State control method and system for station service power supply during maintenance period of high-temperature gas cooled reactor

Abstract

The invention belongs to the technical field of electric power safety, and particularly relates to a station service power supply state control method and system in the maintenance period of a high-temperature gas cooled reactor. The invention discloses a method for controlling the state of a station service power supply during the maintenance of a high-temperature gas cooled reactor, and the method comprises the steps: determining station service power supply equipment which needs to be stopped during the maintenance according to a maintenance plan, and determining the lowest availability index of the station service power supply during the maintenance according to the requirements of a modular high-temperature gas cooled reactor operation technical specification; establishing a state management and control model SCM of the station service power supply, and performing state analysis on each working window during the maintenance period; according to a state analysis result, a state management and control scheme of the station service power supply is formulated; and executing the state management and control scheme of the station service power supply, monitoring the operation state of the station service power supply in real time, and recording the state change of the station service power supply. According to the invention, the stability and safety of the auxiliary power supply during the maintenance period are improved, the risk of power supply failure is reduced, and the reliability of the whole power supply system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant engineering, and in particular relates to a method and system for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor. Background Art

[0002] The power system of the modular high-temperature gas-cooled reactor is divided into an off-site power system and a plant power system, of which the plant power system is divided into a normal plant power system and an emergency power system. The emergency power system consists of an emergency AC power system, a DC power system, and an AC uninterruptible power system. During the power operation of the power plant, the entire plant power system should be kept in normal working condition. During the shutdown and maintenance period (major or minor repairs), the reliability of the plant power supply should be improved as much as possible.

[0003] According to the requirements of the technical specifications for the operation of modular high-temperature gas-cooled reactors, the following conditions must be met during the shutdown and maintenance period: the control principles and methods of the high-temperature gas-cooled reactor plant power supply during major and minor repairs are clarified; the unavailability time of the high-temperature gas-cooled reactor plant power supply during major and minor repairs of the units is reduced, thereby ensuring the safe operation of the high-temperature gas-cooled reactor units.

[0004] During the shutdown and maintenance period, the maintenance operations are wide-ranging and the degree of cross-operation is deep. In order to ensure the safety of the plant's power supply, the work involving the plant's power supply must be carefully sorted out and deployed to ensure the safety and reliability of the plant's power supply. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by the present invention is: how to solve the stability and reliability problems of the plant power supply during the maintenance of the high-temperature gas-cooled reactor; how to optimize the efficiency of the maintenance work, reduce downtime, and improve the overall operating efficiency of the nuclear power plant.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: according to the maintenance plan, determine the plant power supply equipment that needs to be shut down during the maintenance period, and according to the requirements of the modular high-temperature gas-cooled reactor operation technical specification, determine the minimum availability index of the plant power supply during the maintenance period;

[0008] According to the number, type and location of the outage equipment, the plant power supply status control model SCM is established to conduct status analysis on each working window during the maintenance period;

[0009] According to the results of the status analysis, formulate a status control plan for the plant power supply, including the plant power supply configuration of each working window, the shutdown sequence and recovery sequence of the shut-down equipment, the maintenance plan and emergency measures for the shut-down equipment;

[0010] Implement the status control plan for the factory power supply, monitor the operating status of the factory power supply in real time, and record the status changes of the factory power supply.

[0011] As a preferred solution of the plant power supply state control method during the maintenance of a high-temperature gas-cooled reactor described in the present invention, the plant power supply equipment includes a plant working power supply, a plant standby power supply, a diesel generator, an emergency AC power system, a DC power system and an AC uninterruptible power system;

[0012] The requirements of the technical specification for the operation of the modular high-temperature gas-cooled reactor include that at least one plant working power supply or plant backup power supply can be operated, at least one diesel generator can be operated, and at least one required emergency AC and DC important bus distribution subsystem can be operated.

[0013] As a preferred solution of the method for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor described in the present invention, wherein: the state control model SCM includes a state transfer matrix and a state evaluation function;

[0014] The state transfer matrix is ​​expressed as,

[0015]

[0016] Among them, p ij represents the probability of transitioning from state i to state j, and n represents the size of the state space, that is, the number of all possible plant power configurations;

[0017] The state evaluation function is:

[0018]

[0019] Among them, A i is the availability index of the plant power supply in state i, and T is the minimum availability threshold specified in the technical specification.

[0020] As a preferred solution of the method for controlling the state of the plant power supply during the overhaul of a high-temperature gas-cooled reactor according to the present invention, the state analysis of each working window during the overhaul period includes determining the start time and end time of each working window, as well as the shutdown equipment involved therein;

[0021] According to the start time and end time, calculate the duration of the working window, recorded as Δt;

[0022] According to the state transfer matrix P, the state transfer probability matrix Q during the working window is calculated, which is expressed as:

[0023] Q=P Δt

[0024] Among them, P Δtrepresents the Δt-th power of the matrix P;

[0025] Determine the initial state vector at the beginning of the working window It is expressed as,

[0026]

[0027] Where i represents the initial state index;

[0028] Compute the state probability distribution at the end of the working window It is expressed as,

[0029]

[0030] in, represents the probability distribution vector, Represents the unit vector corresponding to the initial state s0;

[0031] According to the state evaluation function, the plant power availability index at the end of the working window is calculated and expressed as:

[0032]

[0033] Among them, A represents the availability index of the factory power supply, represents the probability of ending in state i.

[0034] As a preferred solution of the method for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor described in the present invention, wherein: the formulation of the state control plan for the plant power supply includes judging whether the plant power supply availability index A meets the requirements of the operation technical specification, and if so, stopping the analysis and calculation;

[0035] If it is not satisfied, adjust the time of the working window, change the state transition probability matrix Q, and recalculate the plant power supply availability index A. If it is still not satisfied, adjust the order of the working windows, change the shutdown order or recovery order of the shutdown equipment, set the plant power supply configuration at the beginning of the working window, redefine the initial state s0, and recalculate the plant power supply availability index A. If it is still not satisfied, adjust the content of the working window, increase or decrease the number or type of shutdown equipment, set the size or structure of the state space, re-establish the plant power supply state control model SCM, and calculate the plant power supply availability index A until the requirements of the operation technical specification are met;

[0036] The execution of the plant power supply status control plan includes executing the plant power supply status control plan of each working window in sequence according to the plant power supply status control flow chart and the maintenance plan, that is, shutting down or restoring the corresponding plant power supply equipment according to the predetermined shutdown sequence and restoration sequence, and executing the maintenance plan of the corresponding shut-down equipment at the same time.

[0037] As a preferred solution of the plant power supply state control method during the overhaul of a high-temperature gas-cooled reactor described in the present invention, wherein: the real-time monitoring of the operating state of the plant power supply includes collecting operating data of each plant power supply device, including voltage, current, frequency, power and temperature, constructing an evaluation matrix, substituting the operating data into a state evaluation model to calculate a current state score vector;

[0038] Based on the current state score vector and historical data, a state prediction model is used to predict the state;

[0039] The evaluation matrix is ​​expressed as,

[0040]

[0041] Among them, r ij represents the weight of the i-th evaluation index on the j-th operating parameter;

[0042] The state assessment model is expressed as,

[0043]

[0044] Among them, S i represents the score of the i-th evaluation indicator, x j represents the monitoring value of the jth operating parameter;

[0045] The state prediction model is expressed as:

[0046]

[0047] in, represents the predicted score at the tth moment, and a is the smoothing coefficient.

[0048] As a preferred solution of the method for controlling the state of the power supply during the overhaul of a high-temperature gas-cooled reactor described in the present invention, the threshold value T is determined based on historical data. i , if S i ≤T i and It is judged as normal state. If T i i ≤2T i or It is judged as a warning state, S i >2T i or Determined to be a dangerous state;

[0049] When it is judged to be in normal state, the operating parameters are monitored at the standard frequency, all operating data and evaluation results are recorded, and the historical database is updated;

[0050] ​When it is judged to be in warning state, the monitoring frequency will be doubled to capture the changes in the equipment operation state in real time and analyze them. If the equipment operation parameters are found to fluctuate or show abnormal trends, the equipment in warning state will be checked to confirm whether there are potential problems. The inspection includes equipment connection, insulation condition, and temperature abnormality. During the inspection, if the equipment connection is found to be loose or damaged, it will be repaired immediately. If the insulation condition is poor, the insulation material will be replaced. If the temperature rises abnormally, check whether the cooling system is working properly. After the inspection is completed, re-evaluate the equipment operation state. If the equipment load is found to be higher than the threshold, optimize the load distribution and transfer part of the load to other backup equipment to reduce the operating pressure of the equipment in warning state. If the equipment operation parameters have not returned to normal after optimizing the load distribution, some backup power supply equipment will be enabled in advance to further reduce the load of the main equipment. After enabling the backup power supply equipment, continue to monitor the equipment operation state. If it still has not returned to normal, it will be upgraded to a dangerous state and handled as a dangerous state.

[0051] When it is determined to be in a dangerous state, immediately isolate the equipment in the dangerous state and stop its operation to prevent the fault from expanding. Perform a comprehensive inspection of the equipment, determine the fault point and repair it. Start the backup power supply equipment, test the equipment after the repair is completed, and restore the equipment to normal operation after confirming that it has resumed normal operation.

[0052] Another object of the present invention is to provide a system for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor, which can solve the technical problem of maintaining stable operation of the plant power supply during the overhaul of a high-temperature gas-cooled reactor by establishing a state control model, formulating and executing a detailed state control plan, and real-time monitoring and adjusting the state of the plant power supply.

[0053] In order to solve the above technical problems, the present invention provides the following technical solutions: a plant power supply state control system during the overhaul of a high-temperature gas-cooled reactor, comprising an overhaul plan module, a state control model SCM establishment module, a state control plan formulation module, an execution and monitoring module, a state evaluation and adjustment module, a maintenance plan formulation module, an emergency measures formulation module, and a real-time monitoring and evaluation module;

[0054] The maintenance plan module is used to determine which plant power supply equipment needs to be shut down according to the scheduled maintenance activities, and ensure that the power supply configuration during the maintenance period meets the minimum availability requirements;

[0055] The state control model SCM establishment module is used to establish a state control model according to the number, type and location of the outage equipment, and to help predict and evaluate the plant power supply status under different configurations by performing state analysis on each working window during the maintenance period;

[0056] The state control plan formulation module is used to formulate a state control plan for the plant power supply based on the results of the state analysis, including plant power supply configuration, equipment shutdown and recovery sequence, maintenance plan and emergency measures;

[0057] The execution and monitoring module is used to implement the status control plan and monitor the operating status of the factory power supply in real time to ensure the effective execution of the plan and record any status changes;

[0058] The state evaluation and adjustment module is used to determine the start and end time of each working window, calculate the duration, and evaluate the availability of the plant power supply according to the state transition probability matrix, and adjust the time, sequence or content of the working window;

[0059] The maintenance plan formulation module is used to formulate a detailed maintenance plan according to the maintenance requirements of the plant power supply equipment, including personnel, tools, materials, time and steps;

[0060] The emergency measures formulation module is used to analyze various possible power failures and consequences and formulate corresponding emergency measures, including emergency signals, instructions, operations and resource allocation;

[0061] The real-time monitoring and evaluation module is used to collect operating data using the factory power supply monitoring system, identify, evaluate and predict the status, help determine whether the operating status of the power supply is normal, and take emergency measures when necessary.

[0062] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of a method for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor are implemented.

[0063] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor.

[0064] Beneficial effects of the present invention: A method for controlling the state of a plant power supply during the overhaul of a high-temperature gas-cooled reactor provided by the present invention uses a state control model SCM and a real-time monitoring system to comprehensively grasp the operating state of the power supply equipment, prevent potential failures, and significantly improve the stability and safety of the power supply. The state transfer matrix and the state evaluation function evaluate the system status in real time, handle abnormalities in a timely manner, and reduce the risk of failure. By increasing the monitoring frequency and key inspections, the equipment operating parameters are carefully monitored to discover and solve problems in advance. Optimize load distribution and enable backup power supply equipment to reduce the load on major equipment and prevent overload failures. Regularly calibrate and maintain the monitoring system to ensure data accuracy and provide support for evaluation and prediction. In an emergency, initiate emergency plans and remote support, respond quickly, and improve system reliability. Reduce downtime by reasonably arranging the shutdown sequence and recovery sequence. Real-time monitoring and state evaluation enable flexible adjustment of maintenance plans, improve maintenance efficiency and the overall operating efficiency of nuclear power plants, save maintenance and operating costs, and ensure safe, stable, and efficient operation of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0066] Figure 1 A flow chart of a method for controlling the state of a plant power supply during maintenance of a high-temperature gas-cooled reactor is provided as an embodiment of the present invention.

[0067] Figure 2 A structural diagram of a plant power supply status control system during maintenance of a high-temperature gas-cooled reactor provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0069] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0070] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0071] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0072] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Example 1, reference Figure 1 , which is an embodiment of the present invention, provides a method for controlling the state of a plant power supply during maintenance of a high-temperature gas-cooled reactor, comprising:

[0075] According to the maintenance plan, determine the plant power supply equipment that needs to be shut down during the maintenance period, and according to the requirements of the modular high-temperature gas-cooled reactor operation technical specifications, determine the minimum availability index of the plant power supply during the maintenance period;

[0076] According to the number, type and location of the outage equipment, the plant power supply status control model SCM is established to conduct status analysis on each working window during the maintenance period;

[0077] According to the results of the status analysis, formulate a status control plan for the plant power supply, including the plant power supply configuration of each working window, the shutdown sequence and recovery sequence of the shut-down equipment, the maintenance plan and emergency measures for the shut-down equipment;

[0078] Implement the status control plan for the factory power supply, monitor the operating status of the factory power supply in real time, and record the status changes of the factory power supply.

[0079] The plant power supply equipment includes plant working power supply, plant standby power supply, diesel generator, emergency AC power system, DC power system and AC uninterruptible power system;

[0080] The requirements of the technical specification for the operation of the modular high-temperature gas-cooled reactor include that at least one plant working power supply or plant backup power supply can be operated, at least one diesel generator can be operated, and at least one required emergency AC and DC important bus distribution subsystem can be operated.

[0081] The state control model SCM includes a state transfer matrix and a state evaluation function;

[0082] The state transfer matrix is ​​expressed as,

[0083]

[0084] Among them, p ij represents the probability of transitioning from state i to state j, and n represents the size of the state space, that is, the number of all possible plant power configurations;

[0085] The state evaluation function is:

[0086]

[0087] Among them, A i is the availability index of the plant power supply in state i, and T is the minimum availability threshold specified in the technical specification.

[0088] The state analysis of each working window during the maintenance period includes determining the start time and end time of each working window, as well as the outage equipment involved;

[0089] According to the start time and end time, calculate the duration of the working window, recorded as Δt;

[0090] According to the state transfer matrix P, the state transfer probability matrix Q during the working window is calculated, which is expressed as:

[0091] Q=P Δt

[0092] Among them, P Δt represents the Δt-th power of the matrix P;

[0093] Determine the initial state vector at the beginning of the working window It is expressed as,

[0094]

[0095] Where i represents the initial state index;

[0096] Calculate the state probability distribution at the end of the working window It is expressed as,

[0097]

[0098] in, represents the probability distribution vector, Represents the unit vector corresponding to the initial state s0;

[0099] According to the state evaluation function, the plant power availability index at the end of the working window is calculated and expressed as:

[0100]

[0101] Among them, A represents the availability index of the factory power supply, represents the probability of ending in state i.

[0102] The initial state direction at the beginning of the current working window is determined based on historical data, including the first eigenvector, the second eigenvector, and the third eigenvector, which are expressed as:

[0103]

[0104] The formulating of the plant power supply status control plan includes determining whether the plant power supply availability index A meets the requirements of the operation technical specification, and if so, stopping the analysis and calculation;

[0105] If it is not satisfied, adjust the time of the working window, change the state transition probability matrix Q, and recalculate the plant power supply availability index A. If it is still not satisfied, adjust the order of the working windows, change the shutdown order or recovery order of the shutdown equipment, set the plant power supply configuration at the beginning of the working window, redefine the initial state s0, and recalculate the plant power supply availability index A. If it is still not satisfied, adjust the content of the working window, increase or decrease the number or type of shutdown equipment, set the size or structure of the state space, re-establish the plant power supply state control model SCM, and calculate the plant power supply availability index A until the requirements of the operation technical specification are met;

[0106] The purpose of formulating a status control plan for plant power supply is to ensure the basic stability and availability of the plant power supply system during maintenance. Through preliminary status analysis and adjustment, potential problems can be identified and solved in advance, and detailed shutdown and recovery plans can be formulated to optimize the maintenance process. Specifically, by establishing a status control model and a real-time monitoring system, it is ensured that the operating indicators of all plant power supply equipment meet the minimum availability requirements, prevent major failures in the early stage, and ensure the smooth progress of maintenance work.

[0107] Through reasonable planning and dynamic adjustment, potential problems can be solved in advance, risks in the initial maintenance process can be reduced, and stable equipment operation can be ensured. At the same time, through detailed status analysis and reasonable maintenance arrangements, unnecessary downtime can be reduced and the efficiency of maintenance work can be improved. After the initial adjustment, the system stability has been significantly improved, laying a solid foundation for the smooth implementation of subsequent maintenance work.

[0108] Through detailed preliminary analysis and adjustments, the stability and reliability of the system during the maintenance period were ensured, avoiding unexpected problems caused by insufficient initial planning. The optimized maintenance plan not only improved the efficiency of the maintenance work, but also reduced the interference with the normal operation of the nuclear power plant, providing a guarantee for the safe and stable operation of the nuclear power plant.

[0109] The execution of the plant power supply status control plan includes executing the plant power supply status control plan of each working window in sequence according to the plant power supply status control flow chart and the maintenance plan, that is, shutting down or restoring the corresponding plant power supply equipment according to the predetermined shutdown sequence and restoration sequence, and executing the maintenance plan of the corresponding shut-down equipment at the same time.

[0110] The real-time monitoring of the operating status of the plant power supply includes collecting the operating data of each plant power supply device, including voltage, current, frequency, power and temperature, constructing an evaluation matrix, and substituting the operating data into a state evaluation model to calculate a current state score vector;

[0111] Based on the current state score vector and historical data, a state prediction model is used to predict the state;

[0112] The evaluation matrix is ​​expressed as,

[0113]

[0114] Among them, r ij represents the weight of the i-th evaluation index to the j-th operating parameter;

[0115] The state assessment model is expressed as,

[0116]

[0117] Among them, S i represents the score of the i-th evaluation indicator, x j represents the monitoring value of the jth operating parameter;

[0118] The state prediction model is expressed as:

[0119]

[0120] in, represents the predicted score at the tth moment, and a is the smoothing coefficient.

[0121] Determine threshold T based on historical data i , if S i ≤T i and It is judged as normal state. If T i i ≤2T i or It is judged as a warning state, S i >2T i or Determined to be a dangerous state;

[0122] When it is judged to be in normal state, the operating parameters are monitored at the standard frequency, all operating data and evaluation results are recorded, and the historical database is updated;

[0123] When it is judged to be in warning state, the monitoring frequency will be doubled to capture the changes in the equipment operation state in real time and analyze them. If the equipment operation parameters are found to fluctuate or show abnormal trends, the equipment in warning state will be checked to confirm whether there are potential problems. The inspection includes equipment connection, insulation condition, and temperature abnormality. During the inspection, if the equipment connection is found to be loose or damaged, it will be repaired immediately. If the insulation condition is poor, the insulation material will be replaced. If the temperature rises abnormally, check whether the cooling system is working properly. After the inspection is completed, re-evaluate the equipment operation state. If the equipment load is found to be higher than the threshold, optimize the load distribution and transfer part of the load to other backup equipment to reduce the operating pressure of the equipment in warning state. If the equipment operation parameters have not returned to normal after optimizing the load distribution, some backup power supply equipment will be enabled in advance to further reduce the load of the main equipment. After enabling the backup power supply equipment, continue to monitor the equipment operation state. If it still has not returned to normal, it will be upgraded to a dangerous state and handled as a dangerous state.

[0124] When it is determined to be in a dangerous state, immediately isolate the equipment in the dangerous state and stop its operation to prevent the fault from expanding. Perform a comprehensive inspection of the equipment, determine the fault point and repair it. Start the backup power supply equipment, test the equipment after the repair is completed, and restore the equipment to normal operation after confirming that it has resumed normal operation.

[0125] ​On the basis of formulating the state control plan for the plant power supply, real-time monitoring and dynamic prediction are further used to ensure the continuous stability of the plant power supply system in actual operation. By real-time monitoring of the operating status of the equipment, dynamic prediction of the future status of the equipment, timely detection and handling of abnormalities and potential faults that may occur during operation, detailed adjustments and protection are provided to ensure that the system always maintains the best operating state during maintenance. Through dynamic monitoring and rapid response, small faults in equipment operation can be discovered and handled in time to prevent them from developing into major problems. Real-time adjustment and optimization improve the system operation efficiency and reduce the impact of sudden faults on system operation. Through refined management and adjustment, the plant power supply system is ensured to operate stably and reliably throughout the maintenance period, further improving the overall operation efficiency of the nuclear power plant. Through real-time state prediction and dynamic response technology, the intelligent and automated operation of the system is realized.

[0126] Embodiment 2, the second embodiment of the present invention, is different from the previous embodiment in that:

[0127] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0128] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0129] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0130] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0131] Example 3, reference Figure 2 , which is the third embodiment of the present invention, and which provides a plant power supply state control system during the overhaul of a high-temperature gas-cooled reactor, including an overhaul plan module, a state control model SCM establishment module, a state control plan formulation module, an execution and monitoring module, a state evaluation and adjustment module, a maintenance plan formulation module, an emergency measures formulation module, and a real-time monitoring and evaluation module;

[0132] The maintenance plan module is used to determine which plant power supply equipment needs to be shut down according to the scheduled maintenance activities, and ensure that the power supply configuration during the maintenance period meets the minimum availability requirements;

[0133] The state control model SCM establishment module is used to establish a state control model according to the number, type and location of the outage equipment, and to help predict and evaluate the plant power supply status under different configurations by performing state analysis on each working window during the maintenance period;

[0134] The state control plan formulation module is used to formulate a state control plan for the plant power supply based on the results of the state analysis, including plant power supply configuration, equipment shutdown and recovery sequence, maintenance plan and emergency measures;

[0135] The execution and monitoring module is used to implement the status control plan and monitor the operating status of the factory power supply in real time to ensure the effective execution of the plan and record any status changes;

[0136] The state evaluation and adjustment module is used to determine the start and end time of each working window, calculate the duration, and evaluate the availability of the plant power supply according to the state transition probability matrix, and adjust the time, sequence or content of the working window;

[0137] The maintenance plan formulation module is used to formulate a detailed maintenance plan according to the maintenance requirements of the plant power supply equipment, including personnel, tools, materials, time and steps;

[0138] The emergency measures formulation module is used to analyze various possible power failures and consequences and formulate corresponding emergency measures, including emergency signals, instructions, operations and resource allocation;

[0139] The real-time monitoring and evaluation module is used to collect operating data using the factory power supply monitoring system, identify, evaluate and predict the status, help determine whether the operating status of the power supply is normal, and take emergency measures when necessary.

[0140] Embodiment 4, the fourth embodiment of the present invention, provides a method for controlling the state of a plant power supply during maintenance of a high-temperature gas-cooled reactor.

[0141] This embodiment compares the method with the existing technical solutions. The existing technical solutions mainly rely on traditional periodic maintenance and manual monitoring methods, lacking a systematic state control model and real-time monitoring system. Including: stopping equipment for inspection and maintenance according to a predetermined period. Relying on the experience and on-site inspection of maintenance personnel.

[0142] The method of the present invention conducts comprehensive state analysis and dynamic adjustment by establishing a state control model SCM and a real-time monitoring system. The experimental results are shown in Table 1.

[0143] Table 1 Comparison of experimental results

[0144] project Method of the present invention Existing technical solutions Factory power supply failure rate (%) 0.5 2 Unexpected power outages 1 4 Average recovery time (hours) 1.5 3 Number of security breaches 0 2 Average maintenance time (days) 10 15 Maintenance cost (ten thousand yuan) 80 100 Subsequent operation failure rate (%) 0.7 2.5 Maintenance staff satisfaction (out of 5 points) 4.5 3

[0145] Existing technical solutions mainly rely on regular maintenance and manual monitoring, lacking systematic status management and real-time monitoring. This method relies on the experience and on-site inspections of maintenance personnel, has a low monitoring frequency, and cannot capture abnormalities in equipment operation in a timely manner, resulting in a high failure rate and more unexpected power outages. In addition, the existing solutions lack a complete emergency plan, have a slow response speed in the face of sudden failures, and have a long recovery time, posing certain safety risks.

[0146] The existing technical solutions rely on regular maintenance and manual monitoring, which makes the maintenance process time-consuming and costly. The lack of systematic status analysis and dynamic adjustment leads to less than optimal maintenance plans, and frequent failures and downtime increase maintenance costs and time. The maintenance personnel have high workload, low efficiency, and low satisfaction.

[0147] The present invention realizes comprehensive and detailed management of the factory power supply system by establishing a state control model and a real-time monitoring system. Through the state transfer matrix and the state evaluation function, the equipment operation status is finely managed to identify and solve potential problems in advance. Real-time monitoring and dynamic prediction can timely detect and handle abnormalities in operation, significantly reducing the occurrence of unexpected power outages. Detailed emergency plans and rapid startup measures for backup power supplies greatly shorten the recovery time. In addition, through real-time monitoring and state evaluation, safety hazards are timely discovered and handled to ensure the safety of operations.

[0148] The method of the present invention significantly improves the stability and safety of the plant power supply system, reduces the frequency of faults and the number of unexpected power outages. By timely responding to and handling abnormal situations, the operating risk is reduced and the continuity of power supply is improved. The significant advantages in safety management further reduce operational risks and ensure the safe operation of nuclear power plants during maintenance.

[0149] The present invention significantly optimizes the maintenance process through the application of state control models and real-time monitoring systems. Detailed state analysis and reasonable maintenance plans reduce unnecessary downtime and maintenance costs. Real-time monitoring and dynamic prediction effectively prevent small faults from developing into big problems, ensuring the long-term operation stability of the equipment. Intelligent management and convenient operation improve the efficiency and convenience of maintenance work and enhance the satisfaction of maintenance personnel.

[0150] The method of the present invention significantly reduces maintenance time and cost and improves the efficiency of maintenance work. The optimized maintenance plan and dynamic adjustment reduce downtime and improve the overall operating efficiency of the nuclear power plant. Through real-time monitoring and intelligent management, maintenance work is more convenient and efficient, which improves the satisfaction and work enthusiasm of maintenance personnel. The stability of subsequent operation is significantly improved, reducing the risk of failure in long-term operation.

[0151] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be covered by the scope of the claims of the present invention.

Claims

1. A method for controlling the state of a plant power supply during maintenance of a high-temperature gas-cooled reactor, characterized in that: include: According to the maintenance plan, determine the plant power supply equipment that needs to be shut down during the maintenance period, and according to the requirements of the modular high-temperature gas-cooled reactor operation technical specifications, determine the minimum availability index of the plant power supply during the maintenance period; According to the number, type and location of the outage equipment, the plant power supply status control model SCM is established to conduct status analysis on each working window during the maintenance period; According to the results of the status analysis, formulate a status control plan for the plant power supply, including the plant power supply configuration of each working window, the shutdown sequence and recovery sequence of the shut-down equipment, the maintenance plan and emergency measures for the shut-down equipment; Implement the status control plan for the factory power supply, monitor the operating status of the factory power supply in real time, and record the status changes of the factory power supply.

2. A method for controlling the state of a power supply during maintenance of a high temperature gas-cooled reactor according to claim 1, characterized in that: The plant power supply equipment includes plant working power supply, plant standby power supply, diesel generator, emergency AC power system, DC power system and AC uninterruptible power system; The requirements of the technical specification for the operation of the modular high-temperature gas-cooled reactor include that at least one plant working power supply or plant backup power supply can be operated, at least one diesel generator can be operated, and at least one required emergency AC and DC important bus distribution subsystem can be operated.

3. A method for controlling the state of a power supply during maintenance of a high temperature gas-cooled reactor according to claim 2, characterized in that: The state control model SCM includes a state transfer matrix and a state evaluation function; The state transfer matrix is ​​expressed as, Among them, p ij represents the probability of transitioning from state i to state j, and n represents the size of the state space, that is, the number of all possible plant power configurations; The state evaluation function is: Among them, A i is the availability index of the plant power supply in state i, and T is the minimum availability threshold specified in the technical specification.

4. A method for controlling the state of a power supply during maintenance of a high temperature gas-cooled reactor according to claim 3, characterized in that: The state analysis of each working window during the maintenance period includes determining the start time and end time of each working window, as well as the outage equipment involved; According to the start time and end time, calculate the duration of the working window, recorded as Δt; According to the state transfer matrix P, the state transfer probability matrix Q during the working window is calculated, which is expressed as: Q=P Δt Among them, P Δt represents the Δt-th power of the matrix P; Determine the initial state vector at the beginning of the working window It is expressed as, Where i represents the initial state index; Compute the state probability distribution at the end of the working window It is expressed as, in, represents the probability distribution vector, Represents the unit vector corresponding to the initial state s0; According to the state evaluation function, the plant power availability index at the end of the working window is calculated and expressed as: Among them, A represents the availability index of the factory power supply, represents the probability of ending in state i.

5. A method for controlling the state of a power supply during maintenance of a high temperature gas-cooled reactor according to claim 4, characterized in that: The formulating of the plant power supply status control plan includes determining whether the plant power supply availability index A meets the requirements of the operation technical specification, and if so, stopping the analysis and calculation; If it is not satisfied, adjust the time of the working window, change the state transition probability matrix Q, and recalculate the plant power supply availability index A. If it is still not satisfied, adjust the order of the working windows, change the shutdown order or recovery order of the shutdown equipment, set the plant power supply configuration at the beginning of the working window, redefine the initial state s0, and recalculate the plant power supply availability index A. If it is still not satisfied, adjust the content of the working window, increase or decrease the number or type of shutdown equipment, set the size or structure of the state space, re-establish the plant power supply state control model SCM, and calculate the plant power supply availability index A until the requirements of the operation technical specification are met; The execution of the plant power supply status control plan includes executing the plant power supply status control plan of each working window in sequence according to the plant power supply status control flow chart and the maintenance plan, that is, shutting down or restoring the corresponding plant power supply equipment according to the predetermined shutdown sequence and restoration sequence, and executing the maintenance plan of the corresponding shut-down equipment at the same time.

6. A method for controlling the state of a power supply during maintenance of a high temperature gas-cooled reactor according to claim 5, characterized in that: The real-time monitoring of the operating status of the plant power supply includes collecting the operating data of each plant power supply device, including voltage, current, frequency, power and temperature, constructing an evaluation matrix, and substituting the operating data into a state evaluation model to calculate a current state score vector; Based on the current state score vector and historical data, a state prediction model is used to predict the state; The evaluation matrix is ​​expressed as, Among them, r ij represents the weight of the i-th evaluation index to the j-th operating parameter; The state assessment model is expressed as, Among them, S i represents the score of the i-th evaluation indicator, x j represents the monitoring value of the jth operating parameter; The state prediction model is expressed as: in, represents the predicted score at the tth moment, and a is the smoothing coefficient.

7. A method for controlling the state of a power supply during maintenance of a high temperature gas-cooled reactor according to claim 6, characterized in that: Determine threshold T based on historical data i , if S i ≤T i and It is judged as normal state. If T i i ≤2T i or It is judged as a warning state, S i >2T i or Determined to be a dangerous state;​ When it is judged to be in normal state, the operating parameters are monitored at the standard frequency, all operating data and evaluation results are recorded, and the historical database is updated; When it is judged to be in warning state, the monitoring frequency is doubled to capture the changes in the equipment operation state in real time and analyze them. If fluctuations or abnormal trends are found in the equipment operation parameters, the equipment in the warning state is checked to confirm whether there are potential problems, including equipment connection, insulation condition, and temperature abnormalities; During the inspection, if the equipment connection is found to be loose or damaged, repair it immediately; if the insulation condition is poor, replace the insulation material; If the temperature rises abnormally, check whether the cooling system is working properly. After the inspection, re-evaluate the equipment operation status. If the equipment load is found to be higher than the threshold, optimize the load distribution and transfer part of the load to other backup equipment to reduce the operating pressure of the equipment in the warning state. If the equipment operating parameters have not returned to normal after optimizing the load distribution, enable some backup power supply equipment in advance to further reduce the load of the main equipment. After enabling the backup power supply equipment, continue to monitor the equipment operation status. If it still has not returned to normal, it will be upgraded to a dangerous state and handled as a dangerous state. When a dangerous state is determined, immediately isolate the equipment in the dangerous state, stop its operation to prevent the fault from expanding, conduct a comprehensive inspection of the equipment, determine the fault point and repair it; Start the backup power supply equipment, and after the repair is completed, test the equipment and after confirming that normal operation has been restored, restore the equipment to normal operating state.

8. A system using a method for controlling the state of a plant power supply during maintenance of a high temperature gas-cooled reactor as claimed in any one of claims 1 to 7, characterized in that: It includes maintenance plan module, state control model SCM establishment module, state control plan formulation module, execution and monitoring module, state evaluation and adjustment module, maintenance plan formulation module, emergency measures formulation module and real-time monitoring and evaluation module; The maintenance plan module is used to determine which plant power supply equipment needs to be shut down according to the scheduled maintenance activities, and ensure that the power supply configuration during the maintenance period meets the minimum availability requirements; The state control model SCM establishment module is used to establish a state control model according to the number, type and location of the outage equipment, and to help predict and evaluate the plant power supply status under different configurations by performing state analysis on each working window during the maintenance period; The state control plan formulation module is used to formulate a state control plan for the plant power supply based on the results of the state analysis, including plant power supply configuration, equipment shutdown and recovery sequence, maintenance plan and emergency measures; The execution and monitoring module is used to implement the status control plan and monitor the operating status of the factory power supply in real time to ensure the effective execution of the plan and record any status changes; The state evaluation and adjustment module is used to determine the start and end time of each working window, calculate the duration, and evaluate the availability of the plant power supply according to the state transition probability matrix, and adjust the time, sequence or content of the working window; The maintenance plan formulation module is used to formulate a detailed maintenance plan according to the maintenance requirements of the plant power supply equipment, including personnel, tools, materials, time and steps; The emergency measures formulation module is used to analyze various possible power failures and consequences and formulate corresponding emergency measures, including emergency signals, instructions, operations and resource allocation; The real-time monitoring and evaluation module is used to collect operating data using the factory power supply monitoring system, identify, evaluate and predict the status, help determine whether the operating status of the power supply is normal, and take emergency measures when necessary.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images