Parameter Matching And Energy Management Research Of Hydrogen Intercity EMU

The issue of energy has always been an important factor restricting the development of human society.Every change in human society cannot be separated from the development of energy.In today’s world,the development of new energy sources is imminent.Fuel cell hybrid locomotives that use hydrogen energy as the main power are environmentally friendly and low cost.They have gradually developed into a new type of rail transportation with great potential and have received widespread attention.The application of hydrogen energy to intercity EMUs and the use of fuel cells as the main power supply for EMUs has eliminated the line traction power supply system.It has great development potential and high flexibility in intercity transportation,providing new opportunities for the development of intercity transportation.In this paper,the CRH6-F intercity EMU is studied for parameter matching and energy management.The main work is as follows:Analyzing the advantages and disadvantages of each power source and the topology commonly used in hybrid systems,combined with the operating needs and characteristics of intercity EMU,it was finally determined that proton exchange membrane fuel cell(PEMFC)was used as the main power source,and lithium-ion battery as an auxiliary power source,and then establish a hybrid power system simulation model to provide a simulation platform for parameter matching and energy management.Based on CRH6-F intercity EMU parameters,combined with traction,braking characteristics,and operating route information,a dynamic model of the intercity EMU is established and operating conditions are calculated.Under the constraints of the axle load,space layout,dynamic performance indicators and other constraints of the intercity EMU,the feasible range of the preliminary parameter combination of the power source is determined.Establish a fuel cell life cycle model,consider the power source construction cost,replacement cost and maintenance cost,so as to obtain the parameter combination corresponding to the minimum total fuel cell life cycle cost,and finally determine the system parameter configuration scheme.Based on the parameter configuration of the hybrid power system,the energy management method is studied.The power analysis strategy of power following and the energy management strategy based on Pontryagin’s minimum principle are analyzed by simulation,and a dynamic programming energy management strategy considering fuel economy and durability is proposed.Compared with the power-following energy management strategy and the energy management strategy based on the Pontryagin’s minimum principle,it can be seen that the proposed method can improve the fuel cell economy while reducing the fuel cell voltage.The method improves the working life of the fuel cell,which verifies the effectiveness of the proposed energy management method.