Research On Joint Optimization Method Of Marine Composite Power Supply Parameters And Energy Management Strategy

As the energy and environment problems become more and more serious,the application of clean energy in the field of ship gradually attracts people’s attention.Simple clean energy power system has poor ability to resist external interference.Composite power system composed of clean energy and composite energy storage system is an effective technical means to solve this problem.The parameter configuration and energy management strategy of the composite power supply directly affect its comprehensive performance,so it is urgent to further study how to scientifically and rationally coordinate the optimization of the parameters and energy management strategy of the composite power supply and find the optimization method to optimize its comprehensive performance.Based on this,this paper takes "Alsterwasser" fuel cell ship as the research object,focusing on the combined optimization method of composite power parameters and energy management strategy with total cost,power quality and energy loss as the optimization objective.The specific research contents are as follows:Firstly,by studying the advantages and disadvantages of several common composite power topologies,the composite power topologies and operation modes suitable for clean energy powered ships are determined.Then the main components of the composite power system(fuel cells,battery,super capacitor and two-way DC-DC converter)work characteristics and modeling methods are studied,constructed the simulation model of composite power supply module and the accuracy of the model are verified,the composite power supply control system for subsequent structures,laid the foundation of the model.Based on the simulation model of each module of the composite power supply,the simulation model of the composite power supply energy management control system was built,and the comprehensive control effect of three energy management strategies based on state machine control,classical PI control and equivalent fuel consumption minimization control was studied.Simulation results show that the control strategy based on state machine has the best suppression effect of DC bus voltage fluctuation.The control strategy based on classical PI has the best suppression effect of fuel cell power fluctuation.The control strategy based on equivalent fuel minimization has the lowest battery energy consumption.In order to reduce the fluctuation of bus voltage and improve the stability of ship power system,the energy management control strategy based on state machine control is adopted in this study.Based on the above study,based on the total cost of the composite power supply,power quality and energy loss as the optimization goal,with a compound power capacity configuration parameters and energy management control model parameters as optimization variables,such as voltage,power restriction as constraint condition is constructed based on the composite power supply parameters of reptiles search optimization algorithm with double joint energy management control strategy optimization model,The outer layer is a compound power supply parameter optimization model and the inner layer is an energy management optimization control model based on state machine control.The simulation results show that the combined optimization of composite power supply parameters and energy management control strategy has a good effect on improving the comprehensive performance index(stability,reliability and economy)of clean energy powered ships.Finally,a d SPACE-based hardware-in-loop simulation platform for composite power supply was built to verify the joint optimization effect of Marine composite power supply parameters and energy management control strategy proposed in this paper.The experimental results verify the effectiveness and feasibility of the proposed method.