Research On Design And Construction Of Hybrid Train Simulation Platform And Energy Optimization Management

With the continuous advancement of modern society,there is an increase in the demand for electricity in human society.According to the Statistical Communiqué of the People's Republic of China on Economic and Social Development published by the National Bureau of Statistics in China,although the use rate of clean energy in China is increasing year by year,until 2018,China's use of clean energy is still only 22.1%.with 77.9% of electricity supplied by non-clean energy combustion.It is known that the use of non-clean energy will produce a large number of greenhouse gases,which is very harmful to the maintenance of ecosystem on the earth.China's high-speed railway industry,as the most important business card to show China's scientific and technological strength,should also play an exemplary role in energy saving and emission reduction.Therefore,the research on energy management strategy of hybrid electric train has become an indispensable link.Moreover,if there is no good energy management strategy,the dynamic performance of the train will also be greatly affected.At present,there is no energy storage device with both high specific power and high specific energy.Therefore,at this stage,it is necessary to combine a power battery with high specific energy characteristics and a super capacitor with high specific power characteristics to form a power system of the hybrid train.The energy management strategy is to rationally distribute power of the power battery and super capacitor.This thesis focuses on hybrid trains,and the main contents are as follows:(1)According to the power system structure of hybrid electric train,the electrical characteristics of power battery,supercapacitor and bidirectional DC/DC in hybrid electric train energy storage system are analyzed.And based on the operation characteristics of hybrid electric train,the simulation platform of hybrid electric train is designed and built on MATLAB/Simulink.(2)Based on DSPACE,a semi-physical simulation model of hybrid train was designed and built.Due to the power battery model used in the MATLAB/Simulink-based simulation platform,the supercapacitor model and the DC/DC model are composed of ideal electrical components.In the semi-physical platform,the ideal model can be replaced by the real object,so that the test results will be closer to the actual vehicle data.(3)According to the operation characteristics of hybrid electric train,this paper matches the parameters of the energy storage system of hybrid electric train considering acceleration time,the highest speed that can be achieved and the highest speed that can be maintained steadily,which lays a foundation for the research of energy management strategy.(4)Based on fuzzy control,an energy management strategy based on single fuzzy controller and dual fuzzy controller is designed.In the energy management strategy based on dual fuzzy controllers,the charging and discharging phases of the hybrid train energy storage equipment are separately managed.The power battery output power in the hybrid train energy storage system is smoother,thereby prolonging the service life of the power battery.