CN111596641A - Fault analysis method and device, storage medium and equipment for emergency diesel engine of nuclear power station - Google Patents
Fault analysis method and device, storage medium and equipment for emergency diesel engine of nuclear power station Download PDFInfo
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- CN111596641A CN111596641A CN202010297913.XA CN202010297913A CN111596641A CN 111596641 A CN111596641 A CN 111596641A CN 202010297913 A CN202010297913 A CN 202010297913A CN 111596641 A CN111596641 A CN 111596641A
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- G05B23/00—Testing or monitoring of control systems or parts thereof
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- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0243—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults model based detection method, e.g. first-principles knowledge model
- G05B23/0245—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults model based detection method, e.g. first-principles knowledge model based on a qualitative model, e.g. rule based; if-then decisions
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Abstract
The application belongs to the technical field of emergency power supplies of nuclear power plants, and particularly relates to a fault analysis method and device for an emergency diesel engine of a nuclear power plant, a computer readable storage medium and terminal equipment. According to the method, boundary division is carried out on each subsystem in an emergency diesel engine system of a nuclear power station according to a preset boundary division mode; constructing a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer; and carrying out fault analysis on the faults of the emergency diesel engine system according to the constructed fault tree model, and outputting a fault analysis result. Through this application embodiment, guaranteed that the scope of analytic process is clear, the border is clear, avoided the omission that probably appears, construct the trouble tree model of emergent diesel engine system on this basis, when emergent diesel engine system breaks down, can carry out fault analysis according to this trouble tree model to output failure analysis result, thereby guaranteed the accuracy of analysis result, can effectively stop the potential safety hazard.
Description
Technical Field
The application belongs to the technical field of emergency power supplies of nuclear power plants, and particularly relates to a fault analysis method and device for an emergency diesel engine of a nuclear power plant, a computer readable storage medium and terminal equipment.
Background
In a nuclear power station, an emergency diesel engine supplies power to medium and low voltage nuclear auxiliary equipment required by safe shutdown of a nuclear power unit, and is very important for safe operation of the whole nuclear power station system. However, due to the various types and complex structures of the devices in the emergency diesel engine system, omission is easily caused when fault analysis is performed on the emergency diesel engine system by using the prior art, so that the analysis result is deviated, and a large potential safety hazard is caused.
Disclosure of Invention
In view of this, the embodiment of the application provides a method and a device for analyzing faults of an emergency diesel engine of a nuclear power station, a computer readable storage medium and a terminal device, so as to solve the problem that in the prior art, omission is easily caused in fault analysis of the emergency diesel engine, so that an analysis result is deviated, and a large potential safety hazard is caused.
A first aspect of an embodiment of the present application provides a method for analyzing a fault of an emergency diesel engine in a nuclear power plant, which may include:
carrying out boundary division on each subsystem in an emergency diesel engine system of the nuclear power station according to a preset boundary division mode;
constructing a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer;
and carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model, and outputting a fault analysis result.
Further, the boundary division is performed on each subsystem in the emergency diesel engine system of the nuclear power plant according to a preset boundary division mode, and the boundary division includes:
dividing a cylinder assembly, a crankshaft connecting rod assembly, a piston assembly, a timing gear assembly, a camshaft assembly, a rocker arm assembly, a valve assembly and a crankcase assembly into a diesel engine body, and dividing an oil injection pump and an oil injector into a fuel oil supply subsystem;
taking a generator stator outlet terminal as a boundary between a generator body and a power distribution subsystem, dividing components within the generator stator outlet terminal into the generator body, and dividing components outside the generator stator outlet terminal into the power distribution subsystem;
taking an excitation switch wiring terminal as a boundary between the generator body and an excitation regulation subsystem, dividing components inside the excitation switch wiring terminal into the generator body, and dividing components outside the excitation switch wiring terminal into the excitation regulation subsystem;
taking a signal transfer box wiring terminal as a boundary between monitoring equipment and a local control subsystem, dividing components inside the signal transfer box wiring terminal into the monitoring equipment, and dividing components outside the signal transfer box wiring terminal into the local control subsystem;
the method comprises the steps of taking a distribution box wiring terminal as a boundary between electric equipment and a power supply support subsystem, dividing components inside the distribution box wiring terminal into the electric equipment, and dividing components outside the distribution box wiring terminal into the power supply support subsystem.
Further, the fault tree model includes: top, middle, and bottom events;
the fault tree model of the emergency diesel engine system after boundary division is constructed according to the sequence from the top layer to the bottom layer, and the fault tree model comprises the following steps:
constructing a top event of the fault tree model, wherein the top event is various fault phenomena of the emergency diesel engine system;
constructing an intermediate event of the fault tree model, wherein the intermediate event is a process node of a fault diagnosis path of the emergency diesel engine system, and mutually exclusive relations exist among process nodes on the same layer;
and constructing a bottom event of the fault tree model, wherein the bottom event is the smallest part with faults in the emergency diesel engine system.
Further, the fault analysis of the fault occurring in the emergency diesel engine system according to the constructed fault tree model and outputting a fault analysis result includes:
analyzing the fault tree model layer by layer according to the fault of the emergency diesel engine system from the top layer to the bottom layer to obtain a minimum cut set corresponding to the fault of the emergency diesel engine system;
and respectively calculating the importance of each bottom event in the minimum cut set, and outputting a fault analysis result according to the order of the importance from large to small.
Further, the step of analyzing the fault tree model layer by layer according to the fault of the emergency diesel engine system from the top layer to the bottom layer to obtain a minimum cut set corresponding to the fault of the emergency diesel engine system includes:
determining a top event corresponding to the fault of the emergency diesel engine system, and taking the determined top event as a current node;
determining candidate fault nodes based on logic gates connecting the current node and each child node thereof and fault probabilities corresponding to each child node;
acquiring state data of a candidate component, and judging whether the candidate component has a fault according to a fault condition associated with the candidate fault node and the state data, wherein the candidate component is a component corresponding to the candidate fault node;
if the candidate component has a fault, taking the candidate fault node as the current node, and returning to execute the step of determining the candidate fault node based on the logic gate connecting the current node and each child node thereof and the fault probability corresponding to each child node and the subsequent steps until each child node of the current node is a bottom event;
and determining each child node of the current node as a minimum cut set corresponding to the fault of the emergency diesel engine system.
Further, the calculating the importance of each bottom event in the minimal cut set respectively includes:
determining an initial weight of each target bottom event, wherein the target bottom event is the bottom event in the minimum cut set;
respectively counting the occurrence frequency of each target bottom event according to a preset historical fault record; respectively calculating the correction weight of each target bottom event according to the occurrence frequency of each target bottom event;
and determining the importance of each target background event according to the initial weight and the corrected weight of each target background event.
Further, after performing fault analysis on the fault occurring in the emergency diesel engine system according to the constructed fault tree model and outputting a fault analysis result, the method further includes:
and searching solution information corresponding to the fault analysis result in a preset database, and sending the solution information to preset terminal equipment.
A second aspect of the embodiments of the present application provides a fault analysis device for an emergency diesel engine in a nuclear power plant, which may include:
the boundary dividing module is used for dividing the boundary of each subsystem in the emergency diesel engine system of the nuclear power station according to a preset boundary dividing mode;
the fault tree model building module is used for building a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer;
and the fault analysis module is used for carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model and outputting a fault analysis result.
Further, the boundary dividing module is specifically configured to:
dividing a cylinder assembly, a crankshaft connecting rod assembly, a piston assembly, a timing gear assembly, a camshaft assembly, a rocker arm assembly, a valve assembly and a crankcase assembly into a diesel engine body, and dividing an oil injection pump and an oil injector into a fuel oil supply subsystem;
taking a generator stator outlet terminal as a boundary between a generator body and a power distribution subsystem, dividing components within the generator stator outlet terminal into the generator body, and dividing components outside the generator stator outlet terminal into the power distribution subsystem;
taking an excitation switch wiring terminal as a boundary between the generator body and an excitation regulation subsystem, dividing components inside the excitation switch wiring terminal into the generator body, and dividing components outside the excitation switch wiring terminal into the excitation regulation subsystem;
taking a signal transfer box wiring terminal as a boundary between monitoring equipment and a local control subsystem, dividing components inside the signal transfer box wiring terminal into the monitoring equipment, and dividing components outside the signal transfer box wiring terminal into the local control subsystem;
the method comprises the steps of taking a distribution box wiring terminal as a boundary between electric equipment and a power supply support subsystem, dividing components inside the distribution box wiring terminal into the electric equipment, and dividing components outside the distribution box wiring terminal into the power supply support subsystem.
Further, the fault tree model includes: top, middle, and bottom events; the fault tree model building module is specifically configured to:
constructing a top event of the fault tree model, wherein the top event is various fault phenomena of the emergency diesel engine system;
constructing an intermediate event of the fault tree model, wherein the intermediate event is a process node of a fault diagnosis path of the emergency diesel engine system, and mutually exclusive relations exist among process nodes on the same layer;
and constructing a bottom event of the fault tree model, wherein the bottom event is the smallest part with faults in the emergency diesel engine system.
Further, the fault analysis module includes:
the minimum cut set determining unit is used for analyzing the fault tree model layer by layer according to the fault of the emergency diesel engine system from the top layer to the bottom layer to obtain a minimum cut set corresponding to the fault of the emergency diesel engine system;
and the importance calculating unit is used for calculating the importance of each bottom event in the minimum cut set respectively and outputting a fault analysis result according to the order of the importance from large to small.
Further, the minimal cut set determining unit includes:
the top event determining subunit is used for determining a top event corresponding to the fault of the emergency diesel engine system and taking the determined top event as a current node;
a candidate fault node determining subunit, configured to determine a candidate fault node based on the logic gates connecting the current node and each of the child nodes thereof and the fault probability corresponding to each of the child nodes;
the fault judging subunit is used for acquiring state data of a candidate component, and judging whether the candidate component has a fault according to a fault condition associated with the candidate fault node and the state data, wherein the candidate component is a component corresponding to the candidate fault node;
a current node determining subunit, configured to, if the candidate component has a fault, take the candidate faulty node as the current node;
and the minimum cut set determining subunit is used for determining each sub node of the current node as a minimum cut set corresponding to the fault of the emergency diesel engine system.
Further, the importance calculating unit includes:
an initial weight determining subunit, configured to determine an initial weight of each target base event, where the target base event is a base event in the minimum cut set;
the correction weight determining subunit is used for respectively counting the occurrence frequency of each target bottom event according to a preset historical fault record; respectively calculating the correction weight of each target bottom event according to the occurrence frequency of each target bottom event;
and the importance degree calculation subunit is used for determining the importance degree of each target bottom event according to the initial weight and the corrected weight of each target bottom event.
Further, the fault analysis device for the emergency diesel engine of the nuclear power station may further include:
and the solution information searching module is used for searching solution information corresponding to the fault analysis result in a preset database and sending the solution information to preset terminal equipment.
A third aspect of the embodiments of the present application provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of any one of the methods for analyzing a fault of an emergency diesel engine in a nuclear power plant.
A fourth aspect of the embodiments of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and operable on the processor, where the processor implements the steps of any one of the methods for analyzing a fault of an emergency diesel engine in a nuclear power plant when executing the computer program.
A fifth aspect of the embodiments of the present application provides a computer program product, which, when running on a terminal device, causes the terminal device to execute any of the steps of the method for analyzing a fault of an emergency diesel engine in a nuclear power plant.
Compared with the prior art, the embodiment of the application has the advantages that: according to the method, each subsystem in an emergency diesel engine system of the nuclear power station is subjected to boundary division according to a preset boundary division mode; constructing a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer; and carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model, and outputting a fault analysis result. Through this application embodiment, the scope of having guaranteed follow-up analytic process through the boundary division is clear, the boundary is clear, has avoided the omission that probably appears, has constructed the trouble tree model of emergent diesel engine system on this basis, as the reasonable foundation that carries out failure analysis, when emergent diesel engine system breaks down, can carry out failure analysis according to this trouble tree model to output failure analysis result, thereby guaranteed the accuracy of analysis result, can effectively stop the potential safety hazard.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of an embodiment of a method for analyzing a fault of an emergency diesel engine of a nuclear power plant in an embodiment of the present application;
FIG. 2 is a schematic flow diagram of fault analysis of an emergency diesel engine system for faults based on a constructed fault tree model;
fig. 3 is a structural diagram of an embodiment of a fault analysis device for an emergency diesel engine of a nuclear power plant in an embodiment of the present application;
fig. 4 is a schematic block diagram of a terminal device in an embodiment of the present application.
Detailed Description
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
In addition, in the description of the present application, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, an embodiment of a method for analyzing a fault of an emergency diesel engine of a nuclear power plant according to an embodiment of the present application may include:
and S101, carrying out boundary division on each subsystem in the emergency diesel engine system of the nuclear power station according to a preset boundary division mode.
In a specific implementation of the embodiment of the present application, the boundary division may be performed as follows:
dividing a cylinder assembly, a crankshaft connecting rod assembly, a piston assembly, a timing gear assembly, a camshaft assembly, a rocker arm assembly, a valve assembly and a crankcase assembly into a diesel engine body, and dividing an oil injection pump and an oil injector into a fuel oil supply subsystem;
taking a generator stator outlet terminal as a boundary between a generator body and a power distribution subsystem, dividing components within the generator stator outlet terminal into the generator body, and dividing components outside the generator stator outlet terminal into the power distribution subsystem;
taking an excitation switch wiring terminal as a boundary between the generator body and an excitation regulation subsystem, dividing components inside the excitation switch wiring terminal into the generator body, and dividing components outside the excitation switch wiring terminal into the excitation regulation subsystem;
taking a signal transfer box wiring terminal as a boundary between monitoring equipment and a local control subsystem, dividing components inside the signal transfer box wiring terminal into the monitoring equipment, and dividing components outside the signal transfer box wiring terminal into the local control subsystem;
the method comprises the steps of taking a distribution box wiring terminal as a boundary between electric equipment and a power supply support subsystem, dividing components inside the distribution box wiring terminal into the electric equipment, and dividing components outside the distribution box wiring terminal into the power supply support subsystem.
And S102, constructing a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer.
Wherein the fault tree model may include: a top event, a middle event, and a bottom event, step S102 may specifically include the following processes:
and S1021, constructing a top event of the fault tree model.
The top events are various fault phenomena of the emergency diesel engine system, and each top event corresponds to a fault tree and serves as a first node of the fault tree.
And step S1022, constructing an intermediate event of the fault tree model.
The intermediate event is a process node of a fault diagnosis path of the emergency diesel engine system, and the process nodes on the same layer are in mutual exclusion relation.
And S1023, constructing a bottom event of the fault tree model.
The bottom event is a minimum part with a fault in the emergency diesel engine system, namely a basic part with the fault, which cannot be continuously expanded in the fault tree, and serves as a tail node of the fault tree.
Different nodes in each layer of the fault tree model respectively correspond to different components in the emergency diesel engine system, each node is connected with a child node thereof through a logic gate, the component corresponding to the child node of each node is located in the component corresponding to the node, and each node is associated with at least one fault condition.
In general, all nodes of the fault tree model are faults, and faults occurring in child nodes are fault reasons of faults occurring in parent nodes. The logic gates between the parent node and the child node may include, but are not limited to, and gates, or gates, not gates, nand gates, and the like. For example, an and gate is defined such that a parent node will fail only if all devices corresponding to child nodes fail. The definition of the or gate is that when at least one device corresponding to the child node fails, the parent node fails. The NOT gate is used for indicating that when the device corresponding to the child node does not fail, the parent node fails. A nand gate functions similarly to a combination of and not gates to indicate that a parent node fails when at least one of the child nodes does not fail.
And S103, carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model, and outputting a fault analysis result.
Firstly, according to the fault of the emergency diesel engine system, the fault tree model is analyzed layer by layer from the top layer to the bottom layer to obtain the minimum cut set corresponding to the fault of the emergency diesel engine system.
This analysis process may specifically comprise the steps as shown in fig. 2:
and step S1031, determining a top event corresponding to the fault of the emergency diesel engine system, and taking the determined top event as a current node.
Step S1032, determining candidate failure nodes based on the logic gates connecting the current node and each of the child nodes and the failure probabilities corresponding to each of the child nodes.
In a specific implementation process, a corresponding failure probability can be preset for each child node according to actual conditions so as to display the possibility of failure of a parent node when the child node fails. It is understood that when a parent node fails, several child nodes with high failure probability are all possible failed nodes. In addition, when determining the number of possible failure nodes, reference is made to logic gates connecting the parent node and the child nodes.
Step S1033, obtaining status data of the candidate component, and determining whether the candidate component has a fault according to the fault condition associated with the candidate fault node and the status data.
The candidate component is a component corresponding to the candidate fault node. The fault condition is a fault criterion, and is normal under what conditions, and is abnormal under what conditions, that is, the state of the component corresponding to the node is abnormal. For example, if a component is operated at 220V, if it is not satisfied with 220V, the voltage of the component is considered abnormal, and a fault can be located in the component. Of course, this is merely an example, and the actual operation may be set to a fault condition according to different applications and requirements. The state data is parameter setting information when the component corresponding to the node normally operates. Because each part has parameters of normal operation, such as power, temperature and the like, if the parameters do not accord with the specified numerical values, the fault can be considered to occur, the fault analysis method of the embodiment of the application is utilized to approach layer by layer, finally, a fault root node is found, and the fault is rapidly and accurately solved according to the given fault solution.
And S1034, if the candidate part has a fault, taking the candidate fault node as the current node.
Then, the process returns to step S1032 and the subsequent steps until each child node of the current node is a bottom event, and then step S1035 is executed.
And step S1035, determining each child node of the current node as a minimum cut set corresponding to the fault of the emergency diesel engine system.
After the minimum cut set is obtained, the importance of each bottom event in the minimum cut set can be respectively calculated, and the fault analysis results are output according to the order of the importance from large to small.
First, the initial weight of each target bottom event is determined. The target base event is the base event in the minimal cut set. In the embodiment of the present application, initial weights may be respectively assigned to the bottom events in the minimum cut set according to expert experience and the size of the probability of failure, and the sum of the initial weights of all the bottom events in the minimum cut set is 1.
Then, respectively counting the occurrence frequency of each target bottom event according to a preset historical fault record; and respectively calculating the correction weight of each target bottom event according to the occurrence frequency of each target bottom event. For any target base event, the correction weight value is positively correlated with the occurrence frequency, that is, if the occurrence frequency is more, the correction weight value is larger, and otherwise, if the occurrence frequency is less, the correction weight value is smaller.
And finally, determining the importance of each target event according to the initial weight and the corrected weight of each target event. In the embodiment of the present application, for any target base event, the importance of the target base event may be the product of the initial weight and the modified weight. After the importance of each target base event is obtained through calculation, the importance can be sequentially output according to the order from large to small, and a final fault analysis result is obtained.
Further, after the fault analysis result is output, solution information corresponding to the fault analysis result can be searched in a preset database, and the solution information is sent to preset terminal equipment, so that corresponding staff can perform fault processing according to the solution information.
In summary, in the embodiment of the present application, boundary division is performed on each subsystem in an emergency diesel engine system of a nuclear power station according to a preset boundary division manner; constructing a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer; and carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model, and outputting a fault analysis result. Through this application embodiment, the scope of having guaranteed follow-up analytic process through the boundary division is clear, the boundary is clear, has avoided the omission that probably appears, has constructed the trouble tree model of emergent diesel engine system on this basis, as the reasonable foundation that carries out failure analysis, when emergent diesel engine system breaks down, can carry out failure analysis according to this trouble tree model to output failure analysis result, thereby guaranteed the accuracy of analysis result, can effectively stop the potential safety hazard.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 3 shows a structure diagram of an embodiment of a fault analysis device for an emergency diesel engine of a nuclear power plant according to an embodiment of the present application, which corresponds to the fault analysis method for the emergency diesel engine of the nuclear power plant according to the foregoing embodiment.
In this embodiment, a nuclear power station emergency diesel engine fault analysis device may include:
the boundary dividing module 301 is configured to perform boundary division on each subsystem in an emergency diesel engine system of the nuclear power plant according to a preset boundary dividing manner;
a fault tree model building module 302, configured to build a fault tree model of the emergency diesel engine system after boundary division according to a sequence from a top layer to a bottom layer;
and the fault analysis module 303 is configured to perform fault analysis on a fault occurring in the emergency diesel engine system according to the constructed fault tree model, and output a fault analysis result.
Further, the boundary dividing module is specifically configured to:
dividing a cylinder assembly, a crankshaft connecting rod assembly, a piston assembly, a timing gear assembly, a camshaft assembly, a rocker arm assembly, a valve assembly and a crankcase assembly into a diesel engine body, and dividing an oil injection pump and an oil injector into a fuel oil supply subsystem;
taking a generator stator outlet terminal as a boundary between a generator body and a power distribution subsystem, dividing components within the generator stator outlet terminal into the generator body, and dividing components outside the generator stator outlet terminal into the power distribution subsystem;
taking an excitation switch wiring terminal as a boundary between the generator body and an excitation regulation subsystem, dividing components inside the excitation switch wiring terminal into the generator body, and dividing components outside the excitation switch wiring terminal into the excitation regulation subsystem;
taking a signal transfer box wiring terminal as a boundary between monitoring equipment and a local control subsystem, dividing components inside the signal transfer box wiring terminal into the monitoring equipment, and dividing components outside the signal transfer box wiring terminal into the local control subsystem;
the method comprises the steps of taking a distribution box wiring terminal as a boundary between electric equipment and a power supply support subsystem, dividing components inside the distribution box wiring terminal into the electric equipment, and dividing components outside the distribution box wiring terminal into the power supply support subsystem.
Further, the fault tree model includes: top, middle, and bottom events; the fault tree model building module is specifically configured to:
constructing a top event of the fault tree model, wherein the top event is various fault phenomena of the emergency diesel engine system;
constructing an intermediate event of the fault tree model, wherein the intermediate event is a process node of a fault diagnosis path of the emergency diesel engine system, and mutually exclusive relations exist among process nodes on the same layer;
and constructing a bottom event of the fault tree model, wherein the bottom event is the smallest part with faults in the emergency diesel engine system.
Further, the fault analysis module includes:
the minimum cut set determining unit is used for analyzing the fault tree model layer by layer according to the fault of the emergency diesel engine system from the top layer to the bottom layer to obtain a minimum cut set corresponding to the fault of the emergency diesel engine system;
and the importance calculating unit is used for calculating the importance of each bottom event in the minimum cut set respectively and outputting a fault analysis result according to the order of the importance from large to small.
Further, the minimal cut set determining unit includes:
the top event determining subunit is used for determining a top event corresponding to the fault of the emergency diesel engine system and taking the determined top event as a current node;
a candidate fault node determining subunit, configured to determine a candidate fault node based on the logic gates connecting the current node and each of the child nodes thereof and the fault probability corresponding to each of the child nodes;
the fault judging subunit is used for acquiring state data of a candidate component, and judging whether the candidate component has a fault according to a fault condition associated with the candidate fault node and the state data, wherein the candidate component is a component corresponding to the candidate fault node;
a current node determining subunit, configured to, if the candidate component has a fault, take the candidate faulty node as the current node;
and the minimum cut set determining subunit is used for determining each sub node of the current node as a minimum cut set corresponding to the fault of the emergency diesel engine system.
Further, the importance calculating unit includes:
an initial weight determining subunit, configured to determine an initial weight of each target base event, where the target base event is a base event in the minimum cut set;
the correction weight determining subunit is used for respectively counting the occurrence frequency of each target bottom event according to a preset historical fault record; respectively calculating the correction weight of each target bottom event according to the occurrence frequency of each target bottom event;
and the importance degree calculation subunit is used for determining the importance degree of each target bottom event according to the initial weight and the corrected weight of each target bottom event.
Further, the fault analysis device for the emergency diesel engine of the nuclear power station may further include:
and the solution information searching module is used for searching solution information corresponding to the fault analysis result in a preset database and sending the solution information to preset terminal equipment.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, modules and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Fig. 4 shows a schematic block diagram of a terminal device provided in an embodiment of the present application, and only shows a part related to the embodiment of the present application for convenience of description.
As shown in fig. 4, the terminal device 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in said memory 41 and executable on said processor 40. When the processor 40 executes the computer program 42, the steps in each embodiment of the method for analyzing a fault of an emergency diesel engine in a nuclear power plant, such as the steps S101 to S103 shown in fig. 1, are implemented. Alternatively, the processor 40, when executing the computer program 42, implements the functions of each module/unit in the above-mentioned device embodiments, for example, the functions of the modules 301 to 303 shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 42 in the terminal device 4.
The terminal device 4 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. It will be understood by those skilled in the art that fig. 4 is only an example of the terminal device 4, and does not constitute a limitation to the terminal device 4, and may include more or less components than those shown, or combine some components, or different components, for example, the terminal device 4 may further include an input-output device, a network access device, a bus, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the terminal device 4, such as a hard disk or a memory of the terminal device 4. The memory 41 may also be an external storage device of the terminal device 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the terminal device 4. The memory 41 is used for storing the computer program and other programs and data required by the terminal device 4. The memory 41 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A fault analysis method for an emergency diesel engine of a nuclear power station is characterized by comprising the following steps:
carrying out boundary division on each subsystem in an emergency diesel engine system of the nuclear power station according to a preset boundary division mode;
constructing a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer;
and carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model, and outputting a fault analysis result.
2. The method for analyzing the fault of the emergency diesel engine of the nuclear power plant according to claim 1, wherein the boundary division is performed on each subsystem in the emergency diesel engine system of the nuclear power plant according to a preset boundary division mode, and the method comprises the following steps:
dividing a cylinder assembly, a crankshaft connecting rod assembly, a piston assembly, a timing gear assembly, a camshaft assembly, a rocker arm assembly, a valve assembly and a crankcase assembly into a diesel engine body, and dividing an oil injection pump and an oil injector into a fuel oil supply subsystem;
taking a generator stator outlet terminal as a boundary between a generator body and a power distribution subsystem, dividing components within the generator stator outlet terminal into the generator body, and dividing components outside the generator stator outlet terminal into the power distribution subsystem;
taking an excitation switch wiring terminal as a boundary between the generator body and an excitation regulation subsystem, dividing components inside the excitation switch wiring terminal into the generator body, and dividing components outside the excitation switch wiring terminal into the excitation regulation subsystem;
taking a signal transfer box wiring terminal as a boundary between monitoring equipment and a local control subsystem, dividing components inside the signal transfer box wiring terminal into the monitoring equipment, and dividing components outside the signal transfer box wiring terminal into the local control subsystem;
the method comprises the steps of taking a distribution box wiring terminal as a boundary between electric equipment and a power supply support subsystem, dividing components inside the distribution box wiring terminal into the electric equipment, and dividing components outside the distribution box wiring terminal into the power supply support subsystem.
3. The method for analyzing the fault of the emergency diesel engine of the nuclear power plant as claimed in claim 1, wherein the fault tree model comprises: top, middle, and bottom events;
the fault tree model of the emergency diesel engine system after boundary division is constructed according to the sequence from the top layer to the bottom layer, and the fault tree model comprises the following steps:
constructing a top event of the fault tree model, wherein the top event is various fault phenomena of the emergency diesel engine system;
constructing an intermediate event of the fault tree model, wherein the intermediate event is a process node of a fault diagnosis path of the emergency diesel engine system, and mutually exclusive relations exist among process nodes on the same layer;
and constructing a bottom event of the fault tree model, wherein the bottom event is the smallest part with faults in the emergency diesel engine system.
4. The method for analyzing the fault of the emergency diesel engine of the nuclear power plant according to claim 3, wherein the analyzing the fault of the emergency diesel engine system according to the constructed fault tree model and outputting the fault analysis result comprises:
analyzing the fault tree model layer by layer according to the fault of the emergency diesel engine system from the top layer to the bottom layer to obtain a minimum cut set corresponding to the fault of the emergency diesel engine system;
and respectively calculating the importance of each bottom event in the minimum cut set, and outputting a fault analysis result according to the order of the importance from large to small.
5. The method for analyzing the fault of the emergency diesel engine of the nuclear power plant according to claim 4, wherein the step of analyzing the fault tree model layer by layer according to the fault of the emergency diesel engine system from the top layer to the bottom layer to obtain a minimum cut set corresponding to the fault of the emergency diesel engine system comprises the following steps:
determining a top event corresponding to the fault of the emergency diesel engine system, and taking the determined top event as a current node;
determining candidate fault nodes based on logic gates connecting the current node and each child node thereof and fault probabilities corresponding to each child node;
acquiring state data of a candidate component, and judging whether the candidate component has a fault according to a fault condition associated with the candidate fault node and the state data, wherein the candidate component is a component corresponding to the candidate fault node;
if the candidate component has a fault, taking the candidate fault node as the current node, and returning to execute the step of determining the candidate fault node based on the logic gate connecting the current node and each child node thereof and the fault probability corresponding to each child node and the subsequent steps until each child node of the current node is a bottom event;
and determining each child node of the current node as a minimum cut set corresponding to the fault of the emergency diesel engine system.
6. The method for analyzing the fault of the emergency diesel engine of the nuclear power plant as claimed in claim 4, wherein the step of respectively calculating the importance of each base event in the minimal cut set comprises the steps of:
determining an initial weight of each target bottom event, wherein the target bottom event is the bottom event in the minimum cut set;
respectively counting the occurrence frequency of each target bottom event according to a preset historical fault record; respectively calculating the correction weight of each target bottom event according to the occurrence frequency of each target bottom event;
and determining the importance of each target background event according to the initial weight and the corrected weight of each target background event.
7. The method for analyzing the fault of the emergency diesel engine of the nuclear power plant according to any one of claims 1 to 6, after performing fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model and outputting a fault analysis result, further comprising:
and searching solution information corresponding to the fault analysis result in a preset database, and sending the solution information to preset terminal equipment.
8. The utility model provides a nuclear power station emergency diesel engine fault analysis device which characterized in that includes:
the boundary dividing module is used for dividing the boundary of each subsystem in the emergency diesel engine system of the nuclear power station according to a preset boundary dividing mode;
the fault tree model building module is used for building a fault tree model of the emergency diesel engine system after boundary division according to the sequence from the top layer to the bottom layer;
and the fault analysis module is used for carrying out fault analysis on the fault of the emergency diesel engine system according to the constructed fault tree model and outputting a fault analysis result.
9. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for analyzing a fault in an emergency diesel engine of a nuclear power plant according to any one of claims 1 to 7.
10. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the method for analyzing a fault in an emergency diesel engine of a nuclear power plant according to any one of claims 1 to 7.
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