A Safety Analysis Method for Ship Electric Power Systems Based on Potential Path Analysis

Abstract

This application discloses a safety analysis method for ship electrical systems based on potential path analysis, relating to the field of general quality characteristic design technology. This method first establishes models of each device in the system to be analyzed, equating devices with switching attributes to models with on / off control and action delay attributes. Then, it connects the device models based on connectivity data to form a system model. Based on the inherent switching action sequence of the system, it creates corresponding instruction action sequences, and based on external input signals, it creates corresponding external control instruction sets. Based on the instruction action sequences and external control instruction sets, it simulates the system model to obtain all instruction actions and state paths under control instructions, ultimately identifying potential paths. The technical solution of this application can analyze the system throughout its entire mission cycle from the perspective of actual system operating conditions and operational timing, in the form of state paths, thus improving the comprehensiveness and accuracy of potential path analysis.

Description

Technical Field

[0001] This application relates to the technical field of general quality characteristic design, and more specifically, to a method for safety analysis of ship electrical systems based on potential path analysis. Background Technology

[0002] The latent path analysis technology was initially proposed and applied by professional organizations such as Boeing in the United States. However, due to the highly specialized nature of its network tree and clue table technologies, it failed to be widely adopted and was only applied in a very few key aerospace projects such as the Apollo spacecraft and Skylab.

[0003] Given that both domestic and international professional analysis units have encountered the problem of being unable to meet the needs of technology popularization and application solely through technical services provided by specialized institutions, current latent path analysis technology is showing two development trends: 1) After obtaining comprehensive design and manufacturing data, professional research institutions will conduct comprehensive latent path analysis, continuously expanding the application of the technology in terms of product scope and depth; 2) In the early stages of design, designers will conduct latent path analysis simultaneously based on design principle data, making the application of the technology more easily accepted and mastered by ordinary designers in terms of convenience and flexibility.

[0004] Currently, the main research method is the classical network tree analysis method. Network tree analysis is based on the system network tree, identifying and analyzing its typical topological structures, and then combining this with a topological pattern analysis clue table to analyze whether each network tree has potential states. The specific analysis steps are: 1) Identify the topological structure of the network tree and determine the typical topological structures contained in each network tree; 2) Analyze each circuit topological structure pattern identified in the network tree using a basic pattern clue table.

[0005] Using classical network tree analysis for potential circuit analysis requires not only auxiliary analysis tools but also topology analysis by designers, resulting in a huge workload. Furthermore, the analysis often focuses on local functional circuits, lacking comprehensiveness. For marine power systems, compared to aerospace systems, the grid structure is more complex, and the operating states of major equipment are more varied. Using classical network tree analysis for potential path analysis has the following drawbacks: 1) The number of devices and circuits is enormous, making manual topology analysis of each network tree extremely time-consuming and labor-intensive; 2) In complex marine power systems, potential paths often only become apparent under dynamic conditions. Classical network tree analysis focuses primarily on the static structure of the system, failing to adequately analyze current and signal paths under various operating states, making it difficult to effectively simulate the dynamic behavior of the system under different operating conditions; 3) The operating conditions of marine power systems are highly variable, and the operating states of different devices are extremely complex. Classical network tree analysis methods struggle to accurately analyze the energizing status of each device in detail. Summary of the Invention

[0006] The purpose of this application is to provide a method for potential path analysis of ship power systems. The method abstracts the devices with switching attributes in the system into models with on / off control and action delay attributes. All current paths are tracked according to the system timing action parameters and external control commands to simulate the actual operating state of the system. During the simulation, the method can search and cover every timing state of the entire system to identify potential paths in the system.

[0007] The technical solution of this application is: to provide a method for safety analysis of ship electrical systems based on potential path analysis, the method comprising:

[0008] Step 1: Retrieve the design principle data of the system to be analyzed from the database. Based on the design principle data, establish the model of each device in the system to be analyzed in the latent path analysis software. For devices with switching attributes, modify their on / off control parameters and action delay parameters to predetermined parameters.

[0009] Step 2: Based on the design principle data, connect the models of each device in the system to be analyzed using latent path analysis software to form a model of the system to be analyzed.

[0010] Step 3: Create a corresponding instruction action sequence based on the inherent switching actions of the system to be analyzed, set the timing of each instruction action according to the order of the inherent switching actions, create a corresponding external control instruction set based on the external input signals of the system to be analyzed, and define the instruction action sequence and the external control instruction set in the latent path analysis software respectively.

[0011] Step 4: Perform timing simulation of command actions on the system model under analysis based on the command action sequence to obtain the state path under all command actions. Perform control command simulation on the system model under analysis based on the set of external control commands to obtain the state path under different external control commands. Compare the state path with the predetermined expected path to find potential paths that do not exist in the expected path. The path of current from the starting point to the ending point is taken as the state path.

[0012] Further, step 1 specifically includes: design principle data including design schematics and component lists; for components in the component list that have switching attributes, select the corresponding model from the basic component library of the latent path analysis software as the component model based on its switching attributes, and modify the on / off control parameters and action delay parameters of the component model to predetermined parameters so that its on / off control and action delay are consistent with the component itself; for the remaining components in the component list that do not have switching attributes, directly select the corresponding model from the basic component library of the latent path analysis software as the component model.

[0013] Furthermore, step 2 specifically includes the following steps:

[0014] Step 2.1: Divide the system to be analyzed into different functional modules according to the overall function of the system. Find the device models corresponding to each functional module according to the division results, and set the device models belonging to the same functional module in the predetermined area of ​​the functional module.

[0015] Step 2.2: Retrieve the connectivity data of the system to be analyzed from the database, and obtain the electrical connection relationship between different devices and the signal transmission path between different functional modules in the system to be analyzed based on the connectivity data;

[0016] Step 2.3: Connect the models of each device according to the connection relationship of different devices to form models of different functional modules. Connect the models of different functional modules according to the signal transmission paths between different functional modules to form a model of the system to be analyzed.

[0017] Step 2.4: Based on the component list and connectivity data, check the names of the component models, the connection relationships of the component models, and the signal transmission paths between different functional modules in the system model to be analyzed, and correct any errors.

[0018] Further, step 3 specifically includes: creating a sequence of instruction actions for the device models in the system model under analysis based on the inherent switching actions of the devices in the system under analysis, setting the timing of each instruction action according to the order of the inherent switching actions, defining the corresponding device models and instruction action sequences in the simulation analysis part of the latent path analysis software, wherein the action sequences corresponding to different device models are arranged according to the known timing sequence, creating a set of external control instructions corresponding to the system model under analysis based on the external input signals of the system under analysis, and defining the set of external control instructions in the simulation analysis part of the latent path analysis software.

[0019] Furthermore, in step 4, the timing simulation of the command action based on the command action sequence is performed on the system model to be analyzed. Specifically, this includes: in the simulation analysis part of the latent path analysis software, the system model to be analyzed is simulated sequentially according to the timing of different command actions in the command action sequence, so that the system model to be analyzed executes each command action in the timing sequence. After the command action is started, the path from the current start point to the end point is traced to obtain the state path under all command actions. The power-on status of each device model in the system model to be analyzed is obtained according to the distribution of the state path. The latent path analysis software displays the traced path.

[0020] Furthermore, in step 4, control command simulation is performed on the system model to be analyzed based on the set of external control commands. Specifically, this includes: in the simulation analysis part of the latent path analysis software, simulating each individual external control command in the set of external control commands, so that the system model to be analyzed executes the corresponding actions according to the external control commands. After a single external control command is activated, the path from the current start point to the end point is traced to obtain the state path under all command actions. The power-on status of each device model in the system model to be analyzed is obtained according to the distribution of the state path. The latent path analysis software displays the traced path.

[0021] Furthermore, step 4 also includes: comparing all state paths obtained from the simulation with the predetermined expected paths, identifying paths that do not exist in the expected paths as potential pathways, comparing the power-on status of each device model with the power-on status of each device in the expected paths, identifying locations where the power-on status is inconsistent as fault locations, and summarizing and recording the data of potential pathways and fault locations.

[0022] The beneficial effects of this application are:

[0023] The technical solution in this application equates devices with switching attributes in the system to models with on / off control and action delay attributes. By performing instruction action timing analysis and control instruction analysis on the system, the state path under the entire system is obtained. Potential paths are identified through the state path. Compared with existing methods, the state path analysis method of the technical solution in this application can not only realize path tracing and module boundary division in existing methods, but also conduct full-task-cycle analysis of the system from the perspective of actual system operating conditions and operation timing. The technical solution in this application analyzes and displays the current path in the system in the form of state path. The analysis scope comprehensively covers the entire ship power system, which can improve the comprehensiveness and accuracy of potential path analysis of ship power system and avoid missing some potential problems or hidden dangers.

[0024] The technical solution in this application can cover every temporal state of the entire system and the state analysis process under different control commands for state path analysis. It can more intuitively show every working state under the entire process of the system. At the same time, for certain special working states, local simulation analysis can be achieved by different control commands. The technical solution in this application has a wider adaptability to the analysis object, and the analysis is more accurate and intuitive, which can improve the efficiency of potential path analysis of ship power systems. Attached Figure Description

[0025] The advantages of the above and / or additional aspects of this application will become apparent and readily understood in the description of the embodiments in conjunction with the following drawings, wherein:

[0026] Figure 1This is a schematic flowchart of a ship electrical system security analysis method based on potential path analysis according to an embodiment of this application;

[0027] Figure 2 It is based on the device model library of the system to be analyzed and the equivalent model of the device in the example in this application;

[0028] Figure 3 These are functional modules modeled based on the device connectivity examples in this application;

[0029] Figure 4 It is a system model based on the system connectivity model of the example in this application;

[0030] Figure 5 This is an interface diagram of the full instruction action settings in the latent path analysis software based on the example in this application;

[0031] Figure 6 This is a simulation diagram based on the full instruction action of the example in this application;

[0032] Figure 7 It is a simulation diagram controlled by a single instruction based on the example in this application. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

[0034] In the following description, many specific details are set forth in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0035] The latent path analysis software used in the method of this invention is ZhongCheng Sneak Circuit Analysis Software (ZCSCA) V1.0. This software integrates functions such as system modeling, simulation configuration, virtual operation console and analysis result output, and is suitable for fields such as aerospace and rail transportation that require high reliability design.

[0036] like Figure 1As shown, this embodiment provides a method for safety analysis of ship power systems based on potential path analysis, including: Step 1, retrieving the design principle data of the system to be analyzed from the database, and establishing models of each device of the system to be analyzed in the potential path analysis software according to the design principle data. For devices with switching attributes, their on / off control parameters and action delay parameters are modified to predetermined parameters.

[0037] The design principle data of the system to be analyzed is retrieved from the existing ship electrical system database. This design principle data includes design schematics and component lists. Based on the design principle data, the design of the system to be analyzed is understood, and its design requirements and working principles are clarified, so as to accurately model and simulate the entire system to be analyzed in the future.

[0038] For components in the component list that have switching attributes, select the corresponding model from the basic component library of the latent path analysis software as the component model based on its switching attributes. Modify the on / off control parameters and action delay parameters of the component model to make its on / off control and action delay consistent with the component itself. For the remaining components in the component list that do not have switching attributes, directly select the corresponding model from the basic component library of the latent path analysis software as the component model. Specifically, the predetermined parameters for on / off control can be set according to the device's on conditions (on signal, i.e., the signal threshold) and off conditions (off signal and the signal threshold). The predetermined parameters for action delay can be set according to the device's on delay (the time required for the switch to actually turn on after receiving the on signal), off delay, rise time (the time for the switch to transition from the off state to full on), and fall time. In the latent path analysis software, the on / off control parameters and action delay parameters of the defined component model are used, and the initial values ​​are changed to the predetermined parameter values.

[0039] It should be noted that the basic component library contains models of all components in the system to be analyzed. For components with switching properties, such as MOSFETs, you can select a MOSFET component from the basic component library and modify parameters such as gate drive voltage, on-resistance, switching control signal, turn-on delay time, and turn-off delay time according to the data listed in the component list. This will ensure that the on-off control and action delay of the MOSFET model in dynamic simulation are consistent with the actual device, and then the MOSFET model can be verified. For the remaining components without switching properties, such as resistors, you can select resistor components from the basic component library and modify their resistance values ​​according to the resistance data listed in the component list.

[0040] In this embodiment, the components with switching attributes in the component list are equivalent to models with on / off control and action delay attributes, so that the behavior of the components in different states can be simulated more accurately during analysis, reflecting the true characteristics of the system under analysis.

[0041] In this embodiment, the component list lists all the components used in the system to be analyzed and their related attributes. The related attributes include component name, model, specifications, quantity, etc. The switching attribute refers to the switching function of the component, that is, the ability of the component to switch between the on and off states under the action of an external control signal. The switching attribute includes on / off control (i.e., changing the on and off states according to the control signal) and action delay (the delay time from receiving the control signal to actually completing the transition to the on or off state).

[0042] Step 2: Based on the design principle data, connect the models of each device in the system to be analyzed using latent path analysis software to form a model of the system to be analyzed. This specifically includes the following steps:

[0043] Step 2.1: Divide the system to be analyzed into different functional modules according to the overall function of the system. Find the device models corresponding to each functional module according to the division results, and set the device models belonging to the same functional module in the predetermined area of ​​the functional module.

[0044] In this embodiment, the system to be analyzed needs to be divided into functional modules that are simple in structure, easy to analyze, and small in area according to their functions and electrical connections. This ensures that there are no complex electrical connections between the functional modules, and that different functional modules can independently complete their predetermined tasks after receiving a predetermined trigger signal. The divided system facilitates subsequent simulation analysis, is easy to understand and debug, and allows for rapid detection and resolution of problems by testing the input and output of specific modules, thus improving efficiency. For example, a signal processing system can be divided into functional modules such as a signal acquisition module, a signal preprocessing module, a filtering module, a signal transformation module, a feature extraction module, a signal compression module, a classification and decision module (which classifies or identifies signals and outputs control commands based on the classification or identification results), and an output and display module. In this embodiment, in addition to division based on function and electrical connections, the system to be analyzed can also be divided according to actual needs, such as using power supply points, power supply buses (positive buses) at each level, power supply return buses (negative buses) at each level, power return points, centralized grounding points, command signal buses, and special function nodes as boundary points for division.

[0045] Step 2.2: Retrieve the connectivity data of the system to be analyzed from the database, and obtain the electrical connection relationship between different devices and the signal transmission path between different functional modules in the system to be analyzed based on the connectivity data;

[0046] Step 2.3: Connect the models of each device according to the connection relationship of different devices to form models of different functional modules. Connect the models of different functional modules according to the signal transmission paths between different functional modules to form a model of the system to be analyzed.

[0047] In this embodiment, all device models used by the system to be analyzed need to be set in the window of the latent path analysis software (i.e., a visual interface of the latent path analysis software), and then corresponding connections are made according to the electrical connection relationship of different devices and the signal transmission path between different functional modules.

[0048] Step 2.4: Based on the component list and connectivity data, check the names of the component models, the connection relationships of the component models, and the signal transmission paths between different functional modules in the system model to be analyzed, and correct any errors.

[0049] In this embodiment, it is necessary to verify the completed connection of the system model to be analyzed based on the component list and connectivity data. The verification content specifically includes the uniqueness and consistency of the names of the component models and the names of the interconnections between the components, the consistency of the component model parameters, the correctness of the connector matching between the circuit diagrams of the entire system model to be analyzed, and the consistency of the network node identifiers.

[0050] In this embodiment, connectivity data refers to the electrical connection information between various components in the system to be analyzed, which describes the signal paths and connection methods between the components.

[0051] Step 3: Create a corresponding instruction action sequence based on the inherent switching actions of the system to be analyzed, set the timing of each instruction action according to the order of the inherent switching actions, create a corresponding external control instruction set based on the external input signals of the system to be analyzed, and define the instruction action sequence and the external control instruction set in the latent path analysis software respectively.

[0052] Based on the inherent switching actions of the devices in the system under analysis, a sequence of instruction actions (a series of commands executed in a specific order, each representing a specific operational step; the system can only achieve its intended function by completing these steps in sequence) is created for the device models in the system model. The timing of each instruction action is set according to the sequence of the inherent switching actions. The corresponding device models and instruction action sequences are defined in the simulation analysis section of the latent path analysis software. Specifically, the names of the corresponding device models are defined in the "Action Device" column of the action sequence configuration module in the latent path analysis software, and the instruction action sequences are defined in the "Action Name" column of the action sequence configuration module. The action sequences corresponding to different device models are arranged according to their known timing. Based on the external input signals of the system under analysis, a set of external control instructions corresponding to the system model is created. This set of external control instructions is defined in the simulation analysis section of the latent path analysis software. Specifically, this set of external control instructions is defined in the instruction console of the latent path analysis software, and different external control instructions are associated with buttons on the instruction console, so that the input of external control instructions is implemented in the form of button operations.

[0053] Step 4: Perform timing simulation of command actions on the system model under analysis based on the command action sequence to obtain the state path under all command actions. Perform control command simulation on the system model under analysis based on the set of external control commands to obtain the state path under different external control commands. Compare the state path with the predetermined expected path to find potential paths that do not exist in the expected path. The path of current from the starting point to the ending point is taken as the state path.

[0054] For the timing simulation of the command actions of the system model under analysis, in the simulation analysis part of the latent path analysis software, the system model under analysis is simulated sequentially according to the timing of different command actions in the command action sequence. This allows the system model to execute each command action in sequence. After the command action is started, the path from the current start point to the end point is traced to obtain the state path under all command actions. Based on the distribution of the state path, the power-on status of each device model in the system model under analysis is obtained. Specifically, the latent path analysis software starts the command action sequence defined in the action sequence configuration module according to the set timing, causing the system model under analysis to execute each command action in sequence. The latent path analysis software starts path tracing from the current start point and ends path tracing after reaching the current end point, obtaining the state path under all command actions. The latent path analysis software then displays the traced path.

[0055] In this embodiment, for system models with a large number of instruction actions, they can be merged into the same category according to the type of instruction action. After merging, one instruction action can be selected for simulation analysis. This can simplify the simulation steps, improve efficiency, and reduce the waste of computing resources.

[0056] For the simulation of control commands for the system model under analysis, the simulation analysis part of the latent path analysis software simulates each external control command in the external control command set, causing the system model under analysis to execute corresponding actions according to the external control commands. After a single external control command is activated, the path from the current start point to the end point is traced to obtain the state path under all command actions. The power-on status of each device model in the system model under analysis is obtained based on the distribution of the state path. Specifically, in the command console of the latent path analysis software, the external control commands in the external control command set are activated sequentially by pressing the corresponding buttons. Each time an external control command is activated, the system model under analysis executes the corresponding actions according to the external control command. The latent path analysis software starts path tracing from the current start point and ends path tracing after reaching the current end point, finally obtaining the state path under all external control commands. The latent path analysis software displays the traced path.

[0057] All state paths obtained from the simulation are compared with the predetermined expected paths to identify potential paths that do not exist in the expected paths. At the same time, the power-on status of each device model is compared with the power-on status of each device in the expected paths to identify the locations where the power-on status is inconsistent as fault locations. The data of potential paths and fault locations are summarized to provide data reference for subsequent modifications.

[0058] Example: Taking a DC shore power switch and a battery switchboard as the system to be analyzed, the system composed of the DC shore power switch and the battery switchboard is modeled and simulated according to the methods in steps 1 to 4 above, as follows:

[0059] Using latent path analysis software, device modeling is performed based on the design schematic and component list. The circuit breaker in the system under analysis is then modeled equivalently, that is, transformed into a model with on / off control and action delay attributes. The device model library for this system under analysis is as follows: Figure 2 As shown;

[0060] After the device modeling is completed, the individual device models are connected based on the connectivity data of the system to be analyzed, forming the model of the entire system. Functionally, the system can be divided into two modules: a DC shore power switch and a battery switchboard. The device models are then connected based on the connectivity data (here, functional modules can be treated as devices; connecting the device models within a functional module constitutes device modeling). The modeling is completed as follows: Figure 3As shown, the two functional modules are then connected into a system according to the signal transmission relationship (i.e., the entire system is modeled), as follows. Figure 4 As shown;

[0061] After modeling is complete, switch to the simulation module and perform simulation analysis and verification of the system under analysis using the full action sequence simulation mode. The action sequence settings are as follows: Figure 5 As shown, the simulation state path for the entire action sequence is as follows: Figure 6 As shown, the red markers in the model of the system to be analyzed represent paths through which current flows, and the green markers represent voltage.

[0062] Simulation analysis and verification are performed based on the configured command console. The energization status of each component under a single command is used to determine if any potential circuit paths exist. In the command console, red buttons indicate triggered simulation, while blue buttons indicate untriggered simulation. The specific simulation state paths in the command console are as follows: Figure 7 As shown.

[0063] Using the two methods described above, namely action sequence simulation and command control simulation, all current paths of the system consisting of DC shore power switch and battery switchboard were simulated. The simulation results were compared with the predetermined expected paths. No potential paths or fault locations were found, indicating that all current paths in the system meet the expectations. It is preliminarily judged that the system has reliability and stability in actual operation.

[0064] The steps in this application can be rearranged, combined, or deleted according to actual needs.

[0065] The units in the device of this application can be merged, divided, or deleted according to actual needs.

[0066] Although this application has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and not intended to limit the application of this application. The scope of protection of this application is defined by the appended claims and may include various variations, modifications, and equivalents of the invention without departing from the scope and spirit of this application.

Claims

1. A method for analyzing the safety of a ship power system based on latent pathway analysis, characterized by, The method comprises: Step 1, retrieve the design principle data of the system to be analyzed from the database, and establish the model of each device of the system to be analyzed in the potential path analysis software according to the design principle data, wherein for the device with switch attribute, select the function corresponding model and modify the on-off control parameter and action time delay parameter to the predetermined parameter; Step 2, connect the model of each device in the system to be analyzed according to the design principle data through the potential path analysis software to form the model of the system to be analyzed, specifically including: Step 2.1, divide the system to be analyzed into different functional modules according to the overall function, find out the device model corresponding to each functional module according to the division result, and set the device model belonging to the same functional module in the predetermined area of the functional module; Step 2.2, retrieve the connectivity data of the system to be analyzed from the database, and obtain the electrical connection relationship between different devices and the signal transmission path between different functional modules according to the connectivity data; Step 2.3, connect the models of different functional modules according to the connection relationship of different devices to form the model of different functional modules, and connect the models of different functional modules according to the signal transmission path between different functional modules to form the model of the system to be analyzed; Step 3, create the corresponding instruction action sequence according to the inherent switch action of the system to be analyzed, set the time sequence of each instruction action according to the sequence of the inherent switch action, create the corresponding external control instruction set according to the external input signal of the system to be analyzed, and define the instruction action sequence and the external control instruction set in the potential path analysis software respectively; Step 4, perform instruction action time sequence simulation on the system model to be analyzed based on the instruction action sequence, track the path from the current starting point to the terminal point after the instruction action is started, obtain the state path under all instruction actions, perform control instruction simulation on the system model to be analyzed based on the external control instruction set, track the path from the current starting point to the terminal point after a single external control instruction is started, obtain the state path under different external control instructions, compare the state path with the predetermined expected path, and find out the potential path that does not exist in the expected path, wherein the path from the current starting point to the terminal point is taken as the state path.

2. The method for ship power system safety analysis based on latent pathway analysis according to claim 1, wherein, The step 1 specifically comprises: The design principle data comprises a design principle diagram and a component list, for the device with switch attribute in the component list, select the function corresponding model in the basic device library of the potential path analysis software as the device model according to the switch attribute, and modify the on-off control parameter and action time delay parameter of the device model to the predetermined parameter, so that the on-off control and action time delay are consistent with the device itself, and for the remaining devices without switch attribute in the component list, directly select the corresponding model in the basic device library of the potential path analysis software as the device model.

3. The method for ship power system safety analysis based on latent path analysis according to claim 2, wherein, The step 2 further comprises the following steps: Based on the component list and connectivity data, the name of the device model in the system model to be analyzed, the connection relationship of the device model and the signal transmission path between different functional modules are checked, and the error position is corrected.

4. The method for ship power system safety analysis based on latent path analysis according to claim 3, wherein, The step 3 specifically includes: According to the inherent switching action of the device in the system to be analyzed, the instruction action sequence of the device model in the system model to be analyzed is created, and the time sequence of each instruction action is set according to the sequence of the inherent switching action. The corresponding device model and instruction action sequence are defined in the simulation analysis part of the latent path analysis software, wherein the action sequences corresponding to different device models are arranged according to the known time sequence. According to the external input signal of the system to be analyzed, the corresponding external control instruction set of the system model to be analyzed is created, and the external control instruction set is defined in the simulation analysis part of the latent path analysis software.

5. The method for ship power system safety analysis based on latent path analysis according to claim 4, wherein, The step 4 of simulating the system model to be analyzed based on the instruction action sequence specifically includes: In the simulation analysis part of the latent path analysis software, the system model to be analyzed is simulated in sequence according to the time sequence of different instruction actions in the instruction action sequence, so that the system model to be analyzed executes each instruction action in sequence, obtains the state path under all instruction actions, and obtains the energization condition of each device model in the system model to be analyzed according to the distribution of the state path. The latent path analysis software displays the tracked path.

6. The method for ship power system safety analysis based on latent path analysis according to claim 5, wherein, The step 4 of simulating the system model to be analyzed based on the external control instruction set specifically includes: In the simulation analysis part of the latent path analysis software, each external control instruction in the external control instruction set is simulated respectively, so that the system model to be analyzed executes the corresponding action according to the external control instruction, obtains the state path under all instruction actions, and obtains the energization condition of each device model in the system model to be analyzed according to the distribution of the state path. The latent path analysis software displays the tracked path.

7. The method for ship power system safety analysis based on latent path analysis according to claim 6, wherein, The step 4 further includes: All state paths obtained by simulation are compared with the predetermined expected path, and the path that does not exist in the expected path is found as a potential path. The energization condition of each device model is compared with the energization condition of each device in the expected path, and the position where the energization condition is inconsistent is found as a fault position. The data of the potential path and the fault position are summarized and recorded.

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