Research On The Capacity Configuration And Operation Of Electric-Hydrogen Energy Station For New Energy Vehicles

The utilization of new energy vehicles,such as electric vehicles and hydrogen fuel-cell vehicles,can enhance the green and low-carbon transformation of the transportation and achieve the carbon peaking and carbon neutrality goals effectively.The promotion of new energy vehicles depends on the convenience of energy supply.Reasonable or even advanced layout of infrastructure service facilities for new energy vehicles is important to meet the trend of low-carbon and clean vehicles.The planning and construction of electric-hydrogen energy station for new energy vehicles,including PV system,hydrogen storage system,charging and switching facilities and hydrogen refueling facilities,can not only meet the demands of electric vehicles charging and switching and hydrogen refueling services,but also improve the utilization rate of distributed clean energy and the economy and reliability of energy supply.Taking the electric-hydrogen energy station for new energy vehicles as the research object,this thesis focuses on the capacity configuration and optimal operation of the energy station under the premise of source-load uncertainty.The main researches are as follows:First,a general architecture of the electric-hydrogen energy station for new energy vehicles was designed,and the principle of the energy station was elaborated.The principles of PV system,electrolytic hydrogen production system,hydrogen storage system,fuel cell power plant and other component units in the energy station were analyzed and their mathematical models were established.On this basis,the energy flow of electricity and hydrogen and the energy balance relationship in the energy station were investigated to lay the foundation for further research work.Second,for the optimal allocation of electric-hydrogen energy station equipment capacity,fuzzy variables were adopted to characterize the uncertainty of PV output and load from both source and load aspects.A model of optimal allocation of electric-hydrogen energy station capacity considering source-load uncertainty based on fuzzy chance constrained programming was constructed.To improve the model solving efficiency,the model was converted into a mixed integer linear programming model by piecewise linearization of the nonlinear constraints.The results of the example show that the model can make full use of the PV output and meet the demand of various loads through flexible electro-hydrogen coupling,and also reduce the annualized comprehensive cost of the energy station.Third,for the optimal operation of electric-hydrogen energy station,a multi-time scale fuzzy optimal operation model including day-ahead optimal operation model and intraday rolling optimal operation model was constructed,according to the characteristics that the prediction accuracy of PV output and loads of energy station would continuously improve with the reduction of the time scale.By fuzzy representation of PV output and load forecast values,the traditional deterministic constraint model was transformed into a fuzzy chance constraint model,and the fuzzy confidence degree was set as an increasing vector to reflect the change of forecast accuracy.The results of the example show that the model can effectively decrease the impact of PV output and load prediction errors on the operation of energy station,improve the ability of energy station to consume clean energy,and enhance the economy and reliability of energy station operation.