Modeling And Energy Management Strategies Of Diesel-electric Hybrid Ship Propulsion System

Hybrid power system,using a variety of power sources to supply energy,has the advantages of flexible configuration,economy and environmental protection.Therefore,it has been widely concerned and applied in shipping.The energy management strategy(EMS)is an important factor affecting the performance of hybrid power system.Excellent EMS is the guarantee to optimize the energy distribution of each power source in the system,improve the system efficiency,and reduce energy consumption and emissions.For the diesel-electric hybrid ship propulsion system,the thesis conducts its modeling simulation analysis and energy management control technology.The specific research work is carried out as follows:Firstly,aiming at the series diesel-electric hybrid ship,several application topologies of diesel-electric hybrid ship are introduced,and the main operation modes of the ship are analyzed based on the operational characteristics of the target ship;The ship operating load system is studied,and the main components of the ship propulsion load are analyzed in detail;The operating characteristics of the propeller are mainly elaborated,and on this basis,a ship-to-propeller simulation model is built to simulate the typical operating conditions of the diesel-electric ship,such as starting,accelerating,decelerating and stopping.Secondly,based on the idea of modularization,the models of diesel generator,energy storage battery,power converter,equivalent load and other key components are built.Based on the working principle and control method of the converter,the simulation tests of the converter under steady state and dynamic conditions are completed.Finally,the simulation model of series diesel-electric hybrid ship propulsion system is built in the MATLAB/Simulink environment.In addition,according to the operational characteristics of the diesel-electric hybrid ship,the construction principle of ship energy management control strategy is analyzed in detail.On this basis,the basic energy management control strategy is constructed based on the principle of logical threshold.The energy management method based on fuzzy control is emphatically studied.Therefore,an EMS based on fuzzy control is designed,which takes ship running power and energy storage battery SOC as input variables and diesel engine reference output power as the output variable.Finally,the load simulation design of hybrid propulsion system in typical operating conditions is completed,and the verification and comparative analysis of two energy management strategies are carried out in the MATLAB/Simulink environment and the RT-LAB real-time simulation platform.98 figures,6 tables,62 references.