Research On Risk Assessment Technology Of Ship Integrated Power System

With the rapid development of power systems and power electronics,the ship’s Integrated Power System is gradually replacing the traditional ship power system with its advantages such as higher operating efficiency,better maneuverability,and better concealment.And has becoming a main research direction of ships.Because of the combination of power system and propulsion system,the impact of Integrated Power System on ship’s safety is increasing.Therefore,effective risk assessment of the ship’s integrated power system has become an important guarantee for ship safety and reliability.This paper takes the US DDG-1000 destroyer as the research object,and proposes a risk assessment method for the ship’s Integrated Power System.Based on the component failure model,this method builds a unit failure model through component connection relationships and FDAHP.Based on the simplification of the overall electrical structure of the system,a node-branch model of the ship’s Integrated Power System that is easy to calculate and analyze is established,and the electrical parameters and risk parameters of the nodes and branches are given.Finally,by combining optimal power flow analysis and non-sequential Monte Carlo simulation,the risk assessment of the ship’s integrated power system is completed..The key research contents of this article are as follows:(1)Through in-depth research on land power risk assessment and ship’s Integrated Power System risk assessment research status,existing problems,and key technologies involved,the research concept of “component-unit-system” is determined,and the entire paper is constructed.The research framework and research goals provide the direction for theoretical research later.(2)In accordance with the research ideas,this article explores the risk assessment modeling methods of components,units and systems in detail.By categorizing component and unit failure types,connection methods,and impact on the system,the component and unit failure model building methods in different scenarios are discussed separately;through the research and discussion of state enumeration method,sequential Monte Carlo simulation and non-sequential Monte Carlo simulation,the state simulation scheme of the ship’s integrated power system is selected.(3)Establish components’ failure model of the ship’s integrated power system.By combining the system architecture of the ship’s integrated power system,the ship’s integrated power system is divided into different units according to functions.;By combing the component failure model and the connection methods of key components,as well as using the analytic hierarchy process to perform weighted calculations,the failure models of the power generation unit,energy storage unit,load unit and propulsion unit of the ship’s integrated power system were built separately.(4)Combining the actual power system architecture of the DDG-1000 destroyer,simplifying the ship’s Integrated Power System,and by combining the unit failure model,the ship’s integrated power system structure is simplified into a node-branch model suitable for electrical analysis and calculation.;and this paper calculated the electrical parameters and risk parameters of nodes and branches.(5)The risk assessment process of the ship’s integrated power system is studied.Based on this,the power flow analysis method of the ship’s integrated power system under the failure mode of some nodes or branches is studied,and the optimal power flow model is given.Results of load flow analysis under normal and failure conditions are shown.After that,according to the target operation mode,a system risk assessment grading strategy and evaluation indicators are proposed.By combining the power flow analysis results and non-sequential Monte Carlo simulation,the system status is simulated and calculated to obtain the risk assessment results.The method proposed in this paper mainly depends on the component reliability data of the ship’s integrated power system.It is not limited to the specific power system structure.In practical applications,the unit failure model and system node-branch model can be performed according to the connection type of the actual power system.The simplified system model has a clear structure and it is easy to calculation.Combining power flow analysis and non-sequential Monte Carlo simulation,it is possible to more easily and comprehensively simulate and calculate the failure status of the ship’s integrated power system,and finally give the risk assessment results.So the assessment method proposed by this paper has a certain practical value.