Ship power system safety analysis method based on potential path analysis

Abstract

The invention discloses a potential path analysis-based ship power system safety analysis method, and relates to the technical field of general quality characteristic design, and the method comprises the steps: firstly building a model of each device in a to-be-analyzed system, enabling a device with a switch attribute to be equivalent to a model with an on-off control and action time delay attribute, and enabling the model to be equivalent to a model with an on-off control and action time delay attribute; connecting the device models according to the connectivity data to form a system model, creating a corresponding instruction action sequence according to an inherent switch action time sequence of a to-be-analyzed system, creating a corresponding external control instruction set according to an external input signal, and simulating the system model based on the instruction action sequence and the external control instruction set. State paths under all instruction actions and control instructions are obtained, and finally potential paths are found out; according to the technical scheme, from the perspective of the actual working condition and the operation time sequence of the system, full-task-cycle analysis can be carried out on the system in a state path mode, and the comprehensiveness and the accuracy of potential path analysis are improved.

Description

Technical Field

[0001] The present application relates to the technical field of universal quality characteristic design, and in particular to a ship power system safety analysis method based on potential path analysis. Background Art

[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 high degree of professionalism of the network tree and clue table technology, it has not been widely promoted and has only been used in a very small number of key aerospace projects such as the Apollo spacecraft and Skylab.

[0003] In view of the fact that professional analysis units at home and abroad have encountered the problem of being unable to provide technical services only through professional institutions to meet the needs of technology popularization and application, the current potential pathway analysis technology has shown two development trends: 1) After having comprehensive design and manufacturing data, professional scientific research institutions will implement comprehensive potential pathway analysis work, and continuously expand the application of technology in product scope and depth; 2) In the early stage of design, designers will simultaneously carry out potential pathway analysis based on design principle data, and make the application of technology easier for ordinary designers to accept and master in terms of convenience and flexibility.

[0004] At present, the main research method is the classic network tree analysis method. The network tree analysis method is based on the system network tree, identifies and analyzes its typical topological structure, and then combines the topological pattern analysis clue table to analyze whether each network tree has a potential state. The specific analysis steps are: 1) Identify the topological structure of the network tree and determine the typical topological structure contained in each network tree; 2) Apply the basic pattern clue table to analyze each circuit topological structure pattern identified in the network tree.

[0005] Using the classic network tree analysis method to analyze potential circuits requires designers to comb the topology in addition to auxiliary analysis tools, which is a huge workload. Moreover, the scope of analysis is mostly local functional circuits, and the analysis is not comprehensive enough. Compared with the aerospace field, the ship power system has the characteristics of complex grid structure and multiple operating states of major equipment. The use of the classic network tree analysis method to carry out potential path analysis has the following disadvantages: 1) The number of equipment and circuits is huge, and the workload of manually combing the topology structure of each network tree is huge, which is time-consuming and labor-intensive; 2) In complex ship power systems, potential paths are often exposed only in dynamic states. The classic network tree analysis method focuses more on the static structure of the system, and the analysis of current paths and signal paths in various operating states of complex ship power systems is insufficient, making it difficult to effectively simulate the dynamic behavior of the system under different operating states; 3) The operating conditions of ship power systems are changeable, and the operating states of different equipment are also extremely complex. The classic network tree analysis method is difficult to accurately analyze the power-on state of each device in detail. Summary of the invention

[0006] The purpose of this application is to provide a potential path analysis method for a ship power system, abstract the devices with switch properties in the system into models with on-off control and action delay properties, track all current paths according to the system timing action parameters and external control instructions, simulate the actual operating state of the system, and during the simulation process, search and cover every timing state of the entire system to identify potential paths of the system.

[0007] The technical solution of the present application is to provide a ship power system safety analysis method 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, and establish the model of each device of the system to be analyzed in the latent path analysis software according to the design principle data, wherein, for the device with switch properties, its on-off control parameters and action delay parameters are modified to predetermined parameters;

[0009] Step 2, according to the design principle data, the models of each device in the system to be analyzed are connected by latent path analysis software to form a model of the system to be analyzed;

[0010] Step 3, creating a corresponding instruction action sequence according to the inherent switch action of the system to be analyzed, setting the timing of each instruction action according to the sequence of the inherent switch action, creating a corresponding external control instruction set according to the external input signal of the system to be analyzed, and defining the instruction action sequence and the external control instruction set in the latent path analysis software respectively;

[0011] Step 4, based on the instruction action sequence, perform instruction action timing simulation on the system model to be analyzed to obtain the state path under all instruction actions, based on the external control instruction set, perform control instruction simulation on the system model to be analyzed to 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 of the current from the starting point to the end point is taken as the state path.

[0012] Furthermore, step 1 specifically includes: the design principle data includes a design schematic diagram and a component list. For devices with switching attributes in the component list, a model with corresponding function is selected as the device model in the basic component library of the latent path analysis software according to its switching attributes, and the on-off control parameters and action delay parameters of the device model are modified to predetermined parameters so that its on-off control and action delay are consistent with the device itself. For the remaining devices without switching attributes in the component list, the corresponding models are directly selected as the device models in the basic component library of the latent path analysis software.

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

[0014] Step 2.1, dividing the system to be analyzed into different functional modules according to its overall functions, finding the device models corresponding to each functional module according to the division results, and setting the device models belonging to the same functional module in a 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 according to the connectivity data;

[0016] Step 2.3, connecting the device models according to the connection relationship between different devices to form models of different functional modules, and connecting 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 device models in the system model to be analyzed, the connection relationships of the device models, and the signal transmission paths between different functional modules, and correct the wrong locations.

[0018] Furthermore, step 3 specifically includes: creating a command action sequence of the device model in the system to be analyzed according to the inherent switching action of the device in the system to be analyzed, and setting the timing of each command action according to the order of the inherent switching action, and defining the corresponding device model and command action sequence in the simulation analysis part of the latent path analysis software, wherein the action sequences corresponding to different device models are arranged according to a known timing sequence, and creating an external control instruction set corresponding to the system model to be analyzed according to the external input signal of the system to be analyzed, and defining the external control instruction set in the simulation analysis part of the latent path analysis software.

[0019] Furthermore, in step 4, instruction action timing simulation is performed on the system model to be analyzed based on the instruction action sequence, specifically including: in the simulation analysis part of the latent path analysis software, the system model to be analyzed is simulated in sequence according to the timing of different instruction actions in the instruction action sequence, so that the system model to be analyzed executes each instruction action according to the timing, and after the instruction action is turned on, the path from the starting point to the end point of the current is traced to obtain the state path under all instruction actions, and 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, and the latent path analysis software displays the traced path.

[0020] Furthermore, in step 4, control instruction simulation is performed on the system model to be analyzed based on the external control instruction set, specifically including: in the simulation analysis part of the latent path analysis software, individual external control instructions in the external control instruction set are simulated separately, so that the system model to be analyzed executes corresponding actions according to the external control instructions, and after the individual external control instructions are turned on, the path from the starting point to the end point of the current is traced to obtain the state path under all instruction actions, and 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, and the latent path analysis software displays the traced path.

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

[0022] The beneficial effects of this application are:

[0023] The technical solution in the present application equates the device with switch properties in the system to a model with on-off control and action delay properties, obtains the state path of the whole system by analyzing the command action timing and control command of the system, and finds out the potential path through the state path. Compared with the existing method, the state path analysis method of the technical solution in the present application can realize the path tracking and module boundary division in the existing method, and can analyze the whole task cycle of the system from the perspective of the actual working condition and operation timing of the system. The technical solution in the present application analyzes and displays the current path in the system in the form of a state path, and the analysis scope fully covers the entire ship power system, which can improve the comprehensiveness and accuracy of the potential path analysis of the ship power system and avoid missing some potential problems or hidden dangers.

[0024] The technical solution in the present application can cover every timing state of the entire system and the state analysis process under different control instructions for state path analysis, and can more intuitively display each operating state of the entire system process. At the same time, for some special operating states, local simulation analysis can be achieved through different control instructions. The technical solution in the present 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1is a schematic flow chart of a method for analyzing the safety of a ship power system based on potential path analysis according to an embodiment of the present application;

[0027] Figure 2 It is a device model library of the system to be analyzed according to the example in this application and the equivalent models corresponding to the devices;

[0028] Figure 3 It is a functional module modeled according to the device connectivity of the example in this application;

[0029] Figure 4 is a system model modeled according to the system connectivity of the example in this application;

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

[0031] Figure 6 It is a simulation diagram under full instruction action according to the example in this application;

[0032] Figure 7 This is a simulation diagram under the control of a single instruction according to the example in this application. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

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

[0035] The sneak circuit analysis software used in the method of the present invention is the power system sneak circuit analysis software (ZCSCA, ZhongCheng Sneak Circuit Analysis) V1.0, which integrates functions such as system modeling, simulation configuration, virtual operating console and analysis result output, and is suitable for fields such as aerospace, rail transportation, etc. that require high reliability design.

[0036] like Figure 1As shown, this embodiment provides a method for analyzing the safety of a ship power system based on potential path analysis, including: step 1, retrieving the design principle data of the system to be analyzed from a database, and establishing models of each component of the system to be analyzed in a potential path analysis software according to the design principle data, wherein, for devices with switch properties, 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 power system database. The design principle data includes the design schematic diagram and the component list. Based on the design principle data, the design understanding of the system to be analyzed is carried out to clarify its design requirements and working principles, so as to facilitate the subsequent accurate modeling and simulation analysis of the entire system to be analyzed.

[0038] For devices with switch attributes in the component list, a model with corresponding functions is selected as the device model in the basic device library of the latent path analysis software according to its switch attributes, and the on-off control parameters and action delay parameters of the device model are modified to make its on-off control and action delay consistent with the device itself. For the remaining devices without switch attributes in the component list, the corresponding model is directly selected as the device model in the basic device library of the latent path analysis software; specifically, the predetermined parameters of on-off control can be set according to the on-condition (on-signal, i.e., the signal threshold) and off-condition (off-signal and the signal threshold) of the device, and the predetermined parameters of action delay can be set according to the on-delay (the time required for the switch to actually turn on from receiving the on-signal), the off-delay, the rise time (the time it takes for the switch to transition from the off state to the fully on state), and the fall time of the device. In the latent path analysis software, the off-control parameters and action delay parameters of the device model are defined, and the initial values ​​are changed to the predetermined parameter values.

[0039] It should be noted that the basic device library contains models of all devices in the system to be analyzed. For devices with switching properties, such as the modeling of semiconductor field effect transistors MOSFET, MOSFET components can be selected in the basic device library, and the gate drive voltage, on-resistance, switch control signal, turn-on delay time, turn-off delay time and other parameters can be modified according to the data listed in the component list, so that the on-off control and action delay of the MOSFET model in dynamic simulation are consistent with the device itself, and the MOSFET model is verified; for the remaining devices that do not have switching properties, such as the modeling of resistors, resistor components can be selected in the basic device library, and their resistance values ​​can be modified according to the resistor data listed in the component list.

[0040] In this embodiment, the devices with switch properties in the component list are equivalent to models with on-off control and action delay properties, so that the behavior of the devices in different states can be simulated more accurately during analysis to reflect the real characteristics of the system to be analyzed.

[0041] In this embodiment, the component list lists all components used in the system to be analyzed and their related attributes, and the related attributes include device name, model, specification, quantity, etc.; the switch attribute refers to the switching function of the device, that is, the ability of the device to switch between the on and off states under the action of an external control signal. The switch attributes include on-off control (that is, 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: Connect the models of each device in the system to be analyzed through latent path analysis software according to the design principle data to form a model of the system to be analyzed, which specifically includes the following steps:

[0043] Step 2.1, dividing the system to be analyzed into different functional modules according to its overall functions, finding the device models corresponding to each functional module according to the division results, and setting the device models belonging to the same functional module in a predetermined area of ​​the functional module;

[0044] In this embodiment, it is necessary to divide the system to be analyzed into functional modules with simple structure, easy analysis and small area according to the function and electrical connection relationship, so that there is no complex electrical connection between the divided functional modules, and different functional modules can independently complete the predetermined tasks after receiving the predetermined trigger signal. The divided system to be analyzed is convenient for subsequent simulation analysis, and is easy to understand and debug. The input and output of specific modules are detected, and problems can be quickly discovered and solved to improve efficiency. For example, a signal processing system is divided into functional modules such as signal acquisition module, signal preprocessing module, filtering module, signal conversion module, feature extraction module, signal compression module, classification and decision module (signal classification or identification, output control instructions according to signal classification or identification results), output and display module; in this embodiment, in addition to the division according to function and electrical connection, the system to be analyzed can also be divided according to actual needs, such as using power supply points, power supply buses (positive buses) of various levels, power supply return buses (negative buses) of various levels, power return points, centralized grounding points, command signal buses, special function nodes, etc. 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 according to the connectivity data;

[0046] Step 2.3, connecting the device models according to the connection relationship between different devices to form models of different functional modules, and connecting 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 between different devices and the signal transmission paths between different functional modules.

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

[0049] In this embodiment, the connected system model to be analyzed needs to be checked according to the component list and connectivity data. The check content specifically includes the uniqueness and consistency of the device model name and the name of the device connection, the consistency of the device 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 identification.

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

[0051] Step 3, create a corresponding instruction action sequence according to the inherent switching action of the system to be analyzed, set the timing of each instruction action according to the order of the inherent switching action, create a 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 latent path analysis software respectively.

[0052] According to the inherent switch 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 (referring to a series of commands executed in a specific order, each instruction action represents a specific operation step, and the system can achieve the expected function only when these steps are completed in order), and the timing of each instruction action is set according to the order of the inherent switch action, and the corresponding device model and instruction action sequence are defined in the simulation analysis part of the latent path analysis software. Specifically, the corresponding device model name is defined in the action device column of the action sequence configuration module in the latent path analysis software, and the instruction action sequence is defined in the action name column of the action sequence configuration module, wherein the action sequences corresponding to different device models are arranged according to the known timing. According to the external input signal of the system to be analyzed, the external control instruction set corresponding to 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. Specifically, the external control instruction set is defined in the instruction console of the latent path analysis software, and different external control instructions are associated with the buttons of the instruction console, so that the input of the external control instruction is realized in the form of button operation.

[0053] Step 4, based on the instruction action sequence, perform instruction action timing simulation on the system model to be analyzed to obtain the state path under all instruction actions, based on the external control instruction set, perform control instruction simulation on the system model to be analyzed to 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 of the current from the starting point to the end point is taken as the state path.

[0054] For the instruction action timing simulation of the system model to be analyzed, in the simulation analysis part of the latent path analysis software, the system model to be analyzed is simulated in sequence according to the timing of different instruction actions in the instruction action sequence, so that the system model to be analyzed executes each instruction action according to the timing. After the instruction action is turned on, the path from the starting point to the end point of the current is traced to obtain the state path under all instruction actions, and 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; specifically, the latent path analysis software starts the instruction action sequence defined in the action sequence configuration module according to the set timing, so that the system model to be analyzed executes each instruction action according to the timing, the latent path analysis software starts the path tracing from the starting point of the current, and ends the path tracing after reaching the end point of the current, so as to obtain the state path under all instruction actions, and the latent path analysis software displays the traced path.

[0055] In this embodiment, for a system model to be analyzed with a large number of instruction actions, the instruction actions of the same category can be merged according to their types, and after merging, one of the instruction actions is selected for simulation analysis. This can simplify the simulation steps, improve efficiency, and reduce the waste of computing resources.

[0056] For the control instruction simulation of the system model to be analyzed, in the simulation analysis part of the latent path analysis software, a single external control instruction in the external control instruction set is simulated separately, so that the system model to be analyzed performs corresponding actions according to the external control instructions. After a single external control instruction is turned on, the path from the starting point to the end point of the current is also traced to obtain the state path under all instruction actions, and 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; specifically, the external control instructions in the external control instruction set are turned on in sequence through the corresponding buttons in the instruction console of the latent path analysis software, and one external control instruction is turned on each time. The system model to be analyzed performs corresponding actions according to the external control instructions. The latent path analysis software starts path tracing from the starting point of the current and ends the path tracing after reaching the end point of the current, and finally obtains the state path under all external control instructions. The latent path analysis software displays the traced path.

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

[0058] Example: Take the DC shore power switch and battery switch board as the system to be analyzed, and model and simulate the system composed of the DC shore power switch and battery switch board according to the method of 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, and the circuit breaker in the system to be analyzed is equivalently modeled as a model with on-off control and action delay properties. The device model library of the system to be analyzed is as follows: Figure 2 As shown;

[0060] After the device modeling is completed, the various device models are connected according to the connectivity data of the system to be analyzed to form a model of the entire system to be analyzed. The system to be analyzed can be divided into two functional modules, the DC shore power switch and the battery switch board, according to the function. The various device models are connected according to the connectivity data (here the functional module can be regarded as a device, and the device modeling is performed by connecting the device models in the functional module). After the modeling is completed, Figure 3As shown, the two functional modules are connected into a system according to the signal transmission relationship (i.e., the entire system is modeled), as shown in Figure 4 As shown;

[0061] After the modeling is completed, switch to the simulation module and perform simulation analysis and verification on the system to be analyzed through the full action sequence simulation mode. The action sequence settings are as follows: Figure 5 As shown, the simulation state path of the full action sequence is as follows Figure 6 As shown, the red mark in the model of the system to be analyzed represents the path through which current flows, and the green mark represents the voltage.

[0062] Perform simulation analysis and verification based on the set command console. Determine whether there is a potential path in the circuit based on the power-on status of each component under a single instruction. The red button in the command console is the triggered simulation state, and the blue button is the untriggered simulation state. The specific simulation state path of the command console is as follows: Figure 7 shown.

[0063] Through the above-mentioned two methods of action sequence simulation and command control simulation, all current paths of the system composed of the DC shore power switch and the battery switch board were traversed and simulated. The simulation results were compared and analyzed with the predetermined expected paths. No potential paths and fault locations were found, indicating that all current paths in the system met expectations. It was preliminarily judged that the system was reliable and stable in actual operation.

[0064] The steps in this application can be adjusted in order, combined, and deleted according to actual needs.

[0065] The units in the device of the present application can be combined, divided and deleted according to actual needs.

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

Claims

1. A ship power system safety analysis method based on potential path analysis, characterized in that: The method includes: 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 latent path analysis software according to the design principle data, wherein, for the device with switch properties, its on-off control parameters and action delay parameters are modified to predetermined parameters; Step 2, according to the design principle data, connecting the models of various components in the system to be analyzed through latent path analysis software to form a model of the system to be analyzed; Step 3, creating a corresponding instruction action sequence according to the inherent switch action of the system to be analyzed, setting the timing of each instruction action according to the sequence of the inherent switch action, creating a corresponding external control instruction set according to the external input signal of the system to be analyzed, and defining the instruction action sequence and the external control instruction set in the latent path analysis software respectively; Step 4: Based on the instruction action sequence, the instruction action timing simulation is performed on the system model to be analyzed to obtain the state path under all instruction actions; based on the external control instruction set, the control instruction simulation is performed on the system model to be analyzed to obtain the state path under different external control instructions; the state path is compared with the predetermined expected path to find out the potential path that does not exist in the expected path, wherein the path of the current from the starting point to the end point is taken as the state path.

2. The ship power system safety analysis method based on potential path analysis according to claim 1 is characterized in that: The step 1 specifically includes: The design principle data includes a design schematic diagram and a component list. For devices with switching properties in the component list, a model with corresponding functions is selected from the basic component library of the latent path analysis software as the device model according to its switching properties, and the on-off control parameters and action delay parameters of the device model are modified to predetermined parameters so that its on-off control and action delay are consistent with the device itself. For the remaining devices without switching properties in the component list, the corresponding models are directly selected from the basic component library of the latent path analysis software as the device model.

3. The ship power system safety analysis method based on potential path analysis according to claim 2 is characterized in that: The step 2 specifically includes the following steps: Step 2.1, dividing the system to be analyzed into different functional modules according to its overall functions, finding the device models corresponding to each functional module according to the division results, and setting the device models belonging to the same functional module in a 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 in the system to be analyzed according to the connectivity data; Step 2.3, connecting the device models according to the connection relationship between different devices to form models of different functional modules, and connecting 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; Step 2.4, based on the component list and connectivity data, check the names of the device models in the system model to be analyzed, the connection relationships of the device models, and the signal transmission paths between different functional modules, and correct the wrong locations.

4. The ship power system safety analysis method based on potential path analysis according to claim 3 is characterized in that: The step 3 specifically includes: According to the inherent switching actions of the devices in the system to be analyzed, a command action sequence of the device model in the system model to be analyzed is created, and the timing of each command action is set according to the order of the inherent switching actions. The corresponding device model and the command 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 timing. According to the external input signal of the system to be analyzed, an external control instruction set corresponding to 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 ship power system safety analysis method based on potential path analysis according to claim 4 is characterized in that: In step 4, the instruction action timing simulation is performed on the system model to be analyzed based on the instruction action sequence, specifically including: In the simulation analysis part of the latent path analysis software, the system model to be analyzed is simulated in sequence according to the timing of different instruction actions in the instruction action sequence, so that the system model to be analyzed executes each instruction action according to the timing. After the instruction action is turned on, the path from the starting point to the end point of the current is traced to obtain the state path under all instruction actions. According to the distribution of the state path, the power-on status of each device model in the system model to be analyzed is obtained, and the latent path analysis software displays the traced path.

6. The ship power system safety analysis method based on potential path analysis according to claim 5 is characterized in that: In step 4, control instruction simulation is performed on the system model to be analyzed based on the external control instruction set, specifically including: In the simulation analysis part of the latent path analysis software, each external control instruction in the external control instruction set is simulated separately, so that the system model to be analyzed performs corresponding actions according to the external control instructions. After a single external control instruction is turned on, the path from the starting point to the end point of the current is traced to obtain the state path under all instruction actions. According to the distribution of the state path, the power-on status of each device model in the system model to be analyzed is obtained, and the latent path analysis software displays the traced path.

7. The ship power system safety analysis method based on potential path analysis according to claim 6 is characterized in that: The step 4 also includes: Compare all state paths obtained from the simulation with the predetermined expected paths, find out the paths that do not exist in the expected paths as potential paths, compare the power-on conditions of each device model with the power-on conditions of each device in the expected path, find out the locations with inconsistent power-on conditions as fault locations, and summarize and record the data of potential paths and fault locations.

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