to a second aspect of this application, a power plant electrical secondary circuit relay protection safety linkage control system is provided, applied to the method described in the first aspect; the system includes: The multi-source data acquisition module is used to acquire real-time datasets, which are multi-source data collected from the secondary circuit. The real-time datasets include relay protection device status parameters, secondary circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters. The data preprocessing module is used to obtain an effective dataset by performing hierarchical preprocessing on the real-time dataset; The status judgment module is used to output the status judgment result based on the effective dataset using the relay protection safety linkage judgment model. The relay protection safety linkage judgment model is a dual judgment logic model using a primary criterion and a backup criterion. The primary criterion is used to determine the initial state by comparing the electrical parameters of the secondary circuit with the preset protection settings. The backup criterion is used to perform collaborative verification based on the initial state, the status parameters of the relay protection device, and the associated status parameters of the primary equipment. The strategy execution module is used to execute the linkage control strategy based on the state judgment result; The dynamic optimization module is used to generate linkage control logs by monitoring the execution process of the linkage control strategy, and to dynamically optimize the relay protection linkage judgment model and the linkage control strategy based on the linkage control logs.

[0016] According to a third aspect of this application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described power plant electrical secondary circuit relay protection safety linkage control method.

[0017] According to a fourth aspect of this application, a storage medium is provided that stores a computer program thereon, which, when executed by a processor, implements the above-described power plant electrical secondary circuit relay protection safety linkage control method.

[0018] By employing the above technical solutions, this application provides a method and system for relay protection safety linkage control of power plant electrical secondary circuits. The method first acquires real-time datasets collected from the secondary circuits and then performs hierarchical preprocessing on these datasets to obtain effective datasets. Next, a relay protection safety linkage judgment model is used to output state judgment results based on the effective datasets. Then, a linkage control strategy is executed according to the state judgment results. Furthermore, a linkage control log is generated by monitoring the execution process of the linkage control strategy, and the relay protection linkage judgment model and linkage control strategy are dynamically optimized based on the linkage control logs. This method employs a multi-source data acquisition system, combined with dual judgment logic of primary and backup criteria, which can reduce linkage malfunctions caused by misjudgments of single parameters and improve the accuracy of state identification. It can also dynamically correct the judgment thresholds of the model and the linkage control strategy based on the linkage control logs, thereby improving the reliability of relay protection control.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the power plant electrical secondary circuit relay protection safety linkage control method provided in the embodiments of this application; Figure 2 This is a schematic diagram of the entire process of safety linkage control provided in the embodiments of this application; Figure 3 This is a schematic diagram of the internal process of the relay protection safety linkage judgment model provided in the embodiments of this application; Figure 4 This is a schematic diagram of the process of executing the linkage control strategy based on the state judgment result provided in an embodiment of this application; Figure 5 This is a schematic diagram of the grounding insulation determination process provided in the embodiments of this application; Figure 6 A schematic diagram of the structure of the power plant electrical secondary circuit relay protection safety linkage control system provided in the embodiments of this application. Detailed Implementation

[0021] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0022] In this embodiment, the power plant electrical secondary circuit relay protection safety linkage control method and system can be applied to the power plant electrical secondary circuit to perform relay protection safety control on the secondary circuit. The power plant electrical secondary circuit is an electrical circuit formed by the interconnection of secondary equipment in the power plant. It is used to reflect the working status of the primary system, control the primary system, and disable the faulty part when a fault occurs in the primary system, thereby ensuring the stable operation of the power plant.

[0023] The secondary electrical circuits of a power plant are the core of ensuring the safe and stable operation of the primary system. They undertake key functions such as relay protection, control, and signal transmission. Their operational reliability directly determines the overall safety level of the entire power plant electrical system. Therefore, in actual operation, relay protection and control are required to improve the operational reliability of the power plant's secondary electrical circuits.

[0024] Relay protection control, or relay control for short, is an automated defense system for power system faults. When power components such as generators, lines, and transformers, or the system itself, malfunction and endanger safe operation, it can issue warning signals to notify operators or directly issue trip commands to disconnect faulty equipment, so as to prevent the accident from escalating and ensure the safe and stable operation of the system.

[0025] In some embodiments, relay protection control can collect secondary circuit data and combine it with set judgment rules to judge the operating status of the secondary circuit, and issue alarm signals or perform equipment linkage control based on the judgment results to adjust the operating mode or operating parameters of each device.

[0026] It is evident that the data acquisition methods for the aforementioned relay protection control are relatively simplistic, focusing only on some electrical parameters of the secondary circuit while neglecting the acquisition of the relay protection device's own status, the associated status of primary equipment, and environmental interference parameters. This results in incomplete data support, making it prone to judgment errors due to missing parameters, and consequently leading to maloperation or failure to operate of the protection device. Furthermore, due to the complex operating environment of the secondary circuit, with strong and weak current circuits intertwined, electromagnetic interference and harmonic interference are prominent issues, reducing the reliability of relay protection judgments.

[0027] Furthermore, the aforementioned linkage control logic uses a single parameter threshold to trigger linkage, which is susceptible to transient interference and data errors, leading to malfunctions. Simultaneously, the linkage control strategy cannot perform differentiated operations based on the severity of the fault; excessive linkage leads to an expansion of the system outage area, while untimely linkage causes fault propagation, and the control effectiveness tends to decline after long-term operation.

[0028] With the large-scale development of various power plants, including thermal, hydropower, and new energy power plants, higher requirements are placed on the accuracy, reliability, and adaptability of secondary circuit relay protection control. The above-mentioned relay protection control methods are difficult to meet the actual application needs.

[0029] To address the issue of low reliability in relay protection control, this application provides a method for safety linkage control of relay protection in power plant electrical secondary circuits in some embodiments. This method can be applied to control equipment in power plants, or to electronic devices that establish communication connections with the control equipment and possess data processing capabilities. These electronic devices include, but are not limited to, computers, servers, mobile terminals, smart wearable devices, and industrial control computers. For ease of description, this application uses control equipment as the executing entity of the method in its embodiments. It should be understood that the method can also be applied to other types of executing entities, which are not illustrated in all embodiments of this application. Figure 1 As shown, the method includes: S101. Obtain the real-time dataset.

[0030] When implementing relay protection safety linkage control, a real-time dataset can be acquired first. This real-time dataset consists of multi-source data collected from the secondary circuit. For example, taking the secondary circuit of Unit #3 in a 300MW thermal power plant as an application scenario, this unit's secondary circuit encompasses the relay protection circuits, control circuits, and signal circuits of key equipment such as generators, main transformers, circuit breakers, and disconnectors. The method described above is used to achieve relay protection safety linkage control. Therefore, the real-time dataset includes relay protection device status parameters, secondary circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters.

[0031] like Figure 2 As shown, to obtain real-time datasets, a multi-source data acquisition system can be built based on the power plant's secondary electrical circuits. This system includes acquisition terminals, transmission modules, and data aggregation units. The acquisition terminals are distributed and connected to control equipment via transmission modules and data aggregation units. During operation, the system can synchronously collect status parameters of relay protection devices, secondary circuit electrical parameters, primary equipment-related status parameters, and environmental interference parameters in the power plant's secondary electrical circuits, forming a real-time dataset.

[0032] Among them, the status parameters of the relay protection device may include the power supply status of the protection device, the on / off status of the trip output circuit, the number of relay actions, the self-test results of the protection device, and the redundant communication status of the dual configuration device, etc.

[0033] For example, relay protection devices include generator differential protection devices, main transformer gas protection devices, circuit breaker failure protection devices, etc. A status monitoring module can be selected to collect the power supply status of each relay protection device, such as 220V DC power supply voltage and current. The on / off status of the trip output circuit can be obtained through auxiliary contact monitoring; the number of relay actions is cumulatively counted with an accuracy of ±1; the self-test results of the protection device include normal codes or abnormal alarm codes; the redundant communication status of the dual-configuration device includes communication link connectivity, data transmission delay, etc., with a collection frequency of once per 100ms.

[0034] The electrical parameters of the secondary circuit can include parameters such as voltage, current, power factor, insulation resistance and circuit harmonic content. Among them, the voltage acquisition range covers DC 220V, 110V and AC 220V, 100V and other voltage levels.

[0035] For example, a high-precision power acquisition module is selected to acquire the voltage of the secondary circuit, namely DC 220V and 110V, AC 220V and 100V, with an accuracy of ±0.5 class; the current is 0-5A, with an accuracy of ±0.5 class; the power factor accuracy is ±0.001; the insulation resistance is 0-1000MΩ, with an accuracy of ±1%; the circuit harmonic content is 2-25th harmonics, with a detection accuracy of ±0.1%; and the acquisition frequency is 1 time / 50ms.

[0036] The associated status parameters of primary equipment include the operating status and position signals of generators, main transformers, circuit breakers, and disconnectors. Furthermore, for primary equipment such as circuit breakers and disconnectors, their status signals can be monitored using dual-position monitoring.

[0037] For example, by connecting to the power plant's SCADA system and equipment position sensors, parameters such as generator speed and load can be collected; parameters such as main transformer oil temperature and winding temperature can be collected; parameters such as circuit breaker closing position and opening position can be collected; parameters such as disconnecting switch closing position and opening position can be collected, and operating status and position signals can be obtained. Among them, the status signals of circuit breaker and disconnecting switch adopt dual position monitoring, that is, dual verification by auxiliary contacts and position sensors, so as to avoid false alarms caused by the failure of a single monitoring point.

[0038] Environmental interference parameters refer to parameters in the power plant environment that can affect the linkage control. Therefore, environmental interference parameters can include the temperature, humidity, electromagnetic interference intensity, and grounding resistance value of the environment in which the secondary circuit is located.

[0039] For example, a temperature and humidity sensor can be used to measure the temperature of the distribution room where the secondary circuit is located. The temperature and humidity sensor has a measurement range of -20℃ to 80℃ and an accuracy of ±0.5℃; the humidity range is 0 to 100%RH and an accuracy of ±3%RH. An electromagnetic interference monitor can be used to measure the electromagnetic interference intensity, with a measurement range of 10kHz to 1GHz and an accuracy of ±1dBμV / m. A grounding resistance tester can be used to measure the grounding resistance value, with a measurement range of 0 to 10Ω and an accuracy of ±0.01Ω. The data acquisition frequency is once per minute.

[0040] All data collected by the acquisition terminals is synchronously transmitted to the data aggregation unit via the transmission module, where it is integrated to form a real-time dataset. To ensure the synchronization of data acquisition, the data transmission delay does not exceed 10ms.

[0041] S102. Obtain an effective dataset by performing hierarchical preprocessing on the real-time dataset.

[0042] After acquiring the real-time dataset, the data can be preprocessed. This involves performing hierarchical preprocessing on the real-time dataset to obtain a valid dataset. During hierarchical preprocessing of the acquired real-time dataset, processes such as outlier removal, data standardization and calibration, and interference signal suppression can be performed sequentially to obtain a valid dataset that meets the requirements for relay protection linkage judgment.

[0043] In some embodiments, to obtain a valid dataset, after acquiring the real-time dataset, raw acquisition data for each parameter can be extracted from the real-time dataset, and the standard deviation of the raw acquisition data can be calculated. Error data in the raw acquisition data is then removed based on the standard deviation. Next, invalid data exceeding the corresponding numerical range of the device's historical operating data threshold is eliminated from the raw acquisition data to obtain valid raw data. Finally, the valid raw data is converted into standardized data within a unified standard range to obtain a valid dataset.

[0044] For example, during stratified preprocessing, outlier data in the real-time dataset can be removed first. This involves calculating the standard deviation σ of various parameters, using the 3σ criterion to identify gross error data in the collected data, and then combining this with historical operating data thresholds from the equipment to remove invalid data that exceeds a reasonable range, retaining only the valid original data.

[0045] The 3σ criterion is used to identify gross error data in the collected data. Reasonable ranges for each parameter can be set based on historical equipment operating data and industry standards. For example, the reasonable range for secondary circuit insulation resistance is ≥1MΩ. When the collected insulation resistance value is <1MΩ or exceeds the error range calculated by the 3σ criterion, it is judged as gross error data and discarded. Simultaneously, combined with historical equipment operating data thresholds, parameters such as voltage and current are subjected to secondary verification to remove invalid data exceeding the equipment's rated operating range and retain valid original data.

[0046] Then, data standardization and calibration are performed, which involves converting different types and magnitudes of collected parameters into standardized data within a unified standard range to obtain an effective dataset, thereby eliminating the influence of units and ensuring the comparability of parameters.

[0047] For example, the min-max standardization method can be used to convert different types and magnitudes of collected parameters into standardized data within the unified standard range of [0, 1], thereby eliminating the influence of dimensions and ensuring that each parameter is comparable and synergistic. For instance, DC 220V voltage can be converted to 1.0, DC 110V voltage to 0.5, and AC 100V voltage to 0.45, making voltage parameters of different levels comparable.

[0048] To improve the data quality of real-time datasets, interference signal suppression can be implemented for multi-source data acquisition systems. This suppression can employ a combination of methods, including isolating high-voltage and low-voltage circuits, single-end grounding of shielded cables, and harmonic filtering. For example, according to the relevant requirements of the "Design Code for Secondary Circuits of Power Systems," high-voltage circuits with a voltage level ≥110V should be laid separately from low-voltage circuits with a voltage level <110V, with a spacing of no less than 30cm. Sensitive circuits such as relay protection trip output circuits can use shielded cables with single-end grounding of the shielding layer and a grounding resistance controlled within 4Ω. Simultaneously, a low-pass filter circuit with a cutoff frequency of 50Hz should be installed at the input end of each acquisition terminal and data aggregation unit to filter out noise signals caused by grid harmonic interference and electromagnetic interference, ensuring the stability of data transmission and processing. After processing, the data interference error can be controlled within ±0.1%.

[0049] S103. Use the relay protection safety linkage judgment model to output the status judgment result based on the valid dataset.

[0050] After obtaining a valid dataset through hierarchical preprocessing, a status judgment can be performed on the valid dataset. During the status judgment process, a relay protection safety linkage judgment model can be used. This relay protection safety linkage judgment model is a dual judgment logic model employing a primary criterion and a backup criterion. The primary criterion is used to determine the initial state by comparing the secondary circuit electrical parameters with preset protection settings; the backup criterion is used to perform collaborative verification based on the initial state, using the relay protection device status parameters and the associated status parameters of the primary equipment.

[0051] By constructing a relay protection safety linkage judgment model, the operating status of the secondary circuit can be identified and judged based on an effective dataset, combined with preset protection settings, circuit interlocking logic, and equipment safety thresholds, so as to output the status judgment result and linkage trigger signal.

[0052] The status judgment results include status levels such as normal operation status, minor abnormal disturbance status, severe abnormal disturbance status, transient fault status, and permanent fault status. The linkage trigger signals are correspondingly divided into early warning signals, adaptive adjustment signals, first-level trip signals, second-level trip signals, backup circuit switching signals, and equipment interlocking signals. The signal transmission adopts the GOOSE protocol to achieve high-speed interaction and ensure the timeliness of linkage response.

[0053] like Figure 3As shown, in order to output the status judgment result, in some embodiments, when using the relay protection safety linkage judgment model to output the status judgment result based on the valid dataset, historical linkage control logs can be obtained first, and preset protection settings can be set according to the historical linkage control logs and environmental interference parameters. Then, the main criterion of the relay protection safety linkage judgment model is set based on the preset protection settings. Then, according to the main criterion, the secondary circuit electrical parameters are extracted from the valid dataset, and the first duration for which the secondary circuit electrical parameters exceed the preset protection settings is recorded. When the first duration reaches the set duration threshold, the initial state is generated.

[0054] Since the relay protection safety linkage judgment model adopts a dual judgment logic of primary and backup criteria, a preliminary judgment can be made based on the primary criteria when performing state judgment. The primary criteria can be based on the comparison between the secondary circuit electrical parameters and the preset protection settings. When the parameters exceed the protection settings and the duration reaches the set threshold, it can be preliminarily determined that there is an abnormal state in the corresponding circuit, that is, an initial state is generated.

[0055] After generating the initial state, backup criteria are used for collaborative verification. That is, when using the relay protection safety linkage judgment model to output the state judgment result based on the valid dataset, the backup criteria of the relay protection safety linkage judgment model can also be invoked according to the initial state. Among them, the backup criteria include a composite criterion applicable to the power drop threshold and voltage rise under zero power conditions.

[0056] Next, based on the backup criteria, the status parameters of the relay protection device and the associated status parameters of the primary equipment are extracted from the valid dataset. Then, the composite judgment parameters are calculated based on the status parameters of the relay protection device and the associated status parameters of the primary equipment. Finally, by recording the second duration during which the composite judgment parameters do not meet the composite criteria, a status judgment result is generated based on the second duration, and a linkage trigger signal is generated based on the status judgment result.

[0057] Backup criteria can be collaboratively verified based on the status parameters of relay protection devices and the associated status parameters of primary equipment. After the main criterion is triggered and the initial judgment indicates that an abnormal state exists in the corresponding circuit, secondary verification can be performed using backup criteria to avoid malfunctions caused by misjudgment of a single parameter. Specifically, for zero-power operation, a composite criterion of power drop threshold and voltage rise is used for identification. When the composite judgment parameter does not meet the composite criterion and the duration exceeds the set threshold, the corresponding judgment logic is triggered, and the status judgment result can be obtained.

[0058] For example, by constructing a relay protection safety linkage judgment model that adopts dual judgment logic of primary and backup criteria, and deploying the model in the edge computing gateway of the data aggregation unit, it is possible to complete the secondary circuit status identification and output linkage trigger signal based on the effective dataset, combined with the preset protection settings, circuit interlocking logic and equipment safety thresholds.

[0059] Therefore, model parameters can be preset first. For example, based on the design parameters and operating requirements of the secondary circuit of the 300MW unit, protection settings, circuit interlocking logic, and equipment safety thresholds can be preset. Specifically, the generator differential protection operating current setting is 1.2 times the rated current, and the main transformer gas protection operating threshold is an oil temperature rise of 10℃ / h. Circuit interlocking logic can include interlocking logic such as requiring the disconnecting switch to operate only after the circuit breaker has tripped. Equipment safety thresholds can include a permissible voltage fluctuation range of ±10% for the relay protection device. Simultaneously, a zero-power condition judgment threshold can be preset, i.e., |P| < 2.00%Pe, where Pe is the rated active power of the unit (300MW), i.e., |P| < 6MW, and the duration is set to 500ms.

[0060] After the model parameters are preset, a dual judgment logic can be executed. During the judgment process, the status is first identified based on the main criterion, that is, based on the comparison between the secondary circuit electrical parameters and the preset protection settings. When a parameter exceeds the protection setting and the duration reaches the set threshold, it is initially judged as the corresponding status. For example, if the secondary circuit current exceeds 1.2 times the rated current and the duration reaches 100ms, the main criterion initially judges it as a fault status.

[0061] Then, status identification is performed based on backup criteria, which involves the collaborative verification of the status parameters of the relay protection device and the associated status parameters of the primary equipment. When the main criterion is triggered, secondary verification is performed through backup criteria to avoid malfunctions caused by misjudgment of a single parameter. For example, if the main criterion initially determines that a fault state is present, the backup criteria verify that the self-test results of the relay protection device are normal, the circuit breaker position signal is abnormal, and the main transformer oil temperature is abnormal, thus confirming that the fault state is real and valid.

[0062] If, after the primary criterion is triggered, the backup criterion verifies that the problem is caused by interference in the acquired data, such as instantaneous voltage fluctuations caused by electromagnetic interference, then it can be determined as a false trigger, and no linkage trigger signal will be output. Similarly, when the unit is in zero-power operation, i.e., |P| < 6MW and the duration exceeds 500ms, a composite criterion of power drop threshold and voltage rise can be used for identification to avoid false linkage under zero-power operation.

[0063] After performing dual judgments, the status judgment results and linkage trigger signals are output. Based on the dual judgment logic, five status judgment results are output: normal operation, minor abnormal disturbance, severe abnormal disturbance, transient fault, and permanent fault. Correspondingly, six linkage trigger signals are output: warning signal, adaptive adjustment signal, first-level trip signal, second-level trip signal, backup circuit switching signal, and equipment interlocking signal. All linkage trigger signals use the GOOSE protocol for high-speed interaction, ensuring timely linkage response with a signal transmission delay not exceeding 5ms.

[0064] S104. Execute the linkage control strategy based on the status judgment result.

[0065] After the status judgment result is output using the relay protection safety linkage judgment model, the linkage control strategy can be determined and executed based on the status judgment result. For example, when an abnormal disturbance state is identified, early warning linkage and parameter adaptive adjustment are initiated. When a fault state is identified, a hierarchical linkage operation is triggered, including relay protection device tripping, backup circuit switching, and related primary equipment interlocking, to ensure rapid fault isolation.

[0066] In some embodiments, when executing a linkage control strategy based on a state judgment result, the state level corresponding to the state judgment result can be obtained first, and a level strategy mapping table can be invoked when the state level is higher than a preset level threshold. The level strategy mapping table includes the mapping relationship between state levels and linkage control strategies. The level strategy mapping table is a pre-defined linkage control strategy for different state levels based on the commissioning results of the power plant's operating state.

[0067] Then, based on the status level, the linkage control policy is queried in the level policy mapping table. This linkage control policy includes the linkage operation object and the linkage operation content. Finally, based on the linkage operation content, a hierarchical linkage operation instruction is executed on the linkage operation object.

[0068] like Figure 4 As shown, when the status judgment result includes five levels: normal operation status, minor abnormal disturbance status, severe abnormal disturbance status, transient fault status, and permanent fault status, the corresponding linkage control strategy can be queried in the level strategy mapping table according to the current status level corresponding to the status judgment result, that is, the linkage operation object and specific linkage operation content under the current status level can be determined.

[0069] When the status judgment result indicates normal operation, the corresponding linkage control strategy is to maintain the current operating parameters of the secondary circuit and perform redundancy checks on the dual-configuration protection devices according to a set cycle. For example, if all parameters are within the normal operating range, it can be determined that the current status judgment result indicates abnormal operation. In this case, the existing operating parameters of the secondary circuit can be maintained, and the data acquisition system continuously monitors data changes in real time without triggering additional linkage operations. Simultaneously, a redundancy check is performed on the dual-configuration protection devices every 24 hours to ensure that the protection devices are in normal operating condition.

[0070] When the status assessment indicates a minor abnormal disturbance, the corresponding linkage control strategy involves activating an audible and visual warning, and adjusting the sensitivity parameters of the protection device via an adaptive adjustment signal. For example, if the secondary circuit voltage fluctuation exceeds ±5% but does not exceed the protection setting, and the electromagnetic interference intensity slightly exceeds the limit, it can be determined as a minor abnormal disturbance. In this case, an audible and visual warning can be activated, causing the power distribution room's audible and visual alarm to operate, and the background monitoring system to display a warning message. Simultaneously, the sensitivity parameters of the secondary circuit protection device are adjusted via an adaptive adjustment signal, such as fine-tuning the protection device's operating threshold by ±5%, to suppress the amplification of the disturbance and prevent the protection device from malfunctioning.

[0071] When the status assessment indicates a severe abnormal disturbance, the corresponding linkage control strategy is to issue an emergency warning and disconnect non-critical loads in the secondary circuit and switch to the backup circuit. For example, if the insulation resistance of the secondary circuit drops to 0.5MΩ and the electromagnetic interference intensity severely exceeds the standard, it is determined to be a severe abnormal disturbance. At this time, an emergency warning can be issued, causing the audible and visual alarms to continue operating, the background monitoring system to issue an emergency alarm, and simultaneously push alarm information to the terminal equipment of the maintenance personnel. Non-critical loads such as backup lighting and auxiliary control circuits in the secondary circuit are immediately disconnected, and automatic backup power switching is initiated, with the switching time controlled within 100ms, to ensure continuous power supply to critical protection circuits such as the generator differential protection circuit and the main transformer gas protection circuit, preventing power loss of protection devices.

[0072] When the status assessment result indicates a transient fault state, the corresponding linkage control strategy is to trigger the protection device to trip instantaneously, automatically reclose the circuit after the fault is cleared, and record the fault data. For example, a transient short circuit in the secondary circuit or a transient overvoltage caused by lightning strikes can be identified as a transient fault state. In this case, the corresponding circuit breaker can be controlled to trip rapidly to trigger the relay protection device to trip instantaneously, and the fault parameters can be monitored in real time through the data acquisition system to confirm whether they have returned to normal. After the fault is cleared, the circuit breaker automatically recloses, and fault data such as the fault occurrence time, fault parameters, and fault duration are recorded and stored in the linkage control log for subsequent model optimization.

[0073] When the status assessment result indicates a permanent fault, the corresponding linkage control strategy is to trigger the protection device to trip continuously, disconnect the upstream and downstream associated circuits of the faulty circuit, and switch to the standby circuit; and to lock out the primary equipment corresponding to the faulty circuit. For example, in the case of a permanent short circuit caused by a damaged secondary circuit cable and a relay protection device failure, the fault is determined to be permanent. In this case, the relay protection device can be permanently tripped, and the upstream and downstream associated circuits of the faulty circuit can be disconnected, i.e., the power supply circuit, control circuit, and other downstream associated circuits of the faulty circuit can be disconnected. Then, the system quickly switches to the standby circuit, with the standby circuit switching time not exceeding 50ms. At the same time, the corresponding primary equipment, such as the circuit breaker and disconnector associated with the faulty circuit, is locked out, achieving both electrical and mechanical locking, preventing misoperation, and avoiding the fault from spreading to other circuits.

[0074] Hierarchical linkage operation commands can be used to implement hierarchical linkage operations, that is, to adopt a progressive control mechanism of fault location, rapid tripping, circuit switching, and equipment interlocking. In some embodiments, when executing hierarchical linkage operation commands on the linkage operation object based on the linkage operation content, the fault location can first be determined based on a valid dataset, and the circuit control switch and circuit switching device associated with the fault location can be obtained. Then, a tripping command is sent to the circuit control switch to cut off the connection status of the electrical equipment associated with the fault location, and a switching command is sent to the circuit switching device to switch to the backup circuit associated with the fault location, thereby realizing equipment interlocking of the faulty equipment corresponding to the fault location.

[0075] S105. Generate linkage control logs by monitoring the execution process of linkage control strategies, and dynamically optimize the relay protection linkage judgment model and linkage control strategies based on the linkage control logs.

[0076] During the execution of the linkage control strategy, linkage control closed-loop optimization can also be performed, that is, by monitoring the execution process of the linkage control strategy to generate linkage control logs, and dynamically optimizing the relay protection linkage judgment model and linkage control strategy based on the linkage control logs.

[0077] During the closed-loop optimization of linkage control, the entire linkage control process can be monitored and recorded to form a linkage control log. Based on the log data, the relay protection linkage judgment model and linkage control strategy can be dynamically optimized to achieve closed-loop control. Therefore, the closed-loop optimization process of linkage control can include linkage control log recording and dynamic optimization.

[0078] For linkage control log recording, in some embodiments, when generating linkage control logs by monitoring the execution process of linkage control strategies, system data can be recorded first. The system data includes at least one of real-time datasets, valid datasets, status judgment results, linkage trigger signals, and linkage operation content of linkage control strategies.

[0079] The process data of the execution of the linkage control strategy is then monitored. This process data includes the operation time of the linkage control strategy and information on changes in equipment operating status during the execution of the linkage control strategy. Then, a linkage control log is generated based on the system data and process data, and stored for a set storage period.

[0080] For example, when recording linkage control logs, system data such as collected data (including real-time datasets and valid datasets before and after preprocessing), status judgment results, linkage trigger signals, and linkage operation content can be recorded. At the same time, process data such as operation time and equipment operating status changes during strategy execution can be monitored, and linkage control logs can be generated according to the pre-set log format.

[0081] The linkage control log can be stored locally and backed up in the cloud, with a retention period of 1-2 years to meet the needs of power plant operation and maintenance and fault tracing. This allows operation and maintenance personnel to query and export log data through the backend monitoring system.

[0082] For the dynamic optimization process, in some embodiments, when dynamically optimizing the relay protection linkage judgment model and linkage control strategy based on the linkage control log, the items to be optimized in the log data can be statistically analyzed. These items include at least one of fault cases and records of invalid actions by protection devices. Fault cases are obtained by analyzing the state judgment results; invalid actions by protection devices include erroneous operation records or failure-to-operate records determined based on changes in equipment operating status.

[0083] Then, the optimization direction is determined based on the statistical frequency of the item to be optimized, and the judgment thresholds corresponding to the main criterion and backup criterion in the relay protection linkage judgment model are adjusted according to the optimization direction, and the action sequence of the linkage control strategy is adjusted according to the item to be optimized.

[0084] For example, to perform dynamic optimization, statistical analysis can be conducted on the linkage control log data every month to extract fault cases, records of malfunctions or failures of protection devices, and to revise the threshold parameters and judgment logic of the relay protection safety linkage judgment model based on this data. If a minor abnormal disturbance triggers an early warning multiple times but does not develop into a fault, the judgment threshold for that disturbance can be adjusted appropriately to reduce the frequency of early warnings. Simultaneously, the timing of the linkage control strategy can be optimized, such as adjusting the timing of backup power supply switching to further shorten the switching time.

[0085] By dynamically optimizing the system, the probability of false tripping and failure to trip of the protection device can be reduced, and the reliability of the protection system can reach the IEC61508SIL-2 standard or above. For example, after optimization, the false tripping rate of the protection device is reduced to less than 0.01 times / year, and the failure to trip rate is reduced to less than 0.005 times / year.

[0086] By applying the technical solutions of the above embodiments, the power plant electrical secondary circuit relay protection safety linkage control method described in the above embodiments can comprehensively cover the status parameters of relay protection devices, circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters by establishing a multi-source data acquisition system, thus solving the problem of incomplete data acquisition. Simultaneously, through layered preprocessing and composite interference suppression methods, abnormal data is eliminated, dimensional influences are removed, and interference signals are filtered, ensuring the accuracy and stability of the acquired data and providing reliable data support for relay protection linkage judgment. The acquisition accuracy rate can reach over 99.9%.

[0087] The method also employs a dual judgment logic of primary and backup criteria. The primary criterion is based on the comparison between electrical parameters and protection settings, while the backup criterion is verified through the collaborative analysis of multiple parameters, which can avoid malfunctions caused by misjudgment of a single parameter. Simultaneously, composite criteria are set for special operating conditions such as zero power, improving the accuracy of state identification. The judgment accuracy rate can reach 99.8%, and after optimization, the false trip rate of the protection device is reduced to below 0.01 times / year, and the failure to trip rate is reduced to below 0.005 times / year, meeting the requirements of IEC61508SIL-2 and above standards.

[0088] The method employs a hierarchical linkage control strategy, executing differentiated linkage operations based on the status levels of circuits, such as normal, minor anomalies, severe anomalies, transient faults, and permanent faults. It utilizes progressive control—including fault location, rapid tripping, circuit switching, and equipment interlocking—ensuring a linkage response time of no more than 50ms and a fault isolation time of no more than 0.5s. This approach avoids excessive linkage that could lead to an expanded system outage while ensuring rapid fault isolation, thus guaranteeing the safe operation of secondary circuits and primary equipment.

[0089] The method records the linkage control log throughout the process and dynamically corrects the judgment model threshold and linkage strategy timing based on the fault cases, false operation records, or failure to operate records in the log data, forming a closed-loop control mechanism of acquisition, judgment, linkage, and optimization. This solves the problems of lack of continuous optimization capability and long-term decline in operating performance, and can adapt to the long-term operating needs of the power plant's secondary circuit, continuously improving the adaptability and reliability of relay protection control.

[0090] The method is widely applicable to various power plants, including thermal, hydropower, and new energy power plants, and is suitable for the secondary circuits of power equipment with voltage levels of 3kV and above. It can be applied to new projects as well as directly adapted to the secondary circuit upgrades of expansion and renovation projects. Simultaneously, it reserves expansion interfaces to facilitate the subsequent addition of data acquisition terminals and expansion of control functions, conforming to standardized design principles and significantly reducing the operation and maintenance costs and upgrade difficulty of power plants.

[0091] It should be noted that the control method described in the above embodiments is adapted to the application scenarios of thermal power plants. If it needs to be applied to hydropower plants or new energy power plants such as photovoltaic and wind power, the acquisition parameters of the multi-source data acquisition system and the threshold parameters of the relay protection linkage judgment model can be adjusted through the reserved expansion interface. For example, the associated status parameter acquisition of photovoltaic modules and wind turbines can be added to new energy power plants without making significant modifications to the overall control logic. If it is applied to the secondary circuit transformation of new construction, expansion, or renovation projects, it can be directly adapted to the secondary circuit of power equipment with voltage levels of 3kV and above. Through the reserved expansion interface, it is convenient to add new acquisition terminals and expand linkage control functions in the future, which conforms to the standardized design principle and reduces the transformation cost.

[0092] In some embodiments, as a refinement and extension of the specific implementation of the above embodiments, and to fully illustrate the specific implementation process of this embodiment, some embodiments of this application also provide a power plant electrical secondary circuit relay protection safety linkage control method. The difference between this method and the above embodiments is that it can perform secondary circuit insulation and grounding linkage monitoring. For example... Figure 5 As shown, the method includes: S201. Real-time acquisition of insulation and grounding data; S202. Obtain the preset insulation resistance value and the grounding resistance setting threshold; S203. When the insulation resistance value is lower than the preset insulation resistance value, or when the grounding resistance value exceeds the grounding resistance set threshold, an insulation warning and grounding circuit check linkage signal is generated.

[0093] When monitoring the linkage between insulation and grounding of secondary circuits, insulation and grounding data can be collected in real time first. This data includes the insulation resistance value and grounding resistance value of the secondary circuit. Then, a preset insulation resistance value and a grounding resistance threshold value are obtained.

[0094] By comparing and analyzing the insulation and grounding data with the preset insulation resistance value and the grounding resistance threshold, an insulation warning and grounding loop check linkage signal is generated when the insulation resistance value is lower than the preset insulation resistance value or the grounding resistance value exceeds the grounding resistance threshold. The grounding loop check linkage signal is used to synchronously lock the protection device output.

[0095] For example, by adding a secondary circuit insulation and grounding linkage monitoring function, it can work in conjunction with a multi-source data acquisition system to collect the insulation resistance and grounding resistance values ​​of the secondary circuit in real time. The preset insulation resistance value is ≥1MΩ, and the grounding resistance threshold is ≤4Ω. When the collected insulation resistance is below 1MΩ or the grounding resistance exceeds 4Ω, an insulation warning is immediately triggered; the background monitoring system displays an insulation alarm notification and pushes the alarm information to maintenance personnel. It can also generate a grounding circuit check linkage signal, synchronously blocking the corresponding protection device output and prohibiting the protection device from tripping to avoid protection failure caused by grounding interference. After maintenance personnel have investigated and resolved the insulation and grounding issues and confirmed that the parameters have returned to normal, the protection device output is unlocked, and normal linkage control is restored.

[0096] By applying the technical solutions of the above embodiments, the power plant electrical secondary circuit relay protection safety linkage control method described in the above embodiments can further improve the relay protection safety system and enhance the safety of secondary circuit operation by adding a secondary circuit insulation and grounding linkage monitoring function, real-time monitoring of insulation resistance and grounding resistance, timely triggering of early warning and blocking of protection device output when parameters exceed the standard, avoiding protection failure caused by grounding interference.

[0097] In some embodiments, as a specific implementation of the power plant electrical secondary circuit relay protection safety linkage control method described in the above embodiments, some embodiments of this application also provide a power plant electrical secondary circuit relay protection safety linkage control system, such as... Figure 6 As shown, the system includes: The multi-source data acquisition module is used to acquire real-time datasets, which are multi-source data collected from the secondary circuit. The real-time datasets include relay protection device status parameters, secondary circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters. The data preprocessing module is used to obtain an effective dataset by performing hierarchical preprocessing on the real-time dataset; The status judgment module is used to output the status judgment result based on the effective dataset using the relay protection safety linkage judgment model. The relay protection safety linkage judgment model is a dual judgment logic model using a primary criterion and a backup criterion. The primary criterion is used to determine the initial state by comparing the electrical parameters of the secondary circuit with the preset protection settings. The backup criterion is used to perform collaborative verification based on the initial state, the status parameters of the relay protection device, and the associated status parameters of the primary equipment. The strategy execution module is used to execute the linkage control strategy based on the state judgment result; The dynamic optimization module is used to generate linkage control logs by monitoring the execution process of the linkage control strategy, and to dynamically optimize the relay protection linkage judgment model and the linkage control strategy based on the linkage control logs.

[0098] By applying the technical solutions of the above embodiments, the power plant electrical secondary circuit relay protection safety linkage control system described in the above embodiments can first acquire real-time datasets collected from the secondary circuits, and obtain effective datasets by performing hierarchical preprocessing on the real-time datasets. Then, the relay protection safety linkage judgment model is used to output state judgment results based on the effective datasets. Then, the linkage control strategy is executed according to the state judgment results. Furthermore, linkage control logs are generated by monitoring the execution process of the linkage control strategy, and the relay protection linkage judgment model and linkage control strategy are dynamically optimized based on the linkage control logs. The system adopts a multi-source data acquisition system, combined with dual judgment logic of primary and backup criteria, which can reduce linkage malfunctions caused by misjudgments of single parameters and improve the accuracy of state identification. The system can also dynamically correct the judgment threshold of the model and the linkage control strategy based on the linkage control logs, improving the reliability of relay protection control.

[0099] It should be noted that other corresponding descriptions of the functional units involved in the power plant electrical secondary circuit relay protection safety linkage control system provided in the embodiments of this application can be found in the corresponding descriptions in the power plant electrical secondary circuit relay protection safety linkage control method provided in the above embodiments, and will not be repeated here.

[0100] This application also provides a computer device, specifically a personal computer, server, network device, etc. The computer device includes a bus, processor, memory, and communication interface, and may also include input / output interfaces and a display device. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the computer device stores location information. The network interface of the computer device is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the various method embodiments.

[0101] Those skilled in the art will understand that the structure of the computer device described above is only a partial structure related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. A specific computer device may include more or fewer components, or combine certain components, or have different component arrangements.

[0102] In one embodiment, a computer-readable storage medium is also provided, which may be non-volatile or volatile, and a computer program is stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0103] In one embodiment, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0104] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0105] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods.

[0106] Any references to memory, database, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc.

[0107] Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can take many forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0108] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchain. The processors involved in the embodiments provided in this application may be, but are not limited to, general-purpose processors, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A method for safety linkage control of relay protection in the secondary electrical circuit of a power plant, characterized in that, The method includes: Acquire a real-time dataset, which is multi-source data collected from the secondary circuit; the real-time dataset includes relay protection device status parameters, secondary circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters. By performing hierarchical preprocessing on the real-time dataset, an effective dataset is obtained; The relay protection safety linkage judgment model is used to output the status judgment result based on the effective dataset. The relay protection safety linkage judgment model is a dual judgment logic model that adopts a primary criterion and a backup criterion. The primary criterion is used to determine the initial state by comparing the electrical parameters of the secondary circuit with the preset protection settings. The backup criterion is used to perform collaborative verification based on the initial state, the status parameters of the relay protection device and the associated status parameters of the primary equipment. Execute the linkage control strategy based on the state judgment result; The linkage control strategy generates linkage control logs by monitoring the execution process of the linkage control strategy, and dynamically optimizes the relay protection linkage judgment model and the linkage control strategy based on the linkage control logs.

2. The method according to claim 1, characterized in that, By performing hierarchical preprocessing on the real-time dataset, an effective dataset is obtained, including: Extract the raw acquisition data for each parameter from the real-time dataset; Calculate the standard deviation of the original collected data; Error data in the original collected data is removed based on the standard deviation. By combining the historical operating data thresholds of the equipment, invalid data that exceeds the corresponding numerical range of the historical operating data thresholds in the original collected data is removed to obtain valid original data; The valid raw data is converted into standardized data within a unified standard range to obtain the valid dataset.

3. The method according to claim 1, characterized in that, Using the relay protection safety linkage judgment model, the status judgment result is output based on the effective dataset, including: Obtain historical linkage control logs, and set the preset protection settings based on the historical linkage control logs and the environmental interference parameters; The main criterion for the relay protection safety linkage judgment model is set based on the preset protection setting value; According to the main criterion, extract the secondary circuit electrical parameters from the valid dataset; Record the first duration during which the electrical parameters of the secondary circuit exceed the preset protection setting; The initial state is generated when the first duration reaches a set duration threshold.

4. The method according to claim 3, characterized in that, Using the relay protection safety linkage judgment model, based on the effective dataset, the output of the status judgment result also includes: The backup criteria of the relay protection safety linkage judgment model are invoked according to the initial state; the backup criteria include a composite criterion applicable to the power drop threshold and voltage rise under zero power conditions; According to the backup criterion, extract the status parameters of the relay protection device and the associated status parameters of the primary equipment from the valid dataset; Calculate composite judgment parameters based on the status parameters of the relay protection device and the associated status parameters of the primary equipment; Record the second duration during which the composite judgment parameter does not satisfy the composite criterion; The state judgment result is generated based on the second duration, and a linkage trigger signal is generated based on the state judgment result.

5. The method according to claim 1, characterized in that, Execute the linkage control strategy based on the state judgment result, including: Obtain the state level corresponding to the state judgment result; When the state level is higher than a preset level threshold, the level policy mapping table is invoked; the level policy mapping table includes the mapping relationship between state levels and linkage control policies; According to the state level, the linkage control strategy is queried in the level strategy mapping table. The linkage control strategy includes the linkage operation object and the linkage operation content. Based on the aforementioned linkage operation content, hierarchical linkage operation instructions are executed on the linkage operation object.

6. The method according to claim 5, characterized in that, The state judgment result is one of the following: normal operation state, minor abnormal disturbance state, severe abnormal disturbance state, transient fault state, and permanent fault state. Execute the linkage control strategy based on the state judgment result, including: When the state judgment result is the normal operating state, the current operating parameters of the secondary circuit are maintained, and the redundancy check of the dual-configuration protection device is performed according to the set period. When the state judgment result is a slight abnormal disturbance, an audible and visual warning is activated, and the sensitivity parameters of the protection device are adjusted through an adaptive adjustment signal; When the state judgment result is a severe abnormal disturbance state, an emergency warning is issued, and non-critical loads in the secondary circuit are disconnected and switched to the backup circuit; When the state judgment result is a momentary fault state, the protection device is triggered to trip momentarily, and automatically recloses after the fault is cleared, and the fault data is recorded. When the status judgment result is a permanent fault state, the protection device is triggered to trip for an extended period, and the upstream and downstream associated circuits of the fault circuit are disconnected and switched to the standby circuit for operation; and the primary equipment corresponding to the fault circuit is blocked.

7. The method according to claim 1, characterized in that, A linkage control log is generated by monitoring the execution process of the linkage control strategy, including: Record system data, the system data including at least one of the real-time dataset, the effective dataset, the status judgment result, the linkage trigger signal, and the linkage operation content of the linkage control strategy; The process data for monitoring the execution of the linkage control strategy includes the operation time of the linkage control strategy and information on changes in the equipment operating status during the execution of the linkage control strategy; The linkage control log is generated based on the system data and the process data; The linkage control log is stored according to the set storage duration.

8. The method according to claim 7, characterized in that, Dynamically optimize the relay protection linkage judgment model and the linkage control strategy based on the linkage control log, including: The items to be optimized in the log data are statistically analyzed. The items to be optimized include at least one of the following: fault cases and records of invalid actions of protection devices. The fault cases are obtained by analyzing the status judgment results. The invalid actions of protection devices include records of erroneous operation or failure to operate determined based on the information on changes in the operating status of the equipment. The optimization direction is determined based on the statistical frequency of the item to be optimized; Adjust the judgment thresholds corresponding to the main criterion and the backup criterion in the relay protection linkage judgment model according to the optimization direction; Adjust the timing of the actions of the linkage control strategy according to the items to be optimized.

9. The method according to claim 1, characterized in that, The method further includes: Real-time acquisition of insulation and grounding data, including the insulation resistance value and grounding resistance value of the secondary circuit; Obtain the preset insulation resistance value and the grounding resistance threshold; When the insulation resistance value is lower than the preset insulation resistance value, or when the grounding resistance value exceeds the grounding resistance set threshold, an insulation warning and grounding circuit check linkage signal is generated; the grounding circuit check linkage signal is used to synchronously lock the protection device output.

10. A power plant electrical secondary circuit relay protection safety linkage control system, characterized in that, The system is applied to the method according to any one of claims 1-9; the system comprises: The multi-source data acquisition module is used to acquire real-time datasets, which are multi-source data collected from the secondary circuit. The real-time datasets include relay protection device status parameters, secondary circuit electrical parameters, primary equipment associated status parameters, and environmental interference parameters. The data preprocessing module is used to obtain an effective dataset by performing hierarchical preprocessing on the real-time dataset; The status judgment module is used to output the status judgment result based on the effective dataset using the relay protection safety linkage judgment model. The relay protection safety linkage judgment model is a dual judgment logic model using a primary criterion and a backup criterion. The primary criterion is used to determine the initial state by comparing the electrical parameters of the secondary circuit with the preset protection settings. The backup criterion is used to perform collaborative verification based on the initial state, the status parameters of the relay protection device, and the associated status parameters of the primary equipment. The strategy execution module is used to execute the linkage control strategy based on the state judgment result; The dynamic optimization module is used to generate linkage control logs by monitoring the execution process of the linkage control strategy, and to dynamically optimize the relay protection linkage judgment model and the linkage control strategy based on the linkage control logs.

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