Research On Hydrogen Production System Of Wind-Solar Complementary Power Generation

Environmental protection is a basic national policy in China.As renewable energy,wind and solar energy are widely distributed.The development and utilization of them can achieve the effect of optimizing the energy structure to a certain extent.At the same time,as a clean energy,hydrogen energy is regarded as the most ideal energy carrier and energy storage mode.At present,the research on wind-solar complementary power generation hydrogen storage system has become a hot spot,and the allocation of appropriate capacity energy storage system to control the fluctuation of wind-solar complementary power generation and improve the efficiency of electrolysis water hydrogen production have become the focus of the system research.Based on the existing wind-solar complementary power generation energy storage control system as the starting point,combined with the research of electrolysis water hydrogen generation system,this paper carried out theoretical analysis on the various parts of wind-solar complementary power generation energy storage and hydrogen generation system,including photovoltaic modules,wind power generation modules,battery packs,electrolysis cells,supporting controllers and inverters,and constructed a mathematical model.The photovoltaic power generation system MPPT Simulink model based on the perturbation observation method,the local shadow photovoltaic power generation system MPPT Simulink model based on the particle swarm algorithm,the direct wind power system MPPT Simulink model based on the variable step perturbation observation method,and the electrolysis water hydrogen generation system Simulink model are established.Using the model of factors that influence efficiency of hydrogen production system including local shadow light radiation,wind speed,photovoltaic cells and electrolysis of water temperature to simulate orthogonal experiment,the experimental results are very poor,variance analysis,the analysis results show that the primary and secondary factors influence on the system's efficiency of hydrogen production by importance from high to low order followed by light radiation,wind speed,total cell temperature and photovoltaic battery partial shadow.Then,the Simulink model of the battery energy storage system based on three-phase charging was established,and the total amount of light radiation and wind speed were changed to simulate the operation of the hydrogen generationsystem of wind-solar complementary power generation.The results showed that the hydrogen generation rate of the system was less affected by the total amount of light radiation and wind speed.Hydrogen production efficiency of the system is higher.Finally,a prototype of wind-solar complementary power generation hydrogen generation system in handan city,hebei province,was used to carry out experimental research on the system and compared with the operating results of the simulation model.Through experiments and simulation analysis,it is concluded that the fluctuation of wind-solar complementary power generation can be stabilized by the configuration of energy storage system,and stable electric energy can be output to electrolyze water for hydrogen production,thus improving the efficiency of hydrogen production.When the wind and solar energy resources are insufficient,the system can discharge itself through the battery energy storage equipment,which can meet the maximum working time of the electrolytic cell for 3 days.The model established in this paper is used to input wind and solar energy resources,environmental factors,load power and other parameters in different regions.By changing the battery capacity and observing the battery operation and dc bus output,the battery equipment suitable for the whole system can be selected.