Simulation And Optimization Of Hydrogen Production System Based On Renewable Energy

Based on the concept of sustainable development,to promote the development and application of renewable energy,enhance the capacity of renewable energy consumption,this thesis investigates the renewable energy hydrogen production system,applying renewable energy to generate electricity and converting electricity into hydrogen for different loads.The basic workflow and classification of the renewable energy hydrogen production system are introduced,and the applicability and reliability of modelling renewable energy hydrogen production systems or components using TRNSYS and HOMER software is illustrated.Based on the working principle of each component of the renewable energy hydrogen production system,mathematical models of photovoltaic(PV),wind turbine(WT),electrolysis,hydrogen storage tank and fuel cell(FC)are established.TRNSYS software is applied to simulate each component of the renewable energy hydrogen production system to study the influence of different operating parameters of the system on the output performance(voltage or power)of components.Taking Kuqa,Xinjiang as the study site and applying solar and wind energy,six different scenarios of hydrogen production systems are designed according to on-grid and off-grid renewable energy hydrogen production systems,including: on-grid and off-grid PV hydrogen production systems,on-grid and off-grid PV/FC hydrogen production systems,on-grid and off-grid WT hydrogen production systems,on-grid and off-grid WT/FC hydrogen production systems,on-grid and off-grid PV/WT hydrogen production systems and on-grid and off-grid PV/WT/FC hydrogen production systems.Six different scenarios of on-grid and off-grid renewable energy hydrogen production systems are compared and analyzed from the economic and technical points of view to select the optimal scenarios of on-grid and off-grid renewable energy hydrogen production systems using HOMER software.The operating status of component of the on-grid PV/WT and off-grid PV/WT/FC hydrogen production systems are analyzed,and the key factors affecting the degree of grid dependency and the excess electricity rate of the on-grid PV/WT and off-grid PV/WT/FC hydrogen production systems are analyzed in terms of load’s data and component sizing,to determine the best suitable load data and component sizing for the on-grid PV/WT and off-grid PV/WT/FC hydrogen production systems and reduce the degree of grid dependency of the on-grid hydrogen production system and the excess electricity rate of the off-grid hydrogen production system.The optimal off-grid renewable energy hydrogen production system is applied to the hydrogen refueling station,and the component sizing of the station are determined through the economic and technical analysis.Focusing on the safety of renewable energy hydrogen refueling stations,heat transfer models for hydrogen fuel cell vehicles are developed and the analytical solutions of hydrogen temperature are derived to predict hydrogen temperature during hydrogen refueling.Taking Kuqa,Xinjiang as the study site,this thesis focuses on the scenarios design and selection,parameter optimization and application of the on-grid and offgrid renewable energy hydrogen production systems to improve the utilization of renewable energy,provide a theoretical basis for the development and application of renewable energy and data support and theoretical guidance for the demonstration application of renewable energy hydrogen production systems.