| Currently,global energy is in the process of transformation.As a secondary energy source,hydrogen energy has advantages such as diverse sources,convenient storage and transportation,and wide application.Therefore,hydrogen energy can promote the development of existing energy systems towards a newer and more optimized direction.Among various hydrogen electric fuel cells,solid oxide fuel cells(SOFCs)have the highest efficiency in converting hydrogen directly into electrical energy,and are one of the cleanest ways to generate electricity due to their low greenhouse gas emissions.The biggest problem in SOEC and SOFC is the cost problem caused by the high temperature environment required by SOEC when electrolyzing water to produce hydrogen.SOEC electrolyzed water requires both electricity and heat.Considering that photovoltaic photothermal power generation has a high light rejection rate,photovoltaic power generation has a high light rejection rate.If discarded light is to continue to be utilized,photovoltaic power stations will emit excess electrical energy,while photothermal power stations will store excess heat.The sufficient electricity and high temperature waste heat generated by using photovoltaic photothermal waste light can just meet the relatively stringent requirements of SOEC for hydrogen production by electrolysis of water.The photovoltaic photothermal waste light is converted into hydrogen energy through SOEC electrolysis of water,and stored.When photovoltaic photothermal power generation cannot meet the user side load due to intermittent conditions,SOFC fuel cells are used to burn hydrogen to generate electricity to meet the power demand.Through literature review,it is found that in 2017,Lv Zewei and Han Minfang of Tsinghua University proposed and constructed a complementary scheme that combines photothermal steam generation,photovoltaic power generation,SOEC electrolytic water hydrogen generation,and SOFC power generation,which coincides with the conceptual scheme in this article.The difference lies in whether photothermal power stations are allowed to participate in power generation,and detailed scheme planning,numerical calculation,and feasibility analysis have not been carried out based on the actual situation.Therefore,after determining the system,this article further analyzes the system operation.Firstly,this article sets the capacity of the entire setting system,determines the selection of limited photothermal power plants based on the actual scale of users,and then determines the appropriate capacity of photovoltaic power plants based on the assumed scale of photovoltaic power plants.In addition,through literature review,capacity standards for heat storage tanks and hydrogen storage tanks are obtained,and capacity design is conducted to ensure that the entire capacity design conforms to reality and can be used to evaluate the performance of different systems.After determining the capacity settings,in order to compare the performance of different systems,it is determined to use the amount of light discarded and energy efficiency as the thermal performance evaluation indicators,and the thermal and hydrogen storage capacity limits,flow limits,and actual conditions as a series of constraints.Finally,particle swarm optimization is used to convert the operation strategy problem into a problem of using particle swarm optimization to find the maximum and minimum values,and then a more reasonable optimization scheme is obtained under this system.Finally,the optimized operation scheme of the system will be obtained,and the performance of other systems under the same scheme optimization will be compared to analyze the advantages of setting system performance.At the same time,under the same system,compare the different performance of different typical daily systems,speculate on the possible influencing factors of system performance,and on this basis,conduct a comparative analysis to analyze the impact of solar lighting conditions and other energy storage capacities of the system,that is,the capacity of heat storage tanks,on system performance. |
